CN213482544U - Imaging system - Google Patents
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- CN213482544U CN213482544U CN202022358068.0U CN202022358068U CN213482544U CN 213482544 U CN213482544 U CN 213482544U CN 202022358068 U CN202022358068 U CN 202022358068U CN 213482544 U CN213482544 U CN 213482544U
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Abstract
The utility model relates to an imaging system, including first lens battery (G1), second lens battery (G2), third lens battery (G3) and diaphragm (STO), first lens battery (G1) is fixed group, third lens battery (G3) is portable focus group, second lens battery (G2) is fixed group. The utility model discloses to present market videoconference imaging system demand and technical defect, provide a big light ring (Fno is less than or equal to 2.0), low distortion, high pixel, the image quality is even, resolution ratio reaches the imaging system more than 3000 ten thousand pixels, and has the characteristic that picture image quality remains stable under the abnormal conditions such as high temperature, low temperature concurrently simultaneously.
Description
Technical Field
The utility model relates to an optical imaging technical field especially relates to an imaging system.
Background
Along with the continuous and rapid construction of the Chinese information communication network, the Chinese communication level is greatly improved, and reliable guarantee is provided for information exchange of various industries. Video conferencing is a multimedia communication method that utilizes television technology and equipment to hold a conference via a communication network. When a video conference is held, the conference representatives in two or more different places can hear the sound of the opposite party and see the image of the opposite party, and also can see the scene of the conference room of the opposite party and the real objects, pictures, forms, files and the like displayed in the conference, thereby shortening the distance between the conference representatives, enhancing the atmosphere of the conference, leading people to be as if the people are participating in the conference at the same place and obviously improving the working efficiency.
Therefore, imaging systems for video conferencing have very high requirements on pixels, picture uniformity, distortion, color rendition, etc. However, the video conference lens in the market at present has large distortion, low picture consistency and the like, and the video conference lens has the defects of insufficient definition of imaging, low dynamic range during imaging and the like.
With the frequent application of video conferences, the requirements on the video conference imaging system are higher and higher, and the video conference lens on the market at present cannot meet the market requirements more and more, and is severely limited in some fields with higher imaging quality requirements.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an imaging system who satisfies the video conference demand.
In order to achieve the above objective, the present invention provides an imaging system, including a first lens assembly, a second lens assembly, a third lens assembly and a diaphragm, the first lens assembly is a fixed assembly, the third lens assembly is a movable focusing assembly, and the second lens assembly is a fixed assembly.
According to an aspect of the utility model, first lens battery has five pieces of lenses, includes two pieces of positive lenses and two pieces of negative lenses wherein at least, and the lens that is closest to the object space and is closest to the image space is negative lens, has two piece lens components of a lens group at least and becomes two veneer mirror groups.
According to the utility model discloses an aspect, among the first lens group, from the object space to the first piece of lens of image space for concave-convex type, the piece of lens of second is biconcave type or concave-convex type, and the piece of lens of third is biconvex type, concave-convex type or convex-flat type.
According to an aspect of the present invention, the second lens group has three lenses, wherein the three lenses include at least one positive lens and one negative lens, the lens closest to the object is the negative lens, and two lenses form a double cemented lens group;
the two lenses forming the double cemented lens group are a negative lens and a positive lens in sequence from the object space to the image space.
According to an aspect of the present invention, the third lens group has two lenses, including a negative lens and a positive lens, and has at least one lens being an aspheric lens.
According to an aspect of the present invention, the focal power of the first lens group, the second lens group and the third lens group is positive;
the stop is located between the first lens group and the second lens group;
when imaging from an infinite-distance object to a close-distance object, the third lens group moves along the optical axis to finish focusing.
According to an aspect of the present invention, the first lens group and the fixed group focal length f composed of the second lens groupMAnd the focal length f of the imaging system satisfies the following relation:
0.5≤fM/f≤2.0。
according to an aspect of the invention, the focal length f of the third lens groupG3And the focal length f of the imaging system satisfies the following relation:
1.5≤|fG3/f|≤7.5。
according to an aspect of the utility model, imaging system's optics total length TTL and focus f satisfy following relational expression:
7.76≤TTL/f≤10.82。
according to an aspect of the utility model, in the two adhesive lenses group of second battery of lens, the positive lens refracting power is ND and Abbe number satisfies following relational expression for VD:
60≤VD≤96；
and
1.43≤ND≤1.85。
according to the utility model discloses, provide an imaging system that big light ring (Fno is less than or equal to 2.0), low distortion, high pixel, image quality are even, resolution ratio reaches more than 3000 ten thousand pixels, and have the characteristic that picture image quality remains stable under the abnormal conditions such as high temperature, low temperature concurrently simultaneously.
