JPH02173670A - Photocopying device - Google Patents

Abstract

PURPOSE:To shorten the time required for copying operation by applying an electrical field to pockels read-out memory crystal and copying an image through the use of the variation in transmissivity due to the incidence of ultraviolet rays. CONSTITUTION:When an original paper 6 reaches an exposure point 17, an exposing process starts here. The pockels read-out memory crystal, this is PROM crystal 3 produces the distribution of a transmission rate zero by the incidence of ultraviolet rays from a laser oscillator 1 to which a voltage is applied from electrodes 2 and 4. Primary light 11 from the laser oscillator 1 generates a secondary high-frequency generating element, that is a SHG 5 secondary high-frequency (ultraviolet ray) and a character pattern on the original paper 6 is recorded. A PROM drum keeps revolution. When an exposed part reaches a transfer point 18, the character pattern is recorded on a transfer paper. The PROM drum further continues to revolve and contents recorded on the crystal 3 are erased with an eraser 9 so that the operation is ready for fresh exposure. The transfer paper 7 moves away from the PROM drum point 18 and is developed by a developing unit 8. Therefore, since no conventional electrification process is required, the copying time is thus shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical copying apparatus, and more particularly to an optical copying apparatus that uses light to reduce the number of copying processes and shorten the copying time.

[Conventional technology]

Conventionally, as an optical copying device, a copying device applying the principle of xerography has been devised.

FIG. 4 is a block diagram of a conventional optical copying apparatus. The optical copying apparatus shown in Fig. 4 consists of a cylindrical aluminum tube coated with a film of an organic photoreceptor (○PC).
An electrostatic charging electrode 22. Exposure light source 23. Arrange transfer device 24 and eraser 25, ○PC
The drum 21 is always rotated at a constant speed in the direction of an arrow 29. The electrostatic charging electrode 22 charges the surface of the 020 to a constant electrostatic potential, and this portion reaches the exposure light source 23 as the OPC drum 21 rotates.

Here, the reader 27 reads the characters on the base paper 26, converts them into electrical signals, and controls the exposure light source to shine in the shape of the characters. However, in OPC, the electrostatic potential changes only in the exposed portion, so the electrostatic potential changes in the shape of a character. The OPC drum 21 continues to rotate further and reaches the transfer device 24 portion. Here, ink 30 is applied to the OPC drum 21. Due to the difference in electrostatic potential, the ink 31 comes to adhere to the character-shaped portion of the oPC drum 21. Therefore, by pressing the transfer paper 28 against this, characters can be transferred onto the transfer paper 28. The OPC drum 21 continues to rotate, and the eraser 25
This erased all static electricity on the surface and prepared for the next charging.

[Problem to be solved by the invention]

The above-mentioned conventional optical copying apparatus requires four processes of charging, exposure, transfer, and erasing, as well as a reading section, so there are problems in that the copying speed is slow and the cost of the apparatus is high.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the number of processes in the conventional optical copying apparatus described above, and to provide an optical copying apparatus that has a high copying speed and is inexpensive.

[Means to solve the problem]

The optical copying apparatus of the present invention scans a subject surface with light to read an image on the subject surface, exposes the image onto a transfer paper, develops it, and makes a copy. shaped Bockels readout memory (Poc
kels Read Out Memory) crystal,
A first transparent electrode and a second transparent electrode are attached to the inner and outer surfaces of the Bockels lead-out memory crystal, respectively, and to which a first voltage and a second voltage are applied to the Bockels lead-out memory crystal. (B ) an eraser that initializes the Bockels lead-out memory crystal; (C) a developer that develops the exposed transfer paper; It is configured to perform copying by irradiating the exposure surface and the copying surface, which are points.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. The optical copying apparatus shown in FIG. 1 includes a cylindrical Bockels lead-out memory crystal (hereinafter referred to as FROM crystal toy) 3, transparent electrodes 2 and 4 attached to the inner and outer surfaces of the PROM crystal 3, respectively. A second harmonic generation element (Second Harmonic Gene) is attached to the outer side of the transparent electrode 4 on the outer surface side of the PROM crystal 3.
(hereinafter referred to as SHG) 5, and two points separated from each other on the surface of the PROM drum are set as an exposure point and a copying point, respectively, and are installed inside the PROM drum, and a Laser oscillator 1 that emits red laser light and transparent electricity! ! A DC power supply 10 that applies a voltage between 2 and 4, an eraser 9 that initializes the PROM crystal 3, and a developer 8 that displays the copied latent image.
It is composed of.

FIGS. 2 and 3 are explanatory diagrams of a copying operation using a part of the cross section of the PROM drum used in the present invention.

Next, the operation will be explained. First, the principle of copying will be explained using FIGS. 2 and 3, and then the process of copying will be explained using FIG.

First, the operation of the PROM crystal 3 will be explained with reference to FIG.

PROM crystal 3, due to the voltage applied across it,
An electric field is applied inside it. When ultraviolet light is incident here, electron-hole pairs are generated due to the photoconduction effect,
Charge movement occurs to cancel the electric field. As a result,
An electric field distribution occurs in the crystal depending on the input pattern,
This distribution appears as a transmittance distribution due to the electro-optic effect. In the present invention, the transmittance of the part through which the ultraviolet light passes is O
, otherwise it is 1 (i.e. transparent state)
It is assumed that a PROM crystal 3 is used. or,
By erasing with the eraser 9, the transmittance of the portion where the transmittance is 0 can be returned to 1.

