Method and apparatus for maintaining constant drop size mass in

Details Method and apparatus for maintaining constant drop size mass in Method and apparatus for maintaining constant drop size mass in

1993-06-25

1995-06-06

Hartary, Joseph W.

Incremental printing of symbolic information

Ink jet

Controller

347 19, B41J 205

Patent

active

054226643

ABSTRACT:
A Thermal ink jet printer has a rotatable platen with an oscillator circuit mounted therein which includes a resonant vibratory device on which the ink droplets ejected from the printhead nozzles by electrical pulses are received and the mass thereof are measured. A piezoelectric sensor, such as a quartz crystal, serves as an environment for measuring the mass of ink droplets deposited on the crystal face. The difference in frequency before and after drop deposition is exactly proportional to the ink drop mass. Frequency change is measured to provide a feedback signal to the printer controlled for adjustment of the droplet ejecting pulses to control the drop size.

REFERENCES:
patent: 4323905 (1982-04-01), Reitberger
patent: 4788466 (1988-11-01), Paul et al.
patent: 4835435 (1989-05-01), Yeung
patent: 4872028 (1989-10-01), Lloyd
patent: 5036337 (1991-07-01), Rezanker
patent: 5107276 (1992-04-01), Kneezel et al.

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