Retroreflective photoelectric sensor

Details Retroreflective photoelectric sensor Retroreflective photoelectric sensor

2006-07-25

2006-07-25

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S216000, C359S485050, C369S112160

Reexamination Certificate

active

07081613

ABSTRACT:
A retroreflective photoelectric sensor has a light-emitting optical system having a light-emitting element and a first polarizer and serving to transmit light from the light-emitting element through the first polarizer, a light-receiving optical system having a second polarizer and a light-receiving element and serving to convert light received through the second polarizer into an electrical signal by the light-receiving element, the first and second polarizers having mutually perpendicular polarizer axes, a single lens for both emitting light from the light-emitting element and receiving light to the light-receiving element therethrough, a beam splitter serving to direct light received from the light-emitting optical system to the single lens and light received from the single lens to the light-receiving optical system, and a phase shifter inserted between the light-emitting optical system and the single lens.

REFERENCES:
patent: 5574595 (1996-11-01), Kurata et al.
patent: 5687153 (1997-11-01), Komma et al.
patent: 5883715 (1999-03-01), Steinlechner et al.
patent: 2005/0041558 (2005-02-01), Yamamoto et al.
patent: 2001-41724 (2001-02-01), None

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