Five-Lens Optical Camera Lens Design for Low TTL and Wide Angle
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Solution Overview
Problem
Conventional camera lenses with a five-lens structure struggle to achieve low total track length, wide angle, and low sensitivity simultaneously, leading to suboptimal imaging quality in miniaturized camera systems.
Innovation Solution
An optical camera lens design with a five-lens configuration, where each lens has specific refractive powers and curvature radii, and is made of glass or plastic, with aspheric surfaces to minimize aberrations and reduce the total track length, while maintaining miniaturization and improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a five-lens structure is adopted to eliminate major aberration, then imaging quality is improved, but total track length increases and angle of view decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of the five lens elements. Specifically, it sets the refractive index of the third lens between 1.65-1.75 and the fourth lens between 1.50-1.60, with Abbe numbers in specific ranges. This parameter optimization allows the lens system to achieve low total track length while maintaining wide angle and correcting aberrations, resolving the contradiction between imaging quality and compact size.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements (first, third, fourth, and fifth lenses) with dynamically optimized curvature radii and aspheric coefficients. This allows the optical system to adaptively correct spherical aberration, coma, and other distortions across different field angles, achieving high imaging quality in a compact five-lens configuration without requiring additional lens elements.
2Manufacturing precision
If a five-lens structure is adopted to eliminate major aberration, then imaging quality is improved, but the system becomes more complex
Solution Approach 1:
The patent segments the optical system into five specialized lens elements, each with specific refractive power and aberration correction function. The first lens (positive power) handles initial light convergence, the second lens (negative power) corrects chromatic aberration, the third lens (positive power, high refractive index) controls spherical aberration, the fourth lens (positive power, lower refractive index) fine-tunes focal properties, and the fifth lens (negative power) corrects field curvature. This functional segmentation achieves comprehensive aberration correction while maintaining a compact five-element structure.
Solution Approach 2:
The patent uses composite material selection by combining lenses with different refractive indices and Abbe numbers. Specifically, it pairs high refractive index glass (1.65-1.75) for the third lens with lower refractive index plastic or glass (1.50-1.60) for the fourth lens, creating a composite optical system that leverages the complementary optical properties of different materials to correct multiple types of aberrations simultaneously.
3Volume of moving object
If pixel size of photosensitive component is reduced for miniaturization, then device size decreases, but imaging quality deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-correcting various optical aberrations (spherical aberration, coma, astigmatism, field curvature, and chromatic aberration) through the five-lens design before light reaches the photosensitive component. This preliminary correction ensures that even with reduced pixel size, the incoming light rays are properly focused and corrected, maintaining high imaging quality in miniaturized devices with total track length under 2.0mm.
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 design achieves a wide angle and reduced sensitivity while correcting aberrations, ensuring high-quality imaging and meeting the requirements of low total track length and miniaturization.
Implementation Method 1
the first lens has a positive refraction power, the second lens has a negative refraction power, the third lens has a positive refraction power, the fourth lens has a positive refraction power, and the fifth lens has a negative refraction power
Data Source
AI summary
The present disclosure provides an optical camera lens, which includes: an aperture, a first lens having positive refraction power, a second lens having negative refraction power, a third lens having positive refraction power, a fourth lens having positive refraction power, and a fifth lens having negative refraction power; a combined focal length of the first lens and the second lens is f12, a focal length of the third lens is f3, a total track length of the integral optical camera lens is TTL, an image height of the integral optical camera lens is IH, curvature radii of the object-side surface and the image-side surface of the third lens is r5 and r6, respectively, which satisfy the following relational expressions: 53<f3/f12<68; TTL/IH<1.4; 0.95<r5/r6<1.1; f3>200. The optical camera lens provided by the present disclosure can satisfy the needs on low TTL and wide angle, meanwhile reducing sensitivity of the component.