CN218037516U - Optical lens system - Google Patents

Abstract

The utility model discloses an optical lens system, be used for collocating with big face array infrared detector, optical lens system includes a plurality of mirror groups, a plurality of mirror groups include along the optical axis direction from the thing side to the image side telescope system lens group that sets gradually, the scanning galvanometer, cubic imaging lens group, optical window, aperture diaphragm and image plane, aperture diaphragm is used for cold diaphragm looks adaptation in the infrared detector that matches with optical lens system, the entrance pupil position of cubic imaging lens group and the exit pupil position coincidence of telescope system lens group, and all be located scanning galvanometer department, so that form even background from the formation of image on the image plane of the light beam of thing side incidence; wherein the operating wavelength band of the optical lens system is set to 3.7 to 4.8 μm, the range of the magnification ratio Γ of the optical lens system is set to 1 < Γ ≦ 20, and the F-number of the optical lens system is set to 2 ≦ F ≦ 5.5. The problem that the conventional optical lens system does not have the large-area array and large-magnification continuous variable-magnification area array scanning function is solved.

Description

Optical lens system

Technical Field

The utility model relates to the field of optical technology, especially, relate to optical lens system.

Background

The infrared search tracking system is a passive detection system, can perform scanning search in a range of 360 degrees in azimuth, provides azimuth pitching position information of a target after the target is found, performs continuous high-frame-frequency tracking on the target, has the advantages of all-weather work, high sensitivity, long detection distance and the like, and has wide application prospects in the fields of national defense, safety and the like. The traditional infrared search tracking system realizes all-dimensional scanning imaging based on the push-broom motion of a linear detector, but the integration time of the traditional infrared search tracking system is limited by the scanning rate, and the time spent on each pixel is usually in the order of tens of microseconds, so that the output signal intensity is low, and the signal-to-noise ratio is high.

The currently reported infrared area array scanning optical systems do not have the large-area array and large-magnification continuous variable-magnification area array scanning function. In practical application, when 360-degree cycle scanning search and gaze tracking are carried out, the change of the resolution ratio of the target is limited, and particularly, the continuous tracking function of a long-distance target has certain limitation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an optical lens system aims at solving the problem that current optical lens system does not possess big area array, the continuous variable power area array of big multiplying power and scans the function.

To achieve the above object, the present invention provides an optical lens system, wherein the optical lens system includes:

an optical lens system is used for being matched with a large-area array infrared detector and is characterized by comprising a plurality of lens groups, wherein the lens groups comprise a telescopic system lens group, a scanning galvanometer, a tertiary imaging lens group, an optical window, an aperture diaphragm and an image surface which are sequentially arranged from an object side to an image side along an optical axis direction, the aperture diaphragm is used for being matched with a cold diaphragm in the infrared detector matched with the optical lens system, and the entrance pupil position of the tertiary imaging lens group is superposed with the exit pupil position of the telescopic system lens group and is positioned at the scanning galvanometer, so that light beams incident from the object side form a uniform background in an imaging mode on the image surface;

wherein an operating wavelength band of the optical lens system is set to 3.7 to 4.8 μm, a range of a magnification ratio Γ of the optical lens system is set to 1 < Γ ≦ 20, and an F-number of the optical lens system is set to 2 ≦ F ≦ 5.5.

Optionally, the telescopic system lens group includes a front fixed lens group, a zoom lens group, a compensation lens group, a rear fixed lens group, and a secondary imaging lens group, wherein at least one of the zoom lens group and the compensation lens group is movably disposed along an extending direction of the optical axis.

Optionally, the front fixed lens group comprises a first lens and a second lens; and/or the presence of a gas in the gas,

the zoom lens group comprises a third lens which is movably arranged along the extending direction of the optical axis; and/or the presence of a gas in the gas,

the compensation lens group comprises a fourth lens and a fifth lens, and the fourth lens and the fifth lens are movably arranged along the extending direction of the optical axis; and/or the presence of a gas in the gas,

the rear fixed lens group comprises a sixth lens; and/or the presence of a gas in the gas,

the secondary imaging lens group includes a seventh lens and an eighth lens.

