CN110286479B - Zoom lens - Google Patents
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- CN110286479B CN110286479B CN201910568905.1A CN201910568905A CN110286479B CN 110286479 B CN110286479 B CN 110286479B CN 201910568905 A CN201910568905 A CN 201910568905A CN 110286479 B CN110286479 B CN 110286479B
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- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 239000011521 glass Substances 0.000 claims description 10
- 125000006850 spacer group Chemical group 0.000 claims description 10
- 230000008859 change Effects 0.000 abstract description 8
- 238000003384 imaging method Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- 230000004075 alteration Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005499 meniscus Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction 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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- 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
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- 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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
The embodiment of the invention discloses a zoom lens. The lens comprises a compensating lens group with negative focal power and a variable-power lens group with positive focal power, wherein the compensating lens group and the variable-power lens group are arranged from an object side to an image side along an optical axis, and move back and forth along the optical axis during zooming; the compensation lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power, which are sequentially arranged from an object side to an image side; the zoom lens group comprises a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power which are sequentially arranged from the object side to the image side. The zoom lens provided by the embodiment of the invention has the focal length zoom ratio of more than 4, does not run out of focus when being used in an environment of-40-80 ℃, has wide range of change of the angle of view, can realize confocal of visible light and infrared light, has imaging definition and resolution of more than 4K and has the maximum aperture of F1.3.
Description
Technical Field
The embodiment of the invention relates to an optical lens technology, in particular to a zoom lens.
Background
Because the angle of view of the fixed focus lens is fixed, a product can only be applied to specific scenes, so that the fixed focus lens can not meet the use requirements in a plurality of scenes. The zoom lens is popular in the market because the focal length is continuously variable, the angle of view is also continuously variable within a certain range, and the zoom lens can adapt to more application scenes. The camera with 4K (3840×2160) resolution has very high resolution and very high reduction degree of the details of the monitoring picture, so that the camera has great attention and application in the security field.
The wide-angle zoom lens is a common lens type of a security monitoring system, the resolution of the wide-angle zoom lens which is currently mainstream is mainly concentrated in a region from three megapixels to six megapixels, the type which can meet the 4K requirement is very few, and the wide-angle zoom lens is generally high in cost and difficult to popularize in a large scale.
Disclosure of Invention
The embodiment of the invention provides a zoom lens to realize the design of a low-cost large-aperture ultra-wide-angle ultra-high-definition zoom lens, the focal length zoom ratio is larger than 4, the zoom lens is not out of focus when used in an environment of minus 40 ℃ to plus 80 ℃, the change range of the angle of view is wide, the confocal of visible light and infrared light can be realized, the imaging definition and resolution are both above 4K, the maximum aperture can reach F1.3, and the comprehensive performance is excellent.
The embodiment of the invention provides a zoom lens, which comprises a compensation lens group with negative focal power and a zoom lens group with positive focal power, wherein the compensation lens group and the zoom lens group are arranged from an object side to an image side along an optical axis, and move back and forth along the optical axis during zooming;
The compensating lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power, which are sequentially arranged from an object space to an image space;
The zoom lens group comprises a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power which are sequentially arranged from an object side to an image side;
the focal length of the compensation lens group and the focal length of the zoom lens group satisfy the following relation:
0.55<∣Ff'/Bf'∣<1.7；
The focal lengths of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the ninth lens and the focal lengths of the compensation lens group and the focal lengths of the variable magnification lens group satisfy the following relational expression:
1<∣f2/Ff'∣<4；
1.2<∣f3/Ff'∣<6.1；
0.85<∣f4/Bf'∣<3.5；
0.65<∣f5/Bf'∣<2.5；
0.65<∣f6/Bf'∣<2.1；
0.5<∣f9/Bf'∣<5；
0.7<∣f5/f6∣<1.8；
Wherein f2, f3, f4, f5, f6, and f9 represent focal lengths of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the ninth lens, respectively, ff 'represents a focal length of the compensation lens group, and Bf' represents a focal length of the magnification-varying lens group.
