Mobile Imaging Lens Design with Aspherical Surfaces
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Solution Overview
Problem
Conventional imaging devices for mobile devices face challenges in achieving high performance and high transmittance while maintaining a small size, as increasing the lens space or aperture size complicates manufacturing and reduces aberration control.
Innovation Solution
The imaging device is designed with a specific configuration of lenses, including a first lens with positive or negative refractive power, a second lens with a concave object side, a third lens with aspherical surfaces, and a fourth lens with aspherical surfaces, arranged in sequence, meeting specific conditional expressions to optimize focal lengths, aperture sizes, and refractive indices, which allows for high performance without increasing lens space or aperture size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lens space height is increased to achieve high performance and high transmittance, then the aperture of the entrance pupil is increased, but the clearance space behind the lens is reduced and the device size becomes unsuitable for mobile devices
Solution Approach 1:
The patent employs aspherical surfaces on multiple lens elements (specifically the third and fourth lenses have aspherical object sides, and the fourth lens has an aspherical imaging side). This curvature optimization allows for improved light gathering efficiency and transmittance without requiring increased lens space height, thereby maintaining compact device dimensions suitable for mobile applications while achieving high performance
Solution Approach 2:
The patent optimizes specific parameter ranges including the focal length (f) between 2.0-3.0mm, the F-number (f/D) ≤ 2.6, and the back focal length (FBL) between 0.8-1.5mm. These parameter changes enable high transmittance and performance within a constrained volume by precisely controlling optical path efficiency rather than increasing physical dimensions
2Measurement precision
If the pixel size of the image sensor is decreased to increase resolution, then high performance and high transmittance are required, but conventional designs cannot achieve both without increasing lens space
Solution Approach 1:
The aspherical surfaces on the third and fourth lenses enable effective light collection from smaller pixels by correcting spherical aberration and improving focal point precision. This allows high resolution imaging from decreased pixel sizes while maintaining high transmittance through optimized optical path efficiency, without requiring increased lens space
Solution Approach 2:
The patent divides the optical system into four distinct lens elements with specific refractive powers and surface characteristics. This segmentation allows each lens to be optimized for specific functions (collimation, focusing, aberration correction) enabling high performance with small pixels while maintaining compact overall dimensions
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 enables the production of high-resolution imaging devices suitable for mobile use with improved performance and transmittance, maintaining a compact size by optimizing lens arrangements and refractive indices, thus addressing the limitations of conventional designs.
Implementation Method 1
a first lens (110) having a positive or negative refractive power; a second lens (120) having a positive or negative refractive power
Data Source
AI summary
Provided is an imaging device for mobile devices such as a mobile phone, using a high resolution image sensor such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS).