Position detecting device for detecting the absolute value...

Details Position detecting device for detecting the absolute value... Position detecting device for detecting the absolute value...

2008-02-05

2009-10-13

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231130

Reexamination Certificate

active

07601945

ABSTRACT:
A position detecting devices includes a scale, a sensor, and a control section. The scale has a plurality of light emitting elements located at spacings along a direction in which a movable member is moved. Mounted on the member, the sensor detects light from at least one of the elements within a predetermined detection range longer than a largest one of the spacings, and outputs a light reception signal according to a position where the light is received within the range. Upon receipt of the signal, the control section retrieves from the storage section information on a located position of one of the light emitting elements that is being driven, and calculates a position of the member based on the retrieved information and the received signal.

REFERENCES:
patent: 4786803 (1988-11-01), Majette et al.
patent: 2004-191267 (2004-07-01), None

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