CN117991482B - High-zoom-ratio sighting telescope optical system - Google Patents
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Abstract
The invention provides a high-zoom-ratio sighting telescope optical system, which relates to the technical field of optical imaging and comprises an objective lens group, a steering group and an eyepiece lens group which are sequentially arranged from an object side to an image side along an optical axis, wherein the objective lens group comprises a first lens, a second lens, a third lens and a fourth lens, and the objective lens group is sequentially arranged from the object side to the image side along the optical axis; the steering group comprises a field lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, a first glass plate and a second glass plate, and the steering groups are sequentially arranged from an object side to an image side along an optical axis; the eyepiece group comprises an eleventh lens, a twelfth lens and a thirteenth lens, and the eyepiece group is sequentially arranged from an object side to an image side along the optical axis. The invention is beneficial to improving the imaging quality of the high-zoom-ratio sighting telescope optical system under various multiplying powers and view fields.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a high-zoom-ratio sighting telescope optical system.
Background
Aiming devices are an important component of firearms by which a target can be shot more accurately. With the continuous and deep research of the optical system of the sighting telescope, the performance of the sighting device is also continuously developed. An optical sighting device is an optical instrument used for aiming at a target and giving the weapon itself accurate shooting. The optical sighting telescope itself has many optical parameters, such as: the exit pupil diameter, the exit pupil distance and the magnification of the sighting telescope; the relative distortion, the division inclination and the image inclination of the sighting telescope on the target identification accuracy are affected; and evaluating zero walking amount of the stability of the optical sighting device.
Chinese patent publication No. CN116952064a discloses a wide-line-of-sight low-illuminance telescope optical system including an objective lens optical system and an eyepiece optical system; the objective optical system comprises an objective first lens, an objective first bonding lens, an objective fourth lens, an objective fifth lens and an objective second bonding lens which are sequentially arranged from the light incident direction to the light emergent direction; the ocular optical system comprises an ocular first cemented lens, an ocular third lens, an ocular fourth lens and an ocular fifth lens which are sequentially arranged from the light incident direction to the light emergent direction. However, in the above-mentioned scheme, it is difficult for a designer with an excessively large zoom ratio to consider performance indexes at each magnification, and there is often a case where the variation range of the exit pupil distance is excessively large or distortion is serious at a certain magnification.
Disclosure of Invention
In view of this, the present invention provides a high-zoom-ratio telescope optical system, which can correct on-axis spherical aberration of the optical system and make incident light smoothly transition by reasonably configuring refractive powers of thirteen lenses in the high-zoom-ratio telescope optical system, so as to improve imaging quality of the high-zoom-ratio telescope optical system under each magnification and view field.
The invention provides a high-zoom-ratio sighting telescope optical system, which comprises an objective lens group, a steering group and an eyepiece group which are sequentially arranged from an object side to an image side along an optical axis,
The objective lens group comprises a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power and a fourth lens with positive refractive power, and the first lens, the second lens, the third lens and the fourth lens are sequentially arranged from an object side to an image side along an optical axis;
The steering group includes a field lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, a seventh lens having negative refractive power, an eighth lens having positive refractive power, a ninth lens having negative refractive power, a tenth lens having negative refractive power, a first glass plate, and a second glass plate, the field lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the first glass plate, and the second glass plate being disposed in order from an object side to an image side along an optical axis;
The eyepiece lens group comprises an eleventh lens with negative refractive power, a twelfth lens with positive refractive power and a thirteenth lens with positive refractive power, and the eleventh lens, the twelfth lens and the thirteenth lens are sequentially arranged from an object side to an image side along an optical axis;
The Gao Bianbei-ratio scope optical system satisfies the following conditional expression:
43.75＜F1＜45.23；
8.17＜F2＜460.27；
42.13＜F3＜46.39；
0.94≤F1/F3≤1.07；
Wherein F 1 denotes a focal length of the objective lens group, F 2 denotes a focal length of the steering group, and F 3 denotes a focal length of the eyepiece group.
On the basis of the above technical solution, preferably, the object-side paraxial region of the first lens element is a convex surface, the image-side paraxial region of the first lens element is a convex surface, the object-side paraxial region of the second lens element is a concave surface, the image-side paraxial region of the second lens element is a convex surface, the object-side paraxial region of the third lens element is a convex surface, the image-side paraxial region of the third lens element is a concave surface, the object-side paraxial region of the fourth lens element is a convex surface, the image-side paraxial region of the fourth lens element is a concave surface, the object-side paraxial region of the field lens element is a convex surface, the image-side paraxial region of the fifth lens element is a concave surface, the object-side paraxial region of the sixth lens element is a convex surface, the object-side paraxial region of the sixth lens element is convex, the object-side paraxial region of the seventh lens element is concave, the object-side paraxial region of the eighth lens element is convex, the image-side paraxial region of the eighth lens element is convex, the object-side paraxial region of the ninth lens element is concave, the image-side paraxial region of the ninth lens element is convex, the object-side paraxial region of the tenth lens element is concave, the image-side paraxial region of the tenth lens element is concave, the object-side paraxial region of the eleventh lens element is concave, the image-side paraxial region of the eleventh lens element is concave, the object-side paraxial region of the twelfth lens element is convex, the image-side paraxial region of the twelfth lens element is convex, the object-side paraxial region of the thirteenth lens element is convex, the thirteenth lens element has a convex image-side paraxial region.
