Thin Speaker Resonance Tuning for Amplitude and Clearance Control
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Solution Overview
Problem
Existing speaker devices struggle to achieve a simple configuration while being thin, as they often require complex designs to manage amplitude and clearance between movable parts.
Innovation Solution
A speaker device with a limiting unit that restricts the signal band to include the peak frequency of the speaker unit's frequency characteristics, combined with a housing that adjusts resonance frequency through a resonant structure, allowing for reduced clearance and a thinner design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the speaker device uses a conventional design to ensure sufficient clearance between movable parts, then reliability is improved, but the device thickness increases
Solution Approach 1:
The patent changes the frequency band parameter by limiting the sound source signal to a specific frequency range that includes the peak frequency. This parameter change allows the speaker unit to achieve sufficient amplitude with reduced mechanical clearance requirements, enabling thinner device design while maintaining reliability
Solution Approach 2:
The patent dynamically adjusts the operating conditions by controlling the frequency characteristics of the input signal. By optimizing the frequency band to match the speaker unit's peak frequency, the system achieves efficient amplitude generation with minimal mechanical clearance, resolving the contradiction between reliability and thickness
2Length of moving object
If the speaker device reduces clearance to make it thinner, then device thickness is improved, but amplitude control becomes difficult
Solution Approach 1:
The patent applies parameter changes by limiting the signal frequency band to match the speaker unit's peak frequency characteristics. This ensures that the speaker unit operates in its most efficient range, achieving sufficient amplitude even with reduced clearance, thus maintaining manufacturing precision while enabling thinner design
Solution Approach 2:
The limiting unit provides feedback control by analyzing the frequency characteristics of the speaker unit and adjusting the input signal band accordingly. This feedback mechanism ensures precise amplitude control despite reduced mechanical clearance, resolving the contradiction between thickness and amplitude control precision
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 speaker device with a simple configuration that can be made thinner without significantly impairing acoustic output, by controlling amplitude and reducing clearance between movable parts.
Implementation Method 1
a housing that houses the speaker unit; and a drive circuit that, based on the sound source signal with the limited signal band, outputs a control signal that causes the diaphragm of the speaker unit to vibrate, wherein: the limiting unit limits the sound source signal to a frequency band that includes a peak frequency of frequency characteristics of an amplitude of the speaker unit in accordance with a shape of the speaker unit and a shape of the housing
Data Source
AI summary
A speaker device includes: a limiting unit that limits a signal band of a sound source signal that has been input; a speaker unit that includes a diaphragm; a housing that houses the speaker unit; and a drive circuit that, based on the sound source signal with the limited signal band, outputs a control signal that causes the diaphragm of the speaker unit to vibrate, wherein: the limiting unit limits the sound source signal to a frequency band including a peak frequency of frequency characteristics of an amplitude of the speaker unit in accordance with a shape of the speaker unit and a shape of the housing.