Camera Optical Lens With Folded Periscope Path
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Solution Overview
Problem
Traditional telephoto camera modules have an optical length that is too large, failing to meet the requirements for slim design in smartphones, and existing periscope-style telephoto camera modules do not achieve optimal optical performance.
Innovation Solution
A camera optical lens design comprising a first optical member with a reflective surface, specific refractive forces and curvature relationships, and an aspherical prism for image stabilization, allowing a large aperture periscope-style design with improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional telephoto camera module design is used, then telephoto imaging capability is achieved, but optical length becomes too large
Solution Approach 1:
The patent employs a periscope-style optical path folding design, where light travels horizontally through the lens assembly and then reflects at a 45-degree angle via a reflective surface to reach the image sensor. This dimensional change in light path routing reduces the optical length from the traditional longitudinal arrangement to a compact folded path, achieving both compact size and telephoto imaging capability
Solution Approach 2:
The patent integrates multiple optical components (lens groups, reflective surface, image sensor) into a nested compact structure where the light path is folded back on itself. The reflective surface is positioned at a 45-degree angle within the lens assembly, creating a nested optical path that reduces overall optical length while maintaining imaging functionality
2Length of moving object
If periscope-style telephoto camera module design is used, then optical length is reduced, but optical performance deteriorates
Solution Approach 1:
The patent applies local quality optimization by designing specific lens groups with tailored refractive indices and curvature radii. The first lens group has a positive refractive force with specific curvature relationships, while the second lens group has a negative refractive force, creating localized optical corrections that maintain high image quality despite the compact folded optical path
Solution Approach 2:
The patent optimizes optical performance by precisely controlling key parameters including the ratio of curvature radii (R1/R2 between -5 and -2), the refractive forces of different lens groups, and the positioning of the reflective surface. These parameter optimizations ensure that the folded optical path does not compromise image quality, maintaining sharp focus and minimal aberrations
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 compact, ultra-thin camera lens with enhanced optical performance and image stabilization, suitable for smartphones and other devices.
Implementation Method 1
The first optical member is provided with a reflective surface between an objective surface and an image surface
Implementation Method 2
a first optical member having a positive refractive force; a second lens having a negative refractive force
Data Source
AI summary
Disclosed is a camera optical lens, including a first optical member having a positive refractive force, a second lens having a negative refractive force, a third lens having a positive refractive force, a fourth lens having a negative refractive force, a fifth lens having a positive refractive force, and a sixth lens. An objective surface of the first optical member is curved, and an image surface of the first optical member is curved. The first optical member is provided with a reflective surface. A radius of curvature of the image surface of the first optical member is R2; an Abbe number of the first optical member is vd1, and a radius of curvature of the objective surface of the second lens is R3, and the following relationship expressions are satisfied: vd1≥60.00; 4.50≤R2/R3≤50.00. The camera optical lens can improve an aspherical prismatic lens, thereby realizing a large-aperture periscope-style design.