Four-Lens Optical Module with Segmented Third Lens for Aberration Control
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Solution Overview
Problem
Conventional lens modules for high-resolution cameras face challenges in optimizing refractive angles and correcting aberrations, particularly in 4-lens optical systems, which affect image quality and sensitivity.
Innovation Solution
A lens module configuration with a first lens of positive refractive index, a second lens of negative refractive index, a third lens divided into sub-lenses with positive refractive indices, and a fourth lens with a concave center and convex peripheral portion, optimized to satisfy specific focal length and refractive index conditions, and incorporating aspheric surfaces for improved aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a 4-lens optical system is used for high-resolution camera, then the device complexity is reduced, but the ability to correct aberrations and optimize refractive angles deteriorates
Solution Approach 1:
The third lens is divided into three sub-lenses (first, second, and third sub-lenses) with different refractive indices and optical powers. This segmentation allows each sub-lens to contribute differently to aberration correction, enabling a 4-lens system to achieve the aberration correction capability typically requiring more lenses while maintaining reduced device complexity.
2Device complexity
If the refractive angle of each lens is increased to reduce the number of lenses, then the device complexity is reduced, but the sensitivity of the optical system increases
Solution Approach 1:
Different sub-lenses within the third lens have different refractive indices (first and third sub-lenses have positive refractive indices, second sub-lens has negative refractive index) and different optical powers. This local quality variation allows the system to achieve adequate aberration correction with smaller individual refractive angles, thereby reducing optical system sensitivity while maintaining reduced device complexity.
3Ease of manufacture
If conventional lens configurations are used, then manufacturing is simpler, but resolution and aberration correction are insufficient
Solution Approach 1:
The third lens is constructed as a composite structure with three sub-lenses having different refractive indices and optical properties. This composite configuration enables superior aberration correction and image resolution while maintaining manufacturability, as each sub-lens can be fabricated using standard processes and then assembled into the composite third lens unit.
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 reduces the sensitivity of the optical system, enhances resolution, and effectively corrects aberrations, including astigmatism and distortion, while maintaining manufacturing cost-effectiveness and reducing weight.
Implementation Method 1
a first lens, a second lens, a third lens, and a fourth lens that are successively arranged in the direction from an object side to an imaging surface, wherein the first lens has a positive refractive index, the second lens a negative refractive index, the third lens a positive refractive index, and the fourth lens a negative refractive index
Data Source
AI summary
A lens module is disclosed. A lens module in accordance with an embodiment of the present invention includes a first lens, a second lens, a third lens, and a fourth lens that are arranged successively in the direction from an object side to an imaging surface, wherein the first lens has a positive refractive index, the second lens a negative refractive index, the third lens a positive refractive index, and the fourth lens a negative refractive index, wherein the third lens includes a first sub-lens, a second sub-lens, and a third sub-lens that have a positive refractive index, wherein the fourth lens includes a center portion surrounding an optical axis and a peripheral portion surrounding the center portion, wherein the center portion on the imaging surface side is formed in a concave shape and the peripheral portion on the imaging surface side is formed in a convex shape.