JPS62203176A - Copying machine - Google Patents

Abstract

PURPOSE:To obtain many variable-magnification copies of the same original image on one sheet of recording paper without increasing the number of copy sheets by providing a means which forms the latent image of at least one original and exposing the same photosensitive medium to it plural times and a means which visualizes the latent image. CONSTITUTION:The original 1 mounted on an original platen is lighted by an illumination lamp to form the electrostatic latent image on a photosensitive medium as an electrophotographic sensitive body provided around the peripheral surface of a drum by an optical system which includes the 1st mirror 21, the 2nd mirror unit 22, parallel provided lenses L1-L3 of an image formation system, and the 3rd mirror. Original images of the whole original which have (m)X magnification are formed as a latent image on the photosensitive medium 25 which rotates at a rotational peripheral speed mV through the lenses L1, L2, and L3. This latent image is developed by a developing device 26 to obtain a visual image (toner image). This visual image is transferred by a transfer electrode 27 to recording paper P sent out of a paper feed cassette 30 which contains sheets of recording paper of different size. Consequently, plural fine images of the same original are obtained by single-time copying operation and the operation time of copying operation is shortened.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves irradiating an original, exposing an image on the original onto a photosensitive medium such as an electrophotographic photoreceptor using an exposure means to form a latent image, and then developing the image. The present invention relates to a copying apparatus which makes an image visible by means of means.

[Conventional technology]

As copying devices are increasingly used in office departments, their types tend to become more diverse. In general, RPC is the mainstream, but even within the same RPC, color copying devices have come to appear in addition to monochrome copying devices. In addition, regarding copying magnification, in addition to the 1:1 constant magnification, variable-magnification copying devices that are capable of reducing and enlarging documents have come into widespread use.

[Problem that the invention seeks to solve]

In general administrative departments, it is often necessary to reduce the original image and make many copies thereof. At this time, it is common practice to make a large number of reduced copies, but when the reduction ratio is particularly high, there is a lot of blank space on the recording paper, resulting in a lot of waste. The object of the present invention is to provide a copying apparatus capable of producing multiple variable-reduction copies of the same original image on one sheet of recording paper without increasing the number of copies.

[Means for solving problems]

The present invention is an object of the present invention to solve the above-mentioned problems.It is an object of the present invention to provide a copying apparatus that exposes an original to light and copies an image on the original onto a photosensitive medium, in which at least one original is used as a latent image on the same photosensitive medium. This is achieved by a copying apparatus characterized by having means for exposing a plurality of latent images, and means for developing the latent image.

〔Example〕

As a first embodiment of the present invention, FIG. 1(a) shows a sectional view of a copying apparatus with a moving optical system. Further, FIG. 1b) shows a side view of the optical system section.

The document 1 placed on the document table is illuminated by an illumination lamp.
First mirror 21. 2nd mirror unit 4.

Lenses LI L2 LS and the third lens of the imaging system provided in parallel
An electrostatic latent image is formed on a photosensitive medium δ, which is an electrophotographic photosensitive member, provided on the circumferential surface of the drum by an optical system using a mirror 24. The latent image formed on the photosensitive medium δ rotating in the direction of the arrow is developed by the developing device 26 and becomes a visible image (toner image).
becomes. This visible image is transferred by the transfer electrode 27 to the recording paper P sent out from the paper feed cassette 30 which stores recording papers of different sizes. The recording paper P carrying the visible f-image is separated from the photosensitive medium 5 by the separating means 28 and conveyed, becomes a permanent image by the fixing device 31, and is discharged from the copying apparatus.

The optical system in the present invention is of a type in which the optical system moves to form a latent image of the original image, and the illumination lamp and the first mirror 21 are integrally moved parallel to the original l at a speed of V. −
Make a move. Also, in synchronization with the movement of the first mirror 21,
A second mirror unit n consisting of two reflecting mirrors arranged at right angles moves in the same direction at a speed of 1/2v. The slit-shaped original image scanned by the cooperation of the first mirror 21 and the second mirror unit 22 is scanned by lenses L, , L, ,
An image is formed on the photosensitive medium 5 by the LS with a magnification of m times, and the lens L! By Ls, the entire document image with a magnification of m times is formed in parallel as a latent image. Figure 1 (bl
are the above three lenses LI, L! ! , Ls are provided in parallel, and FIG. 2 is a plan view of the optical path of the optical system in this embodiment. The image of the original 1 is formed on the photosensitive medium 5 by three lenses L, L2L, and becomes latent images of images B, B, and B3. FIG. 3 shows the positions of images B, B, 113 on recording paper P formed by transfer.

