阅读说明：本技术 一种1.0倍110mm物距高分辨率工业双远心镜头 (1.0-time 110mm object distance high-resolution industrial double telecentric lens ) 是由 魏雄斌 李俊攀 叶其安 于 2019-11-22 设计创作，主要内容包括：本发明涉及一种1.0倍110mm物距高分辨率工业双远心镜头,包括主镜筒,所述主镜筒内沿光线入射方向自前向后分别设有前组镜片、固定光阑、后组镜片；所述前组镜片依次为第一双凸透镜、第一正月牙形透镜、第一双凹透镜和第二正月牙形透镜密接的第一胶合组；所述后组镜片依次为第二双凹透镜、第二双凸透镜、第三正月牙形透镜和第四正月牙形透镜密接的第二胶合组。该镜头具有良好的一体性,可适用多种检测行业,并具有超低畸变、高景深、低视差等优点。(The invention relates to a 1.0-time 110mm object distance high-resolution industrial double telecentric lens, which comprises a main lens barrel, wherein a front group of lenses, a fixed diaphragm and a rear group of lenses are respectively arranged in the main lens barrel from front to back along the light incidence direction; the front group lens is a first gluing group formed by tightly connecting a first biconvex lens, a first regular crescent lens, a first biconcave lens and a second regular crescent lens in sequence; the rear group lens is a second adhesive combination formed by tightly connecting a second biconcave lens, a second biconvex lens, a third regular crescent lens and a fourth regular crescent lens in sequence. The lens has good integrity, is suitable for various detection industries, and has the advantages of ultralow distortion, high depth of field, low parallax and the like.)

1. A1.0 times 110mm object distance high resolution industry pair telecentric lens, including the main lens-barrel, wherein, there are front group lens, fixed diaphragm, rear group lens in the said main lens-barrel from the front to the back respectively along the incident direction of light; the front group lens is a first gluing group formed by tightly connecting a first biconvex lens, a first regular crescent lens, a first biconcave lens and a second regular crescent lens in sequence; the rear group lens is a second adhesive combination formed by tightly connecting a second biconcave lens, a second biconvex lens, a third regular crescent lens and a fourth regular crescent lens in sequence.

2. The 1.0-fold 110mm object distance high resolution industrial double telecentric lens according to the claim 1, wherein the air space between the first biconvex lens and the first regular crescent lens is 0.99 mm; the air space between the first positive crescent lens and the first gluing set is 1.13 mm.

3. The industrial double telecentric lens with 1.0 times 110mm object distance and high resolution according to claim 1, wherein the air space between the front group of lenses and the rear group of lenses is 27.73 mm; the air space between the front group of lenses and the fixed diaphragm is 24.51 mm; and the air interval between the fixed diaphragm and the rear group of lenses is 3.22 mm.

4. The 1.0x 110mm object distance high resolution industrial double telecentric lens according to the claim 1, 2 or 3, wherein the air space between the second double concave lens and the second double convex lens is 11.16 mm; the air space between the second biconvex lens and the second glue set is 29.57 mm.

5. The industrial double-telecentric lens with 1.0 time of 110mm object distance and high resolution according to claim 1, wherein the main lens barrel comprises a front lens barrel for mounting a first biconvex lens, a first regular crescent lens, a first cemented group, a second biconcave lens and a second biconvex lens, the rear end of the front lens barrel is connected with a rear lens barrel for mounting a second cemented group, and the rear end of the rear lens barrel is connected with a CCD flange.

6. The industrial double-telecentric lens with 1.0-fold 110mm object distance and high resolution according to claim 5, wherein the front lens barrel is provided with a front chamber and a rear chamber which are communicated, the front end of the front chamber is in threaded connection with a front pressing ring for locking the first biconvex lens, a front spacer ring is arranged between the first biconvex lens and the first regular crescent lens, a bearing surface for abutting against the periphery of the rear side of the second regular crescent lens is arranged in the front chamber, an extinction step is arranged at the rear side of the bearing surface in the front chamber, an extinction thread is arranged at the rear side of the extinction step in the front chamber, and the fixed diaphragm is arranged at the rear end of the front chamber; the rear cavity is internally provided with a middle spacer ring positioned between the second biconcave lens and the second biconvex lens, and the rear end of the rear cavity is in threaded connection with a middle pressing ring used for locking the second biconvex lens.

