Laminated Carbon Fiber Pointer for Wristwatch Weight Reduction
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Solution Overview
Problem
Existing pointers for timepieces, such as wristwatches, face challenges in reducing weight while ensuring sufficient strength, as they are typically made from a single carbon fiber sheet coated with synthetic resin, which compromises their structural integrity.
Innovation Solution
A pointer body formed by laminating multiple fiber sheets with carbon fibers arranged in varying directions, combined with a coating film for protection, to enhance strength and reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a pointer body is formed by coating the front and back surfaces of a carbon fiber sheet with a coating film made of synthetic resin, then the weight of the whole pointer can be reduced, but the strength of the pointer body cannot be sufficiently ensured
Solution Approach 1:
The patent uses a composite structure consisting of multiple carbon fiber sheets laminated together with their fiber directions varied, forming a reinforced pointer body. This composite material approach allows the pointer to achieve both reduced weight and sufficient strength by combining lightweight carbon fiber with optimized structural arrangement.
Solution Approach 2:
The pointer body is segmented into multiple carbon fiber sheets with different fiber orientation directions. By dividing the single sheet into multiple layers with varied fiber arrangements, the structure achieves enhanced strength and resistance to deformations while maintaining low weight.
2Ease of manufacture
If a pointer body is formed by coating the front and back surfaces of a carbon fiber sheet with a coating film made of synthetic resin, then the manufacturing process is simple, but the resistance to deformations like warpage and twist cannot be sufficiently ensured
Solution Approach 1:
The patent employs a composite material system where multiple carbon fiber sheets with varied fiber directions are laminated to form the pointer body. This composite structure inherently provides resistance to warpage and twist deformations while maintaining manufacturing feasibility through established lamination processes.
Solution Approach 2:
Different regions of the pointer body are constructed with carbon fiber sheets having different fiber orientation directions tailored to local structural requirements. This local optimization enhances resistance to specific deformations like warpage and twist in critical areas while maintaining overall manufacturing efficiency.
Data Source
AI summary
A pointer including a pointer body made of a material sheet formed by a plurality of fiber sheets having carbon fibers arranged in one direction being laminated together with arrangement directions of the carbon fibers being varied.