CN108107557B - High-magnification double-side telecentric lens with long working distance - Google Patents
High-magnification double-side telecentric lens with long working distance Download PDFInfo
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- CN108107557B CN108107557B CN201810022560.5A CN201810022560A CN108107557B CN 108107557 B CN108107557 B CN 108107557B CN 201810022560 A CN201810022560 A CN 201810022560A CN 108107557 B CN108107557 B CN 108107557B
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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Abstract
The invention discloses a high-magnification double-sided telecentric lens with a long working distance, which comprises a diaphragm, a front lens group with positive focal power and a rear lens group with negative focal power, wherein the front lens group, the diaphragm and the rear lens group are sequentially arranged along the incidence direction of light rays, and the rear focus of the front lens group is overlapped with the front focus of the rear lens group. The invention can realize long working distance, high telecentricity and low distortion, and can be widely applied to the field of optical lenses.
Description
Technical Field
The invention relates to the field of optical devices, in particular to a high-magnification double-sided telecentric lens with a long working distance.
Background
With the advent of the 4.0 era of industry, the machine vision industry has also developed at a high speed. The optical lens is used as a core component of machine vision, and the imaging quality of the lens is important. Telecentric lenses have superior characteristics from normal lenses: low distortion, constant magnification, etc., so that the lens is widely applied in the field of machine vision non-contact measurement, and a specially designed telecentric lens is often adopted to avoid perspective distortion of a traditional lens. However, the existing telecentric lens is mainly low-magnification, the working distance of part of high-magnification lens is shorter, the size of the lens is bigger, and the numerical aperture is smaller. The existing double telecentric lens cannot have better telecentricity and lower distortion on the premise of ensuring long working distance and high multiplying power.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a high-magnification double-sided telecentric lens with a long working distance.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides a long working distance's two telecentric lens of high multiplying power, includes diaphragm, has the front lens group of positive focal power and has the back lens group of negative focal power, front lens group, diaphragm and back lens group set gradually along the light incident direction, just the back focus of front lens group with the front focus coincidence of back lens group.
Further, the front lens group includes, in order from an object side to an image side: a first lens having positive optical power, a second lens having positive optical power, and a third lens having negative optical power, the second lens and the third lens group forming a cemented lens.
Further, the curvature radius of the curved surface of the first lens close to the object side is 46.69-51.16 mm, and the curvature radius of the curved surface of the first lens close to the image side is: 56.56 to 51.18mm;
the curvature radius of the curved surface of the second lens close to the object space is as follows: 30.87-34.11 mm, wherein the curvature radius of the curved surface of the second lens close to the image space is-42.17 to-38.15 mm;
the curvature radius of the curved surface of the third lens close to the object space is as follows: -42.17 to-38.15 mm, wherein the curvature radius of the curved surface of the third lens close to the image space is 38.94 to 43.04mm.
Further, the thickness of the first lens is 4.09-4.52 mm, the thickness of the second lens is 4.51-4.99 mm, and the thickness of the third lens is 2.14-2.36 mm;
the gap between the first lens and the second lens is 0.19-0.21 mm, and the distance between the third lens and the diaphragm is 49.00-54.16 mm.
Further, at least one of the first, second and third lenses has a dispersion coefficient greater than 80.
Further, the rear lens group includes, in order from an object side to an image side: a fourth lens having positive optical power, a fifth lens having negative optical power, and a sixth lens having positive optical power, the fourth lens and the fifth lens constituting a cemented lens.
Further, a curvature radius of a curved surface of the fourth lens close to the object space is: 20.31-22.45 mm, wherein the curvature radius of the curved surface of the fourth lens close to the image space is 37.06-40.96 mm;
the curvature radius of the curved surface of the fifth lens close to the object space is as follows: 37.06-40.96 mm, wherein the curvature radius of the curved surface of the fifth lens close to the image space is 8.42-9.30 mm;
the curvature radius of the curved surface of the sixth lens close to the object space is as follows: -48.67 to-44.03 mm, and the curvature radius of the curved surface of the sixth lens close to the image space is-14.55 to-13.17 mm.
Further, the thickness of the fourth lens is 1.09-1.21 mm, the thickness of the fifth lens is 1.24-1.37 mm, and the thickness of the sixth lens is 2.14-2.36 mm;
the gap between the fifth lens and the sixth lens is 19.19-21.21 mm, and the distance between the sixth lens and the imaging surface is 16.45-18.19 mm.
