Magnification changing device for copying machine

Details Magnification changing device for copying machine Magnification changing device for copying machine

1984-06-21

1985-12-31

Hix, L. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 60, 355 66, G03B 2734, G03B 2740

Patent

active

045617708

ABSTRACT:
A magnification changing device for use in a copying machine, capable of effecting a scale-up and-down magnification of a manuscript. The device has a first reflecting mirror system adapted to be moved at a constant speed and arranged to receive the optical image from an object, and a second reflecting mirror system adapted to receive the light reflected by the first reflecting mirror system and to move in the same direction as the first reflecting mirror system at a speed which is a half that of the movement of the first reflecting mirror system. The device also has a fixed magnifier lens upon which the light reflected by the second reflecting mirror system impinges, a movable third reflecting mirror system adapted to receive the light coming through the lens, and a magnification changing mechanism for moving the reflecting mirror systems in synchronism with each other such that a relationship corresponding to varying magnification degree is maintained between the distance between the first and second reflecting mirror systems and the distance between the lens and the third reflecting mirror system. According to this arrangement, any desired magnification degree is set by the magnification changing mechanism while focussing the light from the third reflecting mirror system.

REFERENCES:
patent: 3901586 (1975-08-01), Suzuki et al.
patent: 4047811 (1977-09-01), Allis et al.
patent: 4453824 (1984-06-01), Miyake et al.

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