CN108519663B - Zoom lens - Google Patents
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- CN108519663B CN108519663B CN201810193931.6A CN201810193931A CN108519663B CN 108519663 B CN108519663 B CN 108519663B CN 201810193931 A CN201810193931 A CN 201810193931A CN 108519663 B CN108519663 B CN 108519663B
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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
- G02B15/177—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
Abstract
The invention discloses a zoom lens, which is used for solving the problem that a fixed-focus lens is inconvenient to use. The lens comprises a filter, an imaging surface, a first lens group, a second lens group and a third lens group which are sequentially arranged from an object side to an image side; the total focal power of the first lens group is negative, the total focal power of the second lens group is positive, the total focal power of the third lens group is positive, and zooming is performed by moving the first lens group and the third lens group relative to the second lens group; the focal length fg of the lens group, the system focal length fw of the zoom lens in the short-focus state and the system focal length ft of the zoom lens in the long-focus state satisfy the relation: 2.39-1.99 of fg 1/fw; fg2/fw is not less than 9.44 and not more than 11.44; -1. ltoreq. fg1/fg 3. ltoreq. 0.6; ft/fw is more than or equal to 2 and less than or equal to 5; wherein "-" indicates that the direction is negative. A zoom lens is provided, which provides convenience for life, security or other uses of a user.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a zoom lens.
Background
The security monitoring system is a new industry which is increasingly valued by people, and is more and more popular in application and higher in technology content in terms of current development. Personal safety and property safety in various fields need to be protected. With the progress of modern high and new technologies and the improvement of people's precaution consciousness, various safety technology precautionary facilities come into play. Common security monitoring lenses are all fixed focus lenses, the field angle is constant and unchangeable, and the security monitoring lenses cannot be used in various complex monitoring scenes.
The lens in the camera is the most important part in the camera, and the quality of the lens directly affects the imaging quality. In general, a fixed focus lens is used in a camera, but the angle of view of the fixed focus lens is invariable, and a user needs to zoom when shooting a distant or close object. When the user uses the fixed-focus lens, the zooming basically leans to the side. When the fixed-focus lens is used for shooting images, the fixed-focus lens is sometimes not sensitive enough and is not suitable for subject matters which may have emergencies, such as news photography, reality photography and the like.
In summary, there is a need for a zoom lens that facilitates user usage, security monitoring, and other uses.
Disclosure of Invention
The embodiment of the invention discloses a zoom lens, which is used for solving the problem that a fixed-focus lens in the prior art is inconvenient to use.
In order to achieve the above object, an embodiment of the present invention discloses a zoom lens, including an optical filter and an image plane, the zoom lens further including: the first lens group, the second lens group and the third lens group are sequentially arranged from an object side to an image side;
the total focal power of the first lens group is negative, the total focal power of the second lens group is positive, the total focal power of the third lens group is positive, and zooming is performed by moving the first lens group and the third lens group relative to the second lens group;
wherein a focal length fg1 of the first lens group, a focal length fg2 of the second lens group, a focal length fg3 of the third lens group, a system focal length fw of the zoom lens in a short focus state and a system focal length ft of the zoom lens in a long focus state satisfy the relation:
-2.39≤fg1/fw≤-1.99；
9.44≤fg2/fw≤11.44；
-1≤fg1/fg3≤-0.6；
ft/fw is more than or equal to 2 and less than or equal to 5; wherein "-" indicates that the direction is negative.
Further, the first lens group includes: the lens comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object side to an image side;
the first lens is a meniscus glass lens with negative focal power; the convex surface of the first lens faces to the object space;
the second lens and the third lens form a cemented lens group, and the focal power of the cemented lens group is positive;
the fourth lens is a negative focal power glass lens, and the surface of the fourth lens facing the object space is a concave surface.
Further, the focal length f4 of the fourth lens satisfies: f4/fw is not less than 4.63 and not more than-3.83; wherein "-" indicates that the direction is negative.
Further, the second lens group includes: a fifth lens;
the fifth lens is a positive focal power glass lens, and the surface of the fifth lens facing the object space is a convex surface.
Further, an abbe number Vd5 of the fifth lens satisfies: vd5 is more than or equal to 80.
