Zoom Lens With Three Groups For High Rate And Wide Aperture
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Solution Overview
Problem
Existing zoom lenses have limited zooming rates, are restricted to smaller apertures, and cannot achieve stereoscopy, limiting their imaging quality and versatility.
Innovation Solution
A zoom lens design comprising a first, second, and third lens group with specific refractive indices and thickness ratios, along with aspherical or free-form surfaces, allowing for a larger zooming range and wider aperture compatibility, including a stop between the first and second lens groups and an imaging surface with a filter for infrared ray filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing zoom lens designs are used, then the structure is simple and easy to manufacture, but the zooming rate is restricted to under 2.3 and aperture is limited to smaller values
Solution Approach 1:
The zoom lens is divided into three distinct lens groups (first, second, and third lens groups) with specific positive and negative diopter powers. Each group contains multiple lenses with specific refraction indices and thickness ratios, allowing independent optimization of each group's function to achieve both high zooming rate and wide aperture capability
Solution Approach 2:
The patent specifies precise parameter ranges including refraction indices (NdA, NdB), thickness ratios (GD2/GD1 between 0.4-1.6), and diopter power relationships. By optimizing these parameters within defined ranges, the lens achieves a zooming rate exceeding 2.3 while maintaining wide aperture performance and correcting aberrations
2Manufacturing precision
If existing zoom lens designs are used, then manufacturing is straightforward, but imaging quality for stereoscopy and wide aperture exposure cannot be achieved
Solution Approach 1:
Different lens groups and individual lenses within groups are assigned specific properties: the first lens group has positive diopter power with specific refraction index NdA, the second has negative diopter power with refraction index NdB, and the third has positive diopter power. Each group is optimized for specific functions (zooming, focusing, aberration correction) to achieve high imaging quality
Solution Approach 2:
The patent employs multiple lens materials with different refraction indices (NdA for first group, NdB for second group) and combines them in specific configurations. This composite approach allows simultaneous optimization of multiple optical properties including zooming rate, aperture capability, and aberration control
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 design achieves a zooming rate greater than 2.3, supports wider apertures, and maintains optimal imaging quality by controlling longitudinal spherical aberration, field curvature, and distortion within specified ranges across the zooming spectrum.
Implementation Method 1
NdA is a refraction index of the first lens group. NdB is a refraction index of the second lens group
Implementation Method 2
an imaging surface with a filter for infrared ray filtration
Data Source
AI summary
A zoom lens is provided. The zoom lens includes a first lens group, a second lens group and a third lens group. The first lens group includes at least one lens. The second lens group includes at least one lens. The first lens group, the second lens group and the third lens group are arranged in order from an object side to an image side. The zoom lens satisfies following conditions: NdA<1.65, NdB<1.65, and GD2/GD1<1.35. NdA is a refraction index of the first lens group. NdB is a refraction index of the second lens group. GD1 is a thickness of the first lens group along an optical axis. GD2 is a thickness of the second lens group along an optical axis.