CN108363190B - Lens system and lens - Google Patents
Lens system and lens Download PDFInfo
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- CN108363190B CN108363190B CN201810162226.XA CN201810162226A CN108363190B CN 108363190 B CN108363190 B CN 108363190B CN 201810162226 A CN201810162226 A CN 201810162226A CN 108363190 B CN108363190 B CN 108363190B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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Abstract
The invention provides a lens system and a lens, wherein the lens system is provided with a first lens group with positive focal power and a second lens group with positive focal power in sequence from an object side to an image side along an optical axis; the first lens group includes, in order from an object side to an image side along an optical axis: the lens comprises a first lens with negative focal power, a second lens with negative focal power, a first sub-lens group with positive focal power and a third lens with positive focal power; the first sub-lens group comprises at least one meniscus lens with a convex surface facing to the image side; the second lens group includes, in order from an object side to an image side along an optical axis: the second sub-lens group with negative focal power, the third sub-lens group with positive focal power, the fourth lens with positive focal power and the fourth sub-lens group with positive focal power; in the scheme, the star-level large-aperture lens can be realized under the conditions of meeting the requirements of large target surface and high resolution under the coordination of the structures, focal power and arrangement sequence of each lens and the lens group.
Description
Technical Field
The present invention relates to the field of optical instruments, and in particular, to a lens system and a lens barrel.
Background
In the field of security protection, a network camera is a common device in a security protection system, a lens is a main constituent part of the network camera, the performance of the lens directly affects the imaging quality and the imaging view field, as the technical index requirement of the security protection system is continuously improved, an imaging element with a large target surface is used on the camera to enhance the imaging quality, but the imaging area of the lens also needs to be adapted to the imaging element with the large target surface, and when the imaging area of the lens is increased, higher requirements are provided for the spherical aberration, the coma aberration, the main ray emergence angle (CRA) and the chromatic aberration correction capability of the lens.
At present, under the condition that the existing lens meets the conditions of large target surface and high resolution (the maximum supports 800 ten thousand pixel cameras), the aperture is usually small (the aperture (F/#) is about 2.0 generally), and the lens cannot be clearly imaged under the condition of weak light due to the small aperture.
Therefore, it is necessary to develop a lens capable of realizing a starlight level large aperture under the conditions of meeting the requirements of a large target surface and high resolution (the maximum support is 800 ten thousand pixel cameras).
Disclosure of Invention
The embodiment of the invention provides a lens system and a lens, which are used for realizing a starlight-level large-aperture lens under the conditions of meeting the requirements of a large target surface and high resolution (the highest support is 800 ten thousand pixel cameras).
In the lens system according to the embodiment of the present invention, a first lens group having positive refractive power and a second lens group having positive refractive power are sequentially disposed from an object side to an image side along an optical axis;
the first lens group includes, in order from an object side to an image side along an optical axis: the lens comprises a first lens with negative focal power, a second lens with negative focal power, a first sub-lens group with positive focal power and a third lens with positive focal power; the first sub-lens group comprises at least one meniscus lens with a convex surface facing to the image side;
the second lens group includes, in order from an object side to an image side along an optical axis: the second sub-lens group with negative focal power, the third sub-lens group with positive focal power, the fourth lens with positive focal power and the fourth sub-lens group with positive focal power; wherein the fourth lens is a biconvex lens.
Preferably, the first sub-lens group and the third lens satisfy the condition: 3<f3/f<4.5，1.8<f4/f<2.8 of; wherein f is3Denotes the focal length of the first sub-lens group, f4Denotes a focal length of the third lens, and f denotes a focal length of the lens system.
Preferably, the refractive index of the glass material of the lens in the first sub-lens group and the refractive index of the glass material of the third lens are both greater than 1.8.
Preferably, the abbe number of the glass material of at least four lenses in the second lens group is greater than 65.
Preferably, the second sub-lens group includes, in order from the object side to the image side along the optical axis: a fifth lens with positive focal power and a sixth lens with negative focal power; the fifth lens is a biconvex lens, and the sixth lens is a biconcave lens; or
The fifth lens and the sixth lens are both meniscus lenses with convex surfaces facing the object side.
Preferably, the third sub-lens group includes at least two lenses.
