Seven-Lens Optical System for Compact Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical systems struggle to achieve both a miniaturized design and a large image plane characteristic, which is essential for enhancing user experience in electronic devices.
Innovation Solution
The optical system comprises a series of lenses with specific refractive powers and surface shapes, including a first lens with positive refractive power, a second lens with negative refractive power, and additional lenses to correct chromatic aberration and astigmatism, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the optical system is miniaturized by reducing total length, then the total optical length decreases, but the image plane size becomes smaller
Solution Approach 1:
The optical system is divided into seven distinct lens groups with alternating positive and negative refractive powers. Each lens group performs specific optical functions (convergence, divergence, aberration correction), allowing the system to maintain compact overall length while achieving adequate image plane size through distributed optical power management.
Solution Approach 2:
The patent employs precise control of refractive power parameters across the seven lens groups, with specific focal length relationships (e.g., f1>0, f2<0, f3>0, f4<0, f5>0, f6>0, f7<0) and surface curvature parameters (convex/concave configurations) to optimize the TTL/ImgH ratio. This parameter optimization enables simultaneous achievement of miniaturization and adequate image plane characteristics.
2Length of moving object
If lenses with high refractive power are used to shorten total length, then the total optical length decreases, but the optical system sensitivity increases
Solution Approach 1:
Instead of using a single high-power lens, the optical power is segmented across seven lens groups with alternating signs. This distribution prevents any single lens from having excessive refractive power, thereby reducing sensitivity to manufacturing tolerances and alignment errors while still achieving short total length.
Solution Approach 2:
The patent specifies controlled ranges for refractive power parameters (f1, f2, f3, f4, f5, f6, f7) and their relationships, along with surface curvature parameters (R1, R2, R3, R4, R5, R6, R7). These parameter constraints ensure that no single lens becomes overly sensitive while maintaining the compact form factor.
3Measurement precision
If the image plane size is increased to capture more details, then the imaging quality improves, but the total optical length increases
Solution Approach 1:
The patent optimizes the ratio TTL/ImgH to fall within a specific range (0.6 < TTL/ImgH ≤ 1.12), which directly addresses the trade-off between total length and image plane size. This parameter control enables adequate imaging quality with captured details while maintaining miniaturized dimensions.
Solution Approach 2:
Each lens group serves multiple functions: the positive power lenses (L1, L3, L5, L6) provide convergence and contribute to image formation, while the negative power lenses (L2, L4, L7) provide divergence and correct aberrations. This multi-functionality allows the compact system to achieve both small size and good imaging quality.
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 allows for a reasonable ratio of total optical length to half-image height, enabling a miniaturized design with improved imaging quality and the ability to capture more details, thus enhancing user experience.
Implementation Method 1
a first lens having a positive refractive power, an object side surface of the first lens being convex near the optical axis, and an image side surface of the first lens being concave near the optical axis
Implementation Method 2
a second lens having a negative refractive power, an object side surface of the second lens being convex near the optical axis, and an image side surface of the second lens being concave near the optical axis, which is beneficial to suppress the generation of the axial chromatic aberration
Implementation Method 3
The fourth lens has a negative refractive power, which is beneficial to correct the chromatic aberration of magnification
Implementation Method 4
The sixth lens has a positive refractive power, and can correct astigmatism well
Implementation Method 5
The seventh lens has a negative refractive power. The object side surface of the seventh lens is convex near the optical axis, and the image side surface thereof is concave near the optical axis, which can well correct the curvature of the image plane
Data Source
AI summary
The optical system includes, a first lens having a positive refractive power, an object side surface thereof being convex near an optical axis, and an image side surface thereof being concave near the optical axis; a second lens having a negative refractive power, an object side surface thereof being convex near the optical axis, and an image side surface thereof being concave near the optical axis; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a refractive power; a sixth lens having a positive refractive power, an object side surface thereof being convex near the optical axis; a seventh lens having a negative refractive power, an object side surface thereof being convex near the optical axis, and an image side surface thereof being concave near the optical axis; the optical system satisfies the following condition:1≤TTL/ImgH≤1.12.