Dynamic Braking Rotor for Electronic Timepiece Impact Stability
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Solution Overview
Problem
Electronic watches with ultrasonic motors face issues where external impacts cause positional shifts in display sections like dates, requiring high driving forces for smooth rotation and preventing impacts, which complicates the design.
Innovation Solution
An information display device with a braking member that applies a load to the rotor when stopped and reduces the load during rotation, using a piezoelectric element and vibrating plate to intermittently release the load, allowing smooth rotation without high driving forces and preventing positional shifts due to impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a load is always given by an energizing member such as a spring to the display rotor plate to prevent positional shift, then the display rotor plate is prevented from shifting position due to impact, but a large driving force is required and the display rotor plate cannot be smoothly rotated
Solution Approach 1:
The braking member is designed to dynamically adjust the load on the display rotor plate based on its rotational state. When the rotor is stationary, the braking member applies a holding force to prevent positional shifts from impact. When the rotor needs to rotate, the braking member reduces or releases the load, enabling smooth rotation without requiring excessively large driving forces. This dynamic adjustment resolves the contradiction between maintaining positional stability and enabling smooth rotation.
Solution Approach 2:
The braking member changes the parameter of load application based on the operational state of the display rotor plate. By modifying the magnitude of the applied load according to whether the rotor is stationary or rotating, the system achieves both reliable positional stability during stationary states and smooth rotation during operational states, eliminating the need for continuously large driving forces.
2Reliability
If a braking member always applies load to prevent positional shift, then impact resistance is improved, but power consumption increases due to continuous load application
Solution Approach 1:
The braking member operates through periodic action, applying load only when necessary (when the rotor is stationary and impact resistance is needed) and releasing load when the rotor is rotating. This intermittent operation maintains impact resistance during stationary states while avoiding continuous energy consumption, thus resolving the contradiction between reliability and power consumption.
Solution Approach 2:
The braking member is designed to automatically adjust its load application based on the rotational state of the display rotor plate without requiring external control. The system self-regulates by detecting whether the rotor is stationary or rotating and accordingly applying or releasing the braking load, thereby maintaining impact resistance only when needed and reducing unnecessary power consumption.
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 solution enables the display sections to be smoothly switched and maintained without large driving forces, preventing positional shifts even with external impacts, while reducing power consumption and operational complexity.
Implementation Method 1
a braking member which gives a load to the rotor when rotation of the rotor is stopped, and reduces the load on the rotor when the rotor is rotating
Implementation Method 2
a braking member which gives a load to the rotor when rotation of the rotor is stopped, and reduces the load on the rotor when the rotor is rotating
Data Source
AI summary
An information display device of the present invention includes an hour plate having an opening, a rotor which is rotatably placed below the hour plate and has a display section which is partially exposed corresponding to the opening of the hour plate, and a braking member which gives a load to the rotor when the rotation of the rotor is stopped, and reduces the load on the rotor when the rotor is rotating.