According to an aspect of the present invention, an imaging system includes a first lens group, a second lens group, and a third lens group arranged in order from an object side to an image side along an optical axis, and a diaphragm located between the first lens group and the second lens group. The first lens group is a fixed group, and the third lens group is a movable focusing group. The focal powers of the three lens groups are positive, so that the whole imaging system has smaller distortion and smaller astigmatism by matching the focal powers. The lenses in each group are matched with proper refractive index and Abbe number, so that the imaging system has lower dispersion. Moreover, the first lens group and the second lens group jointly form a double-Gaussian-like structure, and the double-Gaussian-like structure is beneficial to reducing aberrations such as distortion, field curvature and astigmatism of the system.
According to the utility model discloses a scheme, first lens battery has five pieces of lenses, includes two pieces of positive lenses and two pieces of negative lenses wherein at least, has two pieces of lens battery group to become two cemented lens group, and the lens that is closest to the object space and is closest to the image space is negative lens. And the first lens from the object space to the image space is of a convex-concave type, the second lens is of a biconcave type or a concave-convex type, and the third lens is of a biconvex type, a convex-concave type or a convex-flat type. The first lens group is located at the front end of the imaging system, and the negative lens can well converge light rays, so that the imaging system has a larger space-free imaging range. The double-cemented lens is matched with proper focal power, and has good effect on the distortion, the coma aberration and the lateral chromatic aberration of the correction system, thereby ensuring that the optical system has the consistency of image quality and image surface close to the diffraction limit.
According to the utility model discloses a scheme, the second lens battery has three pieces of lens, includes a piece of positive lens and a piece of negative lens wherein at least, has two pieces of lens to become two cemented lens group, and the lens that is closest to the object space is negative lens. Moreover, the two lenses forming the double cemented lens set are a negative lens and a positive lens in sequence from the object side to the image side. The use of the double combined lens group in the second lens group, with proper focal power, can be matched with the first lens group to correct spherical aberration, astigmatism, coma and distortion in the focusing lens group. Meanwhile, the burden proportion of the first lens group to aberration correction is reduced, and the tolerance sensitivity of the movable group can be better reduced, so that the optical system is greatly ensured to have good image plane consistency, and the imaging quality of the optical system is comprehensively improved.
According to the utility model discloses a scheme, the third lens group has two pieces of lenses, includes a piece of negative lens and a piece of positive lens wherein, and has at least a piece of lens to be aspheric lens. Therefore, the utility model discloses in, the group of focusing is favorable to the reduction of image plane incident angle through positive and negative lens collocation to also have the effect that reduces the imaging system aberration. The aspheric lens is used for correcting and balancing system aberration.
According to the utility model discloses a scheme has contained two gauss structures among the imaging system to light is restrainted to the correction distortion that can be fine, eliminates the vignetting, reduces the spherical aberration.
According to the utility model discloses a scheme, the fixed battery of lens focus f that first battery of lens and second battery of lens are constituteedMAnd the focal length f of the imaging system satisfies the following relation: f is not less than 0.5MThe/f is less than or equal to 2.0. Meeting this requirement can enable the optical system to achieve and maintain less distortion while collecting incident light rays quickly, reducing curvature of field and astigmatism. Focal length f of the third lens groupG3And the focal length f of the imaging system satisfies the following relation: f is more than or equal to 1.5G3The/| is less than or equal to 7.5. The requirement is met, the high focusing efficiency can be ensured, and meanwhile, the corresponding focusing sensitivity can be ensured according to the requirement; meanwhile, the burden proportion of the first lens group and the second lens group of the optical system on aberration correction is balanced by reasonably matching the positive and negative focal powers and the focal powers of the first lens group and the second lens group. The total optical length TTL and the focal length f of the imaging system satisfy the following relational expression: TTL/f is more than or equal to 7.76 and less than or equal to 10.82. Of the second lens groupIn the double-cemented lens group, the refractive index ND and Abbe number VD of the positive lens satisfy the following relational expression: VD is more than or equal to 60 and less than or equal to 96; ND is more than or equal to 1.43 and less than or equal to 1.85. The condition of the focal power and the Abbe number is satisfied, the chromatic aberration of the imaging system can be effectively corrected, and the imaging quality of the imaging system is improved. Meanwhile, the positive lens greatly contributes to maintaining the stability of the image plane of the imaging system in an extremely warm state.
