JP2000047557A - Optical recording medium and information reader for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording medium and an information reader for the same with which data can be read or erased efficiently at high speed from the optical recording medium two-dimensionally arranging plural hologram patterns. SOLUTION: Separately from plural hologram patterns 12 recording original data (main signals), plural hologram patterns 13 for applying tracking signals (sub signals) are arranged, the tracking signals are generated by receiving light beams diffracted by the plural hologram patterns for applying tracking signals through light receiving elements 30A and 30B and while using these tracking signals, the timing to read the main signals and/or the position of the optical recording medium in the Y direction and/or X direction is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium and an information reading apparatus for the optical recording medium, and more particularly to an optical recording medium suitable for a prepaid card, a credit card, a certification card and the like, and a reader therefor.

[0002]

2. Description of the Related Art Various types of cards are used. As a prepaid card, a credit card, a certification card, etc., those using a conventional magnetic recording medium are easily forged,
Since it can be tampered with, a card-type optical recording medium has attracted attention as an alternative to this, and among them, a hologram-based optical recording medium has been given particular importance as being effective for forgery and falsification.

Prior to the present invention, the present applicant has already developed an optical recording medium in which a plurality of hologram patterns are arranged as CGH (computer generated hologram) on one substrate, and has filed a patent application (Japanese Patent Application Laid-Open No. HEI 9-197572). 10-
No. 143603). In this optical recording medium, 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. In order to read recorded data from such an optical recording medium, the optical recording medium is transported in the Y direction, and a plurality of hologram patterns arranged in the X direction are irradiated with light beams, respectively, and projected by the transmitted or reflected diffraction light. The recording data is read from the light beam pattern to be reproduced or the reproduced image to be projected.

[0004]

However, in order to increase the data recording density, the CGH is, for example, 100 to
Since it is configured as a size of 300 μm square or smaller, it is necessary to accurately irradiate each CGH with a light beam, and to set the reading timing when transmitting and reflecting diffracted light is received by a light receiving element and read. Otherwise, data could not be read quickly and efficiently. Also,
In prepaid cards, etc., data is erased by destroying a predetermined hologram pattern by applying heat or hitting according to the amount of money used, but it is necessary to precisely control the timing of data erasure, As described above, simply controlling the erasing timing depending on the outer diameter of the optical recording medium has a limit in accuracy and has been a bottleneck for speeding up.

SUMMARY OF THE INVENTION Accordingly, the present invention provides an optical recording medium and an optical recording medium which can read and erase data at high speed and efficiently from an optical recording medium in which a plurality of hologram patterns are two-dimensionally arranged. An object of the present invention is to provide a medium information reader.

[0006]

In order to achieve the above-mentioned object, according to the present invention, a plurality of hologram patterns for providing a tracking signal (sub signal) are provided separately from a plurality of hologram patterns for recording original data (main signal). Arranged, light beams diffracted by a plurality of hologram patterns providing a tracking signal are received by a light receiving element to generate a tracking signal, and using this, a main signal reading timing and / or a Y direction of an optical recording medium and / or The position in the X direction is controlled.

That is, according to the present invention, a plurality of hologram patterns are arranged in a predetermined direction as information recording areas, and when loaded into a predetermined optical recording medium information reading apparatus, are transported at least in the predetermined direction. An optical recording medium is provided, wherein a plurality of hologram patterns for providing a tracking signal are arranged separately from the plurality of hologram patterns in an optical recording medium configured to read recorded information.

According to the present invention, a plurality of hologram patterns are two-dimensionally arranged in the Y direction and the X direction as an information recording area, and at least when the hologram pattern is loaded into a predetermined optical recording medium information reading apparatus. In an optical recording medium configured to be conveyed in the Y direction and read recording information, a plurality of holograms in which one row of the plurality of hologram patterns in the Y direction provides a tracking signal instead of the information of the plurality of hologram patterns An optical recording medium characterized by being arranged in an array of patterns is provided.

According to the present invention, a plurality of hologram patterns are arranged as information recording areas at a predetermined row pitch in the Y direction and at a predetermined column pitch in the X direction, and are loaded in a predetermined information reading apparatus for an optical recording medium. In the optical recording medium configured to be conveyed at least in the Y direction and read the recorded information, the length in the Y direction is １ ／ of the row pitch separately from the plurality of hologram patterns. And an optical recording medium characterized in that two kinds of hologram patterns for providing a tracking signal are alternately and continuously arranged in the Y direction.

According to the present invention, a plurality of hologram patterns are arranged as information recording areas at a predetermined row pitch in the Y direction and at a predetermined column pitch in the X direction, and are loaded in a predetermined information reading apparatus for an optical recording medium. In the optical recording medium configured to be conveyed at least in the Y direction and read out the recording information, the length in the X direction is の of the column pitch separately from the plurality of hologram patterns. Wherein a plurality of hologram patterns for providing a tracking signal are continuously arranged in the Y direction.

According to the present invention, a plurality of hologram patterns are arranged as information recording areas at a predetermined row pitch in the Y direction and at a predetermined column pitch in the X direction, and are loaded in a predetermined information reading apparatus for an optical recording medium. In the optical recording medium configured to be conveyed at least in the Y direction and read out the recording information, the length in the X direction is set to １ ／ of the column pitch separately from the plurality of hologram patterns. Wherein a plurality of hologram patterns for providing a tracking signal are continuously arranged in the Y direction.

According to the present invention, a plurality of hologram patterns are arranged as information recording areas in a predetermined direction, and a plurality of hologram patterns for providing a tracking signal are arranged separately from the plurality of hologram patterns. An information reading apparatus for reading information from an optical recording medium, comprising: means for irradiating a hologram pattern in the information recording area and a hologram pattern for providing the tracking signal with a predetermined light beam; and a hologram pattern in the information recording area. A first diffracted light receiving means having a plurality of light receiving elements arranged two-dimensionally so as to be able to receive the diffracted light in a predetermined direction diffracted by the first means; and decoding information detected by the diffracted light receiving means. Means for reading recorded information of the diffraction grating, and a plurality of holograms for providing the tracking signal Second diffracted light receiving means capable of respectively receiving a plurality of diffracted lights in different directions diffracted by the system pattern, conveying means for conveying the optical recording medium in a predetermined direction, and second diffracted light receiving means. An information reading device for an optical recording medium, comprising: control means for controlling read timing in the first diffracted light receiving means in response to an output signal.

