Ink jet type recording head driving circuit

Details Ink jet type recording head driving circuit Ink jet type recording head driving circuit

1992-12-24

1995-06-20

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

310317, B41J 2045

Patent

active

054264545

ABSTRACT:
An ink jet type recording head driving circuit comprises: a capacitor which is connected through a first switching transistor and a charging time constant adjusting resistor to a power source, and grounded through a second switching transistor and a discharging time constant adjusting resistor; and a current buffer through which the terminal voltage of the capacitor is applied to a pressure generating member scanning switch circuit. In the circuit, a first pulse for contracting a pressure generating member forming the recording head is applied to the first switching transistor, and a second pulse for expanding the pressure generating member is applied to the second switching transistor, so that the pressure generating member is contracted at a rate set by the capacitor and the charging time constant adjusting resistor, to supply ink into the pressure chamber of the recording head, and then it is expanded at a rate set by the capacitor and the discharging time constant adjusting resistor.

REFERENCES:
patent: 4044297 (1977-08-01), Nobue et al.
patent: 4126867 (1978-11-01), Stevenson, Jr.
patent: 4352114 (1982-09-01), Kyogoku et al.
patent: 4459599 (1984-07-01), Ort
patent: 4577201 (1986-03-01), Murakami et al.
patent: 4697193 (1987-09-01), Hawkins
patent: 4717927 (1988-01-01), Sato

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