CN114114622B - High-definition zoom telecentric industrial lens - Google Patents
High-definition zoom telecentric industrial lens Download PDFInfo
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- CN114114622B CN114114622B CN202111449036.4A CN202111449036A CN114114622B CN 114114622 B CN114114622 B CN 114114622B CN 202111449036 A CN202111449036 A CN 202111449036A CN 114114622 B CN114114622 B CN 114114622B
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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
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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
Abstract
The invention discloses a high-definition zoom telecentric industrial lens, which comprises a first fixed optical component, a second fixed optical component, a diaphragm, a zoom optical component, a compensation optical component and a third fixed optical component which are sequentially arranged from an object side to an image side; the focal power of the first fixed optical component is negative, the focal power of the second fixed optical component is positive, the focal power of the variable-magnification optical component is negative, the focal power of the compensating optical component is positive, and the focal power of the third fixed optical component is positive; the variable magnification optical assembly is movable along an optical axis relative to the second fixed optical assembly for varying an optical system magnification, and the compensating optical assembly is movable along the optical axis relative to the third fixed optical assembly for achieving focus. The optical components are combined by arranging lenses with different structures, the focal power of each component is reasonably distributed, and the targets of large aperture and large target surface are realized while the high definition resolution is obtained.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to a high-definition zoom telecentric industrial lens.
Background
Along with development of industrial automation and popularization of application of machine vision, industrial lenses are widely applied to the fields of defect detection, size measurement, security monitoring and the like; in terms of machine vision detection, the telecentric lens is indispensable, and compared with a fixed-magnification telecentric lens, the continuous zoom telecentric lens can be applied to more complex scenes, so that the method has more advantages; however, there are a few problems with the continuous variable magnification telecentric lens currently on the market: the resolution is low, the resolution requirement of micro details cannot be met, the aperture is smaller, the system light quantity is small, the aperture is mostly F/8-22, the resolution capability of a lens is influenced while the brightness of a picture is influenced, and the imaging lens is small in target surface and low in compatibility, and is suitable for imaging chips.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a high-definition zoom telecentric industrial lens, which can solve the problems of low resolution, small aperture and small target surface of the existing lens.
The high-definition zoom telecentric industrial lens comprises a first fixed optical component, a second fixed optical component, a diaphragm STO, a zoom optical component, a compensating optical component and a third fixed optical component which are sequentially arranged from an object side to an image side;
the focal power of the first fixed optical component is negative, the focal power of the second fixed optical component is positive, the focal power of the variable-magnification optical component is negative, the focal power of the compensating optical component is positive, and the focal power of the third fixed optical component is positive; the variable magnification optical assembly is movable along an optical axis relative to the second fixed optical assembly for varying an optical system magnification, and the compensating optical assembly is movable along the optical axis relative to the third fixed optical assembly for achieving focus.
The high-definition zoom telecentric industrial lens provided by the embodiment of the invention has at least the following beneficial effects: the optical components are combined by arranging lenses with different structures, the focal power of each component is reasonably distributed, and the targets of large aperture and large target surface are realized while the high definition resolution is obtained.
According to some embodiments of the invention, the first stationary optical assembly comprises: a first lens having positive optical power; a second lens having positive optical power and disposed at a distance from the first lens; a third lens having positive optical power and disposed at a distance from the second lens; a fourth lens having negative optical power and disposed at a distance from the third lens;
the second stationary optical assembly includes: a fifth lens having positive optical power and disposed at a distance from the fourth lens; a sixth lens having negative optical power and constituting a cemented lens with the fifth lens; a seventh lens having positive optical power and disposed at an interval from the sixth lens;
the variable magnification optical assembly includes: an eighth lens having positive optical power and disposed at an interval from the seventh lens; a ninth lens having negative optical power and constituting a cemented lens with the eighth lens;
the compensating optical assembly includes: a tenth lens having positive optical power and disposed at an interval from the ninth lens; an eleventh lens having positive optical power and disposed at a distance from the tenth lens; a twelfth lens having positive optical power and disposed at a distance from the eleven lens; a thirteenth lens having negative optical power and constituting a cemented lens with the twelfth lens;
the third stationary optical assembly includes: a fourteenth lens having negative optical power and disposed at a distance from the thirteenth lens; a fifteenth lens having positive optical power and disposed at an interval from the fourteenth lens; a sixteenth lens having positive optical power and disposed at a distance from the fifteenth lens.
