Photo sensor having sectioned lens

Details Photo sensor having sectioned lens Photo sensor having sectioned lens

1995-06-06

1997-04-22

Le, Que

Radiant energy

Photocells; circuits and apparatus

Housings

2502141, H01J 502

Patent

active

056231431

ABSTRACT:
The photo sensor of the present invention is comprised of a photo sensing element for receiving a predetermined light and converting it into an electrical signal; a package for sealing the photo sensing element; and a lens arranged at the front surface of the package so as to collect light within a predetermined range in vertical and lateral directions to the photo sensing element, wherein a shape of the lens is set such that a curvature of the upper segment in the vertical direction is larger as compared with that of the lower segment, and only the requisite signal can be received without being influenced by the disturbance light or the like so as to prevent any erroneous operation.

REFERENCES:
patent: 4024397 (1977-05-01), Weiner
patent: 4657352 (1987-04-01), Suda et al.
patent: 4864137 (1989-09-01), Klein

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