(19)
(11) EP 0 897 803 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.03.1999 Bulletin 1999/10

(43) Date of publication A2:
24.02.1999 Bulletin 1999/08

(21) Application number: 98120935.6

(22) Date of filing: 14.10.1994
(51) International Patent Classification (IPC)6: B41J 2/14, B41J 2/16
(84) Designated Contracting States:
DE GB

(30) Priority: 14.10.1993 JP 280371/93
25.05.1994 JP 111312/94

(62) Application number of the earlier application in accordance with Art. 76 EPC:
94929664.4 / 0723866

(71) Applicant: CITIZEN WATCH CO. LTD.
Shinjuku-Ku Tokyo 163-04 (JP)

(72) Inventor:
  • Osawa, Seiichi c/o Citizen Watch Co., Ltd.
    Tokorozawa-shi Saitama 359 (JP)

(74) Representative: Prüfer, Lutz H., Dipl.-Phys. et al
PRÜFER & PARTNER, Patentanwälte, Harthauser Strasse 25d
81545 München
81545 München (DE)

 
Remarks:
This application was filed on 04 - 11 - 1998 as a divisional application to the application mentioned under INID code 62.
 


(54) Ink-jet head and methods of manufacturing and driving the same


(57) An ink-jet head is provided, comprising a base plate (11), a plurality of partitions (10) formed by laminating a plurality of plate-shaped piezoelectric material layers (1a - 1c) polarized in a direction of thickness with conductive material layers (2a - 2d) interposed among them, a cover (14), and a sealing member (22), wherein said plural partitions (10) are arranged with given gaps (20, 21, 29) interposed between them on said base plate (11) said gaps (20, 21, 29) being closed by said cover (14) at upper portions thereof and by said sealing member (22) at side portions thereof to form pressurizing chambers (15), and a nozzle hole (23) is formed at a portion of each of said pressurizing chambers (15), and said partitions (10) are laminated piezoelectric actuators each of which has a piezoelectric strain coefficient d33 and is deformed in the direction of thickness when voltage is applied thereto.






Search report