CN209895083U - Zoom lens - Google Patents
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- CN209895083U CN209895083U CN201920992143.3U CN201920992143U CN209895083U CN 209895083 U CN209895083 U CN 209895083U CN 201920992143 U CN201920992143 U CN 201920992143U CN 209895083 U CN209895083 U CN 209895083U
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Abstract
The embodiment of the utility model discloses zoom. The lens comprises a compensation lens group with negative focal power and a zoom lens group with positive focal power, which are arranged from an object side to an image side along an optical axis, wherein the compensation lens group and the zoom lens group reciprocate 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 variable power 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 utility model provides a zoom lens, its focus zoom ratio is greater than 4, uses under-40 ℃ -80 ℃ of environment not to run burnt, and visual field angle wide variation range can realize that the confocal and formation of image definition of visible light and infrared light all is more than 4K with resolution ratio, and the biggest light ring can reach F1.3.
Description
Technical Field
The embodiment of the utility model provides a relate to optical lens technique, especially relate to a zoom lens.
Background
Because the field angle of the fixed-focus lens is fixed, one product can only be applied to specific scenes, and the fixed-focus lens cannot meet the use requirements in many scenes. The zoom lens has a continuously variable focal length, and a continuously variable field angle within a certain range, and is adaptable to a wider variety of application scenarios, and thus is increasingly popular in the market. The camera with the resolution of 4K (3840 multiplied by 2160) has ultrahigh definition and extremely high restoration degree of the details of the monitoring picture, so the camera is greatly concerned and applied in the security field.
The wide-angle zoom lens is a lens type commonly used for a security monitoring system, the resolution ratio of the currently mainstream wide-angle zoom lens is mainly concentrated in an interval from three million pixels to six million pixels, few types capable of meeting the 4K requirement are available, and the wide-angle zoom lens is generally high in cost and difficult to popularize in a large scale.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a zoom lens to realize the design of the big light ring super wide angle super high definition zoom lens of a low cost, its focus zoom ratio is greater than 4, uses under the environment of-40- +80 ℃ and does not run burnt, and visual field angle wide variation range can realize that visible light and infrared light are confocal and imaging definition all more than 4K with resolution ratio, and the biggest light ring can reach F1.3, and the comprehensive properties is excellent.
The embodiment of the utility model provides a zoom lens, including the compensation lens group of the negative focal power and the zoom lens group of the positive focal power that arrange from the object space to the image space along the optical axis, compensation lens group and the zoom lens group reciprocate along the optical axis when 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 focal length of the compensation lens group and the focal length of the zoom lens group satisfy the following relational expression:
0.55<∣Ff'/Bf'∣<1.7；
the focal lengths of the second lens, the third lens, the fifth lens, the sixth lens, the eighth lens and the ninth lens, and the focal length of the compensation lens group and the focal length of the variable power lens group satisfy the following relations:
1<∣f2/Ff'∣<4；
1.5<∣f3/Ff'∣<5.8；
0.7<∣f5/Bf'∣<2.8；
1<∣f6/Bf'∣<3.8；
0.6<∣f8/Bf'∣<2.5；
0.7<∣f9/Bf'∣<2.8；
0.35<∣f5/f6∣<1.5；
wherein f2, f3, f5, f6, f8 and f9 respectively denote focal lengths of the second lens, the third lens, the fifth lens, the sixth lens, the eighth lens and the ninth lens, Ff 'denotes a focal length of the compensation lens group, and Bf' denotes a focal length of the variable power lens group.
Optionally, each of the focal lengths and refractive indices of the first lens to the ninth lens satisfies the following condition:
wherein f1 to f9 respectively represent focal lengths of the first to ninth lenses in mm, and n1 to n9 respectively represent refractive indices of the first to ninth lenses.
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 directly bear against each other through lens edges, and the second lens and the third lens directly bear against each other through lens edges.
