Zoom radiation-resistant lens

Abstract

The present invention discloses a zoom radiation-resistant lens. The zoom radiation-resistant lens includes a first fixed lens group, a zoom lens group, a focusing lens group, and a second fixed lens group arranged in sequence from the object side to the image side. The positions of the first fixed lens group and the second fixed lens group are fixed, and the zoom lens group and the focusing lens group are movably arranged along the extension direction of the optical axis to have a moving stroke between approaching the object side or approaching the image side. By means of the refractive index, Abbe number, curvature, and core thickness of each lens in the first fixed lens group, the zoom lens group, the second fixed lens group, and the fifth lens group, the zoom radiation-resistant lens has a large aperture, and the overall optical length is controlled within 125 mm. When the magnification of the zoom radiation-resistant lens is 10x, the zoom radiation-resistant lens can achieve clear imaging, so as to solve the problems of aberration such as image plane bending and spherical aberration generated during zooming of the existing large-aperture zoom radiation-resistant lens.

Description

Technical Field

[0001] The present invention relates to the field of optical technologies, and particularly to a zoom radiation-resistant lens. Background Art

[0002] A radiation-resistant lens uses the principle of optical imaging to record images in a radiation environment. Since the radiation-resistant lens needs to counteract the interference of radiation rays, all the glasses used in the lens are radiation-resistant glasses. However, in existing lenses, the lens aperture is too large, and it is difficult to correct aberration changes such as image plane curvature and spherical aberration caused by changes in the object distance. Summary of the Invention

[0003] The main object of the present invention is to provide a zoom radiation-resistant lens, aiming to solve the problem that aberration such as image plane curvature and spherical aberration will occur during zooming of an existing large-aperture zoom radiation-resistant lens.

[0004] To achieve the above object, a zoom radiation-resistant lens proposed by the present invention includes a plurality of lens groups. An optical axis is correspondingly formed between the plurality of lens groups. Among them, the plurality of lens groups include:

[0005] A first fixed lens group with positive optical power, and the position of the first fixed lens group is fixed;

[0006] A variable magnification lens group with negative optical power, and the variable magnification lens group is movably arranged along the extending direction of the optical axis to have a moving stroke between approaching the object side or approaching the image side;

[0007] A focusing lens group with positive optical power, and the focusing lens group is movably arranged along the extending direction of the optical axis to have a moving stroke between approaching the object side or approaching the image side; and

[0008] A second fixed lens group with positive optical power, and the position of the second fixed lens group is fixed;

[0009] Among them, when the optical total length of the zoom radiation-resistant lens is controlled to be less than 125 mm by the refractive index, Abbe number, curvature, and core thickness of each lens in the first fixed lens group, the variable magnification lens group, the focusing lens group, and the second fixed lens group arranged in sequence from the object side to the image side, the magnification of the zoom radiation-resistant lens can reach 10x.

[0010] Optionally, the focal length of the first fixed lens group is f1, the focal length of the variable magnification lens group is f2, the focal length of the focusing lens group is f3, and the focal length of the second fixed lens group is f4, where

[0011] Optionally, the effective focal length f of the zoom radiation-resistant lens satisfies 5.1 mm ≤ f ≤ 51 mm.

[0012] Optionally, the lenses of the first fixed lens group, the zoom lens group, the focusing lens group, and the second fixed lens group are all made of radiation-resistant optical glass.

[0013] Optionally, the first fixed lens group includes a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side;

[0014] The zoom lens group includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side;

[0015] The focusing lens group includes an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged in sequence from the object side to the image side; and,

[0016] The second fixed lens group includes a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens, and an eighteenth lens arranged in sequence from the object side to the image side.

[0017] Optionally, the optical power of the first lens is negative, the optical power of the second lens is positive, and the optical power of the third lens is positive;

[0018] The optical power of the fourth lens is negative, the optical power of the fifth lens is negative, the optical power of the sixth lens is negative, and the optical power of the seventh lens is positive;

[0019] The optical power of the eighth lens is negative, the optical power of the ninth lens is positive, the optical power of the tenth lens is positive, and the optical power of the eleventh lens is negative;

[0020] The optical power of the twelfth lens is negative, the optical power of the thirteenth lens is positive, the optical power of the fourteenth lens is positive, the optical power of the fifteenth lens is negative, the optical power of the sixteenth lens is positive, the optical power of the seventeenth lens is positive, and the optical power of the eighteenth lens is negative.

