JP2705321B2 - Optical card and optical card recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical card and a recording device for the optical card.

[0002]

2. Description of the Related Art In recent years, bank cards, credit
It is well known that cards, identification cards, memory cards, and cards for various uses are widely used. A rectangular card having the same shape and dimensions as a credit card widely used in society as described above is provided with an optical recording material layer, and the card is used as a so-called optical card as a recording medium for various information. Attempts have also been made to do so, for example, a rectangular card having the same shape and dimensions as a credit card widely used in society, for example, for a long time of light with a light intensity equal to or less than a predetermined threshold. A light which is not recorded even by irradiation, and has a recording layer having a two-dimensional spread made of a recording material such that recording is performed by irradiation of light having a light intensity equal to or higher than the predetermined threshold. The card is a displacement driving device for relatively linearly reciprocating the recording layer and the recording / reproducing element during the operation of recording the information signal on the recording layer and the operation of reproducing the information signal from the recording layer. However, although it has been pointed out that the structure is more complicated than that of a disk rotation drive mechanism in a disk-shaped information recording medium (disk) recording / reproducing apparatus, and kinetic energy is lost and vibration is large during operation. However, a rectangular card having the same shape and dimensions as a credit card widely used in society is familiar to the general public, and one optical card can record about 2 megabytes of information. Since it is possible, it is expected to be used in various applications. For example, Drexela Technology, Inc. of the United States has announced an example of the above-mentioned optical card.

In the optical card manufactured by Drexla Technology of the United States, a clock track is recorded and formed at one end of a recording area set in advance on a recording surface of the card, and the other end is formed with a clock track. A track for tracking control by continuous linear grooves is recorded and formed in advance as information for tracking control, and a track of an information signal is recorded and formed in a portion between the clock track and the tracking control track. When an information signal to be recorded is recorded on the information signal track on the optical card, the laser light emitted from the light source in the recording / reproducing device is collimated by a collimator lens and diffracted. The three light beams emitted from the diffraction grating are made incident on the grating, and then made incident on the focusing lens. In the above, the three light beams are focused to form an image on the clock track of the recording area of the optical card as a light spot having a small diameter, and the light spot having a small diameter is formed on the tracking control track. Further, a light spot having a small diameter, which is intensity-modulated by the information signal to be recorded on the track of the information signal, is imaged so that the optical card and the light spot are relatively displaced and driven. Thus, an information signal is recorded on a track of the information signal in a sequential recording area of the optical card by a light spot having a small diameter whose intensity is modulated by the information signal to be recorded.

That is, an optical card is not recorded by irradiation with light having a light intensity less than a predetermined threshold value for a long time, and recording is performed by irradiation with light having a light intensity not less than the predetermined threshold value. A recording layer having a two-dimensional spread of a suitable recording material, and irradiates a track of the information signal with light having a light intensity equal to or higher than the above-mentioned predetermined threshold by the information signal during the recording operation. As a result, the information signal to be recorded by the light spot Si having a small diameter is recorded on the recording layer. Also, in the operation of reproducing the information signal from the optical card, three light beams having a constant light intensity equal to or less than a predetermined threshold value are made incident on the condenser lens so that recording is not performed on the recording layer of the optical card. A light spot having a small diameter is formed on the clock track in the recording area, and a light spot having a small diameter is formed on the tracking control track, so that the optical card and the light spot are relatively positioned. And the reflected light from the above light spot is given to the photodetector.

When recording an information signal having a large amount of information on an optical card, the track pitch of the information signal naturally becomes small, but it is widely used. As for optical cards and optical card recording / reproducing devices, it is necessary to increase the mechanical precision of optical cards and optical card recording / reproducing devices to support high-density recording in terms of price. Therefore, in the conventional example described above, high-density recording / reproduction can be performed by applying means such as tracking control. However, in the conventional optical card described above, the entire recording area is not used for recording the information signal. Instead of the information signal track, each recording area includes a clock track and a tracking control track. Since the recording capacity per area has been reduced due to the provision of a track, there is no need for a track for tracking control (and for focusing control), etc.
The emergence of an optical card capable of high-density recording has been anticipated.

As an optical card capable of solving the above-mentioned problems, the present applicant has previously disclosed in Japanese Patent Laid-Open No. 2-6672.
No. 4 and JP-A-2-68720 have proposed an optical card LAC. FIG. 5 is a perspective view showing a configuration example of an optical card LAC disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2-66724, and FIG. 6 is a perspective view showing an example of an optical card LAC disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2-68720. FIG. 9 is a perspective view showing a configuration example, and FIG.
FIG. 7 is a side sectional view for explaining the operation of the optical card shown in FIGS. 5 and 6. The optical card LAC illustrated in FIG. 5 has a convex lens array F in which a plurality of minute convex lenses are two-dimensionally arranged in a predetermined arrangement mode.
The EL is composed of a stack of the convex lens array FEL and the individual convex lenses and the recording layer RML in which a recording / reproducing area corresponding to each convex lens is formed. The above-mentioned recording layer RM individually corresponding to the individual convex lenses arranged in a dimension.
Each of the recording / reproducing areas in a predetermined number of units, which is set so that the individual recording / reproducing areas in L are two-dimensionally divided and the individual information is recorded / reproduced, respectively, corresponds to the light of the convex lens. The focus of each convex lens in the convex lens array FEL is such that, when viewed through the convex lens from different predetermined angles with respect to the axis, only one specific unit recording / reproducing area appears enlarged by the convex lens. Recording layer RML near the surface
Is a configuration mode in which is positioned.

The optical card LAC illustrated in FIG.
Are formed with a cylindrical convex lens array CLA in which cylindrical convex lenses of minute width are closely arranged in parallel and individual recording / reproducing regions individually corresponding to the individual cylindrical convex lenses constituting the cylindrical convex lens array CLA. And a recording layer RML in which individual recording / reproducing regions are formed, which individually correspond to the individual cylindrical convex lenses constituting the cylindrical convex lens array CLA. In each of the recording / reproducing areas of a predetermined number of units, each of which is divided into two-dimensionally and the individual information is set to be recorded / reproduced, a cylindrical convex lens is provided. Of each group arranged on one individual straight line parallel to the cylindrical axis of When the recording / reproducing area is viewed through the cylindrical convex lens from different predetermined angles with respect to the optical axis of the cylindrical convex lens, only a specific group of unit recording / reproducing areas are respectively formed by the cylindrical convex lens. This is a configuration in which the recording layer RML is positioned near the focal plane of each cylindrical convex lens in the above-mentioned cylindrical convex lens array CLA so as to be viewed as an enlarged one.

