CN111610618A - Lens - Google Patents
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- CN111610618A CN111610618A CN202010622877.XA CN202010622877A CN111610618A CN 111610618 A CN111610618 A CN 111610618A CN 202010622877 A CN202010622877 A CN 202010622877A CN 111610618 A CN111610618 A CN 111610618A
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- lens
- power lens
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- lens group
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
Abstract
The invention discloses a lens, because in the embodiment of the invention, four lens groups are arranged in the lens in a specific order from an object side to an image side, and the lens groups in the lens meet the following conditions: f 1/f' is more than or equal to 1.21 and less than or equal to 1.41; 2.25 ≦ TTL/((BFL. f')1/2) Less than or equal to 2.65; wherein f1 is a focal length of the first lens group, f' is a focal length of the lens, TTL is an optical total length of the lens, and BFL is a distance between the fourth lens group and the image plane. To a certain extent, the size and the aperture of the target surface of the lens are increased, so that the resolution of the collected image is higher, and the light transmission amount of the lens can be still ensured under a low-illumination scene, so that the quality of the obtained image is better, and the optical total length of the lens is reduced. Therefore, the embodiment of the invention provides the lens which is small in size, large in target surface size and large in aperture.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
Along with the development of society, people's safety precaution consciousness is constantly improved, and security protection monitoring industry also obtains high-speed development, and the effect of control performance is also bigger and bigger. At present, the monitoring fixed focus lens is widely applied to daily life of people, but the conventional security monitoring and road condition monitoring lens has the following defects:
most of the lens are simple in structure, the size of the target surface is small, the resolution of the acquired image is low, the shooting effect is general, and the picture value is not large. Most of the apertures of the zoom lenses on the market are small, so that the light transmission of the lenses is less, images obtained under a low-illumination scene are darker, and the image quality is difficult to guarantee. With the advance of high-definition and miniaturization of security protection, a lens is required to achieve higher performance and smaller size. Therefore, it is important to develop a lens system with small volume, large target surface size and large aperture.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing a lens with small volume, large target surface size and large aperture.
The embodiment of the invention provides a lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group and an image plane, wherein the first lens group, the second lens group, the third lens group, the fourth lens group and the image plane are sequentially arranged from an object side to an image side;
the lens group satisfies the following conditions:
1.21≤f1/f’≤1.41；
2.25≤TTL/((BFL*f’)1/2)≤2.65；
wherein f1 is a focal length of the first lens group, f' is a focal length of the lens, TTL is an optical total length of the lens, and BFL is a distance between the fourth lens group and the image plane.
Further, the first lens group comprises a first positive focal power lens, a first negative focal power lens, a second positive focal power lens and a second negative focal power lens which are arranged in sequence from the object side to the image side;
the curvature radius of the surface of the second positive focal power lens facing the image side is the same as that of the surface of the second negative focal power lens facing the object side;
the first positive power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the first negative power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the second positive power lens comprises a biconvex lens;
the second negative power lens includes a biconcave lens.
Further, the second lens group includes a third positive power lens and a third negative power lens arranged in order from the object side to the image side;
the curvature radius of the surface of the third positive focal power lens facing the image side is the same as that of the surface of the third negative focal power lens facing the object side;
the third positive power lens comprises a biconvex lens;
the third negative power lens includes a biconcave lens.
Further, the third lens group includes a fourth positive power lens and a fourth negative power lens arranged in order from the object side to the image side;
the curvature radius of the surface of the fourth positive focal power lens facing the image side is the same as that of the surface of the fourth negative focal power lens facing the object side;
the fourth positive focal power lens comprises a meniscus lens, and the surface of the meniscus lens facing the image side is a convex surface;
the fourth negative power lens includes a biconcave lens.
Further, the fourth lens group includes a fifth positive power lens and a sixth positive power lens arranged in order from the object side to the image side;
the fifth positive power lens includes a biconvex lens;
the sixth positive power lens includes a convex lens whose surface facing the object side is convex.
Further, the abbe numbers of the second positive power lens and the fourth positive power lens are both greater than or equal to 63.
Further, the refractive index of the third positive power lens is 1.88 or more.
Further, an aperture diaphragm is arranged between the second lens group and the third lens group.