Further, the refractive index of at least one of the fourth, fifth and sixth lenses is greater than 1.8.
The beneficial effects of the invention are as follows: the high-magnification double-sided telecentric lens with long working distance sequentially comprises a front lens group with positive focal power, a diaphragm and a rear lens group with negative focal power, and the rear focus of the front lens group is overlapped with the front focus of the rear lens group, so that the long working distance, the high telecentricity and the low distortion can be realized.
Drawings
FIG. 1 is a schematic view of the structure of a long working distance high magnification double sided telecentric lens of the invention;
FIG. 2 is a schematic diagram of a field curvature in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of distortion in an embodiment of the present invention;
FIG. 4 is a graph showing aberration of light corresponding to different image heights according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the present invention provides a high magnification double-sided telecentric lens with a long working distance, comprising a diaphragm 100, a front lens group L1 with positive focal power, and a rear lens group L2 with negative focal power, wherein the front lens group L1, the diaphragm 100, and the rear lens group L2 are sequentially arranged along the incident direction of light, and the rear focal point of the front lens group L1 and the front focal point of the rear lens group L2 coincide.
In this scheme, the back focus of the front lens group L1 and the front focus of the rear lens group L2 coincide to form a keplerian telescope structure form, so that the object-side chief ray and the image-side chief ray are parallel to the optical axis to form a double telecentric optical path. In addition, the front lens group L1 having positive power and the rear lens group L2 having negative power are disposed along both sides of the stop 100, and distortion can be eliminated.
Further as a preferred embodiment, the front lens group L1 includes, in order from an object side to an image side: the lens comprises a first lens G1 with positive focal power, a second lens G2 with positive focal power and a third lens G3 with negative focal power, wherein the second lens G2 and the third lens G3 form a cemented lens.
Further as a preferable embodiment, the curvature radius of the curved surface of the first lens G1 near the object side is 46.69 to 51.16mm; the curvature radius of the curved surface of the first lens G1 near the image space is: 56.56 to 51.18mm;
the curvature radius of the curved surface of the second lens G2 near the object space is: 30.87-34.11 mm, wherein the curvature radius of the curved surface of the second lens G2 close to the image space is-42.17 to-38.15 mm;
the curvature radius of the curved surface of the third lens G3 near the object space is: -42.17 to-38.15 mm; the curvature radius of the curved surface of the third lens G3 close to the image space is 38.94-43.04 mm.
Further as a preferred embodiment, the thickness of the first lens G1 is 4.09 to 4.52mm, the thickness of the second lens G2 is 4.51 to 4.99mm, and the thickness of the third lens G3 is 2.14 to 2.36mm;
the gap between the first lens G1 and the second lens G2 is 0.19-0.21 mm, and the distance between the third lens G3 and the diaphragm 100 is 49.00-54.16 mm.
Further as a preferred embodiment, the first lens G1, the second lens G2, and the third lens G3 have an abbe number of at least one lens greater than 80.
Preferably, in the present embodiment, the radius of curvature of the curved surface of the first lens G1 near the object side is preferably 49.15mm, the radius of curvature of the curved surface of the first lens G1 near the image side is preferably-53.87 mm, the thickness of the first lens G1 is 4.30mm, and correspondingly, the effective focal length of the first lens G1 is 39.21mm.
The radius of curvature of the curved surface of the second lens G2 near the object side is preferably 32.49mm, the radius of curvature of the curved surface of the second lens G2 near the image side is preferably-40.16 mm, the thickness of the second lens G2 is 4.75mm, and the effective focal length of the second lens G2 is 41.493mm.
The radius of curvature of the curved surface of the third lens G3 near the object side is preferably 21.38mm, the radius of curvature of the curved surface of the third lens G3 near the image side is preferably 39.01mm, the thickness of the third lens G3 is 2.25mm, and the effective focal length of the third lens G3 is-24.861 mm.
Accordingly, the effective focal length of the cemented lens composed by the second lens G2 and the third lens G3 is-71.408 mm.
In this embodiment, the gap between the first lens G1 and the second lens G2 is preferably 0.2mm, and the distance between the third lens G3 and the diaphragm 100 is preferably 51.58mm.
Further as a preferred embodiment, the rear lens group L2 includes, in order from an object side to an image side: a fourth lens G4 having positive optical power, a fifth lens having negative optical power, and a sixth lens G6 having positive optical power, the fourth lens G4 and the fifth lens G5 constituting a cemented lens.