The optical card LAC shown in FIGS. 5 and 6
In the above, the substrate BP has a laminated structure of the protective layer 1 and the base material 2, and the recording layer RML is not recorded even by long-time irradiation with light having a light intensity less than a predetermined threshold value. Is formed by two-dimensional spreading of a recording material on which recording is performed by irradiation with light having a light intensity equal to or higher than the threshold value of the recording layer RML. Layer (crust layer)
4 and a lower gelatin layer 3 are provided on the optical card LAC by the heat of the light when the light having a light intensity equal to or more than the threshold light intensity is incident on the optical card 1 for recording an information signal. Organic colloidal (gelatin) containing silver particles provided on the focal plane of the convex lens of the convex lens array FEL
The recording layer RML has a configuration in which silver particles of the silver salt pattern layer 4 are dissolved in the lower gelatin layer 3 to form pits, and recording corresponding to an information signal is performed on the recording layer. .

In order to record (write) required information on the recording layer RML in the optical card LAC configured as described above, for example, FIG. 8 of JP-A-2-66724 or FIG. The recording can be performed by using an optical card recording / reproducing apparatus having a configuration as shown in FIG. 2 of 2-68720. FIG. 7 shows the shape and dimensions of one convex lens of the convex lens array FEL provided on the optical card LAC provided with the convex lens array FEL having the configuration as shown in FIG. When a parallel light beam having substantially the same cross-sectional shape and cross-sectional size is made incident on one convex lens in the convex lens array FEL, the light is incident on the convex lens by changing the incident direction of the light to a specific direction. That the position of the light spot formed in the recording / reproducing area corresponding to the convex lens on which the light is incident can be set to a specific position in the recording / reproducing area, respectively, and FIG.
And the parallel shape of the cross-sectional shape and the cross-sectional dimension substantially equal to the shape and the size of one cylindrical convex lens of the cylindrical convex lens array CLA provided in the optical card LAC provided with the cylindrical convex lens array CLA having the configuration shown in FIG. When the light beam is made incident on one cylindrical convex lens in the cylindrical convex lens array CLA, the incident direction of the incident light on the cylindrical convex lens is changed so as to be a specific direction, whereby the light is incident on the cylindrical convex lens. It is illustrated and described that the position of the light spot formed in the recording / reproducing area corresponding to the above can be set to a specific position in the recording / reproducing area.

That is, in FIG. 7, a convex lens array in which a parallel light beam having a cross-sectional shape and a cross-sectional dimension substantially equal to the shape and the size of one convex lens in the convex lens array FEL from the lens 5 of the recording / reproducing structure is provided on the optical card LAC. When the light is incident on one convex lens Lα in the FEL, the direction of light incident on one convex lens Lα in the convex lens array FEL from the recording / reproducing structure is indicated by P1, P2, and P3 in FIG. If you change to
The incident light in each direction such as P1, P2, and P3 is located at a different position in the recording / reproducing area corresponding to the convex lens Lα at the light spots Sα1, Sα2, and Sα.
α3 is generated, and a parallel light beam having a cross-sectional shape and a cross-sectional dimension substantially equal to the shape and the size of one cylindrical convex lens in the cylindrical convex lens array CLA from the lens 5 of the recording / reproducing structure is provided on the optical card LAC. In the case where the light is incident on one cylindrical convex lens Lα in the convex lens array CLA, the direction of light incident on one cylindrical convex lens Lα in the cylindrical convex lens array CLA from the recording / reproducing structure is P1, in FIG. P2, P
3, the incident light in each direction, such as P1, P2, P3, described above, has a light spot Sα1, at a different position in the recording / reproducing area corresponding to the cylindrical convex lens Lα. The light spot Sα2 and the light spot Sα3 are shown.

As described with reference to FIG. 7, the direction of light incident on one successive convex lens in the convex lens array FEL provided on the optical card LAC from the recording / reproducing structure is set to a specific direction, and the convex lens is set. Array FE
Each recording / reproducing area corresponding to each convex lens in L is two-dimensionally divided, and a predetermined number of units of recording / reproducing are recorded in each recording / reproducing area corresponding to each recording / reproducing area. The information recorded in each area is recorded in the recording / reproducing area of the unit in the same incident direction as that of the light incident on the convex lens when the information signal is recorded in the recording / reproducing area of the unit. When a signal is recorded, light having the same cross-sectional area as light incident on the convex lens is read out by reflected light obtained by being incident on the convex lens, and recording information to be read corresponds to recording information corresponding to one convex lens. A specific one of a plurality of recording / reproducing areas set in the reproducing area is read out as being enlarged to the size of the convex lens, and provided from the recording / reproducing structure to the optical card LAC. And to have a direction of light incident on the sequential single cylindrical convex lens in a cylindrical convex lens array CLA each particular direction,
Each recording / reproducing area corresponding to each cylindrical convex lens in the cylindrical convex lens array CLA is two-dimensionally divided, and a predetermined number of recording / reproducing areas corresponding to the respective recording / reproducing areas are determined. The information recorded in the recording / reproducing area of the unit is the same as the incident direction of the light incident on the cylindrical convex lens when the information signal is recorded in the recording / reproducing area of the unit. When an information signal is recorded in the recording / reproducing area, light having the same cross-sectional area as light incident on the cylindrical convex lens is read out by reflected light obtained by being incident on the cylindrical convex lens. The recording / reproducing area of a plurality of units set in the recording / reproducing area corresponding to the cylindrical convex lens has special characteristics. One such is to be read as being enlarged to the same width as the cylindrical convex lens.