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 one of a convex-flat lens, a biconvex lens or a convex-concave 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 is used between the fourth lens and the fifth lens, a spacer is used between the sixth lens and the seventh lens, a spacer is used between the seventh lens and the eighth lens, and a spacer is used between the eighth lens and the ninth lens.
Optionally, the optical module further includes a diaphragm disposed between the third lens and the fourth lens.
Optionally, the first lens, the fourth lens and the seventh lens are all glass lenses, and the second lens, the third lens, the fifth lens, the sixth lens, the eighth lens and the ninth lens are all plastic lenses.
Optionally, the first lens is a glass spherical lens, and the second lens, the third lens, the fifth lens, the sixth lens, the eighth lens and the ninth lens are all plastic aspheric lenses.
Optionally, the fourth lens is a glass spherical lens or a glass aspheric lens, and the seventh lens is a glass spherical lens or a glass aspheric lens.
The embodiment of the utility model provides a zoom lens, including the compensation lens group of the negative focal power and the zoom lens group of the positive focal power that arrange from the object space to the image space along the optical axis, compensation lens group and zoom lens group along the optical axis reciprocating motion when 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 reciprocating the compensation lens group and the zoom lens group along the optical axis to realize zooming, and the zoom ratio of the focal length is more than 4; through reasonable design of the structure and material matching of each lens, the lens can be used in an environment of-40-80 ℃ without focusing, the change range of the field angle is wide, the change range of the field angle is from below 32 degrees to above 145 degrees, the confocal imaging definition and the resolution ratio of visible light and infrared light can be achieved to be above 4K, the maximum aperture reaches F1.3, the high performance of the lens is guaranteed, the manufacturing cost is reduced, and the wide market prospect is achieved.
Drawings
Fig. 1 is a schematic structural diagram of a wide-angle end of a zoom lens according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a telephoto end of a zoom lens according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an MTF curve of a modulation transfer function of visible light at a wide-angle end of the 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 the zoom lens provided in the embodiment of the present invention;
fig. 5 is a schematic view of an MTF curve of visible light at the telephoto end of the zoom lens according to an embodiment of the present invention;
fig. 6 is a schematic view of an MTF curve of infrared light at the telephoto end of the zoom lens according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
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 used in the embodiments of the present invention are described in terms of the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "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 an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a schematic diagram of a wide-angle end of a zoom lens according to an embodiment of the present invention, and fig. 2 is a schematic 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 according to an embodiment of the present invention includes a compensation lens group 10 having negative refractive power and a variable power lens group 20 having positive refractive power, which are arranged along an optical axis from an object side to an image side, wherein the compensation lens group 10 and the variable power lens group 20 reciprocate along the optical axis when 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 variable power lens group 20 includes a fourth lens 201 with positive power, a fifth lens 202 with positive power, a sixth lens 203 with negative power, a seventh lens 204 with positive power, an eighth lens 205 with negative power, and a ninth lens 206 with 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 power 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 fifth lens 202, the sixth lens 203, the eighth lens 205, and the ninth lens 206, and the focal length of the compensation lens group 10 and the focal length of the variable power lens group 20 satisfy the following relational expressions:
1<∣f2/Ff'∣<4；
1.5<∣f3/Ff'∣<5.8；
0.7<∣f5/Bf'∣<2.8；
1<∣f6/Bf'∣<3.8；
0.6<∣f8/Bf'∣<2.5；
0.7<∣f9/Bf'∣<2.8；
0.35<∣f5/f6∣<1.5；
where f2, f3, f5, f6, f8, and f9 respectively denote focal lengths of the second lens 102, the third lens 103, the fifth lens 202, the sixth lens 203, the eighth lens 205, and the ninth lens 206, Ff 'denotes a focal length of the compensation lens group 10, and Bf' denotes a focal length of the variable power lens group 20.
