CN217385977U - Optical imaging system - Google Patents
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- CN217385977U CN217385977U CN202221030339.2U CN202221030339U CN217385977U CN 217385977 U CN217385977 U CN 217385977U CN 202221030339 U CN202221030339 U CN 202221030339U CN 217385977 U CN217385977 U CN 217385977U
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Abstract
The utility model relates to an optical imaging system, include: the zoom lens comprises a first lens group with positive focal power, a second lens group with positive focal power, a third lens group with negative focal power, a fourth lens group and a fifth lens group with positive focal power, wherein the first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group are sequentially arranged along the direction from an object side to an image side along an optical axis, an aperture stop is arranged between the third lens group and the fourth lens group, the fourth lens group has negative focal power, the first lens group at least comprises one lens with positive focal power and one lens with negative focal power, in the zooming process, the second lens group and the fifth lens group are fixedly arranged, the third lens group and the fourth lens group synchronously move along the optical axis to realize zooming, and the first lens group moves along the optical axis to realize focusing. The utility model discloses have low distortion, high distance heart degree, high extension, high resolution, highlight axle stability and high low temperature and need not the performance of refocusing.
Description
Technical Field
The utility model relates to an optical imaging system technical field who comprises optical element.
Background
The industrial lens is an important optical element in the field of machine vision, and the traditional industrial lens has larger perspective parallax due to different magnifications at different object distances, so that the requirement of high-precision measurement is difficult to meet. The telecentric lens can eliminate the perspective parallax caused by different object distances, and the image magnification ratio is kept unchanged within a certain object distance range.
However, with the continuous development of the industry, the precision of the precision detection is gradually improved, and the accuracy and the convenience in operation are also increased. In response to these requirements, the conventional telecentric lens has the following disadvantages:
(1) most of the existing double telecentric lenses have limited measurement range and low object image magnification, and the performance of the lenses is easily influenced by environmental factors such as temperature and the like.
(2) For a telecentric lens with fixed magnification, the detection field of vision is single, only a workpiece with a specific size can be detected, when the application requirement changes, the telecentric lens with different multiplying power needs to be replaced, and the correction is repeated, the process is complicated, the enterprise cost is increased, and the resource waste is caused.
In order to solve the above problems, zoom telecentric lenses are available on the market, but most of them are object-side telecentric, that is, only the object-side telecentric property is ensured in the zoom process, and the image side does not have telecentric property, which may cause the position offset of the imaging sensor to bring errors to the measurement result. In order to solve the above-mentioned deficiencies, the development of a double telecentric system capable of continuously changing magnification and high telecentricity is very important.
SUMMERY OF THE UTILITY MODEL
To solve the problems of the prior art, the present invention provides an optical imaging system with low distortion, high telecentricity, high expansion (ratio between 3.15X for maximum magnification and 0.315X for minimum magnification), high resolution, high optical axis stability and high and low temperature without refocusing.
To achieve the above object, the present invention provides an optical imaging system, including: the zoom lens comprises a first lens group with positive focal power, a second lens group with positive focal power, a third lens group with negative focal power, a fourth lens group and a fifth lens group with positive focal power, wherein the first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group are sequentially arranged in the direction from the object side to the image side along an optical axis, an aperture stop is arranged between the third lens group and the fourth lens group, the fourth lens group has negative focal power, the second lens group and the fifth lens group are fixedly arranged in the zooming process, the third lens group and the fourth lens group synchronously move along the optical axis to realize zooming, and the first lens group moves along the optical axis to realize focusing.
According to an aspect of the utility model, first lens crowd with be equipped with semi-transparent semi-reflection beam splitting device between the second lens crowd, and semi-transparent semi-reflection beam splitting device's top sets up the light source transmitter.
According to the utility model discloses a scheme, optical imaging system adopts "a compensation, two fixed and two optical structure of becoming doubly" five crowd's framework, realize the low power to the 10 times extension (magnification ratio) of high power, ratio between maximum magnification 3.15X and the minimum magnification 0.315X promptly, combine the collocation use of positive and negative lens and cemented mirror simultaneously, correction system's aberration, distortion and telecentricity, reduce the tolerance sensitivity, realize higher picture color reducibility when guaranteeing the picture degree of consistency, have the low distortion, high telecentricity, high resolution, highlight axis stability and high low temperature need not the continuous variable power imaging performance of refocusing.
According to an aspect of the present invention, the optical imaging system has a center distance d between the last surface of the third lens group and the first surface of the fourth lens group at the time of low power 34t And the central distance d between the last surface of the third lens group and the first surface of the fourth lens group when the optical imaging system is in high power 34w And a focal length f of the third lens group 3 The following conditions are satisfied: less than or equal to 0.4 (d) 34t -d 34w )/f 3 And | is less than or equal to 1.3, so that the aberration generated between the third lens group and the fourth lens group can be effectively reduced, and the distortion and the telecentricity of the system can be reduced.
According to an aspect of the present invention, the focal length f of the third lens group 3 And a focal length f of the fourth lens group 4 The following conditions are satisfied: f is more than or equal to 0.9 3 |/|f 4 The | < 2 > can improve the low-power resolution of the optical imaging systemAnd meanwhile, large-magnification zooming can be achieved, and the system can keep good resolution performance in the whole zooming process.
