Flute Headjoint Tuning Plug with Concave Surface and Open Crown
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Solution Overview
Problem
Conventional flute headjoints with cork tuning plugs result in muffled sound, particularly affecting low-pitch notes, requiring constant pitch compensation, and limiting sound emission to forward and right-hand directions.
Innovation Solution
A flute headjoint with a three-dimensional concave tuning plug and an open crown, featuring a bimetallic or multi-material configuration with a balance weight, allowing for improved sound amplification and emission in all directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cork tuning plug is used in the flute headjoint, then the structure is simple and traditional, but the sound quality becomes muffled and acoustically passive
Solution Approach 1:
The patent removes the cork material from the tuning plug, extracting the harmful acoustic element while retaining the functional structure. The tuning plug is redesigned without cork, eliminating the sound-absorbing property that causes muffling, while maintaining the basic plug structure for simplicity.
Solution Approach 2:
The patent introduces a composite structure combining metal tuning plug with a metal insert containing air cavities. This composite design replaces the traditional cork material with a metallic composite structure that provides both structural integrity and improved acoustic properties by allowing sound transmission while maintaining manufacturing simplicity.
2Ease of manufacture
If a flat tuning face is applied inside the flute headjoint, then the manufacturing is simple, but the pitch stability deteriorates requiring constant compensation
Solution Approach 1:
The patent replaces the flat tuning face with a three-dimensional concave tuning surface. This curved geometry focuses and directs the air stream more effectively, improving pitch stability and tone quality. The concave shape is manufactured into the tuning plug face, maintaining relative simplicity while dramatically improving acoustic performance.
3Ease of manufacture
If the crown is closed off, then the structure is simple and traditional, but the sound emission directionality is limited to forward and right-hand directions
Solution Approach 1:
The patent divides the crown into two separate functional parts: a closed crown portion that maintains structural integrity and a separate open tuning plug that allows sound emission in multiple directions. This segmentation enables the crown to serve dual purposes - structural closure and acoustic openness - improving sound directionality while maintaining manufacturing simplicity.
4Stability of the object's composition
If cork material is used for the tuning plug, then the traditional construction is maintained, but the left-hand side of the headjoint becomes acoustically passive
Solution Approach 1:
The patent extracts the cork material from the tuning plug construction, removing the element that causes acoustic passivity. The tuning plug is redesigned using metal or other acoustically transparent materials, eliminating the sound-absorbing property of cork while maintaining the traditional tuning plug structure and function.
Solution Approach 2:
The patent introduces a metal insert with air cavities that creates a porous-like structure within the solid metal tuning plug. This internal cavity structure allows sound waves to pass through and resonate, transforming the tuning plug from an acoustically blocking element to an acoustically active component that enhances sound emission in the left-hand direction.
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 provides a consistently full, dynamic, and flexible sound with reduced pitch compensation needs, enabling easier playability of low and high notes, and allowing for quick sound quality adjustments during performance.
Implementation Method 1
a three-dimensional, concave tuning surface instead of a flat surface an improved, clearer sound can be achieved
Implementation Method 2
improved sound amplification and emission in all directions
Implementation Method 3
With an open crown the flute also emits sound in the left-hand direction
Implementation Method 4
a bimetallic or multi-material configuration with a balance weight, allowing for improved sound amplification
Data Source
Figure 1.a
Figure 2~3
Figure 4~6
AI summary
The invention relates to a flute headjoint comprising a cylindrical pipe section (2), an embouchure hole (3) bounded by a reinforcing element (4), a crown (6) adapted to terminate the pipe section (2) situated to the left of the embouchure hole (3), and a concave tuning plug (8) disposed in the pipe section (2) in a sonic chamber (5) situated under the embouchure hole (3). The flute headjoint according to the invention is characterised in that the cylindrical pipe section (2) is longer compared to conventional configurations, the crown (6) is configured to be open, the tuning plug (8, 12, 15, 23) being a cylindrical body with its face situated facing the embouchure hole (3) having a sunken three-dimensional configuration made as a combination of regular or irregular arcuate and flat faces, and has a balance weight (40) adapted to be placed in the resonator cavity (5a) between the tuning plug (8, 12, 15, 23) and the crown (6), and also has an additional extension piece (42, 43).