CN110082894B - Zoom lens - Google Patents
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- CN110082894B CN110082894B CN201910374750.8A CN201910374750A CN110082894B CN 110082894 B CN110082894 B CN 110082894B CN 201910374750 A CN201910374750 A CN 201910374750A CN 110082894 B CN110082894 B CN 110082894B
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- 238000003384 imaging method Methods 0.000 claims abstract description 39
- 230000003287 optical effect Effects 0.000 claims description 33
- 239000006185 dispersion Substances 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000004075 alteration Effects 0.000 description 24
- 239000000463 material Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 239000005357 flat glass Substances 0.000 description 7
- 235000005811 Viola adunca Nutrition 0.000 description 6
- 240000009038 Viola odorata Species 0.000 description 6
- 235000013487 Viola odorata Nutrition 0.000 description 6
- 235000002254 Viola papilionacea Nutrition 0.000 description 6
- 230000014509 gene expression Effects 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 5
- 238000012634 optical imaging Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010226 confocal imaging Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/15—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation
Abstract
The invention relates to the technical field of lenses. The invention discloses a zoom lens, which is provided with twelve lenses, wherein the first lens to the fourth lens form a compensation lens group, and the fifth lens to the twelfth lens form a zoom lens group; the diaphragm is arranged between the compensation lens group and the variable magnification lens group, the refractive index and the surface area of the first lens to the twelfth lens are correspondingly limited, the third lens and the fourth lens form a cemented lens, the sixth lens and the seventh lens form a cemented lens, the eleventh lens and the twelfth lens form a cemented lens, and the object side surfaces and the image side surfaces of the first lens to the twelfth lens are spherical surfaces. The invention has the advantages of large light transmission, minimum aperture value up to 1.5, small numerical difference from short focus to long Jiao Guangjuan, good control of transmission function, high resolution and imaging quality and low cost.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to a zoom lens.
Background
With the continuous progress of technology, in recent years, an optical imaging lens is also rapidly developed, and the optical imaging lens is widely applied to various fields of smart phones, tablet computers, video conferences, security monitoring and the like.
The zoom lens is a camera lens capable of changing focal length within a certain range, thereby obtaining images with different sizes and different scenery ranges with different wide and narrow angles of view. The zoom lens can change the shooting range by changing the focal length without changing the shooting distance, so that the use is very convenient.
However, the zoom lens of small magnification (generally, less than 4 times) on the market has the following defects: the zoom lens with larger light transmission uses at least one aspheric lens, so that the cost is higher; the difference of the aperture values is large from the shortest focal length to the longest focal length, for example, the aperture value FNO is 1.6 at the shortest focal length and reaches 3.0 at the longest focal length; although some have a large light transmission, the imaging quality is relatively low.
Disclosure of Invention
The present invention is directed to a zoom lens for solving the above-mentioned problems.
In order to achieve the above purpose, the invention adopts the following technical scheme: the zoom lens sequentially comprises a first lens, a fourth lens, a diaphragm, a fifth lens and a twelfth lens from an object side to an image side along an optical axis; the first lens element to the twelfth lens element each comprise an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens has negative refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative refractive index, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has negative refractive index, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface; the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the image side surface of the third lens is glued with the object side surface of the fourth lens; the first lens to the fourth lens form a compensating lens group;
the fifth lens has positive refractive index, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens element has positive refractive index, wherein the object-side surface of the sixth lens element is convex, and the image-side surface of the sixth lens element is convex; the seventh lens has negative refractive index, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a plane; the eighth lens has positive refractive index, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface; the ninth lens has positive refractive index, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface; the tenth lens has negative refractive index, the object side surface of the tenth lens is a convex surface, and the image side surface of the tenth lens is a concave surface; the eleventh lens has positive refractive index, the object side surface of the eleventh lens is a convex surface, and the image side surface of the eleventh lens is a convex surface; the twelfth lens has negative refractive power, the object side surface of the twelfth lens is a concave surface, and the image side surface of the twelfth lens is a convex surface; the image side surface of the sixth lens is glued with the object side surface of the seventh lens; the image side surface of the eleventh lens is glued with the object side surface of the twelfth lens; the fifth lens to the twelfth lens form a variable magnification lens group;
the object side surface and the image side surface of the first lens element to the twelfth lens element are spherical, and the lens element with refractive index of the zoom lens has only twelve lens elements.
Further, the zoom lens further satisfies: 1.4< nd6<1.5, 80< vd6<95,1.8< nd7<1.9, 20< vd7<30, where nd6 and nd7 denote refractive indices of the sixth and seventh lenses, respectively, at d-line, and vd6 and vd7 denote dispersion coefficients of the sixth and seventh lenses, respectively, at d-line.
Further, the zoom lens further satisfies: 1.45< nd11<1.6, 50< vd11<80,1.8< nd12<2.1, 20< vd12<30, where nd11 and nd12 represent refractive indices of the eleventh and twelfth lenses, respectively, at d-line, and vd11 and vd12 represent dispersion coefficients of the eleventh and twelfth lenses, respectively, at d-line.
Further, the zoom lens further satisfies: 1.9< nd8<2, 16< vd8<20,1.9< nd9<2, 16< vd9<20, wherein nd8 and nd9 represent refractive indices of the eighth and ninth lenses, respectively, at d-line, and vd8 and vd9 represent dispersion coefficients of the eighth and ninth lenses, respectively, at d-line.
Further, the zoom lens further satisfies: 0.3< fw/BFLw <0.5, where fw is the shortest focal length and BFLw is the back focal length at the shortest focal length.
Further, the zoom lens further satisfies: 0.5< ft/BFLt <1, where ft is the longest focal length and BFLt is the back focal length at the longest focal length.
Further, the zoom lens further satisfies: TTL <75mm, wherein TTL is the distance from the object side surface to the imaging surface of the first lens on the optical axis.
The beneficial technical effects of the invention are as follows:
the invention can realize small multiple zooming, has the advantages of large light transmission, minimum aperture value reaching 1.5, small numerical difference from short focus to long Jiao Guangjuan (aperture value of 1.49 at the shortest focal length and aperture value of 2.2 at the longest focal length), good control of transfer function, high resolution and imaging quality and low cost.
