Compact Imaging Lens Assembly with Aperture Stop Between Elements
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Solution Overview
Problem
Conventional compact imaging lenses face challenges in reducing total track length while maintaining high image quality and controlling system sensitivity, especially with the increasing demand for smaller and more powerful camera modules.
Innovation Solution
A compact imaging lens assembly comprising two lens elements with specific refractive powers and aspheric surfaces, where a first lens element with positive refractive power and a second lens element with negative refractive power are arranged with an aperture stop between them, optimizing distances and curvatures to reduce system length and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-lens element structure is used for aberration correction, then image quality is improved, but total track length increases and manufacturing complexity increases
Solution Approach 1:
The patent extracts the aperture stop from the conventional three-lens structure and positions it between the first and second lens elements. This reconfiguration allows the system to achieve aberration correction with only two lens elements, reducing total track length while maintaining manufacturing precision through the strategic placement of the aperture stop to control light paths and reduce unwanted reflections.
Solution Approach 2:
The patent changes the refractive power parameters of the two lens elements, with the first lens element having positive refractive power and the second having negative refractive power. This parameter configuration, combined with the aperture stop placement, enables effective aberration correction while maintaining a compact total track length suitable for mobile device applications.
2Volume of moving object
If the lens assembly is reduced in size, then compactness is improved, but imaging space decreases and lens thickness decreases causing material unevenness
Solution Approach 1:
The patent segments the optical system into two distinct lens elements with different refractive powers (positive and negative) rather than using a single thick lens. This segmentation allows each element to be thinner and more manageable, reducing material unevenness during injection molding while maintaining the compact overall assembly size required for mobile devices.
Solution Approach 2:
The patent changes the material parameter distribution by using two separate lens elements with optimized individual thicknesses rather than one thick element. This allows each element to have more uniform material distribution during manufacturing, improving molding yield while achieving the compact form factor needed for modern camera modules.
3Manufacturing precision
If a frontal aperture stop is used to correct aberrations, then aberration correction is improved, but system sensitivity increases due to unwanted light entry
Solution Approach 1:
The patent introduces the aperture stop as an intermediary element positioned between the first and second lens elements. This intermediary structure effectively controls and limits unwanted light entry and reflections that would otherwise increase system sensitivity, while still providing the necessary aberration correction functionality through its strategic placement in the optical path.
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 effectively reduces the total track length, lowers system sensitivity, and achieves high image quality by balancing lens size and sensitivity, while allowing for efficient manufacturing and aberration correction.
Implementation Method 1
a first lens element with positive refractive power
Implementation Method 2
a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface
Data Source
AI summary
This invention provides a compact imaging lens assembly in order from an object side toward an image side including a first lens with positive refractive power having at least one of the object-side and image-side surfaces thereof being aspheric, a second lens with negative refractive power having a concave object-side surface and a concave image-side surface with at least one of both surfaces thereof being aspheric, and an aperture stop positioned between the first lens element and the second lens element. There are two lens elements with refractive power in the compact imaging lens assembly.