Title:
DEVICE FOR DETECTING POSITION OF LENS FOR CAMERA
Document Type and Number:
Japanese Patent JP3162757
Kind Code:
B
Abstract:
PURPOSE: To miniaturize a camera and to simplify constitution in the case of detecting the positions of plural lenses by securing no space for detecting the lens position.
CONSTITUTION: This device is provided with a differential coil guide 13a for guiding a lens, which is obtained by winding a differential coil consisting of a primary coil and a secondary coil which mutually face in an opposite direction in a lens moving direction, and a supporting sleeve 14, which is made of metal and arranged on the outer periphery of the guide 13a so as to freely slide, and the plural differential coils are provided on the guide 13a. Then, plural supporting sleeves 14a and 14b are provided corresponding to the differential coil. A voltage value induced to the secondary coil from the primary coil when the sleeves 14a and 14b are moved is fetched to detect the position of the lens, so that the positions of the plural lenses are detected. Therefore, the space is saved and the constitution is simplified by using the conventional guiding guide.
Inventors:
Kaneko, Koji
Application Number:
JP1991000282278
Publication Date:
February 23, 2001
Filing Date:
October 01, 1991
Export Citation:
Assignee:
FUJI PHOTO OPTICAL CO LTD
International Classes:
G01B7/00; G02B7/04; G02B7/08; G05D3/12; G01B7/00; G02B7/04; G02B7/08; G05D3/12; (IPC1-7): G02B7/08
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