Uniform sensitivity light curtain
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United States of America Patent
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Jul 23, 1996
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N/A
app pub date -
Sep 28, 1993
filing date -
Sep 28, 1993
priority date (Note) -
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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.
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