On the basis of the above technical solution, preferably, the first lens and the second lens form a first cemented lens, the fifth lens and the sixth lens form a second cemented lens, the seventh lens and the eighth lens form a third cemented lens, the ninth lens and the tenth lens form a fourth cemented lens, and the eleventh lens and the twelfth lens form a fifth cemented lens.
Still further preferably, the Gao Bianbei further satisfies the following than the scope optical system:
3.22≤T1≤53.69
7.06≤T2≤14.65
7.36≤T3≤50.23
Wherein T 1 represents a variable pitch between the field lens and the second cemented lens, T 2 represents a variable pitch between the second cemented lens and the third cemented lens, and T 3 represents a variable pitch between the third cemented lens and the fourth cemented lens.
Still further preferably, the Gao Bianbei is longer than the total length of the scope optical system:
232.91<TTL<236.53
Wherein TTL represents the total optical length of the Gao Bianbei than the scope optical system.
Still further preferably, the Gao Bianbei is smaller than the scope optical system by 1 time, and the total length of the optical system and the effective focal length of the optical system meet the following conditions:
4.93≤TTL/Fa1≤5.90
wherein TTL represents the total optical length of the Gao Bianbei-fold and F a1 represents the effective focal length of the Gao Bianbei-fold zoom lens system.
Still further preferably, the Gao Bianbei is smaller than the sighting telescope optical system by 6 times, and the total length of the optical system and the effective focal length of the optical system meet the following conditions:
0.54≤TTL/Fa2≤1.17
wherein TTL represents the total optical length of the Gao Bianbei-fold and F a2 represents the effective focal length of the Gao Bianbei-fold zoom lens system.
Still further preferably, the ratio of the effective focal length of the optical system to the entrance pupil aperture of the optical system at 1-fold zoom of Gao Bianbei compared to the scope optical system satisfies the following condition:
4.33≤Fa1/D1≤5.37
Wherein f a1 represents the effective focal length of the Gao Bianbei-to-scope optical system at 1-fold zoom, and D 1 represents the entrance pupil aperture of the Gao Bianbei-to-scope optical system at 1-fold zoom.
Still further preferably, the ratio of the effective focal length of the optical system to the entrance pupil aperture of the optical system at 6 times zoom of the Gao Bianbei compared to the scope optical system satisfies the following condition:
11.08≤Fa2/D2≤12.12
Wherein F a2 represents the effective focal length of the Gao Bianbei-to-scope optical system at 6-fold zoom, and D 2 represents the entrance pupil aperture of the Gao Bianbei-to-scope optical system at 6-fold zoom.
Still further preferably, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, and the thirteenth lens are spherical lenses.
Compared with the prior art, the high-zoom-ratio sighting telescope optical system provided by the invention has the following beneficial effects:
(1) By reasonably configuring the refractive power of thirteen lenses in the high-transformation-ratio sighting telescope optical system, namely setting the first lens with positive refractive power and the second lens with negative refractive power, combining the positive lens and the negative lens can be favorable for correcting the on-axis spherical aberration of the optical system, when light enters the third lens with positive refractive power, the object side surface and the image side surface of the third lens are both convex surfaces at the paraxial region, the light collected by the first lens and the second lens can be compressed, so that the incident light is smoothly transited, the eighth lens can have convex and concave surfaces, the relative illuminance of an edge view field can be favorably improved to avoid the generation of a dark angle, the imaging quality of the optical system can be improved, the ninth lens can have negative refractive power, the imaging area of the optical system can be favorably increased, various aberrations generated by the eighth lens can be balanced, and the imaging quality of the optical system can be improved, so that the imaging quality of the high-transformation-ratio sighting telescope optical system under various magnifications and view fields can be improved;
(2) The distance between the field lens and the second bonding lens, the distance between the second bonding lens and the third bonding lens and the distance between the third bonding lens and the fourth bonding lens are adjusted, so that the continuous magnification of 6 times of the magnification ratio in the high-magnification-ratio sighting telescope optical system is realized, the high magnification of the steering group enables the objective group to select a relatively small focal length when the continuous magnification of 1-6 times is realized, meanwhile, the positive refractive power magnification structure enables the sighting telescope to be compact in integral structure, and reasonable distribution of refractive power enables all magnifications of the optical system and high image quality under a view field.
