JPH11283034A - Method for recording image, device therefor and device for collating image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a collating time by stopping applying voltage on an unexposure part of a liquid crystal high molecular composite layer before it reaches a threshold value and recording plural images in an different part on the one recording medium. SOLUTION: A reference image is previously recorded in the information recording medium 40 as a form of analog image data, only the image to be referred is written in a liquid crystal display 16, the display 16 and the medium 40 are simultaneously illuminated and a composite image is written in a space optical modulating element SLM 1. The multiple reference images are recorded in the medium 40, the composite image of the multiple reference images with one image to be referred is written in SLM 1 so as to be Fourier-transformed so that a correlative signal is obtained at the time of matching in the multiple reference images. Then, voltage applying is stopped by the time by which the voltage of the liquid crystal-high molecular composite layer in the unexposure part does not reach the threshold value so that the multiple images are recorded in the different part or the same part on one recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording system using a liquid crystal recording medium having a photoreceptor and a liquid crystal-polymer composite layer, and a high speed image coincidence / mismatch between two types of images. The present invention relates to a fingerprint collating system that detects a fingerprint of a room entrant and a fingerprint that matches from a fingerprint list of persons who can enter the room in advance, in combination with an optical computer system that determines the above.

[0002]

2. Description of the Related Art Conventionally, there has been an entry / exit management system for collating a fingerprint or the like by a collation system for determining coincidence / mismatch between two images from a correlation signal obtained by Fourier transform. The collation system writes on a display element such as a liquid crystal display,
Systems for performing an analog Fourier transform using an optical system have already been disclosed in JP-A-6-259562 and JP-A-6-259564.
No. etc. are proposed.

[0003]

However, in the case of image collation using such a method, it takes time to write data on a display element such as a liquid crystal display, and even if a high-speed operation is performed by an optical computer, the effect is reduced. I will. Also, when trying to collate with a large number of reference images, the collation takes a considerable amount of time, making the system impractical.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a collation system having an extremely short collation time by using an information recording medium including a photoconductive layer and a liquid crystal-polymer composite film. And In addition, the present invention
It is an object of the present invention to provide a method for recording a reference image at a high density on a single information recording medium.

[0005]

For this purpose, the present invention provides a photoconductor in which a photoconductive layer is laminated on an electrode formed on a support, and a liquid crystal-polymer composite layer formed on the electrode formed on the support. The liquid crystal recording medium having the above is disposed facing the air gap, or the photoconductive layer, the dielectric intermediate layer, the liquid crystal-polymer composite layer, and the electrode layer are laminated in this order on the electrode formed on the support. Using a recorded information recording medium, the photoconductive layer is exposed to an image, and a voltage is applied between both electrodes to align the liquid crystal and record an image. By stopping the application of the voltage at a time when the voltage does not reach the threshold voltage, a plurality of images are recorded on different portions or the same portion of one recording medium. Further, the present invention provides a device for recording an image on a liquid crystal layer by voltage application exposure, wherein a means for monitoring a change in transmittance of an exposed portion, and a voltage application is stopped at a timing when the transmittance of the exposed portion becomes a predetermined value or more. And means for performing the operation.

Further, the present invention provides a photoreceptor in which a photoconductive layer is laminated on an electrode formed on a support, and a liquid crystal recording medium having a liquid crystal-polymer composite gas phase on the electrode formed on the support. Or an information recording medium in which a photoconductive layer, a dielectric intermediate layer, a liquid crystal-polymer composite layer, and an electrode layer are laminated in this order on an electrode formed on a support, or An image recording medium on which an image is recorded by aligning the liquid crystal by applying an image to the photoconductive layer and applying a voltage between the two electrodes, and a transmission type display for writing image data captured by the first CCD sensor. A first spatial light modulating element written with transmitted light when the information recording medium and the transmissive display are illuminated, and a first spatial light modulating element for performing Fourier transform on the read light modulated by the first spatial light modulating element.
Optical system, a second spatial light modulator to which a Fourier transform image from the first optical system is written, and a second spatial light modulator for further performing Fourier transform on the readout light modulated by the second spatial light modulator.
, And a second CCD sensor for detecting a correlation signal obtained from the second optical system, and an image recorded on an information recording medium by the correlation signal and captured by the first CCD sensor. It is characterized in that it is determined whether the image matches or not.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the configuration of an information recording medium used in the image reference system of the present invention. FIG.
1A shows a separation type information recording medium in which a photoreceptor 1 and a liquid crystal recording medium 2 are arranged to face each other with a spacer 3 interposed therebetween, and FIG. 1B shows the photoreceptor 1 and the liquid crystal recording medium 2 with a dielectric layer 4 interposed therebetween. 1 shows an integrated information recording medium that is stacked by stacking. The photoreceptor 1 has a layer structure in which an electrode layer 1b and a photoconductive layer 1c are sequentially laminated on a substrate 1a, and the liquid crystal recording medium 2 includes an electrode layer 2b,
It has a layer structure in which the liquid crystal-polymer composite layer 2c is sequentially laminated. In the case of the separation type, the liquid crystal recording medium side is also the substrate 2
a.

