TWI455046B - Counting device and counting method - Google Patents

Description

Counting device and counting method

The present invention relates to a counting device and a counting method for counting stacked object-like objects.

Patent Document 1 discloses a counting device that counts a light-transmitting sheet (film) in a stacked state. The counting device is provided with a first illuminator and a light receiver so as to be adjacent to the corner of the film. As the light receiver, for example, an area image sensor can be employed. Further, in order to improve the detection accuracy of the upper end portion and the lower end portion of the laminated film, the second illuminator and the third illuminator are disposed in the direction in which the film is laminated with the laminated film interposed therebetween.

With such a counting device, the light receiver can detect transmitted light by the arrangement of the first illuminator and the light receiver. Therefore, compared with the case where the reflected light emitted from the object is detected, it is less likely to be affected by the state of the side surface of the light-transmitting sheet, and can be accurately counted (for example, refer to the specification of Patent Document 1 [0024], [0030] [0032] paragraph, Figure 1 and Figure 2).

[Previous Technical Literature] [Patent Document]

Patent Document 1: Japanese Patent Laid-Open Publication No. 2003-44826

However, it is sometimes necessary to use a plate body having a special configuration as an object to be counted, and to count while the plate bodies are in a stacked state. If the board having such a special configuration is counted by the counting means in a general manner, an erroneous count may occur.

It is an object of the present invention to provide a counting device and a counting method capable of improving the counting accuracy of a plate body having a special configuration.

In order to achieve the above object, the counting device of the present invention includes a light source, a sensor, and a processing mechanism.

The light source can illuminate light on a laminate in which a plurality of plates having a light-transmitting layer and a reflective layer are laminated.

The sensor arranges the optical axis of the sensor at a position deviated from the center position in the stacking direction of the stacked body, and receives light transmitted through the laminated body.

The processing means counts the plate body included in the laminated body based on a signal acquired by the sensor.

In the counting method of the present invention, light is irradiated onto a laminate in which a plurality of sheets having a light transmitting layer and a reflecting layer are laminated.

The sensor optical axis is disposed at a position deviated from the center position in the stacking direction of the stacked body, and the sensor receives light transmitted through the laminated body.

The plate body contained in the laminate is counted based on a signal obtained by the sensor.

BD‧‧‧ Blu-ray Disc

Center position in the direction of C‧‧‧z

CD, D (D (1) to D (n)) ‧ ‧ disc

D’‧‧‧Dummy substrate

L(1) to L(N)‧‧‧Light emitted by the light transmission layer

WD‧‧‧Working distance

6‧‧‧Stacking pin

7‧‧‧Support base member

8‧‧‧Disc holder

10‧‧‧Light source

20‧‧‧ Counting objects

21‧‧‧Transparent layer

22‧‧‧reflective layer

22a‧‧‧Deep face

22b‧‧‧ inside

22p‧‧‧Deep

23‧‧‧Low transmittance layer

24‧‧‧ hole

25‧‧‧Laminated body

25a‧‧‧End area

30‧‧‧ camera

30A‧‧‧Sensor optical axis

31‧‧‧ Area Sensor

32‧‧‧ lens

50, 55‧‧ ‧ Processing Department

100, 200‧‧‧ counting devices

Fig. 1 is a perspective view showing a counting device according to a first embodiment of the present invention.

Fig. 2 is a side view showing the counting device shown in Fig. 1.

3A and 3B are side views schematically showing the structure of the plate body.

Figure 4 is a diagram showing the optical settings of the lens and area sensor provided with the camera.

Fig. 5 is a view showing a distortion of an image of a grid line in which vertical and horizontal vertical intersections are caused by distortion caused by a lens of the camera.

Fig. 6 is an image showing a laminate which is photographed by a camera and which is deformed by the influence of distortion caused by a lens.

7A and 7B are views for explaining that the light taken by the camera from the laminated body of the optical disc differs depending on the position of the camera in the z direction.

8A to 8C show counting devices which are different in the arrangement position of the camera with respect to the laminated body.

Fig. 9 is a flow chart showing processing mainly by the processing unit.

