JP5330106B2 - Oil and fat deterioration measuring device, method for manufacturing oil and fat deterioration measuring device, and method for managing deterioration state of oil and fat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for measuring degradation level of oil and fat, in which an optical system is miniaturized. <P>SOLUTION: The device for measuring degradation level of oil and fat 1 includes: an LED 20 as a light irradiation means for irradiating a light to a coloring unit SA which generates different coloring according to the degradation level of absorbed food oil; a light receiving element 26 as a first light receiving means for receiving the reflected light irradiated from the LED 20 and reflected from the coloring unit SA; a control unit 9 having a calculation unit for determining the degradation level of the food oil absorbed in the coloring unit SA based on the first comparing information as a predetermined information and the first measured information; and a display unit 7 as a display means unit for displaying the degradation level of the food oil determined by the calculation unit. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an oil and fat deterioration degree measuring apparatus, an oil and fat deterioration degree determination apparatus manufacturing method, and an oil and fat deterioration state management method.

  Fried cooking using edible oil, which is a kind of fats and oils, is widely used as a cooking method that allows simple and flavorful cooking. However, since fats and oils deteriorate due to heating, it is necessary to grasp the state of deterioration of edible oil using an appropriate index and replace it at an appropriate time. In deterioration of edible oil, phenomena such as thermal oxidation, thermal polymerization, thermal decomposition, and hydrolysis occur in a complex manner. As chemical indicators for judging the deterioration state of edible oil, there are various deterioration indicators such as an acid value, a carbonyl value, and an anisidine value. In the case of edible oil for business use (for example, prepared foods, school lunches, fried foods, etc.), replace it with new cooking oil according to the criteria of “acid value 2.5, carbonyl value 50, or smoke point 170 ° C.” according to the Ministry of Health, Labor and Welfare Guidance is being made. Above all, the acid value is an index that mainly captures the phenomenon of hydrolysis, and is a useful and general index for judging the deterioration state of edible oil. And from a practical aspect, in particular, there are many examples in which the degradation state of edible oil is grasped using the acid value as an index.

  However, special instruments and chemicals are required to measure the acid value. As a simple acid value measuring method, a test paper and an apparatus using a ph indicator have been devised. For example, the methods described in Patent Documents 1, 2, 3, 4, and 5 are simpler than measurements using actual titration, and are excellent because they can be determined at the frying cooking site. However, there is a problem that a little skill is required for the judgment and that individual differences occur. Furthermore, since a detailed acid value cannot be displayed as a measurement result, there exists a problem that an accurate judgment cannot be performed. On the other hand, Patent Document 6 discloses an apparatus that can capture a color state of a color object as imaging information, quantitatively measure the color state based on the imaging information, and display the result. According to such an apparatus, skill is not required for the determination of the coloration state, and individual differences do not occur. Further, the coloration state can be grasped quantitatively.

JP 56-60351 No. 2-52823 JP-A-62-63860 JP 52-32396 JP-A-6-94699 JP 2001-349834 A

  However, since the apparatus disclosed in Patent Document 6 is configured to compare a color sample as a reference provided on a single test paper with the coloration state of the color object to be determined, the color sample and the color sample are displayed. It is necessary to image color objects. That is, there is a problem that it is necessary to capture images over a wide range, the configuration of the optical system is increased, the momentum is increased, and the apparatus is also increased in size.

  Then, an object of this invention is to provide the fat-and-oil degradation degree measuring apparatus in which size reduction of the optical system was achieved.

  In order to solve the above-mentioned problems, the present invention comprises a light irradiation means for irradiating light to a colored body that reacts with fats and oils and produces a different color depending on the degree of deterioration of the fats and oils, and a light irradiation means. First light receiving means for receiving the reflected light that has been irradiated and reflected by the colored body, a calculation unit that determines the degree of deterioration of the oil based on predetermined information, and a degree of deterioration of the oil determined by the calculation unit A display means section for displaying, and the predetermined information includes predetermined first comparison information and first measurement information which is information based on the intensity of reflected light received by the first light receiving means. It is a device.

  The above-described oil and fat deterioration degree measuring apparatus includes second light receiving means for receiving light that is not reflected by the colored body out of light emitted from the light irradiation means, and the predetermined information is predetermined second comparison information. And second measurement information which is information based on the intensity of the light received by the first light receiving means and the intensity of the light received by the second light receiving means.

  In the above-described oil and fat deterioration degree measuring apparatus, a half mirror is arranged in the optical path of light emitted from the light irradiating means, and the first light receiving means is arranged on either the reflection side or the transmission side of the half mirror. In addition, the second light receiving means is disposed on the other side with respect to one side, and the optical axis of the light irradiated from the light irradiating means and incident on the color body is disposed perpendicular to the light reflecting surface of the color body. It is preferable that

  In the above-described oil and fat deterioration degree measuring apparatus, a reflecting mirror having a light passage hole is arranged in the optical path of light emitted from the light irradiating means, the first light receiving means is arranged with the reflecting mirror interposed therebetween, and the reflection of the reflecting mirror is also provided. It is preferable that the second light receiving means is disposed on the side, and the optical axis of the light emitted from the light irradiating means and incident on the color body is disposed perpendicular to the light reflecting surface of the color body.

  In the above-described oil and fat deterioration degree measuring apparatus, the light irradiating means is disposed in an oblique direction with respect to the light reflecting surface of the colored body, and the light irradiating means is disposed between the light emitting means and the light reflecting surface of the colored body. It is preferable that a refracting means for refracting the light irradiated from the side toward the light reflecting surface side of the colored body is disposed.

  The oil and fat deterioration degree measuring apparatus includes a condensing lens that collects light incident on the first light receiving unit reflected by the color forming unit between the color forming unit and the first light receiving unit. It is preferable that the light receiving surface of one light receiving means is disposed at a position shifted from the image forming position of the colored body by the condenser lens.

  In the above-described oil and fat deterioration degree measuring apparatus, it is preferable that a light diffusing means or a light uniformizing means is disposed between the color former and the first light receiving means.

  It is preferable that the above-described oil and fat deterioration degree measuring apparatus has a main body and a colored body mounting body on which the colored body is mounted, and the colored body mounting body is detachable from the main body.

  In the above-described oil and fat deterioration degree measuring apparatus, the colored body mounting body has a pedestal portion attached to the main body and a lid body that can be opened and closed with respect to the pedestal portion. It is preferable that a mounting portion on which the body is mounted is provided.

  In the above-described oil and fat deterioration degree measuring apparatus, the first comparison information and the second comparison information are preferably in the form of table data or an approximate expression.

  In the above-described oil / fat deterioration measuring device, the first comparison information and the second comparison information are preferably calibrated for each individual fat / oil deterioration measuring device.

  Based on the comparison result between the first measurement information and the first comparison information with respect to the color reference body indicating the reference color corresponding to the deterioration degree of the fat, the above-described oil and fat deterioration degree measuring device is based on the comparison result. It is preferable to have calibration means that can calibrate at least one of the intensity of light emitted from the light irradiation means and the output signal of the first light receiving means.

  Based on the comparison result between the second measurement information for the color reference body indicating the reference color corresponding to the degree of deterioration of the oil and the second comparison information, the above-described oil and fat deterioration degree measuring device is based on the comparison result. It is preferable to have calibration means capable of calibrating the second measurement information.

  In order to solve the above-described problem, the present invention provides a method of manufacturing the above-described oil / fat deterioration measuring apparatus, in which the first comparison information and the second comparison information indicate a reference color corresponding to the degree of deterioration of the oil / fat. Using the reference body, calibration shall be carried out for each individual fat / oil degradation measuring device.

  In order to solve the above-mentioned problems, the present invention manages the deterioration state of fats and oils using the above-described fat and oil deterioration degree measuring device or the fat and oil deterioration degree measuring device manufactured by the above manufacturing method.

  According to the present invention, it is possible to reduce the size of the optical system of the oil and fat deterioration degree measuring apparatus.

It is a perspective view which shows the external appearance of the fat-and-oil degradation degree measuring apparatus which concerns on embodiment of this invention. It is a figure which shows the general | schematic structure of the optical system incorporated in an oil-fat deterioration degree measuring apparatus. It is a figure which shows the state which removed the test paper mounting body from the fat-and-oil degradation degree measuring apparatus. It is a bottom view of the test paper mounting | wearing attached to a fat-and-oil degradation degree measuring apparatus. It is a figure which shows the state which the cover body of the test paper mounting | wearing attached to an oil-fat deterioration degree measuring apparatus opened. It is a figure which shows the table data as 1st comparison information preserve | saved at the control part of a fat-and-oil degradation degree measuring apparatus. The flowchart for demonstrating operation | movement of the fat-and-oil degradation degree measuring apparatus which calculates | requires the acid value of the edible oil of a test substance using the table data shown in FIG. FIG. 7 is a graph showing an example of a linear function for two specified light intensity information (L) and an acid value corresponding to the two light intensity information (L) obtained using the table data shown in FIG. 6. is there. It is a graph which shows the example of the spectral characteristic of the light reflected by the coloring part of a test paper. It is a graph which shows the reflectance of the light in a color value and an acid value about the predetermined | prescribed wavelength of the graph shown in FIG. The flowchart for creating the table data as 1st comparison information for every solid of a fats-and-oils degradation degree measuring apparatus is shown. The flowchart for demonstrating operation | movement of the fat and oil deterioration degree measuring apparatus which calculates | requires the acid value of the edible oil of a test substance using the approximate expression as 1st comparison information preserve | saved at the control part of an oil and fat deterioration degree measuring apparatus is shown. The flowchart for creating the approximate expression as 1st comparison information for every solid of a fats-and-oils degradation degree measuring apparatus is shown. It is a figure which shows the schematic structure of the other example of the optical system shown in FIG. It is a figure which shows the structure of the outline of the other example of the optical system incorporated in an oil-fat deterioration degree measuring apparatus. It is a figure which shows the table data as 2nd comparison information preserve | saved at the control part of a fat-and-oil degradation degree measuring apparatus. The flowchart for demonstrating operation | movement of the fat-and-oil degradation degree measuring apparatus which calculates | requires the acid value of the edible oil of a test substance using the table data shown in FIG. An example of a linear function for two specified light intensity ratio information (R) and an acid value corresponding to the two light intensity ratio information (R) obtained using the table data shown in FIG. 16 is shown. It is a graph. The flowchart for producing the table data as 2nd comparison information for every solid of a fats-and-oils degradation degree measuring apparatus is shown. The flowchart for demonstrating operation | movement of the fat and oil deterioration degree measuring apparatus which calculates | requires the acid value of the edible oil of a test substance using the approximate expression as 2nd comparison information preserve | saved at the control part of an oil and fat deterioration degree measuring apparatus is shown. The flowchart for creating the approximate expression as 2nd comparison information for every solid of a fats-and-oils degradation degree measuring apparatus is shown. It is a figure which shows the structure of the outline of the other example of the optical system incorporated in an oil-fat deterioration degree measuring apparatus. It is a figure which shows the structure of the outline of the other example of the optical system incorporated in an oil-fat deterioration degree measuring apparatus. It is a table | surface which shows a result when an acid value is measured using a fat-and-oil degradation degree measuring apparatus. It is a graph which shows the correlation with the measured value by the reference | standard oil-and-fat analysis test method of an acid value, and the judgment value by visual observation. It is a graph which shows the correlation with the actual value by the reference | standard oil-and-fat analysis test method of an acid value, and the measured value of a fat-and-oil degradation measuring device.

(First embodiment)
The acid value of edible oil is generally measured using an acid value determination test paper (hereinafter simply referred to as test paper). This test paper is such that when the edible oil of the specimen is absorbed in the colored portion, the colored portion exhibits a color corresponding to the acid value of the edible oil. Then, the acid value is measured using the test paper, and the measurer visually compares the coloration state of the coloration portion with a color tone table (color sample) for comparison. A color tone portion close to the color tone state is specified, and an acid value corresponding to the color tone portion is used as a measurement value. However, the above-described measurement of the acid value, which is performed by comparing the coloring state of the colored portion with the color tone table for comparison, is based on the visual sense of the measurer and must be a sensual decision.

