Actuator

By designing a recessed structure on the support, the problem of controlling the thickness and volume of the adhesive was solved, achieving stress dispersion and improved vibration characteristics, thus ensuring the stability and reliability of the actuator.

CN121751967APending Publication Date: 2026-03-27MURATA MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-26
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

In the prior art, the thickness and volume of the adhesive between the piezoelectric element and the support are difficult to control, leading to stress concentration and adverse effects on vibration characteristics.

Method used

The ring support design reduces stress concentration by forming a recess on the inner circumference of the support, and uses a high-rigidity material to fix the piezoelectric vibrator, avoiding the use of thick adhesives.

Benefits of technology

It effectively suppressed stress concentration, reduced the adverse effects of vibration characteristics, and improved the vibration stability and reliability of the actuator.

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Abstract

An actuator is provided with a piezoelectric vibrating body (100) and a support body (ST1). The piezoelectric vibrating body is composed of a laminated body including a plate member (31) and a piezoelectric element (21), and has a first main surface and a second main surface facing each other. The support body (ST1) has a ring shape in plan view and has a predetermined thickness. The support body (ST1) is provided with a ring-shaped inner peripheral surface (FiST1) and an outer peripheral surface (FeST1), and a surface (FST11) and a surface (FST12) which are connected to the inner peripheral surface (FiST1) and the outer peripheral surface (FeST1) and face each other. The surface (FST12) is fixed to the first main surface of the piezoelectric vibrating body. The support body (ST1) is provided with a thin portion at a position between a surface (FST11) and a surface (FST12) in the thickness direction, and in the thin portion, the distance between an inner peripheral surface (FiST1) and an outer peripheral surface (FeST1) is shortened, the inner peripheral surface (FiST1) being formed by recessing the inner peripheral surface (FiST1).
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Citation Information

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