JPH03209421A - Applying device of photo-photo converting element - Google Patents

Abstract

PURPOSE:To project a projecting picture without image distortion on a screen by parallelly arranging the image formation surface of electromagnetic radiation for write, the main plane of a projecting lens and the surface of the screen. CONSTITUTION:The image formation surface of a photo-photo converting element PPCe (PPCm), the main plane of a projecting lens Lp and a screen S are made mutually parallel and the PPCe (PPCm), the projecting lens Lp and the screen S are arranged so that the images of electromagnetic radiographic information read out from the PPCe (PPCm) can be formed on the screen S by the projecting lens Lp. Therefore, even when a read beam RL is made incident from the direction excepting for the normal of the surface of the PPCe (PPCm) to the PPCe (PPCm), the picture is projected with the same magnification on the whole surface of the screen S. Thus, the picture in a satisfactory image forming state is projected on the screen S.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to applied devices such as display devices, imaging devices, optical signal processing devices, optical computers, etc., which are constructed by applying light-to-light conversion elements.

(Prior Art) A display device configured using a light-to-light conversion element to display an image with high resolution, and an imaging device configured using a light-to-light conversion element to capture an image with high resolution. , and various other devices applying light-to-light conversion elements have been proposed.

By the way, in a light-to-light conversion device constructed using a light-to-light conversion element constructed of a twisted nematic liquid crystal that utilizes birefringence properties or various electro-optic crystals as a light modulation material layer member, the light modulation material layer is The state of polarization depends on the electric field strength applied to the member.

Since the light modulating material layer member performs an operation that changes the state of optical rotation, the polarization of the light is changed by the electric field intensity of the optical image of the subject and the corresponding charge image when the light passes through the light modulating material layer member. Because it is necessary to extract the readout light whose optical rotation state has changed by using an analyzer as light whose light intensity has changed, the existence of a polarizer and an analyzer in the optical system makes it necessary to However, this method has disadvantages such as reduced efficiency and shading.

Furthermore, when a twisted nematic liquid crystal or various electro-optic crystals that utilize birefringence properties are used as the light modulating material layer member as described above, the light modulating effect of the light modulating material layer member is the same as that of the crystal. Because it depends on the direction of the optical axis, if the readout light is incident from a direction other than the normal to the surface of the light modulation material layer member, the efficiency will drop significantly. Since the incident direction of light is the normal direction of the surface of the light modulating material layer member, in a reflective light-to-light conversion element, the input readout light and the readout light emitted from the light-to-light conversion element are different. To enable separation, an optical member such as a half mirror 1 or a polarizing beam splitter is provided in the optical path, but as is well known, the use of such optical members reduces the efficiency of light utilization and also increases the If both image information is written by incident light, leakage of the writing light may also be read out.

Furthermore, when a light modulating material layer member consisting of a twisted nematic liquid crystal layer is used as the light modulating material layer member described above, a complicated process is required in which the twisted nematic liquid crystal must be injected into a cell made using a spacer. In addition to the drawback of the process required, large-scale light-
When producing a light conversion element, it is difficult to construct a light modulating material layer member using a twisted nematic liquid crystal layer with a uniform thickness. When a single crystal or other solid-state element is used, there are problems such as a high half-wave voltage and difficulty in handling, and furthermore, the light-to-light conversion element is constructed as a flat element. In some cases, a complicated deflection optical system such as an f-theta lens is required to write image information on the entire surface of the light-to-light conversion element by means such as deflection of laser light. There was a problem.

Therefore, in order to construct a light-to-light conversion device that does not have the above-mentioned problems, it is possible to construct a light-to-light conversion device using a light modulating material layer member that operates so that the scattering state of light changes depending on the applied electric field strength. - A light-to-light conversion element application device including a light conversion element has been proposed (see, for example, Japanese Patent Application No. 1-310033).

6 and 7 show an example of the configuration of a light-to-light conversion element using a light modulating material layer member that changes the scattering state of light depending on the electric field intensity as described above, 6th
The light-to-light conversion element PPCe illustrated in the figure is a light-to-light conversion element configured such that information storage operation is performed by a charge image, and the light-to-light conversion element PPCe illustrated in FIG. The light-to-light conversion element PPCm is a light-to-light conversion element in which information storage operation is performed depending on the alignment state of liquid crystal in a polymer-liquid crystal memory film used as a light modulating material layer member. It is element.

First, in FIG. 6, PPCe is a light-to-light conversion element, vb
is a power source, and the light-light conversion element P P Ce includes a transparent electrode Etl, a photoconductive layer member PCL, and a dielectric mirror DML.
A light modulating material layer member HLL formed using a polymer-liquid crystal composite film in which high-resistance liquid crystal is dispersed in a polymer material, and a transparent electrode Et2 are laminated.

In the light-light conversion element shown in FIG.

A dielectric mirror DML is provided between the photoconductive layer member PCL and the light modulating material layer member HLL constructed using a polymer-liquid crystal composite film in which high-resistance liquid crystal is dispersed in a polymer material. As long as the photoconductive layer member PCL reflects the readout light RL and is not sensitive to the readout light RL, the dielectric mirror DML may be omitted. The same applies to the dielectric mirror DML in the light-to-light conversion element shown here.

Light modulating material layer member H in light-light conversion element P P Ce
The polymer-liquid crystal composite film used as LL is, for example, polyester resin, polycarbonate resin, vinyl chloride resin, or polyamide resin.

The volume resistivity of polyethylene resin, polypropylene resin, polystyrene resin, silicone resin is 10″1Ω1
It is constructed by dispersing nematic liquid crystal (or smectic liquid crystal), which exhibits a liquid crystal phase at room temperature and has a high volume resistivity, in the above polymer material.

The liquid crystal in the light modulating material layer member HLL made of a polymer-liquid crystal composite film is confined in countless pores existing in the polymer material, and is used as the light modulating material layer member HLL described above. The above-mentioned pores in the polymer-liquid crystal composite film to be used in the light-to-light conversion element PPCm shown in the examples described later with reference to FIG.
The polymer-liquid crystal composite film used as the light modulating material layer member HLM is said to be larger in size than the countless pores that confine the liquid crystal in the polymer material.

Now, in the light-to-light conversion element PPCe shown in FIG. 6, a voltage is applied from the power supply VB between its two transparent electrodes Etl and Etz, and it is configured as a light modulating material layer member that can operate in a scattering mode. An electric field is applied between the light modulating material layer members HLL, which are made of a polymer-liquid crystal composite film in which high-resistance liquid crystals are dispersed in a polymer material that is
When writing light WL is applied to the photoconductive layer member PCL on the photoconductive layer member PCL side of the photoconversion element PPCe, the electrical resistance value of the photoconductive layer member PCL described above changes in accordance with the incident light that reaches it. A charge image corresponding to the light focused on the photoconductive layer member is generated at the interface between the photoconductive layer member PCL and the dielectric mirror DML.

In the above state, between the two transparent electrodes Etl and EtZ to which the voltage of the power supply vb is applied, a high resistance liquid crystal is formed on the polymer material provided in series with the photoconductive layer member PCL. An electric field with an intensity distribution corresponding to the charge distribution of the charge image corresponding to the writing light is applied to the light modulating material layer member HLL made of the polymer-liquid crystal composite film in which the writing light is dispersed.

In this state, in the polymer-liquid crystal composite film used as the light modulating material layer member HLL, the alignment state of the liquid crystal changes due to the electric field caused by the charge image, and an image of change in the alignment state of the liquid crystal corresponding to the writing light is created. arise.

As described above, the photoconductive layer member PCL and the dielectric mirror D
Based on the electric field due to the charge image generated at the interface with ML,
The image of the change in the alignment state of the liquid crystal that occurs in response to the writing light in the polymer-liquid crystal composite film used as the light modulating layer member HLL is shown at the interface between the photoconductive layer member PCL and the dielectric mirror DML. As long as the generated charge image exists, it remains in that state.

That is, the light modulating material layer member HL is
The electric field applied to the polymer-liquid crystal composite film used as L is a DC electric field, but the liquid crystal with high resistance (
By using a liquid crystal (liquid crystal with an extremely small amount of ions mixed in), it is possible to prevent the image resolution from deteriorating even over a long period of time as described above.

Note that it goes without saying that recording and reproducing operations can be performed even if an AC power source is used as the power source connected between the two transparent electrodes Etl and EtZ in the light-to-light conversion element PPCe shown in FIG. Transparent electrode Etl, EtZ
If a recording operation is performed by connecting an AC power source between the two, the recording of the charge image as described above is not performed, so it is necessary to perform a reproducing operation at the same time as the recording operation.

Next, the charge image (dielectric mirror DM) generated at the interface between the photoconductive layer member PCL and the dielectric mirror DML as described above
If L is not used, the charge image is formed on the photoconductive layer member PC.
It goes without saying that this occurs at the interface between L and the polymer-liquid crystal composite film used as the light modulating material layer member HLL. Since the electric field applied to the liquid crystal composite film disappears, the liquid crystal in the polymer-liquid crystal composite film becomes an isotropic phase, and even if the readout light RL is made incident on the light modulating material layer member HLL, image information is not reproduced. , erasure will be performed.

Therefore, as for the erasing operation, as described above, the photoconductive layer member P
The charge image generated at the interface between CL and dielectric mirror DML (
It goes without saying that when the dielectric mirror DML is not used, a charge image is generated at the interface between the photoconductive layer member PCL and the polymer-liquid crystal composite film used as the light modulating material layer member HLL.) For this purpose, for example, the erasing light from the erasing light source is passed through the lens to the transparent electrode Et of the light-to-light conversion element P P Ce.
The light may be made to enter the light-to-light conversion element PPCe from the 1 side to reduce the electrical resistance value of the photoconductive layer member PCL. The two transparent electrodes Etl and Et2 may be short-circuited as described above, or both may be grounded.

As already mentioned with reference to the 6th @, the charge image corresponding to the writing light is transmitted to the interface between the photoconductive layer member PCL and the dielectric mirror DML in the light-to-light conversion element P P Ce (the dielectric mirror DML is If not used, photoconductive layer member PC
L and the polymer-liquid crystal composite film used as the light modulating material layer member HLL), and in a state where an electric field due to the charge image is applied to the light modulating material layer member HLL, the light - Transparent electrode E in photoconversion element P P Ca
When readout light RL is incident from a light source (not shown) from the t2 side, the readout light RL follows a path of transparent electrode Et2 → polymer-liquid crystal composite film used as light modulating material layer member HLL → dielectric mirror DML. dielectric mirror DM
L and after being reflected there, the light modulating material layer member HLL
Polymer-liquid crystal composite film used as transparent electrode E
The light is emitted from the light-to-light conversion element P P Ce on the path t2.

