JPH0725865Y2 - Recording / reproducing apparatus for information signal by charge image - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a recording / reproducing apparatus for an information signal by a charge image.

(Prior Art) In recent years, new demands for television systems, such as so-called EDTV and HDTV, have been proposed in response to increasing demands for high-quality and high-resolution reproduced images. As is well known, in order to obtain a reproduced image with high image quality and high resolution, an imaging device capable of generating a video signal capable of reproducing the reproduced image with high image quality and high resolution is required. Although it is required, in an image pickup apparatus in which an image pickup tube is used as an image pickup element, there is a limit to the miniaturization of the electron beam diameter in the image pickup tube, so that it is not possible to expect a higher resolution due to the smaller electron beam diameter. In addition, since the target capacity of the image pickup tube increases corresponding to the target area, it is not possible to realize high resolution by increasing the target area. For example, in the case of a moving image capturing device, the image signal frequency band becomes several tens of MHz to several hundreds MHz or more as the resolution increases, which causes a problem in terms of S / N. It is difficult for the device to generate a video signal capable of reproducing a high-quality / high-resolution reproduced image.

As described above, the conventional image pickup apparatus cannot generate a video signal capable of reproducing a high-quality / high-resolution reproduced image satisfactorily due to the presence of the image pickup element indispensable for its configuration. In order to solve the above-mentioned point, the applicant company first obtained a high-resolution optical image with an imaging device using a light-to-light conversion element, and used the light-to-charge conversion element to obtain the optical image. We proposed an imaging method and a recording method for recording a high-resolution charge image on a recording medium having a charge storage layer (or charge holding layer).

By the way, a high-resolution optical image is obtained by the image pickup device using the light-to-light conversion element, and the optical image is transferred to the recording medium having the charge storage layer by using the light-to-charge conversion element. When the imaging system and the recording system by the applicant company of the present invention are recorded, it is necessary to read the charge image recorded on the recording medium as an electric signal. When optically reading is performed, for example, a transparent electrode and a light modulation material layer member {a light modulation material layer member (for example, a light modulation material layer member exhibiting characteristics capable of changing the state of light depending on an applied voltage) A material layer for light modulation such as a lithium niobate single crystal having an electro-optical effect, bismuth silicate oxide, or a layer of a nematic liquid crystal exhibiting an electric field scattering effect may be used)} Detection head constructed by laminating a dielectric mirror has been used.

(Problems to be Solved by the Invention) In the above-described conventional device, a transparent electrode and a light modulation material layer member as a detection head {a light modulation material layer exhibiting characteristics capable of changing a light state depending on an applied voltage. A member (for example,
(Lithium niobate single crystal having an electro-optic effect, or bismuth silicate oxide, a material layer for light modulation such as a layer of a nematic liquid crystal exhibiting an electric field scattering effect may be used)} and a dielectric mirror are laminated. However, it is not easy to fabricate the above-mentioned dielectric mirror because it has a multi-layered structure, and the dielectric mirror transmits part of the light incident on it. Therefore, since the reflectance does not reach 100%, it is difficult to construct a highly sensitive detection head, and improvement measures for them have been required.

(Means for Solving the Problems) The present invention has a function of holding a charge image, and is composed of a material capable of transmitting read light used for reading the held charge image. A recording / reproducing apparatus for an information signal by means of a charge image, in which the recording / reproducing of an information signal to be recorded is performed by using a recording member having a layer formed on an electrode forming a light reflection surface of a substrate. , The emission of the reading light flux in the detection head in which the transparent electrode on which the reading light flux is to be incident is provided on one of the two facing surfaces of the optical member that changes the state of light according to the intensity distribution of the applied electric field Means for arranging the other surface thereof so as to face the recording member to be reproduced, and means for making the reading light flux incident from the transparent electrode side of the detection head described above. A means for allowing the read light flux emitted from the detection head to enter the charge holding layer of the recording member and transmitting the charge holding layer of the recording member; and a read light beam transmitted through the charge holding layer of the recording member in the recording member. Means for reflecting light by an electrode forming a light reflecting surface, and an optical member for changing the light state of the reflected light of the read light according to the intensity distribution of the electric field applied to the charge holding layer in the recording member and the detection head. And means for transmitting the transparent electrode, and a means for photoelectrically converting the light emitted from the transparent electrode to the photoelectric converter through the analyzer, and performing photoelectric conversion by the photoelectric converter. A recording / reproducing apparatus is provided.

(Embodiment) Hereinafter, specific contents of the information signal recording / reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are block diagrams of an embodiment of a recording / reproducing apparatus for information signals by means of a charge image according to the present invention.

