1988-04-20
1989-07-25
Gellner, Michael L.
354265, 354457, G03B 914
Patent
active
048518700
ABSTRACT:
The disclosure relates a piezoelectric element-drive type shutter apparatus for camera. The shutter apparatus includes a main piezoelectric element having a free end which is able to move between a closed position and an opening position to drive shutter blades so as to be opened and closed, and an auxiliary piezoelectric element having a free end for urging the shutter blades toward its closed position when the free end of the main piezoelectric element returns from the opening position to the closed position. When the main piezoelectric element returns to the closed position, i.e. an initial position, the auxiliary piezoelectric element assists the returning movement of the main piezoelectric element. Accordingly, the shutter blades can be closed at a very high speed. This is very effective particularly when a small aperture of the shutter blade is desired. Furthermore, since the returning movement of the main piezoelectric element includes a compulsory force of the auxiliary element as well as a returning force of itself, the returning movement of the main piezoelectric element is insured to be stable as well as speedy, so that very accurate exposure can be obtained.
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Hashimoto Takeshi
Iwata Michihiro
Ootsuka Hiroshi
Tanaka Yoshihiro
Tsuji Sadafusa
Gellner Michael L.
Minolta Camera Kabushiki Kaisha
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