Drawings
In order to more clearly illustrate the embodiments of the invention 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, it being obvious that the drawings in the following description are only some embodiments of the invention, 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 a high zoom ratio telescope optical system according to the present invention at 1X zoom;
FIG. 2 is a schematic diagram of a distortion field curve of the high zoom ratio telescope optical system provided by the invention under 1X zoom;
FIG. 3 is a schematic diagram of a transfer function curve of the high zoom ratio telescope optical system provided by the invention under 1X zoom;
FIG. 4 is a graph of lateral aberrations of the high zoom ratio telescope optical system provided by the present invention for a 0 field, a 0.3 field, and a 0.5 field at 1X zoom;
FIG. 5 is a graph of lateral aberrations of the high zoom ratio telescope optical system provided by the present invention for 0.7 field, 0.85 field, and 1.0 field at 1X zoom;
FIG. 6 is a schematic diagram of the structure of the high zoom ratio telescope optical system provided by the invention under 6X zoom;
FIG. 7 is a schematic diagram of a distortion field curve of the high zoom ratio telescope optical system provided by the invention under 6X zoom;
FIG. 8 is a schematic diagram of a transfer function curve of the high zoom ratio telescope optical system provided by the invention under 6X zoom;
FIG. 9 is a graph of lateral aberrations of the high zoom ratio telescope optical system provided by the present invention for a 0 field, a 0.3 field, and a 0.5 field at 6 Xzoom;
Fig. 10 is a graph of lateral aberrations of 0.7 field, 0.85 field, and 1.0 field of the high zoom ratio scope optical system provided by the invention at 6X zoom.
Reference numerals illustrate: 1. an objective lens group; 11. a first lens; 12. a second lens; 13. a third lens; 14. a fourth lens; 2. a steering group; 21. a field lens; 22. a fifth lens; 23. a sixth lens; 24. a seventh lens; 25. an eighth lens; 26. a ninth lens; 27. a tenth lens; 28. a first glass plate; 29. a second glass plate; 3. an eyepiece group; 31. an eleventh lens; 32. a twelfth lens; 33. and a thirteenth lens.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.
The invention provides a high-zoom-ratio sighting telescope optical system, as shown in fig. 1 and 6, which comprises a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a field lens 21, a fifth lens 22, a sixth lens 23, a seventh lens 24, an eighth lens 25, a ninth lens 26, a tenth lens 27, a first glass plate 28, a second glass plate 29, an eleventh lens 31, a twelfth lens 32 and a thirteenth lens 33, wherein the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 are sequentially arranged from an object side to an image side along an optical axis, and the objective lens group 1 is composed of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 which are sequentially arranged from the object side to the image side along the optical axis; the turning group 2 is composed of a field lens 21, a fifth lens 22, a sixth lens 23, a seventh lens 24, an eighth lens 25, a ninth lens 26, a tenth lens 27, a first glass plate 28, and a second glass plate 29, which are disposed in this order from the object side to the image side along the optical axis; the eyepiece group 3 is constituted by an eleventh lens 31, a twelfth lens 32, and a thirteenth lens 33, which are disposed in order from the object side to the image side along the optical axis.
The objective lens group 1 includes four lens elements with refractive power, in order from an object side to an image side along an optical axis:
the first lens element 11 with positive refractive power, wherein an object-side paraxial region of the first lens element 11 is convex and an image-side paraxial region of the first lens element 11 is convex;
a second lens element 12 with negative refractive power having a concave object-side paraxial region of the second lens element 12 and a convex image-side paraxial region of the second lens element 12;
the third lens element 13 with positive refractive power, wherein an object-side paraxial region of the third lens element 13 is convex and an image-side paraxial region of the third lens element 13 is concave;
The fourth lens element 14 with positive refractive power has a convex object-side paraxial region of the fourth lens element 14 and a concave image-side paraxial region of the fourth lens element 14;
The first lens element 11 with positive refractive power and the second lens element 12 with negative refractive power can be used for correcting an on-axis spherical aberration of an optical system, and the object-side surface and the image-side surface of the second lens element 12 are respectively concave and convex at a paraxial region thereof, so that the image-side surface of the first lens element 11 and the object-side surface of the second lens element 12 are bonded together to form a first bonding lens element, and when light enters the third lens element 13 with positive refractive power, due to the convex design of the object-side surface and the image-side surface of the third lens element 13 at the paraxial region thereof, the light collected by the first lens element 11 and the second lens element 12 can be compressed, so that the incident light is smoothly transited, the relative illuminance of the high-power collimating lens optical system is improved, and the central and marginal field-of-view light can be effectively converged, so that the astigmatism of the optical system can be corrected.
