JP4511202B2 - Optical identification device - Google Patents

Description

  The present invention receives the reflected light and / or transmitted light of the light irradiated to the object to be identified, and compares the data based on the scanning pattern of the received light with predetermined collation data to identify the object to be identified. The present invention relates to an optical identification device.

  A banknote identification device as a conventional optical identification device is described in Patent Document 1. The banknote identification device described in Patent Literature 1 includes a light source that irradiates light onto an inspection surface of a bill to be conveyed, and a light receiving unit (optical sensor) that receives reflected light from the inspection surface and converts it into an electrical signal. A detection unit that detects an output pattern of an electric signal unique to a bill by scanning the inspection surface of the bill, and a determination unit that identifies the bill by comparing the output pattern detected by the detection unit with a standard output pattern stored in advance. (Refer to claim 1, FIG. 1).

  In a conventional banknote recognition device, generally, a standard output pattern (collation data) and a scanning pattern are determined from a longitudinal edge by guiding the longitudinal edge of the banknote to position the banknote and using the longitudinal edge as a reference. An electrical signal is used when light is scanned on a straight line that is separated by a distance and parallel to the longitudinal edge.

Here, banknotes are generally manufactured by cutting a plurality of sheets on a large sheet of paper, and then cutting the sheet into a printing position on the large sheet (variation). ) May occur, or the cutting position may be displaced (varied) during the cutting process.
As described above, in the banknote identification device, the scanning position of the irradiation light is determined based on the long edge of the banknote. Therefore, if the banknote has a printing position variation due to a printing deviation or a cutting deviation, Since the printing pattern changes, there is a high possibility that a real banknote (genuine bill) will be mistakenly recognized as a counterfeit banknote. However, since the banknotes issued in Japan have very small variations in printing positions, The banknote identification is easy, and this is one of the reasons why a banknote identification apparatus with a low misidentification rate has been developed and spread in Japan.

  However, in recent years, the need for banknote recognition devices has increased in foreign countries, and Japanese manufacturers with a rich track record of developing banknote recognition devices are expected to develop highly accurate banknote recognition devices with a low false positive rate. Among them, there is a very large variation in the printing position, about 4 mm at the maximum, compared to Japanese banknotes. In such a banknote, the printing pattern on the scanning trajectory is different for each banknote, and accurate identification cannot be performed.

Therefore, as a discriminator for banknotes with large variations in printing position, a plurality of sets of light sources and light receiving units are arranged in a direction orthogonal to the scanning direction, and data based on scanning patterns detected from the plurality of light receiving units is stored respectively. There are also banknote recognition devices that have been devised such as adopting data that is close to a standard output pattern (collation data) among stored data.
JP 2001-209839 A

  However, in the above-described conventional banknote recognition apparatus with the increased number of light sources and light receiving units, the addition of an electric circuit, the addition of a memory for storing data of a plurality of scanning patterns, and control software according to the number of light sources and light receiving units This complicates and enlarges the data comparison program in Eware, and there is a problem that the apparatus becomes large and the cost increases.

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to perform accurate identification even for an object to be identified such as a banknote having a large variation in printing position, and further, a light source, a light receiving unit, an electric circuit, It is an object of the present invention to provide an optical identification device having a simple configuration that does not require addition of memory, complicated control software, etc., and does not increase the size or cost of the device.

In order to solve the above problems, an optical identification device according to the present invention has the following configuration. That is, a light source that irradiates light to the object to be identified, a moving unit that relatively moves the object to be identified and the light source in a state where light from the light source is irradiated to the object to be identified, and an object to be identified. By receiving reflected light and / or transmitted light of the received light and converting the scanning pattern of the received light into data, and comparing the data converted by the light receiving conversion means with predetermined collation data In the optical identification device including the identification unit for identifying the identification target, the scanning width of the irradiation light from the light source at the position irradiated to the identification target is larger than the width of the irradiation light in the scanning direction. A condensing part that condenses the light source light is provided so as to be wide, and the condensing part is composed of two conical parts joined with the tip ends of the conical parts facing each other. Features.
According to this, by condensing the light diffused in the scanning direction in the conventional apparatus in the scanning direction by the condensing unit, the amount of light at the longitudinal edge portion of the scanning trajectory of the irradiation light is increased and the scanning width is widened. Therefore, it is possible to obtain a scanning pattern of a scanning trajectory including a trajectory close to the scanning trajectory even for an identification object having a large deviation from the scanning trajectory on which the collation data is based, such as a bill having a large printing / cutting deviation. And the false positive rate can be reduced. Further, since the width of the irradiation light in the scanning direction becomes narrow, the resolution of the scanning pattern in the scanning direction can be kept high.

