String Instrument Pickup Bobbin Reinforcement Against Plate Warping
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Solution Overview
Problem
In pickups for string instruments, the ends of the plates in the longitudinal direction are prone to warping outward due to the pressing force of the coil, which can lead to incorrect positioning of the pickup on the string instrument.
Innovation Solution
A pickup design that includes a bobbin with two plates, a plurality of magnets, and reinforcement parts. The reinforcement parts connect the plates together and are positioned further outward than the edge portions of the end magnets, which face the coil, to suppress warping of the plate ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the coil is tightly wound between the pair of plates and pressed against the plates, then the coil is securely positioned, but the two ends of the plates in the longitudinal direction are prone to warping outward
Solution Approach 1:
The bobbin is divided into a pair of separate plates that are spaced apart, with the coil wound between them. This segmentation allows the coil to be independently positioned and secured between the plates without causing the entire bobbin structure to warp, as the force is distributed across two separate plate components rather than a single monolithic structure.
Solution Approach 2:
The patent combines multiple functional elements into an integrated assembly: the two plates are connected by connecting parts to form a unified bobbin structure, while the coil is merged between the plates and magnets. This combining approach secures the coil in position through the integrated structure, preventing plate warping by distributing mechanical stresses across the combined assembly of plates, connecting parts, and magnets.
2Reliability
If the two ends of magnets in the width direction of the plates face the coil, then the magnetic field coverage is optimized, but the ends of the plates are prone to warping outward due to pressing force
Solution Approach 1:
The patent applies local quality by positioning magnets at specific locations on the plates with their width-direction ends facing the coil to optimize magnetic field coverage in those local areas. Simultaneously, the connecting parts are strategically positioned to provide localized reinforcement at the plate ends, preventing warping only where the pressing force is applied, rather than requiring uniform reinforcement across the entire plate structure.
Solution Approach 2:
The connecting parts serve as intermediary elements between the two plates, mediating the mechanical stress caused by the coil pressing against the plates. These connecting parts transfer and distribute the pressing force, preventing it from concentrating at the plate ends and causing warping, while allowing the magnets to maintain their optimal positioning for magnetic field coverage.
3Ease of manufacture
If the plates have a cantilevered structure at the ends, then the bobbin is easy to manufacture, but the two ends of the plates are prone to warping outward under pressing force
Solution Approach 1:
The patent applies preliminary action by pre-positioning the connecting parts to connect the two plates before the coil is wound and pressed against the plates. This preliminary connection establishes structural support at the plate ends in advance, preventing warping from occurring when the coil is subsequently installed and pressed against the plates, while maintaining the simple cantilevered structure for ease of manufacture.
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 reinforcement parts effectively restrict the plate ends from moving away from each other, preventing warping and ensuring precise positioning of the pickup on the string instrument, while maintaining small changes in the positional relationship between the magnets and the coil.
Implementation Method 1
the coil are wound around the plurality of magnets between the two plates... configured to output an electrical signal corresponding to vibrations of the string
Data Source
AI summary
A pickup includes a bobbin and a coil. The bobbin includes two plates, a plurality of magnets, and reinforcement parts. The two plates are spaced apart from each other in a plate thickness direction, and each of the two plates extends in a first direction perpendicular to the plate thickness direction. The magnets are attached to the two plates. Each of the magnets extends in the plate thickness direction between the two plates. The reinforcement parts connect the two plates together. The coil are wound around the plurality of magnets between the two plates. Each of the magnets includes two edge portions each of which faces the coil along the second direction. The magnets include end magnets located at both ends in the first direction. The reinforcement parts are positioned further outward along the first direction than the two edge portions of each of the end magnets.