Five-Lens Camera Assembly for Ultra-Thin Telephoto Imaging
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Solution Overview
Problem
Current camera lens assemblies face challenges in achieving a balance between being ultra-thin, high-pixel, and capable of capturing clear images of distant objects, as they often compromise on image quality or design complexity.
Innovation Solution
A camera lens assembly comprising five lenses with specific refractive powers and configurations, including positive and negative refractive powers, convex and concave surfaces, and optimized focal lengths, which satisfy certain ratios and constraints to achieve a compact, high-image-quality telephoto lens design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a telephoto lens assembly is designed to capture distant objects with high spatial angle resolution, then image quality for distant objects is improved, but the lens assembly becomes thicker and heavier
Solution Approach 1:
The telephoto lens assembly is divided into five separate lens elements with alternating positive and negative refractive powers. This segmentation allows each lens element to be optimized for specific optical functions while keeping individual element thicknesses minimal, achieving overall compactness while maintaining telephoto imaging capability
Solution Approach 2:
The patent employs a composite lens structure combining materials with different refractive indices and Abbe numbers. Specifically, the first lens uses material with refractive index 1.5-1.7 and Abbe number 20-40, while the second lens uses material with refractive index 1.6-1.8 and Abbe number 25-45, creating a composite optical system that achieves high resolution with reduced thickness
2Length of moving object
If the lens assembly is made thinner to meet ultra-thin design requirements, then portability is improved, but image quality and ability to capture distant objects deteriorates
Solution Approach 1:
The patent optimizes key parameters including the ratio of effective focal length to combined focal length of fourth and fifth lenses (−1.0<f/f45<0.5), the thickness ratio of third lens (0.8<CT3/ET3<1.2), and the focal length ratio of third and fourth lenses (f4/|f3|<0.3). These parameter optimizations enable ultra-thin design while maintaining image quality
Solution Approach 2:
The lens assembly incorporates aspheric surfaces with dynamically optimized curvature radii and conic coefficients. The object-side surface of the first lens has conic coefficient −0.5<K1<0.5, and the image-side surface of the fifth lens has −0.5<K5<0.5, allowing the optical path to be efficiently folded within a thinner form factor
3Measurement precision
If five lenses with alternating positive and negative refractive powers are used to control aberrations, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple lens elements into a compact five-element assembly where the third lens can be either positive or negative power, providing design flexibility that reduces overall complexity. The fourth and fifth lenses are positioned with specific spacing (0.3<T45<0.7mm) to combine their aberration correction functions efficiently
Solution Approach 2:
By optimizing parameters such as the focal length ratio f4/|f3|<0.3 and the thickness ratio CT3/ET3 within 0.8-1.2, the patent simplifies the design space and manufacturing tolerances, making the complex five-element system more manageable in terms of fabrication and assembly
4Measurement precision
If the focal length is increased to capture distant objects clearly, then telephoto capability is improved, but the lens assembly length increases
Solution Approach 1:
The patent transitions from a traditional linear telephoto design to a compact folded optical path using aspheric surfaces and alternating refractive powers. The effective focal length can be 4mm-10mm while the total track length is reduced to 3mm-6mm by optimizing the spatial arrangement in multiple dimensions rather than simply extending the optical axis
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 proposed lens assembly achieves a good balance of image quality, miniaturization, and manufacturing performance by controlling spherical aberrations, distortion, and field curvature, enabling clear imaging of distant objects while maintaining a thin and lightweight design.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, and a fifth lens which are arranged from an object side to an image side sequentially; the first lens has a positive refractive power; the second lens has a negative refractive power; 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 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. The second lens has a negative refractive power. The third lens has a positive refractive power or a negative refractive power. The fourth lens has a positive refractive power. The fifth lens has a negative refractive power. An effective focal length f of the camera lens assembly and a combined focal length f45 of the fourth lens and the fifth lens satisfy: −1.0<f/f45≤−0.5. The camera lens assembly according to the present disclosure is an ultra-thin telephoto lens assembly structure having 5 lenses and high pixels, which may obtain a good image quality and a good processing and manufacturing performance.