According to some embodiments of the invention, a surface of the first lens facing the object side is a plane, and a surface facing the image side is a convex surface; the surface of the second lens facing the object side is a convex surface, and the surface facing the image side is a concave surface; the surface of the third lens facing the object side is a convex surface, and the surface facing the image side is a concave surface; both surfaces of the fourth lens are concave surfaces; both surfaces of the fifth lens are convex surfaces; the surface of the sixth lens facing the object side is a concave surface, and the surface facing the image side is a plane; the seventh lens is concave on one surface facing the object side, and is convex on one surface facing the image side; the surface of the eighth lens facing the object side is a concave surface, and the surface facing the image side is a convex surface; both surfaces of the ninth lens are concave surfaces; both surfaces of the tenth lens are convex; both surfaces of the eleventh lens are convex; both surfaces of the twelfth lens are convex; both surfaces of the thirteenth lens are concave surfaces; the fourteenth lens is concave on one surface facing the object side, and is convex on one surface facing the image side; both surfaces of the fifteenth lens are convex surfaces; the sixteenth lens has a convex surface facing the object side and a concave surface facing the image side.
According to some embodiments of the invention, the high definition zoom telecentric industrial lens satisfies the following relationship
-10<f A /f B <-2；
-1.5<f C /f B <-0.5；
-0.9<f C /f D <-0.6；
1<f D /f B <2；
1.5<f E /f B <4；
5<TL/f B <15；
Wherein f A For the focal length of the first fixed optical component, f B For the focal length of the second fixed optical component, f C F is the focal length of the variable magnification optical component D To compensate for the focal length of the optical component, f E And TL is the object image conjugate distance of the high-definition zoom telecentric industrial lens for the focal length of the third fixed optical component.
According to some embodiments of the invention, the high definition zoom telecentric industrial lens satisfies the following relationship
Nd 1 ≤1.7；Nd 2 ≤1.7；
Nd 3 ≥1.6；Nd 4 ≥1.6；
Nd 5 ≤1.6；Nd 6 ≥1.7；
Nd 7 ≥1.7；Nd 8 ≥1.8；
Nd 9 ≥1.6；Nd 10 ≤1.8；
Nd 11 ≤1.7；Nd 12 ≤1.6；
Nd 13 ≥1.6；Nd 14 ≥1.7；
Nd 15 ≤1.6；Nd 16 ≥1.8；
Wherein Nd 1 For the refractive index of the first lens, nd 2 For the refractive index of the second lens, nd 3 For the refractive index of the third lens, nd 4 For the refractive index of the fourth lens, nd 5 For the refractive index of the fifth lens, nd 6 For the refractive index of the sixth lens, nd 7 For the refractive index of the seventh lens, nd 8 Refractive index of eighth lens, nd 9 Refractive index of the ninth lens, nd 10 Refractive index of tenth lens, nd 11 Refractive index of the eleventh lens, nd 12 Refractive index of twelfth lens, nd 13 For the refractive index of the thirteenth lens, nd 14 For the refractive index of the fourteenth lens, nd 15 Refractive index of fifteenth lens, nd 16 The refractive index of the sixteenth lens.