7. The industrial double-telecentric lens with 1.0-fold 110mm object distance and high resolution according to claim 5 or 6, wherein the front part of the mounting cavity of the rear lens barrel is provided with a delustering thread, the middle part of the mounting cavity of the rear lens barrel is provided with a bearing surface for abutting against the periphery of the front side surface of the third regular crescent shaped lens, and the rear end of the mounting cavity of the rear lens barrel is screwed with a rear pressing ring for pressing against the periphery of the rear side surface of the fourth regular crescent shaped lens.

8. The industrial double-telecentric lens with 1.0-fold 110mm object distance and high resolution according to claim 5, wherein the front lens barrel is in threaded connection with the rear lens barrel, the front part of the CCD flange is sleeved at the rear end of the rear lens barrel and is fixedly connected with the rear lens barrel through a set screw radially arranged on the circumferential surface, and the rear end of the CCD flange is provided with C-interface threads.

9. The industrial double telecentric lens with the object distance of 1.0 times 110mm and the high resolution according to claim 6, wherein the inner rings of the front spacer ring and the middle spacer ring are in a step-shaped bearing structure.

Technical Field

The invention relates to a 1.0-time 110mm object distance high-resolution industrial double telecentric lens.

Background

With the expansion of the industrial detection industry, although there are many types of telecentric lenses on the market, the test effect still cannot meet all market demands, because of the problems of large imaging edge distortion, insufficient depth of field, parallax, large structural volume and the like. Therefore, it is meaningful to have a small volume, ultra-low distortion, high depth of field, and low parallax to complement the market demand.

Disclosure of Invention

The invention aims to provide a 1.0-time 110mm object distance high-resolution industrial double telecentric lens which has good integrity, is suitable for various detection industries and has the advantages of ultralow distortion, high depth of field, low parallax and the like.

The technical scheme of the invention is as follows: a1.0-time 110mm object distance high-resolution industrial double telecentric lens comprises a main lens barrel, wherein a front group of lenses, a fixed diaphragm and a rear group of lenses are respectively arranged in the main lens barrel from front to back along the light incidence direction; the front group lens is a first gluing group formed by tightly connecting a first biconvex lens, a first regular crescent lens, a first biconcave lens and a second regular crescent lens in sequence; the rear group lens is a second adhesive combination formed by tightly connecting a second biconcave lens, a second biconvex lens, a third regular crescent lens and a fourth regular crescent lens in sequence.

Further, the air space between the first biconvex lens and the first regular crescent lens is 0.99 mm; the air space between the first positive crescent lens and the first gluing set is 1.13 mm.

Further, the air space between the front group of lenses and the rear group of lenses is 27.73 mm; the air space between the front group of lenses and the fixed diaphragm is 24.51 mm; and the air interval between the fixed diaphragm and the rear group of lenses is 3.22 mm.

Further, the air space between the second biconcave lens and the second biconvex lens is 11.16 mm; the air space between the second biconvex lens and the second glue set is 29.57 mm.

Furthermore, the main lens cone comprises a front lens cone used for mounting a first biconvex lens, a first regular crescent lens, a first cemented group, a second biconcave lens and a second biconvex lens, the rear end of the front lens cone is connected with a rear lens cone used for mounting the second cemented group, and the rear end of the rear lens cone is connected with a CCD flange.

Furthermore, the front lens barrel is provided with a front cavity and a rear cavity which are communicated, the front end of the front cavity is in threaded connection with a front pressing ring used for locking the first biconvex lens, a front spacing ring is arranged between the first biconvex lens and the first regular crescent lens, a bearing surface used for abutting against the periphery of the rear side of the second regular crescent lens is arranged in the front cavity, an extinction step is arranged on the rear side of the bearing surface in the front cavity, an extinction thread is arranged on the rear side of the extinction step in the front cavity, and the fixed diaphragm is installed at the rear end of the front cavity; the rear cavity is internally provided with a middle spacer ring positioned between the second biconcave lens and the second biconvex lens, and the rear end of the rear cavity is in threaded connection with a middle pressing ring used for locking the second biconvex lens.

Furthermore, the front part of the mounting cavity of the rear lens barrel is provided with an extinction thread, the middle part of the mounting cavity of the rear lens barrel is provided with a bearing surface used for abutting against the periphery of the front side surface of the third regular crescent moon-shaped lens, and the rear end of the mounting cavity of the rear lens barrel is in threaded connection with a rear pressing ring used for pressing the periphery of the rear side surface of the fourth regular crescent moon-shaped lens.

