CN117055201B - 8-time zoom security lens - Google Patents
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- CN117055201B CN117055201B CN202311321217.8A CN202311321217A CN117055201B CN 117055201 B CN117055201 B CN 117055201B CN 202311321217 A CN202311321217 A CN 202311321217A CN 117055201 B CN117055201 B CN 117055201B
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- 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
- G02B15/144—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 having four groups only
- G02B15/1441—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 having four groups only the first group being positive
- G02B15/144105—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 having four groups only the first group being positive arranged +-+-
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- 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
- G02B15/163—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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Abstract
The application relates to a zoom security lens, which sequentially comprises a first fixed lens group G1 with positive focal power, a variable-magnification lens G2 with negative focal power, a compensating lens group G3 with positive focal power, a diaphragm positioned on the front surface of a tenth lens L10 in a second fixed lens group and a second fixed lens group G4 with negative focal power along the direction from an object side to an image side, wherein the compensating lens group and the variable-magnification lens group can move along the optical axis; through reasonable lens configuration, the zoom ratio of 8 times can be realized, and the zoom range of 20 mm-160 mm is satisfied; the moving distance T1 of the variable magnification lens group and the moving distance T2 of the compensation lens group meet the following conditional expression: T1/T2 is more than or equal to 2.72 and less than or equal to 3.9; the zoom lens has the characteristics of high zoom ratio, long focal length, miniaturization and good imaging quality.
Description
Technical Field
The application discloses an 8-time zoom security lens, which is mainly applied to the field of monitoring, relates to the field of optical lenses and optical designs, and particularly relates to a zoom security lens.
Background
In recent years, along with the rapid development of modern society, the safety consciousness of people is continuously promoted, the security industry of China is rapidly developed, the security lens is taken as an important component, and among various cameras which are in direct contact with human beings, the security camera is one of the most important cameras which are in contact with daily life. The security camera is also an 'eye' of the monitoring system, is an indispensable part of the video monitoring system, and is rapidly developed, and the application field of the security camera is very wide. Along with the increasing complexity of the monitoring environment, the common standard Jiao An security system in the market cannot meet the security requirements of current people, so that the requirement of lens placement is developed from standard definition, fixed focus to high definition and zooming.
The zoom lens changes the focal length of the whole system by moving two or more lens groups in the system, and can realize that the system can obtain continuous and clear images in the whole zooming process on the premise of keeping the image surface unchanged. The zoom lens changes the focal length in a different manner from a fixed focal length lens, and can realize the increase and decrease of the focal length by pushing and pulling or rotating the zoom ring, so that the stepless change of the focal length can be realized within the focal length change range without changing the lens. Because the zoom lens has the characteristics, the zoom lens can meet the requirements of various monitoring scenes, and is more and more favored in the security monitoring market. At present, most of lenses designed by domestic lens enterprises and applied to security protection are fixed focus and zoom ratio below 5 times, which is far insufficient, in order to obtain clear imaging at far and near ends, a monitoring lens is required to have enough zoom ratio, so that the complexity of the lenses in the design process is increased, the cost is correspondingly increased, the cost performance of the lenses is lowered, and the focal length of the high-zoom security protection lens product on the market at present is 50mm at maximum, so that the lens is not suitable for monitoring parking lots and large-scale target places. Therefore, the zoom security lens with high zoom ratio, long focal length and low cost becomes a new development trend.
Disclosure of Invention
In order to overcome the technical problems, the application discloses an 8-time zoom security lens, which can realize high zoom ratio of 8 times, the number of lenses of the zoom security lens in the current market is often 14 or more, the design cost is reduced as much as possible, the zoom security lens is only composed of 12 domestic spherical lenses, the total length is smaller than 220mm, the F number of the lens is 3.5, the angle of view is 3.6-28 degrees, clear imaging from infinity to 4m can be realized, the zoom security lens has a variable focal range of 20-160 mm, the imaging quality of each zoom position is good in the focusing process, and the application scene is suitable for large underground parking lots and other large places in each market.
In order to achieve the above object, the present application provides an 8-fold zoom security lens, wherein the zoom range of the zoom security lens is 20mm to 160mm, the zoom ratio is 8, and the zoom security lens sequentially comprises, along the direction from the object side to the image side of an optical axis: a first fixed lens group having positive optical power, a variable power lens group having negative optical power, a compensation lens group having positive optical power, a diaphragm, a second fixed lens group having negative optical power;
the first fixed lens group has positive focal power and comprises two lenses, namely a first lens and a second lens; the variable magnification lens group has negative focal power and comprises three lenses, namely a third lens, a fourth lens and a fifth lens; the compensating lens group has positive focal power and comprises four lenses, namely a sixth lens, a seventh lens, an eighth lens and a ninth lens; the second fixed lens group has negative focal power and comprises 3 lenses, namely a tenth lens, an eleventh lens and a twelfth lens;
the first fixed lens group and the variable magnification lens group at least comprise one cemented lens;
in the zooming process from the short focal position to the long focal position, the compensation lens group and the variable magnification lens group move along the optical axis, so that the distance between the first fixed lens group and the variable magnification lens group is increased, the distance between the compensation lens group and the second fixed lens group is increased, and the distance between the variable magnification lens group and the compensation lens group is reduced; the zoom security lens meets the following conditional expression: T1/T2 is more than or equal to 2.72 and less than or equal to 3.9; wherein T1 is the moving distance of the zoom lens group, and T2 is the moving distance of the compensation lens group;
the zoom security lens also satisfies the following relation: 5.68< |f/f| <45.5; f is the effective focal length of the zooming security lens, and F is the F-number of the zooming security lens;
the zoom security lens also meets the following conditional expression: 2.05-4.13 Fa/F2; wherein Fa is the focal length of the cemented lens in the variable magnification lens group, and F2 is the focal length of the variable magnification lens group;
the zoom security lens also meets the following conditional expression: F3/F2 is less than or equal to-1.1 and less than or equal to-0.91; wherein F3 is the focal length of the compensation lens group, and F2 is the focal length of the zoom lens group;
the zoom security lens also meets the following conditional expression: F6/F3 is more than or equal to 2.38 and less than or equal to 3.08; wherein F6 is a focal length of the sixth lens, and F3 is a focal length of the compensation lens group.