FIG. 2 shows an image recording method using the information recording medium of the present invention. As shown in the drawing, the photoconductive layer of the information recording medium described in FIG. 1 is image-exposed through an imaging lens 6, and a voltage is applied between a photoconductor of the information recording medium and an electrode of the liquid crystal recording medium by a power supply 7, The resistance of the photoconductive layer in the light-irradiated portion is reduced, an extra voltage is applied to the liquid crystal recording layer, the liquid crystal in that portion is oriented, and light is transmitted, so that an image is recorded. The liquid crystal recording layer has a memory property, maintains an alignment state even after the electric field is removed, and can retain recorded image information for a long time.

Next, an image reference system in which a human fingerprint is recorded as a reference image on the information recording medium and the fingerprint is collated using an optical computer will be described. First, a conventional image (fingerprint) reference system is shown in FIG.
This will be described with reference to FIG. As reference images, fingerprint images of many persons captured by the CCD sensor are stored as digital data in a memory in the image memory system 15. The to-be-referenced image is captured by placing a finger on the prism 11, illuminating the light with the light source 10, and forming the reflected light on the CCD camera 13 with the imaging lens 12. The image thus captured is subjected to image processing by the image processing device 14, and is displayed as a composite image on a transmissive display element 16 such as a liquid crystal display along with a reference image read from an image memory system 15 and stored in advance as digital data. And
The transmitted image is illuminated by the laser 17 and the transmitted image is changed to the spatial light modulator SLM1.
Write on top. The reading of the spatial light modulator SLM1 is performed as follows.
Half mirror 1 using light from laser 18 as read light
This is performed by illuminating the spatial light modulator SLM1 through the light emitting elements 9 and 20. The read-out light modulated by the synthesized image written in the SLM 1 is Fourier-transformed by the Fourier lens 21, and a synthesized Fourier image is written on the spatial light modulator SLM2. The read light illuminated through the half mirrors 22 and 23 and modulated by the SLM 2 is further Fourier transformed by the Fourier lens 24, and the correlation image is converted to the light receiving element 2.
5 is input.

As shown in FIG. 4, a composite image 32 is obtained from a registered fingerprint image 30 and a fingerprint image 31 to be collated. If the two images are equal, when a composite Fourier image is read, a correlation signal 33 is generated. By detecting with the element, it is possible to determine the match / mismatch of the images.

However, in such a collation system, it takes time to write the reference image on the liquid crystal display,
In order to find a matching fingerprint from a large number of reference images, it takes a long time to perform matching by writing time to the display × the number of reference images, which is not practical. Therefore, in the present invention,
As shown in FIG. 5, the reference image is recorded in advance in the form of analog image data on the information recording medium 40, and only the read reference image is written on the liquid crystal display 16, and the liquid crystal display 16 and the information recording medium 40 are simultaneously read. The combined image is written on the SLM 1 by illumination. As shown in FIG. 5B, a large number of reference images are recorded on the information recording medium 40, and are written at once into a composite image SLM1 of a large number of reference images and one image to be referenced, and this is written as a Fourier image. By performing the conversion, a correlation signal can be obtained if there is a match among many reference images. In this way, it is not necessary to write many reference images to the liquid crystal display, and it is possible to refer to many images in a very short time.

