JPH0754275B2 - Pressure distribution measuring device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for measuring a pressure distribution at a measurement point using a pressure recording sheet.

[Conventional technology]

For example, a method of measuring with a pressure recording sheet and a densitometer is known for a measurement point where it is impossible to directly measure the pressure with a measuring instrument, such as the tightening pressure of a gasket. There is. This pressure recording sheet is coated with a microencapsulated dye, and is used in combination with an ink film in which the microcapsule cleaves when pressure is applied, and a dye of the cleaved microcapsule, such as magenta. It is composed of a developer film which is dyed into. The color density of this color developer film (hereinafter simply referred to as "density") has a correlation with the applied pressure. Therefore, use a densitometer to measure the reflection density value of the color-developed area. The pressure value applied to the pressure recording sheet can be checked by referring to the concentration / pressure curve showing the relationship with.

[Problems to be Solved by the Invention]

In the conventional pressure measurement described above, a part of the pressure recording sheet is spot-photometered with a densitometer, and the pressure value of the measured value is examined from the obtained density value. On the other hand, no inconvenience occurs in measurement. However, the pressure distribution using the densitometer described above cannot measure the pressure distribution at the measurement point where the pressing force changes depending on the position.

[Object of the Invention]

It is an object of the present invention to provide a pressure distribution measuring device capable of measuring the pressure distribution at a measurement point from the concentration distribution recorded on a pressure recording sheet.

[Means for Solving the Problems]

In order to solve the above problems, the present invention is a scanner for moving a photometric head to two-dimensionally scan a pressure recording sheet, and measuring a density value color-recorded on the pressure recording sheet.
Corresponding to the environmental classification determined from the environmental classification determination unit that determines the predetermined environmental classification from the temperature and humidity when the pressure recording sheet was color-recorded and from multiple concentration / pressure curves that represent the relationship between concentration and pressure. While selecting one and referring to the selected concentration / pressure curve, a pressure value conversion unit that converts the concentration value at each point measured by the scanner into a pressure value, and a color that is colored according to the range of pressure values It is composed of a color monitor for displaying an image and a color printer for outputting a hard copy of the color image.

[Action]

A pressure recording sheet is set at the measured point and color is developed to a density value according to the pressure value. The environment classification determination unit determines the environment classification based on the temperature and humidity at this time. The color recording completed pressure recording sheet (correctly the color developer film) is set on the scanner, the photometric head is moved in the two-dimensional direction, and the density value at each point is measured. The obtained concentration value at each point is sent to the pressure value conversion unit. The pressure value conversion unit selects a concentration / pressure curve corresponding to the environment classification determined by the environment classification determination unit, and converts the concentration value at each point into a pressure value with reference to this curve. The pressure value at each point is colored according to the pressure range, and the obtained color image is displayed on the color monitor. By observing this color monitor, it is possible to check the pressure distribution at the measurement point from the color of the color image. The color image can also be converted into a hard copy by a color printer.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

〔Example〕

In FIG. 1, a stage 11 is provided above the scanner 10.
Is horizontally mounted, and a pressure recording sheet 12 (correctly a color developer film) set at a measurement point and colored is set on the sheet, and is pressed flat by a transparent cover 13. In the pressure recording sheet 12, the pressed portion is colored magenta, and the density thereof is pressure-related. The transparent cover 13 has the left end portion attached to the fixed plate 14, and the right end can be lifted when the pressure recording sheet 12 is set. Further, the edge of the transparent cover 13 is provided with a scale so that the scanning range can be known. A reference color plate 15 for use in zero correction or the like is adhered to the stage 11, and a red mark 16 and a white mark 17 are provided on the reference color plate 15.

Grooves 20 and 21 are formed on both sides of the stage 11, and the legs of the gate-shaped Y-direction moving body 22 are fitted in the grooves 20 and 21, respectively. The Y-direction moving body 22 is intermittently fed along the grooves 20 and 21 in the Y direction by a constant pitch. In addition, the moving body in the Y direction
An X-direction moving body 24 is fitted in a groove 23 extending in the X-direction, and the X-direction moving body 24 continuously moves along the groove 23 in the X-direction. The X-direction moving body 24 has a photometric head.
25 is attached, moves on the pressure recording sheet 12 in a two-dimensional direction, and measures a portion that develops a magenta density according to the pressure value.

