Wide-angle lens assembly with alternating refractive powers
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Solution Overview
Problem
Existing wide-angle lens assemblies for vehicles fail to meet requirements of miniaturization, wide field of view, resistance to environmental temperature changes, and variations in ambient light intensity while maintaining good optical performance.
Innovation Solution
A wide-angle lens assembly comprising a sequence of lenses with specific refractive powers and Abbe numbers, including a meniscus lens, convex-concave lens, and biconvex lens, arranged to provide a field of view exceeding 140 degrees, resistance to temperature and light changes, and reduced chromatic aberration, with cemented fifth and sixth lenses and strategically placed stops to enhance optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional lens assembly structures are used, then the lens assembly can be manufactured with standard designs, but the total lens length becomes too long and the field of view is insufficient
Solution Approach 1:
The lens assembly is divided into multiple lens groups with alternating positive and negative refractive powers. Specifically, the sixth lens has positive refractive power while the fifth lens has negative refractive power, creating a segmented structure that enables compact folding of optical paths and achieves both short total length and wide field of view exceeding 140 degrees
2Ease of manufacture
If standard lens materials are used, then manufacturing is simplified, but chromatic aberration increases and optical performance deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for lens materials including Abbe numbers (e.g., 16.1≦Vd5≦23.9 for the fifth lens, 46≦Vd2≦60 for the second lens) and refractive index ratios (Nd1/R11≦0.185). These parameter controls optimize chromatic aberration correction while maintaining manufacturability through cemented lens structures
3Volume of moving object
If lens assembly is miniaturized, then installation space is reduced, but resistance to temperature and light changes deteriorates
Solution Approach 1:
The patent employs composite lens structures with cemented lenses (fifth and sixth lenses cemented together) and alternating positive-negative refractive power groups. This composite design achieves miniaturization while the specific material parameter selections provide thermal and optical stability for resistance to environmental variations
4Adaptability or versatility
If wide field of view is achieved through conventional designs, then angular coverage increases, but lens length and complexity increase
Solution Approach 1:
The patent achieves wide field of view (≥140 degrees) through a dynamic optical design where the sixth lens has positive refractive power and the fifth lens has negative refractive power, creating an alternating pattern that dynamically manages light paths. This structure provides wide coverage while maintaining compact form factor and controlled complexity through systematic lens group arrangement
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, increased field of view, and effective correction of aberrations, ensuring good optical performance across varying environmental conditions.
Implementation Method 1
The first lens is with negative refractive power. The second lens is with negative refractive power. The third lens is with positive refractive power. The fourth lens is with positive refractive power. The fifth lens is with negative refractive power. The sixth lens is with positive refractive power.
Implementation Method 2
The fifth lens and the sixth lens are cemented. no air space exists between the fifth lens and the sixth lens. the fifth lens satisfies 16.1≦Vd5≦23.9, wherein Vd5 is an Abbe number of the fifth lens.
Data Source
AI summary
A wide-angle lens assembly includes a first lens, a second lens, a third lens, a first stop, a fourth lens, a fifth lens and a sixth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with negative refractive power. The second lens is with negative refractive power. The third lens is with positive refractive power. The fourth lens is with positive refractive power. The fifth lens is with negative refractive power. The sixth lens is with positive refractive power. The fifth lens satisfies 16.1≦Vd5≦23.9, wherein Vd5 is an Abbe number of the fifth lens.