Optical Element Driving Mechanism With Compact Electromagnetic Actuation
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Solution Overview
Problem
The miniaturization of electronic devices, such as smartphones and laptops, complicates the mechanical design of lens focus adjustment, leading to low reliability and driving force for moving optical elements, which is a challenge in achieving effective auto-focusing and optical image stabilization.
Innovation Solution
A driving mechanism comprising a fixed and movable part, with a coil and magnetic element configuration, supported by spring sheets and damping gel, allowing for precise movement of the optical element along the optical axis, enhancing reliability and performance while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If electronic devices are miniaturized, then the device size is reduced, but the driving force for moving the optical element becomes insufficient
Solution Approach 1:
The patent replaces traditional mechanical driving mechanisms with an electromagnetic driving assembly consisting of a coil and magnetic element. This substitution enables sufficient driving force to be generated within a miniaturized structure, as electromagnetic forces can produce high force density in compact volumes, thereby resolving the contradiction between small device size and adequate driving force for optical element movement.
2Volume of moving object
If electronic devices are miniaturized, then the device size is reduced, but the reliability of the mechanical design deteriorates
Solution Approach 1:
The patent divides the driving mechanism into distinct functional modules: a fixed part, a movable part holding the optical element, and a driving assembly. This segmentation allows each component to be optimized independently for reliability while maintaining overall compactness. The movable part can be precisely controlled within the miniaturized housing, improving mechanical reliability through modular design.
Solution Approach 2:
The patent employs spring sheets with specific elastic properties and damping materials to control the mechanical parameters of the movable part. By carefully selecting and adjusting these parameters (spring constant, damping coefficient), the system achieves reliable and repeatable movement of the optical element within the constrained miniaturized space, ensuring consistent performance.
3Volume of moving object
If the driving mechanism is designed for compactness, then the device size is reduced, but the driving force becomes insufficient
Solution Approach 1:
The patent uses thin spring sheets as both structural and functional elements. These flexible films provide the necessary mechanical support while occupying minimal volume, and simultaneously serve as part of the driving mechanism by converting electromagnetic forces into controlled mechanical movement. This approach enables sufficient driving power within a compact volume by utilizing the dual functionality of thin flexible components.
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 solution enables reliable and efficient auto-focusing and optical image stabilization in miniaturized electronic devices by ensuring robust mechanical design and sufficient driving force, while maintaining a compact and aesthetically pleasing form factor.
Implementation Method 1
The driving assembly is configured for moving the movable part relative to the fixed part... the driving assembly includes a coil and a magnetic element
Implementation Method 2
the driving mechanism further includes an upper spring sheet... the lower spring sheet is connected between the base and the movable part
Implementation Method 3
the driving mechanism further includes a damping gel, wherein the first column further has an inner connecting portion, and the damping gel is connected between the movable part and the inner connecting portion
Data Source
AI summary
A driving mechanism for moving an optical element is provided. The driving mechanism includes a fixed part, a movable part, and a driving assembly. The movable part is movably connected to the fixed part for holding the optical element. The driving assembly is configured for moving the movable part relative to the fixed part.