Zoom lens and photographic apparatus

Abstract

The application discloses a zoom lens and a photographic equipment. The zoom lens comprises a plurality of lenses. At least part of the plurality of lenses are aspherical lenses, so as to reduce small aberration. The plurality of lenses respectively form a first lens group, a second lens group and a third lens group, so as to increase the aperture size of the zoom lens. The plurality of lenses are sequentially named as the first to the fourteenth lenses. The optical power of the fifth lens is positive, the optical power of the sixth lens is positive, 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 negative, and the optical power of the eleventh lens is positive. In the technical scheme of the application, the plurality of lenses are sequentially arranged between the object side and the image side, so as to increase the aperture of the zoom lens, and the plurality of aspherical lenses correct aberration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical lens, in particular to a zoom lens and a photographic equipment. BACKGROUND

[0002] Some photographic equipment sometimes needs to be taken in the dark environment, and the darkness makes the imaging of the photographic equipment more difficult, resulting in poor shooting effect. The existing zoom lens in the photographic equipment is difficult to shoot a clear color image in the dark environment, and this requires the zoom lens to have a larger aperture, otherwise it is difficult to capture a clear image. SUMMARY

[0003] The main purpose of the present application is to provide a zoom lens and a photographic equipment, which aims to solve the problem that the aperture of the existing zoom lens is small, which makes it difficult to shoot a clear color image in the dark environment.

[0004] To achieve the above purpose, the present application provides a zoom lens, which has an object side and an image side arranged oppositely along the extension direction of the optical axis, and comprises a plurality of lenses arranged in order from the object side to the image side, wherein the plurality of lenses respectively form a first lens group, a second lens group and a third lens group, wherein each lens in the first lens group is a first lens, a second lens, a third lens and a fourth lens arranged in order from the object side to the image side, the second lens group comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens arranged in order from the object side to the image side, the third lens group comprises a twelfth lens, a thirteenth lens and a fourteenth lens arranged in order from the object side to the image side, and at least part of the plurality of lenses are aspherical lenses.

[0005] Wherein, the optical power of the fifth lens is positive, the optical power of the sixth lens is positive, 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 negative, and the optical power of the eleventh lens is positive.

[0006] Optionally, the zoom lens further comprises a lens barrel, and the first lens group and the second lens group are movably arranged along the extension direction of the optical axis in the lens barrel, and the third lens group is fixedly installed in the lens barrel.

[0007] Optionally, the zoom lens further comprises a variable diaphragm arranged between the first lens group and the second lens group.

[0008] The distance between the first lens group and the variable aperture during movement of the first lens group is not less than 1.177 mm and not more than 19.787 mm, so as to cooperatively adjust the F number of the zoom lens to be less than 1.2 with the variable aperture.

[0009] Optionally, the zoom lens further comprises a variable aperture disposed between the first lens group and the second lens group.

[0010] The distance between the second lens group and the variable aperture during movement of the second lens group is not less than 0.615 mm and not more than 11.324 mm.

[0011] Optionally, two of the lenses form a complementary lens group, and the material of one of the two lenses in each complementary lens group comprises crown glass, and the material of the other of the two lenses in each complementary lens group comprises flint glass.

[0012] Optionally, the third lens and the fourth lens form a complementary lens group; and / or,

[0013] the fifth lens and the sixth lens form a complementary lens group; and / or,

[0014] the seventh lens and the eighth lens form a complementary lens group; and / or,

[0015] the tenth lens and the eleventh lens form a complementary lens group; and / or,

[0016] the thirteenth lens and the fourteenth lens form a complementary lens group.

[0017] Optionally, the second lens, the fifth lens, the eleventh lens and the fourteenth lens are aspherical lenses.

[0018] Optionally, the zoom lens further comprises optical cement:

[0019] the optical cement bonds the third lens and the fourth lens; and / or,

[0020] the optical cement bonds the seventh lens and the eighth lens; and / or,

[0021] the optical cement bonds the ninth lens and the tenth lens.

[0022] Optionally, the first lens group has a negative focal power, the second lens group has a positive focal power, and the third lens group has a negative focal power.

[0023] The application further provides a photographing device comprising the zoom lens as described above, the zoom lens having an object side and an image side oppositely arranged along the extension direction of the optical axis, the zoom lens comprising a plurality of lenses arranged in sequence from the object side to the image side, the plurality of lenses respectively forming a first lens group, a second lens group and a third lens group, wherein each of the lenses in the first lens group is a first lens, a second lens, a third lens and a fourth lens arranged in sequence from the object side to the image side, the second lens group comprises a fifth lens, a sixth lens, a seventh lens, 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 third lens group comprises a twelfth lens, a thirteenth lens and a fourteenth lens arranged in sequence from the object side to the image side, and at least part of the plurality of lenses are aspherical lenses.

