Light emitting device

Abstract

The utility model provides a kind of light emitting device, it includes at least one circuit board and the LED placed on it;A shell, include four long side and two short sides, four long side each other abutment forms a cavity, and is equipped with light outlet in at least one long side portion;Two short sides are respectively located at the opposite end of cavity, wherein at least one short side portion has opening, for corresponding LED on circuit board, so that light can be injected via the short side opening;A light guide strip is arranged in the cavity, it has light entrance surface and light exit surface, wherein the light entrance surface corresponds the short side opening, the light exit surface is adjacent to the light entrance surface and corresponds the light outlet. Through this configuration, the light emitted by LED can be introduced into the light guide strip through the short side opening, and emitted from the light exit surface of the light guide strip, and then form uniform light distribution through the light outlet of the shell, improve the uniformity of overall light emission.

Description

Technical Field

[0001] This invention relates to the field of optical device technology, and in particular to a light-emitting device. Background Technology

[0002] Light guide structures have extremely wide applications in optical devices and electronic products. Their main function is to effectively guide the light emitted by a light source to a specific direction, further improving the uniformity of light distribution and luminous efficiency. Examples of light guide structure applications can be found in general daily lighting, backlight modules of display devices, various sign lights, and indicator lights in electronic devices. However, the light emission effect required by the light guide structure varies depending on the application. In some special applications, such as image scanning illumination and linear detection, a uniform and continuous strip of light emission is often required. However, existing technologies in such strip-shaped light emission applications generally still face problems such as uneven light distribution, resulting in limited overall optical performance. Therefore, the market demand for strip-shaped light-emitting devices that can balance optical performance and light emission uniformity is increasingly urgent.

[0003] In view of the above situation, the applicant of this utility model, with years of professional experience in related research and development fields, has conceived and proposed a light-emitting device to improve the shortcomings of the existing technology and provide an optical device that meets market demand. Utility Model Content

[0004] One objective of this invention is to provide a light-emitting device that, through a combination design of a housing, light guide strip, and LED circuit board with a specific structural configuration, effectively improves the uneven light distribution problem commonly found in long strip-shaped light-emitting devices and enhances the overall light-emitting quality.

[0005] To achieve the above objectives, this utility model discloses a light-emitting device in one embodiment, comprising: at least one circuit board having an LED; a housing having an elongated structure with four long sides and two short sides, the four long sides being adjacent to each other to form a cavity, each of the long sides having a light-emitting port; the two short sides being respectively located at opposite ends of the cavity, at least one of the short sides having an opening; the circuit board being disposed corresponding to the short side and the LED being housed in the opening; and a light guide strip disposed in the cavity and having at least one light-incident surface and one light-emitting surface, the light-incident surface corresponding to the short side with the opening, and the light-emitting surface being adjacent to the light-incident surface and corresponding to the light-emitting port; thereby, the light emitted by the LED enters the light guide strip through the opening and exits through the light-emitting surface, forming uniform light emission through the light-emitting port. This effectively improves the problem of uneven light distribution, making the overall light emission effect more uniform and stable, while also having the advantages of simplified structure and ease of production.

[0006] In another embodiment, the LED is disclosed as a UV LED, the housing is made of a short-wave reflective material, and the light guide is made of a UV-resistant material. Accordingly, the light-emitting device is suitable for applications providing ultraviolet light emission and effectively mitigates the impact of ultraviolet light characteristics on the device's lifespan and light emission performance.

[0007] Furthermore, in one embodiment, the light guide strip has a side surface adjacent to the light incident surface, and the side surface has at least one groove, which is located at one end of the side surface near the light incident surface. The groove allows for light adjustment, thereby improving the uniformity of the emitted light.

[0008] Furthermore, in another embodiment, the groove is disclosed to be a V-shaped structure, which has excellent light guiding effect.

[0009] Based on the foregoing embodiments, in one embodiment, a protruding rib is provided on any of the long sides of the housing corresponding to the groove, and the protruding rib is used to combine with the groove. With the protruding rib, the groove can better perform positioning and assembly functions, thereby improving assembly convenience and structural stability.

