Optical Imaging Lens Spacer Assembly With Light-Shielding Sheet
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Solution Overview
Problem
Existing optical imaging lenses face issues with stray light entering the interior due to reflections from the spacer's inner diameter surface, which affects optical quality, and expanding the spacer's inner diameter is limited by manufacturability and supportability concerns.
Innovation Solution
A spacer assembly comprising a front spacer, a rear spacer, and a middle light-shielding sheet, with specific mechanical surface area ratios and configurations to absorb unnecessary light, ensuring good optical quality and manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the inner diameter of the spacer is expanded to reduce stray light, then the optical quality is improved, but the manufacturability and supportability of the spacer deteriorate
Solution Approach 1:
The spacer is divided into multiple segments (first spacer, second spacer, third spacer) with different inner diameter configurations. Each segment handles stray light differently, allowing the system to achieve effective stray light reduction without requiring any single spacer to have an excessively large inner diameter that would compromise manufacturability.
Solution Approach 2:
Different portions of the spacer system have different inner diameter characteristics. The first spacer has a first inner diameter, the second spacer has a second inner diameter, and the third spacer has a third inner diameter. This local variation allows optimization of stray light reduction in critical areas while maintaining manufacturability in other areas.
2Object-affected harmful factors
If the shape of the inner diameter surface is changed (from inclined to curved) to guide light, then the optical quality is improved, but the complexity of the spacer structure increases
Solution Approach 1:
The spacer system is segmented into multiple components with different surface configurations. Some spacers have inclined inner diameter surfaces while others have curved surfaces. This segmentation allows the system to achieve effective stray light guidance without requiring every spacer to have complex curved surfaces, thereby reducing overall manufacturing complexity.
Solution Approach 2:
Instead of making all spacers have complex curved surfaces to guide light, the invention uses a combination of simple inclined surfaces and curved surfaces. The light-shielding sheet positioned between spacers provides an additional mechanism for stray light control, allowing simpler spacer geometries to be used while still achieving the desired optical performance.
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 spacer assembly effectively reduces stray light entry while maintaining structural integrity and manufacturability, enhancing optical imaging quality and reducing production costs.
Implementation Method 1
adapted to absorb unnecessary light
Data Source
AI summary
A spacer assembly suitable of being applied in an optical imaging lens is provided. The spacer assembly includes a front spacer, a rear spacer, and a middle light-shielding sheet. The front spacer, the middle light-shielding sheet, and the rear spacer are sequentially arranged from an object side to an image side. Each of the front spacer and the rear spacer has an object-side mechanical surface facing the object side and an image-side mechanical surface facing the image side. The object-side mechanical surface of the rear spacer bears on the middle light-shielding sheet.