JP3656896B2 - Information reading device for optical recording medium, optical recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information reading apparatus and an optical recording medium for an optical recording medium, and more particularly to an optical recording medium that is most suitable for a prepaid card, a credit card, a proof card, and the like and a reader device thereof.
[0002]
[Prior art]
In modern society, various cards are used for payment and identification.
In prepaid cards, credit cards, proof cards, etc., magnetic recording media have been widely used as means for recording information such as ID numbers and monetary amounts. However, magnetic recording itself can be easily forged or altered. There was a problem.
[0003]
The present applicant has previously developed an optical recording medium in which a plurality of hologram patterns are arranged on one substrate as CGH (Computer Generated Hologram), and has applied for a patent, which is disclosed in Japanese Patent Laid-Open No. 10-143603. Has been made.
[0004]
The optical recording medium according to the disclosed technique has a configuration in which a plurality of hologram patterns are two-dimensionally arranged along a plurality of rows in the X direction and a plurality of columns in the Y direction on the surface of the card.
In order to read out recording data from such an optical recording medium, the optical recording medium is conveyed in the Y direction, irradiated with light rays to each of a plurality of hologram patterns arranged in the X direction, and projected by the transmitted or reflected diffracted light. The recorded data is read out from the pattern of the light beam to be reproduced or the reproduced image to be projected.
[0005]
As an example of the configuration of the hologram pattern in the optical recording medium, a diffraction image composed of a plurality of dots is generated with respect to incidence of single wavelength light, and the diffraction pattern is formed at a predetermined position on the image sensor surface where the diffraction image is formed. There is one that indicates a 1-bit information amount depending on whether or not a dot is imaged.
According to said structure, it is possible to represent information, such as a character and a number, with the combination of the dot contained in the diffraction image which one or several hologram pattern produces | generates.
[0006]
In the optical recording medium having the above hologram pattern and the reproducing apparatus thereof, the present applicant has previously filed a patent application regarding a configuration in which each hologram pattern captures and captures a diffraction image generated on the image sensor surface at an optimal timing. This is disclosed as Japanese Unexamined Patent Publication No. 2000-47557.
[0007]
In the disclosed technique, in addition to the computer-generated hologram pattern (hereinafter referred to as information CGH) in which data is recorded, a two-dimensional hologram pattern (hereinafter referred to as control CGH) is provided to give imaging timing, and the diffracted light from the control CGH is captured. There has been proposed a configuration in which a light receiving element other than the element receives light to generate a tracking signal and provide an optimum capturing timing of the image sensor.
A two-dimensional CGH card and its reader device according to the prior art based on the above disclosed technology will be described below with reference to FIGS.
[0008]
FIG. 1 is a plan view of a two-dimensional CGH card according to the prior art (FIG. 1A) and an enlarged view of a main part thereof (FIG. 1B).
In FIG. 1A, four rows of information CGH (1a) and one row of control CGH (1b) are arranged in the same direction (horizontal direction in the drawing).
[0009]
As shown in FIG. 1B, each piece of information CGH (1a) is a hologram pattern of 100 μm square and arranged at a pitch of 250 μm, and the control CGH (1b) forms dots at two different positions. Two types of CGH (control CGH1, control CGH2) are arranged alternately.
Similarly, as shown in FIG. 1B, the individual horizontal boundary lines of the control CGH (1b) are arranged to coincide with the horizontal center line of the information CGH (1a).
[0010]
Next, the reading operation of the CGH card by the reader device will be described with reference to FIG.
The light of the laser (2a), which is a light source, is branched into five, and four pieces of information CGH (1a) and control CGH (1b) arranged perpendicular to the card transport direction as shown in FIG. The rows are irradiated simultaneously.
[0011]
The reflection diffraction image of the information CGH (1a) generated in response to the irradiation forms an image on a CCD (Charge Coupled Device) (2b) as an image sensor, and the reflection diffraction images of the two types of control CGH are CCD (2b). Are divided and formed on the respective light receiving surfaces of two-division PD (photodiodes) A and B (2c).
[0012]
A plan view of the CCD (2b) element surface is shown in FIG.
The four pieces of information CGH (1a) irradiated simultaneously with the laser light generate respective diffraction images in four different areas (2d1) (2d2) (2d3) (2d4) on the element surface.
As described above, the diffraction image formed in each area includes a plurality of bright dot dots, and the arrangement of the dots represents specific information.
[0013]
When imaging of the diffraction image in each area of the imaging surface is completed by control means and signal processing (not shown), the CGH card is conveyed in a predetermined direction by a predetermined amount (for information CGH 1 column), and for the next column of information CGH (1a) Laser irradiation is possible, and a new diffraction image is captured by the next row of information CGH as shown in FIG.
[0014]
Next, with reference to the timing chart of FIG. 3, the capture timing control by the diffraction image of the control CGH (1b) received by the PD (2c) will be described.
[0015]
PD A and PD B in FIG. 3 indicate outputs proportional to the amount of light hitting each PD (2c).
AB is a difference signal between two PDs (PD A and PD B).
The trigger signal is a signal obtained by binarizing AB with a predetermined threshold value.
When the levels of PD A and PD B are the same, that is, when the value of AB crosses zero, the timing of the rising and falling edges of the trigger signal is controlled by the spot irradiated from the laser CGH1 , 2 is in the middle (middle).
Further, at this time, the CGH card and the reader device are configured so that a laser spot is present at the center of the information CGH (1a).
[0016]
The capture control signal in FIG. 3 is a signal obtained by detecting the edge of the trigger signal. The capture control signal is used to reset signal capture in the CCD and start capturing, thereby capturing an image of one piece of information CGH (1a). Thus, the information can be obtained without mixing the adjacent information CGH images whose transport positions are before and after, that is, without the occurrence of crosstalk.
[0017]
[Problems to be solved by the invention]
By the way, when the timing is determined by generating the capture control signal in the above configuration, there is a possibility that a timing shift may occur due to variations in characteristics of each PD (2c).
As shown in FIG. 4, when a deviation occurs from a normal diffraction image (FIG. 4A), a light beam is irradiated to information CGH adjacent in the transport direction, and normal as shown in FIG. 4B. In addition to the unfavorable diffraction image (4a), an unnecessary diffraction image (4b) by the adjacent information CGH is simultaneously captured, which may make it difficult to normally recognize information.