It will be appreciated that the optical power is equal to the difference between the image-side and object-side beam convergence, which characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal power is, the stronger the bending ability to the light ray is, and the smaller the absolute value of the focal power is, the weaker the bending ability to the light ray is. When the focal power is positive, the refraction of the light is convergent; when the focal power is negative, the refraction of the light is divergent. The optical power can be suitable for representing a certain refractive surface of a lens (namely, a surface of the lens), can be suitable for representing a certain lens, and can also be suitable for representing a system (namely a lens group) formed by a plurality of lenses together. In the present embodiment, the compensation lens group 10 and the variable power lens group 20 may be disposed in a lens barrel (not shown in fig. 1), the variable power lens group 20 is used to implement a lens focal length change, the compensation lens group 10 is used to compensate aberrations caused when the variable power lens group 20 moves, and a clear zoom function is implemented by the combined movement of the compensation lens group 10 and the variable power lens group 20. By setting the focal length of the compensation lens group 10 and the focal length of the variable power lens group 20 to satisfy 0.55< | Ff '/Bf' | <1.7, a focal length zoom ratio greater than 4 can be achieved; by adjusting the focal length of the second lens 102, the third lens 103, the fifth lens 202, the sixth lens 203, the eighth lens 205 and the ninth lens 206, the focal length of the compensation lens group 10 and the focal length of the variable power lens group 20, the requirements of miniaturization and high performance can be achieved.
According to the technical scheme of the embodiment, the interval between the two lens groups is changed by reciprocating the compensation lens group and the zoom lens group along the optical axis to realize zooming, and the zoom ratio of the focal length is more than 4; through reasonable design of the structure and material matching of each lens, the lens can be used in an environment of-40-80 ℃ without focusing, the change range of the field angle is wide, the change range of the field angle is from below 32 degrees to above 145 degrees, the confocal imaging definition and the resolution ratio of visible light and infrared light can be achieved to be above 4K, the maximum aperture reaches F1.3, the high performance of the lens is guaranteed, the manufacturing cost is reduced, and the wide market prospect is achieved.
On the basis of the above technical solution, optionally, the respective focal lengths and refractive indices of the first lens 101 to the ninth lens 206 satisfy the following conditions:
TABLE 1 lens focal Length and refractive index
| f1＝-20.5～-5.2 | n1＝1.5～2.05 |
| f2＝-38～-9.4 | n2＝1.43～1.75 |
| f3＝10～50 | n3＝1.5～2.05 |
| f4＝10.1～45 | n4＝1.43～1.75 |
| f5＝7.3～31 | n5＝1.4～1.65 |
| f6＝-42～-10.8 | n6＝1.5～1.85 |
| f7＝9.5～38.3 | n7＝1.4～1.7 |
| f8＝-25～-6.3 | n8＝1.45～1.85 |
| f9＝7.3～60 | n9＝1.4～1.85 |
Where f1 to f9 respectively represent focal lengths of the first lens 101 to the ninth lens 206 in mm, and n1 to n9 respectively represent refractive indices of the first lens 101 to the ninth lens 206.
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 edge, and the second lens 102 and the third lens 103 are directly supported by the lens edge.
In specific implementation, the shape of each lens can be designed according to actual conditions and requirements, in this embodiment, the first lens 101, the second lens 102, and the third lens 103 are closer to each other and can be directly supported by the edge of the lens, so that the relative position of each lens in the compensation lens group 10 is fixed, and the collision of the effective ray diameter areas of the two lenses is 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 one of a convex-flat lens, a biconvex lens, or a convex-concave 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 is used between the fourth lens 201 and the fifth lens 202, a spacer is used between the sixth lens 203 and the seventh lens 204, a spacer is used between the seventh lens 204 and the eighth lens 205, and a spacer is used between the eighth lens 205 and the ninth lens 206.
In this embodiment, the distances between the edges of the fourth lens 201 and the fifth lens 202, the sixth lens 203 and the seventh lens 204, the seventh lens 204 and the eighth lens 205, and the eighth lens 206 and the ninth lens 206 are relatively far, so that the lenses are supported by the spacing rings, thereby fixing the relative positions of the lenses in the variable power lens group 20.