The readout light RL emitted from the light-to-light conversion element PPCe as described above is transmitted to the interface between the photoconductive layer member PCL and the dielectric mirror DML (if the dielectric mirror DML is not used, the photoconductive layer member PCL and light modulating material layer member HLL
interface with a polymer-liquid crystal composite film used as
The intensity of the light changes in response to the electric field caused by the charge image generated in the image.

That is, by applying an electric field with an intensity distribution corresponding to the optical image of the subject and the charge distribution of the photocharge image to the liquid crystal in the polymer-liquid crystal composite film used as the light modulating material layer member HLL, the above-mentioned The liquid crystal changes its alignment state in response to the electric field intensity applied to it, and the light modulating material layer member H
Since different scattering operations are performed on the readout light RL that passes back and forth through the polymer-liquid crystal composite film used as the LL as described above, when the readout light is projected onto the light modulating material layer member HLL, the light modulating material The light intensity of the readout light RL emitted after passing through the layer member HLL changes in accordance with the optical image of the subject.

In this way, since the reading light RL emitted from the light-to-light conversion element PPCe is in a state where the light intensity is changing in correspondence with the writing light, the change in light intensity is detected by the analyzer. Compared to the case where the light is converted into light and then used, the structure can be simplified and the light can be used more efficiently.

As the light source of the readout light RL, light from any light source such as a laser light source, an incandescent lamp, or a discharge lamp can be used.Also, the readout light RL can be used as a light beam with a minute diameter or a light beam with a large area. Needless to say.

The light modulating material layer member that can operate in the scattering mode in the light-to-light conversion element described so far is a light modulating material constructed using a polymer-liquid crystal composite film in which high-resistance liquid crystal is dispersed in a polymer material. Although we have described an example using a layer member and a light modulating material layer member constructed using a polymer-liquid crystal memory film in which liquid crystal is dispersed in a polymer material, PLZT (PLZT), which repeatedly changes the scattering state of light due to an electric field, has been described. For example, PLZT8
/70/30) may be used as a light modulating material layer member.

Next, the light-light conversion element PPCm shown in FIG. 7 will be explained. In Fig. 7, PPCm is a light-to-light conversion element, vb is a power supply, WL is a write light, RL is a read light, and H
EC is a heating power source.

The light-to-light conversion element PPCm shown in FIG. 7 includes a transparent electrode Etl, a photoconductive layer member PCL, and a dielectric mirror D.
ML, a light modulating material layer member HLM constructed using a polymer-liquid crystal memory film in which liquid crystal is dispersed in a polymer material, a transparent electrode Et2, and a heating layer HEL (this heating layer HEL and transparent electrode Et2 are (It may also have a dual-use configuration).

The heating layer HEL in the light-to-light conversion element PCCm shown in FIG. This is for melting the liquid crystal in the light modulating material layer member HLM configured using a liquid crystal memory film.

The light-light conversion element PPCm shown in FIG. 7 described above
The light modulating material layer member HLM is constructed using a polymer-liquid crystal memory film in which liquid crystal is dispersed in a polymer material.

The polymer-liquid crystal memory film used as the light modulating material layer member HLM in the light-to-light conversion element P P Cm described above is the same as the light-to-light conversion element P P Cm described with reference to FIG.
Similar to the polymer-liquid crystal composite film used as the light modulating material layer member HLL in Ce, for example, methacrylic resin, polyester resin, polycarbonate resin, vinyl chloride resin, polyamide resin, polyethylene resin, polypropylene resin, polystyrene resin, It can be constructed by dispersing nematic liquid crystal (or smectic phase), which exhibits a liquid crystal phase at room temperature and has a high volume resistivity, in a polymer material such as silicone resin with a volume resistivity of 1014 Ω1 or more. .

The liquid crystal used to construct the polymer-liquid crystal memory film HLM mentioned above has a nematic phase (
Any material may be used, including those that form a smectic phase (or smectic phase), but the use of materials with high volume resistivity and high viscosity means that information can be reproduced with a high contrast ratio. and produce good results in improving recording performance. Furthermore, it is necessary that the liquid crystal used for the above-mentioned structure of the polymer-liquid crystal memory@iHLM has a melting point lower than that of the polymer material.

By the way, the polymer-liquid crystal memory film used as the light modulating material layer member HLM in the above-mentioned light-light conversion element PPCm uses the polymer-liquid crystal composite film already described with reference to FIG. A light modulating material layer member HLL configured as
However, unlike the case where the alignment state of the liquid crystal was maintained by the electric field applied thereto, the light modulating material layer member HL
A memory function in which an electric field is applied to M to change the orientation state of the liquid crystal in the polymer-liquid crystal memory film, and then the orientation state of the liquid crystal in the polymer-liquid crystal memory film does not change even if the electric field is removed. It is made as if it were equipped with the following.

The liquid crystal used as one of the constituent elements of the polymer-liquid crystal memory film HLM described above is the polymer-liquid crystal memory wA.
It is encapsulated in countless minute pores that are randomly distributed in the porous polymer material membrane used as other components of HLM. The memory function of the liquid crystal in the polymer-liquid crystal memory film described above is achieved by reducing the size of the pores in the polymer material in which the liquid crystal is confined, and by reducing the size of the pore walls added to the liquid crystal in the polymer material. It is believed that this can be achieved by increasing the force of , and it is a desirable embodiment that the pores have a diameter of, for example, about 0.5 microns or less.

