Lens Unit Position Detection for Image Blur Correction
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Solution Overview
Problem
Existing image blur correction apparatuses face challenges in maintaining accurate position detection of lens units during yaw and pitch movements, as these movements interfere with each other's detection accuracy, leading to deterioration in position detection precision.
Innovation Solution
The apparatus includes a lens unit that can turn about two orthogonal axes, supported by a fixed member with pairs of thrust generation units and detection units positioned symmetrically around these axes, allowing independent detection and correction in both directions without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If position detection is performed using a single position detection portion and detection target portion for both yaw and pitch directions, then the device structure is simplified, but the position detection accuracy deteriorates when the lens unit is turned in either direction
Solution Approach 1:
The detection system is segmented into two independent detection units: a first position detection portion for detecting yaw direction position and a second position detection portion for detecting pitch direction position. This segmentation allows each detection unit to independently detect position in its specific direction without interference from the other direction, resolving the contradiction between simplified structure and accurate detection.
2Productivity
If the lens unit is turned in yaw direction to correct image blur, then the blur correction function is achieved, but the position detection accuracy in pitch direction deteriorates due to relative position change between detection portions
Solution Approach 1:
The detection system is divided into separate yaw detection and pitch detection units. The first position detection portion detects only yaw direction position while the second position detection portion detects only pitch direction position. This segmentation ensures that yaw movement for blur correction does not affect pitch direction detection accuracy, as each detection unit independently measures its designated direction.
Solution Approach 2:
The position detection portions are positioned asymmetrically relative to the support axes, with the first position detection portion arranged to detect yaw direction and the second position detection portion arranged to detect pitch direction. This asymmetric arrangement allows each detection unit to focus on its specific detection direction without being affected by movements in the other direction.
3Productivity
If the lens unit is turned in pitch direction to correct image blur, then the blur correction function is achieved, but the position detection accuracy in yaw direction deteriorates due to relative position change between detection portions
Solution Approach 1:
The detection system is divided into separate yaw detection and pitch detection units. The second position detection portion detects only pitch direction position while the first position detection portion detects only yaw direction position. This segmentation ensures that pitch movement for blur correction does not affect yaw direction detection accuracy, as each detection unit independently measures its designated direction.
4Adaptability or versatility
If thrust generation portions are positioned to enable turning in both directions, then the blur correction functionality is achieved, but the position detection accuracy in one direction is affected by turning in the other direction
Solution Approach 1:
The system uses separate thrust generation portions for yaw direction and pitch direction, along with separate detection units for each direction. The first thrust generation portion generates thrust for yaw direction turning while the second thrust generation portion generates thrust for pitch direction turning. This segmentation enables independent control and detection in each direction, preventing cross-directional interference while maintaining bidirectional blur correction capability.
Data Source
AI summary
Provided is an image blur correction apparatus including a lens unit including at least one lens, and being turnable in a first direction and a second direction, a fixed member turnably supporting the lens unit in the first direction and the second direction, a first drive unit including a pair of first thrust generation units that applies thrust and is positioned on opposite sides sandwiching one of the first supporting and second supporting axe, a second drive unit including a pair of second thrust generation units that applies thrust and is positioned on opposite sides sandwiching another of the first and second supporting axe, a pair of first detection units being positioned on opposite sides sandwiching one of the first and second supporting axe, and a pair of second detection units being positioned on opposite sides sandwiching another of the first and second supporting axe.