According to the present invention, a plurality of hologram patterns are arranged in a predetermined direction as information recording areas, and a plurality of hologram patterns for providing a tracking signal are arranged separately from the plurality of hologram patterns. An information reading apparatus for reading information from an optical recording medium, comprising: means for irradiating a hologram pattern in the information recording area and a hologram pattern for providing the tracking signal with a predetermined light beam; and a hologram pattern in the information recording area. A first diffracted light receiving means having a plurality of light receiving elements arranged two-dimensionally so as to be able to receive the diffracted light in a predetermined direction diffracted by the first means; and decoding information detected by the diffracted light receiving means. Means for reading recorded information of the diffraction grating, and a plurality of holograms for providing the tracking signal Second diffracted light receiving means capable of respectively receiving a plurality of diffracted lights in different directions diffracted by the system pattern, conveying means for conveying the optical recording medium in a predetermined direction, and second diffracted light receiving means. A control unit for controlling the transport speed of the optical recording medium by the transport unit in response to an output signal.

According to the invention, a plurality of hologram patterns are arranged in a predetermined direction as an information recording area, and a plurality of hologram patterns for providing a tracking signal are arranged separately from the plurality of hologram patterns. An information reading apparatus for reading information from an optical recording medium, comprising: means for irradiating a hologram pattern in the information recording area and a hologram pattern for providing the tracking signal with a predetermined light beam; and a hologram pattern in the information recording area. A first diffracted light receiving means having a plurality of light receiving elements arranged two-dimensionally so as to be able to receive the diffracted light in a predetermined direction diffracted by the first means; and decoding information detected by the diffracted light receiving means. Means for reading recorded information of the diffraction grating, and a plurality of holograms for providing the tracking signal Second diffracted light receiving means capable of respectively receiving a plurality of diffracted lights in different directions diffracted by the system pattern, conveying means for conveying the optical recording medium in the Y and X directions, and the second diffracted light. A control unit for controlling the position of the optical recording medium in the X direction by the transport unit in response to an output signal of a light receiving unit.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an optical recording medium according to the present invention embodied as a business card-sized card (a prepaid card, an identification card, or the like), and shows a first embodiment. Card 10
Are a plurality of information recording areas 12 as optical recording areas and a plurality of tracking signal recording areas 13 on the surface or inside thereof.
In each of the recording areas 12 and 13, interference fringes of a hologram are recorded. The information recording area 12 is a part for recording main information, and the tracking signal recording area 13 is a part for recording a tracking signal. In addition,
The tracking signal is a higher-level concept signal of a timing signal for reading information from the optical recording medium and a transport speed signal of the optical recording medium, as described later. The interference pattern of the hologram is one mode of the diffraction grating, and the diffraction grating will be examined here. The relationship between the optical diffraction grating pitch p and the diffraction angle θ is given by

[0016]

[Expression 1] ± n sin θ = λ / p (1) n is represented by a natural number including 0. When n = 0, it is transmitted or reflected light of non-diffracted light, which is called zero-order diffracted light. On the other hand, when ± n, ordinary optical system (symmetric optical system)
Then, the diffracted light amounts are equal. As n increases, the amount of higher-order diffracted light decreases. Considering only n = 1, three light velocities are generated from the diffraction grating.

In the case of a parallel diffraction grating, one-dimensional diffracted light is generated. If only the positive direction of ± is discussed, it can be said that only one diffracted light is generated. For example, JP-A-5-50788
In the technique disclosed in the publication, a plurality of diffraction grating groups having different arrangement angles and pitches of diffraction gratings are simultaneously irradiated to obtain a plurality of diffraction lights, and a detection pattern is recognized using the diffraction lights. In the present invention, a CGH (computer) is created by using a computer to create a grating that is arranged in a specific pattern in both the horizontal and vertical directions instead of a parallel diffraction grating and to arrange the diffracted light two-dimensionally.・ Generated hologram). The hologram used in the present invention is, for example, a monthly magazine “Oplus E” (published by Shin-Tech Communications Inc .; No. 20).
4: November 1996) can be used.

FIG. 6 shows a method of manufacturing a master optical recording medium using CGH, which was developed by the present inventors prior to the present invention and which was applied for a patent (Japanese Patent Application Laid-Open No. 10-143929), and information transfer to the optical recording medium. FIG. 2 is a block diagram schematically illustrating a recording method, an optical recording medium manufacturing apparatus, and a manufacturing method. This example
Prepaid card 10A as card type optical recording medium
Is to manufacture. The prepaid card 10A is provided with a plurality of recording portions (information recording areas) 12,
Are arranged. Now, assuming that character information is to be recorded in each of the recording portions 12, a signal of the character information is supplied to the input terminal IN1 and input to the image signal conversion circuit 50. The image signal conversion circuit 50 converts the character represented by the code information of the input digital signal into an image signal of a dot pattern of a two-dimensional image (input data of FIG. 7A described later).
Convert to

This image signal is supplied to a numerical operation device 54 via a switch 52 or a multiplexer. The numerical calculation device 54 obtains a numerical value for obtaining an interference fringe pattern (holographic interferogram) of the hologram from the image signal of the dot pattern of the two-dimensional image using a predetermined algorithm without irradiating interference light. FIG. 7A is a diagram showing a procedure for obtaining an interference fringe pattern of a hologram from a two-dimensional image. Preferably, a computer capable of high-speed operation is used as the numerical operation device. FIG. 7 (b) shows a CGH obtained by creating a grid arranged in a specific pattern in both the horizontal and vertical directions used in the present invention, and performing computation using a computer so that the diffracted light is arranged two-dimensionally. 4 is a photograph showing an example of the result of the generation.

The numerical operation device 54 is configured to output coordinate data corresponding to the resolution of an electron beam exposure device 58 which is a drawing device described later. Before actually performing drawing, coordinate data obtained by numerical operation is fed back and compared with input data, and recalculation is performed a plurality of times to reduce an error between the two.

The output signal of the numerical operation device 54 is converted into a signal of a predetermined format by an encoder 56 and input to an electron beam exposure device 58. The electron beam exposure device 58 is originally used to draw a circuit arrangement pattern when an IC or LSI is manufactured. Here, the pattern (output data) of the interference fringes shown in FIG. It is used for drawing on the primary recording medium 60. The primary recording medium 60 is referred to as a primary recording medium 60 to distinguish it from the optical recording medium 10A which is a final product. As the primary recording medium 60, a medium in which a photoresist as a photosensitive resin as a medium to be exposed is applied on a substrate such as glass is used. The primary recording medium 60 is mounted on a stepper 62 (stage controller), and the stepper 62 receives an electron beam 66 from a signal from an electron beam exposure device 58.
Can be moved in two directions X-Y on a plane perpendicular to. It should be noted that drawing by an electron beam is compared with drawing by a laser beam used for manufacturing a conventional optical recording medium.
It is possible to draw an extremely delicate and precise pattern, and it can be said that this is suitable for drawing a pattern of interference fringes of a hologram.

The primary recording medium 60 is processed as a photomask master, a plurality of secondary recording media are produced from the primary recording medium 60 by light exposure from the photomask master, and the secondary recording medium is used as a master. It is also possible to manufacture an optical recording medium 10A as a final product through an optical disk manufacturing process.

