Incremental printing of symbolic information – Ink jet – Controller
Patent
1994-08-01
1997-09-30
Tran, Huan H.
Incremental printing of symbolic information
Ink jet
Controller
347 17, 347 60, 347 14, B41J 207
Patent
active
056730691
ABSTRACT:
The volume of drops ejected from thermal ink jet printheads varies with the temperature of the printhead. The variation in drop volume degrades print quality by causing variations in the darkness in black and white text, the contrast of gray scale images, and variations in the chroma, hue, and lightness of color images. The present invention reduces the range of drop volume variation by reducing the range of printhead temperature variation during the print cycle by keeping the printhead temperature above a reference temperature. When the printhead temperature falls below the reference temperature during a print cycle the printhead is heated with nonprinting pulses.
REFERENCES:
patent: 4262188 (1981-04-01), Beach
patent: 4313684 (1982-02-01), Tazaki et al.
patent: 4490728 (1984-12-01), Vaught et al.
patent: 4510507 (1985-04-01), Ishikawa
patent: 4660057 (1987-04-01), Watanabe et al.
patent: 4791435 (1988-12-01), Smith et al.
patent: 4910528 (1990-03-01), Firl et al.
patent: 5036337 (1991-07-01), Rezanka
patent: 5107276 (1992-04-01), Kneezel et al.
patent: 5109234 (1992-04-01), Otis, Jr. et al.
patent: 5168284 (1992-12-01), Yeung
Canfield Brian
Holstun Clayton
Yeung King-Wah W.
Hewlett--Packard Company
Tran Huan H.
LandOfFree
Method and apparatus for reducing the size of drops ejected from 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 apparatus for reducing the size of drops ejected from, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for reducing the size of drops ejected from will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2260472