Waterproof Sheet Extension for Acoustic Unit Mounting
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Solution Overview
Problem
Conventional waterproof structures for electronic devices with sound holes fail to maintain acoustic characteristics when using small-sized acoustic units, as the sheet member required for moisture blocking also causes breakage or failure due to direct contact with the unit.
Innovation Solution
Incorporating an extension portion that extends the mounting portion towards the inner periphery of the sheet member, allowing the acoustic unit to be mounted without direct contact, thus preventing breakage and maintaining the desired area for acoustic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small-sized acoustic unit is used to reduce device size, then the electronic device size is reduced, but the sheet member comes into direct contact with the acoustic unit causing breakage or failure
Solution Approach 1:
The mounting portion acts as an intermediary element between the acoustic unit and the sheet member. It provides a dedicated mounting surface that extends toward the acoustic unit, allowing the acoustic unit to be securely mounted while preventing direct contact between the acoustic unit and the sheet member, thus avoiding breakage or failure of the sheet member
Solution Approach 2:
The mounting portion extends in the depth direction (toward the acoustic unit) from the outer peripheral portion of the sheet member. This dimensional extension creates a separate mounting plane that spatially separates the acoustic unit from the sheet member, preventing direct contact while maintaining acoustic performance
2Volume of moving object
If the sheet member area is reduced to accommodate small-sized acoustic units, then device size is reduced, but acoustic characteristics such as sound pressure deteriorate
Solution Approach 1:
The mounting structure is segmented into two distinct parts: the sheet member that maintains acoustic characteristics, and the mounting portion that provides mechanical support. The mounting portion is circumferentially provided on the outer peripheral portion of the sheet member and extends toward the acoustic unit, allowing the sheet member to maintain its required area for acoustic performance while the mounting portion handles the mechanical mounting function
3Reliability
If the same sheet member area is used with small-sized acoustic units, then waterproofing is maintained, but the acoustic unit cannot be properly mounted due to direct contact causing breakage
Solution Approach 1:
The mounting portion is pre-formed on the sheet member before the acoustic unit is installed. This preliminary structure provides a ready-made mounting surface that guides and supports the acoustic unit installation, preventing direct contact between the acoustic unit and the sheet member, and eliminating the need for post-installation adjustments or repairs
Data Source
AI summary
An electronic device includes an outer case having a sound hole, an acoustic unit included in the outer case in a position corresponding to a position of the sound hole, a sheet member provided between the acoustic unit and the outer case in a position corresponding to the position of the sound hole, and placed over the acoustic unit to cover an outside of an outer edge of the acoustic unit, a mounting portion circumferentially provided on an outer peripheral portion of the sheet member and mounted to the outer case, and an extension portion that extends the mounting portion toward an inner periphery thereof on a side of the sheet member facing the acoustic unit and to which the acoustic unit is mounted.