Image Stabilization Control Circuit for Lens Alignment
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Solution Overview
Problem
Digital cameras, especially those held by one hand, experience significant camera shake due to vibration, which existing methods struggle to effectively correct, particularly in portable devices where proper handling is challenging.
Innovation Solution
An image stabilization control circuit that organically controls vibration detecting and driver elements, comprising a first equalizer for generating vibration-component signals, a second equalizer for generating drive signals, a verifying-signal input circuit, and a control unit for verifying the operations of these components, ensuring accurate lens positioning to correct optical axis displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration detecting element and driver element are used to correct optical axis displacement, then camera shake correction is achieved, but the system complexity increases and reliability is compromised due to lack of verification mechanisms
Solution Approach 1:
The patent implements feedback mechanisms where the control unit continuously monitors the output signals from the vibration detecting element and position detecting element, compares them with expected values, and adjusts the drive signals accordingly. This closed-loop feedback system ensures reliable optical axis correction while maintaining manageable circuit complexity through systematic signal verification.
Solution Approach 2:
The control unit performs self-verification by checking whether the correction operation achieves the expected effect through comparing position detecting element outputs with vibration-component signals. This self-service mechanism enables the system to monitor its own performance and maintain reliability without requiring external verification systems, thus avoiding excessive complexity.
2Reliability
If verification mechanisms are added to the control circuit, then operational reliability is improved, but the circuit complexity increases
Solution Approach 1:
The patent merges the verification functions with the existing control unit, integrating multiple verification tasks into a single centralized component. The control unit simultaneously manages drive signal generation, position monitoring, vibration signal processing, and operational verification, thereby improving reliability through comprehensive checking while avoiding the complexity of separate verification circuits.
Solution Approach 2:
The control unit is designed as a multi-functional element that performs diverse tasks including generating drive signals, processing vibration-component signals, monitoring position detecting element outputs, and verifying operational correctness. This universal approach allows one component to provide multiple functions, improving reliability without proportionally increasing overall circuit complexity.
3Stability of the object's composition
If the lens position is continuously adjusted to cancel vibration displacement, then optical axis stabilization is achieved, but the position detection precision requirements increase
Solution Approach 1:
The patent applies preliminary action by using the vibration detecting element to predict upcoming optical axis displacement before it occurs. The control unit generates correction signals based on predicted vibration patterns, allowing the lens position to be adjusted proactively rather than reactively. This approach stabilizes the optical axis while reducing the instantaneous precision demands on the position detecting element.
Solution Approach 2:
The system employs dynamic adjustment where the drive signals to the lens are continuously modified based on real-time vibration detection and position feedback. The control unit dynamically balances the vibration-component signals with position detecting element outputs, enabling optical axis stabilization through adaptive control that accommodates varying precision requirements during different phases of vibration.
Data Source
AI summary
A first equalizer generates a vibration-component signal indicating the amount of movement of an image pickup apparatus according to an output signal of a vibration detecting element for detecting the vibration of the image pickup apparatus. The second equalizer generates a drive signal used to control a driver element to correct the position of lens and image pickup devices, based on the output signal of a position detecting element for detecting the position of the lens to be driven or the image pickup devices to be driven and the vibration-component signal. A verifying-signal input circuit inputs a signal used for verification, to the first equalizer. A control unit verifies the operations of the driver element, the position detecting element and the first equalizer.