Fig. 10 is a view showing an example of an image taken by a region sensor of a camera.

Fig. 11 is a view showing an example of an image obtained by the binarization processing in step 102 of Fig. 9.

Fig. 12 is a view showing a counting device according to a second embodiment of the present invention.

Fig. 13A is an image obtained by photographing a laminate including a dummy substrate with a camera.

Fig. 13B is an image when a halo is generated in the dummy substrate region.

Fig. 14 is a flow chart showing an example of processing mainly performed by the processing unit in the case of using a dummy substrate.

According to the above-described counting device, since the optical axis of the sensor of the sensor is disposed at a position deviated from the center position of the laminated body in the laminating direction of the plate body, even for a special configuration having a light transmitting layer and a reflecting layer When the board is counted, it is also possible to suppress the deviation of the light receiving state when the reflected light of the reflective layer is received by the sensor. With this, Can improve the counting accuracy of the board.

The sensor may be disposed at a position corresponding to the plate body of the plurality of plate bodies located at an end region of the laminated body, or may be stacked as described above. The end region of the body also has a position corresponding to the outer position. Thereby, the deviation of the light receiving state of the sensor can be further suppressed, so that the processing mechanism can accurately count the board.

The sensor may also be configured such that the optical axis of the sensor is non-parallel to the main surface of the laminate. Thereby, the deviation of the light receiving state of the sensor can be further suppressed, so that the counting accuracy of the processing mechanism can be further improved.

The plate body at the end of the end portion of the laminate may be a transparent dummy substrate. Thereby, the processing means can set the area of the dummy substrate to the reference area at the time of counting processing by detecting the transparent dummy substrate.

Each of the plate bodies has a first main surface perpendicular to a thickness direction of each of the plate bodies and a second main surface opposite to the first main surface, and the reflective layer may be disposed adjacent to the first main surface and One side of any one of the aforementioned second main surfaces. Alternatively, the reflective layer may be provided on the first main surface side, and the plate body may further have a light transmittance lower than a light transmittance of the light transmitting layer provided on the second main surface side. Light transmittance layer. These plates may also be optical information recording media.

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

[First Embodiment]

(Configuration of counting device)

Fig. 1 is a perspective view showing a counting device according to a first embodiment of the present invention. FIG. 2 is a side view showing the counting device 100 shown in FIG. 1.

The counting device 100 includes a light source 10, a camera 30 having a sensor that receives image light of the counting object 20, and a video letter obtained from the camera 30. The processing unit (processing means) 50 (see FIG. 2) that performs the counting process.

The object 20 to be counted is a laminate 25 in which a plurality of sheets are laminated. 3A and 3B are side views schematically showing the structure of the plate body. The plate body is basically a flat plate-like object having an optically transparent layer 21 and a reflective layer 22. Typically, the board is an optical information recording medium, which is referred to as a "disc" in the following description. The optical disk D has a main surface which is a surface (x-y plane) substantially perpendicular to the z direction of the vertical direction of the stacking direction of the optical disk D. As the optical disc, a BD (Blu-ray Disc) or a CD (Compact Disc) can be exemplified. Fig. 3A shows the configuration of the BD, and Fig. 3B shows the configuration of the CD.

As shown in FIG. 3A, the BD has a transparent substrate that is a light transmissive layer 21, and a reflective layer 22 that is provided on the first main surface side of the transparent substrate. Further, the BD as a final product has a low light transmittance layer 23 provided on the second main surface side on the opposite side to the first main surface in the thickness direction. The typical low light transmittance layer 23 is a label layer (printing layer) having a light transmittance lower than that of the light transmitting layer 21. A pit 22p as a source of recorded information is formed on the surface of the reflective layer 22, which surface is hereinafter referred to as a recessed surface 22a. Further, a transparent cover layer (not shown) is formed on the concave surface 22a of the reflective layer 22.

On the other hand, as shown in FIG. 3B, the CD has a transparent substrate as the light transmitting layer 21, and a reflective layer 22 and a low light transmittance layer (label layer) 23 provided on the same main surface side of the transparent substrate. That is, the light-transmitting layer 21 functions as a coating layer of the concave surface 22a of the reflective layer 22, and a label layer is provided on the surface 22b on the opposite side of the concave surface 22a.

Regardless of the CD or the BD, the reflective layer 22 is disposed adjacent to any of the two main surfaces of the light transmissive layer 21.

As shown in FIGS. 1 and 2, a laminated body 25 of the optical disk D is held on the optical disk holder 8. The disc holder 8 includes a support base member 7 and a support base member 7 A stacker pin 6 is placed upright. Specifically, as shown in FIG. 2, the stacking pin 6 is inserted into the hole 24 provided in the center of the optical disk D, thereby holding the optical disk D. In the present embodiment, the concave surface 22a of the reflective layer 22 of the optical disk D faces downward, and the optical disk D is laminated on the optical disk holder 8.

The light source 10 is a line light source that is linearly arranged in the z direction. As the light source 10, for example, a halogen lamp, a fluorescent lamp, or an LED (Light Emitting Diode) can be used. By using the light source 10 linear in the z direction, the amount of light incident on the laminated body 25 can be uniformly present in the z direction of the laminated body 25. The light emitted from the light source 10 may be light whose center wavelength is substantially set to a single color, or may be light of a plurality of mixed colors.

As shown in FIG. 2, the camera 30 has a region sensor 31 as a sensor, and the region sensor 31 can be, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor). The metal oxide semiconductor element also has a lens 32. The area sensor 31 is not limited to a CCD or a CMOS, and may be any element as long as it is a two-dimensional array of photoelectric conversion elements. The lens 32 can also be provided in plural.

The processing unit 50 acquires the video signal obtained by the area sensor 31, and performs predetermined video processing based on the video signal, as will be described later, to calculate the number of optical discs.

4 is an optical arrangement for explaining the lens 32 and the area sensor 31 (here, CCD) provided in the camera 30. The lens can also be provided with a plurality of lenses. The optical system of such a camera 30 generally satisfies the following relationship.

WD (working distance) of lens 32: field of view = focal length of lens 32: CCD size

As an example of these parameters, the settings are as follows: CCD size (length of one side in the z direction): 6.15 mm

Focus distance of lens 32: 16mm

Field of view (here, the length of the object, that is, the length of the laminated body 25 in the z direction) ≒120 mm

WD of lens 32: 312mm

The above parameters are not limited to the above values, and can be appropriately changed. For example, various parameters can be designed while ensuring that the WD is around 600 mm.

The processing unit 50 is configured by, for example, a PC (Personal Computer). In other words, the processing unit 50 mainly includes hardware such as a CPU (Micro Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory). Further, software for performing counting processing including image processing is stored in a ROM or other storage device. In addition to the CPU, or in place of the CPU, it can be equipped with a PLD (Programmable Logic Device) such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit). Integrated circuit) and so on. Alternatively, the processing unit 50 may be configured not only by a soft body but also by a hardware.

(configuration of the camera)

The sensor optical axis 30A of the camera 30 substantially coincides with the rotational symmetry axis of the area sensor 31 (and lens 32). The height position of the camera 30 is set such that the sensor optical axis 30A is located at a height position deviated from the center position (here, the axis C) in the z direction of the laminated body 25. The axis C is an axis parallel to the main surface of each of the optical discs D. In the present embodiment, the sensor optical axis 30A is disposed at a height position corresponding to the position of the optical disk D in the end portion of the laminated body 25 in the z direction. More specifically, the sensor optical axis 30A is disposed at a height position corresponding to the lowermost end of the optical disc D(1) (refer to FIG. 7A).

Here, as opposed to the position of any one of the optical discs in the z direction in the laminated body 25 The height position of the image is the position of the sensor optical axis 30A detected by the area sensor 31 along the shape of the horizontal straight line without substantially deforming the image light of the one optical disc D.

