Six-Lens Imaging Assembly with Aspheric Curvature for Thin Profile
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Solution Overview
Problem
Existing imaging lens assemblies for digital cameras and web cameras are too thick to meet miniaturization requirements due to a high total track length to image height ratio, compromising their ability to achieve a wide-angle view with high luminous flux and thin profile.
Innovation Solution
A six-lens imaging lens assembly with specific refractive power and curvature radius conditions, including aspheric surfaces, is designed to optimize optical characteristics, ensuring a total track length to image height ratio of less than 1.35, a view angle of at least 76°, and an F-number of less than 2.2, while maintaining an ultra-thin profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional six-lens imaging lens assembly is used, then good optical characteristics can be achieved, but the total track length to image height ratio becomes greater than 1.46, making the lens assembly too thick
Solution Approach 1:
The patent applies parameter changes by carefully controlling the refractive indices and Abbe numbers of the lens materials. Specifically, it uses a first lens with refractive index 1.5-1.7 and Abbe number 20-60, and a second lens with refractive index 1.6-1.8 and Abbe number 15-40. This optimization of material parameters enables the lens assembly to achieve TTL/IH ≤ 1.35 while maintaining good optical characteristics, thereby resolving the contradiction between optical performance and compact size.
2Length of stationary object
If the lens assembly is made thinner to meet miniaturization requirements, then the total track length decreases, but the view angle and luminous flux may be compromised
Solution Approach 1:
The patent employs aspheric surfaces for the first and second lenses, characterized by aspheric coefficients k1 and k2. The aspheric curvature allows the lens to achieve wide view angle (2ω ≥ 76°) and high luminous flux (Fno ≤ 2.2) while maintaining a compact total track length to image height ratio of ≤ 1.35. This curvature optimization enables simultaneous achievement of miniaturization and wide-angle capability.
3Length of stationary object
If the lens assembly is made thinner to meet miniaturization requirements, then the total track length decreases, but the F-number (luminous flux) may be reduced
Solution Approach 1:
The patent optimizes material parameters by selecting specific refractive index ranges (1.5-1.7 for first lens, 1.6-1.8 for second lens) and Abbe number ranges (20-60 for first lens, 15-40 for second lens). This parameter optimization enables the lens assembly to achieve Fno ≤ 2.2 (high luminous flux) while maintaining TTL/IH ≤ 1.35, thereby resolving the contradiction between compact size and light-gathering capability.
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 achieves good optical characteristics, an ultra-thin profile, and high luminous flux, making it suitable for high-resolution CCD or CMOS imaging components in mobile phones and web cameras.
Implementation Method 1
an imaging lens assembly LA includes a lens set with six lenses, that is, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6, which are arranged in that order from the object side to the image plane
Data Source
AI summary
An imaging lens assembly is provided in the present disclosure. The imaging lens assembly includes a first lens with positive refractive power; a second lens with negative refractive power; a third lens with negative refractive power; a fourth lens with positive or negative refractive power; a fifth lens with positive refractive power; and a sixth lens with negative refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side, and satisfy conditions provided in the present disclosure.