Ink jet printer with high power, short duration pulse

Details Ink jet printer with high power, short duration pulse Ink jet printer with high power, short duration pulse

Filed on

1994-10-31

Date issued

1998-03-17

Examiner

Fuller, Benjamin R.

Patent Class

Incremental printing of symbolic information

SubClass

Ink jet

SubSubClass

Ejector mechanism

Other Related Categories

347 10, B41J 2938, B41J 205

Type

Patent

Status

active

Patent number

057292604

Description

ABSTRACT:
An ink ejection printer includes an ink channel filled with ink, a nozzle which brings the ink channel into fluid connection with an outside atmosphere, and a thermal resistor formed in the ink channel near the nozzle. The thermal resistor received a pulse of voltage, whereupon the thermal resistor rapidly heats so that a portion of the ink in the ink channel is rapidly vaporized by subcool boiling, which is caused by swing nucleation, to produce a bubble, expansion of the bubble ejecting an ink droplet from the nozzle. With the thermal resistor, boiling starts within 2 .mu.S after application of the pulse of voltage begins. The pulse of voltage is applied to the thermal resistor for a duration of 3 .mu.S or less. The bubble generated by application of the pulse of voltage to the thermal resistor disappears without the thermal resistor generating secondary bubbles. The bubble generated by application of the pulse of voltage of the thermal resistor disappears within 11 .mu.S after application of the pulse. Energy required to generate the bubble is 4 .mu.J/50.times.50 .mu.m.sup.2 or less.

REFERENCES:
patent: 4313124 (1982-01-01), Hara
patent: 4345262 (1982-08-01), Shirato et al.
patent: 4517444 (1985-05-01), Kawahito et al.
patent: 4646105 (1987-02-01), Matsumoto et al.
patent: 5206659 (1993-04-01), Sakurai et al.
patent: 5214450 (1993-05-01), Shimoda
patent: 5444475 (1995-08-01), Mitani
patent: 5479196 (1995-12-01), Inada
Norbert Elsner. "Convective Heat Transfer when Changing the Aggregate State" 1980, pp. 515-525.

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