Camera Module Actuator Layout for Thin Lens Driving and Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of integrating slim camera modules with autofocus, image stabilization, and zoom functions in portable electronic devices is compounded by the need for thin components that maintain effective electromagnetic interactions for precise lens movement and stabilization.
Innovation Solution
A camera module actuator design featuring a first coil and magnet arrangement with non-overlapping sensors and magnets, separated by distinct gaps, and yokes to support these components, allowing for thin profile while maintaining driving force and stabilization capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the camera module components are made thin to achieve a slim profile, then the overall module thickness is reduced, but the electromagnetic interaction effectiveness between coils and magnets deteriorates
Solution Approach 1:
The camera module is divided into separate functional layers: a first substrate containing the first coil, a second substrate containing the first sensor, and magnets positioned at specific gaps relative to each substrate. This segmentation allows each component to be optimized independently while maintaining overall thinness.
Solution Approach 2:
Different gap distances are used in different locations: the first gap between the first substrate and first magnet is optimized for driving force, while the second gap between the second substrate and first magnet is optimized for sensor performance. This local optimization maintains electromagnetic effectiveness despite reduced overall thickness.
2Force
If the first sensor is positioned to overlap the first coil, then the electromagnetic interaction is maximized, but the sensor measurement precision deteriorates due to electromagnetic interference
Solution Approach 1:
The first sensor is extracted from the first substrate and placed on a separate second substrate, physically removing it from the high electromagnetic interference zone of the first coil while maintaining proximity for functional interaction through the magnet.
Solution Approach 2:
The first magnet acts as an intermediary between the first coil and the first sensor, allowing the sensor to detect magnetic field changes caused by coil activation without being directly exposed to electromagnetic interference from the coil itself.
3Length of moving object
If the first magnet and second magnet are positioned close together to reduce thickness, then the module becomes thinner, but the magnetic field interference between magnets increases
Solution Approach 1:
Different gap distances are implemented: the first gap (substrate to first magnet) and second gap (sensor substrate to first magnet) are optimized independently. This allows thin overall design while maintaining appropriate spacing to minimize magnetic interference between components.
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 and precise lens movement and stabilization in thin camera modules without increasing driving voltage, ensuring effective autofocus and image stabilization in portable devices.
Implementation Method 1
a first coil disposed on a first substrate in a first direction, a first sensor, a first magnet facing the first coil in a second direction
Implementation Method 2
a first sensor, a first magnet facing the first coil in a second direction
Data Source
AI summary
An apparatus including a camera module actuator that includes a first coil disposed on a first substrate in a first direction, a first sensor, a first magnet facing the first coil in a second direction, and a second magnet facing the first substrate and the first sensor in the second direction, where the first sensor is disposed without overlapping the first coil in the second direction, the first magnet and the second magnet are separated from each other, and a second gap between the first substrate and the second magnet is greater in the second direction than a first gap between the first substrate and the first magnet in the second direction.