Six-Lens Camera Module for Compact High-Resolution Imaging
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Solution Overview
Problem
The challenge is to develop a lens module for portable terminals that achieves high resolution and low weight while maintaining low cost and brightness, particularly with reduced pixel sizes and increased miniaturization of camera components.
Innovation Solution
The lens module consists of six lenses with specific refractive powers and shapes, including aspherical surfaces, and incorporates irises for vignetting, satisfying conditional expressions for optimal performance, including TTL/IMGH < 2.0, 0.7 < SL/TTL < 1.1, ANG/F no. > 33, F no. < 2.3, and 6 < ANG/(F no.*TTL) < 11, to enhance aberration correction and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the pixel size of the imaging device is reduced to achieve miniaturization, then the size and weight of the camera are reduced, but the resolution and image quality deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and spacing of each lens element in the six-lens optical system. By carefully adjusting these parameters, the design achieves high resolution with reduced pixel sizes (1.12 μm or smaller), resolving the contradiction between miniaturization and image quality
Solution Approach 2:
The patent uses composite lens structures combining multiple lens materials with different refractive indices and Abbe numbers. This allows the optical system to correct chromatic and spherical aberrations effectively, maintaining high resolution despite reduced pixel size and compact form factor
2Manufacturing precision
If the number of lenses is increased to improve aberration correction, then the image quality improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent segments the optical system into six distinct lens elements, each with specific refractive power and shape characteristics. This segmentation allows effective aberration correction while maintaining manageable complexity through systematic design of each element's parameters
Solution Approach 2:
The patent employs aspherical surfaces on selected lens elements to correct spherical aberration and other monochromatic aberrations. The aspherical shapes provide superior aberration correction compared to spherical surfaces, achieving high manufacturing precision without requiring an excessive number of lens elements
3Illumination intensity
If the F number is reduced to increase brightness, then the light gathering capability improves, but the depth of field control and aberration correction become more difficult
Solution Approach 1:
The patent achieves low F number (high brightness) by optimizing the aperture size relative to the focal length and adjusting the refractive powers and spacing of lens elements. The conditional expressions define specific parameter ranges that enable bright imaging while maintaining aberration correction
Solution Approach 2:
The patent uses lens materials with specific refractive indices and Abbe numbers to correct chromatic and spherical aberrations in the low F number optical system. The composite lens structure with carefully selected materials enables brightness improvement without sacrificing aberration correction quality
4Volume of moving object
If the TTL/IMGH ratio is reduced to achieve compact design, then the overall size is reduced, but the field of view and imaging performance may be compromised
Solution Approach 1:
The patent reduces the TTL/IMGH ratio by optimizing the total track length and image height parameters while maintaining adequate field of view. The conditional expression TTL/IMGH < 2.0 defines the compact design range, achieved through careful parameter adjustment of lens elements and spacing
Solution Approach 2:
The patent achieves compact design by optimizing the dimensional relationships between lens elements in multiple directions. The conditional expressions define specific dimensional ratios that enable reduced volume while maintaining imaging performance through balanced dimensional optimization
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 improves aberration correction, achieves high resolution, reduces weight, and lowers manufacturing costs, enabling clear imaging even in low light conditions with a compact design.
Implementation Method 1
a first lens having positive refractive power; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having refractive power; a fifth lens having positive refractive power; and a sixth lens having refractive power
Data Source
AI summary
There is provided a lens module including: a first lens having positive refractive power; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having refractive power; a fifth lens having positive refractive power; and a sixth lens having refractive power and a shape in which an image side surface thereof is concave toward an image side.