LED printhead temperature compensation

Details LED printhead temperature compensation LED printhead temperature compensation

1989-11-28

1990-08-28

Griffin, Donald A.

Recorders

Electric recording

Electrochemical

G01D 1514

Patent

active

049529498

ABSTRACT:
The light output of light emitting diodes on an LED printhead for a photosensitive printer is temperature compensated so that light output remains constant regardless of temperature changes of the LED chips. An LED chip has a plurality of exposure LEDs and a dummy LED. The voltage across the dummy LED is sensed and combined with an adjustable reference voltage. This provides the input to an op-amp, the output of which provides a chip reference voltage which controls the current to the LEDs.

REFERENCES:
patent: 4455562 (1984-06-01), Dolan et al.
patent: 4525729 (1985-06-01), Aguinek et al.
patent: 4571602 (1986-02-01), DeSchamphelaere et al.
patent: 4857944 (1989-08-01), Hart et al.
patent: 4878072 (1989-10-01), Reinten

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