Dual-Stage Image Blur Correction with Lens Rotation and Shift
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Solution Overview
Problem
Existing image blur correction systems in cameras face challenges with heavy lens units having large inertia, making it difficult to correct minute blurring, and large movement of correction lenses can deteriorate optical performance, leading to poor image quality.
Innovation Solution
An image blur correction apparatus comprising a lens unit with an imaging optical system, a blur detection unit, a first correction unit for turning the lens in orthogonal directions, a second correction unit for correcting captured images, and an image blur correction control unit that drives these units based on detected blurring, allowing for improved correction by combining gimbal and lens-shift stabilization mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the lens unit is heavy to provide sufficient correction force, then the correction power is improved, but the inertia becomes large making it difficult to correct minute image blurring
Solution Approach 1:
The patent divides the correction function into two independent parts: a first correction unit that turns the lens unit in yaw and pitch directions for large-angle correction, and a second correction unit that moves a correction lens for fine correction. This segmentation allows each unit to be optimized for its specific function, with the correction lens being lightweight for minute adjustments without requiring heavy mass for inertia-based correction force.
2Adaptability or versatility
If the movement amount of the correction lens is large to correct large image blurring, then the correction range is improved, but the optical performance deteriorates causing poor image quality
Solution Approach 1:
The correction system is segmented into two stages: the first correction unit handles large-angle corrections by turning the lens unit, while the second correction unit handles fine adjustments by moving the correction lens within a small range. This ensures that the correction lens operates within its optimal movement range to maintain optical performance, while the overall correction range is extended by the combined action of both units.
Solution Approach 2:
The first correction unit acts as an intermediary that reduces large blurring angles before the second correction unit applies fine correction. By pre-correcting large angles through lens unit rotation, the correction lens only needs to make small adjustments, maintaining optical performance while achieving comprehensive correction range.
3Device complexity
If a single correction mechanism is used to simplify the device structure, then the device complexity is reduced, but the correction performance for both large and minute blurring cannot be simultaneously achieved
Solution Approach 1:
The correction system is divided into two specialized units: the first correction unit for large-angle correction through lens unit rotation, and the second correction unit for fine correction through correction lens movement. Each unit is independently controlled based on blur detection, allowing the system to achieve comprehensive correction performance while maintaining manageable complexity through clear functional separation.
Data Source
AI summary
Provided is an image blur correction apparatus including a lens unit having an imaging optical system and an imaging unit configured to generate an image signal of a captured image, a blur detection unit configured to detect blurring occurring in the lens unit, a first correction unit configured to perform image blur correction by turning the lens unit in a first direction and in a second direction, a second correction unit configured to perform image blur correction on a captured image obtained by the imaging optical system, and an image blur correction control unit configured to drive the first correction unit and the second correction unit based on blurring detected by the blur detection unit.