Preferably, the third sub-lens group includes, in order from the object side to the image side along the optical axis: a seventh lens and an eighth lens; the seventh lens is a meniscus lens with a focal power being positive and a convex surface facing the image side, and the eighth lens is a meniscus lens with a focal power being negative and a convex surface facing the image side; or
The seventh lens is a biconcave lens with negative focal power, and the eighth lens is a biconvex lens with positive focal power.
Preferably, the third sub-lens group includes, in order from the object side to the image side along the optical axis: a seventh lens, an eighth lens, and a ninth lens; the seventh lens is a double-convex lens with positive focal power, the eighth lens is a double-concave lens with negative focal power, and the ninth lens is a double-convex lens with positive focal power.
Preferably, the fourth sub-lens group includes at least a meniscus lens with a convex surface facing the object side.
Preferably, the fourth sub-lens group includes a meniscus lens having positive power and a convex surface facing the object side; or
The fourth sub-lens group includes, in order from the object side to the image side along the optical axis: a meniscus lens having negative power and a convex surface toward the object side, and a double convex lens having positive power.
Preferably, the first sub-lens group comprises at least one meniscus lens with a convex surface facing the image side.
Preferably, the second lens is a biconcave lens or a meniscus lens with a convex surface facing the image side.
Preferably, the third lens is a plano-convex lens or a biconvex lens, a surface of which faces the image side is a plane.
An embodiment of the present invention further provides a lens, which sequentially includes, from an object side to an image side along an optical axis: any embodiment of the invention provides a lens system and an imaging surface.
Preferably, the lens barrel further includes: and the optical filter is arranged between the lens system and the imaging surface.
The embodiment of the invention has the following beneficial effects:
in the lens system and the lens provided by the embodiment of the invention, the star-level large-aperture lens can be realized under the conditions of meeting the requirements of a large target surface and high resolution (the highest support is 800 ten thousand pixel cameras) under the coordination of the structures, focal powers and arrangement sequences of all the lenses and the lens groups.
Drawings
FIG. 1(a) is a schematic structural diagram of a first lens system according to an embodiment of the present invention;
FIG. 1(b) is a schematic structural diagram of a second lens system according to an embodiment of the present invention;
FIG. 1(c) is a schematic structural diagram of a third lens system provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first lens provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second lens provided in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third lens barrel according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a lens system and a lens, which are used for realizing a starlight-level large-aperture lens under the conditions of meeting the requirements of a large target surface and high resolution (the highest support is 800 ten thousand pixel cameras).
In the lens system according to the embodiment of the present invention, a first lens group having positive refractive power and a second lens group having positive refractive power are sequentially disposed from an object side to an image side along an optical axis;
the first lens group includes, in order from an object side to an image side along an optical axis: the lens comprises a first lens with negative focal power, a second lens with negative focal power, a first sub-lens group with positive focal power and a third lens with positive focal power; the first lens is a meniscus lens with a convex surface facing the object side or a plano-concave lens with a surface facing the object side being a plane;
the second lens group includes, in order from an object side to an image side along an optical axis: the second sub-lens group with negative focal power, the third sub-lens group with positive focal power, the fourth lens with positive focal power and the fourth sub-lens group with positive focal power; wherein the fourth lens is a biconvex lens.
In the embodiment of the invention, under the matching of the structures, focal powers and arrangement sequences of the lenses and the lens groups, the star-level large-aperture lens can be realized under the conditions of meeting the requirements of a large target surface and high resolution (supporting 800 ten thousand pixels of a camera at most).
On the basis of meeting the parameter requirements of the optical system, the structure of each lens group can be specifically adjusted according to needs, and the embodiments of the present invention are further described in detail below with reference to the drawings in the specification.
The first embodiment is as follows:
fig. 1(a) is a schematic structural diagram of a lens system according to an embodiment of the present invention. The lens system is provided with a first lens group 1 with positive focal power and a second lens group 2 with positive focal power in sequence from an object side to an image side along an optical axis.
As shown in fig. 1(a), the first lens group 1 includes, in order from the object side to the image side along the optical axis: a first lens 11 with negative focal power, a second lens 12 with negative focal power, a first sub-lens group 13 with positive focal power, and a third lens 14 with positive focal power; the first lens element 11 is a meniscus lens element with a convex surface facing the object side, the second lens element 12 is a biconcave lens element, and the third lens element 14 is a plano-convex lens element with a planar surface facing the image side.
