Three-Lens Imaging System with Optimized Power Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional three-lens imaging lens systems struggle to balance optical performance with size reduction and weight minimization, often resulting in excessive length and aberration issues due to power distribution and lens shape configurations.
Innovation Solution
A three-lens imaging lens system comprising a meniscus lens with positive power facing the object side, a diaphragm, and a biconcave lens with negative power, where specific focal length and curvature conditions are met to optimize focal distances, back focus, and telecentricity, ensuring excellent optical performance while reducing size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a three-lens lens system is used to achieve higher definition and higher resolution, then optical performance is improved, but the entire length of the lens system becomes too long
Solution Approach 1:
The patent applies parameter changes by optimizing the power distribution among the three lenses (first lens: positive power, second lens: negative power, third lens: positive power) and adjusting the center radius curvature of both surfaces of each lens. Specifically, the patent sets the power distribution ratios and curvature parameters to satisfy specific mathematical relationships, which enables the lens system to achieve high optical performance while reducing the back focus distance and overall length compared to conventional three-lens systems.
2Length of stationary object
If the back focus distance is shortened to reduce lens system length, then the entire length is reduced, but the third lens protrudes significantly towards the image surface side
Solution Approach 1:
The patent resolves this contradiction by changing the power distribution parameters and curvature parameters of the lenses. The second lens is designed with negative power and specific curvature relationships, which allows the back focus distance to be shortened without causing excessive protrusion of the third lens towards the image surface. The mathematical relationships between the radii of curvature and power distribution ensure that the lens surfaces are positioned optimally.
3Measurement precision
If a negative lens with convex surface facing object side is used, then aberration correction is achieved, but it becomes difficult to balance between aberration correction and size reduction
Solution Approach 1:
The patent applies parameter changes by optimizing the power distribution and curvature parameters of all three lenses. The second lens with negative power is designed with specific curvature relationships (where the object-side surface has a larger radius of curvature than the image-side surface), enabling effective aberration correction while maintaining a compact lens system size. The mathematical parameter relationships ensure that aberration correction performance is achieved without excessive lens system length.
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 a balance between optical performance, size reduction, and weight minimization, improving productivity and ensuring high telecentricity and back focus distance, while maintaining excellent optical properties.
Implementation Method 1
a first lens which is a meniscus lens having a positive power whose convex surface faces the object side
Implementation Method 2
a second lens which is a meniscus lens having a positive power whose convex surface faces the image surface side
Implementation Method 3
a third lens which is a biconcave lens having a negative power
Data Source
AI summary
It is to provide an imaging lens that maintains optical performance and achieves reduction in size and weight. The imaging lens comprises, in order from an object side towards an image surface side, a first lens which is a meniscus lens having a positive power whose convex surface faces the object side, a diaphragm, a second lens which is a meniscus lens having a positive power whose convex surface faces the image surface side, and a third lens which is a biconcave lens having a negative power, wherein the following conditions are to be satisfied; 1.3≧L/fl≧1, 0.8≧f1/fl≧0.6, 0.12≧f1/f2>0, −0.1≧f1/f3≧−0.25 (where, L: entire length of the lens system [distance from the surface of the object side of the first lens to the image taking surface [air reduced length]], fl: focal distance of the entire lens system, f1: focal distance of the first lens, f2: focal distance of the second lens, and f3: focal distance of the third lens).