Typewriting machines – Typing by other than type-face or type-die – Thermal
Patent
1997-06-25
1998-08-18
Eickholt, Eugene H.
Typewriting machines
Typing by other than type-face or type-die
Thermal
347 3, 347 15, 358520, 395131, B41J 236
Patent
active
057950822
ABSTRACT:
The present invention utilizes a high-density ink and a low-density ink with respect to a specific color ink, so as to improve the printing quality. The procedure of the present invention reads a recording ratio of deep dots by the high-density ink corresponding to input tone data from a table and determines whether or not deep dots by the high-density ink are to be formed in a target pixel. In case that deep dots are to be formed, a piezoelectric element PE on a head of the high-density ink is driven to form deep dots. In case that deep dots are not to be formed, on the other hand, the procedure determines whether or not light dots by the low-density ink are to be formed in the target pixel by referring to the table, and specifies the on/off state of the light dots in order to cause a mean recording ratio of the light dots to be equal to a predetermined value. In the table, formation of deep dots starts in the range of tone data smaller than the specific value of tone data that gives a maximum recording ratio of light dots resulting in smooth color mixture at a joint between the record with light dots and the record with deep dots. The recording ratio of light dots may be varied according to the density of another color ink at a position corresponding to the target pixel as well as the density of the target color ink.
REFERENCES:
patent: 4560997 (1985-12-01), Sato et al.
patent: 4614967 (1986-09-01), Sayanagi
patent: 4811108 (1989-03-01), Numakura et al.
patent: 4959790 (1990-09-01), Morgan
patent: 5016097 (1991-05-01), Shimano
patent: 5146236 (1992-09-01), Hirata et al.
patent: 5315382 (1994-05-01), Tanioka
patent: 5345315 (1994-09-01), Shalit
patent: 5386305 (1995-01-01), Usami
patent: 5430469 (1995-07-01), Shioya et al.
patent: 5477246 (1995-12-01), Hirabayashi et al.
patent: 5572632 (1996-11-01), Laumeyer et al.
patent: 5611028 (1997-03-01), Shibasaki et al.
Kakutani Toshiaki
Shimada Kazumichi
Eickholt Eugene H.
Seiko Epson Corporation
LandOfFree
Printing system utilizing inks of different densities, cartridge does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Printing system utilizing inks of different densities, cartridge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Printing system utilizing inks of different densities, cartridge will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1109288