Optical Element Driving Assembly for Compact Precise Positioning
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Solution Overview
Problem
The miniaturization of electronic devices, such as smartphones and laptops, poses challenges in mechanical design and reliability for driving mechanisms used in optical elements, leading to low positioning accuracy and reliability.
Innovation Solution
A driving mechanism comprising a fixed part, a movable part, and a driving assembly with vertical and horizontal coils, magnetic elements, and a flexible circuit board, which generates electromagnetic forces to move optical elements for auto-focusing and image stabilization, while minimizing size and increasing accuracy through precise positioning and reduced sensing magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple coils and magnets are used for adjusting lens focus, then the focusing function is achieved, but the device size increases and positioning accuracy decreases
Solution Approach 1:
The patent combines multiple coils (first coil and second coil) and multiple magnets (first magnet and second magnet) into a single integrated driving assembly that shares common structural components. The first and second members are merged into a unified movable structure, and the circuit board serves as a common platform for all electronic elements, reducing overall device volume while maintaining focusing functionality.
Solution Approach 2:
The driving assembly is designed to perform multiple functions using a single integrated structure. The same coil-magnet system handles both auto-focusing (moving the lens along the optical axis) and optical image stabilization (counteracting hand shake), eliminating the need for separate mechanisms and thereby reducing device size while improving positioning accuracy.
2Volume of moving object
If device miniaturization is pursued, then device size decreases, but mechanical design difficulty increases and reliability decreases
Solution Approach 1:
The patent replaces traditional complex mechanical linkages with an electromagnetic driving system consisting of coils and magnets. This substitution eliminates mechanical wear and friction issues, improving reliability while enabling miniaturization. The electromagnetic force directly moves the lens without requiring complex mechanical transmission components.
Solution Approach 2:
The patent optimizes the parameters of the electromagnetic components (coil turns, magnet strength, spacing) to achieve reliable operation in a miniaturized configuration. By carefully adjusting these parameters, the system maintains sufficient driving force and positioning accuracy while keeping the device size small, thereby ensuring mechanical reliability in a compact form factor.
3Volume of moving object
If device miniaturization is pursued, then device size decreases, but positioning accuracy decreases
Solution Approach 1:
The patent introduces a position sensor as an intermediary element that provides feedback on the lens position to the control circuit. This feedback mechanism enables precise positioning control even in a miniaturized system by continuously monitoring and adjusting the lens position based on detected deviations, thereby maintaining high positioning accuracy despite reduced device size.
Solution Approach 2:
The control circuit receives position information from the position sensor and adjusts the coil currents accordingly to achieve precise lens positioning. This closed-loop feedback system compensates for the limitations of miniaturization by actively correcting positioning errors, ensuring high accuracy is maintained despite the smaller device dimensions.
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 enhances the reliability and miniaturization of the driving mechanism, improving positioning accuracy and reducing crosstalk errors, thus enabling efficient auto-focusing and optical image stabilization in compact electronic devices.
Implementation Method 1
the driving assembly includes a vertical coil and a horizontal coil; the first electronic element is a position sensor for detecting a position of the movable part along an optical axis and the second electronic element is a control circuit for controlling currents of the vertical coil and the horizontal coil based on the position of the movable part
Implementation Method 2
the driving assembly includes a first magnetic element disposed on the movable part and a second magnetic element disposed on the fixed part
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 optical element relative to the fixed part.