Further, the condensing section is characterized by mutual slopes of the two conical portions is formed to be continuous smoothly.
According to which this, the illumination light, can also be condensing or diffusing in a direction perpendicular to the scanning direction, the adjustment range of the irradiation light is spread, thereby enabling tuning to a more precise optical identification device.

Further, the condensing part is integrally formed with a holder part that can be attached in the vicinity of the light source.
According to this, the condensing unit can be easily attached to and detached from the vicinity of the light source.

Further, the identification means compares the data converted by the light receiving conversion means with collation data based on reflected light and / or transmitted light of a light scanned on a specific part of the banknote, so that the object to be identified is a banknote. It is characterized by identifying whether it is.
According to this, even if the object to be identified has a large printing / cutting misalignment, the misperception rate can be lowered.

  According to the optical identification device according to the present invention, even an object to be identified such as a banknote having a large variation in printing position can be accurately identified, and can be easily configured, such as a light source, a light receiving unit, an electric circuit, There is no need for additional memory, complicated control software, and the like, and there is an effect that the apparatus is not increased in size and cost.

  The best mode for carrying out an optical identification device according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram showing a configuration of a banknote recognition apparatus 10 as an embodiment of an optical identification apparatus according to the present invention.
Inside the apparatus main body 12 of the banknote recognition apparatus 10, a banknote 16 as an identification object input from an input port 14 provided in the apparatus main body 12 is provided along the transport path A in the apparatus main body 12. A transport mechanism 20 is provided as a moving means for transporting the stocker 18.

  The outline of an example of the transport mechanism 20 will be described. The feed belt 22 is arranged in two rows in parallel between the first pulley 24 on the insertion port 14 side and the second pulley 26 disposed on the back side of the apparatus main body 12. It is stretched over. The second pulley 26 is rotationally driven by an electric motor (not shown). A receiving roller 28 is disposed between the first pulley 24 and the second pulley 26 so as to be rotatable about the axis. The first pulley 24 and the receiving roller 28 are respectively opposed to pressing rollers 30a and 30b. Between the pressing roller 30a and the first pulley 24, between the pressing roller 30b and the receiving roller 28, The feed belt 22 is clamped. A reversing guide 32 having a semicircular cross section is disposed in a state where a gap is formed between the second pulley 26 and the side surface of the second pulley 26 facing the back side of the device main body 12 so that the bill 16 can enter. Has been.

  The stocker 18 is for accommodating the banknote 16 sent into the banknote identification device 10.

The detection part 34 is arrange | positioned at the test | inspection surface 16a side of the banknote 16 conveyed along the conveyance path A. FIG.
Enlarged views of the detection unit 34 are shown in FIGS. 2 is an enlarged view of the detection unit 34 as viewed from the side of the transport path A, that is, from a direction orthogonal to the transport direction (scanning direction), as in FIG. FIG. 3 is an enlarged view of the detection unit 34 as viewed from the insertion port 14 side, that is, from the back in the transport direction (scanning direction).
The detection unit 34 includes a light source 36 that irradiates light onto the inspection surface 16a, and a light receiving unit 38 that receives reflected light from the inspection surface 16a and converts it into an electrical signal. The light source 36 and the light receiving unit 38 are provided at a position approximately 1 mm away from the bill 16 and arranged in a direction orthogonal to the conveyance direction (scanning direction) of the bill 16.
The light receiving unit 38 is arranged on the opposite side of the light source 36 across the banknote 16 (upper side of the banknote 16 in the figure) so that the transmitted light of the light irradiated from the light source 36 onto the banknote 16 can be received. Also good.