Further, the first lens has positive optical power.
Further, along the direction from the object side to the image side of the optical axis, the first lens is a convex-convex lens; the second lens is a concave-convex lens.
Further, the fourth lens and the fifth lens have negative optical power.
Further, along the direction from the object side to the image side of the optical axis, the third lens is a convex-convex lens; the fourth lens is a concave lens; the fifth lens is a concave lens.
Further, the sixth lens, the eighth lens, and the ninth lens have positive optical power.
Further, along the direction from the object side to the image side of the optical axis, the sixth lens is a convex-convex lens; the seventh lens is a convex-concave lens; the eighth lens is a convex lens; the ninth lens is a convex lens.
Further, a diaphragm is disposed on a front surface of a tenth lens of the second fixed lens group.
Further, the tenth lens and the eleventh lens have negative optical power.
Further, along the direction from the object side to the image side of the optical axis, the tenth lens is a concave lens; the eleventh lens is a convex-concave lens; the twelfth lens is a convex-convex lens.
According to the scheme of the application, the zoom security lens consists of a first fixed lens group, a second fixed lens group, a positive, negative and negative variable-magnification lens group with focal power in sequence, a total of four lens groups of a positive, negative, positive and positive compensation lens group with focal power in sequence, and a diaphragm arranged on the front surface of a tenth lens in the second fixed lens group. Compared with the prior art, the application has the advantages that:
(1) The specific movement mode among the lens groups and the optimized setting and combination of the number, the focal power and the shape of the lenses in each lens group enable the zoom security lens to be 8 times of high zoom ratio;
(2) The number of lenses of the zoom security lenses in the current market is often 14 or more, the design cost is reduced as much as possible, the zoom security lens consists of only 12 domestic spherical lenses, the total length is less than 220mm, and the zoom security lens has cost performance and miniaturized design;
(3) The zoom lens has a variable focal length range of 20-160 mm, is applicable to large underground parking lots and other large places in various markets by using the scene, and solves the problem of the prior type (long focus and Gao Bianbei ratio) of zoom security lens products on the market.
The system parameters achieved by the application are as follows: the lens F number is 3.5, the angle of view is 3.6-28 degrees, clear imaging from infinity to 4m can be realized, the variable focal length range of 20-160 mm is provided, the MTF is not less than 0.3 when the MTF is 100lp/mm, the disperse spot radius is less than 4.2 mu m, the field curvature is better than 0.06mm, the distortion is better than 3%, the lens F number can be matched with a 1/4 inch CCD image sensor for use, and the application scene is suitable for large-scale underground parking lots and other large-scale places of various markets.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic optical structure diagram of a zoom security lens in a short focal position according to a first embodiment of the present application;
fig. 2 is an MTF diffraction transfer function diagram of the zoom security lens at a short focal position according to the first embodiment of the present application;
fig. 3A-C are root mean square spot size diagrams, field curvature diagrams and distortion diagrams of the zoom security lens at a short focal position according to the first embodiment of the present application;
fig. 4 is a schematic optical structure diagram of a zoom security lens in a middle focal position according to a first embodiment of the present application;
FIG. 5 is a graph of the MTF diffraction transfer function of the zoom security lens at the mid-focal position disclosed in the first embodiment of the present application;
fig. 6A-C are root mean square spot size diagrams, field curvature diagrams and distortion diagrams of the zoom security lens at the middle focal position according to the first embodiment of the present application;
fig. 7 is a schematic optical structure diagram of a zoom security lens in a tele position according to the first embodiment of the present application;
fig. 8 is an MTF diffraction transfer function diagram of the zoom security lens in the tele position according to the first embodiment of the present application;
9A-C are root mean square spot size diagrams, field curvature diagrams and distortion diagrams of a zoom security lens at a tele position disclosed in a first embodiment of the application;
fig. 10 is a schematic optical structure diagram of a zoom security lens in a short focal position according to a second embodiment of the present application;
FIG. 11 is a graph of MTF diffraction transfer function of a zoom security lens in a short focal position according to a second embodiment of the present application;
12A-C are root mean square spot size diagrams, field curvature diagrams and distortion diagrams of a zoom security lens at a short focal position disclosed in a second embodiment of the present application;
fig. 13 is a schematic optical structure diagram of a zoom security lens in a middle focal position according to a second embodiment of the present application;
FIG. 14 is a graph of the MTF diffraction transfer function of a zoom security lens in the mid-focal position, disclosed in a second embodiment of the present application;
15A-C are root mean square spot size diagrams, field curvature diagrams and distortion diagrams of a zoom security lens at a mid-focus position according to a second embodiment of the present application;
fig. 16 is a schematic view of an optical structure of a zoom security lens in a tele position according to a second embodiment of the present application;
FIG. 17 is a graph of MTF diffraction transfer function of a zoom security lens in a tele position, disclosed in a second embodiment of the present application;
fig. 18A-C are a root mean square spot size diagram, a field curvature diagram, and a distortion diagram of a zoom security lens in a tele position according to a second embodiment of the present application.