Optionally, the first lens is a meniscus silicon lens, a concave surface of the first lens is disposed toward the image side, the second lens is a meniscus germanium lens, and a concave surface of the second lens is disposed toward the image side; and/or the presence of a gas in the atmosphere,

the third lens is a biconcave spherical silicon lens; and/or the presence of a gas in the gas,

the fourth lens is a biconvex aspheric silicon lens, the fifth lens is a meniscus aspheric germanium lens, and the concave surface of the fifth lens faces the object side; and/or the presence of a gas in the gas,

the sixth lens is a meniscus aspheric silicon lens, and the concave surface of the sixth lens faces the object side; and/or the presence of a gas in the atmosphere,

the seventh lens is a spherical silicon lens, the concave surface of the seventh lens faces the scanning galvanometer, the eighth lens is an aspheric germanium lens, and the concave surface of the eighth lens faces the scanning galvanometer.

Optionally, the focal power of the first lens is positive, and the focal power of the second lens is negative; and/or the presence of a gas in the atmosphere,

the focal power of the third lens is negative; and/or the presence of a gas in the gas,

the focal power of the fourth lens is positive, and the focal power of the fifth lens is negative;

the focal power of the sixth lens is positive; and/or the presence of a gas in the gas,

the focal power of the seventh lens is negative, and the focal power of the eighth lens is positive.

Optionally, an entrance pupil position of the optical lens system is located on a surface of the first lens facing the object side.

Optionally, the secondary imaging lens group comprises a seventh lens and an eighth lens; and/or the presence of a gas in the gas,

the third imaging lens group comprises a ninth lens, a tenth lens, an eleventh lens and a twelfth lens, and the ninth lens is movably arranged along the extending direction of the optical axis.

Optionally, the ninth lens element is a meniscus spherical silicon lens, a concave surface of the ninth lens element faces the image side, the tenth lens element is a meniscus aspherical silicon lens, a concave surface of the tenth lens element faces the scanning galvanometer, the eleventh lens element is a biconvex aspherical silicon lens, the twelfth lens element is a meniscus spherical germanium lens, and a concave surface of the twelfth lens element faces the image side.

Optionally, the focal power of the ninth lens is positive, the focal power of the tenth lens is positive, the focal power of the eleventh lens is positive, and the focal power of the twelfth lens is negative.

Optionally, the optical lens system further includes a turning mirror, and the turning mirror is disposed between the telescope system lens group and the secondary imaging lens group;

the turning reflector and the scanning galvanometer are arranged correspondingly, so that after the light beam incident from the object side is transmitted by the secondary imaging lens group, the turning reflector reflects the light beam to the scanning galvanometer, and the scanning galvanometer reflects the light beam to the tertiary imaging lens group, so that the light beam emitted by the tertiary imaging lens group is parallel to and opposite to the propagation path of the light beam incident from the object side.

The utility model provides an among the technical scheme, optical lens system includes telescope system lens group, scanning galvanometer, cubic formation of image battery, optical window, aperture diaphragm and image plane, turns into parallel light beam through telescope system lens group with the light of inciding, and throw to the scanning galvanometer, the scanning galvanometer is turned over to the light path, the scanning galvanometer has fixed state and round trip retrace state, so that optical lens system has gazing tracking mode and week and sweep the search mode under the gazing tracking mode, telescope system lens group realizes zooming in succession under week sweeps the search mode, makes image plane formation of image does not have defocusing to cooperate large-area array infrared detector (1280 refrigeration 1024 type infrared detector) collocation, realize optical lens system's working wave section is 3.7 ~ 4.8 mu m, optical lens system's range of variation ratio gamma is 1 < gamma is less than or equal to 20, optical lens system's F number is 2 and is less than or equal to 5.5 to solve present optical lens system and do not possess the problem of the magnification of continuous variation of large-area array, large-area array function.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a telephoto system corresponding to an optical lens system provided by the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of the short focus system corresponding to the optical lens system in FIG. 1;

FIG. 3 is a corresponding transfer function curve diagram of the short-focus system in FIG. 2 when the included angle of the f60mm galvanometer is 45 °;

