Non-impact printhead using a mask with a dye sensitive to and ad

Details Non-impact printhead using a mask with a dye sensitive to and ad Non-impact printhead using a mask with a dye sensitive to and ad

1989-07-03

1990-12-25

Miller, Jr., George H.

Recorders

Light or beam recording

Including record receiver or handling means therefor

346160, 346 11, G01D 1514, B41J 245

Patent

active

049807013

ABSTRACT:
An LED printhead includes an optical mask overlying the LED's to balance light outputs therefrom. The transmission density of the mask is adjusted for each LED in accordance with its respective light output to adjust same so that the light outputs from all LED's are the same. The mask comprises a UV fadeable dye whose transmission density is adjusted with a UV laser or other light source while monitoring the light output from the respective LED. The transmission density of the mask may be adjusted by a UV light source provided on the printhead during periods of nonuse of the printhead or the printhead may be removed from the recording apparatus for adjustment.

REFERENCES:
patent: 3850517 (1974-11-01), Stephany et al.
patent: 4247799 (1981-01-01), Drexhage
patent: 4344691 (1982-08-01), Grant et al.
patent: 4378567 (1983-03-01), Mir
patent: 4749120 (1988-06-01), Hatada
patent: 4750010 (1988-06-01), Ayers et al.
patent: 4820013 (1989-04-01), Fuse
patent: 4827290 (1989-05-01), Yoritomo et al.

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