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, including mounting plate and lighting unit, the mounting plate has spaced light-transmitting area and mounting area, the light-transmitting area is used to show the identification code to be identified, to supply the lens identification of optical identification device, the lighting unit includes light emitting part and lens, the light emitting part is located in the mounting area, the lens cover is set the light emitting part, the light entrance surface of the lens is curved surface setting, and it is convex to the direction away from the light emitting part, the center part of the light entrance surface of the lens is convex to the direction close to the light emitting part.The technical scheme provided by the utility model limits the structure of the light entrance surface of lens, thereby dispersing the light rays to the center, and gathering the light rays to the edge, so that uniform and good spot of cutoff can be generated.

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 reader illumination components produce light spots with unclear boundaries on the target illumination surface, with a large difference in brightness between the edge and the center, or even excessive scattering at the edge of the light spot. The poor cutoff of the light spot can easily cause glare for users, leading to visual fatigue during work and significantly impacting decoding performance. Utility Model Content

[0004] The main objective of this invention is to provide an illumination component and an optical recognition device, which aims to provide an illumination component capable of generating 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] A mounting plate having spaced light-transmitting areas and a mounting area, the light-transmitting areas being used to expose the identification code to be identified for recognition by the lens of an optical identification device; and,

[0007] The lighting unit includes a light-emitting element and a lens. The light-emitting element is located in the mounting area, and the lens covers the light-emitting element. The light-incident surface of the lens is curved and protrudes in a direction away from the light-emitting element. The central portion of the light-incident surface of the lens protrudes in a direction closer to the light-emitting element.

[0008] In one embodiment, the light-emitting surface of the lens is curved, and the edge portion of the light-emitting surface of the lens protrudes in a direction away from the light-emitting element.

[0009] In one embodiment, a plurality of lighting units are provided in the installation area, and the plurality of lighting units are arranged at intervals to form a lighting array. The lighting array includes a plurality of lighting groups spaced apart in a first direction, and each lighting group includes a plurality of lighting units spaced apart in a second direction. The plurality of lighting units in two adjacent lighting groups are staggered in the second direction.

[0010] In one embodiment, the installation area is provided with a plurality of spaced-apart installation slots;

[0011] The lighting unit is provided in multiple ways, and the multiple light-emitting elements are respectively disposed in multiple mounting slots, with the light-emitting surface of the lens exposed outside the mounting slot.

[0012] In one embodiment, multiple lighting units are provided;

[0013] The lighting assembly also includes a bracket, which is disposed on the mounting plate and covers the mounting area. The bracket has multiple mounting holes, and the multiple mounting holes are configured to correspond one-to-one with the multiple light-emitting elements.

[0014] The lenses are respectively embedded in the mounting holes, and the light-emitting surfaces of the lenses protrude from the side of the bracket facing away from the light-emitting element.

[0015] In one embodiment, the bracket is integrally disposed with the plurality of lenses.

[0016] In one embodiment, the end face of the mounting plate is recessed in the mounting area, and the bottom wall of the recess is provided with a plurality of mounting slots arranged at intervals for accommodating a plurality of light-emitting elements.

[0017] The bracket is detachably installed in the mounting area and extends into the groove.

[0018] In one embodiment, multiple installation areas are provided, which are arranged around the outside of the light-transmitting area and spaced apart along the circumferential direction. Each installation area is provided with at least one lighting unit; or,

[0019] There are two installation areas, which are located on opposite sides of the light-transmitting area in the first direction. Each installation area is provided with at least one lighting unit.

[0020] This utility model also proposes an optical recognition device, including the above-mentioned illumination component, wherein the illumination component includes:

[0021] A mounting plate having spaced light-transmitting areas and a mounting area, the light-transmitting areas being used to expose the identification code to be identified for recognition by the lens of an optical identification device; and,

[0022] The lighting unit includes a light-emitting element and a lens. The light-emitting element is located in the mounting area, and the lens covers the light-emitting element. The light-incident surface of the lens is curved and protrudes in a direction away from the light-emitting element. The central portion of the light-incident surface of the lens protrudes in a direction closer to the light-emitting element.

[0023] In one embodiment, the mounting plate is provided with clearance holes to form the light-transmitting area;

[0024] The optical identification device includes a barcode reader, the lens of which extends into the clearance hole.

[0025] The technical solution of this utility model, by placing the light-emitting element in the installation area, can supplement the lens light in the light-transmitting area. By setting a lens covering the light-emitting element, the light emitted by the light-emitting element can be shaped. Specifically, the light-incident surface of the lens is curved and protrudes away from the light-emitting element, while the central part of the light-incident surface of the lens protrudes closer to the light-emitting element. This arrangement allows the lens to deflect light rays incident on the center outward and light rays incident on the edges inward. This not only avoids excessive brightness at the center of the light spot but also prevents light leakage, thereby improving the uniformity of the light spot on the target illumination surface and ensuring good edge cutoff of the light spot. This improves the decoding success rate while reducing user visual fatigue, thus improving work efficiency. Attached Figure Description

[0026] 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.

