Photography – Flash system responsive to focal length or distance – Illumination angle responds to focal length or distance
Patent
1997-02-19
1998-04-14
Perkey, W. B.
Photography
Flash system responsive to focal length or distance
Illumination angle responds to focal length or distance
396 84, 396349, G03B 500, G03B 1304, G03B 1503, G03B 1704
Patent
active
057404747
ABSTRACT:
An apparatus for eliminating a backlash in a zoom finder of a zoom lens camera. A cam member is provided with a cam surface that is engaged with movable variable power lens of the finder. The cam member is driven in association with the zoom-photographing lens, and the cam surface is provided with a zoom section as well as a transfer section in which no movement of the movable variable power lens occurs. A backlash eliminating cam surface is provided separately from the cam surface on the cam member for the movable variable power lens. An oblique cam surface is provided on the backlash eliminating cam surface and is inclined with respect to a plane perpendicular to the optical axis of the movable variable power lens. The oblique cam surface is formed in a section corresponding to the zoom section side of the transfer section of the cam surface. A backlash eliminating member is biased and pressed against the oblique cam surface to exert a drive force on the cam member.
REFERENCES:
patent: 4936664 (1990-06-01), Haraguchi et al.
patent: 4944030 (1990-07-01), Haraguchi et al.
patent: 5335030 (1994-08-01), Suzuka
Asahi Kogaku Kogyo Kabushiki Kaisha
Perkey W. B.
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