Digital Filter Servo Circuit for Image Stabilization
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Solution Overview
Problem
Conventional image stabilization control circuits require frequent replacement of external electrical parts to adjust filter coefficients, making it difficult to easily change control characteristics and reducing work efficiency.
Innovation Solution
The image stabilization control circuit includes a digital filter circuit and a register, allowing for easy adjustment of filter coefficients without replacing external parts, and uses a digital filter to perform filter processing based on coefficients stored in the register.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an analog filter circuit is used in the servo circuit, then the circuit can perform filter processing, but the filter coefficient cannot be changed without replacing external electrical parts
Solution Approach 1:
The patent replaces the analog filter circuit with a digital filter circuit that uses a microprocessor to perform filter processing. This substitution allows the filter coefficient to be changed through software programming rather than requiring physical replacement of external electrical parts, thereby improving adaptability while maintaining ease of manufacture.
Solution Approach 2:
The patent implements parameter changes by allowing the filter coefficient to be modified through software programming in the microprocessor. This enables flexible adjustment of the filter coefficient without changing the physical hardware, resolving the contradiction between adaptability and ease of manufacture.
2Adaptability or versatility
If external electrical parts are used for filter processing, then the circuit can adjust filter coefficients, but frequent replacement of parts reduces work efficiency
Solution Approach 1:
The patent replaces the mechanical/analog approach of using external electrical parts with a digital system using a microprocessor. This allows filter coefficients to be adjusted through software without physical part replacement, eliminating the time loss associated with frequent part replacement and thereby improving work efficiency.
Solution Approach 2:
The patent uses software programming to create a virtual copy of the filter processing function that can be repeatedly adjusted without physical replacement. This digital copy allows frequent adjustments of filter coefficients without the time cost of replacing actual electrical parts, improving productivity.
3Difficulty of detecting and measuring
If a CPU is used for digital filter processing, then the circuit can perform complex processing, but the chip area and power consumption increase
Solution Approach 1:
The patent uses a dedicated microprocessor unit specifically for digital filter processing rather than a full CPU. This partial approach provides sufficient processing capability for the filter function while minimizing unnecessary power consumption and chip area that would be required for a complete CPU implementation.
Data Source
AI summary
An image stabilization control circuit controls an optical element driving element configured to move an optical element provided in an imaging apparatus based on an output signal of a vibration detection element provided in the imaging apparatus. The image stabilization control circuit includes an analog-digital conversion circuit configured to receive an analog signal from a position detection element that detects the position of the optical element and convert the input analog signal into a digital signal, and a servo circuit configured to generate a correction signal for correcting the position of the optical element based on an output signal of the analog-digital conversion circuit and output the generated correction signal to the optical element driving element. The servo circuit includes a digital filter circuit and a register. The digital filter circuit performs filter processing based on a filter coefficient stored in the register.