As mentioned above, an electric field is applied to the liquid crystal sealed in the countless minute pores randomly distributed in the porous polymer material film of the polymer-liquid crystal memory film. The following is a supplementary explanation of the memory function in which the alignment state that occurs in the liquid crystal so that the liquid crystal memory film tends to become transparent continues to be maintained even after the above-mentioned applied electric field is removed.

The liquid crystal molecules encapsulated in the pores are encapsulated in a nematic phase (or smectic phase) in the minute pores under the force of the pore wall surface. The liquid crystal molecules sealed in the pores are subjected to surface forces of the pore walls, and the closer the liquid crystal molecules are to the pore walls, the greater the force applied.Therefore, the smaller the pores are, the more The effect of the surface force of the pore wall on the liquid crystal molecules encapsulated in the liquid crystal molecules becomes large). When an electric field with an electric field strength above a certain threshold is applied to a liquid crystal, a nematic phase (or smectic phase) forms in the pores under the force from the surface of the pore walls.
The liquid crystal molecules sealed in this state resist the force applied from the surface of the pore wall and are displaced so as to align in the direction of the electric field.

The mode of displacement that occurs in liquid crystal molecules in response to the application of an electric field changes depending on the strength of the applied electric field, and when the electric field applied to the liquid crystal is weak, Only liquid crystal molecules with a weak force, that is, liquid crystal molecules mainly located near the center of the pores, are displaced with a tendency to face the direction of the applied electric field, and the strength of the electric field applied to the liquid crystal gradually becomes stronger. As the force increases, the liquid crystal molecules that are placed near the pore wall, which are subjected to a strong force from the surface of the pore wall, also tend to have their molecular axes oriented in the direction of the applied electric field. The liquid crystal molecules are oriented in a manner of displacement.

Therefore, liquid crystals are encapsulated in a nematic phase (or smectic phase) in countless minute pores that are randomly distributed and formed in a porous polymer material film in a polymer-liquid crystal memory film. The molecules are oriented in such a manner that when an electric field is applied, the molecules are displaced in such a way that the direction of the molecular axis of the liquid crystal is oriented in the direction of the electric field against the force applied from the surface of the pore wall described above. However, since the liquid crystal molecules oriented by the electric field applied as described above are held in the same state by the surface force of the pore walls, they are not changed by the application of the electric field as described above. The alignment state of the liquid crystal remains in that state even after the applied electric field is removed, so it exhibits a memory function.

In order to erase the storage state of information due to the orientation state of the liquid crystal, it is necessary to adjust the melting point of the polymer used as the light modulating material layer member HLM and the liquid crystal in the liquid crystal memory film to the polymer material. It is necessary to perform this by heating the liquid crystal to a temperature between the melting point and melting the liquid crystal into an isotropic phase. The liquid crystal cools over time and becomes a nematic phase (or smectic phase), and that part changes to an opaque state.

First, a voltage is applied from the power source VB between the two transparent electrodes Etl and EtZ of the light-to-light conversion element PPCm shown in FIG. 7 to form a light modulating material layer member that can operate in a scattering mode. An electric field is applied between the light modulating material layer member HLM made of a polymer material and a liquid crystal memory film in which liquid crystal is dispersed, and the light-light conversion element PPCm
When an optical image of a subject is formed as writing light WL on the photoconductive layer member PCL from the photoconductive layer member PCL side through an imaging lens (not shown), the electric resistance value of the photoconductive layer member PCL described above changes accordingly. In order to change correspondingly to the optical image due to the incident light that arrives.

A charge image corresponding to the optical image of the subject formed on the photoconductive layer member is generated at the interface between the photoconductive layer member PCL and the dielectric mirror DML.

In the above state, liquid crystal is dispersed in the polymeric material provided in series with the photoconductive layer member PCL between the two transparent electrodes Etl and EtZ to which the voltage of the power supply Vb is applied. An electric field with an intensity distribution corresponding to the charge distribution of the charge image corresponding to the optical image of the object is applied to the light modulating material layer member HLM made of the polymer-liquid crystal memory film.

In this state, in the polymer-liquid crystal memory film used as the light modulating material layer member HLM, the alignment state of the liquid crystal changes due to the electric field caused by the charge image, and the alignment state of the liquid crystal corresponds to the electromagnetic radiation image of the subject. A changed image is generated and its state of orientation is memorized.

As described above, the photoconductive layer member PCL and the dielectric mirror D
Based on the electric field caused by the charge image generated at the interface with the ML, a change in the alignment state of the liquid crystal occurs in the polymer-liquid crystal memory film used as the light modulating material layer member HLM in response to the electromagnetic radiation image of the subject. The image remains as it is even if the charge image generated at the interface between the photoconductive layer member PCL and the dielectric mirror DML is removed.

Heating layer HE in the light-to-light conversion element PPCm shown in FIG.
When the readout light RL is incident from the L side from a light source (not shown), the readout light RL is transmitted through the heating layer HEL→transparent electrode Et2→the polymer-liquid crystal memory film used as the light-changing material layer member HLM→the dielectric It reaches the dielectric mirror DML via the path of the body mirror DML, and after being reflected there, it is transferred from the polymer-liquid crystal memory film used as the light modulating material layer member HLM to the light-light conversion element PPCm via the path of the transparent electrode Et2.
Emits from.