[0018]
In particular, the CCD (2a) has a disadvantage that the capturing speed of even frames or odd frames is limited to 60 Hz except for special elements.
On the other hand, assuming the use of a CMOS sensor that has a small number of pixels but can capture one frame at a rate of 1 KHz or more, when capturing and recognizing in high-speed scanning, there is a variation in PD characteristics with respect to the capturing speed. The timing shift due to the above becomes a relatively large value, which is a great obstacle to the correct reading operation of the CGH card. Further, the above problem has been an obstacle to simplify the recognition algorithm.
[0019]
The present invention has been made in view of the above-described situation, and an information reading apparatus and an optical recording medium for an optical recording medium in which adverse effects (crosstalk) due to a shift in diffraction image capturing timing do not occur even when high-speed information is captured by a CGH card. To provide the medium,
“(Claim 1)
When reading information from an information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to monochromatic light irradiation are arranged in series, and a large number of hologram patterns in the information recording area A timing information recording area in which a number of timing information to be used is recorded as a series of hologram patterns. Each hologram pattern in the information recording area can generate a diffraction image on each divided area obtained by dividing the imaging surface into a plurality of areas. As such, an optical recording medium having a configuration in which different types of hologram patterns are arranged adjacent to each other,
An information reading device that reads information from a hologram pattern in the information recording area while being conveyed in the arrangement direction of the hologram pattern in the information recording area,
Irradiation means for sequentially irradiating each hologram pattern in the information recording area and each hologram pattern in the timing information recording area at a position corresponding to each hologram pattern in the information recording area,
An imaging signal output means for generating and outputting an imaging signal including a diffraction image generated based on reception of diffracted light of monochromatic light applied to each hologram pattern in the information recording area;
Timing information output means for outputting timing information based on reception of diffracted light of monochromatic light irradiated to each hologram pattern in the timing information recording area;
Storage means for storing the position information of each divided area on the imaging surface in association with different types of hologram patterns in the information recording area;
Discrimination information output means for outputting discrimination information for discriminating different types of hologram patterns in the information recording area irradiated with monochromatic light;
Using the timing information, by cutting out a signal related to the diffraction image generated on the divided area specified based on the position information and the discrimination information from the imaging signal, each information recording area An information reading apparatus for an optical recording medium, comprising: a diffraction image signal output unit that outputs a diffraction image signal related to a diffraction image of a hologram pattern. Or
“(Claim 2)
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to irradiation of monochromatic light are arranged in series and a plurality of the series of hologram pattern rows are arranged in parallel, and the information recording area Timing information recording area in which a large number of timing information used when reading information from a large number of hologram patterns is recorded as a series of hologram patterns, and each hologram pattern constituting each hologram pattern row in the information recording area is An optical recording medium having a configuration in which different types of hologram patterns are arranged adjacent to each other so that a diffraction image can be generated on each divided area obtained by dividing the imaging surface into a plurality of areas,
An information reading device that reads out information from each hologram pattern row in the information recording area by irradiating monochromatic light so as to straddle all the hologram pattern rows while being conveyed in the arrangement direction of the hologram pattern rows in the information recording area There,
Each hologram pattern constituting each hologram pattern row in the information recording area and each hologram pattern in the timing information recording area at a position corresponding to each hologram pattern constituting each hologram pattern row in the information recording area And irradiation means for sequentially irradiating monochromatic light,
Imaging signal output for generating and outputting an imaging signal including a diffraction image generated based on reception of diffracted light of monochromatic light irradiated to each hologram pattern constituting each hologram pattern row in the information recording area from the imaging surface Means,
Timing information output means for outputting timing information based on reception of diffracted light of monochromatic light irradiated to each hologram pattern in the timing information recording area;
Storage means for storing position information of each of the divided areas on the imaging surface in association with different types of hologram patterns constituting the hologram pattern rows of the information recording area;
Discriminating information output means for outputting discriminating information for discriminating different types of hologram patterns constituting the hologram pattern rows of the information recording area irradiated with monochromatic light;
Using the timing information, the signal related to the diffraction image generated on the divided area specified based on the position information and the discrimination information is cut out from the imaging signal, thereby the information recording area An information reading apparatus for an optical recording medium, comprising: a diffraction image signal output unit that outputs a diffraction image signal related to a diffraction image of each hologram pattern constituting each hologram pattern row. Or
“(Claim 3)
An information reading device for an optical recording medium according to claim 1 or 2,
The storage means
An information reading apparatus for an optical recording medium, wherein the position information can be rewritten and changed in accordance with an arrangement structure of each hologram pattern in the information recording area in the optical recording medium. Or
“(Claim 4)
An optical recording medium used in the information reading apparatus for an optical recording medium according to claim 1,
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in accordance with irradiation of monochromatic light are arranged in series,
A timing information recording area in which timing information used when reading information from a number of hologram patterns in the information recording area is recorded as a series of hologram patterns;
Each hologram pattern of the information recording area is characterized in that different types of hologram patterns are arranged adjacent to each other so that a diffraction image can be generated on each divided area obtained by dividing the imaging surface into a plurality of parts. Optical recording media. Or
“(Claim 5)
An optical recording medium used in the information reading apparatus for an optical recording medium according to claim 2,
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to irradiation of monochromatic light are arranged in series and a plurality of the series of hologram pattern rows are arranged in parallel,
A timing information recording area in which timing information used when reading information from a number of hologram patterns in the information recording area is recorded as a series of hologram patterns;
Each hologram pattern constituting each hologram pattern row in the information recording area has different types of hologram patterns adjacent to each other so that a diffracted image can be generated on each divided area obtained by dividing the imaging surface. An optical recording medium which is arranged. Is an object of the invention.