  By the way, as described above, the colored portion of the test paper exhibits a different color depending on the acid value of the edible oil absorbed by the colored portion. Therefore, when light is applied to the colored portion of the test paper, the intensity of the light reflected by the colored portion varies depending on the colored state of the colored portion. That is, the intensity of light irradiated to the colored portion and reflected by the colored portion corresponds to the colored state (acid value). Therefore, the oil / fat deterioration measuring apparatus 1 shown in the present embodiment measures the intensity of light irradiated to the colored portion and reflected by the colored portion, and the acid of the edible oil is based on the measured light intensity. The acid value is obtained and the acid value can be displayed as the degree of deterioration of the edible oil.

(About acid value)
Before describing the specific configuration of the oil and fat deterioration degree measuring apparatus 1, the acid value will be briefly described. The acid value is one of indexes indicating the amount of fatty acid generated when the oil deteriorates. Edible oil undergoes hydrolysis due to thermal oxidation and moisture during heating such as frying, and produces free fatty acids. The value obtained by measuring the amount of fatty acids by a prescribed method is the acid value. The acid value is defined as “the number of milligrams of potassium hydroxide required to neutralize free fatty acids contained in 1 g of fats and oils” (“Glossary of fats and oils (edited by Japan Oil Chemistry Association)”). Dissolve the sample in water and titrate with potassium hydroxide using phenolphthalein as an indicator to determine the end point (“Oil and Fat Terminology (edited by Japan Oil Chemistry Association)”). There is a method described in Test Method 2.3.1-1996.

  Further, as a method for simply measuring the acid value, there is a method using a test paper (acid value determination test paper). The test paper is obtained by applying and fixing a plurality of drugs on a carrier mainly composed of paper or resin. This test paper has a titration state due to the alkali adhering to the oil adhering to and adsorbed to the test paper, and at the same time, a reaction of coloring with an indicator occurs, and the acid value is judged by the coloration state. It is something that can be done. The test paper used for the fat and oil deterioration degree measuring apparatus 1 can be used as long as the specified color reaction and the specified acid value correspond, and the reaction mechanism is not particularly limited, The above method is more desirable. In addition, the range of the acid value is preferably about 0 to 5 which is generally assumed to be used, but is not limited thereto.

(About the whole structure of the fat-and-oil degradation degree measuring apparatus 1)
Next, the overall configuration of the oil and fat deterioration degree measuring apparatus 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view showing the appearance of the oil and fat deterioration degree measuring apparatus 1. FIG. 2 is a diagram showing the configuration of the optical system 2 arranged inside the oil and fat deterioration degree measuring apparatus 1. FIG. 3 is a view showing a state in which the test paper mounting body 3 is detached from the oil and fat deterioration degree measuring apparatus 1. FIG. 4 is a perspective view of the test paper mounting body 3 viewed from the bottom side. FIG. 5 is a view showing a state in which the lid 4 of the test paper mounting body 3 is opened. In the following description, the arrow X1 direction is the left direction, the X2 direction is the right direction, the Y1 direction is the upper direction, the Y2 direction is the lower direction, the Z1 direction is the front, and the Z2 direction is the rear.

  As shown in FIG. 1, the oil and fat deterioration measuring apparatus 1 includes a main body 5 and a test paper mounting body 3 as a colored body mounting body. The oil and fat deterioration degree measuring device 1 has a rectangular parallelepiped that is long in the vertical direction as a whole, and is configured to have a size that can be gripped and handled by a palm. A panel surface 6 which is the front surface (front surface) of the main body 5 is provided with a display unit 7 for displaying the acid value and the like of the measured edible oil, and an operation unit 8 provided with various operation buttons. In addition to the optical system 2 shown in FIG. 2 being disposed inside the main body 5, a control unit 9 (see FIG. 2) for performing the operation and control of the oil / fat deterioration measuring apparatus 1 and the oil / fat deterioration measuring apparatus. A battery (not shown) for operating 1 is disposed. The control unit 9 includes a CPU, various memories, a calculation unit, a driver for the display unit 7, a power supply circuit, and the like.

  As shown in FIGS. 1 and 3, the oil and fat deterioration degree measuring apparatus 1 is configured so that the test paper mounting body 3 can be attached to and detached from the main body 5. The test paper mount 3 includes a pedestal 10 that is held with respect to the main body 5, a storage 11 that stores the test paper S (see FIG. 5), and a lid 4 that is opened and closed with respect to the storage 11. Have.

  Grooves 12, 12 extending in the front-rear direction are provided on the left and right edges of the upper surface 16 of the main body 5. On the other hand, on the left and right sides of the lower surface of the pedestal portion 10, as shown in FIG. 4, ridge portions 13 and 13 that can be fitted into the groove portions 12 and 12 of the main body 5 are provided. Openings 12A and 12A are formed at the front ends of the grooves 12 and 12, respectively. And the protruding strips 13 and 13 of the base 10 can be inserted into the grooves 12 and 12 through the openings 12A and 12A. That is, the test paper mounting body 3 is attached to the main body 5 by fitting the ridges 13 and 13 of the pedestal 10 to the grooves 12 and 12. Conversely, the test paper mounting body 3 can be removed from the main body 5 by releasing the fitting between the groove portions 12 and 12 and the ridge portions 13 and 13.

  As shown in FIG. 4, a claw portion 14 is provided on the lower surface of the pedestal portion 10. The claw portion 14 is supported on the lower surface of the pedestal portion 10 by a support portion 15 having elasticity in the vertical direction. On the other hand, a recess 17 is provided on the upper surface 16 of the main body 5. When the test paper mounting body 3 is attached to the main body 5, the claw portion 14 and the recess 17 are engaged with each other, and the test paper mounting body 3 is fixed to the main body 5 by this engagement. The claw part 14 can be displaced in the vertical direction by the support part 15. Therefore, when the test paper loaded body 3 is attached to or detached from the main body 5, the claw portion 14 can be brought into contact with the upper surface 16 of the main body 5 and displaced upward.

  As shown in FIG. 5, the accommodating portion 11 is formed in the upper portion of the pedestal portion 10 as a concave portion that opens upward. A window 18 is provided at the bottom of the housing 11. A transparent resin plate is fitted in the window portion 18. A window portion 19 is also formed on the upper surface 16 of the main body 5 (see FIG. 3). The window portion 18 and the window portion 19 are arranged at positions facing each other in the vertical direction in a state where the test paper mounting body 3 is mounted on the main body 5. Similarly to the window portion 18, the window portion 19 is fitted with a transparent resin plate. Further, the window 18 and the window 19 can receive light irradiated from an LED (light emitting diode) 20 (see FIG. 2) described later in a state where the test paper mounting body 3 is mounted on the main body 5. Placed in position.

  As shown in FIGS. 1 and 5, the lid 4 is rotatably supported with respect to the test paper mounting body 3 at the rear edge 3 </ b> A of the test paper mounting body 3. As shown in FIG. 5, it can be opened and closed between the closed state and the state in which the container 11 is opened by rotating approximately 90 degrees with respect to the upper surface 21 of the test paper mounting body 3. The test paper mount 3 has a stopper (not shown) that prevents the cover 4 from rotating further when the cover 4 is rotated 90 degrees with respect to the upper surface 21 of the test paper mount 3. Is omitted). Therefore, even when the oil and fat deterioration measuring device 1 is arranged so that the panel surface 6 of the oil and fat deterioration measuring device 1 is horizontal with the cover 4 opened, the lid on the upper surface 21 of the test paper mounting body 3 is also provided. The opening angle of the body 4 can be maintained at 90 degrees.

  A mounting portion 22 to which the test paper S is mounted is provided inside the lid body 4. The test paper S is mounted on the mounting portion 22 in such a direction that the colored portion SA does not face the back surface 23 of the lid 4. The mounting portion 22 includes a positioning projection 24 and two pieces 25 and 25 arranged on the left and right. The lower portions (lower portions when the lid body 4 is opened approximately 90 degrees) of the pieces 25 and 25 are attached to the lid body 4. On the other hand, the pieces 25, 25 have a distance D between the back surface 23 of the lid body 4 except for the portion attached to the lid body 4. Therefore, the test paper S is inserted between the pieces 25, 25 and the lid body 4 by inserting the picking allowance SB of the test paper S into the interval D formed between the pieces 25, 25 and the lid body 4. Can be pinched.

  When the picking allowance SB of the test paper S is inserted into the intervals D and D, the edge SC of the picking allowance SB abuts the attachment portion of the piece portions 25 and 25 with the cover 4 and the front and rear direction of the cover 4 (cover The test paper S is positioned in the front-rear direction in the state where 4 is closed. In addition, the left end portion of the test paper S, that is, the leading end portion of the coloring portion SA is brought into contact with the step portion 24A formed on the right side of the positioning protrusion 24 in a state where the picking allowance SB is sandwiched between the intervals D and D. Thus, the test paper S can be positioned in the left-right direction of the lid 4. In other words, the test paper S is attached to the attachment portion 22 of the lid body 4, whereby the test pieces S are attached in the front-rear direction (the lid body 4 is closed) by the attachment portions of the pieces 25, 25 to the lid body 4 and the positioning protrusions 24. In the front-rear direction) and the left-right direction. This predetermined position is set so that the colored portion SA of the test paper S can face the window 18 when the lid 4 on which the test paper S is mounted is closed.

  As described above, the oil and fat deterioration degree measuring apparatus 1 includes the main body 5 and the test paper mounting body 3 as the color body mounting body, and the test paper mounting body 3 is configured to be detachable from the main body 5. ing. By configuring the oil / fat deterioration measuring apparatus 1 in this manner, when the test paper mounting body 3 is soiled with oil or the like, the dirty test paper mounting body 3 is easily replaced with a new test paper mounting body 3. be able to.

  In addition, the oil and fat deterioration degree measuring apparatus 1 includes a pedestal portion 10 attached to the main body 5 and a lid 4 that can be opened and closed with respect to the pedestal portion 10. A mounting portion 22 to which is mounted is provided. By configuring the oil / fat deterioration degree measuring apparatus 1 in this way, edible oil is attached to the colored portion SA of the test paper S in a state where the test paper S is mounted on the mounting portion 22 provided on the lid 4. be able to. That is, when the test paper S is mounted on the mounting unit 22, the test paper S to which edible oil is not attached can be mounted. On the other hand, when the test paper S to which edible oil is attached is attached to the oil / fat deterioration measuring device 1, it is necessary to pay attention so that the edible oil does not adhere to the fingers or the oil / oil deterioration measuring device 1. However, edible oil can be attached to the colored portion SA of the test paper S in a state of being mounted on the mounting portion 22, so that it is not necessary to pay such attention.

  Moreover, in the oil-and-fat deterioration measuring apparatus 1, when the lid 4 is rotated 90 degrees with respect to the housing portion 11 (with respect to the upper surface 21 of the test paper mounting body 3), the lid 4 is prevented from rotating further. A stopper (not shown) for preventing the body 4 from rotating is provided. Therefore, even when the oil and fat deterioration degree measuring device 1 is arranged so that the panel surface 6 of the oil and fat deterioration degree measuring device 1 is horizontal in a state where the cover body 4 is opened, the opening angle of the lid body 4 with respect to the accommodating portion 11 Can be held at 90 degrees. Therefore, when the main body 5 is gripped by the palm with the front surface of the main body 5 being substantially horizontal, the mounting portion 22 of the lid 4 is also substantially horizontal. Therefore, it is easy to perform the operation of attaching edible oil to the test paper S mounted on the mounting unit 22.

(Configuration of optical system 2)
Next, the configuration of the optical system 2 will be described with reference to FIG. The optical system 2 includes an LED 20 as a light irradiation unit, a light receiving element 26 as a first light receiving unit, and a condenser lens 27. The optical system 2 is disposed below the window portion 19. In this Embodiment, white LED which irradiates white light can be used for LED20, for example. For the light receiving element 26, for example, a photodiode can be used. As the light receiving element 26, for example, a photo IC, a CCD, or the like can be used.

