Optical encoder

Details Optical encoder Optical encoder

2007-05-29

2007-05-29

Epps, Georgia (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S23700G, C341S013000, C356S614000

Reexamination Certificate

active

10911640

ABSTRACT:
An optical encoder comprising a light-receiving part having photodiodes equal in number to the common multiplier of a number of slits facing the light-receiving part and a number of movement information signals. Output terminals of the photodiodes are connected so that the movement information signals are respectively obtained by adding output signals of the plurality of photodiodes out of the photodiodes equal in number to the common multiplier. The twelve photodiodes are balancedly arranged corresponding to three slits and a light-receiving area of each photodiode is made smaller by subdiving each photodiode. The optical encoder suppress difference, distortion and variance of the movement information signals or the like obtained from the light-receiving part with the result that accurate movement information is obtained.

REFERENCES:
patent: 4654525 (1987-03-01), Ebina et al.
patent: 4691101 (1987-09-01), Leonard
patent: 6355927 (2002-03-01), Snyder
patent: 6590201 (2003-07-01), Ueda
patent: 6838654 (2005-01-01), Kuo et al.
patent: 6966623 (2005-11-01), Fo et al.
patent: 7002137 (2006-02-01), Thorburn et al.
patent: 2001-99684 (2001-04-01), None

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