Optionally, each focal length and refractive index of the first lens to the ninth lens satisfy the following conditions:
Wherein f1 to f9 respectively represent focal lengths of the first lens to the ninth lens, the unit is mm, and n1 to n9 respectively represent refractive indexes of the first lens to the ninth lens.
Optionally, the first lens is one of a convex-concave lens, a plano-concave lens or a biconcave lens; the second lens is a biconcave lens; the third lens is one of a convex-concave lens, a convex-flat lens or a biconvex lens.
Optionally, the first lens and the second lens are directly supported by a lens edge, and the second lens and the third lens are directly supported by a lens edge.
Optionally, the fourth lens is one of a convex flat lens, a biconvex lens or a convex concave lens; the fifth lens is one of a convex flat lens, a biconvex lens or a convex concave lens; the sixth lens is one of a biconcave lens, a convex-concave lens and a plano-concave lens; the seventh lens is a biconvex lens; the eighth lens is one of a biconcave lens, a concave-convex lens or a concave-flat lens; the ninth lens is one of a biconvex lens, a convex-concave lens or a convex-flat lens.
Optionally, a spacer ring is used to support the fourth lens and the fifth lens, a spacer ring is used to support the sixth lens and the seventh lens, the seventh lens and the eighth lens form a double-cemented lens, and a spacer ring is used to support the eighth lens and the ninth lens.
Optionally, the lens assembly further comprises a diaphragm arranged between the third lens and the fourth lens.
Optionally, the first lens, the seventh lens and the eighth lens are spherical lenses, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the ninth lens are aspherical lenses.
Optionally, the first lens, the seventh lens and the eighth lens are all glass spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens and the ninth lens are all plastic aspherical lenses.
Optionally, the fourth lens is a glass aspheric lens or a plastic aspheric lens.
The zoom lens provided by the embodiment of the invention comprises a compensation lens group with negative focal power and a zoom lens group with positive focal power, wherein the compensation lens group and the zoom lens group are arranged from an object side to an image side along an optical axis, and move back and forth along the optical axis during zooming; the compensation lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power, which are sequentially arranged from an object side to an image side; the zoom lens group comprises a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power which are sequentially arranged from the object side to the image side; the interval between the two lens groups is changed by the reciprocating movement of the compensation lens group and the zoom lens group along the optical axis to realize zooming, and the focal length zoom ratio is larger than 4; through the reasonable design of the structure and the matching between the materials of each lens, the lens can be used in the environment of-40 ℃ to 80 ℃ without running focus, the change range of the view angle is wide, the change range of the view angle is less than 32 DEG and more than 145 DEG, the confocal effect of visible light and infrared light can be achieved, the imaging definition and resolution are both more than 4K, the maximum aperture reaches F1.3, the manufacturing cost is reduced while the high performance of the lens is ensured, and the lens has wide market prospect.