[0020]
[Means for Solving the Problems]
In order to solve the above problems, the invention of claim 1 of the present application
“When reading information from an information recording area in which a large number of hologram patterns are arranged in series on a predetermined imaging surface in response to the irradiation of monochromatic light and a large number of hologram patterns in the information recording area Timing information recording area in which a large number of timing information used for recording is recorded as a series of hologram patterns, and each hologram pattern in the information recording area generates a diffraction image on each divided area obtained by dividing the imaging surface into a plurality of parts. As possible, an optical recording medium having a configuration in which different types of hologram patterns are arranged adjacent to each other,
An information reading device that reads information from a hologram pattern in the information recording area while being conveyed in the arrangement direction of the hologram pattern in the information recording area,
Irradiation means for sequentially irradiating each hologram pattern in the information recording area and each hologram pattern in the timing information recording area at a position corresponding to each hologram pattern in the information recording area,
An imaging signal output means for generating and outputting an imaging signal including a diffraction image generated based on reception of diffracted light of monochromatic light applied to each hologram pattern in the information recording area;
Timing information output means for outputting timing information based on reception of diffracted light of monochromatic light irradiated to each hologram pattern in the timing information recording area;
Storage means for storing the position information of each divided area on the imaging surface in association with different types of hologram patterns in the information recording area;
Discrimination information output means for outputting discrimination information for discriminating different types of hologram patterns in the information recording area irradiated with monochromatic light;
Using the timing information, by cutting out a signal related to the diffraction image generated on the divided area specified based on the position information and the discrimination information from the imaging signal, each information recording area An information reading apparatus for an optical recording medium, comprising: a diffraction image signal output unit that outputs a diffraction image signal related to a diffraction image of a hologram pattern. "I will provide a.
[0021]
In order to solve the above problems, the invention of claim 2 of the present application is
"Information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to irradiation of monochromatic light are arranged in series and a plurality of the series of hologram pattern rows are arranged in parallel, and the information recording Timing information recording area in which a large number of timing information used for reading information from a large number of hologram patterns in the area is recorded as a series of hologram patterns, and each hologram pattern constituting each hologram pattern row in the information recording area Is an optical recording medium having a configuration in which different types of hologram patterns are arranged adjacent to each other so that a diffraction image can be generated on each divided area obtained by dividing the imaging surface into a plurality of areas.
An information reading device that reads out information from each hologram pattern row in the information recording area by irradiating monochromatic light so as to straddle all the hologram pattern rows while being conveyed in the arrangement direction of the hologram pattern rows in the information recording area There,
Each hologram pattern constituting each hologram pattern row in the information recording area and each hologram pattern in the timing information recording area at a position corresponding to each hologram pattern constituting each hologram pattern row in the information recording area And irradiation means for sequentially irradiating monochromatic light,
Imaging signal output for generating and outputting an imaging signal including a diffraction image generated based on reception of diffracted light of monochromatic light irradiated to each hologram pattern constituting each hologram pattern row in the information recording area from the imaging surface Means,
Timing information output means for outputting timing information based on reception of diffracted light of monochromatic light irradiated to each hologram pattern in the timing information recording area;
Storage means for storing position information of each of the divided areas on the imaging surface in association with different types of hologram patterns constituting the hologram pattern rows of the information recording area;
Discriminating information output means for outputting discriminating information for discriminating different types of hologram patterns constituting the hologram pattern rows of the information recording area irradiated with monochromatic light;
Using the timing information, the signal related to the diffraction image generated on the divided area specified based on the position information and the discrimination information is cut out from the imaging signal, thereby the information recording area An information reading apparatus for an optical recording medium, comprising: a diffraction image signal output unit that outputs a diffraction image signal related to a diffraction image of each hologram pattern constituting each hologram pattern row. "I will provide a.
[0022]
In order to solve the above problems, the invention of claim 3 of the present application is
“An information reading device for an optical recording medium according to claim 1 or 2,
The storage means
An information reading apparatus for an optical recording medium, wherein the position information can be rewritten and changed in accordance with an arrangement structure of each hologram pattern in the information recording area in the optical recording medium. "I will provide a.
[0023]
In order to solve the above problems, the invention of claim 4 of the present application is
“An optical recording medium used in the information reading apparatus for an optical recording medium according to claim 1,
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in accordance with irradiation of monochromatic light are arranged in series,
A timing information recording area in which timing information used when reading information from a number of hologram patterns in the information recording area is recorded as a series of hologram patterns;
Each hologram pattern of the information recording area is characterized in that different types of hologram patterns are arranged adjacent to each other so that a diffraction image can be generated on each divided area obtained by dividing the imaging surface into a plurality of parts. Optical recording media. "I will provide a.
[0024]
In order to solve the above problems, the invention of claim 5 of the present application is
“An optical recording medium used in the information reading apparatus for an optical recording medium according to claim 2,
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to irradiation of monochromatic light are arranged in series and a plurality of the series of hologram pattern rows are arranged in parallel,
A timing information recording area in which timing information used when reading information from a number of hologram patterns in the information recording area is recorded as a series of hologram patterns;
Each hologram pattern constituting each hologram pattern row in the information recording area has different types of hologram patterns adjacent to each other so that a diffracted image can be generated on each divided area obtained by dividing the imaging surface. An optical recording medium which is arranged. "I will provide a.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an optical recording medium information reading apparatus and an optical recording medium according to an embodiment of the present invention will be described with reference to FIGS.
In order to avoid duplication, the same elements as those of the related art described above are partially omitted, and the same elements are denoted by the same reference numerals.
