Five-Axis Sensor-Shift Actuator Assembly for Compact Camera Stabilization
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Solution Overview
Problem
Existing camera modules in small form factor devices face challenges in providing effective autofocus and optical image stabilization across multiple axes, particularly in compact designs where magnetic interference and mechanical complexity hinder efficient motion control of the image sensor.
Innovation Solution
An actuator assembly integrating axial and transversal actuators, utilizing voice coil motors, allows for five-axis motion control of the image sensor, including parallel and orthogonal movements, with independent movement mechanisms to minimize interference and maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
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 motion control system into separate actuators for the optical lens and image sensor. The optical lens is controlled by a first actuator while the image sensor is controlled by a second actuator, allowing independent movement and stabilization without requiring the entire assembly to move as one rigid body.
2Adaptability or versatility
If multiple actuators are added for five-axis motion control, then stabilization capability is improved, but magnetic interference and mechanical complexity increase
Solution Approach 1:
The patent combines multiple actuator functions into an integrated actuator assembly that provides five-axis motion control. The first and second actuators are positioned and configured to work together in a coordinated manner, reducing the overall mechanical complexity compared to having completely separate stabilization systems.
Solution Approach 2:
The patent implements five-axis motion control by adding rotational degrees of freedom (pitch and roll axes) to the traditional three-axis translational control. This allows the image sensor to be stabilized not only in position but also in orientation, providing comprehensive stabilization while maintaining a compact design.
3Volume of moving object
If compact design is used for small form factor devices, then device size is reduced, but magnetic interference hinders efficient motion control
Solution Approach 1:
The patent positions the image sensor between the optical lens and the actuator assembly, creating a spatial arrangement that minimizes magnetic interference. The actuator assembly is configured to generate magnetic fields for actuation while the image sensor's position and shielding structures reduce the impact of these magnetic fields on sensor performance.
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 and autofocus capabilities by compensating for user handshake and dynamic tilt, reducing magnetic cross-talk, and allowing for complex lens designs without increasing module height, while maintaining high bandwidth and frequency.
Implementation Method 1
utilizing voice coil motors
Implementation Method 2
optical image stabilization (OIS) mechanisms that may sense and react to external excitation/disturbance by adjusting location of the optical lens and/or the image sensor
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.