Further, the third lens group includes: a sixth lens, a seventh lens group, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens arranged in this order from the object side to the image side;
the sixth lens is a positive focal power glass lens;
the seventh lens and the fourteenth lens are meniscus glass lenses with negative focal power;
the eighth lens, the tenth lens, the eleventh lens and the thirteenth lens are double-convex glass lenses with positive focal power;
the ninth lens and the twelfth lens are double concave glass lenses with negative focal power;
the surfaces of the sixth lens and the seventh lens, which face the object side, are convex surfaces; the surface of the fourteenth lens facing the object side is a concave surface.
Further, the curvature radius of the surface of the seventh lens facing the image space and the curvature radius of the surface of the eighth lens facing the object space have the same value;
the curvature radius of the surface of the ninth lens facing the image space and the curvature radius of the surface of the tenth lens facing the object space have the same value.
Further, the air conditioner is provided with a fan,
the seventh lens and the eighth lens form a cemented lens group;
and the ninth lens and the tenth lens form a cemented lens group.
Further, the air conditioner is provided with a fan,
an abbe number Vd8 of the eighth lens satisfies: vd8 is more than or equal to 65;
an abbe number Vd10 of the tenth lens satisfies: vd10 is more than or equal to 65;
the refractive index nd6 of the sixth lens satisfies: nd6 is more than or equal to 1.9;
the refractive index nd11 of the eleventh lens satisfies: nd11 is more than or equal to 1.9.
Further, an aperture diaphragm is arranged between the first lens group and the second lens group.
The embodiment of the invention discloses a zoom lens, which comprises an optical filter and an imaging surface, and further comprises: the first lens group, the second lens group and the third lens group are sequentially arranged from an object side to an image side; the total focal power of the first lens group is negative, the total focal power of the second lens group is positive, the total focal power of the third lens group is positive, and zooming is performed by moving the first lens group and the third lens group relative to the second lens group; wherein a focal length fg1 of the first lens group, a focal length fg2 of the second lens group, a focal length fg3 of the third lens group, a system focal length fw of the zoom lens in a short focus state and a system focal length ft of the zoom lens in a long focus state satisfy the relation: 2.39-1.99 of fg 1/fw; fg2/fw is not less than 9.44 and not more than 11.44; -1. ltoreq. fg1/fg 3. ltoreq. 0.6; ft/fw is more than or equal to 2 and less than or equal to 5; wherein "-" indicates that the direction is negative. In the embodiment of the invention, the first lens group and the third lens group in the zoom lens move relative to the second lens group to zoom, the focal powers of the first lens group and the third lens group are positive, and the formula is satisfied, so that the zoom lens with large image surface, large aperture and good imaging quality is provided, and convenience is provided for life, security protection or other uses of users.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a zoom lens provided in embodiment 1 of the present invention;
FIG. 2 is a zoom lens according to an embodiment of the present invention;
FIG. 3 is a zoom lens according to an embodiment of the present invention;
FIG. 4A is a graph of a modulation transfer function according to an embodiment of the present invention;
FIG. 4B is a graph of a modulation transfer function according to an embodiment of the present invention;
FIG. 5A is a graph of a midday field according to an embodiment of the present invention;
FIG. 5B is a graph of a midday field according to an embodiment of the present invention;
fig. 6A is a graph of axial chromatic aberration provided by an embodiment of the present invention;
fig. 6B is a graph of axial chromatic aberration provided by an embodiment of the present invention;
FIG. 7A is a vertical axis chromatic aberration diagram according to an embodiment of the present invention;
fig. 7B is a vertical axis chromatic aberration curve chart according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
fig. 1 is a schematic view of a zoom lens according to embodiment 1 of the present invention, where the zoom lens includes an optical filter and an image plane, and the zoom lens includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged in this order from the object side to the image side;
the total focal power of the first lens group is negative, the total focal power of the second lens group is positive, the total focal power of the third lens group is positive, and the first lens group and the third lens group can move relative to the second lens group for zooming;
wherein a focal length fg1 of the first lens group, a focal length fg2 of the second lens group, a focal length fg3 of the third lens group, a system focal length fw of the zoom lens in a short focus state and a system focal length ft of the zoom lens in a long focus state satisfy the relation:
-2.39≤fg1/fw≤-1.99；
9.44≤fg2/fw≤11.44；
-1≤fg1/fg3≤-0.6；
ft/fw is more than or equal to 2 and less than or equal to 5; wherein "-" indicates that the direction is negative.
