Four-Element Optical Lens Assembly for Wide Viewing Angle
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Solution Overview
Problem
Conventional optical imaging lens assemblies with a wide viewing angle in portable electronic devices suffer from suboptimal imaging quality due to limitations in refractive power distribution and aberration correction, particularly in three-lens configurations, which fail to meet the requirements for both optical imaging quality and miniaturization.
Innovation Solution
An optical imaging lens assembly comprising four lens elements with specific refractive powers and aspheric surfaces, including a first lens with negative power, a second with positive power, a third with negative power, and a fourth with positive power, optimized through precise curvature radii, thicknesses, and refractive indices to achieve a wider viewing angle and improved imaging quality, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a three-lens configuration is adopted to achieve miniaturization, then the total track length is reduced, but the imaging quality deteriorates
Solution Approach 1:
The patent divides the optical system into four distinct lens elements with alternating refractive powers (negative, positive, negative, positive). This segmentation allows each element to contribute differently to the overall optical performance, enabling both compact size and high imaging quality by distributing the optical functions across multiple specialized components rather than relying on a simpler three-element design.
2Adaptability or versatility
If the stop is disposed at the back end of the optical system to achieve a wide viewing angle, then the viewing angle is widened, but the imaging quality deteriorates due to limited aberration correction capability
Solution Approach 1:
The patent positions the stop between the second and third lens elements, which is a preliminary positioning that enables the subsequent third and fourth lens elements to effectively correct aberrations. This strategic placement of the stop before the final lens elements allows these elements to work optimally for aberration correction while maintaining the wide viewing angle, resolving the contradiction between viewing angle and imaging quality.
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 provides an optical imaging lens assembly with enhanced imaging quality, a wider viewing angle, and a reduced total track length, effectively addressing the limitations of conventional designs by optimizing refractive power distribution and aberration correction.
Implementation Method 1
a first lens element with negative refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power
Data Source
AI summary
An optical imaging lens assembly comprises, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element. There is a stop disposed between the first lens element and the third lens element. The first lens element has negative refractive power, the second lens element has positive refractive power, the third lens element has negative refractive power, and the fourth lens element has positive refractive power. The first lens element has a convex object-side surface and a concave image-side surface. The third lens element and the fourth lens element both have at least one of its object-side surface and its image-side surface being aspheric. With the aforementioned arrangement, the optical imaging lens assembly of the present invention can obtain a larger viewing angle, lower sensitivity and higher resolution.