According to some embodiments of the invention, the high definition zoom telecentric industrial lens satisfies the following relationship
Vd 1 ≥50；Vd 2 ≥50；
Vd 3 ≥40；Vd 4 ≥40；
Vd 5 ≥50；Vd 6 ≤50；
Vd 7 ≤50；Vd 8 ≤30；
Vd 9 ≥30；Vd 10 ≥50；
Vd 11 ≥50；Vd 12 ≥50；
Vd 13 ≤30；Vd 14 ≤30；
Vd 15 ≥50；Vd 16 ≤30；
Wherein Vd is 1 Is the dispersion coefficient, vd, of the first lens 2 Is the dispersion coefficient of the second lens, vd 3 Is the dispersion coefficient of the third lens, vd 4 Is the dispersion coefficient of the fourth lens, vd 5 Is the dispersion coefficient of the fifth lens, vd 6 For the dispersion coefficient, vd, of the sixth lens 7 For the dispersion coefficient, vd, of the seventh lens 8 Is the dispersion coefficient of the eighth lens, vd 9 Is the dispersion coefficient of the ninth lens, vd 10 Is the dispersion coefficient of the tenth lens, vd 11 Is the dispersion coefficient, vd, of the eleventh lens 12 Is the dispersion coefficient of the twelfth lens, vd 13 For the dispersion coefficient, vd, of the thirteenth lens 14 Is the dispersion coefficient of the fourteenth lens, vd 15 Is the dispersion coefficient of the fifteenth lens, vd 16 Is the abbe number of the sixteenth lens.
According to some embodiments of the invention, the design wave band of the high-definition zoom telecentric industrial lens is 435-656 nm, the optical magnification is 0.3-0.8X, the zoom ratio is 1:2.7, and the object-image conjugate distance is 323mm.
According to some embodiments of the invention, the image sensor further includes a light sensing chip disposed near the image side and spaced apart from the sixteenth lens for capturing the imaging signal and forming an image.
According to some embodiments of the invention, a filter and a protective glass are sequentially disposed between the sixteenth lens and the photosensitive chip.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of a high definition zoom telecentric industrial lens according to an embodiment of the invention;
FIG. 2 is a graph showing the MTF of the system at 0.3X magnification in accordance with an embodiment of the present invention;
FIG. 3 is a graph showing the MTF of the system at 0.8X magnification in accordance with an embodiment of the present invention;
FIG. 4 is a dot column diagram of a system at 0.3 magnification in accordance with an embodiment of the present invention;
fig. 5 is a dot-column diagram of the system at 0.8X magnification in accordance with an embodiment of the present invention.
Reference numerals:
a first fixed optical component a, a second fixed optical component B, a stop STO, a variable magnification optical component C, a compensating optical component D, a third fixed optical component E, a first lens 1, a second lens 2, a third lens 3, a stop STO, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, a fifteenth lens 15, a sixteenth lens 16, a photosensitive chip 17, an optical filter 18, and a cover glass 19.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1, a high-definition zoom telecentric industrial lens according to an embodiment of the present disclosure includes a first fixed optical component a, a second fixed optical component B, a stop STO, a zoom optical component C, a compensating optical component D, and a third fixed optical component E sequentially disposed from an object side to an image side;
the focal power of each optical component in the lens has reasonable distribution proportion, the structural form is negative, positive, negative, positive and positive, the magnification of the optical system is changed by moving the position of the variable-power optical component C with negative focal power relative to the second fixed optical component B along the optical axis, focusing is realized by moving the position of the compensating optical component D with positive focal power relative to the third fixed optical component E along the optical axis, and the structural form is more favorable for correcting the field curvature of the optical system, so that the large-target-surface photosensitive chip is compatible.
