CN109633875B - Telecentric lens capable of continuously changing magnification - Google Patents
Telecentric lens capable of continuously changing magnification Download PDFInfo
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- CN109633875B CN109633875B CN201910031815.9A CN201910031815A CN109633875B CN 109633875 B CN109633875 B CN 109633875B CN 201910031815 A CN201910031815 A CN 201910031815A CN 109633875 B CN109633875 B CN 109633875B
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- 238000001514 detection method Methods 0.000 abstract description 8
- 238000005259 measurement Methods 0.000 abstract description 4
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
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- G—PHYSICS
- G02—OPTICS
- 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 belongs to the technical field of optical devices, and particularly relates to a telecentric lens capable of continuously changing magnification, which comprises a first lens group S1, a second lens group S2, a third lens group S3 and a fourth lens group S4 which are sequentially arranged from an object end to an image surface, wherein the combined focal length of the first lens group S1 is fS1; the combined focal length of the second lens group S2 is fS2; the combined focal length of the third lens group S3 is fS3; the combined focal length of the fourth lens group S4 is fS4, and the relations are respectively satisfied: 0.4< |fS2/fS1| <0.7,0.15< |fS3/fS1| <0.4,0.8< |fS4/fS1| <1.2. Compared with the prior art, the invention realizes the conversion between the high magnification and the low magnification of the lens through the functions of the plurality of lens groups and the diaphragms, has small optical distortion after lens switching, can meet the detection requirements of different fields of view, and improves the accuracy of measurement.
Description
Technical Field
The invention belongs to the technical field of optical devices, and particularly relates to a telecentric lens capable of continuously changing magnification.
Background
The telecentric lens is designed for correcting parallax of the traditional industrial lens, and can ensure that the obtained image magnification is unchanged within a certain object distance range. The unique advantage makes telecentric lens widely applied to occasions with high-precision industrial requirements such as optical detection equipment, workpiece measurement, precision positioning and the like.
With the continuous development of industry, precision of precision detection is gradually improved, and convenience in accuracy and operation is also increased. In facing these demands, existing telecentric lenses suffer from the following disadvantages:
1. for a fixed-magnification telecentric lens, the detection field of view is single, only workpieces with specific sizes can be detected, when the application requirement changes, the telecentric lens with different magnifications needs to be replaced and the correction is repeated, and the working procedure is complicated.
2. The continuous zoom telecentric lens often has deviation between the measured value and the standard value at the same position due to poor telecentricity, so that the detection precision is reduced. Therefore, the development of the object-side telecentric lens with high telecentricity is urgent for continuous magnification variation.
Disclosure of Invention
The invention aims at: aiming at the defects of the prior art, the provided telecentric lens capable of continuously changing the magnification can meet the detection requirements of different visual fields, is designed for telecentricity of an object space, has high telecentricity, and fundamentally improves the accuracy of measurement.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a telecentric lens capable of continuously varying magnification comprises a first lens group S1 with positive focal power, a second lens group S2 with negative focal power, a third lens group S3 with positive focal power and a fourth lens group S4 with positive focal power, which are sequentially arranged from an object end to an image surface
The first lens group S1 and the third lens group S3 are both fixedly arranged, the second lens group S2 and the fourth lens group S4 are both movably arranged, and when the lens is changed from low magnification to high magnification, the second lens group S2 moves in a direction away from the first lens group S1, and simultaneously, the fourth lens group S4 also moves in a direction away from the third lens group S3; when the lens is changed from high magnification to low magnification, the second lens group S2 approaches to the direction of the first lens group S1, and meanwhile, the fourth lens group S4 also approaches to the direction of the third lens group S3; the combined focal length of the first lens group S1 is fS1; the combined focal length of the second lens group S2 is fS2; the combined focal length of the third lens group S3 is fS3; the combined focal length of the fourth lens group S4 is fS4, and the relations are respectively satisfied: 0.4< |fS2/fS1| <0.7,0.15< |fS3/fS1| <0.4,0.8< |fS4/fS1| <1.2.
As an improvement of the continuously variable magnification telecentric lens, the first lens group S1 comprises a first lens G1 with negative focal power and a meniscus structure, which are sequentially arranged from the object side to the image side; a second lens G2 having a positive optical power and a biconvex structure; a third lens G3 having a negative power and a meniscus configuration; the fourth lens G4 having positive focal power and a meniscus structure, wherein the first lens G1 and the second lens G2 are cemented to form a first cemented lens group U1 having positive focal power, and a focal length of the first cemented lens group is fU1 and satisfies the relationship: 0.6< |fU1/fS1| <1.