[0024] wherein the fifth lens has positive refractive power, the sixth lens has positive refractive power, the seventh lens has positive refractive power, the eighth lens has negative refractive power, the ninth lens has positive refractive power, the tenth lens has negative refractive power, and the eleventh lens has positive refractive power.

[0025] In the technical scheme of the application, the plurality of lenses are arranged in sequence between the object side and the image side, thereby increasing the aperture of the zoom lens. In the application, the plurality of lenses are the first to fourteenth lenses arranged in sequence from the object side to the image side, but the specific number of the plurality of lenses can be adjusted according to actual use requirements. The plurality of lenses are divided into the first lens group, the second lens group and the third lens group from the object side to the image side, wherein the second lens group has more lenses, and in the scheme, the second lens group is the fifth to eleventh lenses. The refractive power of each lens in the second lens group is calculated, thereby cooperating with the first lens group and the second lens group to perform photographing.

[0026] It is to be explained that the scheme increases the aperture size of the zoom lens by arranging the plurality of lenses and dividing them into a plurality of lens groups. However, this may cause large aberration of the zoom lens, affecting normal photographing. Therefore, part of the plurality of lenses are aspherical lenses, thereby reducing small aberration, and the specific number and specific distribution position of the aspherical lenses can be adjusted according to actual requirements, which are not specifically limited herein. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description only show some of the embodiments of the present application, and the ordinary skilled in the art can obtain other drawings from the drawings shown without any creative effort.

[0028] Figure 1 The structural schematic diagram of an embodiment of the zoom lens provided by the present application.

[0029] Explanation of reference signs:

[0030] Reference Name Reference Name 100 Zoom lens 1 First lens group 11 First lens 12 Second lens 13 Third lens 14 Fourth lens 2 Second lens group 21 Fifth lens 22 Sixth lens 23 Seventh lens 24 Eighth lens 25 Ninth lens 26 Tenth lens 27 Eleventh lens 3 Third lens group 31 Twelfth lens 32 Thirteenth lens 33 Fourteenth lens 4 Variable aperture 200 Optical axis

[0031] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the ordinary skilled in the art without any creative effort fall within the protection scope of the present application.

[0033] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0034] In addition, if the embodiments of the present application involve descriptions of “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with “first” and “second” can explicitly or implicitly include at least one of the features. In addition, the meaning of “and / or” appearing throughout the text includes three parallel solutions. Taking “A and / or B” as an example, it includes A solution, or B solution, or A and B solutions. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that the ordinary skilled in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0035] Some photography equipment sometimes needs to take pictures in dark environment, and the darkness makes the imaging of the photography equipment more difficult, resulting in poor shooting effect. The zoom lens in the existing photography equipment is difficult to shoot clear color images in dark environment, which requires the zoom lens to have a larger aperture, otherwise it is difficult to capture clear images.

[0036] In view of this, the present application provides a zoom lens, aiming to solve the problem that the aperture of the existing zoom lens is small, making it difficult to shoot clear color images in dark environment. Figure 1 An embodiment of the zoom lens provided by the present application.

[0037] Please refer to Figure 1 The zoom lens 100 provided by the present application has an object side and an image side arranged opposite along the extension direction of the optical axis 200, and the zoom lens 100 comprises a plurality of lenses arranged in sequence from the object side to the image side, and the plurality of lenses respectively form a first lens group 1, a second lens group 2 and a third lens group 3. Each of the lenses in the first lens group 1 is a first lens 11, a second lens 12, a third lens 13 and a fourth lens 14 arranged in sequence from the object side to the image side. The second lens group 2 comprises a fifth lens 21, a sixth lens 22, a seventh lens 23, an eighth lens 24, a ninth lens 25, a tenth lens 26 and an eleventh lens 27 arranged in sequence from the object side to the image side. The third lens group 3 comprises a twelfth lens 31, a thirteenth lens 32 and a fourteenth lens 33 arranged in sequence from the object side to the image side. At least part of the plurality of lenses is a non-spherical lens. The focal power of the fifth lens 21 is positive, the focal power of the sixth lens 22 is positive, the focal power of the seventh lens 23 is positive, the focal power of the eighth lens 24 is negative, the focal power of the ninth lens 25 is positive, the focal power of the tenth lens 26 is negative, and the focal power of the eleventh lens 27 is positive.

