JPH07114039A - Spatial light modulator - Google Patents

Abstract

PURPOSE:To provide the photoelectric conductor layer of the spatial light modulator which enables image reading with a high resolution, has sufficient heat resistance, is capable of shortening production time and reducing production costs and is easily formable to a larger area. CONSTITUTION:This spatial light modulator includes the photoelectric conductor layer 14 formed with the charge image corresponding to an input optical image and an optical modulator layer 17 to be subjected to optical modulation corresponding to the charge image and has a function to read out optically written information as optical information. The photoelectric conductor layer of the spatial light modulator is an org. photosensitive body of a single layer contg. a phthalocyanine and high polymer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-to-light information conversion processing element, and more particularly to a spatial light modulator most suitable for analog processing and display of moving and still images.

[0002]

2. Description of the Related Art In recent years, as a spatial light modulator, there has been a method of modulating read-out light by once converting light input information into a charge image and applying an electric field corresponding to the charge image to a liquid crystal layer. Is being considered.

This element is attracting attention as an element that effectively uses the parallelism of light for information processing, and some of them have reached the practical level and are being developed.

First, the principle of a spatial light modulator using such a liquid crystal will be described. FIG. 1 shows the basic structure of a liquid crystal spatial light modulator and its principle.

In FIG. 1, 11 and 20 are antireflection films provided as needed, 12 and 19 are a pair of glass substrates,
Reference numerals 13 and 18 denote a pair of transparent electrodes, and 17 denotes a liquid crystal layer sandwiched between the reflection mirror 15 and the transparent electrode 18. The liquid crystal layer 17 is generally a polymer dispersion type liquid crystal, a nematic liquid crystal, a smectic liquid crystal, a ferroelectric liquid crystal or the like. Is used.

The liquid crystal layer 17 is provided with a light shielding layer 16 between the reflection mirror 15 and the liquid crystal layer 17, if necessary.

A power source 21 for driving the liquid crystal layer 17 is connected between the transparent electrodes 13 and 18.

Further, between the reflection mirror 15 and the transparent electrode 13, a photoconductive layer 14 for converting optical information into a charge image.
Is provided.

In the spatial light modulator having such a structure,
The information writing light 22 is input to the photoconductive layer 14 from the glass substrate 12 side, and the resistance value of the light irradiated portion of the photoconductive layer 14 changes, so that the resistance value between the transparent electrodes 13 and 18 changes. Change.

Therefore, an electric field corresponding to the changed resistance value is applied to the liquid crystal molecules of the liquid crystal layer 17, and the orientation of the liquid crystal molecules of the liquid crystal layer 17 is modulated by the applied electric field. Become.

On the other hand, the read light 23 is input from the liquid crystal layer 17 side and reflected by the reflection mirror 15. The reflected light 24 is modulated by passing through the liquid crystal layer 17.

The conditions required for such a photoconductive layer 14 are (1) 16.6 msec or more so that the response speed to light matches a signal of 60 Hz, and (2)
The change in voltage with respect to light is analog, (3)
In order for the voltage to be effectively applied to the liquid crystal layer, the capacitance value of the photoconductive layer is appropriate (that is, its dielectric constant or the thickness of the dielectric layer is appropriate), and (4) charge retention Therefore, the resistance is mainly about 10 ¹⁰ to 10 ¹² Ωcm, and (5) it has sufficient heat resistance.

A relationship of dL / εL << dp / εp must be established between the dielectric constant of the photoconductive layer 14 and the dielectric constant of the liquid crystal layer 17 (where dL is the thickness of the liquid crystal layer, εL). Is the dielectric constant of the liquid crystal layer, dp is the thickness of the photoconductive layer, εp is the dielectric constant of the photoconductive layer, and the ratio of dL / εL: dp / εp is required to be 1: 6 or more).

Assuming that the dielectric constant of the photoconductive layer 14 is 3 as predicted from the dielectric constant and the thickness of the general liquid crystal layer 17, the photoconductive layer 14 having a thickness of 10 to 15 μm is not formed. must not.

As a material of the photoconductive layer 14 for converting the input light information into a charge image, a material using BSO crystal, a material using hydrogenated amorphous silicon, and a material using a laminated organic photoconductor are mainly proposed. Has been done.

