CN218497255U - Zoom lens - Google Patents
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- CN218497255U CN218497255U CN202123280464.7U CN202123280464U CN218497255U CN 218497255 U CN218497255 U CN 218497255U CN 202123280464 U CN202123280464 U CN 202123280464U CN 218497255 U CN218497255 U CN 218497255U
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Abstract
The embodiment of the utility model discloses a zoom lens, this zoom lens include along the optical axis from the object space to the image space in proper order arranged have positive focal power fixed lens group, have negative focal power first zoom lens group, have positive focal power second zoom lens group and have positive focal power compensation lens group; the fixed lens group comprises a first lens, the first variable power lens group comprises a second lens, a third lens and a fourth lens which are sequentially arranged from an object side to an image side along an optical axis, the second variable power 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 which are sequentially arranged from the object side to the image side along the optical axis, and the compensation lens group comprises a twelfth lens, a thirteenth lens and a fourteenth lens which are sequentially arranged from the object side to the image side along the optical axis. The embodiment of the utility model provides a zoom lens has invariable big diaphragm of super wide angle and full burnt Duan Gongwai confocal ability.
Description
Technical Field
The embodiment of the utility model provides a relate to camera lens technical field, especially relate to a zoom lens.
Background
The zoom lens is applicable to various monitoring scenes due to the fact that the focal length of the zoom lens is variable, and is increasingly popular in the security monitoring market. The zoom lens can be divided into a constant aperture and a non-constant aperture according to the aperture type; the zoom lens can be divided into a wide zoom and a telephoto zoom according to the angle. In the prior art, the maximum angle of the constant-aperture zoom lens is usually less than 76 degrees, and the monitoring range is not wide enough; the ultra-wide-angle zoom lens with the maximum angle of more than 130 degrees has larger aperture difference of different focal sections, so that the image brightness of different focal sections has obvious difference.
In recent years, the concept of starlight with an ultra-large aperture is gradually recognized in the field of security protection. In the era of networking and digitalization, the pursuit of high definition in monitoring makes the requirement of a camera for the light flux higher and higher. Generally speaking, the larger the light flux, the better the low illumination performance, the higher the signal-to-noise ratio, and the better the imaging effect, however, the infrared supplementary lighting imaging still needs to be used in the all-black environment, and therefore the lens is required to have the infrared confocal capability. However, lenses with technical parameters such as ultra-wide-angle zooming, nearly constant aperture, F1.0 infrared confocal and the like in the market do not appear yet.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a zoom lens to a invariable big light ring of super wide angle (F1.0 ~ F1.2), the confocal zoom lens of full focus Duan Gongwai are provided.
An embodiment of the present invention provides a zoom lens, which includes a fixed lens group having positive focal power, a first zoom lens group having negative focal power, a second zoom lens group having positive focal power, and a compensation lens group having positive focal power, which are sequentially arranged from an object side to an image side along an optical axis, wherein the first zoom lens group and the second zoom lens group can reciprocate along the optical axis;
the fixed lens group comprises a first lens, the first variable power lens group comprises a second lens, a third lens and a fourth lens which are sequentially arranged from an object side to an image side along an optical axis, the second variable power 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 which are sequentially arranged from the object side to the image side along the optical axis, and the compensation lens group comprises a twelfth lens, a thirteenth lens and a fourteenth lens which are sequentially arranged from the object side to the image side along the optical axis.
Optionally, the focal power G of the fixed lens group and the focal power B of the compensation lens group satisfy: G/B is more than or equal to 0.2 and less than or equal to 2.5;
the focal power Z1 of the first variable power lens group and the focal power B of the compensation lens group meet the following conditions: the absolute value of Z1/B is more than or equal to 3 and less than or equal to 30;
the focal power Z2 of the second variable power lens group and the focal power B of the compensation lens group meet the following conditions: the absolute value of Z2/B is more than or equal to 2 and less than or equal to 25.
Optionally, the first lens has a positive optical power, the second lens has a negative optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, the fifth lens has a positive optical power, the sixth lens has a negative optical power, the seventh lens has a negative optical power, the eighth lens has a positive optical power, the ninth lens has a negative optical power, the tenth lens has a positive optical power, the eleventh lens has a negative optical power, the twelfth lens has a positive optical power, the thirteenth lens has a positive optical power, and the fourteenth lens has a negative optical power.
Optionally, the focal power of the second lens is phi 2, the focal power of the third lens is phi 3, the focal power of the fourth lens is phi 4, the focal power of the fifth lens is phi 5, the focal power of the sixth lens is phi 6, the focal power of the seventh lens is phi 7, the focal power of the eighth lens is phi 8, the focal power of the ninth lens is phi 9, the focal power of the tenth lens is phi 10, the focal power of the eleventh lens is phi 11, the focal power of the twelfth lens is phi 12, the focal power of the thirteenth lens is phi 13, the focal power of the fourteenth lens is phi 14, the focal power of the first variable power lens group is Z1, the focal power of the second variable power lens group is Z2, and the focal power of the compensation lens group is B;
wherein optical powers of the second lens to the fourteenth lens satisfy the following condition:
0.3≤|φ2/Z1|≤2.1；0.3≤|φ3/Z1|≤2.0，0.15≤|φ4/Z1|≤1.5；
0.15≤|φ5/Z2|≤1.5；0.05≤|φ6/Z2|≤0.8；0.08≤|φ7/Z2|≤1；
0.35≤|φ8/Z2|≤2.5；0.25≤|φ9/Z2|≤2.2；0.4≤|φ10/Z2|≤3.9；
0.05≤|φ11/Z2|≤0.85；0.8≤|φ12/B|≤5.5；3.5≤|φ13/B|≤55；
4≤|φ14/B|≤45。
optionally, the refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6, the refractive index of the seventh lens is n7, the refractive index of the eighth lens is n8, the refractive index of the ninth lens is n9, the refractive index of the tenth lens is n10, the refractive index of the eleventh lens is n11, the refractive index of the twelfth lens is n12, the refractive index of the thirteenth lens is n13, and the refractive index of the fourteenth lens is n14;
wherein refractive indices of the first to fourteenth lenses satisfy the following condition:
1.6≤n1≤2.15；1.58≤n2≤1.95；1.43≤n3≤1.75；1.71≤n4≤2.15；
1.4≤n5≤1.75；1.55≤n6≤1.95；1.55≤n7≤1.95；1.4≤n8≤1.75；
1.65≤n9≤2.15；1.4≤n10≤1.75；1.7≤n11≤2.15；1.65≤n12≤2.15；
1.7≤n13≤2.15；1.65≤n14≤2.1。
optionally, the seventh lens and the eighth lens form a double cemented lens, the ninth lens, the tenth lens and the eleventh lens form a triple cemented lens, and the thirteenth lens and the fourteenth lens form a double cemented lens.
Optionally, the first lens, the second lens, the fourth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the thirteenth lens, and the fourteenth lens are all spherical lenses, and the third lens, the fifth lens, and the twelfth lens are all aspheric lenses.
Optionally, an aperture of the zoom lens satisfies: fw-Ft are more than or equal to 0.9 and less than or equal to 1.4;
where Fw denotes an aperture of the zoom lens at the wide angle end, and Ft denotes an aperture of the zoom lens at the telephoto end.
Optionally, the field angle of the zoom lens satisfies: FOV-w is not more than 90 degrees; FOV-t is less than or equal to 65 degrees;
wherein FOV-w represents the angle of view of the zoom lens at the wide angle end, and FOV-t represents the angle of view of the zoom lens at the telephoto end.
Optionally, the image plane diameter IC of the zoom lens and the total lens length TTL of the zoom lens satisfy: IC/TTL is more than or equal to 0.02 and less than or equal to 1.2.
The embodiment of the utility model provides a zoom lens, through first variable power lens group and second variable power lens group along optical axis reciprocating motion realization camera lens zoom, and through the focal power of the lens quantity that each lens group of reasonable setting included and each lens group, the correctable aberration that can be better, guarantee the clarity of image under the different focal length states, make zoom lens have invariable big light ring of super wide angle (F1.0 ~ F1.2) and full focus Duan Gongwai confocal ability, and zoom lens has the maximum angle more than 135 at wide-angle end, applicable 1/1.8 "big target surface sensitization chip, satisfy-40 ℃ -80 ℃ service condition.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it should be apparent that the drawings in the following description are some specific embodiments of the present invention, and it is obvious for those skilled in the art that the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested according to the various embodiments of the present invention can be extended and extended to other structures and drawings, which should not be undoubted to be within the scope of the claims of the present invention.
