Thermal printing with improved temperature control

Details Thermal printing with improved temperature control Thermal printing with improved temperature control

1992-09-02

1994-12-20

Fuller, Benjamin R.

Recorders

Thermal recording

400719, B41J 29377, B41J 2375, B41J 232

Patent

active

053749448

ABSTRACT:
A thermal printer is disclosed in which an image is generated on a line-by-line basis with a printhead that is comprised of a plurality of individually activated resistor elements along its length. Uniformity of image intensity is achieved by carefully controlling an ambient temperature of the printing head. This control of ambient temperature is achieved with a cooling fin that is thermally coupled to the printhead. A duct surrounds the cooling fin and air is blown through the duct to transfer heat from the cooling fin. The shapes of the cooling fin and the duct are such that the printhead is maintained at a substantially uniform temperature along its length. A unit cross-sectional area of the duct and a unit surface area of the cooling fin vary along the length of the printhead in a accordance with the expression: Q=unit surface area of cooling fin/unit cross-sectional area of duct=k/L.sup.n, where k is a constant, L is a distance along the length of the printhead an n is a positive exponential power. In a preferred embodiment, n is between about 1.5 and 3.0.

REFERENCES:
patent: 4777560 (1988-10-01), Herrell et al.
patent: 4819011 (1989-04-01), Yokota
patent: 4896166 (1990-01-01), Barker et al.
patent: 4896168 (1990-01-01), Newman et al.
patent: 5083194 (1992-01-01), Bartilson
patent: 5099910 (1992-03-01), Walpole et al.

Affiliated with

Also associated with

Rating

Thermal printing with improved temperature control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Thermal printing with improved temperature control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal printing with improved temperature control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2388402