[0016]

However, the BSO crystal requires high-precision polishing in the element manufacturing process, and
There is a disadvantage that it is difficult to increase the area and the manufacturing cost becomes high.

Further, in the hydrogenated amorphous silicon film, 10 μm is necessary for applying a necessary electric field to the liquid crystal layer.
Since the above film thickness is required, it takes a long manufacturing time, and since the volume resistivity is 10 ¹⁰ Ωcm, the generated carriers are not sufficiently retained, resulting in a decrease in resolution. was there.

Further, the laminated organic photoconductor has a problem of complicated manufacturing process due to lamination and heat resistance, so that it cannot be practically used for a spatial light modulator.

[0019]

The present invention has been realized in order to solve the technical problems of the photoconductive layer for a spatial light modulator as described above.

Therefore, according to the present invention, (1) the manufacturing time can be shortened and the manufacturing cost can be reduced.
(2) Capable of reading out high-resolution images (that is, having sufficient charge retention ability), (3) Obtaining sufficient heat resistance, (4) Spatial light modulation capable of easily increasing the area. The purpose is to realize a container.

[0021]

In the present invention, a single-layer organic photoconductor consisting of phthalocyanine and a polymer is used to form a photoconductive layer which is easy to manufacture, has sufficient sensitivity and resolution, and is also excellent in heat resistance. Can be done.

[0022]

Embodiments of the spatial light modulator of the present invention will be described below.

The spatial light modulator according to the present invention is similar in principle to the configuration shown in FIG. 1, and therefore FIG. 1 will be referred to.

In this embodiment, a liquid crystal is also used as the light modulation layer, and the transmittance changes according to the intensity distribution of the applied electric field.

For the liquid crystal layer 17, polymer dispersion type liquid crystal, nematic liquid crystal, smectic liquid crystal, ferroelectric liquid crystal and the like can be used, but polymer dispersion type liquid crystal was used.

The liquid crystal layer 17 is sandwiched between a transparent electrode 11 made of ITO (indium tin oxide) and a reflection mirror 13.

As the dielectric mirror which is the reflection mirror 15, an alternating laminated film of TiO ₂ and SiO ₂ was used.

Further, the light shielding layer 16 is made of Si or CdT.
A vapor deposition film selected from e, Ge, B and the like was provided.

The inventor of the present invention examined various photoconductors which are characteristic of the present invention. First, a single-layer organic photoconductor composed of phthalocyanine and a polymer was used as a photoconductor layer of a spatial light modulator. It was found that the above problems can be effectively solved by the above, and a photoconductor layer on which a charge image corresponding to an incident optical image is formed, and a light modulator layer (liquid crystal layer) on which light modulation corresponding to this charge image is performed. And a spatial light modulator using a single-layer organic photoreceptor composed of phthalocyanine and a polymer as a photoconductor layer.

Further, in the present invention, a part of the phthalocyanine is at least X-type metal-free phthalocyanine (hereinafter referred to as X
Type phthalocyanine) or τ type metal-free phthalocyanine (hereinafter referred to as τ type phthalocyanine).

Further, the photoconductor layer contains a binder polymer,
It is characterized in that it is composed of phthalocyanine molecularly dispersed in a binder polymer and X-type phthalocyanine or τ-type phthalocyanine dispersed in the form of particles.

Because X-type phthalocyanine or τ
A single-layer type photoconductor comprising a phthalocyanine type and a combination thereof with a suitable binder polymer is a positive charging type, but it has a remarkably high sensitivity in the first place.
It was based on the finding that it exhibits excellent sensitivity to light having a wide wavelength range of 00 nm.

Further, the above-mentioned phthalocyanine is characterized in that it contains phthalocyanine which is obtained by treating both X-type phthalocyanine and a solvent which dissolves it to change the crystal system of at least a part thereof.

Here, the molecular dispersion method and the crystal system changing method will be described. First, the molecular dispersion method will be described.

In order to solve the above-mentioned problems, the inventor of the present application examined single-layer organic photoconductors having various structures.

The single-layer type organic photoconductor does not require the two layers of the charge generating agent (CGM) and the charge transporting agent (CTM) unlike the conventional two-layer type organic photoconductor, but this is The added X-type or τ-type phthalocyanine has two capabilities of charge generation and transfer.