As an improvement of the telecentric lens capable of continuously changing magnification, the second lens group S2 comprises a fifth lens G5 with positive focal power and biconvex structure, which is arranged from the object side to the image side in sequence; a sixth lens G6 having a negative power and a biconcave structure; a seventh lens G7 having positive power and a meniscus structure, wherein the sixth lens G6 and the seventh lens G7 are cemented to form a second cemented lens group U2 having negative power, and a focal length of the second cemented lens group is fU2 and satisfies the relation: 0.3< |fU2/fS2| <0.5.
As an improvement of the telecentric lens capable of continuously varying magnification, the third lens group S3 comprises an eighth lens G8 with positive focal power and biconvex structure, which is arranged from the object side to the image side in sequence; a ninth lens G9 having a negative power and a meniscus configuration; a 10 th lens G10 having a positive power, biconvex structure; an eleventh lens G11 having a negative power, a biconcave structure, wherein the eighth lens G8 and the ninth lens G9 are cemented to form a third cemented lens group U3 having a positive power; the tenth lens G10 and the eleventh lens G11 are cemented to form a fourth cemented lens group U4 having negative optical power; the focal length of the third cemented lens group is fU3, the focal length of the fourth cemented lens group is fU4, and the relations are respectively satisfied: 1< |fU3/fS3| <1.4, 70< |fU4/fS3| <90.
As an improvement of the telecentric lens capable of continuously changing magnification, the fourth lens group S4 comprises a twelfth lens G12 with negative focal power and a meniscus structure, which is arranged from the object side to the image side in sequence; a thirteenth lens G13 having a negative power, biconcave structure; a fourteenth lens G14 having a positive optical power, a biconvex structure, wherein the thirteenth lens G13 and the fourteenth lens G14 are cemented to form a fifth cemented lens group U5 having a positive optical power; the focal length of the fifth cemented lens group is fU5, and satisfies the relation: 0.3< |fU5/fS4| <0.7.
As an improvement of the continuously variable magnification telecentric lens according to the present invention, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, the ninth lens G9, the tenth lens G10, the eleventh lens G11, the twelfth lens G12, the thirteenth lens G13 and the fourteenth lens G14 are spherical mirrors.
As an improvement of the continuously variable magnification telecentric lens according to the present invention, a stop is further included, which is disposed between the second lens group S2 and the third lens group S3.
As an improvement of the continuously variable magnification telecentric lens of the present invention, the air space between the first lens group S1 and the second lens group S2 is D1, the air space between the second lens group S2 and the stop is D2, the air space between the third lens group S3 and the fourth lens group S4 is D3, the air space between the fourth lens group S4 and the image plane is D4, they satisfy the relation: 0.5< | (d1+d2)/(d3+d4) | <0.8.
As an improvement of the telecentric lens capable of continuously zooming, the aperture of the diaphragm is circular, and the position of the diaphragm is fixed in the zooming process of the lens.
As an improvement of the telecentric lens capable of continuously changing the magnification, the aperture range of the diaphragm is F8.0-F32.
The invention has the beneficial effects that: compared with the prior art, the invention realizes the conversion between the high magnification and the low magnification of the lens through the functions of the plurality of lens groups and the diaphragms, has small optical distortion after lens switching, can meet the detection requirements of different fields of view, and fundamentally improves the accuracy of measurement.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a light path diagram of the present invention;
FIG. 3 is a graph showing the change from low power to high power of the lens according to the present invention;
FIG. 4 is a graph of distortion at low magnification for the present invention;
FIG. 5 is a graph of the distortion of the present invention at high magnification;
wherein, 1-diaphragm.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The present invention will be described in further detail below with reference to the drawings, but is not limited thereto.
As shown in fig. 1 to 5, a telecentric lens capable of continuously changing magnification comprises a first lens group S1 with positive focal power, a second lens group S2 with negative focal power, a third lens group S3 with positive focal power and a fourth lens group S4 with positive focal power, which are sequentially arranged from an object end to an image surface, wherein the first lens group S1 and the third lens group S3 are fixedly arranged, the second lens group S2 and the fourth lens group S4 are movably arranged, and when the lens is changed from low magnification to high magnification, the second lens group S2 moves in a direction away from the first lens group S1, and meanwhile, the fourth lens group S4 also moves in a direction away from the third lens group S3; when the lens is changed from high magnification to low magnification, the second lens group S2 approaches in the direction of the first lens group S1, and at the same time, the fourth lens group S4 also approaches in the direction of the third lens group S3; the combined focal length of the first lens group S1 is fS1; the combined focal length of the second lens group S2 is fS2; the combined focal length of the third lens group S3 is fS3; the combined focal length of the fourth lens group S4 is fS4, and the relations are respectively satisfied: 0.4< |fS2/fS1| <0.7,0.15< |fS3/fS1| <0.4,0.8< |fS4/fS1| <1.2.
