Three-Lens Imaging Assembly with Constant Aperture Diaphragm
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Solution Overview
Problem
Conventional imaging lens assemblies for thin electronic devices, such as mobile phones and tablets, require a smaller size while maintaining optical performance, and existing designs fail to meet specific optical conditions that allow for both compact size and cost-effective material usage.
Innovation Solution
An imaging lens assembly with a three-lens structure comprising a first optical lens with positive refractive power, a second optical lens with positive refractive power, and a third optical lens with negative refractive power, along with a constant-aperture diaphragm, arranged to satisfy the optical conditions 0.55 < f/Dg < 0.85 and |V1 - V2| < 10, where f is the focal length, Dg is the diagonal line length, and V1 and V2 are Abbe numbers, ensuring a smaller size and reduced material costs without compromising optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the imaging lens assembly is made smaller to fit thin electronic devices, then the device thickness is reduced, but optical performance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers and Abbe numbers of the lenses to satisfy specific optical conditions (0.55 < f/Dg < 0.85 and |V1-V2| < 10). The third lens uses an aspherical surface with inflection points to correct aberrations in the compact design, maintaining optical performance while reducing size.
Solution Approach 2:
The patent uses composite material principles by combining lenses with different Abbe numbers (V1 and V2 where |V1-V2| < 10) to achieve chromatic aberration correction in a compact configuration. The aspherical third lens combines negative refractive power with specific surface geometry to correct multiple aberrations simultaneously.
2Ease of manufacture
If conventional three-lens structure is used, then manufacturing is simpler, but optical performance cannot satisfy the condition 0.55 < f/Dg < 0.85
Solution Approach 1:
The patent changes the optical parameters by specifying precise refractive power relationships (first lens positive, second lens positive, third lens negative) and Abbe number constraints (|V1-V2| < 10). The aspherical surface with inflection points on the third lens provides the necessary correction to meet the f/Dg condition while remaining manufacturable.
3Reliability
If lens materials are optimized for performance, then optical quality improves, but material costs increase
Solution Approach 1:
The patent optimizes material selection by constraining the Abbe numbers to satisfy |V1-V2| < 10, which enables chromatic aberration correction using cost-effective material combinations. The aspherical third lens with negative refractive power provides aberration correction that reduces the need for expensive multi-element designs.
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 allows for a smaller imaging lens assembly size while maintaining optical performance and reducing material costs by adhering to specific optical conditions, ensuring efficient use of materials and minimizing size constraints.
Implementation Method 1
The first optical lens has a positive refractive power near the optical axis
Implementation Method 2
the second optical lens has a positive refractive power near the optical axis
Implementation Method 3
the third optical lens has a negative refractive power near the optical axis
Implementation Method 4
The third optical lens has an aspherical object-side surface that faces the object side, an asperhical image-side surface that faces the image side
Data Source
AI summary
An imaging lens assembly includes first, second and third optical lenses that are arranged sequentially from an object side to an image side along an optical axis, and a constant-aperture diaphragm disposed between the second optical lens and the object side. Each of the first and second optical lenses has a positive refractive power near the optical axis. The third optical lens has a negative refractive power near the optical axis and has an object-side surface and an image-side surface, at least one of which has at least an inflection point. The imaging lens assembly satisfies: 0.55<f/Dg<0.85, in which, f is a focal length of the imaging lens assembly, and Dg is a length of a diagonal line of a maximum viewing angle in an imaging plane.