JP2001228783A - Optical recording medium recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording medium recording and reproducing device which can read out a hologram image of a residual part with excellent precision by using an optical recording medium on which hologram image is previously recorded and destroying a desired part of the image so as to be unable to record again and then cutting unnecessary reflected light from the destroyed part to make only diffracted light from a residual part receivable when image parts except this part are read out. SOLUTION: An optical card D has a protective film D4 laminated on an area D2 where hologram is recorded on a light-transmissive substrate D1. A device C, which destroys a part or whole of the area D2 of the optical card D, records information in the area D2 and reproduces the area D2, is provided with an image pickup element 11A2 and an impact head 12AA. Further an angle θ of a tapered surface 12A1a of an top end 12A1 of a pin 12A of a head 12AA is set within a desired angle range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to counterfeiting of prepaid cards, credit cards, cash cards and the like.
The present invention relates to an optical recording medium recording / reproducing apparatus suitable for an optical recording medium particularly requiring a function of preventing tampering.

[0002]

2. Description of the Related Art At present, recording media such as prepaid cards, credit cards, and cash cards have a magnetic recording portion called a magnetic stripe, on which a balance and an ID number for confirming the identity as required are recorded. In the case of the prepaid card, the record such as the balance is sequentially changed as the card is used. Such a card as a recording medium is convenient for carrying and contributes to a so-called cashless society without cumbersome cash transfer. For recording and reproducing information on the magnetic recording portion of such a card,
This is performed by moving a magnetic head in contact with a magnetic recording portion like a so-called magnetic tape recorder.

[0003] However, since the magnetic recording portion of such a card is a magnetic recording layer, it is possible to easily judge the recorded content, and therefore it is easy to forge, and a large number of telephone cards and prepaid cards are used. It is often forged and is becoming a social issue. In order to cope with such forgery, complicated magnetic recording systems and IC cards have been proposed in place of the conventional simple magnetic recording system, but they have a problem of high cost and have not been widely used.

On the other hand, there has been proposed an optical recording medium recording / reproducing apparatus using a diffraction grating or hologram as optical recording instead of the magnetic recording method described above (for example, Japanese Patent Application Laid-Open No. 10-1998).
198259). This optical recording medium recording / reproducing apparatus uses a method in which a thermal head is pressed against a medium recording surface as a means for recording information and a method in which a recording layer is destroyed by ripening, and a method in which a recording layer is destroyed by hitting an impact pin. However, they all had problems to be solved.

[0005]

FIG. 12 is a diagram for explaining a schematic configuration of a conventional optical recording medium recording / reproducing apparatus.
3 and FIG. 14 are a plan view and a side sectional view of the optical recording medium, respectively, and FIG. 15 is a diagram for explaining the operation of the optical recording medium recording and reproducing apparatus shown in FIG.

A conventional optical recording medium recording / reproducing apparatus A is shown in FIG.
As shown in FIG. 2, the apparatus includes a main body 1, a transport belt 2, a photodetector 3, a recording unit 4 that is a thermal head or an impact head, a CCD camera 5, a semiconductor laser 6, and a half mirror 7. As will be described later, when recording and reproducing information from the optical card B, it is performed using an optical system including a CCD camera 5, a semiconductor laser 6, and a half mirror 7, and when recording information to the optical card B, A recording unit 4 is used in addition to this optical system.

As shown in FIGS. 13 and 14, an optical card B used in this optical recording medium recording / reproducing apparatus A has a substrate B
1 on the recording area B2 formed on the
3. A UV protection film B4 is sequentially laminated. Information is optically recorded in the recording area B2 using a diffraction grating or a hologram.

When recording and reproducing information from the optical card B using the optical recording medium recording and reproducing apparatus A, first, the optical card B is inserted from the insertion portion 1a at the left end in FIG. The inserted optical card B is moved from the left side to the right side (transfer direction MI) of the apparatus by the motor-driven conveyance belt 2 and roller bearings (not shown), and the CCD camera 5
Transported to just below. This position is called a recording / reproducing position. At this recording / reproducing position, recording / reproducing of the recording area B2 of the optical card B is performed.

The recording / reproducing position is located immediately below the CCD camera 5 as shown in FIG. 15, and the laser beam L emitted from the semiconductor laser 6 is reflected by the half mirror 7 to form the recording area B2 of the optical card B. Irradiated from above,
Further, this is a position where the reflected light reflected on the recording area B2 can enter the objective lens of the CCD camera 5 after passing through the half mirror 7. In other words, this recording / reproducing position is such that the optical axis of the laser beam L emitted from the semiconductor laser 6 via the half mirror 7 is orthogonal to the optical axis of the CCD camera 5 and One optical axis is the surface of the recording area B2 of the optical card B (the upper surface of the substrate B1)
This is a position where the optical system including the CCD camera 5, the semiconductor laser 6, and the half mirror 7 is fixedly arranged so as to be perpendicular to.

The reproduction of information from the optical card B is performed as follows. That is, the diffracted light after irradiating the laser beam L via the half mirror 7 onto the recording area B2 of the optical card B placed at the recording / reproducing position is transmitted to the CCD camera 5 side via the half mirror 7. Emit. The image based on the diffracted light received by the CCD camera 5 is compared with a reference image recorded in advance in the apparatus to perform information recognition.
Thus, the reproduction of the recording area B2 of the optical card B is performed.

On the other hand, recording of information on the optical card B is performed as follows. That is, when the recording unit 4 is a thermal head, heating is performed on the recording area B2 of the optical card B placed at the recording / reproducing position, and when the recording unit 4 is an impact head, impact is applied. Driving with a pin is performed. Thus, the recording in the recording area B2 is performed by irreversibly destroying the recording area B2 of the optical card B so as not to generate the diffracted light. Here, recording means changing the recording area to a state where no diffracted light is generated.

Optical recording medium recording / reproducing apparatus A having the above configuration
Had the following main problems. When the recording section 4 is a thermal head, the recording area B2 of the optical card B is generated by the heat generated by the thermal head.
In this method, the thermal head is moved from the UV protection film B4 side to the recording area B2.
It needs to be adhered on top. However, if foreign matter or the like adheres to the recording area B2 (on the UV protection film B4), the amount of heat transmitted from the thermal head to the recording area B2 changes (decreases) due to the degree of close contact between the thermal head and the recording area B1. ), And the range in which the recording area B2 can be destroyed (recorded) greatly varies. In the case where the recording unit 4 is an impact head, a method is employed in which the impact pin of the impact head is driven from the UV protective film B4 side to mechanically destroy the recording area B2. As a result of crushing the interference fringes of the hologram, which is the recording area B2, due to the impact of the impact pin, unnecessary reflected light is generated in an unintended direction from a destruction portion of the interference fringes,
When this jumps into the CCD camera 5, it prevents reading of information from the diffracted light.