Further, a light splitting device is arranged between the fourth lens group and the image surface;
the light splitting device comprises two prisms, and the joint surfaces of the two prisms are provided with film layers with light splitting functions; the light emergent side of each prism is respectively provided with a corresponding image surface;
the light reflected by the joint surface is vertical to an image surface for receiving the light.
Further, the included angle between the light incidence surface of the light splitting device and the joint surface ranges from 30 degrees to 46 degrees.
The embodiment of the invention provides a lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group and an image plane, wherein the first lens group, the second lens group, the third lens group, the fourth lens group and the image plane are sequentially arranged from an object side to an image side; the lens group satisfies the following conditions: f 1/f' is more than or equal to 1.21 and less than or equal to 1.41; TTL/(BFL f') is more than or equal to 2.251/2Less than or equal to 2.65; wherein f1 is a focal length of the first lens group, f' is a focal length of the lens, TTL is an optical total length of the lens, and BFL is a distance between the fourth lens group and the image plane.
Since, in the embodiment of the present invention, four lens groups are arranged in order from the object side to the image side in the lens barrel in a specific order, and the lens groups in the lens barrel satisfy: f 1/f' is more than or equal to 1.21 and less than or equal to 1.41; 2.25 ≦ TTL/((BFL. f')1/2) Less than or equal to 2.65; to a certain extent, the size and the aperture of the target surface of the lens are increased, so that the resolution of the collected image is higher, and the light transmission amount of the lens can be still ensured under a low-illumination scene, so that the quality of the obtained image is better, and the optical total length of the lens is reduced. Therefore, the embodiment of the invention provides the lens which is small in size, large in target surface size and large in aperture.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a lens structure according to an embodiment of the present invention;
fig. 2 is a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 of the present invention in a normal temperature state of a visible light band;
fig. 3 is a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 of the present invention in a visible light band-30 ℃;
fig. 4 is a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 of the present invention in a state of a visible light band +70 ℃;
fig. 5 is a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 in a near-infrared band normal temperature state.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, and it should be understood 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.
Fig. 1 is a schematic view of a lens barrel according to an embodiment of the present invention, the lens barrel including a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, and an image plane N, which are arranged in order from an object side to an image side;
the lens group satisfies the following conditions:
1.21≤f1/f’≤1.41；
2.25≤TTL/((BFL*f’)1/2)≤2.65；
wherein f1 is a focal length of the first lens group, f' is a focal length of the lens, TTL is an optical total length of the lens, and BFL is a distance between the fourth lens group and the image plane.
In the lens barrel provided by the embodiment of the invention, each lens group has a corresponding focal length f, the focal length of the lens barrel is f', and the focal length of the first lens group is f1. In order to provide a large target surface, large aperture lens, the lens group satisfies the following relation:
1.21≤f1/f’≤1.41；
2.25≤TTL/((BFL*f’)1/2)≤2.65；
wherein f1 is a focal length of the first lens group, f' is a focal length of the lens, TTL is an optical total length of the lens, and BFL is a distance between the fourth lens group and the image plane.
Because in the embodiment of the invention, in the lensFour lens groups are arranged in order from an object side to an image side in a specific order, and the lens groups in the lens satisfy: f 1/f' is more than or equal to 1.21 and less than or equal to 1.41; 2.25 ≦ TTL/((BFL. f')1/2) Less than or equal to 2.65; to a certain extent, the size and the aperture of the target surface of the lens are increased, so that the resolution of the collected image is higher, and the light transmission amount of the lens can be still ensured under a low-illumination scene, so that the quality of the obtained image is better, and the optical total length of the lens is reduced. Therefore, the embodiment of the invention provides the lens which is small in size, large in target surface size and large in aperture.
Generally, when light enters the lens and reaches the focal plane, the light is easy to be refracted and bent seriously at the edge part than at the central part, which results in the reduction of sharpness and contrast and the generation of light spots, thereby causing the reduction of image quality, and this aberration is called spherical aberration. In an embodiment of the present invention, a lens group satisfies the following conditions: f 1/f' is more than or equal to 1.21 and less than or equal to 1.41; 2.25 ≦ TTL/((BFL. f')1/2) Less than or equal to 2.65, and the lens length, the spherical aberration and the manufacturability of the lens can also be considered.
