[54] DRIVING DEVICE FOR
ELECTROSTRICTIVE INK-JET PRINTER
HEAD HAVING CONTROL CIRCUIT WITH
SWITCHING ELEMENTS FOR SETTING
ELECTRICAL POTENTIAL RANGES OF
POWER SUPPLY TO ELECTRODES OF THE
PRINTER HEAD
[75] Inventors: Noboru Nitta; Shunichi Ono; Jun
Takamura, all ol Shizuoka-ken, Japan
[73] Assignee: Toshiba Tec Kabushiki Kaisha, Tokyo, Japan
[21] Appl. No.: 08/763,232
[22] Filed: Dec. 10, 1996
[30] Foreign Application Priority Data
Dec. 14, 1995 [JP] Japan 7-325751
Sep. 19, 1996 [JP] Japan 8-248256
Nov. 6, 1996 [JP] Japan 8-293550
[51] Int. C I. B41J 29/38
[52] U.S. CI 347/9; 347/10
[58] Field of Search 347/9, 10, 11,
347/68-72, 12
[56] References Cited
U.S. PATENT DOCUMENTS
5,028,812 7/1991 Bartky .
FOREIGN PATENT DOCUMENTS 0341929 A2 11/1989 European Pat. Off. .
A head driving device has first MOS field effect transistors connected between a VDD power supply terminal and electrodes, and second MOS field effect transistors connected between a VSS power supply terminal and the electrodes. In the driving device, ink is ejected from each ink chamber due to the variation in pressure which is caused by charging and discharging ol corresponding capacitances each across an electrode ol the predetermined ink chamber and electrodes ol ink chambers adjacent to the predetermined ink chambers. Both ol the first MOS field effect transistors and second MOS field effect transistors are formed on one semiconductor substrate. T the potential ol the semiconductor substrate is set to be out ol a range between the potentials ol the VDD and VSS power supply terminals.
9 Claims, 9 Drawing Sheets
