Curing light source

Abstract

The utility model discloses a curing light source which comprises a substrate, a plurality of light-emitting chips are arranged on one side face of the substrate at intervals, the light-emitting chips are electrically connected with a power source, a lens set is arranged at the top of each light-emitting chip in a clearance mode, the curing light source further comprises a baffle arranged at the top of the lens set, and the baffle is provided with an opening. The light emitted by the light-emitting chip is refracted by the lens group to form a light-emitting range of 39-40 degrees, and the light source is mainly provided with the baffle plate above the lens to form a specific light-emitting range, so that the illumination uniformity of the curing light source at the irradiation distance of 40mm is improved, particularly, light spots at corners can be in smooth transition, and the illumination uniformity reaches more than 90%.

Description

Technical Field

[0001] The utility model relates to the technical field of UV light curing equipment, and more specifically, to a curing light source. Background Art

[0002] UV glue is often used in the microelectronics industry, PCB industry, optical communication industry, medical device manufacturing and other related fields. In these related fields, many parts need to be processed by UV glue. Since UV glue is a UV curing glue, it needs to be cured by ultraviolet irradiation.

[0003] Most of the curing light sources in the prior art are in the shape of a square or a U-shaped shape, in order to obtain uniform irradiation and curing effects. However, in practice, it is found that these square or U-shaped curing light sources have the problem of uneven light paths. Further research found that this is mainly caused by insufficient light power density at the four corners of the curing light source. The reason is that the light emitted by the lamp beads at the four corners is refracted by the lens and gathered in the middle of the corner, which ultimately makes the uniformity of the radiation illumination of the curing light source very low, with high brightness in the middle and low brightness at the corners. The experimental results show that the irradiation uniformity of common square or U-shaped curing light sources at 40mm is less than 70%, while the common demand in the industry is 90% or higher. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects of the existing U-shaped or U-shaped curing light source with uneven light path and low illumination uniformity, and to provide a curing light source. By arranging a shielding component on the top of the lens to form a specific light output angle, the illumination uniformity of the curing light source is improved to eliminate the above defects.

[0005] The technical solution adopted by the utility model is: a curing light source, including a substrate, a plurality of light-emitting chips are arranged at intervals on one side of the substrate, the light-emitting chips are electrically connected to a power supply, a lens group is arranged in the gap at the top of the light-emitting chip, and in addition, a baffle is arranged on the top of the lens group, and the baffle is provided with an opening, so that the light emitted by the light-emitting chip forms a light output range of 38-42° after being refracted by the lens.

[0006] Furthermore, the spacing distance between the upper surface of the light-emitting chip and the lower surface of the lens is 0.5-2 mm, and preferably, the spacing distance is 1 mm.

[0007] Furthermore, the light emitting chips are distributed in a square shape, and the interval between two adjacent light emitting chips is kmm, where k is any integer between 2-10, and the specific k value can be adjusted according to the size of the actual curing light source and the number of light emitting chips.

[0008] Furthermore, the lens group is composed of a plurality of lenses, and the lenses correspond to the light-emitting chips one by one, wherein the aspect ratio of a single lens is 1:1.

[0009] Furthermore, the length and width of a single lens are both kmm, and the size of a single lens is associated with the spacing setting of the light-emitting chips, the purpose of which is to ensure that there is no gap between the lenses, so that they can be closely arranged to avoid light leakage.

[0010] Furthermore, the lens group is a compound eye lens in which a plurality of lenses are arranged in a square shape, and a single lens extends away from the substrate on one side to form an outwardly convex arc surface, similar to a convex lens, which can achieve a light-gathering effect, so that the light originally scattered by the light-emitting chip can be gathered at a set angle, thereby increasing the light intensity of the irradiation area. The compound eye lens can achieve high light energy utilization and uniform illumination over a large area.

