Illumination assembly and optical recognition device

Abstract

The utility model discloses a kind of lighting assembly and optical identification device, it is related to optical identification technical field, wherein, the lighting assembly is used to give optical identification device light compensation, the lighting assembly includes mounting plate and lighting module, the mounting plate has light transmission area, for the lens of optical identification device identifies image, the periphery of the light transmission area is formed with illumination area, the lighting module is located in the illumination area, the lighting module includes multiple light emitting pieces and multiple lenses, multiple the light emitting piece is mutually spaced, each the lens cover is located in the light emitting piece, with the light emitting piece one-to-one correspondence setting, so that the light emitting piece is located on the optical axis of the lens, the optical power of each the lens is positive.The technical scheme provided by the utility model, by setting multiple light emitting pieces around light transmission area, and multiple lenses are set corresponding to multiple light emitting pieces, so as to ensure that the spot uniformity on target illumination surface is high, and edge cutoff is good.

Description

Technical Field

[0001] This utility model relates to the field of optical recognition technology, and in particular to an illumination component and an optical recognition device. Background Technology

[0002] Barcode readers are core devices for product tracking and traceability in industrial automation, collecting data by automatically identifying carriers such as 1D / 2D barcodes and RFID tags. To ensure clear reading, barcode readers are often equipped with lighting components to supplement the light for the reader's recognition lens.

[0003] Traditional barcode reader illumination components produce light spots with unclear boundaries on the target illumination surface, resulting in significant differences in brightness between the edges and the center. The light spot edges may even be excessively diffused, exhibiting poor cutoff. This can easily cause glare for users, leading to visual fatigue and significantly impacting decoding performance. Some barcode readers use array lenses to reshape the light spot, achieving a uniform and well-cutoff light spot. However, array lenses have complex surface shapes, are difficult to manufacture, and are costly. Utility Model Content

[0004] The main objective of this invention is to provide an illumination component and an optical recognition device, which is designed to provide an illumination component that is simple in structure, easy to manufacture, and capable of producing a uniform light spot with good cutoff.

[0005] To achieve the above objectives, this utility model proposes an illumination component for supplementing light to an optical recognition device, the illumination component comprising:

[0006] The mounting plate has a light-transmitting area for the lens of the optical recognition device to recognize the image, and an illumination area is formed around the light-transmitting area;

[0007] An illumination module is disposed in the illumination area. The illumination module includes multiple light-emitting elements and multiple lenses. The multiple light-emitting elements are arranged at intervals. Each lens covers the light-emitting element and is arranged in a one-to-one correspondence with the light-emitting element, so that the light-emitting element is located on the optical axis of the lens, and the optical power of each lens is positive.

[0008] In one embodiment, multiple lighting areas are provided, and the multiple lighting areas are distributed at intervals along the circumferential direction; or,

[0009] The lighting area is provided in two parts, and the light-transmitting area is located between the two lighting areas.

[0010] In one embodiment, two lighting areas are provided, the two lighting areas are spaced apart in a first direction, and the light-transmitting area is located between the two lighting areas;

[0011] The lighting module is provided in two parts and is located in two lighting areas. Each lighting module includes multiple light-emitting groups spaced apart in a second direction. Each light-emitting group includes multiple light-emitting elements spaced apart in a first direction and multiple lenses correspondingly arranged therein.

[0012] In one embodiment, the lighting module further includes a bracket having multiple transmission areas, each of which corresponds to one of the multiple light-emitting elements.

[0013] The plurality of lenses are respectively disposed in the plurality of the transmission regions.

[0014] In one embodiment, the plurality of lenses and the bracket are integrally disposed.

[0015] In one embodiment, each of the brackets is detachably mounted on the mounting plate.

[0016] In one embodiment, the light-incident surface of each lens is configured as a concave surface, and the light-exit surface is configured as a convex surface.

[0017] In one embodiment, the lens is configured as an optical glass lens, an acrylic lens, or a polycarbonate lens.