The first sub-lens group 13 includes at least one meniscus lens with a convex surface facing the image side. For example, as shown in fig. 1(a), the first sub-lens group 13 includes, in order from the object side to the image side along the optical axis: a meniscus lens 131 whose power is positive and whose convex surface faces the image side, and a meniscus lens 132 whose power is negative and whose convex surface faces the image side.
As shown in fig. 1(a), the second lens group includes, in order from the object side to the image side along the optical axis: a second sub-lens group 15 with negative focal power, a third sub-lens group 16 with positive focal power, a fourth lens 17 with positive focal power, and a fourth sub-lens group 18 with positive focal power; wherein the fourth lens 17 is a biconvex lens.
As shown in fig. 1(a), the second sub-lens group 15 includes, in order from the object side to the image side along the optical axis: a fifth lens 151 having positive optical power and a sixth lens 152 having negative optical power; the fifth lens 151 is a biconvex lens, and the sixth lens 152 is a biconcave lens.
The third sub-lens group 16 includes at least two lenses. For example, as shown in fig. 1(a), the third sub-lens group 16 includes, in order from the object side to the image side along the optical axis: a seventh lens 161 and an eighth lens 162; the seventh lens element 161 is a meniscus lens element with positive power and convex surface facing the image side, and the eighth lens element 162 is a meniscus lens element with negative power and convex surface facing the image side.
The fourth sub-lens group 18 includes at least a meniscus lens with a convex surface facing the object side. For example, as shown in fig. 1(a), the fourth sub-lens group 18 includes a meniscus lens 181 whose power is positive and whose convex surface faces the object side.
In a preferred embodiment, as shown in fig. 1(a), the lens system may further include: an aperture stop 3 disposed between the second sub-lens group 15 and the third sub-lens group 16.
In a preferred embodiment, as shown in fig. 1(a), the meniscus lens 131 and the meniscus lens 132 in the first sub-lens group 13 are cemented together to form a cemented lens group.
In a preferred embodiment, as shown in fig. 1(a), the fifth lens 151 and the sixth lens 152 in the second sub-lens group 15 are cemented together to form a cemented lens group.
In a preferred embodiment, as shown in fig. 1(a), the seventh lens 161 and the eighth lens 162 in the third sub-lens group 16 are cemented together to form a cemented lens group.
It should be noted that the lenses in the cemented lens group may also be only close together without being cemented, and the cemented lens group may be one or more cemented groups, which are not limited in the embodiments of the present invention.
In a preferred embodiment, in order to reduce assembly errors and reduce the length of the system, the first sub-lens group 13 and the third lens group 14 satisfy the condition: 3<f3/f<4.5，1.8<f4/f<2.8 of; wherein f is3Denotes the focal length, f, of the first sub-lens group 134Denotes the focal length of the third lens 14 and f denotes the focal length of the lens system. This is because f3F and f4The larger the ratio/f is, the smaller the assembly error of the first sub-lens group 13 and the third lens group 14 is, and the finalThe better the performance, but if the ratio is too large, the length of the system will be too large to be compact, so the above preferred ratio range is selected.
In a preferred embodiment, in order to reduce the manufacturing tolerance sensitivity, the refractive index of the glass material of the lens in the first sub-lens group 13 and the refractive index of the glass material of the third lens 14 are both greater than 1.8.
Of course, in another preferred embodiment, in order to better improve the system performance, the refractive index of the glass material of the lens in the first sub-lens group 13 and the refractive index of the glass material of the third lens 14 may be greater than 1.8, and the first sub-lens group 13 and the third lens 14 satisfy the condition: 3<f3/f<4.5，1.8<f4/f<2.8 of; wherein f is3Denotes the focal length, f, of the first sub-lens group 134The focal length of the third lens 14 is shown, and f is the focal length of the lens system, which is not limited in the embodiment of the present invention.
In a preferred embodiment, in order to achieve low-illumination color imaging and no thermalization (i.e. clear imaging under the environment of-40 ℃ to 80 ℃), the abbe number of the glass material of at least four lenses in the second lens group 2 is greater than 65.
Example two:
the lens system provided in the second embodiment of the present invention is similar to the lens system provided in the first embodiment of the present invention, and the same parts are not described herein again, and only different parts are described below.
