Method and machine for automatic focusing in a projection system

Details Method and machine for automatic focusing in a projection system Method and machine for automatic focusing in a projection system

1982-12-30

1984-12-18

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Focus or magnification control

G03B 2734, G03B 2740

Patent

active

044888040

ABSTRACT:
A method and machine for automatic focusing in a projection system with continuously variable magnification, wherein an original picture is projected onto a photosensitive material by a focusing lens, wherein one of these three members is fixed and the other two members are moved in a direction of a light axis by moving means, wherein the positions of the two moving members are detected by detectors, and wherein control means controls that, when the magnification of a picture image is changed, one moving member having a larger moving rate than that of the other moving member is moved ahead of the other moving member and the other moving member is moved dependent on the one moving member so that the picture image projected may constantly be focused onto the photosensitive material.

REFERENCES:
patent: 2655834 (1953-10-01), Pennington
patent: 3832058 (1974-08-01), Gusovius
patent: 4021115 (1977-05-01), Jeppesen
patent: 4253763 (1981-03-01), Schleifenbaum

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