[0010] Furthermore, in another embodiment, the ribs and the grooves are V-shaped structures to provide better structural assembly stability and dimming effect.

[0011] In yet another embodiment, the groove is an elongated structure, and the extension direction of the groove is transverse to the extension direction of any of the long sides of the housing. This effectively improves the uniformity of light distribution on the light-emitting surface and facilitates easier and faster assembly and installation when combined with the ribs.

[0012] In another embodiment, two circuit boards are disclosed, each of the two short sides of the housing has an opening, and the light guide strip has two opposing light-incident surfaces. This effectively improves overall brightness and enhances light emission uniformity.

[0013] In summary, the light-emitting device of this invention, through the coordinated design of the housing, LED light source, and light guide strip, allows light to enter the light guide strip from the short side of the housing in a side-entry manner, and then be uniformly emitted from the light-emitting surface of the light guide strip before being released through the light-emitting port on the long side of the housing, effectively improving the overall uniformity of light emission. Furthermore, this invention also proposes many additional optional detailed technical features, the specific technical details of which are described in the preceding paragraphs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the light-emitting device according to one embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the planar structure of a light-emitting device according to one embodiment of the present invention.

[0016] Figure 3 This is a schematic diagram of the light-emitting device structure according to another embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the light guide strip and housing structure of a light-emitting device according to another embodiment of the present invention. Detailed Implementation

[0018] As mentioned above, existing elongated light guide devices still have shortcomings in terms of uniform light distribution. Therefore, the applicant of this utility model has conceived and proposed an elongated light-emitting device that can achieve uniform light output. The following will provide a detailed description of this utility model with accompanying drawings. The structural dimensions, proportions, shapes, or application states shown in the figures are merely illustrative and used to illustrate the technical features of this utility model, and do not represent actual design limitations.

[0019] Please see Figure 1 and Figure 2 This is a schematic diagram and a planar structural diagram of a light-emitting device according to an embodiment of the present invention. The present invention discloses a light-emitting device 1, which includes at least one circuit board 10, a housing 11, and a light guide strip 12. The circuit board 10 has an LED 101. The housing 11 has an elongated structure with four long sides 111 and two short sides 112. The four long sides 111 are arranged adjacent to each other to form a cavity 113. Each long side 111 has a light outlet 1111. The two short sides 112 are respectively located at opposite ends of the cavity 113, and at least one short side 112 has an opening 1121. The circuit board 10 is positioned corresponding to the short sides 112, and the LED 101 is accommodated in the opening 1121.

[0020] The light guide strip 12 is disposed in the cavity 113 and has at least one light-incident surface 121 and one light-exiting surface 122. The light-incident surface 121 corresponds to the short side portion 112 with an opening 1121, and the light-exiting surface 122 is adjacent to the light-incident surface 121 and corresponds to the light-exit port 1111. Thus, the light emitted by the LED 101 enters the light guide strip 12 through the opening 1121 from the light-incident surface 121, and is emitted from the light-exit surface 122, forming uniform light emission through the light-exit port 1111.

[0021] The light-emitting device 1 effectively improves the uneven light distribution problem commonly found in traditional elongated light-emitting modules, making the overall light output more uniform, stable, and consistent. Furthermore, the structure, through the coordinated design of the housing 11 and the light guide strip 12, not only simplifies component composition and module configuration but also helps reduce manufacturing and assembly costs, thereby improving production efficiency.

[0022] In one application example, LED 101 can be a UV LED, housing 11 is made of a short-wave reflective material, and light guide 12 is made of a UV-resistant material. In this way, the light-emitting device 1 can be used for UV light irradiation, and by utilizing both short-wave reflective and UV-resistant materials, the overall lifespan is effectively extended while ensuring the intensity and uniformity of the UV light output. More specifically, UV light source devices need to balance UV light emission efficiency and structural durability in their design, and traditional UV paint spraying methods are not suitable. This is because UV paint absorbs light rather than reflects it, which contradicts the purpose of the light-emitting device to output uniform and sufficiently energetic UV light. Furthermore, while plating the housing with metal materials such as aluminum can provide some protection, it will lead to severe light jamming, making it difficult to achieve the requirement of uniform light output. Therefore, the light-emitting device 1 effectively reflects UV light by using a short-wave reflective material in the housing 11; and the light guide strip 12 is made of a UV-resistant material to prevent yellowing and structural deterioration of the light guide strip 12 after guiding UV light for a long time, while still maintaining the transmittance of UV light. For example, the housing 11 can be made of Nagase material from Japan. TM Reflective PC materials, such as BEF4000U; light guide strip 12 can use Chi Mei. TM UV-resistant PMMA materials, such as CM205, can be used. This configuration effectively improves UV light transmission and uniformity of light emission, and overcomes yellowing issues.