[0011] Furthermore, the lens group is a detachable structure, which is composed of four strip lens groups connected end to end. The lens can be an integrally formed square-shaped lens group, or it can be split into four sides for assembly, which can be formulated according to actual needs.

[0012] Furthermore, the material of the lens group is polymethyl methacrylate (PMMA), which is a high molecular polymer, also known as acrylic or organic glass, which has the characteristics of easy processing, low density and high light transmittance, and is suitable for the lens material of the utility model.

[0013] Furthermore, it also includes an internal fixing component and an external fixing component, and there is a mounting cavity between the internal fixing component and the external fixing component, the light-emitting chip and the lens group are located in the mounting cavity, and the baffle is arranged on the top surface of the internal fixing component and the external fixing component.

[0014] Furthermore, the lens group is detachably connected to the inner fixing component and the outer fixing component, thereby ensuring that the positions of a single lens and a single light-emitting chip correspond one to one, thereby achieving the best light-emitting effect.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model re-emphasizes the setting of the baffle above the lens to form a specific light output range, so that the light uniformity of the curing light source at an irradiation distance of 40mm is improved, especially the light spot at the corner can transition smoothly, and the light uniformity reaches more than 90%;

[0017] 2. The use of multiple lenses interconnected in one piece makes it easier to increase the spacing between the light-emitting chips, effectively avoiding excessive heat concentration on the chips, facilitating heat dissipation, improving light-emitting reliability and effectiveness, and extending the service life of the light-emitting chips;

[0018] 3. In order to overcome the problem of difficult installation of curing light sources in the prior art, the utility model sets a fixing component on the top surface of the substrate, and connects the lens to the fixing component to ensure the stability of the relative position of the lens and facilitate installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is an exploded view of the utility model;

[0021] Figure 3 for Figure 1 Section view at AA.

[0022] In the attached figure:

[0023] 1-substrate; 2-light-emitting chip; 3-lens; 4-baffle; 5-internal fixing component; 6-external fixing component. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0025] The same or similar reference numerals in the drawings of the embodiments of the present utility model correspond to the same or similar parts; in the description of the present utility model, it should be understood that if the terms "front", "rear", "left", "right" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for exemplary explanations and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances. In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features.

[0026] Embodiment 1

[0027] like Figure 1 , Figure 2 and Figure 3As shown, this embodiment provides a curing light source, including a square-shaped substrate 1, one side of the substrate 1 is provided with a plurality of light-emitting chips 2, and the other side is provided with a circuit structure and a heat dissipation structure, and the circuit structure is used to supply power to the light-emitting chip 2. The circuit structure and the heat dissipation structure are covered by the outer shell of the curing light source (not shown in the figure), the circuit structure is electrically connected to the power supply through a wiring harness, and the heat dissipation structure is connected to the outside through an air supply pipeline, so that the low-temperature gas in the environment or the gas source is passed into the curing light source. The circuit structure and the heat dissipation structure are commonly used or general structures in the field, and will not be elaborated here. The light-emitting chips 2 are arranged at intervals, and are attached to the substrate 1 by COB (Chip-On-Board, i.e., chip on board packaging). The specific number of the light-emitting chips 2 is adjusted according to the output power of the curing light source. In this embodiment, the number of the light-emitting chips 2 is 88, specifically, 30 are arranged on the long side of the substrate 1, and 14 are arranged on the short side of the substrate 1. A lens group is arranged in the top gap of the light-emitting chip 2 to focus the light emitted by the light-emitting chip 2. In addition, in order to improve the uniformity of lighting, the present curing light source is also provided with a baffle 4 on the top of the lens group, and the baffle 4 leaves an opening on the top of the lens group, so that the light emitted by the light-emitting chip 2 forms a light output range of 39.5°±0.5° after being refracted by the lens group, that is, the light output range is 39-40°.

[0028] In some other embodiments, the light output range can be adjusted to 38-42° according to the application scenario. That is to say, under the premise of a tolerance of ±0.5°, the light output angle can be any value among 38.5°, 39.5°, 40.5°, 41.5°, or any angle value within the above numerical range.