Therefore, as described above, the information signals recorded in the recording / reproducing areas of a plurality of units set in the recording / reproducing area corresponding to one convex lens or the cylindrical convex lens are the respective information signals described above. The same size as the convex lens or the same as the cylindrical convex lens by the reflected light generated in the recording layer RML by making the light having the same direction and the same cross-sectional shape as the light used at the time of recording incident on the convex lens or the cylindrical convex lens. Obtained as width. As described above, the optical card LAC shown in FIG. 5 (or FIG. 6) is not recorded even by long-time irradiation of light having a light intensity less than the predetermined threshold, 2 of a recording material in which recording is performed by irradiation of light of light intensity
A recording layer RML formed by dimensional expansion, and a convex lens array FEL (or recording) in which a plurality of minute convex lenses are two-dimensionally arranged on one surface of the recording layer RML in a predetermined arrangement mode. A cylindrical convex lens array CLA in which a plurality of cylindrical convex lenses having a small width are closely arranged in parallel and arranged two-dimensionally on one surface of the layer RML, and the convex lens array FEL described above.
In the individual recording / reproducing areas formed on the recording layer RML corresponding to the individual convex lenses constituting (or the individual cylindrical convex lenses constituting the above-mentioned cylindrical convex lens array CLA) individually, The individual recording / reproducing areas are two-dimensionally divided to set a predetermined number of recording / reproducing areas, and the individual recording / reproducing areas of the above-mentioned units in which individual information is to be recorded / reproduced. When viewed through a convex lens (or cylindrical convex lens) from a different predetermined angle with respect to the optical axis of the convex lens (or cylindrical convex lens), only one specific unit of recording / reproducing area is the same as the convex lens. The above-described convex lens array FEL (or even the same width as that of the cylindrical convex lens) is viewed as having a size (or the same width as the cylindrical convex lens). Is a convex lens array FEL (or cylindrical convex lens array CLA) in which a recording layer is positioned on the focal plane of each convex lens (or cylindrical convex lens) in the cylindrical convex lens array CLA) and at least a part of a pair of recording layers RML is included. Because it is an optical card provided in
A recording / reproducing area corresponding to each convex lens (or cylindrical convex lens) constituting each convex lens array FEL (or cylindrical convex lens array CLA) is composed of a group of a plurality of recording / reproducing areas. The two-dimensional division is performed so that different information signals are recorded / reproduced in the recording / reproducing area of each unit, so that high-density recording / reproducing is performed. Since the information signal is read out after being enlarged to the size of the cross-sectional area of the convex lens, high-density recording and reproduction can be easily performed without using means for automatic tracking control. Therefore, recording and reproduction of information signals can be performed by a recording and reproducing apparatus having a simple mechanism without automatic focus control. And also a convex lens array FE
Since a recording member having a combination of L (or a cylindrical convex lens array CLA) and a recording layer RML is used, for example, FIG. 7 of JP-A-2-66724 or FIG. 8 of JP-A-2-68720. The use of an XYZ plotter as exemplified in (1) above makes it possible to easily record and reproduce stereoscopic image information on the recording layer RML of the optical card LAC.

[0013]

In the already proposed optical card described with reference to FIGS. 5 and 6, a large light is used when writing (recording) information to be recorded on a recording layer by light. In addition to the drawbacks that light of high intensity is required and that the writing speed is slow, new information cannot be written on the recording layer that has been recorded.

[0014]

According to the present invention, there is provided a convex lens array in which a plurality of minute convex lenses are two-dimensionally arranged, and individually corresponding to the individual convex lenses constituting the convex lens array. An optical card comprising a component in which a recording layer on which a recording / reproducing region is formed is laminated, wherein the recording layer is formed by applying a first transparent electrode, a photoconductive layer member, and an electric field. So that the aligned state is maintained even after the removal of the applied electric field,
A polymer-liquid crystal memory film formed by dispersing a liquid crystal having a melting point lower than the melting point of the polymer material in the polymer material, and a laminate including a second transparent electrode And a cylindrical convex lens array in which cylindrical convex lenses of minute width are closely arranged in parallel, and individual recording / reproduction individually corresponding to each of the cylindrical convex lenses constituting the cylindrical convex lens array. An optical card having a component portion in which a recording layer in which a region is formed is laminated, wherein the recording layer has a first transparent electrode, a photoconductive layer member, and an orientation generated by application of an electric field. So that the state is maintained even after the removal of the applied electric field,
A polymer-liquid crystal memory film formed by dispersing a liquid crystal having a melting point lower than the melting point of the polymer material in the polymer material, and a laminate including a second transparent electrode And a lens array using a cylindrical convex lens array in which cylindrical convex lenses having a two-dimensional arrangement of a plurality of minute convex lenses or a cylindrical convex lens having a minute width are closely arranged in parallel. Constituting a lens array, each convex lens or an individual cylindrical convex lens, and a recording layer in which individual recording and reproduction areas corresponding to each other are formed. The first transparent electrode, the photoconductive layer member, and the orientation state generated by the application of the electric field are maintained even after the removal of the applied electric field. A polymer-liquid crystal memory film formed by dispersing liquid crystal having a melting point lower than the melting point of the polymer material in the polymer material, and a second transparent electrode. An optical card recording device in which the polymer-liquid crystal memory film of the optical card is used in response to the change in the electric field intensity applied to the polymer-liquid crystal memory film of the recording layer of the optical card. An operation state in a first operation mode in which an electric field within an electric field intensity range capable of changing the transparency is generated between the first transparent electrode and the second transparent electrode in the recording layer of the optical card; An operation state switching means for switching to an operation state in a second operation mode in which an electric field is not applied between the first transparent electrode and the second transparent electrode in the recording layer of the optical card; Operation state in the first operation mode described above Then, light whose intensity is modulated by the information to be recorded is incident from a lens array, and the light corresponding to the information to be recorded is placed between the first transparent electrode and the second transparent electrode in the recording layer of the optical card. Means for recording an information to be recorded on the recording layer by generating an electric field whose intensity changes with the electric field between the first transparent electrode and the second transparent electrode in the recording layer of the optical card. In the operation state in the second operation mode described above, the liquid crystal is heated to a temperature equal to or higher than the melting point of the liquid crystal dispersed in the polymer-liquid crystal memory film and lower than the melting point of the polymer material. Means for irradiating the lens array with light having an intensity capable of heating the liquid crystal, returning the liquid crystal to an isotropic phase state and erasing the recorded information. A recording device is provided.

[0015]

