Antenna Coil Terminal Board Latch Mechanism for Vibration Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna coil devices for vehicle rear window defogging systems face challenges in easy assembly and reliable retention of terminal boards, while also experiencing stray capacitance issues that affect signal quality.
Innovation Solution
The antenna coil device features a latch portion with a split-shaped engagement portion and a latch protrusion in the base member's insertion groove, along with tapered and notch designs on the terminal boards to facilitate easy assembly and prevent dislodgment, while reducing stray capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a resin member is used to hold the terminal boards and coil in an integrated condition, then the device achieves vibration resistance and structural integration, but the assembly process becomes complex and reliable retention of terminal boards is difficult to ensure
Solution Approach 1:
The terminal board is divided into a body portion and a latch portion that can be inserted into the base member. This segmentation allows the terminal board to be assembled in a simple push-in manner while the latch portion provides automatic retention, resolving the contradiction between simple assembly and reliable retention without requiring complex resin integration.
Solution Approach 2:
The latch portion automatically engages with the base member through a latch mechanism that provides self-retention. When the terminal board is inserted, the latch portion automatically locks into place, providing self-service retention without requiring additional fastening operations or complex resin bonding structures.
2Ease of operation
If the terminal board is made with a simple insertion structure, then assembly becomes easy, but reliable retention after assembly is compromised
Solution Approach 1:
The terminal board is segmented into a body portion for insertion and a latch portion for retention. This allows the main body to be simply inserted while the latch portion provides automatic locking, achieving both easy assembly and reliable retention simultaneously.
Solution Approach 2:
The latch portion is designed to be flexible and deformable, allowing it to be compressed during insertion and then spring back to engage with the base member. This dynamic behavior enables simple insertion motion while automatically achieving reliable retention through elastic deformation and engagement.
3Area of stationary object
If the terminal boards are positioned close together, then the device size is reduced, but stray capacitance between terminal boards increases affecting signal quality
Solution Approach 1:
The latch portion is extracted as a separate functional element from the main terminal board body. This allows the terminal boards to be positioned optimally for minimizing stray capacitance while the latch portion provides the retention function, resolving the contradiction between compact size and signal quality by separating structural and electrical functions.
Data Source
Figure 1A~1C
Figure 2
Figure 3~4
AI summary
In an antenna coil device 100, a coil portion 12 having a lead wire 2 wound around a magnetic core 1 is mounted on a case 3 made of plastic resin, and on one side of the case 3, terminal boards 4 and 5 that electrically connect one end and the other end of the lead wire 2 of the coil portion 12 to an external device are placed in a protruding manner. A latch recess 4D is formed in an inserting end portion 4C of the terminal board 4 to form a tip portion into split shape sites 4E and 4F. A tapered portion 7 is formed on the outside of the split shape sites 4E and 4F, and an end portion of the tapered portion 7 joins an engagement portion 8 that is formed in a protruding manner in the lateral direction of the inserting end portion 4C.