In order to further improve the imaging quality of the lens, in the embodiment of the present invention, the first lens group includes a first positive power lens L1, a first negative power lens L2, a second positive power lens L3, and a second negative power lens L4, which are arranged in this order from the object side to the image side;
the curvature radius of the surface of the second positive focal power lens facing the image side is the same as that of the surface of the second negative focal power lens facing the object side;
the first positive power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the first negative power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the second positive power lens comprises a biconvex lens;
the second negative power lens includes a biconcave lens.
To further enable the system to be compact, the second positive power lens and the second negative power lens may be cemented or otherwise snugly connected.
The second lens group comprises a third positive power lens L5 and a third negative power lens L6 which are arranged in order from the object side to the image side;
the curvature radius of the surface of the third positive focal power lens facing the image side is the same as that of the surface of the third negative focal power lens facing the object side;
the third positive power lens comprises a biconvex lens;
the third negative power lens includes a biconcave lens.
To further enable the system to be compact, the third positive power lens and the third negative power lens may be cemented or cemented.
The third lens group comprises a fourth positive power lens L7 and a fourth negative power lens L8 which are arranged in order from the object side to the image side;
the curvature radius of the surface of the fourth positive focal power lens facing the image side is the same as that of the surface of the fourth negative focal power lens facing the object side;
the fourth positive focal power lens comprises a meniscus lens, and the surface of the meniscus lens facing the image side is a convex surface;
the fourth negative power lens includes a biconcave lens.
To further enable the system to be compact, the fourth positive power lens and the fourth negative power lens may be cemented or otherwise snugly connected.
The fourth lens group comprises a fifth positive power lens L9 and a sixth positive power lens L10 which are arranged in order from the object side to the image side;
the fifth positive power lens includes a biconvex lens;
the sixth positive power lens includes a convex lens whose surface facing the object side is convex.
In order to increase the refractive index of the lens and reduce the total length of the lens, in the embodiment of the invention, the refractive index of the third positive power lens is greater than or equal to 1.88. In addition, the refractive index of the third positive power lens is larger than or equal to 1.88, so that the spherical aberration can be reduced, and the image quality can be improved.
In the embodiment of the invention, in order to realize day and night confocal and no thermalization in the full focal section of the lens, namely, clear imaging can be realized at-30 ℃ to 70 ℃, in the embodiment of the invention, the abbe numbers of the second positive power lens and the fourth positive power lens are both more than or equal to 63. In addition, the abbe numbers of the second positive focal power lens and the fourth positive focal power lens are both larger than or equal to 63, and the chromatic aberration of the image can be reduced, so that the image quality is improved. The abbe numbers of the second positive focal power lens and the fourth positive focal power lens can be the same or different.
In the embodiment of the present invention, an aperture stop P is disposed between the second lens group and the third lens group.
Wherein, the aperture diaphragm is arranged at a position close to the front of the third lens group and is used for controlling the aperture and the area of the light beam entering the system.
The aperture size of the aperture diaphragm determines the aperture value of the lens and the depth of field during shooting, the aperture size can be fixed, or the aperture diaphragm with adjustable aperture can be placed according to the requirement to realize the adjustment of the clear aperture, namely the purpose of changing the aperture value of the lens and the depth of field is achieved.
In the embodiment of the present invention, a light splitting device Q is disposed between the fourth lens group and the image plane;
the light splitting device comprises two prisms, and the joint surfaces of the two prisms are provided with film layers with light splitting functions; the light emergent side of each prism is respectively provided with a corresponding image surface;
the light reflected by the joint surface is vertical to an image surface for receiving the light.
In order to optimize visible light and infrared light respectively, the lens further includes a light splitting device, the light splitting device is a prism group formed by two prisms, a film layer with a light splitting function is arranged on a joint surface of the two prisms, and the film layer can be set according to user requirements, for example, the film layer can reflect visible light and transmit infrared light, and the film layer can reflect infrared light and transmit visible light. Two prisms in the prism set can be respectively connected to an imaging chip, such as a Complementary Metal Oxide Semiconductor (CMOS) chip. The imaging chip receives the visible light image and the infrared light image respectively, and then the visible light image and the infrared light image can be fused through an image fusion algorithm. Therefore, weak white light supplement can be adopted in a low-illumination environment, and appropriate infrared light supplement is combined to realize scene supplement, so that the quality of the fused image is ensured. The dazzling feeling of drivers or pedestrians caused by the use of strong white light flashing lamps in the prior art is avoided. And the light emergent side of each prism is respectively provided with a corresponding optical filter and an image surface. In order to further improve the light reflectivity and the utilization rate and avoid the low image brightness, the light reflected by the joint surface is vertical to the image surface for receiving the light.