Detailed Description
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.
The embodiment of the application provides a zoom security lens, which sequentially comprises the following components along the direction from an object side to an image side: the first fixed lens group, the variable magnification lens group, the compensation lens group, the diaphragm positioned on the front surface of the tenth lens in the second fixed lens group, the variable magnification lens group and the compensation lens group can move along the optical axis. The variable power lens group and the second fixed lens group are both lens groups with negative focal power, the first fixed lens group and the compensating lens group are both lens groups with positive focal power, and the diaphragm is positioned on the front surface of a tenth lens in the second fixed lens group.
Therefore, by reasonably distributing the moving modes of the four lens groups and the focal power thereof, the zoom security lens can realize 8 times of zoom ratio, the number of lenses of the zoom security lens in the current market is often 14 or more, the design cost is reduced as much as possible, the zoom security lens consists of only 12 domestic spherical lenses, the total length is smaller than 220mm, the zoom security lens has cost performance and miniaturization design, the zoom security lens has a variable focal length range of 20-160 mm, the application scene is suitable for large-scale underground parking lots and other large-scale places of various markets, and the problem of the type (long focal length and Gao Bianbei ratio) of the zoom security lens products in the current market is solved. The F number of the lens is 3.5, the angle of view is 3.6-28 degrees, clear imaging from infinity to 4m can be realized, the MTF is not less than 0.3 at 100lp/mm, the radius of a diffuse spot is less than 4.2 mu m, the field curvature is better than 0.06mm, the distortion is better than 3%, and the lens can be matched with a 1/4 inch CCD image sensor for use.
In an embodiment of the present application, along a direction from an object side to an image side of an optical axis, a first fixed lens group sequentially includes: a first lens and a second lens. Wherein the first lens is a lens having positive optical power and the second lens is a lens having positive optical power. For the lens shape, the first lens is a convex lens and the second lens is a concave-convex lens along the direction from the object side to the image side of the optical axis.
In an embodiment of the present application, along a direction from an object side to an image side of an optical axis, a magnification-varying lens group includes: a third lens, a fourth lens and a fifth lens. The third lens is a lens having positive optical power, and the fourth and fifth lenses are lenses having negative optical power. For the lens shape, along the direction from the object side to the image side of the optical axis, the third lens is a convex-convex lens, the fourth lens is a concave-concave lens, and the fifth lens is a concave-concave lens or a concave-flat lens. The fifth lens in the first embodiment is a concave lens, and the fifth lens in the second embodiment is a concave lens.
In an embodiment of the present application, along a direction from an object side to an image side of an optical axis, a compensation lens group includes: a sixth lens, a seventh lens, an eighth lens and a ninth lens. Wherein the sixth lens, the eighth lens and the ninth lens are all lenses with positive focal power, and the seventh lens is a lens with negative focal power. For the lens shape, along the direction from the object side to the image side of the optical axis, the sixth lens is a convex lens, the seventh lens is a convex-concave lens, the eighth lens is a convex-convex lens, and the ninth lens is a convex-convex lens.
In an embodiment of the present application, along a direction from an object side to an image side of an optical axis, the second fixed lens group includes: tenth, eleventh, and twelfth lenses. The tenth lens and the eleventh lens are both lenses with negative focal power, and the twelfth lens is a lens with positive focal power. For the lens shape, the tenth lens is a concave-convex lens, the eleventh lens is a convex-concave lens, and the twelfth lens is a convex-convex lens in a direction from the object side to the image side along the optical axis.
The zoom security lens of the present application will be described in detail below by referring to embodiments, specific parameters and accompanying drawings.
First embodiment
As shown in fig. 1, an optical structure diagram of a zoom security lens in a short focal position according to a first embodiment includes, in order along an optical axis from an object side to an image side: the first fixed lens group G1, the variable magnification lens group G2, the compensation lens group G3, the diaphragm located on the front surface of the tenth lens in the second fixed lens group G4, and the second fixed lens group G4, wherein the rightmost broken line in the figure represents the image plane. The first fixed lens group G1 sequentially includes: a first lens (L1) and a second lens (L2); the variable magnification lens group G2 includes: a third lens (L3), a fourth lens (L4), and a fifth lens (L5); the compensation lens group G3 includes: a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), and a ninth lens (L9); the second fixed lens group G4 includes: a tenth lens (L10), an eleventh lens (L11), and a twelfth lens (L12). The variable power lens group G2 and the compensation lens group G3 are movable along the optical axis, wherein the variable power lens group G2 and the second fixed lens group G4 are both lens groups having negative optical power, and the first fixed lens group G1 and the compensation lens group G3 are both lens groups having positive optical power.
