CN108735880A - A kind of ultraviolet lamp encapsulation structure increasing light emission rate - Google Patents

Abstract

The present invention provides a kind of ultraviolet lamp encapsulation structure increasing light emission rate, including ultraviolet lamp, frame and cover board, and ultraviolet lamp is placed in frame center, frame upper cover cover board, cover board light transmission, and cover board is made of at least two layers number of plies that refraction coefficient continuously decreases from inside to outside.This kind of design method can reduce light by total internal reflection caused by cover board.In addition, cover board light transmission part is concentration structure, concentration structure includes planoconvex spotlight, biconvex lens or concave-convex lens, and narrow upper width under frame endothecium structure, and reflective membrane is coated in frame internal layer.In this way, increasing light emission rate from multi-angle.

Description

A packaging structure for ultraviolet lamps with increased light output

technical field

The invention belongs to the field of deep ultraviolet LED packaging, and in particular relates to a packaging structure of an ultraviolet lamp that increases the light output rate.

Background technique

Ultraviolet sterilization technology has been widely used, and its broad-spectrum sterilization is high, and it has a high-efficiency killing effect on almost all bacteria and viruses. The ultraviolet light source is very scarce, and the ultraviolet light source commonly used at present is mainly a mercury lamp. With the advancement of technology, deep ultraviolet light-emitting diodes (LEDs) have gradually entered the market, which have the characteristics of low power consumption, long life, and no pollution. Compared with mercury lamps, the wavelength of deep ultraviolet light-emitting diodes can be adjusted through the production process of semiconductor materials, and is more environmentally friendly.

In the use of ultraviolet LEDs, the packaging of light-emitting chips is a key step, and how to improve the luminous efficiency is a hot research topic in the industry. In the prior art, a flat single-layer cover plate is usually used to package the ultraviolet LED. As shown in Figure 1, the prior art uses a deep ultraviolet light source made of a deep ultraviolet LED to package the light-emitting chip a into the frame b, and the frame b A quartz lens c is set above to adjust the luminous angle. When quartz lens c is used, light will be refracted. The refractive index of quartz lens c material is usually above 1.5, while the air medium has a refractive index of 1. Since there is no transition layer between them, the packaging material has a single refractive index, resulting in lens c being completely The reflection angle is small, so that a large part of the light cannot be refracted out of the lens c but reflected back into the frame b, resulting in a large waste of light energy.

In view of the above reasons, there is a need for an ultraviolet lamp packaging structure that can further increase the light extraction rate.

Contents of the invention

The invention provides an ultraviolet lamp packaging structure for increasing the light output rate, including an ultraviolet lamp, a frame and a cover plate, the ultraviolet lamp is placed in the center of the frame, the frame is covered with a cover plate, the cover plate is light-transmissive, and the cover plate is composed of at least two layers It consists of layers whose refractive index gradually decreases from the inside to the outside.

Preferably, the light-transmitting part of the cover plate is a light-gathering structure, and the light-gathering structure includes a plano-convex lens, a double-convex lens, or a concave-convex lens.

Preferably, the structure of the inner layer of the frame is narrow at the bottom and wide at the top, and the inner layer of the frame is coated with a reflective film.

Preferably, the central position of the cover plate is composed of one or more types of quartz glass, silica gel or resin.

Preferably, the thickness of each layer combined into different layers of the cover plate ranges from 100 microns to 2 mm.

Preferably, the different layers of the cover plate are glued or sealed and pressed together.

Preferably, the cover plate is straight and covers only the upper part of the frame, or is concave and covers the upper and side parts of the frame.

Preferably, the cover plate and the frame are sealed and bonded by glue.

Preferably, the ultraviolet lamp is a deep ultraviolet LED.

The present invention has following advantage and beneficial effect:

The packaging structure of the ultraviolet lamp with increased light extraction rate provided by the present invention includes an ultraviolet lamp, a frame and a cover plate, the ultraviolet lamp is placed in the center of the frame, the frame is covered with a cover plate, the cover plate is light-transmitting, and the cover plate is refracted from the inside to the outside by at least two layers The coefficients gradually decrease in the number of layers. This design method can reduce the total internal reflection generated by the light passing through the cover plate. In addition, the light-transmitting part of the cover plate is a light-gathering structure, and the light-gathering structure includes a plano-convex lens, a double-convex lens, or a concave-convex lens. In this way, the light output rate is increased from multiple angles.

After reading the detailed description of the embodiments of the present application in conjunction with the accompanying drawings, other features and advantages of the present application will become clearer.

Description of drawings

Fig. 1 is the schematic diagram of the package structure of ultraviolet LED in the prior art;

Fig. 2 is a schematic diagram of the packaging structure of an ultraviolet lamp with increased light extraction rate provided by a preferred embodiment of the present invention;

Fig. 3 is a schematic diagram of the packaging structure of an ultraviolet lamp with increased light extraction rate provided by another preferred embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

The packaging structure of the ultraviolet lamp for increasing the light extraction rate provided by the present invention includes an ultraviolet lamp, a frame and a cover plate. The ultraviolet lamp is placed in the center of the frame, and the frame is covered with a cover plate, wherein the cover plate is transparent, and the frame material has good thermal conductivity, for example, aluminum nitride. Specifically, the cover is straight and only covers the upper part of the frame, or is concave and covers the upper and side parts of the frame. Compared with the straight cover, the concave cover is more conducive to increasing the sealing degree between the bracket and the cover. At the same time, the cover plate and the frame are sealed and bonded by glue to further increase the airtightness. Herein, the ultraviolet lamp described in this embodiment is a deep ultraviolet LED, and other ultraviolet light sources such as ultraviolet mercury lamps may also be included.

