Folded Camera VCM Actuator for Compact OIS and Autofocus
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Solution Overview
Problem
Small form factor cameras face challenges in achieving high-resolution optical image stabilization and autofocus within compact designs, as existing mechanisms often compromise on size and efficiency due to the need for complex optical arrangements and stabilization systems.
Innovation Solution
The implementation of a folded optics arrangement with voice coil motor (VCM) actuators and a suspension system that includes magnets and coils to provide precise movement of lens groups and prisms, allowing for both autofocus and optical image stabilization while maintaining a compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional optical stabilization and autofocus mechanisms are used, then image quality and focus adjustment are improved, but the camera size and structural complexity increase
Solution Approach 1:
The patent combines optical image stabilization (OIS) and autofocus (AF) functions into a single integrated actuator system. The voice coil motor simultaneously controls both the tilt angle of the prism for OIS and the position of the lens group for AF, merging two previously separate mechanisms into one unified structure that reduces overall complexity while maintaining both functions.
Solution Approach 2:
The actuator system is designed to perform multiple functions: it provides optical image stabilization by tilting the prism, enables autofocus by moving the lens group, and both operations are controlled through a single actuator assembly. This multi-functional design eliminates the need for separate OIS and AF mechanisms, thereby reducing structural complexity.
2Reliability
If optical image stabilization and autofocus mechanisms are added, then image stability and focus adjustment are improved, but the camera form factor increases
Solution Approach 1:
The actuator assembly is nested within the existing camera module structure. The voice coil motor, prism, and lens group are arranged in a compact nested configuration where the prism is positioned to utilize existing optical paths and the lens group movement is constrained within the available space, minimizing the overall volume increase.
Solution Approach 2:
The patent utilizes the tilt angle dimension of the prism for optical image stabilization instead of requiring linear movement in multiple dimensions. By rotating the prism around a pivot point, the system achieves stabilization without needing additional space for linear actuators, effectively using angular movement to conserve volume.
3Volume of moving object
If compact camera design is prioritized, then form factor is reduced, but optical image stabilization and autofocus performance deteriorate
Solution Approach 1:
The prism acts as an intermediary optical element that enables image stabilization without requiring large mechanical movements. By tilting the prism, the optical path is redirected to compensate for camera shake, achieving stabilization performance with minimal mechanical displacement and maintaining a compact form factor.
Solution Approach 2:
The patent replaces traditional mechanical stabilization mechanisms (such as moving the entire lens assembly or using complex gimbal structures) with a lighter prism tilting mechanism actuated by a voice coil motor. This substitution reduces the mass and volume of moving parts while maintaining stabilization effectiveness.
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 solution enables effective autofocus and optical image stabilization in a compact camera module by using VCM actuators to move lens groups and prisms with high precision, improving image quality and stability without increasing the camera's size or complexity.
Implementation Method 1
an actuator module configured to move the lens group relative to the image sensor... voice coil motor (VCM) actuators and a suspension system that includes magnets and coils to provide precise movement
Data Source
AI summary
Various embodiments include a camera with folded optics. Some embodiments include a voice coil motor (VCM) actuator module to provide autofocus (AF) and/or optical image stabilization (OIS) movement. Some embodiments include suspension arrangements. Some embodiments include flexure arrangements. In some embodiments the VCM actuator module includes an OIS actuator that tilts a prism.