Periscope Camera Module With Decoupled OIS for Space-Limited Telephoto
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Solution Overview
Problem
The challenge of capturing distant objects clearly with mobile phone cameras is hindered by the thickness constraints of vertical telephoto lenses, and image blurring due to external vibrations affects image quality during shooting.
Innovation Solution
A periscope camera module with a two-stage image stabilization mechanism, comprising a first image stabilization component that rotates an optical path steering element around a first axis and a second component that moves an imaging element along the first axis, decoupling movements to achieve large stabilization angles without introducing image rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a periscope telephoto module uses an optical path steering element to fold light, then the focal length can be bent and the lens module thickness is reduced, but the module space is limited and image stabilization becomes difficult
Solution Approach 1:
The patent divides the image stabilization function into two independent stages: a first image stabilization component that rotates the optical path steering element around a first axis, and a second image stabilization component that moves the imaging element along the first axis. This segmentation allows each component to perform stabilization in its own designated space, effectively utilizing the limited module volume while maintaining stabilization capability.
Solution Approach 2:
The patent transitions from traditional single-axis stabilization to a two-stage stabilization mechanism that operates in different dimensional spaces. The first component rotates around a first axis (angular movement), while the second component translates along the first axis (linear movement). This dimensional separation allows both stabilization functions to coexist within the constrained periscope module space without interfering with each other.
2Adaptability or versatility
If the optical path steering element is driven to move in two axes, then image stabilization coverage is increased, but image rotation is introduced and control complexity increases
Solution Approach 1:
The patent segments the stabilization control into two independent stages with distinct functions. The first image stabilization component handles rotation around the first axis, while the second image stabilization component handles translation along the first axis. This segmentation decouples the control logic, allowing each component to be controlled independently without introducing image rotation or increasing overall system complexity.
Solution Approach 2:
The patent extracts the image rotation function from the stabilization mechanism by preventing the optical path steering element from moving in two axes. Instead, only rotation around the first axis is permitted, and the translation function is assigned to a separate second component. This extraction eliminates the source of image rotation while maintaining comprehensive stabilization coverage through the coordinated action of both components.
3Reliability
If a large image stabilization angle is achieved through translation, then stabilization effectiveness is improved, but the translation distance required becomes large and module space is consumed
Solution Approach 1:
The patent introduces dynamic stabilization by allowing the optical path steering element to rotate around the first axis, providing angular adjustment capability. This rotational degree of freedom enables large stabilization angles to be achieved through rotation rather than translation, significantly reducing the required translation distance while maintaining stabilization effectiveness within the constrained module space.
Solution Approach 2:
The patent resolves the contradiction between stabilization effectiveness and translation distance by adding rotational movement as a new degree of freedom. The first image stabilization component rotates the optical path steering element around the first axis, converting linear translation requirements into angular rotation. This dimensional change allows large stabilization angles to be achieved with minimal translation, preserving module space for other 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
This approach ensures effective image stabilization within limited space, maintaining image quality by decoupling axis movements and avoiding image rotation, thus enhancing the camera's ability to capture distant objects.
Implementation Method 1
uses an optical path steering element (for example, a prism) to fold light into an imaging element
Implementation Method 2
drive the optical path steering element to rotate around the first axis
Implementation Method 3
drive the imaging element to move in an extension direction of the first axis
Data Source
AI summary
A periscope camera module includes an optical path steering element, a lens group, an imaging element, a first image stabilization component, and a second image stabilization component. The optical path steering element is configured to perform angle folding on incident light, and then perform imaging on the imaging element through the lens group. The first image stabilization component is connected to the optical path steering element, and is configured to drive the optical path steering element to rotate around the first axis, where the first axis is perpendicular to a plane formed by an input optical axis and an output optical axis of the optical path steering element. The second image stabilization component is flexibly connected to the imaging element, and is configured to drive the imaging element to move in an extension direction of the first axis.