Magnetism Sensor Timepiece Spring Rods Using Non-Magnetic Materials
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Solution Overview
Problem
Magnetism sensors in timepieces are affected by magnetic fields from materials like stainless steel spring rods and bands, leading to inaccurate orientation measurements.
Innovation Solution
Using titanium-based materials for spring rods and non-magnetic cobalt-nickel alloy springs to minimize magnetization, along with non-metal bands and cover members to prevent direct contact and reduce magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring rods are made of stainless steel (SUS material), then structural strength and elasticity are ensured, but magnetization occurs affecting magnetism sensor accuracy
Solution Approach 1:
The patent changes the material parameter of spring rods from stainless steel to titanium-based material. This parameter change maintains the necessary mechanical properties (strength and elasticity) while fundamentally altering the magnetic properties to be non-magnetic, thereby resolving the contradiction between structural reliability and measurement precision.
2Measurement precision
If spring rods are made of non-magnetic material (titanium), then magnetism sensor accuracy is improved, but weight reduction is achieved as a secondary benefit
Solution Approach 1:
The patent applies material substitution by changing from stainless steel to titanium-based material. This parameter change primarily solves the measurement precision issue by eliminating magnetization, while simultaneously achieving weight reduction as an additional benefit, thus resolving the technical contradiction.
3Ease of manufacture
If timepiece band and connecting parts are made of magnetic material, then manufacturing cost and ease of manufacture are reduced, but magnetism sensor operation is affected
Solution Approach 1:
The patent changes the material parameter of the timepiece band and connecting parts from magnetic materials to non-magnetic materials. This parameter change ensures the reliable operation of the magnetism sensor by preventing magnetization, while still allowing for practical manufacturing solutions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures accurate orientation detection by avoiding magnetization effects, reducing weight, and lowering production costs while enhancing wearability and exterior appearance.
Implementation Method 1
the spring rods, which link the band to the bows of the case of the timepiece, are each formed of the pipe and the pin, which are each made of titanium... a situation in which the spring rods are magnetized and affects the magnetism sensor can be avoided
Implementation Method 2
the spring, which is made of a non-magnetic material that has elasticity and is unlikely to be magnetized, such as a cobalt-nickel alloy
Implementation Method 3
the spring, which is made of a non-magnetic material that has elasticity and is unlikely to be magnetized
Data Source
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AI summary
A magnetism sensor equipped timepiece includes a case including a built-in magnetism sensor, a band for the timepiece, and spring rods that attach the band to bows of the case. The spring rods are each formed of a pipe, a pin, and a spring. The pipes and the pins are each made of a non-magnetic material, and the springs are made of a non-magnetic material having elasticity.