Fig. 1 is a schematic structural diagram of a zoom lens according to a first embodiment of the present invention at a wide-angle end;
fig. 2 is a schematic structural diagram of a zoom lens at a telephoto end according to a first embodiment of the present invention;
fig. 3 is a spherical aberration curve diagram of a zoom lens according to a first embodiment of the present invention at a wide-angle end;
fig. 4 is a light fan diagram at the wide-angle end of the zoom lens according to the first embodiment of the present invention;
fig. 5 is a schematic view of a zoom lens according to a first embodiment of the present invention at a wide-angle end;
fig. 6 is a field curvature distortion diagram of a zoom lens according to a first embodiment of the present invention at a wide-angle end;
fig. 7 is a spherical aberration curve diagram of the zoom lens at the telephoto end according to the first embodiment of the present invention;
fig. 8 is a light fan diagram at a telephoto end of the zoom lens according to the first embodiment of the present invention;
fig. 9 is a point diagram of a zoom lens at a telephoto end according to a first embodiment of the present invention;
fig. 10 is a field curvature distortion diagram of a zoom lens at a telephoto end according to a first embodiment of the present invention;
fig. 11 is a schematic structural view of a zoom lens according to a second embodiment of the present invention at a wide-angle end;
fig. 12 is a schematic structural view of a zoom lens at a telephoto end according to the second embodiment of the present invention;
fig. 13 is a spherical aberration curve diagram of a zoom lens according to the second embodiment of the present invention at a wide-angle end;
fig. 14 is a light fan diagram at the wide-angle end of the zoom lens according to the second embodiment of the present invention;
fig. 15 is a dot-column diagram of the zoom lens according to the second embodiment of the present invention at the wide-angle end;
fig. 16 is a curvature of field distortion diagram of a zoom lens according to a second embodiment of the present invention at a wide-angle end;
fig. 17 is a spherical aberration curve diagram of the zoom lens provided by the second embodiment of the present invention at the telephoto end;
fig. 18 is a light fan diagram at the telephoto end of the zoom lens according to the second embodiment of the present invention;
fig. 19 is a point diagram of the zoom lens at the telephoto end according to the second embodiment of the present invention;
fig. 20 is a field curvature distortion diagram of a zoom lens according to a second embodiment of the present invention;
fig. 21 is a schematic structural view of a zoom lens according to a third embodiment of the present invention at a wide-angle end;
fig. 22 is a schematic structural view of a zoom lens according to a third embodiment of the present invention at a telephoto end;
fig. 23 is a spherical aberration curve diagram of the zoom lens according to the third embodiment of the present invention at the wide-angle end;
fig. 24 is a light fan diagram at the wide-angle end of the zoom lens according to the third embodiment of the present invention;
fig. 25 is a dot-column diagram of a zoom lens according to a third embodiment of the present invention at a wide-angle end;
fig. 26 is a curvature of field distortion diagram of a zoom lens according to a third embodiment of the present invention at a wide-angle end;
fig. 27 is a spherical aberration curve diagram of the zoom lens provided by the third embodiment of the present invention at the telephoto end;
fig. 28 is a light fan diagram at a telephoto end of the zoom lens according to the third embodiment of the present invention;
fig. 29 is a point diagram of a zoom lens at a telephoto end according to the third embodiment of the present invention;
fig. 30 is a field curvature distortion diagram of the zoom lens at the telephoto end according to the third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described clearly and completely through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art based on the basic concepts disclosed and suggested by the embodiments of the present invention belong to the protection scope of the present invention.
Example one
Fig. 1 is a schematic structural view of a zoom lens provided by a first embodiment of the present invention at a wide-angle end, fig. 2 is a schematic structural view of a zoom lens provided by a first embodiment of the present invention at a telephoto end, referring to fig. 1 and fig. 2, the first embodiment of the present invention provides a zoom lens comprising a fixed lens group 100 having positive focal power, a first variable power lens group 200 having negative focal power, a second variable power lens group 300 having positive focal power, and a compensation lens group 400 having positive focal power, which are sequentially arranged from an object space to an image space along an optical axis, wherein the first variable power lens group 200 and the second variable power lens group 300 can reciprocate along the optical axis; the fixed lens group 100 includes a first lens 1, the first variable power lens group 200 includes a second lens 2, a third lens 3, and a fourth lens 4 sequentially arranged from an object side to an image side along an optical axis, the second variable power lens group 300 includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, and an eleventh lens 11 sequentially arranged from the object side to the image side along the optical axis, and the compensation lens group 400 includes a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14 sequentially arranged from the object side to the image side along the optical axis.
Exemplarily, referring to fig. 1 and 2, a zoom lens provided by an embodiment of the present invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14, which are sequentially arranged from an object side to an image side along an optical axis. The first lens 1 serves as a fixed lens group 100 for converging external light. The second lens 2, the third lens 3 and the fourth lens 4 form a first variable power lens group 200, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens and the 10 eleventh lens 11 form a second variable power lens group 300, and the first variable power lens group 200 and the second variable power lens group 300 can both move along an optical axis, so that the focal length of the zoom lens can be continuously changed from a wide angle to a long focus, the zoom lens is guaranteed to have high image quality at each focal position, and meanwhile the zoom lens can be miniaturized. The twelfth lens 12, the thirteenth lens 13 and the fourteenth lens 14 form a compensation lens group 400, and the compensation lens group 400 is disposed behind the second variable power lens group 40 and is used for compensating various aberrations formed in an imaging process. The embodiment of the present invention may dispose the fixed lens group 100, the first zoom lens group 200, the second zoom lens group 300, and the compensation lens group 400 in one lens barrel (not shown in fig. 1 and 2). In addition, the zoom lens may further include a stop 500, where the stop 500 is located in an optical path between the first variable power lens group 200 and the second variable power lens group 300, and the stop 500 may adjust a propagation direction of a light beam, which is beneficial to improving imaging quality.
It is to be understood that, in the zoom lens system, when the focal length is shortest, that is, the zoom lens is located at the wide angle end, and when the focal length is longest, that is, the zoom lens is located at the telephoto end, in the process of zooming by moving the first variable power lens group 200 and the second variable power lens group 300, the zoom lens has different focal lengths and powers, and also has different lengths or forms at the wide angle end and the telephoto end.
Further, the focal power is the reciprocal of the focal length, characterizing the ability of the optical system to deflect light rays. The larger the absolute value of the focal power is, the stronger the bending ability to the light ray is, and the smaller the absolute value of the focal power is, the weaker the bending ability to the light ray is. When the focal power is positive, the refraction of the light is convergent; when the focal power is negative, the refraction of the light is divergent. The focal power can be used for characterizing a certain lens and can also be used for characterizing a system formed by a plurality of lenses together, namely a lens group. In the embodiment, the fixed lens group 100 has positive focal power, the first variable power lens group 200 has negative focal power, the second variable power lens group 300 has positive focal power, and the compensation lens group 400 has positive focal power, so that the focal powers of the fixed lens group 100, the first variable power lens group 200, the second variable power lens group 300 and the compensation lens group 400 are matched with each other, aberrations caused in the zooming movement process of the first variable power lens group 200 and the second variable power lens group 300 can be compensated, and the images in different focal length states are clear.
The embodiment of the utility model provides a zoom lens, through first variable power lens group and second variable power lens group along optical axis reciprocating motion realization camera lens zoom, and through the focal power of lens quantity and each lens group that reasonable setting each lens group includes, the correction aberration that can be better, guarantee the clarity of image under the different focal length states, make zoom lens have the invariable big light ring of super wide angle (F1.0 ~ F1.2) and full focus Duan Gongwai confocal ability, and zoom lens has the maximum angle more than 135 at wide-angle end, applicable 1/1.8 "big target surface sensitization chip, satisfy the service condition of-40 ℃ -80 ℃.
Referring to fig. 1 and 2, on the basis of the above embodiment, optionally, the power G of the fixed lens group 100 and the power B of the compensation lens group 400 satisfy: G/B is more than or equal to 0.2 and less than or equal to 2.5; the focal power Z1 of the first variable power lens group 200 and the focal power B of the compensation lens group 400 satisfy: the absolute value of Z1/B is more than or equal to 3 and less than or equal to 30; the focal power Z2 of the second variable power lens group 300 and the focal power B of the compensation lens group 400 satisfy: the absolute value of Z2/B is more than or equal to 2 and less than or equal to 25.