[0018] This utility model also proposes an optical recognition device, including the above-mentioned illumination component, wherein the illumination component includes:

[0019] The mounting plate has a light-transmitting area for the lens of the optical recognition device to recognize the image, and an illumination area is formed around the light-transmitting area;

[0020] An illumination module is disposed in the illumination area. The illumination module includes multiple light-emitting elements and multiple lenses. The multiple light-emitting elements are arranged at intervals. Each lens covers the light-emitting element and is arranged in a one-to-one correspondence with the light-emitting element, so that the light-emitting element is located on the optical axis of the lens, and the optical power of each lens is positive.

[0021] In one embodiment, the optical identification device includes a barcode reader.

[0022] The technical solution of this utility model, by setting an illumination area around the light-transmitting area, allows the illumination module in the illumination area to effectively supplement the lens in the light-transmitting area, thus enabling the lens to accurately recognize images. By setting multiple light-emitting elements, the light spots formed by each element on the target illumination surface can overlap, thereby increasing the overall brightness of the light spot. By setting lenses with positive optical power corresponding to each light-emitting element, the light emitted by the light-emitting elements is focused, improving both the uniformity and edge cutoff of the light spot. This solution has a simple structure, is easy to manufacture, and can achieve high uniformity of the light spot and good edge cutoff at the target illumination surface. It improves the decoding success rate while reducing user visual fatigue, thereby improving work efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of an embodiment of the lighting component provided by this utility model;

[0025] Figure 2 for Figure 1 A schematic diagram of the central lighting component from another perspective;

[0026] Figure 3 for Figure 1 Schematic diagram of the structure of the middle lens and the light-emitting element;

[0027] Figure 4 for Figure 1 A top view of the middle lens on the light-emitting surface side;

[0028] Figure 5 for Figure 1 A schematic diagram of the cross-section of the middle lens along the minor axis Lx;

[0029] Figure 6 for Figure 1 A schematic diagram of the cross-section of the middle lens along its major axis Ly.

[0030] Figure 7 for Figure 1 A schematic diagram showing the overlapping light spots of the central illumination component on the target illumination surface;

[0031] Figure 8 for Figure 1 Schematic diagram of the light intensity distribution curves of the middle lens in the Lx and Ly directions;

[0032] Figure 9 for Figure 1 Illuminance diagram of the central lighting component on the target lighting surface.

[0033] Explanation of icon numbers:

[0034] 100. Lighting component; 1. Mounting plate; 11. Light-transmitting area; 12. Lighting area; 2. Lighting module; 21. Light-emitting element; 22. Lens; 221. Light-incident surface; 222. Light-emitting surface; 23. Bracket; 231. Transmission area.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0037] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0039] Traditional barcode reader illumination components produce light spots with unclear boundaries on the target illumination surface, resulting in significant differences in brightness between the edges and the center. The light spot edges may even be excessively diffused, exhibiting poor cutoff. This can easily cause glare for users, leading to visual fatigue and significantly impacting decoding performance. Some barcode readers use array lenses to reshape the light spot, achieving a uniform and well-cutoff light spot. However, array lenses have complex surface shapes, are difficult to manufacture, and are costly.

[0040] Therefore, the main objective of this invention is to provide a lighting component that achieves uniform illuminance and good cutoff of the light spot generated by the lighting component in a simple structural form.

[0041] Please refer to Figure 1 and Figure 2 The lighting assembly 100 includes a mounting plate 1 and a lighting module 2. The mounting plate 1 has a light-transmitting area 11 for the lens of the optical recognition device to recognize the image. An illumination area 12 is formed around the light-transmitting area 11. The lighting module 2 is disposed in the illumination area 12. The lighting module 2 includes multiple light-emitting elements 21 and multiple lenses 22. The multiple light-emitting elements 21 are arranged at intervals. Each lens 22 covers the light-emitting element 21 and is arranged in a one-to-one correspondence with the light-emitting element 21, so that the light-emitting element 21 is located on the optical axis of the lens 22, and the optical power of each lens 22 is positive.