In the lens system according to the second embodiment of the present invention, the first sub-lens group 13 may include a meniscus lens with a convex surface facing the image side. For example, as shown in fig. 1(b), the first sub-lens group 13 includes a meniscus lens 131 having positive power and a convex surface facing the image side.
As shown in fig. 1(b), the third lens 14 is a biconvex lens.
As shown in fig. 1(b), the second sub-lens group 15 includes, in order from the object side to the image side along the optical axis: a fifth lens 151 having positive optical power and a sixth lens 152 having negative optical power; the fifth lens 151 and the sixth lens 152 are both meniscus lenses with convex surfaces facing the object side.
As shown in fig. 1(b), the third sub-lens group 16 includes, in order from the object side to the image side along the optical axis: a seventh lens 161 and an eighth lens 162; the seventh lens 161 is a biconcave lens having negative refractive power, and the eighth lens 162 is a biconvex lens having positive refractive power.
As shown in fig. 1(b), the fourth sub-lens group 18 includes, in order from the object side to the image side along the optical axis: a meniscus lens 182 having negative power and a convex surface toward the object side, and a double convex lens 183 having positive power.
In a preferred embodiment, as shown in fig. 1(b), the fifth lens 151 and the sixth lens 152 in the second sub-lens group 15 are cemented together to form a cemented lens group.
In a preferred embodiment, as shown in fig. 1(b), the seventh lens 161 and the eighth lens 162 in the third sub-lens group 16 are cemented together to form a cemented lens group.
In a preferred embodiment, as shown in fig. 1(b), the meniscus lens 182 and the biconvex lens 183 in the fourth sub-lens group 18 are cemented together to form a cemented lens group.
It should be noted that the lenses in the cemented lens group may also be only close together without being cemented, and the cemented lens group may be one or more cemented groups, which are not limited in the embodiments of the present invention.
Example three:
the lens system provided in the third embodiment of the present invention is similar to the lens system provided in the first embodiment of the present invention, and the same parts are not described herein again, and only different parts are described below.
In the lens system according to the third embodiment of the present invention, as shown in fig. 1(c), the first lens element 11 may be a plano-concave lens element whose surface facing the object side is a plane.
As shown in fig. 1(c), the second lens 12 may be a meniscus lens with a convex surface facing the image side.
The first sub-lens group 13 may include a meniscus lens with a convex surface facing the image side. For example, as shown in fig. 1(c), the first sub-lens group 13 includes a meniscus lens 131 having positive power and a convex surface facing the image side.
As shown in fig. 1(c), the third lens 14 is a biconvex lens.
As shown in fig. 1(c), the third sub-lens group 16 includes, in order from the object side to the image side along the optical axis: a seventh lens 161, an eighth lens 162, and a ninth lens 163; the seventh lens 161 is a double convex lens having positive power, the eighth lens 162 is a double concave lens having negative power, and the ninth lens 163 is a double convex lens having positive power.
In a preferred embodiment, as shown in fig. 1(c), the seventh lens 161, the eighth lens 162 and the ninth lens 163 in the third sub-lens group 16 are cemented together to form a cemented lens group.
It should be noted that the lenses in the cemented lens group may also be only close together without being cemented, and the cemented lens group may be one or more cemented groups, which are not limited in the embodiments of the present invention.
In the examples of the present invention, unless otherwise specified, the refractive index refers to the refractive index of the optical glass material with respect to d-light (i.e., the refractive index of the optical glass material measured by d-light), and the abbe number refers to the abbe number of the optical glass material with respect to d-light (i.e., the abbe number obtained from the refractive index of the optical glass material measured by d-light). Wherein d light represents sodium yellow light with a wavelength of 589.3 nm.
Based on the same inventive concept, an embodiment of the present invention further provides a lens, sequentially including, from an object side to an image side along an optical axis: any embodiment of the invention provides a lens system and an imaging plane 4. The schematic structural diagrams are shown in fig. 2, fig. 3 and fig. 4, respectively, fig. 2 includes the lens system shown in fig. 1(a), fig. 3 includes the lens system shown in fig. 1(b), and fig. 4 includes the lens system shown in fig. 1 (c).
In a preferred embodiment, in order to reduce color cast, as shown in fig. 2, 3 and 4, the lens barrel may further include: and a filter 5 disposed between the zoom lens system and the image plane 4.