[0026]
In this embodiment,
“(Claim 1)
When reading information from an information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to monochromatic light irradiation are arranged in series, and a large number of hologram patterns in the information recording area A timing information recording area in which a number of timing information to be used is recorded as a series of hologram patterns. Each hologram pattern in the information recording area can generate a diffraction image on each divided area obtained by dividing the imaging surface into a plurality of areas. As such, an optical recording medium having a configuration in which different types of hologram patterns are arranged adjacent to each other,
An information reading device that reads information from a hologram pattern in the information recording area while being conveyed in the arrangement direction of the hologram pattern in the information recording area,
Irradiation means for sequentially irradiating each hologram pattern in the information recording area and each hologram pattern in the timing information recording area at a position corresponding to each hologram pattern in the information recording area,
An imaging signal output means for generating and outputting an imaging signal including a diffraction image generated based on reception of diffracted light of monochromatic light applied to each hologram pattern in the information recording area;
Timing information output means for outputting timing information based on reception of diffracted light of monochromatic light irradiated to each hologram pattern in the timing information recording area;
Storage means for storing the position information of each divided area on the imaging surface in association with different types of hologram patterns in the information recording area;
Discrimination information output means for outputting discrimination information for discriminating different types of hologram patterns in the information recording area irradiated with monochromatic light;
Using the timing information, by cutting out a signal related to the diffraction image generated on the divided area specified based on the position information and the discrimination information from the imaging signal, each information recording area An information reading apparatus for an optical recording medium, comprising: a diffraction image signal output unit that outputs a diffraction image signal related to a diffraction image of a hologram pattern. Or
“(Claim 2)
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to irradiation of monochromatic light are arranged in series and a plurality of the series of hologram pattern rows are arranged in parallel, and the information recording area Timing information recording area in which a large number of timing information used when reading information from a large number of hologram patterns is recorded as a series of hologram patterns, and each hologram pattern constituting each hologram pattern row in the information recording area is An optical recording medium having a configuration in which different types of hologram patterns are arranged adjacent to each other so that a diffraction image can be generated on each divided area obtained by dividing the imaging surface into a plurality of areas,
An information reading device that reads out information from each hologram pattern row in the information recording area by irradiating monochromatic light so as to straddle all the hologram pattern rows while being conveyed in the arrangement direction of the hologram pattern rows in the information recording area There,
Each hologram pattern constituting each hologram pattern row in the information recording area and each hologram pattern in the timing information recording area at a position corresponding to each hologram pattern constituting each hologram pattern row in the information recording area And irradiation means for sequentially irradiating monochromatic light,
Imaging signal output for generating and outputting an imaging signal including a diffraction image generated based on reception of diffracted light of monochromatic light irradiated to each hologram pattern constituting each hologram pattern row in the information recording area from the imaging surface Means,
Timing information output means for outputting timing information based on reception of diffracted light of monochromatic light irradiated to each hologram pattern in the timing information recording area;
Storage means for storing position information of each of the divided areas on the imaging surface in association with different types of hologram patterns constituting the hologram pattern rows of the information recording area;
Discriminating information output means for outputting discriminating information for discriminating different types of hologram patterns constituting the hologram pattern rows of the information recording area irradiated with monochromatic light;
Using the timing information, the signal related to the diffraction image generated on the divided area specified based on the position information and the discrimination information is cut out from the imaging signal, thereby the information recording area An information reading apparatus for an optical recording medium, comprising: a diffraction image signal output unit that outputs a diffraction image signal related to a diffraction image of each hologram pattern constituting each hologram pattern row. Or
“(Claim 3)
An information reading device for an optical recording medium according to claim 1 or 2,
The storage means
An information reading apparatus for an optical recording medium, wherein the position information can be rewritten and changed in accordance with an arrangement structure of each hologram pattern in the information recording area in the optical recording medium. Or
“(Claim 4)
An optical recording medium used in the information reading apparatus for an optical recording medium according to claim 1,
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in accordance with irradiation of monochromatic light are arranged in series,
A timing information recording area in which timing information used when reading information from a number of hologram patterns in the information recording area is recorded as a series of hologram patterns;
Each hologram pattern of the information recording area is characterized in that different types of hologram patterns are arranged adjacent to each other so that a diffraction image can be generated on each divided area obtained by dividing the imaging surface into a plurality of parts. Optical recording media. Or
“(Claim 5)
An optical recording medium used in the information reading apparatus for an optical recording medium according to claim 2,
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to irradiation of monochromatic light are arranged in series and a plurality of the series of hologram pattern rows are arranged in parallel,
A timing information recording area in which timing information used when reading information from a number of hologram patterns in the information recording area is recorded as a series of hologram patterns;
Each hologram pattern constituting each hologram pattern row in the information recording area has different types of hologram patterns adjacent to each other so that a diffracted image can be generated on each divided area obtained by dividing the imaging surface. An optical recording medium which is arranged. It is characterized in that
[0027]
FIG. 5 is a plan view of the optical recording medium (hereinafter referred to as an optical card or CGH card) of this embodiment.
The optical card is composed of four rows of information CGH (5a1) (5a2) (5a3) (5a4), which are composed of rows of hologram patterns arranged at equal intervals on a straight line in the X direction (the horizontal direction in the figure), and the capture timing thereof. It has one control CGH column (5b) to know.
Note that the information CGH column may be configured by only one column in addition to the configuration illustrated in FIG.
[0028]
The control CGH (5b) is composed of two types of CGHs in which reflection diffraction images are formed in different regions of the PD, and is arranged so that the two types of control CGHs are switched at the center position of each information CGH in the X direction shown in the figure. This is the same as the conventional configuration.
The diffracted image of the control CGH (5b) forms a bright spot image on each substantially dot in each of the divided areas on the two-divided PD arranged at a position determined by design.
The number of control CGHs included in the control CGH is arranged at least one more than the number of information CGHs included in the information CGH sequence.
This is because, as described above, the control CGH and the information CGH are arranged in a staggered manner in the transport direction and the control CGH needs to protrude in the horizontal direction for preamble (tracking start detection).
[0029]
The information CGH (5a1), (5a2), (5a3), and (5a4) arranged in four columns are arranged in the Y direction (vertical direction in FIG. 5), and a total of four hologram patterns across the four columns will be described later. At the same time, the laser beam is irradiated to read out the diffraction image, and the four diffraction images form a diffraction image in four different areas on the image sensor surface.
[0030]
Furthermore, with respect to the above four hologram patterns, each of the four hologram patterns adjacent in the X direction (horizontal direction right and left) is an area where each of the four hologram patterns is in a different position on the imaging surface. Each area is configured to be different from the area of the four adjacent hologram patterns.
Therefore, it can be said that a plurality of groups of four hologram patterns, which are divided into two different types due to different diffraction image areas, are alternately arranged in the X direction. At this time, there are at least eight different areas that do not overlap each other on the imaging surface of the imaging device on the reading device side.
[0031]
In addition, in the optical card technology using CGH, the present applicant has filed a patent application for a configuration in which a machine reads a hologram pattern and destroys it in order to display the remaining amount with a prepaid card or the like. However, since there is no essential connection with the present invention, it will not be mentioned in this application.
[0032]
FIG. 6 is a schematic external view of the CGH card reader device in the present embodiment.
In FIG. 6, the data CGH data is read by manually sliding the optical card (6c) in the groove (6b) provided in the housing (6a).
[0033]
In addition, the housing (6a) is provided with a display unit (6d) formed of a liquid crystal panel, and can display information such as a reading result. Furthermore, a USB standard interface means (6e) is provided as an interface with the personal computer. The interface is a USB (Universal Serial Bus) standard, but is not limited to this.
[0034]
FIG. 7 is a cross-sectional view of the main part of the reader device for reading the CGH card. FIG. 7A is a plan view of the reader device as viewed from above, and FIG. 7B is a side view of the reader device as viewed from a direction perpendicular thereto.
