Optical line printhead and an LED chip used therefor
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United States of America Patent
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Nov 4, 1997
Grant Date -
N/A
app pub date -
Jun 6, 1995
filing date -
Nov 15, 1990
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A light emitting diode chip includes a substrate carrying thereon a number of light emitting diodes aligned in a row to form an array for producing a number of optical beams parallel to each other in a first direction, and monitoring element provided monolithically on the substrate for detecting the power of the optical beams produced by the light emitting diodes, wherein the monitoring element includes: a reference light emitting diode having a structure identical to the light emitting diodes in the array for producing an optical beam in a second direction perpendicular to the first direction; and a photodiode having a structure identical to the light emitting diodes in the array and separated from the reference light emitting diode by an isolation groove for detecting the optical beam produced by the reference light emitting diode.
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