Retroreflective photoelectric sensor

Details Retroreflective photoelectric sensor Retroreflective photoelectric sensor

2006-05-16

2006-05-16

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S216000, C359S485050, C369S112160

Reexamination Certificate

active

07045766

ABSTRACT:
A retroreflective photoelectric sensor may be of a biaxial type or of a coaxial type. A sensor of the biaxial type includes a light-emitting optical system having a light-emitting element, a first polarizer and a light-emitting lens arranged sequentially in this order, a light-receiving optical system having a light-receiving lens, a second polarizer and a light-receiving element arranged sequentially in this order, and a phase shifter inserted between the first polarizer and the light-emitting lens of the light-emitting optical system. The polarizer axes of the first and second polarizers are mutually perpendicular. A phase shifter such as a ½ wave plate may further be placed between the first polarizer and the light-emitting lens of the light-emitting optical system.

REFERENCES:
patent: 5574595 (1996-11-01), Kurata et al.
patent: 5687153 (1997-11-01), Komma et al.
patent: 2001-41724 (2001-02-01), None

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