Due to the lens system, aberration is well corrected, the image plane size is large (8.8mm), the imaging resolution is high (the maximum size supports 800 ten thousand pixel cameras), the aperture is large (the aperture (F/#) can reach 1.03), and the imaging quality is excellent.
Three preferred embodiments are illustrated below to facilitate an understanding of the lens provided by the embodiments of the present invention.
Example four:
in specific implementation, in the lens barrel shown in fig. 2, the curvature radius R, the center thickness Tc (i.e. the distance between the center points of the adjacent mirror surfaces), and the refractive index N of the mirror surface of each lens from the object side to the image side along the optical axisdAnd Abbe number VdThe conditions listed in table 1 are satisfied:
TABLE 1
Wherein STO denotes an aperture stop, IMA denotes an image plane, and Infinity denotes Infinity, i.e., a plane; the mirror surfaces of the lenses are arranged in order from the object side to the image side along the optical axis, for example: the mirror surfaces of the lens 11 are mirror surfaces 1 and 2, the mirror surfaces of the lens 12 are mirror surfaces 3 and 4, the mirror surfaces of the meniscus lens 131 in the first sub-lens group 13 are mirror surfaces 5 and 6, and so on, because the meniscus lens 131 and the meniscus lens 132 in the first sub-lens group 13 are glued together, the glued surfaces of the meniscus lens 131 and the meniscus lens 132 are the same mirror surface (i.e. mirror surface 6), and the other glued surfaces are also similar, R1 in table 1 represents the curvature radius of the mirror surface 1, T1 represents the distance between the center points of the mirror surface 1 and the mirror surface 2, n1 represents the refractive index of the optical glass material of the mirror surface 1 relative to d light, V1 represents the abbe number of the optical glass material of the mirror surface 1 relative to d light, and so on the other parameters in table 1, and so on, and details thereof are not repeated herein.
From the data of table 1, one can obtain:
the focal length f of the lens system is: 8.0 mm;
focal length f of the first sub-lens group 133Comprises the following steps: 25.94 mm;
focal length f of the third lens 144Comprises the following steps: 15.25 mm;
f3/f＝25.94/8＝3.24；
f4/f＝15.25/8＝1.90；
the refractive indexes of the glass materials of the meniscus lens 131 and 132 and the third lens 14 in the first sub-lens group 13 are: 2.001, 2.003, 1.954, all greater than 1.8.
The abbe numbers of the glass materials of the fifth lens 151, the seventh lens 161, the fourth lens 17 and the meniscus lens 181 in the second lens group 2 are respectively as follows: 81.608, 68.624, 95.100, 68.624, all greater than 65.
It should be noted that the lens according to the fourth embodiment of the present invention has the following optical technical indexes:
total optical length TTL: 48.0 mm;
angle of view 2 ω of lens: 65.6 degrees;
aperture of lens system (F/#): 1.03;
size of a lens image plane: 8.8 mm.
The lens system and the lens provided by the fourth embodiment of the present invention are further described below by performing a detailed optical system analysis on the fourth embodiment of the present invention.
The optical transfer function is used for evaluating the imaging quality of an optical system in a more accurate, visual and common mode, the higher and smoother curve of the optical transfer function shows that the imaging quality of the system is better, and various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like) are well corrected.
The optical transfer function (MTF) curve of the visible part of the lens is smooth and concentrated, and the MTF average value of the whole field of view can still be ensured to reach more than 0.3 at 160 lp/mm.
Example five:
in specific implementation, in the lens barrel shown in fig. 3, the radius of curvature R, the central thickness Tc, and the refractive index N of the mirror surface of each lens from the object side to the image side along the optical axisdAnd Abbe number VdThe conditions listed in table 2 are satisfied:
TABLE 2
From the data of table 2, one can obtain:
the focal length f of the lens system is: 8.3 mm;
focal length f of the first sub-lens group 133Comprises the following steps: 33.53 mm;
focal length f of the third lens 144Comprises the following steps: 16.88 mm;
f3/f＝33.53/8.3＝4.04；
f4/f＝16.88/8.3＝2.03；
the refractive indexes of the glass materials of the meniscus lens 131 and the third lens 14 in the first sub-lens group 13 are: 1.883, 2.051, both are greater than 1.8.
