Lens assembly, lighting device and visual sensor

Abstract

The utility model relates to a lens assembly, a lighting device and a visual sensor. The lens assembly comprises at least two lens sets, the lens sets comprise the first lens set and the second lens set, the first lens set comprises two first lenses which are symmetrically arranged at intervals, the first surfaces of the first lenses are provided with a plurality of side-by-side first polarization inclined planes, and the second surfaces of the first lenses are arranged to be first condensation curved surfaces; the first lens is used for providing first-angle incident light, and the first-angle incident light covers a high-angle illumination area of the first lens group; the second lens group comprises two second lenses which are symmetrically arranged at an interval, the first surfaces of the second lenses are provided with a plurality of second polarization inclined planes which are arranged side by side, the second surfaces of the second lenses are arranged to be second condensation curved surfaces, the second lenses are used for providing second-angle incident light, and the second-angle incident light covers a low-angle illumination area of the second lens group. The lens assembly can provide high-angle illumination incident light and low-angle illumination incident light, so that the lighting capability is refined and enhanced.

Description

Technical Field

[0001] The present application relates to the field of lighting technology, and in particular to a lens assembly, a lighting device and a visual sensor. Background Art

[0002] In the field of industrial vision, the lighting requirements for illumination imaging are high, and the incident angle of light on the imaging surface has different requirements according to different application scenarios. The lighting of industrial vision sensors and industrial barcode scanner products is generally integrated into a high-angle incident light lighting method, which cannot provide low-angle incident light, resulting in poor imaging in some application scenarios.

[0003] The lighting design of existing industrial vision sensors and industrial barcode scanner products mainly involves arranging LED lamp beads around the lens module, using LED lamp beads to directly illuminate the scene, or using lenses to focus the emitted light of the LED lamp beads to illuminate the scene, which often leads to limited lighting angles.

[0004] Therefore, there is an urgent need for a lens assembly, an illumination device and a visual sensor to solve the above technical problems. Utility Model Content

[0005] Based on this, it is necessary to provide a lens assembly, a lighting device and a visual sensor to address the above-mentioned technical problems, which can provide low-angle incident light and high-angle incident light to the lighting area, thereby refining and enhancing the lighting capability.

[0006] In a first aspect, the present application provides a lens assembly, comprising at least two lens groups, wherein at least two of the lens groups include:

[0007] A first lens group includes two first lenses symmetrically arranged at intervals, a first surface of the first lens is provided with a plurality of first polarizing inclined planes arranged side by side, the tips of the first polarizing inclined planes corresponding to the two first lenses respectively extend in directions away from each other, a second surface of the first lens is provided with a first focusing curved surface, the first lens is used to provide a first angle incident light, and the first angle incident light covers a high-angle illumination area of ​​the first lens group;

[0008] The second lens group is arranged in parallel and at intervals on one side of the first lens group. The second lens group includes two second lenses that are symmetrically arranged at intervals. The first surface of the second lens is provided with a plurality of second polarizing inclined surfaces arranged side by side. The tips of the second polarizing inclined surfaces corresponding to the two second lenses extend in directions approaching each other. The second surface of the second lens is set as a second focusing curved surface. The second lens is used to provide a second angle incident light, and the second angle incident light covers the low-angle illumination area of ​​the second lens group.

[0009] In a second aspect, the present application provides a lighting device, comprising: an LED lamp bead and a lens assembly as described in any of the above schemes, wherein the LED lamp bead is used to illuminate the lens assembly.

[0010] In a third aspect, the present application provides a visual sensor, comprising the lighting device as described above.

[0011] The above-mentioned lens assembly adjusts the inclination angles of the first polarizing bevel and the second polarizing bevel respectively, and according to the principle of refraction, adjusts the incident angle and distribution of the illumination light, so that the first lens provides first-angle incident light, and the first-angle incident light covers the high-angle illumination area of ​​the first lens group, and the second lens provides second-angle incident light, and the second-angle incident light covers the low-angle illumination area of ​​the second lens group, thereby refining and enhancing the lighting capability; the first polarizing bevel and the second polarizing bevel can also be set with different partitions respectively to adjust the illumination distribution of the entire lens assembly on the required brightening area to adapt to different field of view requirements.

[0012] The above-mentioned lighting device includes LED lamp beads and the above-mentioned lens assembly. The lens assembly is illuminated by the LED lamp beads. The lens assembly can provide high-angle incident light and low-angle incident light, thereby enhancing the compatibility of the lighting capability of the lighting device.

[0013] The above-mentioned visual sensor, including the above-mentioned lighting device, can provide high-angle incident light and low-angle incident light, and has a wide range of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A top view of a lens assembly provided in an embodiment of the present application;

[0015] Figure 2 A three-dimensional view of a lens assembly provided for an embodiment of the present application;

[0016] Figure 3 A schematic diagram of the structure of the first lens provided in an embodiment of the present application;

[0017] Figure 4 A schematic diagram of the structure of the second lens provided in an embodiment of the present application;

[0018] Figure 5 A diagram of the illumination area after the first lens group provides light focusing according to an embodiment of the present application;

[0019] Figure 6 This is a diagram of the illumination area after the second lens group provides an embodiment of the present application to focus light. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] The lens assembly provided in the embodiment of the present application aims to solve the problem in the prior art that the illumination angle is limited by focusing the outgoing light to illuminate the scene, and can provide low-angle incident light and high-angle incident light to the illumination area, thereby refining and enhancing the lighting capability. The lens assembly can be applied to the field of industrial vision.

[0022] like Figure 1-Figure 6 As shown, the lens assembly includes at least two lens groups, the at least two lens groups include a first lens group 100 and a second lens group 200, the first lens group 100 includes two first lenses 110 arranged symmetrically at intervals, a first surface of the first lens 110 is provided with a plurality of first polarizing inclined planes 111 arranged side by side, the tips of the first polarizing inclined planes 111 corresponding to the two first lenses 110 respectively extend in directions away from each other, the second surface of the first lens 110 is provided with a first focusing curved surface 112, the first lens 110 is used to provide a first angle incident light, and the first angle incident light covers the first lens group 100. The second lens group 200 is arranged in parallel and spaced on one side of the first lens group 100, and the second lens group 200 includes two second lenses 210 arranged symmetrically at intervals. The first surface of the second lens 210 is provided with a plurality of second polarization slopes 211 arranged side by side, and the tips of the second polarization slopes 211 corresponding to the two second lenses 210 extend in the direction of approaching each other, and the second surface of the second lens 210 is provided with a second focusing curved surface 212. The second lens 210 is used to provide a second angle incident light, and the second angle incident light covers the low angle illumination area of ​​the second lens group 200. It should be noted that, in this embodiment, the line connecting the lens and the center of the illumination area is defined as the illumination line, and the angle between the illumination line and the vertical plane is defined as the illumination angle. The closer the illumination line is to the horizontal plane, the higher the illumination angle of the illumination area, and the smaller the illumination angle. The closer the illumination line is to the horizontal plane, the lower the illumination angle of the illumination area, and the larger the illumination angle. The illumination angle of the high angle illumination area mentioned in this embodiment is smaller than the illumination angle of the low angle illumination area.

[0023] It can be seen that in the embodiment of the present application, the above-mentioned lens assembly adjusts the incident angle and distribution of the illumination light according to the principle of refraction by respectively adjusting the inclination angles of the first polarizing bevel 111 and the second polarizing bevel 211, so that the first lens 110 provides first-angle incident light, and the first-angle incident light covers the high-angle illumination area of ​​the first lens group 100, and the second lens 210 provides second-angle incident light, and the second-angle incident light covers the low-angle illumination area of ​​the second lens group 200, thereby refining and enhancing the lighting capability; the first polarizing bevel 111 and the second polarizing bevel 211 can also be respectively set to different partitions to adjust the illumination distribution of the entire lens assembly on the required illuminated area to adapt to different field of view requirements.

[0024] In some embodiments, the inclination angles of all first polarizing bevels 111 can be set to be smaller than the inclination angles of all second polarizing bevels 211, then the first lens group 100 provides a high-angle illumination area, and the second lens group 200 provides a low-angle illumination area, thereby making the illumination angle of the high-angle illumination area smaller than the illumination angle of the low-angle illumination area. For example, the illumination angle θ of the high-angle illumination area can range from 0°﹤θ﹤11°, and the illumination angle α of the low-angle illumination area can range from 11°﹤α﹤30°. Secondly, in actual design, in order to correct the deformation of the light beam during propagation, the inclination angles of some first polarizing bevels 111 are smaller than the inclination angles of some second polarizing bevels 211, and the inclination angles of the remaining first polarizing bevels 111 can be set to be equal to the inclination angles of the second polarizing bevels 211, so as to obtain the illumination distribution on the desired highlighted area.

[0025] In some embodiments, Figure 3 As shown, a structural schematic diagram of the first lens 110 is provided, wherein the first polarizing inclined plane 111 of the first lens 110 includes a first serrated inclined plane 1111 and a second serrated inclined plane 1112, a plurality of first serrated inclined planes 1111 are arranged side by side, and second serrated inclined planes 1112 are respectively convexly provided on the corresponding innermost first serrated inclined planes 1111 of the two first lenses 110.