Specifically, the optical power of the first fixed optical component a is negative, including: a first lens 1 having positive optical power; a second lens 2 having positive optical power and disposed at a distance from the first lens 1; a third lens 3 having positive optical power and disposed at a distance from the second lens 2; a fourth lens 4 having negative optical power and disposed at a distance from the third lens 3;
the optical power of the second fixed optical component B is positive, comprising: a fifth lens 5 having positive optical power and disposed at a distance from the fourth lens 4; a sixth lens 6 having negative optical power and constituting a cemented lens with the fifth lens 5; a seventh lens 7 having positive optical power and disposed at a distance from the sixth lens 6;
the focal power of the variable power optical component C is negative, and the variable power optical component C comprises: an eighth lens 8 having positive optical power and disposed at a distance from the seventh lens 7; a ninth lens 9 having negative optical power and constituting a cemented lens with the eighth lens 8;
the optical power of the compensating optical component D is positive, comprising: a tenth lens 10 having positive optical power and disposed at a distance from the ninth lens 9; an eleventh lens 11 having positive optical power and disposed at a distance from the tenth lens 10; a twelfth lens 12 having positive optical power and disposed at a distance from the eleven lens 11; a thirteenth lens 13 having negative optical power and constituting a cemented lens with the twelfth lens 12;
the third stationary optical component E has positive optical power, comprising: a fourteenth lens 14 having negative optical power and disposed at a distance from the thirteenth lens 13; a fifteenth lens 15 having positive optical power and disposed at a distance from the fourteenth lens 14; a sixteenth lens 16 having positive optical power and disposed at a distance from the fifteenth lens 15.
The optical components are combined by arranging the lenses with different structures, the focal power of each component is reasonably distributed, and the targets of large aperture and large target surface are realized while the high-definition resolution is obtained.
As shown in fig. 1, in some embodiments of the present invention, a surface of the first lens 1 facing the object side is a plane, and a surface facing the image side is a convex surface; the surface of the second lens 2 facing the object side is a convex surface, and the surface facing the image side is a concave surface; the surface of the third lens 3 facing the object side is a convex surface, and the surface facing the image side is a concave surface; both surfaces of the fourth lens 4 are concave surfaces; both surfaces of the fifth lens 5 are convex; the surface of the sixth lens 6 facing the object side is a concave surface, and the surface facing the image side is a plane; the seventh lens 7 has a concave surface facing the object side and a convex surface facing the image side; the eighth lens 8 has a concave surface facing the object side and a convex surface facing the image side; both surfaces of the ninth lens 9 are concave surfaces; both surfaces of the tenth lens 10 are convex; both surfaces of the eleventh lens 11 are convex; both surfaces of the twelfth lens 12 are convex; both surfaces of the thirteenth lens 13 are concave surfaces; the fourteenth lens 14 has a concave surface facing the object side and a convex surface facing the image side; both surfaces of the fifteenth lens 15 are convex; the sixteenth lens 16 has a convex surface on the object side and a concave surface on the image side. The surface of the eighth lens 8, which is close to the diaphragm, is bent to the diaphragm surface, so that the angle of incidence of light rays to the surface of the lens is reduced, the spherical aberration and the coma aberration of the system are reduced, and the high-definition resolution is realized.
In some embodiments of the present invention, the high definition zoom telecentric industrial lens satisfies the following relationship
-10<f A /f B <-2；
-1.5<f C /f B <-0.5；
-0.9<f C /f D <-0.6；
1<f D /f B <2；
1.5<f E /f B <4；
5<TL/f B <15；
Wherein f A For the focal length, f, of the first fixed optical component A B For the focal length, f, of the second fixed optical component B C F is the focal length of the variable magnification optical component C D To compensate for the focal length of the optical component D, f E And TL is the object image conjugate distance of the high-definition zoom telecentric industrial lens for the focal length of the third fixed optical component E.
After the light passes through the variable-magnification optical component C, the light height is increased, the caliber is increased, the rear group continuously uses 3 separated positive lenses to realize convergence, the light height is reduced, and meanwhile, the light beam caliber is reduced, so that the correction of the spherical aberration of the system is facilitated; the sixteenth lens 16 is a positive lens with large thickness, which is beneficial to balance of system field curvature and further improves the system resolution; the third fixed optical component E has a longer image distance from the image plane, and the incidence angle of the principal ray on the image plane is smaller, so that the relative illumination of the system is improved.