The melting point of the polymer material is higher than the melting point of the polymer material so that the orientation state of the liquid crystal changed by the application of the electric field with the photoconductive layer member is maintained even after the removal of the applied electric field. An electric field having a predetermined electric field intensity is applied between the transparent electrodes in the recording layer of an optical card including a recording layer formed of a laminate of a polymer-liquid crystal memory film and a transparent electrode formed by dispersing a liquid crystal having a low melting point. As an added state, light whose intensity is modulated by the information to be recorded is made incident from the lens array to record the recording target information on the recording layer. Further, in a state where no electric field is applied between the transparent electrodes in the recording layer of the optical card, light having a higher intensity than at the time of recording information, that is, at a melting point of the liquid crystal dispersed in the polymer-liquid crystal memory film or higher, In addition, light having such an intensity that the liquid crystal can be heated to a temperature lower than the melting point of the polymer material is incident on the lens array to return the liquid crystal to an isotropic phase, thereby erasing recorded information.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of an optical card and an optical card recording apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional side view of an optical card of the present invention, FIG. 2 is a block diagram used for explaining a recording operation and an erasing operation in a recording apparatus of the optical card of the present invention, and FIGS. It is a perspective view of a different configuration aspect of the recording device of the card. FIG. 1 shows a convex lens array FEL in which a plurality of minute convex lenses are two-dimensionally arranged in a predetermined arrangement mode or a cylindrical convex lens array CLA in which cylindrical convex lenses having a minute width are closely arranged in parallel. The lens array, the recording layer RML, the first transparent electrode 12, the photoconductive layer member 11, and the alignment state generated by the application of the electric field are kept high even after the removal of the applied electric field. A liquid crystal material including a laminate of a polymer-liquid crystal memory film 10 formed by dispersing liquid crystal having a melting point lower than the melting point of the above-described polymer material in a molecular material, and a second transparent electrode 9 FIG. 6 is a vertical sectional side view of an optical card LAC that is used and is configured by laminating and combining a lens array and a recording layer. A convex lens array F in which a plurality of minute convex lenses are two-dimensionally arranged.
EL has, for example, an appearance as exemplified by a drawing symbol FEL in FIG. 5, and a cylindrical convex lens array CLA in which cylindrical convex lenses having a small width are closely arranged in parallel is, for example, shown in FIG. Has the appearance as exemplified by the drawing symbol CLA.

In the optical card LAC shown in FIG. 1, the recording layer RML is laminated on the transparent material layer 8 of the substrate BP composed of the transparent material layer 8 and the matte colored layer 7. When the matte color layer 7 is formed as a black matte color layer 7, a reproduced image having the highest contrast in a state where a black image is drawn on a white background is obtained. Now, the liquid crystal used as one of the constituent elements of the polymer-liquid crystal memory film 10 used in the configuration of the recording layer RML of the optical card LAC of the present invention is the other of the polymer-liquid crystal memory film 10. It is sealed in a myriad of fine pores formed in a state of being randomly distributed in a porous polymer material film used as a constituent element. The innumerable fine pores in the polymer material film which are randomly present in the state where the liquid crystal is sealed in the polymer-liquid crystal memory film 10 are formed with high definition by the recording layer RML of the optical card LAC. It is preferable that the diameter of the pores is small so that recording and reproduction can be realized. It is a desirable embodiment that the pores have a diameter of, for example, about 0.5 μm or less. Further, as the liquid crystal used for the configuration of the polymer-liquid crystal memory film 10, a liquid crystal that forms a nematic phase or a cholesteric phase at room temperature is used. The use of such a device produces good results in reproducing recorded information recorded on the recording layer RML of the optical card LAC with a high contrast ratio and in improving recording performance. Further, the fact that a liquid crystal having a melting point lower than that of the polymer material is used as the liquid crystal used for the configuration of the polymer-liquid crystal memory film 10 is recorded in the recording layer RML of the optical card LAC. This is advantageous in that information can be easily erased.

Next, referring to FIGS. 1 and 2, an operation of recording information on the recording layer RML of the optical card LAC of the present invention,
The operation of reproducing and erasing recorded information recorded on the recording layer RML of the optical card LAC of the present invention will be described in order. First, an operation of recording information on the recording layer RML of the optical card LAC of the present invention will be described. When information is recorded on the recording layer RML of the optical card LAC of the present invention, the movable contact a of the operation mode setting switch SW is controlled by the control signal supplied to the control signal supply terminal 17 of the operation mode setting switch SW. , B are turned on. When the movable contact a of the operation mode setting switch SW is turned on as described above, the potential of the light amount control terminal 16 in the light source drive circuit 19 is set to a low level. 20
The light P is emitted from the light source 18 in a state where the intensity P is modulated according to the information to be recorded, which is supplied to the recording medium.

The operation mode setting switch S
When the movable contact b of W is turned on, the first transparent electrode 1 in the recording layer RML of the optical card LAC is turned on.
A power supply 15 is connected between the second transparent electrode 9 and the second transparent electrode 9,
A predetermined electric field is applied between the first and second transparent electrodes 12 and 9 in the recording layer RML of the optical card LAC. In this state, the light P emitted from the light source 18 is used as the convex lens array FEL or the cylindrical convex lens array C.
When the light is focused on the recording layer RML via a lens array such as LA, the first transparent electrode 12, the photoconductive layer member 11, the polymer-liquid crystal memory film 10, and the second transparent electrode 9 are laminated. The electrical resistance value of the photoconductive layer member 11 in the recording layer RML configured as described above changes according to the light amount at the above-mentioned condensing point. Therefore, when the power supply 15 is connected between the first and second transparent electrodes 12 and 9 as described above, the electric resistance value of the photoconductive layer member 11 is condensed there as described above. The electric field intensity distribution applied to the polymer-liquid crystal memory film 10 between the photoconductive layer member 11 of the recording layer RML and the second transparent electrode 9 is changed by changing according to the light amount of the focused light point. , And corresponds to the light amount distribution of the above condensing point.

As described above, the recording layer R of the optical card LAC
A polymer which is placed in an electric field between the photoconductive layer member 11 and the second transparent electrode 9 in the ML and to which an electric field showing an intensity distribution corresponding to the light amount at the above-mentioned condensing point is applied. The nematic liquid crystal or the cholesteric liquid crystal sealed in each of the myriad of minute pores formed randomly and distributed in the porous polymer material film in the liquid crystal memory film 10 is applied to the liquid crystal memory film 10. In a state where the electric field intensity exceeds a certain threshold, the orientation of the polymer-liquid crystal memory film 10 is adjusted according to the magnitude of the electric field intensity so that the transparency of the polymer-liquid crystal memory film 10 increases as the electric field intensity applied thereto increases. As described above, the state of the orientation of the liquid crystal in the pores changed by the electric field applied to the polymer-liquid crystal memory film 10 remains unchanged even when the electric field is removed. It is held in the state.

That is, the recording layer RML of the optical card LAC
In the polymer-liquid crystal memory film 10, the nematic liquid crystal or the cholesteric liquid crystal sealed in each of the myriad of fine pores randomly distributed and formed in the porous polymer material film. Before the application of an electric field above a certain threshold value, the liquid crystal molecules, including the liquid crystal molecules that have been greatly affected by the pore wall surface, are in a nematic phase as a whole and are encapsulated in minute pores. (The liquid crystal molecules enclosed in the pores receive the force of the surface of the pore wall, but the closer the liquid crystal molecules are to the pore wall, the greater the above-mentioned force is applied. Indeed, the effect of the force of the surface of the pore wall on the liquid crystal molecules sealed in the pores becomes greater). As described above, when an electric field having an electric field strength equal to or higher than a certain threshold is applied to the liquid crystal sealed in the pores under the force of the surface of the pore walls, The liquid crystal molecules encapsulated in the nematic phase or the cholesteric phase in the pores under the force from the surface, the direction of the electric field against the force applied from the surface of the pore wall described above. To be oriented.

