Inkjet recording apparatus

Details Inkjet recording apparatus Inkjet recording apparatus

2005-02-09

2008-11-18

Meier, Stephen D (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S068000

Reexamination Certificate

active

07452049

ABSTRACT:
An ink non-ejection detecting circuit device for an inkjet recording apparatus is disclosed which comprises a bridge circuit including a piezoelectric head having a piezoelectric element, a first resistor connected in series to the piezoelectric head, a capacitor provided outside the piezoelectric head, and a second resistor connected in series to the capacitor. A differential voltage that appears between the piezoelectric head and the first resistor and between the capacitor and the second resistor is amplified, so that the acoustic-system admittance of the piezoelectric head can be detected with a high SN ratio.

REFERENCES:
patent: 4172991 (1979-10-01), Akamatsu et al.
patent: 4467271 (1984-08-01), Ruckenbauer et al.
patent: 5500657 (1996-03-01), Yauchi et al.
patent: 2000-318183 (2000-11-01), None
patent: 2000-355100 (2000-12-01), None
patent: 2003-118093 (2003-04-01), None

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