Optical Element Drive Mechanism With Perpendicular Motion Conversion
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Solution Overview
Problem
The challenge in miniaturizing optical element driving mechanisms for electronic devices is to design a mechanism that allows for precise movement of optical elements while maintaining a compact size, as conventional designs often require longer transmission elements to achieve larger movement ranges, leading to increased thickness and reduced miniaturization potential.
Innovation Solution
The optical element driving mechanism incorporates a piezoelectric element, transmission element, clamping element, conversion element, magnetic elements, and intermediate elements, where the piezoelectric element drives the transmission element, and the magnetic elements interact to move the movable portion in a direction perpendicular to the optical axis, enabling auto focusing and optical image stabilization with a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional transmission elements are used to achieve larger movement range, then the movement range of the movable portion is improved, but the thickness of the optical element driving mechanism increases
Solution Approach 1:
The patent changes the movement direction of the transmission element from the optical axis direction to a direction perpendicular to the optical axis. The piezoelectric element moves the transmission element in a first direction (perpendicular to optical axis), which then moves the movable portion in a second direction (parallel to optical axis) through magnetic interaction. This dimensional transformation allows achieving larger movement range without increasing thickness along the optical axis.
Solution Approach 2:
The patent replaces direct mechanical transmission along the optical axis with a combined piezoelectric-magnetic mechanism. The piezoelectric element generates linear movement, and magnetic elements convert this to perpendicular movement of the movable portion. This substitution enables more efficient space utilization and avoids the need for long mechanical transmission elements along the optical axis.
2Length of moving object
If the transmission element is made longer to increase movement range, then the movement capability is improved, but the overall size of the device increases
Solution Approach 1:
By transforming the transmission element's movement from the optical axis direction to a perpendicular direction, the patent achieves larger movement range in the optical axis direction without increasing the overall device volume. The piezoelectric element moves perpendicular to the optical axis, while the movable portion moves parallel to the optical axis through magnetic coupling, effectively utilizing three-dimensional space.
Solution Approach 2:
The patent nests the magnetic elements within the transmission element structure, with first magnetic elements embedded in the transmission element and a second magnetic element positioned on the movable portion. This nested arrangement allows the transmission element to be more compact while still achieving the required movement range through the combined piezoelectric-magnetic mechanism.
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 configuration allows for a more miniaturized optical element driving mechanism with a larger movement range of the movable portion without increasing the overall thickness, utilizing space efficiently and enhancing the miniaturization of optical devices.
Implementation Method 1
The piezoelectric element has a circular plate shape extending in a third direction and the second direction. The transmission element is moved along the first direction by the piezoelectric element
Implementation Method 2
Two first magnetic elements are disposed on the conversion element. The second magnetic element is disposed on the movable portion. The movable portion is driven to move along the second direction by a force between the first magnetic elements and the second magnetic element
Data Source
AI summary
An optical element driving mechanism has an optical axis and includes a fixed portion, a movable portion, and a driving assembly. The movable portion is movable relative to the fixed portion. The driving assembly drives the movable portion to move relative to the fixed portion. The driving assembly moves in a first direction to move the movable portion in a second direction, wherein the first direction is different from the second direction.