The abbe numbers of the glass materials of the fifth lens 151, the eighth lens 162, the fourth lens 17 and the double-convex lens 183 in the second lens group 2 are respectively as follows: 68.525, 68.525, 68.525, 68.525, all greater than 65.
It should be noted that the lens according to the fifth embodiment of the present invention has the following optical technical indexes:
total optical length TTL: 46.0 mm;
angle of view 2 ω of lens: 63.5 degrees;
aperture of lens system (F/#): 1.03;
size of a lens image plane: 8.8 mm.
The lens system and the lens provided by the fifth embodiment of the present invention are further described below through a detailed optical system analysis of the fifth embodiment of the present invention.
The optical transfer function (MTF) curve of the visible part of the lens is smooth and concentrated, and the MTF average value of the whole field of view can still be ensured to be more than 0.3 at 160 lp/mm.
Example six:
in specific implementation, in the lens barrel shown in fig. 4, the radius of curvature R, the central thickness Tc, and the refractive index N of the mirror surface of each lens from the object side to the image side along the optical axisdAnd Abbe number VdThe conditions listed in table 3 are satisfied:
TABLE 3
From the data of table 3, one can obtain:
the focal length f of the lens system is: 7.88 mm;
focal length f of the first sub-lens group 133Comprises the following steps: 28.15 mm;
focal length f of the third lens 144Comprises the following steps: 20.55 mm;
f3/f＝28.15/7.88＝3.57；
f4/f＝20.55/7.88＝2.61；
the refractive indexes of the glass materials of the meniscus lens 131 and the third lens 14 in the first sub-lens group 13 are: 1.816, 1.954, both greater than 1.8.
The abbe numbers of the glass materials of the fifth lens 151, the seventh lens 161, the ninth lens 163, the fourth lens 17, and the meniscus lens 181 in the second lens group 2 are respectively: 81.608, 67.002, 67.002, 67.002, 67.002, all greater than 65.
It should be noted that the lens according to the sixth embodiment of the present invention has the following optical technical indexes:
total optical length TTL: 46.0 mm;
angle of view 2 ω of lens: 70 degrees;
aperture of lens system (F/#): 1.03;
size of a lens image plane: 8.8 mm.
The lens system and the lens provided by the sixth embodiment of the present invention are further described below by performing a detailed optical system analysis on the sixth embodiment of the present invention.
The optical transfer function (MTF) curve of the visible part of the lens is smooth and concentrated, and the MTF average value of the whole field of view can still be ensured to be more than 0.3 at 160 lp/mm.
To sum up, the embodiments of the present invention provide a lens system and a lens, which adopt optical lenses with specific structural shapes, and sequentially arrange the optical lenses from an object side to an image side in sequence, and adopt adaptive optical glass materials through the distribution of the focal power of each optical lens, so that the structural shape of the lens, the focal power distribution of the lens, the refractive index of the lens, the abbe number and other parameters match with the imaging conditions, and further the spherical aberration, coma aberration, astigmatism, field curvature, vertical axis chromatic aberration and axial chromatic aberration of the lens are well corrected, thereby implementing a large target surface, high resolution (up to 800 ten thousand pixels of camera), a large field angle and a starlight level large aperture lens; the optical lens has good heat difference eliminating performance, compact structure and small overall dimension, all optical lenses adopt glass spherical surface design, the cold processing performance is good, and the production cost is low; the method can be widely applied to the field of security monitoring, and clear color imaging under all-weather low-light conditions is realized.
While preferred embodiments of the present invention 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 such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (13)
1. A lens system is characterized in that a first lens group with positive focal power and a second lens group with positive focal power are arranged in sequence from an object side to an image side along an optical axis;
the first lens group includes, in order from an object side to an image side along an optical axis: the lens comprises a first lens with negative focal power, a second lens with negative focal power, a first sub-lens group with positive focal power and a third lens with positive focal power; the first sub-lens group comprises at least one meniscus lens with a convex surface facing to the image side;
the second lens group includes, in order from an object side to an image side along an optical axis: the second sub-lens group with negative focal power, the third sub-lens group with positive focal power, the fourth lens with positive focal power and the fourth sub-lens group with positive focal power; wherein the fourth lens is a biconvex lens; the second sub-lens group includes, in order from an object side to an image side along an optical axis: a fifth lens with positive focal power and a sixth lens with negative focal power; the fifth lens is a biconvex lens, and the sixth lens is a biconcave lens; or, the fifth lens and the sixth lens are both meniscus lenses with convex surfaces facing the object side;
the first sub-lens group and the third lens satisfy a condition: 3<f3/f<4.5，1.8<f4/f<2.8 of; wherein f is3Denotes the focal length of the first sub-lens group, f4Denotes a focal length of the third lens, and f denotes a focal length of the lens system.