The mode of the displacement generated in the liquid crystal molecules in response to the application of the electric field changes according to the strength of the applied electric field. The applied liquid crystal molecules are weak, that is,
Only the liquid crystal molecules located mainly near the center of the pores are displaced in such a manner that they are directed in the direction of the applied electric field, and as the strength of the electric field applied to the liquid crystal gradually increases, The liquid crystal molecules to which a strong force is applied, that is, the liquid crystal molecules located close to the pore wall are also displaced in such a manner that the direction of the molecular axis of the liquid crystal is oriented in the direction of the applied electric field. The molecules are oriented. As described above, the nematic phase is formed in the myriad of minute pores that are randomly distributed and formed in the porous polymer material film of the polymer-liquid crystal memory film 10 in the recording layer RML of the optical card LAC. The encapsulated liquid crystal molecules are displaced such that the direction of the molecular axis of the liquid crystal tends to be oriented in the direction of the electric field against the force applied from the surface of the pore wall when the electric field is applied. The liquid crystal molecules aligned by the electric field applied as described above are maintained in the same state by the force of the surface of the pore wall as described above. The state of the orientation of the liquid crystal changed by the application of is maintained as it is even after the applied electric field is removed.
In the recording layer RML of the optical card LAC, the information to be recorded is given in the form of a change in the electric field intensity, so that the information to be recorded is converted into a porous material in the polymer-liquid crystal memory film 10. It is possible to memorize as a state of orientation of liquid crystal molecules sealed in a nematic phase in a myriad of fine pores formed randomly distributed in the polymer material film.

The recording layer RM of the recorded optical card LAC on which the information to be recorded is recorded as described above.
The reproduction (reading) of the recorded information from L is performed by turning off the movable contacts a and b of the operation mode setting switch SW by a control signal supplied to the control signal supply terminal 17 of the operation mode setting switch SW. A signal for supplying a reproduction mode setting signal to the terminal 21 so that the reproduction light P having a predetermined constant light intensity required for reproduction can be emitted from the light source 18 is driven from the light source driving circuit 19 to the light source 18. It is supplied as a signal. In this state, when the light P emitted from the light source 18 is collected on the recording layer RML via a lens array such as a convex lens array FEL or a cylindrical convex lens array CLA, the information recorded on the recording layer RML is lost. An image is reproduced in a white background with contrast to the background. When the matte color layer 7 on the substrate BP of the optical card LAC is configured as a black matte color layer 7,
As described above, a reproduced image having the highest contrast in a state where a black image is drawn on a white background is obtained.

Next, the operation of erasing the recorded information in the recording layer RML of the recorded optical card LAC on which the information to be recorded is recorded as described above is performed by supplying a control signal by the operation mode setting switch SW. The control signal supplied to the terminal 17 turns off the movable contacts a and b of the operation mode setting switch SW, and supplies an erasing mode setting signal to the terminal 21 to provide a strong intensity required for the erasing operation. Is supplied from the light source driving circuit 19 to the light source 18 as a driving signal. In this state, when the strong light P emitted from the light source 18 is condensed on the recording layer RML via a lens array such as a convex lens array FEL or a cylindrical convex lens array CLA, the polymer-liquid crystal memory of the recording layer RML The liquid crystal encapsulated in the innumerable fine pores formed randomly and distributed in the porous polymer material film of the film 11 is higher than the melting point of the liquid crystal and the melting point of the polymer material. By heating the liquid crystal to a lower temperature, the liquid crystal is returned to an isotropic phase, which can be erased by returning the liquid crystal to a nematic phase or a cholesteric phase in a cooled state. That is, as described above, the liquid crystal encapsulated in the myriad of fine pores randomly distributed and formed in the porous polymer material film in the polymer-liquid crystal memory film 11 of the recording layer RML. When heated to a temperature above the melting point of the liquid crystal and below the melting point of the polymer material, the liquid crystal molecules are brought into an isotropic phase by vigorous thermal motion that overcomes the force from the surface of the pore walls. When the optical card LAC is cooled and returned to the nematic phase or the cholesteric phase, the erase operation of the recorded optical card LAC is performed, and the polymer-liquid crystal memory film 11 of the recording layer RML of the optical card LAC is in an opaque state. And erased.

FIG. 3 shows an example of the configuration of a recording apparatus capable of easily recording stereoscopic image information on an optical card LAC having a convex lens array FEL. FIG. 4 shows a recording apparatus having a cylindrical convex lens array CLA. This shows an example of the configuration of a recording apparatus that can easily record stereoscopic image information on the configured optical card LAC. 3 and 4, MB is a machine base, on which the optical card LAC of the present invention is installed. Fyb is a convex lens array FEL of the optical card LAC or the optical card LAC.
Is a transfer body that is displaced and driven by an operation of a driving device DRA described later in a three-dimensional space in front of the device.
First, in the recording apparatus of FIG. 3, a light source PS and an optical system Lo are housed in the transfer body Fyb, and the optical system Lo emits light from the light source PS like a convex lens or a concave mirror, for example. Focused light PS
After forming I, a configuration having a function of dispersing a light beam from the above-mentioned converging point PSI is used. In FIG. 3, the optical system Lo is composed of one convex lens, but when the optical system Lo is composed of a convex lens, it is composed of a combination of a plurality of lenses. Needless to say, those that have been used may be used.

The light source PS housed in the above-mentioned transfer body Fyb focuses light emitted from, for example, an incandescent lamp, a discharge lamp, or any other light-emitting source by a condenser lens, and a pinhole is formed at the condensing point. A divergent light beam radiated from the point light source PS is converged by a convex lens constituting the optical system Lo to form an image of the point light source PS at a converging point PSI. Image. The light-convergent point PSI obtained by converging the luminous flux divergent from the point light source PS by the optical system is set as a new light source PSI (new point light source PSI), and the divergent luminous flux therefrom is used as the optical card L.
The convex lens array FEL in AC is irradiated. The converging point PSI, which is the new point light source PSI, is driven via the above-described transfer member Fyb so as to emit light at a position corresponding to the shape of the three-dimensional image to be recorded. The recording device is driven by displacement by the device DRA, and the entire recording device shown in FIG. 3 is used in a state of being housed in a dark box. And the above-mentioned transfer body Fy
b can be displaced and driven by the driving device DRA so as to be displaced and driven to any position within a predetermined range in a three-dimensional space on the front surface of the convex lens array FEL.

