Optical Element Drive Mechanism for Compact OIS and Autofocus
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Solution Overview
Problem
Modern electronic devices with image-capturing and video-recording functions face challenges in reducing the size of optical element driving mechanisms while maintaining durability and achieving effective auto focus and optical image stabilization.
Innovation Solution
The optical element driving system comprises a fixed portion, first and second movable portions, first and second driving assemblies, and a connecting element, allowing for movement in different dimensions to achieve optical image stabilization, with a transmission element transmitting driving force and guiding elements reducing friction and enhancing miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the driving mechanism is miniaturized to meet modern device size requirements, then the device size is reduced, but the durability and reliability of the mechanism deteriorates
Solution Approach 1:
The driving mechanism is divided into multiple independent modules: a first driving assembly for driving the lens barrel assembly along the optical axis, and a second driving assembly for rotating the lens barrel assembly. This segmentation allows each module to be optimized independently for both size and reliability, enabling miniaturization without compromising overall durability.
Solution Approach 2:
The lens holder assembly is rotatably disposed within the lens barrel assembly, and the optical element is disposed within the lens holder assembly. This nested configuration allows multiple functional components to occupy overlapping spatial volumes, significantly reducing the overall size of the driving mechanism while maintaining the structural integrity and reliability of each component.
2Volume of moving object
If the driving mechanism is miniaturized, then the device becomes thinner and lighter, but the complexity of the mechanism increases
Solution Approach 1:
The lens holder assembly serves multiple functions: it holds the optical element, rotates to adjust the shooting angle, and its rotation drives the autofocus mechanism through the connecting assembly. This multi-functionality reduces the need for separate dedicated components, thereby simplifying the overall mechanism while achieving miniaturization.
Solution Approach 2:
The autofocus driving and focus adjustment functions are merged into a single integrated system where linear movement of the lens barrel assembly along the optical axis simultaneously achieves both autofocus and focus ring adjustment, reducing the number of separate mechanisms needed.
3Adaptability or versatility
If the lens holder assembly is rotatably connected to the lens barrel assembly, then the shooting angle adjustment is achieved, but the friction and wear increase
Solution Approach 1:
The second driving assembly uses a magnetic driving mechanism with magnetic elements and coils to rotate the lens holder assembly, replacing traditional mechanical contact-based rotation systems. This magnetic field-based actuation significantly reduces friction and wear while maintaining the shooting angle adjustment capability.
Data Source
AI summary
An optical element driving system is provided. The optical element driving system includes a fixed portion, a first movable portion, a second movable portion, a first driving assembly, a second driving assembly, and a connecting element. The first movable portion is used for moving relative to the fixed portion. The second movable portion is used for holding an optical element having a main axis, and is movable relative to the first movable portion. The first driving assembly is used for driving the first movable portion to move relative to the fixed portion in a first dimension. The second driving assembly is used for driving the second movable portion to move relative to the first movable portion in a second dimension. The connecting element connects the first movable portion and the second movable portion.