Fig. 5 is a view showing a pattern in which the image of the checkered line which originally intersects vertically and vertically intersects with the distortion caused by the lens 32 of the camera 30. The area sensor 31 detects an image in which the distortion caused by the lens 32 causes the central portion to be bulged (barrel-shaped). Therefore, in the case where the sensor optical axis 30A of the camera 30 shown in FIG. 2 coincides with the center position of the laminated body 25, that is, the axis C, the shape of the image of the laminated body 25 captured by the camera 30 is as shown in FIG. Shown is a barrel-shaped deformed shape. If the disc is counted based on such an image, there arises a problem that the counting accuracy is lowered as explained below.

7A and 7B are views for explaining that the light taken by the camera from the laminated body 25 of the optical disk D differs depending on the position of the camera 30 in the z direction. Here, BD is shown as the disc D.

In the present embodiment, as shown in FIG. 7A and FIG. 7B, the camera 30 acquires a part of each of the light emitted from the light source 10 on the light-transmitting layer 21 of the optical disk D and emitted from each of the light-transmitting layers 21 (L(1) , L(2), ... L(n)). For example, if attention is paid to the optical disk D(1) at the lowermost end among the stacked optical disks D(1) to D(n), the light transmitting layer 21 of the optical disk D(1) is incident on and from the light transmitting layer 21 The light emitted is roughly divided into the following two kinds of light.

One is a light that is repeatedly reflected between the reflective layer 22 of the optical disc D(1) and the reflective layer 22 of the optical disc D(2) to be emitted from the transparent layer 21 (including light totally reflected in the medium of the light-transmitting layer 21) ). The other is light that is not reflected by the reflective layer 22 and passes directly through the light transmissive layer 21 of the disc D(1). The light including these rays is emitted three-dimensionally from the end faces of the respective light-transmissive layers 21 of the respective discs D(1) to D(n), and the camera 30 acquires some of the three-dimensional radial light. In addition, Of course, a part of the light incident on the light-transmitting layer 21 is absorbed by the reflective layer 22 or the light-transmitting layer 21.

In FIG. 7A, the camera 30 is disposed at a position where the sensor optical axis 30A is deviated from the center position of the laminated body 25, and is disposed, for example, at a height position corresponding to the optical disk D(1) of the lower end portion as described above. On the other hand, in FIG. 7B, the camera 30 is disposed such that the sensor optical axis 30A substantially coincides with the center position of the laminated body 25.

Here, as shown in FIG. 7A, a part of the light (which is indicated by a broken line arrow) which is finally reflected from the inner surface 22b of the reflective layer 22 of the optical disk D and which is emitted from the light-transmitting layer 21 is not incident on the camera 30 and faces the camera 30. . Here, in all of the optical disks D(1) to D(n), since the reflected light reflected from the inner surface 22b of the reflective layer 22 is uniformly directed upward of the camera 30, the respective light incidents incident on the camera 30 are transmitted. The deviation of the total amount of light of the layer 21 is small.

On the other hand, in FIG. 7B, with the axis C as a boundary, reflected light (a thick dotted arrow) reflected from the inner surface 22b of the reflective layer 22 of the lower optical disk D is incident on the camera 30, and the optical disk D on the upper side of the axis C is incident. The reflected light (the thin dotted arrow) reflected by the inner surface 22b of the reflective layer 22 faces the upper side of the camera 30. That is, compared with the case shown in FIG. 7A, in the configuration of the camera 30 shown in FIG. 7B, the deviation of the total light amount of each of the light-transmitting layers 21 incident on the area sensor 31 is large. As described above, when the light amount deviation occurs in each of the optical disks D(1) to D(n), there is a problem in that the accuracy of detection of the optical disk D by the processing unit 50 is low, resulting in low counting accuracy.

In order to solve the above problem, it is conceivable to use the dedicated lens 32 for suppressing the distortion of the lens 32 of the camera 30 as the hardware of the camera 30, or to use the deformation correction algorithm by the software in the processing unit 50. But its design adds labor and cost, which is not practical.

Therefore, in the counting device 100 of the present embodiment, as shown in FIG. 7A, the height position of the sensor optical axis 30A of the camera 30 is from the z direction of the laminated body 25. The center position, that is, the axis C is shifted, and the deviation of the amount of light received by the area sensor 31 of the camera 30 from each of the optical discs D is suppressed.