In the block diagram of a recording / reproducing apparatus for information signals by charge image of the present invention shown in the figure, 1 is a laser light source used as a light source for reading light, 2 is a lens, and 3 is a polarizer provided as necessary. 4 is a beam splitter, 5 is a wave plate provided as necessary, 6 is an analyzer, 7 is a photoelectric converter, RA is a detection head, and D is an information signal to be recorded or reproduced. A recording member (recording medium) on which a corresponding charge image is to be read.

The recording member D in the illustrated configuration example has a substrate BL, an electrode CL formed of a conductive material and having a surface forming a reflection surface for light, a charge image holding function, and a holding member. A charge holding layer IL made of a material capable of transmitting read light used for reading a read charge image used for reading a read charge image.

The charge holding layer IL can be made of, for example, silicon resin, and the electrode CL can be made of, for example, a vapor deposited film of aluminum.

In addition, the detection head RA used in the recording / reproducing apparatus for the information signal by the electric charge image illustrated in the drawing has a transparent electrode Et.
And light modulation material layer member PML {light modulation material layer member PML exhibiting characteristics such that the state of light can be changed by an applied voltage
(For example, a lithium niobate single crystal having an electro-optical effect, or bismuth silicate oxide, or a material layer for light modulation such as a layer of a nematic liquid crystal exhibiting an electric field scattering effect may be used.)} It is composed of.

In one embodiment of the information signal recording / reproducing apparatus according to the present invention shown in the drawing, the read light flux (laser light flux) emitted from the laser light source 1 used as the light source of the read light is required. The light is made parallel by a lens 2 provided accordingly, and then made into a linearly polarized light having a predetermined polarization plane by a polarizer 3 provided as necessary, and then incident on a beam splitter 4.

The laser beam that has passed through the beam splitter 4 is detected by the detection head.
Light modulation material layer member PML incident on RA (a light modulation material layer member PML exhibiting characteristics such that the state of light can be changed by an applied voltage (for example, a lithium niobate single crystal having an electro-optic effect, or A material layer for light modulation such as a layer of bismuth silicon oxide or a nematic liquid crystal exhibiting an electric field scattering effect may be used)} and is incident on the charge retention layer IL in the recording member D.

The above-mentioned laser light flux passes through the charge holding layer IL of the recording member D and then forms an electrode for forming a light reflecting surface of the recording member.
The reflected light is reflected by CL, and the reflected light is transmitted through the charge holding layer IL in the recording member D, the optical member PML that changes the light state according to the intensity distribution of the applied electric field in the detection head RA, and the transparent electrode Et. And is emitted from the transparent electrode Et.

As described above, the detection head RA includes the transparent electrode Et and the light modulation material layer member PML {a light modulation material layer member PML (for example, a light modulation material layer member PML exhibiting characteristics such that the state of light can be changed by an applied voltage).
Lithium niobate single crystal having an electro-optic effect, or bismuth silicate oxide, or a material layer for light modulation such as a layer of nematic liquid crystal exhibiting an electric field scattering effect may be used)}. However, since the electric field due to the charge image held in the charge holding layer IL of the recording member D is applied to the light modulation material layer member PML in the detection head RA, the birefringence in the detection head RA is as described above. The laser light flux incident on the light modulation material layer member PML made of a material is in a state of normal light and abnormal light generated at the light modulation material layer member PML made of a birefringent material according to the electric field generated in the charge image ( In the case of this example, the angle of the plane of polarization changes.

Then, as described above, the laser light flux incident from the transparent electrode Et side of the detection head RA passes through the light modulation material layer member PML, then exits from the detection head RA and enters the recording member D, and the electric charge in the recording member D is increased. After passing through the holding layer IL, it is reflected by the electrode CL forming the light reflecting surface of the recording member, and the reflected light is again charged in the charge holding layer IL of the recording member D.
The light emitted from the surface of the transparent electrode Et after passing through the light modulation material layer member PML in the detection head RA has its light state changed corresponding to the potential distribution of the charge image in the recording member D. It has become a thing.

Then, the light emitted from the detection head RA is reflected by the beam splitter 4, and then transmitted through a wave plate 5 for adjusting the amount of light, which is provided as necessary, and then is incident on an analyzer 6, and The light transmitted through the analyzer 6 is converted into an electric signal by the photoelectric converter 7.