[0013]

In order to solve the above-mentioned problems, the present invention provides an optical recording medium recording / reproducing apparatus having the following constitutions (1) to (3). (1) A recording area formed on one surface of a translucent substrate and formed by duplicating a drawing of interference fringes of a hologram corresponding to a required two-dimensional image, and laminated on the recording area. An optical recording medium recording / reproducing apparatus which records information in the recording area by destroying a part or all of the recording area of an optical recording medium having a light-transmitting protective film, and reproduces the recording area. A laser beam obliquely incident on the other surface of the light-transmitting substrate at a predetermined incident angle is transmitted through the light-transmitting substrate and is irradiated on the recording area, and the irradiation causes the laser light to be irradiated on the recording area. Diffracted light detecting means for detecting, through the light-transmitting protective film, diffracted light due to the interference fringes of the hologram generated in step (a), and tapering a part or all of the recording area from the light-transmitting protective film side to the tip thereof. I crush on the surface Recording means having impact pins, irradiating the laser light transmitted through the light-transmitting substrate onto the undestructed recording area, and from the recording area through the light-transmitting protective film through the laser light. When the zero-order light and the plurality of diffracted lights that are transmitted lights of the first and second diffracted lights are emitted, first diffracted light that irradiates the vicinity of the center of the light receiving surface of the diffracted light detection means among the plurality of diffracted lights; The angle formed by the zero-order light is θ1, from the irradiation point on the recording area irradiated with the laser light to the outermost end farthest from the zero-order light on the light receiving surface of the diffracted light detecting means. Is the angle between the optical path of the first diffracted light and the first diffracted light, the angle θ of the tapered surface at the tip of the impact pin is θ <π−2 (θ1 + θ2) where θ1 + θ2 <π / 2. Recording / reproducing apparatus for an optical recording medium. (2) A recording area formed on one surface of the light-transmitting substrate and obtained by duplicating a drawing of interference fringes of a hologram corresponding to a required two-dimensional image, and laminated on the recording area. Information is recorded in the recording area of the optical recording medium having a reflective film and a protective film laminated on the reflective film by destroying a part or all of the recording area, and the recording area is reproduced. An optical recording medium recording / reproducing apparatus, wherein a laser beam obliquely incident on the other surface of the translucent substrate at a predetermined incident angle is transmitted through the translucent substrate and irradiated onto the recording area. And a diffracted light detecting means for detecting the diffracted light due to the interference fringes of the hologram generated on the recording area by the irradiation with the reflective film and then detecting the reflected light through the translucent substrate, and from the protective film side,
Recording means having an impact pin for crushing a part or all of the recording area with a tapered surface at the tip thereof,
The non-destructive recording area is irradiated with the laser light transmitted through the light-transmitting substrate, and a plurality of 0-order light, which is reflected light of the laser light from the reflective film via the light-transmitting substrate, is formed. When the first diffracted light of the plurality of diffracted lights is emitted near the center of the light receiving surface of the diffracted light detecting means and the zero-order light, an angle θ1 is formed. An optical path from an irradiation point on the recording area irradiated with the laser light to an outermost end farthest from the zero-order light on a light receiving surface of the diffracted light detecting means; The angle θ of the tapered surface at the tip of the impact pin is θ <π− (θ1 + θ2), where θ1 + θ2 <π. . (3) A film sheet having one surface on which a reflective film is laminated on a recording area formed by transferring the same non-inverted image as an image in which interference fringes of a hologram corresponding to a required two-dimensional image is drawn is attached to an adhesive layer. An optical recording medium recording / reproducing apparatus which records information in the recording area by destroying a part or all of the recording area of an optical recording medium adhered on a substrate via a recording medium and reproduces the recording area The laser light obliquely incident on the other surface of the film sheet at a predetermined incident angle is transmitted through the film sheet and is irradiated on the recording area, and the irradiation causes the laser light to be irradiated on the recording area. Diffraction light detecting means for detecting the diffracted light due to the interference fringes of the generated hologram by the reflection film and then detecting the reflected light through the film sheet, and from the other surface side of the film sheet, Recording means having impact pins for crushing a part or all of the recording area at the tapered surface at the tip thereof, irradiating the laser light transmitted through the film sheet onto the undestructed recording area, When the zero-order light and the plurality of diffracted lights, which are the reflected light of the laser light, are emitted from the reflective film through the film sheet, of the plurality of diffracted lights, The angle formed by the first diffracted light irradiating the vicinity of the center and the 0th-order light is θ1, on the light receiving surface of the diffracted light detecting means from the irradiation point on the recording area irradiated with the laser light, An optical path from the zero-order light to the farthest outermost end,
Assuming that the angle formed by the first diffracted light is θ2, the angle θ of the tapered surface at the tip of the impact pin is θ <π− (θ1 + θ2), where θ1 + θ2 <π. Optical recording medium recording / reproducing device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical recording medium recording and reproducing apparatus according to the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are diagrams for explaining states before and after recording using a transmission type optical recording medium recording / reproducing apparatus which is a first embodiment of the optical recording medium recording / reproducing apparatus of the present invention, respectively. And FIG. 4 are views for explaining states before and after recording using a reflection type optical recording medium recording / reproducing apparatus which is a second embodiment of the optical recording medium recording / reproducing apparatus of the present invention. 6 is a diagram for explaining a state before and after recording using a film reflection type optical recording medium recording / reproducing apparatus as a third embodiment of the optical recording medium recording / reproducing apparatus of the present invention, and FIG. FIG. 8 is a diagram for explaining the structure of an optical recording medium used in the apparatus, FIG. 8 is a schematic configuration diagram of an optical recording medium recording / reproducing apparatus of the present invention, and FIG. 9 describes the recording operation of the optical recording medium recording / reproducing apparatus of the present invention. FIG. 10 is a flowchart showing a second embodiment of the present invention. Diagram for explaining the main part of the mold optical recording medium recording and reproducing apparatus, FIG. 11 is a diagram for explaining the internal arrangement of the reflection type optical recording medium recording and reproducing apparatus shown in FIG.

