Lens Driving Device Orthogonal Shake Correction
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Solution Overview
Problem
Conventional lens driving devices in portable electronic devices suffer from image quality deterioration due to hand shake, as existing anti-shake mechanisms require larger forces and are inefficient in correcting orthogonal axis movements.
Innovation Solution
A lens driving device with a support frame that can freely move relative to a fixing base in the orthogonal direction, utilizing a second driving coil and magnet steel for electromagnetic interaction, combined with a spring leaf and magnetism detecting elements to adjust the optical axis and balance the lens module, thereby reducing shake-induced image quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional driving mechanism with a coil and permanent magnet is used for focusing, then the lens can be driven along the optical axis, but hand shake causes the lens to move continuously in a direction orthogonal to the optical axis, deteriorating image quality
Solution Approach 1:
The patent divides the driving system into two independent parts: a first driving mechanism (coil and permanent magnet) for optical axis focusing, and a second driving mechanism for orthogonal direction shake correction. This segmentation allows each mechanism to specialize in its specific function, with the second mechanism specifically addressing hand shake without interfering with the primary focusing function.
Solution Approach 2:
The patent introduces a support frame as an intermediary component between the lens barrel and the housing. This support frame acts as a mediator that can independently move in the orthogonal direction to the optical axis, absorbing and correcting hand shake movements while allowing the primary focusing mechanism to continue operating along the optical axis.
2Reliability
If a driving circuit is disposed at the bottom portion to drive the center of gravity of the lens module, then shake correction can be achieved, but a bigger force is required to correct shake in the direction orthogonal to the optical axis
Solution Approach 1:
The patent changes the spatial arrangement by moving the second driving mechanism from the bottom portion to the side portion of the lens module, perpendicular to the optical axis. This dimensional change allows the correction force to be applied more efficiently in the orthogonal direction, reducing the magnitude of force needed compared to driving from the bottom.
Solution Approach 2:
The patent applies local quality by placing the second driving mechanism specifically at the side portion where it can most effectively counteract orthogonal shake. The magnet steel is positioned to locally concentrate the electromagnetic interaction exactly where needed for shake correction, rather than using a general bottom-driven approach that would require more force.
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 device effectively stabilizes the lens module, improving image quality by adjusting the optical axis and maintaining balance, thus enhancing the anti-shake functionality without the need for excessive force.
Implementation Method 1
a second driving coil and a magnet steel that interact with each other through electromagnetic interaction, so that the support frame is driven in a direction orthogonal to the optical axis direction of the lens
Implementation Method 2
a magnetism detecting element disposed at the fixing base and configured to detect a position of the lens module in an optical axis direction of the lens
Data Source
AI summary
The present disclosure provides a lens driving device which is small and has good focus adjustment and hand shake correction. The lens driving device includes: a case; a lens module; a support frame; a spring leaf; a support part connecting the support frame with the fixing base in such a manner that the support frame is freely movable relative to the fixing base in a direction orthogonal to an optical axis of a lens; a magnet steel; a first driving coil; and a second driving coil. Under an electromagnetic interaction between the second driving coil and a second portion of the magnet steel opposite to the second driving coil, the support frame moves relative to the fixing base in the direction orthogonal to the optical axis of the lens.