According to the above, the configuration of the sensor optical axis 30A of the camera 30 is not limited to being located at a position corresponding to the optical disc D(n) at the lowermost end. For example, as shown in FIG. 8A, for example, when there are 20 or more laminated optical discs, the area from the lowermost end to the second or third optical disc, that is, from the lowermost end to the cascading The sensor optical axis 30A can be disposed in a region between 10% of the entire body, that is, a position corresponding to the end region 25a. Alternatively, as shown in FIG. 8B, the sensor optical axis 30A may be disposed at a height position corresponding to the lower outer region of the lowermost end portion of the laminated body 25. It is considered that depending on the size of the area sensor of the camera or the type and quality of the lens, there is a problem that the problem of barrel distortion of the image obtained by the camera described above cannot be solved. In this case, as shown in FIG. 8C, by arranging the sensor optical axis 30A so as not to be parallel to the main surface of the laminated body 25, that is, the x-y plane, the problem of barrel deformation can be solved. By the posture of the camera 30, the laminated body 25 can be imaged at an angle viewed from below, so that the image of the optical disk D (1) at the lowermost end becomes a horizontal straight line, and the image in which deformation is suppressed can be surely obtained. In this case, it is preferable to arrange the camera 30 so as to pass through the end region 25a of the laminated body 25.

(action of the counting device)

Next, the operation of the counting device 100, in particular, the processing performed by the processing unit 50 will be described. Figure 9 is a flow chart showing the process. When light is emitted from the light source 10, the light is incident on the laminated body 25 of the optical disk D, and the light passing through the laminated body 25 is acquired by the camera 30 (step 101). FIG. 10 shows an example of an image taken by the area sensor 31 of the camera 30. The counting device 100 is disposed, for example, in a dark room, whereby the area sensor 31 can acquire image light in which a region having high luminance and a region having low luminance are clearly distinguished. The processing unit 50 performs binarization processing on the brightness of the image (step Step 102). The processing unit 50 may store the critical luminance value for binarization as a threshold value in advance in the memory.

FIG. 11 shows an example of a video obtained by the binarization processing of step 102. The processing unit records [1] as a region having a high luminance and [0] as a region having a low luminance. The region having a high luminance corresponds to the light receiving region when the light emitted from the light transmitting layer 21 is received by the area sensor 31. The processing unit 50 counts the change in luminance of "(0 to 1) and (1 to 0)" as a single change in the predetermined region S in the video, and counts the number of times of the change (step 103). The processing unit 50 then outputs the counted number as the number of sheets of the optical disc (step 104). The number of pieces of information outputted is displayed on, for example, a display unit not shown.

As described above, since the sensor optical axis 30A of the camera 30 is disposed at a position deviated from the center position in the z direction, even a plate having a special structure having the light transmitting layer 21 and the reflecting layer 22 is a disc. When D is counted, the deviation of the light receiving state when the reflected light of the reflective layer 22 is received by the area sensor 31 can also be suppressed. Thereby, the problem described in FIG. 7B can be solved, and the counting accuracy of the optical disc D can be improved.

In particular, in the present embodiment, the sensor optical axis 30A is disposed at a position corresponding to the optical disc (D1) at the lowermost end portion of the laminated body 25. Therefore, the variation in the light receiving state of the area sensor 31 can be further suppressed, so that the processing unit 50 can accurately count the optical disc.

Further, the counting device 100 of the present embodiment can count the discs D from about 0 to about 120, in particular, by using the camera 30 having the above-described field of view of about 120 mm.

A plurality of regions S to be detected in the binarized image shown in FIG. 11 can be set. For example, a region S is set on both sides with the region corresponding to the stack pin 6 as a center. In this case, the processing unit 50 counts the change in the brightness of the two regions S, and if the two do not match each other, the information indicating the error can be output. Other processing can be performed.

[Second Embodiment]

Fig. 12 is a view showing a counting device according to a second embodiment of the present invention. In the following description, the description of the same parts and functions as those of the counting device 100 according to the above-described first embodiment will be omitted or omitted, and the differences will be mainly described.