Furthermore, the front lens cone is in threaded connection with the rear lens cone, the front part of the CCD flange is sleeved at the rear end of the rear lens cone and is fixedly connected with the rear lens cone through a set screw arranged on the circumferential surface in the radial direction, and the rear end of the CCD flange is provided with a C-interface thread.

Furthermore, the inner rings of the front spacing ring and the middle spacing ring are of stepped bearing structures.

Compared with the prior art, the invention has the following advantages: the lens has the advantages of small volume, ultralow distortion, high depth of field, low parallax and the like, can meet the industrial detection industries of particle measurement, color measurement, photoetching mask layer measurement, filter control, blood analysis, cell metering and the like, and provides a structural appearance with small structure and lighter volume for a visual detection system.

Eight lenses are designed in the optical system of the lens, and parallel light is controlled by reasonably matching eight spherical lens materials of the front group and the rear group; the corresponding pupils are in an infinite state by reasonably controlling the chief rays of the object space and the image space, so that the function of eliminating parallax is achieved. Furthermore, the MTF of the lens is more than or equal to 0.4 (shown in figure 3) when the object distance is 110mm and the lens is at 80lp/mm, so that the resolution is more than or equal to 500 ten thousand pixels and the optical distortion is less than or equal to 0.001% (shown in figure 4).

The mechanical structure of the lens adopts a three-section butt joint forming structure, wherein the front lens cone and the rear lens cone are in threaded connection through threads; the rear lens cone is in butt joint with the CCD flange through a set screw, so that the coaxiality of all the lenses is effectively realized. In order to ensure the consistency of the aperture value of the lens, the diaphragm structure is designed into a fixed diaphragm, so that the stability of the lens is improved, and the optical performance of the lens is further ensured. In order to improve the resolution capability of the lens, the front lens barrel and the rear lens barrel are provided with the extinction steps, the extinction threads and the extinction threads, so that the influence of stray light and ghost on the optical performance is effectively reduced, and the imaging quality of the lens is ensured. In order to further reduce stray light and ghost images, the front spacing ring and the middle spacing ring are designed into a step-shaped bearing structure, so that incidence and reflection of the stray light are reduced, and the right-angle design of the spacing ring is matched with the lens to bear the lens, so that the assembling stability of the lens is further enhanced. Meanwhile, in order to ensure the stability of each lens of the front group and the rear group, three pressing rings are designed for final fixing and locking of lens assembly besides two spacing rings, so that the stability and consistency of the optical performance of the lens are ensured.

Drawings

FIG. 1 is a diagram of the structure of an optical system of the present invention;

FIG. 2 is a schematic view of a lens structure according to the present invention;

FIG. 3 is a graph of MTF according to the present invention;

FIG. 4 is a graph of distortion variation of the present invention;

in the figure: 1. the lens comprises a front pressing ring 2, a first biconvex lens 3, a front spacer 4, a first regular crescent lens 5, a first biconcave lens 6, a first regular crescent lens 7, an extinction step 8, a front lens barrel 9, an extinction thread 10, a fixed diaphragm 11, a second biconcave lens 12, a spacer 13, a second biconvex lens 14, an intermediate pressing ring 15, an extinction thread 16, a rear lens barrel 17, a third regular crescent lens 18, a fourth regular crescent lens 19, a rear pressing ring 20, a set screw 21, a CCD flange 22, a C interface thread 23 and an imaging surface.

Detailed Description

In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.

Refer to fig. 1 to 4

A1.0-time 110mm object distance high-resolution industrial double telecentric lens comprises a main lens barrel, wherein a front group of lenses, a fixed diaphragm 10 and a rear group of lenses are respectively arranged in the main lens barrel from front to back along the light incidence direction; the front group lens is a first gluing group formed by tightly connecting a first biconvex lens 2, a first regular crescent lens 4, a first biconcave lens 5 and a second regular crescent lens 6 in sequence; the rear group lens is a second adhesive combination formed by tightly connecting a second biconcave lens 11, a second biconvex lens 13, a third regular crescent lens 17 and a fourth regular crescent lens 18 in sequence.

In this embodiment, the air space between the first biconvex lens and the first regular crescent lens is 0.99 mm; the air space between the first positive crescent lens and the first gluing set is 1.13 mm.

In this embodiment, the air space between the front group of lenses and the rear group of lenses is 27.73 mm; the air space between the front group of lenses and the fixed diaphragm is 24.51 mm; and the air interval between the fixed diaphragm and the rear group of lenses is 3.22 mm.

