Camera Module Actuator Segmentation for Autofocus and OIS
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Camera modules face challenges in implementing both autofocus (AF) and optical image stabilization (OIS) functions efficiently, especially when the diameter of the imaging lens increases, leading to higher weights and the need for larger actuators, which complicates the mechanical design and increases power consumption due to the influence of springiness in energizing sections.
Innovation Solution
A camera module design where the imaging lens and image sensor are supported to move in different directions, utilizing separate actuators for AF and OIS operations, with electromagnetic drives and elastic body support to minimize friction and power requirements, and employing bonding wires or flexible printed boards to reduce springiness effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the diameter of the imaging lens is increased to accommodate more pixels, then the image quality and resolution are improved, but the weight of the imaging lens increases, making it difficult for the actuator to drive both AF and OIS functions
Solution Approach 1:
The patent divides the actuator system into separate AF actuator and OIS actuator, each responsible for specific functions. The OIS actuator only needs to drive the imaging lens for stabilization, while the AF actuator handles focusing, reducing the burden on each individual actuator despite the increased lens weight
Solution Approach 2:
The imaging lens is designed to serve multiple functions: it is driven by the OIS actuator for optical image stabilization and by the AF actuator for autofocus. This multi-functional design allows the system to handle both stabilization and focusing requirements with a single lens structure
2Use of energy by moving object
If the weight of the imaging lens is increased, then the image sensor can capture more light and detail, but the force required to drive the lens for OIS operation becomes excessively large
Solution Approach 1:
The patent separates the OIS actuator from the AF actuator, so the OIS actuator only needs to provide enough force for stabilization movements, which are smaller and require less force than full autofocus range movements. This segmentation reduces the peak force requirements
Solution Approach 2:
The patent introduces a suspension wire that supports the imaging lens from above, counterbalancing part of its weight. This reduces the net force that the OIS actuator must overcome, making it easier to drive the heavier lens for stabilization
3Measurement precision
If a suspension wire is used to support the imaging lens for OIS operation, then the lens can be positioned accurately, but the reaction force of the suspension wire increases, requiring larger driving force
Solution Approach 1:
The patent separates OIS and AF functions into different actuators, allowing the OIS actuator to work with the suspension wire for precise stabilization without needing to overcome the full reaction force during large autofocus movements, as the AF actuator handles those
4Object-affected harmful factors
If bonding wires are used to connect the image sensor, then the springiness effect is reduced, but the complexity of the energizing section increases
Solution Approach 1:
The patent replaces traditional flexible printed circuit board (FPC) connections with bonding wires to connect the image sensor. Bonding wires have minimal springiness compared to FPC, reducing the harmful elastic effects while the overall system complexity is managed through the modular actuator design
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
Enables efficient operation of both AF and OIS functions with improved accuracy and reduced power consumption, even with larger imaging lenses, by optimizing actuator design and minimizing the impact of springiness in the camera module.
Implementation Method 1
at least one of the actuators may have an electromagnetic drive section
Implementation Method 2
Both of the respective actuators may support a movable part by an elastic body
Data Source
AI summary
Disclosed is a camera module including an imaging lens supported in such a manner as to be displaceable in a first direction, an image sensor supported in such a manner as to be displaceable in a second direction different from the first direction, a first actuator that carries out positioning of the imaging lens in the first direction, and a second actuator that carries out positioning of the image sensor in the second direction. Autofocus operation is carried out by one of the first actuator, and the second actuator and optical image stabilization operation is carried out by the other of the first actuator and the second actuator.