In the counter device 200 of the present embodiment, the dummy substrate D' is disposed at the lowermost end portion of the laminated body 25 of the optical disk. The dummy substrate D' has a different configuration from the optical disk D, specifically, does not have the reflective layer 22 and becomes a transparent substrate. The shape and size of the dummy substrate D' are substantially the same as those of the disc D.

The sensor optical axis 30A of the camera 30 is disposed at a position corresponding to the height position of the dummy substrate D'. Further, the posture of the camera 30 is the same as the posture shown in FIG. 8C, and is set to a posture in which the image can be imaged at an angle of the bottom laminated body 25.

Fig. 13A is an image obtained by photographing the laminated body 25 including the dummy substrate D' by the camera 30. Since the dummy substrate D' does not have the above-described reflective layer 22, label layer or the like as a transparent substrate, the area of the dummy substrate D' has higher luminance than the area of other optical discs. Therefore, the processing unit 55 can clearly distinguish the area of the dummy substrate D' and the area of the optical disk which is the object of counting, and set the area of the dummy substrate D' to be the reference area in the image processing.

Specifically, the reference in the image processing refers to a reference for detecting an area where the counting is started (counting from the area of the optical disk on the upper side of the dummy substrate D') or a criterion for determining whether or not the laminated body 25 is accommodated within a predetermined angle. Wait.

The case where the laminated body 25 is inclined beyond a predetermined angle means that the inclination angle of the main surface of the optical disk with respect to the x-y horizontal plane exceeds a predetermined angle. If such an inclination occurs, the accuracy of the counting process of the processing unit 55 will be lowered.

In the present embodiment, as described above, the posture of the camera 30 is set to look up in a stack. A posture in which the image can be taken at the angle of the body 25. Therefore, the camera 30 can obtain a video image of the optical disk in the lower end region of the laminated body 25, in particular, an image in which the deformation of the dummy substrate D' has been suppressed.

Fig. 14 is a flow chart showing an example of processing mainly performed by the processing unit 55 in the case where such a dummy substrate D' is used. The processing shown in Fig. 14 will be described centering on a point different from the processing of Fig. 9 .

The processing unit 55 stores the ideal image of the laminated body 25 including at least the transparent dummy substrate D' as a sample image in advance in the memory. The processing unit can store a plurality of different sample images in advance depending on, for example, the type of the optical disc, such as a CD or a BD, or the presence or absence of a label layer.

The processing unit 55 compares the image acquired in step 201 (hereinafter, referred to as a captured image for convenience) with the sample image stored in the memory (step 202). Specifically, the processing unit 55 detects an area in which the dummy substrate D' in the image is acquired by the comparison processing (especially the comparison processing of the brightness and the position of the dummy substrate D' in the entire image). Further, the processing unit 55 may set the region having the highest luminance value as the region of the dummy substrate D' without undergoing such comparison processing.

The processing unit 55 determines whether or not the value of the inspection item such as the inclination or the luminance value of the dummy substrate D' satisfies a predetermined condition (step 203).

The predetermined condition is such that the inclination of the dummy substrate D' as described above, that is, whether the inclination of the laminated body 25 is smaller than a predetermined angle, or whether the luminance value of the region of the dummy substrate D' is within a predetermined luminance range or the like. The purpose of checking the inclination of the former body 25 is as described above. On the other hand, the latter brightness value is checked for the following purpose. That is, as shown in FIG. 13B, if the brightness of the area of the dummy substrate D' is too high and the halo is generated in the area, the brightness of light from other optical discs becomes high, which may cause these discs. The respective light produces an overlap. In this case, there is a flaw in the occurrence of an error count. Therefore dummy substrate D’ The brightness of the area is necessary to be included in the specified range.

When the value of the inspection item satisfies the predetermined condition (YES in step 203), the processing unit 55 performs binarization processing for acquiring the image (step 204). When the value of the inspection item does not satisfy the predetermined condition (NO in step 203), the processing unit 55 outputs information indicating that the error has occurred (step 205). The processing unit 55 can also perform another processing instead of the error output processing.

Then, the processing unit 55 detects the region of the dummy substrate D' by the comparison processing in the above step 202. Therefore, the number of times of the luminance change is calculated based on the upper side of the region of the dummy substrate D' (step 206).