  FIG. 2 shows a state in which the test paper S is mounted on the mounting portion 22 of the lid 4 and the lid 4 is closed. In the state in which the lid 4 is closed, the color portion SA of the test paper S attached to the attachment portion 22 is disposed above the window portion 19 and the window portion 18. The LED 20 can irradiate the colored portion SA with light through the window portion 19 and the window portion 18. The light emitted from the LED 20 and incident on the colored portion SA is reflected by the colored portion SA. A part of the light reflected by the color forming part SA passes through the window part 18 and the window part 19, is condensed by the condenser lens 27, and enters the light receiving element 26. When the light reflected by the colored portion SA enters the light receiving element 26, the light receiving element 26 outputs a current having a magnitude corresponding to the intensity of the received light. In addition, although the light which permeate | transmits the window part 18 and the window part 19 permeate | transmits the transparent resin board fitted to the window parts 18 and 19, the resin board is colorless and transparent, and when passing through the window parts 19 and 18, There is little loss of light.

  As described above, the colored portion SA indicates a colored state (color tone) corresponding to the acid value of the edible oil of the specimen absorbed in the colored portion SA. For this reason, the intensity of light reflected by the colored portion SA varies depending on the colored state of the colored portion SA. That is, the magnitude of the current output from the light receiving element 26 differs depending on the coloration state of the coloration unit SA. Information on the magnitude of the output current is input to the control unit 9 as first measurement information. The control unit 9 obtains the acid value of the edible oil of the specimen based on the first measurement information and first comparison information described later, and displays this acid value on the display unit 7. Therefore, the degree of acid value of the edible oil of the sample can be quantitatively known from the acid value displayed on the display unit 7.

  Strictly speaking, the acid value is one of indices indicating the amount of fatty acid generated when oil deteriorates, as described above. On the other hand, in the fat and oil deterioration degree measuring apparatus 1, the amount of fatty acid is not directly measured. Therefore, the value (acid value) displayed on the display unit 7 is different from the acid value in a strict sense. The fat and oil deterioration degree measuring apparatus 1 obtains an acid value equivalent value that is a value corresponding to an acid value (a strict acid value) based on the coloration state of the colored portion SA, and calculates the acid value equivalent value. It is displayed on the display unit 7.

(About the first comparison information)
The first comparison information will be described. The first comparison information includes the intensity of the light irradiated from the LED 20 and reflected by the colored portion SA and received by the light receiving element 26, and the colored state of the colored portion SA (acid value of the edible oil of the specimen). Is the information that corresponds to. As described above, the acid value of the edible oil absorbed in the colored portion SA corresponds to the colored state of the colored portion SA. Therefore, if the intensity of the light emitted from the LED 20 to the colored portion SA is constant, the intensity of the light reflected by the colored portion SA and received by the light receiving element 26 is the coloration state (specimen) of the colored portion SA. Corresponding to the acid value of edible oil.

  Therefore, the intensity of the light irradiated from the LED 20 and reflected by the colored portion SA and received by the light receiving element 26 is examined in advance for each colored state (acid value of edible oil). For example, as shown in FIG. 6, the table data in which the acid value (A.V) is associated with the light intensity information (L) that is information based on the intensity of the light received by the light receiving element 26 is One comparison information is stored in advance in the memory of the control unit 9. The light intensity information (L) of the table data shown in FIG. 6 is shown as a value obtained by A / D converting the intensity of light received by the light receiving element 26. The colored portion SA of the test paper S is generally set so that the brightness of the colored state increases from the lower acid value side to the higher side. Therefore, the light intensity information (L) of the table data shown in FIG. 6 increases as the acid value increases.

  The control unit 9 refers to the table data (first comparison information) to determine the intensity of the light received by the light receiving element 26 for the colored portion SA in which the edible oil (specimen) whose acid value is to be measured is absorbed. The acid value of the edible oil is obtained based on the first measurement information that is information based on the information. Then, the control unit 9 displays the acid value of the specimen determined as described above on the display unit 7.

(Calculation of acid value using table data)
Specifically, in the oil and fat deterioration degree measuring apparatus 1, for example, the acid value is obtained according to the flowchart shown in FIG.

  First, the measurement provided in the operation unit 8 in a state where the test paper S is mounted on the oil / fat deterioration measuring apparatus 1, that is, in a state where the test paper S is mounted on the mounting portion 22 of the lid 4 and the lid 4 is closed. Press a button (not shown). When the measurement button is pressed, the LED 20 emits light, and this light is reflected by the colored portion SA and received by the light receiving element 26 (step S10). The measured light intensity is A / D converted and stored as digital data in a memory in the control unit 9 (step S20). The light intensity measurement (step S10) is repeated a plurality of times, for example, 10 times, and data relating to the light intensity for each measurement is stored in the memory one by one (step S20). That is, it is determined whether the measurement of the light intensity (step S10) and the storage of the data relating to the light intensity in the memory (step S20) have been performed a predetermined number of times (step S30), and until the predetermined number of times has been performed, step S10, Step S20 is repeated.

  And the average value of the data preserve | saved at memory is calculated as 1st measurement information (step S40). Here, the measurement of the light intensity (step S10) is repeated a plurality of times, and the average value of the data of the measurement results is used as the first measurement information. However, the measurement of the light intensity is not limited to a plurality of times and is performed once. Data regarding one light intensity may be used as the first measurement information.

  Next, the first measurement information and the first comparison information (table data) are compared, and two pieces of light intensity information (L) that sandwiches the first measurement information most recently from the light intensity information (L) in the first comparison information. L) and acid values corresponding to the two light intensity information (L) are specified based on the table data shown in FIG. 6 (step S50). Specifically, for example, it is assumed that the calculated first measurement information is 140, for example. In this case, in the table data of FIG. 6, the two light intensity information (L) sandwiching the first measurement information most recently are 130 and 150, and the acid corresponding to the two light intensity information (L) 130 and 150 The values are 1.0 and 2.0, respectively.

  Subsequently, a linear function for the two specified light intensity information (L) and the acid value corresponding to the two light intensity information (L) is obtained (step S60). Specifically, for example, as described above, when the first measurement information is 140, the two pieces of light intensity information (L) sandwiching the first measurement information are 130 and 150, and the two pieces of light intensity information. Since the acid values corresponding to (L) 130 and 150 are 1.0 and 2.0, respectively, the linear function is represented in the graph shown in FIG. That is, the control unit 9 obtains a linear function K1 corresponding to this graph. Then, based on this linear function K1, an acid value corresponding to the calculated first measurement information is obtained, and this acid value is displayed on the display unit 7 (step S70).

  The data acquired as the first comparison information is discrete data. That is, it is the light intensity information (L) with respect to discrete acid values (in this embodiment, 0, 0.5, 1.0, 2.0, 3.0, 4.0). However, by obtaining a linear function as described above and using this linear function, the acid value can be obtained even for a portion where there is no data (between data and data). In particular, in the present embodiment, a linear function is obtained using two pieces of light intensity information (L) sandwiching the measured first measurement information most recently and an acid value corresponding thereto. That is, by obtaining a linear function that approximates a narrow range of data compared to obtaining a linear function that approximates all the data of the first comparison information, the acid value and light characteristic of this linear function are obtained. The correspondence with the intensity information (L) can be made highly accurate.

  By the way, the intensity of the light emitted from the LED 20 and reflected by the colored portion SA varies depending on the wavelength. Therefore, the light intensity information (L) and the first measurement information are for light having a wavelength at which the change in the coloration state of the coloration part SA appears as large as possible as the difference in the intensity of the light reflected by the coloration part SA. It is preferable that In the present embodiment, the linear function K1 is obtained, and the acid value is obtained based on the linear function K1. For this reason, a wavelength in which the coloration state (acid value) and the change in light intensity reflected by the colored portion SA are as linear as possible is selected, and light intensity information (L) is set for the light of this wavelength. In addition, it is preferable to measure the first measurement information.

  For example, when the spectral characteristics of the light reflected by the colored portion SA are as shown in FIG. 9, the acid value (AV) for the wavelength of 630 nm and the reflectance of the light at the colored portion SA are: As shown in FIG. 10, the difference in reflectance is a relationship that approximates a linear function that clearly appears in the difference in acid value. Therefore, when the spectral characteristics of the light reflected by the colored portion SA are as shown in FIG. 9, it is possible to set the first comparison information and measure the first measurement information for the wavelength of 630 nm. preferable.

(Second Embodiment)
(Create first comparison information for each individual)
By the way, it is preferable from the point of the man-hour at the time of manufacture that the above-mentioned 1st comparison information (table data) uses the same data irrespective of the individual of the fat and oil degradation degree measuring apparatus 1. As the first comparison information in this case, information prepared by selecting one oil-fat deterioration measuring device 1 as a reference machine and using this reference machine can be used. However, when there are individual differences in the members constituting the oil / fat deterioration measuring apparatus 1, for example, the LED 20, the condensing lens 27, the light receiving element 26, etc., even if the coloring state of the coloring portion SA is the same. The magnitude of the output current output from the light receiving element 26 may be different.

  Therefore, in the manufacturing process of the fat / oil deterioration measuring apparatus 1, first comparison information is created for each individual of the fat / oil deterioration measuring apparatus 1, and each individual holds its own first comparison information (control unit 9). It is also possible to save the data in the memory. Thereby, even if it is a case where the member which comprises the fats and oils degradation degree measuring apparatus 1 has an individual difference, an acid value with high precision can be measured.

  The creation of the first comparison information for each solid of the oil / fat deterioration measuring device 1 is performed when all members are incorporated in the oil / fat deterioration measuring device 1 and the arrangement of the optical system 2 and the mounting position of the test paper S are determined. Preferably it is done. The creation of the first comparison information for each individual of the fat and oil deterioration degree measuring apparatus 1 can be created, for example, according to the flowchart shown in FIG.

  The flowchart shown in FIG. 11 can be realized, for example, by connecting the fat / oil deterioration degree measuring apparatus 1 to a personal computer for creating first comparison information and executing a program for creating first comparison information provided in the personal computer. . That is, by performing predetermined processing by the personal computer, the first comparison information about the fat / oil deterioration measuring device 1 is obtained, and the obtained first comparison information is stored in the memory of the fat / oil deterioration measuring device 1. Will be.

  In creating the first comparison information, a test paper for creating first comparison information in which a color sample exhibiting a color tone corresponding to a predetermined acid value is provided in advance in a portion corresponding to the color portion SA of the test paper S ( Hereinafter, it is referred to as a master test paper). For example, colors exhibiting color tones corresponding to six acid values of acid values “0”, “0.5”, “1.0”, “2.0”, “3.0”, and “4.0”, respectively. Six master test papers having a sample in the colored portion SA are prepared. Then, according to the flowchart shown in FIG. 11, the light intensity information (L) of the fat / oil deterioration measuring device 1 is measured for the master test paper corresponding to each acid value, and the light intensity information (L) and the acid value are obtained. Corresponding table data is created as first comparison information. And the produced 1st comparison information is memorize | stored in the memory with which the fat and oil degradation degree measuring apparatus 1 is equipped.

  Prior to the creation of the first comparison information, a master test paper having an acid value of “0” is attached to the oil / fat deterioration measuring apparatus 1 for which the first comparison information is to be obtained. And the process demonstrated below is performed by a personal computer in the state in which the master test paper was mounted in the fat and oil deterioration degree measuring apparatus 1.

  In the processing of the personal computer, first, the color portion SA is irradiated with light from the LED 20, and the light intensity of the light reflected by the color portion SA having the color tone corresponding to the acid value “0” and received by the light receiving element 26. Is measured (step S110). Then, the data obtained by A / D converting the measured light intensity is stored in an external memory provided in a personal computer or the like (step S120). The light intensity measurement (step S110) is repeated a plurality of times, for example, 10 times, and data relating to the light intensity for each measurement is stored in the external memory one by one (step S120). That is, it is determined whether the measurement of the light intensity (step S110) and the storage of the data relating to the light intensity in the external memory (step S120) have been performed a predetermined number of times (step S130), and step S110 is performed until the predetermined number of times has been performed. Step S120 is repeated. The light intensity measurement (step S110) is not limited to a plurality of times, and may be performed once.