The driving device DRA includes a rail member Rx provided so as to extend in the X-axis direction in the XYZ rectangular coordinate system by the driving rotation of the stepping motor Msx.
Xx-direction transfer body Fx transferred in the X-axis direction along
Is fixed to the transfer body Fx in the X direction.
Along a rail member Rz provided to extend in the Z-axis direction in the YZ orthogonal coordinate system, the stepping motor Ms
The transfer member Fz in the Z-axis direction which is transferred in the Z-axis direction by the drive rotation of z, and is fixed to the transfer member Fz in the Z-axis direction so as to extend in the Y-axis direction in the XYZ orthogonal coordinate system. The transfer member Fyb, which is transferred in the Y-axis direction by the driving rotation of the stepping motor Msy along the provided rail member Ry, is provided with the above-described transfer member Fyb in the Y-axis direction. Therefore, the driving device DRA is provided with the aforementioned X,
Each of the stepping motors Msx, Msyb, Msz in each of the transport members Fx, Fyb, Fz in the Y- and Z-axis directions is rotationally driven according to a drive signal supplied from a computer, so that the transport member Fyb in the Y-axis direction becomes Movement in the vertical direction with the position immediately before the lowermost end Fybe contacting the surface of the convex lens array FEL as the lowermost end, and the position where the transport body Fz in the Z-axis direction reaches the upper end of the rail member Rz as the upper end. Displacement drive to any position in the three-dimensional space on the front surface of the convex lens array FEL of the optical card LAC within a possible range and a range in which the transfer bodies Fx and Fyb can move back and forth and right and left along the rail members Rx and Ry. It can be done. It should be noted that the configuration of the drive device DRA described above and FIG.
Is the same as the configuration of the driving device DRA used in the recording device described later.

In the recording apparatus shown in FIG. 3, the transfer body Fyb in the Y direction is a convex lens array F of the optical card LAC.
In a case where the light is focused at a position separated upward in the space in front of the EL and the focus point PSI serving as the new point light source is positioned above the convex lens array FEL of the optical card LAC, the above-described light collection is performed. The light diverging from the point PSI is converged for each individual convex lens in the convex lens array FEL of the optical card LAC, and is recorded on the recording layer RML provided on the focal plane of the convex lens array FEL for each individual convex lens in the aforementioned convex lens array FEL. Focus point (point light source) P
An SI image is formed and recorded. Further, the transfer body Fyb in the Y direction is a convex lens array FE of the optical card LAC.
When the light-converging point PSI serving as the above-mentioned new point light source is located below the position of the convex lens array FEL of the optical card LAC in the lower position in the space in front of L, ie, the above-described optical system When the convex lens array FEL of the optical card LAC is set closer to the optical system Lo than the position of the light condensing point PSI formed by the light converging action of Lo, the convex lens array FEL of the optical card LAC exists. The light flux converging to a virtual converging point generated in the space if not present is converged for each convex lens in the convex lens array FEL of the optical card LAC, and set on the focal plane of the convex lens array FEL. Convex lens array FEL on the recording layer RML
Are recorded for each individual convex lens in. When the image of the point light source at each of the plurality of positions three-dimensionally displaced in the three-dimensional space is recorded on the recording layer RML, each position of the point light source recorded on the recording layer RML is recorded. Are condensed for each convex lens in the convex lens array FEL of the optical card LAC, and
The real images are respectively connected to the original positions of the point light sources in the three-dimensional space in which the convex lens array FEL exists, and can be perceived as a three-dimensional image.

Next, an optical card LAC comprising a cylindrical convex lens array CLA and a recording layer RML is installed on the machine base MB of the recording apparatus shown in FIG. In the optical card LAC, the above-mentioned cylindrical convex lens array CLA is arranged such that the surface of the recording layer RML provided on the focal plane thereof coincides with the XY plane in the XYZ rectangular coordinate system, and the direction of the cylindrical axis of the cylindrical convex lens. Are provided so as to be parallel to the Y axis in the XYZ rectangular coordinate system. The cylindrical convex lens array CLA has a configuration in which a large number of cylindrical convex lenses are closely aligned on a plane such that their cylindrical axes are parallel to each other, and the lens pitch Is usually made, for example, about 0.1 mm to 0.5 mm, and is formed so as to have a thickness such that the focal plane coincides with the back surface, and the fly-eye lens plate (convex lens array plate) ) Has a structure in which a number of single-lens lenses are arranged in both the vertical direction and the horizontal direction, so that a stereoscopic image can be sensed even when the left and right eyes move in either the horizontal direction or the vertical direction. As described above, the cylindrical convex lens array CLA has a configuration in which a large number of cylindrical convex lenses are aligned on a plane such that their cylindrical axes are parallel to each other. Since there is no lens function in the direction of the cylinder axis, parallax information in the cylinder axis direction cannot be recorded by the cylindrical convex lens array CLA, but the human eyes are arranged right and left. The required minimum stereoscopic effect due to convergence and binocular parallax based on the fact that a stereoscopic effect only in the left and right direction is sufficient, and
In view of the fact that the cylindrical convex lens array CLA is easier to manufacture than the fly-eye lens plate,
An optical card using the cylindrical convex lens array CLA can be easily manufactured as an optical card having a simpler configuration than an optical card using a convex lens array. Information can be recorded.

In the recording apparatus shown in FIG. 4, Fyb is a transfer body that is displaced and driven by an operation of a drive unit DRA described later in a three-dimensional space in front of the cylindrical convex lens array CLA. Is provided with a light source SL and an optical system Lo. The optical system Lo provided on the transfer body Fyb is, for example, a convex lens or a concave mirror, after converging a light beam having a fan-shaped cross section emitted from the light source SL to form a converging point PSI, A configuration having a function of dispersing a light beam from the above-mentioned converging point PSI is used. In FIG. 4, the optical system Lo is configured using a single convex lens as the optical system Lo. However, when the optical system Lo is composed of a convex lens, it is needless to say that a lens composed of a combination of a plurality of lenses may be used. In FIG. 4, a light source SL provided on the transfer body Fyb focuses light emitted from, for example, a laser light source LLS with a cylindrical lens CL, and focuses light from the focus point focused on the cylindrical lens CL. , A light source configured to emit a divergent light beam having a fan-shaped cross section as diverging only in the X-axis direction in the XY plane.
The divergent light beam emitted from L is converged by a convex lens constituting the optical system Lo, and forms an image of the light source SL on the light condensing point PSI. The position of the converging point PSI at which the fan-shaped light beam emitted from the light source SL is converged by the optical system Lo, that is, the light source PSI of the light beam PL diverging in a fan shape only in the X-axis direction is Y In accordance with the driving displacement of the transport body Fyb in the axial direction, the cylindrical convex lens array CL
Although it can be driven to be displaced to any position within a predetermined range in the three-dimensional space where A exists, the above-mentioned converging point PSI is used as a new light source PSI (new light source PSI). Is emitted to the cylindrical convex lens array CLA, and the entire recording apparatus shown in FIG. 4 is used in a state housed in a dark box.

