Six-Lens Optical Imaging System with Aspherical Surfaces for Compact Telescopic Modules
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Solution Overview
Problem
Small camera modules in mobile devices face challenges in implementing telescopic and high-resolution optical imaging systems due to the limited number of lenses, making it difficult to achieve both characteristics simultaneously.
Innovation Solution
An optical imaging system comprising six lenses, with specific refractive powers and arrangements, including a first lens with positive refractive power, a second lens with negative refractive power, and a sixth lens with negative refractive power, along with aspherical surfaces and strategically placed air gaps, to achieve a wide field of view and high resolution while controlling aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the number of lenses is reduced to make the camera module thin, then the thickness of the camera module is reduced, but the telescopic characteristics and resolution are degraded
Solution Approach 1:
The patent applies parameter changes by using aspherical surfaces with specific conic constants (k values) for each lens element. The aspherical coefficients are precisely controlled (e.g., |k1|≤0.8, |k2|≤0.6, etc.) to optimize the optical path and correct aberrations, enabling high resolution with only six lenses in a thin configuration.
Solution Approach 2:
The patent employs aspherical surfaces instead of conventional spherical or flat surfaces for all six lens elements. The aspherical curvature is designed with specific conic constants to control light refraction and minimize optical aberrations, achieving both compact thickness and high imaging quality simultaneously.
2Length of moving object
If the number of lenses is reduced to make the camera module thin, then the thickness of the camera module is reduced, but the telescopic characteristics are degraded
Solution Approach 1:
The patent implements a telescopic structure where the second and third lenses can move relative to each other along the optical axis. This dynamic adjustment allows the focal length to be changed, providing telescopic functionality (zoom capability) while maintaining a compact form factor when in focus position.
Solution Approach 2:
The optical system is divided into six distinct lens elements with specific refractive powers arranged in sequence. The second and third lenses are designed as movable segments that can be positioned independently to achieve different focal lengths, enabling telescopic characteristics without increasing overall module thickness.
3Measurement precision
If aspherical surfaces with specific conic constants are used, then optical aberrations are reduced and resolution is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the aspherical conic constants (k values) of each lens surface. By controlling these parameters within defined ranges (e.g., |k1|≤0.8, |k2|≤0.6), the design achieves optimal optical performance while providing manufacturing guidelines that balance complexity and feasibility.
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 system achieves a field of view of 50° or greater and satisfies various conditional expressions for refractive indices and lens thicknesses, enabling high-performance imaging in small camera modules with improved telescopic and resolution characteristics.
Implementation Method 1
an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged in numerical order from an object side of the optical imaging system toward an imaging plane of the optical imaging system and each having a refractive power
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged in numerical order from an object side of the optical imaging system toward an imaging plane of the optical imaging system and each having a refractive power, wherein an entire field of view of the optical imaging system is 50° or greater, and TTL/f<1.0, where TTL is a distance from an object-side surface of the first lens to the imaging plane, and f is an overall focal length of the optical imaging system.