Ink-jet print head having improved thermal uniformity

Details Ink-jet print head having improved thermal uniformity Ink-jet print head having improved thermal uniformity

1995-01-18

1997-06-03

Lund, Valerie

Incremental printing of symbolic information

Ink jet

Controller

347 18, 347 88, B41J 2938

Patent

active

056359640

ABSTRACT:
An improved media-width phase-change ink-jet print had (102) maintains a uniform temperature across its width to produce consistent drop mass and uniform print quality. The print head uses a heater (120) including two separately controlled, overlapping heating zones (154). The heating zones produce heat gradients (170, 172) that have maximum outputs toward opposing edges (168a, 168b) of the print head and are controlled in response to thermistors (138s, 168b) positioned at the corresponding edges. The two heating zones together produce a linear heat gradient (180) across the print heat to compensate for uneven head-to-drum spacing (166) and other unsymmetrical thermal loads on the print head. The improved print head also includes baffles (192) that reduce air flow between the head and the attached reservoir (118), and thermal breaks (218) that insulate the section (220) of the head that includes the jets from the thermal gradients at the edges of the print head.

REFERENCES:
patent: 4395146 (1983-07-01), Arai
patent: 5175565 (1992-12-01), Ishinaga et al.
patent: 5270730 (1993-12-01), Yaegashi et al.
patent: 5285049 (1994-02-01), Fukumoto et al.
patent: 5424767 (1995-06-01), Alavizadeh et al.

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