Bar Antenna Bobbin Restriction Portion for Inductance Stability
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Solution Overview
Problem
Existing bar antennas face issues with reduced inductance due to shortening of the core length, leading to irregular wire winding and reduced number of windings, which affects the performance of the coil.
Innovation Solution
A bobbin design with a core holding portion and a restriction portion that prevents the turned-back conductive wire from moving to the side where the lamination portion is positioned, allowing for secure winding of the conductive wire in a first direction and ensuring the second layer is laminated correctly, even with a short core length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length of the core is reduced to shorten the bar antenna, then the dimension of the bar antenna in longitudinal direction is shortened, but the number of windings of the conductive wire is reduced and the inductance desired for the coil may not be secured
Solution Approach 1:
The patent transitions from single-layer winding to multi-layer (laminated) winding of the conductive wire around the core. By stacking multiple layers of windings, the inductance is increased without requiring a longer core, thus resolving the contradiction between antenna length reduction and inductance maintenance
Solution Approach 2:
The patent uses a composite structure combining the core, multi-layer conductive wire windings, and bobbins to achieve the desired inductance in a compact form. The lamination of multiple wire layers creates a composite winding structure that maximizes inductance within the limited core length
2Reliability
If the conductive wire is laminated to be wound around the core to increase inductance, then the inductance desired for the coil is secured, but the turned-back portion of the conductive wire is pulled to a side where the first bobbin is positioned and irregular shape of winding may occur
Solution Approach 1:
The patent introduces a bobbin as an intermediary component with a restriction portion that prevents the turned-back wire from being pulled to the first bobbin side. This intermediary structure maintains winding regularity while allowing multi-layer lamination to achieve the desired inductance
Solution Approach 2:
The restriction portion of the bobbin creates a balanced winding environment by preventing asymmetric pulling of the turned-back wire, ensuring that both layers of lamination are wound with equal precision and regularity, thus maintaining manufacturing quality
Data Source
AI summary
A bobbin for a bar antenna includes a core holding portion being configured to be mounted with a stick-shaped core, and a restriction portion being connected to the core holding portion, the restriction portion being configured to restrict a turned-back portion of a conductive wire from moving to a side where a lamination portion is positioned, the conductive wire forming the lamination portion by being wound to the core in a first direction in a longitudinal direction of the core, the turned-back portion serving as a portion being turned back in a second direction that is different from the first direction.