Variable magnification optical mechanism

Details Variable magnification optical mechanism Variable magnification optical mechanism

1976-11-24

1978-03-21

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Image transferred to or from curved surface

355 57, G03B 2748, G03B 2770

Patent

active

040800628

ABSTRACT:
The disclosure describes a variable magnification optical mechanism in an image forming apparatus in which a varied image at a selected magnification of an original image is formed. A photosensitive body on which the varied image is exposed is moved at a definite speed (v) irrespective of the selected magnification (m) and optical means for transmitting the image of the original to the photosensitive body is driven at a speed ratio of v/m. The pre-running length (l) of the optical means is changed in accordance with the selected magnification (m) at a ratio of l/m so that coincidence of the original image and the variation image formed therefrom may be attained every time.

REFERENCES:
patent: 3598489 (1971-08-01), Thomas et al.
patent: 3614222 (1971-10-01), Post et al.
patent: 3873189 (1975-03-01), Whitaker et al.
patent: 3884574 (1975-05-01), Dol et al.
patent: 3914044 (1975-10-01), Ogawa
patent: 3947188 (1976-03-01), Simpson
patent: 3950090 (1976-04-01), Washio et al.

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