Vibration Correction Circuit Using Dummy Signal Verification
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Solution Overview
Problem
Conventional image pickup apparatuses face challenges in effectively correcting camera shake, particularly in handheld devices, as existing vibration correction methods require complex control systems and often necessitate mechanical shakers for operation verification, increasing costs and complexity.
Innovation Solution
A vibration correction control circuit that includes an equalizer and a verifying-signal input circuit, which generates drive signals to move the image pickup unit based on detected vibrations and simulates vibration components to verify the operation of structural components without a mechanical shaker, using a driver element like a voice coil motor and vibration detecting elements like gyro sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mechanical shaker is used for operation verification, then verification accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a signal processing approach to create a virtual copy of the mechanical shaker's function. The verifying-signal input circuit generates artificial vibration signals that simulate the effects of a mechanical shaker, allowing verification without the physical device. This copying approach maintains verification accuracy while eliminating the need for complex mechanical verification equipment.
Solution Approach 2:
The patent replaces the mechanical shaker system with an electronic signal generation system. Instead of using physical mechanical vibrations to verify the vibration correction control circuit, the system uses electronic verifying-signal input circuit to generate and input artificial vibration signals, substituting the mechanical verification process with an electronic one that is simpler and more cost-effective.
2Reliability
If vibration correction control circuit is added, then camera shake correction is improved, but device complexity increases
Solution Approach 1:
The vibration correction control circuit is designed to serve multiple functions: it corrects camera shake during normal operation and simultaneously performs self-verification through the verifying-signal input circuit. This multi-functionality reduces the need for separate verification systems, thereby limiting the increase in device complexity while maintaining improved camera shake correction capability.
Solution Approach 2:
The vibration correction control circuit performs self-verification by inputting artificial vibration signals through the verifying-signal input circuit and measuring its own response. This self-service approach allows the circuit to verify its own operation without requiring external verification equipment, thereby improving reliability while minimizing the addition of complex external systems.
3Measurement precision
If position detecting element is added, then lens position control accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The vibration correction control circuit uses feedback from the vibration detecting element to control the driver element's movement. By continuously monitoring vibration effects and adjusting the image pickup unit's position accordingly, the system achieves accurate lens position control without requiring additional position detecting elements, thus improving control accuracy while avoiding increased system complexity.
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 solution simplifies the vibration correction process, reduces verification costs by simulating vibrations, and ensures the image pickup unit maintains stable attitude and position, enhancing operational efficiency and reducing mechanical shaker dependency.
Implementation Method 1
a vibration detecting element for detecting the vibration applied to the camera
Implementation Method 2
a driver element for adjusting the position of the image pickup unit
Data Source
AI summary
In a vibration correction control circuit mounted on an image pickup apparatus including an image pickup unit, provided with lenses, image pickup devices and vibration detecting element, and a driver element for adjusting the position of the image pickup unit, the equalizer generates a drive signal used to move the image pickup unit in a direction along which to reduce the vibration applied to the image pickup unit, based on the output signal of the vibration detecting element. A verifying-signal input circuit supplies a dummy vibration-component signal to the equalizer.