Compact Aspherical Lens System for Wide-Angle Imaging
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Solution Overview
Problem
The challenge is to develop a compact, lightweight, and high-resolution optical lens system with a wide viewing angle for mobile devices, as existing camera lenses face limitations in performance due to space constraints and material limitations, particularly with plastic lenses.
Innovation Solution
The proposed optical lens system includes a lens group with at least one aspherical lens, a stop, and an image sensor, optimized with specific refractive power distributions and Abbe's numbers, along with a specific wavelength blocking portion, to achieve a wide viewing angle and high resolution while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a compact lens is implemented by using plastic as a material of a camera lens, then weight is reduced and manufacturing cost is decreased, but optical performance is limited
Solution Approach 1:
The lens system is divided into multiple lens groups (first lens group with positive refractive power and second lens group with negative refractive power), each containing multiple lenses with specific functions. This segmentation allows plastic lenses to achieve complex optical functions that would be difficult in a single-element lens, thereby improving overall optical performance while maintaining the weight advantages of plastic materials.
Solution Approach 2:
The patent employs a composite lens design where plastic lenses are combined with specific optical coatings and structured surfaces. The use of multiple plastic lenses with different refractive indices and Abbe numbers creates a composite optical system that overcomes the limitations of single-material plastic lenses, achieving both lightweight construction and high optical performance.
2Volume of moving object
If the lens system is miniaturized for mobile phone mounting, then space requirement is reduced, but viewing angle and resolution are limited
Solution Approach 1:
The lens system incorporates movable lens groups that can shift positions to adjust the optical path and effective focal length. This dynamic capability allows the compact lens system to achieve a wide viewing angle (85-150 degrees) by changing the optical configuration, effectively decoupling the viewing angle from the physical size constraints.
Solution Approach 2:
The patent utilizes aspherical lens surfaces with complex curvature variations in multiple dimensions. By employing aspherical surfaces with specific radius of curvature distributions, the system achieves wide-angle performance and high resolution within a compact form factor, effectively using dimensional complexity to overcome size limitations.
3Ease of manufacture
If plastic lenses are used to reduce weight, then manufacturing cost is decreased, but aberration correction is difficult
Solution Approach 1:
The patent systematically varies multiple parameters including refractive index, Abbe number, aspherical coefficients, and lens spacing to optimize aberration correction. By carefully selecting and adjusting these parameters across multiple plastic lens elements, the system achieves superior aberration control while maintaining the manufacturing advantages of plastic lenses, including injection molding 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 system achieves a wide viewing angle of 85-150 degrees, high optical performance, and minimizes aberrations, enabling its application in compact devices such as mobile communication devices while reducing manufacturing costs and weight by using plastic lenses.
Implementation Method 1
a lens group including at least one aspherical lens
Implementation Method 2
at least one aspherical lens
Implementation Method 3
a stop, a lens group including at least one aspherical lens
Implementation Method 4
an image sensor configured to record an image transmitted through the lens group
Implementation Method 5
a specific wavelength blocking portion provided between the lens group and the image sensor
Data Source
AI summary
Disclosed is a photographic optical lens system. The disclosed photographic optical lens system includes a stop, a lens group including at least one aspherical lens, and an image sensor configured to record an image transmitted through the lens group, wherein the photographic optical lens system satisfies the following Expression:0.15≤(DL1-L2)/OAL≤0.4 <Expression>where DL1-L2 in Expression denotes a distance from a center of a first surface of a lens closest to an object (hereinafter, referred to as a first lens) to a center of a second surface of a second lens arranged directly next to the first lens, and OAL denotes a distance (a total length of the lens group) from the center of the first surface of the first lens to a center of a second surface of a lens arranged farthest from the object.