Optical Unit Flat Intermediate Layer Lens Precision
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Solution Overview
Problem
Current lens systems in camera modules, particularly in mobile telephones, face challenges in achieving the required shape precision without increasing the dimensions of the optical unit, as they demand more resolution and optical functionalities within smaller dimensions.
Innovation Solution
Incorporating a flat, transparent intermediate layer made of glass, which influences light rays and index transitions, allowing for the use of less deep lenses, and employing a replication method to form lenses with predictable curvature, along with specific lens element configurations and adhesives for precise bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lenses with greater sag height are used to achieve higher resolution and optical functionalities, then optical performance is improved, but manufacturing precision becomes more difficult to realise
Solution Approach 1:
A flat, transparent intermediate layer is introduced between the first substrate and the first lens element, and between the second substrate and the second lens element. This intermediate layer serves as a mediator that simplifies the manufacturing process by providing a stable base for lens formation, thereby achieving required shape precision without increasing production complexity
Solution Approach 2:
The optical unit is divided into separate components: first substrate, intermediate layer, first lens element, second substrate, and second lens element. This segmentation allows each component to be manufactured and adjusted independently, improving overall shape precision while maintaining manageable production complexity
2Manufacturing precision
If lenses with greater sag height are used to achieve higher resolution, then optical performance is improved, but the dimensions of the optical unit increase
Solution Approach 1:
The flat intermediate layer acts as a mediator that enables the use of less deep lenses by providing optical path adjustment through its thickness and refractive index properties, thereby achieving required shape precision while maintaining compact dimensions
Solution Approach 2:
The refractive index of the intermediate layer is optimized to adjust the optical path length, allowing for reduced lens sag height while maintaining imaging performance. This parameter change enables compact dimensions without sacrificing optical precision
3Manufacturing precision
If more deep lenses are used to achieve required shape precision, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The intermediate layer serves as a manufacturing intermediary that simplifies the process of achieving precise lens shapes. By providing a stable, flat base layer, it enables easier formation of lenses with required precision without increasing overall device complexity
Solution Approach 2:
The intermediate layer is prepared in advance as a flat, transparent substrate before lens elements are formed or attached. This preliminary action creates a stable foundation that simplifies subsequent manufacturing steps and improves ease of production
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
This approach enables the manufacture of lens systems with improved shape precision and optical performance, maintaining compact dimensions while achieving visually acceptable images, suitable for high-resolution applications in small form factors like mobile telephones and digital cameras.
Implementation Method 1
it influences the course of the light rays through the thickness of the intermediate layer itself and the index transition between air and the refractive index of the material of the intermediate layer itself
Data Source
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AI summary
The present invention relates to a optical unit. The present invention further relates to the use of such an optical unit. Such an optical unit comprises, seen in a direction from the object side to the imaging surface, a first substrate, a first lens element, a flat, transparent intermediate layer, a second lens element and a second substrate, which intermediate layer has an optically correcting function near the imaging surface.