The readout light RL emitted from the light-light conversion element P P Cm as described above is an image of the change in the alignment state of the liquid crystal occurring in the polymer-liquid crystal memory film used as the light modulating material layer member HLM. The intensity of the light changes accordingly.

In this way, the readout light RL emitted from the light-to-light conversion element PPCm has a light intensity varying in correspondence with the writing light, so that the readout light from the conventional light-to-light conversion element is different from the light intensity. Compared to the case where it is used after converting it into light with varying intensity using an analyzer,
The advantage is that the configuration can be simplified and light can be used efficiently.

Note that as the light source of the readout light RL, light from any light source such as a laser light source, an incandescent lamp, or a discharge lamp can be used. Further, it goes without saying that the readout light RL can be used either as a light beam with a minute diameter or as a light beam with a large area.

Next, in order to erase the information stored by the alignment state of the liquid crystal in the polymer-liquid crystal memory film used as the light modulating material layer member HLM as described above, the light modulating material layer member HLM is The temperature of the liquid crystal in the polymer-liquid crystal memory film used as a liquid crystal memory film is raised to a temperature between the melting point of the polymer material and the melting point of the polymer material to melt the liquid crystal and make it into an isotropic phase. However, in the display device of the embodiment shown in FIG.
Cm heating layer HEL (this heating layer HEL and transparent electrode Et
2) to generate heat in the heating layer HEL, and heat the polymer-liquid crystal memory film used as the light modulating material layer member HLM. This can be done by heating the liquid crystal in the liquid crystal memory film to a temperature between the melting point of the liquid crystal and the melting point of the polymer material to melt the liquid crystal into an isotropic phase.

Note that a charge image (dielectric mirror DM) generated at the interface between the photoconductive layer member PCL and the dielectric mirror DML during the writing operation
If L is not used, the charge image is formed on the photoconductive layer member PC.
It goes without saying that this occurs at the interface between L and the polymer-liquid crystal memory film used as the light modulating material layer member HLM. Before performing the memory erasing operation in
It is necessary to erase that charge image mentioned above as well.

In order to erase the charge image, erasing light from an erasing light source is made to enter the light-to-light conversion element PPCm from the transparent electrode Etl side through a lens, and the electrical resistance value of the photoconductive layer member PCL is All you have to do is lower it. During the erasing operation, the two transparent electrodes Etl and EtZ may be short-circuited, open, or grounded.

The light-to-light conversion element PPCe (or PPCm) explained with reference to FIGS. 6 and 7 above uses a light modulating material layer member that changes the scattering state of light according to the electric field strength. Because of this structure, it is possible to read out information even when the direction of incidence of the readout light RL is in a direction other than the normal direction of the light-to-light conversion element PPCe (or PPCm), so information can be read out with high light utilization efficiency. I can do it.

(Problem to be Solved by the Invention) However, the incident direction of the readout light RL is
When the direction is other than the normal direction of Ce (or PPCm), the light-to-light conversion element P
The image on the screen that is emitted from e (or P P Cm ) and projected onto the screen by the projection lens has different image formation conditions in each part of the screen, and also has different image magnification in each part of the screen. A problem arises in that an image with image distortion is projected onto the screen.

(Means for Solving the Problems) The present invention provides a light beam structure comprising at least a photoconductive layer member and a light modulating material layer member capable of operating in a scattering mode between two electrodes to which a predetermined voltage is applied. - Applying electromagnetic radiation for writing to the photoconductive layer member through the electrode on the side of the photoconductive layer member in the photoconversion element, so that electromagnetic radiation for writing corresponds to the above-mentioned electromagnetic radiation for writing between the photoconductive layer member and the light modulating material layer member. means for generating a charge image; means for causing a change in the degree of scattering of light in the light modulating material layer member by an electric field caused by the charge image; means for reading out changes in the degree of scattering of light corresponding to the electromagnetic radiation in the light modulating material layer member using readout electromagnetic radiation having an optical axis; A light-to-light conversion element application device comprising means for correcting with an optical system, and at least a photoconductive layer member and a light source capable of operating in a scattering mode between two electrodes to which a predetermined voltage is applied. A writing electromagnetic radiation is applied to the photoconductive layer member through the electrode on the photoconductive layer member side of the light-to-light conversion element constituted by the modulating material layer member, thereby creating a gap between the photoconductive layer member and the light modulating material layer member. means for generating a charge image corresponding to the electromagnetic radiation for writing; means for causing a change in the degree of scattering of light in the light modulating material layer member by an electric field caused by the charge image; and a light-light conversion element. means for reading out a change in the degree of scattering of light corresponding to the electromagnetic radiation in the light modulating material layer member using readout electromagnetic radiation having a main optical axis in a direction other than the normal direction of the light modulating material; An application device for a light-to-light conversion element is provided, which includes means for predistorting an image shape formed by writing light so as to cancel out image distortion occurring on an image plane.