[0021] Optionally, a diaphragm is provided between the zoom lens group and the focusing lens group, and the position of the diaphragm is fixedly set.

[0022] Optionally, when the zoom lens group moves axially toward the object side and the focusing lens group moves axially toward the image side, the telephoto end is zoomed to the wide-angle end. When the zoom lens group moves axially toward the image side and the focusing lens group moves axially toward the object side, the wide-angle end is zoomed to the telephoto end;

[0023] The distance between the first fixed lens group and the zoom lens group at the wide-angle end is d w1 , and the distance between the first fixed lens group and the zoom lens group at the telephoto end is d t1, the distance between the zoom lens group and the diaphragm at the wide-angle end is d w2 , the distance between the zoom lens group and the diaphragm at the telephoto end is d t2 , the distance between the diaphragm and the focusing lens group at the wide-angle end is d W3 , the distance between the diaphragm and the focusing lens group at the telephoto end is d t3 , the distance between the focusing lens group and the second fixed lens group at the wide-angle end is d W4 , the distance between the focusing lens group and the second fixed lens group at the telephoto end is d t4 , wherein,

[0024] Optionally, the lenses of the first fixed lens group, the zoom lens group, the focusing lens group and the second fixed lens group are all spherical lenses.

[0025] Optionally, the zoom radiation-resistant lens further includes a photosensitive chip, the photosensitive chip is arranged on the image side of the second fixed lens group, and the imaging surface of the photosensitive chip faces the second fixed lens group; and / or,

[0026] A filter is provided between the photosensitive chip and the second fixed lens group.

[0027] In the technical solution provided by the present invention, the zoom lens group and the focusing lens group are respectively movably arranged along the extension direction of the optical axis. The zoom lens group moves cooperatively along the optical axis direction so that the zoom radiation-resistant lens zooms from the wide-angle end to the telephoto end, and the focusing lens group is driven by an external force to move along the optical axis for focusing corresponding to the position, imaging wavelength, and imaging object distance of the zoom lens group, so that the imaging surface of the zoom radiation-resistant lens remains clear during the zooming process. Through the reasonable setting of the four lens groups and the conditional limitations on the refractive index, Abbe number, curvature, and core thickness of each lens in the first fixed lens group, the zoom lens group, the focusing lens group, and the second fixed lens group, the zoom radiation-resistant lens has a large aperture, the total optical length is controlled within 125 mm, and when the magnification of the zoom radiation-resistant lens is 10x, the zoom radiation-resistant lens can clearly image, so as to solve the problems of image surface bending, spherical aberration and other aberrations generated when the existing large-aperture zoom radiation-resistant lens zooms. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0029] Figure 1 Schematic diagram of the wide-angle end of the zoom radiation-resistant lens body provided by the present invention;

[0030] Figure 2 is Figure 1 Schematic diagram of the telephoto end of the zoom radiation-resistant lens body in

[0031] Figure 3 is Figure 1 MTF curve graph of the wide-angle end of the zoom radiation-resistant lens body in

[0032] Figure 4 is Figure 1 MTF curve graph of the middle end of the zoom radiation-resistant lens body in

[0033] Figure 5 is Figure 1 MTF curve graph of the telephoto end of the zoom radiation-resistant lens body in

[0034] Explanation of the reference numerals in the drawings:

[0035] Label Name Label Name 1000 Zoom radiation-resistant lens 10 Tenth lens 100 First fixed lens group 11 Eleventh lens 1 First lens 400 Second fixed lens group 2 Second lens 12 Twelfth lens 3 Third lens 13 Thirteenth lens 200 Zoom lens group 14 Fourteenth lens 4 Fourth lens 15 Fifteenth lens 5 Fifth lens 16 Sixteenth lens 6 Sixth lens 17 Seventeenth lens 7 Seventh lens 18 Eighteenth lens 300 Focus lens group 500 Diaphragm 8 Eighth lens 600 Image sensor chip 9 Ninth lens

[0036] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if the embodiments of the present invention involve descriptions such as "first" and "second", the descriptions of "first", "second", etc. are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] Currently, radiation-resistant lenses use the principle of optical imaging to record images in a radiation environment. Radiation-resistant lenses need to offset the interference of radiation rays, so the glass used in the lenses is all radiation-resistant glass. However, in existing lenses, the lens aperture is too large, and it is very difficult to correct aberration changes such as image plane curvature and spherical aberration caused by changes in the object distance.

[0041] To solve the above problems, the present invention provides a zoom radiation-resistant lens 1000, Figure 1 and Figure 2 is a specific embodiment of the zoom radiation-resistant lens 1000 provided by the present invention.

