Photographic printing shutter

Details Photographic printing shutter Photographic printing shutter

1994-09-30

1996-07-02

Adams, Russell E.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 35, 3542341, 354254, 354265, G03B 708

Patent

active

055327877

ABSTRACT:
A photographic printing shutter includes a pair of semicircular shutter bodies for cutting off printing light or allowing it to pass, at least one pair of rotatable shafts disposed substantially parallel to the axis of the printing light with the axis thereof interposed therebetween and respectively fixed to the pair of semicircular shutter bodies, and drive motors for respectively rotating the pair of semicircular shutter bodies between a closing position where the pair of semicircular shutter bodies cuts off the printing light and an opening position where the pair of semicircular shutter bodies allows the printing light to pass. The pair of semicircular shutters is rotated every 180.degree. so that a uniform exposure time can be obtained at any portion in a light transmissive window.

REFERENCES:
patent: 3945027 (1976-03-01), Kimura et al.
patent: 4469996 (1984-09-01), Oltendorf
patent: 4474464 (1984-10-01), Kanai et al.
patent: 4631458 (1986-12-01), Furuichi
patent: 4905043 (1990-02-01), Satou et al.
patent: 5083154 (1992-01-01), Terashita et al.
patent: 5202721 (1993-04-01), Kobayashi et al.

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