Optical Imaging Lens Spacing Element Layout for Stray Light Control
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Solution Overview
Problem
Wide-angle camera lens assemblies face challenges with large size, poor structural stability, and stray light due to a large field-of-view, which affects imaging quality and assembly stability.
Innovation Solution
An optical imaging lens assembly with a specific configuration of lenses and spacing elements, including a first lens with negative refractive power, a second lens with positive refractive power, and additional spacing elements to control stray light and improve structural stability, while maintaining a large wide-angle and long depth of field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the field-of-view is increased to achieve wide-angle imaging, then the picture background coverage is improved, but the structure part generates more stray light and the lens assembly size increases
Solution Approach 1:
The patent introduces a spacing element as an intermediary component between the lens and the image sensor. This spacing element includes a light blocking portion that intercepts stray light before it reaches the image sensor, thereby reducing the harmful effects of stray light while maintaining the wide field-of-view capability of the lens assembly
2Length of moving object
If the lens assembly is miniaturized to reduce axial length, then the thinness and lightness are improved, but the structural stability deteriorates
Solution Approach 1:
The patent segments the lens assembly into multiple components including the lens, spacing element, and light blocking portion. This segmentation allows each component to be optimized independently - the spacing element provides structural support and stability while the light blocking portion manages stray light, enabling miniaturization without compromising structural integrity
Solution Approach 2:
The spacing element serves multiple functions simultaneously: it maintains the axial spacing between the lens and image sensor, provides structural support for the miniaturized assembly, and incorporates a light blocking portion to reduce stray light. This multi-functionality enables the lens assembly to achieve compact size while maintaining structural stability
3Ease of manufacture
If the spacing element structure is simplified to reduce complexity, then the manufacturing is easier, but the stray light control and assembling stability deteriorate
Solution Approach 1:
The patent merges the spacing function and stray light blocking function into a single integrated spacing element. This unified structure simplifies manufacturing compared to having separate spacing and light blocking components, while still effectively controlling stray light through the incorporated light blocking portion
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 lens assembly achieves miniaturization, improved imaging quality, reduced stray light, and enhanced structural stability by effectively balancing aberrations and controlling light distribution, ensuring clear images with reduced risk of ghosting and assembly issues.
Implementation Method 1
a first lens having a negative refractive power
Implementation Method 2
a second lens having a positive refractive power, a third lens having a positive refractive power, a fifth lens having a positive refractive power and a sixth lens having a positive refractive power
Implementation Method 3
a plurality of spacing elements, comprising: a first spacing element that is placed between the first lens and the second lens
Data Source
AI summary
An optical imaging lens assembly is provided, including: an imaging lens group, a plurality of spacing elements, and a lens barrel configured to accommodate the imaging lens group and the plurality of spacing elements including a third spacing element that is placed between the third lens and the fourth lens and is in contact with an image-side surface of the third lens. Here, an inner diameter d3s of an object-side surface of the third spacing element, a radius of curvature R5 of an object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 5.0<d3s/(R5+R6)<10.5.