As described above, according to the present apparatus, three images B and 82B can be simultaneously copied onto one sheet of recording paper P, and the recording paper can be disposed of five times so as not to be wasted. Although three lenses are used in this embodiment, the effect can be increased by using a plurality of lenses other than three depending on the reduction magnification.

FIG. 4 falfbl shows a second embodiment of the present invention.

In this example, the original and the photosensitive medium are fixed,
The light source that illuminates the document is turned on to perform a static exposure on the entire surface.
This method forms an electrostatic latent image on a photosensitive medium.

FIG. 4(a) is a sectional view of the copying apparatus according to the present invention, and FIG.
Figure fb) is a side view thereof. The original 1 placed on the original platen on the top of the copying machine is exposed to light by lighting the illumination light source 4, and latent images A and B are formed on the photosensitive medium 6 by the lenses L, L2L, L, and K, respectively. do.

The photosensitive medium 6 is a belt-shaped electrophotographic photosensitive member, which is stretched between two pulleys 5 and rotates and moves in the direction of the arrow.

When copying, the photosensitive medium 6 passes through the charging electrode 8 to be uniformly charged, moves by an amount necessary for copying, and then stops. Planar photosensitive medium 6 at rest
Latent images A and B of the document 1 are formed thereon by the exposure process described above. When the photosensitive medium 6 moves in the direction of the arrow, it is developed by the developing device 9 into a visible image, which is transferred by the transfer electrode 11 onto a sheet of recording paper conveyed from the paper feed cassette 10. The recording paper onto which the visible image has been transferred becomes a permanent image by the fixing device 13 and is discharged from the copying apparatus.

In the optical system of this embodiment, since exposure is performed while the original 1 and the photosensitive medium 6 are stationary, images with different magnifications can be obtained simultaneously using a plurality of lenses LI, LS, LS, L4. Three lenses L4 form an image A, and three images B are formed by lenses L+ L2 Ls K installed in parallel with the traveling direction of the photosensitive medium 6.
obtain at the same time. FIG. 5 shows the size and position of the image formed by this device. The image A formed by the lens L4 and the respective images B and 82B formed by the lenses L+L2 and Ls are arranged on the recording paper without wasting space.

In this example, images A and B with different reduction magnifications were obtained using four lenses L, L2L3L, but by selecting and arranging the focal length and number of lenses, various images can be obtained for the same document. Is it possible to get an image?

In this embodiment, the exposure onto the photosensitive medium 6 was performed by blinking the illumination light source 4, but it is also possible to provide a shutter for each of the lenses L1, L1, I3, and I4, and perform exposure by opening and closing the shutters. In this case, the brightness of lenses L+, Lx, Ls, and I4 need not be the same or similar.

The first and second embodiments have an optical system that can perform exposure simultaneously by using a plurality of lenses.
Lenses L, , L, , I3, , I2.
It is also possible to replace it with a single lens with a shutter equipped with a mechanism for moving it to the optical position of I3. In this case, the three images corresponding to L, l I21 I3 are I3. I2. The images are obtained by the lens L sequentially moving to the position I4, and exposure is performed sequentially.

In addition, although an electrophotographic photosensitive medium is used in the first and second embodiments, a similar optical system can also be used to expose photosensitive materials using silver salt, so that automatic development of photosensitive materials can be performed. Therefore, it is possible to create a copying apparatus that satisfies the scope of the claims of this patent by integrating it with the machine.

Furthermore, not only a reflective original but also a transparent original can be used as the original. To use a transparent original, you can either hold the original in white and illuminate it in the same way as a reflective original, or you can install a mechanism that illuminates the original from the back side, and perform exposure using the same device in other respects. Ru.

〔Effect of the invention〕

According to the present invention, it is possible to reduce the copying time by obtaining several reduced images of the same document in one copying operation, and also to arrange the images on the recording paper without wasting space. Copying apparatuses have also been provided which make it possible to eliminate paper waste and simultaneously obtain images with different magnifications.

[Brief explanation of drawings]

A sectional view of a copying apparatus with a moving optical system as a first embodiment of the present invention is shown in FIG. 1 (al), and a side view of the optical system portion thereof is shown in FIG. 1 f. FIG. 2 is a developed view of the optical system of this embodiment. FIG. 3 shows the image position on the recording paper according to this embodiment. FIG. 4 (Hbl) shows a cross-sectional view and a side view of a copying apparatus according to a second embodiment of the present invention. FIG. 5 shows the arrangement of images on recording paper formed by this apparatus. 1... Original 4...Light source 5...Boo IJ-6125...Photosensitive medium 9.26...Developing device

Claims (1)

[Claims] A copying apparatus that irradiates light onto a document and exposes an image on the document onto a photosensitive medium, comprising means for exposing at least one document as a latent image on the same photosensitive medium multiple times, and converting the latent image into an image. 1. A copying apparatus comprising means for: