System for detecting a position of a movable object without cont

Details System for detecting a position of a movable object without cont System for detecting a position of a movable object without cont

1995-07-31

1997-12-16

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

25055932, 2502061, 348262, H01J 4014

Patent

active

056988613

ABSTRACT:
A position detecting system for detecting a position of a movable object having a light emitter without contact, the system includes: a first light sensor which has a first view area and receives light from the light emitter of the movable object in the first view area to produce image data, and a second light sensor which has a second view area and receives light from the light emitter of the movable object in the second view area to produce image data, a combination of the first and second view areas covering a space in which the movable object moves, and the first and second view areas overlapping each other; and a processor which calculates a position of the movable object based on image data produced by the first and second light sensors.

REFERENCES:
patent: 4847485 (1989-07-01), Koelsch
patent: 4965453 (1990-10-01), Hoschette et al.
patent: 5196689 (1993-03-01), Sugita et al.
patent: 5245177 (1993-09-01), Schiller
patent: 5317394 (1994-05-01), Hale et al.
Taiwanese Publication: Applicable practice of sensor with figures, published in Feb. 1987.
Patent Abstracts of Japan, vol. 13, No. 353 (P-913), 8 Aug. 1989 & JP-A-01 112490 (Kenro Motada) 1 May 1989.

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