[0023] Please continue to see [the relevant documents / references]. Figure 3 The diagram shows a schematic of another embodiment of the light-emitting device. Considering the requirements for light source configuration and light emission uniformity, the light-emitting device 1 can also be a dual-sided light-incident structure. Specifically, in this embodiment, there are two circuit boards 10, the two short sides 112 of the housing 11 each have an opening 1121, and the light guide strip 12 has two opposing light-incident surfaces 121. Through the dual-sided light-incident design, the complementary effect of light transmission from both ends to the center can be utilized to make the brightness distribution of the light-emitting surface 122 more uniform, effectively improving the light emission uniformity.

[0024] Please continue to see [the website / information]. Figure 4This is a schematic diagram of the light guide strip and housing structure of a light-emitting device according to another embodiment. In this embodiment, the light guide strip 12 of the light-emitting device 1 has a side surface 123, which is adjacent to the light-incident surface 121. The side surface 123 has at least one groove 1231, and the groove 1231 is provided at one end of the side surface 123 near the light-incident surface 121. By providing the groove 1231 near the light-incident surface 121, the light rays incident from the light-incident surface 121 can be locally scattered or released, thereby reducing the brightness peak near the light-incident end and effectively suppressing the excessive brightness phenomenon generated by side-incident light at the light-incident end, thereby improving the overall light emission uniformity of the light guide strip 12. In one embodiment, the side of the short side portion 112 corresponding to the direction of the light outlet 1111 can extend to the position corresponding to the groove 1231 to block the light emitted according to the groove 1231. In the case where the light-emitting device 1 has a dual-sided light-incident structure, the side 123 of the light guide strip 12 can also have a groove 1231 provided at a position adjacent to the two light-incident surfaces 121 to effectively adjust the light-emitting state.

[0025] In another embodiment, the groove 1231 is an elongated structure, and the extension direction of the groove 1231 is transverse to the extension direction of any long side portion 111 of the housing 11. This configuration allows the groove 1231 to better exert its dimming effect near the light-incident end of the light guide strip 12, further improving the phenomenon of excessive brightness at the light-incident end.

[0026] In addition, the groove 1231 can be designed as a V-shaped structure so that the light rays incident from the light-incident surface 121 are partially scattered or guided out through the inclined surfaces on both sides. This structure not only helps to improve the overall light output uniformity of the light guide strip 12, but also maintains the structural strength and manufacturing reliability while maintaining the optical performance of the light guide strip 12.

[0027] Furthermore, any long side 111 of the housing 11 may be provided with a protruding rib 1112 corresponding to the groove 1231, and the protruding rib 1112 is used to interact with the groove 1231. The protruding rib 1112 provided on the long side 111 corresponding to the groove 1231 not only enables precise positioning of the light guide strip 12 within the housing 11, but also ensures the stability of the relative position between the light guide strip 12 and the housing 11 during assembly, reducing slippage or misalignment during installation. This design not only improves assembly efficiency and convenience, but also helps maintain the optical alignment accuracy between the light guide strip 12 and the housing 11, thereby ensuring the uniformity of light output and the stability of the optical performance of the overall light-emitting device 1.

[0028] When a rib 1112 structure corresponding to the groove 1231 of the light guide strip 12 is provided on the long side 111 of the housing 11, the aforementioned characteristics of the groove 1231 being elongated and V-shaped also apply here. For a detailed explanation of the structure and function, please refer to the preceding paragraphs. Furthermore, when both the groove 1231 and the rib 1112 are V-shaped structures, the rib 1112 can cooperate with the inclined surface of the groove 1231, making the positioning of the light guide strip 12 within the housing 11 more precise and stable, simplifying the assembly process, and further improving structural reliability while maintaining optical alignment.