In an embodiment of the present invention, the zoom lens includes a first lens group, a second lens group, a third lens group, an optical filter, and an imaging surface, which are arranged in order from an object side to an image side.
The lens is a zoom lens, zooming can be realized by changing the position of the lens group, zooming can be realized by changing the position of the first lens group relative to the second lens group, zooming can be realized by changing the position of the third lens group relative to the second lens group, zooming can be realized by simultaneously changing the position of the first lens group relative to the second lens group and zooming can be realized by changing the position of the third lens group relative to the second lens group. That is, the position of the second lens group is unchanged, the first lens group may be close to or distant from the second lens group, and the third lens group may be close to or distant from the second lens group.
Each lens group has corresponding focal power, called total focal power, in order to enable normal imaging, the total focal power of the first lens group is negative, the total focal power of the second lens group is positive, and the total focal power of the third lens group is positive.
The zoom lens can be changed between a telephoto state and a short focus state, as shown in fig. 1, the zoom lens being in the short focus state, the first lens group and the third lens group being both distant from the second lens group.
When the zoom lens is in a long focus state, the first lens group and the third lens group are close to the second lens group.
In order to provide a zoom lens with a large image plane, a large aperture and good imaging quality, the focal length fg1 of the first lens group, the focal length fg2 of the second lens group and the focal length fg3 of the third lens group satisfy the following relations:
-2.39≤fg1/fw≤-1.99；
9.44≤fg2/fw≤11.44；
-1. ltoreq. fg1/fg 3. ltoreq. 0.6; wherein "-" indicates that the direction is negative. fg1 denotes a focal length of the first lens group, fg2 denotes a focal length of the second lens group, fg3 denotes a focal length of the third lens group, and fw denotes a system focal length of the zoom lens in a short focal state.
The zoom lens has a system focal length corresponding to the zoom lens in a long-focus state and a system focal length corresponding to the zoom lens in a short-focus state. The following relation is specifically satisfied: ft/fw is more than or equal to 2 and less than or equal to 5; fw represents a system focal length of the zoom lens in a short focus state, and ft represents a system focal length of the zoom lens in a long focus state.
In the embodiment of the invention, the first lens group and the third lens group in the zoom lens move relative to the second lens group to zoom, the focal power of the first lens group and the focal power of the third lens group are positive, the focal power of the second lens group is negative, and the above formula is satisfied.
Example 2:
on the basis of the above embodiments, in the embodiment of the present invention, as shown in fig. 2, the first lens group G1 includes four lenses, specifically, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4, which are arranged in order from the object side to the image side;
the first lens is a meniscus glass lens with negative focal power; the convex surface of the first lens faces to the object space;
the second lens and the third lens form a cemented lens group, and the focal power of the cemented lens group is positive;
the fourth lens is a negative focal power glass lens, and the surface of the fourth lens facing the object space is a concave surface.
One of the second lens and the third lens can be a double-convex glass lens, and the other one can be a double-concave glass lens; or, one of the second lens and the third lens can be a plano-convex glass lens, and the other one can be a plano-concave glass lens. On the premise that the second lens and the third lens can form a cemented lens group, and the power of the cemented lens group is positive, which surface of the second lens and the third lens faces the object side and which surface faces the image side is believed to be well known to those skilled in the art and will not be described in detail herein.
As shown in fig. 2, the second lens is a biconcave lens, and the third lens is a biconvex lens.
The focal power of the fourth lens is negative, the fourth lens can be a double-concave negative focal power lens or a plano-concave negative focal power glass lens, and the concave surface of the fourth lens faces the object space.
As shown in fig. 2, the fourth lens is a biconcave lens.
The focal length f4 of the fourth lens satisfies: f4/fw is not less than 4.63 and not more than-3.83; wherein "-" indicates that the direction is negative.
Because the fourth lens is a biconcave lens or a plano-concave lens; and the concave surface faces the object space, the size of the first lens group is effectively reduced, and the size of the whole zoom lens is further reduced.
Example 3:
on the basis of the above-described embodiments, in an embodiment of the present invention, the second lens group G2 includes: a fifth lens L5; the fifth lens is a positive focal power glass lens, and the surface of the fifth lens facing the object space is a convex surface.