FIG. 4 is a graph of a transfer function corresponding to the short focus system of FIG. 2 with an f60mm galvanometer included angle of 44.56;

FIG. 5 is a graph of a corresponding transfer function curve of the short focus system of FIG. 2 with an f60mm galvanometer included angle of 45.44;

FIG. 6 is a graph of distortion for the short focus system of FIG. 2 at f60 mm;

FIG. 7 is a graph of a transfer function corresponding to the tele system of FIG. 1 with an included angle of the f600mm galvanometer of 45;

FIG. 8 is a graph of a corresponding transfer function for the tele system of FIG. 1 with an f600mm galvanometer included angle of 44.56;

FIG. 9 is a graph of a corresponding transfer function curve of the tele system of FIG. 1 with an f600mm galvanometer included angle of 45.44;

fig. 10 is a distortion plot for the tele system of fig. 1 at 600 mm.

The reference numbers indicate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B", including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The infrared search tracking system is a passive detection system, can perform scanning search in a range of 360 degrees in azimuth, provides azimuth pitching position information of a target after the target is found, performs continuous high-frame-frequency tracking on the target, has the advantages of all-weather work, high sensitivity, long detection distance and the like, and has wide application prospects in the fields of national defense, safety and the like. The traditional infrared search tracking system realizes all-dimensional scanning imaging based on the push-broom motion of a linear detector, but the integration time of the traditional infrared search tracking system is limited by the scanning rate, and the time spent on each pixel is usually in the order of tens of microseconds, so that the output signal intensity is low, and the signal-to-noise ratio is high. The currently reported infrared area array scanning optical systems do not have the large-area array and large-magnification continuous variable-magnification area array scanning function. In practical application, when 360-degree cycle scanning search and gaze tracking are carried out, the change of the resolution ratio of the target is limited, and particularly, the continuous tracking function of a long-distance target has certain limitation.

In order to solve the above problem, the utility model provides an optical lens system 1000 for with big area array infrared detector collocation, fig. 1 to fig. 3 are the utility model provides an optical lens system 1000's specific embodiment.

Referring to fig. 1 to 3, the optical lens system 1000 includes a plurality of lens groups, the lens groups include a telescopic lens group 100, a scanning galvanometer 200, a tertiary imaging lens group 300, an optical window 400, an aperture stop 500 and an image plane 600, which are sequentially disposed from an object side to an image side along an optical axis direction, the aperture stop 500 is adapted to an cold stop in an infrared detector matched with the optical lens system 1000, an entrance pupil position of the tertiary imaging lens group 300 coincides with an exit pupil position of the telescopic lens group 100, and the three imaging lens groups are all located at the scanning galvanometer 200, so that an image of a light beam incident from the object side on the image plane 600 forms a uniform background; wherein an operating wavelength band of the optical lens system 1000 is set to 3.7 to 4.8 μm, a range of a magnification ratio Γ of the optical lens system 1000 is set to 1 < Γ ≦ 20, and an F-number of the optical lens system 1000 is set to 2 ≦ F ≦ 5.5.

The utility model provides an among the technical scheme, optical lens system 1000 includes telescope system lens group 100, scanning galvanometer 200, cubic formation of image lens group 300, optical window 400, aperture stop 500 and image plane 600, turns into parallel light beam through telescope system lens group 100 with the light of incidenting, and throws to scan galvanometer 200, scanning galvanometer 200 is turned over to the light path, scanning galvanometer 200 has fixed state and round trip retrace state, so that optical lens system 1000 has gaze tracking mode and week sweep search mode under the gaze tracking mode, telescope system lens group 100 realizes continuous zooming under week sweep search mode, make image plane 600 formation of image does not have defocusing to cooperate large area array infrared detector (1280 refrigeration type infrared detector) to realize optical lens system 1000's working wave band is 3.7 ~ 4.8 mu m, the range of the variable magnification ratio gamma of optical lens system 1000 is 1 < gamma and is not more than 20, optical lens system 1000's F number is 2 and is not more than 5.5, does not possess the continuous scanning gamma function problem of big area array with solving.