[0029] In summary, the light-emitting device disclosed in this utility model, through the design of the light-incident surface of the light guide strip and the side opening of the housing, allows LED light to effectively enter the light guide strip and be uniformly emitted from the light-emitting surface corresponding to the light-emitting port on the long side of the housing. This improves the uneven light emission problem commonly found in traditional long strip-type light guide modules and enhances the uniformity of light distribution. Furthermore, when the LED is a UV LED, the housing uses a short-wave reflective material to effectively reflect UV light, while the light guide strip uses an anti-UV material to prevent yellowing or structural deterioration caused by long-term UV light guidance, further extending its service life and ensuring light intensity and uniformity. Additionally, when using double-sided light input, the light is transmitted from both ends to the center, and the complementary effect makes the light brightness distribution more uniform. A groove is provided on the side of the light guide strip to locally scatter or release light from the light-incident end, suppressing local brightness peaks caused by side-incident light. Further, in conjunction with the rib structure of the housing, the light guide strip can be effectively fixed inside the housing, enhancing assembly stability and positioning accuracy, and simplifying the assembly process. A V-shaped groove effectively improves light uniformity and maintains structural strength, while a long strip-shaped groove provides excellent dimming effect. When the side has a rib structure, the rib can also be V-shaped along with the groove, allowing for more stable and convenient assembly through beveled surfaces. In summary, the light-emitting device of this invention not only improves the uniformity of overall light distribution and maintains structural stability and assembly accuracy, but also offers advantages such as durability and ease of production.

[0030] [Symbol Explanation]

[0031] 1. Light-emitting device

[0032] 10 Circuit Boards

[0033] 101 LED

[0034] 11. Chassis

[0035] 111 Long side

[0036] 1111 light outlet

[0037] 1112 Convex Rib

[0038] 112 Short side

[0039] 1121 Opening

[0040] 113 Cavity

[0041] 12 light guide strips

[0042] 121 Light-receiving surface

[0043] 122 Light-emitting surface

[0044] 123 Side View

[0045] 1231 Groove

Claims

1. A light-emitting device, characterized in that, Include: At least one circuit board having one LED; A housing has a long strip structure with four long sides and two short sides. The four long sides are arranged adjacent to each other to form a cavity. Each of the long sides has a light outlet. The two short sides are respectively located at opposite ends of the cavity. At least one of the short sides has an opening. The circuit board is arranged corresponding to the short side and the LED is housed in the opening. and A light guide strip is disposed in the cavity and has at least one light-incident surface and one light-outceasing surface. The light-incident surface corresponds to the short side portion having the opening, and the light-outceasing surface is adjacent to the light-incident surface and corresponds to the light-outceasing port. Thus, the light emitted by the LED enters the light guide strip through the opening and is emitted from the light-outceasing surface, forming uniform light emission through the light-outceasing port.

2. The light-emitting device according to claim 1, characterized in that, The LED is a UV LED, the housing is made of short-wave reflective material, and the light guide is made of UV-resistant material.

3. The light-emitting device according to claim 1, characterized in that, The light guide strip has a side surface adjacent to the light incident surface, and the side surface has at least one groove, which is located at one end of the side surface near the light incident surface.

4. The light-emitting device according to claim 3, characterized in that, Each of the long sides of the housing is provided with a protruding rib corresponding to the groove, and the protruding rib is used to combine with the groove.

5. The light-emitting device according to claim 4, characterized in that, The ribs and grooves are both V-shaped structures.

6. The light-emitting device according to any one of claims 3 and 4, characterized in that, The groove is a long strip structure, and the extension direction of the groove is transverse to the extension direction of any of the long sides of the housing.

7. The light-emitting device according to claim 3, characterized in that, The groove has a V-shaped structure.

8. The light-emitting device according to claim 1, characterized in that, The number of circuit boards is two, the two short sides of the housing are respectively provided with the opening, and the light guide strip has two oppositely arranged light incident surfaces.

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