Mechanical Timepiece Magnetic Field Detection for Accuracy
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Solution Overview
Problem
Mechanical timepieces face accuracy issues due to external magnetic field noise interfering with rotor rotation detection, leading to erroneous speed governing pulses and deviations in time indication.
Innovation Solution
A mechanical timepiece incorporating a spring-driven balance with a permanent magnet and coil, an external magnetic field detection mechanism, a vibration detection mechanism, and a speed governing control mechanism that adjusts processing based on detected magnetic fields to prevent erroneous vibration detection and improve time accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If voltage waveform detection by coil is used for rotor rotation detection, then the detection mechanism is simple, but external magnetic field noise causes erroneous detection and time indication deviation
Solution Approach 1:
The patent introduces a magnetic field detection mechanism as an intermediary between the coil and the speed governing control mechanism. This intermediary detects external magnetic fields and provides information to the control mechanism, which then adjusts its operation accordingly. This resolves the contradiction by adding a layer of protection against magnetic noise without fundamentally changing the simple voltage waveform detection approach.
Solution Approach 2:
The patent implements a feedback loop where the magnetic field detection mechanism continuously monitors external magnetic fields and feeds this information back to the speed governing control mechanism. The control mechanism then adjusts its speed governing pulses based on this feedback, preventing erroneous operation during magnetic disturbances. This feedback approach maintains measurement precision while keeping the overall system relatively simple.
2Measurement precision
If speed governing control is continuously applied to maintain time accuracy, then time indication precision is improved, but external magnetic fields cause erroneous vibration detection and incorrect governing
Solution Approach 1:
The magnetic field detection mechanism serves as an intermediary that filters out erroneous speed governing commands caused by external magnetic fields. It provides real-time information about magnetic interference to the control mechanism, which then decides whether to apply speed governing pulses. This intermediary layer ensures that speed governing is only applied when reliable, resolving the contradiction between continuous control and reliability.
Solution Approach 2:
The patent makes the speed governing control dynamic by adjusting its operation based on real-time magnetic field conditions. When external magnetic fields are detected, the control mechanism modifies or suspends speed governing pulses. This dynamic adaptation allows the system to maintain high time indication accuracy during normal operation while preventing erroneous governing during magnetic disturbances, thus improving both precision and reliability.
3Reliability
If magnetic field detection and conditional speed governing control are implemented, then reliability under magnetic interference is improved, but device complexity increases
Solution Approach 1:
The patent enhances reliability by making the speed governing control mechanism universal - it can operate in both magnetic interference and non-interference conditions. By integrating magnetic field detection capability into the existing control architecture, the system gains the ability to adapt to different environmental conditions without requiring entirely separate control systems. This multi-functionality approach improves reliability while controlling the increase in device complexity.
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
Enhances time accuracy by preventing external magnetic field noise interference and allowing for precise speed governing through electromagnetic force control, extending the duration of accurate timekeeping.
Implementation Method 1
output a current to the coil by the drive pulse to generate an electromagnetic force, and cause the generated electromagnetic force to act on the permanent magnet
Implementation Method 2
the rotation of the rotor is detected by the voltage waveform generated in the coil
Data Source
AI summary
A mechanical timepiece includes a spring, a balance, an oscillation circuit, a speed governing mechanism configured to include a permanent magnet and a coil, one of the permanent magnet and the coil being held by the balance, an external magnetic field detection mechanism configured to detect an external magnetic field, a vibration detection mechanism configured to detect vibration of the balance and output a vibration detection signal, a speed governing control mechanism configured to output a drive pulse to perform processing for governing the balance, a power storage mechanism configured to store electric energy, and a generator configured to generate the electric energy. The speed governing control mechanism changes a processing content of the speed governing of the balance in accordance with a detection result of the external magnetic field.