Five-Axis Sensor-Shift Actuator Assembly for Compact Camera Modules
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Solution Overview
Problem
Existing camera technologies face challenges in providing high-resolution image stabilization and autofocus in small form factor devices due to limitations in actuator mechanisms, particularly in handling multiple axes of motion.
Innovation Solution
An actuator assembly integrating axial and transversal actuators, including voice coil motors, to drive an image sensor in five different ranges of motion, allowing for autofocus and optical image stabilization by moving the image sensor in parallel and orthogonal directions to the optical axis, with independent movement facilitated by suspension structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single rigid body moves the optical lens and image sensor together for autofocus, then the structure is simple, but optical image stabilization cannot be achieved independently
Solution Approach 1:
The patent divides the imaging system into separate movable components: the optical lens assembly can move independently for autofocus, while the image sensor assembly can move independently for optical image stabilization. This segmentation allows each component to be controlled by dedicated actuators, enabling independent stabilization without requiring the entire system to move together.
Solution Approach 2:
The camera module integrates multiple functions into a compact design where the same structural framework supports both autofocus (lens movement) and optical image stabilization (sensor movement). The actuator assembly provides multi-functional capability by enabling independent control of different components for different purposes.
2Measurement precision
If five-axis sensor shift mechanism is implemented, then image stabilization precision is improved, but device complexity increases
Solution Approach 1:
The patent combines axial actuators and transversal actuators into a single integrated actuator assembly that controls the image sensor's movement in five degrees of freedom. By merging these actuator types into one unified structure, the patent reduces overall system complexity while maintaining the precision benefits of five-axis stabilization.
Solution Approach 2:
The suspension structure serves as an intermediary mechanism that couples the image sensor to the actuator assembly. This intermediary component enables complex five-axis motion control while simplifying the direct connection between actuators and sensor, making the system more manageable and less complex.
3Length of stationary object
If module height is reduced for small form factor, then device compactness is improved, but actuator mechanism space is limited
Solution Approach 1:
The patent transitions from traditional lateral placement of actuators to an axial arrangement where actuators are positioned along the optical axis. This dimensional change allows the actuator assembly to fit within the limited height of the module while still providing full five-axis control capability.
Solution Approach 2:
The patent employs a nested arrangement where the axial actuators and transversal actuators are integrated within each other's spatial envelope. The actuator assembly is positioned such that components are arranged concentrically or in overlapping configurations, maximizing space utilization within the compact module height.
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 actuator assembly enhances image stabilization by compensating for user handshake and dynamic tilt in five axes, providing improved coplanarity and reducing secondary motion, while allowing for complex lens designs and variable aperture mechanisms without increasing module height.
Implementation Method 1
An actuator assembly integrating axial and transversal actuators, including voice coil motors, to drive an image sensor in five different ranges of motion
Data Source
AI summary
An actuator assembly for a camera module is provided. The actuator assembly includes a transversal actuator for motion of an image sensor of the camera module in one or more directions orthogonal to an optical axis of the camera module. The actuator assembly also includes an axial actuator for motion of the image sensor in one or more directions parallel to the optical axis of the camera module. The actuator assembly further includes a carrier retaining a portion of the transversal actuator and a portion of the axial actuator. The carrier moves with the image sensor in the one or more directions orthogonal to the optical axis of the camera module and is static relative to motion of the image sensor in the one or more directions parallel to the optical axis of the camera module.