The confocal zoom lens of the ultra-wide angle constant large aperture (F1.0-F1.2) and the full focus Duan Gongwai can be realized by reasonably setting the power proportion relation of the fixed lens group 100, the first zoom lens group 200, the second zoom lens group 300 and the compensation lens group 400 and enabling the fixed lens group, the first zoom lens group, the second zoom lens group and the compensation lens group to be matched with each other.
Alternatively, the first lens 1 has a positive power, the second lens 2 has a negative power, the third lens 3 has a negative power, the fourth lens 4 has a positive power, the fifth lens 5 has a positive power, the sixth lens 6 has a negative power, the seventh lens 7 has a negative power, the eighth lens 8 has a positive power, the ninth lens 9 has a negative power, the tenth lens 10 has a positive power, the eleventh lens 11 has a negative power, the twelfth lens 12 has a positive power, the thirteenth lens 13 has a positive power, and the fourteenth lens 14 has a negative power.
Through reasonably matching focal powers of all the lenses, aberration can be better corrected, virtual focus is not generated within the temperature range of-40-80 ℃, and the confocal zoom lens with the ultra-wide angle, the constant large aperture (F1.0-F1.2) and the full focus Duan Gongwai is realized.
Alternatively, the focal power of the second lens 2 is phi 2, the focal power of the third lens 3 is phi 3, the focal power of the fourth lens 4 is phi 4, the focal power of the fifth lens 5 is phi 5, the focal power of the sixth lens 6 is phi 6, the focal power of the seventh lens 7 is phi 7, the focal power of the eighth lens 8 is phi 8, the focal power of the ninth lens 9 is phi 9, the focal power of the tenth lens 10 is phi 10, the focal power of the eleventh lens 11 is phi 11, the focal power of the twelfth lens 12 is phi 12, the focal power of the thirteenth lens 13 is phi 13, the focal power of the fourteenth lens 14 is phi 14, the focal power of the first variable power lens group 200 is Z1, the focal power of the second variable power lens group 300 is Z2, and the focal power of the compensation lens group 400 is B; wherein the focal powers of the second lens 2 to the fourteenth lens 14 satisfy the following conditions:
0.3≤|φ2/Z1|≤2.1；0.3≤|φ3/Z1|≤2.0，0.15≤|φ4/Z1|≤1.5；
0.15≤|φ5/Z2|≤1.5；0.05≤|φ6/Z2|≤0.8；0.08≤|φ7/Z2|≤1；
0.35≤|φ8/Z2|≤2.5；0.25≤|φ9/Z2|≤2.2；0.4≤|φ10/Z2|≤3.9；
0.05≤|φ11/Z2|≤0.85；0.8≤|φ12/B|≤5.5；3.5≤|φ13/B|≤55；
4≤|φ14/B|≤45。
the embodiment of the utility model provides a through rationally setting up each lens in each lens group and the focal power proportional relation who corresponds the lens group, be favorable to better correction aberration, guarantee the clarity of different focus state images down.
As a possible embodiment, the refractive index of the first lens 1 is n1, the refractive index of the second lens 2 is n2, the refractive index of the third lens 3 is n3, the refractive index of the fourth lens 4 is n4, the refractive index of the fifth lens 5 is n5, the refractive index of the sixth lens 6 is n6, the refractive index of the seventh lens 7 is n7, the refractive index of the eighth lens 8 is n8, the refractive index of the ninth lens 9 is n9, the refractive index of the tenth lens 10 is n10, the refractive index of the eleventh lens 11 is n11, the refractive index of the twelfth lens 12 is n12, the refractive index of the thirteenth lens 13 is n13, and the refractive index of the fourteenth lens 14 is n14; wherein the refractive indices of the first lens 1 to the fourteenth lens 14 satisfy the following conditions:
1.6≤n1≤2.15；1.58≤n2≤1.95；1.43≤n3≤1.75；1.71≤n4≤2.15；
1.4≤n5≤1.75；1.55≤n6≤1.95；1.55≤n7≤1.95；1.4≤n8≤1.75；
1.65≤n9≤2.15；1.4≤n10≤1.75；1.7≤n11≤2.15；1.65≤n12≤2.15；
1.7≤n13≤2.15；1.65≤n14≤2.1。
the refractive index is the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium, and is mainly used for describing the refractive power of materials to light, and the refractive indexes of different materials are different. The embodiment of the utility model provides a through the refracting index of each lens of collocation setting zoom, be favorable to realizing the miniaturized design of zoom; meanwhile, the method is favorable for realizing higher pixel resolution and larger aperture.
Referring to fig. 1 and 2, alternatively, the seventh lens 7 and the eighth lens 8 constitute a double cemented lens, the ninth lens 9, the tenth lens 10, and the eleventh lens 11 constitute a triple cemented lens, and the thirteenth lens 13 and the fourteenth lens 14 constitute a double cemented lens.
The air interval between the lenses can be effectively reduced through the gluing of the lenses, so that the total length of the lens is reduced, the overall structure of the zoom lens is compact, and the miniaturization requirement is met. In addition, the cemented lens is favorable for eliminating chromatic aberration, so that various aberrations of the zoom lens can be fully corrected, the resolution can be improved, and the optical performances such as distortion, CRA and the like can be optimized on the premise of compact structure; and the light quantity loss caused by reflection between the lenses can be reduced, and the illumination is improved, so that the image quality is improved, and the imaging definition of the lens is improved. In addition, the use of the cemented lens can also reduce the number of assembling parts between the two lenses, simplify the assembly procedure in the lens manufacturing process, reduce the cost, and reduce the tolerance sensitivity problems of the lens unit such as inclination/decentration generated in the assembling process.
Referring to fig. 1 and 2, alternatively, the first lens 1, the second lens 2, the fourth lens 4, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, the thirteenth lens 13, and the fourteenth lens 14 are all spherical lenses. The third lens 3, the fifth lens 5, and the twelfth lens 12 are all aspheric lenses.
In particular, the spherical lens has the characteristic of constant curvature from the center of the lens to the periphery of the lens, and the simple arrangement mode of the lens is ensured. Aspherical lenses are characterized by a continuous change in curvature from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved. In the embodiment, a part of lenses in the zoom lens is set as spherical lenses, a part of lenses is set as aspherical lenses, and the spherical lenses and the aspherical lenses are matched with each other, so that the imaging quality of the zoom lens can be improved, and the setting mode of the zoom lens is simplified.
Furthermore, the material of each lens in the zoom lens can be set according to actual requirements. Illustratively, the first lens 1, the second lens 2, the fourth lens 4, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, the thirteenth lens 13, and the fourteenth lens 14 may all be glass spherical lenses, and the third lens 3, the fifth lens 5, and the twelfth lens 12 may all be plastic aspherical lenses. The glass spherical lens is easy to process, the cost of the plastic lens is far lower than that of the glass lens, and the cost of the fixed-focus lens can be effectively controlled while the optical performance of the fixed-focus lens is ensured by adopting a mode of mixing and matching the glass lens and the plastic lens; meanwhile, the materials of the lenses have the mutual compensation effect, so that the lenses can still be normally used in high and low temperature environments. It is understood that the third lens 3, the fifth lens 5 and the twelfth lens 12 may be glass aspheric lenses in other embodiments.
Wherein, the material of plastic aspheric lens can be various plastics that technical staff in the field can know, and the material of glass spherical lens is various types of glass that technical staff in the field can know, the embodiment of the utility model discloses it does not give unnecessary detail nor does the restriction to this.
Optionally, the aperture of the zoom lens satisfies: fw-Ft are more than or equal to 0.9 and less than or equal to 1.4; where Fw denotes a stop of the zoom lens at the wide angle end, and Ft denotes a stop of the zoom lens at the telephoto end.
The embodiment of the utility model provides a zoom is the zoom of the invariable big light ring of super wide angle (F1.0 ~ F1.2), and this zoom reaches 0.9 ~ 1.4 at the light ring Fw at wide-angle end and the light ring Ft at the telephoto end, satisfies super large light throughput, can satisfy the control demand under the low light intensity condition.
Optionally, the field angle of the zoom lens satisfies: FOV-w is not more than 90 degrees; FOV-t is less than or equal to 65 degrees; wherein FOV-w denotes an angle of view of the zoom lens at the wide angle end, and FOV-t denotes an angle of view of the zoom lens at the telephoto end.
The embodiment of the utility model provides a zoom has great angle of vision, can reach the angle of vision more than 90 at wide-angle end, further still can reach the maximum angle more than 135, can reach the angle of vision more than 60 at the telephoto end, satisfies the requirement of big field of vision. Optionally, the image plane diameter IC of the zoom lens and the total lens length TTL of the zoom lens satisfy: IC/TTL is more than or equal to 0.02 and less than or equal to 1.2.