The operation panel 28 is provided with four moving keys 29 for moving the photometric head 25 in four directions. Further, the operation panel 28 has an automatic / manual switching key 30 for selecting the automatic measurement mode and the manual measurement mode, an LED 31 for displaying the manual measurement mode, and a manual measurement key for performing the manual measurement.
32, Display 33 that digitally displays the measured concentration value 33
Is provided.

The scanner 10 is connected to the personal computer 35, starts density measurement according to an instruction from the personal computer 35, and sends the obtained measurement data and position data representing the density measurement position to the personal computer 35. The keyboard 36 is used for designating a measurement mode and a display mode and inputting data necessary for pressure conversion. A system diskette 38 storing a measurement program is inserted into the disk drive 37, and a data diskette (not shown) for storing measurement data is inserted into the disk drive 39.

The personal computer 35 converts the density value into a pressure value and colors it according to the range of the pressure value to create a color image. This color image is displayed on the color monitor 40 and is printed out on the recording paper 42 by the color printer 41.

FIG. 2 shows the structure of the photometric head. A bottom plate 45 is fixed to the lower portion of the photometric head 25, and a measurement aperture 45a is formed on the bottom plate 45. A light-shielding tube 46 of a light projecting system is arranged at an angle of 45 degrees with respect to the measurement aperture 45a, and a lamp 47 is housed therein.
In this light projecting system, the speed of light of the illumination light emitted from the lamp 47 is regulated by the opening formed at the tip of the light shielding tube 46, and the pressure recording sheet 12 located in the measurement aperture 45a is illuminated in spots. To do.

The light-shielding tube 4 is placed so as to face the measurement aperture 45a.
8 is arranged vertically, and the lens 49 is accommodated in this. In this reflected light measurement system, the light reflected on the surface of the pressure recording sheet 12 located in the measurement aperture 45a is regulated by the opening provided at the tip of the light shield 48, and the lens 49 and the color filter 50. The light then enters the light receiving element 51 and is photoelectrically converted there.

The reference light measuring system includes a light-blocking tube 52 communicating with the light-blocking tube 46, a color filter 50, and a light-receiving element 53.
Part of the illumination light emitted from
Photoelectric conversion with.

The color filter 50 is for transmitting only reflected light in a specific wavelength range, and in this embodiment, a green filter is used to measure the density of magenta color development. When measuring the black and white density, the color filter 50 is not necessary, and if the filter 50 is replaceable, the three color densities can be measured respectively.

The X-direction moving body 24 is guided by a pair of guide rods 55, and is moved in the X-axis direction by the X-direction moving mechanism 56.
This X-direction moving mechanism 56 is, as is well known, an X-direction moving body.
It is composed of a tow thread whose both ends are connected to 24 and a pulse motor for moving the tow thread. Similarly, the Y-axis direction moving body 22 is also driven by the Y-axis direction moving mechanism 57 and moves in the Y direction along the guide rod.

FIG. 3 shows the electrical configuration of the present invention. Light receiving element
The signals output from 51 and 53 are sent to logarithmic exchange amplifiers 60 and 61, respectively, where they are amplified and logarithmically converted. The output signals of the logarithmic conversion amplifiers 60 and 61 are subjected to subtraction processing by the subtractor 62 and converted into density signals. This concentration signal is sent to the A / D converter 63, sampled at a predetermined cycle, converted into a digital signal (measurement data), and sent to the I / O port 64. In the automatic measurement mode of the scanner 10, the position data indicating the coordinate position of the measuring head 25 and the measurement data obtained by measuring at this coordinate position are sent to the personal computer 35 via the I / O port 64. In the manual measurement mode of the scanner 10,
The density value at the designated coordinate position is displayed on the display 33. The CPU 65 outputs the position data of the photometric head 25 and controls the respective parts in sequence according to the program stored in the memory 66.

The motor controller 67 is for controlling the pulse motor 68 of the X-axis direction moving mechanism 56, and the motor controller 69 is for controlling the pulse motor 70 of the Y-direction moving mechanism 57. The driver 71 is for turning on the lamp 47.