The included angle between the light incidence surface S1 surface of the light splitting device and the joint surface ranges from 30 degrees to 46 degrees.
In the embodiment of the invention, the included angle between the light incident surface S1 of the light splitting device and the bonding surface is in the range of 30 degrees to 46 degrees. The light reflected by the joint surface can enter the corresponding image surface, so that imaging is guaranteed.
The embodiment of the invention adopts the technical scheme to realize the spectroscopic imaging system with an oversized target surface, a large aperture, an athermal function and high resolution.
The following exemplifies the lens parameters provided by the embodiment of the present invention.
Example 1:
in a specific implementation, the curvature radius R, the center thickness Tc, the refractive index Nd, and the abbe constant Vd of each lens of the lens barrel satisfy the conditions listed in table 1:
TABLE 1
The lens provided in embodiment 1 has the following optical technical indexes:
the total optical length TTL is less than or equal to 115 mm;
focal length f' of the lens: 55 mm;
angle of view of lens: 18.2 degrees;
optical distortion of the lens: -0.6%;
aperture fno of lens system: f1.3;
size of a lens image plane: 1.1' (≧ phi 17.6 mm).
The imaging system provided by the present embodiment will be further described by analyzing the embodiments in detail.
The optical transfer function is used for evaluating the imaging quality of the imaging 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.
As shown in fig. 2, it is a graph of an optical transfer function (MTF) of the imaging system in a normal temperature state in the visible light band; as shown in fig. 3, is a graph of the optical transfer function (MTF) of the imaging system in the visible band-30 ℃; as shown in fig. 4, is a graph of the optical transfer function (MTF) of the imaging system in the visible band +70 ℃; as shown in fig. 5, it is a graph of the optical transfer function (MTF) of the imaging system in the near infrared band at normal temperature. As can be seen from fig. 2 to 5, the optical transfer function (MTF) curve of the imaging system in the normal temperature state in the visible light portion is smooth and concentrated, and the average MTF value of the full field of view (half image height Y' is 8.8mm) reaches 0.5 or more; therefore, the imaging system provided by the embodiment can achieve high resolution, and meet the imaging requirement of a 1.1-inch 1200-thousand-pixel camera; meanwhile, at-30 ℃ and +70 ℃, the optical transfer function (MTF) curve graph of the lens provided by the proposal is smooth and concentrated, and the average value of the MTF of the full field of view (the half-image height Y' is 8.8mm) reaches more than 0.45, so that the high imaging quality can be still kept, the lens is ensured to be suitable for the complex environment, and all-weather high-definition video monitoring is realized.
In summary, the embodiment of the invention provides a lens with an oversized target surface, a large aperture, an athermal function and high resolution. Adopting 10 optical lenses with specific structural shapes, arranging the optical lenses in sequence from the object side to the image side according to a specific sequence, and enabling parameters such as refractive index, Abbe coefficient and the like of the optical lenses to be matched with imaging conditions through distribution of the optical power of each optical lens; therefore, on the premise of larger image surface, the requirements of an ultra-large target surface, a large aperture, poor heat dissipation and high resolution are met, and the method has excellent environmental adaptability; the method can be widely applied to the field of security monitoring, especially the field of intelligent transportation and road monitoring.
The large-target-surface lens provided by the proposal simultaneously meets the imaging of a large aperture and high resolution, and considers the problem of poor heat dissipation and day and night confocal requirements. The size of the image surface meets the requirement of 1.1' Sensor, the aperture reaches F1.3, and the low-light effect is good; the temperature compensation design is carried out in the optical design stage, so that the imaging definition of the lens is hardly reduced in an environment of-30 ℃ to +70 ℃; the back intercept is long, and the needed hardware and structural design space can be met when a double-sensor (CCD/CMOS) is used for imaging; under the condition that the MTF value of the whole view field is 100lp/mm, the average value reaches more than 0.5, and the requirement of the current 1200-ten-thousand-pixel camera on resolution ratio is met.