[0042] The technical solution of this utility model, by setting an illumination area 12 around the light-transmitting area 11, allows the illumination module 2 on the illumination area 12 to effectively supplement the lens at the light-transmitting area 11, thus enabling the lens to accurately recognize images. By setting multiple light-emitting elements 21, the light spots formed by each element on the target illumination surface can overlap, thereby improving the overall brightness of the light spot. By setting lenses 22 with positive optical power corresponding to each light-emitting element 21, the light emitted by the light-emitting elements 21 is focused, improving both the uniformity and edge cutoff of the light spot. This solution has a simple structure, is easy to manufacture, and can achieve high uniformity and good edge cutoff of the light spot at the target illumination surface. It improves the decoding success rate while reducing user visual fatigue, thereby improving work efficiency.

[0043] It is understood that setting the optical power of lens 22 to a positive value in this solution does not limit the specific surface shape of lens 22. In a preferred embodiment of this solution, please refer to... Figure 3The light-incident surface 221 of the lens 22 is concave, and the light-exit surface 222 is convex. The light-incident surface 221 is closer to the light-emitting element 21, and the light-exit surface 222 is farther away from the light-emitting element 21. This arrangement allows the light-emitting element 21 to be positioned closer to the center of the lens 22, which not only allows the lens 22 to receive the light emitted by the light-emitting element 21 more comprehensively, but also makes the overall structure more compact and improves its stability.

[0044] It is worth mentioning that this solution does not impose specific restrictions on the material of lens 22. It can be set as optical glass lens 22, acrylic lens 22 or polycarbonate lens 22. The above materials are lightweight and have high light transmittance, making them very suitable for making lens 22.

[0045] It should be noted that this solution does not limit the specific implementation of the light-transmitting area 11. For example, it can be set as a through hole, so that light can pass directly through the through hole into the lens of the optical recognition device. It can also be set as a transparent plate, so that light can be transmitted from the transparent plate and enter the lens of the optical recognition device.

[0046] It is worth mentioning that the light-emitting element 21 in this solution is set as an LED (light-emitting diode). LEDs have advantages such as low power consumption, long life, small size, fast response, easy dimming and multi-color integration, making them very suitable as the light source of the lighting component 100.

[0047] It should also be noted that this solution does not limit the number or arrangement of the illumination areas 12. In one embodiment of this solution, multiple illumination areas 12 are provided, and these multiple illumination areas 12 are distributed at intervals along the circumferential direction. With this arrangement, the light spots generated by the illumination modules 2 in each illumination area 12 overlap and converge at the position corresponding to the light-transmitting area 11 in the center, thereby ensuring the illumination brightness at the target illumination surface and further improving the uniformity of the illumination light spots. In another embodiment of this solution, two illumination areas 12 are provided, with the light-transmitting area 11 located between the two illumination areas 12. This arrangement is simple in structure, easy to deploy, and can meet the illumination needs of most optical recognition devices.

[0048] Furthermore, two illumination areas 12 are provided, spaced apart in the first direction. A light-transmitting area 11 is located between the two illumination areas 12. Two illumination modules 2 are provided, each located in one of the two illumination areas 12. Each illumination module 2 includes multiple light-emitting groups spaced apart in the second direction. Each light-emitting group includes multiple light-emitting elements 21 spaced apart in the first direction and multiple lenses 22 correspondingly arranged. With this configuration, given two illumination areas 12, the light-emitting elements 21 are distributed in a rectangular array within the illumination areas 12, thereby further improving the uniformity of the light spot. Since the light-transmitting area 11 is located between the two illumination areas 12, by arranging the multiple light-emitting elements 21 in a rectangular pattern, a rectangular light spot is formed at the position of the light-transmitting area 11 corresponding to the target illumination surface, thus achieving good image adaptation.

