Variable Wedge Prism OIS Layout to Prevent AF Magnet Interference
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Solution Overview
Problem
Conventional image stabilization (OIS) technologies in camera modules face challenges with magnetic field interference between OIS and autofocus (AF) magnets, limiting the compactness and light gathering capability of camera modules.
Innovation Solution
An image stabilization device incorporating a coil part and a magnet part within an image stabilization control unit, which uses a variable wedge prism to control light paths, separating the OIS magnet from the AF magnet to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If OIS magnet and AF magnet are placed close together in a compact camera module, then the camera module size is reduced, but magnetic field interference occurs between the magnets
Solution Approach 1:
A magnetic shield is introduced as an intermediary component between the OIS magnet and the AF magnet. This magnetic shield blocks or redirects magnetic field lines, preventing direct magnetic field interference between the two magnets while allowing them to be positioned close together in the compact camera module structure.
Solution Approach 2:
The magnetic field space between the OIS magnet and AF magnet is segmented by introducing a magnetic shield that divides the magnetic field paths. This segmentation allows the magnetic fields of the two magnets to operate in separate zones, reducing interference while maintaining compact positioning.
2Illumination intensity
If the lens length is increased to secure light gathering capability, then light reception is improved, but the camera module becomes larger and more complex
Solution Approach 1:
The OIS function is integrated into the existing lens structure by incorporating the OIS magnet within or adjacent to the lens assembly. This merging allows the lens to perform both its primary imaging function and the OIS function simultaneously, improving light reception without proportionally increasing the camera module size.
Solution Approach 2:
The lens assembly is designed to serve multiple functions: primary image formation and optical image stabilization. By making the lens assembly universal, the system achieves improved light gathering capability through a longer effective optical path without requiring separate dedicated components that would increase overall size.
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
This configuration effectively inhibits magnetic field interference between OIS and AF magnets, enabling a more compact and efficient camera module design with improved light management.
Implementation Method 1
an image stabilization control unit (72) including a coil part (72C) and a magnet part (72M) for controlling a shape of the second wedge prism (71b)
Implementation Method 2
a first wedge prism (71a) for changing a path of light beams; a second wedge prism (71b) disposed under the first wedge prism (71a) and changing a path of light emitted from the first wedge prism (71a)
Data Source
AI summary
The embodiment relates to an image stabilization device and a camera module including the same.The image stabilization device according to the embodiment includes: a first prism for changing a path of a light beam; a second prism disposed below the first prism and changing a path of light beam emitted from the first prism; an image stabilization control unit for controlling a shape of the second prism including a coil part and a magnet part.The first prism may be disposed inside the image stabilization control unit. The second prism may be a variable wedge prism. The image stabilization control unit may control the path of the light beam by changing the shape of the second prism through the magnet part.