Lens Driving Device with Gravity-Centered Hand-Shake Correction
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Solution Overview
Problem
Lens driving devices in portable electronic devices suffer from image quality degradation due to continuous lens movement orthogonal to the optical axis caused by hand shake during photography, and existing hand-shake correction mechanisms generate drive noise and require excessive force to correct jitter.
Innovation Solution
A lens driving device with a receiving space containing a lens module, spring piece, supporting frame, and two electromagnetic driving devices, where the second electromagnetic driving device is positioned near the lens module's gravity center to adjust movement orthogonal to the optical axis, utilizing magnet steel and coils for electromagnetic action, and incorporating a magnetic detecting element for precise adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hand-shake correction device is added to correct lens jitter, then image quality is improved, but drive noise is generated by the drive circuit and image jitter is caused by rotation of the hand-shake correction component
Solution Approach 1:
The patent extracts the hand-shake correction function from a separate correction device and integrates it into the lens driving mechanism itself. The lens driving device now performs both focusing (optical axis movement) and hand-shake correction (orthogonal direction movement) through the same electromagnetic driving mechanism, eliminating the need for a separate correction device that would generate additional noise and jitter.
Solution Approach 2:
The patent merges the focusing function and hand-shake correction function into a single lens driving device. The electromagnetic driving device can drive the lens module to move along the optical axis for focusing and also move it in directions orthogonal to the optical axis for hand-shake correction, combining multiple functions into one integrated system that avoids the harmful effects of separate correction devices.
2Reliability
If the gravity center of the lens module is positioned away from the drive circuit for hand-shake correction, then correction capability is improved, but a stronger force is required to correct the jitter
Solution Approach 1:
The patent positions the second electromagnetic driving device near the horizontal plane of the gravity center of the lens module, utilizing the horizontal dimension for hand-shake correction. By driving the lens module to move in directions orthogonal to the optical axis (horizontal movements) rather than requiring vertical movements away from the drive circuit, the system achieves effective hand-shake correction with reduced force requirements.
3Adaptability or versatility
If the lens module moves freely in all directions, then operational flexibility is improved, but continuous movement orthogonal to the optical axis causes image quality degradation
Solution Approach 1:
The patent implements dynamic control of the lens module's movement through electromagnetic driving devices that can precisely control the lens module's position in three-dimensional space. The system allows free movement for focusing along the optical axis while simultaneously providing active correction for orthogonal movements caused by hand-shake, maintaining operational flexibility while preventing image quality degradation through real-time dynamic adjustment.
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 solution effectively limits optical axis movement and rotation, thereby preventing jitter and enhancing image quality by balancing the lens module relative to its gravity center, reducing drive noise, and requiring less force for correction.
Implementation Method 1
the coil enables the camera lens frame to move along an optical axis direction of a lens under the action of an electromagnetic force
Implementation Method 2
the first electromagnetic driving device and the second electromagnetic driving device utilize an electromagnetic action generated by a magnet steel and a coil
Data Source
AI summary
A lens driving device which is small in size and good in focus adjustment and hand-shake correction disclosed, including: a housing, including a fixing base having a circuit substrate and a cover forming a receiving space; a spring piece connecting a lens module and a supporting frame; a supporting component for supporting the supporting frame and a second supporting frame in the housing; a first magnet steel, mounted and fixed on the supporting frame; a first drive coil, mounted on the lens module to enable a movement in an optical axis direction under an electromagnetic action; and a second drive coil, disposed on the fixing bases, and oppositely disposed near a horizontal plane of a gravity center of the lens module above a second magnet steel so that the second magnet steel mounted on the supporting frame moves along a direction orthogonal to the optical axis under the electromagnetic action.