Camera Vibration Compensation Lens Centering Control
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Solution Overview
Problem
Existing camera systems with vibration compensation functions face issues such as delayed start times due to centering the compensation lens before photography, which increases release time lag, and struggle to balance optical performance with vibration compensation effectiveness.
Innovation Solution
A camera system with a vibration compensation device that uses a compensation lens driven in orthogonal directions within a lens barrel, employing both software and hardware control methods to adjust the compensation lens position based on detected vibrations, allowing for real-time compensation and optimized optical performance during photography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compensation lens is centered before photography, then optical performance is improved and vibration compensation range is extended, but release time lag increases
Solution Approach 1:
The patent implements dynamic control of the compensation lens by switching between two operational modes: a preview mode where the lens is centered to optimize optical performance, and a photography mode where the lens maintains its current position to eliminate release time lag. This dynamic switching allows the system to adapt to different operational requirements, achieving both optimal optical performance and rapid response when needed.
2Reliability
If the compensation lens is shifted to compensate for vibration, then vibration compensation effectiveness is improved, but the lens may reach its movement range limit and lose compensation capability
Solution Approach 1:
The patent applies preliminary action by centering the compensation lens during the preview phase before photography. This preparatory positioning ensures that the lens starts from a neutral position, maximizing its available movement range in both directions during the actual photography moment. By performing this centering action in advance, the system prevents the lens from reaching its movement limits and maintains vibration compensation effectiveness throughout the shooting process.
3Reliability
If the compensation lens is centered during photography operation, then optical performance is maintained, but the release time lag cannot be shortened
Solution Approach 1:
The patent implements periodic action by alternating between two distinct operational phases: a preview phase where the compensation lens is centered to optimize optical performance, and a photography phase where the lens position is frozen to enable rapid shooting. This periodic switching between centering and shooting modes allows the system to achieve both optimal optical performance and high photography speed by matching the lens control strategy to the current operational phase.
Data Source
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AI summary
This camera system includes: a vibration compensation unit that comprises at least one of a vibration compensation optical system that makes an optical axis variable, and an image-capturing unit that can be shifted, and that compensates image vibration upon an image surface occurring due to vibration of a camera; a drive unit that drives the vibration compensation unit; a detection unit that detects vibration of the camera; a position detection unit that detects the position of the vibration compensation unit; a target position determination unit that determines a target position for the vibration compensation unit according to the vibration of the camera detected by the detection unit; a calculation unit that calculates a drive amount for the drive unit based upon the target position and the position detected by the position detection unit; a range of movement limitation unit that limits the position of the vibration compensation unit within a certain range of movement; a range setting unit that sets a movement permitted range that is a range within the range of movement in which the vibration compensation unit can be positioned by being driven by the drive unit during vibration compensation; and a centering unit that controls the drive unit after photography based upon a photographic actuation command by an operator has ended so that the vibration compensation unit is centered in the approximate center of the movement permitted range.