  Next, the average value of the data stored in the external memory is calculated as light intensity information (L) (step S140). Then, the light intensity information (L) and the acid value “0” are stored as one record of the table data in a memory provided in the fat and oil deterioration measuring apparatus 1 (step S150). Then, it is determined whether or not the light intensity information (L) has been acquired for the master test papers of all color samples (step S160).

  If the light intensity information (L) has not been acquired for all the color sample master test papers (No in step S160), a notification for instructing mounting of the master test papers of other acid values on the mounting unit 22 Is performed (step S170). This notification is performed by, for example, displaying on a personal computer monitor. When another acid value master test paper is mounted on the mounting unit 22, the processes from step S110 to step S150 described above are repeated. On the other hand, when the light intensity information (L) has been acquired for all the color sample master test papers (Yes in step S160), the completion of the creation of the first comparison information is notified (displayed on a monitor of a personal computer or the like) ( Step S180). In this way, light corresponding to each of the six acid values of acid values “0”, “0.5”, “1.0”, “2.0”, “3.0”, “4.0” Table data having six records having strength information (L) is created and stored in a memory provided in the fat and oil deterioration degree measuring apparatus 1.

  Thus, the 1st comparison information which has the light intensity information (L) measured by the individual itself for every individual | organism | solid of the fat-and-oil degradation measuring apparatus 1 is produced, and this individual | organism | solid which measured this 1st comparison information is made to hold | maintain. Thus, even when there are individual differences in the members constituting the oil and fat deterioration degree measuring apparatus 1, it is possible to measure the acid value with high accuracy. In addition, you may give the function which can perform the process of above-mentioned step S110 to step S180 to the fat-and-oil degradation degree measuring apparatus 1 itself. Further, a part or all of steps S110 to S180 may be performed by a human.

(Third embodiment)
(Other forms of first comparison information)
As described above, the first comparison information can be created in the form of table data, and can also be created in the form of an approximate expression as described below. As described above, the colored portion SA of the test paper S is set so that the brightness of the colored state increases from the low acid value side to the high color side. For this reason, the relationship between the acid value and the intensity of the light reflected by the colored part SA can be handled by approximating it to a predetermined function by appropriately selecting the wavelength of the light reflected by the colored part SA. it can. That is, an approximate expression indicating the relationship between the acid value and the intensity of the light reflected by the colored portion SA is obtained in advance, and the acid value can be obtained based on this approximate expression.

The approximate expression is represented, for example, in the form of Y = A _K X ^K +... + A ₁ X + A ₀ . Y is an acid value, and X is first measurement information. A 0 _... A _K is a factor for causing hold the relationship between the intensity and the acid value of the light reflected by the Teiirobu SA in approximation. Instead of the table data, the coefficients (A ₀ ... A _K ) of this approximate expression are stored in the memory, and the measured first measurement information (X) and the coefficients (A ₀ ... A _K stored in the memory are stored. ), An approximate expression may be created, and the acid value (Y) may be obtained based on the approximate expression.

(Calculation of acid value using approximate equation)
Specifically, in the oil and fat deterioration degree measuring apparatus 1, for example, according to the flowchart shown in FIG. 12, the acid value is obtained using an approximate expression.

  First, the measurement provided in the operation unit 8 in a state where the test paper S is mounted on the oil / fat deterioration measuring apparatus 1, that is, in a state where the test paper S is mounted on the mounting portion 22 of the lid 4 and the lid 4 is closed. Press a button (not shown). When the measurement button is pressed, the LED 20 emits light, and this light is reflected by the colored portion SA and received by the light receiving element 26, and the light intensity is measured (step S210). The measured light intensity is A / D converted and stored as digital data in a memory in the control unit 9 (step S220). The light intensity measurement (step S210) is repeated, for example, 10 times, and the data regarding the light intensity for each measurement is stored in the memory one by one (step S220). That is, it is determined whether the measurement of the light intensity (step S210) and the storage of the data relating to the light intensity in the memory (step S220) are performed a predetermined number of times (step S230), and until the predetermined number of times is performed, step S210, Step S220 is repeated.

  And the average value of the data preserve | saved at memory is calculated as 1st measurement information (step S240). Here, the measurement of the light intensity (step S210) is repeated a plurality of times, and the average value of the data of the measurement results is used as the first measurement information. However, the measurement of the light intensity is not limited to a plurality of times and is performed once. Data regarding one light intensity may be used as the first measurement information.

Next, an approximate expression is created using the coefficients (A ₀ ... A _K ) of the approximate expression stored in advance in the memory (step S250). Then, the first measurement information is substituted into the created approximate expression, the acid value is calculated, and this acid value is displayed on the display unit 7 (step S260).

(Fourth embodiment)
(Create an approximate expression for each individual)
By the way, the coefficient for the above approximate expression (Y = A _K X ^K +... + A ₁ X + A ₀ ) can be used at the time of manufacture regardless of the individual of the oil / fat deterioration measuring apparatus 1. It is preferable from the point of man-hour. As the approximate expression in this case, an oil and fat deterioration degree measuring device 1 selected as a reference machine and the one created using this reference machine can be used. However, when there are individual differences in the members constituting the oil / fat deterioration measuring apparatus 1, for example, the LED 20, the condensing lens 27, the light receiving element 26, etc., even if the coloring state of the coloring portion SA is the same. The magnitude of the output current output from the light receiving element 26 may be different.

Therefore, in the manufacturing process of the fat / oil deterioration measuring apparatus 1, an approximate expression is created for each individual fat / oil deterioration measuring apparatus 1, and the coefficient (A ₀ ... A _K ) of the own approximate expression is held in each individual. (Save in memory). Thereby, even if it is a case where the member which comprises the fats and oils degradation degree measuring apparatus 1 has an individual difference, an acid value with high precision can be measured.

  Preparation of the approximate expression for each solid of the oil / fat deterioration measuring device 1 is performed when all members are incorporated in the oil / fat deterioration measuring device 1 and the arrangement of the optical system 2 and the mounting position of the test paper S are determined. Is preferred. The approximate expression for each individual of the fat and oil deterioration degree measuring apparatus 1 can be created, for example, according to the flowchart shown in FIG.

  In the flowchart shown in FIG. 13, for example, the oil and fat deterioration degree measuring apparatus 1 is connected to a personal computer for creating approximate expressions as first comparison information, and a program for creating first comparison information (approximate expressions) provided in the personal computer is executed. This can be achieved. That is, by performing a predetermined process with this personal computer, an approximate expression for the oil and fat deterioration measuring device 1 is obtained, and the coefficient of the obtained approximate expression is stored in the memory of the oil and fat deterioration measuring device 1. become.

  In preparing the approximate expression, for example, six acids having an acid value of “0”, “0.5”, “1.0”, “2.0”, “3.0”, “4.0” are used in advance. Six master test papers having a color sample exhibiting a color tone corresponding to each price are prepared in the coloring portion SA. And according to the flowchart shown in FIG. 13, about the master test paper corresponding to each acid value, the light intensity information (L) of the fat-and-oil degradation measuring device 1 is measured, and this light intensity information (L) and the acid value An approximate expression representing the relationship is created as first comparison information. Then, the created first comparison information (approximate expression) is stored in a memory provided in the oil and fat deterioration degree measuring apparatus 1.

  Prior to the creation of the approximate expression, a master test paper having an acid value of “0” is attached to the oil / fat deterioration measuring apparatus 1 for which an approximate expression is to be obtained. And the process demonstrated below is performed by a personal computer in the state in which the master test paper was mounted in the fat and oil deterioration degree measuring apparatus 1.

  In the processing of the personal computer, first, the color portion SA is irradiated with light from the LED 20, and the light intensity of the light reflected by the color portion SA having the color tone corresponding to the acid value “0” and received by the light receiving element 26. Is measured (step S310). Then, data obtained by A / D converting the measured light intensity is stored in an external memory provided in a personal computer or the like (step S320). The light intensity measurement (step S310) is repeated a plurality of times, for example, 10 times, and data relating to the light intensity for each measurement is stored in the external memory one by one (step S320). That is, it is determined whether the measurement of the light intensity (step S310) and the storage of the data related to the light intensity in the memory (step S320) have been performed a predetermined number of times (step S330), and until the predetermined number of times has been performed, step S310, Step S320 is repeated. Note that the measurement of the light intensity (step S310) is not limited to a plurality of times and may be performed once.

  Next, the average value of the data stored in the external memory is calculated as light intensity information (L), and the light intensity information (L) is stored in the external memory (step S340). Then, it is determined whether or not the light intensity information (L) has been acquired for the master test papers of all color samples (step S350).

  When the light intensity information (L) has not been acquired for all the color sample master test papers (No in step S350), a notification instructing that the master test papers of other acid values be mounted on the mounting unit 22 Is performed, for example, by display on a monitor of a personal computer (step S360). When another acid value master test paper is attached to the attachment unit 22, the processing from step S310 to step S340 described above is repeated. On the other hand, when the light intensity information (L) is acquired for the master test papers of all the color samples (Yes in step S350), the light intensity information about the master test paper of each color sample stored in the external memory ( L), an approximate expression is obtained (step S370).

  Here, since the light intensity information (L) is obtained for each of the six master test papers, an approximate expression is obtained from the six light intensity information (L). That is, an approximate expression of a quintic function is obtained at the maximum. It is assumed that the light wavelength for measuring the light intensity is selected to be able to measure the six light intensity information (L) for which the approximate expression is not indefinite. Subsequently, the obtained coefficient of the approximate expression is stored in a memory provided in the fat / oil deterioration degree measuring apparatus 1 (step S380).

Thus, for each individual of the fat and oil degradation degree measuring apparatus 1, an approximate expression measured by the individual is created, and the coefficient of the approximate expression is held in the individual itself, so that the fat and oil deterioration degree measuring apparatus 1 is Even when there are individual differences in the constituent members, a highly accurate acid value can be measured. In addition, you may give the function which can perform the process of above-mentioned step S310 to step S380 to the fat-and-oil degradation degree measuring apparatus 1 itself. In addition, a part or all of steps S310 to S380 may be performed by a human.

(Fifth embodiment)
(Calibration of the oil / fat deterioration measuring apparatus 1)
By the way, as for the fat and oil deterioration measuring apparatus 1, LED20, the light receiving element 26 grade | etc., Deteriorates by use for many years, for example. Therefore, the measurement accuracy of the oil and fat deterioration degree measuring apparatus 1 may change over time. For example, even when the coloration state of the coloration portion SA is the same, the acid value measured when the oil and fat deterioration measuring device 1 is new may be different from the acid value measured when used for many years.

  Therefore, the light emission intensity of the LED 20 or the gain of the signal output from the light receiving element 26 is set so that the intensity of the light received by the light receiving element 26 becomes a predetermined intensity corresponding to the coloration state of the coloring portion SA. Calibration means for calibrating may be provided. Specifically, the measurement is performed on the master test paper as the color reference body, and the light emission intensity of the LED 20 or the output gain of the light receiving element 26 is displayed so that the acid value corresponding to the master test paper is displayed on the display unit 7. An adjustment volume capable of adjusting at least one of them is provided, and the control unit 9 is configured to calibrate the light emission intensity of the LED 20 or the output gain of the light receiving element 26 according to the setting of the adjustment volume. By calibrating the light emission intensity of the LED 20 or the output gain of the light receiving element 26, the acid value measurement accuracy can be made normal even when the LED 20, the light receiving element 26, etc. deteriorate.

  As described above, the fat and oil deterioration degree measuring apparatus 1 includes the LED 20 as a light irradiation unit that irradiates light to the colored portion SA that generates different color depending on the degree of deterioration of the absorbed edible oil, and the LED 20. Is applied to the colored portion SA based on the light receiving element 26 as the first light receiving means for receiving the reflected light reflected from the colored portion SA and the first comparison information and the first measurement information as predetermined information. A control unit 9 having a calculation unit for determining the degree of deterioration of the absorbed edible oil and a display unit 7 as a display means unit for displaying the degree of deterioration of the edible oil determined by the calculation unit are provided. By configuring the oil / fat deterioration measuring apparatus 1 in this manner, it is not necessary to provide the test paper S with a color sample to be compared with the coloring of the coloring portion SA, and therefore the optical system 2 can be downsized.