In some embodiments of the present invention, the high definition zoom telecentric industrial lens satisfies the following relationship
Nd 1 ≤1.7；Nd 2 ≤1.7；
Nd 3 ≥1.6；Nd 4 ≥1.6；
Nd 5 ≤1.6；Nd 6 ≥1.7；
Nd 7 ≥1.7；Nd 8 ≥1.8；
Nd 9 ≥1.6；Nd 10 ≤1.8；
Nd 11 ≤1.7；Nd 12 ≤1.6；
Nd 13 ≥1.6；Nd 14 ≥1.7；
Nd 15 ≤1.6；Nd 16 ≥1.8；
Wherein Nd 1 For the refractive index of the first lens 1, nd 2 For the refractive index of the second lens 2, nd 3 For the refractive index of the third lens 3, nd 4 For the refractive index of the fourth lens 4, nd 5 For the refractive index of the fifth lens 5, nd 6 For the refractive index of the sixth lens 6, nd 7 For the refractive index of the seventh lens 7, nd 8 For the refractive index of the eighth lens 8, nd 9 For the refractive index of the ninth lens 9, nd 10 Nd for refractive index of tenth lens 10 11 Nd for the refractive index of the eleventh lens 11 12 Nd for refractive index of twelfth lens 12 13 Nd for the refractive index of thirteenth lens 13 14 Nd for the refractive index of the fourteenth lens 14 15 For the refractive index of the fifteenth lens 15, nd 16 Is the refractive index of the sixteenth lens 16.
In some embodiments of the present invention, the high definition zoom telecentric industrial lens satisfies the following relationship
Vd 1 ≥50；Vd 2 ≥50；
Vd 3 ≥40；Vd 4 ≥40；
Vd 5 ≥50；Vd 6 ≤50；
Vd 7 ≤50；Vd 8 ≤30；
Vd 9 ≥30；Vd 10 ≥50；
Vd 11 ≥50；Vd 12 ≥50；
Vd 13 ≤30；Vd 14 ≤30；
Vd 15 ≥50；Vd 16 ≤30；
Wherein Vd is 1 For the dispersion coefficient, vd, of the first lens 1 2 Is the dispersion coefficient, vd, of the second lens 2 3 Is the dispersion coefficient, vd, of the third lens 3 4 For the dispersion coefficient, vd, of the fourth lens 4 5 For the dispersion coefficient, vd, of the fifth lens 5 6 For the dispersion coefficient, vd, of the sixth lens 6 7 For the dispersion coefficient, vd, of the seventh lens 7 8 For the dispersion coefficient of the eighth lens 8, vd 9 For the dispersion coefficient, vd, of the ninth lens 9 10 Is the dispersion coefficient Vd of the tenth lens 10 11 Is the dispersion coefficient Vd of the eleventh lens 11 12 For the dispersion coefficient, vd, of the twelfth lens 12 13 For the dispersion coefficient, vd, of the thirteenth lens 13 14 For the dispersion coefficient, vd, of the fourteenth lens 14 15 Is the dispersion coefficient, vd, of the fifteenth lens 15 16 Is the abbe number of the sixteenth lens 16.
In the embodiment, the lens combination structure meeting the refractive index relation is beneficial to realizing reasonable distribution of optical power, and can better balance spherical aberration, coma aberration and field curvature, so that the resolution of an optical system is improved, and a high-definition image is obtained; the plurality of lenses of the first fixed optical component A are made of glass materials with relatively low refractive index and relatively large dispersion coefficient, so that the bending degree of the surfaces of the lenses is reduced, and meanwhile, small chromatic aberration and spherical aberration are generated, and a good foundation is laid for correcting the rear group aberration; the seventh lens 7 is made of a high refractive index material, has larger focal power, has strong converging effect on light rays, and is next to the diaphragm STO, so that a larger clear aperture is easy to realize, and a large aperture is realized; the tenth lens 10 to the twelfth lens 12 of the compensating optical assembly are made of glass materials with lower Abbe numbers, so that the light height is reduced, and meanwhile, a proper shape is kept, and the lens is beneficial to forming smaller field curvature and spherical aberration under the low-magnification use condition, so that the resolution capability of the system is improved; the system uses a bonding lens group consisting of a fifth lens 5, a sixth lens 6, a twelfth lens 12 and a thirteenth lens 13, high-low dispersion materials are matched with each other, chromatic aberration of the system is corrected, and the lens resolving power is improved.
