Regressive reflection type photoelectric switch

Details Regressive reflection type photoelectric switch Regressive reflection type photoelectric switch

2006-06-14

2008-08-26

Epps, Georgia Y. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S216000, C250S2140SW, C250S239000

Reexamination Certificate

active

07417217

ABSTRACT:
A concave curved surface95is formed on a light inputting surface93of a light emitting lens43, and a convex curved surface96is formed on a light emitting surface94. Only laser light close to an optic axis A is inputted to the concave curved surface95, and a spread angle is enlarged, and thereby, it is possible to make intensity distribution more uniform, and to reduce an error on the occasion of comparing a received light amount of reflected light with a threshold value, and therefore, even if a light receiving surface is small, it is possible to detect an object with high accuracy.

REFERENCES:
patent: 6249338 (2001-06-01), Ohtomo
patent: 2003/0214898 (2003-11-01), Ogata
patent: 2005/0135219 (2005-06-01), Oka
patent: 2006/0279867 (2006-12-01), Deguchi et al.
patent: A-10-255611 (1998-09-01), None
patent: A-2002-246636 (2002-08-01), None

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