Image forming device of copying apparatus of the variable duplic

Details Image forming device of copying apparatus of the variable duplic Image forming device of copying apparatus of the variable duplic

1978-01-23

1979-10-23

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

G03B 2557

Patent

active

041719042

ABSTRACT:
In copying apparatus capable of producing a duplicate from an original by varying the size of the former from that of the latter, a change tends to occur in the exposure of an image forming surface when the rate of magnification or reduction is varied, with a result that the image forming surface is either overexposed or underexposed. To obviate this defect, a mirror is mounted in the vicinity of the original in such a manner that the distance between the mirror and the original and the length of a short side of the effective reflecting surface of the mirror corresponding to the width of a slit for exposing the image forming surface to the original are kept constant. By this arrangement, it is possible to keep constant at all times the exposure of the image forming surface, irrespective of a change in the rate of magnification or reduction.

REFERENCES:
patent: 3476478 (1969-11-01), Rees
patent: 3917393 (1975-11-01), Nier
patent: 3996596 (1976-12-01), Kurtik
patent: 4084897 (1978-04-01), Queener

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