Drawings
Fig. 1 schematically shows a block diagram of an image forming system according to a first embodiment of the present invention;
fig. 2 schematically shows an MTF plot in focus for an optimal working object distance for an imaging system according to a first embodiment of the invention;
fig. 3 schematically shows an optical distortion diagram of an imaging system according to a first embodiment of the present invention;
fig. 4 schematically shows a block diagram of an imaging system according to a second embodiment of the present invention;
fig. 5 schematically shows an MTF plot in focus for an optimal working object distance for an imaging system according to a second embodiment of the invention;
fig. 6 schematically shows an optical distortion diagram of an imaging system according to a second embodiment of the present invention;
fig. 7 schematically shows a block diagram of an image forming system according to a third embodiment of the present invention;
fig. 8 schematically shows an MTF plot in focus for an optimal working object distance for an imaging system according to a third embodiment of the present invention;
fig. 9 schematically shows an optical distortion diagram of an imaging system according to a third embodiment of the present invention;
fig. 10 schematically shows a structural view of an image forming system according to a fourth embodiment of the present invention;
fig. 11 schematically shows an MTF diagram in focus for an optimal working object distance of an imaging system according to a fourth embodiment of the invention;
fig. 12 schematically shows an optical distortion diagram of an imaging system according to a fourth embodiment of the present invention;
fig. 13 schematically shows a structural view of an image forming system according to a fifth embodiment of the present invention;
fig. 14 schematically shows an MTF plot in focus for an optimal working object distance for an imaging system according to a fifth embodiment of the invention;
fig. 15 schematically shows an optical distortion diagram of an imaging system according to a fifth embodiment of the present invention.
Detailed Description
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 embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.
Referring to fig. 1, the imaging system of the present invention includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged in this order from an object side to an image side along an optical axis, and a stop STO between the first lens group G1 and the second lens group G2. The first lens group G1 is a fixed group, and the third lens group G3 is a movable focusing group. According to the utility model discloses a conceive, second lens group G2 is also for fixed group, so can realize that first lens group G1 and second lens group G2 have constituted class double gauss structure jointly, are good to aberration such as distortion, field curvature, astigmatism that reduce the system. The utility model discloses in, the focal power of three lens system is just, so through the collocation of focal power for whole imaging system possesses less distortion and less astigmatism. The lenses in each group are matched with proper refractive index and Abbe number, so that the imaging system has lower dispersion.
The utility model discloses in, first lens group G1 has five pieces of lenses, includes two pieces of positive lenses and two pieces of negative lenses wherein at least, has two pieces of lens group to become two cemented mirror groups at least, and the lens that is closest to the object space and is closest to the image space is negative lens. And the first lens from the object space to the image space is of a convex-concave type, the second lens is of a biconcave type or a concave-convex type, and the third lens is of a biconvex type, a convex-concave type or a convex-flat type. The first lens group G1 is located at the front end of the imaging system, wherein the negative lens can well converge light, so that the imaging system has a large imaging range without space. The double-cemented lens is matched with proper focal power, and has good effect on the distortion, the coma aberration and the lateral chromatic aberration of the correction system, thereby ensuring that the optical system has the consistency of image quality and image surface close to the diffraction limit.
The utility model discloses in, second lens group G2 has three pieces of lenses, includes a piece of positive lens and a piece of negative lens wherein at least, has two pieces of lens group to become two cemented mirror groups, and the lens that is closest to the object space is negative lens. Moreover, the two lenses forming the double cemented lens set are a negative lens and a positive lens in sequence from the object side to the image side. The use of the double-lens combination in the second lens group G2, in combination with a suitable focal power, can be used in combination with the first lens group G1 to correct spherical aberration, astigmatism, coma and distortion in the focusing lens group. Meanwhile, the burden proportion of the first lens group G1 on aberration correction is reduced, and the tolerance sensitivity of the movable group can be better reduced, so that the optical system is greatly ensured to have good image plane consistency, and the imaging quality of the optical system is comprehensively improved.
