Speaker Grill Mounting via Elastic Sealing for Compact Audio Devices
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Solution Overview
Problem
Conventional audio devices with a bass reflex structure face sound and air leakage issues due to attachment holes for speaker grills, which impede the downsizing of electronic instrument cases and compromise the sealed acoustic space, leading to poor bass reflex performance.
Innovation Solution
An audio device design featuring a main body case with a through hole connected to an acoustic space, a cover member with a projection section inserted into the hole, and an elastic member that covers the projection section's end, ensuring the cover member is fixed to the main body case, thereby maintaining the sealed acoustic space and allowing for downsizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an attachment hole for speaker grill is provided penetrating to the acoustic space, then the speaker grill can be mounted on the outer side of the upper case, but sound and air leakage occurs from the attachment hole, causing the sealed state of the acoustic space to be compromised and bass reflex performance to deteriorate
Solution Approach 1:
A cover member is introduced as an intermediary component between the attachment hole and the acoustic space. The cover member includes a projection section that fits into the attachment hole and a distal end that extends into the acoustic space, effectively blocking sound and air leakage while maintaining the sealed state of the acoustic space.
Solution Approach 2:
An elastic member is used to cover the distal end of the projection section of the cover member. This elastic member can be made of flexible material that seals the opening while allowing for assembly and disassembly operations, maintaining the sealed state without compromising the ease of manufacture.
2Reliability
If the attachment hole is provided outside the acoustic space, then the sealed state of the acoustic space is maintained, but the device case cannot be downsized due to restricted positioning options
Solution Approach 1:
The cover member acts as an intermediary that enables the attachment hole to be positioned within the acoustic space while maintaining the sealed state. This provides greater flexibility in positioning the attachment hole, allowing for optimized device case dimensions and downsizing.
3Volume of moving object
If the cover member with projection section is inserted into the through hole, then the attachment hole can be positioned within the acoustic space enabling downsizing, but the cover member needs to be securely fixed to prevent leakage
Solution Approach 1:
The elastic member serves as a mediator that secures the cover member in place while maintaining the seal. The elastic member is elastically deformed during assembly to fit around the projection section, providing both fixation and sealing functions simultaneously.
Solution Approach 2:
The elastic member utilizes elastic deformation to change its physical state during assembly. By elastically deforming the member during insertion and allowing it to return to its original state, the cover member is securely fixed to the main body case while maintaining the sealed acoustic space.
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 effectively prevents sound and air leakage, enhances the bass reflex performance, and allows for the downsizing of electronic instrument cases by ensuring the attachment holes do not compromise the sealed acoustic space.
Implementation Method 1
an elastic member which covers the distal end of the projection section and whose at least one portion is arranged between the inner wall and the projection section in the through hole
Data Source
AI summary
An audio device and an electronic instrument are provided by which a device case can be downsized. An elastic member is interposed between an attachment hole provided in a panel-side sealed frame section of a speaker panel and a projection section of a speaker grill and, in this state, the speaker grill is fixed to the speaker panel by the projection section being subjected to torsion deformation. By the elastic member being deformed inside the attachment hole and coming in close contact with the surface of the projection section and the inner surface of the attachment hole, the attachment hole that is a through hole is filled. As a result of this structure, an attachment hole that is used when a speaker grill is attached to a speaker panel can be arranged at a position where it penetrates to an acoustic space.