Electrophotographic image forming apparatus with non-uniformity

Details Electrophotographic image forming apparatus with non-uniformity Electrophotographic image forming apparatus with non-uniformity

1993-04-01

1996-02-20

Fuller, Benjamin R.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

358298, 395115, G06F 1500, B41J 2435, H04N 1407

Patent

active

054933226

ABSTRACT:
An electrophotographic printer uses plural recording elements such as LEDs for grey level recording. Redundant memory tables are provided that store redundant, but different, correction factors for correcting for nonuniformities of the LEDs at different grey levels. A nonlinear exposure clocking system is also provided for generating clock pulses at non-uniform intervals for use in controlling exposure durations for recording pixels. The clocking system includes a memory for storing binary signals that may be clocked out of a register and used as exposure clock pulses. The clock memory also includes redundant, but different, sets of possible clock pulses. As each new line of data is recorded, a signal is used to select one of the redundant sets of correction factors and a corresponding one of the redundant sets of exposure clock pulses. The use of this line-by-line change of exposure conditions tends to minimize production of image artifacts as errors in exposure by a particular LED are not continued from recording line to recording line.

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IBM Technical Disclos. Bulletin vol. 12, No. 4, p. 614 (Sep. 1969), Johnson et al.

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