[0038] In the technical solution of the present application, a plurality of lenses are arranged in sequence between the object side and the image side, thereby increasing the aperture of the zoom lens 100. In the present application, the plurality of lenses are first to fourteenth lenses 33 in sequence from the object side to the image side, but the specific number of the plurality of lenses is not necessarily fourteen, and can be adjusted according to actual use requirements. The plurality of lenses are divided into the first lens group 1, the second lens group 2 and the third lens group 3 in sequence from the object side to the image side, and the number of lenses in the second lens group 2 is more. In the present solution, the second lens group 2 is the fifth to eleventh lenses 27. The focal power of each lens in the second lens group 2 is calculated, thereby cooperating with the first lens group 1 and the second lens group 2 to shoot.

[0039] It is to be explained that the scheme increases the aperture size of the zoom lens 100 by setting multiple lenses and dividing them into multiple lens groups. However, this may cause large aberration of the zoom lens 100, affecting normal shooting. Therefore, part of the multiple lenses are aspherical lenses, thereby reducing small aberration, and the specific number and specific distribution position of the aspherical lenses can be adjusted according to actual needs, which are not specifically limited here.

[0040] Further, the zoom lens 100 further includes a lens barrel, the first lens group 1 and the second lens group 2 are movably arranged in the extension direction of the optical axis 200 of the lens barrel, and the third lens group 3 is fixedly arranged in the lens barrel.

[0041] In the embodiment, the zoom lens 100 needs to movably arrange at least one of the first lens group 1, the second lens group 2 and the third lens group 3 in order to increase the zooming capability. However, at least one of the first lens group 1, the second lens group 2 and the third lens group 3 should be fixedly arranged, thereby reducing the aberration of the zoom lens 100 and ensuring stable shooting of the zoom lens 100. Among the first lens group 1, the second lens group 2 and the third lens group 3, the third lens group 3 is closest to the image side, which enables the third lens group 3 to stably reduce the aberration of the zoom lens 100, so it is more appropriate to fix the third lens group 3. In order to the zooming capability of the zoom lens 100, it is more appropriate to movably arrange the first lens group 1 and the second lens group 2 which are closer to the object side in the zoom lens 100. Of course, the arrangement mode of each lens group in the zoom lens 100 can be adjusted according to the use requirement, and there is not only one embodiment of the present embodiment, for example, the first lens group 1 is movably arranged, and the second lens group 2 and the third lens group 3 are fixedly arranged.

[0042] Further, the zoom lens 100 further includes a variable aperture 4 arranged between the first lens group 1 and the second lens group 2; the distance between the first lens group 1 and the variable aperture 4 during the movement of the first lens group 1 is not less than 1.177 mm and not greater than 19.787 mm, so as to jointly adjust the F number of the zoom lens 100 to be less than 1.2 with the variable aperture 4.

[0043] In the embodiment, the F number is an important parameter of the zoom lens 100, and in fact, the F number is determined by the distance from the first lens group 1 to the object side and the size of the variable aperture 4. In the technical solution of the embodiment, the variable aperture 4 can adjust the size of the aperture according to the position of the first lens group 1, so as to adjust the size of the F number. Generally, the smaller the F number is, the better the imaging effect of the zoom lens 100 is, and therefore, in the embodiment, the zoom lens 100 keeps the F number below 1.2 by adjusting the first lens group 1 and the variable aperture 4.

[0044] It is to be explained that the position of the first lens group 1 needs to be moved according to the focusing requirement, and therefore, the moving range of the first lens group 1 is limited. In the embodiment, the distance between the first lens group 1 and the variable aperture 4 is not less than 1.177 mm and not more than 19.787 mm during the movement of the first lens group 1, and in this range, the focusing effect of the first lens group 1 is better, and the adjusting ability of the variable aperture 4 on the aperture can also adjust the F number to below 1.2 in this range.

[0045] Further, the zoom lens 100 further comprises a variable aperture 4 arranged between the first lens group 1 and the second lens group 2, and the distance between the second lens group 2 and the variable aperture 4 is greater than or equal to 0.615 mm and less than or equal to 11.324 mm during the movement of the second lens group 2.

