Five-Lens Camera Assembly for Miniaturized Infrared Imaging
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Solution Overview
Problem
Existing miniaturized camera lens assemblies have large F-numbers, resulting in limited light admission, which compromises the accuracy of detection and identification in infrared imaging and detection applications, necessitating a lens assembly with a large aperture while maintaining a small size.
Innovation Solution
A camera lens assembly comprising five lenses with specific refractive powers and surface types, optimized center thicknesses, and spacing distances along the optical axis, ensuring an effective focal length and entrance pupil diameter ratio less than 1.6, and satisfying various curvature and thickness ratios to achieve miniaturization and high imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera lens assembly is miniaturized, then the size is reduced, but the F-number increases resulting in reduced light admission
Solution Approach 1:
The patent applies parameter changes by optimizing the F-number to be less than 1.6 and carefully controlling the refractive powers, curvatures, and thicknesses of all five lenses. This allows the lens assembly to maintain a compact size while achieving large aperture characteristics that ensure sufficient light admission for infrared imaging applications
Solution Approach 2:
The patent segments the optical system into five distinct lenses with specific refractive powers (positive or negative) and surface curvatures. This segmentation allows each lens to be optimized for specific functions while collectively achieving the dual goals of miniaturization and large aperture, resolving the contradiction between size reduction and light admission
2Illumination intensity
If the F-number is reduced to increase aperture, then light admission improves, but the lens assembly size increases
Solution Approach 1:
The patent achieves an F-number less than 1.6 through precise parameter optimization including refractive powers of individual lenses, surface curvature radii, and center thicknesses. This parameter optimization enables large aperture for improved light admission while maintaining a compact overall lens assembly size suitable for portable devices
Solution Approach 2:
The patent uses a composite lens design with five lenses having different refractive powers (positive and negative) and material properties. This composite structure allows the system to achieve large aperture characteristics without proportionally increasing the overall size, as each lens component is optimized to contribute differently to the optical performance
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 effectively enhances the energy density on the image plane, improving the signal-to-noise ratio and imaging quality, while maintaining a compact size, suitable for portable electronic devices and infrared applications.
Implementation Method 1
The camera lens assembly includes, sequentially along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has a positive refractive power, each of the second lens and the third lens has a positive refractive power or a negative refractive power, the fourth lens has a positive refractive power, and the fifth lens has a negative refractive power
Data Source
AI summary
The present disclosure discloses a camera lens assembly. The camera lens assembly includes, sequentially along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has a positive refractive power, an object-side surface of the first lens is a convex surface, and an image-side surface of the first lens is a concave surface. Each of the second lens and the third lens has a positive refractive power or a negative refractive power. The fourth lens has a positive refractive power, and an image-side surface of the fourth lens is a convex surface. The fifth lens has a negative refractive power, and an object-side surface of the fifth lens is a concave surface. An effective semi-diameter DT52 of an image-side surface of the fifth lens and half of a diagonal length ImgH of an effective pixel area on an image plane of the camera lens assembly satisfy: 0.75<DT52/ImgH<1.