Operation Button Flange Structure to Prevent Wrong Orientation Assembly
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Solution Overview
Problem
Existing electronic devices face the challenge of preventing operation buttons from being assembled to the housing in a wrong orientation, particularly due to the design of key switches with leg portions that can lead to incorrect assembly.
Innovation Solution
The electronic device incorporates an operation button with a flange and a device case featuring a restricting portion. The restricting portion does not overlap the flange when the button is inserted correctly but overlaps it when inserted incorrectly, preventing incorrect assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If leg portions are provided to protrude at four positions in a vertically and horizontally symmetrical manner, then the keytop can be assembled to the housing, but the keytop may be assembled upside down in a wrong orientation
Solution Approach 1:
The patent applies asymmetry by making the restricting portion asymmetric with respect to the opening. The restricting portion protrudes only from the left side of the opening, creating an asymmetric configuration that prevents the operation button from being assembled in wrong orientations. The flange on the operation button corresponds to this asymmetric restricting portion, allowing insertion only in the correct orientation where the flange aligns with the restricting portion's position.
2Reliability
If a restricting portion is added to prevent wrong orientation assembly, then assembly orientation correctness is improved, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by adding the restricting portion only at the specific location where it is needed - protruding from the left side of the opening. Rather than making the entire housing or opening complex, the restricting portion is a localized feature that provides the orientation control function with minimal additional structure. This localized approach prevents wrong orientation assembly while keeping the overall device structure simple.
Data Source
AI summary
An electronic device includes an operation button having a flange, and a device case formed with an opening into which the operation button is inserted. The device case is provided with a restricting portion that does not overlap the flange when the operation button is inserted into the opening in an orientation, and that overlaps the flange when the operation button is to be inserted into the opening in an orientation other than the orientation.