Lens Driving Device Cylindrical Elastic Support Anti-Torsion
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Solution Overview
Problem
Existing lens driving devices face challenges in ensuring the planeness of connecting portions and have poor anti-torsion strength, leading to undesirable performance due to potential misalignment and movement perpendicular to the central axis.
Innovation Solution
The design incorporates cylindrical elastic supporting portions with guiding posts and engaging holes to stabilize the lens holder, ensuring it moves along the central axis, with a magnetic force interaction between a coil and permanent magnet for precise movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If plate springs with connecting portions are used to support the lens element, then the lens element can be suspended and driven to move, but the planeness of the connecting portions cannot be ensured, causing misalignment and movement perpendicular to the central axis
Solution Approach 1:
The patent replaces the flat plate spring structure with a cylindrical elastic supporting portion. This curved/spheroidal shape provides inherent structural stability and anti-torsion properties, eliminating the planeness issues of flat connecting portions while maintaining the ability to support and drive the lens element along the central axis.
Solution Approach 2:
The patent uses an elastic cylindrical supporting portion that combines flexibility with structural integrity. This elastic structure can deform to allow lens movement while maintaining its cylindrical shape to prevent misalignment, solving both the movement requirement and the planeness problem.
2Ease of operation
If plate springs are used to support the lens element, then the lens element can be driven to move along the axis, but the anti-torsion strength is poor, leading to undesirable device performance
Solution Approach 1:
The cylindrical shape of the elastic supporting portion provides superior anti-torsion strength compared to flat plate springs. The curved structure resists twisting forces more effectively, preventing unwanted lateral movements and maintaining alignment while still allowing controlled movement along the central axis.
Solution Approach 2:
The patent employs an elastic material for the cylindrical supporting portion that combines flexibility for movement with high anti-torsion strength. This material selection resolves the contradiction between enabling lens element movement and providing sufficient resistance to torsional forces.
3Ease of operation
If connecting portions are used in plate springs, then the lens element can be supported, but misalignment occurs between the moving direction and the central of the lens element
Solution Approach 1:
The cylindrical elastic supporting portion eliminates the need for separate connecting portions. The uniform cylindrical shape provides a single, well-defined support point that naturally maintains alignment between the lens element's movement and its central axis, eliminating the misalignment issues inherent in plate spring designs with multiple connecting portions.
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 enhances the stability and alignment of the lens holder, preventing movement perpendicular to the central axis and improving the overall performance of the lens driving device.
Implementation Method 1
a coil 2 and a permanent magnet 3 respectively attached on the lens holder 1 and a case 6 mounted on the base 42. The permanent magnet 3 interacts with the coil 2 for generating a magnetic force
Implementation Method 2
The elastic supporting portions 5 defines an elastic force which is more than a weight of the movable cover but not more than the resultant of the weight of the movable cover and the magnetic force
Data Source
AI summary
An lens driving device is disclosed. The lens driving device includes a base, a lens holder mounted on the base, a movable cover opposite to the a lens holder, a elastic supporting portion received into the lens holder and engaged with the movable cover, a coil and a permanent magnet respectively attached on the lens holder. The permanent magnet interacts with the coil for generating a magnetic force for driving the lens holder to move toward the base along a central axis of the lens holder. The elastic supporting portion defines an elastic force which is more than a weight of the movable cover but not more than the resultant of the weight of the movable cover and the magnetic force. While assembled, the lens driving device further defines a movable distance between an upper surface of the supporting elements and a first surface of the movable cover.