  Further, in the fat and oil deterioration degree measuring apparatus 1, the first comparison information is held in the form of table data or an approximate expression. By holding the first comparison information in the form of table data or in the form of an approximate expression, it is possible to easily determine the acid value corresponding to the coloring state of the coloring portion SA.

  Moreover, the fat and oil deterioration degree measuring apparatus 1 has the first comparison information calibrated for each individual fat and oil deterioration degree measuring apparatus 1. For this reason, even if there are individual differences in the members constituting the oil and fat deterioration degree measuring apparatus 1, it is possible to measure an acid value with high accuracy.

  Moreover, the fat and oil deterioration degree measuring apparatus 1 compares the first measurement information and the first comparison information with respect to the master test paper S as the color reference body indicating the reference color corresponding to the fat and oil deterioration degree, and the comparison. As a calibration means for calibrating the intensity of light emitted from the LED 20 or the output signal of the light receiving element 26 according to the result, an adjustment volume and control unit 9 are provided. For this reason, even if it is a case where each part of LED20, the light receiving element 26, etc. which comprises the fat-and-oils degradation degree measuring apparatus 1 deteriorates, the measurement accuracy of an acid value can be made into a normal state.

(Sixth embodiment)
(Other forms of optical system 31)
In the first to fifth embodiments described above, the optical system 28 shown in FIG. 14 may be used instead of the optical system 2 shown in FIG. The first to fifth embodiments described above can also be implemented by using the optical system 28. In addition, in the optical system 28 shown in FIG. 14, about the member which has the same function as the optical system 2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The optical system 28 is configured to guide the light emitted from the LED 20 to the coloring portion SA via the triangular prism 29 and to reflect the light reflected by the coloring portion SA to the light receiving element 26 via the triangular prism 29. It has become. In the optical system 28, a triangular prism 29 is arranged instead of a transparent resin plate fitted in the window portion 19. The triangular prism 29 is disposed so that the bottom surface portion 29 </ b> A faces the window portion 18, and one right-angle surface 29 </ b> B is an incident surface for light emitted from the LED 20. The other right-angled surface 29 </ b> C serves as an exit surface from which the light reflected by the colored portion SA is emitted from the triangular prism 29 toward the light receiving element 26. A condensing lens 30 is disposed between the triangular prism 29 and the LED 20.

  In the optical system 28 configured as described above, the light emitted from the LED 20 is refracted toward the colored portion SA by the triangular prism 29 as a refracting means. For this reason, the light emitted from the LED 20 can be made to enter the colored portion SA close to the vertical direction. Therefore, in the light receiving element 26, it is possible to obtain a light reception intensity that accurately reflects the coloration state of the coloration portion SA.

(Seventh embodiment)
(Other forms of optical system 2)
The optical system 2 may have the configuration of the optical system 31 shown in FIG. In the optical system 31 shown in FIG. 15, members having the same functions as those of the optical system 2 are denoted by the same reference numerals and description thereof is omitted.

  The optical system 31 includes a reflecting mirror 32 and a light receiving element 33 as second light receiving means. The reflecting mirror 32 is disposed outside the optical path of the light irradiated from the LED 20 and incident on the colored portion SA, and at a position where the light irradiated from the LED 20 directly enters. The light receiving element 33 is disposed at a position where the light emitted from the LED 20 reflected by the reflecting mirror 32 can be received. That is, the optical system 31 is configured such that a part of the light emitted from the LED 20 is guided to the light receiving element 33 by the reflecting mirror 32. As the light receiving element 33, a photodiode or the like can be used similarly to the light receiving element 26.

  By configuring the optical system 31 in this way, information based on the intensity of the light reflected by the colored portion SA is measured as a ratio of the intensity of the light received by the light receiving element 26 and the light receiving element 33. It can be acquired as information. The colored portion SA indicates a colored state (color tone) corresponding to the acid value of the edible oil of the specimen absorbed in the colored portion SA. Therefore, since the intensity of light reflected by the coloring portion SA differs depending on the coloring state of the coloring portion SA, the second measurement information (the ratio of the intensity of light received by the light receiving element 26 and the light receiving element 33). ) Differs depending on the coloration state of the coloration part SA. Therefore, when the optical system 31 is used, the control unit 9 obtains the acid value of the edible oil of the sample based on the second measurement information and second comparison information described later, and this acid value is displayed on the display unit 7. Can be displayed.

(About second comparison information)
As described above, the first comparison information described above is based on the intensity of light reflected from the color display part SA and received by the light receiving element 26 and the coloration state of the color display part SA. It is the information that was made to correspond. On the other hand, in the second comparison information, the ratio of the intensity of the light received by the light receiving element 26 and the light receiving element 33 is made to correspond to the coloration state (acid value of the edible oil of the specimen) of the coloring part SA. Information.

  Therefore, the ratio of the intensity of the light irradiated from the LED 20 and reflected by the color forming portion SA and incident on the light receiving element 26 and the intensity of the light irradiated from the LED 20 and reflected by the reflecting mirror 32 and incident on the light receiving element 33 is expressed as a color. Check in advance for each state (acid value of edible oil). For example, as shown in FIG. 16, the acid value (A.V) is associated with light intensity ratio information (R) that is a ratio of the intensity of light received by the light receiving element 26 and the light receiving element 33. Table data is stored in advance in the memory of the control unit 9 as second comparison information. Note that the light intensity ratio information (R) of the table data shown in FIG. 16 is a ratio (A / B) between the intensity A of the light received by the light receiving element 26 and the intensity B of the light received by the light receiving element 33. Is shown as a value obtained by A / D conversion. The colored portion SA of the test paper S is generally set so that the brightness of the colored state increases from the lower acid value side to the higher side. Therefore, the light intensity ratio information (R) in the table data shown in FIG. 16 increases as the acid value increases.

  The control unit 9 refers to the table data (second comparison information), and the light receiving element 26 and the light receiving element 33 receive the colored portion SA in which the edible oil (specimen) whose acid value is to be measured is absorbed. Based on the second measurement information, which is information based on the light intensity, the acid value of the edible oil of the specimen is obtained. Then, the control unit 9 displays the acid value of the specimen determined as described above on the display unit 7.

(Calculation of acid value using table data)
For example, the controller 9 determines the acid value according to the flowchart shown in FIG.

  First, the measurement provided in the operation unit 8 in a state where the test paper S is mounted on the oil / fat deterioration measuring apparatus 1, that is, in a state where the test paper S is mounted on the mounting portion 22 of the lid 4 and the lid 4 is closed. Press a button (not shown). When the measurement button is pressed, the LED 20 emits light, and this light is reflected by the color forming portion SA and received by the light receiving element 26, and the light intensity A (hereinafter referred to as light receiving intensity A) and the reflecting mirror. The light intensity B (hereinafter referred to as light reception intensity B) when reflected by 32 and received by the light receiving element 33 is measured (step S410).

  Based on the received light intensity A and the received light intensity B, A / B (hereinafter referred to as a light intensity ratio A / B) that is a ratio of the intensity of light received by the light receiving element 26 and the light receiving element 33 is calculated. (Step S420). Next, the calculated light intensity ratio A / B is A / D converted and stored in the memory as digital data (step S430).

  The measurement of the light intensity (step S410) and the calculation of the ratio of the measured light intensity (light intensity of the light receiving elements 26 and 33) (step S420) are repeated a plurality of times, for example, 10 times, and calculated for each measurement. Data regarding the light intensity ratio A / B is stored in the memory one by one (step S430). That is, whether the measurement of the light intensity (step S410), the calculation of the light intensity ratio A / B (step S420), and the storage of the data regarding the light intensity ratio A / B in the memory (step S430) have been executed a predetermined number of times. Step S410, step S420, and step S430 are repeated until it is determined (step S440) and executed a predetermined number of times.

  And the average value of the data preserve | saved at memory is calculated as 2nd measurement information (step S450). Here, the measurement of the light intensity (step S410) is repeated a plurality of times, a plurality of light intensity ratios A / B are calculated (step S420), and the average value of the data of the calculated light intensity ratios A / B is calculated. However, the measurement of the light intensity is not limited to a plurality of times and may be performed once, and the data of the light intensity ratio A / B based on the light intensity of one time may be used as the second measurement information.

  Next, the second measurement information and the second comparison information (table data) are compared, and two pieces of light intensity ratio information (R) sandwiching the second measurement information most recently from the second measurement information in the second comparison information. ) And the acid value corresponding to the two light intensity ratio information (R) are specified based on the table data shown in FIG. 16 (step S460). Specifically, for example, it is assumed that the calculated second measurement information is 15, for example. In this case, in the table data of FIG. 16, the two light intensity ratio information (R) that sandwiches the second measurement information most recently are 14 and 16, corresponding to the two light intensity ratio information (R) 14,16. The acid values to be obtained are 1.0 and 2.0, respectively.

  Subsequently, a linear function is obtained for the two specified light intensity ratio information (R) and the acid value corresponding to the two light intensity ratio information (R) (step S470). Specifically, for example, as described above, the second measurement information is 15, the two light intensity ratio information (R) sandwiching the second measurement information is 14 and 16, and the two light intensity ratios. Since the acid values corresponding to the information (R) 14 and 16 are 1.0 and 2.0, respectively, the linear function is represented in the graph shown in FIG. That is, the control unit 9 obtains a linear function K2 corresponding to this graph. Then, based on the linear function K2, an acid value corresponding to the calculated second measurement information is obtained, and this acid value is displayed on the display unit 7 (step S480).

  The data acquired as the second comparison information is discrete data. That is, it is the light intensity ratio information (R) for the discrete acid value (0, 0.5, 1.0, 2.0, 3.0, 4.0 in the present embodiment). However, by obtaining a linear function as described above and using this linear function, the acid value can be obtained even for a portion where there is no data (between data and data). In particular, in the present embodiment, a linear function is obtained using two light intensity ratio information (R) that sandwiches the measured second measurement information most recently and an acid value corresponding thereto. In other words, by obtaining a linear function that approximates a narrow range of data as compared to obtaining a linear function that approximates all data of the second comparison information, the acid value and light that are characterized by this linear function are obtained. The correspondence with the intensity ratio information (R) can be made highly accurate.

  The second measurement information is the ratio of the intensity of light received by the light receiving element 26 and the light receiving element 33 as described above. This light intensity ratio (light intensity ratio A / B) does not change even if the light emission intensity of the LED 20, the light receiving sensitivity of the light receiving element 26, or the like changes as long as the coloration state of the color forming portion SA is the same. Therefore, for example, even when the environmental temperature at which the oil / fat deterioration measuring apparatus 1 is placed changes, and the light emission intensity of the LED 20 and the light reception sensitivity of the light receiving element 26 change, the first change occurs regardless of these changes. 2 Measurement information is kept constant. Therefore, by obtaining the acid value based on the second comparison information and the second measurement information, the acid value can be obtained accurately regardless of the change in the light emission intensity of the LED 20 and the light receiving sensitivity of the light receiving element 26.

(Eighth embodiment)
(Create second comparison information by individual)
By the way, it is preferable from the point of the man-hour at the time of manufacture that the above-mentioned 2nd comparison information (table data) uses the same data irrespective of the individual | organism | solid of the fat-and-oil degradation degree measuring apparatus 1. FIG. As the second comparison information in this case, it is possible to use information prepared by selecting one oil / fat deterioration measuring apparatus 1 as a reference machine and using the reference machine. However, when there are individual differences in the members constituting the oil / fat deterioration measuring apparatus 1, for example, the LED 20, the condensing lens 27, the light receiving element 26, the light receiving element 33, etc., the coloration state of the coloring portion SA is the same. However, the magnitude of the output current output from the light receiving element 26 or the light receiving element 33 may be different.

  Therefore, in the manufacturing process of the fat / oil deterioration measuring apparatus 1, second comparison information is created for each individual fat / oil deterioration measuring apparatus 1, and each individual holds its own second comparison information (stored in a memory). It is also possible to do that. Thereby, even if it is a case where the member which comprises the fats and oils degradation degree measuring apparatus 1 has an individual difference, an acid value with high precision can be measured.