(Function) Using readout electromagnetic radiation having a main optical axis in a direction other than the normal direction to a light-to-light conversion element that includes a light modulating material layer member that can operate in a scattering mode. In the application device of the light-to-light conversion element using the light-to-light conversion element which reads out the change in the degree of scattering of light of the light modulating material layer member, the electromagnetic radiation for writing in the light-to-light conversion element is used. The imaging plane of the projection lens, the main plane of the projection lens, and the screen surface are parallel to each other, and the electromagnetic radiation information read from the light-to-light conversion element is imaged on the screen by the projection lens. A light-to-light conversion element, a projection lens, and a screen are arranged.
To project a projection image without image distortion on a screen.

Further, the present invention relates to a light-to-light conversion element including a light modulating material layer member capable of operating in a scattering mode.

A light-to-light conversion element is used that reads out changes in the degree of scattering of light of the light modulating material layer member using readout electromagnetic radiation having a main optical axis in a direction other than the normal direction thereof. In an application device of a light-to-light conversion element, the extension of the imaging plane of electromagnetic radiation for writing in the light-to-light conversion element, the extension of the main plane of the projection lens, and the extension of the screen are approximately 1
The above-mentioned light-to-light conversion element, projection lens, and screen are arranged so as to intersect on a straight line, and the image shape by the writing light is adjusted so as to cancel the trapezoidal distortion that occurs in the image projected on the screen. The writing light is previously distorted into a trapezoid, and the intensity of the writing light is modulated in correspondence with the trapezoid, so that shading does not occur on both images on the screen.

The above-mentioned method uses a readout electromagnetic radiation having a main optical axis in a direction other than the normal direction to a light-to-light conversion element including a light modulating material layer member capable of operating in a scattering mode. In a light-to-light conversion element application device using a light-to-light conversion element that reads out changes in the degree of scattering of light in a light modulating material layer member, imaging of electromagnetic radiation for writing in the light-to-light conversion element is performed. The extension of the surface, the extension of the main plane of the projection lens, and the extension of the screen intersect on approximately one straight line, and the extension of the imaging surface of the electromagnetic radiation for writing in the light-to-light conversion element and the light-to-light conversion element The center of the screen, the principal point of the projection lens, and the light -
The screen, the projection lens, the light-to-light conversion element, the imaging lens to the light-to-light conversion element, and the original are aligned so that the principal point of the imaging lens to the light conversion element and the center of the document surface are aligned. so that an image without image distortion is projected onto the screen.

(Example) Hereinafter, specific contents of the application device of the light-light conversion element of the present invention will be explained in detail with reference to the accompanying drawings. 1 to 3 and FIG. 5 are block diagrams of embodiments of the application device of the light-to-light conversion element of the present invention, and FIG. - It is a top view of some structural members of the application device of a light conversion element.

In FIG. 1, PPCe (PPCm) is a light-to-light conversion element, Lp is a projection lens, S is a screen, LS is a light source of readout light, Lcn is a condenser lens, and vb is a power source.

In the apparatus shown in FIG.
When the image is formed on the imaging plane of the light conversion element PPCe (PPCm), the writing light WL is applied to the light-to-light conversion element PPCe (PPCm) as already described in FIGS. 6 and 7. A write operation is performed.

The device shown in FIG. 1 includes a light-light conversion element PPCe.
The imaging plane in (PPCm), the main plane of the projection lens Lp, and the screen S are made parallel to each other, and the projection lens Lp allows the light-to-light conversion element PPC
The above-mentioned light-to-light conversion element P is configured so that the electromagnetic radiation information read from
PCe (PPCm), projection lens Lp, and screen S
Since the light-light conversion element PPCe (P
PCm) from a direction other than the normal to the surface of the light-light conversion element PP.
Even when the readout light RL is incident on Ce (PPCm), a well-formed image of the kite is projected onto the screen S at the same magnification over the entire surface of the screen S.

However, in a device configured as shown in the first diagram,
When a normal optical system is used because the angle of view becomes larger, the amount of light may decrease significantly from the center to the periphery of an image, but this problem is solved as shown in Figure 2 and This problem can be solved by the devices shown in FIGS. 3 and 5.

First, in Fig. 2, 1 is a laser light source that emits laser light whose intensity is modulated by the information signal to be displayed, 2 is a control unit, 3 is a modulation circuit, PDEF is an optical deflector, and Lf is a writing light. imaging lens, PPCe (PPCm)
is a light-light conversion element, Lp is a projection lens, S is a screen, LS is a light source of readout light, Lcn is a condenser lens,
M r e f is a reflecting mirror, and vb is a power source.

A laser light source 1 emits laser light whose intensity is modulated according to information given from a modulation circuit 3, and transmits the laser light to an optical deflector PD.
Supply to EF. The optical deflector PDEF deflects the supplied laser light in a predetermined manner and emits it. The laser beam emitted from the optical deflector PDEF is focused as writing light WL on the imaging plane of the light-to-light conversion element PPCe (PPCm) by the imaging lens Lf of the writing light, and then ), a writing operation is performed by the writing light WL as already described with reference to FIGS. 6 and 7.

The information signal is read out from the light-to-light conversion element PPCe (PPCm) by making the readout light RL incident thereon as already described with reference to FIGS. 6 and 7.

In FIG. 2, the readout light RL is the light emitted from the readout light source LS and the light emitted from the condenser lens Lcn and the reflecting mirror M.
The light-to-light conversion element P P Ce (
P P Cm ) is incident from a direction different from the normal direction thereof. The reflecting mirror M r e f described above is provided as necessary.