As will be described later, the optical recording medium recording / reproducing apparatus of the present invention has a transmission type (first embodiment) and a reflection type (second embodiment).
Example) and a film reflection type (third example). Further, a transmission type optical recording medium D is used for the transmission type device, a reflection type optical recording medium DD is used for the reflection type device, and a film reflection type optical recording medium DDD is used for the film reflection type device.

First, a transmission type optical recording medium recording / reproducing apparatus according to a first embodiment of the present invention has the following configuration. That is,
As shown in FIGS. 1 and 2, one surface D of the translucent substrate D1
A recording area (denoted as a hologram) D2 formed by duplicating a hologram interference fringe pattern formed on 1a and corresponding to a required two-dimensional image;
A translucent protective film (UV (ultraviolet) protective film,
Optical recording medium (optical card) having protective film D4)
An optical recording medium recording / reproducing apparatus C for recording information in the recording area D2 by (mechanically) destroying part or all of the recording area D2 of D, and reproducing the recording area D2, The other surface D of the translucent substrate D1
Laser light (referred to as incident light) L obliquely incident on the recording area 1b at a predetermined incident angle θ0 is transmitted through the translucent substrate D1 and is irradiated onto the recording area D2, and the recording area D2 is irradiated by the irradiation. The diffracted light detecting means (imaging element) 11A2 for detecting, via the translucent protective film D4, the diffracted light 11 due to the interference fringes of the hologram generated on D2, and the recording area from the translucent protective film D4 side. A recording means (impact head) 12AA having an impact pin 12A for crushing a part or all of D2 by a tapered surface 12A1a of the tip 12A1 thereof, and the laser beam L transmitted through the translucent substrate D1 is not destroyed. The zero-order light 10 which is the transmitted light of the laser light L is irradiated onto the recording area D2 from the recording area D2 via the transparent protective film D4.
And when a plurality of diffracted lights 11 and 12 are emitted, the diffracted light detecting means 11 of the plurality of diffracted lights 11 and 12
Central part 11A21 of light receiving surface (imaging surface) 11A21 of A2
a first diffracted light 11 that irradiates the vicinity of a, and the zero-order light 10
The angle between the first and second diffraction light detecting means 11 from the irradiation point i on the recording area D2 irradiated with the laser light L
On the light receiving surface 11A21 of A2, when the angle between the optical path 11 from the zero-order light 10 to the outermost end 11A21c and the first diffracted light 11 is θ2, the angle of the impact pin 12A is Tapered surface 12A1 of tip 12A1
The angle θ of a is an optical recording medium recording / reproducing apparatus characterized in that θ <π−2 (θ1 + θ2), where θ1 + θ2 <π / 2.

Next, a reflection type optical recording medium recording / reproducing apparatus according to a second embodiment of the present invention has the following configuration. The same components as those described above are denoted by the same reference numerals. That is, FIG.
As shown in FIG. 4, a recording area (noted as hologram) formed on one surface D1a of the translucent substrate D1 and replicating a hologram interference fringe corresponding to a required two-dimensional image is drawn. ) An optical recording medium (optical card) having D2, a reflective film (aluminum reflective film) D3 laminated on the recording area D2, and a protective film (UV protective film) D4 laminated on the reflective film D3. DD, the recording area D2
An optical recording medium recording / reproducing apparatus C for recording information in said recording area D2 by destroying a part or all of said substrate and reproducing said recording area D2, wherein said translucent substrate D1
The laser light (referred to as incident light) L obliquely incident on the other surface D1b at a predetermined incident angle θ0 is applied to the transparent substrate D.
1 and irradiates the recording area D2 onto the recording area D2, and reflects the diffracted light 11 due to the interference fringes of the hologram generated on the recording area D2 by the irradiation on the reflection film D3 before the light transmitting substrate D1 And a part or all of the recording area D2 from the side of the protective film D4.
Recording means (impact head) 12AA having impact pins 12A that are crushed by the tapered surface 12A1a of A1
And irradiating the laser beam L transmitted through the translucent substrate D1 onto the undestructed recording area D2, and from above the reflective film D3 via the translucent substrate D1. 0-order light l0 and a plurality of diffracted lights l1, l
2 is emitted, the light receiving surface (imaging surface) of the diffracted light detecting means 11A2 among the plurality of diffracted lights 11 and 12
The angle formed by the first diffracted light 11 illuminating the vicinity of the central portion 11A21a of the 11A21 and the zero-order light 10 is θ1, and the diffracted light from the irradiation point i on the recording area D2 irradiated with the laser light L Light receiving surface 11A21 of detecting means 11A2
Above, the outermost end 11A2 farthest from the zero-order light 10
Assuming that the angle between the optical path 11 to 1c and the first diffracted light 11 is θ2, the tip 1 of the impact pin 12A
The angle θ of the tapered surface 12A1a of 2A1 is θ <π− (θ1 + θ2), where θ1 + θ2 <π.

Next, a recording / reproducing apparatus for a film reflection type optical recording medium according to a third embodiment of the present invention has the following configuration. The same components as those described above are denoted by the same reference numerals. That is, as shown in FIGS. 5 and 6, a recording area (noted as a hologram) D formed by transferring the same non-inverted image as an image in which a hologram interference pattern corresponding to a required two-dimensional image is drawn.
A film sheet (referred to as a film layer) D5 having one surface D5a on which a reflective film D3 is laminated on the adhesive layer D6
Information is recorded in the recording area D2 by destroying a part or all of the recording area D2 of the optical recording medium (optical card) DDD stuck on the substrate D1 through the An optical recording medium recording / reproducing apparatus C for reproducing, wherein the other surface D5b of the film sheet D5 is provided.
A laser beam (referred to as incident light) L obliquely incident at a predetermined incident angle θ0 is transmitted through the film sheet D5 and is irradiated onto the recording area D2. Diffraction light detection means (imaging element) 11A2 for detecting, via the film sheet D5, the diffraction light 11 reflected by the interference pattern of the generated hologram after being reflected by the reflection film D3, and the other surface D5b side of the film sheet D5 And recording means (impact head) 12AA having impact pins 12A for crushing a part or all of the recording area D2 at the tapered surface 12A1a of the tip 12A1 of the recording area D2, and the laser light L transmitted through the film sheet D5 is provided. The undestructed recording area D2
0th order light 1 which is reflected light of the laser light L from above the reflective film D3 via the film sheet D5.
When zero and a plurality of diffracted lights 11 and 12 are emitted, the diffracted light detecting means 1 of the plurality of diffracted lights 11 and 12
Central part 11A2 of light receiving surface (imaging surface) 11A21 of 1A2
1a, the first diffracted light 11 for irradiating near 1a,
The angle formed by the laser beam L is θ1 from the irradiation point i on the recording area D2 where the laser light L is irradiated.
When the angle formed between the first diffracted light 11 and the optical path 11 from the zero-order light 10 to the outermost end 11A21c on the light receiving surface 11A21 of 1A2 is θ2, the tip of the impact pin 12A 12A1 tapered surface 12A1
The angle θ of “a” is in the range of θ <π− (θ1 + θ2) where θ1 + θ2 <π.