If it is assumed that data consisting of 300 English characters (including numbers) is to be recorded on the prepaid card, character string data serially input from the input terminal IN1 is sequentially transmitted to the image signal conversion circuit 50. It is converted into an image signal, subjected to a numerical operation process by a predetermined algorithm in a numerical operation device 54, converted into data of a predetermined format by an encoder 56, supplied to an electron beam exposure device 58, and deflected by an electron beam 66. Then, drawing is performed on the primary recording medium 60. At this time, the electron beam exposure device 58
Controls the stepper 62 so that the 300 recording portions 12 are in three rows, and the electron beam 6 is arranged such that 100 recording portions are arranged in each row.
The primary recording medium 60 is moved in the XY direction on a plane perpendicular to 6.

FIG. 2 shows an optical recording medium 10 having an information recording area 12 and a tracking signal recording area 13, ie,
A light source 16 is provided on the diffraction grating (hologram patterns 12 and 13).
FIG. 7 is a schematic diagram showing a diffraction state of transmitted light when a plurality of light beams obtained by dispersing a light beam (laser beam) having a single wavelength from the beam splitter 26 by a beam splitter 26 are irradiated. In the illustrated example, light is transmitted through the optical recording medium 10. However, if a reflective film is provided on the information recording area 12 and the tracking signal recording area 13 of the optical recording medium 10 and designed to reflect incident light, As shown in FIG. 3, diffracted reflected light can be obtained instead of transmitted light. Where the diffraction angle θ and the irradiation wavelength λ
Is represented by the aforementioned equation (1). FIG. 2, FIG.
, A light receiving element 20, which is a two-dimensional CCD, is provided for receiving transmitted diffraction light or reflected diffraction light from the information recording area 12, and a tracking signal recording area 13 is provided.
There are provided two light receiving elements 30A and 30B for receiving the transmitted diffraction light or the reflected diffraction light from. The information recording area 12 and the tracking signal recording area 13 are designed such that the respective diffracted lights form two-dimensionally different positions in the design stage.

FIG. 4 is a schematic partial enlarged plan view of the first embodiment of the optical recording medium of the present invention. Optical recording medium 10
Are provided in the X direction, the Y direction.
Each of the plurality of tracking signal recording areas 13 provided on the optical recording medium 10 is represented by a square whose inside is indicated by a parallel line. Are represented by squares. The tracking signal recording areas 13 are arranged in the Y direction, are located at a position distant from the information recording area 12, and are located on an extension of a central row of a plurality of rows in the Y direction of the information recording area 12. In the tracking signal recording area 13, two types of diffraction gratings 13A and 13B having different diffraction directions are alternately arranged.

FIG. 5 shows two types of diffraction gratings 13 shown in FIG.
Four types of diffraction gratings 1 having different diffraction directions including A and 13B
It is a diagram showing the types of 3A, 13B, 13C, 13D,
Four types of CHGA, CGH B, CGH C, and CGH D are shown. These four types of diffraction gratings 13A, 1
3B, 13C, and 13D are represented by parallel lines in the same direction in the other embodiments shown in FIG. 14 and subsequent figures.

In the first embodiment shown in FIG. 4 and each embodiment shown in FIG. 14, each hologram pattern (CGH)
Have a size of 0.25 mm square and are arranged at equal intervals of 0.5 mm. In FIG. 4, the horizontal direction is a main transport direction of the optical recording medium 10 in an optical recording medium information reading device described later, and is defined as a Y direction. The vertical direction is a sub-transport direction in the information reading device for an optical recording medium, and is defined as an X direction. The optical recording medium of the present invention is loaded into the optical recording medium information reading apparatus shown in FIG. 2 or FIG. 3, and a plurality of light beams obtained by the beam splitter 26 are sequentially irradiated on the information recording area 12 and the tracking signal recording area 13. When done, these rays are diffracted as shown. That is, the light beam diffracted in the information recording area 12 is incident on the light receiving surface of the CCD 20, which is the first light receiver, and the light beam diffracted in the tracking signal recording areas 13A and 13B is the second light beam.
The light enters the light receiving surfaces of the light receiving devices and the CCDs 30A and 30B as the third light receiving devices, respectively. That is, the optical recording medium 10
At the design stage, the tracking signal recording area 13A,
The directions of diffraction at 13B are different from each other. Output signals of the CCDs 30A and 30B are used for various controls described later by the circuit shown in FIG.

When light is irradiated to all (100%) of the area of CGH A, a signal of 100% level is output from the second light receiver 30A, and similarly, all (100%) of the area of CGH B is output. When the light is irradiated, the third light receiver 30B
Output a signal of 100% level. When these output signals are amplified by the amplifiers 33A and 33B shown in FIG. 22 and supplied to the difference calculation circuit 35, a difference signal (ab) between the two signals a and b is obtained. When the optical recording medium 10 is transported in the Y direction and both CGH A and CGH B are irradiated with the same amount of light, a signal of the same level is generated from the second light receiver 30A and the third light receiver 30B, The value of the difference signal (ab) is exactly zero. As the light travels relatively from CGH A to CGH B, the difference signal changes from positive to negative, while as the light travels from CGH B to CGH A, the difference signal changes from negative to positive. The timing of crossing the zero level (zero crossing) in the course of this change can be used as the optimum value of the timing for reading information from the CGH in the information recording area 12.

When the optical recording medium 10 is conveyed in the optical recording medium information reading device and successively irradiates a new CGH with light and reads a pattern formed on the CCD 20, the reading timing is set to the maximum value of the diffracted light. Preferably it is possible. In general, a CCD element can read incident light statically for a specific time (hold by a shutter) by an external signal. In order to obtain this read timing, instead of using the output signal of the CCD 20, according to the first aspect of the present invention, when considering the traveling direction of the optical recording medium, the tracking signal is output immediately before the start of the CGH of the information recording area 12. A dedicated CGH for generation, that is, phase adjustment is arranged and detected by the dedicated light receiving elements 30A and 30B. The dedicated light receiving elements 30A and 30B are
In order to avoid the light receiving surface and avoid the zero-order light and arrange it at a position that does not interfere with the incident optical system, as shown in FIG.
It can be seen that the vicinity of the side surface 20 is the optimum position.

