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Ink jet printing head

An inkjet print head and nozzle technology, applied in printing and other directions, can solve the problems of not allowing the formation of a buffer cavity and reducing the rigidity of the print head.

Inactive Publication Date: 2004-02-18
BROTHER KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this structure does not allow the formation of buffer chambers facing the ink manifolds in the manifold plate.
If a part of the manifold plate is made very thin in order for the pressure wave energy to vibrate the manifold plate, the stiffness of the print head is partially reduced and the ink ejection characteristics will vary from nozzle to nozzle

Method used

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Examples

Experimental program
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Embodiment Construction

[0017] will refer to Figures 1 to 4 An inkjet printhead 1 according to an embodiment of the present invention is explained. In this inkjet print head 1, a flexible flat cable 40 is bonded to the upper surface of a sheet-shaped piezoelectric actuator 8 to be connected with an external device, and the piezoelectric actuator 8 is bonded to a cavity unit 7 . Ink is ejected from nozzles opening on the lower surface of the chamber unit 7 .

[0018] will refer to figure 2 and image 3 The structure of the chamber unit 7 will be described. The cavity unit 7 is formed by laminating and bonding seven layers of sheets, namely a nozzle plate 9, a cover plate 10, a buffer plate 11, two manifold plates 12, 12, a partition plate 13, and a base plate 14. form. In this embodiment, each layer of plates 10, 11, 12, 12, 13, 14, except the nozzle plate 9, is made of 42% nickel steel and has a thickness of about 50-150 microns. Openings and grooves are formed in these plates as ink channel...

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Abstract

A cavity unit of an ink-jet printhead is formed by laminating a base plate formed with pressure chambers , a spacer plate , a manifold plate, a damper plate , a cover plate , and a nozzle plate formed with nozzles . The manifold plate is formed with a manifold chamber that penetrates through the manifold plate. The damper plate is formed with a recess on a side facing away from the manifold chamber and a damper wall left on a side facing the manifold chamber to have a partial thickness of the damper plate. The damper plate is bonded to the manifold plate on an opposite side from the base plate such that the damper wall is positioned to face the manifold chamber. The cover plate is bonded to the manifold plate to seal the recess. Because the damper plate is relatively thick while the damper wall is thin enough to absorb a pressure wave in the manifold chamber generated upon ink ejection, the damper plate is easy to handle.

Description

technical field [0001] The present invention relates to a piezoelectric inkjet print head having a cavity unit comprising a foil with a buffer wall. Background technique [0002] As disclosed in U.S. Patent No. 5,943,079 (which is incorporated herein by reference), a prior art on-demand inkjet printhead includes an orifice plate, a piezoelectric sheet, and an The vibrating piece (elastic membrane) between them acts as a vibrating membrane. Nozzles, pressure chambers communicating with the respective nozzles, and ink manifolds communicating with the pressure chambers to supply ink thereto are formed on the orifice plate. The piezoelectric sheet has an energy generating portion, such as a piezoelectric element, selectively driven to pressurize the ink in the pressure chamber to eject the ink through the nozzle. [0003] When the energy generating part is driven, the corresponding pressure chamber is squeezed and the pressure is transmitted to the corresponding nozzle, and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/045B41J2/055B41J2/14B41J2/16
CPCB41J2/14209B41J2002/14306B41J2002/14225B41J2002/14419B41J2/055B41J2002/14217
Inventor 伊藤敦
Owner BROTHER KOGYO KK
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