Title:
ELECTROSTATIC ACTUATOR, ITS MANUFACTURING METHOD, AND LIQUID INJECTION DEVICE USING THEM
Document Type and Number:
WIPO Patent Application WO/1999/047357
Kind Code:
A1
Abstract:
An electrostatic ink jet head (1) using an electrostatic actuator and its manufacturing method, comprising pressure chambers (6) communicating with ink nozzles (21) and an atmospheric pressure chamber (12) open to the atmosphere, wherein diaphragms (5) are formed on the bottom surfaces of the pressure chambers (6), a voltage is applied between the diaphragms (5) and electrodes (43) to vibrate the diaphragms (5) electrostatically so as to inject ink droplets, vibration chambers (41) communicate with a pressure compensating chamber (49), a displacement plate (16) which is displaceable toward the outside of the bottom surface of the pressure compensating chamber (49) according to a variation in atmospheric pressure is formed on the bottom surface of the pressure compensating chamber (49), the volume of the pressure compensating chamber (49) is increased or decreased according to the displacement of the displacement plate (16) so that the inside pressure of each vibration chamber (41) communicating with the pressure compensating chamber (49) is regulated to the atmospheric pressure, whereby the vibration characteristics of the diaphragms (5) can be kept constant even if the atmospheric pressure is varied so as to maintain an appropriate ink-droplet injecting operation.
Inventors:
FUJII MASAHIRO (JP)
MARUYAMA HIROYUKI (JP)
SATO KAZUHIKO (JP)
KITAHARA KOJI (JP)
MAKIGAKI TOMOHIRO (JP)
NOJIMA SHIGEO (JP)
TAKEKOSHI TARO (JP)
MARUYAMA HIROYUKI (JP)
SATO KAZUHIKO (JP)
KITAHARA KOJI (JP)
MAKIGAKI TOMOHIRO (JP)
NOJIMA SHIGEO (JP)
TAKEKOSHI TARO (JP)
Application Number:
PCT/JP1999/001341
Publication Date:
September 23, 1999
Filing Date:
March 17, 1999
Export Citation:
Assignee:
SEIKO EPSON CORP (JP)
FUJII MASAHIRO (JP)
MARUYAMA HIROYUKI (JP)
SATO KAZUHIKO (JP)
KITAHARA KOJI (JP)
MAKIGAKI TOMOHIRO (JP)
NOJIMA SHIGEO (JP)
TAKEKOSHI TARO (JP)
FUJII MASAHIRO (JP)
MARUYAMA HIROYUKI (JP)
SATO KAZUHIKO (JP)
KITAHARA KOJI (JP)
MAKIGAKI TOMOHIRO (JP)
NOJIMA SHIGEO (JP)
TAKEKOSHI TARO (JP)
International Classes:
B41J2/14; B41J2/16; (IPC1-7): B41J2/045; B41J2/055
Foreign References:
| JPH1044407A | 1998-02-17 | |||
| JPH1016210A | 1998-01-20 | |||
| JPH09314837A | 1997-12-09 | |||
| JPH0655732A | 1994-03-01 | |||
| JPH04284255A | 1992-10-08 |
Other References:
See also references of EP 0985533A4
Attorney, Agent or Firm:
Suzuki, Kisaburo (Owa 3-chome Suwa-shi Nagano-ken, JP)
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