Imaging Lens Power Structure for Aberration Correction
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Solution Overview
Problem
Existing camera modules with high-resolution imaging lenses fail to demonstrate satisfactory optical and aberration characteristics due to their power structure, necessitating a new power structure for improved performance.
Innovation Solution
The proposed imaging lens configuration includes a first positive lens, a second negative lens, a third lens with aspheric surfaces, a fourth meniscus-shaped lens, and a fifth negative meniscus-shaped lens, with specific refractive index and Abbe number conditions to optimize focal length and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional power structure with 5 pieces of lenses (PNNPN or PNPNN) is used, then the imaging lens can be constructed with a standard configuration, but the optical characteristics and aberration characteristics are not satisfactory
Solution Approach 1:
The patent changes the power structure parameters from conventional PNNPN or PNPNN configurations to a new PPPNN structure, where the first three lenses have positive refractive power and the last two have negative refractive power. This parameter change in the power distribution enables satisfactory optical and aberration characteristics while maintaining the 5-lens configuration.
2Ease of manufacture
If the first lens has a convex surface on the object side, then the lens configuration is simplified, but achieving high resolution and aberration correction becomes difficult
Solution Approach 1:
The patent employs a composite lens system where the first lens combines a convex object-side surface with specific refractive power, and subsequent lenses with varying shapes (concave, meniscus) and refractive powers work together. This composite approach enables both ease of manufacture and high precision aberration correction.
3Reliability
If aspheric surfaces are used on the third lens, then aberration correction is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies aspheric surfaces specifically to the third lens rather than all lenses, targeting the local area where aberration correction is most needed. This selective application of aspheric surfaces provides effective aberration control while minimizing overall manufacturing complexity.
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 enhances the resolution and aberration characteristics of the imaging lens, providing superior optical performance by correcting spherical and chromatic aberrations, as demonstrated by the compliance with specified conditions and graphical aberration correction results.
Implementation Method 1
an imaging lens producing an image... a first lens of a positive lens having a convex surface on the object side thereof; a second lens of a negative lens having a concave surface on the image side thereof
Implementation Method 2
a third lens having aspheric faces at both an object side surface and an image side surface... correcting spherical and chromatic aberrations
Implementation Method 3
correcting spherical and chromatic aberrations, as demonstrated by the compliance with specified conditions and graphical aberration correction results
Data Source
AI summary
Provided is an imaging lens and a camera module, the device including in an orderly way from an object side, a first lens with positive (+) refractive power; a second lens with negative (−) refractive power; a third lens with negative (−) refractive power; a fourth lens with negative (−) refractive power; and a fifth lens with negative (−) refractive power, wherein the lens is concavely formed at an object side surface.