Watch Case Vibration Plate Gap for Sound Pressure
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Solution Overview
Problem
Conventional watch case devices with a metal back cover and piezoelectric ceramic plate exhibit undesirably low sound pressure due to the direct fixation of the back cover to the case body.
Innovation Solution
A watch case design featuring a cylindrical metal case body with a cover frame, cover plate, vibration plate, and piezoelectric ceramic plate, where the vibration plate is interposed between the cover plate and the case body, utilizing joining members to create gaps that enhance sound pressure characteristics and radio wave sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the back cover is directly fixed to the case body, then the structure is simple and easy to assemble, but the sound pressure becomes undesirably low
Solution Approach 1:
A vibration plate is introduced as an intermediary component between the back cover and the case body. The vibration plate is joined to the back cover by a third joining member, creating a spaced-apart configuration that allows the vibration plate to act as a mediator for sound wave transmission, thereby improving sound pressure while maintaining assembly simplicity through the use of joining members
2Device complexity
If the back cover is made of metal and directly fixed, then the structure is simple, but radio wave sensitivity is reduced
Solution Approach 1:
The vibration plate serves as an intermediary that separates the metal back cover from the case body, creating a spaced configuration that improves radio wave sensitivity while maintaining structural simplicity through the use of joining members rather than complex assemblies
Solution Approach 2:
The back cover assembly is segmented into multiple components (back cover, vibration plate, joining members) rather than being a single integrated piece, allowing for improved radio wave sensitivity while maintaining overall structural simplicity
3Device complexity
If the vibration plate is joined directly to the cover plate, then the structure is simple, but the vibration characteristics of the piezoelectric ceramic plate are compromised
Solution Approach 1:
The third joining member acts as an intermediary that joins the vibration plate to the cover plate while maintaining a spaced-apart configuration. This intermediary connection preserves the vibration characteristics of the piezoelectric ceramic plate by allowing it to vibrate freely without direct constraint from the cover plate, while still maintaining structural integrity
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 design improves sound pressure and radio wave sensitivity while maintaining impact resistance and ease of assembly, with the piezoelectric ceramic plate's vibration characteristics maintained through its assembly with the vibration plate, and the cover plate made of sapphire glass for increased module breaking strength.
Implementation Method 1
a piezoelectric ceramic plate (124) provided on the vibration plate (123)
Implementation Method 2
a vibration plate (123) provided in the housing space (11a)
Data Source
AI summary
According to one embodiment, a device includes: a case body including a cylindrical peripheral wall portion; a cover frame provided on one side of the peripheral wall portion of the case body and having an opening; a cover plate formed to have a plate shape and arranged in the opening of the cover frame; and an vibration plate joined to the cover plate by a third joining member, wherein the vibration plate and the cover plate are spaced apart from each other, with the third joining member interposed.