LED printhead with post lens optical feedback and method of cont

Details LED printhead with post lens optical feedback and method of cont LED printhead with post lens optical feedback and method of cont

1989-07-03

1991-03-05

Reynolds, Bruce A.

Recorders

Light or beam recording

Including record receiver or handling means therefor

346160, 350171, G01D 1514, G02B 2714

Patent

active

049981188

ABSTRACT:
An LED printer apparatus or the like and method of controlling same is described wherein a sensor is provided at the focal plane of a lens means used to focus light from the LED's onto a film. This allows the sensor to provide corrections during actual printing operations. In response to the light sensed, adjustments are made by altering drive current to the LED's and/or changing the duration of an exposure period.

REFERENCES:
patent: 2735337 (1956-02-01), Frischmann
patent: 2809555 (1957-10-01), Kossel
patent: 3787888 (1974-01-01), Haskal
patent: 4757327 (1988-07-01), Henzi
patent: 4855760 (1989-08-01), Kanayama
patent: 4885597 (1989-12-01), Tschang et al.

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