  As an example, the light source 36 can be composed of a light emitting diode and a transistor as a driving unit for causing a current to flow through the light emitting diode. With this configuration, by controlling the base current supplied to the transistor, the current flowing to the collector side of the transistor, that is, the current flowing to the light emitting diode can be controlled, and the light amount of the light emitting diode can be controlled. In addition, it is also possible to use semiconductor elements, such as FET, instead of a transistor.

For example, the light receiving unit 38 can be configured by a photosensor that converts received light into an electrical signal.
The light receiving unit 38 is connected to an A / D (analog / digital) converter 39 shown in FIG. The A / D converter 39 converts the output pattern of the electric signal as an analog signal into digital data, and transmits the digital data to the control unit 33 described later.
That is, the light receiving unit 38 and the control unit 33 constitute light receiving conversion means for receiving the reflected light of the light irradiated on the banknote 16 and converting the received light pattern into data.

  With the above configuration, the banknote 16 is moved relative to the light source 36 by transporting the banknote 16 by the transport mechanism 20 while the banknote 16 is irradiated with light from the light source 36, and the banknote 16 is irradiated with light. And the light receiving unit 38 and the A / D converter 39 can receive the reflected light of the irradiated light and convert the scanning pattern of the received light into digital data.

As shown in FIGS. 2 and 3, the main body 34 a of the detection unit 34 includes a cylindrical lens 40 as a condensing unit, and the light source 36 and the light receiving unit 38 between the light source 36 and the light receiving unit 38 and the banknote 16. It is attached to cover. The cylindrical lens 40 is disposed so that its axis is orthogonal to the scanning direction and parallel to the inspection surface 16a of the bill 16. The cylindrical lens 40 extends from the side in the axial direction toward the side wall of the detection unit main body 34a, and is attached to the detection unit main body 34a by a holder portion 40a formed so as to be able to hold the detection unit main body 34a from both sides. .
An external view of the cylindrical lens 40 is shown in FIG. 4A is a perspective view of the cylindrical lens 40, FIG. 4B is a plan view, FIG. 4C is a side view, and FIG. 4D is a front view.
The cylindrical lens 40 and its holder portion 40a are integrally formed of a transparent resin such as acrylic. Of course, the material of the cylindrical lens 40 and the holder part 40a is not limited to resin such as acrylic, and for example, glass may be used.

  As shown in FIG. 2, the cylindrical lens 40 as a condensing unit condenses the irradiation light from the light source 36 so as to suppress diffusion in the conveyance direction of the bill 16. On the other hand, as shown in FIG. 3, the cylindrical lens 40 does not significantly affect the light that diffuses in the direction orthogonal to the conveyance direction of the banknote 16.

  The shape of the image of the irradiation light from the light source 36 in the position irradiated to the banknote 16 by the banknote identification device 10 which concerns on this Embodiment, and the conventional banknote identification device is typically shown in FIG.

  Since the irradiation light to the banknote 16 by the conventional banknote identification apparatus diffuses uniformly in all directions with respect to the banknote 16 surface, the image is circular as shown in b. In a conventional Japanese banknote recognition apparatus, the image b is often about 1 to 2 mm in diameter, that is, the scanning width Wb is about 1 to 2 mm.

On the other hand, in the banknote identification device 10 according to the present embodiment, the cylindrical lens 40 as the light collecting unit condenses the light source light in the scanning direction as described above. Thereby, as shown in FIG. 5, in the banknote identification device 10 according to the present embodiment, the image a of the irradiation light at the position irradiated on the banknote 16 is wider in the scanning direction than the conventional image b. As it becomes narrower, the amount of light increases. Furthermore, the light of the area | region c which was disperse | distributed and weakened with the conventional banknote identification device, and did not form an clear image is condensed in the scanning direction by the cylindrical lens 40 (arrow), and it becomes an intense light and forms an image The length of the image a in the direction orthogonal to the scanning direction (scanning width Wa) is longer than that of the image b.
That is, the cylindrical lens 40 condenses the light source light so that the scanning width Wa of the irradiation light from the light source 36 at the position where the banknote 16 is irradiated is wider than the width L in the scanning direction of the irradiation light. .

