A high-magnification industrial lens and camera device for machine vision

Abstract

The present invention provides a high-magnification industrial lens and a camera device for machine vision, wherein the lens comprises an optical system, specifically comprising a first lens group, an aperture stop and a second lens group arranged on the same optical axis from the object side to the image side, the first lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged on the same optical axis from the object side to the image side, and the second lens group comprises a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens and a sixteenth lens arranged on the same optical axis from the object side to the image side. The industrial lens of the present invention has the characteristics of small optical distortion, clear imaging, high relative illumination and excellent close-range imaging effect.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial lenses, and in particular to a high-magnification industrial lens and a camera device for machine vision. Background Art

[0002] With the rapid development of industrial automation, machine vision has been applied in various fields, greatly improving the production efficiency of various industries. Replacing the difficult manual vision with machine vision can effectively protect human interests and safety. Machine vision technology can be used to achieve special environments where manual work cannot work normally.

[0003] However, existing industrial lenses have problems such as large optical edge distortion, unclear imaging, low relative illumination, and poor close-range imaging, which cannot meet the needs of the machine vision market. Summary of the invention

[0004] In order to solve the above problems in the prior art, the present invention provides a high-magnification industrial lens and a camera device for machine vision, which meet the characteristics required by industrial lenses, such as small optical distortion, clear imaging, high relative illumination and excellent close-range imaging effect.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present invention provides a high-magnification industrial lens for machine vision, comprising an optical system, wherein the optical system comprises a first lens group, an aperture stop, and a second lens group arranged on the same optical axis from the object side to the image side, wherein the first lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged on the same optical axis from the object side to the image side, and the second lens group comprises a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, and a sixteenth lens arranged on the same optical axis from the object side to the image side;

[0007] The first lens is a meniscus lens with positive focal power, the second lens is a meniscus lens with negative focal power, the third lens is a meniscus lens with positive focal power, the fourth lens is a meniscus lens with positive focal power, the fifth lens is a meniscus lens with positive focal power, the sixth lens is a meniscus lens with positive focal power, the seventh lens is a biconvex lens with positive focal power, the eighth lens is a biconcave lens with negative focal power, the ninth lens is a biconvex lens with positive focal power, the tenth lens is a biconvex lens with positive focal power, the eleventh lens is a biconvex lens with positive focal power, the twelfth lens is a biconcave lens with negative focal power, the thirteenth lens is a biconvex lens with positive focal power, the fourteenth lens is a biconcave lens with negative focal power, the fifteenth lens is a biconcave lens with negative focal power, and the sixteenth lens is a meniscus lens with positive focal power.

[0008] The beneficial effects of the present invention are: by using sixteen lenses and reasonably setting the ratio range of the focal length of each lens to the focal length of the lens, a resolution of 65lp / mm, a large target surface of 1 / 2″, |optical distortion|≤0.025%, high relative illumination, and an image plane size of 8mm can be supported, meeting the requirements of machine vision.

[0009] Optionally, the first lens, the second lens and the third lens are combined into a cemented lens, the air gap between the third lens and the fourth lens is 0.1 mm, the air gap between the fourth lens and the fifth lens is 0.1 mm, the air gap between the fifth lens and the sixth lens is 0.1 mm, the air gap between the sixth lens and the aperture stop is 0.1 mm, the air gap between the aperture stop and the seventh lens is 0, the air gap between the seventh lens and the eighth lens is 24.2 mm, and the eighth lens and the ninth lens are combined into a cemented lens. The air space between the ninth lens and the tenth lens is 0.1 mm, the air space between the tenth lens and the eleventh lens is 46.0 mm, the eleventh lens and the twelfth lens are combined into a cemented lens, the air space between the twelfth lens and the thirteenth lens is 4.2 mm, the thirteenth lens and the fourteenth lens are combined into a cemented lens, the air space between the fourteenth lens and the fifteenth lens is 0.5 mm, the fifteenth lens and the sixteenth lens are combined into a cemented lens, and the air space between the sixteenth lens and the imaging plane is 27.2 mm.

[0010] Optionally, the total optical length TTL of the lens and the maximum image height IH corresponding to the maximum field of view angle of the lens satisfy:

[0011] 30≤TTL / IH≤34.

[0012] Optionally, the back focal length BFL of the lens and the total focal length F of the optical system satisfy:

[0013] 7.5≤BFL / F≤8.5.