In this embodiment, the air space between the second biconcave lens and the second biconvex lens is 11.16 mm; the air space between the second biconvex lens and the second glue set is 29.57 mm.

In this embodiment, the main lens barrel includes a front lens barrel 8 for mounting a first biconvex lens, a first regular crescent lens, a first cemented combination, a second biconcave lens and a second biconvex lens, a rear lens barrel 16 for mounting the second cemented combination is connected to a rear end of the front lens barrel, and a CCD flange 21 is connected to a rear end of the rear lens barrel.

In the embodiment, the front lens barrel is provided with a front cavity and a rear cavity which are communicated, the front end of the front cavity is in threaded connection with a front pressing ring 1 used for locking a first biconvex lens, a front space ring 3 is arranged between the first biconvex lens and a first regular crescent lens, a bearing surface used for abutting against the periphery of the rear side of a second regular crescent lens is arranged in the front cavity, an extinction step 7 is arranged on the rear side of the bearing surface in the front cavity, an extinction thread 9 is arranged on the rear side of the extinction step in the front cavity, and the fixed diaphragm is fixedly installed at the rear end of the front cavity; a middle spacer ring 12 positioned between the second biconcave lens and the second biconvex lens is arranged in the rear cavity, and a middle pressure ring 14 used for locking the second biconvex lens is screwed at the rear end of the rear cavity.

In the embodiment, the front lens barrel is integrally machined and formed, so that the assembly concentricity of six lenses in the front lens barrel is ensured. In order to improve the resolution capability of the lens, an extinction step 7 and an extinction thread 9 are designed in the front lens barrel, so that the influence of stray light and ghost on the optical performance is effectively reduced, and the imaging quality of the lens is ensured.

In the embodiment, in order to further reduce stray light and ghost images, the inner rings of the front space ring and the space ring are designed into a stepped bearing structure, so that incidence and reflection of the stray light are reduced, and the right-angle design of the space ring is matched with the lens to bear the lens, so that the stability of lens assembly is further enhanced. And the front pressing ring and the middle pressing ring are matched with the front lens cone and used for finally fixing and locking six lenses in the front lens cone, so that the stability and consistency of the optical performance of the lens are ensured.

In this embodiment, the front part of the mounting cavity of the rear lens barrel is provided with an extinction thread 15, the middle part of the mounting cavity of the rear lens barrel is provided with a bearing surface for abutting against the periphery of the front side surface of the third regular crescent moon-shaped lens, and the rear end of the mounting cavity of the rear lens barrel is screwed with a rear pressing ring 19 for pressing the periphery of the rear side surface of the fourth regular crescent moon-shaped lens.

In the embodiment, the rear lens barrel is integrally machined and formed, so that the assembly concentricity of the rear lens barrel and the two lenses is ensured. In order to guarantee the stability of the second gluing set of the rear set, a rear pressing ring is designed to be matched with the rear lens cone for the final fixation of the second gluing set, and the stability of lens assembly is improved. The rear lens cone is also provided with an internal thread which is threaded with the external thread of the front lens cone through threads, so that the concentricity of the axes of the front and rear lenses is ensured.

In the embodiment, the coaxiality of the axes of the front and rear lenses is realized, and the front lens barrel is connected with the rear lens barrel through threads. In order to realize the connection between the lens barrel and the camera, a CCD flange is designed. The front part of the CCD flange is sleeved at the rear end of the rear lens cone and is fixedly connected with the rear lens cone through three set screws 20 which are radially arranged on the circumferential surface, so that the lens imaging system is superior to 500 ten thousand high-resolution pixels. The rear end of the CCD flange is provided with C interface threads 22, so that the use of most industrial cameras on the market is met, and the practicability is improved.

In this embodiment, the parameters of each lens are shown in the following table:

。

the technical indexes realized by the invention are as follows:

① size of image plane 2/3 ";

② magnification ratio is 1.0X;

③ the distance between the work objects is 110 mm;

④ effective aperture F10.1;

⑤ optical distortion is less than or equal to 0.001%;

⑥ resolution ≥ 500 ten thousand pixels

⑦ depth of field is 2.2 mm;

⑧, the working temperature is-20 ℃ to 60 ℃;

⑨ the specification of the lens is phi 30mm x 121 mm.

It will be apparent to those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and it is not necessary to invent or create any industrial double telecentric lens system with 1.0x 110mm object distance and high resolution in different forms based on the teachings of the present invention, and all equivalent changes, modifications, substitutions and alterations made without departing from the spirit and scope of the present invention are all within the scope of the present invention.