Title:
POSITION DETECTOR IN LENS MOVING MECHANISM
Document Type and Number:
Japanese Patent JPH05264879
Kind Code:
A
Abstract:
PURPOSE:To improve the positional accuracy of a detecting member at the time of assembling and to reduce the manufacturing cost. CONSTITUTION:A pattern ring 13 provided with a shielding plate 13b having an L width in a P cycle is fixed on one end of a focus ring 12, and a photointerrupter 19 integrally formed by one light emitting element 17 and two light receiving elements 18a and 18b is disposed in a rotational area. As for the photointerrupter 19 and the pattern ring 13, the following conditions are satisfied; 0.5<(b/d).(2d-4delta)/P<2 and 0.5<(b/d).(d-t/2-2delta)/L<2. Provided that (d) denotes a distance between the light emitting element and two light receiving elements, (b) denotes a distance between two light receiving elements, (t) denotes the plate thickness of the shielding plate 16b and (delta) denotes the positional deviation from the center line F of the distance (d) of the center of the plate thickness of the shielding plate 16b.
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Inventors:
Haruki Oe
Application Number:
JP6561192A
Publication Date:
October 15, 1993
Filing Date:
March 24, 1992
Export Citation:
Assignee:
Copal Co., Ltd.
International Classes:
G02B7/08; G03B3/10; G03B13/34; H03M7/22; H04N5/232; (IPC1-7): G02B7/08; G03B3/10; G03B13/34; H03M7/22; H04N5/232
Attorney, Agent or Firm:
Taiji Shinohara (1 person outside)