Photodetector having an integrated function for elimination of the effects of stray light
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United States of America Patent
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Feb 9, 1999
Grant Date -
N/A
app pub date -
Mar 14, 1997
filing date -
Sep 16, 1994
priority date (Note) -
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Abstract
A photodetector for measuring the position of an incident light beam on an active surface area of the detector includes an inactive area and a concentric stray light absorbing area, both of which outwardly surround the light-absorbing active area. All light incident on the stray light-absorbing area and the inactive area will generate a photoelectric current which is conducted to an earth ground via an electrode in the stray-light area. An electrical signal from the active area representing a position of the measured light in the active area will be unaffected by any stray light incident on the detector externally of the active area.
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