Photoelectonic sensor

Details Photoelectonic sensor Photoelectonic sensor

2011-01-11

2011-01-11

Punnoose, Roy (Department: 2886)

Optics: measuring and testing

Of light reflection

Reexamination Certificate

active

07869048

ABSTRACT:
This invention provides a coaxial regressive reflection type photoelectronic sensor capable of enhancing detection accuracy. A sensor head includes a light emitting diode for emitting a detection light; a lens for converting the detection light to a parallel light and projecting the parallel light to an exterior as an external detection light; a half mirror for separating an optical path of the detection light and an optical path of a return light from the regressive reflection plate; and a photodiode for receiving the return light from the half mirror. The lens includes a convex surface formed to convert a signal light to a parallel light, and a plane tilted from a perpendicular direction with respect to the parallel light or an axis connecting a light emitting diode chip and a center portion of the convex surface. The reflected light of an external signal light at the plane passes a path different from that of the return light so as to be avoided from entering the photodiode chip.

REFERENCES:
patent: 7561330 (2009-07-01), Goto
patent: 10-255611 (1998-09-01), None
patent: 10-255612 (1998-09-01), None

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