Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-01-12
1996-11-05
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, G01D 534
Patent
active
055720196
ABSTRACT:
An encoder has a detector that detects displacement of a movable portion and a generator that generates multiple phase periodic signals with at least three different phases. The phase periodic signals change according to the displacement and a selector selects one of the multiple phase periodic signals to which a predetermined offset is added. In one encoder arrangement, a light beam is radiated toward a scale on which a grating is formed along a relative displacement direction. A light-receiving element receives light modulated by the grating to obtain relative displacement information between the light beam and the scale. The light receiving element has an opening width that changes in a direction perpendicular to the displacement direction.
REFERENCES:
patent: 4037325 (1977-07-01), Weber et al.
patent: 4375592 (1983-03-01), Cox et al.
patent: 4704523 (1987-11-01), Uchida
patent: 4806034 (1989-02-01), Plummer
patent: 5021650 (1991-06-01), Rieder et al.
patent: 5059791 (1991-10-01), Ishizuka et al.
patent: 5113693 (1992-05-01), Hata
patent: 5120954 (1992-06-01), Taniguchi
patent: 5332895 (1994-07-01), Reider et al.
patent: 5347355 (1994-09-01), Eguchi
Allen Stephone B.
Canon Kabushiki Kaisha
LandOfFree
Encoder with varying width light receiver and apparatus having t does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Encoder with varying width light receiver and apparatus having t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Encoder with varying width light receiver and apparatus having t will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2016441