In addition, the infrared confocal imaging device has good infrared confocal performance, and under the condition of visible light focusing, the imaging effect is still better when the infrared is switched to 850 nm; on the premise of infrared confocal, the chromatic aberration of the purple wavelength is ensured, and the blue-violet side is well controlled.
Drawings
FIG. 1 is a schematic view of a structure of a first embodiment of the present invention at a shortest focal length;
FIG. 2 is a schematic view of a structure of a first embodiment of the present invention at a longest focal length;
FIG. 3 is a graph of MTF at 0.435-0.656um at the shortest focal length according to an embodiment of the present invention;
FIG. 4 is a graph of MTF at 850nm for infrared at the shortest focal length according to an embodiment of the present invention;
FIG. 5 is a graph of MTF at 0.435-0.656um for a first embodiment of the invention at its longest focal length;
FIG. 6 is a graph of MTF at 850nm for infrared at the longest focal length according to one embodiment of the present invention;
FIG. 7 is a graph showing defocus curves for visible light at 0.435-0.656um at the shortest focal length according to the first embodiment of the present invention;
FIG. 8 is a graph of infrared 850nm defocus at the shortest focal length according to the first embodiment of the present invention;
FIG. 9 is a graph of defocus of 0.435-0.656um for visible light at the longest focal length according to the first embodiment of the present invention;
FIG. 10 is a graph showing the defocus at 850nm for infrared ray at the longest focal length according to the first embodiment of the present invention;
FIG. 11 is a diagram showing curvature of field and distortion at the shortest focal length according to the first embodiment of the present invention;
FIG. 12 is a diagram showing curvature of field and distortion at the longest focal length according to the first embodiment of the present invention;
FIG. 13 is a schematic view of a longitudinal chromatic aberration at a shortest focal length according to a first embodiment of the present invention;
FIG. 14 is a schematic view showing the longitudinal chromatic aberration at the longest focal length according to the first embodiment of the present invention;
FIG. 15 is a graph of MTF at 0.435-0.656um at the shortest focal length for embodiment two of the present invention;
FIG. 16 is a graph of MTF at 850nm for infrared at the shortest focal length for the second embodiment of the present invention;
FIG. 17 is a graph of MTF at 0.435-0.656um for the second embodiment of the invention at the longest focal length;
FIG. 18 is a graph of the MTF at 850nm of infrared at the longest focal length for the second embodiment of the present invention;
FIG. 19 is a graph showing defocus of visible light 0.435-0.656um at the shortest focal length for the second embodiment of the present invention;
FIG. 20 is a plot of infrared 850nm defocus at the shortest focal length for the second embodiment of the present invention;
FIG. 21 is a graph showing defocus of visible light 0.435-0.656um at the longest focal length for the second embodiment of the present invention;
FIG. 22 is a graph showing infrared 850nm defocus at the longest focal length for the second embodiment of the present invention;
FIG. 23 is a diagram showing curvature of field and distortion at the shortest focal length according to the second embodiment of the present invention;
FIG. 24 is a diagram showing curvature of field and distortion at the longest focal length according to a second embodiment of the present invention;
FIG. 25 is a schematic diagram showing a longitudinal chromatic aberration at the shortest focal length according to a second embodiment of the present invention;
FIG. 26 is a schematic diagram showing the longitudinal chromatic aberration at the longest focal length according to the second embodiment of the present invention;
FIG. 27 is a graph of MTF at 0.435-0.656um at the shortest focal length for example III of the present invention;
FIG. 28 is an MTF plot of infrared 850nm at the shortest focal length for example three of the present invention;
fig. 29 is a graph of MTF at 0.435-0.656um at the longest focal length for example three of the present invention;
FIG. 30 is a graph of the MTF at 850nm for infrared at the longest focal length for example III of the present invention;
FIG. 31 is a graph showing defocus curves for visible light at 0.435-0.656um for example III at the shortest focal length;
FIG. 32 is a plot of infrared 850nm defocus at the shortest focal length for embodiment three of the present invention;
FIG. 33 is a defocus plot of visible light 0.435-0.656um at the longest focal length for embodiment three of the present invention;
FIG. 34 is a plot of infrared 850nm defocus at the longest focal length of embodiment three of the present invention;
FIG. 35 is a graph showing curvature of field and distortion at the shortest focal length for a third embodiment of the present invention;
FIG. 36 is a graph showing curvature of field and distortion at the longest focal length for a third embodiment of the present invention;
FIG. 37 is a schematic view showing the longitudinal chromatic aberration at the shortest focal length according to the third embodiment of the present invention;
FIG. 38 is a schematic view showing the longitudinal chromatic aberration at the longest focal length according to the third embodiment of the present invention;
FIG. 39 is a graph of MTF at 0.435-0.656um at the shortest focal length for example IV of the present invention;
FIG. 40 is a graph of MTF at 850nm for infrared at the shortest focal length for example four of the present invention;
FIG. 41 is a graph of MTF at 0.435-0.656um for example IV at the longest focal length;
FIG. 42 is an MTF plot of infrared 850nm at the longest focal length for example four of the present invention;
FIG. 43 is a graph showing defocus of visible light 0.435-0.656um at the shortest focal length for example four of the present invention;
FIG. 44 is a plot of infrared 850nm defocus at the shortest focal length of example four of the present invention;
FIG. 45 is a graph showing defocus curves for visible light at 0.435-0.656um for the fourth embodiment of the present invention at the longest focal length;
FIG. 46 is a plot of infrared 850nm defocus at the longest focal length of example four of the present invention;
FIG. 47 is a graph showing curvature of field and distortion at the shortest focal length according to the fourth embodiment of the present invention;
FIG. 48 is a graph showing curvature of field and distortion at the longest focal length according to the fourth embodiment of the present invention;
FIG. 49 is a schematic view of a longitudinal chromatic aberration at the shortest focal length according to the fourth embodiment of the present invention;
FIG. 50 is a schematic view showing the longitudinal chromatic aberration at the longest focal length according to the fourth embodiment of the present invention;
FIG. 51 is a graph of MTF at 0.435-0.656um at the shortest focal length for embodiment five of the present invention;
FIG. 52 is a graph of MTF at 850nm for infrared at the shortest focal length for embodiment five of the present invention;
FIG. 53 is a graph of MTF at 0.435-0.656um for embodiment five at the longest focal length;
FIG. 54 is a graph of the MTF at 850nm for infrared at the longest focal length for embodiment five of the present invention;
FIG. 55 is a graph showing defocus of visible light 0.435-0.656um at the shortest focal length for fifth embodiment of the present invention;
FIG. 56 is a plot of infrared 850nm defocus at the shortest focal length of embodiment five of the present invention;
FIG. 57 is a graph showing defocus of visible light 0.435-0.656um at the longest focal length for embodiment five of the present invention;
FIG. 58 is a plot of infrared 850nm defocus at the longest focal length of embodiment five of the present invention;
FIG. 59 is a diagram showing curvature of field and distortion at the shortest focal length according to the fifth embodiment of the present invention;
FIG. 60 is a graph showing curvature of field and distortion at the longest focal length for fifth embodiment of the present invention;
FIG. 61 is a schematic view of a fifth embodiment of the present invention showing a longitudinal chromatic aberration at the shortest focal length;
FIG. 62 is a schematic view of a longitudinal chromatic aberration at the longest focal length according to a fifth embodiment of the present invention;
fig. 63 is a table of values of various important parameters according to five embodiments of the present invention.