[0042] Please refer to Figure 1 , the zoom radiation-resistant lens 1000 includes a plurality of lens groups, and an optical axis is correspondingly formed between the plurality of lens groups. Among them, the plurality of lens groups include a first fixed lens group 100, a variable magnification lens group 200, a focusing lens group 300, and a second fixed lens group 400: the first fixed lens group 100 has a positive optical power, and the position of the first fixed lens group 100 is fixed; the variable magnification lens group 200 has a negative optical power, and the variable magnification lens group 200 is movably arranged along the extension direction of the optical axis to have a moving stroke between approaching the object side or approaching the image side; the focusing lens group 300 has a positive optical power, and the focusing lens group 300 is movably arranged along the extension direction of the optical axis to have a moving stroke between approaching the object side or approaching the image side; the second fixed lens group 400 has a positive optical power, and the position of the second fixed lens group 400 is fixed; wherein, by the refractive index, Abbe number, curvature, and core thickness of each lens in the first fixed lens group 100, the variable magnification lens group 200, the focusing lens group 300, and the second fixed lens group 400 arranged in sequence from the object side to the image side, when the optical total length of the zoom radiation-resistant lens 1000 is controlled to be less than 125 mm, the magnification of the zoom radiation-resistant lens 1000 can be achieved to be 10x.

[0043] In the technical solution provided by the present invention, the zoom lens group 200 and the focusing lens group 300 are movably arranged respectively along the extending direction of the optical axis. The zoom lens group 200 moves coordinately along the optical axis direction so that the zoom radiation-resistant lens 1000 zooms from the wide-angle end to the telephoto end. And the focusing lens group 300 is driven by an external force to move and focus along the optical axis corresponding to the position, imaging wavelength, and imaging object distance of the zoom lens group 200, so that the imaging surface of the zoom radiation-resistant lens 1000 remains clear during the zooming process. Through the reasonable setting of the four lens groups and the conditional limitations on the refractive index, Abbe number, curvature, and core thickness of each lens in the first fixed lens group 100, the zoom lens group 200, the focusing lens group 300, and the second fixed lens group 400, the zoom radiation-resistant lens 1000 has a large aperture and the overall optical length is controlled within 125 mm. When the magnification of the zoom radiation-resistant lens 1000 reaches 10x, the zoom radiation-resistant lens 1000 can achieve clear imaging, so as to solve the problems of aberration such as field curvature and spherical aberration generated when the existing large-aperture zoom radiation-resistant lens 1000 zooms.

[0044] It should be noted that both the zoom lens group 200 and the focusing lens group 300 can be driven by an external force to move along the optical axis direction. Among them, the external force drive can be driven by a driving motor or manually adjusted by a human, and no limitation is made here.

[0045] Specifically, in order to enable each spherical lens to cooperate with each other to achieve the required effect, in this embodiment, the focal length of the first fixed lens group 100 is f1, the focal length of the zoom lens group 200 is f2, the focal length of the focusing lens group 300 is f3, and the focal length of the second fixed lens group 400 is f4, where In this way, through the setting of the focal length ratio, the minimum focal length of the zoom radiation-resistant lens 1000 can reach 5.1 mm, and the maximum focal length of the zoom radiation-resistant lens 1000 can be controlled to reach 51 mm, realizing a magnification of 10x.

[0046] Specifically, considering the influence of temperature change, the lens made of glass material has the characteristics of high hardness, strong wear resistance and long service life. Moreover, the all-glass lens has stable chemical properties and is not easily affected by thermal expansion and contraction to cause focus shift, nor is it easily corroded. The all-glass lens can well resist the problem of lens deformation caused by heat and maintain high precision of the lens for a long time. Therefore, in this embodiment, the lenses of the first fixed lens group 100, the zoom lens group 200, the focusing lens group 300 and the second fixed lens group 400 are all made of radiation-resistant optical glass. Radiation-resistant optical glass refers to a special optical glass with little decrease in transmittance and not serious color change under the irradiation of a large dose of exciting photons and particles, also known as stabilized glass. This type of glass is generally melted by adding CeO2 to the optical glass formula. Therefore, they generally have the same optical constants as ordinary optical glass. And the glass material enables the zoom radiation-resistant lens 1000 to ensure sufficient clarity of the lens in high and low temperature environments under the focusing condition at room temperature of 20°C when used in actual high and low temperature changes.