In the optical recording medium recording / reproducing apparatus according to the present invention, as a recording means for the above-mentioned optical recording medium, in the method based on heat generation of the thermal head, problems such as adhesion between the thermal head and the optical recording medium, foreign matter removal and the like should be solved. This is not adopted because there are many problems, and the problem described in the problem to be solved by the invention described above, that is, unnecessary reflected light generated from the interference fringes of the hologram due to the impact fringe of the hologram is diffracted. CCD as light detection means
The problem of obstructing reading of diffracted light from the interference fringes of other holograms when jumping into the camera is addressed by setting the angle of the tapered surface at the tip of the impact pin to the required angle. It is characterized in that it is prevented from jumping into the detecting means.

The recording / reproducing apparatus of the optical recording medium of the present invention has the structure shown in FIG.
4, FIG. 6, FIG. 6, FIG. 8 and FIG. 9, an optical recording medium insertion slot 10a, an optical system unit 11, a recording system unit 12, a transport system unit 13, an optical recording medium cleaning Unit 14 is built in. Interface boards 11a and 12a are connected to the optical system unit 11 and the recording system unit 12, respectively.

In the optical system unit 11, an optical system member 11A is supported by a pair of long transport members 11b1 and 11b2 so as to be movable left and right. The optical system member 11A has a laser beam irradiation unit 11A1 and an image sensor 11A2 attached to and fixed to a support 11A3 at a required angle. The recording system unit 12 has an impact head 12AA provided with an impact pin 12A at a position facing the optical system member 11A. The transport system unit 13 includes a transport belt 13 for transporting the optical recording medium D from the optical recording medium insertion opening 10a to a position immediately below the optical system member 11A.
A. Optical recording medium cleaning unit 14
Is the upper surface D1b of the optical recording medium D inserted from the optical recording medium insertion opening 10a and placed on the long transport belt 13A.
Clean as needed.

As shown in FIGS. 1 and 2, a transmission type optical recording medium D used in the above-mentioned transmission type optical recording medium recording / reproducing apparatus has a recording surface on one surface D1a of a light transmitting substrate D1. The area D2 and the UV protection film D4 are sequentially laminated. A stamper is manufactured from a master (master) formed by drawing interference patterns of a hologram corresponding to a required two-dimensional image, and the stamper is pressed to a predetermined position on one surface D1a of the translucent substrate D1. Thereby, a recording area D2 as a duplicate image of the master is formed.

As shown in FIGS. 3, 4, and 7, the reflection type optical recording medium DD used in the above-mentioned reflection type optical recording medium recording / reproducing apparatus has one surface D1 of a translucent substrate D1.
a, a recording area D2, an aluminum reflective film D3,
The protective film D4 is sequentially laminated. A stamper is manufactured from a master (master) formed by drawing interference patterns of a hologram corresponding to a required two-dimensional image, and the stamper is pressed to a predetermined position on one surface D1a of the translucent substrate D1. Thereby, a recording area D2 as a duplicate image of the master is formed.

Further, as shown in FIGS. 5 and 6, the film reflection type optical recording medium DDD used in the film reflection type optical recording medium recording / reproducing apparatus has an interference fringe of a hologram corresponding to a required two-dimensional image. Is formed from a master (original master) formed by drawing a pattern, and the stamper is pressed to a predetermined position on one surface D1a, and a reflection is formed on a recording area D2 as a duplicate image of the master. A film layer D5 having one surface D5a on which the film D3 is laminated is attached on the substrate D1 via an adhesive layer D6. Here, as the film layer D5, a long film sheet in which units in each of which the reflection film D3 is laminated on the recording area D2 is formed continuously and continuously at a predetermined interval is used as the film reflection type optical recording medium. D
It is cut to the same length as the length of the DD.

FIGS. 1 and 2 show transmitted light (before and after) that the impact pins 12A of the impact head 12AA mechanically destroy the hologram interference fringes as the recording area D2 so that they cannot be repaired. It represents the optical path of (0th order light) 10.

In FIG. 1, θ0 on the side of the laser beam irradiation device (denoted as a light source) 11A1 represents the incident angle of the laser beam L before recording in which the interference pattern of the hologram is not destroyed. Θ0 on the protective film D4 side is a refraction angle of transmitted light corresponding to the incident angle θ0 (incident angle = refractive angle = θ0). In a state before recording, the laser light L having an incident angle θ0 is transmitted and refracted at a refraction angle θ0, so that diffracted lights 11 and 12 are generated on both sides of the transmitted light (zero-order light and reflected light) 10 at a diffraction angle θ1.
At this time, the imaging surface 11A21 of the imaging element 11A2 is arranged so as to receive the diffracted light 11. Further, the diffracted light 11 is applied to the outermost ends 11A21b and 11A21 of the imaging surface 11A21.
The angles formed by the optical paths 11a and 11b of the limit with respect to c and the diffracted light 11 are θ3 and θ2.

When the laser beam L is applied to the portion where the interference fringes of the hologram are destroyed by the impact pin 12A, the transmitted light 100 enters the angular range of (θ2 + θ3) with the diffracted light 11 as the center. , Imaging element 11
This transmitted light 10 jumps into the imaging surface 11A21 of A2. Due to the penetration of the transmitted light 100, the imaging element 11A2 hinders reception of many diffracted lights including the diffracted light 11. The reason for this is that the light intensity of the transmitted light 100 is greater than the light intensity of many diffracted lights, so that the light intensity of the diffracted light 11 from a portion that has not yet been broken near this broken portion can be accurately determined. This is because it is difficult to make accurate measurements and the interference fringes of the hologram cannot be accurately reproduced. As a result, a required two-dimensional image cannot be reproduced. For this reason, as shown in FIG. 2, by setting the angle θ of the tapered surface 12A1a of the tip 12A1 of the impact pin 12A to an angle range described later, unnecessary transmitted light 100 jumps into the imaging surface 11A21 of the imaging element 11A2. Was prevented beforehand.