As a result of further examination on this point,
Such charge transfer ability is generated by X-type or τ-type phthalocyanine molecularly dispersed in the binder polymer, and charge generation ability is X-type or τ-type dispersed in the binder polymer. Clarified that it is caused by type phthalocyanine.

Therefore, it is necessary that two kinds of X-type or τ-type phthalocyanine which are molecularly dispersed and particulately dispersed are present in the single layer.

In order to realize such a state of molecular dispersion, at least a part of X-type or τ-type phthalocyanine is dissolved in a suitable solvent, and a polymer which is soluble in this solvent is used as a binder. Have to choose as.

Solvents suitable for such purposes include nitrobenzene, chlorobenzene, dichlorobenzene, dichloromethane, trichloroethylene, chloronaphthalene, methylnaphthalene, benzene, toluene, xylene, tetrahydrofuran, cyclohexanone, 1.4-
Dioxane, N-methylpyrrolidone, carbon tetrachloride, brombutane, ethylene glycol, sulfolane, ethylene glycol monobutyl ether, acetoxyethoxyethane, pyridine and the like can be used.

On the other hand, solvents such as cyclohexane, petroleum ether, nitromethane, methoxyethanol, acetonitrile, dimethylsulfoxide, ethyl acetate, isopropyl alcohol, diethyl ether, methyl ethyl ketone, ethanol, hexane, propylene carbonate and water are X type or τ type. Does not dissolve phthalocyanine.

Therefore, although these solvents cannot be used alone in the present invention, when these solvents are used, they are used in combination with a solvent that dissolves the previously fried X-type or τ-type phthalocyanine. There is a need.

As the binder polymer used in the present invention, it is preferable to use a binder polymer which can be dissolved in a solvent capable of dissolving the previously fried X-type or τ-type phthalocyanine.

Polymers that meet these purposes include:
Polyester, polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyvinyl butyral, polyvinyl acetoacetal, polyvinyl formal, polyacrylonitrile, methyl polymethacrylate, polyacrylate, and copolymers thereof, poly (vinyl chloride / Examples thereof include vinyl acetate / vinyl alcohol), poly (vinyl chloride / vinyl acetate / maleic acid), poly (ethylene / vinyl acetate), poly (vinyl chloride / vinylidene chloride), and cellulosic polymers.

These polymers may be used alone or in two.
It can be used as a mixture of more than one kind.

Of course, as described above, it is possible to combine two or more kinds of solvents, dissolve the X-type or τ-type phthalocyanine with one solvent, and dissolve the binder polymer with another solvent. The binder polymer according to the present invention is not limited to the above polymers.

The optimum ratio of the X-type or τ-type phthalocyanine and the binder polymer described above is 4: 1 by weight.
To 1:10.

When the amount of phthalocyanine is larger than this range, the photosensitive property (potential decay property due to light) itself is excellent, but the charging property is deteriorated and it is generally difficult to apply a potential.

On the other hand, when the amount of the binder polymer is larger than the above range, the photosensitivity is deteriorated.

Further, as an effect of the present invention, the heat resistance stability of the photoreceptor can be improved. That is, since the X-type or τ-type phthalocyanine of the present invention has very high heat resistance, the heat resistance of the photoreceptor is practically determined by the heat resistance of the binder polymer.

Therefore, excellent heat resistance of 150 ° C. or higher is achieved. Now, C which has been used for the conventional photoconductor
Examples of TM include hydrazone compounds, oxazole compounds, triphenylmethane compounds, and arylamine compounds.

When the amount of these materials added to phthalocyanine is 10% or less, there is almost no effect on the improvement of photosensitive characteristics.

On the other hand, when 10% or more is added, the photosensitivity is
The charging stability is significantly deteriorated. Therefore, when these additives are used in a weight of 10% or less, they can be used for improving the frequency dependence of sensitivity.

Next, as another method for producing the photoconductor layer,
A method of changing a part of the crystal system will be described.

Specifically, it is a method for producing a new photoconductor in which X-type phthalocyanine is stirred together with a solvent and a polymer for dissolving the X-type phthalocyanine, and at least a part thereof is formed into another crystal.

By this method, a photoconductive layer excellent in charging property, sensitivity property and durability could be developed.

Therefore, the photoconductor produced by this production method contains at least two types of phthalocyanine, that is, a new crystal type phthalocyanine and an X-type phthalocyanine.