[0026] It can be seen that in this embodiment, by arranging a plurality of first serrated bevel portions 1111 arranged side by side, and arranging a second serrated bevel portion 1112 on the innermost first serrated bevel portion 1111 of each first lens 110, different light rays can be fine-tuned so that the illumination area will not be deformed due to the polarization design, and the illumination in the illumination area is uniform. Secondly, the plurality of bevel portions can effectively reduce the volume of the first lens 110.

[0027] In some embodiments, the inclination angle of the outermost first sawtooth bevel portions 1111 of the two first lenses 110 is smaller than the inclination angles of the remaining first sawtooth bevel portions 1111 , and the inclination angle of the second sawtooth bevel portion 1112 is greater than the inclination angles of all the first sawtooth bevel portions 1111 .

[0028] It can be seen that in this embodiment, by setting the inclination angle of the outermost first serrated bevel portion 1111 of each first lens 110 to be smaller than the inclination angles of the remaining first serrated bevel portions 1111, and the inclination angle of the second serrated bevel portion 1112 to be larger than the inclination angles of all the first serrated bevel portions 1111, the high-angle illumination areas covered by the first-angle incident light of the two first lenses 110 can be superimposed on each other, so as to improve the lighting effect of the high-angle illumination incident light.

[0029] In this embodiment, four first sawtooth bevel portions 1111 are arranged side by side. In other embodiments, the number of the first sawtooth bevel portions 1111 can be set to other numbers, such as three or five, etc., as required.

[0030] In some embodiments, Figure 4 As shown, a structural schematic diagram of the second lens 210 is provided, and the second polarization inclined plane 211 of the second lens 210 includes a third sawtooth inclined plane 2111 and a fourth sawtooth inclined plane 2112, and a plurality of third sawtooth inclined planes 2111 are arranged side by side, and each third sawtooth inclined plane 2111 is convexly provided with a fourth sawtooth inclined plane 2112.

[0031] It can be seen that in this embodiment, by providing the third sawtooth bevel portion 2111 and the fourth sawtooth bevel portion 2112, each third sawtooth bevel portion 2111 is convexly provided with the fourth sawtooth bevel portion 2112, and by providing the fourth sawtooth bevel portion 2112, the fourth sawtooth bevel portion 2112 is convexly provided on a partial area of ​​the third sawtooth bevel portion 2111, so that the overall thickness of the second lens 210 can be effectively reduced, thereby reducing the volume of the second lens 210; and by providing the third sawtooth bevel portion 2111 and the fourth sawtooth bevel portion 2112, the bevel portion of the second lens 210 is divided into more partitions, and the bevel portions with different partitions can adjust the distribution of the entire illumination light on the desired brightening area, so that the polarization amplitude of the illumination area is larger. It should be noted that the inclination angle of the bevel portion needs to be determined according to the relationship among the lens installation height, the lens position and the illumination area, so that different inclination angles can be used to refine and adjust the incident light distribution.

[0032] In some embodiments, the inclination angle of the corresponding innermost third sawtooth bevel portions 2111 of the two second lenses 210 is smaller than the inclination angles of the remaining third sawtooth bevel portions 2111 , and the inclination angle of the innermost fourth sawtooth bevel portions 2112 is smaller than the inclination angles of the remaining fourth sawtooth bevel portions 2112 .

[0033] It can be seen that in this embodiment, by setting the inclination angle of the innermost third serrated bevel portion 2111 of each second lens 210 to be smaller than the inclination angles of the remaining third serrated bevel portions 2111, and the inclination angle of the innermost fourth serrated bevel portion 2112 of each second lens 210 to be smaller than the inclination angles of the remaining fourth serrated bevel portions 2112, more detailed fine-tuning of different incident light can be performed.

[0034] In this embodiment, four third sawtooth bevel portions 2111 are arranged side by side. In other embodiments, the number of the third sawtooth bevel portions 2111 can be set to other numbers, such as three or five, etc., as required.

[0035] In some embodiments, see Figure 3 and Figure 4 , Figure 3 A schematic diagram of the structure of the first lens is provided. Figure 4 A schematic diagram of the structure of the second lens is provided, and the first focusing curved surface 112 and the second focusing curved surface 212 have the same structure. The first focusing curved surface 112 and the second focusing curved surface 212 can both be convex lenses with free-form surfaces, which use the principle of refraction to focus light, which is consistent with the focusing principle of a plano-convex lens, but the focusing curved surface is an aspherical surface. This setting is to make the light distribution more uniform, share the light regulation pressure of the inclined surface, and make the design of the inclined surface simpler. Secondly, in this embodiment, by setting the first focusing curved surface 112 and the second focusing curved surface 212 to have the same structure, the structure can be effectively simplified and the processing difficulty can be reduced.