In FIG. 2, the light-light conversion element PPCe (PPCm), the projection lens Lp, and the screen S are the light-light conversion element PPCm.
Arranged in such a way that the extension of the imaging plane of the electromagnetic radiation for writing in P Ce (P P Cm ), the extension of the principal plane of the projection lens Lp, and the extension of the screen S substantially intersect on one straight line. Therefore, the above-mentioned readout light R
By the incidence of L, the light-light conversion element PPCe (PPCm)
The image information read out is projected onto the entire surface of the screen S in a good image formation state by the projection lens Lp.

By the way, in the device shown in the second figure, the light-light conversion element P
The image read from PCe (PPCm) is the 85th i! I
As shown in (a), for example, in the case of a base-like object, the screen S
Images projected at different magnifications for each part above have trapezoidal distortion as shown in FIG. 8(b).

Therefore, in order to project an image free of trapezoidal distortion onto the screen S, in the apparatus shown in the second figure, when the image to be projected is, for example, a grid pattern, the light-light The image written on the conversion element PPCe (PPCm) was previously assumed to be distorted into an inverted trapezoidal shape as shown in FIG. 9(a), and trapezoidal distortion occurred in the readout optical system. Sometimes, it is projected onto a screen S by a projection lens LP as a substrate eye-like object.

Note that black information is written in the surrounding hatched area in FIG. 9(a), so that the surrounding area in the image shown in FIG. 9(b) projected onto the screen S is The shaded area will be displayed as black. Writing may be performed only in the shaded area shown in FIG. 10.

In the apparatus shown in FIG. 2, when the image to be projected by the writing light WL is, for example, a substrate pattern, the image to be written on the light-to-light conversion element PPCe (PPCm) is ), the optical deflector P is pre-distorted into an inverted trapezoidal shape.
A control circuit 2 controls the manner in which the readout light is deflected by the laser beam in the DEF.

Furthermore, as described above, the mode of deflection of the readout light by the laser beam in the optical deflector PDEF is controlled by the control circuit 2, and the horizontal scanning speed is changed.
Shading of light intensity occurs in the vertical scanning direction in the projected image. Therefore, the control circuit 2 controls the amplitude of the modulated wave signal supplied from the modulation circuit 3 to the laser light source 1 to prevent the above-mentioned shading from occurring in the projected image.

It is well known that the shape of one image is deformed due to aberrations in the optical system. For example, the original image shown in FIG. 11(a) is
The image may have barrel distortion as shown in b), or it may have binction distortion as shown in FIG. 11(c).
Optical deflector PDEF controlled by the control section 2 described above
The mode of deflection of the readout light by the laser beam in the above is made such that image distortion generated in the optical system used in the device can also be corrected, and the intensity modulation of the laser beam is also corrected at the same time as the correction of the image distortion described above. It is also possible to control and correct shading of light intensity.

FIG. 3 shows that an optical path limiting member Mm as illustrated in FIG. 4 is installed between the projection lens Lp and the screen S in the apparatus described with reference to FIG. 2, so that the image frame shape is rectangular. The projected image is projected onto the screen S, and the optical path limiting member Mm illustrated in FIG.
is a trapezoidal reflecting mirror surrounded by at byc,d. Note that the optical path limiting member M described above
m may be configured as a diaphragm instead of a single reflecting mirror (if the optical path limiting member Mm described above is a diaphragm, it may be provided between the projection lens Lp and the screen S in FIG. ).

Next, in the apparatus shown in FIG. 5, LSw is the light source of the writing light, and 0 is the original (original) containing image information to be displayed, and the original 0 in the illustrated example is It is said to be like recorded photographic film.

Lf is a writing light imaging lens, PPCe (PPCm) is a light-light conversion element, LP is a projection lens, S is a screen,
LS is the light source of the readout light, Lcn is the condenser lens, M
r8f is a reflecting mirror, and vb is a power source.

Writing light W whose intensity is modulated by the original 0
L is imaged on the imaging plane of the light-to-light conversion element PPCe (PPCm) by the imaging lens Lf of the writing light, and is transferred to the light-to-light conversion element PPCs (PPCm) by the writing light WL as shown in FIGS. The write operation is performed as already described with respect to FIG. This is done by making it incident.

In FIG. 5, readout light RL is emitted from a light source LS of readout light as in the case of the apparatus shown in FIG.
The light-to-light conversion element PPCe (PPC
m) is incident from a direction different from the normal direction thereof.

In FIG. 5, the projection lens Lp and the screen S are:
The extension of the imaging plane of the electromagnetic radiation for writing in the light-light conversion element P P Ca (P P Cm ), the extension of the main plane of the projection lens LP, and the extension of the screen S are approximately 1.
Because they are arranged so that they intersect in a straight line.

The extension of the imaging plane of the writing electromagnetic radiation in the light-to-light conversion element PPCe (PPCm), the extension of the principal plane of the projection lens LP, and the extension of the screen S intersect on approximately one straight line, and the light-to-light conversion Conversion element PP Ce (P P Cm
) Extension of the imaging plane of electromagnetic radiation for writing and light −
The extension of the main plane of the imaging lens Lf to the light conversion element PPCe (PPCm) and the extension of the 0th surface of the original are arranged so that they intersect on approximately one straight line, and the center of the screen S and the projection lens Lp
The screen S, the projection lens LP, and the light-to-light conversion element PPCe (P
PCm) and the light-to-light conversion element PPCe (PPCm), the imaging lens Lf and the 0th surface of the original are arranged, so that the light-to-light conversion element PPCe (PPCm) is
The image information read from PCm) is projected onto the entire surface of the screen S in a good image formation state by the projection lens Lp.

