Rotary Electronic Component Sealing Structure
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Solution Overview
Problem
Existing drip-proof structures for electronic components face issues with operability and size due to the use of rubbery sheets or separate waterproof cases, which can compromise effectiveness and increase component complexity.
Innovation Solution
A drip-proof structure featuring a rotary body with a shaft, supported by a bearing and housed within two cases, utilizing sliding pieces and circuit boards for output, and ring-shaped drip-proof members arranged between cases and a cover to prevent liquid ingress without obstructing operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubbery drip-proof sheet is installed to seal the gap between the opening and the rotary body, then drip-proofness is improved, but operability of the operating portion deteriorates
Solution Approach 1:
The patent extracts the drip-proof function from the operating portion area by positioning the drip-proof sheet only in the gap between the case and cover, separating the sealing function from the rotary body contact area, thereby maintaining both drip-proofness and operability
Solution Approach 2:
The patent introduces a case structure as an intermediary element between the rotary body and the external environment, placing the drip-proof sheet at the case-cover interface rather than directly at the rotary body opening, thus protecting against liquid ingress without interfering with rotary operation
2Reliability
If a separate waterproof case is provided to cover the electrical function portion, then drip-proofness is improved, but the number of components increases and the size of the rotary electronic component increases
Solution Approach 1:
The patent merges the case structure to serve dual functions: housing the rotary body and providing drip-proof protection through integrated drip-proof sheets, eliminating the need for separate waterproof cases and reducing overall component count
Solution Approach 2:
The case is designed as a multi-functional component that simultaneously provides mechanical housing, structural support, and drip-proof protection through integrated sealing members, reducing the total number of components needed
Data Source
AI summary
A drip-proof structure of an electronic component includes a rotary body that includes a main body as an operating portion, a first case rotatably supporting the rotary body, a second case that supports the other side surface of the main body of the rotary body and houses, together with the first case, the rotary body, a sliding piece that changes its position to follow rotation of the rotary body, a circuit board that outputs an output signal corresponding to the rotational position of the rotary body, a cover that covers the first and second cases and the circuit board, and first and second drip-proof members arranged between the first case and the cover and between the second case and the cover, respectively.