Vision lens of high-definition fixed-focus machine
A machine vision and lens technology, applied in instruments, installations, optics, etc., can solve problems such as high machining costs, complex floating focusing mechanisms, and image quality degradation, achieve high resolution, simplify focusing mechanisms, and reduce complexity. Sex and cost effects
Active Publication Date: 2013-03-06
福建省光学技术研究所
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Problems solved by technology
Ordinary machine vision lenses with an overall focusing structure can only be designed for a specific working distance. When this design is applied to the close-up end and the telephoto end, the image quality will drop significantly
The lens with floating focus structure needs to use complex floating focus mechanism, and the cost of machining is very high
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[0030] refer to figure 1 , figure 2 and image 3 , are the optical system diagrams of the visual lens at 220mm, 700mm and infinite object distance respectively.
[0031] The optical system in the high-definition machine vision lens of the present invention adopts 6 groups of 7 lens structures, and the optical system lens group is composed of a focusing group with positive refractive power and a fixed group with positive refractive power. The focusing group U1, the fixed group U2 is arranged in sequence along the optical axis from the object side to the image plane side, and the focusing group is sequentially composed of positive lens L1, positive lens L2, negative lens L3, diaphragm S, and negative lens L4 from the object side to the image plane direction. , positive lens L5, and positive lens L6, wherein negative lens L4 and positive lens L5 form a doublet lens group; negative lens L4 and positive lens L5 in the doublet lens group are made of flint glass and heavy lanthanu...
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The invention relates to a high-definition fixed-focus machine vision lens, which includes a focusing group and a fixed group in the optical system lens group, and is characterized in that: the optical system lens group consists of a focusing group with positive refractive power and a positive refractive power Composed of fixed groups, the focusing group and the fixed group are arranged in order along the optical axis from the object side to the image plane side, the combined focal length of the focusing group is f1, and the focal length of the fixed group is f2, which should satisfy the following inequalities: 0.1<|f1 / f2|<0.35. The invention adopts a fixed rear group focusing structure, has the characteristics of maintaining high resolution and small distortion in the full working distance range, and simplifies the focusing mechanism, and is suitable for a machine vision system with 5 million pixels.
Description
Technical field: [0001] The invention belongs to the technical field of optical instruments, and relates to a high-resolution and small-distortion high-definition fixed-focus machine vision lens suitable for matching with a machine vision system. 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 ingested target into an image signal through a machine vision product (that is, an image capture device, which is divided into two types: CMOS and CCD), and sending it to a dedicated image processing system. The image system performs various calculations on these signals to extract the characteristics of the target, and then controls the on-site equipment actions according to the results of the discrimination. [0003] In recent years, with the rapid development of the microelectronics industry, machine vision systems with high resolution and high processing spee...
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IPC IPC(8): G02B7/02G02B7/04
Inventor 吴鸿春柯重荣黄丽惠
Owner 福建省光学技术研究所