The effective Image surface diameter of the zoom lens is IC (Image circle), the distance from the optical axis center of the object side surface of the first lens 1 to the Image surface is total optical length TTL, the Image surface requirement is met by reasonably setting the relation between the Image surface diameter and the total lens length, the total lens length of the optical lens is reduced, the miniaturization of the zoom lens is realized, and the later-stage assembly is facilitated.
To sum up, the embodiment of the present invention provides a zoom lens, which provides a super wide-angle constant large aperture (F1.0-F1.2) and a full focus Duan Gongwai confocal zoom lens by reasonably distributing focal power, wherein the wide-angle end has a maximum angle above 135 °, and is applicable to 1/1.8 ″ large target surface photosensitive chip, which satisfies the use condition of-40 ℃ -80 ℃, and realizes a zoom lens with super wide-angle, constant large aperture, large target surface and small volume.
Table 1 illustrates specific optical physical parameters of each lens in the zoom lens provided by the first embodiment of the present invention in a feasible implementation manner, where the zoom lens in table 1 corresponds to the zoom lens shown in fig. 1 and fig. 2.
TABLE 1 optical physical parameters of the first to fourteenth lenses
| Number of noodles | Surface type | Radius of curvature | Thickness of | Material (nd) | Material (vd) | Coefficient of |
| 1 | Spherical surface | 39.352 | 2.586 | 1.91 | 22.67 | |
| 2 | Spherical surface | 56.057 | |
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| 3 | Spherical surface | 56.909 | 0.95 | 1.73 | 55 | |
| 4 | Spherical surface | 9.964 | 7.146 | |||
| 5 | Aspherical surface | -19.516 | 0.732 | 1.59 | 60.47 | 2.132 |
| 6 | Aspherical surface | 22.368 | 0.097 | -14.124 | ||
| 7 | Spherical surface | 22.456 | 4.648 | 1.95 | 17.75 | |
| 8 | Spherical surface | 179.768 | |
|||
| STO | PL | INF | |
|||
| 10 | Aspherical surface | 60.951 | 2 | 1.62 | 63 | 45.032 |
| 11 | Aspherical surface | -30.535 | 1.624 | -7.817 | ||
| 12 | Spherical surface | -12.381 | 1.869 | 1.80 | 47.66 | |
| 13 | Spherical surface | -17.391 | 0.058 | |||
| 14 | Spherical surface | 35.382 | 0.768 | 1.65 | 41.72 | |
| 15 | Spherical surface | 16.433 | 6.699 | 1.59 | 67.75 | |
| 16 | Spherical surface | -16.509 | 0.118 | |||
| 17 | Spherical surface | 28.985 | 0.947 | 1.81 | 26 | |
| 18 | Spherical surface | 10.569 | 6.22 | 1.59 | 68.62 | |
| 19 | Spherical surface | -15.185 | 1.111 | 2 | 28.29 | |
| 20 | Spherical surface | -28.27 | |
|||
| 21 | Aspherical surface | 35.863 | 1.512 | 1.86 | 41.64 | -39.157 |
| 22 | Aspherical surface | 131.359 | 0.063 | 8.872 | ||
| 23 | Spherical surface | 21.814 | 3.535 | 1.99 | 16.83 | |
| 24 | Spherical surface | -15.022 | 0.748 | 1.85 | 23.1 | |
| 25 | Spherical surface | 11.659 |
The surface numbers in table 1 are numbered in accordance with the order of the surfaces of the respective lenses, for example, "1" represents the object plane surface of the first lens 1, "2" represents the image plane surface of the first lens 1, "3" represents the object plane surface of the second lens 2, "4" represents the image plane surface of the second lens 2, and so on. Here, "15" is a cemented surface of the seventh lens 7 and the eighth lens 8, "18" is a cemented surface of the ninth lens 9 and the tenth lens 10, "19" is a cemented surface of the tenth lens 10 and the eleventh lens 11, and "24" is a cemented surface of the thirteenth lens 13 and the fourteenth lens 14. The curvature radius represents the bending degree of the lens surface, a positive value represents that the surface is bent to the image surface side, a negative value represents that the surface is bent to the object surface side, wherein 'PL' represents that the surface is a plane, and the curvature radius is infinite; thickness represents the central axial distance from the current surface to the next surface, and the radius of curvature and thickness are both in millimeters (mm); the material (nd) is a refractive index which represents the deflection capability of the material between the current surface and the next surface to light, the blank space represents that the current position is air, and the refractive index is 1; the material (vd) is a dispersion coefficient representing the dispersion characteristic of the material between the current surface and the next surface to light, and the blank space represents that the current position is air; the K value represents the numerical value of the best fitting cone coefficient of the aspheric surface; STO stands for diaphragm.
Table 2 shows a design value of the variable pitch in table 1:
TABLE 2 design values of variable pitches of zoom lenses at wide angle end and telephoto end
| Wide angle end | Long focal length | |
| Variable pitch | ||
| 1 | 0.735 | 11.45 |
| |
11.78 | 1.07 |
| |
6.81 | 1.19 |
| |
0.8 | 5.05 |
The aspheric surface shape equation z satisfies:
wherein Z represents the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of y along the optical axis direction; c =1/R, R representing the paraxial radius of curvature of the mirror surface; k is a conic coefficient; A. b, C, D, E, F denotes high order aspheric coefficients.
Table 3 shows aspheric coefficients of the lenses of the zoom lens according to the embodiment of the present invention:
TABLE 3 design values of aspherical coefficients of respective lenses in zoom lens
| Number of noodles | A | B | C | D | E | F |
| 5 | -2.118E-5 | 8.551E-7 | -1.507E-8 | 1.383E-10 | 2.024 |
0 |
| 6 | 8.638E-5 | -6.376E-7 | -2.839E-9 | 9.554E-11 | -7.832E-15 | 0 |
| 10 | -1.006E-4 | -1.661E-7 | -7.062E-9 | 1.245E-10 | -2.501E-12 | 1.561E-15 |
| 11 | -1.128E-5 | 6.584E-7 | 4.344E-10 | 7.722E-11 | 4.026E-14 | 1.496E-15 |
| 21 | 7.544E-5 | -2.01E-6 | 5.678E-8 | -4.12E-10 | -1.656E-13 | -2.14E-15 |
| 22 | 9.41E-6 | -6.616E-7 | 5.023E-8 | -4.305E-10 | -1.9E-13 | -9.765E-16 |
wherein-2.118E-5 indicates that the coefficient A with the face number of 5 is-2.118 x 10 -5 And so on.
The embodiment of the utility model provides a zoom lens has reached following technical index:
TABLE 4 technical index of zoom lens
| Wide angle end | Long coke end | |
| Aperture | 0.999 | 1.19 |
| Focal length | 4.65 | 10.14 |
| Angle of view | 136° | 52° |
Fig. 3 is a spherical aberration curve diagram of the zoom lens at the wide-angle end according to the first embodiment of the present invention, as shown in fig. 3, the spherical aberration of the zoom lens at different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm and 0.850 μm) is within 0.036mm, and the curves at different wavelengths are relatively concentrated, which illustrates that the axial aberration of the zoom lens is relatively small, so that it can be known that the zoom lens according to the first embodiment of the present invention can better correct the aberration at the wide-angle end.
Fig. 4 is a light fan diagram of the zoom lens at the wide-angle end according to the first embodiment of the present invention, as shown in fig. 4, imaging ranges of light rays with different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) at different angles of view of the zoom lens are all within 20 μm and curves are very concentrated, so that it is ensured that aberrations of different fields of view are small, that is, it is illustrated that the zoom lens corrects aberrations of the optical system at the wide-angle end well.
Fig. 5 is a point diagram of a zoom lens according to a first embodiment of the present invention at a wide-angle end, where the point diagram is one of the most common evaluation methods in modern optical design. The point diagram is that after many light rays emitted by a point light source pass through an optical system, intersection points of the light rays and an image surface are not concentrated on the same point any more due to aberration, and a diffusion pattern scattered in a certain range is formed. As shown in fig. 5, in the zoom lens provided in the embodiments of the present invention, the dispersion patterns of the light beams with different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) under each field of view are relatively concentrated and distributed relatively uniformly, and the dispersion patterns under a certain field of view are not separated from each other up and down along with the wavelength, which indicates that there is no visible purple fringe. Meanwhile, the root mean square radius values (RMS radii) of the light rays (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm and 0.850 μm) with different wavelengths at each field position of the zoom lens are respectively 1.371 μm, 2.854 μm, 1.587 μm, 3.173 μm, 3.051 μm and 3.556 μm, which shows that the RMS radii of each field are less than 4 μm, namely that the zoom lens has lower chromatic aberration and aberration at the wide angle end, solves the purple edge problem of imaging of each waveband, and can realize high-resolution imaging.