Fig. 2 is a schematic diagram of the packaging structure of an ultraviolet lamp with increased light extraction rate provided by a preferred embodiment of the present invention. As shown in FIG. 2 , the cover plate 3 is straight and covers only the top of the frame 2 , and the light emitted by the ultraviolet lamp 1 is refracted outward through the cover plate 3 . Here, the light-transmitting part of the cover plate 3 is composed of at least two layers whose refractive index gradually decreases from the inside to the outside.

Specifically, the light-transmitting part of the cover plate 3 is a light-condensing structure, and the light-condensing structure includes a plano-convex lens, a bi-convex lens, or a concave-convex lens. In this embodiment, the light-condensing structure is a bi-convex lens. The light-transmitting part of the cover plate 3 is composed of one or more types of quartz glass, silica gel or resin. In FIG. 2, the cover plate 3 is composed of upper and lower layers, such as a resin layer 31 and a quartz glass layer 32. , wherein the refractive index of the resin layer 31 is smaller than that of the quartz glass layer 32 .

In this embodiment, in order to reduce light loss and ensure product quality at the same time, the thickness range of each layer of the different layers of the cover plate is between 100 microns and 2 mm, wherein the different layers of the cover plate are bonded or sealed by glue Lamination.

In addition, the inner layer of the frame is generally a square structure. In this embodiment, the above-mentioned square structure is narrow at the bottom and wide at the top, and the side section is trapezoidal, and the bottom and side 21 of the inner layer of the frame are coated with a reflective film, such as a reflective aluminum film. In this way, the light output rate of scattered light in the inner layer of the frame is increased. Please refer to FIG. 2 , the bottom of the ultraviolet lamp 1 is also provided with a heat sink 11 , which is embedded in the bottom of the frame 2 , and the leads of the ultraviolet lamp 1 are led out through the frame.

Fig. 3 is a schematic diagram of the packaging structure of an ultraviolet lamp with increased light extraction rate provided by another preferred embodiment of the present invention. As shown in Figure 3, the light-gathering structure of the light-transmitting part of the cover plate 3' is a concave-convex lens, which includes two layers. Shooting adds layers of transition.

In summary, the package structure of the ultraviolet lamp with increased light output rate provided by the preferred embodiment of the present invention includes an ultraviolet lamp, a frame and a cover plate, the ultraviolet lamp is placed in the center of the frame, the frame is covered with a cover plate, and the cover plate is light-transmissive. And the cover plate is composed of at least two layers whose refractive index gradually decreases from inside to outside. This design method can reduce the total internal reflection generated by the light passing through the cover plate. In addition, the light-transmitting part of the cover plate is a light-gathering structure, and the light-gathering structure includes a plano-convex lens, a double-convex lens, or a concave-convex lens. In this way, the light output rate is increased from multiple angles.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims (9)

1. a kind of ultraviolet lamp encapsulation structure increasing light emission rate, including ultraviolet lamp, frame and cover board, ultraviolet lamp are placed in frame Centre, frame upper cover cover board, the cover board light transmission, which is characterized in that cover board by least two layers from inside to outside refraction coefficient gradually drop Low number of plies composition.

2. the ultraviolet lamp encapsulation structure according to claim 1 for increasing light emission rate, which is characterized in that cover board light transmission part is Concentration structure, the concentration structure include planoconvex spotlight, biconvex lens or concave-convex lens.

3. the ultraviolet lamp encapsulation structure according to claim 1 for increasing light emission rate, which is characterized in that under frame endothecium structure Narrow upper width, and frame internal layer is coated with reflective membrane.

4. the ultraviolet lamp encapsulation structure according to claim 1 for increasing light emission rate, which is characterized in that the cover board transmittance section Divide and is formed by one or more type combinations in quartz glass, silica gel or resin.

5. the ultraviolet lamp encapsulation structure according to claim 1 for increasing light emission rate, which is characterized in that be combined into cover board difference Every layer thickness range of layer is at 100 microns -2 millimeters.

6. the ultraviolet lamp encapsulation structure according to claim 1 for increasing light emission rate, which is characterized in that between cover board different layers Pressing is bonded or sealed by glue.

7. the ultraviolet lamp encapsulation structure according to claim 1 for increasing light emission rate, which is characterized in that the cover board is in straight panel Type only covering framework top, or in concave cladding framework upper and side.

8. the ultraviolet lamp encapsulation structure according to claim 7 for increasing light emission rate, which is characterized in that the cover board and frame It is sealed engagement by glue.

9. the ultraviolet lamp encapsulation structure according to claim 1 for increasing light emission rate, which is characterized in that the ultraviolet lamp is deep Ultraviolet LED.