[0047] Specifically, in this embodiment, the first fixed lens group 100 includes a first lens 1, a second lens 2 and a third lens 3 arranged in sequence from the object side to the image side; the zoom lens group 200 includes a fourth lens 4, a fifth lens 5, a sixth lens 6 and a seventh lens 7 arranged in sequence from the object side to the image side; the focusing lens group 300 includes an eighth lens 8, a ninth lens 9, a tenth lens 10 and an eleventh lens 11 arranged in sequence from the object side to the image side; the second fixed lens group 400 includes a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, a fifteenth lens 15, a sixteenth lens 16, a seventeenth lens 17 and an eighteenth lens 18 arranged in sequence from the object side to the image side. Specifically, in this embodiment, the optical power of the first lens 1 is negative, the optical power of the second lens 2 is positive, and the optical power of the third lens 3 is positive; the optical power of the fourth lens 4 is negative, the optical power of the fifth lens 5 is negative, the optical power of the sixth lens 6 is negative, and the optical power of the seventh lens 7 is positive; the optical power of the eighth lens 8 is negative, the optical power of the ninth lens 9 is positive, the optical power of the tenth lens 10 is positive, and the optical power of the eleventh lens 11 is negative; the optical power of the twelfth lens 12 is negative, the optical power of the thirteenth lens 13 is positive, the optical power of the fourteenth lens 14 is positive, the optical power of the fifteenth lens 15 is negative, the optical power of the sixteenth lens 16 is positive, the optical power of the seventeenth lens 17 is positive, and the optical power of the eighteenth lens 18 is negative. With such a setting, the optimal correction of high-order aberrations and chromatic aberrations is achieved, and at the same time, vignetting is set to block peripheral stray light without affecting the illuminance, so as to ensure the same resolution requirements for the center and edge of the image plane.

[0048] Further, in order to improve the imaging quality, in this embodiment, a diaphragm 500 is provided between the zoom lens group 200 and the focusing lens group 300, and the position of the diaphragm 500 is fixedly set. The diaphragm 500 restricts the light passing aperture of the on-axis beam to block part of the light during the zoom process, reduces the light spot, improves the image contrast, and helps to improve the image quality.

[0049] Specifically, in this embodiment, when the zoom lens group 200 moves axially toward the object side and the focusing lens group 300 moves axially toward the image side, the telephoto end is zoomed to the wide-angle end. When the zoom lens group 200 moves axially toward the image side and the focusing lens group 300 moves axially toward the object side, the wide-angle end is zoomed to the telephoto end; the distance between the first fixed lens group 100 and the zoom lens group 200 at the wide-angle end is d w1 , and the distance between the first fixed lens group 100 and the zoom lens group 200 at the telephoto end is d t1 , the distance between the zoom lens group 200 and the diaphragm 500 at the wide-angle end is d w2 , the distance between the zoom lens group 200 and the diaphragm 500 at the telephoto end is d t2 , the distance between the diaphragm 500 and the focusing lens group 300 at the wide-angle end is d W3 , the distance between the diaphragm 500 and the focusing lens group 300 at the telephoto end is d t3 , the distance between the focusing lens group 300 and the second fixed lens group 400 at the wide-angle end is d W4 , the distance between the focusing lens group 300 and the second fixed lens group 400 at the telephoto end is d t4 , where By setting like this, the working F-number of the zoom radiation-resistant lens 1000 can be realized in the range of 1.75 - 3.5 from the wide-angle end to the telephoto end.

[0050] Further, in this embodiment, the lenses of the first fixed lens group 100, the zoom lens group 200, the focusing lens group 300, and the second fixed lens group 400 are all spherical lenses. Since the reflection of spherical lenses obeys the law of light reflection, converges or diverges light, and aspherical lenses can correct spherical aberration. On the premise of ensuring image quality and reliability, the cost is reduced, the assembly sensitivity is relatively low, and the finished product yield is improved.

[0051] Specifically, in this embodiment, the zoom radiation-resistant lens 1000 further includes an image sensor chip 600. The image sensor chip 600 is disposed on the image side of the second fixed lens group 400, and the imaging surface of the image sensor chip 600 faces the second fixed lens group 400. In this way, the imaging surface of the image sensor chip 600 receives the object image on the image side, and the image sensor chip 600 processes the received object image.

[0052] Further, a filter is disposed between the image sensor chip 600 and the second fixed lens group 400. The filter can effectively filter out stray light in non-working wavelength bands to reduce optical noise and make it easier for the subsequent optoelectronic module processing part. The filter can also be used to adjust the color degree of the object image during final imaging.

