Image forming method and apparatus with detection of focus state

Details Image forming method and apparatus with detection of focus state Image forming method and apparatus with detection of focus state

1995-09-26

1998-05-19

Braun, Fred L.

Photocopying

Projection printing and copying cameras

With focusing or projection screen

355 55, G03B 1328

Patent

active

057542775

ABSTRACT:
In an image forming apparatus, an image illuminated by an illumination device is projected on a screen or on a recording medium. The focus state of the projected image is detected by a focus detection unit. At least a part of the focus detection unit is moved to detect the focus state over plural areas in the projected image.

REFERENCES:
patent: 4695155 (1987-09-01), Ishii et al.
patent: 4988187 (1991-01-01), Kuriyama
patent: 5114223 (1992-05-01), Torigoe et al.

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