As is well known, the personal computer 35 has an I / O port 75 and a keyboard 3.
6, CPU76, ROM78, RAM79, disk drive 37, 39. In addition to controlling the operation of the scanner 10, the personal computer 35 takes in the measurement data and position data sent from the scanner 10 into the CPU 76 and writes them in the RAM 79. On the other hand, the film type and temperature / humidity are entered from the keyboard, and one data curve of the temperature / humidity conditions shown in FIG. 5 is selected by calculation, and environment classification correction data as shown in FIG. 6 is set. Then, the data of the concentration / pressure curve suitable for the environment classification is selected, and the concentration value is converted into the pressure value with reference to this. The ROM 78 also stores a measurement condition setting program, a measurement procedure program, a pressure conversion calculation program, and the like.

FIG. 4 is a functional block diagram of a personal computer regarding density conversion and color display. The measurement data from the scanner 10 is stored in the storage unit 85, which is a part of the RAM 79, using the position data as an address. After this storage, the environment classification determination unit 86
The concentration value is converted into a pressure value by the pressure conversion unit 87 with reference to the concentration / pressure curve selected in step S1, and is calibrated by the zero point correction data of the zero point correction unit 88. This zero point correction data is created by measuring the color reference plate 15 prior to scanning. The calibrated pressure value is stored in the memory section 8 which is part of the RAM79.
Once stored in 9 and written to the data diskette 90 as needed. The pressure value read from the storage unit 89 is exchanged for color data by the coloring unit 91 according to the pressure range and sent to the color monitor 40. Here, the color assigned to each pressure range is designated by the color designation unit 92.

Next, the operation of the above embodiment will be described. scanner
When the power switch 10 is turned on, the Y-direction moving body 22 and X
The directional moving body 24 returns to the home position where the reference color plate 15 is located.

Next, the right end of the transparent cover 13 is lifted, the pressure recording sheet 12 is set on the stage 11, and the transparent cover 13 holds the pressure recording sheet 12 flat. When performing automatic measurement, set the automatic / manual switching key 30 to the automatic measurement side. In this automatic measurement, the LED 31 lights up.

When the system diskette 37 is loaded after turning on the power switch of the personal computer 35, the color monitor 40 displays a menu of "automatic measurement mode" and "manual measurement mode". When the automatic measurement mode is selected, the data input menu is displayed.
Enter the temperature, humidity and scan range respectively. Here, the temperature and humidity are standard values such as “23 ° C” and “65%” in advance.
Since "RH" has been entered, in other cases, operate the numeric keys to enter the actual value. Further, the scan range can be designated by referring to the scale provided on the edge of the transparent cover 13. Enter the type of pressure recording sheet according to the number displayed on the monitor.

When the keyboard 36 is operated to instruct the PC 35 to start scanning, the operation of the scanner 10 starts. First, CPU6
5 turns on the lamp 47 via the driver 71. At the same time, prior to the measurement of the pressure recording sheet 12, the reference color plate 15 is measured to create zero point correction data. When creating the zero-point correction data, the CPU 65 sends a rotation command to the motor controller 67 to rotate the pulse motor 68 and continuously move the X-direction moving body 24 in the X-direction. When the X-direction moving body 24 starts from the home position and moves in the X-direction, the photometric head 25 sequentially measures the white mark 17 and the red mark 16. At the time of this photometry, the illumination light emitted from the lamp 47 is made into spot light by the light shielding tube 46 and then passes through the measurement aperture 45 to illuminate the pressure recording sheet 12 on the spot. The light reflected by the pressure recording sheet 12 passes through the measurement aperture chair 45a and enters the light shielding tube 38, and passes through the lens 49 and the color filter 50 to receive the light receiving element 5
It enters 1 and is photoelectrically converted here. On the other hand, a part of the illumination light emitted from the lamp 47 is taken out as a reference light through the light shielding tube 52, passes through the color filter 50, and then the light receiving element.
It is incident on 53 and is photoelectrically converted here.

The signals output from the light receiving elements 51 and 53 are logarithmically converted and amplified by logarithmic conversion amplifiers 60 and 61, and then sent to a subtractor 62, and the difference between them is output as a density signal. CPU65 is A
The / D converter 63 is driven at a predetermined cycle to sample the density signal and convert it into a digital signal. The digitally converted measurement data is sent to the personal computer 35 via the I / O port 64. Further, the CPU 55 sends the position data of the photometric head 25 to the personal computer 35.

