Variable magnification image projector

Details Variable magnification image projector Variable magnification image projector

1985-09-18

1986-12-09

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 66, G03B 2734, G03B 2740, G03B 2770

Patent

active

046277200

ABSTRACT:
An image projector is adapted to change the magnification of a projected image by moving a zoom lens with its focal length being changed, wherein the zoom lens is moved to and then stopped at a goal position from the initial position in the first direction. When it is desired to move the zoom lens to another goal position in the second direction opposite to the first direction as viewed from the initial position, the zoom lens is once moved to its reversal position beyond the second goal position and thereafter moved from the reversal position to the second goal position.

REFERENCES:
patent: 3832058 (1974-08-01), Gusovius
patent: 3873189 (1975-03-01), Whitaker et al.
patent: 3972056 (1976-07-01), Tsusimoto et al.
patent: 4080062 (1978-03-01), Torigai et al.
patent: 4149792 (1979-04-01), Fraser
patent: 4215922 (1980-08-01), Szabo et al.
patent: 4348089 (1982-09-01), Shenk
patent: 4420248 (1983-12-01), Ogawa et al.

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