  The creation of the second comparison information for each solid of the oil / fat deterioration measuring device 1 is performed when all members are incorporated in the oil / fat deterioration measuring device 1 and the arrangement of the optical system 31 and the mounting position of the test paper S are determined. Preferably it is done. The creation of the second comparison information for each individual of the fat and oil deterioration degree measuring apparatus 1 can be created, for example, according to the flowchart shown in FIG.

  The flowchart shown in FIG. 19 can be realized, for example, by connecting the fat / oil deterioration degree measuring apparatus 1 to a personal computer for creating second comparison information and executing a program for creating second comparison information provided in the personal computer. . That is, by performing a predetermined process with this personal computer, the second comparison information about the fat / oil deterioration measuring device 1 is obtained, and the obtained second comparison information is stored in the memory of the fat / oil deterioration measuring device 1. Will be.

  In creating the second comparison information, for example, the acid values “0”, “0.5”, “1.0”, “2.0”, “3.0”, “4.0” 6 in advance are used. Six master test papers having a color sample exhibiting a color tone corresponding to each of the two acid values in the colored portion SA are prepared. Then, according to the flowchart shown in FIG. 19, the light intensity ratio information (R) of the oil / fat deterioration measuring device 1 is acquired for the master test paper corresponding to each acid value, and the light intensity ratio information (R) and the acid value are obtained. Are created as second comparison information. And the produced 2nd comparison information is memorize | stored in the memory with which the fat and oil degradation degree measuring apparatus 1 is equipped.

  Prior to the creation of the second comparison information, a master test paper having an acid value of “0” is attached to the oil / fat deterioration measuring apparatus 1 for which the second comparison information is to be obtained. And the process demonstrated below is performed by a personal computer in the state in which the master test paper was mounted in the fat and oil deterioration degree measuring apparatus 1.

  In the processing of the personal computer, first, the LED 20 is caused to emit light, and the received light intensity A when the light is reflected by the colored portion SA of the color tone corresponding to the acid value “0” and received by the light receiving element 26, and the reflecting mirror. The light reception intensity B when reflected by 32 and received by the light receiving element 33 is measured (step S510). Then, the ratio of the received light intensity A and the received light intensity B (light intensity ratio A / B) is calculated (step S520). Then, the data obtained by A / D converting the calculated light intensity ratio A / B is stored in an external memory provided in a personal computer or the like (step S530).

  The measurement of the light intensity (step S510) and the calculation of the ratio of the measured light intensity (light intensity of the light receiving elements 26 and 33) (step S520) are repeated for each measurement several times, for example, 10 times. Data on the light intensity ratio A / B is stored in the external memory one by one (step S530). That is, the measurement of the light intensity (step S510), the calculation of the light intensity ratio A / B (step S520), and the storage of the data related to the light intensity ratio A / B in the external memory (step S530) are executed a predetermined number of times. Step S510, step S520, and step S530 are repeated until it has been determined (step S540) and executed a predetermined number of times. The measurement of the light intensity (step S510), the calculation of the light intensity ratio A / B (step S520), and the storage of the data related to the light intensity ratio A / B in the external memory (step S530) are not limited to a plurality of times. It may be once.

  Next, the average value of the data stored in the external memory is calculated as light intensity ratio information (R) (step S550). Then, the light intensity ratio information (R) and the acid value “0” are stored as a record of the table data in a memory provided in the fat and oil deterioration degree measuring apparatus 1 (step S560). Then, it is determined whether or not the light intensity ratio information (R) has been acquired for all color sample master test papers (step S570).

  If the light intensity ratio information (R) has not been acquired for all the color sample master test papers (No in step S570), it is instructed to mount other acid value master test papers on the mounting unit 22. The notification is performed by, for example, displaying on a personal computer monitor (step S580). Then, when the test paper S having another acid value is mounted on the mounting unit 22, the processes from step S510 to step S580 described above are repeated. On the other hand, when the light intensity ratio information (R) is obtained for the master test papers of all color samples (Yes in step S570), the completion of the creation of the second comparison information is notified (displayed on the monitor of the personal computer). (Step S590). In this way, light corresponding to each of the six acid values of acid values “0”, “0.5”, “1.0”, “2.0”, “3.0”, “4.0” Table data having six records having intensity ratio information (R) is created and stored in a memory provided in the oil and fat deterioration degree measuring apparatus 1.

  In this way, for each individual of the fat / oil deterioration measuring device 1, the second comparison information having the light intensity ratio information (R) measured by the individual is created, and the second comparison information is held in the measured individual. By doing so, even if there are individual differences in the members constituting the oil and fat deterioration degree measuring apparatus 1, it is possible to measure the acid value with high accuracy. In addition, you may give the function which can perform the process of above-mentioned step S510 to step S590 in the fat-and-oil degradation degree measuring apparatus 1 itself. Further, a part or all of steps S510 to S590 may be performed by a human.

(Ninth embodiment)
(Other forms of second comparison information)
As described above, the second comparison information can be created in the form of table data, or in the form of an approximate expression as described below. As described above, the colored portion SA of the test paper S is set so that the brightness of the colored state increases from the low acid value side to the high color side. Therefore, by appropriately selecting the wavelength of the light reflected by the colored portion SA, the relationship between the acid value and the second measurement information (the ratio of the received light intensity A and the received light intensity B) is approximated to a predetermined function. Can be handled. That is, an approximate expression indicating the relationship between the acid value and the second measurement information is obtained in advance, and the acid value can be obtained based on this approximate expression.

The approximate expression is represented, for example, in the form of Y = A _K X ^K +... + A ₁ X + A ₀ . Y is an acid value, and X is second measurement information. A 0 _... A _K is a factor for causing hold the relationship between the second measurement information and the acid value in the approximate expression. Instead of the table data, the coefficients of the approximate expression (A 0 _... A _K) to keep in the memory, the coefficient stored second measurement information measured as (X) in the memory (A 0 _... A _K ), An approximate expression may be created, and the acid value (Y) may be obtained based on the approximate expression.

(Calculation of acid value using approximate equation)
Specifically, in the oil and fat deterioration degree measuring apparatus 1, for example, according to the flowchart shown in FIG. 20, the acid value is obtained using an approximate expression.

  First, the measurement provided in the operation unit 8 in a state where the test paper S is mounted on the oil / fat deterioration measuring apparatus 1, that is, in a state where the test paper S is mounted on the mounting portion 22 of the lid 4 and the lid 4 is closed. Press a button (not shown). When the operation button is pressed, the LED 20 emits light, and this light is reflected by the colored portion SA and received by the light receiving element 26, and the light intensity (light receiving intensity A) is reflected by the reflecting mirror 32 to the light receiving element 33. The intensity of light when received (light reception intensity B) is measured (step S610). Based on the received light intensity A and the received light intensity B, the ratio of the intensity of light received by the light receiving element 26 and the light receiving element 33 (light intensity ratio A / B) is calculated (step S620).

  Next, the calculated light intensity ratio A / B is A / D converted and stored in the memory as digital data (step S630). The measurement of the light intensity (step S610) and the calculation of the ratio of the measured light intensity (the light intensity of the light receiving elements 26 and 33) (step S620) are repeated a plurality of times, for example, 10 times, and calculated for each measurement. Data regarding the light intensity ratio A / B is stored in the memory one by one (step S630). That is, whether the measurement of the light intensity (step S610), the calculation of the light intensity ratio A / B (step S620), and the storage of the data regarding the light intensity ratio A / B in the memory (step S630) have been executed a predetermined number of times. Step S460, step S620, and step S630 are repeated until it is determined (step S640) and executed a predetermined number of times.

  And the average value of the data preserve | saved at memory is calculated as 2nd measurement information (step S650). Here, measurement of the light intensity (step S610) is repeated a plurality of times, a plurality of light intensity ratios A / B are calculated (step S620), and the average value of the data of the calculated light intensity ratios A / B is calculated. However, the measurement of the light intensity is not limited to a plurality of times and may be performed once, and the data of the light intensity ratio A / B based on the light intensity of one time may be used as the second measurement information.

Next, an approximate expression is created using the coefficients (A ₀ ... A _K ) of the approximate expression stored in advance in the memory (step S660). Then, the second measurement information is substituted into the created approximate expression to calculate the acid value, and this acid value is displayed on the display unit 7 (step S670).

(Tenth embodiment)
(Create an approximate expression for each individual)
By the way, the coefficient for the above approximate expression (Y = A _K X ^K +... + A ₁ X + A ₀ ) can be used at the time of manufacture regardless of the individual of the oil / fat deterioration measuring apparatus 1. It is preferable from the point of man-hour. As the approximate expression in this case, an oil and fat deterioration degree measuring device 1 selected as a reference machine and the one created using this reference machine can be used. However, when there are individual differences in the members constituting the oil / fat deterioration measuring apparatus 1, for example, the LED 20, the condensing lens 27, the light receiving element 26, the light receiving element 33, etc., the coloration state of the coloring portion SA is the same. However, the magnitude of the output current output from the light receiving element 26 or the light receiving element 33 may be different.

Therefore, in the manufacturing process of the fat / oil deterioration measuring apparatus 1, an approximate expression is created for each individual fat / oil deterioration measuring apparatus 1, and the coefficient (A ₀ ... A _K ) of the own approximate expression is held in each individual. (Save in memory). Thereby, even if it is a case where the member which comprises the fats and oils degradation degree measuring apparatus 1 has an individual difference, an acid value with high precision can be measured.

  The approximation formula for each solid of the oil / fat deterioration measuring device 1 is created when all members are incorporated into the oil / fat deterioration measuring device 1 and the arrangement of the optical system 31 and the mounting position of the test paper S are determined. Is preferred. The approximate expression for each individual of the fat and oil deterioration degree measuring apparatus 1 can be generated according to the flowchart shown in FIG. 21, for example.

  In the flowchart shown in FIG. 21, for example, the oil and fat deterioration degree measuring apparatus 1 is connected to a personal computer for creating approximate expressions as second comparison information, and a program for creating second comparison information (approximate expressions) provided in the personal computer is executed. This can be achieved. That is, the approximate expression about the oil-and-oil degradation degree measuring apparatus 1 is calculated | required by performing a predetermined process with this personal computer. Then, the obtained coefficient of the approximate expression is stored in the memory of the fat and oil deterioration degree measuring apparatus 1.

  In preparing the approximate expression, for example, six acids having an acid value of “0”, “0.5”, “1.0”, “2.0”, “3.0”, “4.0” are used in advance. Six master test papers having a color sample exhibiting a color tone corresponding to each price are prepared in the coloring portion SA. Then, according to the flowchart shown in FIG. 21, the light intensity ratio information (R) of the fat / oil deterioration degree measuring device 1 is measured for the master test paper corresponding to each acid value, and the light intensity ratio information (R) and the acid value are measured. An approximate expression representing the relationship is created as second comparison information. And the produced 2nd comparison information (approximation formula) is memorize | stored in the memory with which the fat-and-oil degradation degree measuring apparatus 1 is equipped.

  Prior to the creation of the approximate expression, a master test paper having an acid value of “0” is attached to the oil / fat deterioration measuring apparatus 1 for which an approximate expression is to be obtained. And the process demonstrated below is performed by a personal computer in the state in which the master test paper was mounted in the fat and oil deterioration degree measuring apparatus 1.

  In the processing of the personal computer, first, the LED 20 is caused to emit light, and the received light intensity A when the light is reflected by the colored portion SA of the color tone corresponding to the acid value “0” and received by the light receiving element 26, and the reflecting mirror. The light reception intensity B when reflected by 32 and received by the light receiving element 33 is measured (step S710). Then, the ratio of the received light intensity A and the received light intensity B (light intensity ratio A / B) is calculated (step S720). Data obtained by A / D converting the measured light intensity ratio A / B is stored in an external memory provided in a personal computer or the like (step S730).

  The measurement of the light intensity (step S710) and the calculation of the ratio of the measured light intensity (the light intensity of the light receiving elements 26 and 33) (step S720) are repeated for each measurement a plurality of times, for example, 10 times. Data relating to the light intensity ratio A / B is stored in the external memory one by one (step S730). That is, the measurement of the light intensity (step S710), the calculation of the light intensity ratio A / B (step S720), and the storage of the data related to the light intensity ratio A / B in the external memory (step S730) are executed a predetermined number of times. Step S710, step S720, and step S730 are repeated until it is determined (step S740) and executed a predetermined number of times. The measurement of the light intensity (step S710), the calculation of the light intensity ratio A / B (step S720), and the storage of the data related to the light intensity ratio A / B in the external memory (step S730) are not limited to a plurality of times. It may be once.