[0035]
As shown in FIG. 7, the light beam branched into five by the beam splitter (7a2) using the laser (7a) as a light source is orthogonal to the CGH arrangement (Y direction shown in FIG. 5). The four pieces of information CGH straddling the CGH row and the control CGH are arranged to be irradiated simultaneously.
[0036]
All diffraction images of information CGH (5a) are imaged on a CMOS sensor (7b), which is an imaging device capable of high-speed capture, and a diffraction image of control CGH (5b) is imaged on PD (7c).
The diffraction image capturing timing control in the CMOS sensor (7b) is performed by capturing a signal in synchronization with the timing signal using the zero cross point of the difference signal of the control CGH, that is, imaging, as in the conventional example using the CCD described above. It is also possible to adopt a configuration to perform.
However, in the present embodiment, the capture (imaging) of the signal of the CMOS sensor (7b) is performed continuously at a high speed regardless of the timing signal, and a partial image within the imaging surface is obtained using the timing signal from the captured imaging signal. The area signal is extracted.
[0037]
FIG. 8 shows a block diagram of the reading apparatus of this embodiment.
In FIG. 8, the laser (7a), which is a light source, is controlled by the LD Driver (8a) so as to emit light only during the on period (period in which the card is inserted) of the card insertion sensor (8b).
Similarly, the controller (8d) controls the CMOS sensor (7b) so that only the ON period of the sensor (8b) is captured by the capture signal from the timing generation unit (8c).
[0038]
The CMOS sensor (7b) quantizes the captured image data and outputs it as 8-bit data.
The recognition unit (8e) quantizes each data of the control CGH (5b) into “1” and “0” using threshold values, and the display unit (8f) displays the contents of the data recognized by the recognition unit (8e). .
Further, the recognition result data or the image signal taken in by the CMOS sensor (7b) can be sent to a personal computer or the like arranged outside the apparatus via the PC interface (8g), and stored or displayed.
[0039]
The operation of extracting (cutting out) a signal of a specific area on the imaging surface from the imaging signal continuously output by the CMOS sensor (7b) at a high speed will be described below.
[0040]
FIG. 9 shows an area where a diffraction image of each information CGH is formed on the imaging surface (90) of the CMOS (7b) sensor.
The CMOS (7b) sensor has a general-purpose, uniform imaging surface, and a plurality of areas of the imaging surface shown in FIG. 9 are illustrated by dividing an area where a signal is extracted from the imaging signal by the following operation. It is a thing.
As shown in FIG. 9, the imaging surface (90) has nine areas in total, and the nine areas are eight information CGH diffraction image areas (9a) (9b) (9c) (9d) (9e). (9f) (9g) (9h) and noise area (9i).
Here, the noise area (9i) is an area for detecting disturbance light and background noise that affects the entire element due to the imaging element characteristics.
Unlike the present embodiment, it is also possible to adopt a configuration in which the noise area (9i) is not provided.
[0041]
FIG. 10 (1) shows an image formation pattern when a diffraction image by information CGH is taken at an optimal timing (no crosstalk due to a shift at the time of capture), and FIG. 10 (2) shows a CGH card surface at that time. The positional relationship between the upper light beam and CGH is shown.
[0042]
The reflection diffraction images generated by the information CGH by irradiating the optical card with laser light are referred to as information CGH1-1 (9a), 2-1 (9c), 3-1 (9e), and 4-1 (9g). 4 areas and 4 areas of control CGH1-2 (9b), 2-2 (9d), 3-2 (9f), and 4-2 (9h) alternately according to the card transport Then, a diffraction image having a substantially dot luminance pattern is formed.
10 and 11, the illustration of the substantially dot luminance pattern is omitted, and black circles and the like are used for the purpose of indicating the area where the diffraction image is currently formed.
[0043]
FIG. 11 (1) shows an imaging pattern when the capture timing is shifted, and FIG. 11 (2) shows the positional relationship between the light beam on the CGH card surface and the CGH at that time.
For example, if a laser beam irradiation spot partially covers the adjacent CGH, the image should be imaged only in the CGH1-1 area (9a), but the CGH1-2 (9b) also has a weak light quantity but a diffraction image. Form an image.
[0044]
An operation in which the reading apparatus according to the present embodiment reads a diffraction image without reading deviation (no crosstalk) using the CGH card will be described below.
FIG. 12 is a block diagram of the recognition unit (8e) in the reading apparatus.
For the recognition (reading of the diffraction image), the addition data of each area is used as described below.
Each area is a constant area having an area slightly larger than the actual size of the diffraction image, and the imaging position moves from the design position due to the error in the positional relationship between the laser, the image sensor, and the CGH as the characteristics of the CGH. It is possible to absorb this.
[0045]
The reading operation will be described step by step.
When the current optical card is scanned by a reader, the diffraction image of the information CGH connected on the image sensor is assumed to be the area shown in FIG.
The reader recognizes that the position of the diffraction image generated by the information CGH currently irradiated with the laser light is not the area of FIG. 10 (1) -2 but the area of FIG. 10 (1) -1. I have to do it. That is, it is necessary to determine which of the two types of information CGH arranged alternately is currently irradiated with the laser beam.
In the present embodiment, the above determination is performed by the following configuration.
[0046]
As described with reference to FIG. 3 in the configuration of the prior art, in the control CGH column, two types of control CGH are alternately arranged, and two signals output from the PD (7c) receiving light (PD A, FIG. The trigger signal obtained by binarizing the difference signal of PDB) with a predetermined threshold has rising and falling points as shown in FIG. The rising point is output at a timing corresponding to one of the information CGH, and the falling point is output at a timing corresponding to the other.
[0047]
Therefore, the control unit (12a) of the recognition unit can easily discriminate between the two types of information CGH by checking the trigger signal in the timing signal and detecting whether it is a rising point or a falling point. Is possible.
[0048]
Alternatively, it can be determined by other configurations.
For example, the control CGH row has a starting point where the laser beam is first irradiated when the card is conveyed from one end, and the type of information CGH in the initial state where the starting point is irradiated is determined in advance. After that, the type of information CGH may be alternately switched according to the output of the timing signal (taken control signal in FIG. 3) output according to the conveyance.
[0049]
The control unit (12a) inside the recognition unit (8e) shown in FIG. 12 is connected to an area (in this description, (9a) (9c) ( Only the signals 9e) and (9g)) are extracted from the imaging signal.
