Thin Four-Lens Wide-Angle Imaging Assembly with Aspheric Surfaces
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Solution Overview
Problem
Conventional lens structures for image display devices are bulky and lack efficiency, particularly in achieving a balance of compactness and high resolution for wide-angle imaging.
Innovation Solution
A thin-type wide-angle imaging lens assembly with four lenses, comprising a fixing diaphragm and an optical set with specific refractive powers and aspheric surfaces, arranged to achieve a shorter height and high resolution through curvature and optical parameter optimization, including a first lens with positive refractive power, a second lens with negative refractive power, a third lens with two aspheric surfaces and an inflection point, and a fourth lens with negative refractive power and concave surfaces, satisfying conditional expressions for focal length and pixel area coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional lens structure is used for image display devices, then the device can achieve basic imaging function, but the lens assembly becomes bulky and lacks efficiency
Solution Approach 1:
The lens assembly is divided into four distinct lens elements with specific refractive powers (positive, negative, positive, negative), allowing each element to contribute differently to the overall optical function. This segmentation enables compact design while maintaining imaging efficiency through optimized light path control
Solution Approach 2:
The patent introduces aspheric surfaces with inflection points on the lens elements, adding dimensional complexity to the lens surfaces. This allows for better control of light rays in multiple dimensions, achieving high resolution and wide-angle imaging in a compact form factor
2Length of moving object
If the lens assembly is made compact with shorter height, then portability is improved, but achieving high resolution and wide-angle imaging becomes difficult
Solution Approach 1:
The patent employs aspheric surfaces with inflection points on multiple lens elements, replacing traditional spherical surfaces. This curvature variation allows for better control of off-axis light rays, achieving wide-angle imaging and high resolution despite the compact lens height
Solution Approach 2:
The patent optimizes specific optical parameters including the refractive powers of each lens element, the positions of inflection points on aspheric surfaces, and the intervals between lenses. These parameter changes enable the compact assembly to achieve diffraction-limited imaging performance across a wide field of view
3Measurement precision
If multi-lens structure with four lenses is adopted, then resolution and wide-angle capability are improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple optical functions into a four-element lens assembly where each element serves dual purposes: correcting aberrations and contributing to image formation. The aspheric surfaces with inflection points are integrated into the lens elements themselves, eliminating the need for separate correction elements and reducing overall structural complexity
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, high-resolution ultra-wide-angle imaging lens assembly with a shorter height, improved optical performance, and reduced common difference sensitivity, suitable for mass production and miniaturized portable image capturing devices.
Implementation Method 1
the first lens with a positive refractive power and a convex surface directed toward the image side, and at least one surface of the first lens is aspheric; the second lens with a negative refractive power and a convex surface directed toward the image side, and at least one surface of the second lens is aspheric
Data Source
AI summary
A thin-type wide-angle imaging lens assembly comprises a fixing diaphragm and an optical set including four lenses. An arranging order from an object side to an image side is: a first lens; a second lens; a third lens; a fourth lens; and the fixing diaphragm disposed between an object and the second lens. By the concatenation between the lenses and the adapted curvature radius, thickness/interval, refractivity, and Abbe numbers, the assembly attains a big diaphragm with ultra-wide-angle, a shorter height, and a better optical aberration.