Four-Lens Imaging System Aberration Control
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Solution Overview
Problem
Current imaging lenses for digital and portable cameras face challenges in achieving high performance and compactness while maintaining ease of manufacture, as they often require complex aspheric surfaces that increase production costs and are insufficient in achieving both imaging performance and miniaturization.
Innovation Solution
A four-lens imaging lens configuration with specific refractive power and curvature settings, including a first lens with positive power, a second lens with negative power, a third lens with positive power, and a fourth meniscus lens with negative power, along with the use of aspherical surfaces, is designed to satisfy conditional expressions that minimize aberrations and enhance miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aspheric surfaces are used to enhance imaging performance and achieve miniaturization, then imaging performance and compactness are improved, but ease of manufacture deteriorates and cost increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the curvature radii of lens surfaces (both spherical and aspherical) and the thicknesses of lens components. By optimizing these geometric parameters within specific ranges, the lens achieves high imaging performance with aspheric surfaces while maintaining manufacturability. The conditional expressions in the patent directly govern these parameter relationships to balance performance and manufacturing feasibility.
2Reliability
If aspheric surfaces are used to correct aberrations and improve imaging quality, then imaging performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent manages manufacturing complexity by establishing specific parameter ranges for aspheric surface coefficients and curvature radii. The conditional expressions provide guidance on optimizing these parameters to achieve aberration correction without excessive manufacturing complexity. This systematic parameter control makes the complex aspheric lens design more manageable and cost-effective.
3Measurement precision
If the number of pixels in the imaging element is increased to achieve higher resolution, then imaging performance is improved, but the demand for lens miniaturization and performance enhancement increases
Solution Approach 1:
The patent utilizes spheroidality by incorporating aspheric surfaces with specific curvature characteristics into the lens design. The aspheric surfaces enable effective correction of aberrations and compact focusing within a small volume, which is essential for maintaining high resolution performance with increased pixel counts while achieving lens miniaturization. The conditional expressions on curvature radii directly support this curvature-based optimization.
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 configuration ensures high imaging performance with reduced aberrations, miniaturization, and cost-effectiveness by controlling longitudinal chromatic aberration and high-order aberrations, while allowing for the use of optical glass and resin materials to reduce weight and complexity.
Implementation Method 1
a first lens having a positive refractive power and having a convex surface on the object side; a second lens having a negative refractive power and having a concave surface on the object side; a third lens having a positive refractive power; and a fourth lens of a meniscus lens having a negative refractive power
Data Source
AI summary
An imaging lens is provided and includes: in order from an object side of the imaging lens, a first lens having a positive refractive power and having a convex surface on the object side; a second lens having a negative refractive power and having a concave surface on the object side; a third lens having a positive refractive power in the vicinity of an optical axis thereof; and a fourth lens of a meniscus lens having a negative refractive power and having a convex surface on the object side, the imaging lens satisfying the specific conditional expressions.