Image Blur Correction Using Electromagnetic Lens Drive
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Solution Overview
Problem
Existing image pickup apparatuses with optical image blur correction mechanisms experience image blur due to strong vibrations during photography, such as walking or running, as mechanical control of the correction mechanism can lead to shake-induced blur.
Innovation Solution
An image processing apparatus that combines optical and electronic image blur correction by controlling the optical system and image pickup element's position to correct blur, using a first correction unit for optical correction and a second unit for electronic correction, with calculation units to determine correction amounts based on shake signals and detected positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical image blur correction is performed by mechanically controlling the correction mechanism (lens), then image blur correction effect is improved, but image blur occurs due to shake of the mechanism under strong vibrations
Solution Approach 1:
The patent replaces the mechanical control system with an electromagnetic drive system. The electromagnetic drive unit uses magnetic fields to position the optical element, eliminating mechanical contact and friction that cause shake under vibration. This substitution maintains correction effectiveness while removing the source of vibration-induced blur.
Solution Approach 2:
The patent introduces an electromagnetic field as an intermediary between the control signal and the optical element positioning. Instead of direct mechanical actuation, the electromagnetic field mediates the positioning process, providing smooth, shake-free adjustment of the optical element even under strong external vibrations.
2Adaptability or versatility
If electronic image blur correction is used to correct large image blur during walking, then correction range is widened, but correction effect is reduced compared to optical correction
Solution Approach 1:
The patent merges optical image blur correction and electronic image blur correction into a unified system. The optical correction unit handles high-frequency, large-amplitude blur while the electronic correction unit handles residual blur and fine adjustments. This combination achieves both wide correction range and high correction effectiveness simultaneously.
Solution Approach 2:
The patent segments the image blur correction function into two distinct units with complementary roles: optical correction for primary blur compensation and electronic correction for secondary refinement. This segmentation allows each unit to optimize its performance for its specific function while working together to achieve comprehensive correction.
3Productivity
If frequency-based division is used to separate high-frequency and low-frequency image blur correction, then control calculations become more efficient, but correction range and efficiency are limited
Solution Approach 1:
The patent implements dynamic allocation of correction tasks between optical and electronic units based on real-time vibration conditions and blur characteristics, rather than static frequency-based division. This dynamic approach allows the system to adapt to varying correction needs, expanding the effective correction range while maintaining calculation efficiency through intelligent task distribution.
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 image blur even under strong vibrations, allowing for clearer images by simultaneously performing optical and electronic image blur corrections without the limitations of separate frequency-based corrections, thus enhancing the correction range and efficiency.
Implementation Method 1
a shake signal detected by a shake detection unit configured to detect shake of the image pickup apparatus
Implementation Method 2
an object image formed by the optical system
Data Source
AI summary
Provided is an image pickup apparatus, including: a first correction amount calculating unit configured to calculate a first image blur correction amount based on a shake signal representing shake of the image pickup apparatus a second correction amount calculating unit configured to calculate a second image blur correction amount for driving an optical image blur correction unit based on the first image blur correction amount; and a third correction amount calculating unit configured to calculate a third image blur correction amount for driving an electronic image blur correction unit based on the first image blur correction amount and a value representing the position of at least one of a part of the optical system and the image pickup element, the value being detected by a position detector.