As such an image recording medium, it is necessary to record an image by a simple method, and it is necessary to record at a high density. Such an information recording medium is formed on an electrode as described with reference to FIG. An information recording medium comprising a photoreceptor having a photoconductive layer formed thereon and a liquid crystal recording medium having a liquid crystal-polymer composite film on an electrode can be used.

The liquid crystal display used in the system shown in FIG. 3 has a limited number of pixels and cannot display a large amount of image information at one time. Since the images are recorded, a plurality of images can be processed in parallel using a relatively compact optical system. As described above, since the optical computer can perform a plurality of processes in parallel, there is an advantage that the processing speed increases accordingly. In addition, the information recording medium can multiplex-record a plurality of images on the same portion of the recording medium, and can simultaneously process the multiplex-recorded images, which can also increase the speed. It is. In the case of fingerprint collation, there is no problem if an image that is multiplexed and recorded at the same position is used as a reference image, since it is only necessary that there is an image that matches any of the characteristics.

Next, a method for recording an image on such an information recording medium at a high density will be described. FIG. 6 shows the relationship between the voltage applied to the liquid crystal recording layer and the transmittance when a voltage is applied to the liquid crystal recording layer in a slope. As shown, the liquid crystal recording layer used in the information recording method of the present invention has a relatively high threshold voltage and does not operate at all below the threshold voltage.
When the threshold value is exceeded, the liquid crystal is oriented, and the transmittance tends to increase rapidly.

Next, the photocurrent characteristics of the photoconductor will be described. FIG. 7 shows a method for measuring the photocurrent of the photoconductor. As shown in the figure, a voltage is applied to the measuring cell formed by forming an electrode 45 on the photoconductive layer of the photoconductor 1 using a pulse generator 43 and a high-voltage amplifier (indicated as a power supply 44 in the figure), The value of the current flowing through the measuring resistor 46 is measured. Further, light irradiation is performed by the light source 41 and the electromagnetic shutter 42 for an arbitrary time, and the photocurrent characteristics are measured.

FIG. 8 shows an example of the measurement results. The measurement conditions are: exposure condition: 10 μW (560 nm), 15 msec, and voltage application condition: 200 V. As shown in the figure, even when light is not irradiated, a predetermined current flows (dark current). By irradiating light, the current value increases during light irradiation, and an image is formed by a difference from the dark current value (light-induced current). Can be recorded. Also, the photo-induced current does not become zero immediately after the end of light irradiation,
Decays slowly over a sufficiently long time.

Next, the recording principle will be described using an equivalent circuit model of the information recording medium. FIG. 9 shows an equivalent circuit of the system. The figure shows a configuration in which the photoconductor and the liquid crystal-polymer composite layer are directly laminated for convenience of explanation, and it can be considered in a similar manner that a photoconductor and a liquid crystal-polymer composite layer are disposed via a dielectric intermediate layer or have an air gap. . As shown, the photoconductor and the liquid crystal recording medium are each considered to be a parallel circuit of a resistor and a capacitor. FIG. 10 shows a result of simulating a voltage change applied to the liquid crystal recording layer using such an equivalent circuit. The characteristic A is the voltage of the portion irradiated with light, and the characteristic B is the voltage of the portion not irradiated with light. At the beginning of the voltage application, the voltage is distributed to the ratio of the capacitance of the photoconductor to the capacitance of the liquid crystal layer. Thereafter, the voltage of the liquid crystal layer increases due to the current component of the photoconductor. Since the photoconductor at the portion irradiated with light causes an extra current to flow, an extra voltage is applied to the liquid crystal layer as compared with the portion not irradiated. As described above, the liquid crystal layer has a threshold voltage (200
No response occurs below V), and the liquid crystal starts to change above the threshold voltage, so that the liquid crystal layer in the light-irradiated portion starts to be oriented faster than the portion not irradiated with light, and the transmittance increases. In this way, an appropriate time (40 as indicated by the arrow in the figure) is obtained.
By stopping the voltage application at msec or less), the alignment state of the liquid crystal is fixed in that state, so that an image can be recorded as a difference in transmittance.