Specifically, in the present embodiment, the telephoto system lens group 100 includes a front fixed lens group 101, a variable power lens group 102, a compensation lens group 103, a rear fixed lens group 104, and a secondary imaging lens group 105, wherein at least one of the variable power lens group 102 and the compensation lens group 103 is movably disposed along an extending direction of the optical axis. A telescopic system is generally a telescope system, and a telescopic system (telesystematic system) is an optical imaging system that can magnify a viewing angle of a distant object. The incident parallel light beam is still a parallel light beam after passing through the telescope system. Specifically, when the variable power lens group 102 moves toward the object side, the compensation lens group 103 moves toward the image side to shorten the focal length of the light transmitted by the front fixed lens group 101, and when the variable power lens group 102 moves toward the image side, the compensation lens group 103 moves toward the object side to lengthen the focal length of the light transmitted by the front fixed lens group 101, and then the light beams are emitted in parallel through the rear fixed lens group 104 and the secondary imaging lens group 105.

Specifically, in the present embodiment, the front fixed lens group 101 includes a first lens 1 and a second lens 2; the variable power lens group 102 includes a third lens 3, and the third lens 3 is movably disposed along the extending direction of the optical axis; the compensation lens group 103 comprises a fourth lens 4 and a fifth lens 5, and the fourth lens 4 and the fifth lens 5 are movably arranged along the extending direction of the optical axis; the rear fixed lens group 104 includes a sixth lens 6; the secondary imaging lens group 105 includes a seventh lens 7 and an eighth lens 8. Through setting up first lens 1 with the light of different incident angles is assembled to second lens 2, follows through the setting the extending direction movably of optical axis sets up third lens 3 fourth lens 4 with fifth lens 5 realizes continuous zooming, the phase difference that a plurality of preceding lenses of sixth lens 6 can balance is formed, through setting up seventh lens 7 with eighth lens 8 will be followed the light that sixth lens 6 throws forms parallel light after refracting, throws to scanning galvanometer 200.

Specifically, in this embodiment, the first lens 1 is a meniscus silicon lens, the concave surface of the first lens 1 is disposed toward the image side, the second lens 2 is a meniscus germanium lens, and the concave surface of the second lens 2 is disposed toward the image side; the third lens 3 is a biconcave spherical silicon lens; the fourth lens 4 is a biconvex aspheric silicon lens, the fifth lens 5 is a meniscus aspheric germanium lens, and the concave surface of the fifth lens 5 faces the object side; the sixth lens 6 is a meniscus aspheric silicon lens, and a concave surface of the sixth lens 6 is disposed toward the object side; the seventh lens 7 is a spherical silicon lens, a concave surface of the seventh lens 7 faces the scanning galvanometer 200, the eighth lens 8 is an aspheric germanium lens, and a concave surface of the eighth lens 8 faces the scanning galvanometer 200. Germanium can be used for radiation detectors and thermoelectric materials, and because high-purity germanium single crystals have high refractive index, the germanium single crystals are transparent to infrared rays, do not transmit visible light and ultraviolet rays, and can be used as germanium windows, prisms or lenses specially transmitting infrared light. And the use of the meniscus lens can focus small light spots or collimate the light spot, and can reduce the spherical aberration, and the index of germanium is 4.0 in the higher index material such as germanium, so that the spherical aberration can be better and greatly reduced. The biconcave spherical lens can reduce imaging and diverging light beams, and the biconvex aspheric lens can converge the light path diverged from the focus back to the focus as much as possible. The reflection of the spherical lens follows the reflection law of light, light is converged or diverged, and the spherical lens can correct spherical aberration.

Further, in the present embodiment, the power of the first lens 1 is positive, and the power of the second lens 2 is negative; and/or the focal power of the third lens 3 is negative; and/or the focal power of the fourth lens 4 is positive, and the focal power of the fifth lens 5 is negative; the focal power of the sixth lens 6 is positive; and/or the focal power of the seventh lens 7 is negative, and the focal power of the eighth lens 8 is positive. By the arrangement, the focal power of the lens is reasonably distributed, the shape and the material collocation of the glass are adjusted, the chromatic aberration and the secondary spectrum are effectively reduced, the spherical aberration, the coma aberration, the astigmatism and the like on each lens are compensated and offset, and the effect of clear imaging is achieved.