As shown in fig. 4, an optical structure diagram of the zoom security lens in the middle focal position according to the first embodiment includes, in order along the direction from the object side to the image side: the first fixed lens group G1, the variable magnification lens group G2, the compensation lens group G3, the diaphragm located on the front surface of the tenth lens in the second fixed lens group G4, and the second fixed lens group G4, wherein the rightmost broken line in the figure represents the image plane. The first fixed lens group G1 sequentially includes: a first lens (L1) and a second lens (L2); the variable magnification lens group G2 includes: a third lens (L3), a fourth lens (L4), and a fifth lens (L5); the compensation lens group G3 includes: a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), and a ninth lens (L9); the second fixed lens group G4 includes: a tenth lens (L10), an eleventh lens (L11), and a twelfth lens (L12). The variable power lens group G2 and the compensation lens group G3 are movable along the optical axis, wherein the variable power lens group G2 and the second fixed lens group G4 are both lens groups having negative optical power, and the first fixed lens group G1 and the compensation lens group G3 are both lens groups having positive optical power.
As shown in fig. 7, an optical structure diagram of the zoom security lens in the first embodiment at the telephoto position includes, in order along the direction from the object side to the image side, the following steps: the first fixed lens group G1, the variable magnification lens group G2, the compensation lens group G3, the diaphragm located on the front surface of the tenth lens in the second fixed lens group G4, and the second fixed lens group G4, wherein the rightmost broken line in the figure represents the image plane. The first fixed lens group G1 sequentially includes: a first lens (L1) and a second lens (L2); the variable magnification lens group G2 includes: a third lens (L3), a fourth lens (L4), and a fifth lens (L5); the compensation lens group G3 includes: a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), and a ninth lens (L9); the second fixed lens group G4 includes: a tenth lens (L10), an eleventh lens (L11), and a twelfth lens (L12). The variable power lens group G2 and the compensation lens group G3 are movable along the optical axis, wherein the variable power lens group G2 and the second fixed lens group G4 are both lens groups having negative optical power, and the first fixed lens group G1 and the compensation lens group G3 are both lens groups having positive optical power.
Short focal position focal length fw=20 mm; mid focal position focal length fz=90 mm, tele focal length ft=160 mm.
In the zooming process from the short-focus position to the medium-focus position, the compensation lens group and the variable-magnification lens group move along the optical axis, so that the distance between the first fixed lens group and the variable-magnification lens group is increased, the distance between the compensation lens group and the second fixed lens group is increased, and the distance between the variable-magnification lens group and the compensation lens group is reduced;
in the zooming process from the middle focal position to the long focal position, the compensation lens group and the zoom lens group move along the optical axis, so that the distance between the first fixed lens group and the zoom lens group is continuously increased, the distance between the compensation lens group and the second fixed lens group is continuously increased, and the distance between the zoom lens group and the compensation lens group is continuously reduced.
Radius of curvature R, thickness d, refractive index Nd, and abbe number Vd of each face of the zoom security lens, see the following table (table 1).
TABLE 1
Wherein, surface 1 is the front surface of the first lens, surface 2 is the bonding surface of the first lens and the second lens, surface 3 is the back surface of the second lens, surface 4 is the front surface of the third lens, surface 5 is the bonding surface of the third lens and the fourth lens, surface 6 is the back surface of the fourth lens, surface 7 and surface 8 are the front and back surfaces of the fifth lens, surface 9 and surface 10 are the front and back surfaces of the sixth lens, surface 11 and surface 12 are the front and back surfaces of the seventh lens, surface 13 and surface 14 are the front and back surfaces of the eighth lens, surface 14 and surface 16 are the front and back surfaces of the ninth lens, surface 17 and surface 18 are the front and back surfaces of the tenth lens, surface 19 and surface 20 are the front and back surfaces of the eleventh lens, and surface 21 and surface 22 are the front and back surfaces of the twelfth lens, respectively.
In the first implementation, when the short focal position of the zoom security lens changes to the long focal position, the values of the intervals between the first fixed lens group and the zoom lens group, the values of the intervals between the zoom lens group and the compensation lens group, and the values of the intervals between the zoom lens group and the second fixed lens group (i.e., D1, D2, and D3 in table 2) are as shown in the following table (table 2):
TABLE 2
The zoom security lens can realize 8 times of zoom ratio, has total length smaller than 220mm, cost performance and miniaturization design, has a variable focal range of 20-160 mm, has F number of 3.5 and angle of view of 3.6-28 degrees, and can realize clear imaging from infinity to 4 m.
The focal length F3 of the compensation lens group and the focal length F2 of the zoom lens group in the zoom security lens meet the following conditional expression: F3/F2 less than or equal to 1.1 less than or equal to-0.91, thereby reasonably distributing the focal power and focal length range of the compensation lens group and the zoom lens group, being beneficial to improving the stability of the optical performance of the zoom security lens in the zooming and focusing process and simultaneously being beneficial to improving the optical performance of the zoom security lens.
The moving distance T1 of the zoom lens group in the zoom security lens and the moving distance T2 of the compensation lens group meet the following conditional expression: 2.72 is less than or equal to T1/T2 is less than or equal to 3.9, thereby limiting the relation of the moving distance of the zoom lens group and the compensating lens group, ensuring that the focusing response speed of the lens is high and the imaging quality is stable in the zooming process, and simultaneously realizing the miniaturization of the zooming security lens.
