Photography – With exposure objective focusing means – focusing aid – or... – Lens drive circuit or motor structure
Patent
1998-09-01
1999-11-09
Perkey, W. B.
Photography
With exposure objective focusing means, focusing aid, or...
Lens drive circuit or motor structure
396137, 359824, G03B 310, G02B 709
Patent
active
059830344
ABSTRACT:
A lens barrel including a surface wave motor to generate surface waves to drive a photographic optical system. The surface wave motor includes a fixed member to generate surface waves to drive the moving member which drives the photographic optical system. An externally operated manual operation unit drives the photographic optical system upon manual operation thereof. A roller is mounted in a freely rotatable state on the fixed member, and is in compressive contact with the manual operation unit via an intermediate ring. When a mode selection switch is set to a manual focus adjustment mode, the fixed member comes into compressive contact with a rotary element, and is rotatable integrally with a cam ring. By rotating a rotation ratio setting ring in a circumferential direction, a large diameter portion of the roller comes into contact with a changeover ring, and a small diameter portion of the roller to comes into contact with a changeover ring. Accordingly, the ratio of the rotation angles of the fixed member and the hand-operated ring can be changed in two steps. As a result, when the hand-operated ring is rotated during photography, the focus adjustment optical system for focus adjustment can be driven quickly or slowly for easy operability of manual focus adjustment.
REFERENCES:
patent: 5708872 (1998-01-01), Fukino
Nikon Corporation
Perkey W. B.
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