Flexible Loudspeaker Structure with Rear Passive Radiator Isolation
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Solution Overview
Problem
Conventional wireless loudspeakers suffer from sound vibration transmission to the stand, causing chattering sounds that deteriorate sound quality.
Innovation Solution
The loudspeaker apparatus is designed with a passive radiator positioned on the rear surface of the housing, outputting sound through an inclined surface that increases in distance from the output port towards the outer side, and is not in contact with the stand, along with a sound absorbing material to minimize vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the passive radiator is positioned on the bottom surface of the apparatus, then the sound output is enhanced, but sound vibration is transmitted to the stand causing chattering sounds that deteriorate sound quality
Solution Approach 1:
The patent extracts the passive radiator from the bottom surface position and relocates it to the rear surface side of the loudspeaker within the housing. This separation removes the source of vibration transmission to the stand while preserving the sound output function. The passive radiator is specifically positioned on the rear surface side opposite to the loudspeaker, creating spatial separation between the vibration source and the stand contact point.
Solution Approach 2:
The patent introduces a sound absorbing material as an intermediary between the passive radiator and the housing rear surface. This intermediary layer absorbs sound vibrations and prevents them from being transmitted to the housing and subsequently to the stand, thereby eliminating the chattering sound while maintaining the passive radiator's sound output function.
2Object-generated harmful factors
If the passive radiator is relocated to the rear surface side, then vibration transmission to the stand is reduced, but the sound output direction and coverage may be affected
Solution Approach 1:
The patent segments the sound output function by having both the loudspeaker and passive radiator contribute to omnidirectional sound emission. The loudspeaker handles the primary sound output while the passive radiator provides additional bass reinforcement, and together they achieve omnidirectional coverage through strategic positioning within the housing.
Solution Approach 2:
The patent combines the sound output functions of the loudspeaker and passive radiator to achieve omnidirectional sound emission. By positioning both components within the housing and utilizing their complementary acoustic characteristics, the system merges their outputs to create comprehensive 360-degree sound coverage while the passive radiator remains isolated from the stand.
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
This configuration effectively suppresses sound quality deterioration by reducing chattering sounds, allowing for high-performance sound output without increasing the device's size.
Implementation Method 1
a passive radiator provided on a rear surface side of the loudspeaker in the housing, an output port of the passive radiator being opposed to an inclined surface which is provided at an upper portion of the second unit
Implementation Method 2
along with a sound absorbing material to minimize vibration transmission
Data Source
AI summary
A high-performance and flexible loudspeaker apparatus usable in various scenes. A first unit includes a loudspeaker therein, a second unit is connected to a lower portion of the first unit, the first unit comprises the loudspeaker provided in a housing of the first unit so as to output a sound toward an upper portion of the housing and a passive radiator provided on a rear surface side of the loudspeaker in the housing, and an output port of the passive radiator is opposed to an inclined surface which is provided at an upper portion of the second unit and whose distance from the output port of the passive radiator increases toward a radially outer side of the housing.