[0036] Based on the same utility model concept, the embodiment of the present application further provides a lighting device, and the implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned lens assembly.

[0037] The lighting device includes LED lamp beads and the above-mentioned lens assembly. When in use, the LED lamp beads are arranged around the lens assembly. For example, four LED lamp beads can be arranged evenly distributed around the lens assembly. The lens assembly is used to focus the emitted light of the LED lamp beads to illuminate the scene. The lens assembly converges the emitted light into a light-emitting angle of 22 degrees horizontally and 33 degrees vertically to ensure that the field of view of application equipment such as visual sensors can be illuminated by the lighting system when it is within this range. Alternatively, the corresponding LED lamp beads can be switched on and off as needed to control the overall lighting area to be illuminated by low-angle lighting incident light, high-angle lighting incident light, or a combination of low-angle lighting incident light and high-angle lighting incident light.

[0038] The above-mentioned lighting device illuminates the lens assembly through LED lamp beads, and the lens assembly can provide high-angle incident light and low-angle incident light, thereby enhancing the compatibility of the lighting capability of the lighting device.

[0039] Based on the same utility model concept, the embodiment of the present application further provides a visual sensor. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned lighting device.

[0040] The visual sensor includes the above-mentioned lighting device, which can provide high-angle incident light and low-angle incident light and has a wide range of application scenarios.

[0041] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A lens assembly, characterized in that Comprising at least two lens groups, at least two of the lens groups comprising: A first lens group (100) comprises two first lenses (110) arranged symmetrically at an interval, a first surface of the first lens (110) being provided with a plurality of first polarizing inclined planes (111) arranged side by side, the tips of the first polarizing inclined planes (111) corresponding to the two first lenses (110) respectively extending in directions away from each other, a second surface of the first lens (110) being provided with a first focusing curved surface (112), the first lens (110) being used to provide incident light at a first angle, the incident light at the first angle covering a high-angle illumination area of ​​the first lens group (100); The second lens group (200) is arranged in parallel and at intervals on one side of the first lens group (100), the second lens group (200) comprises two second lenses (210) arranged symmetrically at intervals, a first surface of the second lens (210) is provided with a plurality of second polarizing inclined surfaces (211) arranged side by side, the tips of the second polarizing inclined surfaces (211) corresponding to the two second lenses (210) respectively extend in a direction approaching each other, the second surface of the second lens (210) is provided as a second focusing curved surface (212), the second lens (210) is used to provide incident light at a second angle, and the incident light at the second angle covers a low-angle illumination area of ​​the second lens group (200).

2. The lens assembly according to claim 1, characterized in that The first polarizing inclined plane (111) comprises a first sawtooth inclined surface (1111) and a second sawtooth inclined surface (1112); a plurality of the first sawtooth inclined surfaces (1111) are arranged side by side, and the second sawtooth inclined surface (1112) is convexly provided on the corresponding innermost first sawtooth inclined surfaces (1111) of the two first lenses (110).

3. The lens assembly according to claim 2, characterized in that: The inclination angle of the outermost first sawtooth bevel portions (1111) of the two first lenses (110) is smaller than the inclination angle of the remaining first sawtooth bevel portions (1111), and the inclination angle of the second sawtooth bevel portion (1112) is larger than the inclination angle of all the first sawtooth bevel portions (1111).

4. The lens assembly according to claim 2, characterized in that: Four of the first sawtooth inclined surface portions (1111) are arranged side by side.

5. The lens assembly according to claim 1, wherein: The second polarizing inclined plane (211) comprises a third sawtooth inclined plane (2111) and a fourth sawtooth inclined plane (2112), a plurality of the third sawtooth inclined planes (2111) are arranged side by side, and each of the third sawtooth inclined planes (2111) is convexly provided with the fourth sawtooth inclined plane (2112).

6. The lens assembly according to claim 5, characterized in that The inclination angle of the corresponding innermost third sawtooth bevel portion (2111) of the two second lenses (210) is smaller than the inclination angle of the remaining third sawtooth bevel portion (2111), and the inclination angle of the innermost fourth sawtooth bevel portion (2112) is smaller than the inclination angle of the remaining fourth sawtooth bevel portion (2112).

7. The lens assembly according to claim 5, characterized in that Four third sawtooth bevel portions (2111) are arranged side by side.

8. The lens assembly according to claim 1, wherein: The first light-concentrating curved surface (112) and the second light-concentrating curved surface (212) have the same structure.

9. A lighting device, characterized in that: It comprises an LED lamp bead and a lens assembly as described in any one of claims 1 to 8, wherein the LED lamp bead is used to illuminate the lens assembly.

10. A visual sensor, characterized in that Comprising the lighting device as claimed in claim 9.

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