Drawings
Fig. 1 is a schematic view of a wide-angle end of a zoom lens according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a zoom lens according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a modulation transfer function MTF of visible light at a wide-angle end of a zoom lens according to an embodiment of the present invention;
Fig. 4 is a schematic view of an MTF curve of infrared light at a wide-angle end of a zoom lens according to an embodiment of the present invention;
Fig. 5 is a schematic view of an MTF curve of visible light at a telephoto end of a zoom lens according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an MTF curve of infrared light at a telephoto end of the zoom lens according to the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that, the terms "upper", "lower", "left", "right", and the like in the embodiments of the present invention are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in the context, it will also be understood that when an element is referred to as being formed "on" or "under" another element, it can be directly formed "on" or "under" the other element or be indirectly formed "on" or "under" the other element through intervening elements. The terms "first," "second," and the like, are used for descriptive purposes only and not for any order, quantity, or importance, but rather are used to distinguish between different components. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a wide-angle end of a zoom lens according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a telephoto end of a zoom lens according to an embodiment of the present invention. Referring to fig. 1 and 2, a zoom lens provided by an embodiment of the present invention includes a compensation lens group 10 of negative power and a magnification-varying lens group 20 of positive power arranged along an optical axis from an object side to an image side, the compensation lens group 10 and the magnification-varying lens group 20 reciprocally moving along the optical axis upon zooming; the compensation lens group 10 includes a first lens 101 of negative power, a second lens 102 of negative power, and a third lens 103 of positive power, which are arranged in order from the object side to the image side; the magnification-varying lens group 20 includes a fourth lens 201 of positive power, a fifth lens 202 of positive power, a sixth lens 203 of negative power, a seventh lens 204 of positive power, an eighth lens 205 of negative power, and a ninth lens 206 of positive power, which are arranged in order from the object side to the image side;
the focal length of the compensation lens group 10 and the focal length of the variable magnification lens group 20 satisfy the following relation:
0.55<∣Ff'/Bf'∣<1.7；
The focal lengths of the second lens 102, the third lens 103, the fourth lens 201, the fifth lens 202, the sixth lens 203, and the ninth lens 206 satisfy the following relationship with the focal length of the compensation lens group 10 and the focal length of the variable magnification lens group 20:
1<∣f2/Ff'∣<4；
1.2<∣f3/Ff'∣<6.1；
0.85<∣f4/Bf'∣<3.5；
0.65<∣f5/Bf'∣<2.5；
0.65<∣f6/Bf'∣<2.1；
0.5<∣f9/Bf'∣<5；
0.7<∣f5/f6∣<1.8；
Where f2, f3, f4, f5, f6, and f9 denote focal lengths of the second lens 102, the third lens 103, the fourth lens 201, the fifth lens 202, the sixth lens 203, and the ninth lens 206, respectively, ff 'denotes a focal length of the compensation lens group 10, and Bf' denotes a focal length of the variable magnification lens group 20.
It will be appreciated that the optical power is equal to the difference between the image and object beam convergence, which characterizes the ability of the optical system to deflect light. The greater the absolute value of the optical power, the greater the ability to bend the light, the smaller the absolute value of the optical power, and the weaker the ability to bend the light. When the focal power is positive, the refraction of the light rays is convergent; when the optical power is negative, the refraction of the light is divergent. The optical power may be suitable for characterizing a refractive surface of a lens (i.e. a surface of a lens), for characterizing a lens, or for characterizing a system of lenses together (i.e. a lens group). In the present embodiment, the compensation lens group 10 and the magnification-varying lens group 20 may be provided in one barrel (not shown in fig. 1), the magnification-varying lens group 20 is used to realize a lens focal length variation, the compensation lens group 10 is used to compensate for aberrations caused when the magnification-varying lens group 20 moves, and a clear zoom function is realized by a combined movement of the compensation lens group 10 and the magnification-varying lens group 20. By setting the focal length of the compensation lens group 10 and the focal length of the variable magnification lens group 20 to satisfy 0.55< |ff '/Bf' | <1.7, a focal length variable magnification ratio of greater than 4 can be achieved; by adjusting the focal lengths of the second lens 102, the third lens 103, the fourth lens 201, the fifth lens 202, the sixth lens 203 and the ninth lens 206, the focal length of the compensation lens group 10 and the focal length of the variable magnification lens group 20, the requirements of miniaturization and high performance can be achieved.
According to the technical scheme, the interval between the two lens groups is changed by reciprocating the compensation lens group and the zoom lens group along the optical axis, so that zooming is realized, and the focal length zoom ratio is larger than 4; through the reasonable design of the structure and the matching between the materials of each lens, the lens can be used in the environment of-40 ℃ to 80 ℃ without running focus, the change range of the view angle is wide, the change range of the view angle is less than 32 DEG and more than 145 DEG, the confocal effect of visible light and infrared light can be achieved, the imaging definition and resolution are both more than 4K, the maximum aperture reaches F1.3, the manufacturing cost is reduced while the high performance of the lens is ensured, and the lens has wide market prospect.