Further, in a preferred embodiment, a curvature radius of the curved surface of the fourth lens G4 near the object side is: 20.31-22.45 mm, preferably 21.38mm in this embodiment; the curvature radius of the curved surface of the fourth lens G4 near the image space is 37.06-40.96 mm, and in this embodiment, 39.01mm is preferable;
the curvature radius of the curved surface of the fifth lens G5 near the object space is: 37.06-40.96 mm, the preferred embodiment is 39.01mm; the curvature radius of the curved surface of the fifth lens G5 near the image space is 8.42-9.30 mm, and the preferred embodiment is 8.86mm;
the curvature radius of the curved surface of the sixth lens G6 near the object side is: -48.67 to-44.03 mm, preferably-46.35 mm in this embodiment; the curvature radius of the curved surface of the sixth lens G6 near the image space is-14.55 to-13.17 mm, and in this embodiment, is preferably-13.86 mm.
Further as a preferred embodiment, the thickness of the fourth lens G4 is 1.09 to 1.21mm, the thickness of the fifth lens G5 is 1.24 to 1.37mm, and the thickness of the sixth lens G6 is 2.14 to 2.36mm;
the gap between the fifth lens G5 and the sixth lens G6 is 19.19 to 21.21mm, and the distance between the sixth lens G6 and the imaging surface 200 is 16.45 to 18.19mm.
Further as a preferred embodiment, the refractive index of at least one of the fourth lens G4, the fifth lens G5 and the sixth lens G6 is greater than 1.8.
Preferably, in the present embodiment, the radius of curvature of the curved surface of the fourth lens G4 near the object side is preferably 21.38mm, the radius of curvature of the curved surface of the fourth lens G4 near the image side is preferably 39.01mm, the thickness of the fourth lens G4 is 1.15mm, and the effective focal length of the fourth lens G4 is 54.308mm.
The radius of curvature of the curved surface of the fifth lens G5 near the object side is preferably 39.01mm, the radius of curvature of the curved surface of the fifth lens G5 near the image side is preferably 8.86mm, the thickness of the fifth lens G5 is 1.30mm, and the effective focal length of the fifth lens G5 is-16.811 mm.
The radius of curvature of the curved surface of the sixth lens G6 near the object side is preferably-46.35 mm, the radius of curvature of the curved surface of the sixth lens G6 near the image side is preferably-13.86 mm, the thickness of the sixth lens G6 is 2.25mm, and the effective focal length of the sixth lens G6 is 39.664mm.
Accordingly, the effective focal length of the cemented lens composed by the second lens G2 and the third lens G3 is-25.951 mm.
In this embodiment, the gap between the fifth lens G5 and the sixth lens G6 is preferably 20.2mm, and the distance between the sixth lens G6 and the imaging surface 200 is preferably 17.32mm.
Fig. 2 shows a schematic diagram of a field curvature corresponding to a lens structure in this embodiment, wherein in fig. 2, an abscissa indicates a field curvature size in mm and an ordinate indicates an image height. The distortion diagram corresponding to the lens structure is shown in fig. 3, the abscissa represents the distortion magnitude, the unit is percentage, and the ordinate represents the image height. The light aberration diagrams corresponding to different image heights of the lens structure are shown in fig. 4, wherein the abscissa represents the normalized entrance pupil coordinate, the ordinate represents the aberration size, and 6 groups of light aberration diagram combinations are combined in fig. 4, wherein in each group of combinations, the left diagram is meridian aberration, the right diagram is sagittal aberration, and IMA represents different image height values. As can be seen from fig. 2 to fig. 4, the lens has good structural aberration correction and low distortion, and can achieve a good imaging effect.
In this embodiment, the gap between the lenses refers to the distance between two adjacent curved surfaces of the two lenses on the optical axis. The distance between the lens and the diaphragm refers to the shortest distance between the curved surface of the lens and the diaphragm on the optical axis, namely the distance between the curved surface of the lens, which is close to the diaphragm, and the diaphragm on the optical axis.
In this embodiment, the thickness of each lens is related to the curvature and thickness of the lens curve and also to the distance of each lens, with different focal lengths at different lens curvatures and thicknesses. The working long distance can be realized by limiting the curvature radius and the thickness between the first lens G1 and the sixth lens G6 and the distance between each component, the size of the lens is small, additional space is provided for installing other fixture clamps, light sources and the like, and the lens also has enough numerical aperture, so that a high-resolution camera can be fully utilized, and the lens is perfectly matched with a general measuring system. In addition, the lens can also provide high telecentricity and low distortion, and meets the use requirement.