[0049] Of course, to better form a rectangular light spot, please refer to... Figure 4 In one embodiment, the field of view of the lens is rectangular, and the projection surface of the lens 22 on the mounting plate 1 is set as a rounded rectangle. With this configuration, the light spots formed by each lens 22 are rounded rectangles, and after being superimposed, they form a larger rounded rectangle, thus achieving a good fit with the field of view of the lens. It is worth mentioning that, for a more harmonious and aesthetically pleasing appearance, the light-transmitting area 11 is set as a rectangle.

[0050] To facilitate the assembly of the lenses 22, in one embodiment of this invention, the lighting module 2 further includes a bracket 23. The bracket 23 has multiple transmission areas 231, each corresponding to a plurality of light-emitting elements 21. The lenses 22 are respectively disposed in the multiple transmission areas 231. This arrangement significantly reduces assembly difficulty by directly placing the lenses 22 in the transmission areas 231 and then assembling the bracket 23 onto the mounting plate 1. Compared to assembling each lens 22 individually onto the light-emitting elements 21, this saves considerable time and improves work efficiency.

[0051] It should be noted that this solution does not limit the specific implementation of the lens 22 on the bracket 23. In a preferred embodiment, the lens 22 and the bracket 23 are manufactured as a single piece, and the material of the lens 22 is exactly the same as that of the bracket 23, which can be optical glass, acrylic, or polycarbonate. This arrangement reduces the number of openings in the overall structure, making the overall structure more stable. In another embodiment, a mounting hole is provided on the transmission area 231, and the lens 22 is mounted on the mounting hole. This arrangement provides greater flexibility in the overall structure and facilitates targeted replacement of the lens 22.

[0052] It is worth mentioning that, in the specific implementation, the surface of the bracket 23 is textured, and the entrance surface and the exit surface 222 of the lens 22 are polished. The entrance surface 221 is the surface close to the light-emitting element 21, and the exit surface 222 is the surface away from the light-emitting element 21.

[0053] Furthermore, the bracket 23 is detachably mounted on the mounting plate 1. This arrangement facilitates the subsequent maintenance and replacement of components, improving the assemblability of the lighting assembly 100. It is understood that this solution does not limit the specific implementation of the detachable mounting; it can employ screw and screw hole connections or magnetic connections.

[0054] For specific implementation details, please refer to [the relevant documentation / reference]. Figures 3 to 4 The following is a specific embodiment of lens 22 in this scheme. The light-incident surface 221 of lens 22, viewed from the light-exit surface 222, is circular. The light-exit surface 222, viewed from the light-exit surface 222, is a rounded rectangle, possessing a major axis and a minor axis. Let Lx represent the direction of the minor axis of lens 22, and Ly represent the direction of the major axis of lens 22. The major and minor axes are perpendicular to each other. The light-incident surface 221 of lens 22 is an inwardly concave parabolic surface of revolution. In the yz plane, the equation of the generatrix of the surface of revolution satisfies z1 = -0.075y1. 2 +1E-07y1+a, where a is a constant, -6.36mm≤y1≤6.36mm. See also... Figure 5 and Figure 6 The equation of the cross-sectional curve of the light-emitting surface 222 of lens 22 along the minor axis Lx satisfies z2=-0.0008x 4 -0.0003x 3 -0.0555x 2 -0.0088x+b, where b is a constant, -6.49mm≤x≤6.49mm. The equation of the cross-sectional curve of the light-emitting surface 222 of lens 22 along the major axis Ly direction satisfies z3=-0.0005y2. 4 -0.0001y2 3 -0.036y2 2 -0.0058y2+c, where c is a constant, -7.17mm≤y2≤7.17mm.

[0055] Please refer to Figure 7 The light-emitting elements 21 at both ends of the illumination assembly 100 emit illumination spots AB and A'B' on the target illumination surface, where A'B is the effective field of view area of ​​the long side of the lens, and this area is the overlapping area of ​​the illumination spots of all light-emitting elements 21. AA' and BB' are the transition parts of the illumination spots. The transition parts are relatively small in proportion to the effective field of view area, resulting in high light source utilization and high brightness of the target illumination surface.

