Control circuit for an ink jet printing element and a method of

Details Control circuit for an ink jet printing element and a method of Control circuit for an ink jet printing element and a method of

1986-05-02

1988-05-10

Goldberg, E. A.

Recorders

Markers and/or driving means therefor

With ink supply to marker

400126, G01D 1516

Patent

active

047439246

ABSTRACT:
A control circuit (17) applies a voltage pulse to a piezoelectric transducer (16) to create pressure in a chamber (10) open to an ink reservoir (14) at one end and closed by an ink nozzle (13) at the other. The control circuit (17) generates a pulse formed by one or two waves, each comprising a secondary portion delayed relative to the primary portion by a time which is double the reflection time that is characteristic of the chamber (10), thereby cancelling reflection of the drop expulsion pressure. The form of the wave is determined by a series of variable resistors disposed in the circuit while the time is regulated by an element for regulating the period of oscillation of the circuit. Alternatively the form of the wave is recorded in digital form in an ROM addressed by a counter while the period of oscillation is regulated by acting on a timer for controlling the counter.

REFERENCES:
patent: 3832259 (1974-08-01), Van Zon
patent: 4112433 (1978-09-01), Vernon
patent: 4424520 (1984-01-01), Matsuda et al.
patent: 4485386 (1984-11-01), Dagna et al.
patent: 4491851 (1985-01-01), Mizuno et al.
patent: 4498089 (1985-02-01), Scardovi
patent: 4528578 (1985-07-01), Balbo
patent: 4528579 (1985-07-01), Brescia
patent: 4535346 (1985-08-01), Lichti
patent: 4560998 (1985-12-01), Wimmer
patent: 4630072 (1986-12-01), Scardovi et al.
Olivetti, Research & Technology Review, No. 2, 1984.

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