Six-Element Aspheric Imaging Lens Assembly for Compact Telephoto Optics
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Solution Overview
Problem
Conventional telephoto lens systems with spherical glass lens elements are unfavorable for reducing the size of lens assemblies, leading to larger and thicker imaging apparatuses, limited aperture size, and insufficient image brightness, failing to meet the miniaturization and image quality demands of modern electronic devices.
Innovation Solution
An imaging lens assembly comprising six lens elements with at least one aspheric surface and specific refractive powers, including a first convex-positive, second convex-positive, third convex-concave-negative, fourth concave-concave-negative, fifth concave-convex-positive, and sixth concave-convex-negative elements, with air gaps and an aperture stop, to achieve compactness and high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If spherical glass lens elements are used in conventional telephoto lens systems, then the lens assembly can be manufactured with standard materials, but the size of the lens assembly cannot be reduced
Solution Approach 1:
The patent changes the geometric parameter of lens surfaces from spherical to aspheric, and modifies the refractive index parameters by using plastic materials with specific refractive indices (1.545, 1.669, 1.544) instead of conventional glass. This allows the lens assembly to achieve compact size while maintaining manufacturability through injection molding processes.
Solution Approach 2:
The patent employs composite material design by combining multiple plastic lens elements with different refractive indices and dispersion characteristics. The first lens element uses plastic with refractive index 1.545, the second uses plastic with refractive index 1.669, and the third uses plastic with refractive index 1.544, creating a composite optical system that achieves miniaturization while controlling aberrations.
2Illumination intensity
If the aperture size is limited in compact telephoto lens systems, then the lens assembly size can be reduced, but the image brightness becomes insufficient
Solution Approach 1:
The patent changes the material parameter by using plastic lenses with optimized refractive indices to achieve higher aperture ratios. The specific refractive index values (1.545, 1.669, 1.544) are selected to enable a larger aperture diameter while keeping the lens assembly compact, thereby improving image brightness without increasing overall size.
3Measurement precision
If conventional optical systems are used, then the lens assembly can be simpler in design, but the view angle is not suitable for capturing detailed images from afar
Solution Approach 1:
The patent applies local quality optimization by designing each lens element with specific aspheric coefficients and curvature values tailored to its position in the optical system. The first lens element has aspheric coefficient k1, the second has k2, and the third has k3, with each optimized for its specific function in the telephoto configuration, enabling detailed distant imaging while controlling overall complexity.
Solution Approach 2:
The patent uses aspheric surfaces instead of spherical surfaces for all three lens elements, with specific aspheric coefficients (k1, k2, k3) optimized for telephoto imaging. This curvature optimization enables the system to capture detailed images from afar by improving off-axis performance and reducing distortion, while the compact design keeps the overall device complexity manageable.
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 enables a compact imaging lens assembly with improved image brightness, wider field of view, and enhanced image quality, suitable for miniaturized electronic devices.
Implementation Method 1
an imaging lens assembly includes six lens elements, the six lens elements being, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element
Data Source
AI summary
An imaging lens assembly includes six lens elements, which are, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The sixth lens element has negative refractive power. At least one surface of an object-side surface and an image-side surface of at least one lens element of the six lens elements is aspheric.