Method and device for correcting shading in thermal printer

Details Method and device for correcting shading in thermal printer Method and device for correcting shading in thermal printer

1992-05-13

1994-11-08

Fuller, Benjamin R.

Recorders

Thermal recording

358298, B41J 235

Patent

active

053631250

ABSTRACT:
A thermal recording method and device for recording a half-tone image on a recording sheet, wherein each pixel includes a plurality of sub-lines, and a half-tone is produced by changing the number of the sub-lines where ink is recorded. According to a desirable tonal step, a number of drive pulses are applied to a thermal element for each pixel while the thermal element moves in a sub scan direction relative to the recording sheet, with one drive pulse corresponding to one sub-line. The width of the drive pulse corresponding to the first sub-line of each pixel is set longer than the other drive pulses for the following sub-lines, and is changed according to the pixel position in the sub scan direction. The width of the drive pulse for the first sub-line is the longest at the beginning of recording, and becomes shorter as the recording proceeds. The widths of the other drive pulses may be changed according to the sub-line position within each pixel.

REFERENCES:
patent: 4724446 (1988-02-01), Hirahara et al.
patent: 4821111 (1989-04-01), Nowell
patent: 4843408 (1989-06-01), Tanaka
patent: 4890121 (1989-12-01), Hirahara et al.

Affiliated with

Also associated with

Rating

Method and device for correcting shading in thermal printer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and device for correcting shading in thermal printer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for correcting shading in thermal printer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1785892