The information signal recording / reproducing apparatus according to the present invention as described above uses the detection head RA constituted by laminating the transparent electrode Et and the light modulation material layer member PML, and also uses the detection image RA as the recording member D. A charge holding layer IL made of a material having a holding function and capable of transmitting read light used for reading a held charge image is formed on the electrode CL forming a light reflecting surface on the substrate BL. Since the laser beam incident on the detection head RA passes through the light modulation material layer member PML and the charge holding layer IL of the recording member D as described above, The reflected light is reflected 100% by the electrode CL forming the light reflecting surface, and the reflected light is again stored in the charge holding layer IL of the recording member D.
Since the light passes through the light modulation material layer member PML in the detection head RA and is emitted from the surface of the transparent electrode Et, the surface potential of the recording member can be detected with high sensitivity.

(Effects of the Invention) As is clear from the above description, the information signal recording / reproducing apparatus according to the present invention has a charge image holding function and is capable of reading a held charge image. Information to be recorded by using a recording member in which a charge holding layer made of a material capable of transmitting the read light used is formed on an electrode forming a light reflecting surface of a substrate. An information signal recording / reproducing apparatus using a charge image for recording / reproducing a signal, wherein reading is performed on one of two opposing surfaces of an optical member that changes a light state according to an intensity distribution of an applied electric field. A means for arranging the other surface, from which the reading light flux is emitted, in the detection head provided with the transparent electrode to which the light flux is incident, in such a manner as to face the recording member to be reproduced. A means for causing a reading light flux to enter from the transparent electrode side of the detection head, and a means for causing the reading light flux emitted from the detection head to enter the charge holding layer of the recording member and transmitting the charge holding layer of the recording member, Means for reflecting the reading light flux transmitted through the charge holding layer of the recording member by the electrode forming the light reflection surface of the recording member, and the reflected light of the reading light is applied to the charge holding layer of the recording member and the detection head. Means for transmitting the optical member and the transparent electrode that changes the state of light according to the intensity distribution of the electric field, and the light emitted from the transparent electrode is given to the photoelectric converter through an analyzer, and the photoelectric converter described above is provided. Since the information signal recording / reproducing apparatus according to the present invention is provided with a means for photoelectrically converting the information, the information signal recording / reproducing apparatus according to the present invention can detect the information signal. As a counter electrode of the electrode Et of the head RA, a charge holding layer IL made of a material that has a function of holding a charge image and can transmit read light used for reading the held charge image is formed. substrate
The reading light is stabilized by using the mirror-like electrode CL of the recording member that is configured on the electrode CL that forms the light reflection surface in BL, and by making the electrode CL reflect 100% of the reading light. Detection head
Since it is possible to lead to RA, and therefore the charge image of the recording member D can be detected with high sensitivity, the present invention can satisfactorily solve the above-mentioned conventional problems.

[Brief description of drawings]

The accompanying drawings are block diagrams of an embodiment of a recording / reproducing apparatus for information signals by means of a charge image according to the present invention. 1 ... Laser light source, 2 ... Lens, 3 ... Polarizer, 4 ... Beam splitter, 5 ... Wave plate, 6 ... Analyzer, 7 ... Photoelectric converter, RA ... Detection head, D ... Charge image detection should be performed Recording member, Et ... Transparent electrode, PML ... Light modulation material layer member, CL ...
An electrode that forms a light reflecting surface, IL ... A charge holding member that has a function of holding a charge image and that is made of a material that can transmit read light used for reading the held charge image Layer, BL ... Substrate,

Front page continued (72) Inventor Asakura Den, 3-12 Moriyamachi, Kanagawa-ku, Kanagawa, Japan Victor Company of Japan, Ltd. (72) Masato Furuya 3-12 Moriya-cho, Kanagawa-ku, Yokohama, Japan Victor Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A light-reflecting surface on a substrate having a charge holding layer made of a material having a function of holding a charge image and transmitting read light used for reading the held charge image. A recording / reproducing apparatus for an information signal by a charge image, in which an information signal to be recorded is reproduced by using a recording member configured on an electrode forming a The other surface of the optical member that changes the state of light according to the one of the two surfaces facing each other is provided with a transparent electrode to which the reading light flux should be incident, and the other surface from which the reading light flux is emitted is reproduced. Means for arranging so as to face the recording member of interest, means for making the reading light flux incident from the transparent electrode side of the above-mentioned detection head, and the above-mentioned detection head A means for causing the emitted reading light flux to enter the charge holding layer of the recording member and transmitting the charge holding layer of the recording member, and a reading light flux for transmitting the reading light flux that has passed through the charge holding layer of the recording member, the light reflecting surface of the recording member. The means for reflecting the light by the electrodes, the light holding layer in the recording member and the optical member for changing the light state according to the intensity distribution of the applied electric field in the detection head and the transparent electrode are transmitted. And a device for giving light emitted from a transparent electrode to a photoelectric converter through an analyzer and performing photoelectric conversion by the photoelectric converter.