The first fixed lens group and the variable magnification lens group at least comprise 1 cemented lens, which is beneficial to improving the optical performance of the zoom security lens.
In the zooming process from the short focal position to the long focal position, the compensating lens group and the variable-magnification lens group can move along the optical axis, the distance between the first fixed lens group and the variable-magnification lens group is increased, the distance between the compensating lens group and the second fixed lens group is increased, and the distance between the variable-magnification lens group and the compensating lens group is reduced, so that the zooming security lens can achieve a high zoom ratio of 8 times and a long focal length of 160mm in a moving mode;
the focal length F of the zooming security lens and the F-number of the zooming security lens meet the following conditional expression: 5.68< |f/F| <45.5, so that the zoom security lens can realize a zoom range of 20 mm-160 mm under a certain aperture number, and the focal length of the zoom security lens is improved as much as possible.
The focal length Fa of the cemented lens in the variable magnification lens group and the focal length F2 of the variable magnification lens group satisfy the following relation: fa/F2 is more than or equal to 2.05 and less than or equal to 4.13. Therefore, aberration of the system is corrected, optical performance of the zoom security lens is improved, and assembly tolerance of the two lenses can be reduced by reasonably setting optical power of the glued lenses, so that assembly yield of the zoom security lens is improved.
The focal length F6 of the sixth lens and the focal length F3 of the compensation lens group satisfy the following conditional expression: F6/F3 is more than or equal to 2.38 and less than or equal to 3.08. Therefore, the focal length of the first positive focal power lens and the lens focal length of the first positive focal power lens in the compensation lens group are reasonably distributed, so that the performance of the zooming security lens is improved.
Referring to fig. 2, 5 and 8, fig. 2, 5 and 8 are respectively MTF diffraction transfer function diagrams of the zoom security lens in the first embodiment at a short focal position, a middle focal position and a long focal position, wherein an abscissa along an X-axis direction represents a line pair in mm, and an ordinate along a Y-axis direction represents an MTF diffraction transfer function value, and as can be seen from fig. 2, 5 and 8, the MTF transfer function value of the zoom security lens is not less than 0.3 at the short focal position, the middle focal position and the long focal position, which indicates that the imaging quality of the zoom security lens is good and the imaging quality at each zoom position is kept stable;
referring to fig. 3A, 6A, and 9A, fig. 3A, 6A, and 9A are root mean square radius dimension diagrams of the zoom security lens according to the first embodiment at a short focal position, a middle focal position, and a long focal position, respectively, under a defined visible light wavelength, wherein an abscissa along an X-axis direction represents a relative field of view, and an ordinate along a Y-axis direction represents a root mean square radius dimension in mm, and it can be seen from fig. 3A, 6A, and 9A that the root mean square radius dimension is better than 3um at the short focal position, the middle focal position, and the long focal position, respectively, which indicates that spherical aberration of the zoom security lens is better compensated.
Referring to fig. 3B, 6B, and 9B, fig. 3B, 6B, and 9B are field diagrams of the zoom security lens according to the first embodiment at a short focal position, a middle focal position, and a long focal position, respectively, under a defined visible wavelength, wherein an abscissa along an X-axis direction represents a field curve size in mm, and an ordinate along a Y-axis direction represents a normalized field, and as can be seen from fig. 3B, 6B, and 9B, the field curve of the zoom security lens is better than 0.06mm in both the short focal position, the middle focal position, and the long focal position, which indicates that the field curve of the zoom security lens is better compensated.
Referring to fig. 3C, 6C, and 9C, fig. 3C, 6C, and 9C are respectively distortion diagrams of the zoom security lens in the first embodiment at a short focal position, a middle focal position, and a long focal position at defined visible wavelengths, wherein an abscissa along an X-axis direction represents a distortion magnitude, and an ordinate along a Y-axis direction represents a normalized field of view, and as can be seen from fig. 3C, 6C, and 9C, the distortion of the zoom security lens is better than 3% at the short focal position, the middle focal position, and the long focal position, respectively, which indicates that the distortion of the zoom security lens is well corrected.
Second embodiment
As shown in fig. 10, an optical structure diagram of the zoom security lens in the second embodiment at a short focal position, along the direction from the object side to the image side along the optical axis, sequentially includes: the first fixed lens group G5, the variable magnification lens group G6, the compensation lens group G7, the diaphragm located on the front surface of the tenth lens in the second fixed lens group G8, and the second fixed lens group G8, wherein the rightmost broken line in the figure represents the image plane. The first fixed lens group G5 sequentially includes: a first lens (L13) and a second lens (L14); the variable magnification lens group G6 includes: a third lens (L15), a fourth lens (L16), and a fifth lens (L17); the compensation lens group G7 includes: a sixth lens (L18), a seventh lens (L19), an eighth lens (L20), and a ninth lens (L21); the second fixed lens group G8 includes: a tenth lens (L22), an eleventh lens (L23), and a twelfth lens (L24). The variable power lens group G6 and the compensation lens group G7 are movable along the optical axis, wherein the variable power lens group G6 and the second fixed lens group G8 are both lens groups having negative optical power, and the first fixed lens group G5 and the compensation lens group G7 are both lens groups having positive optical power.