  In the case where the cylindrical lens 40 having a diameter of about 2 mm and an axial length of about 3 mm is used, the applicant of the present application has a length (scanning width Wa) in a direction perpendicular to the scanning direction of the visible image a. ) Was about 4 mm.

  The control unit 33 includes a CPU, a storage unit such as a ROM and a RAM, and operates according to a program stored in advance in the ROM or the like, and functions as a control microcomputer unit that performs overall control of the banknote recognition apparatus 10. Specifically, the detection unit 34 and the transport mechanism 20 are controlled to read / write data from / to the storage unit. The control unit 33 also functions as an identification unit that identifies the banknote 16 by reading the digital data based on the output pattern detected by the detection unit 34 and comparing it with the collation data measured in advance and stored in the storage unit. To do.

In this collation data creation (determination) technique, first, a number of banknotes are inserted from the insertion slot 14 using the banknote recognition apparatus 10 having this configuration. The banknote recognition device 10 guides the longitudinal edge of the banknote 16 to position the banknote 16, and the light source 36 disposed at a predetermined distance from the longitudinal edge with respect to the longitudinal edge serves as a reference to the longitudinal edge. While scanning light on parallel straight lines, the light receiving unit 38 and the A / D converter 39 convert the received light scanning pattern into digital data and store it in the storage unit. Next, the data of each scan pattern stored in the banknote is statistically processed, and the average scan pattern data and the standard range data for discriminating it from a genuine note in consideration of variations in the scan pattern data, etc. The average scan pattern data and the standard range data are combined and used as collation data as a whole.
The collation data is created in advance at the stage of development of the banknote recognition device 10, and is stored in a storage unit such as a ROM when the banknote recognition device 10 enters the market.

  Next, the identification operation of the banknote identification device 10 will be described with reference to FIG. First, when the power is turned on, the control unit 33 initializes each component (step 202). Then, the control unit 33 waits for the bill 16 to be inserted into the insertion slot 14 (step 204).

  Next, when the banknote 16 is inserted into the insertion slot 14, the control unit 33 detects the insertion of the banknote via an insertion detection sensor (not shown), operates the transport mechanism 20, and is inserted into the insertion slot 14. The banknote 16 is conveyed to the inside of the apparatus main body 12 and the longitudinal edge of the banknote 16 is guided to position the banknote 16, and the detection unit 34 scans the straight line separated from the longitudinal edge of the banknote 16 by a predetermined distance. The scanning pattern specific to the bill 16 is collected and converted into digital data by the A / D converter 39, and the digital data is stored in the storage unit (step 206). Further, the control unit 33 completes the scanning, that is, after the rear end side in the conveyance direction of the banknote 16 (the end in the direction of the insertion slot 14) crosses the detection position (light irradiation position) by the detection unit 34. Stop the banknotes. Next, the CPU of the control unit 33 operates as the identification unit, compares the scan pattern data stored in step 206 with the verification data stored in advance in a storage unit such as a ROM, and identifies the banknote 16. Perform (step 208).

If the data of the scanning pattern of the banknote 16 is different from the collation data as a result of identification, it is determined that the inserted banknote 16 is fake, and the return routine of step 210 is executed. Specifically, in this return routine, the control unit 33 operates the transport mechanism 20 to transport the banknote 16 to the insertion slot 14 and discharges it from the slot 14 (the end of the banknote 16 protrudes from the slot 14). It is also included in the discharge referred to here to be transported to a stopped state and stopped.)
On the other hand, when it is determined in step 208 that the data of the scan pattern of the banknote 16 is the same as the collation data and the inspected banknote 16 is a genuine note, the adoption routine of step 212 is executed. Specifically, in this adoption routine, the control unit 33 controls the transport mechanism 20 to further transport the banknote 16 in the back direction of the apparatus main body 12 and finally accommodate it in the stocker 18.
The above is the operation of the banknote recognition apparatus 10.