That is, the addition enable signal to the adder / subtractor circuit 1 is turned on only when the signal of the area 9a is input, and the signal is accumulated in the adder / subtractor circuit 1 among the image signals of the entire image pickup surface that are sequentially input on the scanning lines. Similarly, the addition enable signal to the addition / subtraction circuit 2 is turned on only when the area 9c is input, and the signal is accumulated in the addition / subtraction circuit 2. Similarly, the addition enable signal to the addition / subtraction circuit 3 is turned on only when the area 9 e is input, and the signal is accumulated in the addition / subtraction circuit 3. Similarly, the addition enable signal to the addition / subtraction circuit 4 is turned on only when the area 9g is input, and the signal is accumulated in the addition / subtraction circuit 4.
[0050]
As described above, in the recognition unit (8e), only the information CGH (X) -1 areas (9a) (9c) (9e) (9g) are obtained in real time from the image data of the entire imaging surface captured sequentially in the scanning lines. And the noise area data are subtracted at the same time.
[0051]
The signals of only the areas (9a), (9c), (9e), and (9g) connected by the normal diffraction image by the enable signal are added, and the areas (9b), (9d), (9f), and (9h) are added by the adjacent information hologram pattern. It is possible to extract only signals that do not contain unnecessary signals (crosstalk signals) from the diffraction image generated in (1).
The obtained signal is compared with a predetermined threshold value K, and “1” and “0” of each data is determined and quantization is performed.
Here, the threshold value K is desirably set to a value having a margin in consideration of variations that cannot be absorbed by the noise area data to be subtracted.
[0052]
When the card is transported and the next timing signal is input, signal addition and quantization are similarly performed using information CGH (X) -2 area (9b) (9d) (9f) (9h).
CGH (X) means CGH (1), CGH (2), CGH (3), and CGH (4).
[0053]
In this case as well, the addition enable signal is issued only for the areas (9b), (9d), (9f), and (9h) connected by the regular diffraction images, and mixing of signals (crosstalk) in adjacent areas is prevented. The
That is, in order to extract only the signals of the areas (9b), (9d), (9f), and (9h) from the image pickup signal, the addition / subtraction circuit 1 is applied only when the area 9b is input, among the image pickup signals of the entire image pickup surface sequentially input by the scanning lines. The addition enable signal is turned on, and the signal is accumulated in the addition / subtraction circuit 1. Similarly, the addition enable signal to the addition / subtraction circuit 2 is turned on only when the area 9d is input, and the signal is accumulated in the addition / subtraction circuit 2. Similarly, the addition enable signal to the addition / subtraction circuit 3 is turned on only when the area 9f is input, and the signal is accumulated in the addition / subtraction circuit 3. Similarly, the addition enable signal to the addition / subtraction circuit 4 is turned on only when the area 9h is input, and the signal is accumulated in the addition / subtraction circuit 4.
[0054]
Since the above configuration is adopted, the influence of the information CGH adjacent in the card transport direction (the X direction in FIG. 5) does not affect the own area, thereby preventing crosstalk and improving the reliability of the data in the own area. , Reading errors and misrecognition can be prevented.
[0055]
The read data is sequentially stored in a storage unit (not shown) and displayed on the liquid crystal panel (6d) attached to the housing (6a). It is also possible to display on a display screen of a personal computer installed outside the reading device via the PC interface (6e).
A storage unit with a larger storage capacity is provided in the reading device to store the captured image data, the reading device displays only the read signal, and the image data is imported to an external personal computer as necessary. You may make it look at an image.
In this case, the pattern of the diffracted image of the information CGH is made to represent a specific shape, for example, a logo mark indicating the brand of the product, rather than a substantially dot, and a system for simple recognition with a reading device and more detailed pattern recognition with a personal computer is constructed. It is also possible to do.
[0056]
Further, by configuring the recognition unit (8e) with hardware such as a programmable FPGA that can be changed by software download from the terminal of the communication line or exchange of the internal ROM, for example, information CGH as in the optical card shown in FIG. Even when the row is changed from 4 rows to 3 rows and the specification of the card having the diffraction characteristics (diffractive image arrangement structure) shown in FIG. 14 is changed, it is possible to easily change the area from which signals are cut out. Become. In FIG. 14, the noise area is different from other areas, but the area is the same.
[0057]
Note that the configuration of the embodiment described above is one embodiment of the present invention, and other configurations are naturally possible for the configuration of the CGH array on the card surface and the setting of the area in the imaging surface. Of course, the description is not limited.
The CGH may be configured to generate a transmission diffraction image instead of a reflection diffraction image, and is included in the present invention.
[0058]
Further, the timing information recording area (5b) of the present invention described above is formed on the card or inside the card as a series of hologram patterns with a large number of timing information. However, the present invention is not limited thereto, and timing information recording occurs. Means can be configured.
For example, a light-shielding pattern in which slits at equal intervals, such as a barcode, are provided in a continuous manner is formed on the card, and a timing signal is obtained by scanning the light-shielding pattern using an optical scanning means such as a photo interrupter. It is good also as a structure.
[0059]
Alternatively, as another configuration, the reader is configured to convey the card by motor driving instead of manually conveying the driving pulse current (voltage) waveform of the stepping motor as a driving source, or the rotation of the motor, the card An encoder that outputs a signal that changes according to movement or the like may be provided to obtain timing information (timing signal) from the encoder output signal.
[0060]
In addition, although the card is provided with a timing information recording area (5b) (control CGH) in which a large number of hologram patterns are continuous as in the configuration of the present embodiment described above, it is formed in response to laser light irradiation. Instead of using a dedicated PD as means for receiving the diffraction image, the diffraction pattern of the control CGH may also be received on the imaging surface of the imaging device that receives the diffraction image of the information CGH.
[0061]
As described above, the specific configuration can be realized in various modes, but timing information generating means for generating timing information that changes in accordance with card transfer or switching of an information recording hologram pattern to be scanned. Each of the holograms in the information recording area by cutting out from the imaging signal a signal related to the diffraction image generated on the divided area of the imaging surface identified based on the position information and the discrimination information using the timing information Since it is configured to have a diffraction image signal output means for outputting a diffraction image signal related to the diffraction image of the pattern, the reading apparatus of the present invention is an information hologram for scanning the recording position of the diffraction image representing information on the imaging surface or an optical recording medium. It is also effective to obtain a read signal with crosstalk suppressed by changing according to the movement of the pattern. , And the present invention and their construction are included.
