1989-04-24
1991-04-09
Perkey, W. B.
354439, G03B 7087
Patent
active
050068806
ABSTRACT:
A programmable shutter of the type wherein a shutter blade is opened and closed by means of a stepping motor. The motor is rotated in a forward direction by drive pulses of a predetermined fixed period to gradually open a sector while at the same time a light measuring circuit is started. Thus, at the time when an appropriate exposure quantity is reached, the direction of rotation of the motor is forcibly reversed to effect closing of the sector to attain simultaneous measurement of light and exposure.
REFERENCES:
patent: 3863263 (1975-01-01), Itagaki
patent: 3903528 (1975-09-01), Kee
patent: 4005448 (1977-01-01), Iwata et al.
patent: 4017872 (1977-04-01), Iwata et al.
patent: 4139289 (1979-02-01), Yamada et al.
patent: 4313656 (1982-02-01), Borowski et al.
patent: 4482238 (1984-11-01), Tokuda
patent: 4648701 (1987-03-01), Ogihara et al.
patent: 4697908 (1987-10-01), Ogihara et al.
Oda Hajime
Ogihara Masuo
Seki Yoichi
Yamazaki Hiroshi
Adams Bruce L.
Perkey W. B.
Seikosha Co. Ltd.
Wilks Van C.
LandOfFree
Programmable shutter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Programmable shutter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable shutter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2038016