Five-Piece Wide-Angle Lens Module for Low Distortion
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Solution Overview
Problem
Surveillance cameras with wide-angle characteristics face challenges in achieving low distortion and high imaging quality, which are essential for effective event detection in household and working areas.
Innovation Solution
A five-piece wide-angle lens module is designed with specific refractive powers and surface curvatures for the lenses, along with optimized thickness and distance relationships, to minimize refraction angles and manufacturing sensitivity, ensuring low distortion and high imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a wide-angle lens is used to capture broad fields of view in surveillance cameras, then the coverage area is improved, but distortion increases and imaging quality deteriorates
Solution Approach 1:
The lens system is divided into five separate lens elements with different refractive powers and surface curvatures. Each lens element is optimized to handle specific optical functions, allowing the system to achieve wide-angle coverage while controlling distortion and maintaining imaging quality through coordinated optical design.
Solution Approach 2:
Different regions of the lens system have different optical properties. The first lens has negative refraction power with specific surface curvatures to control peripheral rays, while subsequent lenses have positive refraction power to correct aberrations. This localized optimization of optical properties enables simultaneous achievement of wide angle and high imaging quality.
2Ease of manufacture
If lens thickness and spacing are reduced to minimize refraction angles, then manufacturing sensitivity is reduced, but the focal length and field of view become constrained
Solution Approach 1:
The patent optimizes specific parameters including the thickness of individual lens elements (T5, T7, T9) and the spacing between them (T6, T8, T10). By carefully adjusting these parameters to satisfy the relationship 30≥(T5+T7+T9)/(T6+T8+T10)≥10, the system achieves minimal refraction angles for reduced manufacturing sensitivity while maintaining appropriate focal length and field of view.
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 provides a lens module with characteristics of wide-angle, low distortion, high photosensitivity efficiency, and high imaging quality, effectively addressing the challenges of surveillance camera optics.
Implementation Method 1
The first lens has negative refraction power, a convex surface on the object side and a concave surface on the image side. The second lens, the third lens and the fifth lens all have positive refraction power, and each of them has two convex surfaces on both sides.
Data Source
AI summary
A five-piece wide-angle lens module includes, from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has negative power, a convex surface on the object side and a concave surface on the image side. The second lens, the third lens and the fifth lens all have positive power and two convex surfaces on both sides. The fourth lens has negative power and two concave surfaces on both sides. The five-piece wide-angle lens module further satisfies the following relationship: 30≥(T5+T7+T9)/(T6+T8+T10)≥10. Thereby, the incident light can have smaller refraction angle when transmitting through the lenses, and thus the five-piece wide-angle lens module can be provided with characteristics of low manufacturing sensitivity, wide angle, low distortion, high photosensitivity efficiency and high image quality.