As shown in fig. 13, an optical structure diagram of a zoom security lens in a middle focal position according to a second embodiment includes, in order along an optical axis from an object side to an image side: : the first fixed lens group G5, the variable magnification lens group G6, the compensation lens group G7, the diaphragm located on the front surface of the tenth lens in the second fixed lens group G8, and the second fixed lens group G8, wherein the rightmost broken line in the figure represents the image plane. The first fixed lens group G5 sequentially includes: a first lens (L13) and a second lens (L14); the variable magnification lens group G6 includes: a third lens (L15), a fourth lens (L16), and a fifth lens (L17); the compensation lens group G7 includes: a sixth lens (L18), a seventh lens (L19), an eighth lens (L20), and a ninth lens (L21); the second fixed lens group G8 includes: a tenth lens (L22), an eleventh lens (L23), and a twelfth lens (L24). The variable power lens group G6 and the compensation lens group G7 are movable along the optical axis, wherein the variable power lens group G6 and the second fixed lens group G8 are both lens groups having negative optical power, and the first fixed lens group G5 and the compensation lens group G7 are both lens groups having positive optical power.
As shown in fig. 16, an optical structure diagram of a zoom security lens in a second embodiment at a telephoto position includes, in order along an optical axis from an object side to an image side: : the first fixed lens group G5, the variable magnification lens group G6, the compensation lens group G7, the diaphragm located on the front surface of the tenth lens in the second fixed lens group G8, and the second fixed lens group G8, wherein the rightmost broken line in the figure represents the image plane. The first fixed lens group G5 sequentially includes: a first lens (L13) and a second lens (L14); the variable magnification lens group G6 includes: a third lens (L15), a fourth lens (L16), and a fifth lens (L17); the compensation lens group G7 includes: a sixth lens (L18), a seventh lens (L19), an eighth lens (L20), and a ninth lens (L21); the second fixed lens group G8 includes: a tenth lens (L22), an eleventh lens (L23), and a twelfth lens (L24). The variable power lens group G6 and the compensation lens group G7 are movable along the optical axis, wherein the variable power lens group G6 and the second fixed lens group G8 are both lens groups having negative optical power, and the first fixed lens group G5 and the compensation lens group G7 are both lens groups having positive optical power.
Short focal position focal length fw=20 mm; mid focal position focal length fz=90 mm, tele focal length ft=160 mm.
In the zooming process from the short-focus position to the medium-focus position, the compensation lens group and the zoom lens group can move along the optical axis, the distance between the first fixed lens group and the zoom lens group is increased, the distance between the compensation lens group and the second fixed lens group is increased, and the distance between the zoom lens group and the compensation lens group is reduced;
in the zooming process from the middle focal position to the long focal position, the compensation lens group and the zoom lens group can move along the optical axis, the distance between the first fixed lens group and the zoom lens group continues to increase, the distance between the compensation lens group and the second fixed lens group continues to increase, and the distance between the zoom lens group and the compensation lens group continues to decrease.
The radius of curvature R, thickness d, refractive index Nd, and Abbe number Vd of each surface of the zoom security lens are shown in the following table (Table 3)
TABLE 3 Table 3
Wherein, surface 1 is the front surface of the first lens, surface 2 is the bonding surface of the first lens and the second lens, surface 3 is the back surface of the second lens, surface 4 is the front surface of the third lens, surface 5 is the bonding surface of the third lens and the fourth lens, surface 6 is the back surface of the fourth lens, surface 7 and surface 8 are the front and back surfaces of the fifth lens, surface 9 and surface 10 are the front and back surfaces of the sixth lens, surface 11 and surface 12 are the front and back surfaces of the seventh lens, surface 13 and surface 14 are the front and back surfaces of the eighth lens, surface 14 and surface 16 are the front and back surfaces of the ninth lens, surface 17 and surface 18 are the front and back surfaces of the tenth lens, surface 19 and surface 20 are the front and back surfaces of the eleventh lens, and surface 21 and surface 22 are the front and back surfaces of the twelfth lens, respectively.
In the second embodiment, when the short focal position of the zoom security lens changes to the long focal position, the values of the intervals between the first fixed lens group and the zoom lens group, the values of the intervals between the zoom lens group and the compensation lens group, and the values of the intervals between the zoom lens group and the second fixed lens group (i.e., D1, D2, and D3 in table 4) are shown in the following table (table 4):
TABLE 4 Table 4
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The zoom security lens can realize 8 times of zoom ratio, has total length smaller than 220mm, cost performance and miniaturization design, has a variable focal range of 20-160 mm, has F number of 3.5 and angle of view of 3.6-28 degrees, and can realize clear imaging from infinity to 4 m.
The focal length F3 of the compensation lens group and the focal length F2 of the zoom lens group in the zoom security lens meet the following conditional expression: F3/F2 less than or equal to 1.1 less than or equal to-0.91, thereby reasonably distributing the focal power and focal length range of the compensation lens group and the zoom lens group, being beneficial to improving the stability of the optical performance of the zoom security lens in the zooming and focusing process and simultaneously being beneficial to improving the optical performance of the zoom security lens.