The abbe number Vd5 of the fifth lens satisfies: vd5 is more than or equal to 80.
The fifth lens may be a double convex lens, a meniscus lens, or a plano-convex lens. The convex surface of the fifth lens faces the object side, and in fig. 2, the fifth lens is a biconvex lens. A meniscus lens may be understood as a meniscus lens.
Example 4:
on the basis of the above embodiments, in an embodiment of the present invention, as shown in fig. 2, the third lens group G3 includes: a sixth lens L6, a seventh lens group L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, and a fourteenth lens L14, which are arranged in this order from the object side to the image side;
the sixth lens is a positive focal power glass lens;
the seventh lens and the fourteenth lens are meniscus glass lenses with negative focal power;
the eighth lens, the tenth lens, the eleventh lens and the thirteenth lens are double-convex glass lenses with positive focal power;
the ninth lens and the twelfth lens are double concave glass lenses with negative focal power;
the surfaces of the sixth lens and the seventh lens, which face the object side, are convex surfaces; the surface of the fourteenth lens facing the object side is a concave surface.
In the embodiment of the present invention, the third lens group G3 includes nine lenses, and the sixth lens L6 to the fourteenth lens L14 shown in fig. 2 are arranged in order from the object side to the image side.
The sixth lens L6 is a positive power glass lens, and may be a meniscus lens, a concave-flat lens, a double-convex lens, and has a convex surface facing the object;
the seventh lens L7 is a meniscus negative power glass lens, and the convex surface of the seventh lens faces the object space;
the eighth lens L8 is a double-convex positive power glass lens;
the ninth lens L9 is a biconcave negative power glass lens;
the tenth lens L10 is a double-convex positive power glass lens;
the eleventh lens L11 is a double-convex positive power glass lens;
the twelfth lens L12 is a biconcave negative power glass lens;
the thirteenth lens L13 is a double-convex positive power glass lens;
the fourteenth lens L14 is a meniscus negative power glass lens, and its concave surface faces the object side.
In order to reduce the volume of the zoom lens and make the imaging quality better, the curvature radius of the surface of the seventh lens facing the image space and the curvature radius of the surface of the eighth lens facing the object space have the same value;
the curvature radius of the surface of the ninth lens facing the image side and the curvature radius of the surface of the tenth lens facing the object side have the same value.
Further, the seventh lens and the eighth lens form a cemented lens group; and the ninth lens and the tenth lens form a cemented lens group.
Each lens has an abbe number corresponding to the lens, denoted by Vd, and the abbe number Vd8 of the eighth lens satisfies: vd8 is more than or equal to 65; the abbe number Vd10 of the tenth lens satisfies: vd10 is more than or equal to 65.
Each lens has its corresponding refractive index, denoted as nd, and the refractive index nd6 of the sixth lens satisfies: nd6 is more than or equal to 1.9; the refractive index nd11 of the eleventh lens satisfies: nd11 is more than or equal to 1.9.
Example 5:
in order to control the aperture and position of the light beam entering the zoom lens, as shown in fig. 2, an aperture STOP (STOP) is disposed between the first lens group and the second lens group. That is, an aperture stop is disposed between the fourth lens and the fifth lens.
In summary, the zoom lens shown in fig. 2 includes 14 lenses, and realizes a zoom lens with an ultra-large image plane, a large aperture and a high resolution, where fig. 2 is a schematic diagram of the zoom lens in a short-focus state, and fig. 3 is a schematic diagram of the zoom lens in a long-focus state.