Next, a method for recording a fingerprint image using the information recording medium will be described. FIG. 11 shows a method of recording a fingerprint using a prism.
When light is irradiated at a predetermined angle from the glass surface while the finger is pressed against 1, the light transmitted through the glass is absorbed by the skin because the convex portion of the fingerprint is in contact with the glass, and the reflected light is weakened. Since the concave portion of the fingerprint is totally reflected at the interface between glass and air, reflected light with high contrast can be obtained. A fingerprint image can be captured by adjusting the optical system so that the reflected light forms an image on the photoconductive layer of the information recording medium. The fingerprint image captured in this way is
This is an off binary image.

Next, a method for recording a large number of images at high density will be described. Normally, when a large number of images are recorded on one information recording medium, it is usual to pattern the electrodes in accordance with the shape to be recorded. However, in such a method, a space is formed between the electrodes. By providing
As a whole, the recording density is reduced, and it is necessary to take out the electrode of the portion to be recorded alone. Therefore, when the number of recordings increases, the wiring becomes complicated, and there is a problem that it becomes difficult to take out the electrode. In order to record a large number of pieces of image information on one recording medium without dividing the electrodes, the voltage (characteristic B in FIG. 10) of a portion not irradiated with light is a threshold voltage (200 V).
The applied voltage may be stopped at the time when the voltage does not reach. If recording is performed under such conditions, when a certain image is recorded and then when the next image is recorded, if the portion where the image is already recorded is not exposed to light, the liquid crystal layer in this portion is completely eliminated. It does not change. As a setting method of such a voltage application condition, as shown in FIG. 12, monitor means (measurement electrode 45, measurement resistance 46) for measuring the dark current value of the photoreceptor is provided to measure the dark current. , The light source is turned off), and the time required for the liquid crystal layer to reach the threshold voltage can be calculated based on the measured dark current value. At this time, if the exposure amount in the light-irradiated portion is sufficiently large, the liquid crystal layer in the exposed portion is sufficiently oriented, so that a fingerprint image can be reliably recorded.

However, if the exposure amount is sufficiently large and the potential difference between the light-irradiated portion and the non-irradiated portion is too large, a large electric field is applied in the direction of the film surface of the photoconductive layer, and a current flows in the film surface direction. Will deteriorate. In order to prevent such degradation in resolution, it is necessary to minimize the amount of exposure, but in this case, unless the voltage application conditions are strict, the liquid crystal in the non-light-irradiated portion will be oriented or the contrast will be low. Problem. Figure 1 shows this point.
3, when image recording is performed under different exposure conditions of a, b, and c, when the voltage of the light-irradiated portion reaches a voltage (250 V) at which the liquid crystal medium is completely aligned, when the voltage application is stopped, Each voltage application time is about 20
msec, 35 msec, and 55 msec. At this time, if the exposure amount is too large as in the condition a, the potential difference between light and dark is too large, a large electric field is applied in the direction of the film surface of the photoconductive layer, and current flows in the direction of the film surface, causing deterioration in resolution. . On the other hand, if the exposure amount is too small as in the condition c, the voltage of the dark portion is already higher than the threshold voltage, so that the contrast becomes low and the image data recorded before that is affected. Will have an effect. Therefore, it is necessary to record at the exposure amount as in the condition b.

A method for solving such a problem will be described. First, in order to collate a fingerprint image, it is necessary to record the fingerprint image with as large a contrast as possible. FIG. 14 shows a schematic diagram of the apparatus for explanation. The writing light for image recording is divided into two parts, one of them is irradiated on a fingerprint to be captured, the reflected light forms an image on the photoconductive layer of the information recording medium, and the other is totally reflected to separate the information recording medium. The optical system is adjusted so as to form an image on the portion. The transmitted light of the totally reflected light is measured by using the photoelectric conversion element 50 as shown in the figure, and the applied voltage is stopped when the measured value approaches a value corresponding to when the liquid crystal is completely aligned. If the voltage is further applied, the liquid crystal is already fully aligned, so the contrast cannot be increased.If the applied voltage is stopped earlier than this, the alignment of the liquid crystal is incomplete, Large contrast cannot be obtained. When the voltage application time is adjusted by such a method, if the exposure conditions are inappropriate, for example, if the exposure amount is insufficient, the liquid crystal layer in the dark part is higher than the threshold voltage, so that a large contrast is obtained. Is not obtained, and the image data portion recorded before that is unfavorably affected. On the other hand, if the exposure amount is too large, the potential difference between the bright part and the dark part is large as described above, which causes a deterioration in resolution.