In the conventional banknote identification device, as shown in FIG. 5, the irradiation light (image b) from the light source at the position where the banknote 16 is irradiated was circular. In this case, if the image b is too large, the resolution in the scanning direction cannot be ensured and the accuracy of the detected scanning pattern is reduced. Conversely, if the image b is too small, the short direction of the banknote 16 (perpendicular to the transport direction). The problem arises that it is not possible to cope with variations in the printing position in the (direction).
In the case of Japanese banknotes, the variation in printing position is small, so it is thought that light with a diameter of about 1 to 2 mm was able to sufficiently cope with the variation in printing position. There is also a variation in printing position of about 4 mm. With a scanning width of about 1 to 2 mm in diameter, the scanning location is completely deviated for each banknote, and even if it is a genuine note, the variation in the scanning pattern is large and accurate. Identification cannot be performed. However, if the diameter of the image b is increased, the resolution in the scanning direction cannot be ensured, so that the accuracy of the detected scanning pattern is lowered, and eventually high-precision identification cannot be performed. Therefore, in the conventional banknote identification device for foreign banknotes, it is necessary to provide a plurality of detection units.
Moreover, some foreign banknotes have a light-shielding part that does not transmit light, such as a metal foil, in part of the banknotes, and the banknotes may be identified using a scanning pattern (presence / absence pattern) of transmitted light of banknotes. is there. In this case, for example, if the length in the scanning direction of the light shielding part of the banknote (or the gap in the scanning direction between the light shielding parts) is shorter than the width in the scanning direction of the image of the irradiation light, the light shielding parts (or between the light shielding parts). (Gap) may not be detected.

  On the other hand, according to the banknote identification apparatus 10 which concerns on this Embodiment, as shown in FIG. 5, the irradiation light (the image a) from the light source in the position irradiated to the banknote 16 is the conventional banknote identification apparatus ( In comparison with the image b), the scanning width Wa becomes wider, the width of the irradiation light in the scanning direction becomes shorter, and the amount of light increases.

The inventor of the present application condenses the light source light so that the length (scanning width Wa) in the direction orthogonal to the scanning direction of the visible image a is about 4 mm as in the optical identification device of the present invention. It was confirmed that if the number 16 was irradiated, the misidentification rate of banknote identification was greatly reduced.
This is because the resolution in the scanning direction can be sufficiently maintained since the width L in the scanning direction is small, and the variation in the printing position in the direction orthogonal to the scanning direction is close to 4 mm because the scanning width Wa is expanded to about 4 mm. Even if it exists, it is thought that the scanning pattern in the position including the scanning position used as the reference | standard of collation data can be light-received by the light-receiving part 38, the misidentification rate of banknote identification can be suppressed, and highly accurate identification can be performed. . Further, since the resolution in the scanning direction is high, the light shielding part can be detected more reliably even when the length of the light shielding part of the banknote in the scanning direction (or the gap between the light shielding parts) is short.
In addition, it is considered that a clearer scanning pattern can be obtained (received by the light receiving unit 38) and the identification can be performed with higher accuracy by increasing the amount of light by condensing.

Furthermore, the banknote identification apparatus 10 which concerns on this Embodiment is realizable with the very simple structure which attaches the cylindrical lens 40 between the light sources of the conventional banknote identification apparatus between banknotes. Accordingly, it is not necessary to add a light source, a light receiving unit, an electric circuit or a memory, or to complicate control software, so that the apparatus is not increased in size and cost.
In addition, the cylindrical lens 40 according to the present embodiment has the holder portion 40a integrally formed and can be attached more easily, and can be manufactured at a lower cost compared to the case where other attachment means are prepared. .

Moreover, as shown in FIG. 3, in the banknote recognition apparatus according to the present embodiment, the cylindrical lens 40 also covers the light receiving unit 38.
Therefore, as shown in FIGS. 2 and 3, the light receiving unit 38 also receives light in a narrower range in the scanning direction (conveying direction) of the bills 16 (FIG. 2), and the direction orthogonal to the scanning direction is in a wider range. Light can be received (FIG. 3). Therefore, the light-receiving side can maintain a sufficiently high resolution in the scanning direction, and is less susceptible to variations in the printing position in the direction orthogonal to the scanning direction, further reducing the misidentification rate of banknote identification and highly accurate identification. It can be performed.
However, the cylindrical lens 40 may cover only the light source 36 and not on the light receiving unit 38.
Further, another cylindrical lens may be arranged on the light receiving unit 38.

  In addition, the shape of the cylindrical lens of the present invention is not necessarily limited to a true cylinder, and includes, for example, an elliptical cylinder, a semi-cylindrical cylinder, a cylindrical lens partially deformed such as flat.

Further, instead of the cylindrical lens 40 as the light condensing unit in the present embodiment, the scanning width of the irradiation light from the light source 36 at the position where the bill 16 is irradiated is wider than the width of the irradiation light in the scanning direction. A slit portion that restricts transmission of the light source light may be employed. The slit portion is configured by forming an elongated slit in a member that does not transmit the light source light of the light source 36. The slit portion is arranged between the light source 36 and the light receiving portion 38 and the bill 16 so that the longitudinal direction of the slit is orthogonal to the scanning direction (conveying direction) of the bill 16.
According to this, since the scanning direction (carrying direction) of the banknote 16 can receive light in a narrower range, the resolution in the scanning direction can be increased. Further, since the resolution in the scanning direction is high, the light shielding part can be detected more reliably even when the length of the light shielding part of the banknote in the scanning direction (or the gap between the light shielding parts) is short. Also, if the direction perpendicular to the scanning direction irradiates light over a wider range and is less susceptible to variations in the printing position in the direction perpendicular to the scanning direction, the length of the slit in the direction perpendicular to the scanning direction The length of the irradiation light from the light source 36 may be increased or the amount of light may be increased so that the irradiation range of the irradiation light from the light source 36 toward the bill 16 is increased. By doing so, the scanning width of the irradiation light in the scanning direction is limited to the slit portion and kept small, and the irradiation light is irradiated in a wide range in the direction perpendicular to the scanning direction with high precision, And it becomes possible to recognize the banknote which is hard to be influenced by the dispersion | variation in a printing position.

Moreover, instead of the cylindrical lens 40 of the present embodiment, a conical lens 42 as shown in FIG. The conical lens 42 shown in FIG. 7 is composed of two conical portions joined at the bottom of each other, and is disposed between the light source 36 and the bill 16 so that the axis is substantially perpendicular to the scanning direction and parallel to the bill surface. The
According to the bill discriminating apparatus employing the conical lens 42, the cross-sectional shape in the direction orthogonal to the scanning direction becomes a convex lens shape, and the irradiation light from the light source 36 is collected so as to suppress diffusion in the direction orthogonal to the scanning direction. Can be light. Thereby, compared with the case where the cylindrical lens 40 is employ | adopted, the effect that the light quantity of a light source can be increased while suppressing a scanning width small can be acquired. Therefore, it is preferable to use the conical lens 42 when it is desired to obtain a strong light amount even if the scanning width is somewhat narrow.

The light receiving unit 38 may be disposed at a position for receiving the reflected light that passes through the conical lens 42 among the reflected light of the inspection surface 16a, or is disposed so as to receive the reflected light that does not pass through the conical lens 42. May be.
Further, the shape of the conical lens 42 is not necessarily limited to a strict conical shape, and may be an elliptical cone, a half cone, or a conical lens partially deformed such as flat. Further, the portion of the conical slope may be formed to draw a curve.

  Further, as shown in FIG. 8, a conical lens 44 may be used in which the tip end side of the cone is opposed to and joined to the conical lens 42. According to this, the light can be divided between the one end side and the other end side across the joining portion, and the two light receiving portions 38 and 38 are provided on the other surface side of the bill 16, and one light source 36 It is possible to obtain an effect that the scanning trajectory can be scanned.