Metal-free phthalocyanine (hereinafter simply referred to as phthalocyanine) is produced by a conventional method by converting the synthesized β-type phthalocyanine into α-type by treating with sulfuric acid and further ball-milling it for a long time.

The crystal is distinctly different from the conventional α type and β type. FIG. 2 shows an X-ray diffraction diagram (measurement by CuKα ray) of X-type phthalocyanine.

The diffraction lines are 2θ = 7.4, 9.0, 1
5.1, 16.5, 17.2, 20.1, 20.
6, 20.7, 21.4, 22.2, 23.
It appears at 8, 27.2, 28.5, 30.3 °.

The strongest diffraction line is a diffraction line near 7.5 ° (corresponding to the surface spacing d = 11.8Å), and assuming that the intensity is 1, the diffraction line intensity (surface of about 9.1 ° The interval d = corresponding to 9.8Å) is 0.66.

The ratio of this strength is hardly influenced by the crystal grain type. The present invention is carried out using this X-type phthalocyanine as a starting material.

The X-type phthalocyanine is put in a reaction vessel together with a solvent having an ability to dissolve at least a part thereof and, if necessary, a binder polymer, and sufficiently mixed by stirring.

Sufficient kneading is an important point of the production method of the present invention. Generally, in order to create such a stable kneaded state, a time of one day or more is required by the usual stirring method.

FIG. 3 shows an X-ray diffraction pattern of the photoreceptor obtained by such a method. This diffractogram is clearly different from the diffractogram of FIG. 2 shown above.

Further, it is also clearly different from the diffraction patterns of α-type and β-type phthalocyanines.

Here, a comparison is made with the X-ray diffraction diagram of the X-type phthalocyanine shown in FIG. In FIG. 3, compared with FIG. 2, 2θ = 2
Diffraction lines above 1.4 ° tend to disappear, 16.5
Diffraction lines around ° tend to increase.

The most noticeable change is 7 of the two diffraction lines near the most characteristic 7.5 ° (d = 11.8Å) and 9.1 ° (d = 9.8Å) of the X-type phthalocyanine. This means that only the diffraction lines near 0.5 ° are selectively lost.

This fact clearly shows that a part of X-type phthalocyanine was changed to a new unknown crystal form by the method of the present invention.

The degree of kneading, time, temperature and the like are as follows.
It depends on the type of solvent and polymer used.

In order to obtain the most excellent characteristics as a photoreceptor, the treatment with this solvent should not be insufficient.

In order to discriminate the appropriate degree of reaction, the diffraction line intensity ratio (I _11.8 / I _9.8 ) between the above-mentioned X-ray pattern and the vicinity of 7.5 ° and 9.1 ° is from 1 to 0. Note that it must be between 1.

Solvents suitable for the purpose of the present invention include nitrobenzene, chlorobenzene, dichlorobenzene, dichloromethane, trichloroethylene, chloronaphthalene, methylnaphthalene, benzene, toluene, xylene, tetrahydrofuran, cyclohexanone, 1.4-
Examples thereof include dioxane, N-methylpyrrolidone, carbon tetrachloride, brombutane, ethylene glycol, sulfolane, ethylene glycol monobutyl ether, acetoxyethoxyethane, pyridine and the like.

The binder polymer according to the present invention includes
It is preferable to use one that dissolves in a solvent that dissolves X-type phthalocyanine.

Polymers suitable for these purposes include polyester, polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyvinyl butyral, polyvinyl acetoacetal, polystyrene, polyacrylonitrile, polymethyl methacrylate and polyacrylate. , Polycarbazole, and copolymers thereof, poly (vinyl chloride / vinyl acetate / vinyl alcohol), poly (vinyl chloride / vinyl acetate / maleic acid),
Poly (ethylene / vinyl acetate), poly (vinyl chloride / vinylidene chloride), melamine resin, alkyd resin, cellulosic polymer, various siloxane polymers, urethane resin,
Etc.

These polymers are used alone or as a mixture of two or more kinds. Of course, as described above, it is possible to combine two or more kinds of solvents, dissolve the X-type phthalocyanine with one solvent, and dissolve the binder polymer with another solvent.

Therefore, the binder polymer according to the present invention is not limited to the above polymers.

The optimum ratio of the X-type phthalocyanine and the binder polymer described above is 4: 1 to 1:10 by weight.