That is, the transfer body Fy in the Y-axis direction described above
b is a driving device DR of the light source SL in the XYZ plotter
A indicates each of the transfer bodies Fx and Fy in the X, Y, and Z axis directions described above.
b, Fz, each stepping motor Ms
The x, Msy, and Msz are rotationally driven in accordance with a drive signal supplied from a computer, so that the transfer body Fyb in the Y-axis direction is driven and displaced in the three-dimensional space where the cylindrical convex lens array CLA exists. It can be displaced and driven to any position within a predetermined range, and the light emission state of the light source PSI is controlled by a computer, so that a predetermined position in the three-dimensional space where the cylindrical convex lens array CLA exists can be obtained. Within the scope of the
The shape of the three-dimensional image is displayed by a continuous linear light locus, or the shape of the three-dimensional image to be recorded is displayed by an array of light spots.

By the way, the cylindrical convex lens array C
Since LA does not have a lens function in the cylindrical axis direction of the cylindrical convex lens (the direction of the Y axis in each figure), even if the cylindrical convex lens array CLA is used, the cylindrical axis direction of the cylindrical convex lens (Y in each figure) Although the parallax information (in the direction of the axis) cannot be recorded on the recording layer RML, the recording apparatus shown in FIG. 4 uses the light source P in the three-dimensional space where the cylindrical convex lens array CLA exists.
The three-dimensional image drawn by the displacement of the SI is converted to an optical card LA.
In order to be able to record a three-dimensional image on the recording layer RML disposed on the focal plane of the cylindrical convex lens array CLA of C, a cylindrical convex lens array disposed so as to have a focal plane on the XY plane The CLA emits a light beam having a cross-sectional shape that does not spread in the cylindrical axis direction (the direction of the Y axis in each drawing) of the cylindrical convex lens that does not exhibit a lens function, but spreads in a fan shape only in the X axis direction. Light source PS
In the three-dimensional space where the cylindrical convex lens array CLA exists, the light source PSI is displaced in accordance with the three-dimensional image to be recorded.
When the light source PSI emits light in the three-dimensional space where the LA exists, the light emitted from the light source PSI converges for each of the cylindrical convex lenses of the cylindrical convex lens array CLA, and the focal point of the cylindrical convex lens array CLA. The image of the light source PSI is recorded on the recording layer RML provided on the surface.

The driving device DR for the light source shown in FIG.
A has the same configuration as that of the light source driving device DRA in the recording apparatus described with reference to FIG. 3, as described above, and each of the transport members Fx and F in the X, Y, and Z axis directions.
Each stepping motor Ms at yb and Fz
When x, Msyb, and Msz are rotationally driven in accordance with a drive signal supplied from a computer, the transfer body Fyb in the Y-axis direction is moved to a position immediately before its lowermost end Fybe comes into contact with the surface of the cylindrical convex lens array CLA. A movable range in the up-down direction with the position where the transport body Fz in the Z-axis direction reaches the upper end of the rail member Rz as the lowermost end, and each transport body Fx, Fyb is a rail member Rx,
The displacement can be driven to any position in the three-dimensional space on the front surface of the cylindrical convex lens array CLA within a range in which the lens can move back and forth and right and left along Ry.

In the recording apparatus shown in FIG.
The transfer body Fyb in the direction is a cylindrical convex lens array C
In a case where the light-converging point PSI serving as a new light source is located above the cylindrical convex lens array CLA of the optical card LAC at a position separated upward in the space in front of the LA as described above, Light diverging from the focused light converging point PSI is applied to the cylindrical convex lens array CLA.
Are focused on each of the cylindrical convex lenses in the above, and an image of a light-convergent point (light source) PSI is formed on each of the cylindrical convex lenses in the cylindrical convex lens array CLA on the recording layer RML provided on the focal plane of the cylindrical convex lens array CLA. Record the image. FIG.
In the recording apparatus shown in FIG.
b is the cylindrical convex lens array C of the optical card LAC
When the light-converging point PSI serving as the new light source is located below the position of the cylindrical convex lens array CLA in a lower position in the space in front of the LA,
That is, the position of the optical card LAC is higher than the position of the converging point PSI formed by the light beam converging action by the optical system Lo.
When the cylindrical convex lens array CLA is disposed near the optical system Lo, focusing on a virtual light condensing point generated at the position of the light condensing point generated in the space when the cylindrical convex lens array CLA does not exist The luminous flux in the operating state is the cylindrical convex lens array CL.
Each of the cylindrical convex lenses in A is recorded on the recording layer RML provided on the focal plane of the cylindrical convex lens array CLA.

The recording apparatus shown in FIG. 4 mechanically changes the spread of the fan-shaped light beam PL diverging only in the X-axis direction emitted from the light source SL and the inclination angle between the XY plane. Luminous flux emitted from the light source PSI, that is, a luminous flux PL diverging only in the X-axis direction and having a fan-shaped cross section and parallel to the XZ plane without employing a mechanism for performing
Is such that a light beam whose thickness in the Y-axis direction is small such as not more than the lens width of one cylindrical convex lens in the cylindrical convex lens array CLA is diverged from the converging point PSI of the optical system Lo. In addition, when the light source PSI is displaced within a predetermined range in the three-dimensional space where the cylindrical convex lens array CLA exists, a linear viewing area to which both eyes should be placed during reproduction, The position information in the Y-axis direction is predetermined so that the surface including the light source PSI is recorded on a portion of the recording layer RML corresponding to the region of the line intersecting with the surface of the cylindrical convex lens array CLA. The three-dimensional image is recorded with the correction made.

Also in the recording apparatus described with reference to FIGS. 3 and 4, the intensity of light emitted from the light source during the erasing operation is compared with the intensity of light from the light source during the recording operation described with reference to FIG. Needless to say, it will be greatly done.

