Image Stabilization Control Circuit with Digital Position Compensation
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Solution Overview
Problem
Conventional image stabilization control circuits in imaging apparatuses face challenges in miniaturization and efficient processing speed, particularly due to the non-proportional output signals from position detectors, which require linear compensation, making it difficult to embed compensation circuits effectively.
Innovation Solution
The image stabilization control circuit incorporates a vibration control equalizer and a position control equalizer, both controlled by an internal CPU, which compensates for the non-linear output signals from position detectors, allowing for precise lens positioning and vibration correction, enabling efficient anti-shake functionality while minimizing circuit area and semiconductor chip costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If linear compensation circuits are added to correct non-proportional position detector outputs, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical/analog linear compensation circuit with a digital signal processing approach. The CPU reads raw position detector outputs, applies linear compensation calculations through software algorithms, and generates corrected position signals. This substitution of digital processing for analog circuitry reduces device complexity while maintaining measurement precision.
Solution Approach 2:
The patent changes the state of position detector outputs from raw non-proportional signals to compensated linear signals through digital parameter transformation. The CPU applies compensation parameters (slope, intercept) to transform the detector output characteristics, enabling accurate position control without adding complex analog compensation circuits.
2Reliability
If multiple devices are provided for detecting lens position and vibration components, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent makes the CPU serve multiple functions: it controls the lens driver, processes vibration detector signals for image stabilization, reads position detector signals, and applies linear compensation. By consolidating these functions into a single processing unit, the system achieves reliable multi-sensor control without increasing manufacturing cost through multiple dedicated processors.
Solution Approach 2:
The patent merges the control of multiple detectors (position detector, vibration detector) and actuators (lens driver) into a single integrated control system centered on the CPU. This consolidation reduces the number of separate control circuits needed, lowering manufacturing costs while maintaining reliable detection and control functions.
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 enhances image stabilization by accurately compensating for non-linear position detector outputs, improving processing speed and precision, and allowing for more efficient miniaturization of the image stabilization control circuit, thereby reducing the influence of vibrations on image quality.
Implementation Method 1
The position detector 102 can be implemented with a Hall device to generate an induced current according to the absolute position of the lens and output a voltage signal.
Implementation Method 2
The lens driver 104 can be implemented with a voice coil motor. The image stabilization control circuit 100 controls the position of a moving coil of the voice coil motor, namely, the position of the lens, by adjusting the voltage value supplied to the lens driver 104.
Implementation Method 3
The vibration detector 106 can be implemented with a gyro sensor. An angular velocity signal is generated according to the vibration that was applied to the imaging apparatus and output to the image stabilization control circuit 100.
Data Source
AI summary
A vibration control equalizer for generating a vibration signal for determining a driving amount for an optical component on the basis of an output signal of a vibration detector for detecting vibration of an imaging apparatus, a position control equalizer for calculating a position signal for determining a driving amount for the optical component on the basis of an output signal of a position detector for detecting position of the optical component, and an internal CPU for controlling the vibration control equalizer and the position control equalizer are provided, and compensation for the output signal of the position detector is performed by the internal CPU.