[0027] Figure 1 A schematic diagram of the structure of an embodiment of the lighting component provided by this utility model;

[0028] Figure 2 for Figure 1 A schematic diagram of the structure of the light-emitting element, lens, and support;

[0029] Figure 3 for Figure 1 A partial perspective view of the light-emitting component, lens, and support.

[0030] Figure 4 for Figure 1 A schematic diagram of the light rays emitted by the central light-emitting component;

[0031] Figure 5 for Figure 1 Top view of the light-incident surface of the middle lens;

[0032] Figure 6 for Figure 1 Schematic diagram of the middle lens and support;

[0033] Figure 7 for Figure 1 A schematic diagram illustrating the effect of the light spot produced by the central lighting component;

[0034] Figure 8 A schematic diagram illustrating the effect of light spots produced by ordinary light beads;

[0035] Figure 9 for Figure 8 A schematic diagram of the brightness distribution of the light spot.

[0036] Explanation of icon numbers:

[0037] 100. Lighting assembly; 1. Mounting plate; 11. Light-transmitting area; 12. Mounting area; 13. Mounting slot; 14. Groove; 2. Lighting unit; 21. Light-emitting element; 22. Lens; 221. Light-incident surface; 222. Light-emitting surface; 23. Bracket.

[0038] 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

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Traditional reader illumination components typically use a cup-shaped reflective structure to form a light spot. The light spot produced on the target illumination surface has an unclear boundary, a large difference in brightness between the edge and the center, or even excessive scattering at the edge. The light spot has poor cutoff, which can easily cause glare for the user, leading to visual fatigue during work and significantly impacting decoding performance.

[0043] Therefore, the main objective of this invention is to provide a lighting component that produces a light spot with uniform illuminance and good cutoff performance.

[0044] Please refer to Figures 1 to 3 The illumination assembly 100 is used to supplement the light for the optical recognition device, and includes a mounting plate 1 and an illumination unit 2. The mounting plate 1 has a spaced light-transmitting area 11 and a mounting area 12. The light-transmitting area 11 is used to expose the identification code to be identified for recognition by the lens of the optical recognition device. The illumination unit 2 includes a light-emitting element 21 and a lens 22. The light-emitting element 21 is located in the mounting area 12. The lens 22 covers the light-emitting element 21. The light-incident surface 221 of the lens 22 is curved and protrudes in a direction away from the light-emitting element 21. The central portion of the light-incident surface 221 of the lens 22 protrudes in a direction close to the light-emitting element 21.

[0045] The technical solution of this utility model, by placing the light-emitting element 21 in the mounting area 12, can supplement the lens light in the light-transmitting area 11. By placing the lens 22 over the light-emitting element 21, the light emitted by the light-emitting element 21 can be shaped. Specifically, the light-incident surface 221 of the lens 22 is curved and protrudes in a direction away from the light-emitting element 21. The central part of the light-incident surface 221 of the lens 22 protrudes in a direction closer to the light-emitting element 21. With this arrangement, the lens 22 can deflect the light rays incident on the center outward and the light rays incident on the edge inward. This not only avoids excessive brightness at the center of the light spot but also prevents light leakage, thereby improving the uniformity of the light spot on the target illumination surface and ensuring good edge cutoff of the light spot. This improves the decoding success rate while reducing user visual fatigue, thus improving work efficiency.

[0046] It should be noted that this scheme mainly utilizes Snell's law formula: n1sinθ1=n2sinθ2. Here, n1 is the refractive index of the medium containing the incident ray, θ1 is the angle of incidence, n2 is the refractive index of the medium containing the refracted ray, and θ2 is the angle of refraction. When light enters the lens from air, because the refractive index of the lens material is relatively high (n2>n1), according to the above formula, θ2<θ1 can be derived. Therefore, the refracted ray is closer to the normal. By convexizing the incident surface 221 of lens 22 towards the direction away from the light-emitting element 21, and convexizing the central part of the incident surface 221 of lens 22 towards the direction closer to the light-emitting element 21, lens 22 can converge light rays that diverge at large angles at the edges and diverge light rays that should be refracted inwards (please refer to...). Figure 4 This solves the problem of excessively high brightness at the center of the light spot and excessively low brightness at the edge, thus improving the uniformity of the light spot.