  Next, the average value of the data stored in the external memory is calculated as light intensity ratio information (R) and stored in the external memory (step S750). Then, it is determined whether or not the light intensity ratio information (R) has been acquired for all color sample master test papers (step S760).

  If the light intensity ratio information (R) has not been acquired for all color sample master test papers (No in step S760), it is instructed to mount other acid value master test papers on the mounting unit 22. Notification is performed (displayed on a personal computer monitor or the like) (step S770). When another acid value master test paper is mounted on the mounting unit 22, the processing from step S710 to step S750 described above is repeated. On the other hand, when the light intensity ratio information (R) is acquired for the master test papers of all the color samples (Yes in step S760), the light intensity ratios for the master test papers of each color sample stored in the external memory. An approximate expression is obtained based on the information (R) (step S780).

  Here, since the light intensity ratio information (R) is obtained for each of the six master test papers, an approximate expression is obtained from the six light intensity ratio information (R). That is, an approximate expression of a quintic function is obtained at the maximum. It is assumed that the light wavelength for measuring the light intensity is selected to be able to measure the six light intensity ratio information (R) for which the approximate expression is not indefinite. Subsequently, the obtained coefficient of the approximate expression is stored in a memory provided in the oil and fat deterioration degree measuring apparatus 1 (step S790).

  Thus, for each individual of the fat and oil degradation degree measuring apparatus 1, an approximate expression measured by the individual is created, and the coefficient of the approximate expression is held in the individual itself, so that the fat and oil deterioration degree measuring apparatus 1 is Even when there are individual differences in the constituent members, a highly accurate acid value can be measured.

(Eleventh embodiment)
(Other forms of optical system 31)
In the seventh, eighth, ninth, and tenth embodiments described above, an optical system 34 shown in FIG. 22 may be used instead of the optical system 31 shown in FIG. The seventh, eighth, ninth, and tenth embodiments described above can also be implemented by using the optical system 34. In the optical system 34 shown in FIG. 22, members having the same functions as those of the optical system 31 are denoted by the same reference numerals, and description thereof is omitted.

  The optical system 34 includes a half mirror 35 between the LED 20 and the light receiving element 33 instead of the reflecting mirror 32. A condensing lens 36 is disposed between the LED 20 and the half mirror 35. The reflection surface of the half mirror 35 is arranged at 45 degrees with respect to the optical axis L1 of the LED 20 and the condenser lens 36. Then, the color portion SA, the light receiving element 26, and the condenser lens 27 are disposed at a position where the optical axis L2 thereof is orthogonal to the optical axis L1. The light receiving element 33 is disposed on an extension line of the optical axis L1 with the half mirror 35 interposed therebetween.

  In the optical system 34 configured as described above, the light emitted from the LED 20 is divided into light reflected by the half mirror 35 and light transmitted through the half mirror 35 in the half mirror 35. The light emitted from the LED 20 and reflected by the half mirror 35 enters the colored portion SA. Then, the light is reflected by the color portion SA with a reflection amount corresponding to the color state of the color portion SA, passes through the half mirror 35, and enters the light receiving element 26. On the other hand, the light emitted from the LED 20 and transmitted through the half mirror 35 enters the light receiving element 33.

  Accordingly, the light receiving intensities A and B can be measured at the light receiving elements 26 and 33, respectively. By configuring the optical system 34 as described above, the light emitted from the LED 20 can be made incident on the colored portion SA in a state of being nearly perpendicular. Therefore, in the light receiving element 26, it is possible to obtain a light reception intensity that accurately reflects the coloration state of the coloration portion SA.

(Twelfth embodiment)
(Other forms of optical system 31)
In the seventh, eighth, ninth, and tenth embodiments described above, an optical system 37 shown in FIG. 23 may be used in place of the optical system 31 shown in FIG. The seventh, eighth, ninth and tenth embodiments described above can also be implemented by using the optical system 37. In the optical system 37 shown in FIG. 23, members having the same functions as those of the optical system 31 are denoted by the same reference numerals and description thereof is omitted.

  The optical system 37 is provided with a reflecting mirror 38 between the LED 20 and the colored portion SA instead of the reflecting mirror 32. The reflecting mirror 38 is formed with reflecting surfaces on both sides, and a light passage hole 39 is formed substantially at the center of the reflecting surface. A condensing lens 40 is disposed between the LED 20 and the reflecting mirror 38.

  The reflecting mirror 38 is disposed such that the reflecting surface is disposed at 45 degrees with respect to the optical axis L3 of the LED 20 and the condenser lens 40, and the optical axis L3 passes through the approximate center of the light passage hole 39. The colored portion SA is arranged at a position sandwiching the reflecting mirror 38 with respect to the LED 20 so that the light reflecting surface of the colored portion SA is orthogonal to the optical axis L3. The light receiving element 26 and the condenser lens 27 are disposed at a position where the optical axis L4 thereof is orthogonal to the optical axis L3.

  In the optical system 37, a part of the light at the outer peripheral portion of the light beam emitted from the LED 20 is reflected by the reflecting mirror 38, and the light receiving element 33 is disposed at a position where the light can be received.

  The focal position of the condenser lens 40 is set closer to the colored portion SA or the LED 20 than the light passage hole 39. The aperture of the condenser lens 40 is set so that a part of the light at the outer periphery of the light beam emitted from the LED 20 is reflected by the reflecting mirror 38. A part of the light reflected by the reflecting mirror 38 is received by the light receiving element 33 as described above.

  In the optical system 37 configured as described above, the light emitted from the LED 20 is divided into light passing through the light passage hole 39 and light reflected by the reflecting mirror 38 in the reflecting mirror 38. The light that has passed through the light passage hole 39 enters the colored portion SA. Then, the reflected light is reflected by the colored portion SA with a reflection amount corresponding to the colored state of the colored portion SA, and further reflected by the reflecting surface around the light passage hole 39 of the reflecting mirror 38 and enters the light receiving element 26. On the other hand, the light emitted from the LED 20 and reflected by the reflecting mirror 38 enters the light receiving element 33.

  Accordingly, the light receiving intensities A and B can be measured at the light receiving elements 26 and 33, respectively. By configuring the optical system 37 as described above, the light emitted from the LED 20 can be made incident on the colored portion SA in a state of being nearly perpendicular. Therefore, in the light receiving element 26, it is possible to obtain a light reception intensity that accurately reflects the coloration state of the coloration portion SA. In addition, by configuring the opening of the light passage hole 39 as small as possible, the amount of reflection can be increased when the light reflected by the color portion SA is reflected by the reflecting mirror 38 to the light receiving element 26. That is, in the light receiving element 26, it is possible to obtain a received light intensity that accurately reflects the coloration state of the color forming portion SA.

(Thirteenth embodiment)
(Calibration of the oil / fat deterioration measuring apparatus 1)
In the oil and fat deterioration degree measuring apparatus 1, for example, the LED 20, the light receiving element 26, the light receiving element 33, and the like deteriorate due to long-term use. For this reason, even if the coloring state of the coloring portion SA is the same, the light intensity ratio A / B in the light receiving elements 26 and 33 may be different. That is, the acid value measured when the oil / fat deterioration measuring apparatus 1 is new may be different from the acid value measured when used for many years.

  Therefore, the gains of the signals output from the light receiving elements 26 and 33 are set so that the intensity of the light received by the light receiving elements 26 and 33 becomes a predetermined intensity corresponding to the coloration state of the coloring portion SA. Calibration means for calibrating may be provided. Specifically, measurement is performed on a master test paper as a color reference body, and output gains of the light receiving elements 26 and 33 are adjusted so that an acid value corresponding to the master test paper is displayed on the display unit 7. The control unit 9 is configured to calibrate the output gain of the light receiving elements 26 and 33 according to the setting of the adjustment volume.

  As described above, the fat and oil deterioration degree measuring apparatus 1 includes the LED 20 as a light irradiation unit that irradiates light to the colored portion SA that generates different color depending on the degree of deterioration of the absorbed edible oil, and the LED 20. The light receiving element 26 that receives the reflected light reflected from the colored portion SA and the second light receiving means that receives the light that is not reflected from the colored portion SA among the light emitted from the LED 20. And an element 33. Then, as the predetermined information, the second comparison information, which is information in which the ratio of the intensity of light received by the light receiving element 26 and the light receiving element 33 is associated with the coloration state of the coloring portion SA, and the light receiving element 26 Based on the second measurement information, which is information relating to the ratio of the intensity of light received by the light receiving element 33, the degree of deterioration of the edible oil absorbed in the colored portion SA is determined by the calculation unit provided in the control unit 9. Is done.

  By configuring the oil / fat deterioration measuring apparatus 1 in this manner, the acid value can be accurately obtained regardless of the light emission intensity of the LED 20 and the change in the light receiving sensitivity of the light receiving element 26.

  In addition, the oil / fat deterioration measuring apparatus 1 has a half mirror 35 disposed in the optical path of the light emitted from the LED 20, and the half mirror 35 has a first light receiving unit on either the reflection side or the transmission side. A light receiving element 26 is arranged, and a light receiving element 33 as a second light receiving means is arranged on the other side with respect to the one side. The LED 20 is arranged such that the optical axis L1 of the light emitted from the LED 20 is perpendicular to the light reflecting surface of the colored portion SA.

  By configuring the oil / fat deterioration measuring apparatus 1 in this way, the light emitted from the LED 20 can be made incident on the colored portion SA in a state close to vertical. Therefore, in the light receiving element 26, it is possible to obtain a light reception intensity that accurately reflects the coloration state of the coloration portion SA.

  Further, in the oil and fat deterioration degree measuring apparatus 1, a reflecting mirror 38 having a light passage hole 39 is disposed in the optical path of light emitted from the LED 20, and the first light receiving means is disposed on one side of the reflecting mirror 38. The light receiving element 26 as the second light receiving means is disposed on the reflection side of the reflecting mirror 38 on the opposite side. And LED20 is arrange | positioned so that the optical axis L3 of the light irradiated from here may be orthogonally crossed with respect to the light reflection surface of the colored part SA.

  By configuring the oil / fat deterioration measuring apparatus 1 in this way, the light emitted from the LED 20 can be made incident on the colored portion SA in a state close to vertical. Therefore, in the light receiving element 26, it is possible to obtain a light reception intensity that accurately reflects the coloration state of the coloration portion SA.

  Moreover, the fat and oil deterioration degree measuring apparatus 1 holds the second comparison information in the form of table data or an approximate expression.

  By holding the second comparison information in the form of table data or in the form of an approximate expression, the acid value corresponding to the coloration state of the coloration unit SA can be easily obtained.

  Moreover, the fat and oil deterioration degree measuring apparatus 1 has the second comparison information calibrated for each individual fat and oil deterioration degree measuring apparatus 1.

  For this reason, even if there are individual differences in the members constituting the oil and fat deterioration degree measuring apparatus 1, it is possible to measure an acid value with high accuracy.

  Moreover, the fat and oil deterioration degree measuring apparatus 1 compares the second measurement information with respect to the master test paper S as the color reference body indicating the reference color corresponding to the fat and oil deterioration degree, and the second comparison information. As calibration means for calibrating the output signals of the light receiving elements 26 and 33 according to the comparison result, an adjustment volume and control unit 9 are provided.

  For this reason, even if each part, such as the light receiving elements 26 and 33 which comprise the fat-and-oil degradation degree measuring apparatus 1, deteriorates, the measurement precision of an acid value can be made into a normal state.

  In each of the above-described embodiments, the condensing lens 27 arranged in the optical path where the light reflected by the color portion SA reaches the light receiving element 26 collects the light reflected by the color portion SA on the light receiving element 26. It has the function of making it enter by making it light. Therefore, it is possible to increase the light receiving intensity of the light reflected by the coloring portion SA at the light receiving element 26, and it is possible to obtain the light receiving intensity that accurately reflects the coloration state of the coloring portion SA.