Six lenses with refractive power in the steering group 2 sequentially comprise, from an object side to an image side along an optical axis:
A field lens 21 with positive refractive power, wherein an object-side paraxial region of the field lens 21 is convex, and an image-side paraxial region of the field lens 21 is convex;
a fifth lens element 22 with negative refractive power having a convex object-side paraxial region of the fifth lens element 22 and a concave image-side paraxial region of the fifth lens element 22;
a sixth lens element 23 with positive refractive power, wherein an object-side paraxial region of the sixth lens element 23 is convex and an image-side paraxial region of the sixth lens element 23 is convex;
A seventh lens element 24 with negative refractive power having a convex object-side paraxial region of the seventh lens element 24 and a concave image-side paraxial region of the seventh lens element 24;
an eighth lens element 25 with positive refractive power, wherein the object-side surface of the eighth lens element 25 is convex at the paraxial region thereof, and the image-side surface of the eighth lens element 25 is convex at the paraxial region thereof;
A ninth lens element 26 with negative refractive power having a concave object-side paraxial region and a convex image-side paraxial region of the ninth lens element 26;
A tenth lens element 27 with negative refractive power, wherein an object-side paraxial region of the tenth lens element 27 is concave, and an image-side paraxial region of the tenth lens element 27 is concave; and
A first glass plate 28 and a second glass plate 29.
The fifth lens element 22 with negative refractive power is beneficial to converging the marginal field of view light, so that the converged light can smoothly enter the rear-end optical system. The sixth lens element 23 with positive refractive power is beneficial to converging light and reducing the light deflection angle, so as to make the light trend transition smoothly. The seventh lens element 24 with negative refractive power is beneficial to converging the marginal field of view light, so that the converged light smoothly enters the rear-end optical system. The eighth lens element 25 with positive refractive power is beneficial to suppressing the angle of incidence of the marginal field of view on the imaging surface, so as to effectively transmit more light beams to the imaging surface and improve the imaging quality of the optical system. The eighth lens element 25 can have a concave-convex shape, which is beneficial to improving the relative illumination of the marginal field of view, avoiding the generation of dark corners and improving the imaging quality of the optical system. The ninth lens element 26 with negative refractive power is beneficial to increasing the imaging area of the optical system, and balancing various aberrations generated by the eighth lens element 25 to improve the imaging quality of the optical system. The tenth lens element 27 with negative refractive power has a concave-concave shape, which is beneficial to smooth light beam traveling and to correct astigmatism, field curvature and other aberrations.
The distance between the field lens 21 and the second cemented lens, the distance between the second cemented lens and the third cemented lens and the distance between the third cemented lens and the fourth cemented lens are adjusted to realize continuous magnification with the magnification ratio of 6 times and higher vertical axis magnification in the high-magnification sighting telescope optical system, the high magnification of the steering group 2 enables the objective group 1 to select a relatively smaller focal length when realizing continuous magnification of 1-6 times, and meanwhile, the positive refractive power magnification structure enables the sighting telescope to be compact in overall structure, and reasonable distribution of refractive powers enables all magnifications of the optical system and higher image quality under the view field.
Three lenses having refractive power in total in the eyepiece lens group 3 sequentially include, from an object side to an image side:
an eleventh lens element 31 with negative refractive power having a concave object-side paraxial region of the eleventh lens element 31 and a concave image-side paraxial region of the eleventh lens element 31;
A twelfth lens element 32 with positive refractive power having a convex object-side paraxial region of the twelfth lens element 32 and a convex image-side paraxial region of the twelfth lens element 32;
A thirteenth lens element 33 with positive refractive power, wherein the object-side surface of the thirteenth lens element 33 is convex at the paraxial region thereof, and the image-side surface of the thirteenth lens element 33 is convex at the paraxial region thereof;
The eleventh lens element 31 with negative refractive power is beneficial to increasing the imaging area of the optical system, balancing various aberrations generated by the sixth lens element 23, improving the imaging quality of the optical system, stabilizing the light trend, and facilitating the correction of astigmatism, field curvature and other aberrations; the twelfth lens element 32 with positive refractive power can reduce the light deflection angle while converging light rays, so as to smoothly transition the light rays. The twelfth lens 32 may have a biconvex shape, which may further reduce the working aperture of the twelfth lens 32, thereby facilitating miniaturization of the rear-end volume of the optical system; the thirteenth lens element 33 with positive refractive power is beneficial to converging light and reducing the light deflection angle, so as to make the light trend transition smoothly. The thirteenth lens 33 may have a biconvex shape, and the working aperture of the thirteenth lens 33 may be further reduced, thereby facilitating miniaturization of the rear-end volume of the optical system.
