JPS6035054B2 - copying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention enables positive → positive original image, negative ← → without changing the polarity of the developer and each charger in the xerographic process.
It relates to a copying device that can freely select a positive original image, and more specifically, a copying device that temporarily records a subject image in a pattern formed by specular reflection and light scattering reflection on an intermediate recording medium with a mirror surface, and records obtained in this way. By selectively using either immediately reflected light or diffuse reflected light from the image illumination light source (without changing the charging polarity of each step of the xerographic process), negative←→positive images, or The present invention relates to a copying apparatus that can obtain a positive->positive image.

Possible methods based on the conventional technology include a method in which two types of developer are prepared, one that is positively charged and one that is negatively charged, and development is performed by changing the transfer polarity.
By preparing a photoreceptor or other bipolar photoreceptor with a type semiconductor bonded to it, or a transparent dielectric material bonded to one of the semiconductors, and switching the charging polarity and polarity of the photoreceptor between positive and negative, the same polarity can be obtained. There is a method of performing normal development or reversal development using a developer to obtain a negative←→positive or positive→positive image.

However, the former method requires two developing devices, and the latter method has disadvantages in terms of polarity switching, image quality, cost, etc., and has not been put into practical use. An object of the present invention is to provide an electronic copying apparatus that can easily obtain negative←→positive images and positive→positive images without changing the charging polarity of each step of the xerographic process.

Still another object is to provide an electronic copying apparatus that can correct, erase, and combine images by superimposing two objects.

As shown in FIG. 1, the present invention is an electronic copying apparatus consisting of an enlargement copying system 2 and a full-size copying system 3, in which an intermediate recording medium 15 is placed on the optical axis of each system, and the contents of the intermediate recording are recorded. It is equipped with a light source 16 for reading, a lens zoomer 8, and a half mirror 17 for reading directly reflected light.

First, to explain the enlarged copying system, the subject film 1
2 is projected by a projector 11, and its optical image passes through a lens 13, is reflected by a mirror 14, and is transferred to an intermediate recording medium 15.
The contents of the film 12 are intermediately recorded.

The intermediate recording medium is composed of a photoconductive photosensitive layer such as ZnSe or Se that has a mirror surface like a metal surface when viewed from the light source 16 side, and a light scattering forming layer such as liquid crystal, thermoplastic, or PUT that causes light scattering when irradiated with light. This is a sandwich type cell that includes a scattering reflection layer between transparent electrodes. The content recorded on such an intermediate recording medium is read by the reading light source 16.
An optical system (
(see Figure 4a), and once the light from the light source 16 is transferred to the half mirror 1.
7 and illuminates the recording medium 15 from below, reads the directly reflected light, and projects it onto the photosensitive material 6 via the lens 18 (see FIG. 5a). . The film image projected by the projection lens 13 is intermediately recorded on an intermediate recording medium 15, and for the sake of explanation, a liquid crystal is used as the intermediate recording medium, and its structure is shown in FIG.

In FIG. 2, a liquid crystal cell 10 has a structure in which a photosensitive material layer, for example, a ZnSe thin layer 103 having a thickness of 0.1 mm or less, and a liquid crystal layer 104 are sandwiched vertically by a glass layer 101 and a transparent electrode 102. There is.

The transparent electrode 102 is made of, for example, indium oxide ln203, and a photoconductive photosensitive material, such as ZnS, is coated on this transparent electrode.
A thin ZnSe layer 103 is formed by vapor-depositing ZnSe, and light from a light source 16 is reflected by three mirror surfaces of the ZnSe thin layer. The liquid crystal composition of the liquid crystal layer 104 may be a known one, for example, M old BA (p-methoxybenzylidene n-butylaniline) 46%, EBBA (p-ethoxybenzylidene n-butylaniline) 31%, PEBAB.
A liquid crystal consisting of 13% (p-ethoxybenzylidene p'-aminobenzinitrile) and 10% COC (cholesteryl oleyl carbonate) can be used. These liquid crystals are preferable because they have excellent sustainability in image recording. When a voltage is directly applied 4 to the liquid crystal layer 104, the orientation of the liquid crystal molecules changes, for example, from a transparent state to a cloudy state, thereby scattering incident light. If this film image is negative, the character part of the negative film, that is, the part that is hit by the light (h), causes light scattering and becomes cloudy 31 (see FIG. 3). That is, in the present invention, the intermediate recording medium has a characteristic that a pattern can be formed by a portion having a mirror surface 32 and a portion 31 that causes light scattering. According to the liquid crystal cell shown in FIG. 2, when a bias voltage is applied to the transparent electrode 102, ZnSe becomes conductive in the irradiated portion a, so that a bias voltage is applied directly to the interface between the ZnSe layer and the liquid crystal. is applied, and the liquid crystal layer becomes cloudy.