[0029] In this embodiment, the spacing distance between the upper surface of the light emitting chip 2 and the lower surface of the lens group is 1 mm. Of course, in other embodiments, the spacing distance can be adjusted within the range of 0.5-2 mm according to the output power of the curing light source and the output power of a single light emitting chip 2.

[0030] In this embodiment, the arrangement shape of the light emitting chips 2 is the same as that of the substrate 1, and is distributed in a square shape, and the spacing between two adjacent light emitting chips 2 is 5 mm. Of course, in other embodiments, the spacing can be adjusted according to the output power of the curing light source and the output power of a single light emitting chip 2, and the spacing k can be set to any integer between 2-10 mm.

[0031] In this embodiment, the power source is an external power source, that is, it is directly electrically connected to the socket through a plug (wiring harness). The advantage of this is that no built-in battery is required, and the overall volume of the curing light source can be further reduced. Of course, in other embodiments, the curing light source is also provided with a rechargeable power source (not shown in the figure), which is arranged in the housing at the bottom of the curing light source, and the light emitting chip 2 is electrically connected to the rechargeable power source through the circuit structure. The rechargeable power source provides power to the light emitting chip 2. The rechargeable power source is selected to facilitate the use of the curing light source in a mobile state and increase the convenience of use.

[0032] The specification of the single light emitting chip 2 is 42×42mil (mil, i.e. one thousandth of an inch, approximately equal to 0.0254mm), the power is 1500mW under the condition of 1A current, and the wavelength of the emitted light is 470-475nm. Under the above assembly dimensions, the width of the annular light spot generated by the curing light source described in this embodiment at an irradiation distance of 40mm is 8mm, and the light spot at the corner has the characteristic of smooth transition.

[0033] Comparative Example 1:

[0034] A ring-shaped substrate 1 is used, and 134 light-emitting chips 2 are distributed in a square shape on the substrate 1. A single light-emitting chip 2 is a U325A4V133Z1 lamp bead, and the input current is 900mA. In the comparative example 1, the spacing between two adjacent light-emitting chips 2 is 4.55mm (on the long side of the substrate 1), 4.8mm (on the short side of the substrate 1) and 2.85mm (at the corner of the substrate 1) (the above spacing is the distance from the center of the light-emitting chip 2 to the center of the adjacent light-emitting chip 2).

[0035] Comparative Example 2:

[0036] A ring-shaped substrate 1 is used, and 112 light-emitting chips 2 are distributed in a square shape on the substrate 1. A single light-emitting chip 2 is a U525A4V133Z1A2 lamp bead, and the input current is 900mA. In comparative example 2, the spacing between two adjacent light-emitting chips 2 is 4.55mm (on the long side of the substrate 1), 4.55mm (on the short side of the substrate 1), 2.85mm (on the long side of the substrate 1 near the corner) and 3.0mm (on the short side of the substrate 1 near the corner) (the above spacing is the distance from the center of the light-emitting chip 2 to the center of the adjacent light-emitting chip 2).

[0037] Comparative Example 3:

[0038] A ring-shaped substrate 1 is used, and 100 light-emitting chips 2 are distributed in a square shape on the substrate 1, and each light-emitting chip 2 is a U325AGTV63Z1 lamp bead. The difference from the comparative example 1 is that the chamfer R of the lens 3 of the comparative example 3 is adjusted to 11 mm.

[0039] Comparative Example 4:

[0040] A ring-shaped substrate 1 is used, and 116 light-emitting chips 2 are distributed in a square shape on the substrate 1, and each light-emitting chip 2 is a U325AGTV63Z1 lamp bead. The difference from the comparative example 3 is that the chamfer R of the lens 3 of the comparative example 4 is adjusted to 13 mm.

[0041] The simulation results of Example 1 and Comparative Examples 1 to 4 are shown in the following table.