Example 6:
on the basis of the above embodiments, in the embodiment of the present invention, as shown in fig. 2, each lens has two corresponding surfaces, which may be concave, convex, or planar. In particular, the method comprises the following steps of,
the first lens L1 includes a convex surface 1 facing the object side and a concave surface 2 facing the image side;
the second lens L2 includes a concave surface 3 facing the object side and a concave surface 4 facing the image side;
the third lens L3 includes a convex surface 5 facing the object side and a convex surface 6 facing the image side;
the fourth lens L4 includes a concave surface 7 facing the object side and a concave surface 8 facing the image side;
the fifth lens L5 includes a convex surface 9 facing the object side and a convex surface 10 facing the image side; the convex surface 9 is a surface corresponding to an aperture STOP (STOP);
the sixth lens L6 includes a convex surface 11 facing the object side and a concave surface 12 facing the image side;
the seventh lens L7 includes a convex surface 13 facing the object side and a concave surface 14 facing the image side;
the eighth lens L8 includes a convex surface 15 facing the object side and a convex surface 16 facing the image side;
the ninth lens L9 includes a concave surface 17 facing the object side and a concave surface 18 facing the image side;
the tenth lens L10 includes a convex surface 19 facing the object side and a convex surface 20 facing the image side;
the eleventh lens L11 includes a convex surface 21 facing the object side and a convex surface 22 facing the image side;
the twelfth lens L12 includes a concave surface 23 facing the object side and a concave surface 24 facing the image side;
the thirteenth lens L13 includes a convex surface 25 facing the object side and a convex surface 26 facing the image side;
the fourteenth lens L14 includes a concave surface 27 facing the object side and a convex surface 28 facing the image side;
the filter comprises an object-side facing surface 29 and an image-side facing surface 30.
Each surface of each lens has its corresponding Radius of curvature Radius, the distance between the center points of two adjacent surfaces is called the center Thickness, and in addition to the focal length f, refractive index nd and abbe constant Vd of each lens described in the above embodiments, other lenses also have their corresponding various parameter information, i.e., Radius of curvature R, center Thickness Tc from the current surface to the next adjacent surface, refractive index nd and abbe constant Vd information. The following table 1 is specifically provided:
TABLE 1
In table 1, W represents a short focal length state, and T represents a long focal length state.
As shown in table 1, "-" in the curvature radius indicates that the direction of the curvature radius is negative, and "-" in the focal length indicates that the direction of the focal length is negative, and taking the first lens as an example, in table 1, the refractive index of the first lens is 1.804, the abbe constant is 46.503, the center thickness from the surface 1 to the surface 2 of the first lens is 1.82mm, the curvature radius of the surface 1 (convex surface) is 119.605, and the curvature radius of the curved surface 2 (concave surface) is 25.203.
In the short focus state, the center thickness of the surface 8 (concave surface) of the fourth lens facing the image side to the surface 9 (convex surface) of the 5 th lens facing the object side is 35.28 mm; in the telephoto state, the central thickness from the surface 8 (concave surface) of the fourth lens facing the image side to the surface 9 (convex surface) of the 5 th lens facing the object side is 3.4 mm.
The parameters corresponding to other lenses can be referred to table 1, and are not described herein again.
According to the above description, the total optical length TTL of the zoom lens is: 154.9 mm;
the system focal length fw of the zoom lens in a short-focus state is 12 mm; the system focal length ft of the zoom lens in a telephoto state is 36 mm; namely, the system focal length of the zoom lens is between 12mm and 36 mm.
The field angle of the zoom lens in a short-focus state is 110.7 degrees, and the field angle of the zoom lens in a long-focus state is 36.5 degrees; namely, the field angle of the zoom lens is between 110.7 ° and 36.5 °.
The aperture (F/#) of the zoom lens in the short-focus state is 1.5, and in the long-focus state, the aperture of the zoom lens is 2.8, namely the aperture of the zoom lens is between 1.5 and 2.8;
the size of the lens image surface of the zoom lens is as follows: 4/3'.
The zoom lens provided by the present embodiment is further described below by analyzing the zoom lens in detail.
Modulation Transfer Function (MTF) is a more accurate, intuitive and common way to evaluate the imaging quality of a zoom lens, and the higher and smoother curve indicates the better imaging quality of the lens, for various aberrations such as: spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like are well corrected.
As shown in fig. 4A, a Modulation Transfer Function (MTF) graph of the zoom lens in the short focus state in the visible light band is shown. As is clear from fig. 4A, the MTF curve in the visible light portion of the zoom lens in the short focus state is relatively smooth and concentrated, and the average MTF value in the full field of view (half-image height Y' 11mm) is 0.65 or more.
As shown in fig. 4B, a Modulation Transfer Function (MTF) graph of the zoom lens in the telephoto state in the visible light band is shown. As is clear from fig. 4B, the MTF curve in the visible light portion of the zoom lens in the telephoto state is relatively smooth and concentrated, and the average MTF value in the full field of view (half-image height Y' 11mm) is 0.6 or more.