The moving distance T1 of the zoom lens group in the zoom security lens and the moving distance T2 of the compensation lens group meet the following conditional expression: 2.72 is less than or equal to T1/T2 is less than or equal to 3.9, thereby limiting the relation of the moving distance of the zoom lens group and the compensating lens group, ensuring that the focusing response speed of the lens is high and the imaging quality is stable in the zooming process, and simultaneously realizing the miniaturization of the zooming security lens.
The first fixed lens group and the variable magnification lens group at least comprise 1 cemented lens, which is beneficial to improving the optical performance of the zoom security lens.
In the zooming process from the short focal position to the long focal position, the compensating lens group and the variable-magnification lens group can move along the optical axis, the distance between the first fixed lens group and the variable-magnification lens group is increased, the distance between the compensating lens group and the second fixed lens group is increased, and the distance between the variable-magnification lens group and the compensating lens group is reduced, so that the zooming security lens can achieve a high zoom ratio of 8 times and a long focal length of 160mm in a moving mode;
the focal length F of the zooming security lens and the F-number of the zooming security lens meet the following conditional expression: 5.68< |f/F| <45.5, so that the zoom security lens can realize a zoom range of 20 mm-160 mm under a certain aperture number, and the focal length of the zoom security lens is improved as much as possible.
The focal length Fa of the cemented lens in the variable magnification lens group and the focal length F2 of the variable magnification lens group satisfy the following relation: fa/F2 is more than or equal to 2.05 and less than or equal to 4.13. Therefore, aberration of the system is corrected, optical performance of the zoom security lens is improved, and assembly tolerance of the two lenses can be reduced by reasonably setting optical power of the glued lenses, so that assembly yield of the zoom security lens is improved.
The focal length F6 of the sixth lens and the focal length F3 of the compensation lens group satisfy the following conditional expression: F6/F3 is more than or equal to 2.38 and less than or equal to 3.08. Therefore, the focal length of the first positive focal power lens and the lens focal length of the first positive focal power lens in the compensation lens group are reasonably distributed, so that the performance of the zooming security lens is improved.
Referring to fig. 11, 14 and 17, fig. 11, 14 and 17 are MTF diffraction transfer function diagrams of the zoom security lens in the second embodiment at a short focal position, a middle focal position and a long focal position respectively, wherein an abscissa along an X-axis direction represents a line pair in mm, and an ordinate along a Y-axis direction represents an MTF diffraction transfer function value, and as can be seen from fig. 11, 14 and 17, the MTF transfer function value of the zoom security lens is not less than 0.3 at the short focal position, the middle focal position and the long focal position, which indicates that the imaging quality of the zoom security lens is good and the imaging quality at each zoom position is kept stable;
referring to fig. 12A, 15A, 18A, fig. 12A, 15A, 18A are root mean square radius dimension diagrams of the zoom security lens in the second embodiment at the short focal position, the middle focal position, and the long focal position, respectively, under the defined visible light wavelength, wherein the abscissa along the X-axis represents the relative field of view, and the ordinate along the Y-axis represents the root mean square radius dimension in mm, and it can be seen from fig. 12A, 15A, 18A that under the visible light wavelength, the root mean square radius dimension of the zoom security lens is better than 3um, which indicates that the spherical aberration of the zoom security lens is better compensated.
Referring to fig. 12A, 15A, 18A, fig. 12A, 15A, 18A are field diagrams of the zoom security lens in the second embodiment at a short focal position, a middle focal position, and a long focal position, respectively, under a defined visible wavelength, wherein an abscissa along an X-axis direction represents a field curve size in mm, and an ordinate along a Y-axis direction represents a normalized field, and as can be seen from fig. 12A, 15A, 18A, the field curve of the zoom security lens is better than 0.66mm in both the short focal position, the middle focal position, and the long focal position, which indicates that the field curve of the zoom security lens is better compensated.
Referring to fig. 12C, 15C, 18C, fig. 12C, 15C, 18C are distortion diagrams of the zoom security lens in the second embodiment at the short focal position, the middle focal position, and the long focal position, respectively, under the defined visible light wavelength, wherein the abscissa along the X-axis direction represents the distortion magnitude, and the ordinate along the Y-axis direction represents the normalized field of view, and as can be seen from fig. 12C, 15C, 18C, the distortion of the zoom security lens is better than 2.6% at the short focal position, the middle focal position, or the long focal position, which indicates that the distortion of the zoom security lens is well corrected.
The technical effect of the application is to provide an 8-time zoom security lens, which can realize 8-time high zoom ratio, the number of lenses of the zoom security lens in the current market is often 14 or more, the application reduces the design cost as much as possible, the application is only composed of 12 domestic spherical lenses, clear imaging from infinity to 4m can be realized, the zoom range of 20 mm-160 mm is provided, MTF is not less than 0.3 at 100lp/mm, the radius of diffuse spots is less than 4.2 mu m, field curvature is better than 0.06mm, distortion is better than 3%, imaging quality is good, the application can be used with 1/4 inch CCD image sensor, and the application scene is suitable for large underground parking lots and other large places in various markets.
The description of the embodiments of the specification should be taken in conjunction with the accompanying drawings, which are a complete description of the embodiments. Any references to directions and orientations in the above description of the embodiments are for convenience of description only and are not to be construed as limiting the scope of the application. The description of the preferred embodiments will refer to combinations of features, which may be present alone or in combination, and the present application is not particularly limited to the preferred embodiments, but the description of the above embodiments is merely for aiding in understanding the optical lens and the design core ideas thereof; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present application, the present disclosure should not be construed as limiting the present application in summary. The scope of the application is defined by the claims.
