Zoom Lens System Compact Size Aberration Correction
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Solution Overview
Problem
The demand for high optical performance and compact size in zoom lens systems for digital and surveillance cameras is increasing, particularly for capturing high-resolution images both during the day and at night, while existing systems face challenges in achieving these requirements due to size constraints and aberration correction across visible and near-infrared ranges.
Innovation Solution
A two-group zoom lens system is designed with a first lens group having negative refractive power and a second lens group with positive refractive power, where the second lens group moves along the optical axis for zooming and the first lens group moves for focusing, incorporating specific lens configurations and a near-infrared light blocking filter to achieve compact size and aberration correction from visible to near-infrared ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a zoom lens system is designed to capture high-resolution images from visible to near-infrared ranges, then optical performance is improved, but the system size increases
Solution Approach 1:
The lens system is divided into two functional groups: a first lens group with negative refractive power and a second lens group with positive refractive power. This segmentation allows each group to be optimized for specific functions (focusing and zooming respectively), achieving high optical performance across visible and near-infrared ranges while maintaining a compact overall structure through specialized arrangement of these segments
Solution Approach 2:
The patent applies parameter changes by selecting specific refractive indices and Abbe numbers for lens materials to correct chromatic aberrations across the visible to near-infrared spectrum. By carefully controlling optical parameters (refractive power, focal lengths, spacing) of the two lens groups, the system achieves high optical performance without proportionally increasing size
2Volume of moving object
If the lens system is designed to be compact, then the volume is reduced, but aberration correction across visible and near-infrared ranges becomes difficult
Solution Approach 1:
The patent applies local quality by assigning specific optical properties to different parts of the system: the first lens group uses materials with specific refractive indices and Abbe numbers optimized for chromatic aberration correction, while the second lens group is configured for zooming functionality. This localized optimization of material and structural properties enables effective aberration correction across the spectrum within a compact form factor
Solution Approach 2:
The lens system employs composite material selection with multiple lens elements having different refractive indices and Abbe numbers (including near-infrared transmission properties). This composite approach combines materials with complementary optical characteristics to achieve broad-spectrum aberration correction in a compact configuration
3Adaptability or versatility
If high magnification is achieved, then the focal length increases, but the lens system becomes larger and heavier
Solution Approach 1:
The patent implements dynamics by making the second lens group (with positive refractive power) movable along the optical axis to perform zooming. This dynamic configuration allows the system to vary focal length and achieve different magnification levels without requiring a proportionally larger physical structure, enabling high magnification capability in a compact form
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 captures high-resolution images across both visible and near-infrared ranges, maintaining compact size and high optical performance, enabling efficient zooming and focusing while correcting chromatic aberrations, thus meeting the demands for high-magnification and compact lens systems.
Implementation Method 1
a first lens group G1 having a negative refractive power and a second lens group G2 having a positive refractive power, wherein the first lens group and the second lens group are sequentially arranged from an object side to an image side
Implementation Method 2
correcting aberrations from a visible ray range to a near infrared range
Implementation Method 3
The zoom lens system may further include a near infrared light blocking filter between the first lens group and the second lens group
Data Source
AI summary
A zoom lens system includes: a first lens group having a negative refractive power; a second lens group having a positive refractive power; and an aperture between the first and second lens groups, wherein the first lens group and the second lens group are sequentially arranged from an object side to an image side, wherein the zoom lens system performs zooming and focusing by moving the second and first lens groups, respectively, along an optical axis, and satisfies2.5<(fw/ft)×(Tw/Y)<4.5,where fw denotes an entire focal length at a wide-angle end, ft denotes an entire focal length at a telephoto end, and Tw denotes a distance between an image plane and an object side lens surface of a lens closest to the object side of the first lens group at the wide-angle end, and Y denotes a radical axis image height.