Optionally, with continuing reference to fig. 1 and fig. 2, the zoom lens provided in this embodiment further includes a diaphragm 30 disposed between the third lens 103 and the fourth lens 201. When the zoom lens zooms, the stop 30 is fixed, and the compensation lens group 10 and the zoom lens group 20 can be selectively moved.
Optionally, the first lens 101, the fourth lens 201, and the seventh lens 204 are all glass lenses, and the second lens 102, the third lens 103, the fifth lens 202, the sixth lens 203, the eighth lens 205, and the ninth lens 206 are all plastic lenses.
Optionally, the first lens 101 is a glass spherical lens, and the second lens 102, the third lens 103, the fifth lens 202, the sixth lens 203, the eighth lens 205, and the ninth lens 206 are all plastic aspheric lenses.
In the technical solution of this embodiment, the seventh lens 204 and the eighth lens 205 are separated, and the achromatic effect of a glass spherical lens and a plastic aspheric lens is close to that of a double-cemented lens, which is more advantageous in cost. The embodiment of the utility model provides an adopt the glass to mould the optical structure who mixes, glass lens easily processes, and correction aberration that plastics aspheric lens can be better for the resolution of camera lens improves, reaches 4K resolution ratio, and the light ring increase, the big light ring of the biggest support F1.3.
Optionally, the fourth lens 201 is a glass spherical lens or a glass aspheric lens, and the seventh lens 204 is a glass spherical lens or a glass aspheric lens. In designing, if higher performance is required, glass aspheric lenses are used for the fourth lens 201 and the seventh lens 204, and if lower processing cost is required and the performance requirement is met, glass spherical lenses are used for the fourth lens 201 and the seventh lens 204.
Exemplarily, table 2 shows design values of lens parameters of a zoom lens provided by embodiments of the present invention:
TABLE 2 design values for lenses of zoom lens
| Number of noodles | Surface type | R | D | nd | k |
| 1 | Spherical surface | 107.69 | 0.70 | 1.77 | |
| 2 | Spherical surface | 7.31 | 4.95 | ||
| 3 | Aspherical surface | -22.73 | 1.01 | 1.54 | -23.10 |
| 4 | Aspherical surface | 19.36 | 0.47 | 4.10 | |
| 5 | Aspherical surface | 13.75 | 2.01 | 1.66 | -19.10 |
| 6 | Aspherical surface | 134.11 | Variable air spacing | -145.60 | |
| Diaphragm | Plane surface | PL | Variable air spacing | ||
| 7 | Spherical surface | 7.46 | 1.39 | 1.59 | 0.25 |
| 8 | Spherical surface | 14.61 | 0.10 | 78.30 | |
| 9 | Aspherical surface | 9.35 | 1.55 | 1.53 | -8.82 |
| 10 | Aspherical surface | -57.07 | 0.05 | -91.63 | |
| 11 | Aspherical surface | -83.04 | 0.95 | 1.62 | -89.42 |
| 12 | Aspherical surface | 16.22 | 0.10 | -0.53 | |
| 13 | Spherical surface | 9.52 | 2.30 | 1.44 | |
| 14 | Spherical surface | -65.60 | 0.10 | ||
| 15 | Aspherical surface | -83.18 | 1.65 | 1.62 | -210.10 |
| 16 | Aspherical surface | 8.66 | 1.13 | -0.28 | |
| 17 | Aspherical surface | 6.66 | 1.86 | 1.53 | -15.52 |
| 18 | Aspherical surface | 39.66 | Variable air spacing | -10.42 | |
| 19 | Image plane | Plane surface |
Wherein, the surface number 1 represents the front surface of the first lens 101 close to the object space, and so on, PL represents that the surface is a plane; r represents the radius of the spherical surface, positive represents the side of the center of the spherical surface close to the image surface, and negative represents the side of the center of the spherical surface close to the object surface; d represents the distance on the optical axis from the current surface to the next surface; nd represents a refractive index of the lens; k denotes the conic coefficient of the aspheric surface.