In FIG. 2, the substrate D1, the recording area D2, and the UV protection film D4 are all deformed along the shape of the angle θ of the tapered surface 12A1a of the tip 12A1 of the impact pin 12A due to the impact of the impact pin 12A. This shows a state in which the optical path of the laser beam L has changed. Since the hologram has been destroyed, no diffracted light 11 or 12 is generated.
Only the transmitted light (zero-order light, reflected light) 100 is transmitted and refracted and takes an optical path 11 of the limit to jump into the imaging surface 11A21 of the imaging element 11A2. Assuming that the angle generated by the deformation of the substrate D1 is θ4, θ4 = (θ1 + θ2).
If θ4 is larger than the illustrated state, the transmitted light 100 is the outermost end 11A21c of the imaging surface 11A21 of the imaging element 11A2.
Do not hang on.

The above conditions are used to make the impact pin 12
Angle θ formed by tapered surface 12A1a of tip 12A1 of A
Is θ <π−2 (θ1 + θ2) where θ1 + θ2 <π / 2

The angle θ4 shown in FIG.
Since the substrate D1, the recording area D2, and the UV protection film D4 were all deformed along the shape of the angle θ of the tapered surface 12A1a of the tip 12A1 of the impact pin 12A by the impact of A, the laser beam L from the laser beam irradiation device 11A1 was deformed. Is the angle at which the transmitted light 100 is displaced. That is, the angle θ4 is an angle between the transmitted light 10 before impact and the transmitted light 100 after impact.

On the other hand, FIGS. 3 and 4 show an impact head 12A in a reflection type optical recording medium recording / reproducing apparatus.
A represents the optical path of the reflected light (zero-order light) 10 before and after mechanically destroying the interference fringes of the hologram, which is the recording area D2, so that it cannot be repaired by the impact pin 12A of A. The laser beam L from the laser beam irradiation device 11A1 is applied to the other surface D1 of the substrate D1 of the reflection type optical recording medium DD.
Refraction (refractive index n) occurs when the light enters b and exits from the other surface D1b again.

In FIG. 3, θ0 on the side of the laser beam irradiation device (denoted as a light source) 11A1 represents the incident angle of the laser beam L before recording in which the interference fringes of the hologram are not destroyed. Before recording, the laser beam L at the incident angle θ0
Is also refracted and reflected at θ0, so that the diffraction angle θ1
Then, diffracted lights 11 and 12 are generated on both sides of the reflected light (zero-order light) 10 (incident angle = reflection angle = θ0). At this time, the imaging surface 11A21 of the imaging element 11A2 is arranged so as to receive the diffracted light 11. Also, let θ3 and θ2 be the angles formed by the optical paths lla and 11b with the diffracted light 11 as far as the diffracted light 11 reaches the outermost ends 11A21b and 11A21c of the imaging surface 11A21.

After destruction of the interference fringes of the hologram by impact of the impact pin 12A, the recording area D2, which has become a destructive hologram in which the laser beam L is no longer diffracted, does not produce diffracted light due to the reflection effect of the aluminum reflection film D3. Light L is reflected as reflected light 100. Depending on the angle at which the interference fringes of the hologram are crushed, the reflected light 100 may reach the imaging surface 11A21 of the imaging device 11A2, which hinders information reading of the imaging device 11A2 as described above. For this purpose, as shown in FIG.
By setting the angle θ of the tapered surface 12A1a of the tip 12A1 of the 2A to an angle range described later, unnecessary reflected light 100 is prevented from jumping into the imaging surface 11A21 of the imaging element 11A2.

In FIG. 4, the reflected light 100 is (θ1-θ3).
When it rotates to the perpendicular side (vertical axis side y) by the angle of, it hangs on the imaging surface 11A21 of the imaging element 11A2. Also, (θ2 +
θ3), the reflected light 100
Deviates from the imaging surface 11A21. Therefore, (θ1 + θ
The surface on which the destructive hologram exists is tilted by the impact of an impact pin 12A having a tapered surface 12A1a with an angle θ at its tip 12A1 so as to rotate the optical path 11 of the transmitted light 100 to the perpendicular y side more than the angle of 2). If it is reflected light 10
0 does not enter the image sensor 11A2.

Also, even if the optical path 11 of the reflected light 100 falls on the horizontal plane (the plane perpendicular to the vertical axis y) from the angle of (θ1−θ3), the imaging surface 11A21 of the imaging element 11A2
In this case, it is possible to prevent the reflected light from entering the taper surface 12A1 of the impact pin 12A.
The angle of 1a is too small, requiring a great deal of force for driving, and cannot be used in practice.

The impact pins 12 satisfy the above conditions.
Angle θ formed by tapered surface 12A1a of tip 12A1 of A
Is θ <π− (θ1 + θ2) where θ1 + θ2 <π This angle is the same in the case of a film transfer type optical recording medium.

On the other hand, FIGS. 5 and 6 show reflected light before and after mechanically destroying the interference fringes of the hologram, which is the recording area D2, by the impact pins 12A of the impact head 12AA so that they cannot be repaired. It represents the optical path of (0th-order light) 10. Laser beam irradiation device 11A
The laser light L from 1 is a film reflection type optical recording medium DD
Refraction (refractive index n) occurs when the light enters the other surface D5b of the film layer D5 of D and exits from the other surface D5b again.

In FIG. 5, θ0 on the side of the laser beam irradiation device (denoted as a light source) 11A1 represents the incident angle of the laser beam L before recording in which the interference fringes of the hologram are not destroyed. Before recording, the laser beam L at the incident angle θ0
Is also refracted and reflected at θ0, so that the diffraction angle θ1
Then, diffracted lights 11 and 12 are generated on both sides of the reflected light (zero-order light) 10 (incident angle = reflection angle = θ0). At this time, the imaging surface 11A21 of the imaging element 11A2 is arranged so as to receive the diffracted light 11. Also, let θ3 and θ2 be the angles formed by the optical paths lla and 11b with the diffracted light 11 as far as the diffracted light 11 reaches the outermost ends 11A21b and 11A21c of the imaging surface 11A21.

