Reflection-type photoelectric switch, fresnel lens and method of

Details Reflection-type photoelectric switch, fresnel lens and method of Reflection-type photoelectric switch, fresnel lens and method of

1990-02-15

1992-08-25

Sugarman, Scott J.

Optical: systems and elements

Lens

With multipart element

359711, 359868, G02B 306, G02B 510

Patent

active

051424169

ABSTRACT:
A reflective-type photoelectric switch projects emitted light from a light-emitting element toward a detection zone by a light-projecting optical system, and guides reflected light from an object to be detected in the detection zone to a light-receiving element by a light-receiving optical system. A special optical element is used in part of at least one of the two optical systems. The optical element functions to diverge light in a direction parallel to a plane containing the optic axes of the light-emitting and light-receiving elements, and condense light in a direction perpendicular to the same plane. As a result, it is possible to detect, with excellent sensitivity, both an object which is far from the switch and an object very near the switch.

REFERENCES:
patent: 3470423 (1969-09-01), Larew
patent: 4203652 (1980-05-01), Hanada

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