The surface type of each aspheric lens is represented by the formula:
determining, wherein z is rise, 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 vertical to the optical axis and the optical axis, k is a cone coefficient, a1、a2、a3、a4、a5、a6、a7And a8Representing the coefficients corresponding to the even term.
Table 3 shows the even term coefficients of the respective aspherical surfaces in the above examples:
TABLE 3 aspheric parameters
| Number of noodles | 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 | 1.317432 |
0 | 0 |
| 5 | 0 | 1.684651E-3 | -7.614720E-4 | 1.253214E-4 | -1.664723E-5 | 1.297412 |
0 | 0 |
| 6 | 0 | 8.921745E-3 | -1.487014E-3 | 1.331472E-4 | 8.213241E-6 | -1.837121E-6 | 0 | 0 |
| 9 | 0 | 1.881256E-4 | -6.118213E-4 | 2.184151E-5 | 1.214281E-5 | -1.262101E-6 | 0 | 0 |
| 10 | 0 | 1.614752E-3 | -6.940023E-4 | 2.527101E-5 | 1.727322E-6 | -1.531025E-8 | 0 | 0 |
| 11 | 0 | -8.024715E-4 | -1.910123E-5 | -1.516123E-6 | 5.216241E-8 | 1.017632 |
0 | 0 |
| 12 | 0 | 7.223765E-5 | 8.821565E-6 | -1.216523E-6 | 8.719271E-9 | 9.615672 |
0 | 0 |
| 15 | 0 | 7.965115E-4 | -6.031505E-5 | -1.726301E-6 | 1.721801E-7 | 8.861306 |
0 | 0 |
| 16 | 0 | -3.121605E-4 | -2.961601E-5 | -2.641602E-6 | 3.813561E-7 | 9.291321 |
0 | 0 |
| 17 | 0 | -8.064115E-4 | -1.091805E-4 | 2.721501E-6 | -3.521903E-7 | 2.881506 |
0 | 0 |
| 18 | 0 | -5.421705E-4 | -1.361901E-4 | 6.621504E-6 | -4.811501E-7 | 3.281463 |
0 | 0 |
Wherein, the surface numbers 3, 5, 9, 11, 15, 17 correspond to the front surfaces of the second lens 102, the third lens 103, the fifth lens 202, the sixth lens 203, the eighth lens 205, and the ninth lens 206 close to the object plane, respectively, and the surface numbers 4, 6, 10, 12, 16, 18 correspond to the rear surfaces of the second lens 102, the third lens 103, the fifth lens 202, the sixth lens 203, the eighth lens 205, and the ninth lens 206 close to the image plane, respectively, -1.251807E-4 represents-1.251807 × 10-4。
Fig. 3 shows the modulation transfer function MTF curve diagram of the wide-angle end visible light of the zoom lens provided by the embodiment of the utility model, fig. 4 shows and does the utility model provides a MTF curve diagram of the wide-angle end infrared light of the zoom lens, fig. 5 shows and does the utility model provides a MTF curve diagram of the far-end visible light of zoom lens telescope, fig. 6 shows and does the utility model provides a MTF curve diagram of the far-end infrared light of zoom lens telescope. The zoom lens provided by the embodiment adopts the optical structure of mixing the glass spherical lens and the plastic aspheric lens, so that the cost of the lens is effectively reduced, the glass lens is easy to process, the plastic aspheric lens can better correct the aberration, the lens has higher imaging performance, the lens has a variable power 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 zoom ratio of the focal length is more than 4, by reasonably matching the materials of the plastic aspheric lens, the lens can be used in an environment of-40-80 ℃ without focusing, has a wide field angle variation range, the field angle variation range is from below 32 degrees to above 145 degrees, and can achieve the effects of confocal visible light and infrared light and over 4K of imaging definition and resolution.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A zoom lens comprising a compensation lens group of negative power and a variable power lens group of positive power arranged from an object side to an image side along an optical axis, the compensation lens group and the variable power lens group being reciprocated along the optical axis upon 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 focal length of the compensation lens group and the focal length of the zoom lens group satisfy the following relational expression:
