Compact Imaging Lens Design with Negative Meniscus and Positive Groups
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Solution Overview
Problem
There is a demand for an imaging lens that is compact, lightweight, and maintains favorable optical performance, which existing lens systems have not adequately addressed.
Innovation Solution
The imaging lens is designed with a configuration consisting of a first lens group with a negative meniscus lens and a negative lens, followed by a second lens group with a positive refractive power, satisfying specific conditional expressions to achieve reduction in size and weight while maintaining optical performance. This configuration includes cemented lenses and specific refractive index and Abbe number conditions to correct chromatic aberrations and astigmatism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional lens systems are used, then optical performance can be maintained, but the lens size and weight increase
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the refractive indices (Nd1, Nd2, Nd3, Nd4) and Abbe numbers (vd1, vd2, vd3, vd4) of the lens materials, along with the conditional expressions involving focal lengths (fG1, fG2) and curvature radii (r1, r2, r3, r4). These parameter optimizations enable the lens to achieve compact size and reduced weight while maintaining favorable optical performance through precise control of light refraction and aberration correction.
2Ease of manufacture
If lens configuration is simplified to reduce size, then manufacturing becomes easier, but optical performance deteriorates
Solution Approach 1:
The patent employs composite material principles by combining multiple lens elements with different optical properties (positive and negative lenses with specific refractive indices and Abbe numbers) into a unified lens system. The cemented lens structure integrates different glass materials to correct chromatic aberrations while maintaining a compact form factor that is feasible for manufacturing.
3Reliability
If more lens elements are added to improve optical performance, then image quality increases, but device complexity increases
Solution Approach 1:
The patent applies merging principles by combining multiple lens elements into two compact lens groups (first lens group G1 with positive refractive power and second lens group G2 with negative refractive power). This grouping strategy integrates the functions of multiple individual lenses while maintaining a streamlined structure that avoids excessive complexity in the overall lens configuration.
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 solution enables the creation of an imaging lens that is both compact and lightweight while maintaining excellent optical performance, effectively addressing the demand for reduced size and weight while ensuring high image quality.
Implementation Method 1
a first lens group G1 that has a positive refractive power; an aperture stop St; and a second lens group G2 that has a negative refractive power
Data Source
AI summary
The imaging lens consists of, in order from an object side to an image side, a first lens group that has a refractive power, a stop, and a second lens group that has a positive refractive power. The first lens group includes, successively in order from a position closest to the object side to the image side, a negative meniscus lens and a negative lens. A conditional expression relating to a back focal length Bf, a focal length f of the imaging lens, and a maximum half angle of view ω: 0.3<Bf/(f×tan ω)<1.75 is satisfied.