Six-Lens Optical Layout for Close-Range Distortion Correction
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Solution Overview
Problem
Optical imaging systems mounted on the front surface of portable terminals often suffer from optical distortion phenomena such as 'cone-head' when imaging subjects at a relatively short distance.
Innovation Solution
An optical imaging system comprising six lenses with specific refractive powers and surface configurations, including concave and convex surfaces, and aspherical shapes, designed to minimize optical distortions and enhance imaging performance for close-range subjects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical imaging systems are used for short-distance imaging, then imaging capability is provided, but optical distortion such as cone-head distortion occurs
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, surface curvatures, and spacing of multiple lens elements. Specifically, the first lens has negative refractive power with a concave object-side surface, the second lens has positive refractive power, and subsequent lenses have carefully designed parameters that satisfy specific conditional expressions. These parameter optimizations correct optical distortions while maintaining imaging capability.
Solution Approach 2:
The patent uses a composite lens system comprising six different lens elements with varying refractive powers and material properties. Each lens element is designed with specific refractive index and dispersion characteristics to work together as a composite optical system, enabling distortion correction that cannot be achieved with single-element lenses.
2Volume of moving object
If optical imaging systems are miniaturized for portable terminals, then device size is reduced, but optical performance and distortion control become more difficult
Solution Approach 1:
The patent employs a compact six-lens configuration where lens elements are closely spaced and nested within a minimized optical path length. The conditional expressions ensure that the ratio of total track length to image height remains within specific ranges, enabling miniaturization while maintaining optical performance. The inflection point design on the sixth lens further contributes to compact form factor.
Solution Approach 2:
The patent utilizes aspherical surfaces on multiple lens elements, including the first lens with a concave object-side surface and the sixth lens with an inflection point on its image-side surface. These curved surface designs enable better light control in a compact configuration, improving image quality while reducing overall system size compared to conventional spherical lens designs.
3Adaptability or versatility
If wide-angle lenses are used for short-distance imaging, then field of view is increased, but distortion phenomena are exacerbated
Solution Approach 1:
The patent applies local quality by assigning different refractive power signs and surface curvature characteristics to different lens elements. The first lens has negative refractive power to control peripheral light rays, while the second lens has positive refractive power for central light control. This localized optimization of optical properties across different parts of the optical system enables wide-field imaging with reduced distortion.
Solution Approach 2:
The six-lens optical system is designed to perform multiple functions simultaneously: it provides wide-angle field of view, corrects optical distortions, enables short-distance focusing, and maintains compact size. The conditional expressions ensure that the system satisfies multiple optical performance requirements at once, making it universally applicable for portable terminal cameras that require short-distance imaging capability.
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 system effectively reduces wide-angle distortion and enables high-resolution imaging for subjects at short distances, while maintaining a compact design.
Implementation Method 1
a first lens L1 having a negative refractive power and a concave object-side surface, a second lens L2 having a convex image-side surface
Data Source
AI summary
There is provided an optical imaging system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens includes a negative refractive power and a concave object-side surface. The second lens includes a concave object-side surface. The fourth lens includes a negative refractive power. The sixth lens includes an inflection point formed on an image-side surface thereof. The first to sixth lenses are sequentially disposed from an object side toward an imaging plane.