Eight-Lens Optical Imaging System for Compact High-Resolution Camera Modules
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Solution Overview
Problem
The increasing demand for high-resolution cameras in portable terminals poses a challenge due to the larger image sensor size, which results in a longer optical imaging system and a protruding camera, while also requiring a slim and compact design.
Innovation Solution
An optical imaging system comprising eight lenses, including a first lens with positive refractive power, a second lens with negative refractive power, and specific refractive indices and focal lengths for each lens, optimized to satisfy certain conditional expressions that ensure high resolution and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image sensor size is increased to achieve high resolution, then the resolution is improved, but the total length of the optical imaging system increases causing camera protrusion
Solution Approach 1:
The patent applies parameter changes by selecting specific refractive indices for each lens element (n1=1.52-1.60, n2=1.63-1.70, n3=1.54-1.62, etc.) and controlling focal length ratios (0.30<f1/|f2|<0.60, -0.40<f3/f4<0.10) to achieve compact design. These parameter optimizations enable the system to maintain high resolution with a reduced total length, directly resolving the contradiction between resolution and system length.
Solution Approach 2:
The optical imaging system is divided into eight distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each lens to contribute differently to the overall optical performance, enabling better control over light paths and reducing the total system length while maintaining high resolution imaging capability.
2Measurement precision
If the image sensor size is increased to achieve high resolution, then the resolution is improved, but the camera protrudes from the portable terminal
Solution Approach 1:
By optimizing the refractive indices and focal lengths of the eight lens elements, the patent achieves a compact optical system with reduced total length. This parameter optimization directly addresses the shape issue by minimizing camera protrusion while maintaining high resolution, as the compact design allows the camera module to be flush or near-flush with the terminal surface.
3Length of moving object
If the optical imaging system is made slim and compact, then the device size is reduced, but achieving high resolution becomes difficult
Solution Approach 1:
The patent achieves high resolution in a compact system by precisely controlling optical parameters: refractive indices (n1=1.52-1.60, n2=1.63-1.70, n3=1.54-1.62, n4=1.54-1.60, n5=1.63-1.70, n6=1.54-1.62, n7=1.52-1.60, n8=1.50-1.58) and focal length ratios (0.30<f1/|f2|<0.60, -0.40<f3/f4<0.10, -0.60<f5/f6<0.10, -0.10<f7/f8<1.50). These parameter constraints enable compact design while maintaining high resolution imaging performance.
Solution Approach 2:
The patent employs lens elements with different refractive index ranges, effectively using composite optical materials with varying optical properties. This allows the compact system to manipulate light paths efficiently, achieving high resolution despite the reduced total length by combining materials with complementary optical characteristics.
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 optical imaging system achieves high resolution and compactness, addressing the issue of camera protrusion while meeting the demands of slim and high-performance portable terminal cameras.
Implementation Method 1
an optical imaging system includes a first lens having positive refractive power, a second lens having negative refractive power, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens disposed in order from an object side
Data Source
AI summary
An optical imaging system includes a first lens having positive refractive power, a second lens having negative refractive power, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens disposed in order from an object side. A refractive index of the second lens is greater than a refractive index of each of the first lens and the third lens. The optical imaging system satisfies TTL/(2×IMG HT)<0.6 and 0<f1/f<1.4, where TTL is a distance on an optical axis from an object-side surface of the first lens to an imaging plane, IMG HT is half a diagonal length of the imaging plane, f is a total focal length of the optical imaging system, and f1 is a focal length of the first lens.