Wide-Angle Imaging Lens Layout for Compact High-Quality Optics
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Solution Overview
Problem
Conventional wide-angle imaging lenses are limited by their shape and material, making it difficult to achieve miniaturization and high imaging quality under a wide field of view.
Innovation Solution
An imaging lens design comprising a first lens group with a glass lens and a second lens group with plastic aspheric lenses, along with an aperture stop and an infrared filter, optimized for miniaturization and high imaging quality, with specific refractive power conditions and lens diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional wide-angle imaging lens design is used, then wide field of view is achieved, but miniaturization is difficult and imaging quality deteriorates
Solution Approach 1:
The patent employs a composite lens structure combining glass and plastic materials. The first lens is made of glass with specific refractive index and Abbe number, while the second and third lenses use plastic materials. This composite approach allows optimization of each lens's optical properties to achieve high imaging quality in a miniaturized wide-angle configuration.
Solution Approach 2:
The patent utilizes aspheric surfaces on multiple lenses including the first, second, and third lenses. The aspheric design corrects optical aberrations inherent in wide-angle lenses, enabling high imaging quality while maintaining a compact form factor. Specific aspheric coefficients are provided for each surface to optimize the optical performance.
2Volume of moving object
If lens miniaturization is pursued, then compact size is achieved, but wide field of view and high imaging quality become difficult to obtain
Solution Approach 1:
The patent employs an aperture stop positioned between the first and second lenses that can be adjusted to control the field of view. The aperture stop diameter is optimized to balance between achieving wide field of view and maintaining high imaging quality while keeping the lens compact. This dynamic control element allows the lens to adapt to different imaging requirements.
Solution Approach 2:
The patent optimizes specific optical parameters including the refractive indices (1.5 < nd1 < 2.0 for glass, 1.4 < nd2 < 1.7 for plastic), Abbe numbers (20 < vd1 < 40 for glass, 20 < vd2 < 40 for plastic), and curvature radii of aspheric surfaces. These parameter optimizations enable the compact lens to achieve wide field of view (half-field of view 35° to 60°) with high imaging quality.
3Manufacturing precision
If glass lenses are used, then high imaging quality is achieved, but manufacturing cost increases
Solution Approach 1:
The patent applies glass material specifically to the first lens where high optical quality is most critical for wide-angle imaging, while using cost-effective plastic materials for the second and third lenses. This localized quality approach maintains high overall imaging quality while reducing manufacturing costs compared to using glass for all lenses.
Solution Approach 2:
The patent replaces expensive glass materials with cheaper plastic materials for the second and third lenses where the optical requirements are less stringent. The plastic lenses can be manufactured using injection molding techniques, significantly reducing production costs while maintaining adequate imaging performance for those specific lens positions.
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 design achieves wide viewing angles, high imaging quality, and miniaturization while maintaining good imaging performance, including 24-hour confocal image-capturing capability and reduced manufacturing costs.
Implementation Method 1
a first lens (1) and a second lens (2) with refractive powers, a third lens (3) and a fourth lens (4) with refractive powers arranged in order from an object side to an image side
Implementation Method 2
an aperture stop disposed between the first lens and the second lens
Implementation Method 3
an infrared filter disposed on one side of the fourth lens away from the first lens and capable of blocking more than 97% of light within a wavelength range of 690 nm to 750 nm
Data Source
AI summary
An imaging lens including a first lens group, a second lens group, and an aperture stop disposed between the first lens group and the second lens group is provided. The first lens group includes at least one and at most three lenses with refractive powers, and the second lens group has a positive refractive power and includes at least two and at most three lenses with a refractive powers. The imaging lens satisfies conditions of 2 mm<LT<20 mm and 0.8<D1/LT<1.4, where D1 is a lens diameter of the lens closest to the object side, and LT is distance along the optical axis between two outermost lens surfaces at opposite ends of the first lens group and the second lens group.