In the present embodiment, the first lens 11 and the second lens 12 form a first cemented lens, the fifth lens 22 and the sixth lens 23 form a second cemented lens, the seventh lens 24 and the eighth lens 25 form a third cemented lens, the ninth lens 26 and the tenth lens 27 form a fourth cemented lens, and the eleventh lens 31 and the twelfth lens 32 form a fifth cemented lens. The chromatic aberration of the optical system can be effectively corrected, the decentration sensitivity of the optical system can be reduced, the chromatic aberration of the optical system can be balanced, and the imaging quality of the optical system can be improved; the assembly sensitivity of the optical system can be reduced, the processing technology difficulty of the optical system is further reduced, and the assembly yield of the optical system is improved.
In this embodiment, the focal lengths of each group in the optical system of the high-zoom-ratio telescope respectively satisfy:
43.75＜F1＜45.23
8.17＜F2＜460.27
42.13＜F3＜46.39
0.94≤F1/F3≤1.07
Where F 1 denotes the focal length of the objective lens group 1, F 2 denotes the focal length of the steering group 2, and F 3 denotes the focal length of the eyepiece group 3.
In this embodiment, the high-zoom-ratio scope optical system also satisfies:
3.22≤T1≤53.69
7.06≤T2≤14.65
7.36≤T3≤50.23
Wherein T 1 denotes a variable pitch between the field lens 21 and the second cemented lens, T 2 denotes a variable pitch between the second cemented lens and the third cemented lens, and T 3 denotes a variable pitch between the third cemented lens and the fourth cemented lens.
In the present embodiment, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 22, the sixth lens 23, the seventh lens 24, the eighth lens 25, the ninth lens 26, the tenth lens 27, the eleventh lens 31, the twelfth lens 32, and the thirteenth lens 33 are spherical lenses.
In this embodiment, the optical total length of the high-zoom-ratio scope optical system satisfies:
232.91<TTL<236.53
wherein, TTL represents the total optical length of the high-zoom-ratio sighting telescope optical system.
As shown in fig. 1, the optical path structure of the high-zoom-ratio scope optical system at 1X magnification is shown.
In this embodiment, the total length of the optical system and the effective focal length of the optical system satisfy the following conditions when the high-zoom-ratio scope optical system is zoomed 1 time:
4.93≤TTL/Fa1≤5.90
Wherein, TTL represents the optical total length of the high-zoom-ratio sighting telescope optical system, and F a1 represents the effective focal length of the high-zoom-ratio sighting telescope optical system under 1-time zooming.
In this embodiment, the ratio of the effective focal length of the optical system to the entrance pupil aperture of the optical system satisfies the following condition under 1-fold zooming of the high-zoom-ratio scope optical system:
4.33≤Fa1/D1≤5.37
Wherein f a1 represents the effective focal length of the high-zoom-ratio telescope optical system under 1-time zoom, and D 1 represents the entrance pupil aperture of the high-zoom-ratio telescope optical system under 1-time zoom.
As shown in fig. 2, the left side of fig. 2 is a field curvature diagram of the high zoom ratio scope optical system at 1X zoom, and the right side is a distortion diagram of the high zoom ratio scope optical system at 1X zoom. The distortion of the optical system in the distortion chart is less than 5%, and the imaging quality is less affected.
Fig. 3 is a graph showing a transfer function curve of a high zoom ratio scope optical system at 1X zoom, wherein the graph shows a lens imaging modulation degree of different spatial frequencies under each view field, the horizontal axis shows the spatial frequency (unit: lp/mm), and the vertical axis shows an MTF value.
Referring to fig. 4 and 5, there are lateral aberration diagrams of the high zoom ratio scope optical system at 0 field, 0.3 field, 0.5 field, 0.7 field, 0.85 field and 1.0 field under 1X zoom, and the wavelength range is 0.48-0.65 nm. As can be seen from the figure, the high zoom ratio sighting telescope optical system under 1X zoom has sufficiently corrected lateral aberration in the entire field of view, and also has good correction of vertical axis chromatic aberration and excellent imaging performance, indicating that the optical system has ensured excellent imaging performance while obtaining a wide field of view.
As shown in fig. 6, the optical path structure of the high-zoom-ratio scope optical system at 6X magnification is shown.
In this embodiment, the total length of the optical system and the effective focal length of the optical system satisfy the following conditions when the high-zoom-ratio scope optical system zooms 6 times:
0.54≤TTL/Fa2≤1.17
Wherein, TTL represents the optical total length of the high-zoom-ratio sighting telescope optical system, and F a2 represents the effective focal length of the high-zoom-ratio sighting telescope optical system under 6 times of zooming.
In this embodiment, the ratio of the effective focal length of the optical system to the entrance pupil aperture of the optical system satisfies the following condition under 6-fold zooming of the high-zoom-ratio scope optical system:
11.08≤Fa2/D2≤12.12
Wherein F a2 represents the effective focal length of the high-zoom-ratio sighting telescope optical system under 6 times of zooming, and D 2 represents the entrance pupil caliber of the high-zoom-ratio sighting telescope optical system under 6 times of zooming.