The appropriate exposure can be estimated from the difference in the surface charge of the liquid crystal layer between the unaligned state and the aligned state, and this value can be measured in advance, and this value can be used. The surface charge amount of the liquid crystal layer can be estimated from the capacitance of the liquid crystal layer and the voltage at that time. Liquid crystals have anisotropy in dielectric constant, and when the liquid crystals are oriented, the capacitance increases according to the orientation state. The following table shows the results of measuring the capacitance and surface charge of the liquid crystal recording layer.

[0023] According to this table, the difference between the charge densities of the liquid crystal layer in the aligned state and the liquid crystal layer in the unaligned state is 1.7 × 10 ⁻⁷ coulomb (C) / cm ² . become. This value varies slightly depending on the composition of the liquid crystal-polymer composite film and the preparation conditions, but shows almost the same value. Also,
With respect to the change in the thickness of the liquid crystal layer, since the capacitance is inversely proportional to the thickness and the drive voltage is proportional to the thickness, the value of the required charge density does not change much. Expressing the above by an equation, the threshold voltage at which the liquid crystal starts to be aligned is V _th , the voltage when the liquid crystal is completely aligned is V _sa , and the capacitance when the liquid crystal is not aligned is C th. _d, the liquid crystal is completely oriented capacitance C _L when the bright portion through the photoreceptor, when the dark portion of the measured current value was set to _{I L, I d, ∫ (} I L -I d) dt ≧ ( V _sa −V _th ) · (C _sa −
Image exposure may be performed under exposure conditions that _satisfy C _th ). The left side of this equation is the amount of charge generated by exposure, and the right side is the difference between the amount of charge in the bright and dark portions of the liquid crystal.

Next, adjustment of exposure conditions will be described with reference to FIG. Adjustment of the exposure conditions, the light-induced current value when irradiating light under appropriate exposure conditions is measured, and since the light-induced current value is proportional to the exposure amount, the light-induced current value is set to be equal to or more than the above value. What is necessary is just to set the exposure amount. Regarding the voltage application condition at this time, the photo-induced current depends on the applied voltage, but it is difficult to measure under the same voltage application condition since the voltage applied to the photoconductor changes every moment. For this reason, it is possible to approximately measure by simply using a value obtained by averaging the voltages applied to the photoconductors at the initial time of the applied voltage and at the end of the voltage application as the measured voltage. That is, the measured voltage Ve
x is obtained by the following equation. V _ex = ｛C _LC / (C _LC + C _OPC ) · V _APP + (V _APP −
V _sa )｝ / 2, where C _{LC is the} capacitance of the liquid crystal layer, C _OPC is the capacitance of the photosensitive member, V _{APP is the} applied voltage, and V _sa is the saturation voltage of the liquid crystal layer.
Note that C _LC / (C _LC + C _OPC ) · V _APP is the voltage at the beginning of the voltage application, and (V _APP −V _sa ) is the voltage at the time of stopping the voltage application.

The measurement time is preferably about 50 msec. If the measurement time is too long or too short, an image cannot be recorded well. Further, as the exposure condition, it is necessary that a photo-induced current of at least the above value is obtained, and if it is less than that value, the liquid crystal in a portion not irradiated with light is oriented, so that a plurality of images are recorded. It becomes a problem when you do. When the exposure amount is larger than the predetermined value, the problem is not so large.However, when the exposure amount is too large and the photo-induced current is excessively generated, there is a problem that the potential difference between light and dark becomes too large and the resolution is deteriorated. Must be an appropriate value. In the present invention, the difference between the current value of the exposed portion and the current value of the unexposed portion of the photoconductive layer is 1 × 10 ⁻⁷ during the time from the start of the voltage application when a voltage of 100 V is applied to the photoconductor to 50 msec.
A favorable result can be obtained by performing image exposure under exposure conditions such that the range is C / cm ² to 1 × 10 ⁻⁶ C / cm ² .

Multiple recording of images in the same location on the same recording medium can be performed in the same manner as described above.
The image recorded by such a method is an on / off image, and since the liquid crystal other than the image portion has not changed at all, the next image can be recorded in this portion. Since fingerprint matching is feature matching, even if there is a portion where a plurality of images intersect, it does not affect the matching. By performing the multiplex recording in this manner, a plurality of images can be recorded at a high density and the operations can be performed in parallel, so that the processing can be performed at high speed.

