Camera Drive Device with Magnetic Spherical Contact
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Solution Overview
Problem
Conventional camera driving apparatuses face challenges in compensating for camera shake, especially when the camera is moved significantly, as they lack the necessary degree of freedom and accuracy in controlling tilt angles and rotation around the optical axis, leading to compromised image quality due to motion blur.
Innovation Solution
A camera driving apparatus that includes a movable unit with attracting magnets, a convex partial sphere, and a fixed unit with a depressed portion for magnetic contact, allowing for panning, tilting, rolling, and optical axis shifting of the camera section, equipped with detectors for precise angle detection and control, enabling compensation in three-axis directions and along the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional camera shake compensation mechanisms are used, then the structure is simple, but the degree of freedom for controlling camera section is insufficient
Solution Approach 1:
The camera section is divided into multiple independently controllable components: lens barrel, image sensor, and reflective mirror. Each component can be tilted or shifted separately along different axes, enabling six-degree-of-freedom control. This segmentation allows comprehensive camera shake compensation while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The invention adds control along the optical axis direction (longitudinal direction) in addition to the traditional two-dimensional plane control. This dimensional expansion enables the camera section to perform not only tilting but also shifting operations, significantly increasing the degree of freedom for shake compensation.
2Adaptability or versatility
If conventional tilt control is used, then the control range is limited, but the device remains compact
Solution Approach 1:
A reflective mirror is introduced as an intermediary component between the lens and image sensor. This mirror can be tilted independently to redirect light paths, effectively expanding the tilt angle range without requiring large physical movements of the entire camera section, thus maintaining compact device size while increasing adaptability.
Solution Approach 2:
The system adds longitudinal shifting capability along the optical axis, allowing components to move not only laterally but also in the depth direction. This multi-dimensional movement capability expands the effective tilt angle range while keeping the overall device footprint compact through precise positional control.
3Reliability
If conventional camera shake compensation is used, then basic motion blur is addressed, but high-frequency control during walking is insufficient
Solution Approach 1:
The camera section components are designed to perform multiple functions simultaneously: tilting in panning and tilting directions, rolling around the optical axis, and shifting along the optical axis. This multi-functionality enables the system to handle various types of camera shake including high-frequency vibrations during walking, significantly improving compensation reliability across different motion scenarios.
Solution Approach 2:
The system employs dynamic control where the position and orientation of camera section components are continuously adjusted in real-time based on detected shake movements. The independent actuators for each degree of freedom enable rapid response to high-frequency vibrations, achieving effective compensation even during walking motions that were previously uncontrollable.
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 solution provides a robust and compact camera driving apparatus capable of effective camera shake compensation, focus control, nodal point correction, and motion blur measurement, even during walking, by allowing larger tilt angles and higher frequency control, thus improving image quality and reducing mechanical resonance.
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
This camera driving apparatus 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 either the entire camera section or just its lens or image sensor in an optical axis direction with respect to the movable unit; a first detector which detects the tilt angles of the camera section in the panning and tilting directions with respect to the fixed unit; 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 magnitude of shift of either the camera section or its lens or image sensor in the optical axis direction.