According to an aspect of the present invention, the refractive index ND of at least one positive refractive power lens of the first lens group (Lk) And Abbe number VD (Lk) The following conditions are respectively satisfied: ND not less than 1.4 (Lk) ≤1.65；60≤VD (Lk) Is less than or equal to 95. Refractive index ND of at least one lens with positive focal power in the fifth lens group (Lh) And Abbe number VD (Lh) The following conditions are respectively satisfied: ND not less than 1.4 (Lh) ≤1.65；60≤VD (Lh) 95, the chromatic aberration and distortion of the third lens group and the fourth lens group can be more effectively corrected, thereby improving the imaging quality of the optical imaging system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the 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.
Fig. 1A and 1B are schematic diagrams illustrating a low power and high power optical imaging system according to embodiment 1 of the present invention, respectively;
fig. 1C and 1D schematically show a magnification chromatic aberration diagram and a distortion diagram of a low-magnification optical imaging system in embodiment 1 of the present invention, respectively;
fig. 1E and 1F schematically show a magnification chromatic aberration diagram and a distortion diagram of a high-power optical imaging system in embodiment 1 of the present invention, respectively;
fig. 2A and 2B are schematic diagrams illustrating the structures of the low power and high power optical imaging systems according to embodiment 2 of the present invention, respectively;
fig. 2C and 2D schematically show a magnification chromatic aberration diagram and a distortion diagram of a low-magnification optical imaging system in embodiment 2 of the present invention, respectively;
fig. 2E and 2F schematically show a magnification chromatic aberration diagram and a distortion diagram of a high-power optical imaging system in embodiment 2 of the present invention, respectively;
fig. 3A and 3B are schematic diagrams illustrating the structures of the low power and high power optical imaging systems according to embodiment 3 of the present invention, respectively;
fig. 3C and 3D schematically show a magnification chromatic aberration diagram and a distortion diagram of a low-magnification optical imaging system in embodiment 3 of the present invention, respectively;
fig. 3E and 3F schematically show a magnification chromatic aberration diagram and a distortion diagram of a high-power optical imaging system in embodiment 3 of the present invention, respectively;
fig. 4A and 4B are schematic diagrams illustrating the structures of the low power and high power optical imaging systems according to embodiment 4 of the present invention, respectively;
fig. 4C and 4D schematically show a magnification chromatic aberration diagram and a distortion diagram of a low-magnification optical imaging system in embodiment 4 of the present invention, respectively;
fig. 4E and 4F schematically show a magnification chromatic aberration diagram and a distortion diagram of a high-power optical imaging system in embodiment 4 of the present invention, respectively;
fig. 5A and 5B are schematic diagrams illustrating the structures of the low power and high power optical imaging systems according to embodiment 5 of the present invention, respectively;
fig. 5C and 5D schematically show a magnification chromatic aberration diagram and a distortion diagram of a low-magnification optical imaging system in embodiment 5 of the present invention, respectively;
fig. 5E and 5F schematically show a magnification chromatic aberration diagram and a distortion diagram of a high-power optical imaging system in embodiment 5 of the present invention, respectively;
fig. 6A and 6B are schematic diagrams illustrating the structures of the low power and high power optical imaging systems according to embodiment 6 of the present invention, respectively;
fig. 6C and 6D schematically show a magnification chromatic aberration diagram and a distortion diagram of a low-magnification optical imaging system in embodiment 6 of the present invention, respectively;
fig. 6E and 6F schematically show a magnification chromatic aberration diagram and a distortion diagram of a high-power optical imaging system in embodiment 6 of the present invention, respectively;
fig. 7A and 7B are schematic diagrams illustrating the structures of the low power and high power optical imaging systems according to embodiment 7 of the present invention, respectively;
fig. 7C and 7D schematically show a magnification chromatic aberration diagram and a distortion diagram of a low-magnification optical imaging system in embodiment 7 of the present invention, respectively;
fig. 7E and 7F schematically show a magnification chromatic aberration diagram and a distortion diagram of a high-power optical imaging system in embodiment 7 of the present invention, respectively;
fig. 8A and 8B are schematic diagrams illustrating the structures of the low power and high power optical imaging systems according to embodiment 8 of the present invention, respectively;
fig. 8C and 8D schematically show a magnification chromatic aberration diagram and a distortion diagram of a low-magnification optical imaging system in embodiment 8 of the present invention, respectively;
fig. 8E and 8F schematically show a magnification chromatic aberration diagram and a distortion diagram of a high-power optical imaging system according to embodiment 8 of the present invention, respectively.
Detailed Description
The description of the embodiments of this specification is intended to be taken in conjunction with the accompanying drawings, which are to be considered part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and simplified or conveniently indicated. Further, the components of the structures in the drawings are described separately, and it should be noted that the components not shown or described in the drawings are well known to those skilled in the art.
Any reference to directions and orientations to the description of the embodiments herein is merely for convenience of description and should not be construed as limiting the scope of the present invention in any way. The following description of the preferred embodiments refers to combinations of features which may be present independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.