The utility model discloses in, third lens group G3 has two pieces of lenses, including a piece of negative lens and a piece of positive lens wherein, and has at least a piece of lens to be aspheric lens. Therefore, the utility model discloses in, the group of focusing is favorable to the reduction of image plane incident angle through positive and negative lens collocation to also have the effect that reduces the imaging system aberration. The aspheric lens is used for correcting and balancing system aberration.
Therefore, the utility model discloses an image system has contained two gauss structures to the correction distortion that can be fine is restrainted light, eliminates the vignetting, reduces the spherical aberration.
The utility model discloses in, the fixed lens group focus f that first lens group G1 and second lens group G2 are constituteedMAnd the focal length f of the imaging system satisfies the following relation: f is not less than 0.5MThe/f is less than or equal to 2.0. Meeting this requirement can enable the optical system to achieve and maintain less distortion while collecting incident light rays quickly, reducing curvature of field and astigmatism. Focal length f of third lens group G3G3And the focal length f of the imaging system satisfies the following relation: f is more than or equal to 1.5G3The/| is less than or equal to 7.5. The requirement is met, the high focusing efficiency can be ensured, and meanwhile, the corresponding focusing sensitivity can be ensured according to the requirement; meanwhile, the burden proportion of the first lens group G1 and the second lens group G2 of the optical system on aberration correction is balanced by reasonably matching the positive and negative focal power and the focal power of the first lens group and the second lens group. The total optical length TTL and the focal length f of the imaging system satisfy the following relational expression: TTL/f is more than or equal to 7.76 and less than or equal to 10.82. In the double-cemented lens group of the second lens group G2, the positive lens refractive index ND and the abbe number VD satisfy the following relations: VD is more than or equal to 60 and less than or equal to 96; ND is more than or equal to 1.43 and less than or equal to 1.85. The condition of the focal power and the Abbe number is satisfied, the chromatic aberration of the imaging system can be effectively corrected, and the imaging quality of the imaging system is improved. Meanwhile, the positive lens greatly contributes to maintaining the stability of the image plane of the imaging system in an extremely warm state.
The imaging system of the present invention will be described in detail below with reference to five embodiments set forth in the above-described arrangement of the present invention. In the following embodiments, the surfaces of the respective lenses are denoted by sur1, sur2, … and surN, in which the cemented surface of the cemented lens group is one surface and the stop is STO. The parameter settings of the respective embodiments satisfy the following table 1:
TABLE 1
The surface types of all the aspherical lenses satisfy the aspherical equation:
Z＝CY2/{1+[1-(1+K)C2Y2]1/2}+A4Y4+A6Y6+A8Y8+A10Y10+A12Y12+A14Y14
wherein, the parameter C is the curvature corresponding to the radius of the aspheric lens, Y is the radial coordinate of the aspheric lens, the unit is the same as the lens length unit, K is the conic coefficient of the aspheric lens, A4，A6…A12Respectively, corresponding order coefficients of the aspheric surface.
Referring to fig. 1, in the following embodiments, the first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, which are arranged in order along an optical axis. The fourth lens element L4 and the fifth lens element L5 form a double lens assembly. The second lens group G2 includes a sixth lens L6, a seventh lens L7, and an eighth lens L8, which are arranged in order along the optical axis. The sixth lens element L6 and the seventh lens element L7 form a double lens assembly. The third lens group G3 includes a ninth lens L9 and a tenth lens L10 arranged in order along the optical axis.