Claims (10)
1. The utility model provides a 8 times security protection camera lens zooms, its characterized in that, the zoom scope of security protection camera lens zooms 20mm ~ 160mm, and the zoom ratio is 8, the security protection camera lens zooms along the optical axis from object side to the direction of image side, includes in proper order: a first fixed lens group having positive optical power, a variable power lens group having negative optical power, a compensation lens group having positive optical power, a diaphragm, a second fixed lens group having negative optical power;
the first fixed lens group has positive focal power and comprises two lenses, namely a first lens and a second lens; the variable magnification lens group has negative focal power and comprises three lenses, namely a third lens, a fourth lens and a fifth lens; the compensating lens group has positive focal power and comprises four lenses, namely a sixth lens, a seventh lens, an eighth lens and a ninth lens; the second fixed lens group has negative focal power and comprises 3 lenses, namely a tenth lens, an eleventh lens and a twelfth lens;
the first fixed lens group and the variable magnification lens group at least comprise one cemented lens;
in the zooming process from the short focal position to the long focal position, the compensation lens group and the variable magnification lens group move along the optical axis, so that the distance between the first fixed lens group and the variable magnification lens group is increased, the distance between the compensation lens group and the second fixed lens group is increased, and the distance between the variable magnification lens group and the compensation lens group is reduced; the zoom security lens meets the following conditional expression: T1/T2 is more than or equal to 2.72 and less than or equal to 3.9; wherein T1 is the moving distance of the zoom lens group, and T2 is the moving distance of the compensation lens group;
the zoom security lens also satisfies the following relation: 5.68< |f/f| <45.5; f is the effective focal length of the zooming security lens, and F is the F-number of the zooming security lens;
the zoom security lens also meets the following conditional expression: 2.05-4.13 Fa/F2; wherein Fa is the focal length of the cemented lens in the variable magnification lens group, and F2 is the focal length of the variable magnification lens group;
the zoom security lens also meets the following conditional expression: F3/F2 is less than or equal to-1.1 and less than or equal to-0.91; wherein F3 is the focal length of the compensation lens group, and F2 is the focal length of the zoom lens group;
the zoom security lens also meets the following conditional expression: F6/F3 is more than or equal to 2.38 and less than or equal to 3.08; wherein F6 is a focal length of the sixth lens, and F3 is a focal length of the compensation lens group.
2. The zoom security lens of claim 1, wherein the first lens has positive optical power.
3. The zoom security lens according to claim 1, wherein the first lens is a convex lens in a direction from an object side to an image side along an optical axis; the second lens is a concave-convex lens.
4. The zoom security lens of claim 1, wherein the fourth lens and the fifth lens have negative optical power.
5. The zoom security lens according to claim 1, wherein the third lens is a convex lens, the fourth lens is a concave lens, and the fifth lens is a concave lens or a concave plano lens in a direction from an object side to an image side along an optical axis.
6. The zoom security lens of claim 1, wherein the sixth lens, the eighth lens, and the ninth lens have positive optical power.
7. The zoom security lens according to claim 1, wherein the sixth lens is a convex lens in a direction from an object side to an image side along an optical axis; the seventh lens is a convex-concave lens; the eighth lens is a convex lens; the ninth lens is a convex lens.
8. The zoom security lens of claim 1, wherein a stop is disposed on a front surface of a tenth lens of the second fixed lens group.
9. The zoom security lens of claim 1 wherein the tenth lens and the eleventh lens have negative optical power.
10. The zoom security lens according to claim 1, wherein the tenth lens is a concave lens in a direction from an object side to an image side along an optical axis; the eleventh lens is a convex-concave lens; the twelfth lens is a convex-convex lens.
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| US5859729A (en) * | 1996-01-06 | 1999-01-12 | Canon Kabushiki Kaisha | Zoom lens device with four lens unit |
| US5973836A (en) * | 1994-10-14 | 1999-10-26 | Minolta Co., Ltd. | Optical system having an optical system shake compensating function |
| JP2006085155A (en) * | 2004-08-19 | 2006-03-30 | Canon Inc | Zoom lens and imaging apparatus having the same |
| CN101666905A (en) * | 2009-09-30 | 2010-03-10 | 福州开发区鸿发光电子技术有限公司 | Large-zoom ratio optical zoom lens |
| CN103901588A (en) * | 2012-12-27 | 2014-07-02 | 株式会社腾龙 | Zoom lens and camera device |
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| US5973836A (en) * | 1994-10-14 | 1999-10-26 | Minolta Co., Ltd. | Optical system having an optical system shake compensating function |
| US5859729A (en) * | 1996-01-06 | 1999-01-12 | Canon Kabushiki Kaisha | Zoom lens device with four lens unit |
| JP2006085155A (en) * | 2004-08-19 | 2006-03-30 | Canon Inc | Zoom lens and imaging apparatus having the same |
| CN101666905A (en) * | 2009-09-30 | 2010-03-10 | 福州开发区鸿发光电子技术有限公司 | Large-zoom ratio optical zoom lens |
| CN103901588A (en) * | 2012-12-27 | 2014-07-02 | 株式会社腾龙 | Zoom lens and camera device |
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