Lens position detector

Details Lens position detector Lens position detector

2007-06-21

2010-06-15

Koval, Melissa J (Department: 2862)

Photography

Having variable focal length of camera objective

Power zoom

C359S825000

Reexamination Certificate

active

07738782

ABSTRACT:
A lens position detector for detecting a position of a movable lens group in an optical axis direction includes a manual operating ring, a rotation of the manual operating ring causing the movable lens group to move in the optical axis direction; a code plate installed in a barrel; and a conductive brush fixed to the manual operating ring, the rotation of the manual operating ring causing relative rotational sliding between the conductive brush and the code plate. A surface of the code plate with which the conductive brush is in sliding contact is inclined to a plane orthogonal to the optical axis at an angle of inclination substantially equal to a lead angle of male and female screw threads engaged with each other which are formed on the manual operating ring and the ring member, respectively.

REFERENCES:
patent: 5144493 (1992-09-01), Nomura
patent: 5327184 (1994-07-01), Nomura et al.
patent: 5926322 (1999-07-01), Iwasaki
patent: 2593855 (1999-02-01), None
U.S. Appl. No. 11/766,263 to Kogure et al., filed Jun. 21, 2007.

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