Six-Lens Infrared Photography Assembly for Stray Light Control
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Solution Overview
Problem
Existing small infrared lens assemblies face challenges in achieving high resolution and high relative illuminance while balancing field curvature, astigmatism, and stray light sensitivity, which affects the detailed recognition and imaging quality in feature recognition electronic terminal devices.
Innovation Solution
A six-piece lens group design with specific refractive power distributions and spacing element configurations, including conditional expressions to control lens radii, focal lengths, and diameters, to improve field curvature, reduce aberrations, and minimize stray light, ensuring high imaging resolution and relative illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a six-piece lens group with specific refractive power distributions is used to improve field curvature and reduce aberrations, then imaging resolution is improved, but the lens assembly becomes more sensitive to stray light and manufacturing complexity increases
Solution Approach 1:
The patent introduces a light shielding layer as an intermediary element between the lens group and the image sensor. This light shielding layer blocks stray light paths without interfering with the main optical path, thereby resolving the contradiction between achieving high imaging resolution through complex lens design and preventing stray light sensitivity. The light shielding layer acts as a mediator that eliminates the harmful effect while preserving the beneficial optical design.
2Measurement precision
If a six-piece lens group with specific refractive power distributions is used to improve field curvature and reduce aberrations, then imaging resolution is improved, but device complexity increases
Solution Approach 1:
The patent divides the lens assembly into distinct functional segments: a six-piece lens group for high-resolution imaging and a separate light shielding layer for stray light control. This segmentation allows each component to be optimized independently - the lens group focuses on resolving power while the light shielding layer handles stray light - thereby managing overall device complexity through functional decomposition.
Solution Approach 2:
The light shielding layer serves as an intermediary component that addresses stray light issues without requiring redesign of the complex six-piece lens group. By introducing this separate mediating element, the patent resolves the contradiction between achieving high imaging resolution through complex lens design and managing overall device complexity.
3Measurement precision
If spacing elements are configured to control lens positions and reduce aberrations, then imaging quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The light shielding layer is designed to work in conjunction with the spacing elements, where the light shielding layer's position and structure help define the effective optical path. This self-service arrangement means that minor variations in spacing element positioning are compensated by the light shielding layer's geometry, thereby improving imaging quality while reducing the stringency of manufacturing precision requirements for the spacing elements.
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 improved imaging quality with small field curvature, low astigmatism, and high relative illumination, enhancing the ability of electronic devices to recognize details and reducing stray light sensitivity.
Implementation Method 1
a first lens having a refractive power, a second lens having a refractive power, a third lens having a refractive power, a fourth lens having a refractive power, a fifth lens having a refractive power, and a sixth lens having a refractive power, disposed sequentially along an optical axis
Data Source
AI summary
An optical photography lens assembly is provided, including a lens barrel, and a lens group and at least one spacing element accommodated within the lens barrel, where the lens group includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, each of the first to sixth lenses having a refractive power; and the at least one spacing element includes a third spacing element disposed between the third lens and the fourth lens; where, a radius of curvature R5 of an object-side surface of the third lens and a radius of curvature R6 of an image-side surface of the third lens satisfy: 1.5<R6/R5<2.0; and an effective focal length f3 of the third lens and an inner diameter d3s of an object-side surface of the third spacing element satisfy: 3.2<f3/d3s<4.2.