[0062]
【The invention's effect】
As described above in detail, in the information reading apparatus and the optical recording medium of the present invention, the configuration capable of preventing the influence of crosstalk between adjacent information CGHs and reading data at high speed is simple addition / subtraction. It becomes possible by adding only the circuit, and there is an effect that the reliability and operability of the optical recording card and the card reader device are improved and the cost is reduced.
[0063]
In addition, since the configuration of the reading operation can be configured by hardware, high-speed scanning and real-time recognition of the optical card is possible. Therefore, a flexible configuration in which the optical card is manually transported and read by the reader device is possible, and an effect of expanding the application area of the optical recording medium is added.
[0064]
That is,
“(Claim 1)
When reading information from an information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to monochromatic light irradiation are arranged in series, and a large number of hologram patterns in the information recording area A timing information recording area in which a number of timing information to be used is recorded as a series of hologram patterns. Each hologram pattern in the information recording area can generate a diffraction image on each divided area obtained by dividing the imaging surface into a plurality of areas. As such, an optical recording medium having a configuration in which different types of hologram patterns are arranged adjacent to each other,
An information reading device that reads information from a hologram pattern in the information recording area while being conveyed in the arrangement direction of the hologram pattern in the information recording area,
Irradiation means for sequentially irradiating each hologram pattern in the information recording area and each hologram pattern in the timing information recording area at a position corresponding to each hologram pattern in the information recording area,
An imaging signal output means for generating and outputting an imaging signal including a diffraction image generated based on reception of diffracted light of monochromatic light applied to each hologram pattern in the information recording area;
Timing information output means for outputting timing information based on reception of diffracted light of monochromatic light irradiated to each hologram pattern in the timing information recording area;
Storage means for storing the position information of each divided area on the imaging surface in association with different types of hologram patterns in the information recording area;
Discrimination information output means for outputting discrimination information for discriminating different types of hologram patterns in the information recording area irradiated with monochromatic light;
Using the timing information, by cutting out a signal related to the diffraction image generated on the divided area specified based on the position information and the discrimination information from the imaging signal, each information recording area An information reading apparatus for an optical recording medium, comprising: a diffraction image signal output unit that outputs a diffraction image signal related to a diffraction image of a hologram pattern. Therefore, an effect of providing an information reading device for an optical recording medium in which crosstalk is prevented can be obtained.
[0065]
Also,
“(Claim 2)
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to irradiation of monochromatic light are arranged in series and a plurality of the series of hologram pattern rows are arranged in parallel, and the information recording area Timing information recording area in which a large number of timing information used when reading information from a large number of hologram patterns is recorded as a series of hologram patterns, and each hologram pattern constituting each hologram pattern row in the information recording area is An optical recording medium having a configuration in which different types of hologram patterns are arranged adjacent to each other so that a diffraction image can be generated on each divided area obtained by dividing the imaging surface into a plurality of areas,
An information reading device that reads out information from each hologram pattern row in the information recording area by irradiating monochromatic light so as to straddle all the hologram pattern rows while being conveyed in the arrangement direction of the hologram pattern rows in the information recording area There,
Each hologram pattern constituting each hologram pattern row in the information recording area and each hologram pattern in the timing information recording area at a position corresponding to each hologram pattern constituting each hologram pattern row in the information recording area And irradiation means for sequentially irradiating monochromatic light,
Imaging signal output for generating and outputting an imaging signal including a diffraction image generated based on reception of diffracted light of monochromatic light irradiated to each hologram pattern constituting each hologram pattern row in the information recording area from the imaging surface Means,
Timing information output means for outputting timing information based on reception of diffracted light of monochromatic light irradiated to each hologram pattern in the timing information recording area;
Storage means for storing position information of each of the divided areas on the imaging surface in association with different types of hologram patterns constituting the hologram pattern rows of the information recording area;
Discriminating information output means for outputting discriminating information for discriminating different types of hologram patterns constituting the hologram pattern rows of the information recording area irradiated with monochromatic light;
Using the timing information, the signal related to the diffraction image generated on the divided area specified based on the position information and the discrimination information is cut out from the imaging signal, thereby the information recording area An information reading apparatus for an optical recording medium, comprising: a diffraction image signal output unit that outputs a diffraction image signal related to a diffraction image of each hologram pattern constituting each hologram pattern row. Therefore, an information reading apparatus for an optical recording medium in which crosstalk is prevented is provided, and the effect of realizing a CGH card with a large amount of information is added because the information CGH is in a plurality of columns.
[0066]
Also,
“(Claim 3)
An information reading device for an optical recording medium according to claim 1 or 2,
The storage means
An information reading apparatus for an optical recording medium, wherein the position information can be rewritten and changed in accordance with an arrangement structure of each hologram pattern in the information recording area in the optical recording medium. Therefore, even when the CGH card specifications are changed for performance improvement or when the CGH cards having a plurality of different specifications are used in combination, the information reading apparatus can easily cope with the effect.
[0067]
Also,
“(Claim 4)
An optical recording medium used in the information reading apparatus for an optical recording medium according to claim 1,
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in accordance with irradiation of monochromatic light are arranged in series,
A timing information recording area in which timing information used when reading information from a number of hologram patterns in the information recording area is recorded as a series of hologram patterns;
Each hologram pattern of the information recording area is characterized in that different types of hologram patterns are arranged adjacent to each other so that a diffraction image can be generated on each divided area obtained by dividing the imaging surface into a plurality of parts. Optical recording media. Therefore, there is an effect of providing an optical recording medium that prevents crosstalk.
[0068]
Also,
“(Claim 5)
An optical recording medium used in the information reading apparatus for an optical recording medium according to claim 2,
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to irradiation of monochromatic light are arranged in series and a plurality of the series of hologram pattern rows are arranged in parallel,
A timing information recording area in which timing information used when reading information from a number of hologram patterns in the information recording area is recorded as a series of hologram patterns;
Each hologram pattern constituting each hologram pattern row in the information recording area has different types of hologram patterns adjacent to each other so that a diffracted image can be generated on each divided area obtained by dividing the imaging surface. An optical recording medium which is arranged. Therefore, it is possible to provide an optical recording medium for preventing crosstalk and to provide an optical recording medium having a larger amount of information because the information CGH is composed of a plurality of columns.
[Brief description of the drawings]
FIG. 1 is a plan view of a CGH card according to the prior art.
FIG. 2 is an explanatory diagram of an information reading operation in a conventional CGH card.
FIG. 3 is a timing chart of tracking signals in a conventional CGH card and reading device.