[0053] Specifically, the imaging surface can be understood as the surface of the image sensor chip facing the object side, that is, it can be the surface of a CCD or CMOS imaging element. It can be understood that the light carrying the information of the object to be photographed can sequentially pass through the first fixed lens group 100, the zoom lens group 200, the aperture 500, the focusing lens group 300, the second fixed lens group 400, the filter lens and finally form an image on the imaging surface.

[0054] It should be noted that, please refer to Figure 2 , the basic parameter table of the zoom radiation-resistant lens 1000 in this embodiment is shown in Table 1, where the unit of the radius of curvature and the thickness is millimeter (mm).

[0055] Table 1

[0056]

[0057]

[0058] S1 to S33 in Table 1 represent the surface numbers of each optical element, R represents the radius of curvature of the optical element, D represents the thickness of the optical element or the air gap, Nd represents the refractive index of the d light of the optical material used, and Vd represents the Abbe number of the d light of the optical material used. Specifically, the surface STOP of the diaphragm 500, the incident surface S1 of the first lens 1, the exit surface S2 of the first lens 1, the incident surface S3 of the second lens 2, the exit surface S4 of the second lens 2, the incident surface S5 of the third lens 3, the exit surface S6 of the third lens 3, the incident surface S7 of the fourth lens 4, the exit surface S8 of the fifth lens 5, the incident surface S9 of the sixth lens 6, the exit surface S10 of the sixth lens 6, the incident surface S11 of the seventh lens 7, the exit surface S12 of the seventh lens 7, the incident surface S15 of the eighth lens 8, the exit surface S16 of the eighth lens 8, the exit surface S17 of the ninth lens 9, the incident surface S18 of the tenth lens 10, the exit surface S19 of the tenth lens 10, the incident surface S20 of the eleventh lens 11, the exit surface S21 of the eleventh lens 11, the incident surface S22 of the twelfth lens 12, the exit surface S23 of the twelfth lens 12, the exit surface S24 of the thirteenth lens 13, the incident surface S25 of the fourteenth lens 14, the exit surface S26 of the fourteenth lens 14, the incident surface S27 of the fifteenth lens 15, the exit surface S28 of the fifteenth lens 15, the incident surface S29 of the sixteenth lens 16, the exit surface S30 of the sixteenth lens 16, the incident surface S31 of the seventeenth lens 17, the exit surface S32 of the seventeenth lens 17, the exit surface S33 of the eighteenth lens 18.

[0059] Among them, the distances between the lens groups at the wide-angle end and the telephoto end are shown in Table 2:

[0060] Table 2

[0061] D1 D2 D3 D4 Wide-angle end 0.1 36.4 10.2 1.3 Telephoto end 35.1 1.4 2.8 8.7

[0062] D1 in Table 2 represents the variable distance between the first fixed lens group 100 and the variable magnification lens group 200, D2 represents the variable distance between the variable magnification lens group 200 and the diaphragm 500, D3 represents the variable distance between the diaphragm 500 and the focusing lens group 300, and D4 represents the variable distance between the focusing lens group 300 and the second fixed lens group 400.

[0063] Figure 4 The MTF (Modulation Transfer Function) curve graph showing the wide-angle end of the zoom radiation-resistant lens body, the horizontal axis of the curve graph represents the image height (distance from the imaging center in mm), and the vertical axis represents the contrast value (value is 1).

[0064] Figure 5Show the MTF (Modulation Transfer Function) curve of the middle end of the zoom radiation-resistant lens body. The horizontal axis of the curve represents the image height (distance from the imaging center in mm), and the vertical axis represents the contrast value (value is 1).

[0065] As can be seen from the above figure, the spherical aberration, field curvature, and distortion of the zoom radiation-resistant lens in this embodiment can be well corrected at the middle end, wide-angle end, and telephoto end respectively.

[0066] As can be seen from the above figure, the spherical aberration, field curvature, and distortion of the zoom radiation-resistant lens in this embodiment can be well corrected at the middle end, wide-angle end, and telephoto end respectively.

[0067] In summary, the zoom lens of the present invention adopts a four-group structure of "positive-negative-positive-positive + spherical surface", including one zoom group, one focusing group, and two fixed groups. As the second lens group and the third lens group move correspondingly, the focal length changes. The fourth lens group is used for focusing, and the focal length can vary from <5.1 mm at the wide-angle end to >51 mm at the telephoto end, realizing large-aperture zoom and improving image plane curvature, spherical aberration, and chromatic aberration. And all the lenses in the zoom radiation-resistant lens are radiation-resistant spherical glass lenses, fully ensuring good optical performance.

