Five-Lens Thin Wide-Angle Imaging Assembly with Aspheric Correction
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Solution Overview
Problem
Conventional lens structures for image display in electronic devices are bulky and lack efficiency, failing to achieve a balance between compactness and high resolution.
Innovation Solution
A thin-type wide-angle imaging lens assembly with five lenses, featuring a specific arrangement of lenses with positive and negative refractive powers, aspheric surfaces, and a fixing diaphragm, optimized by curvature, interval, and optical parameters to achieve a shorter height and high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If conventional lens structures are used for image display, then the lens assembly can be manufactured, but it results in big volume and lacks efficiency
Solution Approach 1:
The lens assembly is divided into five separate lens elements (first lens L1, second lens L2, third lens L3, fourth lens L4, and fifth lens L5) with specific refractive powers and surface configurations. This segmentation allows each lens to be optimized for specific optical functions while maintaining a compact overall structure, resolving the contradiction between volume reduction and manufacturing efficiency.
Solution Approach 2:
The patent applies specific parameter changes including aspheric surface coefficients (A4, A6, A8, A10, A12), curvature radii (R1-R10), thickness values (d1-d6), and refractive indices (Nd1-Nd5, Vd1-Vd5) to optimize the optical path and reduce the overall lens volume while maintaining manufacturing feasibility through standardized parameter ranges.
2Length of stationary object
If the lens assembly is made thinner with five lenses, then the height is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs aspheric surfaces on multiple lenses with specifically designed aspheric coefficients (A4, A6, A8, A10, A12) to correct optical aberrations while maintaining a thin profile. The aspheric configurations allow for reduced height by eliminating the need for additional corrective lenses, thereby reducing overall height without proportionally increasing manufacturing precision requirements.
Solution Approach 2:
The lens assembly uses multiple lens materials with different refractive indices (Nd1=1.723, Nd2=1.698, Nd3=1.696, Nd4=1.644, Nd5=1.588) and Abbe numbers (Vd1=26.6, Vd2=36.7, Vd3=34.0, Vd4=46.3, Vd5=42.3) to achieve chromatic aberration correction and optical optimization within a thin structure, balancing height reduction with manageable manufacturing precision requirements.
3Measurement precision
If five lenses are used with specific arrangements, then high resolution and ultra-wide-angle imaging are achieved, but the device complexity increases
Solution Approach 1:
Each lens element serves multiple functions: the first lens (L1) with positive refractive power provides primary focusing and wide-angle coverage; the second lens (L2) with positive refractive power contributes to focal length adjustment; the third lens (L3) with negative refractive power corrects spherical and chromatic aberrations; the fourth lens (L4) with positive refractive power provides additional focusing control; and the fifth lens (L5) with positive refractive power fine-tunes the optical path. This multi-functionality arrangement achieves ultra-wide-angle imaging (FOV > 85°) and high resolution while managing device complexity through functional integration.
Solution Approach 2:
The patent optimizes specific parameter combinations including curvature radii (R1=-2.156, R2=1.487, R3=0.606, R4=-0.732, R5=-1.068, R6=0.785, R7=0.696, R8=-0.935, R9=-1.668, R10=1.208), thickness values (d1=0.428, d2=0.186, d3=0.249, d4=0.143, d5=0.268, d6=0.135), and spacing distances (Air gaps between lenses) to achieve the desired optical performance with manageable complexity through standardized parameter ranges suitable for mass production.
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 lens assembly achieves a shorter height, high resolution, and reduced weight, correcting aberrations while enabling ultra-wide-angle imaging with an image-capture angle over 85° and low tolerance sensitivity, facilitating mass production and easy assembly.
Implementation Method 1
the first lens with a positive refractive power defined near an optical axis and a concave surface directed toward the image side, and at least one surface of the first lens is aspheric; the second lens with a positive refractive power defined near the optical axis and a convex surface directed toward the image side, and at least one surface of the second lens is aspheric
Implementation Method 2
the fifth lens having a convex surface with a corrugated contour directed toward the object side and disposed near the optical axis, and a concave surface with a corrugated contour directed toward the image side and disposed near the optical axis
Data Source
AI summary
A thin-type wide-angle imaging lens assembly comprises a fixing diaphragm and an optical set including five 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; a fifth lens; and the fixing diaphragm disposed between an object and the third lens. At least one surface of the first, second, and third lenses is aspheric. At least one surface of the fourth and fifth lenses is aspheric. By the concatenation between the lenses and the adapted curvature radius, thickness, interval, refractivity, and Abbe numbers, the assembly attains a shorter height and a better optical aberration.