Acoustic reflector, speaker unit, and chair
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Solution Overview
Problem
Existing speaker units with semi-elliptical reflection surfaces that form virtual sound sources require larger sizes due to the distance between focal points, making them cumbersome, and existing solutions do not effectively address the need for a compact design while maintaining sound quality.
Innovation Solution
An acoustic reflector with an elliptical reflection surface that reflects sound within a range equal to or less than the nominal directional angle of the speaker device, allowing for a reduced size configuration, and is movable between use and retreat positions, with a transparent material and adjustable support for improved usability and sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semi-ellipsoid shape with elliptical reflection surface is used to form a virtual sound source, then sound quality is improved, but the entire size increases due to the distance between focal points
Solution Approach 1:
The invention extracts only the necessary functional portion of the semi-ellipsoid - specifically the reflection surface area required to reflect sound within the speaker's nominal directional angle. By removing unnecessary portions of the semi-ellipsoid that extend beyond what is needed for effective sound reflection, the size is reduced while maintaining the virtual sound source formation capability and sound quality.
Solution Approach 2:
The invention applies local quality by making the reflection portion's size and shape specifically adapted to the speaker device's characteristics - particularly matching the nominal directional angle. The reflection surface is configured with specific curvature and dimensions in different regions to optimize sound reflection for the given speaker's beam pattern, rather than using a uniform or oversized semi-ellipsoid.
2Measurement precision
If the distance between focal points is increased to improve virtual sound source positioning, then sound positioning accuracy is improved, but the entire size increases
Solution Approach 1:
The invention changes the geometric parameters of the reflection surface - specifically the curvature radius and the position of the reflection surface relative to the speaker. By optimizing these parameters, the focal point distance is reduced to a more compact value while maintaining sufficient sound positioning accuracy through precise control of the reflection geometry and surface characteristics.
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 enables a compact acoustic reflector that maintains sound quality by reflecting sound within specific directional angles, reduces user pressure, and enhances usability through adjustable positioning and movement, ensuring excellent sound input and reduced interference.
Implementation Method 1
sound output from a speaker device that has an output position of the sound at or near one focal point on the elliptical reflection surface is reflected by the elliptical reflection surface
Data Source
AI summary
An acoustic reflector includes a reflection portion on which an elliptical reflection surface is formed, in which sound output from a speaker device that has an output position of the sound at or near one focal point on the elliptical reflection surface is reflected by the elliptical reflection surface, and the reflection portion has a size that reflects sound in a range of equal to or less than a nominal directional angle of the speaker device. As a result, because an outer shape of the reflection portion is formed to have a size in the range corresponding to the nominal directional angle of the speaker device, it is possible to reduce the size of the acoustic reflector.