When the amount of the photosensitive material is larger than this ratio, the photosensitive characteristics are excellent, but the charging characteristics are poor.

On the other hand, when the amount of the binder polymer is larger than the above range, the photosensitivity is deteriorated.

The method for producing a photoconductor has been described in detail above. Next, the photoconductor layer according to the present invention effectively solves the technical problem of the photoconductive layer for a spatial light modulator as described above. Describe what you can do.

First, (1) the manufacturing time can be shortened and the manufacturing cost can be reduced. The organic photoconductor layer of the present invention is obtained in a solution state, It can be prepared by simple coating or spin coating, and the film thickness can be controlled by adjusting the solution viscosity.

The thickness of the photoconductor layer is determined by the magnitude of the capacitance of the liquid crystal layer, but the relative permittivity ε'of the organic photoconductor is usually 3 to 4. This is because the thickness is about 6 to 20 μm, and this thickness is a controllable region for coating or spin coating.

Therefore, it is obvious that the method of the present invention is a simple method. Next, (2) enabling high-resolution image reading becomes possible by controlling the resistance value of the photoconductor layer as described above.

The photoconductor of the present invention can be controlled in the range of 10 ⁸ Ωcm to 10 ¹⁴ Ωcm by selecting the type of polymer, and the resolution can be improved by selecting the optimum resistance value.

Next, (3) the point that sufficient heat resistance is obtained is clear from the point that, as already described, it is possible to realize excellent thermal stability as compared with a normal organic photoreceptor.

(4) The fact that the area can be easily increased is a merit that can be naturally derived from the effectiveness of the coating method.

In the present embodiment, the photoconductive layer 14 described above is used.
Each layer including is sandwiched between glass substrates 12 and 19 provided with antireflection films 11 and 20, and a driving power source 21 is connected between the transparent electrodes 11 and 15.

Then, as shown in FIG. 1, the information writing light 17 is transmitted to the photoconductive layer 14 of the spatial light modulator, and the resistance value of the light irradiated portion of the photoconductive layer 14 changes. The electric field corresponding to the changed resistance value is applied to the liquid crystal layer 1.
7 is applied to the liquid crystal molecules, and the alignment state of the liquid crystal molecules is changed and modulated by the applied electric field.

The read light is transmitted to the liquid crystal layer 17 from the side opposite to the write light 17, reflected by the dielectric mirror 15 and blocked by the light blocking layer 16, while being modulated by the liquid crystal layer 17.

Each embodiment of the present invention will be described in detail below. (Example 1) X-type phthalocyanine (Dai Nippon Ink Co., Ltd.)
Made by Fastogen Blue
e) 8120B) and polyvinyl butyral (hereinafter PV
Abbreviated as B: Sekisui Chemical Co., Ltd. S-REC BM-2)
And are dissolved in tetrahydrofuran in a weight ratio of 1: 2,
After sufficiently mixing and kneading, the obtained solution is applied as a photoconductor layer of the spatial light modulator having the above-mentioned constitution by a dip method and treated at 80 ° C. for 1 hour to actually form a photoconductor layer (thickness 12 μm). Formed.

First, the voltage decay curve of the single film of the photoconductive layer was measured by irradiating it with white light of tungsten using a EPA-8100 type paper analyzer manufactured by Kawaguchi Denki KK and measuring the photosensitivity by positive charging.

The half-exposure amount (E _1/2 ) is 0.35lux.
is sec, 1/10 exposure (E _1/10) is 0.8lu
It was x · sec.

This result shows that the obtained characteristics are almost analog. Furthermore, after repeating the test 10 ⁴ times, the characteristics did not change at all.

Next, the characteristics of the spatial light modulator thus obtained were measured. The response speed was 13 msec, which was the optimum sensitivity and had a sufficient resolution.

Further, an experiment was conducted by changing the ratio of X-type phthalocyanine and PVB. It is appropriate that the ratio is between 4: 1 and 1:10. In this range of composition, both charging characteristics and sensitivity characteristics are good. I was able to obtain the characteristics.

(Example 2) τ-type phthalocyanine (manufactured by Toyo Ink Co., Ltd., Riophoton T)
HP)) and PVB were dissolved in tetrahydrofuran in a weight ratio of 1: 2, and sufficiently mixed and kneaded, and then the obtained solution was applied as a photoconductor layer of the spatial light modulator having the above-mentioned structure by a dip method, and then at 80 ° C. And the photoconductor layer (thickness: 12 μm) was actually formed.