As shown in fig. 7, the left side of fig. 7 is a field curvature diagram of the high zoom ratio scope optical system at 6X zoom, and the right side is a distortion diagram of the high zoom ratio scope optical system at 6X zoom. The distortion of the optical system in the distortion chart is less than 1%, and the imaging quality is less affected.
Fig. 8 is a graph showing a transfer function curve of a high zoom ratio scope optical system at 6X zoom, wherein the graph shows a lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis shows a spatial frequency (unit: lp/mm), and the vertical axis shows an MTF value.
Referring to fig. 9 and 10, there are lateral aberration diagrams of the high zoom ratio scope optical system at 0 field, 0.3 field, 0.5 field, 0.7 field, 0.85 field and 1.0 field under 6X zoom, and the wavelength range is 0.48-0.65 nm. As can be seen from the figure, the high zoom ratio sighting telescope optical system under 6X zoom has sufficiently corrected lateral aberration in the entire field of view, and also has good correction of vertical axis chromatic aberration and excellent imaging performance, indicating that the optical system has ensured excellent imaging performance while obtaining a wide field of view.
In an embodiment of the invention, the individual lens specific parameters are shown in table 1. Table 1 shows the radius of curvature R, thickness T, and lens material of each lens of the high-zoom-ratio scope optical system, wherein the radius of curvature R and thickness T are each in millimeters (mm).
TABLE 1
The lens surface corresponding to the surface number 1 corresponds to the object side surface of the first lens 11, the lens surface corresponding to the surface number 2 corresponds to the joint surface of the first lens 11 and the second lens 12, the lens surface corresponding to the surface number 3 corresponds to the image side surface of the second lens 12, the lens surface corresponding to the surface number 4 corresponds to the object side surface of the third lens 13, the lens surface corresponding to the surface number 5 corresponds to the image side surface of the third lens 13, the lens surface corresponding to the surface number 6 corresponds to the object side surface of the fourth lens 14, the lens surface corresponding to the surface number 7 corresponds to the object side surface of the fourth lens 14, the lens surface corresponding to the surface number 9 and the lens surface corresponding to the surface number 10 correspond to the object side surface and the image side surface of the field lens 21, the lens surface corresponding to the surface number 11 corresponds to the object side surface of the fifth lens 22, the lens surface corresponding to the surface of the surface number 12 corresponds to the joint surface of the fifth lens 22 and the sixth lens 23, the lens surface corresponding to the surface number 13 corresponds to the image side surface of the sixth lens 23, the lens surface corresponding to the surface No. 14 is the object side surface of the seventh lens 24, the lens surface corresponding to the surface No. 15 is the joint surface of the seventh lens 24 and the eighth lens 25, the lens surface corresponding to the surface No. 16 is the image side surface of the eighth lens 25, the lens surface corresponding to the surface No. 17 is the object side surface of the ninth lens 26, the lens surface corresponding to the surface No. 18 is the joint surface of the ninth lens 26 and the tenth lens 27, the lens surface corresponding to the surface No. 19 is the image side surface of the tenth lens 27, the lens surface corresponding to the surface No. 24 is the object side surface of the eleventh lens 31, the lens surface corresponding to the surface No. 25 is the joint surface of the eleventh lens 31 and the twelfth lens 32, the lens surface corresponding to the surface No. 26 is the image side surface of the twelfth lens 32, and the lens surface corresponding to the surface No. 27 and the lens surface corresponding to the surface No. 28 are the object side surface and the image side surface of the thirteenth lens 33, respectively.
The overall parameters of the high-zoom-ratio scope optics matched to table 1 are as follows:
The focal length of the objective lens group 1 is 44mm;
the focal length of the eyepiece group 3 is 44.3996mm;
The focal length of the field lens 21 in the steering group 2 is 28.059mm, the focal length of the second cemented lens is 36.502mm, the focal length of the third cemented lens is 36.499mm, and the focal length of the fourth cemented lens is-40.192 mm;
the distance between the third cemented lens and the first glass plate 28 is 17.77mm;
the total optical length of the high-zoom-ratio sighting telescope optical system is 234.935mm.
Under the condition that the high zoom ratio sighting telescope optical system is in a 1X zoom state:
the variable spacing between the field lens 21 and the second cemented lens is T 1 = 53.6861mm;
The variable spacing between the second and third cemented lenses is T 2 = 7.0561mm;
the variable spacing between the third and fourth cemented lenses is T 3 = 7.3578mm;
The ratio of the total length of the optical system to the effective focal length of the optical system is TTL/F a1 =5.40 mm;
the ratio of the effective focal length of the optical system to the entrance pupil aperture of the optical system is F a1/D1 =4.83 mm;
under the condition that the high zoom ratio sighting telescope optical system is in a 6X zoom state:
the variable spacing between the field lens 21 and the second cemented lens is T 1 = 3.217mm;
the variable spacing between the second and third cemented lenses is T 2 = 14.6492mm;
The variable spacing between the third and fourth cemented lenses is T 3 = 50.2337mm;
the ratio of the total length of the optical system to the effective focal length of the optical system is TTL/F a1 =0.87 mm;
The ratio of the effective focal length of the optical system to the entrance pupil aperture of the optical system is F a1/D1 =11.62 mm.
