1985-05-06
1987-09-29
Adams, Russell E.
354452, G03B 708
Patent
active
046965602
ABSTRACT:
In a program shutter having a sector which is opened and closed by a step motor, there is provided a home position detection means for detecting whether or not the sector is positioned in a home position. Before and after an exposure operation, it is detected whether or not the sector is positioned in the home position, and if the sector is not positioned in the home position, the step motor is reversely rotated to complete the closing movement of the sector.
REFERENCES:
patent: 4009866 (1977-03-01), Iwata et al.
patent: 4053907 (1977-10-01), Iwata et al.
patent: 4354748 (1982-10-01), Grimes et al.
patent: 4396271 (1983-08-01), Hiraike
patent: 4396272 (1983-08-01), Shono et al.
Oda Hajime
Ogihara Masuo
Seki Yoichi
Yamazaki Hiroshi
Adams Bruce L.
Adams Russell E.
Seikosha Co. Ltd.
Wilks Van C.
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