Integrated Magnet Lens Holder for Compact VCM Assembly
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Solution Overview
Problem
Conventional lens holding devices for mobile phone camera modules face challenges in productivity due to the low flexibility of magnet shapes, leading to time-consuming assembly and difficulty in miniaturization, as well as issues with downsizing in the radial direction.
Innovation Solution
The lens holding device features a magnet part with integrated first and second magnet parts, each with a different magnetic domain, and coils arranged to face their respective faces, allowing for miniaturization and easy assembly, along with alignment parts for precise spring positioning to enhance assembly and prevent lens misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If magnets are separated in circumferential direction to achieve specific magnetic domains, then magnetic field control is improved, but productivity deteriorates due to time-consuming assembly
Solution Approach 1:
The patent merges multiple magnet parts with different magnetic domains into a single integrated magnet structure. The magnet includes a first magnet portion and a second magnet portion with different magnetization directions, but they are formed as one piece rather than separate components. This integration maintains the complex magnetic field control needed for voice coil motor operation while eliminating the assembly steps required when using separated magnets, thereby resolving the contradiction between manufacturing precision and productivity.
2Manufacturing precision
If coils are arranged to surround the outer circumference of magnets, then magnetic field coverage is improved, but device size increases in radial direction
Solution Approach 1:
The patent changes the spatial arrangement from a radial configuration to an axial configuration. Instead of arranging coils around the outer circumference of magnets in the radial direction, the coil is positioned to face the second face of the magnet in the axial direction. This dimensional change allows the magnetic field to be generated effectively while reducing the radial size of the device, thus resolving the contradiction between magnetic field coverage and device compactness.
3Productivity
If magnet shape flexibility is reduced for easier manufacturing, then productivity is improved, but magnetic field precision deteriorates
Solution Approach 1:
The patent uses a composite magnet structure that combines different magnetic material regions within a single integrally formed component. The magnet includes portions with different magnetization directions (first and second magnet portions) that are manufactured as one piece using molding techniques. This composite approach allows complex magnetic field precision to be achieved while maintaining manufacturing ease through integral formation, resolving the contradiction between productivity and magnetic field precision.
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 design enables the lens holding device to be downsized in the radial direction, simplifies assembly, and enhances the driving force of the voice coil motors, while maintaining precise positioning and reducing the risk of lens inclination.
Implementation Method 1
a mechanism that coils attached to a lens holder are in magnetic fields formed by magnets and the lens holder is moved by the electromagnetic force generated in accordance with the electric current value of the coils
Implementation Method 2
a mechanism that the lens holder are supported by springs from both sides of an optical axis direction
Data Source
AI summary
A lens holding unit is held so that it can relatively move with respect to a base part to a direction vertical to an optical axis direction. The lens holding unit has a lens holder, a magnet part, and a spring. The lens holder has a first coil. The magnet part has a first magnet part which includes a first face facing to the first coil and a second magnet part which includes a second face vertical to the first face and constitutes a magnetic domain different from that of the first magnet part. These first magnet part and second magnet part are integrated.