Camera Drive Device Using Magnetic Spherical Contact for Shake Compensation
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Solution Overview
Problem
Conventional camera driving apparatuses face challenges in compensating for camera shake, especially when the camera is in motion, as they lack the necessary degree of freedom to effectively control camera sections and maintain accurate image stabilization, particularly at larger tilt angles and higher frequency ranges.
Innovation Solution
A camera driving apparatus with a movable unit featuring attracting magnets, a convex partial sphere, and a fixed unit with a depressed portion, allowing for panning, tilting, rolling, and two-dimensional image sensor movement within a plane perpendicular to the optical axis, along with detectors for precise angle and shift detection, enabling three-axis shake compensation and pixel-level image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional camera shake compensation mechanisms are used with limited degrees of freedom, then device complexity is reduced, but image stabilization precision deteriorates at larger tilt angles and higher frequencies
Solution Approach 1:
The camera shake compensation device is divided into multiple independent driving sections: a panning driving section for tilt compensation in the panning direction, a tilting driving section for tilt compensation in the tilting direction, and a rolling driving section for roll compensation. Each section operates independently with its own detector and driving mechanism, allowing precise compensation across multiple axes without requiring a single complex mechanism
Solution Approach 2:
The invention adds rotational degree of freedom around the optical axis (rolling direction) to the traditional two-axis (panning and tilting) compensation system. This third rotational dimension enables comprehensive compensation for camera shake in all directions, including rolling motion that was previously unaddressed, thereby improving stabilization precision without merely increasing the complexity of existing mechanisms
2Stability of the object's composition
If the movable unit is tightly fitted in the depressed portion, then positional stability is improved, but rotational freedom deteriorates
Solution Approach 1:
The movable unit is given a spherical outer shape that fits into a corresponding depressed portion in the fixed unit. This spherical configuration allows the movable unit to rotate freely in all directions (panning, tilting, and rolling) while maintaining continuous contact with the depressed portion, thereby achieving both rotational freedom and positional stability simultaneously
Solution Approach 2:
Magnetic attractive force is introduced as an intermediary between the movable unit and the fixed unit. The magnet in the fixed unit and the magnetic body in the movable unit create an attractive force that maintains positioning accuracy without requiring tight mechanical fitting, thus preserving rotational freedom while ensuring positional stability
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
The apparatus achieves robust and precise camera shake compensation across a broad frequency range, including high-frequency motion blur, by allowing larger tilt angles and two-dimensional image sensor adjustments, resulting in improved image quality and stability during both static and dynamic shooting conditions.
Implementation Method 1
brings the first convex partial sphere of the movable unit into a point or line contact with the depressed portion under magnetic attractive force of the at least one attracting magnet to the at least one magnetic body
Data Source
AI summary
A camera driving apparatus according to the present invention includes: a camera section with an imaging plane; a movable unit which houses the camera section inside and includes an attracting magnet and a convex partial sphere on its outer surface; a fixed unit which has a depressed portion in which a magnetic body and the movable unit are loosely fit, which brings the convex partial sphere of the movable unit into a point or line contact with the depressed portion under magnetic attractive force of the attracting magnet to the magnetic body, and which allows the movable unit to rotate freely on the spherical centroid of the first convex partial sphere; a panning driving section; a tilting driving section; a rolling driving section; a camera driving section which shifts an image sensor two-dimensionally in a plane that intersects with the optical axis at right angles and which rotates the image sensor on the optical axis; a first detector which detects the tilt angles of the camera section in the panning and tilting directions; a second detector which detects the angle of rotation of the camera section that is rotating in the rolling direction; and a third detector which detects the magnitudes of shift of the image sensor along the panning rotation axis and the tilting rotation axis.