Optical Element Drive Assembly for Compact Autofocus and OIS
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Solution Overview
Problem
The challenge of reducing the size of optical systems in modern electronic devices while maintaining durability and functionality, particularly in achieving auto focus and optical image stabilization, has become crucial due to the trend towards smaller and more durable devices.
Innovation Solution
An optical element driving mechanism is designed with a movable portion and a fixed portion connected by guiding rods and magnetic elements, utilizing a driving assembly to move the movable portion relative to the fixed portion, enhanced by lubricating coatings and a position sensing assembly for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical system size is reduced to meet modern device requirements, then the device becomes more compact and portable, but the durability and precision of optical element movement may be compromised
Solution Approach 1:
The movable portion is nested within the fixed portion, with the optical element positioned inside the optical system housing. This nesting arrangement allows the optical system to be compact while maintaining the necessary movement space for the optical element, thus reducing overall size without compromising movement precision
Solution Approach 2:
The guiding rod acts as an intermediary component between the movable portion and fixed portion, providing precise guidance for optical element movement. This intermediary structure ensures that even in a compact design, the optical element can move accurately along the optical axis, maintaining reliability despite reduced system size
2Manufacturing precision
If guiding rods are used to connect the movable portion and fixed portion, then movement precision is improved, but the device complexity increases
Solution Approach 1:
The guiding rod serves multiple functions simultaneously: it guides the movement of the optical element, supports the movable portion, and maintains the structural integrity of the optical system. By making the guiding rod multi-functional, the design achieves precise movement without adding excessive structural complexity
Solution Approach 2:
The guiding rod is positioned at specific locations within the optical system where precision guidance is most needed. Rather than complex mechanisms throughout the entire system, the guiding rod provides localized precision support, achieving high manufacturing precision with minimal added complexity
3Reliability
If lubricating coatings are applied to the guiding rods, then the durability and smoothness of movement are enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent replaces complex mechanical lubrication systems with simple lubricating coatings applied directly to the guiding rod surfaces. This substitution maintains durable, smooth movement while avoiding the complexity of mechanical lubrication mechanisms, thus enhancing reliability without significantly increasing manufacturing complexity
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 mechanism effectively reduces the size of the optical system while ensuring durability and precise movement, enabling efficient auto focus and optical image stabilization.
Implementation Method 1
A first positioning magnetic element disposed on the movable portion. A second positioning magnetic element disposed on the movable portion
Implementation Method 2
A first lubricating coating is disposed on a surface of the first guiding rod. A second lubricating coating is disposed on a surface of the second guiding rod
Data Source
AI summary
An optical element driving mechanism is provided. The optical element driving mechanism includes a movable portion, a fixed portion, and a driving assembly. The movable portion is used to connect the optical element. The movable portion may move relative to the fixed portion. The driving assembly is used to drive the movable portion to move relative to the fixed portion.