After destruction of the interference fringes of the hologram by impact of the impact pin 12A, the recording area D2, which is a destructive hologram in which the laser beam L is no longer diffracted, does not produce diffracted light due to the reflection effect of the aluminum reflection film D3. Light L is reflected as reflected light 100. Depending on the angle at which the interference fringes of the hologram are crushed, the reflected light 100 may reach the imaging surface 11A21 of the imaging device 11A2, which hinders information reading of the imaging device 11A2 as described above. For this purpose, as shown in FIG.
By setting the angle θ of the tapered surface 12A1a of the tip 12A1 of the 2A to an angle range described later, unnecessary reflected light 100 is prevented from jumping into the imaging surface 11A21 of the imaging element 11A2.

In FIG. 6, the reflected light 100 is (θ1-θ3).
When it rotates to the perpendicular side (vertical axis side y) by the angle of, it hangs on the imaging surface 11A21 of the imaging element 11A2. Also, (θ2 +
θ3), the reflected light 100
Deviates from the imaging surface 11A21. Therefore, (θ1 + θ
The surface on which the destructive hologram exists is tilted by the impact of an impact pin 12A having a tapered surface 12A1a with an angle θ at its tip 12A1 so as to rotate the optical path 11 of the transmitted light 100 to the perpendicular y side more than the angle of 2). If it is reflected light 10
0 does not enter the image sensor 11A2.

Also, even if the optical path 11 of the reflected light 100 falls on the horizontal plane (the plane perpendicular to the vertical axis y) from the angle of (θ1−θ3), the imaging surface 11A21 of the imaging element 11A2
In this case, it is possible to prevent the reflected light from entering the taper surface 12A1 of the impact pin 12A.
The angle of 1a is too small, requiring a great deal of force for driving, and cannot be used in practice.

The impact pin 12 which satisfies the above conditions is provided.
Angle θ formed by tapered surface 12A1a of tip 12A1 of A
Is θ <π− (θ1 + θ2) where θ1 + θ2 <π

[Embodiment] Next, as a specific example of the above-mentioned optical recording medium recording / reproducing apparatus of the present invention, a reflection type optical recording medium recording / reproducing apparatus C and a reflection type optical recording medium DD used in this apparatus will be described. .

As shown in FIG. 5, the reflection type optical recording medium DD has a recording area D2, an aluminum reflection film D3, and a UV protection film on one surface D1a of a translucent substrate D1 having a refractive index of n. D4 are sequentially laminated. As described above, the recording area D2 is obtained by duplicating and transferring a drawing of interference fringes of a hologram corresponding to a required two-dimensional image.
Specifically, the substrate D1 has a thickness of 0.5 mm to 1.2 mm.
It is a card-like product made by molding polycarbonate.
On one surface D1a of the substrate D1, a recording area D2 engraved on a molding stand (not shown) is simultaneously molded in a concave shape. The recording area D2 is offset from the center position of the substrate D1 in the width direction by several mm. The aluminum reflective film D3 is formed by sputtering slightly larger than the recording area D2. U
The V protection film D4 is applied and solidified on the entire surface D1a of the substrate D1 from above the aluminum reflection film D3.

The destruction of the above-mentioned interference fringes of the hologram by the impact pins 12A is performed from the UV protection film D4 side. The irradiation of the laser beam L is performed from the other surface D1b side of the substrate D1.

As shown in FIGS. 8 and 11, the reflection type optical recording medium recording / reproducing apparatus C includes an optical system member 11A of the optical system unit 11 (an integrated unit of the laser beam irradiating device 11A1 and the image pickup device 11A2) and a recording device. The impact head 12AA constituting the system unit 12 is provided with a predetermined gap with the reflective optical recording medium DD in order to accurately destroy the interference fringes of the hologram and accurately obtain the diffracted light.
It is a structure arranged to face each other.

Further, a reflection type optical recording medium recording / reproducing apparatus C
In order to make a compact information recording / reproducing apparatus utilizing the outer shape of the reflection type optical recording medium DD, a transport system unit 13 in which the optical recording medium DD is placed horizontally is provided. The optical system unit 11 further includes an optical recording medium DD mounted at a predetermined recording / reproducing position so that contaminants such as dust do not easily adhere to the imaging surface 11A21 of the imaging element 11A2.
It is arranged above. Further, the impact head 12AA is located below the optical recording medium DD placed at the predetermined recording / reproducing position in order to destroy a desired portion of the interference pattern of the hologram from the protective layer D4 side, and It is arranged on the opposite side of the optical system unit 11.

The cleaning of the other surface D1b of the substrate D1 of the reflection type optical recording medium DD irradiated with the laser beam L needs to be performed before the optical recording medium DD is transported to the predetermined recording / reproducing position. Therefore, the optical recording medium cleaning unit 14 is disposed near the insertion opening 10a and above the other surface D1b of the substrate D1 of the optical recording medium DD.
The optical recording medium DD is an optical recording medium insertion opening 10a of the transport system unit 13 at the center left end of the reflection type optical recording medium recording and reproducing apparatus C.
Inserted from. The optical recording medium DD is transported to the predetermined recording / reproducing position by a rubber roller 1 by a driving motor M1.
3B1 and 13B2 are rotated and pressed, and are conveyed by detecting the optical recording medium DD with the photodetectors 13C1 and 13C2.

The optical recording medium DD is moved up to the predetermined recording / reproducing position determined by its outer shape.
It is transported in 3B2. A recording unit 12 having an impact head 12AA strikes an impact pin 12A into an intended recording area D2 with respect to an optical recording medium DD fixed by an optical recording medium holding mechanism (not shown), and an interference fringe of a hologram there is present. And irreversibly rewrite (record) information as a result.

FIG. 10 is a diagram showing the horizontal positional relationship between the optical system member 11A, the optical recording medium DD, and the impact head 12AA at the predetermined recording / reproducing position. For example, a laser beam irradiation unit 11 having a diameter of 6 mm
A1 and an image sensor 11A2 of 10 mm square form an optical member 11A integrally, and are substantially parallel to a recording area D2 surface of the optical recording medium DD (the other surface D1b of the substrate D1) with a predetermined gap. It is arranged so that it can be moved to. The laser beam L emitted from the laser beam irradiation unit 11A1 has an incident angle θ0 = 4 with respect to the surface of the recording area D2.
Incident at 5 °. Accordingly, assuming that the angle between the diffracted lights 11 and 12 due to the interference fringes of the hologram on the recording area D2 and the reflected light (zero-order light) 10 of the laser light L is θ1, the angles of θ1 are set on both sides of the reflected light 10. Diffracted light l1,
Although l2 appears, the diffracted light l2 closer to the horizontal plane can be ignored since it does not enter the imaging surface 11A21 of the imaging element 11A2.