[0014] Optionally, the focal length F1 of the first lens, the focal length F2 of the second lens, the focal length F3 of the third lens, the focal length F4 of the fourth lens, the focal length F5 of the fifth lens, the focal length F6 of the sixth lens, the focal length F7 of the seventh lens, the focal length F8 of the eighth lens, the focal length F9 of the ninth lens, the focal length F10 of the tenth lens, the focal length F11 of the eleventh lens, the focal length F12 of the twelfth lens, the focal length F13 of the thirteenth lens, the focal length F14 of the fourteenth lens, the focal length F15 of the fifteenth lens and the focal length F16 of the sixteenth lens and a total focal length F of the optical system composed of them satisfy the following focal length relationship:

[0015] 11 <F1 / F<14;

[0016] -10 <F2 / F<-7;

[0017] 8 <F3 / F<10;

[0018] 20 <F4 / F<24;

[0019] 27 <F5 / F<30;

[0020] 40 <F6 / F<42;

[0021] 11 <F7 / F<15;

[0022] -6 <F8 / F<-3;

[0023] 7 <F9 / F<10;

[0024] 9 <F10 / F<12;

[0025] 3 <F11 / F<5;

[0026] -5 <F12 / F<-2;

[0027] 1 <F13 / F<4;

[0028] -4 <F14 / F<-1;

[0029] -4 <F15 / F<0;

[0030] 2 <F16 / F<4。

[0031] Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens, the fourteenth lens, the fifteenth lens and the sixteenth lens are all spherical lenses made of glass.

[0032] In a second aspect, the present invention provides a camera device, comprising a photosensitive component and the lens of the first aspect;

[0033] The lens is mounted on the photosensitive component so that the photosensitive component is suitable for receiving light passing through the optical system and outputting imaging data.

[0034] Among them, the technical effect corresponding to the camera device provided in the second aspect refers to the relevant description of the high-magnification industrial lens for machine vision provided in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the optical structure of a high-magnification industrial lens for machine vision according to an embodiment of the present invention;

[0036] Figure 2 A modulation transfer function curve diagram of a high-magnification industrial lens for machine vision according to an embodiment of the present invention;

[0037] Figure 3 is a distortion curve diagram of a high-magnification industrial lens for machine vision according to an embodiment of the present invention;

[0038] Figure 4 The relative illumination curve of a high-magnification industrial lens for machine vision according to an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 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. Tenth lens; 11. Eleventh lens; 12. Twelfth lens; 13. Thirteenth lens; 14. Fourteenth lens; 15. Fifteenth lens; 16. Sixteenth lens; 17. Aperture stop; 18. Imaging surface. DETAILED DESCRIPTION

[0041] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0042] Embodiment 1

[0043] Please refer to Figure 1 A high-magnification industrial lens for machine vision includes an optical system, which includes a first lens group, an aperture stop 17 and a second lens group arranged on the same optical axis from the object side to the image side, the first lens group includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5 and a sixth lens 6 arranged on the same optical axis from the object side to the image side, and the second lens group includes a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, a fifteenth lens 15 and a sixteenth lens 16 arranged on the same optical axis from the object side to the image side. Among them, the first lens 1 is a meniscus lens with positive focal power, the second lens 2 is a meniscus lens with negative focal power, the third lens 3 is a meniscus lens with positive focal power, the fourth lens 4 is a meniscus lens with positive focal power, the fifth lens 5 is a meniscus lens with positive focal power, the sixth lens 6 is a meniscus lens with positive focal power, the seventh lens 7 is a biconvex lens with positive focal power, the eighth lens 8 is a biconcave lens with negative focal power, the ninth lens 9 is a biconvex lens with positive focal power, the tenth lens 10 is a biconvex lens with positive focal power, the eleventh lens 11 is a biconvex lens with positive focal power, the twelfth lens 12 is a biconcave lens with negative focal power, the thirteenth lens 13 is a biconvex lens with positive focal power, the fourteenth lens 14 is a biconcave lens with negative focal power, the fifteenth lens 15 is a biconcave lens with negative focal power, and the sixteenth lens 16 is a meniscus lens with positive focal power.

[0044] In this embodiment, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, the twelfth lens 12, the thirteenth lens 13, the fourteenth lens 14, the fifteenth lens 15 and the sixteenth lens 16 are all spherical lenses made of glass, which are easy to process and detect.

[0045] In this embodiment, the first lens 1, the second lens 2 and the third lens 3 are combined into a cemented lens, the air interval between the third lens 3 and the fourth lens 4 is 0.1 mm, the air interval between the fourth lens 4 and the fifth lens 5 is 0.1 mm, the air interval between the fifth lens 5 and the sixth lens 6 is 0.1 mm, the air interval between the sixth lens 6 and the aperture stop 17 is 0.1 mm, the air interval between the aperture stop 17 and the seventh lens 7 is 0, the air interval between the seventh lens 7 and the eighth lens 8 is 24.2 mm, the eighth lens 8 and the ninth lens 9 are combined into a cemented lens, and the ninth lens 9 is The air spacing between the tenth lens 10 and the eleventh lens 11 is 46.0 mm, the eleventh lens 11 and the twelfth lens 12 are combined into a cemented lens, the air spacing between the twelfth lens 12 and the thirteenth lens 13 is 4.2 mm, the thirteenth lens 13 and the fourteenth lens 14 are combined into a cemented lens, the air spacing between the fourteenth lens 14 and the fifteenth lens 15 is 0.5 mm, the fifteenth lens 15 and the sixteenth lens 16 are combined into a cemented lens, and the air spacing between the sixteenth lens 16 and the imaging plane 18 is 27.2 mm.