Detailed Description
The invention will now be further described with reference to the drawings and detailed description.
The term "a lens having a positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens calculated by Gaussian optics theory is positive (or negative). The term "object side (or image side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The surface roughness determination of the lens can be performed by a determination method by a person of ordinary skill in the art, that is, by a sign of a radius of curvature (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in the lens data sheet (lens data sheet) of optical design software. When the R value is positive, the object side surface is judged to be convex; when the R value is negative, the object side surface is judged to be a concave surface. On the contrary, when the R value is positive, the image side surface is judged to be concave; when the R value is negative, the image side surface is determined to be convex.
The invention provides a zoom lens, which sequentially comprises a first lens, a fourth lens, a diaphragm, a fifth lens and a twelfth lens from an object side to an image side along an optical axis; the first lens element to the twelfth lens element each comprise an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens has negative refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative refractive index, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has negative refractive index, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface; the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the image side surface of the third lens is glued with the object side surface of the fourth lens; the first lens to the fourth lens form a compensating lens group;
the fifth lens has positive refractive index, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens element has positive refractive index, wherein the object-side surface of the sixth lens element is convex, and the image-side surface of the sixth lens element is convex; the seventh lens has negative refractive index, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a plane; the eighth lens has positive refractive index, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface; the ninth lens has positive refractive index, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface; the tenth lens has negative refractive index, the object side surface of the tenth lens is a convex surface, and the image side surface of the tenth lens is a concave surface; the eleventh lens has positive refractive index, the object side surface of the eleventh lens is a convex surface, and the image side surface of the eleventh lens is a convex surface; the twelfth lens has negative refractive power, the object side surface of the twelfth lens is a concave surface, and the image side surface of the twelfth lens is a convex surface; the image side surface of the sixth lens is glued with the object side surface of the seventh lens; the image side surface of the eleventh lens is glued with the object side surface of the twelfth lens; the fifth lens to the twelfth lens form a variable magnification lens group;
the object side surface and the image side surface of the first lens element to the twelfth lens element are spherical, the manufacturing is easy, the cost is low, and the zoom lens has only twelve lenses with refractive index. The invention can realize small multiple zooming, has the advantages of large light transmission, minimum aperture value reaching 1.5, small numerical difference from short focus to long Jiao Guangjuan, good control of transfer function, high resolution and imaging quality and low cost.
Preferably, the zoom lens further satisfies: 1.4< nd6<1.5, 80< vd6<95,1.8< nd7<1.9, 20< vd7<30, where nd6 and nd7 denote refractive indices of the sixth and seventh lenses, respectively, at d-line, and vd6 and vd7 denote dispersion coefficients of the sixth and seventh lenses, respectively, at d-line. On the premise of visible and infrared confocal, chromatic aberration of the purple wavelength is corrected, the blue-violet edge is well controlled, and the phenomenon of the blue-violet edge in real shooting is negligible.
Preferably, the zoom lens further satisfies: 1.45< nd11<1.6, 50< vd11<80,1.8< nd12<2.1, 20< vd12<30, where nd11 and nd12 represent refractive indices of the eleventh and twelfth lenses, respectively, at d-line, and vd11 and vd12 represent dispersion coefficients of the eleventh and twelfth lenses, respectively, at d-line. On the premise of visible and infrared confocal, chromatic aberration of the purple wavelength is corrected, the blue-violet edge is well controlled, and the phenomenon of the blue-violet edge in real shooting is negligible.
Preferably, the zoom lens further satisfies: 1.9< nd8<2, 16< vd8<20,1.9< nd9<2, 16< vd9<20, wherein nd8 and nd9 respectively represent refractive indexes of the eighth lens and the ninth lens at d line, vd8 and vd9 respectively represent dispersion coefficients of the eighth lens and the ninth lens at d line, the eighth lens and the ninth lens are made of the same material, chromatic aberration can be corrected well, and infrared confocal and blue-violet effect is better.
Preferably, the zoom lens further satisfies: 0.3< fw/BFLw <0.5, wherein fw is the shortest focal length, and BFLw is the back focal length when the shortest focal length is, so that the back focal length is longer, and the camera can be better adapted to various cameras.
Preferably, the zoom lens further satisfies: and 0.5< ft/BFLt <1, wherein ft is the longest focal length, and BFLt is the back focal length of the longest focal length, so that the back focal length is longer, and the camera can be better suitable for various cameras.
Preferably, the zoom lens further satisfies: TTL <75mm, wherein TTL is the distance from the object side surface to the imaging surface of the first lens on the optical axis, and the system length of the zoom lens is further optimized, so that the zoom lens is smaller and lighter.
The zoom lens of the present invention will be described in detail with specific embodiments.