The near-vertical diffracted light 11 and the image sensor 1
Optical paths lla and l extending over the outermost end 11A21b (upper limit and lower limit of the imaging element 11A2) of the imaging surface 11A21 of 1A2.
Assuming that the angles formed by lb are θ2 and θ3, in order to prevent the reflected light 10 from impinging on the imaging surface 11A21 of the imaging element 11A2, as described above, the impact pins 12
Angle θ formed by tapered surface 12A1a of tip 12A1 of A
May be determined so that θ <π− (θ1 + θ2).

In this embodiment, θ1 = 32 ° and θ2 = 8
And θ3 = 12 °, the angle θ formed by the tapered surface 12A1a of the tip 12A1 of the impact pin 12A is:
θ <140 °. Here, assuming that the light receiving position i on the interference fringe of the destroyed hologram rises by 0.1 mm due to the impact pin 12A driving, the incident light θ
Since 0 is 45 °, the imaging surface 11A2 of the imaging element 11A2
The displacement of the light receiving position i on the interference pattern of the hologram viewed from the light receiving point of the diffracted light on 1 can be approximated to 0.1 mm × √2 = about 140 μm. In this embodiment, the distance from the light receiving position i on the interference pattern of the hologram to the light receiving point of the diffracted light on the imaging surface 11A21 of the image sensor 11A2 is 10 mm. Is about 0.8
°.

In other words, the angle change of the reflected light 10 due to the displacement of the light receiving position i on the interference fringe of the hologram due to the impact pin 12A being driven is about 0.8 °, which is sufficiently larger than the angle change due to the reflected light impact. It is a small value. When the angle of the tapered surface 12A1a of the tip 12A1 of the impact pin 12A is 140 °, the impact pin 12
Since the resistance at the time of implantation of A is large and the interference fringes of the hologram cannot be sufficiently destroyed, the depth of the light receiving position i, which is the destroyed portion, is set to about 0.1 m in consideration of the angle change of the reflected light.
m, the tapered surface 12A1 of the tip 12A1 of the impact pin 12A so that the impact mark has a diameter of 0.2 mm.
The angle θa was set to 90 ° so that a hologram of 0.1 mm square could be stably destroyed.

The above-mentioned reflection type optical recording medium recording / reproducing apparatus C
Is performed as follows. As shown in FIG.
The presence or absence of the optical recording medium DD is detected by a sensor (not shown) provided in the optical recording medium insertion opening 10a (step S1 in FIG. 9). When the optical recording medium DD is detected, the driving motor Ml starts driving, and the rubber roller 1 is rotated by the rotation of the driving motor Ml.
The optical recording medium DD is conveyed by the rotational compression bonding of 3B1 and 13B2 (step S2 in FIG. 9). The medium is transported to the predetermined recording / reproducing position determined by the outer shape of the optical recording medium DD.
At the time of this transfer, the presence or absence of the recording area D2 is checked (FIG. 9).
Steps S3 and S4).

Only the specific diffracted light 11 reflected by the laser beam L and reflected on the recording area D2 is captured by the image sensor 11A2 (step S5 in FIG. 9). At the same time, the optical member 11
The transfer of A is started so that the laser light L is irradiated onto the entire recording area D2, and the diffracted light obtained by this irradiation is sequentially captured by the image pickup device 11A2 (step S in FIG. 9).
6). After taking in the diffracted light up to the final recording area D2, it is determined whether or not the optical recording medium DD is genuine, and if not, the optical card D is ejected (step S7 in FIG. 9).

On the other hand, in the case of the intrinsic one, the impact head 12AA is moved to the recording area D2 of the part to be recorded, and the part is hit by the tapered surface 12A1a of the tip 12A1 of the impact pin 12A, and the interference fringes of the hologram are removed. It is crushed (steps S8 and S9 in FIG. 9). Thereafter, it is confirmed that the information has been recorded thereon by the image sensor 11A2. If it cannot be confirmed, it is recorded again (step S10 in FIG. 9). When the recording is confirmed, the optical recording medium DD is ejected. When the ejection of the optical recording medium DD is confirmed by the sensor of the optical recording medium insertion opening 10a, the transfer is stopped (steps S11 and S12 in FIG. 9).

[0057]

As described above, according to the apparatus of the present invention, the interference fringes of the hologram corresponding to the required two-dimensional image in the recording area formed on the optical recording medium are formed at the tip of the impact pin of the impact head. Even if the broken part is irradiated with laser light after being destroyed, the angle of the tapered surface of the tip of the impact pin is adjusted so that the reflected light from the broken part does not jump into the diffracted light detection means. Can be set. Therefore, the diffracted light detecting means can prevent such reflected light from entering beforehand, so that the interference fringes of the hologram other than the destroyed portion can be satisfactorily read out. There are effects such as improvement in reliability.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a state before recording using a transmission type optical recording medium recording / reproducing apparatus which is a first embodiment of the optical recording medium recording / reproducing apparatus of the present invention.

FIG. 2 is a diagram for explaining a state after recording using a transmission type optical recording medium recording / reproducing apparatus which is a first embodiment of the optical recording medium recording / reproducing apparatus of the present invention.

FIG. 3 is a diagram for explaining a state before recording of a reflection type optical recording medium recording / reproducing apparatus which is a second embodiment of the optical recording medium recording / reproducing apparatus of the present invention.

FIG. 4 is a diagram for explaining a state after recording of a reflection type optical recording medium recording / reproducing apparatus which is a second embodiment of the optical recording medium recording / reproducing apparatus of the present invention.

FIG. 5 is a diagram for explaining a state before recording of a film reflection type optical recording medium recording / reproducing apparatus which is a third embodiment of the optical recording medium recording / reproducing apparatus of the present invention.

FIG. 6 is a diagram for explaining a state after recording of a film reflection type optical recording medium recording / reproducing apparatus which is a third embodiment of the optical recording medium recording / reproducing apparatus of the present invention.

FIG. 7 is a diagram for explaining the structure of an optical recording medium used in the apparatus of the present invention.

FIG. 8 is a schematic configuration diagram of an optical recording medium recording / reproducing apparatus of the present invention.

