Piezoelectric Vibrator Terminal Layout for Larger Vibrating Area
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Solution Overview
Problem
Piezoelectric vibrators often have high production costs due to the use of metal- or glass-made lids, and there is a desire to improve vibration characteristics without increasing size.
Innovation Solution
A piezoelectric vibration device using resin-containing films to seal the driving electrodes, with metal films for mounting terminals formed on the outer surface of these films, allowing for larger vibrating portions and adequate mounting terminals without the need for high-priced bases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal- or glass-made lid members are used to seal the piezoelectric vibration piece, then sealing reliability is improved, but production cost increases
Solution Approach 1:
The patent replaces expensive metal or glass lid members with inexpensive resin sealing members that can be easily molded and attached. The resin sealing members perform the sealing function adequately without requiring the high durability and cost of metal or glass components, thus reducing production costs while maintaining acceptable sealing reliability.
Solution Approach 2:
The patent changes the material parameter of the sealing members from metal/glass to resin, and changes the structural parameter from a separate lid member to an integrated sealing structure attached to the base. This allows the sealing function to be achieved with lower-cost materials and simpler manufacturing processes.
2Reliability
If the vibrating portion is enlarged to improve vibration characteristics, then vibration performance is improved, but device size increases
Solution Approach 1:
The patent attaches the sealing members to the lower surface of the base, utilizing the vertical dimension rather than expanding the horizontal footprint. This allows the vibrating portion to be enlarged in the planar dimensions to improve vibration characteristics while the overall device size increase is minimized by using the thickness dimension for sealing.
Solution Approach 2:
The patent separates the sealing function from the base structure by using distinct sealing members attached to the base. This segmentation allows the base to be optimized for vibration characteristics with a larger vibrating portion, while the sealing function is provided by separate components that do not constrain the base dimensions.
3Ease of manufacture
If resin-containing films are used as sealing members, then production cost is reduced, but sealing durability may be compromised
Solution Approach 1:
The patent uses resin sealing members that can be composed of composite materials or multi-layer structures combining different resin types or resin with reinforcing materials. This allows the sealing members to achieve adequate durability for the application while maintaining low production costs through molded construction and material selection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces production costs and enhances vibration characteristics by eliminating the need for expensive lids and allowing for increased vibrating portion size without enlarging the device, while ensuring adequate mounting terminals are maintained.
Implementation Method 1
piezoelectric vibration plate including a vibrating portion having a first driving electrode and a second driving electrode
Data Source
AI summary
Metal films for first and second mounting terminals are formed at ends on both sides of a piezoelectric vibration plate across a vibrating portion, and first and second mounting terminals connected to these metal films are formed on outer surfaces of resin films adhered to the piezoelectric vibration plate. In case the metal films for first and second mounting terminals on both sides of the vibrating portion are desirably reduced in size in order to enlarge the vibrating portion, an adequate joining area for mounting purpose is still secured for the first and second mounting terminals formed on the outer surfaces of the resin films.