Implement one
As shown in fig. 1 and 2, the present invention provides a zoom lens including, in order from an object side A1 to an image side A2 along an optical axis I, first to fourth lenses 11 to 14, a stop 3, fifth to twelfth lenses 21 to 28, a plate glass 4, and an imaging plane 5; the first lens element 11 to the twelfth lens element 28 each comprise an object side surface facing the object side A1 and passing the imaging light beam and an image side surface facing the image side A2 and passing the imaging light beam.
The first lens element 11 has a negative refractive power, wherein an object-side surface 111 of the first lens element 11 is convex, and an image-side surface 112 of the first lens element 11 is concave; the second lens element 12 has a negative refractive power, wherein an object-side surface 121 of the second lens element 12 is convex, and an image-side surface 122 of the second lens element 12 is concave; the third lens element 13 has a negative refractive power, wherein an object-side surface 131 of the third lens element 13 is concave, and an image-side surface 132 of the third lens element 13 is concave; the fourth lens element 14 has a positive refractive power, wherein an object-side surface 141 of the fourth lens element 14 is convex, and an image-side surface 142 of the fourth lens element 14 is convex; the image side 132 of the third lens element 13 and the object side 141 of the fourth lens element 14 are cemented together; the first lens 11 to the fourth lens 14 constitute the compensation lens group 1.
The fifth lens element 21 has a positive refractive power, wherein an object-side surface 211 of the fifth lens element 21 is convex, and an image-side surface 212 of the fifth lens element 21 is convex; the sixth lens element 22 with positive refractive power has a convex object-side surface 221 and a convex image-side surface 222 of the sixth lens element 22; the seventh lens element 23 has a negative refractive power, wherein an object-side surface 231 of the seventh lens element 23 is concave, and an image-side surface 232 of the seventh lens element 23 is planar; the eighth lens element 24 has a positive refractive power, wherein an object-side surface 241 of the eighth lens element 24 is concave, and an image-side surface 242 of the eighth lens element 24 is convex; the ninth lens element 25 has a positive refractive power, wherein an object-side surface 251 of the ninth lens element 25 is convex, and an image-side surface 252 of the ninth lens element 25 is convex; the tenth lens element 26 has a negative refractive power, wherein an object-side surface 261 of the tenth lens element 26 is convex, and an image-side surface 262 of the tenth lens element 26 is concave; the eleventh lens element 27 with positive refractive power has a convex object-side surface 271 and a convex image-side surface 272; the twelfth lens element 28 has a negative refractive power, wherein an object-side surface 281 of the twelfth lens element 28 is concave, and an image-side surface 282 of the twelfth lens element 28 is convex; the image side surface 222 of the sixth lens element 22 and the object side surface 231 of the seventh lens element 23 are cemented together; the image side surface 272 of the eleventh lens element 27 and the object side surface 281 of the twelfth lens element 28 are adhered to each other; the fifth lens 21 to the twelfth lens 28 constitute the magnification-varying lens group 2.
The object side surface and the image side surface of the first lens element 11 to the twelfth lens element 28 are spherical.
The detailed optical data at the longest focal length of this particular embodiment is shown in table 1-1.
Table 1-1 detailed optical data at the longest focal length for example one
The detailed optical data at the shortest focal length of this particular embodiment is shown in tables 1-2.
Table 1-2 detailed optical data at shortest focal length for embodiment one
| Surface of the body | Caliber (mm) | Radius of curvature (mm) | Thickness (mm) | Material of material | Refractive index | Coefficient of dispersion | Focal length (mm) | |
| - | Object plane | Infinity | Infinity | Infinity | ||||
| 111 | First lens | 26.324 | 178.880 | 1.400 | H-LAF50B | 1.773 | 49.613 | -14.000 |
| 112 | 17.564 | 10.210 | 3.488 | |||||
| 121 | Second lens | 17.376 | 21.417 | 1.200 | H-ZF1 | 1.648 | 33.842 | -96.481 |
| 122 | 16.242 | 15.626 | 4.963 | |||||
| 131 | Third lens | 15.606 | -29.403 | 0.850 | H-ZK7 | 1.613 | 60.614 | -14.560 |
| 132 | 15.510 | 13.033 | 0 | |||||
| 141 | Fourth lens | 15.510 | 13.033 | 3.690 | H-ZF5 | 1.740 | 28.291 | 16.446 |
| 142 | 15.396 | -184.810 | 23.055 | |||||
| 3 | Diaphragm | 8.944 | Infinity | 7.381 | ||||
| 211 | Fifth lens | 10.472 | 300.000 | 2.220 | TAFD40 | 2.001 | 25.458 | 23.268 |
| 212 | 10.610 | -25.403 | 0.100 | |||||
| 221 | Sixth lens | 10.124 | 11.047 | 3.920 | FCD10A | 1.459 | 90.195 | 11.681 |
| 222 | 9.438 | -9.285 | 0 | |||||
| 231 | Seventh lens | 9.438 | -9.285 | 0.710 | FD225 | 1.808 | 22.764 | -11.372 |
| 232 | 9.164 | Infinity | 1.302 | |||||
| 241 | Eighth lens | 9.066 | -12.266 | 3.620 | FDS18-W | 1.946 | 17.984 | 50.960 |
| 242 | 10.214 | -11.219 | 0.100 | |||||
| 251 | Ninth lens | 9.828 | 84.802 | 1.780 | FDS18-W | 1.946 | 17.984 | 27.038 |
| 252 | 9.574 | -36.927 | 0.100 | |||||
| 261 | Tenth lens | 9.020 | 22.888 | 0.700 | H-ZF12 | 1.762 | 26.613 | -13.413 |
| 262 | 8.394 | 7.013 | 0.186 | |||||
| 271 | Eleventh lens | 8.446 | 7.423 | 3.150 | FCD515 | 1.593 | 68.624 | 8.329 |
| 272 | 8.174 | -12.541 | 0 | |||||
| 281 | Twelfth lens | 8.174 | -12.541 | 1.900 | TAFD40 | 2.001 | 25.458 | -14.632 |
| 282 | 8.060 | -89.181 | 0.091 | |||||
| 4 | Flat glass | 8.026 | Infinity | 0.500 | H-K9L | 1.517 | 64.212 | Infinity |
| - | 7.968 | Infinity | 7.561 | |||||
| 5 | Imaging surface | 6.691 | Infinity |
Reference is made to fig. 63 for values of some conditional expressions of this embodiment.
