Optical line printhead and an LED chip used therefor

Details Optical line printhead and an LED chip used therefor Optical line printhead and an LED chip used therefor

1995-06-06

1997-11-04

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

372 45, 372 46, B41J 247

Patent

active

056845235

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.

REFERENCES:
patent: 4159452 (1979-06-01), Logan et al.
patent: 4408331 (1983-10-01), Hartman et al.
patent: 4661961 (1987-04-01), Nelson et al.

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