Rotation Detection in Electronic Timepieces
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Solution Overview
Problem
Existing electronic timepieces face inefficiencies in power consumption due to continuous and frequent rotation detection of low-frequency rotating switches, leading to high power consumption and poor efficiency.
Innovation Solution
A rotation detecting apparatus with a rotating member and multiple detectors that output detection results, allowing a CPU to combine and extract angle ranges, specify the rotating direction based on changes, and identify relative positions within a predetermined angle range, reducing detection frequency and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotation is detected continuously and frequently to accurately count electric signal inputs, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic detection by setting a predetermined time interval between detection operations. The controller performs rotation detection at regular intervals rather than continuously, which reduces power consumption while still capturing rotation events. The time interval is configured based on the maximum expected rotation speed to ensure accurate counting of electric signal inputs during the detection period.
Solution Approach 2:
The patent dynamically adjusts the detection frequency based on operational conditions. When a rotation event is detected, the system increases detection frequency to accurately count the rotation inputs. During normal operation without rotation events, the detection frequency is reduced to the predetermined lower interval, optimizing power consumption while maintaining detection accuracy when needed.
2Loss of energy
If detection frequency is reduced to lower power consumption, then energy efficiency is improved, but detection accuracy may deteriorate
Solution Approach 1:
The system uses periodic detection with a predetermined time interval that is carefully calibrated to the maximum rotation speed of the rotating member. This ensures that even at reduced frequency, the system captures all rotation events within each interval, maintaining detection accuracy while reducing overall power consumption compared to continuous detection.
Solution Approach 2:
The system incorporates feedback mechanisms where the controller monitors detection results and adjusts subsequent detection intervals accordingly. When rotation events are detected, the system activates more frequent detection to ensure accurate counting. When no rotation is detected, the system returns to the lower frequency periodic detection, optimizing the balance between power efficiency and detection accuracy.
Data Source
AI summary
A rotation detecting apparatus includes a rotating member, detectors regarding a rotating direction of the rotating member, and a predetermined unit. Each detector detects whether a predetermined standard direction is included in detecting ranges different for each rotating member and outputs a result. The predetermined unit combines the detection result output from each detector and extracts an angle range. The predetermined unit specifies the rotating direction of the rotating member based on changes in the angle ranges extracted a plurality of times occurring in the plurality of times. The detecting range corresponding to each of the plurality of detectors is determined to be able to identify relative positions before and after a change from the angle range extracted by the predetermined unit to the angle range that is clockwise or counterclockwise apart a predetermined number or less to the angle range extracted, the predetermined number being two or more.