The resolution of this embodiment is shown in fig. 3 to 6, it can be seen from the figure that the transfer control is good, the resolution and the imaging quality are high, the confocal between visible light and infrared 850nm is shown in fig. 7 to 10, the confocal between visible light and infrared 850nm is good, the imaging effect is still better when infrared 850nm is switched under the condition of focusing visible light, the curvature of field and distortion diagrams are shown in fig. 11 (a) and (B) and fig. 12 (a) and (B), the longitudinal chromatic aberration diagram is shown in fig. 13 and fig. 14, and the distortion is small, the chromatic aberration is small, and the imaging quality is high.
In this embodiment, the focal length f=3.1 to 8.6mm of the zoom lens; aperture value fno=1.49-2.2.
Implement two
In this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data at the longest focal length of this particular embodiment is shown in table 2-1.
Table 2-1 detailed optical data at longest focal length for example two
The detailed optical data at the shortest focal length of this particular embodiment is shown in tables 2-2.
Table 2-2 detailed optical data at shortest focal length for example two
| Surface of the body | Caliber (mm) | Radius of curvature (mm) | Thickness (mm) | Material of material | Refractive index | Coefficient of dispersion | Focal length (mm) | |
| - | Object plane | Infinity | Infinity | Infinity | ||||
| 111 | First lens | 26.746 | 188.013 | 1.400 | H-LAF50B | 1.773 | 49.613 | -14.663 |
| 112 | 17.910 | 10.482 | 3.194 | |||||
| 121 | Second lens | 19.000 | 19.454 | 1.200 | H-ZBAF16 | 1.667 | 48.432 | -91.767 |
| 122 | 17.000 | 14.341 | 5.702 | |||||
| 131 | Third lens | 15.580 | -30.671 | 0.850 | H-ZK7 | 1.613 | 60.614 | -15.158 |
| 132 | 15.377 | 13.205 | 0 | |||||
| 141 | Fourth lens | 15.377 | 13.205 | 3.690 | H-ZF5 | 1.740 | 28.291 | 17.626 |
| 142 | 15.223 | -291.289 | 22.782 | |||||
| 3 | Diaphragm | 8.900 | Infinity | 7.475 | ||||
| 211 | Fifth lens | 12.000 | 197.402 | 2.222 | H-ZLAF90 | 2.001 | 25.435 | 24.296 |
| 212 | 12.000 | -26.657 | 0.100 | |||||
| 221 | Sixth lens | 10.392 | 10.867 | 3.870 | H-FK71 | 1.457 | 90.270 | 12.096 |
| 222 | 10.392 | -9.792 | 0 | |||||
| 231 | Seventh lens | 10.392 | -9.792 | 0.710 | H-ZF71 | 1.808 | 22.691 | -12.523 |
| 232 | 12.000 | Infinity | 1.219 | |||||
| 241 | Eighth lens | 10.000 | -12.844 | 3.585 | FDS18-W | 1.946 | 17.984 | 56.399 |
| 242 | 13.000 | -11.633 | 0.187 | |||||
| 251 | Ninth lens | 11.507 | 100.742 | 1.691 | H-ZF88 | 1.946 | 17.944 | 32.563 |
| 252 | 11.400 | -41.538 | 0.114 | |||||
| 261 | Tenth lens | 8.900 | 22.468 | 0.700 | H-ZF12 | 1.762 | 26.613 | -14.834 |
| 262 | 10.271 | 7.279 | 0.264 | |||||
| 271 | Eleventh lens | 11.044 | 7.901 | 3.150 | FCD515 | 1.593 | 68.624 | 8.889 |
| 272 | 11.044 | -13.019 | 0 | |||||
| 281 | Twelfth lens | 11.044 | -13.019 | 1.875 | H-ZLAF90 | 2.001 | 25.435 | -16.908 |
| 282 | 11.267 | -67.255 | 0.098 | |||||
| 4 | Flat glass | 13.468 | Infinity | 0.500 | H-K9L | 1.517 | 64.212 | Infinity |
| - | 13.658 | Infinity | 7.587 | |||||
| 5 | Imaging surface | 6.602 | Infinity |
Reference is made to fig. 63 for values of some conditional expressions of this embodiment.
The resolution of this embodiment is shown in fig. 15 to 18, it can be seen from the figure that the transfer control is good, the resolution and the imaging quality are high, the confocal between visible light and infrared 850nm is shown in fig. 19 to 22, the confocal between visible light and infrared 850nm is good, the imaging effect is still better when infrared 850nm is switched under the condition of focusing visible light, the curvature of field and distortion patterns are shown in fig. 23 (a) and (B) and fig. 24 (a) and (B), the longitudinal chromatic aberration patterns are shown in fig. 25 and fig. 26, and the distortion is small, the chromatic aberration is small, and the imaging quality is high.
In this embodiment, the focal length f=3.1 to 8.6mm of the zoom lens; aperture value fno=1.49-2.2.
Implementation three
In this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data at the longest focal length of this particular embodiment is shown in table 3-1.
Table 3-1 detailed optical data at longest focal length for example three
The detailed optical data at the shortest focal length of this particular embodiment is shown in tables 3-2.
