Electrostatic copying apparatus

Details Electrostatic copying apparatus Electrostatic copying apparatus

1983-04-14

1985-08-06

Shoop, Jr., William M.

Photocopying

Including fiber optics

355 55, 355 56, 355 58, 355 66, G03G 1528

Patent

active

045332339

ABSTRACT:
A variable magnification electrostatic copying apparatus comprising a transparent plate on which to place a document to be copied, an optical system for projecting the image of the document onto an electrostatographic photosensitive member at any desired projecting ratio selected from a plurality of projecting ratios in an exposure zone located along the moving path of the photosensitive member, and a driving means for moving at least a part of the optical system and the transparent plate relative to each other. The optical system includes at least one position-variable optical element assembly adapted to be held at any of a plurality of positions corresponding to the aforesaid plurality of projecting ratios. The variable magnification electrostatic copying apparatus includes a unique improved means for varying the projecting ratio of the optical system by moving the position-variable optical element assembly.

REFERENCES:
patent: 3819998 (1974-06-01), Yole
patent: 3884574 (1975-05-01), Doi et al.
patent: 4118118 (1978-10-01), Barto, Jr.
patent: 4125323 (1978-11-01), Ikeda et al.
patent: 4126389 (1978-11-01), Ikeda et al.
patent: 4168905 (1979-09-01), Kitajima
patent: 4209248 (1980-06-01), Gibson et al.
patent: 4246525 (1981-01-01), Coppola
patent: 4367945 (1983-01-01), Abe
patent: 4372676 (1983-02-01), Miyata et al.
patent: 4436416 (1984-03-01), Negoro et al.

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