T and S in fig. 4A and 4B are three curves T and S corresponding to the visible light portion, which are described in the following fig. 5A and 5B.
It can be seen that the zoom lens provided by the embodiment of the invention can achieve very high resolution, and meets the imaging requirement of an 4/3-inch 1200-ten-thousand-pixel camera.
The field curve diagram corresponding to the visible light part of the zoom lens consists of three curves T and three curves S; wherein, the three curves T respectively represent the aberration of the meridional beams (tagential Rays) corresponding to the three wavelengths (486nm, 587nm and 656nm), the three curves S respectively represent the aberration of the sagittal beams (Sagittial Rays) corresponding to the three wavelengths (486nm, 587nm and 656nm), and the smaller the meridional field curvature value and the sagittal field curvature value are, the better the imaging quality is.
As shown in FIG. 5A, the meridional curvature of field of the zoom lens in a short-focus state is controlled within the range of-0.038-0.075 mm, and the sagittal curvature of field is controlled within the range of-0.01-0.075 mm.
As shown in FIG. 5B, the meridional curvature of field of the zoom lens in the telephoto state is controlled within a range of 0.03-0.09 mm, and the sagittal curvature of field is controlled within a range of-0.015-0.09 mm.
The axial chromatic aberration diagram corresponding to the visible light part of the zoom lens has the curve changed near the y axis, and the closer to the y axis, the better the imaging quality of the zoom lens is.
As shown in FIG. 6A, the axial chromatic aberration of the zoom lens in the short focus state is controlled between-0.02 and +0.07 mm;
as shown in FIG. 6B, the axial chromatic aberration of the zoom lens in the telephoto state is controlled to be between-0.08 and +0.09 mm.
The vertical axis chromatic aberration diagram corresponding to the visible light part of the zoom lens is closer to the y axis, and the better the imaging quality of the zoom lens is.
As shown in FIG. 7A, the vertical axis chromatic aberration of the zoom lens in the short focus state is controlled between-0.0017 to +0.0044 mm;
as shown in FIG. 7B, the vertical axis aberration of the zoom lens in the telephoto state is controlled to be between-0.0015 and +0.0034 mm.
In summary, the embodiment of the present invention provides a zoom lens with an ultra-large image plane and a large aperture, which adopts 14 optical lenses with specific structural shapes, and sequentially arranges the optical lenses from an object side to an image side according to a specific sequence, and adopts a suitable optical glass material through distribution of optical powers of the optical lenses, so that the structural form of the zoom lens, the refractive index, abbe number and other parameters of the lenses are matched with imaging conditions, and further spherical aberration, coma, astigmatism, field curvature, vertical axis chromatic aberration and axial chromatic aberration of the zoom lens are well corrected; therefore, on the premise of larger image surface, the large aperture and high resolution are simultaneously met, and better imaging performance under a low-light environment is further realized; the maximum length of the system is well controlled, so that the product performance and the overall dimension are well matched; the method can be widely applied to the field of security monitoring and other fields.
For the system/device embodiments, since they are substantially similar to the zoom lens embodiments, the description is relatively simple, and for the relevant points, reference may be made to partial description of the zoom lens embodiments.
It is to be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or operation from another entity or operation without necessarily requiring or implying any actual such relationship or order between such entities or operations.
It will be apparent to those skilled in the art that embodiments of the present application may be provided as a zoom lens, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely application embodiment, or an embodiment combining application and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of zoom lenses, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A zoom lens including an optical filter and an imaging surface, the zoom lens further comprising: the first lens group, the second lens group and the third lens group are sequentially arranged from an object side to an image side;
the total focal power of the first lens group is negative, the total focal power of the second lens group is positive, the total focal power of the third lens group is positive, and zooming is performed by moving the first lens group and the third lens group relative to the second lens group; the position of the second lens group is unchanged, and the position of the first lens group and/or the third lens group is changed;
wherein a focal length fg1 of the first lens group, a focal length fg2 of the second lens group, a focal length fg3 of the third lens group, a system focal length fw of the zoom lens in a short focus state and a system focal length ft of the zoom lens in a long focus state satisfy the relation:
-2.39≤fg1/fw≤-1.99；
9.44≤fg2/fw≤11.44；
-1≤fg1/fg3≤-0.6；
ft/fw is more than or equal to 2 and less than or equal to 5; wherein "-" indicates that the direction is negative.
