Automatic LED printbar uniformity and adjustment

Details Automatic LED printbar uniformity and adjustment Automatic LED printbar uniformity and adjustment

1995-08-11

1997-09-16

Yockey, David F.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347238, 347130, 347132, B41J 2435, B41J 245

Patent

active

056685874

ABSTRACT:
Uniformity light output of an LED printbar is achieved by a technique which senses the operational on time of each LED. When the on time difference between the LED with the longest on time and the LED with the shortest on time exceeds a predetermined value, the outputs of at least some LEDs comprising the printbar are compensated for to normalize their light output. This normalization is achieved via a drive circuit which drives each LED based upon correction data, and by determining an update of the correction data based upon the difference between the on time of individual LEDs. The correction data is determined when the difference between the on time of the LED with the longest on time and the on time of the LED with the shortest on time exceeds a predetermined maximum difference.

REFERENCES:
patent: 4525729 (1985-06-01), Agulnek et al.
patent: 4689694 (1987-08-01), Yoshida
patent: 4706130 (1987-11-01), Yamakawa
patent: 4799071 (1989-01-01), Zeise et al.
patent: 4882621 (1989-11-01), Suzuki et al.
patent: 4982203 (1991-01-01), Uebbing et al.
patent: 5016027 (1991-05-01), Uebbing
patent: 5025322 (1991-06-01), Ng
patent: 5126759 (1992-06-01), Small et al.
patent: 5138337 (1992-08-01), Ng

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