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Patent EP0337429A2 successfully refreshed from Google Patents.
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EP0337429A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Ink jet head

Assignee: Seiko Epson Corp
•
Filing: 1989-04-12
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Granted: —
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Expires: 2009-04-12
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Abstract

Abstract An ink jet head for an ink jet recording apparatus has a nozzle forming substrate (30) in which a plurality of nozzles (31) are formed. A piezoelectric transducer (20) comprising a plurality of vibrators (21) is disposed opposite to the nozzle forming substrate (30) and a gap is formed between the nozzle forming substrate (30) and the vibrators (21). The width (a) of the gap in a first area near to and around said nozzles (31) is different from the width (b) of said gap in a remaining second area. By appropriately dimensioning the width in the first area and that in the second area, it is possible to control the ejection pressure generation characteristic and the periodic damping characteristic of the vibrators independently from each other.

Inventors

  • 👤 Tsuyoshi C/O Seiko Epson Corporation Kitahara
  • 👤 Shuji C/O Seiko Epson Corporation Yonekubo
  • 👤 Hideki C/O Seiko Epson Corporation Morozumi
  • 👤 Koichi C/O Seiko Epson Corporation Higashimura
  • 👤 Masanao C/O Seiko Epson Corporation Matsuzawa

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 17:26
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/16; B41J2/1607; B41J2/1614; B41J2/14; B41J2/14201; B41J2/14282; B41J2/162; B41J2/1621; B41J2/1623; B41J2/1625; B41J2/1626; B41J2/164; B41J2/1643; B41J2002/14387; B41J2002/14475

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 102 words
An ink jet head for an ink jet recording appara­tus, having a nozzle forming substrate (30) in which a plurality of nozzles (31) are formed, and a piezoelectric transducer (20) comprising a plurality of vibrators (21), each disposed opposite to a corresponding nozzle (31) and drivable independently from each other, a gap being formed between the nozzle forming substrate (30) and the vibrators (21) and filled with ink, characterized in that the width (a) of the gap in a first area near to and around said nozzles (31) is different from the width (b) of the gap in a remaining second area.
Claim 2
Dependent Claim 102 words
An ink jet head for an ink jet recording appara­tus, having a nozzle forming substrate (30) in which a plurality of nozzles (31) are formed, and a piezoelectric transducer (20) comprising a plurality of vibrators (21), each disposed opposite to a corresponding nozzle (31) and drivable independently from each other, a gap being formed between the nozzle forming substrate (30) and the vibrators (21) and filled with ink, characterized in that the width (a) of the gap in a first area near to and around said nozzles (31) is different from the width (b) of the gap in a remaining second area.
Claim 3
Dependent Claim 52 words
The ink jet head according to claim 1, wherein each vibrator (21) has at least one end fixed, and wherein said first area has a length from the position of a nozzle (31) toward said fixed vibrator end, corresponding to half or less than half the width (B) of said vibrators (21).
Claim 4
Dependent Claim 71 words
The ink jet head according to claim 1 or 2, where­in the width (a) of the gap in said first area is smaller than that (b) in the second area, when the viscosity of the ink is more than 5mPas, and that the width (a) of the gap in said first area is larger than that (b) of said second area, when the viscosity of the ink is 5mPas or less.

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