CN220305556U - Double-rate double-telecentric lens - Google Patents

Abstract

The utility model discloses a double-rate double-telecentric lens, which comprises an imaging light path, a reflecting light path and a transmitting light path, wherein the imaging light path is sequentially arranged into a first lens group G1, a beam splitting prism BS, a diaphragm STO1, a second lens group G2 and an image plane IMA1; the direction of the reflection light path of the beam splitter prism BS is sequentially provided with a diaphragm STO2, a third lens group G3 and an image plane IMA2, the object space view field of the transmission light path is phi 154mm, the magnification is-0.0481 times, the aperture is 5, the object space optical resolution is 60um, and the image plane size is phi 7.4mm; the field of view of the reflection light path is phi 64mm, the magnification is-0.1439 times, the aperture is 4.8, the object space optical resolution is 20um, and the image plane size is phi 9.3mm. According to the utility model, by sharing the front lens group, the combination of large-view-field imaging and high-optical-resolution imaging is realized, and the increase of detection time caused by the increase of detection stations and the reduction of detection precision caused by vibration of a motion platform are avoided, so that one lens can simultaneously meet the requirements of large-view-field and high-precision optical detection.

Description

Double-rate double-telecentric lens

Technical Field

The utility model relates to the technical field of visual inspection, in particular to a double-rate double-telecentric lens.

Background

The double telecentric lens is a lens with both object-side chief rays and image-side chief rays parallel to an optical axis, and compared with a traditional industrial lens, the double telecentric lens can prevent the imaging multiplying power of the lens from changing when the position of a measured object relative to the lens changes, and is widely applied to various optical detection devices at present. In many detection scenes, the detection of a large field of view of a sample needs to be realized, and meanwhile, the detection of high optical resolution is required, generally, two lenses are adopted, one lens is used for realizing the imaging of the large field of view, the other lens is used for realizing the imaging of high optical resolution, and two detection stations are used for completing the process.

Disclosure of Invention

The present application is directed to a double-rate double-telecentric lens, which combines large-field imaging and high-optical resolution imaging by sharing a front lens group, so as to realize one lens and simultaneously satisfy large-field and high-precision optical detection to solve the problems in the background art.

In order to achieve the above purpose, the present application provides the following technical solutions: the double-rate double-telecentric lens is sequentially arranged along the light path into a first lens group G1, a beam splitting prism BS, a diaphragm STO1, a second lens group G2 and an image plane IMA1; the direction of a reflection light path of the beam splitting prism of the double-rate double-telecentric lens is sequentially provided with a diaphragm STO2, a third lens group G3 and an image plane IMA2, the object space view field of a transmission light path of the double-rate double-telecentric lens is phi 154mm, the magnification is-0.0481 times, the aperture is 5, the object space optical resolution is 60um, and the image plane size is phi 7.4mm; the field of view of the reflection light path is phi 64mm, the magnification is-0.1439 times, the aperture is 4.8, the object space optical resolution is 20um, and the image plane size is phi 9.3mm.

The first lens group G1 is sequentially arranged into a biconvex lens L1, a convex-concave lens L2, a convex-concave lens L3, a biconcave lens L4 and a biconcave lens L5 along the imaging light path direction; the second lens group G2 is sequentially arranged along the imaging light path direction as a meniscus lens L6, a meniscus lens L7, a biconvex lens L8, a meniscus lens L9, and a biconvex lens L10; the third lens group G3 is sequentially arranged along the imaging light path direction as a biconvex lens L11, a meniscus lens L12, a biconvex lens L13, a meniscus lens L14, and a meniscus lens L15;

the beam splitting prism BS has a 45-degree half-reflection half-transmission beam splitting surface.