Further, in some embodiments of the present invention, a photosensitive chip 17 disposed near the image side is further included, which is disposed apart from the sixteenth lens 16, for capturing an imaging signal and forming an image.
In some embodiments of the present invention, a filter 18 and a cover glass 19 are sequentially disposed between the sixteenth lens 16 and the photosensitive chip 17. The optical filter 18 can filter a part of long waves and stray light, and prevent the photosensitive chip 17 from being interfered by infrared rays, so that the image quality is clear, and the color is bright; the protective glass 19 can protect the photosensitive chip 17 from direct damage by external force.
In some embodiments of the present invention, the design band of the high-definition zoom telecentric industrial lens is 435-656 nm, the optical magnification is 0.3X-0.8X, the zoom ratio is 1:2.7, the object-image conjugate distance is 323mm, when the magnification is 0.3X, fno=2.8, when the magnification is 0.8X, fno=7.2, and the zoom lens can be applied to 1/1.7″ target surface and photosensitive chips with a pixel size of 4.5 um.
The specific parameters of the lens of this embodiment are shown in the following table:
TABLE 1
In Table 1 above, the unit of radius R and thickness are both millimeters
The lens variable interval parameters of this embodiment are shown in the following table:
| magnification ratio | 0.3X | 0.35X | 0.4X | 0.45X | 0.5X | 0.55X | 0.6X | 0.7X | 0.8X |
| Diaphragm spacing | 2.503 | 6.221 | 9.264 | 11.984 | 13.556 | 15.278 | 16.770 | 19.241 | 21.217 |
| S17 interval | 46.695 | 39.885 | 34.050 | 27.859 | 24.184 | 19.969 | 16.098 | 9.166 | 3.059 |
| S24 interval | 13.481 | 16.573 | 19.365 | 22.835 | 24.939 | 27.433 | 29.811 | 34.273 | 38.403 |
TABLE 2
In table 2 above, the units of the surface intervals are millimeters;
fig. 2 to 5 are graphs showing optical performance at minimum and maximum magnifications for evaluating resolving power of an optical system according to an embodiment of the present invention. Wherein, fig. 2 is an MTF curve of the system at a magnification of 0.3X, fig. 3 is an MTF curve of the system at a magnification of 0.8X, fig. 4 is a dot column diagram of the system at a magnification of 0.3X, and fig. 5 is a dot column diagram of the system at a magnification of 0.8X, it can be seen from fig. 2 to 3 that all view fields MTF are larger than 0.3 at a position of 100l p/mm, and the resolution is excellent; it can be seen from fig. 4 to 5 that the central diffuse spots of the picture are smaller than 4.5um, the root mean square of the diffuse spots of the full view field is smaller than 9um, the light is well converged on the surface of the chip, the overall uniformity is good, and the definition and uniformity of the imaging picture can be ensured.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A high-definition zoom telecentric industrial lens is characterized in that: the optical system comprises a first fixed optical component (A), a second fixed optical component (B), a diaphragm STO, a variable magnification optical component (C), a compensating optical component (D) and a third fixed optical component (E) which are sequentially arranged from an object side to an image side;
the focal power of the first fixed optical component (A) is negative, the focal power of the second fixed optical component (B) is positive, the focal power of the variable-power optical component (C) is negative, the focal power of the compensating optical component (D) is positive, and the focal power of the third fixed optical component (E) is positive; the variable magnification optical assembly (C) is movable in position along an optical axis relative to the second fixed optical assembly (B) for varying an optical system magnification, and the compensating optical assembly (D) is movable in position along an optical axis relative to the third fixed optical assembly (E) for achieving focusing;
the first fixed optical component (a) includes, in order from an object side to an image side: a first lens (1) having positive optical power; a second lens (2) having positive optical power and disposed at a distance from the first lens (1); a third lens (3) having positive optical power and disposed at a distance from the second lens (2); a fourth lens (4) having negative optical power and disposed at a distance from the third lens (3);
