Image projection device for use in slit exposure optical system

Details Image projection device for use in slit exposure optical system Image projection device for use in slit exposure optical system

1988-08-03

1989-12-26

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355233, G03B 2734, G03B 2740, G03B 2770

Patent

active

048901377

ABSTRACT:
An image projection device for use in a slit exposure type optical system, which has a projection lens cut horizontally at a position above the optical axis thereof and a holder which holds the projection lens at its lower circumferential portion. The slit exposure type optical system includes a transparent plate for supporting an original thereon, an illumination lamp for illuminating the original on the transparent plate from below, a first, second, third and fourth mirrors for transmitting a bundle of rays reflected from the original to a light receiving surface, and a slitted member for restricting the bundle of rays from the original to the light receiving surface. The projective lens can have a made compacter than when the circular lens is used and can be smaller eccentricity than when the lens is cut at its upper and lower portions.

REFERENCES:
patent: 4459016 (1984-07-01), Tokuhara ewt al.

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