OIS Leaf Spring for Smartphone Camera Shake Compensation
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Solution Overview
Problem
Conventional camera modules with suspension wires for optical image stabilization face challenges such as difficult assembly, inaccurate camera shake compensation, and reduced shock resistance due to the small diameter of the wires, leading to production yield issues and compromised image quality.
Innovation Solution
The proposed optical image stabilization structure uses OIS leaf springs with a wider width and bent portions to elastically couple the base housing and lens housing, allowing separate control of x-axis and y-axis movements and providing excellent z-axis rigidity, thus enhancing assembly ease and shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If suspension wires with small diameter are used to elastically couple the optical system, then the device can freely move within a predetermined range, but the assembly becomes difficult and shock resistance is reduced
Solution Approach 1:
The suspension wire is segmented into multiple sections with different diameters along its length. The first section has a larger diameter for easy assembly and shock resistance, while the second section has a smaller diameter for elastic coupling. This segmentation allows the wire to provide both mechanical strength and flexibility simultaneously.
Solution Approach 2:
Different sections of the suspension wire have different local properties - the first section has larger diameter for strength and assembly ease, while the second section has smaller diameter for elasticity. This local quality variation resolves the contradiction between needing strength for assembly and flexibility for movement freedom.
2Volume of moving object
If suspension wires with small diameter are used, then the optical system can be compactly supported, but shock resistance is reduced leading to production yield issues
Solution Approach 1:
The suspension wire is divided into sections with different diameters - the first section has larger diameter to provide shock resistance and reliability, while the overall structure remains compact. This segmentation allows the wire to withstand shocks without increasing the overall camera module volume excessively.
Solution Approach 2:
The suspension wire functions as a composite structure with different diameter sections, combining the properties of a thicker wire (shock resistance) with the benefits of a thinner wire (compact size). This composite approach resolves the contradiction between compactness and shock resistance.
3Adaptability or versatility
If conventional suspension wires are used for elastic coupling, then the optical system can move freely, but assembly precision and camera shake compensation accuracy are compromised
Solution Approach 1:
The suspension wire is segmented into a first section with larger diameter for precise assembly and positioning, and a second section with smaller diameter for flexible movement. This segmentation enables both precise assembly and free movement within the predetermined range.
Solution Approach 2:
The first section of the suspension wire with larger diameter provides preliminary stable positioning during assembly, ensuring manufacturing precision before the optical system begins its free movement operation. This preliminary action resolves the contradiction between assembly precision and movement freedom.
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 OIS leaf spring structure facilitates easier assembly, precise camera shake compensation in both x-axis and y-axis directions, and provides robust resistance to shocks, improving the overall performance and reliability of the camera module.
Implementation Method 1
an OIS leaf spring allowing the base housing and the lens housing to be elastically coupled to each other
Implementation Method 2
an OIS actuator allowing the optical system to be compensated for displacement which is caused by shaking of the optical system; The OIS actuator 140 includes an OIS coil 141 and a magnet 143
Data Source
AI summary
Disclosed is an optical image stabilization (OIS) structure that prevents camera shake occurring in a smartphone camera, and a camera module having the same. The OIS structure includes: a base housing provided with an OIS coil; a lens housing disposed over the base housing to be apart therefrom; and an OIS leaf spring for allowing the base housing and the lens housing to be elastically coupled to each other.