1986-04-29
1987-04-28
Punter, William H.
G02B 704
Patent
active
046609334
ABSTRACT:
Travelling oscillation waves are generated in a lens assembly at an oscillation element by impressing a voltage to an electro-restriction element or elements, whereupon a lens driving operation is performed by frictionally driving a moving element which is pressed in contact with the oscillation element. In the case of manual operation, an oscillation ring operating as the oscillation element is separated from a rotation ring which constitutes the moving element by a clutch device and then the rotation ring is manually rotated for effecting the lens driving operation.
REFERENCES:
patent: 4019073 (1977-04-01), Vishnevsky
patent: 4231646 (1980-11-01), Iida
patent: 4423941 (1984-01-01), Iwata et al.
patent: 4456356 (1984-06-01), Okabe
patent: 4484099 (1984-11-01), Kawai et al.
patent: 4495432 (1985-01-01), Katsuma et al.
Hiramatsu Akira
Inaba Hiroyoshi
Katsuma Makoto
Murakami Hiroyasu
Notagashira Hidefumi
Canon Kabushiki Kaisha
Punter William H.
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