Position detecting device and lens tube

Details Position detecting device and lens tube Position detecting device and lens tube

2006-06-23

2009-08-25

Mahoney, Christopher E (Department: 2862)

Photography

Having variable focal length of camera objective

Power zoom

C348S347000

Reexamination Certificate

active

07580624

ABSTRACT:
A lens tube includes a lens guiding frame, a main unit, and a position detecting device. The lens guiding frame holds a zoom lens. The main unit holds the lens guiding frame to be movable in a direction of an optical axis with the zoom lens. The position detecting device detects a position of the zoom lens held in the main unit. The position detecting device includes an optical sensor and a detection target member. The detection target member includes a sensor cut unit and a sensor cover unit. The sensor cut unit is detected by the optical sensor. The sensor cover unit covers the optical sensor and the sensor cut unit during the detection.

REFERENCES:
patent: 5826114 (1998-10-01), Miyamoto et al.
patent: 6169578 (2001-01-01), Chigira
patent: 6825881 (2004-11-01), Fujii
patent: 2004/0212720 (2004-10-01), Kobayashi
patent: 9-105850 (1997-04-01), None
patent: 2003--287666 (2003-10-01), None
patent: 2003-287666 (2003-10-01), None
JP Publication No. 2003-287666 translation; Azegami, Kazuyoshi; Lens Barrel of Camera; Oct. 10, 2003.

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