As described above, in the present embodiment, the area of the dummy substrate D' can be set as the area to be used as a reference in image processing. By setting such a region to be the reference, it is possible to increase the change in the processing content of the image processing.

Further, since the posture of the camera 30 is a posture in which the image pickup can be performed at an angle of the laminated body 25, it is possible to reduce the amount of light received by the camera 30 from the dummy substrate D', and it is possible to reliably suppress the aforementioned halation. happened.

[Other embodiments]

The present invention is not limited to the embodiments described above, and various other embodiments can be implemented.

In the above-described embodiment, the optical disk D held by the optical disk holder 8 may be stacked such that the concave surface 22a of the reflective layer 22 faces downward, or may be stacked such that the concave surface 22a of the reflective layer 22 faces upward.

In the above embodiment, the sensor optical axis 30A of the camera 30 is disposed at a position corresponding to the optical disc D (1) at the lowermost end. However, when the orientation of the optical disk D held by the optical disk holder 8 in the up-and-down direction is the same as that shown in FIG. 7A, the optical axis 30A of the sensor can be disposed on the optical disk of the uppermost end of the laminated body 25. Corresponding position, or may be disposed at the upper portion of the uppermost portion of the laminated body 25. The corresponding position on the outside.

The dummy substrate D' may be disposed, for example, at the uppermost end portion of the laminated body 25. In this case, it is preferable to arrange the optical axis of the sensor at a position corresponding to the uppermost end portion of the dummy substrate D'.

Among the characteristic portions of the respective embodiments described above, at least two feature portions can be combined.

6‧‧‧Stacking pin

7‧‧‧Support base member

8‧‧‧Disc holder

10‧‧‧Light source

20‧‧‧ Counting objects

24‧‧‧ hole

25‧‧‧Laminated body

30‧‧‧ camera

30A‧‧‧Sensor optical axis

31‧‧‧ Area Sensor

32‧‧‧ lens

50‧‧‧Processing Department

100‧‧‧counting device

Center position in the direction of C‧‧‧z

D‧‧ disc

Claims (8)

A counting device comprising: a light source capable of illuminating a laminated body formed by laminating a plurality of plates having a light transmitting layer and a reflecting layer; and a sensor for arranging the optical axis of the sensor from the laminated body The center of the stacking direction is displaced from the position, and receives light transmitted through the stacked body; and the processing means counts the board included in the stacked body based on a signal acquired by the sensor. The counting device according to claim 1, wherein the optical axis of the sensor is disposed at a height position of a plate body located at an end portion of the plurality of plate bodies in the stacking direction, or is closer to an end of the laminated body The portion region is also located at a height position of the lower outer side or the upper outer side, and the end region refers to a region from the lowermost end portion or the uppermost end portion of the laminate to a length of 10% of the entire laminate. The counting device according to claim 1 or 2, wherein the plate body has a main surface perpendicular to the stacking direction; and the sensor is configured by the optical axis of the sensor and the main surface of the plate body of the laminated body Non-parallel configuration. The counting device according to claim 2, wherein the plate body at the end of the end portion of the laminate is a transparent dummy plate. The counting device according to claim 1 or 2, wherein the plate body has a first main surface perpendicular to the stacking direction, and a second main surface that is perpendicular to the stacking direction and located on a side opposite to the first main surface; The reflective layer is disposed on a side that is biased toward either one of the first main surface and the second main surface. The counting device according to claim 5, wherein the reflective layer is provided in the foregoing The first main surface side; the plate body further has a low light transmittance layer lower than a light transmittance of the light transmission layer, and the low light transmittance layer is provided on the second main surface side. The counting device according to claim 1 or 2, wherein the plate body is an optical information recording medium. A counting method of irradiating light onto a laminated body formed by laminating a plurality of plates having a light transmitting layer and a reflecting layer; and disposing the optical axis of the sensor at a center position from a lamination direction of the stacked body The sensor at the position receives the light transmitted through the laminated body, and counts the plate body included in the laminated body based on a signal obtained by the sensor.