Camera Module Light Folding With Integrated Stray Light Shielding
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Solution Overview
Problem
Conventional telephoto optical systems face challenges in achieving both high image quality and compactness due to issues with stray light and size, with additional components to block stray light often increasing the overall system size, making them unsuitable for modern electronic devices.
Innovation Solution
A camera module design incorporating light-folding elements with light-shielding mechanisms that fold imaging light through a compact optical path, using conditions such as 0.14<ϕmax/BFL<0.42 and 15 [mm]<EFL<40 [mm] to ensure high resolving power and compactness, along with light-shielding mechanisms to block stray light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional optical components are added to block stray light, then imaging quality is improved, but overall system size increases
Solution Approach 1:
The patent combines the light-shielding function with the existing optical components by configuring the light-shielding mechanisms to be integrated into the optical path structure. The light-shielding mechanisms are positioned to block stray light without requiring separate additional components, thus improving imaging quality while avoiding increased system size.
Solution Approach 2:
The patent uses light-folding elements to change the spatial dimension of the optical path, folding the light path within the existing system volume. This allows the optical system to achieve the required light path length and implement effective stray light blocking without increasing the overall system size in any single dimension.
2Volume of stationary object
If optical system is made compact, then system size is reduced, but stray light blocking becomes difficult
Solution Approach 1:
The patent employs movable light-shielding mechanisms that can dynamically adjust their positions to optimize stray light blocking for different imaging conditions. This dynamic adjustment capability allows the compact system to effectively block stray light without requiring a larger fixed structure.
Solution Approach 2:
The light-folding elements act as intermediaries that redirect imaging light through a folded optical path while the light-shielding mechanisms block stray light at strategic points. This intermediary approach allows effective stray light management in a compact configuration by controlling light paths without expanding system volume.
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 design achieves a miniaturized optical system with high resolving power and effective stray light blocking, meeting the requirements of modern electronic devices for compact size and high image quality.
Implementation Method 1
Each of the light-folding elements has an entrance optical path and an exit optical path and is configured to fold the imaging light from the entrance optical path thereof to the exit optical path thereof
Implementation Method 2
At least one light-shielding mechanism is arranged on at least one of the entrance light path and the exit light path of the at least one image-side light-folding element. The at least one light-shielding mechanism has a minimal opening, and the minimal opening surrounds the imaging light
Implementation Method 3
The imaging lens system is configured to focus imaging light onto an image surface
Data Source
AI summary
A camera module includes an imaging lens system, an image sensor and a plurality of light-folding elements. The imaging lens system is configured to focus imaging light onto an image surface. The image sensor is disposed on the image surface. The plurality of light-folding elements includes at least one image-side light-folding element disposed on an image side of the imaging lens system, and each of the light-folding elements is configured to fold the imaging light from an entrance optical path thereof to an exit optical path thereof. At least one light-shielding mechanism is arranged on at least one of the entrance light path and the exit light path of the at least one image-side light-folding element. The at least one light-shielding mechanism has a minimal opening, and the minimal opening surrounds the imaging light in the at least one of the entrance optical path and the exit optical path.