[0027]

As described above, according to the present invention, a large number of reference images are recorded in advance on an information recording medium in the form of analog image data, and only the read reference image is written on the liquid crystal display. And the information recording medium are simultaneously illuminated, and a composite image of many reference images and one reference image at a time is written into the spatial light modulation tube, and this is subjected to Fourier transform. It is possible to refer to a large number of images in a very short time without writing time to the display.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an information recording medium used in an image reference system of the present invention.

FIG. 2 is a diagram illustrating an image recording method using the information recording medium of the present invention.

FIG. 3 is a configuration diagram of a conventional image (fingerprint) collation system.

FIG. 4 is a diagram illustrating reference to an image (fingerprint).

FIG. 5 is a configuration diagram of an image (fingerprint) collation system of the present invention.

FIG. 6 is a diagram showing the relationship between the voltage applied to the liquid crystal recording layer and the transmittance when a voltage is applied to the liquid crystal recording layer in a slope.

FIG. 7 is a diagram illustrating a method of measuring a photocurrent of a photoconductor.

FIG. 8 is a diagram showing a measurement result of a current flowing through a photoconductor.

FIG. 9 is a diagram showing an equivalent circuit of the recording medium of the present invention.

FIG. 10 is a diagram showing a result of simulating a voltage change applied to a liquid crystal recording layer using an equivalent circuit.

FIG. 11 is a diagram illustrating a method of recording a fingerprint using a prism.

FIG. 12 is a diagram illustrating an example in which a monitor unit that measures a dark current value of a photoconductor is provided.

FIG. 13 is a diagram illustrating a method of recording a fingerprint image by controlling the voltage application time by monitoring the transmittance.

FIG. 14 is a schematic diagram of an apparatus for recording a fingerprint image with high contrast.

FIG. 15 is a diagram illustrating measurement conditions of a photoconductor for determining exposure conditions.

[Explanation of symbols]

10 light source, 11 prism, 12 imaging lens, 13
... CCD camera, 14 ... Image processing device, 15 ... Image memory system, 16 ... Transmissive display element, 17,18 ... Laser, 19,20,22,23 ... Half mirror, 21,22
4 Fourier lens, 25 Photodetector, 30 Registered fingerprint image, 31 Fingerprint image to be compared, 32 Composite image, 33
Correlation signal, 40 ... information recording medium.

Claims (14)