[0056] Please refer to Figure 8Based on the light intensity distribution curves in the Lx and Ly directions, and combined with the selected lens material 22, the incident surface 221 and exit surface 222 curves of lens 22 were specifically optimized at a working distance of 1000mm for the illumination assembly 100. The optimization design refers to using optical simulation design software to create a correspondence between lens 22 and the light spot on the target illumination surface, based on the requirements for light spot shape and illuminance uniformity. The incident surface 221 and exit surface 222 curves of lens 22 were optimized to ensure that the light spot shape and illuminance uniformity met the requirements. As can be seen from the figure, the edge portion shows a significant brightness improvement compared to a Lambertian light source.

[0057] Please refer to Figure 9 At a working distance of 1000mm, the lighting component 100 provides uniform light distribution and good edge cutoff, with minimal light spillage outside the light spot, resulting in low light pollution. The light spot size can meet the requirement of uniform illumination within an effective field of view of 1200mm × 800mm, with an effective field of view illuminance uniformity greater than 0.85. This solves the technical problem of low light spot uniformity in existing technologies.

[0058] This utility model also proposes an optical recognition device, which includes the above-mentioned illumination component. Since the optical recognition device includes the illumination component, the specific structure of the illumination component is as described in the above embodiments. Since the illumination component of this optical recognition device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0059] In one embodiment of this utility model, the optical recognition device is set as a barcode reader. By setting the above-mentioned illumination component on the barcode reader, the lens of the barcode reader can clearly decode even under low light conditions. Furthermore, due to the high uniformity of the light spot on the target surface and the good edge cutoff, the decoding success rate is greatly improved and visual fatigue is reduced. At the same time, the illumination component has a simple structure, can be well assembled on the barcode reader, and has low processing difficulty.

[0060] The above are merely exemplary embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. An illumination assembly for supplementing light to an optical recognition device, characterized in that, include: The mounting plate has a light-transmitting area for the lens of the optical recognition device to recognize the image, and an illumination area is formed around the light-transmitting area; An illumination module is disposed in the illumination area. The illumination module includes multiple light-emitting elements and multiple lenses. The multiple light-emitting elements are arranged at intervals. Each lens covers the light-emitting element and is arranged in a one-to-one correspondence with the light-emitting element, so that the light-emitting element is located on the optical axis of the lens, and the optical power of each lens is positive.

2. The lighting assembly as claimed in claim 1, characterized in that, The lighting area is provided in multiple ways, and the multiple lighting areas are distributed at intervals along the circumferential direction; or... The lighting area is provided in two parts, and the light-transmitting area is located between the two lighting areas.

3. The lighting assembly as claimed in claim 1, characterized in that, The lighting area is provided in two places, the two lighting areas are spaced apart in a first direction, and the light-transmitting area is located between the two lighting areas; The lighting module is provided in two parts and is located in two lighting areas. Each lighting module includes a plurality of light-emitting groups spaced apart in a second direction. Each light-emitting group includes a plurality of light-emitting elements spaced apart in a first direction and a plurality of lenses correspondingly arranged therebetween.

4. The lighting assembly as claimed in claim 1, characterized in that, The lighting module also includes a bracket, which has multiple transmission areas, and the multiple transmission areas are arranged one-to-one with the multiple light-emitting elements. The plurality of lenses are respectively disposed in the plurality of the transmission regions.

5. The lighting assembly as claimed in claim 4, characterized in that, The multiple lenses and the bracket are integrally formed.

6. The lighting assembly as claimed in claim 4, characterized in that, The bracket is detachably mounted on the mounting plate.

7. The lighting assembly as claimed in claim 1, characterized in that, The light-incident surface of each lens is set as a concave surface, and the light-outceasing surface is set as a convex surface.

8. The lighting assembly as claimed in claim 1, characterized in that, The lens is configured as an optical glass lens, an acrylic lens, or a polycarbonate lens.

9. An optical recognition device, characterized in that, Includes the lighting assembly as described in any one of claims 1 to 8.

10. The optical recognition device as claimed in claim 9, characterized in that, The optical identification device includes a barcode reader.

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