Interpenetrating Pickup Coil Windings for Adjustable Resonance
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Solution Overview
Problem
Conventional electromagnetic pickups for stringed instruments have limited adjustability in resonance frequency, which fails to accurately capture the wide range of frequencies produced by guitar strings, particularly the fundamental notes and their overtones.
Innovation Solution
The development of pickup coil sensors with concurrently wound and fully or partially interpenetrating windings allows for adjustable resonance frequencies by varying the number of turns, degree of interpenetration, and connection configurations (series, parallel, or independent) of the windings, enabling broader frequency range adjustment and emphasis on specific frequency regimes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If single-winding coil sensors are used, then the structure is simple and easy to manufacture, but the resonance frequency cannot be adjusted to cover the wide range of guitar string frequencies
Solution Approach 1:
The coil is divided into multiple separate windings (first winding, second winding, third winding) instead of a single continuous winding. Each winding can have different parameters (number of turns, wire gauge) to independently target different frequency ranges, allowing the sensor to cover the broad spectrum of guitar string frequencies from 80Hz to over 20,000Hz
Solution Approach 2:
Different portions of the coil (different windings) are given different local characteristics - specifically different numbers of turns and different wire gauges. For example, the first winding may use 24AWG wire with 500 turns while the second winding uses 36AWG wire with 2000 turns, allowing each section to optimize for specific frequency ranges while maintaining overall structural simplicity
2Adaptability or versatility
If multiple single-winding coils are used with different parameters, then the frequency response can be adjusted, but the number of coils and connections increases complexity
Solution Approach 1:
Multiple windings with different characteristics are merged into a single coil assembly that functions as one integrated sensor element. The windings are positioned concentrically around the same magnetic pole pieces and can be electrically connected in series or parallel, providing frequency adjustment capabilities without requiring multiple separate coil assemblies
Solution Approach 2:
The multi-winding coil structure serves multiple functions simultaneously: it acts as a single sensor element while providing adjustable resonance frequency, maintains a compact single-coil form factor, and offers both series and parallel connection options for different frequency responses, thereby reducing overall device complexity compared to using multiple separate coils
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 approach allows for resonance frequencies to be tailored, enhancing the capture of guitar string frequencies, providing a more accurate and nuanced sound representation compared to traditional single-winding coil sensors.
Implementation Method 1
electromagnetic pickup (also known as an induction coil sensor, induction sensor, search coil sensor, pickup coil sensor, or magnetic loop sensor)
Implementation Method 2
the winding is disposed about one or more ferromagnetic or permanent magnet pole pieces
Data Source
AI summary
Coils for receiving or transmitting electromagnetic signals comprising a plurality of concurrently wound and fully or partially interpenetrating windings for which the resonance frequency can be varied over a broad range. The presently described embodiments provide for electromagnetic pickups for stringed musical instruments; however, it is appreciated that other embodiments providing for a wide variety of devices comprising pickup coil sensors are apparent. It is also apparent that a wide variety of devices are possible in which coils with concurrently wound and interpenetrating windings will serve as transmitting coils.