C is located at a position off the light receiving surface of the CCD 20.
The conditions for diffracting the GH diffracted light to form an image are shown below. In the configuration shown in FIG. 8, when a light beam enters the CGH on the surface of the optical recording medium at an incident angle θ4, the 0th-order diffraction angle becomes θ.
4 and the diffraction angle depending on the CGH grating pitch is θ
5, and the diffraction angle dependent on the CGH grating rotation angle is represented by θ6. In FIG. 8, point C is the C of the 0th-order diffracted light.
An imaging point on the light receiving surface of the CD 20. FIG. 9 is a schematic partial enlarged view in which a part of FIG. 8 is slightly changed in angle.
X viewed from a reflection point (transmission point in a transmission type CGH) R of an imaging point I due to the light diffracted by the CGH.
The offset angle θX in the direction and the offset angle θY in the Y direction are obtained by the following equations (2) and (3), respectively.

[0031]

(2) θX = θ4−θ5 * cos θ6 (2) θY = θ5 * sinθ6 (3)

Next, the arrangement of two PDs (photodiodes) as the second light receiver 30A and the third light receiver 30B arranged at positions off the light receiving surface of the CCD 20 will be examined. When a 1 mm square element is used as a PD element at a point 10 mm away from the CGH, as shown in the front view of FIG. The light is diffracted in a direction inclined by about 45 degrees from the surface. The distance between the two PDs 30A and 30B is 1 mm, the CCD 20 and the closer PD 30
Assuming that the distance between A is 1 mm, the diffraction angle of the zero-order light with respect to the vertical plane including the optical axis, that is, the angles of the light rays going to the PDs 30A and 30B are 47.86 degrees and 42.14 degrees in the Y direction. The X direction is set to 6.62 degrees, which is the same as that of ordinary CGH first-order diffracted light.

When the CGH is made of polycarbonate (PC), the angles θY of the two PDs 30A and 30B are set to θYa and θYb, respectively.

[0034]

(3) θYa = 28 degrees (4) θYb = 25.13 degrees (5) θX = 4.19 degrees (6)

Assuming that the incident angle is θ4 = 26.59 degrees, the following relational expressions and numerical values can be obtained from the above expressions (2) to (6).

[0036]

Equation 4] ^{(θY / θ5) 2 + (} (θ4-θX) / θ5) 2 = 1 θY 2 + θ4 2 + θX 2 -2 * θ4 * θX = θ5 2 θ5a = 35.7 degrees 0.6228Rad P
= 1.252 μm θ5b = 33.49 degrees 0.5842 rad P
= 1.335 μm θ6 = asin (θY / θ5) θ6a = 51.66 degrees θ6b = 48.63 degrees

Next, the reading and control operations when the optical recording medium according to the first embodiment of FIG. 4 is loaded into the optical recording medium information reader shown in FIGS. 22 and 23 will be described. A light receiving element 30A corresponding to CGH A;
The light receiving element 30B corresponding to CGH B is used for information recording CG.
As described above, it is arranged at a position that does not interfere with the CCD 20 that reads the diffracted light from the H12. The diffracted light generated when the optical recording medium 10 (card) is conveyed and moved and the light beam for reading irradiates CGH A is:
An image is formed on the light receiving section of the light receiving element 30A. When the optical recording medium 10 further moves and CGH B is irradiated with a reading light beam, the diffracted light forms an image on the light receiving portion of the light receiving element 30B.

FIG. 11 shows the tracking signal recording area 1
6 is a timing chart showing the time relationship between output signals of No. 3 and two light receiving elements 30A and 30B, a difference signal thereof, and a CCD readout timing signal generated at a zero-cross timing of the difference signal. FIG. 11A shows FIG.
The tracking signal recording area 13 is shown in FIG.
(C) is a waveform diagram of respective signals obtained by amplifying output signals of the light receiving elements 30A and 30B, (d) is a difference signal of these signals, that is, a waveform of an output signal of the difference calculation circuit 35, (e). Uses the difference signal and the sum signal, that is, the output signal of the sum operation circuit 37, to generate the timing signal
FIG. 6 is a waveform diagram of a read timing signal generated in FIG. The difference signal crosses the 0 level when the reading light beam passes the boundary between different CGHs. The level of the sum signal increases when one of the light receiving elements 30A and 30B is irradiated with light. Therefore, the timing signal generation circuit 3
Reference numeral 4 indicates that the point at which the sum signal crosses the zero level of the difference signal when the difference signal crosses the zero level and the passing direction at the time of the crossing are detected to determine the CCD read timing.

FIG. 12 shows the C as the image sensor 20.
6 is a timing chart of a drive signal when the CD 20 is driven by a conventional method. As shown in FIG. 12, each light receiving element of the CCD 20 is operated by a vertical synchronization signal (Vsync).
Exposure is performed for a necessary time, and then an information signal is output at the timing of the next vertical synchronization signal. For an NTSC TV signal, the vertical synchronizing signal is 60 Hz, and the horizontal synchronizing signal (H
sync) is 15.75 kHz. These timing controls are controlled by an IC generally called TC incorporated in the drive circuit of the CCD 20. Further, this timing can be made coincident with an external synchronization signal. In this case, phase control is performed so that each synchronization signal inside the TC is synchronized with the external vertical synchronization signal and horizontal synchronization signal. The phase change of each of the H and V synchronization signals can follow 360 degrees, but the frequency can usually follow only a fluctuation of about 1%.

In the present invention, in order to read a plurality of hologram patterns at a high speed, a timing signal is generated from the tracking signal recording area 13 so that the reading timing of the CCD 20 and the optimum value of the light amount of the imaging pattern coincide with each other. To control the read timing.
In FIG. 22, the output signal of the timing signal generation circuit 34 is given to the CCD element controller 36 and the transport speed control circuit 46. As shown in FIG.
With the movement of the light, the amount of diffracted light sequentially obtained from each information recording area 12 changes in a sine curve shape. By performing timing control to receive light near the maximum amount of light, accurate and high-speed reading can be performed. Become. In the optical recording medium information reading apparatus of the present invention, the information recording area 12
2, that is, the movement of the optical recording medium 10, will be described later with reference to FIG.
5. This is performed by a mechanical transfer means shown in FIG. In addition, the intervals between the information recording areas 12 arranged on the substrate have an error because they are arranged with mechanical accuracy at the time of manufacturing. For this reason, the generation timing of the optimal light amount from each information recording area 12 constantly fluctuates. Generally, it is difficult to keep the fluctuation accuracy of the absolute speed of conveyance within 1%. With this variation rate, it is difficult to accurately follow the conventional phase control type.