Preferably, the first lens group S1 includes a first lens G1 having a negative power and a meniscus structure, which are sequentially disposed from an object side to an image side; a second lens G2 having a positive optical power and a biconvex structure; a third lens G3 having a negative power and a meniscus configuration; the fourth lens G4 with positive focal power and a meniscus structure, where the first lens G1 and the second lens G2 are cemented to form a first cemented lens group U1 with positive focal power, and the focal length of the first cemented lens group is fU1 and satisfies the relation: 0.6< |fU1/fS1| <1.
Preferably, the second lens group S2 includes a fifth lens G5 having positive power and a biconvex structure, which is sequentially disposed from an object side to an image side; a sixth lens G6 having a negative power and a biconcave structure; a seventh lens G7 having positive power and a meniscus structure, wherein the sixth lens G6 and the seventh lens G7 are cemented to form a second cemented lens group U2 having negative power, and the focal length of the second cemented lens group is fU2 and satisfies the relation: 0.3< |fU2/fS2| <0.5.
Preferably, the third lens group S3 includes an eighth lens G8 having a positive power, a biconvex structure, which is disposed in order from the object side to the image side; a ninth lens G9 having a negative power and a meniscus configuration; a 10 th lens G10 having a positive power, biconvex structure; an eleventh lens G11 having a negative power, biconcave structure, wherein the eighth lens G8 and the ninth lens G9 are cemented to form a third cemented lens group U3 having a positive power; the tenth lens G10 and the eleventh lens G11 are cemented to form a fourth cemented lens group U4 having negative optical power; the focal length of the third cemented lens group is fU3, and the focal length of the fourth cemented lens group is fU4, which satisfy the relation: 1< |fU3/fS3| <1.4, 70< |fU4/fS3| <90.
Preferably, the fourth lens group S4 includes a twelfth lens G12 having a negative power and a meniscus configuration, which is disposed in order from the object side to the image side; a thirteenth lens G13 having a negative power, biconcave structure; a fourteenth lens G14 having a positive optical power, a biconvex structure, wherein the thirteenth lens G13 and the fourteenth lens G14 are cemented to form a fifth cemented lens group U5 having a positive optical power; the focal length of the fifth cemented lens group is fU5, and satisfies the relation: 0.3< |fU5/fS4| <0.7.
Preferably, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens G6, the seventh lens G7, the eighth lens G8, the ninth lens G9, the tenth lens G10, the eleventh lens G11, the twelfth lens G12, the thirteenth lens G13, and the fourteenth lens G14 are spherical mirrors.
Preferably, a stop 1 is further included, the stop 1 being disposed between the second lens group S2 and the third lens group S3.
Preferably, the air space between the first lens group S1 and the second lens group S2 is D1, the air space between the second lens group S2 and the stop 1 is D2, the air space between the third lens group S3 and the fourth lens group S4 is D3, the air space between the fourth lens group S4 and the image plane is D4, and they satisfy the relation: 0.5< | (d1+d2)/(d3+d4) | <0.8.
Preferably, the aperture of the diaphragm 1 is circular, and the position of the diaphragm 1 is fixed in the zooming process of the lens.
Preferably, the aperture range of the diaphragm 1 is F8.0 to F32.
In this embodiment, the data of the lens are as follows:
in this example, the aperture of the lens is f# =8.0, the combined focal length fS1 of the first lens group S1 is 87.32mm, the combined focal length fS2 of the second lens group S2 is-56.22 mm, the combined focal length fS3 of the third lens group S3 is 29.04mm, the combined focal length fS4 of the fourth lens group S4 is 88.04mm, the focal length fu1= 68.55mm of the first cemented lens group, the focal length fu2= -24.31mm of the second cemented lens group, the focal length fu3=34.59 mm of the third cemented lens group, the focal length fu4= -2476.94mm of the fourth cemented lens group, and the focal length fu5=43.60 mm of the fifth cemented lens group. In a low magnification state, an air space D1 between the first lens group S1 and the second lens group S2 is 3.00mm, an air space D2 between the second lens group S2 and the diaphragm 1 is 23.00mm, an air space D3 between the third lens group S3 and the fourth lens group S4 is 3.00mm, and an air space D4 between the fourth lens group S4 and the image plane is 35.57mm; in the high magnification state, the air space D1 between the first lens group S1 and the second lens group S2 is 22.58mm, the air space D2 between the second lens group S2 and the stop 1 is 3.43mm, the air space D3 between the third lens group S3 and the fourth lens group S4 is 23.56mm, and the air space D4 between the fourth lens group S4 and the image plane is 15.01mm.