On the basis of the above-described technical solution, optionally, each focal length and refractive index of the first lens 101 to the ninth lens 206 satisfy the following conditions:
TABLE 1 focal length and refractive index of lenses
| f1＝-19～-5 | n1＝1.5～2.05 |
| f2＝-38～-9.4 | n2＝1.43～1.75 |
| f3＝10～50 | n3＝1.5～2.05 |
| f4＝8.5～35 | n4＝1.43～1.75 |
| f5＝10～50 | n5＝1.4～1.65 |
| f6＝-27～-6.5 | n6＝1.5～1.85 |
| f7＝4.1～16.8 | n7＝1.4～1.7 |
| f8＝-12.3～-3.1 | n8＝1.45～1.85 |
| f9＝5.9～100 | n9＝1.4～1.85 |
Where f1 to f9 denote focal lengths of the first lens 101 to the ninth lens 206, respectively, in mm, and n1 to n9 denote refractive indices of the first lens 101 to the ninth lens 206, respectively.
Optionally, the first lens 101 is one of a convex-concave lens, a plano-concave lens, or a biconcave lens; the second lens 102 is a biconcave lens; the third lens 103 is one of a convex-concave lens, a convex-flat lens, or a biconvex lens.
Alternatively, the first lens 101 and the second lens 102 are directly supported by the lens edges, and the second lens 102 and the third lens 103 are directly supported by the lens edges.
In practical implementation, the shapes of the lenses can be designed according to practical conditions and requirements, in this embodiment, the first lens 101, the second lens 102 and the third lens 103 are closer, and can be directly supported by the edges of the lenses, so that the relative positions of the lenses in the compensation lens group 10 can be fixed, and the collision of the light effective diameter areas of the two lenses can be avoided.
Optionally, the fourth lens 201 is one of a convex flat lens, a biconvex lens, or a convex concave lens; the fifth lens 202 is one of a convex flat lens, a biconvex lens, or a convex concave lens; the sixth lens 203 is one of a biconcave lens, a convex-concave lens, and a plano-concave lens; the seventh lens 204 is a biconvex lens; the eighth lens 205 is one of a biconcave lens, a meniscus lens, or a concave-flat lens; the ninth lens 206 is one of a biconvex lens, a convex-concave lens, or a convex-flat lens.
Optionally, a spacer ring is used to support the fourth lens 201 and the fifth lens 202, a spacer ring is used to support the sixth lens 203 and the seventh lens 204, the seventh lens 204 and the eighth lens 205 form a double-cemented lens, and a spacer ring is used to support the eighth lens 205 and the ninth lens 206.
In the present embodiment, the fourth lens 201 is relatively far from the edges of the fifth lens 202, the sixth lens 203, the seventh lens 204, the eighth lens 206 and the ninth lens 206, and thus the relative positions of the lenses in the variable magnification lens group 20 are fixed by bearing with a spacer ring. By forming the seventh lens 204 and the eighth lens 205 into a double cemented lens, chromatic aberration can be effectively eliminated, and infrared confocal effect of the lens can be improved.
Optionally, with continued reference to fig. 1 and 2, the zoom lens provided in the present embodiment further includes a diaphragm 30 disposed between the third lens 103 and the fourth lens 201. When the zoom lens zooms, the diaphragm 30 is fixed, and the compensation lens group 10 and the zoom lens group 20 can selectively move.
Optionally, the first lens 101, the seventh lens 204, and the eighth lens 205 are spherical lenses, and the second lens 102, the third lens 103, the fourth lens 201, the fifth lens 202, the sixth lens 203, and the ninth lens 206 are aspherical lenses.