  However, when the light receiving element 26 is arranged at the image forming position of the light reflecting surface of the colored portion SA by the condensing lens 27, the coloring is caused by unevenness or color unevenness of the light reflecting surface of the colored portion SA. The colored state of the part SA may not be accurately reflected in the received light intensity. Therefore, even if the coloring portion SA, the condensing lens 27, and the light receiving element 26 are arranged so that the light receiving surface of the light receiving element 26 is not arranged at the imaging position of the light reflecting surface of the coloring portion SA by the condensing lens 27. Good.

  By configuring in this way, light that is less affected by unevenness or unevenness of the light reflecting surface of the colored portion SA can be made incident on the light receiving element 26. Therefore, even when the light reflecting surface of the color portion SA has irregularities or uneven color, the light receiving element 26 can obtain a light receiving intensity that accurately reflects the color state of the color portion SA.

  Note that a light pipe as a light uniformizing unit may be disposed between the coloring portion SA and the light receiving element 26, and the light reflected by the coloring portion SA may be incident on the light receiving element 26 through the light pipe.

  By configuring in this way, the light reflected by the colored portion SA is made uniform in illuminance distribution when passing through the light pipe. Therefore, even when the light reflecting surface of the color portion SA has irregularities, color unevenness, or the like, the light receiving element 26 can obtain a received light intensity that accurately reflects the color state of the color portion SA. .

  In addition, a light diffusing plate as a light diffusing unit is disposed between the colored portion SA and the light receiving element 26, and the light reflected by the colored portion SA is transmitted through the light diffusing plate and incident on the light receiving element 26. Also good.

  By configuring in this way, the light reflected by the colored portion SA can have a uniform illuminance distribution when passing through the light diffusion plate. Therefore, even when the light reflecting surface of the color portion SA has irregularities, color unevenness, or the like, the light receiving element 26 can obtain a received light intensity that accurately reflects the color state of the color portion SA. .

  In each of the above-described embodiments, the LED 20 is a white LED that emits white light, but an LED that emits red light, green light, or blue light may be used. In this case, as the first comparison information and the second comparison information, information corresponding to the emission color of the LED is used. In addition to visible light, the coloration state of the colored portion SA can be determined using light having a wavelength of 1000 nm to 2000 nm.

  In each of the above-described embodiments, a transparent resin plate is fitted to the window portion 18 of the test paper mounting body 3, but the window portion 18 may have a blow-by configuration without fitting the resin plate. With such a configuration, the loss of light passing through the window portion 18 can be reduced, and the received light intensity that more accurately reflects the color state of the color portion SA can be obtained.

(Edible oil management method)
As a method for managing edible oil, by using the fat and oil deterioration measuring apparatus 1 configured as described above, the deterioration state of the edible oil can be quantitatively grasped, and the deterioration state of the edible oil is appropriately managed. be able to.

  Specifically, in the case of edible oils, the “Ministry of Health, Labor and Welfare” of the Ministry of Health, Labor and Welfare stipulates that the edible oil used should be replaced when the acid value exceeds 2.5. However, when the operator using the test paper S is also visually determined (comparison between the colored portion SA and the color sample), individual differences among the workers occur. In particular, since the change in the coloring state of the coloring portion SA is continuous, individual differences are likely to occur in the comparison between the coloring state of the coloring portion SA and the color sample. However, objective management that eliminates individual differences among workers can be performed by quantitatively managing the deterioration state of the edible oil using the oil and fat deterioration degree measuring apparatus 1.

  The degree of acid value increase in frying varies depending on the situation. For example, if the acid value increase per day is less than 0.5, the end of the day can be determined if the oxidation prior to work can be determined to be 2.0. It can also be predicted that it will be within 2.5 at the end of a day of cooking. That is, the above prediction can be performed by quantitatively managing the acid value of the edible oil using the oil / fat deterioration measuring apparatus 1. In addition, since the acid value of the edible oil at the end of cooking for one day can be predicted, wasteful disposal of the edible oil can be prevented.

Example 1
In the table shown in FIG. 24, the cooking oil adjusted by adding a fatty acid so that the acid value is around 0, 1.0, 2.0, 2.5, and 3.0 is attached to the test paper S. This shows the result when the acid value was measured using the oil / fat deterioration measuring apparatus 1. In the measurement, AV-CHECK (registered trademark) manufactured by Toyo Roshi Kaisha, Ltd. was used as the test paper S. The adjusted edible oil was measured for the actual acid value by a standard fat analysis method (edited by the Japan Oil and Fat Science Society). As a result, as shown in FIG. 24, the acid value measured by the fat and oil deterioration degree measuring apparatus 1 was almost the same as the analysis value obtained by the standard fat and oil analysis method. Thus, an accurate acid value can be measured by using the fat and oil deterioration degree measuring apparatus 1.

(Example 2)
At various work sites, used oil and waste oil fried tempura, fries, fried chicken, etc. were collected. Each collected oil was filtered with a filter paper, and then the acid value was measured according to the standard fat and oil analysis test method. For each collected oil, the acid value was read by a predetermined method using AV-CHECK (registered trademark) which is a representative test paper for acid value determination. Specifically, the color reaction portion of AV-CHECK was immersed in oil collected at room temperature to cause coloration, and the degree of coloration after a lapse of a predetermined time was read by comparison with a standard color. Subsequently, with respect to this AV-CHECK, the degree of coloration was read with the oil / fat deterioration measuring apparatus used in Example 1 and displayed as an acid value. FIG. 25 shows the correlation between the actually measured value (titration value) of the acid value by the standard fat analysis test method and the visual judgment value, the actual acid value (titration value) by the standard fat analysis test method, and the acid by the measuring device. The correlation with value is shown in FIG. As is clear from FIGS. 25 and 26, it was found that the acid value displayed by the measuring device is closer to the actually measured value than the acid value judged by visual observation. In addition, since the acid value can be displayed digitally in the measurement of the degree of fat deterioration according to the present invention, it is possible to comply with the standard of the acid value of 2.5, which is the hygiene standard of the Ministry of Health, Labor and Welfare. it can. Therefore, it is possible to manage the oil used appropriately in terms of food hygiene, and at the same time, it is possible to use edible oil as frying oil without waste.

  In the above-described embodiment, the case where the acid value of edible oil is measured as fat is described. However, the present invention is used for various fats and oils other than edible oil, for example, hydraulic products such as machine lubricating oil and cylinders. It can also be applied when measuring deterioration of oil and the like.

SA: Colored part (colored body)
DESCRIPTION OF SYMBOLS 1 ... Oil-and-oil degradation degree measuring apparatus 3 ... Test paper mounting body (colored body mounting body)
4 ... Lid 5 ... Main body 7 ... Display section (display means section)
9 ... Control unit (calculation unit, calibration means)
10 ... Base 20 ... LED (light irradiation means)
22 ... Mounting portion 26 ... Light receiving element (first light receiving means)
27 ... Condensing lens 29 ... Triangular prism (refractive means)
33. Light receiving element (second light receiving means)
35 ... Half mirror 38 ... Reflector 39 ... Light passage hole

Claims (14)

A light irradiation means for irradiating light to a colored body that reacts with fats and oils and produces different color depending on the degree of deterioration of the fats and oils;
A first light receiving means for receiving the reflected light emitted from the light irradiating means and reflected by the colored body;
Based on predetermined information, a calculation unit that determines the degree of deterioration of the oil and fat,
A display unit for displaying the degree of deterioration of the oil and fat determined by the arithmetic unit;
With
The predetermined information may possess a predetermined first comparison information, and a first measurement information is information based on the intensity of the reflected light received by the first light receiving means,
Between the colored body and the first light receiving means, there is a condenser lens for collecting the light incident on the first light receiving means reflected by the colored body,
The light receiving surface of the first light receiving means is disposed at a position shifted from the imaging position of the colored body by the condenser lens;
A device for measuring the degree of deterioration of fats and oils. In the oil and fat deterioration degree measuring apparatus according to claim 1,
Of the light emitted from the light irradiation means, comprising a second light receiving means for receiving light that is not reflected by the color body,
The predetermined information includes predetermined second comparison information, and second measurement information that is information based on the intensity of light received by the first light receiving unit and the intensity of light received by the second light receiving unit. Having
A device for measuring the degree of deterioration of fats and oils. In the oil and fat deterioration degree measuring apparatus according to claim 2,
A half mirror is arranged in the optical path of the light emitted from the light irradiation means,
The first light receiving means is arranged on either the reflection side or the transmission side of the half mirror, and the second light receiving means is arranged on the other side with respect to the one side,
The optical axis of the light emitted from the light irradiating means and incident on the colored body is arranged perpendicular to the light reflecting surface of the colored body;
A device for measuring the degree of deterioration of fats and oils. In the oil and fat deterioration degree measuring apparatus according to claim 2,
A reflecting mirror having a light passage hole is arranged in the optical path of the light irradiated from the light irradiation means,
The first light receiving means is disposed across the reflecting mirror, and the second light receiving means is disposed on the reflecting side of the reflecting mirror,
The optical axis of the light emitted from the light irradiating means and incident on the colored body is arranged perpendicular to the light reflecting surface of the colored body;
A device for measuring the degree of deterioration of fats and oils. In the oil and fat deterioration degree measuring apparatus according to claim 1,
The light irradiation means is disposed in an oblique direction with respect to the light reflecting surface of the color former, and is irradiated from the light irradiation means between the light irradiation means and the light reflection surface of the color former. Refracting means for refracting light on the light reflecting surface side of the colored body is disposed;
A device for measuring the degree of deterioration of fats and oils. In the oil-and-fat deterioration measuring device according to any one of claims 1 to 5 ,
A light diffusing means is disposed between the colored body and the first light receiving means;
A device for measuring the degree of deterioration of fats and oils. In the oil-and-fat deterioration measuring device according to any one of claims 1 to 6 ,
The oil and fat deterioration degree measuring apparatus has a main body and a colored body mounting body on which the colored body is mounted, and the colored body mounting body is detachable from the main body.
A device for measuring the degree of deterioration of fats and oils. In the fat and oil deterioration degree measuring apparatus according to claim 7 ,
The colored body mounting body includes a pedestal portion attached to the main body and a lid that can be opened and closed with respect to the pedestal portion.
A mounting portion to which the colored body is mounted is provided inside the lid;
A device for measuring the degree of deterioration of fats and oils. In the oil and fat deterioration degree measuring apparatus according to any one of claims 1 to 8 ,
The first comparison information and the second comparison information are in the form of table data or an approximate expression;
A device for measuring the degree of deterioration of fats and oils. In the oil-and-fat deterioration measuring device according to any one of claims 1 to 9 ,
The first comparison information and the second comparison information are calibrated for each individual fat and oil deterioration measuring device,
A device for measuring the degree of deterioration of fats and oils. In the oil and fat deterioration degree measuring apparatus according to claim 1,
Based on the comparison result between the first measurement information for the color reference body indicating the reference color corresponding to the degree of deterioration of the oil and fat and the first comparison information, the light irradiation unit irradiates the light according to the comparison result. Calibration means capable of calibrating at least one of the intensity of the light and the output signal of the first light receiving means,
A device for measuring the degree of deterioration of fats and oils. In the oil and fat deterioration degree measuring apparatus according to claim 2,
Based on the comparison result between the second measurement information and the second comparison information with respect to the color reference body indicating the reference color corresponding to the degree of deterioration of the oil and fat, the second measurement information is determined according to the comparison result. Having calibration means that can be calibrated;
A device for measuring the degree of deterioration of fats and oils. In the manufacturing method of the oil-fat deterioration measuring device according to any one of claims 1 to 12 ,
The first comparison information and the second comparison information are calibrated for each individual fat and oil deterioration degree measuring device using a color reference body indicating a reference color corresponding to the fat and oil deterioration degree,
The manufacturing method of the fat-and-oils degradation degree measuring apparatus characterized by these. The fat and oil deterioration degree measuring apparatus according to claim 1 or 12 or the fat and oil deterioration degree measuring apparatus manufactured by the manufacturing method according to claim 13 is used to determine a fat or oil deterioration state. Managing,
A method for managing the deterioration state of fats and oils.

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