Synthetic Resin String for Ukulele Timbre
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Solution Overview
Problem
Conventional stringed musical instrument strings for ukuleles and guitars lack sufficient timbre and are often expensive when high-quality timbre is desired.
Innovation Solution
A stringed musical instrument string made from a wire rod with a synthetic resin, such as polyvinylidene fluoride-based or polyamide-based resin, wound in a coil shape with specific dimensions and number of turns, which can be manufactured using a simple method involving twisting and gamma-ray irradiation to achieve a timbre similar to natural gut strings at a lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional synthetic resin strings are used, then cost is reduced, but timbre quality deteriorates
Solution Approach 1:
The patent applies composite materials by combining synthetic resin with a metal wire core. The metal core provides structural stability and acoustic properties similar to natural gut strings, while the synthetic resin coating maintains low cost and durability. This composite structure resolves the contradiction between cost-effectiveness and timbre quality.
Solution Approach 2:
The patent changes physical parameters of the string construction, specifically the diameter ratios between the metal core and overall string (0.3-1.2mm outer diameter with appropriate core proportions), and the coil winding parameters (130-520 turns per meter). These parameter optimizations enable synthetic resin strings to achieve timbre characteristics close to natural gut strings while maintaining low manufacturing cost.
2Manufacturing precision
If natural gut strings are used, then timbre quality is improved, but cost increases
Solution Approach 1:
The patent replaces expensive natural gut strings with affordable synthetic resin strings that can be mass-produced. While natural gut strings provide good timbre, they are costly and have limited durability. The synthetic alternative offers comparable timbre through optimized construction parameters while being economically viable and more durable, effectively substituting an expensive material with a cheaper, long-lasting alternative.
3Stability of the object's composition
If coil winding density is increased, then string stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the coil winding parameters within specific ranges: 130-520 turns per meter with a winding diameter of 0.8-4.0 mm. These parameter specifications achieve string stability without excessive manufacturing complexity. The defined ranges balance the need for stability with practical manufacturability, avoiding both under-winding (insufficient stability) and over-winding (excessive 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
The stringed musical instrument string reproduces an excellent timbre close to natural gut strings while maintaining stability and accuracy, with no negative aspects even at low tension, offering high volume and immediate string stability, and accurate pitch, all at a lower cost.
Implementation Method 1
the wire rod having a shape wound in a coil shape is irradiated with a γ ray
Data Source
AI summary
A stringed musical instrument string 1 of the present invention has a configuration in which a wire rod W including a synthetic resin as a constituent material is wound in a coil shape at a normal time, and is stretched over a target stringed musical instrument in a state of being unwound from the coil shape when used. With such a configuration, the stringed musical instrument string 1 can reproduce an excellent timbre close to the timbre of a natural gut string at low cost by the wire rod W including a synthetic resin as a constituent material and has various characteristics (for example, no negative aspect even when the tension is weak, high volume, stable string even immediately after stretched, and accurate pitch) as the stringed musical instrument string 1.