Optionally, the first lens 101, the seventh lens 204 and the eighth lens 205 are all glass spherical lenses, and the second lens 102, the third lens 103, the fifth lens 202, the sixth lens 203 and the ninth lens 206 are all plastic aspherical lenses.
According to the embodiment of the invention, a glass-plastic mixed optical structure is adopted, the glass lens is easy to process, and the plastic aspheric lens can well correct aberration, so that the resolution of the lens is improved, the resolution of 4K is achieved, the aperture is increased, and the large aperture of F1.3 is supported maximally.
Optionally, the fourth lens 201 is a glass aspheric lens or a plastic aspheric lens. In design, the parameters of the fourth lens 201 are reasonably optimized to effectively enlarge the aperture and reduce the volume of the zoom lens, and the glass aspheric lens easy to process or the plastic aspheric lens with lower cost can be adopted according to actual requirements, which is not limited by the embodiment of the invention.
Exemplary, table 2 shows design values of parameters of each lens of the zoom lens according to the embodiment of the present invention:
table 2 design values of each lens of zoom lens
| Face number | Surface type | R | D | nd | k |
| 1 | Spherical surface | 134.28 | 0.7 | 1.77 | |
| 2 | Spherical surface | 7.25 | 4.67 | ||
| 3 | Aspherical surface | -18.93 | 1.07 | 1.54 | -23.10 |
| 4 | Aspherical surface | 23.02 | 0.55 | 4.10 | |
| 5 | Aspherical surface | 12.99 | 1.95 | 1.66 | -19.10 |
| 6 | Aspherical surface | 81.93 | Air interval is variable | -145.60 | |
| Diaphragm | Plane surface | PL | Air interval is variable | ||
| 7 | Aspherical surface | 8.14 | 2.56 | 1.53 | 0.25 |
| 8 | Aspherical surface | 48.69 | 0.1 | 78.30 | |
| 9 | Aspherical surface | 7.73 | 1.45 | 1.53 | -8.82 |
| 10 | Aspherical surface | -84.77 | 0.05 | -91.63 | |
| 11 | Aspherical surface | -78.19 | 0.89 | 1.62 | -89.42 |
| 12 | Aspherical surface | 9.09 | 0.1 | -0.53 | |
| 13 | Spherical surface | 9.88 | 2.65 | 1.55 | |
| 14 | Spherical surface | -7.19 | 0 | ||
| 15 | Spherical surface | -7.19 | 1.11 | 1.61 | |
| 16 | Spherical surface | 7.19 | 1 | ||
| 17 | Aspherical surface | 6.37 | 1.94 | 1.53 | -15.52 |
| 18 | Aspherical surface | 215.60 | Air interval is variable | -10.42 | |
| 19 | Image plane | Plane surface |
Wherein, the plane number 1 indicates the front surface of the first lens 101 near the object side, and so on, PL indicates that the surface is a plane; r represents the spherical radius, positive represents one side of the spherical center close to the image plane, and negative represents one side of the spherical center close to the object plane; d represents the distance on the optical axis from the current surface to the next surface; nd represents the refractive index of the lens; k represents the conic coefficient of the aspherical surface.
Wherein, the surface shape of each aspheric lens is represented by the formula:
And determining, wherein z is sagittal height, c is curvature at the vertex of the curved surface, r is the distance between the projection of the coordinates of the curved surface point on the plane perpendicular to the optical axis and the optical axis, k is a conical coefficient, and a 1、a2、a3、a4、a5、a6、a7 and a 8 represent coefficients corresponding to even terms.