In the present invention, a timing signal is generated from the tracking signal recording area so as to read when the read light amount in each information recording area 12 is optimum, and a read signal, that is, an electronic shutter control signal is generated using the timing signal. Let me. This electronic shutter control signal is used in place of the vertical synchronization signal shown in FIG.
FIG. 13 is a waveform diagram showing a process of generating a shutter control signal for the CCD element according to the present invention. As shown in FIG. 13, the timing signal obtained from the tracking signal recording area 13 is delayed by a predetermined time obtained from the transport speed in the Y direction so that the exposure time of the CCD element coincides with the vicinity of the maximum value of the amount of diffracted light. Then, an electronic shutter control signal for opening and closing the electronic shutter is generated and sent to the CCD element, and the signal readout control is performed by using this signal instead of the vertical synchronizing signal. That is, the output signal of the timing signal generation circuit 34 shown in FIG.
Note that the delay pulse generation circuit 47 has a function of continuously transmitting a signal similar to the delay pulse generated so far for a predetermined time even if the output signal of the timing signal generation circuit 34 stops. Therefore, FIGS. 1 and 4
Even if the tracking signal recording area 13 exists only at a position distant from the information recording area 12 as in the first embodiment shown in FIG. The electronic shutter control signal at a proper timing can be continuously supplied.

Next, another embodiment of the optical recording medium of the present invention will be described with reference to FIGS. FIG. 14 is a schematic partial enlarged plan view of a second embodiment of the optical recording medium of the present invention. In this embodiment, two rows of CGH are used as the tracking signal recording area. That is, a row composed of an alternate array of CGHs 13A and 13B similar to the tracking signal recording area 13 in FIG. 4 and four different types of CGHs 13A, 1B described in FIG.
There is provided a row composed of an alternate arrangement of CGHs 13C and 13D in 3B, 13C and 13D. In addition, CGH13A
Is below CGH and CGH is below CGH13B.
13D comes. Also, the middle boundary line between the two columns is one of the plurality of columns of the information recording area 12.
It is arranged to be on the extension of the center line of the two columns.

In the embodiment shown in FIG. 4, two types of CGHs are arranged in the tracking signal recording area 13, so that the two light receiving elements 30A,
0B was used as shown in FIG. 22 and FIG.
In the second embodiment, since four different types of CGHs are arranged in the tracking signal recording area 13,
Four light receiving elements corresponding to each type of CGH are arranged (not shown). Therefore, when incident light is applied to each CGH, diffracted light having a diffraction angle corresponding to the type is obtained,
An image is formed on each corresponding light receiving element, and a signal is generated there.

FIG. 15 shows the tracking signal recording area 13 of FIG. 14 and the four light receiving elements 30A, 30B, 30C,
It is a timing chart which shows the time relationship with the waveform diagram of the output signal of 30D. FIG. 16 shows a waveform diagram of a signal obtained when a light beam relatively moves in the short direction of the tracking signal recording area 13.
3 is shown alongside the CGH in the short side direction. FIG.
As shown in FIG. 5, when light rays are incident on CGH C and CGH D, signals are generated in the light receiving elements 30C and 30D, and FIG.
A waveform similar to that described with reference to No. 1 is obtained. In the following description, each CGH A, CGH of FIG.
Diffracted light from B, CGH C, and CGH D (shown as A, B, C, and D in FIG. 15 for simplicity) in FIG.
Signals obtained by receiving light at A, 30B are A, B,
C and D will be represented. The light is CGHA, CGH C,
When the light is irradiated to the central portion straddling CGH B and CGH D, a signal of a lower level is generated in each light receiving element than when only a single light receiving element is irradiated. But A
Considering the + C signal and the B + D signal, the behavior is the same as that of the single-row tracking signal recording area 13 in FIG.

Further, the irradiation position of the light beam is shifted vertically,
The timing is not limited to the position over two rows, and the timing is such that only one of the upper row with CGHA and CGH B or the lower row with CGH C and CGH D is irradiated. It is the same, and it can be said that there is a margin in the vertical direction. Therefore, in the second embodiment shown in FIG. 15, the read timing is detected by calculating the difference between the upper and lower sum signals as follows.

[0046]

## EQU00005 ## Detection of read timing = (A + C)-(B + D)

The tracking signal area 13 in which the light beam has two rows
When moved in the vertical direction, the output signal of each light receiving element is
It changes as shown in FIG. That is, CGH A,
The diffracted lights from CGH B, CGH C, and CGH D are incident on light receiving elements 30A, 30B, 30C, and 30D, respectively, and corresponding signals are generated. As in the horizontal direction (X direction), when a light beam (light spot) advances from A to C and from B to D, a signal having a form shown in FIG. 16 is generated. A
And B have the same phase, and C and D have the same phase. Therefore, when the detection is performed in the up-down direction (Y direction), it is not affected by the change in the horizontal direction (X direction). That is, the position in the up-down direction (Y direction) is detected by taking the difference between the signals of the two right and left sums as shown in the following equation.

[0048]

[Formula 6] Y (vertical) direction position information = (A + B) − (C + D)

Therefore, when the light spot is evenly over the two upper and lower rows of tracking signal recording areas,
The value of (A + B)-(C + D) becomes 0. By controlling the relative position of the optical spot and the optical recording medium 10 in the Y direction so that this value approaches 0, the light beam is irradiated on the tracking signal recording area 13 of the optical recording medium 10 in an ideal state. It will be. The control of the relative position is as follows:
This can be realized by moving the optical recording medium 10 in the Y direction by a mechanism shown in FIG.

Next, a third embodiment of the optical recording medium of the present invention will be described with reference to FIG. In the third embodiment, the tracking signal recording area 13 is provided not only at a position distant from the information recording area 12, but also as one line in the information recording area 12 as an extension of the tracking signal recording area 13. The tracking signal recording area 13 in this embodiment has four types of CGHs arranged in two rows as in the second embodiment shown in FIG. The length Ly in the Y direction of each CGH of the tracking signal recording area 13 is equal to the information recording area 12.
ピ ッ チ of the pitch Py in the Y direction of the CGH, and one line in the information recording area 12 is
In the portion provided as an extension of No. 3, the boundary between different types of CGHs in the tracking signal recording area 13 is arranged in such a manner as to coincide with the center line in the Y direction of each row of the information recording area 12. With such an arrangement, the timing for reading information from the information recording area 12 can be generated based on the signal obtained from the tracking signal recording area 13, so that the information can be read reliably and efficiently with accurate timing.

FIG. 18 is a diagram showing a portion where one row in the information recording area 12 of FIG. 17 is provided as an extension of the tracking signal recording area 13 and its periphery. As shown, the length Lx in the X direction of each CGH of the tracking signal recording area 13 is equal to the length Cx of the information recording area 12.
It is set to １ ／ of the pitch Px of the GH in the X direction. FIG.
FIG. 9 is a view showing a fourth embodiment which is a modification of FIG. 18, in which a portion in which one row in the information recording area 12 is provided as an extension of the tracking signal recording area 13 and its periphery are shown. I have. The fourth embodiment differs from the third embodiment of FIGS. 17 and 18 only in the following points. That is, the X direction length Lx of each CGH of the tracking signal recording area 13 is equal to the X length of the CGH of the information recording area 12.
It is set to １ ／ of the pitch Px in the direction.