[0068] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A zoom radiation-resistant lens, characterized in that, Comprising a plurality of lens groups, an optical axis is correspondingly formed between the plurality of lens groups, wherein the plurality of lens groups include: A first fixed lens group with a positive optical power, and the position of the first fixed lens group is fixed; A zoom lens group with a negative optical power, and the zoom lens group is movably arranged along the extending direction of the optical axis to have a moving stroke between approaching the object side and approaching the image side; A focusing lens group with a positive optical power, and the focusing lens group is movably arranged along the extending direction of the optical axis to have a moving stroke between approaching the object side and approaching the image side; and A second fixed lens group with a positive optical power, and the position of the second fixed lens group is fixed; Wherein, by the refractive index, Abbe number, curvature and core thickness of each lens in the first fixed lens group, the zoom lens group, the focusing lens group and the second fixed lens group arranged in sequence from the object side to the image side, when the optical total length of the zoom radiation-resistant lens is controlled to be less than 125 mm, the magnification of the zoom radiation-resistant lens can reach 10x; The focal length of the first fixed lens group is , the focal length of the zoom lens group is , the focal length of the focusing lens group is , the focal length of the second fixed lens group is , where , , ; The effective focal length of the zoom radiation-resistant lens is f, and 5.1 mm ≤ f ≤ 51 mm; The lens materials of the first fixed lens group, the zoom lens group, the focusing lens group and the second fixed lens group are all radiation-resistant optical glass; The first fixed lens group includes a first lens, a second lens and a third lens arranged in sequence from the object side to the image side; The zoom lens group includes a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the object side to the image side; The focusing lens group includes an eighth lens, a ninth lens, a tenth lens and an eleventh lens arranged in sequence from the object side to the image side; The second fixed lens group includes a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens and an eighteenth lens arranged in sequence from the object side to the image side; The optical power of the first lens is negative, the optical power of the second lens is positive, and the optical power of the third lens is positive; The optical power of the fourth lens is negative, the optical power of the fifth lens is negative, the optical power of the sixth lens is negative, and the optical power of the seventh lens is positive; The optical power of the eighth lens is negative, the optical power of the ninth lens is positive, the optical power of the tenth lens is positive, and the optical power of the eleventh lens is negative; The optical power of the twelfth lens is negative, the optical power of the thirteenth lens is positive, the optical power of the fourteenth lens is positive, the optical power of the fifteenth lens is negative, the optical power of the sixteenth lens is positive, the optical power of the seventeenth lens is positive, and the optical power of the eighteenth lens is negative.

2. The zoom radiation-resistant lens according to claim 1, wherein, An aperture stop is provided between the zoom lens group and the focusing lens group, and the position of the aperture stop is fixedly arranged.

3. The zoom radiation-resistant lens according to claim 2, wherein When the zoom lens group moves along the optical axis towards the object side and the focusing lens group moves along the optical axis towards the image side, the telephoto end is zoomed towards the wide-angle end. When the zoom lens group moves along the optical axis towards the image side and the focusing lens group moves along the optical axis towards the object side, the wide-angle end is zoomed towards the telephoto end; The distance between the first fixed lens group and the zoom lens group at the wide-angle end is ; the distance between the first fixed lens group and the zoom lens group at the telephoto end is ; the distance between the zoom lens group and the diaphragm at the wide-angle end is ; the distance between the zoom lens group and the diaphragm at the telephoto end is ; the distance between the diaphragm and the focusing lens group at the wide-angle end is ; the distance between the diaphragm and the focusing lens group at the telephoto end is ; the distance between the focusing lens group and the second fixed lens group at the wide-angle end is ; the distance between the focusing lens group and the second fixed lens group at the telephoto end is , where , , , .

4. The zoom radiation-resistant lens according to claim 1, wherein The lenses of the first fixed lens group, the zoom lens group, the focusing lens group and the second fixed lens group are all spherical lenses.

5. The zoom radiation-resistant lens according to any one of claims 1 to 4, characterized in that The zoom radiation-resistant lens further includes an image sensor chip, the image sensor chip is disposed on a side of the second fixed lens group facing the image side, and the imaging surface of the image sensor chip faces the second fixed lens group; and / or, A filter is disposed between the image sensor chip and the second fixed lens group.

Images