First, the voltage decay curve of the single film of the photoconductive layer was measured by irradiating it with white light of tungsten using a EPA-8100 type paper analyzer manufactured by Kawaguchi Denki KK and measuring the photosensitivity by positive charging.

The half exposure (E _1/2 ) is 0.38 lux.
is sec, 1/10 exposure (E _1/10) is 0.9lu
It was x · sec.

This result shows that the obtained characteristics are almost analog. Further, after repeating the test 10 ⁴ times, the characteristics did not change at all.

Next, the characteristics of the spatial light modulator thus obtained were measured. The response speed was 16 msec, which was the optimum sensitivity, and had a sufficient resolution.

From these results, τ-type phthalocyanine was identified as X
It has been revealed that it exhibits excellent photosensitivity as well as the type phthalocyanine.

Further, an experiment was carried out by changing the ratio of τ-type phthalocyanine to PVB, but it is appropriate that the ratio is between 4: 1 and 1:10. With the composition in this range, both charging characteristics and sensitivity characteristics are good. I was able to obtain the characteristics.

(Example 3) X-type phthalocyanine (Dai Nippon Ink Co., Ltd., Fastgen Blue (Fastogen)
n Blue) 8120B) and various binder polymers are mixed in a ratio of 1: 2 and dissolved in tetrahydrofuran,
After sufficiently mixing and kneading, the obtained solution was applied by a dipping method and treated at 80 ° C. for 1 hour to form a photoconductor layer (thickness 10 to 20 μm).

The photosensitivity of the thus obtained photoconductor was measured by using a EPA-8100 type paper analyzer manufactured by Kawaguchi Electric Co., Ltd. and irradiating it with white light from tungsten to obtain photosensitivity (half exposure amount, E ₁ by positive charging). _{/ 2} ) was measured, and the photosensitivity after 10 ⁴ repeated tests was also measured in the same manner.

The results are shown in Table 1.

[0107]

[Table 1]

These layers were formed as the photoconductor layers of the spatial light modulator and evaluated in the same manner as in the above-mentioned examples.

As a result, it was found that each of these various binder polymers has sufficient characteristics as a photoconductor layer for a spatial light modulator.

Further, experiments were carried out by changing the ratio of the X-type phthalocyanine and various binder polymers, but it is appropriate that the ratio is between 4: 1 and 1:10. Both were able to obtain good characteristics.

(Example 4) X-type phthalocyanine (manufactured by Nippon Ink Co., Ltd., Fastgen Blue (Fastogen)
n Blue) 8120B) and polyester (hereinafter PE)
Abbreviated as T: Byron 200 manufactured by Toyobo Co., Ltd.,
It was dissolved in tetrahydrofuran, thoroughly mixed, and then kneaded for 2 days.

The obtained solution was applied by a spinner method,
Photoconductor layer (thickness 12μm) after treatment at 80 ℃ for 1 hour
Was formed.

The X-ray diffraction pattern of the photoconductor layer thus obtained was analyzed by an X-ray diffractometer (Rigaku Denki Co., Ltd.).
Manufactured by RAD-B SYSTEM).

The light source is a CuKα ray. And
EPA-810 manufactured by Kawaguchi Electric Co., Ltd.
Photosensitivity (half exposure, half exposure,
E _1/2 ) was measured, and the characteristics after 10 ⁴ repeated tests were measured in the same manner.

The weight ratio of phthalocyanine to PET is 1: 2.
In the X-ray diffraction diagram in the case of, the diffraction line intensity ratio (I _11.8 / I
_9.8 ) was 0.8, and the diffraction line intensity was significantly changed as compared with the intensity ratio of 1.5 in the case of the raw material X-type phthalocyanine.

Further, this intensity ratio is calculated by comparing the phthalocyanine and P
It was almost constant regardless of the weight ratio of ET.

The half-exposure amount (E _1/2 ) is 0.4lux.
is sec, 1/10 exposure (E _1/10) is 1.0lu
It was x · sec.

This result shows that the obtained characteristics are almost analog. Further, after repeating the test 10 ⁴ times, the characteristics did not change at all.

