Five-Lens Imaging Module with Composite Lens for Aberration Control
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Solution Overview
Problem
Existing imaging lens modules for digital carriers, such as mobile phones and cameras, face challenges in achieving high imaging quality due to excessive color difference and aberration, which are exacerbated by the need for miniaturization, leading to limitations in space and quality.
Innovation Solution
A five-lens imaging lens module is designed with glass or plastic aspheric surfaces, including a fixed diaphragm and specific lens configurations to compensate for color differences and correct aberrations, featuring a negative first lens, positive second lens, negative meniscus third lens, positive fourth lens composite, and positive fifth lens, with aspheric surfaces and optimized focal length ratios to enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a lens module composed of 3 or 4 lenses is used, then the structure is compact and suitable for miniaturized digital carriers, but the imaging quality deteriorates due to excessively large color difference and aberration
Solution Approach 1:
The patent combines the third and fourth lenses into a composite lens structure where the two lenses are adhered together. This merging approach allows the composite lens to simultaneously correct multiple types of aberrations (spherical aberration, coma, astigmatism) that would be difficult to correct with individual lenses, thereby improving imaging quality without significantly increasing the overall module size
Solution Approach 2:
The patent uses different materials for the third and fourth lenses (with specific Abbe number and refractive index requirements) to create a composite lens that addresses color difference and chromatic aberration. The material selection and combination enable effective correction of wavelength-dependent optical errors while maintaining a compact form factor
2Manufacturing precision
If the optical length is increased to maintain high imaging quality, then the imaging quality is improved, but the space availability in small electronic carriers deteriorates
Solution Approach 1:
The patent employs aspheric surfaces on multiple lenses (first, second, third, fourth, and fifth lenses) with specific aspheric coefficient constraints. These curved surfaces enable more efficient light path control and aberration correction within a shorter optical length, allowing high imaging quality to be achieved without proportionally increasing the overall module length
Solution Approach 2:
The patent optimizes multiple optical parameters including focal lengths, radii of curvature, and spacing between lenses to achieve compact dimensions. By carefully adjusting these parameters and their relationships (expressed through specific formulas in the patent), the design achieves high imaging quality with reduced optical length compared to conventional designs
3Manufacturing precision
If more lenses are added to correct aberration and color difference, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The patent merges the third and fourth lenses into an adhered composite lens structure, reducing the total lens count from five separate elements to four assembled elements. This merging maintains the aberration correction capabilities of multiple lenses while simplifying the overall structure and reducing alignment complexity compared to using five independent lenses
Solution Approach 2:
The composite lens structure performs multiple functions simultaneously: the third and fourth lenses together correct spherical aberration, coma, and astigmatism, while also addressing chromatic aberration through material selection. This multi-functionality reduces the need for additional dedicated correction lenses, thereby simplifying the overall device structure
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 achieves high-quality imaging with reduced color difference and aberration, enabling a wider angle of viewing and higher resolution while maintaining a compact size, thus addressing the limitations of prior art in achieving high-end lens performance within space constraints.
Implementation Method 1
the first lens, having a negative refractive power, a convex surface disposed towards the object side, and a concave surface disposed towards the image side
Implementation Method 2
compensate the color difference by adhering the lenses
Data Source
AI summary
An imaging lens module includes a fixed diaphragm and an optical module. The optical module includes first, second, third, fourth and fifth lenses arranged from an object side to an image side in a sequence of: the first lens, having a negative refractive power, a convex surface disposed towards the object side, and a concave surface disposed towards the image side; the diaphragm; the second lens having a positive refractive power and a convex lens disposed towards the image side; and the third lens; being a meniscus negative lens; the fourth lens, being a positive lens, and adhered with the third lens to form a composite lens; the fifth lens, having a positive refractive power, such that the imaging lens module is a lens module with the features of high imaging quality and high yield rate.