On the other hand, in the portion b that is not irradiated with light, since ZnSe is insulating, no voltage is directly applied to the interface between the ZnSe layer and the liquid crystal, and therefore the liquid crystal layer remains in a transparent state.

The liquid crystal having the above composition is a liquid crystal called a memory type liquid crystal, and even when the bias voltage of the liquid crystal layer 104 is turned off and light irradiation is stopped, the cloudy part and the transparent part of the liquid crystal layer are maintained, and a desired pattern can be formed. It will be recorded. Next, the content recorded on the intermediate recording medium is further read by the light source 16.
Here, the light is illuminated at an angle of 8 with respect to the surface of the intermediate recording medium depending on the light scattering state of the intermediate recording medium.
When illuminated with a cloudy area (as shown in Figure 4a),
The shaded area 31) causes light scattering and causes light to enter the reading lens 18, while areas other than the cloudy area (mirror surface area 32) are totally reflected in the dropwise direction.

Therefore, the light amount distribution on the photoreceptor 6 by the reading lens 18 is as shown in FIG. 4b. Further, when the light from the light source 16 is perpendicularly illuminated onto the surface of the intermediate recording medium through the collimating lens 21 and the half mirror 17, the cloudy part 31 causes light scattering, as shown in FIG. 5a, and the mirror surface part 32
The directly reflected light passes through the lens 18, and the light amount distribution on the photoreceptor 6 due to the reading lens 18 is as shown in FIG. 5b.

When the light quantity distributions in both cases are superimposed, the combined light quantity distribution becomes as shown in FIG. Of course, in this case the mirrors 5a, 5b are removed from the illumination light. Here the 6th
As shown in the figure, there is a difference in the amount of DC component flowing through the photoreceptor between the case of illumination with diffused light and the case of vertical light (direct light). need to be brought down to the level of the department. The filter 22 is provided for this purpose, and is suitable as long as it has an appropriate transmittance and can correct the amount of light irradiated onto the intermediate recording medium in addition to correcting the level of the DC component. , an ordinary aperture device may be used, or the light amount may be adjusted by directly changing the voltage of the light source 16. Furthermore, if the cloudy part has a certain degree of directionality, such as in a liquid crystal, a method of diagonally illuminating the light using a lens system as shown in FIG. 7 and picking up the directly reflected light can of course be adopted.

In addition to directly exposing the original image onto the intermediate recording medium, methods for forming the optical pattern on the intermediate recording medium include:
A pulse signal corresponding to the image, for example, a pulse signal from a computer or facsimile, or scanning by an electron beam of a CRT or the like may be used.

As described above, the photoreceptor 6 used in the copying process for producing the final copy of the optical pattern formed on the intermediate recording medium according to the present invention is an electrophotographic photoreceptor. It goes without saying that a photoreceptor of type photoreceptor or a photoreceptor of diazo type may be used.

An embodiment of the present invention will be described below with reference to FIG.
An obake document (opaque negative original) 20 placed on the platen of the isometric copying system 3 is illuminated by a light source 19, and the reflected light passes through a mirror 5c, a lens 4, and a mirror 5b (dashed line) to a liquid crystal cell. The contents of the obake document are projected onto the intermediate recording medium 15.

