Dual Shake Correction in Optical Viewfinder Imaging
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Solution Overview
Problem
Existing image capturing devices face challenges in accurately correcting image shake, as switching between lens-based and body-based shake correction functions can result in incomplete shake correction, with limitations in the movable range of correction lenses and imaging elements leading to residual shake.
Innovation Solution
An image capturing device with dual detection and correction units for both lens and body shake, operating in observation and image capture modes to dynamically share shake correction tasks, with the lens unit correcting high-frequency components and the body unit correcting low-frequency components, ensuring comprehensive shake correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If only lens-based shake correction is used during observation mode, then operational simplicity is improved, but shake correction accuracy deteriorates when switching to capture mode
Solution Approach 1:
The patent implements dynamic switching of shake correction modes based on operational state. During observation mode, only lens-based correction is active for simplicity. Upon detecting capture mode transition (via shutter signal), the system dynamically activates body-based correction to enhance accuracy, then gradually blends to cooperative correction. This dynamic adaptation resolves the contradiction by adjusting correction intensity based on operational context.
Solution Approach 2:
The system performs preliminary preparation by maintaining lens-based correction continuity during mode transition. The control unit detects the shutter signal in advance and prepares to activate body-based correction units before the actual capture moment, ensuring seamless transition without shake correction gaps. This preliminary action prevents accuracy deterioration during the critical switching phase.
2Reliability
If body-based shake correction is activated during mode transition, then shake correction coverage is improved, but device complexity increases
Solution Approach 1:
The patent segments shake correction into distinct functional modules: lens-based correction units (first correction units) and body-based correction units (second correction units). Each module operates independently with dedicated detection and correction mechanisms. This segmentation allows selective activation based on mode, improving coverage without requiring all units to operate simultaneously, thus managing complexity through modular architecture.
Solution Approach 2:
The control unit serves multiple functions: it detects operational mode transitions, manages lens-based correction during observation, activates body-based correction during capture, and coordinates cooperative correction. This multi-functionality reduces overall system complexity by using a single control brain rather than separate control circuits for each correction mode, resolving the contradiction between comprehensive coverage and device complexity.
3Measurement precision
If cooperative shake correction is implemented, then correction accuracy is improved, but control complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the control unit continuously monitors operational mode (observation vs. capture) and adjusts correction strategies accordingly. The system detects shutter signals as feedback triggers to transition from lens-only correction to cooperative correction. This feedback-based control simplifies the coordination complexity by using clear state transitions rather than continuous complex optimization algorithms.
Solution Approach 2:
The system maintains continuous shake correction throughout all operational phases. During observation mode, lens-based correction operates continuously. Upon mode transition to capture, body-based correction is activated and both work cooperatively, ensuring uninterrupted correction. This continuity principle simplifies control logic by avoiding correction gaps or abrupt transitions, maintaining stable operation throughout the mode change.
Data Source
AI summary
An image capturing device includes an imaging lens, an image capturing device main body, a first detection unit that detects a shake amount of the imaging lens, a second detection unit that detects a shake amount of the image capturing device main body, a first driving unit that performs image shake correction by a correction lens based on a detection result of the first detection unit, a second driving unit that performs image shake correction by the image capturing device main body based on a detection result of the second detection unit, a finder that is used for observing an optical image transmitting through the imaging lens, a reception device that receives an image capturing instruction of the optical image, and a CPU and a CPU that perform, in an optical view mode in which the optical image is observed by the finder, a control of causing each of the first detection unit and the second detection unit to detect the shake amount and causing only the first driving unit to perform image shake correction except for a case where the image capturing instruction is being received.