Based on the above explanation, the exposure process will be explained with reference to FIG. In FIG. 2, the base paper 6 on which the characters 13 to be copied are written is pressed against the surface of the 5HG 5. Next, 1
Secondary light 11 (red laser light) is incident on the transparent electrode 2 from the right side. The primary light 11 passes through the electrode 2, the PROM crystal 3, and the electrode 4, and enters the SHG 5. 5HG5
generates a second harmonic (ultraviolet light) with respect to the incident primary light 11, which hits the base paper 6. Here, character 1
The second harmonic that enters where 3 is written will be absorbed, but if it is a white background, it will be reflected, and the reflected second harmonic, which is ultraviolet light, becomes secondary light 12 and travels the opposite optical path. I will be going back. Here, if 5HG5 is selected that does not have a second harmonic generation function for ultraviolet light, this secondary light 12 will pass through SHG 5 and also pass through electrode 4. , enters the PROM crystal 3. As mentioned above, P
The ROM crystal 3 has a transmittance of 0 for red light due to the incidence of ultraviolet light, so as a result of the above, there is no reflection from the character portion of the base paper 6, so the transmittance here is 1. Since ultraviolet light is reflected from a white background, the transmittance here is 0.

In other words, a distribution of transmittance O occurs according to the character pattern of the base paper 6. This completes the exposure process.

Next, the transfer process will be explained with reference to FIG. In the exposure process, the base paper 6 is replaced with the transfer paper 7 in the PROM crystal 3 on which the transmittance distribution according to the character pattern is recorded, and the primary light 11 used in the exposure process is used in the same manner as in the exposure process. When it is made incident, the primary light 11 is transmitted only where it hits the letters on the base paper 6 in Fig. 2, and is incident on 5HG5.
The transfer paper 7 is irradiated with ultraviolet light, which is the second harmonic. In other words, a portion of the transfer paper 7 that is exposed to light is created in the shape of a character. This concludes the explanation of the transfer process.

Next, based on the above description, the copying process will be explained using FIG. 1. As shown in FIG. 1, a cylindrical configuration of two electrodes 2, 4, PROM crystal 3, and SHG 5 is used as a PROM drum, and is constantly rotated at a constant speed in the direction of arrow 14. Further, the original paper 6 and the transfer paper 7 also move in the directions of arrows 15 and 16, respectively, in synchronization with the PROM drum. However, the base paper 6 contacts the PROM drum at an exposure point 17 on the PROM drum, and the transfer paper 7 also contacts the PROM drum at a transfer point 18. In addition, primary light 11 is emitted from a laser oscillator 1 installed inside the PROM drum.
is incident toward the exposure point 17 and the transfer point 18.

Next, the operation will be explained. When the base paper 6 reaches the exposure point 17, the exposure process starts here, so that the PRO
The character pattern on the base paper 6 is recorded inside the M crystal 3. The F ROM drum continues to rotate, and the exposed part
When the transfer point 18 is reached, the character pattern is now recorded on the transfer paper. The PROM drum continues to rotate,
The contents recorded in the PROM crystal 3 are erased by the eraser 9 and prepared for new exposure. - side, the transfer paper 7 is away from the transfer point 18 of the PROM drum, and the developing device 8
Developed at When the above process is completed for the entire base paper 6, copying is completed.

〔Effect of the invention〕

Since the optical copying apparatus of the present invention does not require a charging process compared to conventional copying apparatuses, it has the advantage that the number of processes is reduced by one and the copying time is shortened.

Furthermore, since a reading section is not required, the time from reading to exposure is significantly shortened, and the cost of the apparatus can be kept low.

[Brief explanation of the drawing]

1 is an explanatory diagram showing the configuration of an embodiment of the present invention, FIG. 2 is an explanatory diagram illustrating the exposure operation of the embodiment of FIG. 1, and FIG. 3 is an explanatory diagram of the transfer operation of the embodiment of FIG. 1. FIG. 4 is an explanatory diagram showing the configuration of a conventional optical copying apparatus. 1... Laser oscillator, 2... Electrode, 3... FRO
M crystal, 4... Electrode, 5... SHG, 6... Base paper, 7... Transfer paper, 8... Developer, 9... Eraser, 10... Power supply, 11...・Primary light, 12...Secondary light, 13...Character, 14-16...Arrow, 17...
・Exposure point, 18...Transfer point, 21...○PC drum, 22...Electrostatic charging electrode, 23...Exposure light source, 24
...Transfer device, 25...Eraser, 26...Base paper,
27...Reader, 28...Transfer paper, 29...Arrow,
30...Ink.

Claims (1)

[Scope of Claims] An optical copying apparatus that scans a subject surface with light to read an image of the subject surface, exposes the image onto a transfer paper, and then develops and copies the image, comprising: (A) a cylindrical type; Pockels Lead Out Memory (Poc)
kelsReadOutMemory) crystal, and a first transparent electrode and a second transparent electrode that are respectively attached to the inner and outer surfaces of the Pockels readout memory crystal and to which a first voltage and a second voltage to be applied to the Pockels readout memory crystal are applied. a transparent electrode, a second harmonic generation element attached to the outside of the second transparent electrode, and a laser oscillator provided at the center of the cylindrical shape and outputting red laser light. (B) an eraser that initializes the Pockels lead-out memory crystal; (C) a developer that develops the exposed transfer paper; 1. An optical copying apparatus characterized in that the optical copying apparatus is configured to perform copying by irradiating two points, an exposure surface and a copying surface.