[Claims] 1. A photoconductor in which a photoconductive layer is laminated on an electrode formed on a support, and a liquid crystal is formed on an electrode formed on the support.
A liquid crystal recording medium having a polymer composite layer is disposed opposite to an air gap, or a photoconductive layer, a dielectric intermediate layer, a liquid crystal-polymer composite layer on an electrode formed on a support, and In a method of performing image exposure on the photoconductive layer using an information recording medium laminated in the order of the electrode layers and applying a voltage between both electrodes to orient the liquid crystal and record an image, an unexposed portion of the liquid crystal-high By stopping the voltage application at the time when the voltage of the molecular composite layer does not reach the threshold voltage,
An image recording method characterized by recording a plurality of images on different portions of one recording medium. 2. A photoconductor in which a photoconductive layer is laminated on an electrode formed on a support, and a liquid crystal is formed on an electrode formed on the support.
A liquid crystal recording medium having a polymer composite layer is disposed opposite to an air gap, or a photoconductive layer, a dielectric intermediate layer, a liquid crystal-polymer composite layer on an electrode formed on a support, and An image is exposed to a photoconductive layer using an information recording medium laminated in the order of electrode layers, and a voltage is applied between both electrodes to align the liquid crystal and record an image. By stopping the applied voltage at a time when the voltage of the composite layer does not reach the threshold voltage,
An image recording method characterized by recording a plurality of pieces of image information on the same portion of one recording medium. 3. The image recording method according to claim 1, wherein the voltage application is stopped at a timing when the transmittance of the liquid crystal-polymer recording layer at the exposed portion becomes a predetermined value or more. Method. 4. The image recording method according to claim 1, wherein an exposure portion of the photoconductive layer is provided in a time period from a start of voltage application when a voltage of 100 V is applied to the photoreceptor to 50 msec. The difference between the current values of the unexposed portions is 1 × 1
An image recording method, comprising exposing an image under an exposure condition such that it is in a range of 0 ^-7 C / cm ² to 1 × 10 ^-6 C / cm ² . 5. The image recording method according to claim 1, wherein a threshold voltage at which the liquid crystal starts to be aligned is V _th , and a voltage when the liquid crystal is completely aligned is V _sa .
The capacitance when the liquid crystal is not aligned is C _d , the capacitance when the liquid crystal is completely aligned is C _L , and the measured current values of the bright and dark portions flowing through the photoreceptor are I _L and I _d . _{when, ∫ (I L -I d)} dt ≧ (V sa -V th) · (C sa -
An image recording method, wherein image exposure is performed under exposure conditions that _satisfy C _th ). 6. The image recording method according to claim 1, wherein the image exposure of the photoconductive layer is performed through a prism. 7. An image recording apparatus used in the image recording method according to claim 1, wherein said means for monitoring a change in transmittance of an exposed portion, and wherein the transmittance of said exposed portion is a predetermined value. Means for stopping voltage application at a timing when the voltage becomes equal to or more than the value. 8. A photoconductor in which a photoconductive layer is laminated on an electrode formed on a support, and a liquid crystal is formed on an electrode formed on the support.
A liquid crystal recording medium having a polymer composite phase is disposed opposite to an air gap, or a photoconductive layer, a dielectric intermediate layer, a liquid crystal-polymer composite layer on an electrode formed on a support, and Using an information recording medium laminated in the order of the electrode layers, the photoconductive layer is exposed to an image, and a voltage is applied between both electrodes to align the liquid crystal and record the image. A transmissive display for writing the captured image data, a first spatial light modulator written with transmitted light when the information recording medium and the transmissive display are illuminated, and a read modulated by the first spatial light modulator A first optical system for Fourier transforming light, and a second optical system for writing a Fourier transform image from the first optical system.
, A second optical system that further Fourier-transforms the read light modulated by the second spatial light modulator, and a second C that detects a correlation signal obtained from the second optical system.
An image collating apparatus, comprising: a CD sensor; and determining whether the image recorded on the information recording medium by the correlation signal matches an image captured by the first CCD sensor. 9. The information recording medium according to claim 8, wherein the applied voltage is stopped by a time during which the voltage of the liquid crystal-polymer composite layer in the unexposed portion does not reach the threshold voltage. An image matching device, wherein a plurality of pieces of image information are recorded on different portions of one recording medium. 10. The information recording medium according to claim 8, wherein the applied voltage is stopped during a time when the voltage of the liquid crystal-polymer composite layer in the unexposed portion does not reach the threshold voltage. An image matching apparatus, wherein a plurality of pieces of image information are recorded in the same portion of one recording medium. 11. The information recording medium according to claim 8, wherein a voltage is applied to the information recording medium at a timing when the transmittance of the liquid crystal-polymer recording layer in an exposed portion becomes equal to or higher than a predetermined value. An image collating apparatus, wherein the image information is recorded after stopping the operation. 12. The apparatus according to claim 8, wherein the information recording medium is a photoconductor.
50 msec from the start of voltage application when 0 V voltage is applied
Under the exposure conditions such that the difference between the current value of the exposed portion of the photoconductive layer and the current value of the unexposed portion is in the range of 1 × 10 ⁻⁷ C / cm ² to 1 × 10 ⁻⁶ C / cm ² An image collating device, which is subjected to image exposure. 13. The information recording medium according to claim 8, wherein the information recording medium has a threshold voltage at which the liquid crystal starts to be oriented at V _th , and a voltage at which the liquid crystal is completely oriented. Is V _sa , the capacitance when the liquid crystal is not aligned is C _d , the capacitance when the liquid crystal is completely aligned is C _L , and the measured current values of the light and dark portions flowing through the photoreceptor are I _L , when the _{I d, ∫ (I L -I} d) dt ≧ (V sa -V th) · (C sa -
An image collating apparatus, wherein an image is exposed under an exposure condition of C _th ). 14. An apparatus according to claim 8, wherein the information recording medium is configured to perform image exposure of a photoconductive layer through a prism.