[0042] Table 1 Lamp bead simulation results

[0043]

[0044] It can be concluded from the above table that the structure of the curing light source described in this embodiment can make the uniformity of the radiant illumination of the refracted light at 40mm reach more than 90%, and can reach 93% in the simulation experiment, while the uniformity of the radiant illumination of other control examples is less than 90%. This embodiment has achieved an improvement in the uniformity of radiant illumination, and has a wider application scenario and practical significance.

[0045] Embodiment 2

[0046] like Figure 2 as well as Figure 3 As shown, this embodiment provides another curing light source, including a substrate 1, a plurality of light-emitting chips 2 are arranged on the top surface of the substrate 1, a lens group is arranged in the top gap of the light-emitting chip 2, and a baffle 4 is also arranged on the top of the lens group. The baffle 4 is provided with an opening, so that the light emitted by the light-emitting chip 2 forms a light-emitting range of 38-42° after being refracted by the lens 3. Different from the first embodiment, the lens group described in this embodiment is a compound eye lens in which a plurality of lenses 3 are arranged in a U-shaped shape, which is an integrally formed U-shaped lens group. The compound eye lens is composed of a plurality of single lenses 3 connected to each other as a whole, and each single lens 3 is respectively covered on a light-emitting chip 2, and each light-emitting chip 2 adjusts the angle of the emitted light through the corresponding single lens 3 to obtain high light energy utilization and uniform illumination over a large area.

[0047] Furthermore, the spacing between two adjacent light-emitting chips 2 is 5 mm, and each light-emitting chip 2 is arranged on the central axis of the corresponding lens 3. The predetermined distance between the light-emitting chips 2 is larger than the distance between the traditional chips, because in order to reduce the size of the large lens, the chips are arranged as close as possible, and the spacing is very small (as described in the above comparative example 1), resulting in an increase in the number of light-emitting chips 2 and insufficient heat dissipation. The substrate 1 described in this embodiment can be the same size as the existing substrate, but the light-emitting chips 2 are more dispersed. On this basis, the aspect ratio of a single lens 3 is 1:1, and the side of the single lens 3 away from the substrate 1 extends to form a convex curved surface, similar to a convex lens, which can achieve a focusing effect. Since the side extends outward to form a convex curved surface, the light beam will be refracted when passing through the convex curved surface, so that the emitted light beam is concentrated and the brightness is high. It was measured in the experiment that the curved surface enables the light originally scattered by the light-emitting chip 2 to be concentrated at a set angle, thereby increasing the light irradiation intensity of the irradiated area. In this embodiment, the length and width of a single lens 3 are both 5 mm, which is the same as the distance between two adjacent light-emitting chips 2. The purpose is to ensure that there is no gap between the single lenses 3, so that the lenses 3 can be closely arranged to avoid light leakage.

[0048] In some other embodiments, when the interval between two adjacent light-emitting chips 2 is adjusted, the length and width of a single lens 3 are also adjusted accordingly.

[0049] The material of the lens group is polymethyl methacrylate (PMMA), which is a high molecular polymer also known as acrylic or organic glass. It has the characteristics of easy processing, low density and high light transmittance, and is suitable for the lens group material of this embodiment.

[0050] Embodiment 3

[0051] like Figure 2 or Figure 3 As shown, on the basis of the second embodiment, in this embodiment, the lens group is a detachable structure, which is composed of four strip lens groups connected end to end. At the same time, in order to limit the relative position of the lens group and the light-emitting chip 2, this embodiment also provides an internal fixing component 5 and an external fixing component 6. The internal fixing component 5 and the external fixing component 6 are connected to the outer shell of the curing light source, and a gap is set between the internal fixing component 5 and the external fixing component 6. The gap is an installation cavity existing between the internal fixing component 5 and the external fixing component 6, and the light-emitting chip 2 and the lens group are both arranged in the installation cavity. The baffle 4 is fixedly arranged on the top surface of the internal fixing component 5 and the external fixing component 6.

