Analog Timepiece Hand Position Correction via Optical Detection
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Solution Overview
Problem
Analog electronic timepieces often fail to accurately detect and correct the positional shifts of hands due to external factors like magnetic fields and impacts, leading to incorrect hand positions being memorized, especially for date indicators which lack position detection mechanisms, resulting in prolonged unnoticed stoppages.
Innovation Solution
Incorporating a gear train mechanism, a detection unit, and a delay cycle counting unit that allows for rotational adjustment of hands to correct their positions by counting delay cycles and using light detection to verify hand positions, ensuring accurate alignment even after prolonged stoppages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a position detection mechanism is added to the date indicator, then the reliability of position detection is improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent uses the hour hand as an intermediary object to indirectly detect the position of the date indicator. Instead of adding a direct detection mechanism to the date indicator, the system detects the hour hand's position and uses the known gear ratio relationship to infer the date indicator's position, thereby avoiding direct complexity while maintaining detection reliability
Solution Approach 2:
The patent replaces a direct mechanical detection system for the date indicator with an optical detection system that targets the hour hand. The light emitter and light receiver detect the hour hand's position optically, and the control unit calculates the date indicator's position based on the mechanical gear relationship, substituting direct mechanical detection with indirect optical detection combined with computational inference
2Measurement precision
If the hour hand is continuously monitored for position corrections, then the accuracy of timekeeping is improved, but the power consumption increases
Solution Approach 1:
The patent implements periodic position confirmation at specific intervals (e.g., every 12 hours when the hour hand returns to the same position) rather than continuous monitoring. The control unit activates the light emitter and light receiver only at these periodic intervals to detect whether the hour hand has returned to its reference position, thereby maintaining accuracy while significantly reducing power consumption compared to continuous monitoring
Solution Approach 2:
The patent performs preliminary position confirmation by detecting the hour hand's position at predetermined intervals before significant drift can occur. By periodically checking the position and making corrections in advance, the system maintains accuracy without requiring continuous high-power operation
3Ease of operation
If the date indicator rotates in conjunction with the hour hand, then the date display is automatically updated, but the risk of positional drift increases when the hour hand stops
Solution Approach 1:
The patent implements a feedback mechanism where the control unit periodically detects the hour hand's position using the light emitter and light receiver, compares it with the stored reference position, and determines whether the hour hand has returned to the correct position. Based on this feedback, the control unit adjusts the date indicator's position accordingly, ensuring reliability even when the hour hand has been stopped for extended periods
Solution Approach 2:
The patent performs preliminary position confirmation by detecting the hour hand's position at predetermined intervals before significant drift can occur. By periodically checking the position and making corrections in advance, the system maintains accuracy without requiring continuous high-power operation
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
Enables easy correction of hand positions, preventing prolonged incorrect displays and ensuring accurate time and date keeping by efficiently detecting and addressing positional shifts, even in configurations where date indicators lack position detection mechanisms.
Implementation Method 1
a light emitter 521 and a light receiver 522. The position detection unit 51 has a light emitter 521 and a light receiver 522
Data Source
AI summary
An analog electronic timepiece comprising: a plurality of rotating display bodies; a gear train mechanism; a drive control unit; a detection unit; and a delay cycle counting unit, wherein the delay cycle counting unit adds 1 to the number of delay cycles in a case where it is determined, for each detection cycle of a predetermined reference display mode, that the first rotating display body is stopped during a rotation cycle of the first rotating display body based on detection results by the detection unit at a first timing and at a second timing, and the drive control unit rotationally moves the first rotating display body for a number of times, the number corresponding to the number of delay cycles, in a case where the first rotating display body is capable of operating at the first timing.