Side Acoustic Speaker with Oblique Reflection Surface
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Solution Overview
Problem
Slim electronic devices face challenges in maintaining sound characteristics, particularly in the high frequency voice range, due to the orthogonal vibration direction of micro-speakers and sound passage, leading to damping issues.
Innovation Solution
Incorporating a side acoustic emission type speaker device with a sound reflection surface inside the housing, obliquely facing the speaker module, to reflect sounds towards the sound emission hole, enhancing sound output in the high frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a side acoustic emission type speaker device is mounted in a slim electronic device, then the device can be made thinner, but the sound characteristic in the high frequency voice range deteriorates due to damping
Solution Approach 1:
The sound reflection surface is positioned at an oblique angle (45 degrees) relative to the sound passage, changing the dimensional orientation of sound wave propagation. This oblique arrangement allows sound waves to travel along the thickness direction of the housing and exit through the side surface, resolving the contradiction between device thinness and high frequency sound quality by utilizing a different spatial dimension for sound emission
Solution Approach 2:
The sound reflection surface is pre-positioned within the housing to reflect sound waves before they reach the sound passage. This preliminary reflection action ensures that high frequency sound waves are properly directed toward the emission hole, preventing damping issues before they occur and maintaining sound quality in thin device configurations
2Device complexity
If the vibration direction of the micro-speaker is orthogonal to the sound passage extending direction, then the device structure is simplified, but the sound in the high frequency voice range is more damped
Solution Approach 1:
The sound reflection surface acts as an intermediary element between the micro-speaker and the sound passage. It receives sound waves from the speaker in one direction and redirects them toward the emission hole, enabling the orthogonal arrangement to function effectively while maintaining high frequency sound quality. The reflection surface mediates the relationship between the speaker's vibration direction and the sound passage orientation
Solution Approach 2:
By introducing the oblique sound reflection surface, the system changes the propagation dimension of sound waves. The orthogonal arrangement between speaker vibration and sound passage is maintained for structural simplicity, while the reflection surface adds a new dimensional path for sound wave travel, allowing high frequency sounds to reach the emission hole without excessive damping
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
Improves sound quality in the high frequency voice range by effectively directing sound waves, reducing damping and enhancing sound pressure levels, as demonstrated in measured sound characteristics.
Implementation Method 1
a sound reflection surface formed inside the housing and obliquely facing the speaker module. A sound emitted from the speaker module is reflected by the sound reflection surface to the sound emission hole
Data Source
AI summary
Disclosed is an electronic device including: a housing having a sound emission hole formed in at least one side thereof; a speaker module which is at least partially accommodated in the housing; and a sound reflection surface formed inside the housing and obliquely facing the speaker module. A sound emitted from the speaker module can be reflected by the sound reflection surface to the sound emission hole. The side acoustic emission type speaker device and the electronic device including the same can be variously implemented.