The information on page 0 of the original is transmitted to the light-to-light conversion element PPCe (PPCm)
The light-to-light conversion element PPCe (P
When the image of the document O is formed on the screen S via the projection lens Lp, the image of the document O is written as having been transformed into an inverted trapezoid shape in a predetermined manner. This is done so that the image projected onto the screen is free from image distortion.

Up to now, the case where the present invention is applied to a display device has been described, but it goes without saying that the present invention can also be favorably applied to an imaging device, an optical computer, and other devices.

(Effects of the Invention) As is clear from the above detailed explanation, one aspect of the present invention is to provide at least a photoconductive layer member between two electrodes to which a predetermined voltage is applied, and a light source capable of operating in a scattering mode. A writing electromagnetic radiation is applied to the photoconductive layer member through the electrode on the photoconductive layer member side of the light-to-light conversion element constituted by the modulating material layer member, thereby creating a gap between the photoconductive layer member and the light modulating material layer member. means for generating a charge image corresponding to the electromagnetic radiation for writing; means for causing a change in the degree of scattering of light in the light modulating material layer member by an electric field caused by the charge image; and a light-light conversion element. means for reading out a change in the degree of scattering of light corresponding to the electromagnetic radiation in the light modulating material layer member using readout electromagnetic radiation having a main optical axis in a direction other than the normal direction of the light modulating material; A light-to-light conversion element application device comprising means for correcting image distortion occurring on an image plane using a readout optical system, and at least a photoconductive layer member between two electrodes to which a predetermined voltage is applied. A writing electromagnetic radiation is applied to the photoconductive layer member through an electrode on the photoconductive layer member side of the light-to-light conversion element constituted by a light modulating material layer member capable of operating in a scattering mode. A means for generating a charge image corresponding to the writing electromagnetic radiation between the light modulating material layer member and a means for causing a change in the degree of scattering of light in the light modulating material layer member by an electric field caused by the charge image. A change in the degree of scattering of light corresponding to the electromagnetic radiation in the light modulating material layer member using a readout electromagnetic radiation having a principal optical axis in a direction other than the normal direction of the light-to-light conversion element. This is an application device of a light-to-light conversion element, which is equipped with a reading means and a means for predistorting the image shape formed by the writing light so as to cancel the image distortion occurring on the imaging plane of the reading light. Readout light RL is applied to the light-to-light conversion element from a direction other than the normal to the surface of the light-to-light conversion element.
Even when the light is incident on the screen, an image can be projected on the screen at the same magnification and in good imaging condition over the entire surface of the screen.

In this case, even if a normal optical system is used, the amount of light in the peripheral area will not be significantly reduced due to shading, and a good image can be projected without image distortion due to aberrations of the optical system.

[Brief explanation of drawings]

1 to 3 and 5 are block diagrams of embodiments of the light-to-light conversion element application device of the present invention, and FIG. 4 is the light-to-light conversion element shown in FIG. 3. FIG. 6 and FIG. 7 are diagrams showing a configuration example of a light-to-light conversion element, and FIGS. 8 to 11 are explanatory diagrams of images and distortions. DESCRIPTION OF SYMBOLS 1... A laser light source that emits laser light whose intensity is modulated by an information signal to be displayed, 2... Control section, 3... Modulation circuit, PDEF... Optical deflector.

Claims (1)

[Claims] 1. A light-to-light conversion element constituted by at least a photoconductive layer member and a light modulating material layer member capable of operating in a scattering mode between two electrodes to which a predetermined voltage is applied. A writing electromagnetic radiation is applied to the photoconductive layer member through an electrode on the side of the photoconductive layer member to produce a charge image corresponding to the writing electromagnetic radiation between the photoconductive layer member and the light modulating material layer member. means for causing a change in the degree of scattering of light in the light modulating material layer member by an electric field caused by the charge image; and a main optical axis in a direction other than the normal direction of the light-light conversion element. means for reading out changes in the degree of scattering of light corresponding to the electromagnetic radiation in the light modulating material layer member using readout electromagnetic radiation; and a readout optical system for correcting image distortion occurring on the imaging plane of the readout light. A light-to-light conversion element application device 2 comprising means for: at least a photoconductive layer member and a light modulating material layer member capable of operating in a scattering mode between two electrodes to which a predetermined voltage is applied; Electromagnetic radiation for writing is applied to the photoconductive layer member through the electrode on the photoconductive layer member side of the light-to-light conversion element constructed by means for generating a charge image corresponding to electromagnetic radiation; means for causing a change in the degree of scattering of light in the light modulating material layer member by an electric field caused by the charge image; and a normal direction of the light-to-light conversion element. A means for reading out a change in the degree of scattering of light corresponding to the electromagnetic radiation in the light modulating material layer member using readout electromagnetic radiation having a main optical axis in a direction other than the above; A light-to-light conversion element application device 3 comprising means for pre-distorting the shape of an image formed by writing light so as to cancel out image distortion; 3. The light-light conversion element application device according to claim 1 or 2, further comprising a shaping means.