Wide-angle lens assembly with cemented groups for compact design
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Solution Overview
Problem
Existing wide-angle lenses fail to meet the requirements of miniaturization, wide field of view, large aperture, and resistance to environmental temperature changes simultaneously while maintaining good optical performance.
Innovation Solution
A wide-angle lens assembly comprising specific lenses with negative and positive refractive powers, cemented together with aspheric surfaces and a stop, optimized for a shortened total lens length, increased field of view, decreased F-number, and resistance to temperature changes, ensuring excellent optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens assembly is miniaturized to reduce total length, then the lens length is reduced, but the field of view becomes narrower and optical performance deteriorates
Solution Approach 1:
The lens assembly is divided into multiple individual lenses and cemented lens groups (first cemented lens with negative refractive power, second cemented lens with positive refractive power). This segmentation allows each component to contribute differently to light refraction, enabling a compact overall structure while maintaining a wide field of view through optimized individual lens functions.
Solution Approach 2:
The patent employs asymmetric surface designs including aspheric surfaces on specific lens elements (such as the sixth lens having an aspheric object-side surface). This asymmetry enables better control of light rays at different angles, achieving a wide field of view within a shortened lens length while correcting aberrations that would otherwise degrade optical performance.
2Illumination intensity
If the aperture is increased to improve light gathering ability, then the F-number is reduced, but the lens complexity and difficulty of aberration correction increase
Solution Approach 1:
The patent uses cemented lens groups where different lens materials with specific refractive indices and Abbe numbers are bonded together (such as the first cemented lens combining lenses with different dispersive properties). This composite structure enables effective aberration correction at large apertures by compensating for chromatic and spherical aberrations through the complementary optical properties of different materials, without requiring excessive lens elements.
3Adaptability or versatility
If the lens structure is optimized for wide field of view and large aperture, then the field of view and aperture are improved, but the resistance to temperature changes deteriorates
Solution Approach 1:
The patent carefully selects and controls optical parameters including refractive indices, Abbe numbers, and radius of curvature values for each lens element. By optimizing these parameters within specific ranges, the design achieves a balance where the lens maintains its wide field of view and large aperture performance while exhibiting reduced sensitivity to temperature variations, as the optimized parameter combinations compensate for thermal expansion and refractive index changes.
4Length of moving object
If multiple lenses are cemented together to reduce total length, then the lens length is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent combines multiple lens elements into cemented lens groups (first and second cemented lenses) where adjacent lenses are optically bonded. This merging reduces the overall lens length by eliminating air gaps and reduces the number of separate mounting interfaces. The cementing process integrates multiple optical surfaces into unified functional groups, thereby reducing cumulative alignment errors and simplifying mechanical mounting requirements compared to keeping all lenses separate.
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 achieves a shortened total lens length, wider field of view, decreased F-number, and improved resistance to temperature changes, effectively correcting aberrations and maintaining high optical performance.
Implementation Method 1
The first lens L11 has negative refractive power, the second lens L12 has negative refractive power, the third lens L13 has positive refractive power, the fourth lens L14 has positive refractive power, the fifth lens L15 has negative refractive power, and the sixth lens L16 has positive refractive power
Data Source
AI summary
A wide-angle lens assembly comprises sequentially from an object side to an image side along an optical axis a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens is with negative refractive power and includes a concave surface facing the image side. The second lens includes a concave surface facing the object side. The third lens includes a convex surface facing the image side. The fourth lens includes a convex surface facing the object side. The fifth lens includes a concave surface facing the image side. The sixth lens is a biconvex lens with positive refractive power. The second lens and the third lens are cemented to form a first cemented lens with positive refractive power. The fourth lens and the fifth lens are cemented to form a second cemented lens with positive refractive power.