Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-12-25
2007-12-25
Epps, Georgia (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S231180
Reexamination Certificate
active
10610663
ABSTRACT:
A displacement sensor which detects a positional displacement of a movable member, comprises a position signal generating section configured to generate a periodical signal in accordance with movement of the movable member, a generating section of a signal for detecting a reference position, configured to generate the signal for detecting the reference position, when the movable member is in a predetermined position, a reference position detection circuit configured to detect that the movable member is in a reference position based on the signal for detecting the reference position, generated by the generating section of the signal for detecting the reference position, in synchronization with the periodical signal generated by the position signal generating section, and a selecting section configured to be capable of selecting a phase position to be synchronized from a plurality of phase positions on the periodical signal in the synchronization in the reference position detection circuit.
REFERENCES:
patent: 6229140 (2001-05-01), Ishizuka
patent: 7-4991 (1995-01-01), None
patent: 7-203661 (1995-08-01), None
patent: 8-261795 (1996-10-01), None
Epps Georgia
Ko Tony
Olympus Corporation
Scully , Scott, Murphy & Presser, P.C.
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