[0046] In this embodiment, the focal length F1 of the first lens 1, the focal length F2 of the second lens 2, the focal length F3 of the third lens 3, the focal length F4 of the fourth lens 4, the focal length F5 of the fifth lens 5, the focal length F6 of the sixth lens 6, the focal length F7 of the seventh lens 7, the focal length F8 of the eighth lens 8, the focal length F9 of the ninth lens 9, the focal length F10 of the tenth lens 10, the focal length F11 of the eleventh lens 11, the focal length F12 of the twelfth lens 12, the focal length F13 of the thirteenth lens 13, the focal length F14 of the fourteenth lens 14, the focal length F15 of the fifteenth lens 15 and the focal length F16 of the sixteenth lens 16 and the total focal length F of the optical system composed thereof satisfy the following focal length relationship:

[0047] 11 <F1 / F<14;

[0048] -10 <F2 / F<-7;

[0049] 8 <F3 / F<10;

[0050] 20 <F4 / F<24;

[0051] 27 <F5 / F<30;

[0052] 40 <F6 / F<42;

[0053] 11 <F7 / F<15;

[0054] -6 <F8 / F<-3;

[0055] 7 <F9 / F<10;

[0056] 9 <F10 / F<12;

[0057] 3 <F11 / F<5;

[0058] -5 <F12 / F<-2;

[0059] 1 <F13 / F<4;

[0060] -4 <F14 / F<-1;

[0061] -4 <F15 / F<0;

[0062] 2 <F16 / F<4。

[0063] Therefore, the numerical aperture of the industrial lens in this embodiment is obtained to be 0.4, the full field angle is 2°, the diagonal size of the imaging surface 18 is 8 mm, and the total optical length is the distance from the first lens 1 to the sixteenth lens 16 132.53 mm.

[0064] The total optical length TTL of the lens and the maximum image height IH corresponding to the maximum field angle of the lens satisfy: 30≤TTL / IH≤34, which is 33.1325 in this embodiment. The back focal length BFL of the lens and the total focal length F of the optical system satisfy: 7.5≤BFL / F≤8.5.

[0065] The optical parameters of each lens in this embodiment are shown in Table 1 below.

[0066] Table 1. Optical parameters of each lens in this embodiment

[0067]

[0068] It can be seen from Table 1 that the surface numbers are arranged in order from the object side to the image side. When the surface is a plane, the radius corresponds to infinity. Among them, the first lens 1, the second lens 2 and the third lens 3 are combined into a cemented lens, the eighth lens 8 and the ninth lens 9 are combined into a cemented lens, the eleventh lens 11 and the twelfth lens 12 are combined into a cemented lens, the thirteenth lens 13 and the fourteenth lens 14 are combined into a cemented lens, and the fifteenth lens 15 and the sixteenth lens 16 are combined into a cemented lens, that is, these lenses are bonded to each other, so there is only one surface here, plus the air gap between the aperture stop 17 and the seventh lens 7 is 0, so there are 26 surfaces in total.

[0069] Therefore, if Figure 2 As shown, Figure 1The cut-off frequency of the high-magnification industrial lens for machine vision shown in the figure is 65lp / mm at the full field of view, the corresponding modulation transfer function value is better than 0.3, and the modulation transfer function curves of each field of view are relatively concentrated, indicating that the high-magnification industrial lens for machine vision in this embodiment can achieve high-precision detection of targets. Wherein, OTF is the optical transfer function.

[0070] like Figure 3 As shown, Figure 1 A high-magnification industrial lens for machine vision shown in the figure has a distortion value of less than 0.025% within the full field of view, achieving low distortion.

[0071] like Figure 4 As shown, Figure 1 The high-magnification industrial lens for machine vision shown in the figure has a relative illumination value greater than 90% in the entire field of view, avoiding the occurrence of dark corners.

[0072] Embodiment 2

[0073] This embodiment provides a camera device, including a photosensitive component and a high-magnification industrial lens for machine vision in Embodiment 1. The lens is mounted on the photosensitive component, so that the photosensitive component is suitable for receiving light passing through the optical system and outputting imaging data.

