阅读说明：本技术 一种低成本超大口径的物方远心光学系统 (Low-cost ultra-large-caliber object space telecentric optical system ) 是由 向先兵 陈铭勇 于 2019-08-29 设计创作，主要内容包括：本发明公开了一种低成本超大口径的物方远心光学系统,包括在同一射线上的物面、菲涅尔透镜、孔径光阑、非远心有限远成像系统和像面,物面用于接收入射光线,物面接收的入射光线依次经过菲涅尔透镜、孔径光阑和非远心有限远成像系统成像在像面上,非远心有限远成像系统为CCTV镜头、FA镜头或照相机镜头。本发明当透镜口径大于300,可以用菲涅尔透镜代替超大口径的透镜,在生产制造过程,生产一个超大口径的菲涅尔透镜比生产一个普通的透镜简单,时间短很多；在重量方面,菲涅尔透镜比较轻；精度方面,只是略微比普通差一点。总的来说,在大口径的远心系统中,用菲涅尔透镜,可以使大口径远心系统的成本降低。(The invention discloses a low-cost ultra-large-caliber object space telecentric optical system, which comprises an object plane, a Fresnel lens, an aperture diaphragm, a non-telecentric finite distance imaging system and an image plane on the same ray, wherein the object plane is used for receiving incident rays, the incident rays received by the object plane are imaged on the image plane through the Fresnel lens, the aperture diaphragm and the non-telecentric finite distance imaging system in sequence, and the non-telecentric finite distance imaging system is a CCTV lens, an FA lens or a camera lens. When the aperture of the lens is larger than 300, the Fresnel lens can be used for replacing the lens with the ultra-large aperture, and the production of the Fresnel lens with the ultra-large aperture is simpler than the production of a common lens in the production and manufacturing process, and the time is much shorter; fresnel lenses are relatively light in weight; the accuracy is only slightly worse than normal. In general, in a large-caliber telecentric system, the Fresnel lens is used, so that the cost of the large-caliber telecentric system can be reduced.)

1. The utility model provides a low-cost object space telecentric optical system of super large bore which characterized in that: the imaging system comprises an object plane, a Fresnel lens, an aperture diaphragm, a non-telecentric finite distance imaging system and an image plane on the same ray, wherein the object plane is used for receiving incident light, the incident light received by the object plane is imaged on the image plane through the Fresnel lens, the aperture diaphragm and the non-telecentric finite distance imaging system in sequence, and the non-telecentric finite distance imaging system is a CCTV lens, an FA lens or a camera lens.

2. The low-cost ultra-large aperture object-side telecentric optical system of claim 1, wherein: the Fresnel lens, the aperture diaphragm and the non-telecentric finite distance imaging optical system are sequentially and coaxially arranged.

3. The low-cost ultra-large aperture object-side telecentric optical system of claim 1, wherein: the Fresnel lens comprises an image space focal plane, and the aperture diaphragm is fixedly arranged on the image space focal plane of the Fresnel lens.

4. The low-cost ultra-large aperture object-side telecentric optical system of claim 1, wherein: the aperture diaphragm is a CCTV lens, an FA lens or an aperture diaphragm of a camera lens.

5. The low-cost ultra-large aperture object-side telecentric optical system of claim 1, wherein: the number of the same rays is more than 6.

Technical Field

The invention relates to a low-cost ultra-large-caliber object space telecentric optical system, and belongs to the technical field of optical systems.

Background

So far, with the wide application of machine vision systems in the field of precision detection, common industrial lenses are difficult to meet the detection requirements, and telecentric lenses are produced in order to make up for the application defects of common lenses and adapt to the requirements of precision detection. Telecentric lenses have been favored for machine vision applications where lens distortion is highly demanding due to their unique parallel optical path design.

The object space telecentric system can ensure that the magnification of the obtained image is not changed within a certain object distance range, which is very important to the condition that the measured objects are not on the same object plane.

Meanwhile, the diameter of the first lens is definitely larger than the visual field of an object space due to the limitation of the principle of the object space telecentric optical system, so that the manufacturing of an object space telecentric system with an ultra-large diameter needs the manufacturing of a lens with an ultra-large diameter. However, the manufacturing process of manufacturing an ultra-large-aperture lens is complex, the required technology is high, the consumed time is long, and the lens is heavy, in other words, the manufacturing cost of the ultra-large-aperture lens is high, the period is long, and the weight is heavy. For example, referring to the invention patent with application number 201510443280.8, when the aperture of the first lens is larger than 300, the lens is expensive to manufacture, heavy and complicated to manufacture.