FIG. 20 is a view showing a fifth embodiment of the optical recording medium of the present invention. In the fifth embodiment, the size in the X direction of a part of the tracking signal recording area 13 in the fourth embodiment shown in FIG. It increases as you move away. Specifically, in the fifth embodiment, the tracking signal recording area 13 includes four parts 13-1, 13-2, 13-3, and 13-4. The tracking signal recording area 13-1 is the same as the tracking signal recording area 13 in the fourth embodiment of FIG. 19, and includes 13-2, 13-3, and 13-.
The size in the X direction increases as the numerical value of the subscript 4 increases. With this arrangement, the tracking signal recording area 13 located farthest from the information recording area 12 on the optical recording medium 10 has the largest size in the X direction. After loading, the tracking signal recording area 13
When a light beam is applied to the optical recording medium 10 to obtain a tracking signal, the optical recording medium 10 is moved in the Y direction ( The control is performed so that the deviation in the X-direction position converges as the paper is transported in the transport direction). That is, it is possible to reduce the influence of the mechanical error of the transport mechanism in the optical recording medium information reading device when the optical recording medium 10 is introduced. Further, by narrowing the dimension of the tracking signal recording area 13 in the X direction in accordance with the conveyance, the influence of the adjacent light beam can be reduced.

In each of the above embodiments, the size of each CGH can be arbitrarily set as long as the condition for appropriately irradiating the light beam is satisfied. For example, the information recording area 12 in each of the embodiments shown in FIG. CGH is 100μ
The pitch can be set to m square, and the pitch (row pitch) Py in the Y direction in FIG. 17 and the pitch (column pitch) Px in the X direction in FIG. 18 can be 200 μm.

As is clear from the above description, as shown in FIGS. 2, 3 and 23, the monochromatic light (light of a predetermined wavelength) from the light source 16 is split into a plurality of light beams by the beam splitter 26.
A plurality of luminous fluxes obtained as a result are arranged in a plurality of CGs in one row of the information recording area 12 of the optical recording medium 10 arranged in the X direction.
Irradiate H. At this time, the light flux at the center is the 0th-order diffracted light, and ± nth-order diffracted lights on both sides thereof are n = 1 and n =
2, n = 3... FIG. 21A shows this state. When the information recording area 12 of the optical recording medium has, for example, three rows, up to n = 1 is used, and when it is five rows, up to n = 2 is used. When there are seven columns, n =
Use 3. FIG. 21B shows the beam splitter 26.
In the spectral state. In FIG. 21B, the horizontal axis corresponds to the X direction of the optical recording medium 10, and the vertical axis indicates the irradiation intensity on the optical recording medium 10. From this graph,
The zero-order light at the center has a higher light intensity than other information reading light,
Further, it can be seen that the intensities of the information reading light beams are almost the same.

FIG. 23 is a perspective view of a preferred embodiment of the information reading apparatus for an optical recording medium according to the present invention, as viewed from below the optical recording medium 10. The light beam emitted from the light source 16 is divided into a plurality of light beams by the diffraction grating 26 as a beam splitter, and then the light beam forming plate 70 having a pinhole is provided.
A passes through a pinhole and enters an information recording area 12 provided on the optical recording medium 10. It is assumed that the optical recording medium 10 has a plurality of rows of information recording areas 12 and a tracking signal recording area 13. Light diffracted by the tracking signal recording area 13 is transmitted to photodiodes 30A and 30B as light receiving elements.
The light detected at and diffracted by the information recording area 12 is
The light is projected on the light receiving surface of the image sensor 20 as a plurality of light rays having a two-dimensional spread and received. The light from the tracking signal recording area 13 is used to generate the electronic shutter control signal of the image sensor 20 and to record the optical recording medium 1 as described above.
It can be used to control the transport speed of 0. The output signal of the image sensor (CCD) 20 is supplied to the video information processing circuit 38 shown in FIG. 22, and decodes information in each light receiving portion to read recorded information.

FIG. 24A is a plan view showing the structure of the light beam shaping plate 70A. The light beam shaping plate 70A has a pinhole 72 as a circular through hole. FIG. 24B is a plan view showing the structure of another light beam forming plate 70B, in which a pin hole 74 as an elliptical through hole is provided in the light beam forming plate 70B. This pinhole 72, 7
Depending on the shape of the light beam 4, the light beam can be formed into a conical shape, a long conical shape, or arbitrarily set.

FIGS. 25 and 26 show the transfer device 4 in FIG.
It is a perspective view which shows the specific structure of FIG. The transport device 48 has a substrate unit 80 on which the optical recording medium 10 is placed.
Is attached to a stationary portion (not shown) by two shafts 82 and 84 so as to be movable in the X direction in the figure (the short direction of the optical recording medium 10). The shaft 86 is rotationally driven by a motor (not shown) driven by receiving an output signal of the transport speed control circuit 46 in FIG. 22, and the coaxial roller 88 is rotated by friction with the surface of the optical recording medium 10. ,
The optical recording medium 10 is driven in the Y direction (longitudinal direction). FIG. 26 shows how the optical recording medium 10 is driven in the X direction. At the end of the substrate portion 80, there are provided teeth 94 that mesh with the gear teeth, and the rotational force of the motor 90 is transmitted to the teeth 94 via the gear assembly 92, so that the substrate portion 80 is driven in the X direction. The light receiving elements 30A and 30B shown in FIG. 22 detect the diffracted light from the tracking signal recording area 13 and process the output signal as described above, thereby obtaining the motor 9
With a configuration in which 0 is feedback-controlled, a deviation in the vertical direction (X direction) of the optical recording medium 10 can be corrected. Therefore, it is possible to eliminate influences such as a mechanical variation of the information recording area 12 and a vertical shift. In addition,
The mechanical variation of the information recording area 12 is caused by the heat shrinkage after molding the card and the distortion is uniformly generated in the entire card. Therefore, when the tracking signal recording area 13 is located at a position away from the information recording area 12, Also,
A mechanical error between the two recording areas 12 and 13 does not matter. Therefore, the transport speed of the card 10 can be controlled by the signal generated by the tracking signal recording area 13.

In the above-described embodiment, the information reading apparatus for an optical recording medium for reading recording data from an optical recording medium has been described. However, when the optical recording medium is a prepaid card or the like, an already recorded area is read in accordance with the usage amount. CG as
In some cases, data is erased by destroying the H portion by applying heat or impact, and erasing such data is equivalent to writing new data in a sense. In this case as well, accurate and high-speed timing control and medium transport control according to the present invention are desired. However, the above embodiments can be applied to a reader / writer having such a data writing function.

