Reinforced OIS Actuator Structure for Compact Sensor Shift Cameras
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Solution Overview
Problem
The increasing weight of lens modules in camera modules interferes with precise control of driving force for optical imaging stabilization (OIS), affecting the performance of camera modules in portable electronic devices.
Innovation Solution
An actuator for OIS is designed with a movable frame reinforced by a stainless steel reinforcing plate, which has higher thermal conductivity and rigidity than the movable frame, and includes a driving unit with magnets and coils to move the image sensor perpendicular to the optical axis, reducing the height of the actuator and improving rigidity and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens module weight is increased to improve camera performance, then image quality is improved, but precise control of driving force for OIS deteriorates
Solution Approach 1:
Instead of moving the heavy lens module for OIS, the patent inverts the approach by moving the image sensor in the opposite direction. This allows precise control of the lighter image sensor while maintaining OIS functionality, effectively solving the control difficulty caused by heavy lens modules.
Solution Approach 2:
The patent introduces a counterweight mechanism where the image sensor movement counteracts the optical displacement caused by lens module weight. By moving the image sensor in the opposite direction, the system achieves OIS without being constrained by the lens module's weight.
2Length of moving object
If the actuator height is reduced to improve device compactness, then portability is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The patent redirects heat dissipation from the vertical dimension to the horizontal dimension by extending the heat dissipation structure laterally. This allows the actuator height to be reduced while maintaining effective heat dissipation through increased surface area in another dimension.
Solution Approach 2:
The patent applies localized heat dissipation structures specifically at the image sensor and actuator regions where heat is generated. By concentrating heat dissipation capabilities at critical hot spots rather than uniformly distributing them, the system achieves effective thermal management in a compact form factor.
3Measurement precision
If the movable frame rigidity is increased to improve OIS precision, then stabilization precision is improved, but device complexity increases
Solution Approach 1:
The patent employs composite material construction for the movable frame, combining materials with different properties to achieve high rigidity. This allows the frame to maintain structural stiffness for precise OIS control without requiring overly complex structural designs, as the material composition itself provides the necessary mechanical properties.
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 solution enables precise OIS performance by reducing the height of the actuator, enhancing rigidity, and efficiently dissipating heat, thereby improving the reliability and efficiency of camera modules in portable electronic devices.
Implementation Method 1
a coil disposed on the fixed frame... configured to generate electromagnetic force
Implementation Method 2
a magnet disposed on the movable frame... configured to generate electromagnetic force
Implementation Method 3
A ball member configured to guide movement of the movable frame may be disposed between the movable frame and the fixed frame
Implementation Method 4
the reinforcing plate includes a bent portion bent toward the sensor substrate... higher thermal conductivity
Data Source
AI summary
An actuator includes a fixed frame, a movable frame accommodated in the fixed frame and moving linearly and rotationally on a plane perpendicular to an optical axis, a driving unit disposed in the fixed frame and the movable frame to provide driving force for moving the movable frame; a sensor substrate including a movable portion coupled to the movable frame to move together with the movable frame, and a fixed portion coupled to the fixed frame; and an image sensor disposed on the sensor substrate. The movable frame includes a reinforcing plate made of a material different from a material of the movable frame, and the reinforcing plate includes a bent portion bent toward the sensor substrate.