In summary, the utility model has the technical effects and advantages that:

the utility model combines the large-view-field imaging and the high-optical-resolution imaging by sharing the front lens group, and avoids the increase of detection time caused by the increase of a detection station and the reduction of detection precision caused by the vibration of a moving platform, thereby realizing that one lens simultaneously meets the requirements of large-view-field and high-precision optical detection.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of a first lens group G1 according to the present utility model;

FIG. 3 is a schematic diagram of a second lens group G2 according to the present utility model;

FIG. 4 is a schematic diagram of a third lens group G3 according to the present utility model;

FIG. 5 is a schematic view of an imaging optical path of the present utility model;

FIG. 6 is a graph of MTF for a transmission imaging optical path of the present utility model;

FIG. 7 is a graph of distortion of a transmission imaging optical path of the present utility model;

FIG. 8 is a graph of MTF for a reflective imaging optical path of the present utility model;

fig. 9 is a graph of distortion of a reflection imaging optical path of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Examples: referring to fig. 1 to 9, a double-rate double-telecentric lens is sequentially arranged along an optical path into a first lens group G1, a beam splitter prism BS, a diaphragm STO1, a second lens group G2, and an image plane IMA1; the direction of a reflection light path of the beam splitting prism of the double-rate double-telecentric lens is sequentially provided with a diaphragm STO2, a third lens group G3 and an image plane IMA2, the object space view field of a transmission light path of the double-rate double-telecentric lens is phi 154mm, the magnification is-0.0481 times, the aperture is 5, the object space optical resolution is 60um, and the image plane size is phi 7.4mm; the field of view of the reflection light path is phi 64mm, the magnification is-0.1439 times, the aperture is 4.8, the object space optical resolution is 20um, and the image plane size is phi 9.3mm.

Preferably, the first lens group G1 is sequentially arranged along the imaging light path direction as a biconvex lens L1, a convex-concave lens L2, a convex-concave lens L3, a biconcave lens L4, and a biconcave lens L5; the second lens group G2 is sequentially arranged along the imaging light path direction as a meniscus lens L6, a meniscus lens L7, a biconvex lens L8, a meniscus lens L9, and a biconvex lens L10; the third lens group G3 is sequentially arranged along the imaging light path direction as a biconvex lens L11, a meniscus lens L12, a biconvex lens L13, a meniscus lens L14, and a meniscus lens L15;

preferably, the beam splitting prism BS has a 45-degree half-reflection half-transmission beam splitting surface;

preferably, in the transmission imaging light path, the distance from the object plane to the first lens group G1 is 103mm, the distance from the lens group G1 to the beam splitter prism BS is 17.74mm, the distance from the beam splitter prism BS to the diaphragm STO1 is 10.08mm, the distance from the diaphragm STO1 to the second lens group G2 is 4mm, and the distance from the second lens group G2 to the image plane IMA1 is 23.4mm;

preferably, in the reflection imaging light path of the beam splitter prism BS, the distance from the light emitting surface of the beam splitter prism BS to the diaphragm STO2 is 10.08mm, the distance from the diaphragm STO2 to the third lens group G3 is 4mm, and the distance from the third lens group G3 to the image plane IMA2 is 27.93mm;

preferably, the refractive indexes of the lenses of the first lens group G1 along the imaging optical path direction are as follows: biconvex lenses L1,1.52, convex-concave lenses L2,1.52, convex-concave lenses L3,1.53, biconcave lenses L4,1.85, biconcave lenses L5,1.5; the refractive indexes of the lenses of the second lens group G2 along the imaging light path direction are as follows: meniscus lens L6,1.71, meniscus lens L7,1.81, biconvex lens L8,1.5, meniscus lens L9,1.85, biconvex lens L10,1.5; the refractive indexes of the lenses of the third lens group G3 along the imaging light path direction are as follows: lenticular lenses L11,1.43, meniscus lenses L12,1.81, lenticular lenses L13,1.46, meniscus lenses L14,1.85, meniscus lenses L15,1.73;

preferably, the abbe number of the lenses of the first lens group G1 along the imaging light path direction is: biconvex lenses L1, 64.2, convex-concave lenses L2,64.2, convex-concave lenses L3, 63.5, biconcave lenses L4, 23.8, biconcave lenses L5, 81.6; the refractive indexes of the lenses of the second lens group G2 along the imaging light path direction are as follows: meniscus lenses L6, 53.8, meniscus lenses L7, 34.2, biconvex lenses L8, 81.6, meniscus lenses L9, 23.8, biconvex lenses L10, 81.6; the refractive indexes of the lenses of the third lens group G3 along the imaging light path direction are as follows: biconvex lenses L11, 95.2, meniscus lenses L12, 25.3, biconvex lenses L13, 90.9, meniscus lenses L14, 23.6, meniscus lenses L15, 54.5;