The embodiment of the invention provides a lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group and an image plane, wherein the first lens group, the second lens group, the third lens group, the fourth lens group and the image plane are sequentially arranged from an object side to an image side; the lens group satisfies the following conditions: f 1/f' is more than or equal to 1.21 and less than or equal to 1.41; TTL/(BFL f') is more than or equal to 2.251/2Less than or equal to 2.65; wherein f1 is a focal length of the first lens group, f' is a focal length of the lens, TTL is an optical total length of the lens, and BFL is a distance between the fourth lens group and the image plane.
Since, in the embodiment of the present invention, four lens groups are arranged in order from the object side to the image side in the lens barrel in a specific order, and the lens groups in the lens barrel satisfy: f 1/f' is more than or equal to 1.21 and less than or equal to 1.41; 2.25 ≦ TTL/((BFL. f')1/2) Less than or equal to 2.65; to a certain extent, the size and the aperture of the target surface of the lens are increased, so that the resolution of the collected image is higher, and the light transmittance of the lens can be still ensured under a low-illumination scene, so that the quality of the obtained image is better, and the reduction of the light transmittanceThe total optical length of the lens is reduced. Therefore, the embodiment of the invention provides the lens which is small in size, large in target surface size and large in aperture.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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 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 (10)
1. The lens is characterized by comprising a first lens group, a second lens group, a third lens group, a fourth lens group and an image surface which are sequentially arranged from an object side to an image side;
the lens group satisfies the following conditions:
1.21≤f1/f’≤1.41；
2.25≤TTL/((BFL*f’)1/2)≤2.65；
wherein f1 is a focal length of the first lens group, f' is a focal length of the lens, TTL is an optical total length of the lens, and BFL is a distance between the fourth lens group and the image plane.
2. The lens barrel according to claim 1, wherein the first lens group includes a first positive power lens, a first negative power lens, a second positive power lens, and a second negative power lens arranged in this order from the object side to the image side;
the curvature radius of the surface of the second positive focal power lens facing the image side is the same as that of the surface of the second negative focal power lens facing the object side;
the first positive power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the first negative power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the second positive power lens comprises a biconvex lens;
the second negative power lens includes a biconcave lens.
3. The lens barrel according to claim 1, wherein the second lens group includes a third positive power lens and a third negative power lens arranged in order from the object side to the image side;
the curvature radius of the surface of the third positive focal power lens facing the image side is the same as that of the surface of the third negative focal power lens facing the object side;
the third positive power lens comprises a biconvex lens;
the third negative power lens includes a biconcave lens.
4. The lens barrel according to claim 2, wherein the third lens group includes a fourth positive power lens and a fourth negative power lens arranged in order from the object side to the image side;
the curvature radius of the surface of the fourth positive focal power lens facing the image side is the same as that of the surface of the fourth negative focal power lens facing the object side;
the fourth positive focal power lens comprises a meniscus lens, and the surface of the meniscus lens facing the image side is a convex surface;
the fourth negative power lens includes a biconcave lens.
5. The lens barrel according to claim 1, wherein the fourth lens group includes a fifth positive power lens and a sixth positive power lens arranged in order from the object side to the image side;
the fifth positive power lens includes a biconvex lens;
the sixth positive power lens includes a convex lens whose surface facing the object side is convex.
6. The lens barrel as claimed in claim 4, wherein the abbe numbers of the second positive power lens and the fourth positive power lens are 63 or more.
7. The lens barrel as claimed in claim 3, wherein the refractive index of the third positive power lens is 1.88 or more.
8. The lens barrel according to claim 1, wherein an aperture stop is provided between the second lens group and the third lens group.
9. The lens barrel according to claim 1, wherein a light splitting device is disposed between the fourth lens group and the image plane;
the light splitting device comprises two prisms, and the joint surfaces of the two prisms are provided with film layers with light splitting functions; the light emergent side of each prism is respectively provided with a corresponding image surface;
the light reflected by the joint surface is vertical to an image surface for receiving the light.
10. The lens barrel as claimed in claim 9, wherein the light incident surface of the light splitting device forms an angle with the joining surface in a range of 30 degrees to 46 degrees.
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