Fig. 6 is a curvature of field distortion diagram of a zoom lens according to a first embodiment of the present invention at a wide-angle end, as shown in fig. 6, in a left side coordinate system, a horizontal coordinate represents a size of curvature of field, and a unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents arc loss; as can be seen from fig. 6, the zoom lens provided by the present embodiment is effectively controlled in curvature of field from light with a wavelength of 435nm to light with a wavelength of 850nm, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right side, the horizontal coordinate represents the magnitude of the distortion in units of%; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 6, the distortion of the zoom lens provided by the present embodiment at the wide-angle end is better corrected, the imaging distortion is smaller, and the requirement of low distortion is satisfied.
Fig. 7 is a spherical aberration curve diagram of the zoom lens at the telephoto end according to the first embodiment of the present invention, as shown in fig. 7, the spherical aberration of the zoom lens at different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) is within 0.05mm, and the curves at different wavelengths are relatively concentrated, which indicates that the axial aberration of the zoom lens is small, and thus, the zoom lens provided by the embodiment of the present invention can better correct the aberration at the telephoto end.
Fig. 8 is a light fan diagram at the telephoto end of the zoom lens according to the first embodiment of the present invention, as shown in fig. 8, imaging ranges of light with different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) at different angles of view of the zoom lens are all within 20 μm and curves are very concentrated, so that it is ensured that aberrations of different field regions are small, that is, it is said that the aberration of the optical system is well corrected at the telephoto end of the zoom lens.
Fig. 9 is a dot-column diagram of the zoom lens at the telephoto end according to an embodiment of the present invention, as shown in fig. 9, in the zoom lens according to an embodiment of the present invention, the dispersion patterns of the light beams with different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) under each field of view are relatively concentrated and distributed relatively uniformly, and the dispersion patterns under a certain field of view are not separated from each other up and down along with the wavelength, which indicates that there is no obvious purple edge. Meanwhile, the root mean square radius values (RMS radii) of light rays (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm and 0.850 μm) with different wavelengths at each field position of the zoom lens are 2.167 μm, 2.288 μm, 2.242 μm, 2.308 μm, 2.436 μm and 3.171 μm respectively, which shows that the RMS radii of each field are less than 4 μm, namely that the zoom lens has lower chromatic aberration and aberration at the telephoto end, solves the purple edge problem of imaging of each waveband, and can realize high-resolution imaging.
Fig. 10 is a field curvature distortion diagram of the zoom lens at the telephoto end according to the first embodiment of the present invention, as shown in fig. 10, in the left coordinate system, the horizontal coordinate represents the size of the field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents arc loss; as can be seen from fig. 10, the zoom lens provided by this embodiment is effectively controlled in curvature of field from light with a wavelength of 435nm to light with a wavelength of 850nm, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 10, the distortion of the telephoto end of the zoom lens provided by the present embodiment is better corrected, the imaging distortion is smaller, and the requirement of low distortion is met.
Example two
Fig. 11 is a schematic structural diagram of a zoom lens provided by the second embodiment of the present invention at a wide-angle end, fig. 12 is a schematic structural diagram of a zoom lens provided by the second embodiment of the present invention at a telephoto end, referring to fig. 11 and fig. 12, the zoom lens provided by the second embodiment of the present invention includes a fixed lens group 100 having positive refractive power, a first variable power lens group 200 having negative refractive power, a second variable power lens group 300 having positive refractive power, and a compensation lens group 400 having positive refractive power, which are sequentially arranged from an object space to an image space along an optical axis, and the first variable power lens group 200 and the second variable power lens group 300 can reciprocate along the optical axis; the fixed lens group 100 includes a first lens 1, the first variable power lens group 200 includes a second lens 2, a third lens 3, and a fourth lens 4 sequentially arranged from an object side to an image side along an optical axis, the second variable power lens group 300 includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, and an eleventh lens 11 sequentially arranged from the object side to the image side along the optical axis, and the compensation lens group 400 includes a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14 sequentially arranged from the object side to the image side along the optical axis. The first lens 1 has a positive power, the second lens 2 has a negative power, the third lens 3 has a negative power, the fourth lens 4 has a positive power, the fifth lens 5 has a positive power, the sixth lens 6 has a negative power, the seventh lens 7 has a negative power, the eighth lens 8 has a positive power, the ninth lens 9 has a negative power, the tenth lens 10 has a positive power, the eleventh lens 11 has a negative power, the twelfth lens 12 has a positive power, the thirteenth lens 13 has a positive power, and the fourteenth lens 14 has a negative power. The seventh lens 7 and the eighth lens 8 form a double cemented lens, the ninth lens 9, the tenth lens 10, and the eleventh lens 11 form a triple cemented lens, and the thirteenth lens 13 and the fourteenth lens 14 form a double cemented lens. A stop 500 is located in the optical path between the first variable magnification lens group 200 and the second variable magnification lens group 300.
Table 5 illustrates specific optical physical parameters of each lens in the zoom lens provided by embodiment two of the present invention in a feasible implementation manner, where the zoom lens in table 5 corresponds to the zoom lenses shown in fig. 11 and 12.
TABLE 5 optical physical parameters of the first to fourteenth lenses
| Number of noodles | Surface type | Radius of curvature | Thickness of | Material (nd) | Material (vd) | Coefficient of |
| 1 | Spherical surface | 36.268 | 2.586 | 1.97 | 28 | |
| 2 | Spherical surface | 51.031 | |
|||
| 3 | Spherical surface | 54.504 | 0.95 | 1.79 | 61.9 | |
| 4 | Spherical surface | 10.027 | 7.126 | |||
| 5 | Aspherical surface | -19.646 | 0.622 | 1.58 | 55 | 2.161 |
| 6 | Aspherical surface | 22.663 | 0.142 | -14.215 | ||
| 7 | Spherical surface | 22.438 | 4.606 | 1.95 | 17.8 | |
| 8 | Spherical surface | 187.703 | |
|||
| STO | PL | INF | |
|||
| 10 | Aspherical surface | 60.664 | 2.118 | 1.62 | 54.4 | 45.293 |
| 11 | Aspherical surface | -30.244 | 1.563 | -7.846 | ||
| 12 | Spherical surface | -12.4 | 1.886 | 1.84 | 49.2 | |
| 13 | Spherical surface | -17.359 | 0.05 | |||
| 14 | Spherical surface | 35.283 | 0.625 | 1.65 | 42.4 | |
| 15 | Spherical surface | 16.425 | 6.637 | 1.59 | 66.8 | |
| 16 | Spherical surface | -16.513 | 0.13 | |||
| 17 | Spherical surface | 28.821 | 0.993 | 1.85 | 25.9 | |
| 18 | Spherical surface | 10.614 | 6.33 | 1.59 | 70.3 | |
| 19 | Spherical surface | -15.222 | 1.147 | 2 | 27.3 | |
| 20 | Spherical surface | -28.173 | |
|||
| 21 | Aspherical surface | 35.477 | 1.558 | 1.87 | 32.2 | -38.095 |
| 22 | Aspherical surface | 133.060 | 0.065 | 5.201 | ||
| 23 | Spherical surface | 21.763 | 3.565 | 1.99 | 17.1 | |
| 24 | Spherical surface | -14.751 | 0.771 | 1.84 | 22.7 | |
| 25 | Spherical surface | 11.685 |
The surface numbers in table 5 are numbered in accordance with the order of the surfaces of the respective lenses, for example, "1" represents the object plane surface of the first lens 1, "2" represents the image plane surface of the first lens 1, and so on. Here, "15" is a cemented surface of the seventh lens 7 and the eighth lens 8, "18" is a cemented surface of the ninth lens 9 and the tenth lens 10, "19" is a cemented surface of the tenth lens 10 and the eleventh lens 11, and "24" is a cemented surface of the thirteenth lens 13 and the fourteenth lens 14. The curvature radius represents the bending degree of the lens surface, a positive value represents that the surface is bent to the image surface side, a negative value represents that the surface is bent to the object surface side, wherein 'PL' represents that the surface is a plane, and the curvature radius is infinite; thickness represents the central axial distance from the current surface to the next surface, and the radius of curvature and thickness are both in millimeters (mm); the material (nd) is a refractive index which represents the deflection capability of the material between the current surface and the next surface to light, the blank space represents that the current position is air, and the refractive index is 1; the material (vd) is a dispersion coefficient representing the dispersion characteristic of the material between the current surface and the next surface to light, and the blank space represents that the current position is air; the K value represents the numerical value of the best fitting cone coefficient of the aspheric surface; STO stands for diaphragm.
