Vehicle Door Handle Tact Switch Direct Board Mounting
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Solution Overview
Problem
Existing handle devices for vehicle doors require complex assembly steps, increased size due to lead routing, and design restrictions due to the need for soldering and space for leads connecting tact switches to printed wiring.
Innovation Solution
A handle device with a tact switch fixed to one face of the board, electrically connected via a flange portion and switch cover, using a hold-down member made of synthetic resin with engagement claws and a U-shaped groove to simplify assembly and reduce size, and prevent excessive pressing loads and potting material ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lead is used to connect the tact switch to the printed wiring on the board, then the electrical connection is established, but the number of assembly steps increases and the assembly operation becomes complicated
Solution Approach 1:
The patent extracts and eliminates the lead from the assembly by directly mounting the tact switch onto the board surface. The tact switch is positioned and electrically connected through its terminal portions that contact the printed wiring directly, removing the intermediate lead component and simplifying the assembly process while maintaining reliable electrical connection.
Solution Approach 2:
The patent merges the electrical connection function with the mounting function by designing the tact switch to be directly mounted on the board. The terminal portions of the tact switch serve dual purposes: mechanical attachment to the board and electrical contact with the printed wiring, combining what were previously separate functions performed by different components.
2Reliability
If space is allocated for routing the lead within the housing recess, then the lead can be connected, but the operating handle increases in size
Solution Approach 1:
The patent removes the lead from the system entirely, eliminating the need for lead routing space within the housing recess. The tact switch is directly mounted on the board surface with its terminal portions making direct contact with the printed wiring, thereby removing the spatial requirement for lead accommodation and reducing the overall operating handle size.
3Device complexity
If the tact switch is mounted on the board with printed wiring on the same face, then assembly is simplified, but the printed wiring may cause asperities on the board surface
Solution Approach 1:
The patent applies local quality by positioning the printed wiring and tact switch in specific locations on the board. The printed wiring is arranged on the board surface in a manner that avoids creating asperities, and the tact switch is mounted in a location where its terminal portions can contact the printed wiring without interfering with the overall surface smoothness. This localized arrangement maintains both assembly simplicity and surface quality.
Data Source
AI summary
A handle device for a vehicle door is provided in which a tact switch that can switch between switching modes in response to a pressing-in operation of an operating button is housed and fixed within a housing recess of a handle main body so as to be electrically connected to printed wiring of a board. The printed wiring is disposed at a different site from one face, facing a cover member side, of the board, the tact switch which is fixed to the one face of the board is electrically connected to the printed wiring, a flange portion abutting against the one face of the board is provided integrally with a switch cover covering the tact switch and connected to the operating button, and the push-in stroke of the operating button is restricted to a predetermined value or below with a hold-down member engaged with the handle main body.