Shake Correction Drive Signal Timing Adjustment
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Solution Overview
Problem
Conventional shake correction mechanisms in image capture apparatuses experience noise in pixel signals due to the magnetic field generated by voice coils used for electromagnetic driving, particularly when pulse drive signals are applied, leading to potential image blurring.
Innovation Solution
The shake correction control device adjusts the ON and OFF timing of drive signals used for shake correction to avoid overlapping with the A/D conversion processing periods of pixel signals, ensuring that the drive signals do not coincide with the reset or pixel signal conversion periods, thereby minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulse drive signals are applied to the voice coil for shake correction, then the shake correction effectiveness is improved, but noise occurs in the pixel signals during A/D conversion
Solution Approach 1:
The control device adjusts the timing of pulse drive signals to be applied before or after the A/D conversion period, rather than during it. By preliminarily determining the A/D conversion start timing and setting the pulse drive signal timing accordingly, the harmful magnetic field effects are avoided during the sensitive conversion period while maintaining shake correction effectiveness
Solution Approach 2:
The system dynamically adjusts the timing of pulse drive signals based on the actual A/D conversion timing, which varies depending on the number of horizontal lines processed. The control device flexibly changes the drive signal timing to always avoid overlapping with the conversion period, adapting to different operating conditions
2Productivity
If the A/D conversion processing is performed collectively on multiple horizontal lines, then the processing efficiency is improved, but the period during which noise can occur is extended
Solution Approach 1:
The invention extracts and isolates the pulse drive signal timing from the A/D conversion timing, separating these two operations in time. By taking out the drive signal application period from the conversion period, the system can process multiple lines efficiently while avoiding noise contamination during the extended conversion window
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 approach effectively reduces noise in pixel signals during shake correction, maintaining image quality by synchronizing drive signal timings with horizontal synchronizing signals and adjusting based on the number of horizontal lines processed, regardless of the drive mode.
Implementation Method 1
the movable stage is driven by an electromagnetic interaction between the voice coil disposed on the movable stage and the permanent magnet disposed on the stationary stage
Data Source
AI summary
A shake correction control device includes circuitry to control an ON/OFF timing of horizontal synchronizing signals of an image capture element, and an ON/OFF timing of one or more drive signals used for correcting a shake of the image capture element, shift at least one of the ON/OFF timing of the drive signals used for correcting the shake of the image capture element so as to be out of a period of time during which analog/digital (A/D) conversion processing is collectively performed on pixel signals for one or more horizontal lines of the image capture element, and adjust the at least one of the ON/OFF timing of the drive signals used for correcting the shake of the image capture element with respect to the horizontal synchronizing signals based on the number of the one or more horizontal lines of the pixel signals collectively subjected to the A/D conversion processing.