[0037]

As apparent from the above description, the optical card and the recording / reproducing apparatus for the same according to the present invention comprise a first transparent electrode, a photoconductive layer member, and a liquid crystal changed by application of an electric field. A polymer-liquid crystal memory in which liquid crystals having a melting point lower than the melting point of the above-mentioned polymer material are dispersed in the polymer material so that the alignment state of the polymer material is maintained even after the applied electric field is removed. The polymer in the recording layer of the optical card including the recording layer composed of the film and the second transparent electrode includes a polymer layer corresponding to the change in the electric field intensity applied to the liquid crystal memory film. An electric field within the electric field intensity range that can change the transparency of the liquid crystal memory film is applied to the first transparent electrode and the second transparent electrode in the recording layer of the optical card.
In the operating state in the first operation mode generated between the first transparent mode and the transparent electrode of the optical card, light whose intensity is modulated by the information to be recorded is incident from the lens array, and the first transparent layer on the recording layer of the optical card is formed. By generating an electric field whose intensity changes in correspondence with the information to be recorded between the electrode and the second transparent electrode, the information to be recorded is recorded on the recording layer,
In the operation state in the second operation mode in which an electric field is not applied between the first transparent electrode and the second transparent electrode in the recording layer of the optical card, the light is dispersed in the polymer-liquid crystal memory film. At a temperature higher than or equal to the melting point of the liquid crystal and lower than the melting point of the polymer material, light having an intensity capable of heating the liquid crystal is incident on the lens array to return the liquid crystal to an isotropic phase. Since the recorded information can be erased by using the optical card of the present invention, high-speed writing to the optical card is possible, and writing is not possible unless an electric field is applied to the recording layer. Can be erased by strong light without applying an electric field, and high-speed writing and erasing of a three-dimensional image can be easily performed. According to the present invention, the conventional problems described above can be solved well.

[Brief description of the drawings]

FIG. 1 is a vertical side view of an optical card according to the present invention.

FIG. 2 is a block diagram used for describing a recording operation and an erasing operation in the recording apparatus of the optical card of the present invention.

FIG. 3 is a perspective view of a recording device for an optical card according to the present invention.

FIG. 4 is a perspective view of a recording device for an optical card according to the present invention.

FIG. 5 is a perspective view of a conventional example of an optical card.

FIG. 6 is a perspective view of a conventional example of an optical card.

FIG. 7 is a diagram illustrating a state of information recording on a conventional optical card. LAC Optical card FEL Convex lens array CLA Cylindrical convex lens array RML Recording layer BP substrate SW Operation mode setting switch MB Machine base DRA drive PS Point light source Lo Optical system PSI Focus point Msx, Msy, Msz Stepping motor Fx, Fyb, Fz Rx, Ry, Rz Rail member SL light source LLS laser light source CL Cylindrical lens 1 Protective layer 2 Substrate 3 Lower gelatin layer 4 Silver salt pattern layer (crust layer) 5 Lens 7 Matting colored layer 8 Transparent material layer 9, 12 Transparent electrode 10 Polymer-liquid crystal memory film 11 Photoconductive layer member 15 Power supply 19 Light source drive circuit 16 Light intensity control terminal 17 Control signal supply terminal in operation mode setting switch SW 18 Light source

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication location G11B 7/24 501 8721-5D G11B 7/24 572E 572 G06K 19/00 C

Claims (3)

(57) [Claims] 1. A recording system in which a convex lens array in which a plurality of minute convex lenses are two-dimensionally arranged and a recording / reproducing area individually corresponding to each convex lens constituting the convex lens array are formed. An optical card having a component part in which a layer is laminated, wherein the recording layer has a first transparent electrode, a photoconductive layer member, and an alignment state generated by application of an electric field, and the orientation state of the applied electric field is reduced. A polymer-liquid crystal memory film formed by dispersing a liquid crystal having a melting point lower than the melting point of the polymer material in the polymer material so as to be maintained even after the removal, and a second transparent electrode An optical card using a structure including a laminate comprising: 2. A cylindrical convex lens array in which cylindrical convex lenses having a minute width are closely arranged in parallel, and individual recording / reproducing areas individually corresponding to the individual cylindrical convex lenses constituting the cylindrical convex lens array are formed. An optical card having a component portion in which a recording layer to be formed is laminated, wherein the recording layer has a first transparent electrode, a photoconductive layer member, and an alignment state generated by application of an electric field, A polymer-liquid crystal memory film formed by dispersing liquid crystal having a melting point lower than the melting point of the polymer material in the polymer material so as to be maintained even after the applied electric field is removed; An optical card using a structure including a laminate including the transparent electrode. 3. A lens array such as a convex lens array having a two-dimensional array of a plurality of minute convex lenses or a cylindrical convex lens array in which cylindrical convex lenses having a minute width are closely arranged in parallel. And a recording layer in which individual recording / reproducing regions corresponding to the individual convex lenses or individual cylindrical convex lenses are formed. The transparent electrode, the photoconductive layer member, and the melting point of the polymer material described above are lower than the melting point of the polymer material in the polymer material so that the alignment state generated by the application of the electric field is maintained even after the removal of the applied electric field. A liquid crystal device including a laminate composed of a polymer-liquid crystal memory film formed by dispersing liquid crystal having a melting point and a second transparent electrode is used. A recording device for an optical card, wherein the transparency of the polymer-liquid crystal memory film can be changed in response to the change in the electric field intensity applied to the polymer-liquid crystal memory film of the recording layer of the optical card. An operation state in the first operation mode in which an electric field within the electric field intensity range is generated between the first transparent electrode and the second transparent electrode in the recording layer of the optical card; An operation state switching means for switching to an operation state in a second operation mode in which an electric field is not applied between the first transparent electrode and the second transparent electrode in the recording layer; In an operation state in an operation mode, light whose intensity is modulated by information to be recorded is incident from a lens array, and recording is performed between a first transparent electrode and a second transparent electrode in a recording layer of an optical card. The intensity changes according to the target information. To causes an electric field, and means for recording the recording target information on the recording layer of a first transparent electrode in the recording layer of the optical card second
The above-mentioned second electrode in which no electric field is applied to the transparent electrode
In the operating state in the operation mode, the polymer has a strength such that the liquid crystal can be heated to a temperature higher than the melting point of the liquid crystal dispersed in the polymer-liquid crystal memory film and lower than the melting point of the polymer material. Means for irradiating light to the lens array to return the liquid crystal to an isotropic phase to erase the recorded information.