Further, in the present embodiment, the entrance pupil position of the optical lens system 1000 is located on the surface of the first lens 1 facing the object side. With this arrangement, the volume of the optical system is reduced, and the aperture of the first lens 1 is reduced.

Specifically, in the present embodiment, the tertiary imaging lens group 300 includes a ninth lens 9, a tenth lens 10, an eleventh lens 11, and a twelfth lens 12, the ninth lens 9, the tenth lens 10, the eleventh lens 11, and the twelfth lens 12 completely defocus the image quality of the system to form a uniform background, so as to correct the non-uniformity of the system, and the ninth lens 9 is movably disposed along the extending direction of the optical axis, so that the optical lens system 1000 can obtain high imaging quality under both high and low temperatures and near-far focus conditions. The working temperature in the range of minus 40 ℃ to plus 60 ℃, the imaging object distance range of 10 m to infinity and the like are realized, the image quality is good, and the focal plane position is unchanged.

Specifically, in this embodiment, the seventh lens 7 is a spherical silicon lens, the concave surface of the seventh lens 7 is disposed toward the scanning galvanometer 200, the eighth lens 8 is an aspheric germanium lens, and the concave surface of the eighth lens 8 is disposed toward the scanning galvanometer 200; the ninth lens element 9 is a meniscus spherical silicon lens, the concave surface of the ninth lens element 9 faces the image side, the tenth lens element 10 is a meniscus aspherical silicon lens, the concave surface of the tenth lens element 10 faces the scanning galvanometer 200, the eleventh lens element 11 is a biconvex aspherical silicon lens, the twelfth lens element 12 is a meniscus spherical germanium lens, and the concave surface of the twelfth lens element 12 faces the image side.

Further, the focal power of the ninth lens 9 is positive, the focal power of the tenth lens 10 is positive, the focal power of the eleventh lens 11 is positive, and the focal power of the twelfth lens 12 is negative. By reasonably distributing the focal power of the lenses, adjusting the shape and the material collocation of the glass, the chromatic aberration and the secondary spectrum are effectively reduced, and the spherical aberration, the coma aberration, the astigmatism and the like on each lens are compensated and offset, so that the effect of clear imaging is achieved.

It should be noted that the basic parameter table of the optical lens system 1000 in this embodiment is shown in table 1, wherein the curvature radius and the thickness unit are both millimeters (mm).

TABLE 1

Reference numerals	Surface type	Radius of curvature	Thickness of	Refractive index
					1	Spherical surface	225	15	3.423510
2	Spherical surface	1853	12	4.022782
					3	Spherical surface	-178.65	4.1	3.42351
4	Aspherical surface	266.7	8.2	3.423510
					5	Aspherical surface	-110	8.4	4.022782
6	Aspherical surface	-63.2	4.0	3.423510
					700	Spherical surface	INFINITY	3	3.423510
7	Spherical surface	-45.7	6	3.423510
					8	Aspherical surface	-67.5	4.5	4.022782
200	Spherical surface	INFINITY	3	3.423510
					9	Spherical surface	83.56	3	3.423510
10	Aspherical surface	-15.06	5.2	3.423510
					11	Aspherical surface	58.88	4.2	3.423510
12	Spherical surface	24.6	2.5	4.022782
					400	Spherical surface	INFINITY		1	3.423510
500	Diaphragm	INFINITY	0.5	/

Further, in order to reduce the volume of the optical lens system 1000, in this embodiment, the optical lens system 1000 further includes a turning mirror 700, the turning mirror 700 is disposed between the telescopic lens system 100 and the secondary imaging lens system 105, an angle between the turning mirror 700 and the optical path is not particularly limited, and only needs to cooperate with the scanning galvanometer 200 to turn the light beam back, preferably, the turning mirror 700 and the optical path have an angle of 45 °, so that the optical path is first turned by 90 °, the turning mirror 700 and the scanning galvanometer 200 are correspondingly disposed, so that after the light beam incident from the object side is transmitted through the secondary imaging lens system 105, the turning mirror 700 reflects the light beam to the scanning galvanometer 200, and the scanning galvanometer 200 and the optical path have an angle of 45 °, so that the optical path is turned by 90 °, the scanning galvanometer 200 is then turned to the tertiary imaging lens system 300, so that the light beam exiting from the tertiary imaging lens system 300 and the propagation path of the light beam incident from the object side are parallel and in a reverse direction. The overall length of the optical lens system 1000 can be reduced.