  Further, if the inclined surfaces of the two conical portions of the conical lens 44 of FIG. 8 are formed so as to be smoothly continuous, the irradiation light from the light source 36 can be diffused in a direction orthogonal to the scanning direction. Thereby, compared with the case where the cylindrical lens 40 is employ | adopted, a scanning width | variety can be taken larger. Therefore, it is preferable to use the conical lens 44 when, for example, it is desired to identify a bill having a larger variation in printing position.

  Further, for example, when it is desired to receive the transmitted light of the bill 16 of the irradiation light from the light source 36 and the light receiving unit 38 cannot be disposed at the position opposed to the light source 36 due to restrictions such as the shape of the apparatus, FIG. As shown, the light source light can be refracted by one conical lens 46 so that the light can be received by the light receiving unit 38 arranged at a position deviated from the position facing the light source 36. According to this, the freedom degree of arrangement | positioning with the light source 36 of the light source 36 can be raised.

  The present invention is not limited to a bill identifying device, but can be applied to any optical identifying device that receives reflected light and / or transmitted light of light source light and identifies an object to be identified using a scanning pattern of the received light. Is. For example, it can be used for gift certificates, book coupons, other securities, printed matter on which bar codes, characters, etc. are written, and wood grain identification.

It is explanatory drawing which shows the structure of the banknote identification device which concerns on this Embodiment. It is explanatory drawing which looked at the detection part (light source and light-receiving part) from the direction orthogonal to the scanning direction. It is explanatory drawing which looked at the detection part (light source and light-receiving part) from the direction parallel to the scanning direction. It is an external view of a cylindrical lens (condensing part). It is explanatory drawing which shows the shape of the irradiation light from the light source in the position irradiated to a banknote (to-be-identified object). It is a flowchart which shows the flow of banknote identification operation | movement. It is explanatory drawing which shows the example using a conical lens as a condensing part. It is explanatory drawing which shows the example using a conical lens as a condensing part. It is explanatory drawing which shows the example using a conical lens.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Banknote identification apparatus 12 Apparatus main body 14 Insertion port 16 Banknote 16a Inspection surface 18 Stocker 20 Conveying mechanism 22 Feed belt 24 1st pulley 26 2nd pulley 28 Receiving roller 30a Pressing roller 30b Pressing roller 32 Reverse guide 33 Control unit (identification means)
34 detector 34a detector main body 36 light source 38 light receiver (light receiving conversion means)
39 A / D converter (light receiving conversion means)
40 cylindrical lens (condenser)
40a Holder part 42, 44, 46 Conical lens (Condenser part)
A Transport path L Width of irradiation light in scanning direction Wa Scanning width

Claims (4)

A light source for irradiating the identification object with light;
Moving means for relatively moving the object to be identified and the light source in a state where the light from the light source is irradiated on the object to be identified;
A light receiving conversion means for receiving reflected light and / or transmitted light of the light irradiated on the identification object, and converting a scanning pattern of the received light into data;
In an optical identification device provided with identification means for identifying an object to be identified by comparing the data converted by the light receiving conversion means with predetermined collation data,
It has a condensing part that condenses the light source light so that the scanning width of the irradiation light from the light source at the position irradiated to the identification object is wider than the width of the irradiation light in the scanning direction. ,
2. The optical discriminating apparatus according to claim 1, wherein the condensing part is composed of two conical parts joined with their conical tip ends facing each other . The optical discriminating apparatus according to claim 1, wherein the condensing part is formed such that the slopes of the two conical parts are smoothly continuous. The optical discriminating apparatus according to claim 1 , wherein the condensing unit is integrally formed with a holder unit that can be attached in the vicinity of the light source. The identification means compares the data converted by the light receiving conversion means with verification data based on reflected light and / or transmitted light of a light scanned on a specific portion of the banknote, so that the object to be identified is a banknote. The optical identification device according to any one of claims 1 to 3 , wherein the optical identification device is identified.

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