Table 6 shows a design value of the variable pitch in table 5:
TABLE 6 design values of variable pitches of zoom lenses at wide-angle end and telephoto end
| Wide angle end | Long focal length | |
| Variable pitch | ||
| 1 | 0.855 | 11.37 |
| |
11.79 | 1.28 |
| |
6.94 | 1.29 |
| |
0.86 | 5.04 |
The aspheric surface shape equation z satisfies:
wherein, Z represents the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of y along the optical axis direction; c =1/R, R representing the paraxial radius of curvature of the mirror surface; k is a conic coefficient; A. b, C, D, E, F denotes high-order aspheric coefficients.
Table 7 shows aspheric coefficients of each lens in the zoom lens provided in embodiment two of the present invention:
TABLE 7 design values of aspherical coefficients of respective lenses in zoom lens
| Number of noodles | A | B | C | D | E | F |
| 5 | -2.091E-5 | 8.054E-7 | -1.561E-8 | 1.393E-10 | 7.63E-14 | 0 |
| 6 | 8.507E-5 | -6.866E-7 | -3.062E-9 | 1.009E-10 | 2.433E-14 | 0 |
| 10 | -1.000E-4 | -1.652E-7 | -7.058E-9 | 1.235E-10 | -2.100E-12 | 4.796E-15 |
| 11 | -1.118E-5 | 6.61E-7 | 4.532E-10 | 7.952E-11 | 6.468E-14 | 3.158E-15 |
| 21 | 7.817E-5 | -1.989E-6 | 5.680E-8 | -4.232E-10 | -2.213E-13 | -5.223E-15 |
| 22 | 9.168E-6 | -6.555E-7 | 5.015E-8 | -4.352E-10 | -4.505E-13 | -3.953E-15 |
wherein-2.091E-5 indicates that the coefficient A with the face number of 5 is-2.091 x 10 -5 And so on.
The embodiment of the utility model provides a second zoom lens has reached following technical index:
TABLE 8 technical indices of zoom lens
| Wide angle end | Long focal length end | |
| Aperture of light | 1.05 | 1.2 |
| Focal length | 4.65 | 10.16 |
| Angle of view | 135° | 53° |
Fig. 13 is a spherical aberration curve diagram of the zoom lens according to the second embodiment of the present invention at the wide-angle end, as shown in fig. 13, the spherical aberration of the zoom lens at different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) is within 0.036mm, and different wavelength curves are relatively concentrated, which illustrates that the axial aberration of the zoom lens is relatively small, so that it can be known that the zoom lens according to the second embodiment of the present invention can better correct the aberration at the wide-angle end.
Fig. 14 is a ray fan diagram of the zoom lens according to the second embodiment of the present invention at the wide-angle end, and as shown in fig. 14, imaging ranges of different wavelengths of light (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) at different angles of view of the zoom lens are all within 20 μm and curves are very concentrated, so that it is ensured that aberrations of different fields of view are small, that is, it is explained that the zoom lens corrects aberrations of the optical system at the wide-angle end well.
Fig. 15 is a point diagram of a zoom lens according to a second embodiment of the present invention at the wide-angle end, where the point diagram is one of the most common evaluation methods in modern optical design. The point diagram is that after many light rays emitted by a point light source pass through an optical system, intersection points of the light rays and an image surface are not concentrated on the same point any more due to aberration, and a diffusion pattern scattered in a certain range is formed. As shown in fig. 15, in the zoom lens provided in the embodiment of the present invention, the dispersion patterns of the light beams with different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) under each field of view are relatively concentrated and distributed relatively uniformly, and the dispersion patterns under a certain field of view are not separated from each other up and down along with the wavelength, which indicates that there is no visible purple fringe. Meanwhile, the root mean square radius values (RMS radii) of the light rays (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm and 0.850 μm) with different wavelengths at each field position of the zoom lens are respectively 1.494 μm, 2.590 μm, 1.948 μm, 1.621 μm, 1.950 μm and 2.192 μm, which shows that the RMS radii of each field are all smaller than 3 μm, namely that the zoom lens has lower chromatic aberration and aberration at the wide-angle end, solves the purple edge problem of imaging of each waveband, and can realize imaging with high resolution.
Fig. 16 is a field curvature distortion diagram of the zoom lens according to the second embodiment of the present invention at the wide-angle end, as shown in fig. 16, in the left coordinate system, the horizontal coordinate represents the size of field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents arc loss; as can be seen from fig. 6, the zoom lens provided by the present embodiment is effectively controlled in curvature of field from light with a wavelength of 435nm to light with a wavelength of 850nm, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 6, the distortion of the zoom lens provided by the present embodiment at the wide-angle end is better corrected, the imaging distortion is smaller, and the requirement of low distortion is satisfied.
Fig. 17 is a spherical aberration curve diagram of the zoom lens at the telephoto end according to the second embodiment of the present invention, as shown in fig. 17, the spherical aberration of the zoom lens at different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) is within 0.036mm, the curves at different wavelengths are relatively concentrated, which indicates that the axial aberration of the zoom lens is small, and thus, the zoom lens provided by the embodiment of the present invention can better correct the aberration at the telephoto end.
Fig. 18 is a light fan diagram at the telephoto end of the zoom lens according to the second embodiment of the present invention, as shown in fig. 18, imaging ranges of different wavelengths of light (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) at different angles of view of the zoom lens are all within 20 μm and curves are very concentrated, so that it is ensured that aberrations of different field regions are small, that is, it is said that the aberration of the optical system is well corrected at the telephoto end of the zoom lens.
Fig. 19 is a dot-column diagram of the zoom lens at the telephoto end according to the second embodiment of the present invention, as shown in fig. 19, in the zoom lens according to the embodiment of the present invention, the diffusion patterns of the light beams with different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) under each field of view are relatively concentrated and distributed relatively uniformly, and the diffusion patterns under a certain field of view are not separated from each other up and down along with the wavelength, which indicates that there is no obvious purple edge. Meanwhile, the root mean square radius values (RMS radii) of light rays (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm and 0.850 μm) with different wavelengths at each field position of the zoom lens are 1.798 μm, 1.871 μm, 2.229 μm, 2.457 μm, 2.565 μm and 3.414 μm respectively, which shows that the RMS radii of each field are less than 4 μm, namely that the zoom lens has lower chromatic aberration and aberration at the telephoto end, solves the purple edge problem of imaging of each waveband, and can realize high-resolution imaging.
Fig. 20 is a distortion diagram of field curvature at the telephoto end of the zoom lens according to the second embodiment of the present invention, as shown in fig. 20, in a left coordinate system, a horizontal coordinate represents the size of field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents arc loss; as can be seen from fig. 20, the zoom lens provided by the present embodiment is effectively controlled in curvature of field from light with a wavelength of 435nm to light with a wavelength of 850nm, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 20, the distortion of the telephoto end of the zoom lens provided by the embodiment is better corrected, the imaging distortion is smaller, and the requirement of low distortion is met.
EXAMPLE III
Fig. 21 is a schematic structural view of a zoom lens provided by the third embodiment of the present invention at a wide-angle end, fig. 22 is a schematic structural view of a zoom lens provided by the third embodiment of the present invention at a telephoto end, referring to fig. 21 and fig. 22, the zoom lens provided by the third embodiment of the present invention includes a fixed lens group 100 having positive refractive power, a first variable power lens group 200 having negative refractive power, a second variable power lens group 300 having positive refractive power, and a compensation lens group 400 having positive refractive power, which are sequentially arranged from an object space to an image space along an optical axis, and the first variable power lens group 200 and the second variable power lens group 300 can reciprocate along the optical axis; the fixed lens group 100 includes a first lens 1, the first variable power lens group 200 includes a second lens 2, a third lens 3, and a fourth lens 4 sequentially arranged from an object side to an image side along an optical axis, the second variable power lens group 300 includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, and an eleventh lens 11 sequentially arranged from the object side to the image side along the optical axis, and the compensation lens group 400 includes a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14 sequentially arranged from the object side to the image side along the optical axis. The first lens 1 has a positive power, the second lens 2 has a negative power, the third lens 3 has a negative power, the fourth lens 4 has a positive power, the fifth lens 5 has a positive power, the sixth lens 6 has a negative power, the seventh lens 7 has a negative power, the eighth lens 8 has a positive power, the ninth lens 9 has a negative power, the tenth lens 10 has a positive power, the eleventh lens 11 has a negative power, the twelfth lens 12 has a positive power, the thirteenth lens 13 has a positive power, and the fourteenth lens 14 has a negative power. Among them, the seventh lens 7 and the eighth lens 8 constitute a double cemented lens, the ninth lens 9, the tenth lens 10, and the eleventh lens 11 constitute a triple cemented lens, and the thirteenth lens 13 and the fourteenth lens 14 constitute a double cemented lens. A stop 500 is located in the optical path between the first variable magnification lens group 200 and the second variable magnification lens group 300.
