Compact Zoom Lens Design with Biconcave First Group
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Solution Overview
Problem
The challenge is to develop a small and low-priced zoom lens with high zoom magnification for photographing devices like digital cameras and camcorders, where achieving miniaturization, high optical performance, and low manufacturing costs simultaneously is difficult due to the need for high magnification and the use of highly refractive aspherical lenses.
Innovation Solution
A zoom lens design comprising a first biconcave lens group, a second aspherical lens group, and a third meniscus lens group, with specific refractive power and curvature relationships, along with software correction for distortion, to achieve compactness and cost-effectiveness while maintaining high zoom magnification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If highly refractive aspherical lenses are used to achieve high zoom magnification, then optical performance is improved, but manufacturing costs increase
Solution Approach 1:
The patent changes the refractive index parameter of the lens materials used in the lens groups. By selecting specific refractive index ranges (e.g., 1.8 or greater for the first lens, 1.9≦N2≦2.2 for the second lens), the design achieves high optical performance without necessarily requiring expensive aspherical surfaces, thus resolving the contradiction between optical performance and manufacturing cost.
2Reliability
If high zoom magnification is achieved, then optical performance is improved, but lens size increases
Solution Approach 1:
The patent employs specific parameter ranges for lens intervals and focal lengths to achieve high zoom magnification in a compact form. By controlling the interval between lens groups and using specific focal length ratios (fw and ft), the design accomplishes high magnification without proportionally increasing overall lens volume.
3Volume of moving object
If miniaturization is pursued, then device size is reduced, but achieving high magnification becomes difficult
Solution Approach 1:
The patent divides the zoom lens into multiple lens groups (first lens group with negative refractive power, second lens group with positive refractive power, and third lens group with positive refractive power). This segmentation allows each group to perform specific functions, enabling high zoom magnification to be achieved within a miniaturized structure by optimizing the movement and configuration of individual groups rather than relying on a single large lens system.
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 allows for a compact, cost-effective zoom lens with high zoom magnification, minimizing manufacturing costs and optical aberrations, and enabling the production of small, low-priced optical apparatuses with improved performance.
Implementation Method 1
a first lens group having a negative refractive power; a second lens group having a positive refractive power; and a third lens group having a positive refractive power, which are sequentially arranged in a direction from an object side to an image side
Data Source
AI summary
A zoom lens and a photographing device including the zoom lens. The zoom lens includes: a first lens group having a negative refractive power; a second lens group having a positive refractive power; and a third lens group having a positive refractive power, which are sequentially arranged in a direction from an object side to an image side, wherein the first lens group comprises a first lens that is biconcave and is closest to the object side. Accordingly, a compact and low-priced zoom lens having a high magnification may be manufactured.