Method and apparatus for controlling exposure

Details Method and apparatus for controlling exposure Method and apparatus for controlling exposure

1996-02-28

1999-03-23

Metjahic, Safet

Photocopying

Projection printing and copying cameras

Multicolor picture

355 67, G03B 2772

Patent

active

058867732

ABSTRACT:
A method and an apparatus for controlling exposure are disclosed. A light beam carrying gradation image information is projected to writing side of spatial light modulating means and another light beam is projected to reading side of the modulating means to obtain a light beam for exposure in accordance with the intensity of the light beam to the writing side. By varying the reflectance on the reading side in accordance with the gradation image information, the light beam for exposure is obtained and the amount of exposure is controlled. The reflectance on the reading side is controlled by continuously varying the intensity of the light to the writing side and/or by continuously varying the driving voltage of the modulating means.

REFERENCES:
patent: 3906290 (1975-09-01), Kurahashi et al.
patent: 5159456 (1992-10-01), Takanashi et al.
patent: 5325107 (1994-06-01), Ogawa et al.
patent: 5327263 (1994-07-01), Katagiri et al.
patent: 5416561 (1995-05-01), Sawano et al.
patent: 5528392 (1996-06-01), Nakagawa et al.
patent: 5541618 (1996-07-01), Shinoda
patent: 5614990 (1997-03-01), Bruce et al.

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