Periscopic Camera Module with Light-Blocking Structures
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Solution Overview
Problem
Existing periscopic camera modules face challenges such as large size and complex structure, which occupy significant space in portable electronic devices, and struggle with stray light issues due to their optical path design.
Innovation Solution
The proposed periscopic camera module incorporates a first reflective element, an optical lens, a second reflective element, and a photosensitive chip, with at least one optical surface featuring a light-blocking structure to reduce volume, improve integration, and minimize stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a periscopic camera module uses a large focal length optical lens to achieve telephoto capability, then the optical zoom capability is improved, but the optical path length increases and the module volume becomes large
Solution Approach 1:
The patent introduces a first reflective element (mirror) to fold the optical path at a 45-degree angle, changing the linear optical path into a two-dimensional folded path. This allows the optical axis to be redirected perpendicular to the original direction, effectively reducing the longitudinal volume of the camera module while maintaining the required optical path length for telephoto capability
Solution Approach 2:
The patent employs multiple reflective elements nested within the optical path - the first reflective element folds the path longitudinally, and the second reflective element further folds it laterally. This nested folding approach packs a long optical path into a compact three-dimensional space, achieving both telephoto performance and small module volume
2Volume of moving object
If the periscopic camera module uses multiple reflective elements to fold the optical path, then the module volume is reduced, but stray light increases due to reflections from structural parts
Solution Approach 1:
The patent extracts and addresses the stray light problem by specifically adding light-blocking structures at the edge regions of optical surfaces where reflections occur. These light-blocking structures are positioned to intercept stray light before it can reflect off structural parts like the lens barrel edge, bracket edge, and reflective element edges, thereby removing the harmful effect while preserving the compact folded optical path design
3Volume of moving object
If the periscopic camera module uses a complex structure with multiple optical elements to achieve compact size, then the volume is reduced, but the assembly process becomes difficult and complex
Solution Approach 1:
The patent segments the optical system into distinct functional modules: the optical lens, the first reflective element, the second reflective element, and the photosensitive chip. Each component is designed and positioned independently with clear functional boundaries, which simplifies the assembly process by allowing each module to be assembled and tested separately before integration into the complete periscopic camera module
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 design reduces the volume of the camera module, enhances its compactness, improves imaging quality by reducing stray light, and simplifies the assembly process, making it suitable for mass production.
Implementation Method 1
a first reflective element, for reflecting incident light to turn it longitudinally
Implementation Method 2
the optical lens is for receiving light reflected by the first reflective element and outputting an imageable light beam
Implementation Method 3
the second reflective element includes at least one second reflective surface adapted for laterally turning the imageable light beam
Data Source
AI summary
A periscopic camera module, including: a first reflective element including a first reflective surface and used to reflect incident light and make the incident light longitudinally turn; an optical lens used to receive the light reflected by the first reflective element and output an imageable light beam to an image space; a second reflective element including at least one second reflective surface and adapted to make the imageable light beam transversely turn at least once; and a photosensitive chip adapted to receive the transversely turned imageable light beam, wherein at least one of all optical surfaces of the first reflective element and the second reflective element is provided with a light blocking structure, and the light blocking structure is arranged at an edge region of the at least one optical surface; and the optical surface includes a reflective surface, an incident surface, or an exit surface. The volume of the periscopic camera module can be reduced such that the structure of the periscopic camera module is more compact, and it can be better adapted to an optical lens with a large focal length, and can reduce or avoid the risk of introduction of stray light.