Double-Bars Violin Resonance Box for Balanced Treble and Bass Timbre
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Solution Overview
Problem
The existing resonance boxes of violin family instruments fail to achieve good resonance timbre simultaneously in treble, alto, and bass registers due to the limitations of traditional bass bars and sound posts, resulting in inadequate brightness in the treble register and lack of sonority and mellowness in the bass register.
Innovation Solution
A double-bars design is implemented in the resonance box, featuring two upper and two lower long-strip bars on the inner walls of the front and back plates, with cross grooves forming sound tunnels, and a thickness gradient structure to enhance vibration and resonance, eliminating the need for a sound post.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional bass bar and sound post design is used, then the resonance box structure is simple and easy to manufacture, but the timbre in treble and bass registers is not good enough
Solution Approach 1:
The patent divides the traditional single bass bar into two separate bars (first bass bar and second bass bar) positioned at different locations under the bridge. This segmentation allows each bar to independently enhance specific frequency ranges, with the first bass bar optimizing bass register and the second bass bar optimizing treble register, thereby resolving the contradiction between structural simplicity and timbre quality.
Solution Approach 2:
The patent introduces a spatial dimension by positioning the two bass bars at different locations under the bridge rather than using a single centralized bar. This dimensional arrangement creates distinct vibration pathways and resonance chambers, enabling simultaneous optimization of both bass and treble timbres while maintaining manufacturing feasibility.
2Ease of manufacture
If traditional bass bar and sound post design is used, then the structure is conventional and easy to produce, but the broadband vibration from treble to bass register is not achieved
Solution Approach 1:
By segmenting the bass bar into two separate bars positioned at different locations, the patent creates multiple independent vibration sources that can simultaneously support both treble and bass registers. This segmentation enables broadband vibration across the entire frequency range while maintaining conventional manufacturing processes.
Solution Approach 2:
The dual bass bar configuration provides multi-functionality by simultaneously serving as support structures for both treble and bass registers, as well as acting as vibration transmission pathways across the entire frequency spectrum. This universal design achieves broadband vibration capability without requiring complex specialized manufacturing.
3Strength
If sound post is added to support top and back plates, then mechanical support is improved, but acoustic resonance between treble and bass registers is not enhanced
Solution Approach 1:
The patent replaces the single sound post with two separate bass bars positioned at different locations under the bridge. This segmentation allows each bar to independently provide mechanical support while simultaneously creating distinct acoustic resonance pathways, thereby enhancing both mechanical strength and acoustic resonance between registers.
Solution Approach 2:
The two bass bars act as intermediary elements that simultaneously provide mechanical support for the top and back plates while serving as acoustic mediators to enhance resonance between treble and bass registers. Their dual function resolves the contradiction between mechanical support and acoustic resonance enhancement.
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 design significantly improves the timbre and sound quality of both treble and bass registers by increasing the number of resonance areas and enhancing vibration transmission, resulting in a more vibrant and sonorous sound output.
Implementation Method 1
the first groove spans two upper bars in the width direction of the resonance box, and forms an upper transverse sound tunnel on the inner wall of the front plate, while the second groove forms an upper longitudinal sound tunnel on the inner wall of the front plate
Implementation Method 2
The design significantly improves the timbre and sound quality of both treble and bass registers by increasing the number of resonance areas and enhancing vibration transmission
Implementation Method 3
A double-bars design is implemented in the resonance box, featuring two upper and two lower long-strip bars on the inner walls of the front and back plates, with cross grooves forming sound tunnels, and a thickness gradient structure to enhance vibration and resonance
Data Source
AI summary
A double-bar violin family without sound post, including a resonance box, with a front plate, back plate and sidewalls, wherein: two upper bars are parallel on the front plate inner wall; two lower bars are parallel on the back plate inner wall; an upper cross groove sits on the front plate inner wall, and forms an upper cross sound tunnel on the front plate inner wall; a lower cross groove sits on the back plate inner wall, and the lower cross groove forms a lower cross sound tunnel on the back plate inner wall. This breaks the shackles of the traditional bass bar and sound post design in resonance box, eliminates sound post in resonance box, and proposes a new improved design, wherein treble register is not bright, and bass register is not sonorous and mellow enough, so the resonance box produces treble, alto, and bass registers with good timbre.