Variable magnification image forming apparatus

Details Variable magnification image forming apparatus Variable magnification image forming apparatus

1990-05-21

1992-03-24

Moses, R. L.

Photocopying

Contact printing

Light boxes

355243, 355 55, G03G 2100

Patent

active

050992821

ABSTRACT:
An image-forming apparatus capable of changing the size of the image formed on an electronic photosensitive medium is disclosed. The image-forming apparatus is provided with an auxiliary projection optical system in addition to a main projection optical system which is able to project an image on the photosensitive medium with variable magnification. The auxiliary projection optical system is provided to illuminate exclusively the non-image forming area of the photosensitive medium. The size of the image of the light source of the auxiliary projection optical system formed on the photosensitive medium is controllable as desired.

REFERENCES:
patent: 3671121 (1972-06-01), Albert
patent: 3967896 (1976-07-01), Looney et al.
patent: 4034221 (1977-07-01), Yamashita
patent: 4318597 (1982-03-01), Kotani et al.
patent: 4344691 (1982-08-01), Grant et al.
Earle B. Brown, "Modern Optics", Reinhold Publishing Corporation, 1965, pp. 141-142.

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