In summary, by the movement of the zoom lens group 102, the compensation lens group 103 and the reciprocal retrace of the scanning galvanometer 200, multi-stage focal length area array scanning and continuous zoom gaze tracking are realized.

And the accurate registration of images in the full field of view in the multi-focus state scanning process is ensured, and the definition and stability of imaging are ensured.

And controlling the distortion value caused by the swinging of the scanning galvanometer 200 to be less than 1%, ensuring the accurate registration of images in the full field of view in the scanning process in a multi-range focal length state, and ensuring the clearness and stability of imaging.

When the scanning galvanometer 200 is in a system periodic scanning working state, the working frequency reaches 50-100 Hz, so that the galvanometer is required to be small in size and light in weight. The entrance pupil position of the optical lens system 1000 is located on the front surface of the first lens 1 in the front fixed lens group 101, and the system adopts a three-time imaging structure form, so that the size of a lens is reduced.

The distance between the ninth lens 9 of the tertiary imaging lens group 300 can be adjusted in front and back, so that the working temperature compensation between minus 40 ℃ and plus 60 ℃, the focusing of imaging at different distances and the non-uniform correction compensation are realized. The optical lens system 1000 has large area array search, tracking, large magnification continuous zooming, wide working temperature range and distance range of clear imaging.

The area array scanning search system comprises the following steps:

step 1, designing the telescopic system lens group 100: determining the minimum field of view increment delta omega FOV = omet of a telescopic system meeting the requirements of flyback compensation and no vignetting or light blocking according to the rotating speed of the platform, wherein omega is the rotating speed of the platform, and t is the integration time of an area array detector of the optical system; obtaining the total field of view of the telescopic system as ω FOV = ω max + Δ ω FOV, wherein ω max is the maximum value required by the field of view in the optical system;

step 2, determining the magnification M of the telescopic system with the minimum size of the scanning galvanometer 200 in the telescopic system according to the entrance pupil diameter and the structural size limit of the lens group 100 of the telescopic system;

step 3, determining the focal length F01 ' -F02 ' of the objective lens group and the focal length fe ' of the eyepiece lens group according to the multiplying power M = F0 '/fe ' of the telescopic system and the F number of the system;

step 4, strictly matching the exit pupil position of the telescope system lens group 100 with the entrance pupil position of the cubic imaging lens group 300, and placing the scanning galvanometer 200 at the exit pupil position of the telescope;

step 5, carrying out matching optimization according to the telescope system lens group 100 and the cubic imaging lens group 300 to obtain an area array scanning optical system;

step 6, moving the ninth lens 9 in the tertiary imaging lens group 300 to completely defocus the image quality of the optical lens system 1000, forming a uniform background, and thus correcting the non-uniformity of the system;

and 7, moving the ninth lens 9 in the tertiary imaging lens group 300, so that the optical lens system 1000 can obtain high imaging quality under high and low temperatures and under far and near focus conditions, thereby obtaining a focusing stroke of the ninth lens 9.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims (10)

1. An optical lens system is used for being matched with a large-area array infrared detector and is characterized by comprising a plurality of lens groups, wherein the lens groups comprise a telescopic system lens group, a scanning galvanometer, a tertiary imaging lens group, an optical window, an aperture diaphragm and an image plane which are sequentially arranged from an object side to an image side along an optical axis direction, the aperture diaphragm is used for being matched with a cold diaphragm in the infrared detector matched with the optical lens system, and the entrance pupil position of the tertiary imaging lens group is superposed with the exit pupil position of the telescopic system lens group and is positioned at the scanning galvanometer, so that light beams incident from the object side form a uniform background in imaging on the image plane;

wherein an operating wavelength band of the optical lens system is set to 3.7 to 4.8 μm, a range of a magnification ratio Γ of the optical lens system is set to 1 < Γ ≦ 20, and an F-number of the optical lens system is set to 2 ≦ F ≦ 5.5.

2. The optical lens system according to claim 1, wherein the telephoto system lens group includes a front fixed lens group, a magnification varying lens group, a compensation lens group, a rear fixed lens group, and a secondary imaging lens group, wherein at least one of the magnification varying lens group and the compensation lens group is movably disposed in an extending direction of the optical axis.

3. The optical lens system of claim 2 wherein the front fixed lens group comprises a first lens and a second lens; and/or the presence of a gas in the atmosphere,

the zoom lens group comprises a third lens which is movably arranged along the extending direction of the optical axis; and/or the presence of a gas in the gas,

the compensation lens group comprises a fourth lens and a fifth lens, and the fourth lens and the fifth lens are movably arranged along the extending direction of the optical axis; and/or the presence of a gas in the gas,

the rear fixed lens group comprises a sixth lens; and/or the presence of a gas in the gas,

the secondary imaging lens group includes a seventh lens and an eighth lens.

4. The optical lens system of claim 3, wherein the first lens is a meniscus silicon lens with a concave surface disposed toward the image side, wherein the second lens is a meniscus germanium lens with a concave surface disposed toward the image side; and/or the presence of a gas in the gas,

the third lens is a biconcave spherical silicon lens; and/or the presence of a gas in the gas,

the fourth lens is a biconvex aspheric silicon lens, the fifth lens is a meniscus aspheric germanium lens, and the concave surface of the fifth lens faces the object side; and/or the presence of a gas in the atmosphere,

the sixth lens is a meniscus aspheric silicon lens, and the concave surface of the sixth lens faces the object side; and/or the presence of a gas in the gas,

the seventh lens is a spherical silicon lens, the concave surface of the seventh lens faces the scanning galvanometer, the eighth lens is an aspheric germanium lens, and the concave surface of the eighth lens faces the scanning galvanometer.

5. The optical lens system of claim 4 wherein the optical power of the first lens is positive and the optical power of the second lens is negative; and/or the presence of a gas in the gas,

the focal power of the third lens is negative; and/or the presence of a gas in the gas,

the focal power of the fourth lens is positive, and the focal power of the fifth lens is negative;

the focal power of the sixth lens is positive; and/or the presence of a gas in the atmosphere,

the focal power of the seventh lens is negative, and the focal power of the eighth lens is positive.

6. The optical lens system of claim 3 wherein an entrance pupil position of the optical lens system is located on a surface of the first lens facing the object side.

7. The optical lens system of claim 1 wherein the tertiary imaging lens group includes a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens, the ninth lens being movably disposed along the direction of extension of the optical axis.

8. The optical lens system according to claim 7, wherein the ninth lens is a meniscus spherical silicon lens, a concave surface of the ninth lens is disposed toward the image side, the tenth lens is a meniscus aspherical silicon lens, a concave surface of the tenth lens is disposed toward the scanning galvanometer, the eleventh lens is a biconvex aspherical silicon lens, the twelfth lens is a meniscus spherical germanium lens, and a concave surface of the twelfth lens is disposed toward the image side.

9. The optical lens system of claim 8 wherein the optical power of the ninth lens is positive, the optical power of the tenth lens is positive, the optical power of the eleventh lens is positive, and the optical power of the twelfth lens is negative.

10. The optical lens system according to claim 2, further comprising a turning mirror disposed between the telephoto system lens group and the secondary imaging lens group;

the turning reflector and the scanning galvanometer are arranged correspondingly, so that after the light beam incident from the object side is transmitted by the secondary imaging lens group, the turning reflector reflects the light beam to the scanning galvanometer, and the scanning galvanometer reflects the light beam to the tertiary imaging lens group, so that the light beam emitted by the tertiary imaging lens group is parallel to and opposite to the propagation path of the light beam incident from the object side.

Images