In general, the front lens group L1 and the rear lens group L2 of the invention form a symmetrical structure, so that the distortion of the lens can be eliminated, and the requirement of low distortion of the lens can be met. In addition, the lens structure and parameter definition of the invention can ensure the low distortion of the invention on the premise of ensuring a long working distance.
While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the appended claims.
Claims (7)
1. The high-magnification double-sided telecentric lens with long working distance is characterized by comprising a diaphragm, a front lens group with positive focal power and a rear lens group with negative focal power, wherein the front lens group, the diaphragm and the rear lens group are sequentially arranged along the incidence direction of light rays, and the rear focus of the front lens group is overlapped with the front focus of the rear lens group; the front lens group sequentially comprises a first lens with positive focal power, a second lens with positive focal power and a third lens with negative focal power from the object side to the image side, and the second lens and the third lens form a cemented lens; the rear lens group is composed of a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power in sequence from the object side to the image side, and the fourth lens and the fifth lens form a cemented lens.
2. The long working distance high magnification double-sided telecentric lens according to claim 1, wherein the curvature radius of the curved surface of the first lens near the object side is 46.69-51.16 mm, and the curvature radius of the curved surface of the first lens near the image side is: 56.56 to 51.18mm;
the curvature radius of the curved surface of the second lens close to the object space is as follows: 30.87-34.11 mm, wherein the curvature radius of the curved surface of the second lens close to the image space is-42.17 to-38.15 mm;
the curvature radius of the curved surface of the third lens close to the object space is as follows: -42.17 to-38.15 mm, wherein the curvature radius of the curved surface of the third lens close to the image space is 38.94 to 43.04mm.
3. The long working distance high magnification double sided telecentric lens of claim 2, wherein the thickness of said first lens is 4.09-4.52 mm, the thickness of said second lens is 4.51-4.99 mm, and the thickness of said third lens is 2.14-2.36 mm;
the gap between the first lens and the second lens is 0.19-0.21 mm, and the distance between the third lens and the diaphragm is 49.00-54.16 mm.
4. The long working distance high magnification double-sided telecentric lens of claim 1, wherein at least one of said first, second and third lenses has a dispersion coefficient greater than 80.
5. The long-working-distance high-magnification double-sided telecentric lens according to claim 1, wherein the curvature radius of the curved surface of the fourth lens near the object space is: 20.31-22.45 mm, wherein the curvature radius of the curved surface of the fourth lens close to the image space is 37.06-40.96 mm;
the curvature radius of the curved surface of the fifth lens close to the object space is as follows: 37.06-40.96 mm, wherein the curvature radius of the curved surface of the fifth lens close to the image space is 8.42-9.30 mm;
the curvature radius of the curved surface of the sixth lens close to the object space is as follows: -48.67 to-44.03 mm, and the curvature radius of the curved surface of the sixth lens close to the image space is-14.55 to-13.17 mm.
6. The long working distance high magnification double sided telecentric lens of claim 1, wherein the fourth lens has a thickness of 1.09-1.21 mm, the fifth lens has a thickness of 1.24-1.37 mm, and the sixth lens has a thickness of 2.14-2.36 mm;
the gap between the fifth lens and the sixth lens is 19.19-21.21 mm, and the distance between the sixth lens and the imaging surface is 16.45-18.19 mm.
7. The long working distance high magnification double-sided telecentric lens of claim 1, wherein at least one of said fourth, fifth and sixth lenses has a refractive index greater than 1.8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108594424A (en) * | 2018-06-05 | 2018-09-28 | 宾努克斯科技（佛山）有限公司 | A kind of zoomable doubly telecentric optical detection apparatus |
| CN109058934B (en) * | 2018-08-20 | 2024-01-02 | 广东奥普特科技股份有限公司 | High telecentricity parallel light source with emergent light diameter of 70mm |
| CN110072045B (en) * | 2019-05-30 | 2021-11-09 | Oppo广东移动通信有限公司 | Lens, camera and electronic equipment |
| CN113933978B (en) * | 2021-11-03 | 2023-03-21 | 广东奥普特科技股份有限公司 | Telecentric lens |
| CN114384676B (en) * | 2022-01-19 | 2023-05-05 | 广东奥普特科技股份有限公司 | Achromatic object space telecentric lens |
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