Miniature Loudspeaker with Adjustable Sound Guide Channel
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Solution Overview
Problem
Conventional miniature loudspeakers are designed for full frequency range and fail to amplify specific frequency bands, limiting their performance in small electronic devices.
Innovation Solution
A miniature loudspeaker design featuring a housing with a magnetic circuit system, a vibration system with a diaphragm and voice coil, and a ring-shaped damper that forms a variable sound guide channel through tuning holes, allowing direct-current bias adjustment to enhance frequency response by altering the sound guide channel length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the loudspeaker is designed for full frequency range, then it can cover all frequencies, but it cannot amplify the frequency response of a specific frequency band
Solution Approach 1:
The patent applies the dynamics principle by making the sound guide channel length adjustable through a movable piston. The piston can be positioned at different locations within the resonant cavity, dynamically changing the effective length of the sound guide channel. This allows the loudspeaker to amplify different frequency bands by adjusting the piston position, transforming a static structure into a dynamic one that can adapt to different frequency amplification needs without requiring multiple fixed structures.
2Volume of moving object
If the loudspeaker size is reduced for small electronic products, then it fits in compact devices, but the frequency response amplification capability is limited
Solution Approach 1:
The patent uses the dynamics principle to create an adjustable sound guide channel with a movable piston. This allows a compact loudspeaker to achieve variable frequency response amplification by changing the piston position, maximizing the frequency amplification capability within a limited volume space.
Solution Approach 2:
The patent applies parameter changes by varying the length of the sound guide channel through piston movement. By changing this geometric parameter, the resonant frequency and amplification characteristics of the loudspeaker are adjusted, enabling frequency response amplification in a compact design without requiring a larger physical structure.
3Ease of operation
If the sound guide channel length is fixed, then the structure is simple, but different direct currents cannot correspond to different lengths of the sound guide channel
Solution Approach 1:
The patent implements dynamics by introducing a movable piston that can be positioned at different locations to change the sound guide channel length. This dynamic structure allows the system to adapt to different direct current conditions by adjusting the channel length, providing ease of operation for frequency response optimization without excessive structural complexity.
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 design amplifies the frequency response of a specific frequency band while maintaining a compact size, achieving maximum volume output by optimizing the resonant cavity and sound guide channel configuration.
Implementation Method 1
The moving coil loudspeaker transmits an electrical signal to the voice coil in the magnetic gap generated by the magnetic circuit system, which makes the voice coil move under the ampere force and promotes the diaphragm vibration, thus promoting the sound production in the air.
Implementation Method 2
A resonant cavity is formed between the magnetic circuit system and the housing... The first tuning hole, the third tuning hole, and the second tuning hole cooperate to form a sound guiding channel... amplifies the frequency response of a specific frequency band
Data Source
AI summary
A miniature loudspeaker comprises a housing, a magnetic circuit system arranged in the accommodating space of the housing and provided with a first tuning hole, a vibration system arranged at the opening of the housing and including a voice coil and a diaphragm which provided with a second tuning hole, a damper provided with a third tuning hole, and a control circuit. Two ends of the damper are respectively connected with the magnetic circuit system and the diaphragm. A resonant cavity is formed between the magnetic circuit system and the housing. The first tuning hole, the third tuning hole and the second tuning hole cooperate to form a sound guide channel connecting the outside and the resonant cavity. The control circuit inputs direct-current bias current to the voice coil to adjusts initial position of the diaphragm, and the damper lengthens or shortens with the change of the initial position.