According to an embodiment of the present invention, as shown in fig. 5A and 5B, for example, an optical imaging system includes: the first lens group G1 having positive power, the second lens group G2 having positive power, the third lens group G3 having negative power, the aperture stop STO, the fourth lens group G4 having negative power, and the fifth lens group G5 having positive power are arranged in this order from the object side to the image side along the optical axis. In the magnification varying process, the second lens group G2 and the fifth lens group G5 are fixedly disposed, and the third lens group G3 and the fourth lens group G4 are synchronously moved along the optical axis for achieving magnification variation, performing magnification variation from low magnification to high magnification. Meanwhile, the first lens group G1 moves along the optical axis to realize focusing, and the change of the image plane position in the zooming process is realized.
The first lens group G1 is a compensation group. The first lens group G1 is moved to focus under different magnifications, so that the imaging quality under different object distances can be effectively improved, and the uniformity of pictures is ensured. Meanwhile, the spherical aberration, distortion and telecentricity of the optical imaging system can be corrected, tolerance sensitivity is reduced, and emergent rays are ensured to be emergent almost in parallel. The second lens group G2 is a fixed group, and mainly functions to correct the aberration and distortion of the system, and simultaneously reduces the tolerance sensitivity, which is beneficial to balance the image plane offset at high and low temperatures. The third lens group G3 and the fourth lens group G4 are variable power groups, and preferably, the third lens group G3 and the fourth lens group G4 are synchronously moved along the optical axis of the optical imaging system by a common driving device to perform variable power from low power to high power, while facilitating correction of system distortion and telecentricity. The fifth lens group G5 is also a fixed group, and mainly functions to correct aberration, distortion and telecentricity of the system, reduce tolerance sensitivity, ensure uniformity of the image, and facilitate balancing of image plane offset of the system at high and low temperatures.
According to an embodiment of the present invention, the first lens group G1 includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2 and a third lens L3, wherein at least one lens has positive focal power, at least one lens has negative focal power, and two or three adjacent lenses of the first lens L1, the second lens L2 and the third lens L3 are cemented together to form a cemented lens group. Through the matching use of the focal powers of the positive and negative lenses, the optical imaging system can smoothly collect incident light, is favorable for correcting spherical aberration, distortion and telecentricity inside the first lens group G1, can reduce tolerance sensitivity in the first lens group G1, ensures that emergent light rays are emergent almost in parallel, and can reduce astigmatism generated by the system.
According to an embodiment of the present invention, the second lens group G2 includes a fourth lens L4 having positive optical power, and the fourth lens L4 is a convex-concave lens or a convex-convex lens. The main function of the arrangement is to correct the aberration and distortion of the system, and is beneficial to balancing the image surface offset under high and low temperatures. Meanwhile, the correction of the aberration in the second lens group G2 is beneficial to reducing the burden proportion of the first lens group G1 on aberration correction, so that the tolerance sensitivity of the movable group can be better reduced, and the imaging quality of the optical imaging system is comprehensively improved.
According to an embodiment of the present invention, the third lens group G3 includes, in order from the object side to the image side along the optical axis, a fifth lens L5 having positive optical power and a sixth lens L6 having negative optical power, and the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens group. The use of cemented lenses in the specific locations mentioned above facilitates correction of system distortion, telecentricity and tolerance sensitivity and allows synchronized movement along the optical axis of the system, achieving a magnification variation from low to high.
According to an embodiment of the present invention, the fourth lens group G4 includes, in order from the object side to the image side along the optical axis, a seventh lens L7 having negative optical power and an eighth lens L8 having positive optical power, and the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented lens group. The use of the cemented lens at the above-mentioned specific positions is advantageous for correcting the distortion and telecentricity of the system and for performing the zoom from low magnification to high magnification by moving synchronously along the optical axis of the system. The correction of the aberration in the fourth lens group G4 is beneficial to reducing the burden proportion of the first lens group G1 on aberration correction, so that the tolerance sensitivity of the movable group can be better reduced, and the imaging quality of the optical imaging system is comprehensively improved.
According to an embodiment of the present invention, the fifth lens group G5 includes, in order from the object side to the image side along the optical axis, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and a twelfth lens L12. The three lenses have positive focal power, one lens has negative focal power, and two or three adjacent lenses of the ninth lens L9, the tenth lens L10, the eleventh lens L11 and the twelfth lens L12 are cemented to form a cemented lens group. Through the focal power collocation of positive and negative lens and the use of cemented mirror, the main effect reduces the tolerance sensitivity simultaneously for the aberration of correction system, distortion and telecentricity, guarantees the homogeneity of picture, is favorable to balancing image plane skew under high and low temperature, guarantees sufficient back focus and great formation of image frame, is favorable to reaching less chief ray incident angle simultaneously, realizes higher picture color reducing nature.
According to another embodiment of the present invention, as shown in fig. 1A and 1B, the optical imaging system further includes a transflective beam splitter L. The device is arranged between a first lens group G1 and a second lens group G2, and a light source emitter is arranged above the semi-transparent semi-reflecting light splitting device L. So set up, semi-transparent semi-reflecting beam splitting device L and light source transmitter collocation use can guarantee that light source transmitter emergent light axis passes through the crossing point of optical imaging system optical axis and semi-transparent semi-reflecting beam splitting device, are favorable to the demarcation of actual measurement object information, improve detection efficiency.
According to another embodiment of the present invention, the third lens group G3 includes, in order from the object side to the image side along the optical axis, a fifth lens L5 having positive or negative optical power and a sixth lens L6 having positive or negative optical power, and the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens group. The cemented mirror is arranged at the specific position, which is beneficial to correcting system distortion, telecentricity and tolerance sensitivity, and synchronously moves along the optical axis of the optical imaging system to carry out zooming from low power to high power.
According to another embodiment of the present invention, the fourth lens group G4 comprises, in order from the object side to the image side along the optical axis, a seventh lens L7 having positive or negative optical power and an eighth lens L8 having positive or negative optical power, the seventh lens L7 and the eighth lens L8 being cemented together to form a cemented lens group. The cemented lens is arranged at the specific position, which is beneficial to correcting the distortion and the telecentricity of the system, and synchronously moves along the optical axis of the optical imaging system to perform the zooming from low power to high power. The correction of the aberration in the fourth lens group G4 is beneficial to reducing the burden proportion of the first lens group G1 on aberration correction, and can better reduce the tolerance sensitivity of the movable group and comprehensively improve the imaging quality of the optical imaging system.
According to another embodiment of the present invention, the fifth lens group G5 includes, in order from the object side to the image side along the optical axis, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12, wherein at least two lenses have positive focal power, at least one lens has negative focal power, and two or three adjacent lenses of the ninth lens L9, the tenth lens L10, the eleventh lens L11 and the twelfth lens L12 are cemented together to form a cemented lens group. Through the focal power collocation of positive and negative lenses and the use of a cemented mirror, the aberration, distortion and telecentricity of a correction system are mainly corrected, the tolerance sensitivity is reduced, the uniformity of pictures is ensured, the balance of image surface deviation under high and low temperatures is facilitated, sufficient back focus and a larger imaging picture are ensured, the small principal ray incident angle is facilitated to be reached, and the high picture color reducibility is realized.
The relative structures, powers, and the like of the first lens group G1 and the second lens group G2 in another embodiment of the present invention are the same as those in one embodiment of the present invention, and the description thereof is omitted.
In an embodiment of the present invention, the distance d between the last surface of the third lens group G3 and the first surface of the fourth lens group G4 is a center of the optical imaging system at low magnification 34t And the center distance d between the last surface of the third lens group G3 and the first surface of the fourth lens group G4 when the optical imaging system is at high magnification 34w And a focal length f of the third lens group G3 3 The following conditions are satisfied: is not less than 0.4 | (d) 34t -d 34w )/f 3 Less than or equal to 1.3. With this arrangement, it is possible to effectively reduce aberration generated between the third lens group G3 and the fourth lens group G4, while also reducing distortion and telecentricity of the system.
In an embodiment of the present invention, the focal length f of the third lens group G3 3 And a focal length f of the fourth lens group G4 4 The following conditions are satisfied: f is more than or equal to 0.9 3 |/|f 4 Less than or equal to 2. So set up, can promote the resolution power of this optical imaging system low powerMeanwhile, large-magnification zooming can be achieved, and the system can keep good resolution performance in the whole zooming process.
In an embodiment of the present invention, the refractive index ND of at least one lens with positive refractive power in the first lens group G1 (Lk) And Abbe number VD (Lk) The following conditions are respectively satisfied: ND not less than 1.4 (Lk) ≤1.65；60≤VD (Lk) Is less than or equal to 95. The refractive index ND of at least one positive-power lens in the fifth lens group G5 (Lh) And Abbe number VD (Lh) The following conditions are respectively satisfied: ND not less than 1.4 (Lh) ≤1.65；60≤VD (Lh) Is less than or equal to 95. With this arrangement, chromatic aberration and distortion of the third lens group G3 and the fourth lens group G4 can be more effectively corrected, thereby improving the imaging quality of the optical imaging system.
To sum up, the utility model discloses an optical imaging system has low distortion, high distance heart degree, minimum magnification 0.315X to the 10 times expansion of maximum magnification 3.15X, high resolution, high optical axis stability and high low temperature need not the continuous zoom imaging performance of refocusing, and the system can reach the high magnification simultaneously and zoom, can all keep good resolution performance at whole zoom in-process.
The following describes the optical imaging system of the present invention in detail by using 7 embodiments in conjunction with the accompanying drawings and tables. In each of the following embodiments, the utility model discloses record diaphragm STO into one side, record OBJECT plane OBJECT into one side, record IMAGE plane IMAGE into one side, record the plywood group that constitutes by two pieces of lens veneer into trilateral, record the plywood group that constitutes by three pieces of lens veneer into the four sides.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
TABLE 1
Example 1
Referring to fig. 1A and 1B, the parameters of the optical imaging system of the present embodiment are as follows:
conjugate data of object image: 300 mm; low power NA 0.047; high power NA 0.0928. The cemented lens group of the first lens group G1 is composed of a second lens L2 cemented with a third lens L3, and the cemented lens group of the fifth lens group G5 is composed of an eleventh lens L11 cemented with a twelfth lens L12. The fourth lens L4 is a convex lens.
Relevant parameters of each lens of the optical imaging system of the present embodiment include a surface Type (Type), a Radius of curvature (Radius), a Thickness (Thickness), a refractive index nd, and an abbe number vd, as shown in table 2 below.
TABLE 2
Referring to fig. 1A to 1F, in combination with the above tables 1 and 2, in the present embodiment, the refractive index and abbe number of the third lens L3 are: nd (neodymium) L3 ＝1.50；Vd L3 81.6. The refractive index and abbe number of the tenth lens L10 are: nd (neodymium) L10 ＝1.52；Vd L10 64.2. The refractive index and abbe number of the eleventh lens L11 are: nd (neodymium) L11 ＝1.50；Vd L11 ＝81.6。
The optical imaging system of the embodiment has the advantages of low distortion, high telecentricity, 10-time expansion from the minimum magnification of 0.315X to the maximum magnification of 3.15X, high resolution, high optical axis stability and continuous zoom imaging performance without refocusing at high and low temperatures, and meanwhile, the system can achieve large-magnification zooming and can keep good resolution performance in the whole zoom process.
Example 2
Referring to fig. 2A and 2B, the parameters of the optical imaging system of the present embodiment are as follows:
conjugate data of object image: 269.7 mm; low power NA 0.044; high NA ═ 0.093. The cemented lens group of the first lens group G1 is composed of a second lens L2 cemented with a third lens L3, and the cemented lens group of the fifth lens group G5 is composed of a tenth lens L10 cemented with an eleventh lens L11. The fourth lens L4 is a convex lens.
Relevant parameters of each lens of the optical imaging system of the present embodiment include a surface Type (Type), a Radius of curvature (Radius), a Thickness (Thickness), a refractive index nd, and an abbe number vd, as shown in table 3 below.
TABLE 3
Referring to fig. 2A to 2F, in combination with the above tables 1 and 3, in the present embodiment, the refractive index and abbe number of the third lens L3 are: nd (neodymium) L3 ＝1.50；Vd L3 81.6. The refractive index and abbe number of the tenth lens L10 are: nd (neodymium) L10 ＝1.59；Vd L10 ＝68.6。
The optical imaging system of the embodiment has the advantages of low distortion, high telecentricity, 10-time expansion from the minimum magnification of 0.315X to the maximum magnification of 3.15X, high resolution, high optical axis stability and continuous zoom imaging performance without refocusing at high and low temperatures, and meanwhile, the system can achieve large-magnification zooming and can keep good resolution performance in the whole zoom process.
Example 3
Referring to fig. 3A and 3B, the parameters of the optical imaging system of the present embodiment are as follows:
object image conjugation data: 300.3 mm; low power NA 0.03; high NA 0.09. The cemented lens group of the first lens group G1 is composed of a first lens L1, a second lens L2 and a third lens L3 cemented together, and the cemented lens group of the fifth lens group G5 is composed of a tenth lens L10, an eleventh lens L11 and a twelfth lens L12 cemented together. The fourth lens L4 is a convex lens.
Relevant parameters of each lens of the optical imaging system of the present embodiment include a surface Type (Type), a Radius of curvature (Radius), a Thickness (Thickness), a refractive index nd, and an abbe number vd, as shown in table 4 below.
TABLE 4
Referring to fig. 3A to 3F, in combination with the above tables 1 and 4, in the present embodiment, the refractive index and abbe number of the second lens L2 are: nd (neodymium) L2 ＝1.62；Vd L2 63.9. The refractive index and abbe number of the tenth lens L10 are: nd (neodymium) L10 ＝1.59；Vd L10 ＝68.6。
The optical imaging system of the embodiment has the advantages of low distortion, high telecentricity, 10-time expansion from the minimum magnification of 0.315X to the maximum magnification of 3.15X, high resolution, high optical axis stability and continuous zoom imaging performance without refocusing at high and low temperatures, and meanwhile, the system can achieve large-magnification zooming and can keep good resolution performance in the whole zoom process.
Example 4
Referring to fig. 4A and 4B, the parameters of the optical imaging system of the present embodiment are as follows:
conjugate data of object image: 299 mm; low power NA 0.03; high NA 0.09. The cemented lens group of the first lens group G1 is composed of a first lens L1, a second lens L2 and a third lens L3 cemented together, and the cemented lens group of the fifth lens group G5 is composed of an eleventh lens L11 and a twelfth lens L12 cemented together. The fourth lens L4 is a convex-concave lens.
Relevant parameters of each lens of the optical imaging system of the present embodiment include a surface Type (Type), a Radius of curvature (Radius), a Thickness (Thickness), a refractive index nd, and an abbe number vd, as shown in table 5 below.
TABLE 5
Referring to fig. 4A to 4F, in combination with the above tables 1 and 5, in the present embodiment, the refractive index and abbe number of the second lens L2 are: nd (neodymium) L2 ＝1.50；Vd L2 81.6. The refractive index and abbe number of the eleventh lens L11 are: nd (neodymium) L11 ＝1.50；Vd L11 ＝81.6。
The optical imaging system of the embodiment has the advantages of low distortion, high telecentricity, 10-time expansion from the minimum magnification of 0.315X to the maximum magnification of 3.15X, high resolution, high optical axis stability and continuous zoom imaging performance without refocusing at high and low temperatures, and meanwhile, the system can achieve large-magnification zooming and can keep good resolution performance in the whole zoom process.
Example 5
Referring to fig. 5A and 5B, the parameters of the optical imaging system of the present embodiment are as follows:
conjugate data of object image: 301 mm; low power NA 0.021; high NA 0.0735. The cemented lens group of the first lens group G1 is composed of a second lens L2 cemented with a third lens L3, and the cemented lens group of the fifth lens group G5 is composed of a tenth lens L10 cemented with an eleventh lens L11 cemented with a twelfth lens L12. The fourth lens L4 is a convex lens.
Relevant parameters of each lens of the optical imaging system of the present embodiment include a surface Type (Type), a Radius of curvature (Radius), a Thickness (Thickness), a refractive index nd, and an abbe number vd, as shown in table 6 below.
| Surface | Type | Radius | Thickness | nd | vd | |
| sur1 | standard | Infinity | 110.08(110) | |||
| sur2 | standard | 50.71 | 1.93 | 1.50 | 81.6 | |
| sur3 | standard | 414.75 | 0.4 | |||
| sur4 | standard | 54.21 | 3.83 | 1.81 | 25.5 | |
| sur5 | standard | 24.0 | 2.55 | 1.49 | 70.4 | |
| sur6 | standard | 347.22 | 29.85(29.93) | |||
| sur7 | standard | 124.55 | 2 | 1.83 | 37.2 | |
| sur8 | standard | -124.55 | 2.6(41.41) | |||
| sur9 | standard | 74.49 | 5.74 | 1.85 | 23.8 | |
| sur10 | standard | -13.86 | 4 | 1.85 | 32.3 | |
| sur11 | standard | 21.04 | 29.19(4.1) | |||
| STO | standard | Infinity | 6.89 | |||
| sur13 | standard | -14.41 | 1 | 1.62 | 36.3 | |
| sur14 | standard | 14.41 | 1.46 | 1.92 | 20.9 | |
| sur15 | standard | 34.78 | 16.22(2.5) | |||
| sur16 | standard | 220.01 | 2.29 | 1.92 | 20.9 | |
| sur17 | standard | -28.63 | 0.1 | |||
| sur18 | standard | 40.47 | 6.32 | 1.59 | 68.6 | |
| sur19 | standard | -21.58 | 1 | 1.85 | 23.8 | |
| Sur20 | standard | 21.58 | 2.97 | 1.75 | 52.3 | |
| Sur21 | standard | -157.03 | 12.52 | |||
| sur22 | standard | Infinity | 1.65 | 1.52 | 64.2 | |
| sur23 | standard | Infinity | 56.71 | |||
| | standard | 0 |
TABLE 6
Referring to fig. 5A to 5B, in combination with the above tables 1 and 6, in the present embodiment, the refractive index and abbe number of the first lens L1 are: nd (neodymium) L1 ＝1.50；Vd L1 81.6. The refractive index and abbe number of the third lens L3 are: nd (neodymium) L3 ＝1.49；Vd L3 70.4. The refractive index and abbe number of the tenth lens L10 are: nd (neodymium) L10 ＝1.59；Vd L10 ＝68.6。
The optical imaging system of the embodiment has the advantages of low distortion, high telecentricity, 10-time expansion from the minimum magnification of 0.315X to the maximum magnification of 3.15X, high resolution, high optical axis stability and continuous zoom imaging performance without refocusing at high and low temperatures, and meanwhile, the system can achieve large-magnification zooming and can keep good resolution performance in the whole zoom process.
Example 6
Referring to fig. 6A and 6B, the parameters of the optical imaging system of the present embodiment are as follows:
conjugate data of object image: 301.3 mm; low power NA 0.0214; high power NA 0.0733. The cemented lens group of the first lens group G1 is composed of a first lens L1, a second lens L2 and a third lens L3 cemented together, and the cemented lens group of the fifth lens group G5 is composed of a tenth lens L10, an eleventh lens L11 and a twelfth lens L12 cemented together. The fourth lens L4 is a convex-concave lens.
Relevant parameters of each lens of the optical imaging system of the present embodiment include a surface Type (Type), a Radius of curvature (Radius), a Thickness (Thickness), a refractive index nd, and an abbe number vd, as shown in table 7 below.
TABLE 7
Referring to fig. 6A to 6F, in combination with table 1 and table 7 described above, in the present embodiment, the refractive index and abbe number of the third lens L3 are: nd (neodymium) L3 ＝1.50；Vd L3 81.6. The refractive index and abbe number of the tenth lens L10 are: nd (neodymium) L10 ＝1.59；Vd L10 ＝68.6。
The optical imaging system of the embodiment has the advantages of low distortion, high telecentricity, 10-time expansion from the minimum magnification of 0.315X to the maximum magnification of 3.15X, high resolution, high optical axis stability and continuous zoom imaging performance without refocusing at high and low temperatures, and meanwhile, the system can achieve large-magnification zooming and can keep good resolution performance in the whole zoom process.
Example 7
Referring to fig. 7A and 7B, the parameters of the optical imaging system of the present embodiment are as follows:
conjugate data of object image: 334.56 mm; low power NA 0.0245; high power NA 0.0715. The cemented lens group of the first lens group G1 is composed of a second lens L2 cemented with a third lens L3, and the cemented lens group of the fifth lens group G5 is composed of a tenth lens L10 cemented with an eleventh lens L11 cemented with a twelfth lens L12. The fourth lens L4 is a convex lens.
Relevant parameters of each lens of the optical imaging system of the present embodiment include a surface Type (Type), a Radius of curvature (Radius), a Thickness (Thickness), a refractive index nd, and an abbe number vd, as shown in table 8 below.
| Surface | Type | Radius | Thickness | nd | vd | |
| sur1 | standard | Infinity | 122.35(121.35) | |||
| sur2 | standard | 235.51 | 2.12 | 1.60 | 38.0 | |
| sur3 | standard | -60.17 | 0.1 | |||
| sur4 | standard | 49.84 | 4.57 | 1.50 | 81.6 | |
| sur5 | standard | -54.86 | 1 | 1.81 | 25.5 | |
| sur6 | standard | 84.42 | 36.85(37.85) | |||
| Sur7 | standard | 72.06 | 1.66 | 1.83 | 37.2 | |
| sur8 | standard | -375.75 | 2.6(38.06) | |||
| sur9 | standard | 74.49 | 5.74 | 1.85 | 23.8 | |
| sur10 | standard | -13.86 | 4 | 1.85 | 32.3 | |
| sur11 | standard | 21.04 | 26.35(2.63) | |||
| sur12 | standard | Infinity | 18.71 | |||
| STO | standard | -14.41 | 1 | 1.62 | 36.3 | |
| sur14 | standard | 14.41 | 1.46 | 1.92 | 20.9 | |
| sur15 | standard | 34.78 | 14.24(2.5) | |||
| sur16 | standard | 272.76 | 2.7 | 1.92 | 20.9 | |
| sur17 | standard | -27.82 | 0.1 | |||
| sur18 | standard | 40.47 | 6.32 | 1.59 | 68.6 | |
| sur19 | standard | -21.58 | 1 | 1.85 | 23.8 | |
| Sur20 | standard | 21.58 | 2.97 | 1.75 | 52.3 | |
| Sur21 | standard | -157.03 | 16.74 | |||
| sur22 | standard | Infinity | 1.65 | 1.52 | 64.2 | |
| sur23 | standard | Infinity | 60.32 | |||
| | Infinity | 0 |
TABLE 8
Referring to fig. 7A to 7B, in combination with the above tables 1 and 8, in the present embodiment, the refractive index and abbe number of the second lens L2 are: nd (neodymium) L2 ＝1.50；Vd L2 81.6. The refractive index and abbe number of the tenth lens L10 are: nd (neodymium) L10 ＝1.59；Vd L10 ＝68.6。
The optical imaging system of the embodiment has the advantages of low distortion, high telecentricity, 10-time expansion from the minimum magnification of 0.315X to the maximum magnification of 3.15X, high resolution, high optical axis stability and continuous zoom imaging performance without refocusing at high and low temperatures, and meanwhile, the system can achieve large-magnification zooming and can keep good resolution performance in the whole zoom process.
Example 8
Referring to fig. 8A and 8B, the parameters of the optical imaging system of the present embodiment are as follows:
conjugate data of object image: 301.9 mm; low power NA 0.014; high NA is 0.07. The cemented lens group of the first lens group G1 is composed of a first lens L1 cemented with a second lens L2, and the cemented lens group of the fifth lens group G5 is composed of a tenth lens L10 cemented with an eleventh lens L11 cemented with a twelfth lens L12. The fourth lens L4 is a convex lens.
Relevant parameters of each lens of the optical imaging system of the present embodiment include a surface Type (Type), a Radius of curvature (Radius), a Thickness (Thickness), a refractive index nd, and an abbe number vd, as shown in table 9 below.
TABLE 9
Referring to fig. 8A to 8F, in combination with table 1 and table 9 described above, in the present embodiment, the refractive index and abbe number of the second lens L2 are: nd (neodymium) L2 ＝1.50；Vd L2 81.6. The refractive index and abbe number of the tenth lens L10 are: nd (neodymium) L10 ＝1.59；Vd L10 68.6. The refractive index and abbe number of the twelfth lens L12 are: nd (neodymium) L12 ＝1.52；Vd L12 ＝64.2。
The optical imaging system of the embodiment has the advantages of low distortion, high telecentricity, 10-time expansion from the minimum magnification of 0.315X to the maximum magnification of 3.15X, high resolution, high optical axis stability and continuous zoom imaging performance without refocusing at high and low temperatures, and meanwhile, the system can achieve large-magnification zooming and can keep good resolution performance in the whole zoom process.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (17)
1. An optical imaging system comprising: a first lens group (G1) having positive refractive power, a second lens group (G2) having positive refractive power, a third lens group (G3) having negative refractive power, a fourth lens group (G4) and a fifth lens group (G5) having positive refractive power, which are arranged in this order from the object side to the image side along the optical axis, wherein an aperture Stop (STO) is provided between the third lens group (G3) and the fourth lens group (G4), the fourth lens group (G4) has negative refractive power, and the first lens group (G1) includes at least one lens having positive refractive power and one lens having negative refractive power,
in the zooming process, the second lens group (G2) and the fifth lens group (G5) are fixedly arranged, the third lens group (G3) and the fourth lens group (G4) move synchronously along an optical axis for realizing zooming, and the first lens group (G1) moves along the optical axis for realizing focusing.
2. The optical imaging system according to claim 1, characterized in that the third lens group (G3) and the fourth lens group (G4) are synchronously moved with a common drive.
3. The optical imaging system of claim 1, wherein along the optical axis in a direction from the object side to the image side,
the first lens group (G1) sequentially comprises a first lens (L1), a second lens (L2) and a third lens (L3), wherein two or three adjacent lenses of the first lens (L1), the second lens (L2) and the third lens (L3) are cemented to form a cemented lens group.
4. The optical imaging system of claim 1, wherein the second lens group (G2) comprises a fourth lens (L4) having positive optical power, the fourth lens (L4) being a convex-concave lens or a convex-convex lens.
5. The optical imaging system of claim 1, wherein along the optical axis in a direction from the object side to the image side,
the third lens group (G3) sequentially comprises a fifth lens (L5) with positive focal power and a sixth lens (L6) with negative focal power, and the fifth lens (L5) and the sixth lens (L6) are cemented to form a cemented lens group.
6. The optical imaging system of claim 1, wherein along the optical axis in a direction from the object side to the image side,
the fourth lens group (G4) comprises a seventh lens (L7) with negative focal power and an eighth lens (L8) with positive focal power in sequence, and the seventh lens (L7) and the eighth lens (L8) are cemented to form a cemented lens group.
7. The optical imaging system of claim 1, wherein, in a direction from an object side to an image side along an optical axis,
the fifth lens group (G5) comprises a ninth lens (L9), a tenth lens (L10), an eleventh lens (L11) and a twelfth lens (L12) in sequence, wherein three lenses have positive focal power, one lens has negative focal power, and two or three adjacent lenses of the ninth lens (L9), the tenth lens (L10), the eleventh lens (L11) and the twelfth lens (L12) are cemented to form a cemented lens group.
8. The optical imaging system according to claim 1, characterized in that a transflective beam splitting device (L) is arranged between the first lens group (G1) and the second lens group (G2), and a light source emitter is arranged above the transflective beam splitting device (L).
9. The optical imaging system of claim 8, wherein along the optical axis in a direction from the object side to the image side,
the first lens group (G1) sequentially comprises a first lens (L1), a second lens (L2) and a third lens (L3), wherein two or three adjacent lenses of the first lens (L1), the second lens (L2) and the third lens (L3) are cemented to form a cemented lens group.
10. The optical imaging system of claim 8, wherein the second lens group (G2) comprises a fourth lens (L4) having positive optical power, the fourth lens (L4) being a convex-concave lens or a convex-convex lens.
11. The optical imaging system of claim 8, wherein along the optical axis in a direction from the object side to the image side,
the third lens group (G3) comprises a fifth lens (L5) with positive power or negative power and a sixth lens (L6) with positive power or negative power in sequence, and the fifth lens (L5) and the sixth lens (L6) are cemented to form a cemented lens group.
12. The optical imaging system of claim 8, wherein along the optical axis in a direction from the object side to the image side,
the fourth lens group (G4) comprises a seventh lens (L7) with positive power or negative power and an eighth lens (L8) with positive power or negative power in sequence, and the seventh lens (L7) and the eighth lens (L8) are cemented to form a cemented lens group.
13. The optical imaging system of claim 8, wherein along the optical axis in a direction from the object side to the image side,
the fifth lens group (G5) comprises a ninth lens (L9), a tenth lens (L10), an eleventh lens (L11) and a twelfth lens (L12) in sequence, wherein at least two lenses have positive focal power, at least one lens has negative focal power, and two or three adjacent lenses of the ninth lens (L9), the tenth lens (L10), the eleventh lens (L11) and the twelfth lens (L12) are cemented to form a cemented lens group.
14. The optical imaging system according to any one of claims 1 to 13, wherein the distance d between the last face of the third lens group (G3) and the center of the first face of the fourth lens group (G4) is smaller than the distance d between the last face of the third lens group (G3) and the center of the first face of the fourth lens group (G4) 34t And the center distance d between the last surface of the third lens group (G3) and the first surface of the fourth lens group (G4) when the optical imaging system is at high magnification 34w And a focal length f of the third lens group (G3) 3 The following conditions are satisfied: less than or equal to 0.4 (d) 34t -d 34w )/f 3 |≤1.3。
15. The optical imaging system according to any one of claims 1 to 13, characterized in that the focal length f of the third lens group (G3) 3 And a focal length f of the fourth lens group (G4) 4 The following conditions are satisfied: f is more than or equal to 0.9 3 |/|f 4 |≤2。
16. The optical imaging system according to any one of claims 1 to 13, characterized in that the refractive index ND of at least one lens of positive power in the first lens group (G1) (Lk) And Abbe number VD (Lk) The following conditions are respectively satisfied: ND not less than 1.4 (Lk) ≤1.65；60≤VD (Lk) ≤95。
17. The optical imaging system according to any one of claims 1 to 13, characterized in that the refractive index ND of at least one lens of positive power in the fifth lens group (G5) (Lh) And Abbe number VD (Lh) The following conditions are respectively satisfied: ND of 1.4. ltoreq. (Lh) ≤1.65；60≤VD (Lh) ≤95。
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