Folded Optics Lens Assembly for Compact AF and OIS Cameras
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Solution Overview
Problem
Small form factor cameras face challenges in achieving high-resolution imaging with compact designs, particularly in integrating optical image stabilization and autofocus mechanisms effectively within limited space.
Innovation Solution
The use of folded optics arrangements combined with voice coil motor actuators allows for 3-axis movement of the lens group, enabling both autofocus and optical image stabilization while maintaining a reduced height, utilizing a dual-folded light path and suspension mechanisms for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional linear optics arrangement is used, then the camera can achieve high-resolution imaging with autofocus and image stabilization, but the camera height increases and the form factor becomes large
Solution Approach 1:
The patent applies folded optics to redirect the light path in multiple dimensions, transforming a linear optical path into a multi-dimensional folded path. This allows the optical system to achieve the required optical path length for high-resolution imaging while maintaining a compact camera height, effectively resolving the contradiction between imaging quality and device size
2Measurement precision
If optical image stabilization and autofocus mechanisms are integrated, then the camera achieves better imaging performance, but the device complexity increases
Solution Approach 1:
The patent combines autofocus and optical image stabilization functions into a single integrated lens assembly that moves as one unit. By merging these two functions into a unified mechanism rather than separate systems, the patent reduces overall device complexity while maintaining both focus precision and image stabilization performance
Solution Approach 2:
The movable lens assembly serves multiple functions simultaneously: it enables both autofocus by adjusting focal distance and optical image stabilization by compensating for hand shake. This multi-functional design reduces the number of separate components needed, thereby reducing device complexity while achieving both imaging goals
3Adaptability or versatility
If the lens group is moved for autofocus and stabilization, then the camera achieves versatile functionality, but the manufacturing precision requirements increase
Solution Approach 1:
The patent replaces traditional mechanical focus adjustment mechanisms with voice coil motor actuators that use electromagnetic fields to move the lens assembly. This substitution provides more precise and controlled movement with better repeatability, reducing manufacturing precision requirements while enhancing functional versatility for both autofocus and stabilization
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 enhances the camera's ability to achieve high-resolution imaging with compactness, providing effective autofocus and image stabilization by allowing precise movement of the lens group along multiple axes within a minimized space.
Implementation Method 1
an actuator arrangement including a voice coil motor actuator configured to move the lens group along an optical axis of the camera
Implementation Method 2
a movable lens group supported by a suspension mechanism
Data Source
AI summary
Various embodiments include a camera with folded optics and lens shifting capabilities. Some embodiments include voice coil motor (VCM) actuator arrangements to provide autofocus (AF) and/or optical image stabilization (OIS) movement. Some embodiments include suspension arrangements.