Photography – Exposure control circuit – Shutter speed function only
Patent
1995-12-26
1997-08-19
Metjahic, Safet
Photography
Exposure control circuit
Shutter speed function only
396456, 396484, 310323, 310328, G03B 908, H01L 4108
Patent
active
056598211
ABSTRACT:
The present invention relates to a driving apparatus arranged to perform driving control of a travelling member, such as a shutter member, by using a vibration wave motor. According to the present invention, the travelling member is arranged to be driven by the spring force of a spring member. The travelling member is held in a stopped state against the spring force by the stopping torque of the vibration wave motor, and by causing the vibration wave motor to generate a standing wave, the stopping torque is cancelled so that the travelling member starts travelling by the spring force.
REFERENCES:
patent: 4491401 (1985-01-01), Inaba et al.
patent: 4560263 (1985-12-01), Katsuma et al.
patent: 4671637 (1987-06-01), Toyoda
patent: 4935659 (1990-06-01), Naka et al.
patent: 4989030 (1991-01-01), Naka et al.
Kawakita Katsuya
Nakagawa Kazuyuki
Canon Kabushiki Kaisha
Han J. K.
Metjahic Safet
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