| US 7,399,956 B2 | ||
| Optical encoder with sinusoidal photodetector output signal | ||
| Weng Fei Wong, Penang (Malaysia); Chee Foo Lum, Penang (Malaysia); Siang Leong Foo, Penang (Malaysia); Song Wah Ooi, Penang (Malaysia); Keen Hun Leong, Penang (Malaysia); Yik Foong Soo, Penang (Malaysia); Sai Hong Hung, Penang (Malaysia); and Gin Ghee Tan, Penang (Malaysia) | ||
| Assigned to Avago Technologies ECBUIP Pte Ltd, Singapore (Singapore) | ||
| Filed on Nov. 28, 2005, as Appl. No. 11/287,947. | ||
| Prior Publication US 2007/0120049 A1, May 31, 2007 | ||
| Int. Cl. G01D 5/34 (2006.01) | ||
| U.S. Cl. 250—231.14 [250/231.16; 250/231.17] | 19 Claims |
| 1. An optical encoder, comprising:
an optical encoder pattern comprising an alternating pattern of light elements and dark elements; and
an optical unit, comprising,
an optical emitter providing light to the encoder pattern, and
an optical sensor including a photo-detector receiving the light from the optical encoder pattern and in response thereto
outputting a sinusoidal signal indicating relative movement between the optical sensor and the encoder pattern,
wherein the photo-detector has one of a diamond shape, a modified diamond shape, and an hourglass shape.
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