The personal computer 35 writes the measurement data and position data of the scanner 10 in the storage unit 85. The zero point correction unit 88 indicates that the current metering is marked with a red mark from the position data of the metering head 25.
It is determined whether it is 16 or white mark 17. And
With the concentration value obtained by actually measuring these marks 16, 17,
Zero-point correction data (constant term, coefficient term) is created from a predetermined deviation in density value.

When the creation of the zero-point correction data is completed, the CPU 65 reverses the pulse motor 68 via the motor controller 67 to return it to the origin position in the X direction, and also rotates the pulse motor 70 by a fixed amount via the motor controller 69. The pulse motor 70 moves the Y-direction moving body 22 to the scan start position in the Y direction. Next, since the pulse motor 68 rotates, the photometric head 25 starts moving from the scan start position in the X direction. When the photometric head 25 continuously moves in the X direction, the magenta color density of the pressure recording sheet 12 is measured, and the obtained measurement data and the position data of the photometric head 25 are sent to the personal computer 35. When the photometric head 25 moves to the end, the pulse motor 68 rotates in the reverse direction and the pulse motor 70 rotates by a fixed pitch to intermittently feed the Y-direction moving body 22. The photometric head 25 alternately feeds in the X direction and in the Y direction, thereby two-dimensionally scanning the pressure recording sheet 12.

When the photometry of the scanner 10 ends, the pressure value conversion unit 87 converts the concentration value of each measurement point read from the storage unit 85 into a pressure value with reference to the concentration / pressure curve designated by the environment classification determination unit 86. That is, the environment classification determination unit 86 determines the environment classification by referring to the curve diagram data. For example, the temperature is 20 ℃
When the humidity is 63% RH, it is determined that the environment classification is the B zone, as shown in FIG.

The pressure value conversion unit 87 selects the correction data of the concentration / pressure curve corresponding to this environment classification. In this example, since the environment classification is “B”, the data of the concentration / pressure curve B shown in FIG. 6 is selected. Further, the pressure value conversion unit 87 uses the zero point correction data of the zero point correction unit 88 to determine the lamp 47 and the logarithmic amplifier 6.
The correct pressure value is obtained by correcting the fluctuations of 0, 61, etc., and the calibrated pressure value is stored in the storage unit 89.

After capturing the calibrated measurement data, the display mode selection menu is displayed on the color monitor 40. This menu has a total pressure range display and an individual pressure range display. When the full pressure range display is selected here, the pressure value at each measurement point is read from the storage unit 89 and sent to the coloring unit 91. The coloring unit 91 converts the pressure value into a color according to the range and creates a color image. The data of this color image is sent to the color monitor 40, and a color image as shown in FIG. 7 is displayed. This FIG. 7 shows the pressure distribution of the gasket of the engine body, and is shown in the white area.
95 represents less than 15 kg / cm ^{2 and} is a yellow area represented by dots
96 represents less than 15~30kg / cm ^2, green area in terms of cross-hatching represents less than 30~45kg / cm ^2, also red area 98, represented by hatching represents a 45 kg / cm ² or more . In addition to the color image, the relationship between the display color and the pressure range, the measurement date, the measurement conditions (temperature, humidity), etc. are displayed. Although the pressure range has four stages in this embodiment, it may have three stages, five stages, six stages, or the like.

A menu regarding whether or not a hard copy is made is also displayed on the color monitor 40. Therefore, when the number of this menu is entered, the color printer 41 is activated to print a color image and measurement conditions on the recording paper 42. . A data storage menu is also displayed. If you point to this, the pressure value stored in the storage unit 89 will be displayed on the data diskette 90.
Written in. Also, in the full pressure range display mode,
A single color display mode is prepared, and when a color of a pressure range to be displayed is selected, a color image colored in this pressure range portion is displayed. If the color of the pressure range to be displayed next is designated, the part of this pressure range is colored and displayed on the color monitor 40 together with the color already displayed. It If this designation is sequentially performed and all the pressure ranges are designated, the same color image as the full pressure range display is displayed.

When the individual pressure range is selected in the display mode selection, each pressure range and its color are displayed, so that the number of the color to be displayed is designated. In this case, the area of the designated pressure range is displayed in the designated color, and other than that, the color image displayed in blue, for example, is displayed on the color monitor 40. Next, if another pressure range is designated, only the area of this pressure range is displayed in the designated color.

