Seven-Lens Optical Imaging Design for Compact High-Resolution Terminals
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Solution Overview
Problem
There is a demand for optical imaging systems in portable terminals that achieve high resolution while maintaining a reduced size, which existing technologies have not adequately addressed.
Innovation Solution
An optical imaging system comprising seven lenses, including specific refractive power, focal length, and shape configurations that satisfy certain conditional expressions, such as TTL/(2×IMG HT)<0.6 and −0.1<SAG42/TTL<0, to achieve high resolution and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to achieve high resolution, then image quality is improved, but the overall size of the optical imaging system increases
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the refractive powers, focal lengths, and spacing of each lens element. The conditional expressions (e.g., TTL/(2×IMG HT) < 0.6, −0.1 < SAG42/TTL < 0) define specific parameter ranges that enable high resolution with a compact form factor. This systematic parameter optimization allows the seven-lens system to achieve superior image quality while maintaining a reduced overall size compared to conventional designs.
2Length of moving object
If the focal length is reduced to minimize the size of portable terminals, then device compactness is improved, but optical performance and aberration control deteriorate
Solution Approach 1:
The patent segments the optical system into seven distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to be optimized for specific functions: some elements focus on reducing aberrations while others contribute to the overall compact focal length. The divided structure enables independent optimization of each lens element, maintaining high optical performance despite the reduced total focal length required for portable device integration.
Solution Approach 2:
The patent employs parameter changes by establishing specific conditional expressions that define the relationship between various optical parameters. Expressions such as −0.1 < SAG42/TTL < 0 and TTL/(2×IMG HT) < 0.6 constrain the design space to ensure that even with a reduced focal length, the optical performance remains high and aberrations are effectively controlled. This mathematical parameter optimization bridges the gap between compact size and optical quality.
3Reliability
If complex lens configurations are used to control aberrations, then optical performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by defining specific conditional expressions that guide the design of each lens element. Rather than using overly complex freeform surfaces or exotic materials, the patent optimizes conventional lens parameters (refractive power, focal length, spacing) within defined ranges. This approach achieves superior aberration control while maintaining compatibility with standard manufacturing processes, making the complex optical performance achievable through parameter optimization rather than manufacturing complexity.
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 high resolution and reduced size, with improved optical performance and aberration control, enabling enhanced image quality in portable devices.
Implementation Method 1
An optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens disposed in order from an object side to an imaging side, wherein the first lens has positive refractive power, and the second lens has negative refractive power
Data Source
AI summary
An optical imaging system is provided. The optical imaging system includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens disposed in order from an object side to an imaging side. The first lens has positive refractive power, and the second lens has negative refractive power, and TTL/(2×IMG HT)<0.6 and −0.1<SAG42/TTL<0 are satisfied, where TTL is a distance from an object-side surface of the first lens to an imaging plane on an optical axis, IMG HT is equal to half a diagonal length of the imaging plane, and SAG42 is a SAG value at an end of an effective aperture of an image-side surface of the fourth lens.