Stepping Motor Control Unit for Watch Pointer Actuation
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Solution Overview
Problem
Existing electronic time pieces face challenges in reducing the size of the unit while maintaining effective control over the pointer driving motor, leading to complex control mechanisms and potential inaccuracies when the main control portion is external to the unit.
Innovation Solution
A pointer driving motor unit with a supporting body, stepping motor, input portions for instruction signals, and a control portion that outputs driving signals based on signal comparisons and stored correspondence tables, allowing for simplified control of the pointer's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main control portion is mounted inside the unit, then the unit can be completed as a functional time piece, but the size of the unit increases and reduces modularity
Solution Approach 1:
The system is divided into separate functional modules: the main control portion (microcomputer) is separated from the pointer driving motor unit. The motor unit contains only the stepping motor and pointer mechanism, while the main control portion resides elsewhere in the electronic timepiece. This segmentation reduces the volume of the motor unit while maintaining functional completeness through modular architecture.
2Volume of moving object
If the main control portion is taken out to the outside of the unit, then the unit size is reduced, but the control from the main control portion becomes complicated and unit control accuracy deteriorates
Solution Approach 1:
A driver circuit is introduced as an intermediary component between the main control portion and the stepping motor. The driver circuit receives control signals from the main control portion and generates appropriate driving signals for the stepping motor, simplifying the control interface and ensuring accurate unit control while maintaining the reduced unit size.
3Volume of moving object
If the main control portion is taken out to the outside of the unit, then the unit size is reduced, but control accuracy and appropriateness deteriorate
Solution Approach 1:
The driver circuit acts as a precision intermediary that ensures accurate signal transmission and motor control. It properly interfaces the control signals from the main control portion with the specific requirements of the stepping motor, maintaining control accuracy and appropriate response even though the main control portion is external to the motor unit.
Data Source
AI summary
An object is to provide a pointer driving motor unit which can easily control driving of a pointer of a time piece by a stepping motor, a multifunctional electronic device, and a control method of a pointer driving motor unit. A pointer driving motor unit includes: a supporting body; a stepping motor which rotates a pointer that is supported to be rotatable with respect to the supporting body; a plurality of input portions which include a first input portion into which a first instruction signal is input from a main control portion, and a second input portion into which a second instruction signal is input from the main control portion; and a control portion which is provided in the supporting body, outputs a first driving signal that drives the pointer by a first operation to the stepping motor based on a result of comparing the first instruction signal and a predetermined threshold value with each other, and outputs a second driving signal that drives the pointer by a second operation to the stepping motor based on a result of comparing the second instruction signal and a predetermined threshold value with each other.