Seven-Lens Imaging System for Compact Camera Modules
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Solution Overview
Problem
Compact camera modules mounted on wireless terminals face challenges in achieving high performance due to limited space, making it difficult to develop imaging lens systems that can enhance image quality without increasing the camera's size.
Innovation Solution
The proposed imaging lens system consists of seven lenses with specific refractive powers and surface configurations, including aspherical surfaces, arranged to satisfy certain conditional expressions that optimize focal length, distance relationships, and refractive indices, allowing for improved performance within the compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to improve imaging performance, then aberration correction and image quality are improved, but the overall length and volume of the lens system increase
Solution Approach 1:
The patent employs a nested lens configuration where the second, third, fourth, fifth, and sixth lenses are arranged in a compact sequence between the first and seventh lenses. This nested arrangement allows multiple optical elements to be packed efficiently within a constrained axial space, achieving superior aberration correction without proportionally increasing the overall lens length
Solution Approach 2:
The patent utilizes aspherical surfaces on multiple lenses (first, second, third, fourth, fifth, and sixth lenses) to change the geometric parameters of the optical elements. This parameter change enables more precise control of light paths and aberrations within a compact form factor, improving imaging performance without requiring additional lens elements that would increase length
2Length of stationary object
If the focal length is decreased to reduce camera module size, then compactness is improved, but imaging performance and aberration correction become more difficult to achieve
Solution Approach 1:
The patent applies aspherical surfaces to six out of seven lenses in the system. This curvature variation from simple spherical shapes enables precise control of light rays throughout the compact optical path, achieving effective aberration correction despite the short focal length and compact module size
Solution Approach 2:
The patent specifies different refractive indices for each lens element (ranging from approximately 1.46 to 1.75) and uses combinations of positive and negative refractive powers. This composite optical design allows the compact lens system to achieve balanced aberration correction across multiple wavelengths and field angles, maintaining high imaging performance in a small form factor
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 configuration enhances the imaging performance of compact cameras by optimizing aberration correction and light transmission, achieving better image quality while maintaining a compact size.
Implementation Method 1
an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed from an object side
Data Source
AI summary
An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed from an object side. The system satisfies TTL/f<1.0 and D23/D34<1.2, where TTL is a distance from an object-side surface of the first lens to an imaging plane, f is a focal length of the imaging lens system, D23 is a distance from an image-side surface of the second lens to an object-side surface of the third lens, and D34 is a distance from an image-side surface of the third lens to an object-side surface of the fourth lens.