0.55<∣Ff'/Bf'∣<1.7；
the focal lengths of the second lens, the third lens, the fifth lens, the sixth lens, the eighth lens and the ninth lens, and the focal length of the compensation lens group and the focal length of the variable power lens group satisfy the following relations:
1<∣f2/Ff'∣<4；
1.5<∣f3/Ff'∣<5.8；
0.7<∣f5/Bf'∣<2.8；
1<∣f6/Bf'∣<3.8；
0.6<∣f8/Bf'∣<2.5；
0.7<∣f9/Bf'∣<2.8；
0.35<∣f5/f6∣<1.5；
wherein f2, f3, f5, f6, f8 and f9 respectively denote focal lengths of the second lens, the third lens, the fifth lens, the sixth lens, the eighth lens and the ninth lens, Ff 'denotes a focal length of the compensation lens group, and Bf' denotes a focal length of the variable power lens group.
2. The zoom lens according to claim 1, wherein each of the focal lengths and refractive indices of the first lens to the ninth lens satisfies the following condition:
wherein f1 to f9 respectively represent focal lengths of the first to ninth lenses in mm, and n1 to n9 respectively represent refractive indices of the first to ninth lenses.
3. The zoom lens according to claim 1, wherein 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.
4. The zoom lens of claim 3, wherein the first lens and the second lens are directly abutted by lens edges, and wherein the second lens and the third lens are directly abutted by lens edges.
5. The zoom lens according to claim 1, wherein 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 one of a convex-flat lens, a biconvex lens or a convex-concave 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.
6. The zoom lens according to claim 5, wherein the fourth lens and the fifth lens are supported by a spacer, the sixth lens and the seventh lens are supported by a spacer, the seventh lens and the eighth lens are supported by a spacer, and the eighth lens and the ninth lens are supported by a spacer.
7. The zoom lens according to claim 1, further comprising a diaphragm disposed between the third lens and the fourth lens.
8. The zoom lens according to claim 1, wherein the first lens, the fourth lens, and the seventh lens are each a glass lens, and the second lens, the third lens, the fifth lens, the sixth lens, the eighth lens, and the ninth lens are each a plastic lens.
9. The zoom lens according to claim 8, wherein the first lens is a glass spherical lens, and the second lens, the third lens, the fifth lens, the sixth lens, the eighth lens, and the ninth lens are each a plastic aspherical lens.
10. The zoom lens according to claim 8, wherein the fourth lens is a glass spherical lens or a glass aspherical lens, and the seventh lens is a glass spherical lens or a glass aspherical lens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920992143.3U CN209895083U (en) | 2019-06-27 | 2019-06-27 | Zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920992143.3U CN209895083U (en) | 2019-06-27 | 2019-06-27 | Zoom lens |
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| CN209895083U true CN209895083U (en) | 2020-01-03 |
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| CN201920992143.3U Active CN209895083U (en) | 2019-06-27 | 2019-06-27 | Zoom lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174756A (en) * | 2019-06-27 | 2019-08-27 | 东莞市宇瞳光学科技股份有限公司 | A kind of zoom lens |
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2019
- 2019-06-27 CN CN201920992143.3U patent/CN209895083U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174756A (en) * | 2019-06-27 | 2019-08-27 | 东莞市宇瞳光学科技股份有限公司 | A kind of zoom lens |
| CN110174756B (en) * | 2019-06-27 | 2024-05-24 | 东莞市宇瞳光学科技股份有限公司 | Zoom lens |
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