[0046] In the embodiment, the second lens group 2 needs to adjust the position according to the focusing requirement when the zoom lens 100 is shooting, but the zoom lens 100 further comprises the variable aperture 4 arranged between the first lens group 1 and the second lens group 2, which makes the second lens group 2 move between the variable aperture 4 and the third lens group 3, and therefore, there is a certain limitation. Therefore, in the embodiment, the distance between the second lens group 2 and the variable aperture 4 is greater than or equal to 0.615 mm and less than or equal to 11.324 mm during the movement of the second lens group 2, so as to ensure the normal zoom of the zoom lens 100.

[0047] Further, two of the plurality of lenses form a complementary lens group, and the material of one of the two lenses in each complementary lens group comprises crown glass, and the material of the other lens comprises flint glass.

[0048] The zoom lens 100 may encounter a dark environment in specific application, at which the zoom lens 100 is difficult to take a picture by using visible light. Therefore, in the embodiment, the complementary lens group is set to make the Abbe number and refractive index of two lenses in the complementary lens group complementary, thereby increasing the resolving power of the zoom lens 100 to infrared waveband light. Specifically, one of the two lenses in the complementary lens group is made of crown glass, which makes the refractive index of the lens larger and the Abbe number larger, and the other is made of flint glass, which makes the refractive index of the lens larger and the Abbe number smaller, so as to cooperate with each other.

[0049] In the present application, the specific composition of the complementary lens group is not limited, as long as it can increase the resolving power to infrared waveband light. In a specific embodiment of the present application, the third lens 13 and the fourth lens 14 form a complementary lens group. Of course, the complementary lens group can also be formed by the fifth lens 21 and the sixth lens 22, the seventh lens 23 and the eighth lens 24, the tenth lens 26 and the eleventh lens 27, or the thirteenth lens 32 and the fourteenth lens 33, which is not specifically limited here.

[0050] Of course, the complementary lens group can also be provided in multiple, and multiple complementary lens groups can be formed by the fifth lens 21 and the sixth lens 22, the seventh lens 23 and the eighth lens 24, the tenth lens 26 and the eleventh lens 27, or the thirteenth lens 32 and the fourteenth lens 33, respectively. Multiple complementary lens groups make the resolving power of the zoom lens 100 to infrared waveband light stronger.

[0051] Further, the second lens 12, the fifth lens 21, the eleventh lens 27 and the fourteenth lens 33 are aspherical lenses.

[0052] In the embodiment, the zoom lens 100 is provided with multiple lenses to increase the aperture, but this may result in a larger aberration of the zoom lens 100. The aspherical lens can reduce the aberration of the zoom lens 100, so multiple aspherical lenses are included in the multiple lenses to correct the aberration.

[0053] Specifically, the second lens 12, the fifth lens 21, the eleventh lens 27 and the fourteenth lens 33 are aspherical lenses. The fifth lens 21 is the lens closest to the object side in the second lens group 2, and the eleventh lens 27 is the lens closest to the image side in the second lens group 2, which makes the fifth lens 21 and the eleventh lens 27 better at correcting aberrations when they are aspherical lenses. The fourteenth lens 33 is the lens closest to the image side, so the fifth lens 21 and the eleventh lens 27 are better at correcting aberrations when they are aspherical lenses. The second lens 12 is also a lens closer to the object side, so it is also better at correcting aberrations. Therefore, in this embodiment, by selecting lenses in appropriate positions as aspherical lenses, not only can the zoom lens 100's ability to correct aberrations be enhanced, but the number of aspherical lenses can also be reduced to some extent, thereby reducing production costs.

[0054] Further, the zoom lens 100 increases the aperture by arranging multiple lenses, which results in large aberrations in the zoom lens 100, which is one of the difficulties that existing zoom lenses 100 cannot overcome. The zoom lens 100 corrects aberrations by arranging multiple aspherical lenses in multiple lenses, but the use of aspherical lenses is relatively expensive, so in use, the use of aspherical lenses is generally minimized. Therefore, in this application, aberrations are also corrected in other ways to reduce the use of aspherical lenses. Specifically, the zoom lens 100 also includes optical glue that bonds the third lens 13 and the fourth lens 14, thereby reducing the aberrations between the third lens 13 and the fourth lens 14; in another embodiment of the application, the optical glue can also bond the seventh lens 23 and the eighth lens 24, thereby reducing the aberrations between the seventh lens 23 and the eighth lens 24; and in yet another embodiment of the application, the optical glue can also bond the ninth lens 25 and the tenth lens 26, thereby reducing the aberrations between the ninth lens 25 and the tenth lens 26.