Table 9 illustrates specific optical physical parameters of each lens in the zoom lens provided by the third embodiment of the present invention in a possible implementation manner, where the zoom lens in table 9 corresponds to the zoom lens shown in fig. 21 and fig. 22.
TABLE 9 optical physical parameters of the first to fourteenth lenses
| Noodle sequence number | Surface type | Radius of curvature | Thickness of | Material (nd) | Material (vd) | Coefficient of |
| 1 | Spherical surface | 36.737 | 2.586 | 1.86 | 27.2 | |
| 2 | Spherical surface | 52.021 | |
|||
| 3 | Spherical surface | 55.471 | 0.95 | 1.73 | 56 | |
| 4 | Spherical surface | 9.861 | 7.453 | |||
| 5 | Aspherical surface | -19.547 | 0.576 | 1.59 | 72.7 | 2.379 |
| 6 | Aspherical surface | 22.331 | 0.156 | -14.219 | ||
| 7 | Spherical surface | 22.513 | 4.679 | 1.95 | 20.4 | |
| 8 | Spherical surface | 187.703 | |
|||
| STO | PL | INF | |
|||
| 10 | Aspherical surface | 60.786 | 2.234 | 1.61 | 61.9 | 44.945 |
| 11 | Aspherical surface | -30.147 | 1.651 | -8.778 | ||
| 12 | Spherical surface | -12.306 | 1.87 | 1.6 | 44 | |
| 13 | Spherical surface | -17.454 | 0.098 | |||
| 14 | Spherical surface | 35.273 | 0.701 | 1.66 | 40 | |
| 15 | Spherical surface | 16.263 | 6.689 | 1.59 | 65.6 | |
| 16 | Spherical surface | -16.535 | 0.086 | |||
| 17 | Spherical surface | 28.876 | 0.985 | 1.85 | 26 | |
| 18 | Spherical surface | 10.559 | 6.102 | 1.59 | 60.1 | |
| 19 | Spherical surface | -15.316 | 0.5 | 2 | 25.9 | |
| 20 | Spherical surface | -28.063 | |
|||
| 21 | Aspherical surface | 35.61 | 1.5 | 1.84 | 36.7 | -38.897 |
| 22 | Aspherical surface | 152.019 | 0.046 | 0.455 | ||
| 23 | Spherical surface | 22.528 | 3.519 | 1.99 | 17.4 | |
| 24 | Spherical surface | -15.152 | 0.75 | 1.85 | 22.9 | |
| 25 | Spherical surface | 11.643 |
The surface numbers in table 9 are numbered in accordance with the surface order of the respective lenses, for example, "1" represents the object surface of the first lens 1, "2" represents the image surface of the first lens 1, and so on. Here, "15" is a cemented surface of the seventh lens 7 and the eighth lens 8, "18" is a cemented surface of the ninth lens 9 and the tenth lens 10, "19" is a cemented surface of the tenth lens 10 and the eleventh lens 11, and "24" is a cemented surface of the thirteenth lens 13 and the fourteenth lens 14. The curvature radius represents the bending degree of the lens surface, a positive value represents that the surface is bent to the image surface side, a negative value represents that the surface is bent to the object surface side, wherein 'PL' represents that the surface is a plane, and the curvature radius is infinite; thickness represents the central axial distance from the current surface to the next surface, and the radius of curvature and thickness are both in millimeters (mm); the material (nd) is a refractive index which represents the deflection capability of the material between the current surface and the next surface to light, the blank space represents that the current position is air, and the refractive index is 1; the material (vd) is a dispersion coefficient representing the dispersion characteristic of the material between the current surface and the next surface to light, and the blank space represents that the current position is air; the K value represents the numerical value of the best fitting cone coefficient of the aspheric surface; STO stands for diaphragm.
Table 10 shows a design value of the variable pitch in table 9:
TABLE 10 design values of variable pitches of zoom lenses at wide-angle end and telephoto end
| Wide angle end | Long coke end | |
| |
0.5 | 11.45 |
| |
11.79 | 0.83 |
| |
7 | 1.47 |
| |
0.77 | 4.95 |
The aspheric surface shape equation z satisfies:
wherein Z represents the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of y along the optical axis direction; c =1/R, R representing the paraxial radius of curvature of the mirror surface; k is a conic coefficient; A. b, C, D, E, F denotes high-order aspheric coefficients.
Table 11 is the present invention provides a zoom lens system in which aspheric coefficients of the lenses are:
TABLE 11 design values of aspherical coefficients of respective lenses in zoom lens
| Number of noodles | A | B | C | D | E | F |
| 5 | -2.035E-5 | 8.625E-7 | -1.608E-8 | 1.493E-10 | 1.102 |
0 |
| 6 | 8.332E-5 | -7.115E-7 | -3.879E-9 | 1.118E-10 | 5.484E-14 | 0 |
| 10 | -1.024E-4 | -1.859E-7 | -6.990E-9 | 1.235E-10 | -1.965E-12 | 7.521E-15 |
| 11 | -1.048E-5 | 6.374E-7 | 3.106E-10 | 7.767E-11 | 5.367E-14 | 4.681E-15 |
| 21 | 7.966E-5 | -1.993E-6 | 5.688E-8 | -4.139E-10 | -1.456E-13 | -7.53E-16 |
| 22 | 9.000E-6 | -6.529E-7 | 4.998E-8 | -4.389E-10 | -2.623E-13 | -1.231E-15 |
wherein-2.035E-5 indicates that the coefficient A with the face number of 5 is-2.035X 10 -5 And so on.
The embodiment of the utility model provides a zoom lens that three provide has reached following technical index:
TABLE 12 technical index of zoom lens
| Wide angle end | Long coke end | |
| Aperture | 1.07 | 1.19 |
| Focal length | 4.65 | 10.14 |
| Angle of view | 135° | 52° |
Fig. 23 is a spherical aberration curve diagram of the zoom lens provided by the third embodiment of the present invention at the wide-angle end, as shown in fig. 23, the spherical aberration of the zoom lens at different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm and 0.850 μm) is within 0.027mm, and the curves at different wavelengths are relatively concentrated, which indicates that the axial aberration of the zoom lens is small, so that it can be known that the zoom lens provided by the third embodiment of the present invention can better correct the aberration at the wide-angle end.
Fig. 24 is a ray fan diagram at the wide-angle end of the zoom lens according to the third embodiment of the present invention, as shown in fig. 24, imaging ranges of different wavelengths of light (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) at different angles of view of the zoom lens are all within 20 μm and curves are very concentrated, so as to ensure that aberrations of different fields of view are small, that is, it is described that the zoom lens corrects aberrations of the optical system at the wide-angle end well.
Fig. 25 is a point diagram of a zoom lens according to a third embodiment of the present invention at the wide-angle end, where the point diagram is one of the most common evaluation methods in modern optical design. The point diagram is that after many light rays emitted by a point light source pass through an optical system, intersection points of the light rays and an image surface are not concentrated on the same point any more due to aberration, and a diffusion pattern scattered in a certain range is formed. As shown in fig. 25, in the zoom lens provided in the embodiment of the present invention, the dispersion patterns of the light beams with different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) under each field of view are relatively concentrated and distributed relatively uniformly, and the dispersion patterns under a certain field of view are not separated from each other up and down along with the wavelength, which indicates that there is no visible purple fringe. Meanwhile, the root mean square radius values (RMS radii) of light rays (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm and 0.850 μm) with different wavelengths at each field position of the zoom lens are respectively 1.070 μm, 2.751 μm, 1.553 μm, 2.370 μm, 2.902 μm and 3.026 μm, which shows that the RMS radii of each field are all smaller than 4 μm, namely that the zoom lens has lower chromatic aberration and aberration at the wide-angle end, solves the purple edge problem of imaging of each waveband, and can realize high-resolution imaging.
