Ink jet recording apparatus

Details Ink jet recording apparatus Ink jet recording apparatus

1995-06-30

1998-10-06

Metjahic, Safet

Incremental printing of symbolic information

Ink jet

Controller

347 70, B41J 2938, B41J 2045

Patent

active

058184724

ABSTRACT:
An ink jet recording apparatus provided with: an ink jet recording head having a pressurizing chamber communicated with a nozzle opening and a common ink chamber, and a piezoelectric vibrating plate which is formed at a surface of the pressurizing chamber and deflection-displaced, the head being caused to eject an ink drop by the deflection displacement of the piezoelectric vibrating plate; a charging circuit which supplies a current to the piezoelectric vibrating plate in response to a print signal, thereby producing the deflection displacement for ink ejection, and which outputs a signal for holding a charge final voltage during a fixed time period after an end of charge; and a discharging circuit which has a first discharge time constant suitable for sucking meniscus formed immediately after ink ejection toward the pressurizing chamber, thereby preventing the meniscus from being ejected from the nozzle opening, which stops discharge in a range which is (n+3/4) to (n+1) times (where n is 1, 2, 3, . . . , or 8) a natural vibration period T of the piezoelectric vibrating plate, and which conducts discharge at a second and different discharge time constant at an elapse of a predetermined time period.

REFERENCES:
patent: 5204695 (1993-04-01), Ishii
patent: 5510816 (1996-04-01), Hosono et al.
patent: 5521619 (1996-05-01), Suzuki et al.
patent: 5552809 (1996-09-01), Hosono et al.
patent: 5563634 (1996-10-01), Fujii et al.
patent: 5576743 (1996-11-01), Momose et al.
Patent Abstracts of Japan vol. 14, No. 478 (M-1036), Oct. 18, 1990, & JP-A-02 192947 (M. Hirozo), Jul. 30, 1990, *abstract*.
Patent Abstracts of Japan vol. 18, No. 173 (M-1581), Mar. 24, 1994 & JP-A-05 338164 (N. Tomoaki), Dec. 21, 1993, *abstract*.

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