Each relation: |fs2/fs1|=0.64; |fs3/fs1|=0.33; |fs4/fs1|=1.00; | (d1+d2)/(d3+d4) |=0.67; |fu1/fs1|=0.79; |fu2/fs2|=0.43; |fu3/fs3|=1.23; |fu4/fs3|= 85.29; |fu5/fs4|=0.50; all satisfy the relation: 0.4< |fS2/fS1| <0.7;0.15< |fS3/fS1| <0.4;0.8< |fS4/fS1| <1.2;0.5< | (d1+d2)/(d3+d4) | <0.8;0.6< |fU1/fS1| <1;0.3< |fU2/fS2| <0.5;1< |fU3/fS3| <1.4;70< |fU4/fS3| <90;0.3< |fU5/fS4| <0.7.
FIG. 4 is a graph showing the optical distortion at low magnification for the present embodiment, with the maximum optical distortion being less than 0.025% over the full field of view;
FIG. 5 is a graph showing the optical distortion at high magnification for the present embodiment, with the maximum optical distortion being less than 0.03% over the full field of view;
as can be seen from FIGS. 4 and 5, the invention can adapt to low magnification of 0.5X and high magnification of 1.0X, has strong adaptability, and simultaneously has small optical distortion, can meet the detection requirements of different fields of view, has high accuracy, and greatly meets the industrial requirements.
While the foregoing description illustrates and describes several preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (6)
1. A telecentric lens capable of continuously zooming, characterized in that: comprises a first lens group S1 with positive focal power, a second lens group S2 with negative focal power, a third lens group S3 with positive focal power and a fourth lens group S4 with positive focal power which are sequentially arranged from an object end to an image surface,
the first lens group S1 and the third lens group S3 are both fixedly arranged, the second lens group S2 and the fourth lens group S4 are both movably arranged, and when the lens is changed from low magnification to high magnification, the second lens group S2 moves in a direction away from the first lens group S1, and simultaneously, the fourth lens group S4 also moves in a direction away from the third lens group S3; when the lens is changed from high magnification to low magnification, the second lens group S2 approaches to the direction of the first lens group S1, and meanwhile, the fourth lens group S4 also approaches to the direction of the third lens group S3; the combined focal length of the first lens group S1 is fS1; the combined focal length of the second lens group S2 is fS2; the combined focal length of the third lens group S3 is fS3; the combined focal length of the fourth lens group S4 is fS4, and the relations are respectively satisfied: 0.4< |fS2/fS1| <0.7,0.15< |fS3/fS1| <0.4,0.8< |fS4/fS1| <1.2;
the first lens group S1 comprises a first lens G1 with negative focal power and a meniscus structure, which are sequentially arranged from an object side to an image side; a second lens G2 having a positive optical power and a biconvex structure; a third lens G3 having a negative power and a meniscus configuration; the fourth lens G4 having positive focal power and a meniscus structure, wherein the first lens G1 and the second lens G2 are cemented to form a first cemented lens group U1 having positive focal power, and a focal length of the first cemented lens group is fU1 and satisfies the relationship: 0.6< |fU1/fS1| <1; the second lens group S2 comprises a fifth lens G5 with positive focal power and a biconvex structure, which is sequentially arranged from an object side to an image side; a sixth lens G6 having a negative power and a biconcave structure; a seventh lens G7 having positive power and a meniscus structure, wherein the sixth lens G6 and the seventh lens G7 are cemented to form a second cemented lens group U2 having negative power, and a focal length of the second cemented lens group is fU2 and satisfies the relation: 0.3< |fU2/fS2| <0.5.
2. The continuously variable magnification telecentric lens of claim 1, wherein: the fourth lens group S4 includes a twelfth lens G12 having a negative power and a meniscus configuration, which are sequentially disposed from the object side to the image side; a thirteenth lens G13 having a negative power, biconcave structure; a fourteenth lens G14 having a positive optical power, a biconvex structure, wherein the thirteenth lens G13 and the fourteenth lens G14 are cemented to form a fifth cemented lens group U5 having a positive optical power; the focal length of the fifth cemented lens group is fU5, and satisfies the relation: 0.3< |fU5/fS4| <0.7.
3. The continuously variable magnification telecentric lens of claim 1, wherein: also comprises a diaphragm (1), wherein the diaphragm (1) is arranged between the second lens group S2 and the third lens group S3.
4. A continuously variable magnification telecentric lens according to claim 3, wherein: the air interval between the first lens group S1 and the second lens group S2 is D1, the air interval between the second lens group S2 and the diaphragm (1) is D2, the air interval between the third lens group S3 and the fourth lens group S4 is D3, the air interval between the fourth lens group S4 and the image plane is D4, and they satisfy the relation: 0.5< | (d1+d2)/(d3+d4) | <0.8.
5. A continuously variable magnification telecentric lens according to claim 3, wherein: the aperture of the diaphragm (1) is circular, and the position of the diaphragm (1) is fixed in the zooming process of the lens.
6. A continuously variable magnification telecentric lens according to claim 3, wherein: the aperture range of the diaphragm (1) is F8.0-F32.
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