Table 3-2 detailed optical data at shortest focal length for example three
| Surface of the body | Caliber (mm) | Radius of curvature (mm) | Thickness (mm) | Material of material | Refractive index | Coefficient of dispersion | Focal length (mm) | |
| - | Object plane | Infinity | Infinity | Infinity | ||||
| 111 | First lens | 25.960 | 197.709 | 1.400 | H-LAF50B | 1.770 | 49.610 | -14.003 |
| 112 | 17.372 | 10.143 | 3.596 | |||||
| 121 | Second lens | 17.178 | 23.130 | 1.200 | H-ZF1 | 1.650 | 33.840 | -96.724 |
| 122 | 16.092 | 16.376 | 4.803 | |||||
| 131 | Third lens | 15.452 | -30.604 | 0.850 | H-ZK7 | 1.610 | 60.610 | -14.550 |
| 132 | 15.346 | 12.779 | 0 | |||||
| 141 | Fourth lens | 15.346 | 12.779 | 3.690 | H-ZF5 | 1.740 | 28.290 | 16.443 |
| 142 | 15.224 | -211.625 | 22.782 | |||||
| 3 | Diaphragm | 8.864 | Infinity | 7.490 | ||||
| 211 | Fifth lens | 10.416 | 230.673 | 2.270 | H-ZLAF90 | 2.000 | 25.460 | 23.268 |
| 212 | 10.550 | -25.723 | 0.100 | |||||
| 221 | Sixth lens | 10.054 | 10.693 | 3.870 | H-FK71 | 1.460 | 90.190 | 11.684 |
| 222 | 9.356 | -9.597 | 0 | |||||
| 231 | Seventh lens | 9.356 | -9.597 | 0.710 | H-ZF71 | 1.810 | 22.760 | -11.375 |
| 232 | 9.094 | Infinity | 1.271 | |||||
| 241 | Eighth lens | 9.058 | -12.930 | 3.570 | FDS16-W | 1.990 | 16.480 | 50.982 |
| 242 | 10.100 | -11.570 | 0.191 | |||||
| 251 | Ninth lens | 9.670 | 191.422 | 1.680 | H-ZF88 | 1.950 | 17.940 | 27.042 |
| 252 | 9.430 | -38.660 | 0.114 | |||||
| 261 | Tenth lens | 8.908 | 22.385 | 0.700 | H-ZF12 | 1.760 | 26.610 | -13.412 |
| 262 | 8.310 | 7.112 | 0.237 | |||||
| 271 | Eleventh lens | 8.384 | 7.634 | 3.150 | FCD515 | 1.590 | 68.620 | 8.325 |
| 272 | 8.134 | -12.310 | 0 | |||||
| 281 | Twelfth lens | 8.134 | -12.310 | 1.800 | H-ZLAF90 | 2.000 | 25.460 | -14.623 |
| 282 | 8.082 | -57.304 | 0.107 | |||||
| 4 | Flat glass | 8.036 | Infinity | 0.500 | H-K9L | 1.520 | 64.210 | Infinity |
| - | 7.976 | Infinity | 7.554 | |||||
| 5 | Imaging surface | 6.604 | Infinity |
Reference is made to fig. 63 for values of some conditional expressions of this embodiment.
The resolution of this embodiment is shown in fig. 27 to 30, it can be seen from the figure that the transfer control is good, the resolution and the imaging quality are high, the confocal between visible light and infrared 850nm is shown in fig. 31 to 34, the confocal between visible light and infrared 850nm is good, the imaging effect is still better when infrared 850nm is switched under the condition of focusing visible light, the curvature of field and distortion diagram are shown in fig. 35 (a) and (B) and fig. 36 (a) and (B), the longitudinal chromatic aberration diagram is shown in fig. 37 and fig. 38, and the distortion is small, the chromatic aberration is small, and the imaging quality is high.
In this embodiment, the focal length f=3.1 to 8.6mm of the zoom lens; aperture value fno=1.49-2.2.
Implement four
In this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data at the longest focal length of this particular embodiment is shown in table 4-1.
Table 4-1 detailed optical data at longest focal length for example four
| Surface of the body | Caliber (mm) | Radius of curvature (mm) | Thickness (mm) | Material of material | Refractive index | Coefficient of dispersion | Focal length (mm) | |
| - | Object plane | Infinity | Infinity | Infinity | ||||
| 111 | First lens | 26.324 | 178.880 | 1.400 | H-LAF50B | 1.773 | 49.613 | -14.000 |
| 112 | 17.564 | 10.210 | 3.488 | |||||
| 121 | Second lens | 17.376 | 21.417 | 1.200 | H-ZF1 | 1.648 | 33.842 | -96.482 |
| 122 | 16.242 | 15.626 | 4.963 | |||||
| 131 | Third lens | 15.606 | -29.403 | 0.850 | H-ZK7 | 1.613 | 60.614 | -14.560 |
| 132 | 15.510 | 13.033 | 0 | |||||
| 141 | Fourth lens | 15.510 | 13.033 | 3.690 | H-ZF5 | 1.740 | 28.291 | 16.446 |
| 142 | 15.396 | -184.810 | 2.634 | |||||
| 3 | Diaphragm | 8.944 | Infinity | 0.513 | ||||
| 211 | Fifth lens | 10.472 | 300.000 | 2.220 | TAFD40 | 2.001 | 25.458 | 23.268 |
| 212 | 10.610 | -25.403 | 0.100 | |||||
| 221 | Sixth lens | 10.124 | 11.047 | 3.920 | FCD10A | 1.459 | 90.195 | 11.681 |
| 222 | 9.438 | -9.285 | 0 | |||||
| 231 | Seventh lens | 9.438 | -9.285 | 0.710 | FD225 | 1.808 | 22.764 | -11.372 |
| 232 | 9.164 | Infinity | 1.302 | |||||
| 241 | Eighth lens | 9.066 | -12.266 | 3.620 | FDS18-W | 1.946 | 17.984 | 50.960 |
| 242 | 10.214 | -11.219 | 0.100 | |||||
| 251 | Ninth lens | 9.828 | 84.802 | 1.780 | FDS18-W | 1.946 | 17.984 | 27.038 |
| 252 | 9.574 | -36.927 | 0.100 | |||||
| 261 | Tenth lens | 9.020 | 22.888 | 0.700 | H-ZF12 | 1.762 | 26.613 | -13.413 |
| 262 | 8.394 | 7.013 | 0.186 | |||||
| 271 | Eleventh lens | 8.446 | 7.423 | 3.150 | FCD515 | 1.593 | 68.624 | 8.329 |
| 272 | 8.174 | -12.541 | 0 | |||||
| 281 | Twelfth lens | 8.174 | -12.541 | 1.900 | TAFD40 | 2.001 | 25.458 | -14.632 |
| 282 | 8.060 | -89.181 | 6.958 | |||||
| 4 | Flat glass | 8.026 | Infinity | 0.500 | H-K9L | 1.517 | 64.212 | Infinity |
| - | 7.968 | Infinity | 7.561 | |||||
| 5 | Imaging surface | 6.612 | Infinity |
The detailed optical data at the shortest focal length of this particular embodiment is shown in tables 4-2.