Also, when the manual measurement mode is selected, the data input menu is displayed, so that the measurement conditions and the like are input as described above. Next, the coordinate value input mode and the cursor display mode are displayed on the color monitor 40. For example, by selecting the coordinate value input mode and then operating the keyboard 36 to specify the coordinate position of the measurement point, the pulse motor 68 or 70
Rotates, and the photometric head 25 moves to the designated position.
The density value measured at this position is the personal computer as described above.
It is converted into a pressure value at 35 and displayed as a number on the color monitor 40. Further, if the cursor input mode is designated, a cross cursor is displayed on the color monitor 40. Then, the move key of the keyboard 36 is operated to move the cross cursor to the position to be measured. Since the photometric head 25 moves together with the cross cursor, the keyboard 36 can be moved to a desired position.
When the return key of is operated, the density value at this position is measured and displayed on the color monitor 40 as a pressure value.

Further, the scanner 10 can be used to perform density measurement at any position. In this case, the automatic / manual switching key 30 is operated to set the manual measurement side. If the move key 29 is operated after confirming that the LED 31 is off, the pulse motor 68 or 70 will rotate, so the photometric head
25 can be moved to a desired position. Next, when the manual measurement key 32 is operated, the density at this position is measured, and the density value is displayed on the display 33 as a number.

Although one type of pressure recording sheet has been described in the above embodiment, in practice, four types of pressure recording sheets for high pressure, medium pressure, low pressure and ultra low pressure are used.
Since there are different types, the temperature / humidity condition diagram data and the concentration / pressure curve diagram data for each pressure recording sheet are set as correction data that is selected by calculation based on the data entered from the keyboard. , The concentration and pressure curves are different. Therefore, it is advisable to combine this measuring method with the type of pressure recording sheet to form, for example, a high pressure instantaneous pressure recording sheet or a high pressure continuous pressure recording sheet, and divide these data into channels.

Further, in the above-mentioned embodiment, each measurement point is measured once, but if the same measurement point is measured a plurality of times and the average value thereof is used, more accurate measurement can be performed. .

〔The invention's effect〕

As described in detail above, according to the present invention, the optimum concentration / pressure curve is selected according to the environmental classification determined from temperature and humidity. Then, the pressure recording sheet is two-dimensionally scanned to check the density at each measurement point, converted to a pressure value with reference to the density / pressure curve, and colored according to the range of the obtained pressure value to color. Since it is displayed on the monitor, the pressure distribution recorded on the pressure recording sheet can be measured easily and accurately, and the state of the pressure distribution can be identified at a glance. Further, since a color printer is provided, the color image displayed on the monitor can be easily converted into a hard copy.

[Brief description of drawings]

FIG. 1 is an external view of the pressure distribution measuring device of the present invention. FIG. 2 is a sectional view of the photometric head. FIG. 3 is a block diagram showing the electrical configuration of the present invention. FIG. 4 is a functional block diagram of pressure conversion and coloring. FIG. 5 shows an example of a temperature / humidity condition diagram. FIG. 6 shows an example of a concentration / pressure curve diagram. FIG. 7 is an explanatory diagram showing an example of a color image displayed on the color monitor. 10 …… Scanner 11 …… Stage 12 …… Pressure recording sheet 13 …… Transparent cover 22 …… Y direction moving body 24 …… X direction moving body 25 …… Metering head 35 …… Computer 36 …… Keyboard 40 …… Color Monitor 41 …… Color printer 47 …… Lamp 51,53 …… Light receiving element 60,61 …… Logarithmic conversion amplifier.

 ─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-1-134220 (JP, A) JP-A-59-192933 (JP, A) JP-A-57-192537 (JP, A) Actual development Sho-63- 51233 (JP, U)

Claims (2)

[Claims] 1. A scanner for moving a photometric head to two-dimensionally scan a pressure recording sheet to measure a density value color-recorded on the pressure recording sheet, and a temperature when the pressure recording sheet is color-recorded. 1 corresponding to the determined environmental classification from a plurality of concentration / pressure curves representing the relationship between concentration and pressure
In addition to selecting one, referring to the selected concentration-pressure curve, a pressure value conversion unit for converting the concentration value at each point measured by the scanner into a pressure value, and a color image colored according to the pressure value range. And a color printer that outputs a hard copy of the color image. 2. The pressure distribution measuring device according to claim 1, wherein the pressure recording sheet is pressed from above by a transparent cover, and the photometric head moves on the transparent cover.