Nested OIS-AF Camera Module for Low-Light Blur Reduction
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Solution Overview
Problem
The size constraints of optical systems in electronic devices limit the numerical aperture, leading to increased shutter opening times and image blur in low-light conditions, which existing image stabilization systems struggle to adequately address.
Innovation Solution
An electronic device with a camera incorporating an optical image stabilization (OIS) system featuring a movable OIS housing, coils, and magnets arranged to stabilize images optically, allowing movement in multiple directions while maintaining alignment with the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the optical system size is increased to improve numerical aperture, then image quality in low-light conditions is improved, but device size and internal space requirements increase
Solution Approach 1:
The OIS housing is nested within the AF housing, which itself is nested within the base housing. This multi-level nesting arrangement allows the optical stabilization components to be compactly integrated without increasing the overall device volume, while still providing sufficient space for the optical system to achieve improved numerical aperture for better low-light performance
2Illumination intensity
If the optical system size is increased to improve numerical aperture, then image quality in low-light conditions is improved, but the device becomes less portable
Solution Approach 1:
The nested housing structure (OIS housing within AF housing within base housing) compactly integrates all optical components, maintaining a small form factor that preserves device portability while providing enough internal space for the optical system to achieve improved numerical aperture for low-light performance
3Reliability
If image stabilization system complexity is increased to reduce image blur, then image quality is improved, but device complexity increases
Solution Approach 1:
The OIS and AF systems are merged into a single integrated housing structure where the OIS housing is disposed within the AF housing. This combination allows both stabilization functions to work together efficiently, improving image quality while avoiding the complexity of completely separate systems
Solution Approach 2:
The AF housing serves multiple functions: it houses the OIS housing, provides structural support, and enables both optical image stabilization and autofocus operations. This multi-functionality reduces overall device complexity while maintaining effective image stabilization performance
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 OIS system effectively reduces image blur by stabilizing images optically, enhancing performance in low-light conditions without increasing device size.
Implementation Method 1
a coil circuit board at least partially disposed on a bottom surface of the AF housing and including a first coil and a second coil oriented with a magnetic axis facing a direction identical to that of the optical axis; and an optical image stabilization (OIS) housing in which the optical system is disposed and which is at least partially received in the AF housing, wherein the OIS housing includes a first magnet, facing the first coil, and a second magnet, facing the second coil, and is configured to be movable in a first direction, substantially perpendicular to the optical axis, and a second direction, substantially perpendicular to both of the optical axis and the first direction, by the first coil, the second coil, the first magnet, and the second magnet
Data Source
AI summary
There is provided an electronic device and camera thereof including: an optical system including an optical axis; an image sensor partially aligned with the optical axis; a base housing partially surrounding the image sensor; an autofocus (AF) housing partially arranged in the base housing and movable along the optical axis; a coil circuit board partially disposed on a bottom of the AF housing and including first and second coils with a magnetic axis along the optical axis; and an optical image stabilization (OIS) housing in which the optical system is disposed and at least partially received in the AF housing, the OIS housing includes a first and second magnets facing the first and second coils, and movable in a direction perpendicular to the optical axis and a second direction, perpendicular to the optical axis and the direction, by the first and second coils and the first and second magnets.