Hybrid Shutter Motor Control for Curtain Travel Curve Correction
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Solution Overview
Problem
In hybrid power shutters combining an electromagnetic motor and an assist spring, torque variations due to aging, environment, or manufacturing variations lead to inconsistent curtain travel curves, necessitating effective torque correction and control.
Innovation Solution
An imaging apparatus with a motor mechanism, a spring mechanism, and a control unit that adjusts the time length of electric conduction and current supply to the coil to control the traveling torque of the shutter blade, utilizing a counter for deterioration correction and sensors for speed and temperature feedback to optimize the shutter operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an electromagnetic motor and an assist spring are combined to drive the shutter blade, then the traveling speed and force are improved, but the curtain travel curve becomes inconsistent due to torque variations from aging, environment, or manufacturing variations
Solution Approach 1:
The control unit measures the actual curtain travel curve and compares it with a reference curve, then adjusts the electric conduction timing and current values based on the deviation detected, creating a closed-loop feedback system that compensates for torque variations
Solution Approach 2:
The system dynamically changes electrical parameters (conduction start time, conduction duration, current amplitude) to the coil based on detected deviations, allowing the electromagnetic motor's output torque to be adjusted and match the reference curtain travel curve despite spring force variations
2Force
If torque adjustment methods for electromagnetic motors are used, then motor torque control is improved, but variations in spring force amount cannot be sufficiently corrected
Solution Approach 1:
The system detects the actual curtain travel curve and uses this feedback to determine necessary corrections, then adjusts electrical parameters to compensate for both motor and spring variations
Solution Approach 2:
The control unit acts as an intermediary that translates spring force variations into corresponding electrical parameter adjustments, effectively decoupling the spring's aging characteristics from the final curtain travel performance
3Manufacturing precision
If the control unit adjusts electric conduction timing and current values to correct traveling operation, then curtain travel control precision is improved, but the system complexity increases
Solution Approach 1:
The control unit performs multiple functions: it controls the electromagnetic motor, measures the curtain travel curve, compares it with reference data, calculates corrections, and adjusts parameters - consolidating all control functions into a single multi-functional component
Solution Approach 2:
The system adjusts only two key electrical parameters (conduction timing and current values) to achieve precise control, minimizing the number of adjustable parameters while maintaining high control precision
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 precise control of curtain travel, adjusting torque at different stages to maintain consistent shutter operation and adapt to varying conditions, ensuring accurate image capture.
Implementation Method 1
a motor mechanism configured to generate a traveling torque of an opening and closing blade of a mechanical shutter provided in an incident light path to an imaging element by electric conduction to a coil
Data Source
AI summary
To enable correction or adjustment of a curtain travel curve in a case of driving an opening and closing blade by a power source in which a motor mechanism and a spring mechanism are combined. Provided are the motor mechanism that generates a traveling torque of the opening and closing blade of a mechanical shutter provided in an incident light path to an imaging element by electric conduction to a coil, and the spring mechanism that generates the traveling torque of the opening and closing blade together with the motor mechanism. In this case, a control unit capable of individually controlling a time length from the start of the electric conduction to the coil to the start of traveling of the opening and closing blade, and a value of a current to be supplied to the coil is provided.