OIS Actuator Base Structure for Heat Dissipation and Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing camera modules face challenges in efficiently dissipating heat generated by the image sensor and printed circuit board due to slower convection or radiation, leading to potential image distortion and sensor defects, while also being susceptible to component impact and misalignment during optical image stabilization.
Innovation Solution
An actuator for optical image stabilization is designed with a movable frame and a base comprising plates of differing thermal conductivity, a heat transmission member, and a heat dissipation film, along with a buffer member to absorb impacts, ensuring effective heat dissipation and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the image sensor is spaced apart from the set component to enable movement, then the optical image stabilization function is achieved, but the heat dissipation efficiency deteriorates
Solution Approach 1:
A base structure is introduced as an intermediary component between the image sensor and the set component. This base includes a first plate with high thermal conductivity material that directly contacts the image sensor, and a second plate with lower thermal conductivity that contacts the set component. This intermediary base structure enables the image sensor to be spaced apart for movement while providing an efficient thermal conduction path to dissipate heat.
Solution Approach 2:
The base structure employs different thermal conductivity materials in different regions: the first plate uses high thermal conductivity material near the image sensor to efficiently conduct heat away from the sensor, while the second plate uses lower thermal conductivity material near the set component. This local differentiation of material properties optimizes both heat dissipation and the mechanical spacing required for image sensor movement.
2Reliability
If the image sensor is moved for optical image stabilization, then the correction performance is improved, but the risk of component impact and misalignment increases
Solution Approach 1:
A buffer member is introduced as a protective element between the movable frame and other components. This buffer member is positioned to absorb and dissipate impact forces before they can cause damage to the image sensor or other sensitive components, thereby enabling the movement function while protecting against the harmful effects of impact and misalignment.
3Ease of manufacture
If the base is designed with uniform material structure, then the manufacturing is simplified, but the heat dissipation performance deteriorates
Solution Approach 1:
The base structure is divided into multiple plates with different thermal conductivity properties. The first plate uses high thermal conductivity material to efficiently conduct heat from the image sensor, while the second plate uses lower thermal conductivity material to provide structural support and interface with the set component. This local differentiation of material properties optimizes heat dissipation performance while maintaining manufacturability through modular plate construction.
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 enhances heat dissipation and reduces the risk of component misalignment and impact, improving the performance and reliability of optical image stabilization in camera modules.
Implementation Method 1
The first plate may be formed of a material having a higher thermal conductivity than a thermal conductivity of the second plate
Implementation Method 2
heat generated by the image sensor and the PCB connected to the image sensor is radiated through convection or radiation
Implementation Method 3
heat generated by the image sensor and the PCB connected to the image sensor is radiated through convection or radiation
Implementation Method 4
an impact may occur between components of various camera modules. Since various camera components may fall off due to the impact between the components
Data Source
AI summary
An actuator for optical image stabilization includes: a fixed frame defining an internal space; a movable frame accommodated in the fixed frame and movable relative to the fixed frame; a first driver to provide driving force to the movable frame; a sensor substrate including a moving portion coupled to the movable frame and movable with the movable frame; an image sensor disposed in the sensor substrate and including an imaging surface oriented toward a first direction; and a base spaced apart from the image sensor. The base includes a first plate facing the image sensor and a second plate surrounding an external periphery of the first plate, and the first plate and the second plate are formed of different materials.