In one example, the high-zoom-ratio telescope optical system can also be adjusted to 2X zoom, 3X zoom, 4X zoom and 5X zoom, wherein the effective focal length of the high-zoom-ratio telescope optical system at 2X zoom is 88.7999mm and the entrance pupil aperture is 15.4mm; the effective focal length of the high zoom ratio sighting telescope optical system is 133.201mm during 3X zooming, and the aperture of an entrance pupil is 23.2mm; the effective focal length of the high zoom ratio sighting telescope optical system is 177.597mm during 4X zooming, and the aperture of an entrance pupil is 23.2mm; the effective focal length of the high zoom ratio sighting telescope optical system during 5X zooming is 222.0065mm, and the entrance pupil caliber is 23.2mm.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. The high-zoom-ratio sighting telescope optical system is characterized by comprising an objective lens group (1), a steering group (2) and an eyepiece group (3) which are sequentially arranged from an object side to an image side along an optical axis,
The objective lens group (1) comprises a first lens (11) with positive refractive power, a second lens (12) with negative refractive power, a third lens (13) with positive refractive power and a fourth lens (14) with positive refractive power, wherein the first lens (11), the second lens (12), the third lens (13) and the fourth lens (14) are sequentially arranged from an object side to an image side along an optical axis;
The steering group (2) includes a field lens (21) having positive refractive power, a fifth lens (22) having negative refractive power, a sixth lens (23) having positive refractive power, a seventh lens (24) having negative refractive power, an eighth lens (25) having positive refractive power, a ninth lens (26) having negative refractive power, a tenth lens (27) having negative refractive power, a first glass plate (28), and a second glass plate (29), the field lens (21), the fifth lens (22), the sixth lens (23), the seventh lens (24), the eighth lens (25), the ninth lens (26), the tenth lens (27), the first glass plate (28), and the second glass plate (29) being disposed in order from an object side to an image side along an optical axis;
the eyepiece lens group (3) comprises an eleventh lens (31) with negative refractive power, a twelfth lens (32) with positive refractive power, and a thirteenth lens (33) with positive refractive power, wherein the eleventh lens (31), the twelfth lens (32) and the thirteenth lens (33) are sequentially arranged from an object side to an image side along an optical axis;
The Gao Bianbei-ratio scope optical system satisfies the following conditional expression:
43.75＜F1＜45.23；
8.17＜F2＜460.27；
42.13＜F3＜46.39；
0.94≤F1/F3≤1.07；
wherein F 1 denotes a focal length of the objective lens group (1), F 2 denotes a focal length of the steering group (2), and F 3 denotes a focal length of the eyepiece group (3).
2. The high-power collimating lens optical system of claim 1, wherein the object-side paraxial region of the first lens (11) is convex, the image-side paraxial region of the second lens (12) is concave, the image-side paraxial region of the fifth lens (22) is convex, the object-side paraxial region of the third lens (13) is convex, the image-side paraxial region of the third lens (13) is concave, the object-side paraxial region of the fourth lens (14) is convex, the image-side paraxial region of the fourth lens (14) is concave, the object-side paraxial region of the field lens (21) is convex, the image-side paraxial region of the fifth lens (22) is concave, the image-side convex, the image-side surface of the sixth lens (23) is convex, the image-side surface of the seventh lens (25) is concave, the image-side surface of the image-side lens (25) is the image-side paraxial region of the eighth lens (25), the image-side paraxial region of the seventh lens (25) is concave, the object-side paraxial region of the tenth lens element (27) is concave, the image-side paraxial region of the tenth lens element (27) is concave, the object-side paraxial region of the eleventh lens element (31) is concave, the image-side paraxial region of the eleventh lens element (31) is concave, the object-side paraxial region of the twelfth lens element (32) is convex, the image-side paraxial region of the twelfth lens element (32) is convex, the object-side paraxial region of the thirteenth lens element (33) is convex, and the image-side paraxial region of the thirteenth lens element (33) is convex.
3. The high-zoom-ratio telescope optical system according to claim 1, characterized in that the first lens (11) and the second lens (12) constitute a first cemented lens, the fifth lens (22) and the sixth lens (23) constitute a second cemented lens, the seventh lens (24) and the eighth lens (25) constitute a third cemented lens, the ninth lens (26) and the tenth lens (27) constitute a fourth cemented lens, and the eleventh lens (31) and the twelfth lens (32) constitute a fifth cemented lens.
