JPS63307480A - Copying device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying apparatus using a photoreceptor sheet.

[Prior Art] Conventionally, in a copying apparatus using a photoreceptor sheet, such as that disclosed in Japanese Patent Application Laid-Open No. 61-77866, there has been an exposure method in which the photoreceptor sheet is exposed to light reflected from an original document.

[Problems to be Solved by the Invention] However, in the above method, a sufficient amount of light (energy) is required to expose the photoreceptor sheet, so the light source device becomes large and the power supply becomes large accordingly.
Furthermore, in order to perform color copying, it was necessary to use a special photoreceptor sheet that had been dye-sensitized by mixing dyes into the photoreceptor so that it would be exposed to red, green, and blue light, for example.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and the light source device and power source can be relatively small.
Furthermore, the present invention provides a copying apparatus that can perform color copying without using a special photoreceptor sheet.

[Means for Solving the Problems] In order to achieve this object, the copying apparatus of the present invention includes a photoconductor having photochromic properties on which light from an original is projected and whose light transmittance changes, and this photoconductor. The present invention includes an exposure lamp that emits light in a wavelength range to which the photoreceptor has no sensitivity, for exposing the photoreceptor sheet to light through the photoreceptor sheet, and an erasing device for erasing the margins formed on the photoreceptor.

[Function] In the present invention having the above-described configuration, the image on the original is once recorded on the photoreceptor, and then the photoreceptor sheet is exposed to light through this photoreceptor. An image is copied onto a photoreceptor sheet.

[Embodiment] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, a document 7 is placed on a document table 6 of a copying device 5. As shown in FIG. Further, below the document table 6 of the copying device 5, an endless photosensitive belt 8 containing photochromic properties is supported so as to be movable clockwise by two drums 9 and 10 located at a distance from each other on the left and right sides. There is. The first light source 11 is arranged under the document table 6 and irradiates the document 7 with light. The reflected light from the original 7 is imaged onto the photosensitive belt 8 via a condensing lens (dot lens array) 12 .

The document table 6 is movable to the right in FIG. 1 in synchronization with the movement of the photosensitive belt 8.
As the emission wavelength of the photosensitive belt 8, a wavelength matching the sensitivity wavelength of the photoreceptor belt 8 is selected.

The second light source 13 is connected to the conveying drum 1 via the photosensitive belt 8.
02, and the photosensitive book sheet 103 moves in synchronization with this conveyance drum 102.

The emission wavelength band of this second light source does not match the sensitivity wavelength of the photoreceptor belt 8, and a wavelength band that matches the sensitivity wavelength of the photoreceptor sheet 103 is selected. Around this conveyance drum 102, there is a paper feed roller 101, a charger 104, and a developer 10.
9, a developing counter electrode 110, a modern liquid tank 111, a metal conductive doctor roller 112 to which a voltage can be applied by a power source, an air blowing nozzle 113, a discharge roller 114, and a static eliminator 115 are arranged.

In the copying apparatus configured as described above, light emitted from the first light source 11 is reflected by the original 7 and focused by the condenser lens 12 onto the photosensitive belt 8 having photochromic properties. Photochromic properties are a property in which there is a reversible change between substance structure A and substance structure B due to light.
This change is a phenomenon accompanied by a change in absorption spectrum, that is, a change in color.

The transformation from structure B to structure A progresses by leaving the structure in the dark, but it is accelerated by applying external energy such as heat or light of a different wavelength.

Now, when an image is formed on the photoreceptor belt S which has the characteristic that it is in a colored state in the structure A state and changes to a colorless and transparent state in the structure B state upon exposure, the bright part of the document 7 is colorless on the photoreceptor belt. Since the transparent dark portions of the original 7 remain colored on the photosensitive belt 8, an image of the original 7 is formed on the photosensitive belt 8.

On the other hand, the photoreceptor sheet 103 is supplied to and held on the surface of the transport drum 102 by the paper feed roller 101. As the transport drum 102 rotates, the photoreceptor sheet 103 is first subjected to an initial corona discharge in a charger 104 and is uniformly charged. Next, an electrostatic latent image corresponding to the image on the photosensitive belt 8 is formed on the photosensitive layer of the photosensitive sheet 103 by the second light source 13, and then a developing counter electrode]1
The image is developed with a developing device 109 to which a predetermined potential is applied to make it visible.

Next, the visualized photoreceptor sheet 103 is transferred to a metal conductive roller 112, which removes a large amount of developer adhering to the surface of the photoreceptor layer to a level higher than the residual potential of the non-image area. A voltage having a polarity different from that of the toner particles is applied to condition the skin while removing residual toner particles in the surplus developer, and also remove a portion of the surplus developer. After that, photoreceptor sheet 1
03 is sent to the air blowing nozzle 113, and the carrier liquid remaining on the surface of the sheet is drained to a predetermined amount without disturbing the toner layer in the printing section, and then is discharged from the paper discharge port 114. Ru.

If the photosensitive belt is moved and a new photosensitive sheet is overlapped and exposed without moving the erasing device 17, a plurality of copies can be made by exposing the original 7 once.

As described above, in this embodiment, since the photoreceptor sheet 103 is exposed by the second light source 13 in a state where it is overlapped with the photoreceptor belt 8, the second light source 13 may be relatively small.

Furthermore, the photoreceptor belt 108 in the above-described embodiment is made of a thionine compound, which is an organic substance, and is made of a photochromic substance that is colorless and transparent in the structure A state and changes to a colored state in the structure B state upon exposure to light. You may.

FIG. 2 shows a second embodiment of the present invention, in which a color copying machine is used.

In addition, during the description, the same numbers are given to the same parts as in each of the above-mentioned embodiments. In the figure, the color separation filter is
It is arranged between the condenser lens 12 and the belt-shaped photoreceptor 30.

Three sets are prepared for magenta and yellow.

In the above configuration, when exposure is performed with the color separation filter 31 set to red, the belt-shaped photosensitive tree 30
A hidden city corresponding to the color red is formed above. At this time, cyan toner is developed in the developing section of the photoreceptor sheet 103. Next, the color separation filter 31 is set to green to develop magenta, and set to blue to develop yellow. Color copying of the photoreceptor sheet is completed by repeating the development three times.

[Effects of the Invention] As is clear from the detailed description above, the present invention provides a photoreceptor having photochromic properties in which the light transmittance changes when light from an original is projected, and this photoreceptor. Equipped with an exposure lamp that emits light in a wavelength range to which the photoreceptor is insensitive for exposing the photoreceptor sheet to light through the photoreceptor, and an erasing device for erasing defects formed on the photoreceptor. The light source device and the power source can be made smaller than those of the prior art, and a color copying machine can be configured without applying any special treatment to the photoreceptor sheet.

[Brief explanation of drawings]

1 and 2 show an embodiment embodying the present invention, FIG. 1 is a drawing showing a copying apparatus of the invention, and FIG. 2 is a drawing showing another embodiment. . 5 Copying device 7 Original 8 Photosensitive belt 11 First light source 13 Second light source 103 Photosensitive book sheet 109 Developing device

Claims (1)

[Scope of Claims] An electrostatic latent image is formed on a photoreceptor sheet having a photoconductive layer on a conductive support, and then developed with a developer having toner particles dispersed in an electrically insulating medium. A copying device that sequentially superimposes toner images includes a photoreceptor having photochromic properties whose light transmittance changes when light from an original is projected, and a photoreceptor for exposing the photoreceptor sheet to light through this photoreceptor. A copying apparatus comprising: an exposure lamp that emits light in a wavelength range to which a body is insensitive; and an erasing device for erasing an image formed on the photoreceptor.