Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1993-05-13
1995-02-14
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Illumination systems or details
G03B 2772
Patent
active
053900006
ABSTRACT:
An improved exposure apparatus is capable of providing 100% of a light shielding affect when closing a PLZT optical shutter even if a light source remains turned on and thus produces a high-speed, high-quality exposures. For that purpose, the exposure apparatus includes a light source; a PLZT optical shutter of linear form extending at a right angle to a the pass line of a photosensitive material for exposing the photosensitive material during its running; a light modulation filter unit having a plurality of optical modulation filters arranged in a row along a light path of the light source; a light modulation filter driving mechanism for actuating the optical modulation filters separately to advance them to and retract them from a light path between the PLZT optical shutter and the light source, and a filter driving mechanism controller for controlling the movement of the light modulation filter driving mechanism so that a desired tone of light can be obtained at a predetermined timing.
REFERENCES:
patent: 3926520 (1975-12-01), Kaufman
patent: 4025189 (1977-05-01), Pugsley
patent: 4229095 (1980-10-01), Mir
patent: 4639127 (1987-01-01), Beery et al.
patent: 4937592 (1990-06-01), Akao et al.
patent: 5122831 (1992-06-01), Suzuki
Braun Fred L.
Noritsu Koki Co., Ltd.
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