4. The high zoom ratio scope optical system of claim 3, wherein the Gao Bianbei ratio scope optical system further satisfies:
3.22≤T1≤53.69
7.06≤T2≤14.65
7.36≤T3≤50.23
Wherein T 1 represents a variable pitch between the field lens (21) and the second cemented lens, T 2 represents a variable pitch between the second cemented lens and the third cemented lens, and T 3 represents a variable pitch between the third cemented lens and the fourth cemented lens.
5. The high zoom ratio scope optical system of claim 1, wherein the total optical length of the Gao Bianbei ratio scope optical system satisfies:
232.91<TTL<236.53
Wherein TTL represents the total optical length of the Gao Bianbei than the scope optical system.
6. The high zoom ratio scope optical system of claim 1, wherein the Gao Bianbei ratio scope optical system satisfies the following condition with respect to the total length of the optical system and the effective focal length of the optical system at 1-fold zoom:
4.93≤TTL/Fa1≤5.90
wherein TTL represents the total optical length of the Gao Bianbei-fold and F a1 represents the effective focal length of the Gao Bianbei-fold zoom lens system.
7. The high zoom ratio scope optical system of claim 1, wherein the Gao Bianbei ratio scope optical system satisfies the following condition with respect to the total length of the optical system and the effective focal length of the optical system at 6 times zoom:
0.54≤TTL/Fa2≤1.17
wherein TTL represents the total optical length of the Gao Bianbei-fold and F a2 represents the effective focal length of the Gao Bianbei-fold zoom lens system.
8. The high zoom ratio scope optical system of claim 1, wherein the ratio of the effective focal length of the optical system to the entrance pupil aperture of the optical system at 1 x zoom of the Gao Bianbei x scope optical system satisfies the following condition:
4.33≤Fa1/D1≤5.37
Wherein F a1 represents the effective focal length of the Gao Bianbei-to-scope optical system at 1-fold zoom, and D 1 represents the entrance pupil aperture of the Gao Bianbei-to-scope optical system at 1-fold zoom.
9. The high zoom ratio scope optical system of claim 1, wherein the ratio of the effective focal length of the optical system to the entrance pupil aperture of the optical system at 6 times zoom of the Gao Bianbei ratio scope optical system satisfies the following condition:
11.08≤Fa2/D2≤12.12
Wherein F a2 represents the effective focal length of the Gao Bianbei-to-scope optical system at 6-fold zoom, and D 2 represents the entrance pupil aperture of the Gao Bianbei-to-scope optical system at 6-fold zoom.
10. The high-zoom-ratio scope optical system according to claim 1, wherein the first lens (11), the second lens (12), the third lens (13), the fourth lens (14), the fifth lens (22), the sixth lens (23), the seventh lens (24), the eighth lens (25), the ninth lens (26), the tenth lens (27), the eleventh lens (31), the twelfth lens (32), and the thirteenth lens (33) are spherical lenses.
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| CN101614506A (en) * | 2009-07-17 | 2009-12-30 | 南通蓬盛机械有限公司 | Sighting device |
| CN203616527U (en) * | 2013-12-12 | 2014-05-28 | 山东亿能光学仪器股份有限公司 | Large-caliber long-distance of exit pupil high-power telescopic sight |
| JP2014153400A (en) * | 2013-02-05 | 2014-08-25 | Olympus Imaging Corp | Zoom lens |
| WO2019097719A1 (en) * | 2017-11-20 | 2019-05-23 | 株式会社ニコン | Variable magnification optical system, optical device, and manufacturing method of variable magnification optical system |
| CN111527437A (en) * | 2017-11-20 | 2020-08-11 | 株式会社尼康 | Variable magnification optical system, optical device, and method for manufacturing variable magnification optical system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5549462B2 (en) * | 2009-08-04 | 2014-07-16 | コニカミノルタ株式会社 | OPTICAL SYSTEM, IMAGE PROJECTION DEVICE AND IMAGING DEVICE EQUIPPED |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614506A (en) * | 2009-07-17 | 2009-12-30 | 南通蓬盛机械有限公司 | Sighting device |
| JP2014153400A (en) * | 2013-02-05 | 2014-08-25 | Olympus Imaging Corp | Zoom lens |
| CN203616527U (en) * | 2013-12-12 | 2014-05-28 | 山东亿能光学仪器股份有限公司 | Large-caliber long-distance of exit pupil high-power telescopic sight |
| WO2019097719A1 (en) * | 2017-11-20 | 2019-05-23 | 株式会社ニコン | Variable magnification optical system, optical device, and manufacturing method of variable magnification optical system |
| CN111527437A (en) * | 2017-11-20 | 2020-08-11 | 株式会社尼康 | Variable magnification optical system, optical device, and method for manufacturing variable magnification optical system |
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