Table 4-2 detailed optical data at shortest focal length for example four
| Surface of the body | Caliber (mm) | Radius of curvature (mm) | Thickness (mm) | Material of material | Refractive index | Coefficient of dispersion | Focal length (mm) | |
| - | Object plane | Infinity | Infinity | Infinity | ||||
| 111 | First lens | 26.324 | 178.880 | 1.400 | H-LAF50B | 1.773 | 49.613 | -14.000 |
| 112 | 17.564 | 10.210 | 3.488 | |||||
| 121 | Second lens | 17.376 | 21.417 | 1.200 | H-ZF1 | 1.648 | 33.842 | -96.481 |
| 122 | 16.242 | 15.626 | 4.963 | |||||
| 131 | Third lens | 15.606 | -29.403 | 0.850 | H-ZK7 | 1.613 | 60.614 | -14.560 |
| 132 | 15.510 | 13.033 | 0 | |||||
| 141 | Fourth lens | 15.510 | 13.033 | 3.690 | H-ZF5 | 1.740 | 28.291 | 16.446 |
| 142 | 15.396 | -184.810 | 23.055 | |||||
| 3 | Diaphragm | 8.944 | Infinity | 7.381 | ||||
| 211 | Fifth lens | 10.472 | 300.000 | 2.220 | TAFD40 | 2.001 | 25.458 | 23.268 |
| 212 | 10.610 | -25.403 | 0.100 | |||||
| 221 | Sixth lens | 10.124 | 11.047 | 3.920 | FCD10A | 1.459 | 90.195 | 11.681 |
| 222 | 9.438 | -9.285 | 0 | |||||
| 231 | Seventh lens | 9.438 | -9.285 | 0.710 | FD225 | 1.808 | 22.764 | -11.372 |
| 232 | 9.164 | Infinity | 1.302 | |||||
| 241 | Eighth lens | 9.066 | -12.266 | 3.620 | FDS18-W | 1.946 | 17.984 | 50.960 |
| 242 | 10.214 | -11.219 | 0.100 | |||||
| 251 | Ninth lens | 9.828 | 84.802 | 1.780 | FDS18-W | 1.946 | 17.984 | 27.038 |
| 252 | 9.574 | -36.927 | 0.100 | |||||
| 261 | Tenth lens | 9.020 | 22.888 | 0.700 | H-ZF12 | 1.762 | 26.613 | -13.413 |
| 262 | 8.394 | 7.013 | 0.186 | |||||
| 271 | Eleventh lens | 8.446 | 7.423 | 3.150 | FCD515 | 1.593 | 68.624 | 8.329 |
| 272 | 8.174 | -12.541 | 0 | |||||
| 281 | Twelfth lens | 8.174 | -12.541 | 1.900 | TAFD40 | 2.001 | 25.458 | -14.632 |
| 282 | 8.060 | -89.181 | 0.091 | |||||
| 4 | Flat glass | 8.026 | Infinity | 0.500 | H-K9L | 1.517 | 64.212 | Infinity |
| - | 7.968 | Infinity | 7.561 | |||||
| 5 | Imaging surface | 6.691 | Infinity |
Reference is made to fig. 63 for values of some conditional expressions of this embodiment.
The resolution of this embodiment is shown in fig. 39 to 42, it can be seen from the figure that the transfer control is good, the resolution and the imaging quality are high, the confocal between visible light and infrared 850nm is shown in fig. 43 to 46, the confocal between visible light and infrared 850nm is good, the imaging effect is still better when infrared 850nm is switched under the condition of focusing visible light, the curvature of field and distortion patterns are shown in fig. 47 (a) and (B) and fig. 48 (a) and (B), the longitudinal chromatic aberration patterns are shown in fig. 49 and fig. 50, and the distortion is small, the chromatic aberration is small, and the imaging quality is high.
In this embodiment, the focal length f=3.1 to 8.6mm of the zoom lens; aperture value fno=1.49-2.2.
Implement five kinds of
In this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data at the longest focal length of this particular embodiment is shown in table 5-1.
Table 5-1 detailed optical data at longest focal length for example five
| Surface of the body | Caliber (mm) | Radius of curvature (mm) | Thickness (mm) | Material of material | Refractive index | Coefficient of dispersion | Focal length (mm) | |
| - | Object plane | Infinity | Infinity | Infinity | ||||
| 111 | First lens | 26.332 | 178.040 | 1.400 | H-LAF50B | 1.773 | 49.613 | -14.003 |
| 112 | 17.566 | 10.209 | 3.475 | |||||
| 121 | Second lens | 17.382 | 21.317 | 1.200 | H-ZF1 | 1.648 | 33.842 | -96.724 |
| 122 | 16.246 | 15.579 | 4.981 | |||||
| 131 | Third lens | 15.604 | -29.355 | 0.850 | H-ZK7 | 1.613 | 60.614 | -14.550 |
| 132 | 15.510 | 13.029 | 0 | |||||
| 141 | Fourth lens | 15.510 | 13.029 | 3.690 | H-ZF5 | 1.740 | 28.291 | 16.444 |
| 142 | 15.394 | -185.055 | 2.635 | |||||
| 3 | Diaphragm | 8.944 | Infinity | 0.512 | ||||
| 211 | Fifth lens | 10.472 | 300.000 | 2.220 | TAFD40 | 2.001 | 25.458 | 23.268 |
| 212 | 10.610 | -25.403 | 0.100 | |||||
| 221 | Sixth lens | 10.124 | 11.051 | 3.920 | FCD10A | 1.459 | 90.195 | 11.684 |
| 222 | 9.438 | -9.288 | 0 | |||||
| 231 | Seventh stepLens | 9.438 | -9.288 | 0.710 | FD225 | 1.808 | 22.764 | -11.376 |
| 232 | 9.166 | Infinity | 1.301 | |||||
| 241 | Eighth lens | 9.066 | -12.271 | 3.620 | FDS18-W | 1.946 | 17.984 | 50.982 |
| 242 | 10.214 | -11.224 | 0.100 | |||||
| 251 | Ninth lens | 9.828 | 85.184 | 1.780 | FDS18-W | 1.946 | 17.984 | 27.042 |
| 252 | 9.574 | -36.864 | 0.100 | |||||
| 261 | Tenth lens | 9.020 | 22.890 | 0.700 | H-ZF12 | 1.762 | 26.613 | -13.412 |
| 262 | 8.394 | 7.013 | 0.185 | |||||
| 271 | Eleventh lens | 8.446 | 7.421 | 3.150 | FCD515 | 1.593 | 68.624 | 8.325 |
| 272 | 8.176 | -12.532 | 0 | |||||
| 281 | Twelfth lens | 8.176 | -12.532 | 1.900 | TAFD40 | 2.001 | 25.458 | -14.623 |
| 282 | 8.062 | -89.067 | 6.961 | |||||
| 4 | Flat glass | 8.028 | Infinity | 0.500 | H-K9L | 1.517 | 64.212 | Infi n it y |
| - | 7.968 | I n fi n it y | 7.561 | |||||
| 5 | Imaging surface | 6.612 | Infinity |
The detailed optical data at the shortest focal length of this particular embodiment is shown in tables 5-2.
