Uniform sensitivity light curtain

Details Uniform sensitivity light curtain Uniform sensitivity light curtain

1993-09-28

1996-07-23

Sikes, William L.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223B, 25022726, 25022728, 2502082, H01J 4014, G06M 700, G02B 2600

Patent

active

055391982

ABSTRACT:
A light curtain having linearly arranged pairs of light transmitting and receiving which may be placed on opposing sides of a zone to be protected. The light curtain provides uniform sensitivity across the region to be protected as the light transmitters emit a light beam which begins as an omnidirectional point source which is truncated and refocused by an optical lense. Predetermined portions of the beam are blocked to assure uniform intensity across the width of the transmitter.

REFERENCES:
patent: 3970846 (1976-07-01), Schofield, Jr. et al.
patent: 4029957 (1977-06-01), Betz et al.
patent: 4402609 (1983-09-01), Fetzer et al.
patent: 4431309 (1984-02-01), Sick et al.
patent: 4864121 (1989-09-01), Pietzsch
patent: 4875761 (1989-10-01), Fetzer
patent: 4893120 (1990-01-01), Doering et al.
patent: 5008530 (1991-04-01), Ball
patent: 5015840 (1991-05-01), Blau
patent: 5080457 (1992-01-01), Fetzer et al.

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