[0052] Of course, in some other embodiments, the inner fixing component 5 and the outer fixing component 6 can also serve as the outer shell of the curing light source at the same time.

[0053] The existing curing light source is difficult to install, mainly because there is no fixed connection structure between the lens and the structural member, which makes it difficult to install the lens in a position parallel to the lamp bead module. The lens is prone to tilt and the installation accuracy is low, which affects the irradiation effect of UV light. This embodiment improves this problem, see Figure 3 Specifically, the inner fixing component 5 and the outer fixing component 6 are provided with a first clamping structure on opposite sides, and the second clamping structure connected to the first clamping structure is provided on both sides of the lens group. The lens group is fixed by the cooperation of the first clamping structure and the second clamping structure, so that the relative position of the lens group and the light-emitting chip 2 does not change, and the lens group is installed in a position parallel to the light-emitting chip 2, which is not easy to tilt, improves the installation accuracy, and does not shake between the two, so as to ensure that the light beam of the light-emitting chip 2 can be emitted through the curved surface of the lens 3, and will not be emitted from the side of the base of the lens 3, thereby ensuring the focusing rate of the lens group. The first clamping structure and the second clamping structure are detachable connection structures, which can be buckles, slots, etc.

[0054] In some other embodiments, the top width of the mounting cavity formed by the internal fixing component 5 and the external fixing component 6 is greater than the bottom width, that is, the side of the mounting cavity forms a slope (not shown in the figure) to serve as a guide for the engagement of the lens group with the internal fixing component 5 and the external fixing component 6, thereby ensuring smooth engagement of the lens 3 with the internal fixing component 5 and the external fixing component 6.

[0055] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features 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.

[0056] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A curing light source, comprising a substrate (1), a plurality of light-emitting chips (2) are arranged at intervals on one side of the substrate (1), the light-emitting chips (2) are electrically connected to a power source, and a lens group is arranged in the gaps at the tops of the light-emitting chips (2). It is characterized in that A baffle (4) is also provided on the top of the lens group, and the baffle (4) is provided with an opening, so that the light emitted by the light-emitting chip (2) forms a light output range of 38-42° after being refracted by the lens group.

2. The curing light source according to claim 1, It is characterized in that The spacing distance between the upper surface of the light-emitting chip (2) and the lower surface of the lens group is 0.5-2 mm.

3. The curing light source according to claim 1 or 2, It is characterized in that The light-emitting chips (2) are distributed in a square shape, and the spacing distance between two adjacent light-emitting chips (2) is kmm, where k is any integer between 2 and 10.

4. The curing light source according to claim 3, It is characterized in that The lens group is composed of a plurality of lenses (3), the lenses (3) correspond to the light-emitting chips (2) one by one, wherein the aspect ratio of a single lens (3) is 1:

1.

5. The curing light source according to claim 4, It is characterized in that The length and width of a single lens (3) are both kmm.

6. The curing light source according to claim 4, It is characterized in that The lens group is a compound eye lens with a U-shaped arrangement structure, and a single lens (3) extends on a side away from the substrate (1) to form an outwardly convex arc surface.

7. The curing light source according to claim 6, It is characterized in that The lens group is a detachable structure, which is composed of four strip lens groups connected end to end.

8. The curing light source according to any one of claims 4 to 7, It is characterized in that The material of the lens group is polymethyl methacrylate.

9. The curing light source according to claim 1, It is characterized in that It also includes an internal fixing component (5) and an external fixing component (6), and there is a mounting cavity between the internal fixing component (5) and the external fixing component (6), the light-emitting chip (2) and the lens group are located in the mounting cavity, and the baffle (4) is arranged on the top surface of the internal fixing component (5) and the external fixing component (6).

10. The curing light source according to claim 9, It is characterized in that The lens group is detachably connected to the internal fixing component (5) and the external fixing component (6).

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