Table 5-2 detailed optical data at shortest focal length for example five
Reference is made to fig. 63 for values of some conditional expressions of this embodiment.
The resolution of this embodiment is shown in fig. 51 to 54, it can be seen from the figure that the transfer control is good, the resolution and the imaging quality are high, the confocal between visible light and infrared 850nm is shown in fig. 55 to 58, the confocal between visible light and infrared 850nm is good, under the condition of focusing visible light, the imaging effect is still better when infrared 850nm is switched, the field curvature and distortion patterns are shown in fig. 59 (a) and (B) and fig. 60 (a) and (B), the longitudinal chromatic aberration patterns are shown in fig. 60 and fig. 62, and the distortion is small, the chromatic aberration is small, and the imaging quality is high.
In this embodiment, the focal length f=3.1 to 8.6mm of the zoom lens; aperture value fno=1.49-2.2.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A zoom lens, characterized in that: the lens system comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm and a fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens, the diaphragm and the fifth lens are sequentially arranged from an object side to an image side along an optical axis; the first lens element to the twelfth lens element each comprise an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens has negative refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative refractive index, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has negative refractive index, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface; the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the image side surface of the third lens is glued with the object side surface of the fourth lens; the first lens to the fourth lens form a compensating lens group;
the fifth lens has positive refractive index, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens element has positive refractive index, wherein the object-side surface of the sixth lens element is convex, and the image-side surface of the sixth lens element is convex; the seventh lens has negative refractive index, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a plane; the eighth lens has positive refractive index, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface; the ninth lens has positive refractive index, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface; the tenth lens has negative refractive index, the object side surface of the tenth lens is a convex surface, and the image side surface of the tenth lens is a concave surface; the eleventh lens has positive refractive index, the object side surface of the eleventh lens is a convex surface, and the image side surface of the eleventh lens is a convex surface; the twelfth lens has negative refractive power, the object side surface of the twelfth lens is a concave surface, and the image side surface of the twelfth lens is a convex surface; the image side surface of the sixth lens is glued with the object side surface of the seventh lens; the image side surface of the eleventh lens is glued with the object side surface of the twelfth lens; the fifth lens to the twelfth lens form a variable magnification lens group;
the object side surface and the image side surface of the first lens to the twelfth lens are spherical, and the lens with refractive index of the zoom lens is only twelve pieces;
the zoom lens also satisfies: 1.4< nd6<1.5, 80< vd6<95,1.8< nd7<1.9, 20< vd7<30,1.45< nd11<1.6, 50< vd11<80,1.8< nd12<2.1, 20< vd12<30, where nd6 and nd7 represent refractive indices of the sixth and seventh lenses at d-line, nd11 and nd12 represent refractive indices of the eleventh and twelfth lenses at d-line, respectively, vd6 and vd7 represent dispersion coefficients of the sixth and seventh lenses at d-line, respectively, and vd11 and vd12 represent dispersion coefficients of the eleventh and twelfth lenses at d-line, respectively.
2. The zoom lens of claim 1, wherein the zoom lens further satisfies: 1.9< nd8<2, 16< vd8<20,1.9< nd9<2, 16< vd9<20, wherein nd8 and nd9 represent refractive indices of the eighth and ninth lenses, respectively, at d-line, and vd8 and vd9 represent dispersion coefficients of the eighth and ninth lenses, respectively, at d-line.
3. The zoom lens of claim 1, wherein the zoom lens further satisfies: 0.3< fw/BFLw <0.5, where fw is the shortest focal length and BFLw is the back focal length at the shortest focal length.
4. The zoom lens of claim 1, wherein the zoom lens further satisfies: 0.5< ft/BFLt <1, where ft is the longest focal length and BFLt is the back focal length at the longest focal length.
5. The zoom lens of claim 1, wherein the zoom lens further satisfies: 53.44mm < TTL <75mm, wherein TTL is the distance from the object side surface to the imaging surface of the first lens on the optical axis.
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| CN110346927A (en) * | 2019-08-16 | 2019-10-18 | 厦门力鼎光电股份有限公司 | A kind of zoom lens |
| CN110542997A (en) * | 2019-10-10 | 2019-12-06 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
| CN112859308A (en) * | 2019-11-27 | 2021-05-28 | 中强光电股份有限公司 | Zoom lens and method for manufacturing the same |
| CN111399177A (en) * | 2020-04-24 | 2020-07-10 | 厦门力鼎光电股份有限公司 | High-resolution zoom lens |
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| JP5009571B2 (en) * | 2006-08-28 | 2012-08-22 | 富士フイルム株式会社 | Zoom lens |
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|---|---|---|---|---|
| JP2009003259A (en) * | 2007-06-22 | 2009-01-08 | Fujinon Corp | Zoom lens for projection and projection type display device |
| JP2010122326A (en) * | 2008-11-17 | 2010-06-03 | Fujinon Corp | Zoom lens for projection and projection-type display device |
| CN109116532A (en) * | 2018-10-17 | 2019-01-01 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN209640592U (en) * | 2019-05-07 | 2019-11-15 | 厦门力鼎光电股份有限公司 | A kind of zoom lens |
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| Publication number | Publication date |
|---|---|
| CN110082894A (en) | 2019-08-02 |
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