the second fixed optical component (B) includes, in order from an object side to an image side: a fifth lens (5) having positive optical power and disposed at a distance from the fourth lens (4); a sixth lens (6) having negative optical power and constituting a cemented lens with the fifth lens (5); a seventh lens (7) having positive optical power and disposed at a distance from the sixth lens (6);
the variable magnification optical component (C) comprises the following components in sequence from an object side to an image side: an eighth lens (8) having positive optical power and disposed at a distance from the seventh lens (7); a ninth lens (9) having negative optical power and constituting a cemented lens with the eighth lens (8);
the compensating optical component (D) comprises the following components in sequence from an object side to an image side: a tenth lens (10) having positive optical power and disposed at a distance from the ninth lens (9); an eleventh lens (11) having positive optical power and disposed at a distance from the tenth lens (10); a twelfth lens (12) having positive optical power and disposed at a distance from the eleven lens (11); a thirteenth lens (13) having negative optical power and constituting a cemented lens with the twelfth lens (12);
the third fixed optical element (E) comprises, in order from the object side to the image side: a fourteenth lens (14) having negative optical power and disposed at a distance from the thirteenth lens (13); a fifteenth lens (15) having positive optical power and disposed at a distance from the fourteenth lens (14); a sixteenth lens (16) having positive optical power and disposed at a distance from the fifteenth lens (15).
2. The high definition variable magnification telecentric industrial lens of claim 1, wherein: the first lens (1) has a plane surface facing the object side and a convex surface facing the image side; the surface of the second lens (2) facing the object side is a convex surface, and the surface facing the image side is a concave surface; the surface of the third lens (3) facing the object side is a convex surface, and the surface facing the image side is a concave surface; both surfaces of the fourth lens (4) are concave surfaces; both surfaces of the fifth lens (5) are convex surfaces; the surface of the sixth lens (6) facing the object side is a concave surface, and the surface facing the image side is a plane; the surface of the seventh lens (7) facing the object side is a concave surface, and the surface facing the image side is a convex surface; the surface of the eighth lens (8) facing the object side is a concave surface, and the surface facing the image side is a convex surface; both surfaces of the ninth lens (9) are concave surfaces; both surfaces of the tenth lens (10) are convex; both surfaces of the eleventh lens (11) are convex surfaces; both surfaces of the twelfth lens (12) are convex surfaces; both surfaces of the thirteenth lens (13) are concave surfaces; the fourteenth lens (14) has a concave surface facing the object side and a convex surface facing the image side; both surfaces of the fifteenth lens (15) are convex surfaces; the sixteenth lens (16) has a convex surface on the object side and a concave surface on the image side.
3. The high definition variable magnification telecentric industrial lens of claim 1, wherein: the high-definition zoom telecentric industrial lens meets the following relational expression
-10<f A /f B <-2；
-1.5<f C /f B <-0.5；
-0.9<f C /f D <-0.6；
1<f D /f B <2；
1.5<f E /f B <4；
5<TL/f B <15；
Wherein f A For the focal length, f, of the first fixed optical component (A) B For the focal length of the second fixed optical component (B), f C For varying the focal length of the optical component (C), f D To compensate the focal length of the optical component (D), f E And TL is the object image conjugate distance of the high-definition zoom telecentric industrial lens for the focal length of the third fixed optical component (E).
