Lens Driving Apparatus Corner Magnet Nesting for Miniaturization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lens driving apparatuses for camera-equipped mobile terminals face challenges in miniaturization due to the required space for permanent magnets and coils, hindering further size reduction despite growing demand for thinner devices.
Innovation Solution
A lens driving apparatus with a square lens holder moving section and driving magnets at its corners, utilizing air-core coils and strategically positioned permanent magnets to enable movement in both optical axis and diagonal directions, supported by a suspension system for efficient miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If permanent magnets and coils are disposed in parallel with the outer periphery of the product, then the lens driving apparatus can achieve auto-focusing and camera-shake correction functions, but the size and thickness of the apparatus cannot be reduced further
Solution Approach 1:
The patent repositions the permanent magnet from a peripheral parallel arrangement to a corner-mounted configuration on the lens holder moving section. This spatial reconfiguration in the vertical dimension allows the coil to be disposed above the magnet, creating a stacked arrangement that reduces the horizontal footprint and enables miniaturization while preserving the electromagnetic driving function for both auto-focusing and camera-shake correction
Solution Approach 2:
The patent implements a nested configuration where the coil is positioned above the permanent magnet, and the magnet is mounted on the lens holder moving section. This layered stacking arrangement allows components to be nested vertically rather than arranged horizontally, reducing the overall device footprint and thickness while maintaining the necessary electromagnetic interaction for lens driving operations
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 a significant reduction in size, achieving miniaturization by optimizing the placement of magnets and coils, reducing the overall dimensions of the lens driving apparatus by over 45% compared to conventional designs.
Implementation Method 1
an auto-focusing first coil is disposed around the lens barrel (lens holder), and a permanent magnet is disposed to the lens holder moving section, whereby an auto-focusing lens driving section (hereinafter referred to as AF lens driving section) is configured. The AF lens driving section moves the lens holder in the optical axis direction by utilizing an electromagnetic force (Lorentz force) which acts on a first coil when a current is passed through the first coil
Implementation Method 2
a second coil is disposed in a spaced relationship with an auto-focusing permanent magnet in the optical axis direction, whereby a camera-shake correction lens driving section is configured. The camera-shake correction lens driving section moves the lens holder moving section and the lens holder along a plane orthogonal to the optical axis direction by utilizing an electromagnetic force which is generated when a current is passed through the second coil
Data Source
AI summary
A lens driving apparatus includes: a lens holder including an auto-focusing first coil; a lens holder moving section; driving magnets disposed at four corners of the lens holder moving section; a camera-shake correction second coil; a plurality of suspension wires; an elastic member; and at least one damper compound, wherein the elastic member comprises first and second leaf springs mounted to first and second ends of the lens holder moving section, respectively, the second leaf spring is arranged apart from the fixed member compared to the first leaf spring, the fixed member is disposed at a position in the vicinity of the first leaf spring, the plurality of suspension wires extend along the first direction, are fixed to the fixed member and the second leaf spring, and the damper compound is disposed at a position in the vicinity of the second leaf spring.