Image Stabilization Control Circuit Reducing CPU Dependency
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Solution Overview
Problem
Conventional image stabilization control circuits in image pickup apparatuses require complex processing and large circuit areas, making them inefficient and costly, especially when trying to adjust the hand-shake correction mechanism effectively in digital cameras.
Innovation Solution
An image stabilization control circuit that utilizes an analog/digital converter to digitalize signals from vibration and position detecting elements, a high-pass filter, integrator, and centering circuit to generate control signals for lens movement, reducing the need for a CPU and minimizing circuit size, allowing for efficient hand-shake correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional image stabilization control circuits are used with complex processing and CPU, then hand-shake correction function is achieved, but circuit area and power consumption increase
Solution Approach 1:
The patent extracts and removes the CPU and complex digital processing components from the image stabilization control circuit. Instead, it uses a dedicated analog control circuit with operational amplifiers and integrators that directly process sensor signals to generate lens drive signals, significantly reducing circuit area while maintaining hand-shake correction functionality
Solution Approach 2:
The patent replaces the digital/CPU-based control system with an analog control system using operational amplifiers and integrators. This substitution of digital electronics with analog circuitry simplifies the control architecture, reduces circuit complexity, and lowers power consumption while achieving the same image stabilization objective
2Productivity
If conventional image stabilization control circuits with CPU are used, then processing capability is sufficient, but power consumption increases
Solution Approach 1:
The analog control circuit is designed to be self-sufficient, directly converting sensor outputs to lens drive signals through operational amplifiers and integrators without requiring external CPU processing. This self-service architecture eliminates the power-hungry CPU while maintaining adequate signal processing capability for image stabilization
Solution Approach 2:
The patent substitutes the high-power digital CPU system with a low-power analog circuit system. The operational amplifier-based control circuit processes signals continuously with minimal power consumption, replacing the intermittent but high-power CPU operations with efficient analog signal processing
3Device complexity
If simple control circuit is used to reduce circuit area, then circuit area decreases, but control precision for lens movement deteriorates
Solution Approach 1:
The patent introduces integrator circuits as intermediary components between the sensor signals and the lens drive signals. These integrators, implemented with operational amplifiers and capacitors, provide precise control by integrating the error signals over time, ensuring accurate lens positioning without requiring complex digital processing
Solution Approach 2:
The patent uses operational amplifiers with high gain and precision to replace complex digital control algorithms. The analog circuitry provides continuous, high-precision control of the lens position through voltage signals, achieving manufacturing-grade precision with a simple circuit architecture
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
This configuration reduces power consumption and circuit area, enabling more efficient hand-shake correction and image stabilization with reduced costs and complexity, while maintaining high image quality by accurately controlling lens movement based on detected vibrations and positions.
Implementation Method 1
an analog/digital converter circuit for converting output signals of the plurality of vibration detecting elements and the plurality of position detecting elements to digital signals
Implementation Method 2
a high-pass filter, integrator, and centering circuit to generate control signals for lens movement
Implementation Method 3
a high-pass filter, integrator, and centering circuit to generate control signals for lens movement
Data Source
AI summary
An image stabilization control circuit comprises a plurality of vibration detecting elements for detecting vibration of an image pickup apparatus; a plurality of position detecting elements for detecting a position of an optical component; an analog/digital converter circuit for converting output signals of the plurality of vibration detecting elements and the plurality of position detecting elements to digital signals; and a logic circuit for generating a control signal for driving the optical component based on the output signals of the plurality of vibration detecting elements and the plurality of position detecting elements digitalized by the analog/digital converter circuit, wherein the analog/digital converter circuit digitalizes and outputs the output signal of the plurality of vibration detecting elements with respect to a plurality of axis directions, and successively digitalizes and outputs the output signal of the plurality of position detecting elements with respect to a plurality of axis directions.