Multi-Hand Watch Lock Pulses for Tactile Position Stability
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Solution Overview
Problem
Existing watch mechanisms face issues with positional deviation of hands due to insufficient braking force when touched, leading to power consumption inefficiencies.
Innovation Solution
A watch design incorporating multiple two-coil motors, a control unit, and sensors to detect cover opening or capacitance changes, allowing for a tactile read mode that applies a braking force only when needed, reducing power consumption and preventing positional deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a braking force is applied to the hand to prevent positional deviation, then the positional accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies braking force periodically only when tactile reading is detected rather than continuously. The control unit switches to tactile read mode upon detecting cover opening or capacitance change, applies braking force during this mode, and stops when tactile reading ends, thereby reducing power consumption while maintaining hand position accuracy when needed
Solution Approach 2:
The system uses the user's tactile interaction itself (cover opening or capacitance change) as the trigger to activate braking force. The braking mechanism serves itself by automatically activating when tactile reading is detected and deactivating when it ends, without requiring separate control signals
2Stability of the object's composition
If the braking force is increased to prevent hand movement during tactile reading, then the hand position stability is improved, but the power consumption increases
Solution Approach 1:
The braking force is made dynamic by switching it on and off based on tactile reading detection. The control unit dynamically adjusts the braking state - applying braking force when tactile reading is detected (cover opened or capacitance changed) and releasing it when tactile reading ends, optimizing both stability and power consumption
Solution Approach 2:
The braking force is applied periodically only during tactile reading periods rather than continuously. The system detects tactile reading start (cover opening or capacitance change) and end, applying braking force only during these periods to maintain hand stability while minimizing power consumption
3Measurement precision
If the braking force is applied continuously to maintain hand position, then the positional deviation is prevented, but the power consumption increases
Solution Approach 1:
The patent implements periodic braking by detecting tactile reading events (cover opening or capacitance change) and applying braking force only during these detected periods. This eliminates continuous power consumption while maintaining hand position accuracy when tactile reading occurs
Solution Approach 2:
The patent extracts the braking function from continuous operation and activates it only when necessary - specifically when tactile reading is detected through cover opening or capacitance change. This selective extraction of the braking function reduces unnecessary power consumption while maintaining hand position accuracy during tactile interactions
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
The design effectively prevents hand positional deviation while minimizing power usage by selectively applying a braking force during tactile interaction, enhancing accuracy and efficiency.
Implementation Method 1
each of the motors is a two-coil motor including a first coil and a second coil, and the lock pulse excites only the first coil
Implementation Method 2
the control unit stops an output of the lock pulse after an electromotive force generated in the second coil due to rotation of a rotor of the motor is no longer detected during the output of the lock pulse
Implementation Method 3
a capacitance detection unit configured to detect a capacitance of the dial, and the control unit shifts the operation mode to the tactile read mode based on a change in the capacitance detected by the capacitance detection unit
Data Source
AI summary
An object of the invention is to prevent a positional deviation of a hand while reducing power consumption. A watch includes: a plurality of hands; a plurality of motors configured to drive or brake the plurality of hands, respectively; a pulse generation unit configured to supply, to the plurality of motors, a drive pulse for driving the hands and a lock pulse for braking the hands; and a control unit configured to control an operation mode including a normal hand movement mode and a tactile read mode, and the pulse generation unit supplies the lock pulse to the motors when the control unit shifts the operation mode to the tactile read mode.