Actuator Drive Current Gain Control for Constant OIS Resolution
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Solution Overview
Problem
Existing actuator systems in electronic devices with camera modules experience varying resolution due to different current ranges for lens movement, leading to performance degradation.
Innovation Solution
A system that includes an actuator driving circuit, current sensing unit, gain adjustment unit, and driver to maintain constant resolution by adjusting driving currents based on the maximum current ranges of both the operating and reference actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different actuators are used for lens movement, then the actuator can be selected based on availability or cost, but the resolution of the OIS varies and system performance decreases
Solution Approach 1:
The patent changes the electrical parameters (current range, gain) of the actuator driving circuit to match different actuator types. By detecting the actuator type and adjusting the driving current parameters accordingly, the system maintains consistent resolution across different actuator models while preserving compatibility with various actuators.
2Length of moving object
If the driving current range is increased to improve lens movement capability, then the actuator can cover larger displacement ranges, but the resolution decreases due to larger current steps
Solution Approach 1:
The patent dynamically adjusts the driving current parameters based on the detected actuator type. The driving circuit switches between different current ranges and gain values depending on which actuator is installed, allowing the system to optimize both movement range and resolution for each specific actuator rather than using fixed parameters.
Solution Approach 2:
The system changes electrical parameters (current range, gain) based on actuator type detection. By selecting appropriate parameter sets for different actuators, the patent achieves both adequate movement range and high resolution simultaneously, resolving the trade-off between displacement capability and 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
Ensures consistent resolution and prevents performance degradation by adapting driving currents to match the maximum current ranges, making the system compatible with various actuators.
Implementation Method 1
a current sensing unit configured to sense a current of the operating actuator and generate a sensing signal
Implementation Method 2
an actuator driving circuit configured to generate a driving current for an operating actuator and output the generated driving current to the operating actuator
Data Source
AI summary
A system for driving an actuator which is capable of providing constant resolution regardless of a type of an actuator according to an aspect of the present invention includes an actuator driving circuit configured to generate a driving current for an operating actuator and output the generated driving current to the operating actuator, a current sensing unit configured to sense a current of the operating actuator and generate a sensing signal, and a gain adjustment unit configured to calculate a gain on the basis of a first maximum driving current range of the operating actuator and a second maximum driving current range of a reference actuator and change the sensing signal on the basis of the gain. A signal generated based on the second sensing signal is input to the actuator driving circuit.