FIG. 4 is an explanatory diagram of crosstalk in a conventional CGH card.
FIG. 5 is a plan view of a CGH card according to an embodiment of the present invention.
FIG. 6 is a schematic external view of a reading apparatus according to an embodiment of the present invention.
FIG. 7 is an explanatory diagram of an information reading operation performed by the CGH card and the reading device according to the embodiment of the present invention.
FIG. 8 is a block diagram of a CGH card reader according to an embodiment of the present invention.
FIG. 9 is a plan view of an imaging surface of a CGH card reading device according to an embodiment of the present invention.
FIG. 10 is an explanatory diagram of an information reading operation of the CGH card reading device according to the embodiment of the present invention.
FIG. 11 is an explanatory diagram of an information reading operation of the CGH card reading device according to the embodiment of the present invention.
FIG. 12 is a block diagram of a recognition unit in the CGH card reading apparatus according to the embodiment of the present invention.
FIG. 13 is a plan view of another configuration example of the CGH card according to the embodiment of the present invention.
FIG. 14 is a plan view of another configuration of the imaging surface of the CGH card reader according to the embodiment of the present invention.
[Explanation of symbols]
5a1, 5a2, 5a3, 5a4 Information CGH (information recording area)
5b Control CGH (timing information recording area)
7a Laser (irradiation means)
7b CMOS sensor (imaging signal output means)
7c PD (timing information output means)
8e recognition unit (storage means, diffraction image signal output means)
9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h Information CGH area (divided area)
12a Control unit in recognition unit (discrimination information output means)
90 Imaging surface

Claims (5)

When reading information from an information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to monochromatic light irradiation are arranged in series, and a large number of hologram patterns in the information recording area A timing information recording area in which a number of timing information to be used is recorded as a series of hologram patterns. Each hologram pattern in the information recording area can generate a diffraction image on each divided area obtained by dividing the imaging surface into a plurality of areas. As such, an optical recording medium having a configuration in which different types of hologram patterns are arranged adjacent to each other,
An information reading device that reads information from a hologram pattern in the information recording area while being conveyed in the arrangement direction of the hologram pattern in the information recording area,
Irradiation means for sequentially irradiating each hologram pattern in the information recording area and each hologram pattern in the timing information recording area at a position corresponding to each hologram pattern in the information recording area,
An imaging signal output means for generating and outputting an imaging signal including a diffraction image generated based on reception of diffracted light of monochromatic light applied to each hologram pattern in the information recording area;
Timing information output means for outputting timing information based on reception of diffracted light of monochromatic light irradiated to each hologram pattern in the timing information recording area;
Storage means for storing the position information of each divided area on the imaging surface in association with different types of hologram patterns in the information recording area;
Discrimination information output means for outputting discrimination information for discriminating different types of hologram patterns in the information recording area irradiated with monochromatic light;
Using the timing information, by cutting out a signal related to the diffraction image generated on the divided area specified based on the position information and the discrimination information from the imaging signal, each information recording area An information reading apparatus for an optical recording medium, comprising: a diffraction image signal output unit that outputs a diffraction image signal related to a diffraction image of a hologram pattern. An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to irradiation of monochromatic light are arranged in series and a plurality of the series of hologram pattern rows are arranged in parallel, and the information recording area Timing information recording area in which a large number of timing information used when reading information from a large number of hologram patterns is recorded as a series of hologram patterns, and each hologram pattern constituting each hologram pattern row in the information recording area is An optical recording medium having a configuration in which different types of hologram patterns are arranged adjacent to each other so that a diffraction image can be generated on each divided area obtained by dividing the imaging surface into a plurality of areas,
An information reading device that reads out information from each hologram pattern row in the information recording area by irradiating monochromatic light so as to straddle all the hologram pattern rows while being conveyed in the arrangement direction of the hologram pattern rows in the information recording area There,
Each hologram pattern constituting each hologram pattern row in the information recording area and each hologram pattern in the timing information recording area at a position corresponding to each hologram pattern constituting each hologram pattern row in the information recording area And irradiation means for sequentially irradiating monochromatic light,
Imaging signal output for generating and outputting an imaging signal including a diffraction image generated based on reception of diffracted light of monochromatic light irradiated to each hologram pattern constituting each hologram pattern row in the information recording area from the imaging surface Means,
Timing information output means for outputting timing information based on reception of diffracted light of monochromatic light irradiated to each hologram pattern in the timing information recording area;
Storage means for storing position information of each of the divided areas on the imaging surface in association with different types of hologram patterns constituting the hologram pattern rows of the information recording area;
Discriminating information output means for outputting discriminating information for discriminating different types of hologram patterns constituting the hologram pattern rows of the information recording area irradiated with monochromatic light;
Using the timing information, the signal related to the diffraction image generated on the divided area specified based on the position information and the discrimination information is cut out from the imaging signal, thereby the information recording area An information reading apparatus for an optical recording medium, comprising: a diffraction image signal output unit that outputs a diffraction image signal related to a diffraction image of each hologram pattern constituting each hologram pattern row. An information reading device for an optical recording medium according to claim 1 or 2,
The storage means
An information reading apparatus for an optical recording medium, wherein the position information can be rewritten and changed in accordance with an arrangement structure of each hologram pattern in the information recording area in the optical recording medium. An optical recording medium used in the information reading apparatus for an optical recording medium according to claim 1,
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in accordance with irradiation of monochromatic light are arranged in series,
A timing information recording area in which timing information used when reading information from a number of hologram patterns in the information recording area is recorded as a series of hologram patterns;
Each hologram pattern of the information recording area is characterized in that different types of hologram patterns are arranged adjacent to each other so that a diffraction image can be generated on each divided area obtained by dividing the imaging surface into a plurality of parts. Optical recording media. An optical recording medium used in the information reading apparatus for an optical recording medium according to claim 2,
An information recording area in which a large number of hologram patterns for generating a diffraction image on a predetermined imaging surface in response to irradiation of monochromatic light are arranged in series and a plurality of the series of hologram pattern rows are arranged in parallel,
A timing information recording area in which timing information used when reading information from a number of hologram patterns in the information recording area is recorded as a series of hologram patterns;
Each hologram pattern constituting each hologram pattern row in the information recording area has different types of hologram patterns adjacent to each other so that a diffracted image can be generated on each divided area obtained by dividing the imaging surface. An optical recording medium which is arranged.

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