Optical Unit Shake Correction Gravity Center Shift
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Solution Overview
Problem
Existing optical units with shake correction functions for cameras, such as those mounted on cell phones, face challenges in minimizing size while effectively correcting hand shake, as traditional swing mechanisms require significant space and do not adequately shift the gravity center to suppress mechanical resonance.
Innovation Solution
An optical unit with a movable module that includes an optical element and a weight positioned on one side of the optical axis, allowing the gravity center to be shifted closer to the support mechanism, reducing the displacement on the front side and minimizing the required space perpendicular to the optical axis, while the weight's design, including a flat end face and cylindrical tube shape, ensures effective mass distribution and resonance suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical module is swingably supported at a rear side position in the optical axis direction, then the shake correction function is achieved, but the displacement amount on the front side becomes large requiring significant space perpendicular to the optical axis
Solution Approach 1:
The patent shifts the support position from the rear side to a midway position in the optical axis direction, effectively using the optical axis dimension to reduce the required space perpendicular to the optical axis. This dimensional repositioning allows the optical module to swing with smaller front-side displacement.
Solution Approach 2:
The patent pre-positions the support mechanism at a midway point rather than at the rear side, preparing the system in advance to minimize displacement. By establishing the pivot point closer to the front, the system proactively reduces the space requirement before the shake correction operation begins.
2Weight of moving object
If a weight is provided on the rear side end part of the optical module, then the volume occupied in the optical axis direction is large, but the effect for shifting the gravity center position is small
Solution Approach 1:
The patent applies local quality by concentrating the weight at the rear side end part of the optical module, creating a localized mass concentration that maximizes the gravity center shift effect. This localized weighting strategy efficiently shifts the gravity center toward the support position without requiring excessive overall volume.
Solution Approach 2:
The patent introduces asymmetry by positioning the weight specifically at the rear side end part rather than distributing mass uniformly. This asymmetric mass distribution creates a deliberate offset in the gravity center position, enabling effective suppression of mechanical resonance during shake correction.
3Area of stationary object
If the optical module is swingably supported at a midway position, then the displacement amount on the front side is reduced, but the gravity center position needs to be shifted closer to the support position to suppress mechanical resonance
Solution Approach 1:
The patent uses a weight as a counterbalance element positioned at the rear side end part to shift the gravity center position toward the midway support position. This counterweight strategy compensates for the displacement between the support position and the original gravity center, suppressing mechanical resonance while maintaining the compact midway support configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the size of the optical unit by minimizing the required space perpendicular to the optical axis and effectively suppresses mechanical resonance during shake correction, allowing for more compact and stable image capture.
Implementation Method 1
a weight which is provided on one side of a front side and a rear side in an optical axis direction of the optical module for shifting a gravity center position of the movable module to a support position side of the support mechanism relative to a gravity center position of the optical module in the optical axis direction
Data Source
AI summary
An optical unit with a shake correction function may include a movable module holding an optical element; a fixed body; a support mechanism swingably supporting the movable module at a midway position in an optical axis direction; and a shake correction drive mechanism to swing the movable module. The movable module may include an optical module which holds the optical element; and a weight provided on one side of a front side and a rear side in the optical axis direction of the optical module, the weight being configured to shift a gravity center position of the movable module to a support position side of the support mechanism relative to a gravity center position of the optical module in the optical axis direction. An end face of one side of the weight may be formed in a flat face which is perpendicular to the optical axis direction.