Table 3 shows the even term coefficients for each of the aspherical surfaces in the above examples:
Table 3 aspherical parameters
| Face number | a1 | a2 | a3 | a4 | a5 | a6 | a7 | a8 |
| 3 | 0 | -1.251807E-4 | -1.231690E-4 | 2.336421E-5 | -3.128164E-6 | -6.110247E-8 | 0 | 0 |
| 4 | 0 | -1.381426E-3 | -2.583452E-4 | 6.991472E-5 | -7.554671E-6 | 1.317432E-7 | 0 | 0 |
| 5 | 0 | 1.684651E-3 | -7.614720E-4 | 1.253214E-4 | -1.664723E-5 | 1.297412E-7 | 0 | 0 |
| 6 | 0 | 8.921745E-3 | -1.487014E-3 | 1.331472E-4 | 8.213241E-6 | -1.837121E-6 | 0 | 0 |
| 7 | 0 | 1.881256E-4 | -6.118213E-4 | 2.184151E-5 | 1.214281E-5 | -1.262101E-6 | 0 | 0 |
| 8 | 0 | 1.614752E-3 | -6.940023E-4 | 2.527101E-5 | 1.727322E-6 | -1.531025E-8 | 0 | 0 |
| 9 | 0 | -8.024715E-4 | -1.910123E-5 | -1.516123E-6 | 5.216241E-8 | 1.017632E-9 | 0 | 0 |
| 10 | 0 | 7.223765E-5 | 8.821565E-6 | -1.216523E-6 | 8.719271E-9 | 9.615672E-10 | 0 | 0 |
| 11 | 0 | 7.965115E-4 | -6.031505E-5 | -1.726301E-6 | 1.721801E-7 | 8.861306E-9 | 0 | 0 |
| 12 | 0 | -3.121605E-4 | -2.961601E-5 | -2.641602E-6 | 3.813561E-7 | 9.291321E-9 | 0 | 0 |
| 17 | 0 | -8.064115E-4 | -1.091805E-4 | 2.721501E-6 | -3.521903E-7 | 2.881506E-8 | 0 | 0 |
| 18 | 0 | -5.421705E-4 | -1.361901E-4 | 6.621504E-6 | -4.811501E-7 | 3.281463E-8 | 0 | 0 |
Wherein, plane numbers 3, 5, 7, 9, 11, 17 correspond to the front surfaces of the second lens 102, the third lens 103, the fourth lens 201, the fifth lens 202, the sixth lens 203 and the ninth lens 206, respectively, which are close to the object plane, and plane numbers 4, 6, 8, 10, 12, 18 correspond to the rear surfaces of the second lens 102, the third lens 103, the fourth lens 201, the fifth lens 202, the sixth lens 203 and the ninth lens 206, which are close to the image plane, respectively, -1.251807E-4 represents-1.251807 ×10 -4.
Fig. 3 is a schematic MTF curve diagram of a modulation transfer function of visible light at a wide-angle end of a zoom lens according to an embodiment of the present invention, fig. 4 is a schematic MTF curve diagram of infrared light at a wide-angle end of a zoom lens according to an embodiment of the present invention, fig. 5 is a schematic MTF curve diagram of visible light at a telephoto end of a zoom lens according to an embodiment of the present invention, and fig. 6 is a schematic MTF curve diagram of infrared light at a telephoto end of a zoom lens according to an embodiment of the present invention. The zoom lens provided by the embodiment adopts an optical structure that a glass spherical lens and a plastic aspherical lens are mixed, so that the cost of the lens is effectively reduced, the glass lens is easy to process, the plastic aspherical lens can better correct aberration, the lens has higher imaging performance, the lens has a zoom lens group with positive total focal power and a compensation lens group with negative total focal power, the zooming function can be realized by changing the interval between the zoom lens group and the compensation lens group, the focal length zoom ratio is larger than 4, the lens can be used without focusing in an environment of-40-80 ℃ by reasonably matching the materials of the plastic aspherical lens, the field angle change range is wide, the field angle change range is less than 32 DEG to 145 DEG, and the effects of confocal visible light and infrared light and imaging definition and resolution are above 4K can also be achieved.
