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Title:
FILTER DISK DEVICE
Document Type and Number:
Japanese Patent JPS6423237
Kind Code:
A
Abstract:

PURPOSE: To precisely identify a filter which positions on an optical axis and filters adjacent to it and to easily mount a passive reflector by respectively dividing the passive reflectors provided between plural filters into plural areas and arraying reflection parts in different positions.

CONSTITUTION: Four filters 11 and four passive reflectors having eight-divided areas are mounted on a disk 10 and sensors 13a and 13b are mounted by dislocating them by one area in a circumferential direction by setting the oblique line parts as reflection parts. When the filter 11a is on the optical axis and the disk is turned clockwise by one area, the sensor 13 detects a high and low level signal from the passive reflector 12a and identifies the filter 12b which is adjacent on the left side. And by rotating counterclockwise by one area, the sensor 13 detects a low and high level signal and identifies the filter 11b which is adjacent on the right side. Then, the reflecting member for identifying the filter can be easily mounted and the filter which positions on the optical axis and the filters adjacent to it can be precisely detected.


Inventors:
Tamura, Keiichi
Ito, Tetsuo
Sato, Takayuki
Application Number:
JP1987000179469
Publication Date:
January 25, 1989
Filing Date:
July 17, 1987
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G03B11/00; H04N5/238; (IPC1-7): G03B11/00; H04N5/238
Domestic Patent References:
JPS6076726A1985-05-01
JP54184017B