Imaging Lens Design for Chromatic Aberration Correction
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Solution Overview
Problem
Conventional imaging lenses face challenges in correcting chromatic aberrations and widening the angle of view, as seen in existing lens designs that either struggle with chromatic aberration correction or have limitations in expanding the field of view due to specific lens configurations.
Innovation Solution
The proposed imaging lens design consists of a first lens group with a positive refractive power and a second lens group, where focusing is achieved by moving the entire second lens group along the optical axis, with specific lens configurations and Abbe number ratios that allow for effective chromatic aberration correction and angle of view expansion, including the use of meniscus lenses and cemented lenses to optimize refractive power and curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If three positive meniscus lenses are used in the first lens group, then the lens structure is simplified, but the angle of view cannot be widened
Solution Approach 1:
The patent applies local quality by using different lens types (positive and negative meniscus lenses) at specific positions within the first lens group. The negative meniscus lenses are strategically placed to widen the angle of view while positive meniscus lenses maintain structural simplicity, creating localized functional differences that resolve the contradiction between simplified structure and wide angle of view.
Solution Approach 2:
The patent employs asymmetry by configuring the first lens group with a non-uniform arrangement of positive and negative meniscus lenses rather than using identical lens types. This asymmetric configuration allows the lens group to achieve both structural simplicity and wide angle of view capability, as the different lens types compensate for each other's limitations in specific positions.
2Ease of manufacture
If conventional lens configurations are used, then manufacturing is easier, but chromatic aberrations cannot be corrected satisfactorily
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the Abbe numbers of the lenses in the first lens group. By specifying that the Abbe number of the negative meniscus lenses differs from that of the positive meniscus lenses, the patent achieves effective chromatic aberration correction while maintaining relatively simple manufacturing processes for standard meniscus lens shapes.
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 design effectively corrects chromatic aberrations and widens the angle of view, enabling the production of high-quality images by optimizing lens configurations and material selection based on Abbe numbers and refractive indices.
Implementation Method 1
The imaging lens comprises a first lens group having a positive refractive power and a second lens group having a positive refractive power in this order from the object side, wherein the first lens group comprises a positive first lens, a negative second lens, a negative third lens, a positive fourth lens, and a positive fifth lens
Implementation Method 2
the imaging lens satisfies conditional formula (1): 2.0 < vd2/vd3, where vd2: the Abbe number of the second lens with respect to the d-line, and vd3: the Abbe number of the third lens with respect to the d-line
Data Source
AI summary
Disclosed is an imaging lens substantially consisting of a first lens group having a positive refractive power and a second lens group having a positive refractive power, arranged in this order from the object side. Focusing is performed by moving the entire second lens group along the optical axis. The most-image-side lens of the first lens group, a lens which is second from a most-image side in the first lens group, and a lens which is third from the most-image side in the first lens group are all meniscus lenses with convex surfaces toward the image side. The imaging lens satisfies the formula: 1.0<FA/FB<8.0, where FA is the focal length of the first lens group, and FB is the focal length of the second lens group.