[0055] Of course, the optical glue can bond the third lens 13 and the fourth lens 14, the seventh lens 23 and the eighth lens 24, and the ninth lens 25 and the tenth lens 26 at the same time, thereby making the zoom lens 100 better at correcting aberrations.

[0056] Further, the first lens group 1 has a negative focal power, the second lens group 2 has a positive focal power, and the third lens group 3 has a negative focal power.

[0057] The plurality of lens groups constitute three mirror groups, and the optical power of each mirror group can be adjusted according to the use requirement. In the embodiment, the optical power of the first lens group 1 is specifically negative, the optical power of the second lens group 2 is specifically positive, and the optical power of the third lens group 3 is specifically negative, so as to ensure the normal work of the zoom lens 100.

[0058] In the present application, the zoom lens 100 has a specific embodiment, and in the embodiment, the parameters of each lens are as follows:

[0059]

[0060]

[0061]

[0062] Among them, the aspheric coefficients of each surface of each non-spherical lens are as follows:

[0063]

[0064]

[0065] The present application also provides a photographic equipment comprising the zoom lens 100 of any one of the above embodiments. The photographic equipment can be a monitoring camera, a highway speed camera, etc., which often needs to take pictures in dark environment, and is therefore very suitable for using the zoom lens 100 provided by the present application.

[0066] The above description is only the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like within the concept of the present application, using the content of the present application specification and drawings, are all included in the patent protection scope of the present application.

Claims

1. A zoom lens having an object side and an image side arranged opposite each other along the extension direction of the optical axis, characterized in that, The zoom lens includes a plurality of lenses arranged sequentially from the object side to the image side. The plurality of lenses respectively form a first lens group, a second lens group, and a third lens group. The lenses in the first lens group are respectively a first lens, a second lens, a third lens, and a fourth lens arranged sequentially from the object side to the image side. The lenses in the second lens group are respectively a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged sequentially from the object side to the image side. The lenses in the third lens group are respectively a twelfth lens, a thirteenth lens, and a fourteenth lens arranged sequentially from the object side to the image side. At least a portion of the plurality of lenses are aspherical lenses. Wherein, the optical power of the fifth lens is positive, the optical power of the sixth lens is positive, 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 negative, and the optical power of the eleventh lens is positive. The zoom lens also includes a lens barrel; the first lens group and the second lens group, which are closer to the object side, are movably disposed in the lens barrel along the extension direction of the optical axis to maintain the zoom capability of the zoom lens; the third lens group, which is closer to the image side, is fixedly installed in the lens barrel to stably reduce the aberration of the zoom lens.

2. The zoom lens as described in claim 1, characterized in that, The zoom lens also includes a variable aperture disposed between the first lens group and the second lens group; During its operation, the distance between the first lens group and the variable aperture is not less than 1.177 mm and not greater than 19.787 mm, so as to adjust the F-number of the zoom lens to less than 1.2 together with the variable aperture.

3. The zoom lens as described in claim 1, characterized in that, The zoom lens also includes a variable aperture disposed between the first lens group and the second lens group; The distance between the second lens group and the variable aperture during its operation is greater than or equal to 0.615 mm and less than or equal to 11.324 mm.

4. The zoom lens as described in claim 1, characterized in that, Two of the plurality of lenses form a complementary lens group, wherein one of the two lenses in each complementary lens group is made of crown glass and the other is made of flint glass.

5. The zoom lens as described in claim 4, characterized in that, The third lens and the fourth lens form a complementary lens group; and / or, The fifth lens and the sixth lens form a complementary lens group; and / or, The seventh lens and the eighth lens form a complementary lens group; and / or, The tenth lens and the eleventh lens form a complementary lens group; and / or, The thirteenth lens and the fourteenth lens together form a complementary lens group.

6. The zoom lens as described in claim 1, characterized in that, The second lens, the fifth lens, the eleventh lens, and the fourteenth lens are aspherical lenses.

7. The zoom lens as described in claim 1, characterized in that, The zoom lens also includes optical adhesive: The optical adhesive bonds the third lens to the fourth lens; and / or, The optical adhesive bonds the seventh lens to the eighth lens; and / or The optical adhesive is used to bond the ninth lens and the tenth lens.

8. The zoom lens as described in claim 1, characterized in that, The optical power of the first lens group is negative, the optical power of the second lens group is positive, and the optical power of the third lens group is negative.

9. A photographic device, characterized in that, Includes the zoom lens as described in any one of claims 1 to 8.

Images