Although not described in the claims, the following configuration is a preferred embodiment of the present invention. (1) A plurality of hologram patterns for providing a tracking signal are continuously arranged from a position away from the information recording area in a predetermined direction to the inside of the information recording area. (2) Two different types of hologram patterns are arranged so as to be adjacent to each other at the center line of the row in the X direction of the hologram pattern in the information recording area. (3) There are four types of hologram patterns that provide tracking signals with different diffraction directions, two different hologram patterns are arranged in the X direction, and two different hologram patterns are alternately arranged in the Y direction.
Two rows are provided in the Y direction. (4) When the length of a hologram pattern provided in the information recording area and providing a tracking signal in a direction orthogonal to the predetermined direction is Lx, the tracking signal existing in a position away from the information recording area in the predetermined direction is determined as Lx. The length of the given hologram pattern in the direction orthogonal to the predetermined direction is a value larger than Lx. (5) The length of the hologram pattern, which is located at a position separated from the information recording area in the predetermined direction and provides a tracking signal, in the direction perpendicular to the predetermined direction is gradually reduced from the end of the optical recording medium toward the information recording area. That (6) The hologram pattern for providing the tracking signal is CGH. (7) The control means has a light quantity change detecting means for detecting a change in the amount of light received by the second diffracted light receiving means. (8) The light amount change detecting means detects a boundary between portions of the plurality of hologram patterns that provide a tracking signal and have different diffraction directions.

[0060]

As described above, according to the present invention, apart from a plurality of hologram patterns (information recording areas) in which original data (main signals) are recorded on an optical recording medium, a tracking signal (sub signal) is provided. A plurality of tracking signal recording medium areas are arranged as a hologram pattern that gives the following, and the light beams diffracted here are received by the light receiving elements 30A and 30B to generate a tracking signal. Using this, a main signal reading timing and / or Alternatively, since the position of the optical recording medium in the Y direction and / or the X direction is controlled, data can be read out from the optical recording medium in which a plurality of hologram patterns are two-dimensionally arranged at high speed and efficiently. And can be erased.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a first embodiment of an optical recording medium according to the present invention.

FIG. 2 shows a plurality of rows of hologram patterns in one irradiation.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating a configuration of an embodiment of an optical recording medium information reading device of the present invention that can be read simultaneously.

FIG. 3 shows information on a reflection-type optical recording medium that irradiates light obliquely to the hologram pattern and detects reflected light when the optical recording medium of the present invention has a hologram pattern provided with a reflective film. FIG. 2 is a schematic diagram illustrating a configuration of a reading device.

FIG. 4 is an enlarged plan view schematically showing a main part of the optical recording medium according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram showing four types of CGH used in the second and subsequent embodiments including two types of CGH used in the first embodiment of the optical recording medium of the present invention.

FIG. 6 is a block diagram schematically illustrating a method of manufacturing an optical recording medium master, a method of recording information on an optical recording medium, an apparatus and a method of manufacturing an optical recording medium.

7A is a view showing a procedure for obtaining a hologram interference fringe pattern from a two-dimensional image, and FIG. 7B is a photograph showing an example of a hologram interference fringe used in the present invention.

FIG. 8 is a perspective view showing a diffraction state of a light beam incident on one CGH in a tracking signal recording area of the optical recording medium of the present invention.

FIG. 9 is a perspective view of a part of FIG. 8 which is enlarged and slightly rotated.

FIG. 10 is a front view showing an arrangement relationship of light receiving elements for receiving the diffracted light from the information recording area and the diffracted light from the tracking signal recording area in the information reading device for an optical recording medium of the present invention.

FIG. 11 is a waveform diagram for explaining a process of generating a read timing from a tracking signal recording area according to the first embodiment of the optical recording medium of the present invention.

FIG. 12 is a timing chart of a drive signal when a CCD element as an image sensor is driven by a conventional method.

FIG. 13 is a waveform chart showing a process of generating a shutter control signal of the CCD element according to the present invention.

FIG. 14 is an enlarged plan view schematically showing a main part of an optical recording medium according to a second embodiment of the present invention.

FIG. 15 is a waveform diagram and the like for explaining a process of generating a read timing from a tracking signal recording area according to the second embodiment of the optical recording medium of the present invention.

FIG. 16 is a waveform diagram and the like for explaining a method for obtaining position information in the Y direction from a tracking signal recording area according to the second embodiment of the optical recording medium of the present invention.

FIG. 17 is an enlarged plan view schematically showing a main part of an optical recording medium according to a third embodiment of the present invention.

FIG. 18 is an enlarged plan view schematically showing a main part of an optical recording medium according to a third embodiment of the present invention.

FIG. 19 is an enlarged plan view schematically showing a main part of an optical recording medium according to a fourth embodiment of the present invention.

FIG. 20 is an enlarged plan view schematically showing a main part of an optical recording medium according to a fifth embodiment of the present invention.

FIGS. 21A and 21B are a schematic diagram illustrating a state of spectral separation by a beam splitter in an information reading apparatus for an optical recording medium according to the present invention, and a graph illustrating a light intensity distribution on a light receiving surface of the obtained spectral separation.

FIG. 22 is a diagram schematically showing an overall configuration of an embodiment of an information reading apparatus for an optical recording medium according to the present invention and an electric circuit portion thereof.

FIG. 23 is a perspective view of a preferred embodiment of an information reading apparatus for an optical recording medium according to the present invention as viewed from below the optical recording medium.

FIG. 24 is a plan view showing two examples of a light beam forming plate provided with a pinhole used to obtain a light beam having a desired shape.

FIG. 25 is a perspective view showing a state in which the optical card is driven in the longitudinal direction by a device for driving the optical card in the longitudinal direction (X direction) and in the lateral direction (Y direction).

FIG. 26 is a perspective view showing a state in which the optical card is driven in the lateral direction by a device for driving the optical card in the longitudinal direction (X direction) and the lateral direction (Y direction). .

[Description of Signs] 10, 10A Optical recording medium (card) 12 Information recording area (diffraction grating / hologram pattern / CGH) 13 Tracking signal recording area (diffraction grating / hologram pattern / CGH) 16 Light source 20 Image sensor (CCD element) (First diffracted light receiving means) 22 Information reading device for optical recording medium 26 Diffraction grating as beam splitter (constituting means for irradiating light beam with light source) 30A, 30B Light receiving element (photodiode: PD)
(Second diffracted light receiving means) 33A, 33B amplifier 34 Timing signal generation circuit (constituting light amount change detection means together with difference operation circuit and sum operation circuit) 35 difference operation circuit 37 sum operation circuit 36 CCD element controller (control means) Reference Signs List 38 Image information processing circuit (reading means) 46 Transfer speed control circuit (control means) 47 Delay pulse generation circuit 48 Transfer device (conveying means) 80 Substrate section 82, 84, 86 Shaft 88 Roller 90 Motor 92 Gear assembly 94 Tooth

