Diaphragm pump, liquid discharge head and liquid discharge device

The diaphragm pump design addresses the issue of joint strength reduction by separating the diaphragm's connection surfaces and using an electrode plate to mitigate vibration effects, improving fluid handling efficiency.

JP7864538B2Active Publication Date: 2026-05-25CANON KK
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Patent Information

Authority / Receiving Office
JP Β· JP
Patent Type
Patents
Current Assignee / Owner
CANON KK
Filing Date
2022-04-21
Publication Date
2026-05-25

AI Technical Summary

Technical Problem

Diaphragm pumps experience a decrease in joint strength between the diaphragm and the support member due to high-frequency vibrations, which are exacerbated by the bending deformation of the electrode plate, leading to reduced effectiveness in fluid intake and discharge.

Method used

The diaphragm pump design incorporates a space between the diaphragm and the support member, with the diaphragm joined at a second surface that is not connected to the first surface facing the space, and an electrode plate is provided between the piezoelectric element and the diaphragm to reduce the effect of diaphragm vibration.

Benefits of technology

This configuration suppresses the decrease in joint strength between the diaphragm and the support member, enhancing the pump's performance and stability during fluid intake and discharge.

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Abstract

To provide a diaphragm pump that restrains a decrease in joint strength between a diaphragm and a supporting member by decreasing the influence of vibration of the diaphragm, a liquid discharge head comprising the diaphragm pump, and a liquid discharge device.SOLUTION: A diaphragm pump 500 comprises a piezoelectric body 510, a diaphragm 506, and a supporting member 505. A space 503 is formed between the diaphragm 506 and the supporting member 505. The diaphragm pump 500 changes the volume of the space 503 by deforming the diaphragm 506, and thereby makes fluid flow. The diaphragm 506 has a first surface 22 to be deformed by deforming the piezoelectric body 510 out of surfaces facing the space 503, and a second surface 23 that is not connected to the first surface. The diaphragm 506 is joined to the supporting member 505 on the second surface 23.SELECTED DRAWING: Figure 3
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