Plastic Lens Assembly with Segmented Cementing Glue
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Solution Overview
Problem
The challenge in camera modules for portable electronic devices is to achieve higher manufacturing precision and improved optical design while maintaining light gathering quality across different fields of view, as existing technologies struggle to independently adjust the converging situation of imaging light from various fields of view without affecting central field light gathering.
Innovation Solution
A plastic lens assembly with at least two plastic lens elements and a cementing glue coating, where an optical gap is formed between the lens elements, and the cementing glue coating is positioned closer to the peripheral region, allowing for refractive index adjustment to optimize light passage and reduce flare, thereby improving light gathering resolution for specific fields of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cementing glue coating is applied between lens elements to improve manufacturing precision, then light gathering quality is improved, but flare is increased
Solution Approach 1:
The cementing glue coating is segmented into two distinct regions: a first cementing glue coating region with higher refractive index (1.60-1.70) and a second cementing glue coating region with lower refractive index (1.40-1.55). This segmentation allows different parts of the coating to perform different functions - the first region optimizes for light gathering while the second region minimizes flare, thereby resolving the contradiction between improving light gathering quality and reducing flare.
Solution Approach 2:
Different refractive index regions are applied to different locations within the cementing glue coating structure. The higher refractive index region is positioned to optimize central field light gathering, while the lower refractive index region is positioned to reduce flare from oblique angles. This local differentiation of optical properties allows simultaneous optimization of both light gathering and flare reduction.
2Manufacturing precision
If optical gap is formed between lens elements to adjust converging situation of imaging light, then light gathering resolution is improved, but manufacturing complexity increases
Solution Approach 1:
The optical gap structure is merged with the cementing glue coating structure to form an integrated optical assembly. The optical gap is positioned adjacent to the cementing glue coating regions, allowing the gap to adjust the converging situation of imaging light while the coating maintains light gathering quality. This merging reduces the need for separate adjustment mechanisms and simplifies manufacturing.
Solution Approach 2:
The width and position of the optical gap are optimized as design parameters to achieve the desired converging situation adjustment. By carefully controlling the gap dimensions and positioning it relative to the cementing glue coating regions, the patent achieves improved light gathering resolution through parameter optimization rather than complex structural changes.
3Ease of manufacture
If cementing glue coating with single refractive index is used to simplify manufacturing, then manufacturing precision is reduced, but light gathering quality is compromised
Solution Approach 1:
The cementing glue coating is divided into segments with different refractive indices applied in specific regions. This segmentation allows each region to be optimized for its specific function (light gathering or flare reduction) while maintaining overall manufacturing feasibility through a systematic coating process.
Solution Approach 2:
The patent uses composite cementing glue materials with different refractive indices in different regions of the coating. This composite approach combines the advantages of multiple materials (different refractive indices) to achieve superior optical performance while maintaining a unified coating structure that is manufacturable through established coating techniques.
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 configuration allows for independent adjustment of imaging light from farther fields of view without compromising central field light gathering quality, enhancing the light gathering resolution and reducing flare, thus improving the overall imaging performance.
Implementation Method 1
When a refractive index of the optical gap is Na, and a refractive index of the cementing glue coating is Ng, the following condition is satisfied: 0.52Na/Ng≤1.0.
Data Source
AI summary
A plastic lens assembly includes at least two plastic lens elements and at least one cementing glue coating. The plastic lens elements include a first plastic lens element and a second plastic lens element. The first plastic lens element has a first optical effective portion and a first peripheral portion, wherein the first peripheral portion surrounds the first optical effective portion. The second plastic lens element has a second optical effective portion and a second peripheral portion, wherein the second peripheral portion surrounds the second optical effective portion. The cementing glue coating is disposed between the first optical effective portion and the second optical effective portion, and for cementing the first plastic lens element and the second plastic lens element, wherein at least one optical gap is formed between the first optical effective portion and the second optical effective portion.