Next, the characteristics of the spatial light modulator using the photoconductor thus obtained were measured. The response speed is 15m
It had an optimum sensitivity in sec and had a sufficient resolution.

Then, an experiment was conducted by changing the ratio of X-type phthalocyanine and PET, but the ratio is suitably between 4: 1 and 1:10. With the composition in this range, both charging characteristics and sensitivity characteristics are good. I was able to obtain the characteristics.

(Example 5) X-type phthalocyanine (manufactured by Nippon Ink Co., Ltd., Fastgen Blue (Fastogen)
n Blue) 8120B) and PVB are dissolved in tetrahydrofuran and kneaded for 3 days, and the resulting solution is applied by a spinner method and treated at 80 ° C. for 1 hour to form a photoconductor layer (thickness 10 μm). did.

The X-ray diffraction pattern of the photoconductor layer thus obtained was measured by an X-ray diffractometer (Rigaku Denki Co., Ltd.).
Manufactured by RAD-B SYSTEM).

The light source is a CuKα ray. In addition, the characteristics of the single film were measured by EPA-8100 manufactured by Kawaguchi Electric Co., Ltd.
Type paper analyzer is used to illuminate white light from tungsten, and photosensitivity (half exposure, E
_1/2 ) was measured, and the characteristics after 10 ⁴ repeated tests were similarly measured.

The weight ratio of phthalocyanine to PVB is 1: 2.
In the X-ray diffraction diagram in the case of, the diffraction line intensity ratio (I _11.8 / I
_9.8 ) was 0.6, and the diffraction line intensity was remarkably changed as compared with the intensity ratio of 1.5 in the case of the raw material X-type phthalocyanine.

The strength ratio is phthalocyanine and PV
It was almost constant regardless of the weight ratio of B.

Next, the characteristics of the spatial light modulator using the photoconductor thus obtained were measured. The response speed is 11ms
The sensitivity was optimum at ec, and it also had sufficient resolution.

Further, an experiment was conducted by changing the ratio of X-type phthalocyanine and PVB. It is appropriate that the ratio is between 4: 1 and 1:10. With the composition in this range, both charging characteristics and sensitivity characteristics are good. I was able to obtain the characteristics.

[0128]

According to the present invention, the production time can be shortened by using a single-layer organic photoconductor made of X-type or τ-type phthalocyanine and a polymer as the photoconductor layer of the spatial light modulator. It is possible to reduce the manufacturing cost.

Furthermore, high-resolution image reading is possible,
Along with obtaining sufficient heat resistance, it is possible to easily increase the area.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of a spatial light modulator.

FIG. 2 X-ray diffraction pattern of metal-free phthalocyanine

FIG. 3 shows X of metal-free phthalocyanine of each example of the present invention.
Line diffraction diagram

[Explanation of symbols]

 11 Antireflection Film 12 Glass Substrate 13 Transparent Electrode 14 Photoelectric Conductor Layer 15 Reflection Mirror 16 Light Shielding Layer 17 Liquid Crystal Layer 18 Transparent Electrode 19 Glass 20 Antireflection Film 21 Drive Power Supply 22 Information Writing Light 23 Incident Light 24 Reflected Light

Claims (6)

[Claims] 1. A photoconductor layer on which incident light having write information is incident and a charge image corresponding to the image of the incident light is formed, and light corresponding to the charge image formed on the photoconductor layer. A spatial light modulator which has a light modulator layer for performing modulation, and reads out write information optically written by the incident light as optical information, wherein the photoconductor layer has a predetermined height of phthalocyanine. A spatial light modulator that is a single-layer organophotoreceptor containing molecules. 2. The spatial light modulator according to claim 1, wherein a part of the phthalocyanine is at least X-type phthalocyanine. 3. The spatial light modulator according to claim 1, wherein a part of the phthalocyanine is at least a τ-type phthalocyanine. 4. The predetermined polymer is a binder polymer,
The spatial light modulator according to claim 2 or 3, wherein phthalocyanine molecularly dispersed and phthalocyanine particulately dispersed are present in the binder polymer. 5. The spatial light modulator according to claim 2, wherein the X-type phthalocyanine is treated with a solvent that dissolves the X-type phthalocyanine, and at least a part of the crystal system is changed. 6. The spatial light modulator according to claim 1, wherein the weight ratio of the phthalocyanine and the binder polymer is in the range of 4: 1 to 1:10.