Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-09-04
2007-09-04
Epps, Georgia (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S231180
Reexamination Certificate
active
10725696
ABSTRACT:
An encoder for measuring the position of a rotating shaft is disclosed. The encoder includes a drum having an encoding track thereon and a detector module having a light source and a photodetector. The drum includes a cylindrical surface characterized by an axis, the drum having a surface with a normal perpendicular to the axis. The encoding track includes a plurality of alternating reflective and non-reflective stripes arranged on the cylindrical surface. The first light source illuminates the stripes at an opaque angle relative to the normal. The first photodetector is positioned to receive light from the light source that is reflected from the reflective stripes when the drum moves relative to the photodetector. In one embodiment, the drum rotates about the axis when the shaft rotates. The encoding track can be either on the inside or outside of the drum.
REFERENCES:
patent: 4124839 (1978-11-01), Cohen
patent: 4987299 (1991-01-01), Kobayashi et al.
patent: 5438882 (1995-08-01), Karim-Panahi et al.
patent: 5471054 (1995-11-01), Watanabe
patent: 5734108 (1998-03-01), Walker et al.
patent: 6448996 (2002-09-01), Suganuma
patent: 6459389 (2002-10-01), Germuth-Loffler et al.
patent: 6587211 (2003-07-01), Gelbart
patent: 6639206 (2003-10-01), Rothamel et al.
patent: 6817528 (2004-11-01), Chen
patent: 2002/0195551 (2002-12-01), Baxter et al.
patent: 39 27 846 (1990-03-01), None
patent: 197 05 312 (1998-08-01), None
patent: 197 58 104 (1999-07-01), None
patent: 0 146 303 (1991-09-01), None
German Office Action dated Jun. 22, 2006 involving counterpart German application No. 10 2004 048237.3-52.
English Translation of German Office Action dated Jun. 22, 2006 involving counterpart German application No. 10 2004 048237.3-52.
Chin Yee Loong
Chua Lai Hing
Fo Kok Hing
Hataguchi Toshiya
Lakshmanan Srinivasan
Avago Technologies ECBU (IP) Singapore Pte. Ltd.
Epps Georgia
Wyatt Kevin
LandOfFree
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