In order to solve the technical problems, a new technical scheme is especially provided.

Disclosure of Invention

The invention aims to provide a low-cost ultra-large-caliber object space telecentric optical system to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a low-cost object space telecentric optics system of super large bore, includes object plane, fresnel lens, aperture diaphragm, the finite far imaging system of non-telecentric and image plane on same ray, the object plane is used for receiving incident light, the incident light that the object plane was received is in proper order through fresnel lens, aperture diaphragm and the imaging system of the finite far imaging system of non-telecentric on the image plane, the finite far imaging system of non-telecentric is CCTV camera lens, FA camera lens or camera lens.

Preferably, the fresnel lens, the aperture diaphragm and the non-telecentric finite distance imaging optical system are coaxially arranged in sequence.

Preferably, the fresnel lens includes an image focal plane, and the aperture stop is fixedly disposed on the image focal plane of the fresnel lens.

Preferably, the aperture stop is an aperture stop of a CCTV lens, an FA lens or a camera lens.

Preferably, the number of the same ray is 6 or more.

Compared with the prior art, the invention has the beneficial effects that: when the aperture of the lens is larger than 300, the Fresnel lens can be used for replacing the lens with the ultra-large aperture, and the production of the Fresnel lens with the ultra-large aperture is simpler than the production of a common lens in the production and manufacturing process, and the time is much shorter; fresnel lenses are relatively light in weight; the accuracy is only slightly worse than normal. In general, in a large-caliber telecentric system, the Fresnel lens is used, so that the cost of the large-caliber telecentric system can be reduced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to the attached drawings of the specification, the invention provides a technical scheme that: the utility model provides a low-cost object space telecentric optics system of super large bore, includes object plane 2, fresnel lens 3, aperture diaphragm 4, non-telecentric finite far imaging system and image plane 6 on same ray 1, object plane 2 is used for receiving incident light, incident light that object plane 2 received is in proper order through fresnel lens 3, aperture diaphragm 4 and non-telecentric finite far imaging optics system 5 formation of image on image plane 6, non-telecentric finite far imaging optics system 1 is CCTV camera lens, FA camera lens or camera lens.

Preferably, the fresnel lens 3, the aperture stop 4 and the non-telecentric finite distance imaging optical system 5 are coaxially arranged in sequence.

Preferably, the fresnel lens includes an image-side focal plane, and the aperture stop 4 is fixedly placed on the image-side focal plane of the fresnel lens 3.

Preferably, the aperture stop 4 is an aperture stop 4 of a CCTV lens, an FA lens, or a camera lens itself.

Preferably, the number of the same rays 1 is 6 or more.

With the wide application of the machine vision system in the field of precision detection, the common industrial lens is difficult to meet the detection requirement, and the telecentric lens is produced as required to make up for the application deficiency of the common lens and adapt to the precision detection requirement. Telecentric lenses have been favored for machine vision applications where lens distortion is highly demanding due to their unique parallel optical path design. In the low-cost, low-precision and ultra-large-caliber object space telecentric optical system disclosed by the invention, the Fresnel lens 3 is used for replacing an ultra-large-caliber lens, so that the cost of the object space telecentric optical system is reduced.

When the Fresnel lens 3 is used, when the caliber of the lens is larger than 300mm, the Fresnel lens 3 can be used for replacing a lens with an ultra-large caliber, and in the production and manufacturing process, the production of the Fresnel lens 3 with the ultra-large caliber is simpler than the production of a common lens, and the time is much shorter; the fresnel lens 3 is comparatively light in weight; the accuracy is only slightly worse than normal. In general, in a large-aperture telecentric system, the Fresnel lens 3 can be used to reduce the cost of the large-aperture telecentric system.

The drawings are only for purposes of illustrating the principles of the invention as will be readily understood by those of ordinary skill in the art. Because of the limitation of the page size of the patent application document, in order to clearly present the principle, the proportional size between each component in the drawings may be inconsistent with the actual product, and it can be understood by those skilled in the art that, for example, the structural principle of highlighting a certain part in the drawings, the part is intentionally drawn to be larger, and the other part is too small, and the like, all of which can be understood in this situation.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Based on the situation that no product has advantages and disadvantages, the invention is only used for specific environments in the background technology, for example, scenes mentioned in the background technology, such as price factors, inconvenience in carrying and the like are considered by some users, the purchase of the application is not recommended, and the product is only used for and recommended to users who need to mention scenes in the background technology and can accept and ignore other negative factors.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.