Lens Driving Device 3-Axis Stabilization Circuit Integration
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Solution Overview
Problem
Existing lens driving devices face challenges in compactly integrating a 3-axis closed loop stabilization system due to limited space, making it difficult to assemble and maintain stability, especially in environments with insufficient light.
Innovation Solution
The design incorporates a lens holder with 3-dimensional circuits, suspension lines, and springs to connect the lens holder and frame, allowing for movement in both optical and perpendicular directions while keeping the circuit board connected, enabling efficient signal transmission and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 3-axis closed loop stabilization system is integrated into a compact lens driving device, then the device can compensate for camera shake in all directions, but the limited space makes it difficult to arrange the signal transmitting path and assemble the system
Solution Approach 1:
The patent combines the position sensor and driving coil directly on the outer surface of the lens holder, merging multiple functional components into a single integrated structure. This eliminates the need for separate signal transmitting paths and reduces assembly complexity while maintaining 3-axis stabilization functionality.
Solution Approach 2:
The lens holder serves multiple functions: it holds the lens portion, provides mounting surfaces for position sensors and driving coils, and acts as a structural component for the stabilization system. This multi-functionality reduces the number of separate components needed, simplifying assembly within the compact space.
2Reliability
If a position sensor for the optical axis direction is installed in the autofocus module, then 3-axis stabilization can be achieved, but the signal transmitting path requires more space to be arranged in a limited area
Solution Approach 1:
The position sensor and driving coil are arranged on the outer surface of the lens holder in a radial configuration, utilizing the three-dimensional space around the optical axis. This radial arrangement in multiple dimensions allows signal paths to be routed along the surface rather than requiring additional linear space, fitting the compact design.
Solution Approach 2:
The lens holder surface is divided into multiple segments or zones, with position sensors and driving coils placed at different locations. This segmentation allows independent routing of signal paths for each sensor-coil pair, optimizing space utilization and reducing interference between signal transmitting paths.
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 allows for easy assembly and low-cost implementation of a 3-axis closed loop stabilization system, effectively compensating for camera shake in all directions within a compact lens driving device.
Implementation Method 1
a position sensor and a driving coil on an outer surface of the lens holder... a sensed object facing the position sensor
Implementation Method 2
a driving coil on an outer surface of the lens holder... a plurality of driving magnets facing the driving coil
Implementation Method 3
a plurality of springs connected between the lens holder and the frame to allow the lens holder moving in an optical axis direction with respect to the frame
Implementation Method 4
a plurality of suspension lines connected between the plurality of springs and the circuit board to allow the frame and the lens holder moving in the direction perpendicular to the optical axis direction
Data Source
AI summary
A lens driving device includes a lens holder having a position sensor and a driving coil on an outer surface thereof; a frame accepting the lens holder and holding a plurality of driving magnets facing the driving coil and a hall magnet facing the position sensor; a plurality of springs connected between the lens holder and the frame to allow the lens holder moving in an optical axis direction with respect to the frame; a base portion having a circuit board; and a plurality of suspension lines connected between the springs and the circuit board to allow the frame and the lens holder moving in the direction perpendicular to the optical axis direction with respect to the base portion, wherein the circuit board is electrically connected to the position sensor and the driving coil through the suspension lines and the springs.