High-precision industrial zoom lens

Abstract

The invention belongs to the technical field of optical lenses, and discloses a high-precision industrial zoom lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from an image plane to an object plane along an optical axis, the first lens, the fourth lens, the fifth lens and the eighth lens have negative focal lengths; the second lens, the third lens, the sixth lens, the seventh lens and the ninth lens have positive focal lengths; the first lens and the second lens are glued to form a first glued lens, the fifth lens and the sixth lens are glued to form a second glued lens, the seventh lens and the eighth lens are glued to form a third glued lens, and a diaphragm is arranged between the sixth lens and the seventh lens. According to the invention, the effects of large and small magnification change and no out-of-focus can be achieved; the image quality is clear, the imaging effect is ensured, and the imaging is obviously improved.

Description

Technical Field

[0001] This invention belongs to the field of optical lens technology, specifically relating to a high-precision industrial zoom lens. Background Technology

[0002] In industrial vision, many lenses are constantly being reformed and upgraded in response to the evolution of machine tools, while meeting the requirements of "high reliability, low cost, high precision and high-definition images", and working in various complex environments. This puts new demands on image capture and magnification during machine operation. Some equipment upgrades require network connection for real-time data acquisition, and there are extreme requirements for working distance and various scenarios. Traditional equipment such as two-dimensional imaging, electronic magnifying glasses, medical magnifying glasses and machine vision magnifying glasses are all facing new requirements.

[0003] As for industrial zoom lenses, most industrial lenses on the market currently suffer from insufficient sharpness or are not designed according to actual scenarios. When the magnification of an industrial lens is changed according to the actual situation, the sharpness will deteriorate.

[0004] Furthermore, traditional optical targets have small surfaces and large distortions, which cannot guarantee the required optical precision. They also increase the size considerably, resulting in higher costs. Summary of the Invention

[0005] The purpose of this invention is to provide a high-precision industrial zoom lens to solve at least one of the aforementioned problems in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A high-precision industrial zoom lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged sequentially along the optical axis from the image plane to the object plane. The first lens, the fourth lens, the fifth lens, and the eighth lens have negative focal lengths, while the second lens, the third lens, the sixth lens, the seventh lens, and the ninth lens have positive focal lengths. The first lens and the second lens are cemented together to form a first cemented lens, the fifth lens and the sixth lens are cemented together to form a second cemented lens, and the seventh lens and the eighth lens are cemented together to form a third cemented lens. An aperture stop is provided between the sixth lens and the seventh lens.

[0007] As a preferred technical solution of the present invention, the first lens, the fourth lens and the eighth lens are all made of low dispersion material; the first lens, the second lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all made of glass, and the second lens, the fifth lens and the seventh lens are all made of high refractive index material.

[0008] In a preferred embodiment of the present invention, the side of the first lens facing the image plane is surface one; the sides of the first and second lenses facing each other are surface two; the side of the second lens facing the object plane is surface three; the side of the third lens facing the image plane is surface four; the side of the third lens facing the object plane is surface five; the side of the fourth lens facing the image plane is surface six; the side of the fourth lens facing the object plane is surface seven; the side of the fifth lens facing the image plane is surface eight; the sides of the fifth and sixth lenses facing each other are surface nine; the side of the sixth lens facing the object plane is surface ten; the aperture surface of the aperture is surface eleven; the side of the seventh lens facing the image plane is surface twelve; the sides of the seventh and eighth lenses facing each other are surface thirteen; the side of the eighth lens facing the object plane is surface fourteen; the side of the ninth lens facing the image plane is surface fifteen; and the side of the ninth lens facing the object plane is surface sixteen. Surfaces one, two, three, four, five, six, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, and sixteen are all spherical surfaces, and surface seven is a plane.

[0009] In a preferred embodiment of the present invention, the radius of curvature of surface one is 124.31 mm to 128.22 mm, the radius of curvature of surface two is -35.52 mm to -33.55 mm, the radius of curvature of surface three is -79.25 mm to -76.52 mm, the radius of curvature of surface four is 978.32 mm to 981.25 mm, the radius of curvature of surface five is -105.23 mm to -102.98 mm, the radius of curvature of surface six is ​​60.01 mm to 620.03 mm, and the radius of curvature of surface eight is -13.95 mm. The radius of curvature of face nine is -6.39mm to -6.1mm, that of face ten is 18.81mm to 19.92mm, that of face eleven is -17.33mm to 15.48mm, that of face twelve is 8.02mm to 9.35mm, that of face thirteen is -25.23mm to -23.92mm, that of face fourteen is -32.96mm to -30.55mm, and that of face sixteen is 6670.25mm to 6671.35mm.

[0010] As a preferred technical solution of the present invention, the refractive index of facet 1 is 1.555~1.652, the refractive index of facet 2 is 1.784~1.912, the refractive index of facet 4 is 1.553~1.631, the refractive index of facet 6 is 1.593~1.7124, the refractive index of facet 8 is 1.858~2.035, the refractive index of facet 9 is 1.758~1.835, the refractive index of facet 11 is 1.729~1.935, the refractive index of facet 12 is 1.596~1.721, and the refractive index of facet 14 is 1.5621~1.735.

[0011] As a preferred embodiment of the present invention, the dispersion coefficient of surface one is 59.652 ps / (nm·km) to 61.614 ps / (nm·km), the dispersion coefficient of surface two is 24.416 ps / (nm·km) to 26.584 ps / (nm·km), the dispersion coefficient of surface four is 55.365 ps / (nm·km) to 57.254 ps / (nm·km), the dispersion coefficient of surface six is ​​58.233 ps / (nm·km) to 61.124 ps / (nm·km), and the dispersion coefficient of surface eight is 19.78 ps / (nm·km). The dispersion coefficients of facet 9 are 39.785 ps / (nm.km) to 42.032 ps / (nm.km), facet 11 are 32.654 ps / (nm.km) to 34.55 ps / (nm.km), facet 12 are 60.596 ps / (nm.km) to 62.721 ps / (nm.km), and facet 14 are 55.596 ps / (nm.km) to 57.721 ps / (nm.km).

[0012] As a preferred technical solution of the present invention, the working wavelength of the high-precision industrial zoom lens is 400nm-700nm.

[0013] As a preferred technical solution of the present invention, the high-precision industrial zoom lens has a focal length between 68mm and 75mm, an aperture between 10 and 13, a target surface size between 1 / 2.5 and 2 / 3 inches, and a total optical length between 160mm and 180mm.

[0014] As a preferred technical solution of the present invention, the first cemented lens, the second lens, the third lens, the fourth lens, the second cemented lens, the third cemented lens, and the ninth lens are all installed inside the lens barrel, and the second cemented lens and the ninth lens are both slidably installed inside the lens barrel along the length direction of the lens barrel.

[0015] In a preferred embodiment of the present invention, the second cemented lens is installed inside the first metal sleeve, which is fitted inside the lens barrel. A first limiting member is fixed to one side of the first metal sleeve, and a first sliding groove extending along its length is formed on the inner wall of the lens barrel on one side of the first metal sleeve. The first limiting member slides within the first sliding groove. The ninth lens is installed inside the second metal sleeve, which is fitted inside the lens barrel. A second limiting member is fixed to one side of the second metal sleeve, and a second sliding groove extending along its length is formed on the inner wall of the lens barrel on one side of the second metal sleeve. The second limiting member slides within the second sliding groove.

[0016] Beneficial effects: This invention uses a curved groove in the structure to drive the first and second lenses to cement together, achieving focusing. In practical use, magnification changes can be achieved through synchronous movement. The axial movement of the second and third cemented lenses in the lens barrel can achieve imaging from 0.2 to 1.4x while simultaneously focusing, resulting in high-definition, high-magnification image quality. Ultimately, it achieves both magnification changes and focus stability. By combining multiple individual lenses and cemented lenses, clear image quality can be achieved simply by lengthening the air gap between the lenses. The first, second, and third cemented lenses all use a combination of positive and negative lenses, ensuring image quality and providing a high degree of balance against spherical aberration, coma, on-axis chromatic aberration, and transverse chromatic aberration. The combination of one negative and one positive lens significantly improves image quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the high-precision industrial zoom lens of the present invention; Figure 2 This is the MTF curve of the high-precision industrial zoom lens of the present invention. Figure 3 This is a focusing curve diagram of the high-precision industrial zoom lens of the present invention; Figure 4 This is a dot diagram of the high-precision industrial zoom lens of the present invention; Figure 5 This is a relative illumination diagram of the high-precision industrial zoom lens of the present invention; Figure 6 This is a chromatic aberration diagram of the high-precision industrial zoom lens of the present invention. Figure 7 This is a partial structural diagram of the high-precision industrial zoom lens of the present invention installed inside the lens barrel.

[0018] In the diagram: 1-First lens; 2-Second lens; 3-Third lens; 4-Fourth lens; 5-Fifth lens; 6-Sixth lens; 7-Seventh lens; 8-Eighth lens; 9-Ninth lens; 10-Lens barrel; 1001-First groove; 1002-Second groove; 11-First metal sleeve; 12-First limiting member; 13-Second metal sleeve; 14-Second limiting member; S1-Surface 1; S2-Surface 2; S3-Surface 3; S4-Surface 4; S5-Surface 5; S6-Surface 6; S7-Surface 7; S8-Surface 8; S9-Surface 9; S10-Surface 10; S11-Surface 11; S12-Surface 12; S13-Surface 13; S14-Surface 14; S15-Surface 15; S16-Surface 16. Detailed Implementation

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0020] Example 1: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, this embodiment provides a high-precision industrial zoom lens, including a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, and a ninth lens 9 arranged sequentially along the optical axis from the image plane to the object plane. The first lens 1, fourth lens 4, fifth lens 5, and eighth lens 8 have negative focal lengths, while the second lens 2, third lens 3, sixth lens 6, seventh lens 7, and ninth lens 9 have positive focal lengths, such that the focal lengths of all lenses are negative, positive, positive, negative, negative, positive, positive, negative, positive, positive, negative, positive; the first lens 1 and the second... Lens 2 is cemented together to form a first cemented lens, lens 5 and lens 6 are cemented together to form a second cemented lens, and lens 7 and lens 8 are cemented together to form a third cemented lens. An aperture is provided between lens 6 and lens 7. The first lens 1 and the second lens 2 are cemented together by means of a curved groove in the structure to achieve focusing. In practice, the magnification can be changed by means of synchronous movement. The movement of the second and third cemented lenses along the axis of the lens barrel can achieve imaging from 0.2 to 1.4 times, while simultaneously achieving focusing, thus achieving high-definition, high-magnification image quality.

[0021] This invention utilizes a curved groove design to drive the first lens 1 and the second lens 2 to cement together, achieving focusing. In practical use, magnification changes can be achieved through synchronous movement. The axial movement of the second and third cemented lenses along the lens barrel allows for imaging at magnifications of 0.2 to 1.4, while simultaneously focusing, resulting in high-definition, high-magnification image quality. Ultimately, it achieves both magnification changes and focus stability. By combining multiple individual lenses and cemented lenses, simply lengthening the air gap between the lenses is sufficient to achieve clear image quality. The first, second, and third cemented lenses all employ a combination of positive and negative lenses, ensuring image quality and providing excellent balance against spherical aberration, coma, on-axis chromatic aberration, and transverse chromatic aberration. This combination of positive and negative lenses significantly improves image quality.

[0022] As a preferred embodiment of this invention, it should be further noted that the first lens 1, the fourth lens 4, and the eighth lens 8 are all made of low dispersion materials, which significantly improves imaging performance. At the same time, the first lens 1, the second lens 2, the fifth lens 5, the sixth lens 6, the seventh lens 7, and the eighth lens 8 are all made of glass, and the second lens 2, the fifth lens 5, and the seventh lens 7 are all made of high refractive index materials. Combined with the characteristics of cemented lenses, this achieves high image quality, high assembly precision, and a high-precision background color function.

[0023] As a preferred embodiment of this example, it should be further explained that: the side of the first lens 1 facing the image plane is surface one (S1); the sides of the first lens 1 and the second lens 2 facing each other are surface two (S2); the side of the second lens 2 facing the object plane is surface three (S3); the side of the third lens 3 facing the image plane is surface four (S4); the side of the third lens 3 facing the object plane is surface five (S5); the side of the fourth lens 4 facing the image plane is surface six (S6); the side of the fourth lens 4 facing the object plane is surface seven (S7); the side of the fifth lens 5 facing the image plane is surface eight (S8); the sides of the fifth lens 5 and the sixth lens 6 facing each other are surface nine (S9); the side of the sixth lens 6 facing the object plane is surface ten (S10); and the aperture plane of the aperture is... Surface 11 (S11), the side of the seventh lens 7 facing the image plane (S12), the side of the seventh lens 7 and the eighth lens 8 facing each other (S13), the side of the eighth lens 8 facing the object plane (S14), the side of the ninth lens 9 facing the image plane (S15), and the side of the ninth lens 9 facing the object plane (S16) are for easy introduction of each lens and cemented lens. Among them, surface 1 (S1), surface 2 (S2), surface 3 (S3), surface 4 (S4), surface 5 (S5), surface 6 (S6), surface 8 (S8), surface 9 (S9), surface 10 (S10), surface 11 (S11), surface 12 (S12), surface 13 (S13), surface 14 (S14), surface 15 (S15), and surface 16 (S16) are all spherical, and surface 7 (S7) is a plane.

[0024] Meanwhile, the radius of curvature parameter is as follows: The radius of curvature of surface S1 is 124.31mm~128.22mm, the radius of curvature of surface S2 is -35.52mm~-33.55mm, the radius of curvature of surface S3 is -79.25mm~-76.52mm, the radius of curvature of surface S4 is 978.32mm~981.25mm, the radius of curvature of surface S5 is -105.23mm~-102.98mm, the radius of curvature of surface S6 is 60.01mm~620.03mm, and the radius of curvature of surface S8 is -13.95mm~-12.88mm. The radius of curvature of surface S9 is -6.39mm to -6.1mm, the radius of curvature of surface S10 is 18.81mm to 19.92mm, the radius of curvature of surface S11 is -17.33mm to 15.48mm, the radius of curvature of surface S12 is 8.02mm to 9.35mm, the radius of curvature of surface S13 is -25.23mm to -23.92mm, the radius of curvature of surface S14 is -32.96mm to -30.55mm, and the radius of curvature of surface S16 is 6670.25mm to 6671.35mm.

[0025] The refractive index parameters are as follows: The refractive indices of the following facets are as follows: S1 (1.555~1.652), S2 (1.784~1.912), S4 (1.553~1.631), S6 (1.593~1.7124), S8 (1.858~2.035), S9 (1.758~1.835), S11 (1.729~1.935), S12 (1.596~1.721), and S14 (1.5621~1.735).

[0026] The dispersion coefficient parameters are as follows: The dispersion coefficients of surface S1 are 59.652 ps / (nm·km) to 61.614 ps / (nm·km), surface S2 is 24.416 ps / (nm·km) to 26.584 ps / (nm·km), surface S4 is 55.365 ps / (nm·km) to 57.254 ps / (nm·km), surface S6 is 58.233 ps / (nm·km) to 61.124 ps / (nm·km), and surface S8 is 19.785 ps / (nm·km). The dispersion coefficients of facet 9 (S9) are 39.785 ps / (nm·km) to 42.032 ps / (nm·km), facet 11 (S11) is 32.654 ps / (nm·km) to 34.55 ps / (nm·km), facet 12 (S12) is 60.596 ps / (nm·km) to 62.721 ps / (nm·km), and facet 14 (S14) is 55.596 ps / (nm·km) to 57.721 ps / (nm·km).

[0027] The relevant parameters of the final imaging system are as follows: Table 1: Relevant parameters of the imaging system

[0028] By combining multiple individual lenses and cemented lenses, clear image quality can be achieved simply by lengthening the air gap between the lenses. At the same time, the use of low-refractive-index, low-dispersion glass to mutually achromaticize and improve image quality, and the combination of positive and negative cemented lenses ensures imaging effect and plays a very high role in balancing spherical aberration, coma, on-axis chromatic aberration, and transverse chromatic aberration. The combination of one negative and one positive lens has a significant improvement in image quality.

[0029] As a preferred embodiment of this example, it should be further explained that, in order to achieve cost reduction, the high-precision industrial zoom lens operates in the 400nm-700nm band, which can reduce costs. At the same time, it has low distortion at small angles, so there will be vignetting in the design. Then, in the actual structure, the cutting stage method is considered to improve the flatness of the lens, which can further improve the image quality.

[0030] As a preferred embodiment of this invention, it should be further explained that the high-precision industrial zoom lens has a focal length between 68mm and 75mm, an aperture between 10 and 13, a target surface size between 1 / 2.5 and 2 / 3 inches, and a total optical length between 160mm and 180mm, ensuring high resolution. In practice, it adopts a temperature compensation design, allowing it to operate without defocusing in environments ranging from -40℃ to +80℃. The mutual compensation of optical power between positive and negative lenses not only ensures the performance of the optical system but also reduces component processing costs, simplifies the structure, reduces weight, and facilitates mass production, meeting market demands. Furthermore, the use of low-dispersion materials also improves image quality.

[0031] Combination Figures 2-6 The diagram shown illustrates the various data points of the high-precision industrial zoom lens of this invention in the 400nm-700nm working wavelength band. Figure 2 and Figure 3 As can be seen, the high-precision industrial zoom lens of this invention has good focusing performance, can guarantee high resolution, and has good image quality. Among other things, Figure 5 The horizontal axis represents the field of view in degrees, and the vertical axis represents the relative illumination. From Figure 4 As can be seen from the data, the relative illumination of this embodiment reaches more than 80%, which is good relative illumination. Figure 6 This displays the lens's color reproduction accuracy.

[0032] Example 2: This embodiment is a further evolution based on Embodiment 1. It should be noted in this embodiment that, as... Figure 7As shown, the first cemented lens, the second lens 2, the third lens 3, the fourth lens 4, the second cemented lens, the third cemented lens, and the ninth lens 9 are all installed inside the lens barrel 10. The second cemented lens and the ninth lens 9 are both slidably installed inside the lens barrel 10 along its length. Specifically, the second cemented lens is installed inside the first metal sleeve 11, which is fitted into the lens barrel 10. A first limiting member 12 is fixed to one side of the first metal sleeve 11. A first sliding groove 1001 extending along the length of the first metal sleeve 11 is formed on the inner wall of the lens barrel 10 on one side of the first metal sleeve 11. The first limiting member 12 matches the sliding groove. The lens moves within the first groove 1001, thereby controlling the movement of the second cemented lens along the axial direction of the lens barrel 10; the ninth lens 9 is installed within the second metal sleeve 13, which is fitted into the lens barrel 10. A second limiting member 14 is fixed on one side of the second metal sleeve 13, and a second groove 1002 extending along its length is provided on the inner wall of the lens barrel 10 on one side of the second metal sleeve 13. The second limiting member 14 slides within the second groove 1002, thereby controlling the movement of the ninth lens 9 along the axial direction of the lens barrel 10, ultimately achieving adjustment of the relative distance between some lenses and cemented lenses, and realizing magnification adjustment and focus control, etc.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-precision industrial zoom lens characterized by comprising: The lens comprises first lens (1), second lens (2), third lens (3), fourth lens (4), fifth lens (5), sixth lens (6), seventh lens (7), eighth lens (8) and ninth lens (9) arranged in order from image plane to object plane along optical axis, the first lens (1), fourth lens (4), fifth lens (5) and eighth lens (8) have negative focal length, and the second lens (2), third lens (3), sixth lens (6), seventh lens (7) and ninth lens (9) have positive focal length; the first lens (1) and the second lens (2) are cemented to form a first cemented lens, the fifth lens (5) and the sixth lens (6) are cemented to form a second cemented lens, the seventh lens (7) and the eighth lens (8) are cemented to form a third cemented lens, and a diaphragm is arranged between the sixth lens (6) and the seventh lens (7).

2. The high-precision industrial zoom lens according to claim 1, wherein The first lens (1), fourth lens (4) and eighth lens (8) are made of low dispersion material; the first lens (1), second lens (2), fifth lens (5), sixth lens (6), seventh lens (7) and eighth lens (8) are made of glass material, and the second lens (2), fifth lens (5) and seventh lens (7) are made of high refractive index material.

3. The high-precision industrial zoom lens according to claim 1 or 2, characterized in that, The first lens (1) has a surface one (S1) facing the image plane, the first lens (1) and the second lens (2) have a surface two (S2) facing each other, the second lens (2) has a surface three (S3) facing the object plane, the third lens (3) has a surface four (S4) facing the image plane, the third lens (3) has a surface five (S5) facing the object plane, the fourth lens (4) has a surface six (S6) facing the image plane, the fourth lens (4) has a surface seven (S7) facing the object plane, the fifth lens (5) has a surface eight (S8) facing the image plane, the fifth lens (5) and the sixth lens (6) have a surface nine (S9) facing each other, the sixth lens (6) has a surface ten (S10) facing the object plane, the diaphragm has a diaphragm surface (S11), the seventh lens (7) has a surface twelve (S12) facing the image plane, the seventh lens (7) and the eighth lens (8) have a surface thirteen (S13) facing each other, the eighth lens (8) has a surface fourteen (S14) facing the object plane, the ninth lens (9) has a surface fifteen (S15) facing the image plane, the ninth lens (9) has a surface sixteen (S16) facing the object plane, the surface one (S1), surface two (S2), surface three (S3), surface four (S4), surface five (S5), surface six (S6), surface eight (S8), surface nine (S9), surface ten (S10), surface eleven (S11), surface twelve (S12), surface thirteen (S13), surface fourteen (S14), surface fifteen (S15) and surface sixteen (S16) are spherical surfaces, and the surface seven (S7) is a plane.

4. The high-precision industrial zoom lens according to claim 3, wherein The curvature radius of the first surface (S1) is 124.31mm~128.22mm, the curvature radius of the second surface (S2) is -35.52mm~-33.55mm, the curvature radius of the third surface (S3) is -79.25mm~-76.52mm, the curvature radius of the fourth surface (S4) is 978.32mm~981.25mm, the curvature radius of the fifth surface (S5) is -105.23mm~-102.98mm, the curvature radius of the sixth surface (S6) is 60.01mm~620.03mm, the curvature radius of the eighth surface (S8) is -13.95mm~-12.88mm, the curvature radius of the ninth surface (S9) is -6.39mm~-6.1mm, the curvature radius of the tenth surface (S10) is 18.81mm~19.92mm, the curvature radius of the eleventh surface (S11) is -17.33mm~15.48mm, the curvature radius of the twelfth surface (S12) is 8.02mm~9.35mm, the curvature radius of the thirteenth surface (S13) is -25.23mm~-23.92mm, the curvature radius of the fourteenth surface (S14) is -32.96mm~-30.55mm, the curvature radius of the sixteenth surface (S16) is 6670.25mm~6671.35mm.

5. The high-precision industrial zoom lens according to claim 3, wherein The refractive index of the first surface (S1) is 1.555~1.652, the refractive index of the second surface (S2) is 1.784~1.912, the refractive index of the fourth surface (S4) is 1.553~1.631, the refractive index of the sixth surface (S6) is 1.593~1.7124, the refractive index of the eighth surface (S8) is 1.858~2.035, the refractive index of the ninth surface (S9) is 1.758~1.835, the refractive index of the eleventh surface (S11) is 1.729~1.935, the refractive index of the twelfth surface (S12) is 1.596~1.721, the refractive index of the fourteenth surface (S14) is 1.5621~1.

735.

6. The high-precision industrial zoom lens according to claim 3, wherein The dispersion coefficient of the first surface (S1) is 59.652 ps / (nm.km)~61.614 ps / (nm.km), the dispersion coefficient of the second surface (S2) is 24.416 ps / (nm.km)~26.584 ps / (nm.km), the dispersion coefficient of the fourth surface (S4) is 55.365 ps / (nm.km)~57.254 ps / (nm.km), the dispersion coefficient of the sixth surface (S6) is 58.233 ps / (nm.km)~61.124 ps / (nm.km), the dispersion coefficient of the eighth surface (S8) is 19.785 ps / (nm.km)~21.032 ps / (nm.km), the dispersion coefficient of the ninth surface (S9) is 39.785 ps / (nm.km)~42.032 ps / (nm.km), the dispersion coefficient of the eleventh surface (S11) is 32.654 ps / (nm.km)~34.55 ps / (nm.km), the dispersion coefficient of the twelfth surface (S12) is 60.596 ps / (nm.km)~62.721 ps / (nm.km), and the dispersion coefficient of the fourteenth surface (S14) is 55.596 ps / (nm.km)~57.721 ps / (nm.km).

7. The high-precision industrial zoom lens according to claim 1, wherein The working wave band of the high-precision industrial zoom lens is 400-700 nm.

8. The high-precision industrial zoom lens according to claim 1 or 7, characterized in that, The focal length of the high-precision industrial zoom lens is between 68 mm and 75 mm, the aperture is between 10 and 13, the target surface size is between 1 / 2.5 and 2 / 3 inch, and the total optical length is between 160 mm and 180 mm.

9. The high-precision industrial zoom lens according to claim 1, wherein The first cemented lens, the second lens (2), the third lens (3), the fourth lens (4), the second cemented lens, the third cemented lens and the ninth lens (9) are all installed in the lens barrel (10), and the second cemented lens and the ninth lens (9) are both slidingly installed in the lens barrel (10) in a position-adjustable manner along the length direction of the lens barrel (10).

10. The high-precision industrial zoom lens according to claim 9, wherein The second cemented lens is installed in the first metal sleeve (11), the first metal sleeve (11) is sleeved in the lens barrel (10), one side of the first metal sleeve (11) is fixed with a first limiting piece (12), and a first sliding groove (1001) extending along the length direction of the lens barrel (10) is formed in the inner wall of the lens barrel (10) on one side of the first metal sleeve (11), and the first limiting piece (12) is slidingly matched in the first sliding groove (1001); the ninth lens (9) is installed in the second metal sleeve (13), the second metal sleeve (13) is sleeved in the lens barrel (10), one side of the second metal sleeve (13) is fixed with a second limiting piece (14), and a second sliding groove (1002) extending along the length direction of the lens barrel (10) is formed in the inner wall of the lens barrel (10) on one side of the second metal sleeve (13), and the second limiting piece (14) is slidingly matched in the second sliding groove (1002).

Images