Wide-Angle Lens Design for Compact Field of View
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Solution Overview
Problem
Conventional wide-angle lenses with three lenses suffer from a small field of view and deteriorating resolution at elevated temperatures or when the object-lens distance exceeds 300 mm, failing to meet the requirements of miniaturization and high resolution in digital cameras and cell phones.
Innovation Solution
A wide-angle lens design comprising a biconcave first lens, a meniscus second lens, and a positive refractive power third lens, with specific diameter and Abbe number ratios, and aspheric surfaces, optimized to reduce total lens length while maintaining high resolution and field of view, even at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional three-lens assembly is used, then miniaturization and high resolution are achieved, but the field of view becomes relatively small
Solution Approach 1:
The patent applies parameter changes by modifying the refractive power distribution among lens elements, specifically setting the first lens with negative refractive power and the second and third lenses with positive refractive power. The Abbe number relationships (Vd1 > Vd2 and Vd3 > Vd2) and diameter ratios (D1/DL2 ≥ 2.9) are optimized to expand the field of view while maintaining compact structure and high resolution
2Reliability
If a conventional three-lens assembly is used, then high resolution is achieved, but resolution deteriorates when temperature reaches 60°C or object-lens distance is 300 mm
Solution Approach 1:
The patent uses parameter changes by optimizing the Abbe numbers of the lens materials and their relationships (Vd1 > Vd2 and Vd3 > Vd2). This material parameter selection compensates for thermal effects and maintains chromatic aberration correction across varying temperatures and object distances, ensuring resolution stability
Solution Approach 2:
The patent applies dynamics by designing the lens assembly to dynamically adapt to changing conditions through its optical configuration. The specific arrangement of positive and negative power elements allows the system to maintain performance across different temperatures and object distances without mechanical adjustment
3Adaptability or versatility
If lens elements are added to increase field of view, then field of view expands, but total lens length increases
Solution Approach 1:
The patent applies merging by combining multiple functions into a compact three-element configuration. The first lens with negative power and the second and third lenses with positive power work together in an integrated arrangement that achieves wide field of view without proportionally increasing total length, as evidenced by the constrained ratio TTL/Df ≤ 3.1
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 a shortened total lens length, increased field of view, and improved optical performance, ensuring resolution and aberration correction at 60°C or when the object-lens distance is 300 mm, thereby addressing the limitations of conventional lenses.
Implementation Method 1
a first lens with negative refractive power
Implementation Method 2
a second lens with positive refractive power and including a convex surface facing the object side and a concave surface facing the image side
Implementation Method 3
a third lens with positive refractive power and including a convex surface facing the image side
Data Source
AI summary
A wide-angle lens comprises sequentially from an object side to an image side along an optical axis a first lens, a second lens, a stop and a third lens. The first lens is a biconcave lens and with negative refractive power. The second lens is a convex-concave lens with positive refractive power and includes a convex surface facing the object side and concave surface facing the image side. The third lens is with positive refractive power and includes a convex surface facing the image side. The wide-angle lens satisfies the following condition: 2.9<DL1DL2<3.1 wherein DL1 is an effective diameter of the first lens and DL2 is an effective diameter of the second lens.