Object space telecentric optical imaging system with long object distance

An optical imaging system and object-space telecentricity technology, which is applied in optics, optical components, instruments, etc., can solve the problems of not being able to install imaging systems at close range, and achieve the effects of low distortion, easy processing, and high object-space telecentricity

Pending Publication Date: 2021-01-19
ANHUI UNIVERSITY OF TECHNOLOGY +1
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Problems solved by technology

[0003] The object distance of commonly used object-space optical imaging optical systems is relatively small, ranging from tens of millimeters to hundreds of millimeters, but in some special application scenarios, it is impossible to install the imaging system at a close distance, which requires a long working distance object Fang Telecentric Optical System

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  • Object space telecentric optical imaging system with long object distance
  • Object space telecentric optical imaging system with long object distance
  • Object space telecentric optical imaging system with long object distance

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Embodiment Construction

[0033] The specific embodiment of the present invention will be described in further detail by describing the embodiments below with reference to the accompanying drawings, the purpose is to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and contribute to its implementation.

[0034] see figure 1 , an object-side telecentric optical imaging system with a long object distance in this embodiment includes a first lens 1, a second lens 2, a third lens 3, a diaphragm 8, The fourth lens 4 , the fifth lens 5 , the sixth lens 6 and the seventh lens 7 , the aperture 8 is located near the focal plane of the image side of the front group of lenses to ensure the telecentricity of the object side.

[0035] The refractive powers of the first lens 1, the third lens 3, the fourth lens 4, the fifth lens 5 and the seventh lens 7 are positive values, and the refractive powers of the seco...

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Abstract

The invention discloses an object space telecentric optical imaging system with a long object distance, and relates to the field of optical imaging. The system sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, the focal power of the first lens, the third lens, the fourth lens, the fifth lens and the seventh lens is a positive value, and the focal power of the second lens and the sixth lens is a negative value, wherein-0.51 < f1/f <-0.36, 0.45 < f2/f < 0.63,-0.66 < f3/f <-0.49,-0.18 < f4/f <-0.07,-0.10 < f5/f <-0.05, 0.05 < f6/f < 0.06, and-0.04 < f7/f <-0.02, and f is the focal length of the object space telecentric optical imaging system, and f1, f2, f3, f4, f5, f6 and f7 are focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens in sequence. The method has the advantages of long object distance, high object space telecentric degree, low distortion, large depth of field and the like.

Description

technical field [0001] The invention relates to the field of optical imaging, in particular to an object-space telecentric optical imaging system with a long object distance. Background technique [0002] With the advancement of photoelectric technology, the detection system based on machine vision has the advantages of fast detection speed, high measurement accuracy, and online real-time monitoring, and has been widely used. The imaging lens is an essential part of the detection system. Because the object-space telecentric lens can maintain almost constant magnification within a certain depth of field, and has the characteristics of large depth of field and low distortion, it is widely used in visual inspection systems. [0003] The object distance of commonly used object-space optical imaging optical systems is relatively small, ranging from tens of millimeters to hundreds of millimeters, but in some special application scenarios, it is impossible to install the imaging s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/22G02B13/02
CPCG02B13/02G02B13/22
Inventor 王伟马成吴建光
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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