Claims
- 1. An electrostatic photographic copying apparatus comprising:
- a frame member having a reciprocating transparent plate on which to place an original to be copied;
- a rotatable photosensitive drum having an electrostatic photographic material on the periphery thereof;
- a stationary optical system for projecting an image of the original placed on said transparent plate onto the surface of the photographic material as the transparent plate and photosensitive drum move relative to the optical system;
- an image-forming zone disposed exteriorly of, and alongside, the periphery of said sensitive drum for forming on said sensitive material an electrostatic latent image corresponding to the image of the original or a developed image corresponding to the latent image;
- a transfer zone for transferring said elctrostatic latent image or developed image to a transfer paper; and
- a transfer paper forwarding system for feeding the transfer paper to said transfer zone and for forwarding the transfer paper on which said electrostatic latent image or developed image has been transferred to a discharge end through a desired treating zone from said transfer zone;
- wherein the improvement resides in the optical system which includes;
- an optical opening for exposure to the original;
- an optical opening for exposure of the surface of the sensitive material;
- first and second reflex mirrors;
- one mirror lens;
- an optical chamber which is substantially optically closed except for said optical openings, and
- a light source for illuminating the original to be copied;
- said two optical openings, first and second reflex mirrors and mirror lens being disposed so that the light reflected from the original to be copied follows a first path to said first reflex mirror through said optical opening for exposure of the original, is reflected by said first reflex mirror and follows a second path to said mirror lens, is reflected by the mirror lens and follows a third path back again to the first reflex mirror, is again reflected by the first reflex mirror and follows a fourth path across the second path to the second reflex mirror, is reflected by the second reflex mirror along a final path crossing said first path wherein the final path passes through the optical opening for exposure of the photosensitive material, thereby forming on the surface of the photosensitive material a four-fold reverse image of the desired size corresponding to the original to be copied.
- 2. The apparatus of claim 1, wherein means are provided to reciprocate said transparent plate at the upper part of the apparatus; wherein said optical opening for exposure of the original is located at the top of said optical chamber and at a position facing at least a part of a path of movement of said transparent plate wherein said optical opening for exposure of the surface of the photosensitive material is located at the side part of said optical chamber and at a position facing at least a part of the circumferential surface of said photosensitive drum; wherein said first reflex mirror is located at the bottom of said optical chamber, and wherein said second reflex mirror and said mirror lens are disposed at the said portion of said optical chamber which is opposite to the portion at which said optical opening for exposure of the surface of the photosensitive material is disposed.
- 3. The apparatus of claim 1 wherein the optical distance between the original and the mirror lens is equal to the optical distance between the mirror lens and the surface of the photosensitive material.
- 4. The electrostatic photographic copying apparatus of claim 1, wherein said image-forming zone includes a developing device for developing the electrostatic latent image formed on the photosensitive material by using a toner powder;
- said optical system includes: an optical chamber provided with an optical element for forming an image on the surface of the photosensitive material which corresponds to the original, said optical chamber forming a chamber substantially separated from said developing device to prevent the intrusion of the toner powder from the developing device.
- 5. The apparatus of claim 4 wherein said optical chamber is substantially optically closed by partitioning means except for the two optical openings, and wherein said optical opening for exposure of the surface of the sensitive material includes a transparent plate.
- 6. The apparatus of claim 5 wherein said transparent plate is connected to said partitioning wall means through a sealing member.
Priority Claims (1)
Number |
Date |
Country |
Kind |
47-95460 |
Sep 1972 |
JA |
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Parent Case Info
This is a division of application Ser. No. 399,516, filed Sept. 21, 1973, now U.S. Pat. No. 3,923,391.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
450,919 |
May 1968 |
CH |
Divisions (1)
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Number |
Date |
Country |
Parent |
399516 |
Sep 1973 |
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