[0074] In summary, the industrial lens of this embodiment has the characteristics of small optical distortion, clear imaging, high relative illumination and excellent close-range imaging effect.

[0075] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0076] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0078] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0079] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A high-magnification industrial lens for machine vision, characterized in that: An optical system is provided, wherein the optical system comprises only a first lens group, an aperture stop, and a second lens group which are arranged on the same optical axis from the object side to the image side, wherein the first lens group comprises only a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens which are arranged on the same optical axis from the object side to the image side, and wherein the second lens group comprises only a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, and a sixteenth lens which are arranged on the same optical axis from the object side to the image side; The first lens is a meniscus lens with positive focal power, the second lens is a meniscus lens with negative focal power, the third lens is a meniscus lens with positive focal power, the fourth lens is a meniscus lens with positive focal power, the fifth lens is a meniscus lens with positive focal power, the sixth lens is a meniscus lens with positive focal power, the seventh lens is a biconvex lens with positive focal power, the eighth lens is a biconcave lens with negative focal power, the ninth lens is a biconvex lens with positive focal power, the tenth lens is a biconvex lens with positive focal power, the eleventh lens is a biconvex lens with positive focal power, the twelfth lens is a biconcave lens with negative focal power, the thirteenth lens is a biconvex lens with positive focal power, the fourteenth lens is a biconcave lens with negative focal power, the fifteenth lens is a biconcave lens with negative focal power, and the sixteenth lens is a meniscus lens with positive focal power; Wherein, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens all have a concave object side and a convex image side, and the object side of the sixteenth lens is a convex surface and the image side is a concave surface; The focal length F1 of the first lens, the focal length F2 of the second lens, the focal length F3 of the third lens, the focal length F4 of the fourth lens, the focal length F5 of the fifth lens, the focal length F6 of the sixth lens, the focal length F7 of the seventh lens, the focal length F8 of the eighth lens, the focal length F9 of the ninth lens, the focal length F10 of the tenth lens, the focal length F11 of the eleventh lens, the focal length F12 of the twelfth lens, the focal length F13 of the thirteenth lens, the focal length F14 of the fourteenth lens, the focal length F15 of the fifteenth lens and the focal length F16 of the sixteenth lens, and the total focal length F of the optical system composed of them satisfy the following focal length relationship: 11 <F1 / F<14; -10 <F2 / F<-7; 8 <F3 / F<10; 20 <F4 / F<24; 27 <F5 / F<30; 40 <F6 / F<42; 11 <F7 / F<15; -6 <F8 / F<-3; 7 <F9 / F<10; 9 <F10 / F<12; 3 <F11 / F<5; -5 <F12 / F<-2; 1 <F13 / F<4; -4 <F14 / F<-1; -4 <F15 / F<0; 2 <F16 / F<4。 2. A high-magnification industrial lens for machine vision according to claim 1, characterized in that: The first lens, the second lens and the third lens are combined into a cemented lens, the air gap between the third lens and the fourth lens is 0.1 mm, the air gap between the fourth lens and the fifth lens is 0.1 mm, the air gap between the fifth lens and the sixth lens is 0.1 mm, the air gap between the sixth lens and the aperture stop is 0.1 mm, the air gap between the aperture stop and the seventh lens is 0, the air gap between the seventh lens and the eighth lens is 24.2 mm, the eighth lens and the ninth lens are combined into a cemented lens, The air space between the ninth lens and the tenth lens is 0.1 mm, the air space between the tenth lens and the eleventh lens is 46.0 mm, the eleventh lens and the twelfth lens are combined into a cemented lens, the air space between the twelfth lens and the thirteenth lens is 4.2 mm, the thirteenth lens and the fourteenth lens are combined into a cemented lens, the air space between the fourteenth lens and the fifteenth lens is 0.5 mm, the fifteenth lens and the sixteenth lens are combined into a cemented lens, and the air space between the sixteenth lens and the imaging plane is 27.2 mm.

3. The high-magnification industrial lens for machine vision according to claim 1, characterized in that: The total optical length TTL of the lens and the maximum image height IH corresponding to the maximum field of view of the lens satisfy: 30≤TTL / IH≤34.

4. The high-magnification industrial lens for machine vision according to claim 2, characterized in that: The back focal length BFL of the lens and the total focal length F of the optical system satisfy: 7.5≤BFL / F≤8.

5.

5. A high magnification industrial lens for machine vision according to any one of claims 2 to 4, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens, the fourteenth lens, the fifteenth lens and the sixteenth lens are all spherical lenses made of glass.

6. A camera device, characterized in that: Comprising a photosensitive component and the lens according to any one of claims 1 to 5; The lens is mounted on the photosensitive component so that the photosensitive component is suitable for receiving light passing through the optical system and outputting imaging data.

Images