2. The lens system of claim 1 wherein the refractive index of the glass material of each of the lenses of the first sub-lens group and the third lens is greater than 1.8.
3. The lens system of claim 1, wherein the glass of at least four lenses in the second lens group has an abbe number greater than 65.
4. The lens system of claim 3 wherein the third sub-lens group comprises at least two lenses.
5. The lens system of claim 4, wherein the third sub-lens group comprises, in order from the object side to the image side along the optical axis: a seventh lens and an eighth lens; the seventh lens is a meniscus lens with a focal power being positive and a convex surface facing the image side, and the eighth lens is a meniscus lens with a focal power being negative and a convex surface facing the image side; or
The seventh lens is a biconcave lens with negative focal power, and the eighth lens is a biconvex lens with positive focal power.
6. The lens system of claim 4, wherein the third sub-lens group comprises, in order from the object side to the image side along the optical axis: a seventh lens, an eighth lens, and a ninth lens; the seventh lens is a double-convex lens with positive focal power, the eighth lens is a double-concave lens with negative focal power, and the ninth lens is a double-convex lens with positive focal power.
7. The lens system of claim 4, wherein the fourth sub-lens group comprises at least a meniscus lens with a convex surface facing the object side.
8. The lens system of claim 7, wherein the fourth sub-lens group comprises a meniscus lens with positive power and convex surface toward the object side; or
The fourth sub-lens group includes, in order from the object side to the image side along the optical axis: a meniscus lens having negative power and a convex surface toward the object side, and a double convex lens having positive power.
9. The lens system of claim 8, wherein the first lens is a meniscus lens with a convex surface facing the object side or a plano-concave lens with a surface facing the object side being planar.
10. The lens system of claim 9, wherein the second lens is a biconcave lens or a meniscus lens with a convex surface facing the image side.
11. The lens system of claim 10, wherein the third lens is a plano-convex lens or a biconvex lens with a planar surface facing the image side.
12. A lens barrel, comprising, in order from an object side to an image side along an optical axis: a lens system and an imaging surface as claimed in any one of claims 1 to 11.
13. The lens barrel as recited in claim 12, further comprising: and the optical filter is arranged between the lens system and the imaging surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810162226.XA CN108363190B (en) | 2018-02-27 | 2018-02-27 | Lens system and lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810162226.XA CN108363190B (en) | 2018-02-27 | 2018-02-27 | Lens system and lens |
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| CN108363190A CN108363190A (en) | 2018-08-03 |
| CN108363190B true CN108363190B (en) | 2021-02-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110609380B (en) * | 2019-09-12 | 2022-02-15 | 浙江大华技术股份有限公司 | Lens |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6078435A (en) * | 1997-11-26 | 2000-06-20 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens system |
| JP2005316052A (en) * | 2004-04-28 | 2005-11-10 | Tochigi Nikon Corp | Image forming optical system |
| JP2016206257A (en) * | 2015-04-16 | 2016-12-08 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| CN106772935A (en) * | 2016-12-07 | 2017-05-31 | 浙江大华技术股份有限公司 | A kind of lens combination and tight shot |
| CN107632369A (en) * | 2017-10-16 | 2018-01-26 | 浙江大华技术股份有限公司 | A kind of tight shot and picture pick-up device |
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2018
- 2018-02-27 CN CN201810162226.XA patent/CN108363190B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6078435A (en) * | 1997-11-26 | 2000-06-20 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens system |
| JP2005316052A (en) * | 2004-04-28 | 2005-11-10 | Tochigi Nikon Corp | Image forming optical system |
| JP2016206257A (en) * | 2015-04-16 | 2016-12-08 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| CN106772935A (en) * | 2016-12-07 | 2017-05-31 | 浙江大华技术股份有限公司 | A kind of lens combination and tight shot |
| CN107632369A (en) * | 2017-10-16 | 2018-01-26 | 浙江大华技术股份有限公司 | A kind of tight shot and picture pick-up device |
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