4. The high definition variable magnification telecentric industrial lens of claim 1, wherein: the high-definition zoom telecentric industrial lens meets the following relational expression
Nd 1 ≤1.7；Nd 2 ≤1.7；
Nd 3 ≥1.6；Nd 4 ≥1.6；
Nd 5 ≤1.6；Nd 6 ≥1.7；
Nd 7 ≥1.7；Nd 8 ≥1.8；
Nd 9 ≥1.6；Nd 10 ≤1.8；
Nd 11 ≤1.7；Nd 12 ≤1.6；
Nd 13 ≥1.6；Nd 14 ≥1.7；
Nd 15 ≤1.6；Nd 16 ≥1.8；
Wherein Nd 1 Is the refractive index of the first lens (1), nd 2 Is the refractive index of the second lens (2), nd 3 Is the refractive index of the third lens (3), nd 4 Is the refractive index of the fourth lens (4), nd 5 Is the refractive index of the fifth lens (5), nd 6 Is the refractive index of the sixth lens (6), nd 7 For the refractive index of the seventh lens (7), nd 8 A refractive index of the eighth lens (8), nd 9 A refractive index Nd of the ninth lens (9) 10 Is the refractive index of the tenth lens (10), nd 11 Is the refractive index of the eleventh lens (11), nd 12 For the refractive index of the twelfth lens (12), nd 13 For the refractive index of the thirteenth lens (13), nd 14 For the refractive index of the fourteenth lens (14), nd 15 A refractive index Nd of a fifteenth lens (15) 16 Is the refractive index of the sixteenth lens (16).
5. The high definition variable magnification telecentric industrial lens of claim 1, wherein: the high-definition zoom telecentric industrial lens meets the following relational expression
Vd 1 ≥50；Vd 2 ≥50；
Vd 3 ≥40；Vd 4 ≥40；
Vd 5 ≥50；Vd 6 ≤50；
Vd 7 ≤50；Vd 8 ≤30；
Vd 9 ≥30；Vd 10 ≥50；
Vd 11 ≥50；Vd 12 ≥50；
Vd 13 ≤30；Vd 14 ≤30；
Vd 15 ≥50；Vd 16 ≤30；
Wherein Vd is 1 Is the dispersion coefficient, vd, of the first lens (1) 2 Is the dispersion coefficient, vd, of the second lens (2) 3 Is the dispersion coefficient, vd, of the third lens (3) 4 Is the dispersion coefficient, vd, of the fourth lens (4) 5 Is the dispersion coefficient, vd, of the fifth lens (5) 6 Is the dispersion coefficient, vd, of the sixth lens (6) 7 Is the dispersion coefficient, vd, of the seventh lens (7) 8 Is the dispersion coefficient, vd, of the eighth lens (8) 9 Is the dispersion coefficient, vd, of the ninth lens (9) 10 Is the dispersion coefficient, vd, of the tenth lens (10) 11 Is the dispersion coefficient, vd, of the eleventh lens (11) 12 Is the dispersion coefficient, vd, of the twelfth lens (12) 13 Is the dispersion coefficient, vd, of the thirteenth lens (13) 14 Is the dispersion coefficient, vd, of the fourteenth lens (14) 15 Is the dispersion coefficient, vd, of the fifteenth lens (15) 16 Is the dispersion coefficient of the sixteenth lens (16).
6. The high definition variable magnification telecentric industrial lens of claim 1, wherein: the design wave band of the high-definition zoom telecentric industrial lens is 435-656nm, the optical magnification is 0.3-0.8X, the zoom ratio is 1:2.7, and the object-image conjugate distance is 323mm.
7. The high definition variable magnification telecentric industrial lens of claim 1, wherein: also included is a photosensitive chip (17) disposed near the image side, spaced from the sixteenth lens (16), for capturing imaging signals and forming an image.
8. The high definition variable magnification telecentric industrial lens of claim 7, wherein: a filter (18) and a protective glass (19) are arranged between the sixteenth lens (16) and the photosensitive chip (17) in sequence.
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| CN106772964B (en) * | 2014-08-06 | 2019-12-27 | 歌尔科技有限公司 | Zoom lens |
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| JP2000321496A (en) * | 1999-05-10 | 2000-11-24 | Canon Inc | Zoom lens |
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| CN114114622A (en) | 2022-03-01 |
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