Immediately after or at the same time, the contents of the microfilm 12 of the enlargement copying system 2 are transferred to the project lens 13 and the mirror 14.
The images may be recorded on an intermediate recording medium in a superimposed manner. In the case of overlapping recording, either the image recorded on the opaque document 20 or the microfilm 12, or both images must be negative images. The image thus created on the liquid crystal cell intermediate recording medium is a cloudy positive image, consisting of a light source 16, a half mirror 17, and a lens 1.
Directly reflected light is projected onto the uniformly charged photoreceptor 6 by a reading optical system consisting of 8. The resulting electrostatic latent image on the photoreceptor is a positive image, which is developed by a positive developer 8 and then transferred onto a transfer paper 101. In this way, a positive copy is finally obtained from the negative original. The copying apparatus of the present invention can also be used as a normal copying machine without using an intermediate recording medium. That is, when performing normal positive-to-positive copying, the contents of the positive bake document 20 read by the lens 4 are reflected by the mirror 5a (dotted line) and projected onto the photoreceptor 6, and then copied using the normal electronic copying method. Developed and fixed. Here, the half mirror 17, mirror 5a, and mirror 5b are positioned so as not to interfere with each other during use. If thermoplastic or the like is used as the intermediate recording medium, which is transparent only in the area hit by light, either or both of the original for full-size copying and the original for enlarged copying is made into a positive image.

Also, when writing on both sides of an intermediate recording medium, depending on the type of photosensitive material of the intermediate recording medium, it is necessary to switch the bias polarity on the light irradiation side to positive or negative. A junction type semiconductor (one side of which is semitransparent, such as a ZnSe thin film with a thickness of 0.1 μm or less) may be used. The copying apparatus shown in Fig. 1 combines the optical systems of a microprinter as an enlargement copying system and a 1x printer as a 1x copying system.
By interposing an intermediate recording medium in which a pattern is formed by a mirror surface and a portion that causes light scattering, direct reflected light or diffuse reflected light is selected from the intermediate recorded contents, and a desired negative or positive image can be produced by a copying machine. can be obtained without changing the developer and the polarity of the charging system.

The advantages obtained by the copying apparatus of the present invention are as follows.

1. A positive image can be obtained from a negative film, a positive film, or a positive or negative baked document without changing the polarity of the developer and charging system of the copying machine.

2. It is possible to obtain a copy by superimposing the film image and the content of the obake document.

3. For example, since a positive image can be obtained by combining a micro printer and a full-size printer in the same development system, it is possible to design a micro/o-bake printer that has both functions.

[Brief explanation of the drawing]

1 shows an embodiment of the present invention, FIG. 2 is a block diagram of an intermediate recording medium according to the present invention, FIG. 3 is a block diagram of an intermediate recording medium comprising a mirror surface and a cloudy part, and FIG. 4a shows a block diagram of an intermediate recording medium according to the present invention. FIG. 4b is a diagram showing the optical system at this time, and FIG. 5a is a diagram showing the state in which an image on the intermediate recording medium is read using light scattered and reflected. FIG. Figure 5b is a diagram showing the light intensity distribution at this time, and Figure 6 is a diagram showing the light intensity of the image on the intermediate recording medium in the case of scattered reflected light and in the case of direct reflected light. This is a comparison diagram, and FIG. 7 is a diagram showing a modification of FIG. 5. Codes in the figure 1... Copy machine, 2... Enlarged copy system, 3...
...Full size copy system, 4...Full size lenses, 5a, 5b...
・Mirror, 6... Photoreceptor, 7... Charged corotron,
8...Developer, 9...Transfer corotron, 10...
Transfer paper, 11... projector, 12... film,
13...Project lens, 14...Mirror, 15.
...Intermediate recording medium, 16...Reading light source, 17...
・Half mirror, 18...reading lens, 19...
・Reading light source, 20...Obake document, 21...
Collimator lens, 22... Filter, 23... Screen, 31... Cloudy part, 32... Mirror surface part, 100... Liquid crystal cell, 101... Glass, 102... Transparent electrode, 103.
...Photosensitive material, 104...Liquid crystal. Figure 1 Figure 2 Figure 3 Figure 4a Figure 4b Figure 5a Figure 5b Figure 6 Figure 7

Claims (1)

[Claims] 1. In a copying device that creates a normal image or a reversed image copy from a single or multiple original images, a light scattering/reflection system consisting of a specular reflection layer made of a photoconductive photoreceptor and a light scattering forming layer that causes light scattering upon irradiation with light. an intermediate recording medium having a layer arranged between transparent electrodes and capable of forming an optical pattern by irradiating a light image; an optical pattern corresponding to the original image is formed on the intermediate recording medium from the single or plural original images; A copying system comprising a means, an optical system for extracting a specular reflection pattern or a light scattering reflection pattern from the intermediate recording medium as an optical image, and a copying system for creating a copy from the single or combined optical image thus obtained. Device.