Six-Lens Imaging System for Compact High-Resolution Optics
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Solution Overview
Problem
Existing imaging lenses for portable devices, such as digital still cameras and smartphones, face challenges in achieving high imaging performance across central and peripheral angles of view while maintaining a short total length and accommodating larger imaging elements, which is essential for high-resolution images.
Innovation Solution
A six-lens configuration with specific refractive powers and shapes, including a first lens with positive power, a second lens with negative power, a third lens with positive power, a fourth lens with positive power, a fifth lens with negative power and an aspherical shape, and a sixth lens with negative power, optimized to satisfy conditional formulas for focal lengths and Abbe's numbers, ensuring a short total length and high imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to five or six lenses, then high resolution and imaging performance are achieved, but the total length of the imaging lens becomes large
Solution Approach 1:
The patent applies parameter changes by specifying precise focal length ratios (0.3 < f5/f < 1.0 and -0.5 < f6/f < -0.1) and Abbe's number constraints (20 < νd5 < 60) for the lens elements. These parameter optimizations enable the six-lens system to achieve high imaging performance while controlling the total length, resolving the contradiction between performance and compactness
Solution Approach 2:
The patent uses composite lens design combining six different lens elements with specific refractive powers and material properties (Abbe's numbers). This composite structure allows each lens to contribute differently to the overall optical performance, achieving high resolution while maintaining a compact form factor through optimized material selection and arrangement
2Area of stationary object
If the imaging lens is proportionately enlarged to correspond to a large imaging element, then the image size increases, but the total length becomes great
Solution Approach 1:
The patent transitions from scaling the entire lens system uniformly to optimizing individual lens element parameters independently. By controlling the focal length ratios and material properties of specific lenses rather than simply enlarging the whole system, the design achieves large image size compatible with large imaging elements while preventing proportional increase in total length
3Length of moving object
If the sixth lens has strong negative refractive power to shorten total length, then total length is reduced, but imaging performance deteriorates
Solution Approach 1:
The patent precisely controls the refractive power of the sixth lens through the constraint -0.5 < f6/f < -0.1, preventing it from being too strong. This parameter optimization ensures the sixth lens contributes to shortening total length without exceeding the threshold that would cause imaging performance deterioration, balancing both requirements
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 enables high-resolution images with improved optical performance across central and peripheral angles of view, achieving a balance between short total length and large image size, effectively addressing the limitations of existing lens designs.
Implementation Method 1
a sixth lens having a negative refractive power, which is of an aspherical shape with a surface which is concave toward an image side in the vicinity of an optical axis and convex toward the image side at the peripheral portion thereof
Implementation Method 2
a sixth lens having a negative refractive power, which is of an aspherical shape with a surface which is concave toward an image side in the vicinity of an optical axis and convex toward the image side at the peripheral portion thereof
Data Source
AI summary
An imaging lens substantially includes six lenses, constituted by: a first lens having a positive refractive power and a convex surface that faces an object side; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power and a concave surface that faces the object side; and an aspherical sixth lens having a negative refractive power, the surface of which is concave toward an image side in the vicinity of an optical axis and convex toward the image side at the peripheral portion thereof. The imaging lens satisfies a predetermined conditional formula.