[0047] It should also be noted that, please refer to Figure 5 The central part of the light-incident surface 221 refers to the small circular area within the light-incident surface 221 and concentric with it.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] To further improve the brightness at the edge of the light spot, please refer to... Figure 3The light-emitting surface 222 of lens 22 is curved, and the edge of the light-emitting surface 222 of lens 22 protrudes away from the light-emitting element. When light enters the air from lens 22, due to the high refractive index of the material of lens 22 (n1 > n2), it can be deduced from the above formula that θ1 < θ2. Therefore, the refracted light is further away from the normal. By making the edge of the light-emitting surface 222 of lens 22 protrude away from the light-emitting element 21, the divergence angle of the light is directed towards a more peripheral position, thereby solving the problem of low brightness at the edge of the light spot and further improving the uniformity of the light spot.

[0052] For specific implementation details, please refer to [the relevant documentation / reference]. Figure 3 and Figure 7 In order to achieve the effect of a rectangular light spot, the four corners of the light-emitting surface 222 of the lens 22 are raised to fill in the dark areas at the four corners of the light spot, thus forming a rectangular light spot with uniform brightness.

[0053] It is worth mentioning that the light-incident surface 221 and the light-exit surface 222 of lens 22 have a columnar structure. The sidewalls of this columnar structure can reflect the light inside lens 22, thereby initially limiting the divergence range of the light and preventing light leakage. In specific implementations, the sidewalls of lens 22 are textured to form a frosted surface or coated with a reflective film to reduce the refraction of light to the outside and reduce light waste.

[0054] It should also be noted that this solution does not limit the number or arrangement of the installation areas 12. In one embodiment of this solution, multiple installation areas 12 are provided, which are arranged around the outside of the light-transmitting area 11 and distributed at intervals along the circumferential direction. Each installation area 12 is provided with at least one lighting unit 2. With this arrangement, the light spots generated by the lighting units 2 in each installation area 12 are superimposed on the corresponding positions in the central light-transmitting area 11, thereby ensuring the illumination brightness at the target illumination surface and further improving the uniformity of the illumination spot. In another embodiment of this solution, two installation areas 12 are provided, which are respectively arranged on both sides of the light-transmitting area 11 in the first direction. Each installation area 12 is provided with at least one lighting unit 2. This arrangement has a simple structure, is easy to deploy, and can meet the illumination requirements of most optical recognition devices.

[0055] It is understood that this solution does not limit the number and arrangement of lighting units 2 in installation area 12. In one embodiment of this solution, please refer to... Figure 1Multiple lighting units 2 are arranged in the installation area 12, forming an lighting array. The lighting array includes multiple lighting groups spaced apart in a first direction, and each lighting group includes multiple lighting units 2 spaced apart in a second direction. The lighting units 2 in adjacent lighting groups are staggered in the second direction. This arrangement allows the light spots formed by the individual lighting units 2 to overlap, compensating for the uneven brightness caused by gaps between the lighting units 2. In another embodiment of this solution, the arrangement of the lighting units 2 in each lighting group is identical. This arrangement distributes the lighting units 2 in a rectangular array within the installation area 12, facilitating the formation of rectangular light spots, thus adapting well to the shape of most identification codes.

[0056] To avoid crosstalk between light emitted by different light-emitting elements 21, please refer to... Figure 1 The mounting area 12 has multiple spaced mounting slots 13, and multiple lighting units 2 are provided. Multiple light-emitting elements 21 are correspondingly installed within the multiple mounting slots 13, and the light-emitting surface 222 of the lens 22 is exposed outside the mounting slots 13. This arrangement isolates each light-emitting element 21 from the others, making each element independent and avoiding light crosstalk. At the same time, the mounting slots 13 facilitate the installation of the light-emitting elements 21 and the lens 22, improving the assemblability of the structure.

[0057] When multiple lighting components 100 are provided, please refer to the following for easy assembly of multiple lenses 22: Figure 6 In one embodiment of this utility model, the lighting assembly 100 further includes a bracket 23, which is mounted on the mounting plate 1 and covers the mounting area 12. The bracket 23 has multiple mounting holes, each corresponding to a plurality of light-emitting elements 21. Multiple lenses 22 are respectively embedded in the multiple mounting holes, and the light-emitting surface 222 of the lens 22 protrudes from the side of the bracket 23 facing away from the light-emitting elements 21. With this configuration, in the actual assembly process, by directly placing the lenses 22 in the corresponding mounting holes and then assembling the bracket 23 onto the mounting plate 1, the assembly difficulty is greatly reduced. Compared to assembling each lens 22 onto the light-emitting elements 21 one by one, this saves considerable working time and improves work efficiency.

[0058] Of course, this solution does not limit the specific implementation of the lens 22 on the bracket 23. In a preferred embodiment, the bracket 23 and the multiple lenses 22 are integrally formed, that is, the lenses 22 and the bracket 23 are manufactured by integral molding. 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 can reduce the openings in the overall structure and make the overall structure more stable.