2. The zoom lens according to claim 1, wherein the first lens group includes: the lens comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object side to an image side;
the first lens is a meniscus glass lens with negative focal power; the convex surface of the first lens faces to the object space;
the second lens and the third lens form a cemented lens group, and the focal power of the cemented lens group is positive;
the fourth lens is a negative focal power glass lens, and the surface of the fourth lens facing the object space is a concave surface.
3. The zoom lens according to claim 2, wherein a focal length f4 of the fourth lens satisfies: f4/fw is not less than 4.63 and not more than-3.83; wherein "-" indicates that the direction is negative.
4. The zoom lens according to claim 1, wherein the second lens group includes: a fifth lens;
the fifth lens is a positive focal power glass lens, and the surface of the fifth lens facing the object space is a convex surface.
5. The zoom lens according to claim 4, wherein an abbe number Vd5 of the fifth lens satisfies: vd5 is more than or equal to 80.
6. The zoom lens according to claim 1, wherein the third lens group comprises: a sixth lens, a seventh lens group, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens arranged in this order from the object side to the image side;
the sixth lens is a positive focal power glass lens;
the seventh lens and the fourteenth lens are meniscus glass lenses with negative focal power;
the eighth lens, the tenth lens, the eleventh lens and the thirteenth lens are double-convex glass lenses with positive focal power;
the ninth lens and the twelfth lens are double concave glass lenses with negative focal power;
the surfaces of the sixth lens and the seventh lens, which face the object side, are convex surfaces; the surface of the fourteenth lens facing the object side is a concave surface.
7. The zoom lens according to claim 6, wherein a curvature radius of a surface of the seventh lens facing the image side and a curvature radius of a surface of the eighth lens facing the object side are the same in value;
the curvature radius of the surface of the ninth lens facing the image space and the curvature radius of the surface of the tenth lens facing the object space have the same value.
8. The zoom lens of claim 7,
the seventh lens and the eighth lens form a cemented lens group;
and the ninth lens and the tenth lens form a cemented lens group.
9. The zoom lens of claim 6,
an abbe number Vd8 of the eighth lens satisfies: vd8 is more than or equal to 65;
an abbe number Vd10 of the tenth lens satisfies: vd10 is more than or equal to 65;
the refractive index nd6 of the sixth lens satisfies: nd6 is more than or equal to 1.9;
the refractive index nd11 of the eleventh lens satisfies: nd11 is more than or equal to 1.9.
10. The zoom lens according to claim 1, wherein an aperture stop is disposed between the first lens group and the second lens group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810193931.6A CN108519663B (en) | 2018-03-09 | 2018-03-09 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810193931.6A CN108519663B (en) | 2018-03-09 | 2018-03-09 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108519663A CN108519663A (en) | 2018-09-11 |
| CN108519663B true CN108519663B (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810193931.6A Active CN108519663B (en) | 2018-03-09 | 2018-03-09 | Zoom lens |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109324389A (en) * | 2018-10-31 | 2019-02-12 | 广州博冠光电科技股份有限公司 | A kind of wide-angle photographic lens |
| CN111208620A (en) * | 2020-03-19 | 2020-05-29 | 北华航天工业学院 | Zoom lens for visual inspection |
| CN114994889B (en) * | 2022-08-02 | 2022-10-25 | 浙江大华技术股份有限公司 | Lens and camera device |
| CN116736494B (en) * | 2023-08-14 | 2023-11-03 | 武汉高明兰光电科技有限公司 | Low-light night vision lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4222408B2 (en) * | 2006-11-06 | 2009-02-12 | セイコーエプソン株式会社 | Zoom lens and projector |
| US20130201394A1 (en) * | 2009-02-18 | 2013-08-08 | Sony Corporation | Zoom lens and image pickup apparatus |
| JP6031778B2 (en) * | 2012-02-28 | 2016-11-24 | 株式会社ニコン | Zoom lens, optical device, and method of manufacturing zoom lens |
| CN104155744B (en) * | 2013-05-14 | 2016-12-28 | 信泰光学(深圳)有限公司 | Zoom lens |
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| CN108519663A (en) | 2018-09-11 |
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