The first embodiment:
as shown in fig. 1, in the present embodiment, the second lens L2 is of a biconcave type, and the third lens L3 is of a biconvex type. The parameters of the imaging system in this embodiment are as follows:
the total length TTL of the system is 33 mm; the system focal length f is 4.3 m; the system imaging object distance range is 0.3 m-inf. Other parameters are shown in table 2 below:
TABLE 2
The following table 3 shows aspheric coefficients of the aspheric lenses in the present embodiment, where K is a conic constant of the surface, and a4、A6、A8、A10Aspheric coefficients of fourth, sixth, eighth and tenth orders, respectively:
| noodle numbering | K | A4 | A6 | A8 | A10 |
| sur16 | 5.17 | -5.28E-04 | 4.37E-06 | 2.46 |
0 |
| sur17 | -13.75 | -2.20E-03 | -6.82E-06 | 2.09 |
0 |
| sur18 | 5.52 | -2.57E-04 | -2.02E-04 | 6.04 |
0 |
| sur19 | -53.16 | 1.24E-03 | -1.68E-04 | 4.76 |
0 |
TABLE 3
With reference to fig. 2 and 3, the imaging system of the present embodiment has an obvious effect on correcting aberration of the imaging system by using the aspheric lens, and can better improve image quality and make it easier to reach a diffraction limit.
The second embodiment:
as shown in fig. 4, in the present embodiment, the second lens L2 is of a concave-convex type, and the third lens L3 is of a biconvex type. The parameters of the imaging system in this embodiment are as follows:
the total length TTL of the system is 36.4 mm; the focal length f of the system is 3.85 mm; the system imaging object distance range is 0.3 m-inf. Other parameters are shown in table 4 below:
TABLE 4
The following table 5 shows aspheric coefficients of the aspheric lenses in the present embodiment, where K is a conic constant of the surface, and a4、A6、A8、A10Aspheric coefficients of fourth, sixth, eighth and tenth orders, respectively:
| noodle numbering | K | A4 | A6 | A8 | A10 |
| sur16 | -9.21 | -4.35E-04 | 3.65E-05 | 5.56 |
0 |
| sur17 | 12.75 | -1.95E-03 | -4.52E-05 | 2.39 |
0 |
| sur18 | 6.52 | -2.11E-04 | -3.02E-06 | 6.14 |
0 |
| sur19 | -9.16 | 1.15E-03 | -2.68E-06 | 1.76 |
0 |
TABLE 5
With reference to fig. 5 and 6, the imaging system of the present embodiment employs an aspheric lens, which has a significant effect on correcting aberration of the imaging system, and can better improve image quality and make it easier to reach a diffraction limit.
Third embodiment:
as shown in fig. 7, in the present embodiment, the second lens L2 is of a biconcave type, and the third lens L3 is of a convex-concave type. The parameters of the imaging system in this embodiment are as follows:
the total length TTL of the system is 37 mm; the focal length f of the system is 3.9 mm; the system imaging object distance range is 0.3 m-inf; other parameters are shown in table 6 below:
TABLE 6
The following table 7 shows aspheric coefficients of the aspheric lenses in the present embodiment, where K is a conic constant of the surface, and a4、A6、A8、A10Respectively four orders and six ordersAspheric coefficients of order eight and order ten:
| noodle numbering | K | A4 | A6 | A8 | A10 |
| sur16 | -7.51 | -2.55E-04 | 5.25E-06 | 7.56 |
0 |
| sur17 | 7.42 | -5.35E-04 | -3.12E-06 | 5.39 |
0 |
| sur18 | 6.52 | -1.61E-04 | -5.12E-06 | 6.14 |
0 |
| sur19 | -19.26 | 4.32E-03 | -3.38E-06 | 8.76 |
0 |
TABLE 7
With reference to fig. 8 and 9, the imaging system of the present embodiment employs an aspheric lens, which has a significant effect on correcting aberration of the imaging system, and can better improve image quality, so that the imaging system can more easily reach a diffraction limit.
Fourth embodiment:
as shown in fig. 10, in the present embodiment, the second lens L2 is of a biconcave type, and the third lens L3 is of a convex-flat type. The parameters of the imaging system in this embodiment are as follows:
the total length TTL of the system is 36 mm; the focal length f of the system is 3.9 mm; the system imaging object distance range is 0.3 m-inf; other parameters are shown in table 8 below:
TABLE 8
The following table 9 shows aspheric coefficients of the aspheric lenses in the present embodiment, where K is a conic constant of the surface, and a4、A6、A8、A10Aspheric coefficients of fourth, sixth, eighth and tenth orders, respectively:
| noodle numbering | K | A4 | A6 | A8 | A10 |
| sur16 | -16.28 | -3.45E-04 | 4.35E-06 | 6.46 |
0 |
| sur17 | 6.82 | -6.25E-04 | -2.32E-06 | 3.19 |
0 |
| sur18 | 5.43 | -2.71E-04 | -4.82E-06 | 5.24 |
0 |
| sur19 | -9.16 | 3.71E-03 | -6.88E-06 | 7.36 |
0 |
TABLE 9
With reference to fig. 11 and 12, the imaging system of this embodiment employs an aspheric lens, which has a significant effect on correcting aberration of the imaging system, and can better improve image quality, so that the imaging system can more easily reach a diffraction limit.
