Shake Correction Lens Group and Imaging Element Movement Control
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Solution Overview
Problem
Existing imaging devices experience a decrease in image quality due to shake correction, particularly because off-axis image points do not remain stationary during hand movement, leading to increased movement and aberrations at the image edges.
Innovation Solution
A shake correction control method and imaging device that employs a first shake corrector to move a lens group perpendicularly to the optical axis and a second shake corrector to move the imaging element, with specific movement ratios adjusted based on the image aspect ratio to minimize image point movement and maintain image quality, satisfying conditions such as 1 < f tan ω / Y.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shake correction is performed by moving the lens group and imaging element, then hand movement correction is achieved, but image quality decreases due to off-axis image point movement
Solution Approach 1:
The patent applies different movement amounts to different parts of the image plane. The center image point is kept stationary while off-axis image points are moved by amounts proportional to their distance from the center. This local differentiation allows shake correction without causing uniform image quality degradation across the entire image plane.
Solution Approach 2:
The patent changes the movement parameter of the lens group and imaging element based on the position of image points. By adjusting the movement amount according to the distance from the optical axis, the system optimizes the balance between shake correction effectiveness and image quality maintenance.
2Measurement precision
If the shake correction lens group moves by a large amount, then rotational shake correction is improved, but off-axis image point movement increases causing quality loss
Solution Approach 1:
The patent implements position-dependent movement where the shake correction lens group moves by amounts tailored to specific image point locations. Center points experience minimal or no movement while off-axis points receive appropriate correction proportional to their distance from the center, preventing uniform quality degradation.
Solution Approach 2:
The patent applies partial correction action by moving the lens group and imaging element by controlled amounts rather than full correction. This partial action is sufficient to correct rotational shake while limiting the excessive movement that would cause off-axis image point degradation.
Data Source
AI summary
A shake correction method for a camera satisfies 1<f tan ω/Y and includes, when recording an image: driving, by a first shake corrector, a shake correction lens group so that a movement amount thereof with respect to a rotational shake around an axis passing through the optical axis and parallel to a short side of the image is larger than that with respect to a rotational shake around an axis passing through the optical axis and parallel to a long side of the image; and driving, by a second shake corrector, an imaging element so that a movement amount thereof with respect to the rotational shake around the axis passing through the optical axis and parallel to the short side of the image is smaller than that with respect to the rotational shake around the axis passing through the optical axis and parallel to the long side of the image.