LED printhead with droplet formed micro-lenslets and method for

Details LED printhead with droplet formed micro-lenslets and method for LED printhead with droplet formed micro-lenslets and method for

1990-05-14

1990-12-25

Reynolds, Bruce A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346107R, 350417, G01D 1514, B29D 1100, B41J 245

Patent

active

049807005

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 micro-lenslet incorporating 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. The micro-lenslet is formed by depositing a liquid polymeric binder in droplet form over the LED and having same set to form the lenslet in situ.

REFERENCES:
patent: 4678311 (1987-07-01), Loce
patent: 4776868 (1988-10-01), Trotter
patent: 4824195 (1989-04-01), Khoe

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