Note that the above is only a preferred embodiment of the present invention and the technical principle 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 changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (6)
1. A zoom lens characterized by comprising a compensation lens group of negative power and a zoom lens group of positive power arranged from an object side to an image side along an optical axis, the compensation lens group and the zoom lens group reciprocally move along the optical axis when zooming, and the compensation lens group and the zoom lens group are composed of nine lenses in total;
The compensating lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power, which are sequentially arranged from an object space to an image space;
The zoom lens group comprises a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power which are sequentially arranged from an object side to an image side;
the focal length of the compensation lens group and the focal length of the zoom lens group satisfy the following relation:
0.55<∣Ff'/Bf'∣<1.7；
The focal lengths of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the ninth lens and the focal lengths of the compensation lens group and the focal lengths of the variable magnification lens group satisfy the following relational expression:
1<∣f2/Ff'∣<4；
1.2<∣f3/Ff'∣<6.1；
0.85<∣f4/Bf'∣<3.5；
0.65<∣f5/Bf'∣<2.5；
0.65<∣f6/Bf'∣<2.1；
0.5<∣f9/Bf'∣<5；
0.7<∣f5/f6∣<1.8；
Wherein f2, f3, f4, f5, f6, and f9 represent focal lengths of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the ninth lens, respectively, ff 'represents a focal length of the compensation lens group, and Bf' represents a focal length of the magnification-varying lens group;
parameters of each lens in the zoom lens satisfy:
Wherein, the plane number 1 indicates the front surface of the first lens close to the object side, and so on, and PL indicates that the surface is a plane; r represents the spherical radius, the unit is mm, positive represents one side of the spherical center close to the image plane, and negative represents one side of the spherical center close to the object plane; d represents the distance on the optical axis from the current surface to the next surface in mm; nd represents the refractive index of the lens; k represents the conic coefficient of the aspherical surface.
2. The zoom lens of claim 1, wherein the first lens and the second lens are directly supported by a lens edge, and the second lens and the third lens are directly supported by a lens edge.
3. The zoom lens of claim 1, wherein a spacer ring is used between the fourth lens and the fifth lens, a spacer ring is used between the sixth lens and the seventh lens, the seventh lens and the eighth lens form a double cemented lens, and a spacer ring is used between the eighth lens and the ninth lens.
4. The zoom lens according to claim 1, wherein the first lens, the seventh lens, and the eighth lens are spherical lenses, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the ninth lens are aspherical lenses.
5. The zoom lens of claim 4, wherein the first lens, the seventh lens, and the eighth lens are all glass spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens, and the ninth lens are all plastic aspherical lenses.
6. The zoom lens of claim 4, wherein the fourth lens is a glass aspheric lens or a plastic aspheric lens.
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| CN110865451A (en) * | 2019-12-23 | 2020-03-06 | 宁波舜宇红外技术有限公司 | Zoom lens |
| WO2021195885A1 (en) * | 2020-03-30 | 2021-10-07 | 深圳市大疆创新科技有限公司 | Optical system, photographing device, and movable platform |
| CN114859525B (en) * | 2022-05-09 | 2023-11-14 | 杭州海康威视数字技术股份有限公司 | Optical lens and camera |
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| CN103197409A (en) * | 2013-04-01 | 2013-07-10 | 东莞市宇瞳光学科技有限公司 | Optical compensation zoom lens |
| CN105467566A (en) * | 2016-01-07 | 2016-04-06 | 东莞市宇瞳光学科技股份有限公司 | Large-aperture wide-angle zoom lens |
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| JP2007271697A (en) * | 2006-03-30 | 2007-10-18 | Fujinon Corp | Zoom lens for projection and projection type display device |
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| CN103197409A (en) * | 2013-04-01 | 2013-07-10 | 东莞市宇瞳光学科技有限公司 | Optical compensation zoom lens |
| CN105467566A (en) * | 2016-01-07 | 2016-04-06 | 东莞市宇瞳光学科技股份有限公司 | Large-aperture wide-angle zoom lens |
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