Unlock instant, AI-driven research and patent intelligence for your innovation.
a lens
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A lens, lens technology, applied in the field of lenses, can solve the problem of inability to take into account the requirements of large field of view, large diameter, long focal length, high resolution and close object distance
Active Publication Date: 2022-02-15
ZHEJIANG DAHUA TECH CO LTD
View PDF11 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0004] The embodiment of the present invention provides a lens to solve the problem that the current machine vision lenses on the market cannot meet the requirements of large field of view, large aperture, long focal length, high resolution and close object distance
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0052] The focal length of the lens is 57.58mm, the aperture Fno is 4.0, and the total length TTL of the lens is about 128mm.
[0053] The data such as the radius of curvature, central thickness, refractive index nd, and Abbe constant Vd of each lens are shown in Table 1:
[0054]
[0055]
[0056] Table 1
[0057] According to the data in Table 1 and related formulas, it can be obtained:
[0058] f tune=71.16mm; |f tune / f system|=1.235; nd2=2.001; Vd4=81.61; Vd7=75.50.
[0060] Among them, the magnification is the ratio of the image height to the corresponding object height; the working distance is the distance from the apex of the first lens on the object side to the object.
[0061] figure 2 It is a schematic diagram of the lens provided by the embodiment of the present invention. The lens provided by the...
Embodiment 2
[0065] The focal length of the lens is 57.38mm, the aperture Fno is 4, and the total length TTL of the lens is 128mm.
[0066] The data such as the radius of curvature, central thickness, refractive index nd, and Abbe constant Vd of each lens are shown in Table 2:
[0067]
[0068]
[0069] Table 2
[0070] According to the data in Table 2 and related formulas, it can be obtained:
[0071] f tune=71.16mm; |f tune / f system|=1.235; nd2=2.001; Vd4=81.61; Vd7=75.50.
[0073] Among them, the magnification is the ratio of the image height to the corresponding object height; the working distance is the distance from the apex of the first lens on the object side to the object.
[0074] Figure 6 Schematic diagram of the lens provided by the embodiment of the present invention. The lens provided by the second embodim...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The invention discloses a lens, which comprises: a first lens group and a second lens group arranged in sequence from the object side to the image side; the position of the first lens group is fixed, and the second lens group can be positioned along the optical axis Move; the lens group satisfies the following condition: 1.2<|f system / f system|<1.3; wherein, f system is the focal length of the second lens group, and f system is the system focal length of the lens. Because in the embodiment of the present invention, two lens groups are arranged in sequence from the object side to the image side in the lens in a specific order, and the lens groups in the lens satisfy: 1.2<|f-tone / f-system|<1.3; To a certain extent, the field of view, aperture, focal length, and resolution of the lens are increased, and the requirements for close object distance are met.
Description
technical field [0001] The invention relates to the technical field of optical imaging, in particular to a lens. Background technique [0002] Machine vision is the use of machines instead of human eyes for measurement and judgment. The machine vision system refers to converting the target to be detected into an image signal through the machine vision product, that is, the image capture device, and then the image processing system performs various operations on these signals to extract the target features, thereby realizing the control of the on-site equipment action. The image capturing device includes Complementary Metal-Oxide-Semiconductor (CMOS) and Charge-coupled Device (CCD) and so on. [0003] The current machine vision lenses on the market cannot meet the requirements of large field of view, large aperture, long focal length, high resolution and close object distance, so they cannot meet the needs of high-end products. Contents of the invention [0004] The embod...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More