Light emission intensity width compensating method of LED print

Details Light emission intensity width compensating method of LED print Light emission intensity width compensating method of LED print

1995-08-21

1998-06-30

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347246, B41J 247

Patent

active

057741654

ABSTRACT:
The present invention is a light emission intensity width compensating method of an optical print head having a large number of light emitting devices, comprising the steps of measuring a light emission intensity distribution of each of the light emitting devices of the optical print head, slicing the distribution corresponding to a reference light emission intensity value, calculating a light emission intensity width of the reference light emission intensity value for each of the light emitting devices, designating a compensation value of drive energy so that each of the light emission intensity widths becomes equal, and causing each light emitting device to emit light corresponding to the compensation value of the drive energy. In addition, the present invention is an apparatus corresponding to the light emission intensity compensating method. The compensation values of the drive energy are stored in a storing means of the apparatus. When data is printed, the light emitting devices of the optical print head are lit corresponding to the compensation value of the drive energy. Thus, the drive energy is varied corresponding to the light emission intensity width. Consequently, a dot image can be printed free of uneven density.

REFERENCES:
patent: 4857944 (1989-08-01), Hart et al.
patent: 5140157 (1992-08-01), Ohshima et al.
patent: 5586055 (1996-12-01), Ng et al.

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