Timepiece Resin Gasket for Electrical Stability
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Solution Overview
Problem
The existing timepiece designs face electrical instability and compromised waterproofness due to direct contact between the case main body and the rear lid, which affects the antenna's tuning and receiving sensitivity.
Innovation Solution
A timepiece design featuring a metal case with an annular fitting section, a metal rear lid with a cylindrical section, and a synthetic resin gasket that creates a spacer to prevent direct contact between the case and the lid, ensuring electrical stability and waterproofness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the case main body and rear lid are attached together by fastening screws with direct contact, then the structure is simple and easy to manufacture, but the fastened states vary due to temporal change causing electrical instability and poor antenna performance
Solution Approach 1:
A resin layer is introduced as an intermediary between the case main body and rear lid. This resin layer prevents direct metal-to-metal contact, eliminating electrical instability caused by temporal changes in screw fastening. The resin layer acts as a mediator that maintains consistent electrical properties while still allowing mechanical attachment through screw holes.
Solution Approach 2:
The attachment structure is segmented into distinct functional zones: metal portions for mechanical strength and attachment, resin portions for electrical stability and sealing, and through-holes for fastening. This segmentation allows each material to perform its optimal function without the drawbacks of direct contact between conductive surfaces.
2Object-affected harmful factors
If the case main body and rear lid are attached by screws with direct contact, then the waterproofness is compromised due to contact points, but removing screws increases assembly complexity
Solution Approach 1:
The resin layer serves as a waterproof intermediary that fills the space between the case main body and rear lid. It seals around the screw holes and attachment points, preventing water penetration while allowing the screw fastening mechanism to function. This eliminates the harmful effect of direct contact points on waterproofness.
Solution Approach 2:
The timepiece case utilizes a composite structure combining metal components (case main body, rear lid) with a resin layer. This composite approach leverages the mechanical strength of metal and the sealing properties of resin, achieving both waterproofness and structural integrity without compromising assembly simplicity.
3Manufacturing precision
If direct contact between case main body and rear lid is used, then the manufacturing process is simple, but the antenna tuning and receiving sensitivity are hindered due to electrical instability
Solution Approach 1:
The resin layer is positioned as an intermediary that provides a stable electrical environment for the antenna. By preventing variable contact between metal surfaces, it creates consistent electrical conditions that improve antenna tuning precision and receiving sensitivity, while the manufacturing process remains straightforward with the resin layer being applied as a simple sealing component.
Data Source
AI summary
A timepiece provided with a metal case having a fitting section which is annularly provided in a lower portion of the inner circumferential surface, a metal lid body having a lid main body section which is arranged on a lower end of the case and covers a lower portion of the case and a cylindrical section which is arranged in the fitting section of the case, and a synthetic resin gasket having a gasket main body section which is arranged between the fitting section of the case and the cylindrical section of the lid body and a spacer section which forms a space between a lower end surface of the case and an upper surface of the lid main body section.