Fifth embodiment:
as shown in fig. 13, in the present embodiment, the second lens L2 is of a biconcave type, and the third lens L3 is of a biconvex type. The parameters of the imaging system in this embodiment are as follows:
the total length TTL of the system is 39.5 mm; the focal length f of the system is 3.65 mm; the system imaging object distance range is 0.3 m-inf; other parameters are shown in table 10 below:
watch 10
The following table 11 shows aspheric coefficients of the aspheric lenses in the present embodiment, where K is a conic constant of the surface, and a4、A6、A8、A10Aspheric coefficients of fourth, sixth, eighth and tenth orders, respectively:
| noodle numbering | K | A4 | A6 | A8 | A10 |
| sur16 | -3.28 | -3.35E-04 | 4.55E-06 | 1.36 |
0 |
| sur17 | 6.82 | -6.15E-04 | -2.72E-06 | 1.29 |
0 |
| sur18 | 5.43 | -2.21E-04 | -4.32E-06 | 1.34 |
0 |
| sur19 | -9.16 | 3.61E-04 | -6.58E-06 | 1.16 |
0 |
TABLE 11
With reference to fig. 14 and fig. 15, the imaging system of this embodiment employs an aspheric lens, which has a significant effect on correcting aberration of the imaging system, and can better improve image quality, so that the imaging system can more easily reach a diffraction limit.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An imaging system comprising a first lens group (G1), a second lens group (G2), a third lens group (G3) and a Stop (STO), the first lens group (G1) being a fixed group, the third lens group (G3) being a movable focusing group, characterized in that the second lens group (G2) is a fixed group.
2. The imaging system of claim 1, wherein the first lens group (G1) has five lenses, at least two positive lenses and two negative lenses, and the lenses closest to the object and the image are both negative lenses, at least two lenses forming a double cemented lens group.
3. The imaging system of claim 2, wherein in the first lens group (G1), a first lens from an object side to an image side is concave-convex, a second lens is concave-convex or concave-convex, and a third lens is convex-convex, concave-convex or convex-flat.
4. The imaging system of claim 1, wherein the second lens group (G2) has three lenses, at least one positive lens and one negative lens, the lens closest to the object is the negative lens, and two lenses form a double cemented lens group;
the two lenses forming the double cemented lens group are a negative lens and a positive lens in sequence from the object space to the image space.
5. The imaging system of claim 1, wherein the third lens group (G3) has two lenses, including a negative lens and a positive lens, and at least one of the lenses is an aspheric lens.
6. The imaging system of claim 1, wherein the optical powers of the first lens group (G1), the second lens group (G2), and the third lens group (G3) are all positive;
the Stop (STO) is located between the first lens group (G1) and the second lens group (G2);
when imaging from an infinite-distance object to a close-distance object, the third lens group (G3) moves along the optical axis to complete focusing.
7. The imaging system of any of claims 1-6, wherein the first lens group (G1) and the second lens group (G2) constitute a fixed group focal length fMAnd the focal length f of the imaging system satisfies the following relation:
0.5≤fM/f≤2.0。
8. the imaging system according to any of claims 1-6, characterized in that the focal length f of the third lens group (G3)G3And the focal length f of the imaging system satisfies the following relation:
1.5≤|fG3/f|≤7.5。
9. the imaging system of any of claims 1-6, wherein the full optical length, TTL, and the focal length, f, of the imaging system satisfy the following relationship:
7.76≤TTL/f≤10.82。
10. an imaging system according to claim 4, wherein said double cemented lens group of the second lens group (G2) has a positive lens refractive index ND and an Abbe number VD satisfying the following relation:
60≤VD≤96；
and
1.43≤ND≤1.85。
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