Fig. 26 is a distortion diagram of field curvature at the wide-angle end of the zoom lens according to the third embodiment of the present invention, as shown in fig. 26, in the left coordinate system, the horizontal coordinate represents the size of field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents arc loss; as can be seen from fig. 26, the zoom lens provided by the present embodiment is effectively controlled in curvature of field from light with a wavelength of 435nm to light with a wavelength of 850nm, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 26, the distortion of the zoom lens provided by the present embodiment at the wide-angle end is better corrected, the imaging distortion is smaller, and the requirement of low distortion is satisfied.
Fig. 27 is a spherical aberration curve diagram of the zoom lens at the telephoto end according to the third embodiment of the present invention, as shown in fig. 27, the spherical aberration of the zoom lens at different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) is all within 0.035mm, and the curves at different wavelengths are relatively concentrated, which indicates that the axial aberration of the zoom lens is small, and thus it can be known that the zoom lens provided by the third embodiment of the present invention can better correct the aberration at the telephoto end.
Fig. 28 is a light fan diagram at the telephoto end of the zoom lens according to the third embodiment of the present invention, as shown in fig. 28, imaging ranges of different wavelengths of light (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) at different angles of view of the zoom lens are all within 20 μm and curves are very concentrated, so that it is ensured that aberrations of different fields of view are small, that is, it is illustrated that the aberration of the optical system is better corrected by the zoom lens at the telephoto end.
Fig. 29 is a dot-column diagram of the zoom lens at the telephoto end according to the third embodiment of the present invention, as shown in fig. 29, in the zoom lens according to the embodiment of the present invention, the dispersion patterns of the light beams with different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) under each field of view are relatively concentrated and distributed relatively uniformly, and the dispersion patterns under a certain field of view are not separated from each other up and down along with the wavelength, which indicates that there is no obvious purple edge. Meanwhile, the root mean square radius values (RMS radii) of light rays (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm and 0.850 μm) with different wavelengths at each field position of the zoom lens are respectively 1.455 μm, 1.572 μm, 2.004 μm, 2.245 μm, 2.396 μm and 3.349 μm, which shows that the RMS radii of each field are all smaller than 4 μm, namely that the zoom lens has lower chromatic aberration and aberration at the telephoto end, solves the purple edge problem of imaging of each waveband, and can realize high-resolution imaging.
Fig. 30 is a distortion diagram of field curvature at the telephoto end of the zoom lens according to the third embodiment of the present invention, as shown in fig. 30, in the left coordinate system, the horizontal coordinate represents the size of field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents arc loss; as can be seen from fig. 30, the zoom lens provided by the present embodiment is effectively controlled in curvature of field from light with a wavelength of 435nm to light with a wavelength of 850nm, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 30, the distortion of the telephoto end of the zoom lens provided by the present embodiment is better corrected, the imaging distortion is smaller, and the requirement of low distortion is satisfied.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A zoom lens comprising, arranged in order from an object side to an image side along an optical axis, a fixed lens group having positive power, a first variable power lens group having negative power, a second variable power lens group having positive power, and a compensation lens group having positive power, the first variable power lens group and the second variable power lens group being reciprocally movable along the optical axis;
the fixed lens group comprises a first lens, the first variable power lens group comprises a second lens, a third lens and a fourth lens which are sequentially arranged from an object side to an image side along an optical axis, the second variable power 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 which are sequentially arranged from the object side to the image side along the optical axis, and the compensation lens group comprises a twelfth lens, a thirteenth lens and a fourteenth lens which are sequentially arranged from the object side to the image side along the optical axis.
2. The zoom lens according to claim 1,
the focal power G of the fixed lens group and the focal power B of the compensation lens group meet the following conditions: G/B is more than or equal to 0.2 and less than or equal to 2.5;
the focal power Z1 of the first variable power lens group and the focal power B of the compensation lens group meet the following conditions: the absolute value of Z1/B is more than or equal to 3 and less than or equal to 30;
the focal power Z2 of the second variable power lens group and the focal power B of the compensation lens group meet the following conditions: the absolute value of Z2/B is more than or equal to 2 and less than or equal to 25.
3. The zoom lens according to claim 1, wherein the first lens has a positive optical power, the second lens has a negative optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, the fifth lens has a positive optical power, the sixth lens has a negative optical power, the seventh lens has a negative optical power, the eighth lens has a positive optical power, the ninth lens has a negative optical power, the tenth lens has a positive optical power, the eleventh lens has a negative optical power, the twelfth lens has a positive optical power, the thirteenth lens has a positive optical power, and the fourteenth lens has a negative optical power.
4. The zoom lens according to claim 1, wherein an optical power of the second lens is Φ 2, an optical power of the third lens is Φ 3, an optical power of the fourth lens is Φ 4, an optical power of the fifth lens is Φ 5, an optical power of the sixth lens is Φ 6, an optical power of the seventh lens is Φ 7, an optical power of the eighth lens is Φ 8, an optical power of the ninth lens is Φ 9, an optical power of the tenth lens is Φ 10, an optical power of the eleventh lens is Φ 11, an optical power of the twelfth lens is Φ 12, an optical power of the thirteenth lens is Φ 13, an optical power of the fourteenth lens is Φ 14, an optical power of the first variable power lens group is Z1, an optical power of the second variable power lens group is Z2, and an optical power of the compensation lens group is B;
wherein optical powers of the second lens to the fourteenth lens satisfy the following condition:
0.3≤|φ2/Z1|≤2.1；0.3≤|φ3/Z1|≤2.0，0.15≤|φ4/Z1|≤1.5；
0.15≤|φ5/Z2|≤1.5；0.05≤|φ6/Z2|≤0.8；0.08≤|φ7/Z2|≤1；
0.35≤|φ8/Z2|≤2.5；0.25≤|φ9/Z2|≤2.2；0.4≤|φ10/Z2|≤3.9；
0.05≤|φ11/Z2|≤0.85；0.8≤|φ12/B|≤5.5；3.5≤|φ13/B|≤55；
4≤|φ14/B|≤45。
5. the zoom lens according to claim 1, wherein a refractive index of the first lens is n1, a refractive index of the second lens is n2, a refractive index of the third lens is n3, a refractive index of the fourth lens is n4, a refractive index of the fifth lens is n5, a refractive index of the sixth lens is n6, a refractive index of the seventh lens is n7, a refractive index of the eighth lens is n8, a refractive index of the ninth lens is n9, a refractive index of the tenth lens is n10, a refractive index of the eleventh lens is n11, a refractive index of the twelfth lens is n12, a refractive index of the thirteenth lens is n13, and a refractive index of the fourteenth lens is n14;
wherein refractive indices of the first to fourteenth lenses satisfy the following condition:
1.6≤n1≤2.15；1.58≤n2≤1.95；1.43≤n3≤1.75；1.71≤n4≤2.15；
1.4≤n5≤1.75；1.55≤n6≤1.95；1.55≤n7≤1.95；1.4≤n8≤1.75；
1.65≤n9≤2.15；1.4≤n10≤1.75；1.7≤n11≤2.15；1.65≤n12≤2.15；
1.7≤n13≤2.15；1.65≤n14≤2.1。
6. the zoom lens according to claim 1, wherein the seventh lens and the eighth lens constitute a cemented doublet, the ninth lens, the tenth lens and the eleventh lens constitute a cemented triplet, and the thirteenth lens and the fourteenth lens constitute a cemented doublet.
7. The zoom lens according to claim 1, wherein the first lens, the second lens, the fourth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the thirteenth lens, and the fourteenth lens are all spherical lenses, and the third lens, the fifth lens, and the twelfth lens are all aspherical lenses.
8. The zoom lens according to claim 1, wherein an aperture of the zoom lens satisfies: fw-Ft are more than or equal to 0.9 and less than or equal to 1.4;
where Fw denotes an aperture of the zoom lens at the wide angle end, and Ft denotes an aperture of the zoom lens at the telephoto end.
9. The zoom lens according to claim 1, wherein a field angle of the zoom lens satisfies: FOV-w is more than or equal to 90 degrees; FOV-t is less than or equal to 65 degrees;
wherein FOV-w represents the angle of view of the zoom lens at the wide angle end, and FOV-t represents the angle of view of the zoom lens at the telephoto end.
10. The zoom lens according to claim 1, wherein an image plane diameter IC of the zoom lens and a total lens length TTL of the zoom lens satisfy: IC/TTL is more than or equal to 0.02 and less than or equal to 1.2.
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| CN202123280464.7U CN218497255U (en) | 2021-12-24 | 2021-12-24 | Zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123280464.7U CN218497255U (en) | 2021-12-24 | 2021-12-24 | Zoom lens |
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| CN218497255U true CN218497255U (en) | 2023-02-17 |
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