[0059] Furthermore, the end face of the mounting plate 1 is recessed in the mounting area 12 with a groove 14. The bottom wall of the groove 14 is provided with multiple spaced mounting slots 13 for accommodating multiple light-emitting elements 21. The bracket 23 is detachably mounted in the mounting area 12 and extends into the groove 14. This arrangement facilitates subsequent maintenance and replacement of components and improves the assemblability of the lighting assembly 100. It is understood that this solution does not limit the specific implementation of detachable installation; it can use screw and screw hole engagement or snap-fit ​​and slot engagement.

[0060] It should be noted that, in order to further avoid the problem of light crosstalk, the inner wall of the mounting groove 13 is textured to form a frosted structure, thereby eliminating the large-angle light generated by the reflection of the inner surface of the mounting groove 13. At the same time, the bracket 23 is made of black plastic, so that each lens 22 is independent and avoids light crosstalk between different lighting units 2.

[0061] Please refer to Figures 7 to 9 , Figure 7 This is a schematic diagram illustrating the effect of the light spot produced by the lighting component 100. Figure 8 This is a schematic diagram illustrating the effect of light spots produced by ordinary light beads. Figure 9 for Figure 8 The above image shows a schematic diagram of the brightness distribution of the light spot. As can be seen from the image, the light spot produced by the illumination component 100 in this solution has higher uniformity, better edge cutoff, and is rectangular in shape, which can be well adapted to the shape of most identification codes.

[0062] This utility model also proposes an optical recognition device, which includes the above-mentioned illumination component 100. Since the optical recognition device includes the illumination component 100, the specific structure of the illumination component 100 is as described in the above embodiments. Since the illumination component 100 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.

[0063] In one embodiment of this utility model, the mounting plate 1 is provided with a clearance hole to form a light-transmitting area 11. The optical identification device includes a barcode reader, and the lens of the barcode reader extends into the clearance hole. By setting the above-mentioned illumination component 100 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 100 has a simple structure, can be well assembled on the barcode reader, and has low processing difficulty.

[0064] 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 spaced light-transmitting areas and mounting areas, wherein the light-transmitting areas are used to expose the identification code to be identified for recognition by the lens of the optical identification device. as well as, The lighting unit includes a light-emitting element and a lens. The light-emitting element is located in the mounting area, and the lens covers the light-emitting element. The light-incident surface of the lens is curved and protrudes in a direction away from the light-emitting element. The central portion of the light-incident surface of the lens protrudes in a direction closer to the light-emitting element.

2. The lighting assembly as claimed in claim 1, characterized in that, The light-emitting surface of the lens is curved, and the edge of the light-emitting surface of the lens protrudes away from the light-emitting element.

3. The lighting assembly as claimed in claim 1, characterized in that, The installation area is provided with a plurality of lighting units, which are arranged at intervals to form a lighting array. The lighting array includes a plurality of lighting groups spaced apart in a first direction. Each lighting group includes a plurality of lighting units spaced apart in a second direction. The lighting units in two adjacent lighting groups are staggered in the second direction.

4. The lighting assembly as claimed in claim 1, characterized in that, The installation area is provided with multiple spaced-apart installation slots; The lighting unit is provided in multiple ways, and the multiple light-emitting elements are respectively disposed in the multiple mounting slots, and the light-emitting surface of the lens is exposed outside the mounting slot.

5. The lighting assembly as claimed in claim 1, characterized in that, Multiple lighting units are provided; The lighting assembly also includes a bracket, which is disposed on the mounting plate and covers the mounting area. The bracket has multiple mounting holes, and the multiple mounting holes are configured to correspond one-to-one with the multiple light-emitting elements. The lenses are respectively embedded in the mounting holes, and the light-emitting surfaces of the lenses protrude from the side of the bracket facing away from the light-emitting element.

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

7. The lighting assembly as claimed in claim 5, characterized in that, The end face of the mounting plate is recessed in the mounting area, and the bottom wall of the recess is provided with a plurality of mounting slots arranged at intervals for mounting a plurality of light-emitting components. The bracket is detachably installed in the mounting area and extends into the groove.

8. The lighting assembly as claimed in claim 1, characterized in that, Multiple installation areas are provided, which are arranged around the outside of the light-transmitting area and spaced apart along the circumference. Each installation area is provided with at least one lighting unit; or... There are two installation areas, which are located on opposite sides of the light-transmitting area in the first direction. Each installation area is provided with at least one lighting unit.

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 mounting plate is provided with clearance holes to form the light-transmitting area; The optical identification device includes a barcode reader, the lens of which extends into the clearance hole.

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