Variable magnification copying machine

Details Variable magnification copying machine Variable magnification copying machine

1986-11-21

1989-02-07

Grimley, A. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 8, G03B 2752, G03G 1528

Patent

active

048035254

ABSTRACT:
A variable magnification copying machine for guiding light reflected from an original onto a photosensitive body through means of a plurality of mirrors and a lens system and for forming a latent image of the original upon the photosensitive body includes a variable magnification optical apparatus. The variable magnification optical apparatus selects one of at least two variable magnification modes based upon U variable and U fixed systems in each one of at least two regions obtained by dividing a variable magnification range and varies the magnification by a combination of the variable magnification modes. The variable magnification mode based upon the U variable system changes the optical path length from a surface of the original to the photosensitive body so as to vary the magnification while maintaining the focal length of the lens system constant. The variable magnification mode based upon the U fixed system changes the focal length of the lens system so as to vary the magnification while maintaining the optical path length constant.

REFERENCES:
patent: 4116561 (1978-09-01), Knechtel et al.
patent: 4474461 (1984-10-01), Tokuhara
patent: 4571063 (1986-02-01), Horiuchi et al.

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