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G06K 19/06 G11B 7/24 561B G11B 7/24 561 G06K 19/00 D (72) Inventor Kazunori Namiki Kanagawa 3-12-12 Moriyacho, Kanagawa-ku, Yokohama City, Japan (72) The inventor Kenji Narusawa 3-12-12 Moriyacho, Kanagawa-ku, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture, Japan (72) Inventor Atsushi Wakatsuki (72) Inventor Tomoyuki Hoshikawa 3-3-3 Toyosu, Koto-ku, Tokyo NTT DATA COMMUNICATION CO., LTD. (72) Inventor: Naoyuki Ichihara, NTT Data Communication Co., Ltd., 3-3-3 Toyosu, Koto-ku, Tokyo

Claims (12)

[Claims] 1. A plurality of hologram patterns are arranged in a predetermined direction as information recording areas, and when loaded into a predetermined optical recording medium information reading device, are conveyed at least in the predetermined direction and record information is read. In the optical recording medium configured as described above, a plurality of hologram patterns for providing a tracking signal are arranged separately from the plurality of hologram patterns. 2. The optical recording medium according to claim 1, wherein a plurality of hologram patterns for providing the tracking signal are arranged at positions separated from the information recording area in the predetermined direction. 3. When the plurality of hologram patterns for providing the tracking signal are loaded in the optical recording medium information reading device, the plurality of hologram patterns are located in front of the information recording area in the traveling direction of the optical recording medium. The optical recording medium according to claim 1, wherein the optical recording medium is arranged. 4. A plurality of hologram patterns are two-dimensionally arranged as information recording areas in a Y direction and an X direction, and are conveyed at least in the Y direction when loaded into a predetermined optical recording medium information reading device. In the optical recording medium configured to read out the recorded information, one row of the plurality of hologram patterns in the Y direction is a row of a plurality of hologram patterns that provide a tracking signal instead of the information of the plurality of hologram patterns. An optical recording medium, comprising: 5. A plurality of hologram patterns constituting a row of a plurality of hologram patterns for providing the tracking signal are continuously arranged in the Y direction, and two different hologram patterns are alternately arranged in the Y direction. The optical recording medium according to claim 4, wherein the two types of hologram patterns are arranged adjacent to each other at a center line of a row of the hologram patterns in the X direction in the information recording area. 6. A plurality of hologram patterns for providing the tracking signal have four types of hologram patterns having different diffraction directions, two different hologram patterns are arranged in the X direction, and two different hologram patterns are different from each other. 2. The optical recording medium according to claim 1, wherein two rows are provided in the Y direction so as to be alternately arranged in the Y direction. 7. A plurality of hologram patterns are arranged as information recording areas at a predetermined row pitch in the Y direction and at a predetermined column pitch in the X direction, and when loaded into a predetermined optical recording medium information reader, In the optical recording medium configured to be conveyed in the Y direction and read the recording information, separately from the plurality of hologram patterns,
An optical recording medium, wherein the length in the Y direction is の of the row pitch, and two types of hologram patterns for providing a tracking signal are alternately and continuously arranged in the Y direction. 8. A plurality of hologram patterns are arranged as information recording areas at a predetermined row pitch in the Y direction and at a predetermined column pitch in the X direction, and when loaded into a predetermined optical recording medium information reader, In the optical recording medium configured to be conveyed in the Y direction and read the recording information, separately from the plurality of hologram patterns,
An optical recording medium, wherein the length in the X direction is 1/2 of the column pitch, and a plurality of hologram patterns for providing a tracking signal are continuously arranged in the Y direction. 9. A plurality of hologram patterns are arranged as information recording areas at a predetermined row pitch in the Y direction and at a predetermined column pitch in the X direction, and when loaded in a predetermined optical recording medium information reading device, In the optical recording medium configured to be conveyed in the Y direction and read the recording information, separately from the plurality of hologram patterns,
An optical recording medium, wherein the length in the X direction is 1/4 of the column pitch, and a plurality of hologram patterns for providing a tracking signal are continuously arranged in the Y direction. 10. An optical recording medium in which a plurality of hologram patterns are arranged in a predetermined direction as an information recording area and a plurality of hologram patterns for providing a tracking signal are arranged separately from the plurality of hologram patterns. Means for irradiating a predetermined light beam to the hologram pattern of the information recording information recording area and the hologram pattern for providing the tracking signal, and diffracting the hologram pattern of the information recording area. First diffracted light receiving means having a plurality of light receiving elements arranged two-dimensionally so as to be able to receive the diffracted light in the predetermined direction; and decoding the information detected by the diffracted light receiving means. Means for reading recorded information of a plurality of holograms, Second diffracted light receiving means capable of receiving a plurality of diffracted lights in different directions diffracted by the laser beam, a conveying means for conveying the optical recording medium in a predetermined direction, and a second diffracted light receiving means. The first signal in response to an output signal;
An information reading device for an optical recording medium, comprising: control means for controlling read timing in the diffracted light receiving means. 11. An optical recording medium in which a plurality of hologram patterns are arranged in a predetermined direction as information recording areas, and a plurality of hologram patterns for providing a tracking signal are arranged separately from the plurality of hologram patterns. Means for irradiating a predetermined light beam to the hologram pattern of the information recording area and the hologram pattern for providing the tracking signal, wherein the information is diffracted by the hologram pattern of the information recording area. First diffracted light receiving means having a plurality of light receiving elements arranged two-dimensionally so as to be able to receive diffracted light in a predetermined direction; and recording of the diffraction grating by decoding information detected by the diffracted light receiving means. Means for reading information; and a plurality of hologram patterns for providing the tracking signal. Second diffracted light receiving means capable of receiving a plurality of diffracted diffracted lights in different predetermined directions, conveying means for conveying the optical recording medium in a predetermined direction, responsive to an output signal of the second diffracted light receiving means A control unit for controlling the transport speed of the optical recording medium by the transport unit. 12. An optical recording medium in which a plurality of hologram patterns are arranged in a predetermined direction as an information recording area, and a plurality of hologram patterns for providing a tracking signal are arranged separately from the plurality of hologram patterns. Means for irradiating a predetermined light beam to the hologram pattern of the information recording area and the hologram pattern for providing the tracking signal, wherein the information is diffracted by the hologram pattern of the information recording area. First diffracted light receiving means having a plurality of light receiving elements arranged two-dimensionally so as to be able to receive diffracted light in a predetermined direction; and recording of the diffraction grating by decoding information detected by the diffracted light receiving means. Means for reading information; and a plurality of hologram patterns for providing the tracking signal. Second diffracted light receiving means capable of receiving a plurality of diffracted diffracted lights in different predetermined directions, conveying means for conveying the optical recording medium in the Y direction and X direction, and output of the second diffracted light receiving means Control means for controlling the position of the optical recording medium in the X direction by the transport means in response to a signal.