Compact Wide-Angle Optical System Using Aspheric Lenses
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Solution Overview
Problem
Existing wide-angle lenses for on-board cameras do not meet the demand for miniaturization while maintaining a wide angle of view.
Innovation Solution
The optical system comprises a front group with a first negative refractive power lens and a second aspheric lens, and a rear group with multiple lenses having positive and negative refractive powers, including aspheric surfaces, to achieve a compact design with a wide angle of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a wide-angle lens with projection characteristic close to orthogonal projection method is used, then the angle of view is widened, but the overall length of the optical system increases
Solution Approach 1:
The patent employs aspheric surfaces on specific lenses (second lens and sixth lens) to correct aberrations and enable compact design. The aspheric shapes allow for better light control and aberration correction in a shortened optical path, resolving the contradiction between wide angle of view and compact size.
Solution Approach 2:
The patent optimizes specific parameter ranges including focal lengths of individual lenses, distances between lens groups, and aspheric coefficients to achieve both wide angle of view and compact overall length. By carefully controlling parameters like f1/f (first lens focal length to system focal length ratio) and the spacing between lens elements, the design achieves miniaturization while maintaining wide-angle performance.
2Length of stationary object
If the optical system is miniaturized, then the overall length is reduced, but aberration correction becomes more difficult
Solution Approach 1:
Aspheric surfaces are implemented on the second lens and sixth lens to provide superior aberration correction capability in a compact configuration. The aspheric shapes enable control of spherical aberration, coma, and other off-axis aberrations that would be difficult to correct with conventional spherical surfaces in a miniaturized system.
Solution Approach 2:
The patent uses a combination of different lens materials with specific refractive indices and Abbe numbers to achieve chromatic aberration correction. By selecting materials with complementary optical properties and combining them in specific configurations, the design corrects multiple types of aberrations simultaneously while maintaining compact dimensions.
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
This configuration effectively corrects spherical aberration, on-axis aberration, and curvature of field, allowing for a reduced overall length of the optical system while maintaining high resolution in the central area and a wide angle of view.
Implementation Method 1
a first lens having negative refractive power
Implementation Method 2
a second lens having an aspheric surface... a sixth lens having an aspheric surface
Implementation Method 3
This configuration effectively corrects spherical aberration, on-axis aberration, and curvature of field
Implementation Method 4
a third lens having positive refractive power, a fourth lens having positive refractive power
Implementation Method 5
a fifth lens having negative refractive power
Implementation Method 6
This configuration effectively corrects spherical aberration, on-axis aberration, and curvature of field
Data Source
AI summary
An optical system includes, in order from an object side to an image side, a front group that includes, in order from the object side to the image side, a first lens having negative refractive power and a second lens having an aspheric surface, and a rear group includes, in order from the object side to the image side, a third lens having positive refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, and a sixth lens having an aspheric surface. On an optical axis, an object-side surface of the first lens is convex, an object-side surface of the second lens is convex, and an object-side surface of the sixth lens is concave.