FIG. 9 is a flowchart for explaining a recording operation of the optical recording medium recording / reproducing apparatus of the present invention.

FIG. 10 is a diagram for explaining a main part of an optical recording medium recording / reproducing apparatus of the present invention.

FIG. 11 is a view for explaining an internal arrangement of the apparatus of the present invention shown in FIG. 8;

FIG. 12 is a diagram for explaining a schematic configuration of a conventional optical recording medium recording / reproducing apparatus.

FIG. 13 is a plan view of an optical recording medium.

FIG. 14 is a side sectional view of an optical recording medium.

FIG. 15 is a diagram for explaining the operation of the optical recording medium recording / reproducing apparatus shown in FIG.

[Explanation of symbols]

11A2 Image sensor (diffraction light detecting means) 11A21 Imaging surface (light receiving surface) 11A21a Central portion 11A21b, 11A21c Outermost end 12A Impact pin 12A1 Tip 12A1a Tapered surface 12AA Impact head (recording device) C Optical recording medium recording / reproducing device D Transmission Type optical card, transmission type optical recording medium DD reflection type optical card, reflection type optical recording medium DDD film reflection type optical card, film reflection type optical recording medium D1 substrate (translucent substrate) D1a upper surface (one surface) D1b other D2 Recording area, hologram D3 Aluminum reflective film (reflective film) D4 UV protective film (transparent protective film) D5 Film layer (film sheet) D5a Upper surface (one surface) D5b Other surface D6 Adhesive layer i Irradiation point L laser beam l0, l00 0th order light l1 first diffracted light l2 diffracted light l , Lla, llb optical path θ, θ1, θ2 angle θ0 angle of incidence

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) G11B 7/0033 G11B 7/0033 7/0065 7/0065

Claims (3)

[Claims] 1. A recording area formed on one surface of a translucent substrate, wherein the recording area is obtained by duplicating a hologram interference fringe corresponding to a required two-dimensional image, and laminated on the recording area. An optical recording medium having an optical recording medium having a light-transmitting protective film, and recording information in the recording area by destroying part or all of the recording area, and reproducing the recording area. A laser beam obliquely incident on the other surface of the light-transmitting substrate at a predetermined incident angle is transmitted through the light-transmitting substrate and is irradiated on the recording area, and the recording is performed by the irradiation. Diffracted light detecting means for detecting, via the light-transmitting protective film, diffracted light due to interference fringes of a hologram generated on the area; and, from the light-transmitting protective film side, a part or all of the recording area at its tip. Pressure at the taper surface Recording means having an impact pin to irradiate the laser light transmitted through the translucent substrate onto the undestructed recording area, and from above the recording area via the translucent protective film. A first diffracted light that irradiates near the center of the light receiving surface of the diffracted light detection means among the plurality of diffracted lights when the zero-order light, which is the transmitted light of the laser light, and the plurality of diffracted lights are emitted. The angle between the zero-order light and the zero-order light is θ1, the outermost end farthest from the zero-order light on the light-receiving surface of the diffracted light detecting means from the irradiation point on the recording area irradiated with the laser light. When the angle between the optical path up to the portion and the first diffracted light is θ2, the angle θ of the tapered surface at the tip of the impact pin is θ <π-2 (θ1 + θ2) where θ1 + θ2 <π / 2. An optical recording medium recording / reproducing apparatus characterized by being in an angle range. 2. A recording area formed on one surface of a translucent substrate, wherein the recording area is obtained by duplicating a hologram interference fringe corresponding to a required two-dimensional image, and is laminated on the recording area. Reflected film, the optical recording medium having a protective film laminated on the reflective film, information is recorded in the recording area by destroying a part or all of the recording area, the recording area An optical recording medium recording / reproducing apparatus for reproducing, wherein laser light obliquely incident on the other surface of the translucent substrate at a predetermined incident angle is transmitted through the translucent substrate and onto the recording area. Irradiating, and diffracted light detecting means for detecting, through the translucent substrate, diffracted light due to interference fringes of a hologram generated on the recording area by the irradiation, and then detecting the diffracted light via the transparent substrate; From the record Recording means having an impact pin for crushing a part or all of the laser beam at the tapered surface at the tip thereof, and irradiating the laser beam transmitted through the light-transmitting substrate onto the undestructed recording area, When zero-order light, which is reflected light of the laser light, and a plurality of diffracted lights are emitted from the reflective film through the translucent substrate, the light received by the diffracted light detecting means out of the plurality of diffracted lights. The angle between the first diffracted light irradiating near the center of the surface and the zero-order light is θ1, and the irradiation point on the recording area irradiated with the laser light is on the light receiving surface of the diffracted light detecting means. When the angle between the optical path from the zero-order light to the farthest end and the first diffracted light is θ2, the angle θ of the tapered surface at the tip of the impact pin is θ <π − (Θ1 + θ2) Note that the angle range is θ1 + θ2 <π. Optical recording medium recording and reproducing apparatus according to. 3. A film sheet having one surface on which a reflective film is laminated on a recording area formed by transferring the same non-inverted image as an image in which interference fringes of a hologram corresponding to a required two-dimensional image is drawn, An optical recording medium recording an optical recording medium adhered on a substrate via an adhesive layer, by recording information in the recording area by destroying a part or all of the recording area, and reproducing the recording area. A reproducing apparatus, wherein a laser beam obliquely incident on the other surface of the film sheet at a predetermined incident angle is transmitted through the film sheet and is irradiated on the recording area, and the recording area is irradiated by the irradiation. Diffracted light detecting means for detecting, via the film sheet, diffracted light due to interference fringes of the hologram generated on the reflection film, and the other surface side of the film sheet Recording means having impact pins for crushing a part or all of the recording area at the tapered surface at the tip thereof, and irradiating the laser beam transmitted through the film sheet onto the undestructed recording area. When the zero-order light, which is the reflected light of the laser light, and the plurality of diffracted lights are emitted from the reflective film through the film sheet, the light received by the diffracted light detecting means out of the plurality of diffracted lights. The angle formed by the first diffracted light irradiating near the center of the surface and the zero-order light is θ
1. an optical path from the irradiation point on the recording area irradiated with the laser light to the outermost end farthest from the zero-order light on the light receiving surface of the diffracted light detecting means; Assuming that the angle between the light and the light is θ2, the angle θ of the tapered surface at the tip of the impact pin is θ <π− (θ1 + θ2) where θ1 + θ2 <π. apparatus.