Seven-Lens Camera Assembly Using Spacers to Suppress Stray Light
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Solution Overview
Problem
Wide-angle lens assemblies in cell phone cameras suffer from stray light issues that affect image quality, and there is a need to improve the design to minimize these effects while maintaining high performance and compact size.
Innovation Solution
The optical camera lens assembly includes a specific configuration of lenses with negative refractive powers and surface types, along with strategically placed spacing elements to control aberrations and reduce stray light, ensuring smooth light convergence and divergence, and is housed in a lens barrel for stability and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide-angle lens assembly is designed to achieve a large field-of-view, then the field-of-view is improved, but stray light appears at more angles affecting image quality
Solution Approach 1:
The patent introduces multiple spacing elements (first spacing element, second spacing element, third spacing element) as intermediary components between the lenses. These spacing elements are positioned at specific locations (between first and second lens, between second and third lens, between fourth and fifth lens) to intercept and block stray light paths without interfering with the main optical path, thereby resolving the contradiction between wide field-of-view and stray light control
Solution Approach 2:
The patent divides the optical system into multiple lens groups with specific refractive power distributions (positive and negative lenses arranged in sequences). By segmenting the lens assembly into distinct functional groups (first lens group with positive power, second lens group with negative power, etc.), the patent can control light paths at different stages to prevent stray light while maintaining wide field-of-view capability
2Manufacturing precision
If multiple lenses are added to control aberrations and reduce stray light, then imaging quality is improved, but the lens assembly size increases
Solution Approach 1:
The patent employs a nested arrangement where multiple lenses are closely spaced and integrated within a compact lens barrel. The spacing elements are positioned tightly between lenses, and the entire assembly is housed in a confined space, achieving a nested structure that accommodates multiple optical components without proportionally increasing the overall volume
Solution Approach 2:
The patent utilizes the axial dimension (optical axis direction) to arrange multiple lenses and spacing elements in a compact sequence. By optimizing the axial spacing between lenses and using thin spacing elements, the patent packs multiple components into a short axial length, effectively controlling the lens assembly size while maintaining the necessary number of elements for imaging quality
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 effectively reduces stray light, improves imaging quality, and maintains a compact size, enhancing the performance of wide-angle lens assemblies in cell phone cameras.
Implementation Method 1
an imaging lens group, along an optical axis from an object side to an image side sequentially including: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, where at least one of the first lens to the fourth lens has a negative refractive power
Data Source
AI summary
An optical camera lens assembly comprising seven lenses, where at least one of the first lens to the fourth lens has a negative refractive power; a plurality of spacing elements, comprising a first spacing element disposed on an image-side surface of the first lens and a second spacing element disposed on an image-side surface of the second lens; and a lens barrel, for accommodating the imaging lens group and the plurality of spacing elements; where, radii of curvature of the object-side (R1) and image-side (R2) surfaces of the first lens, and a radius of curvature R3 of an object-side surface of the second lens satisfy: R2/R3>R1/R2>0; and an inner diameter d1s of an object-side surface of the first spacing element, a center thickness CT1 of the first lens, an outer diameter D2m of an image-side surface of the second spacing element, and an air spacing T23 satisfy: 9<d1s/CT1+D2m/T23<26.