preferably, the curvature radius of the lenses of the first lens group G1 along the imaging light path direction is as follows: biconvex lenses L1, 336.642mm and 2910.531mm, convex-concave lenses L2,100.768mm and 222.197mm, convex-concave lenses L3, 106.852mm and 178.613mm, biconcave lenses L4, 400.226mm and 174.837mm, biconcave lenses L5, 400.019mm and 15.636mm; the refractive indexes of the lenses of the second lens group G2 along the imaging light path direction are as follows: meniscus L6, 14.310mm and 17.539mm, meniscus L7, 249.866mm and 33.091mm, biconvex L8, 37.020mm and 155.449mm, meniscus L9, 20.067mm and 29.559mm, biconvex L10, 145.276mm and 32.264mm; the refractive indexes of the lenses of the third lens group G3 along the imaging light path direction are as follows: lenticular lenses L11, 64.703mm and 40.883mm, meniscus lenses L12, 101.506mm and 63.893mm, lenticular lenses L13, 72.108mm and 87.656mm, meniscus lenses L14, 32.132mm and 67.718mm, meniscus lenses L15, 499.492mm and 58.404mm;

preferably, the intervals between the lenses of the first lens group G1 along the imaging light path direction are sequentially as follows: the biconvex lens L1 and the convex-concave lens L2,2.31mm, the convex-concave lens L2 and the convex-concave lens L3,4.83mm, the convex-concave lens L3 and the biconcave lens L4, 56.04mm, the biconcave lens L4 and the biconcave lens L5, 30.07mm; the second lens group G2 sequentially has the following intervals along the imaging optical path direction: meniscus L6 and meniscus L7,3mm, meniscus L7 and biconvex L8,2.79mm, biconvex L8 and meniscus L9,3mm, meniscus L9 and biconvex L10,3.72mm; the intervals of the lenses of the third lens group G3 along the imaging light path direction are as follows: the lenticular lens L11 and the meniscus lenses L12, 15.89mm, the meniscus lens L12 and the lenticular lens L13,4.56mm, the lenticular lens L13 and the meniscus lens L14,5.95mm, the meniscus lens L14 and the meniscus lens L15, 39.06mm.

Finally, it should be noted that: the foregoing description of the preferred embodiments of the present utility model is not intended to be limiting, but rather, it will be apparent to those skilled in the art that the foregoing description of the preferred embodiments of the present utility model can be modified or equivalents can be substituted for some of the features thereof, and any modification, equivalent substitution, improvement or the like that is within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims (3)

1. The double-rate double-telecentric lens is characterized in that: the optical imaging system comprises an imaging optical path, a reflecting optical path and a transmitting optical path, wherein the imaging optical path is sequentially provided with a first lens group G1, a beam splitting prism BS, a diaphragm STO1, a second lens group G2 and an image plane IMA1; the direction of the reflection light path of the beam splitter prism BS is sequentially provided with a diaphragm STO2, a third lens group G3 and an image plane IMA2, the object view field of the transmission light path of the double-rate double-telecentric lens is phi 154mm, the magnification is-0.0481 times, the aperture is 5, the object optical resolution is 60um, and the image plane size is phi 7.4mm; the field of view of the reflection light path is phi 64mm, the magnification is-0.1439 times, the aperture is 4.8, the object space optical resolution is 20um, and the image plane size is phi 9.3mm.

2. The double-magnification double telecentric lens according to claim 1, wherein the first lens group G1 is sequentially arranged along the imaging optical path direction as a biconvex lens L1, a convex-concave lens L2, a convex-concave lens L3, a biconcave lens L4, and a biconcave lens L5; the second lens group G2 is sequentially arranged along the imaging light path direction as a meniscus lens L6, a meniscus lens L7, a biconvex lens L8, a meniscus lens L9, and a biconvex lens L10; the third lens group G3 is sequentially arranged along the imaging light path direction as a biconvex lens L11, a meniscus lens L12, a biconvex lens L13, a meniscus lens L14, and a meniscus lens L15;

3. the double-rate double telecentric lens according to claim 1, wherein the beam splitting prism BS has a 45-degree half-reflection half-transmission beam splitting surface.