WO2015003322A1

WO2015003322A1 - Led lighting lamp strip and manufacturing method therefor

Info

Publication number: WO2015003322A1
Application number: PCT/CN2013/079055
Authority: WO
Inventors: 张明通
Original assignee: 东莞市奇易电子有限公司
Priority date: 2013-07-09
Filing date: 2013-07-09
Publication date: 2015-01-15

Abstract

An LED lighting lamp strip (1) comprises an outer cover (10) with an accommodating groove (12) and a flexible printed circuit (FPC) (20) disposed in the accommodating groove (12). A surface-mount-device LED (30) is disposed on the front of the FPC (20), and the back is attached to an inner wall (122, 124) of the accommodating groove (12). An inner cover (40) is formed by filling resin doped with a light diffuser in the accommodating groove (12), and the inner cover (40) coats the FPC (20) and the surface-mount-device LED (30). Also provided is a method for manufacturing the LED lighting lamp strip. The LED lighting lamp strip can provide high brightness and emit soft and uniform light rays, and has an area source.

Description

LED light strip and manufacturing method thereof

The present invention relates to a decorative light strip, and more particularly to an LED light strip and a method of manufacturing the same. Background technique

Because the lamp strip or light bar is easy to make graphics, text and other shapes, it has been widely used in decoration and lighting of buildings, roads, furniture, advertisements, signs, signs, etc., especially in recent years, with the large-scale use of LEDs, LED The lamp belt is favored by the public for its energy saving, long service life and good embellishment effect. The LED strip is a decorative strip with a flexible circuit board (FPC) built into the hose. The lamp body is made of a transparent or translucent soft material. Because it has a soft lamp body, it can be easily Adapt to a variety of shapes, such as fixed on a specific modeling pattern or the edge of the wall, to play a decorative effect.

The lamp strip is named after the LEDs are assembled on the FPC at intervals to make it resemble a strip. However, the lights on the market are not uniform during use, and the brightness of the LEDs is the highest. Visually, a plurality of light spots spaced apart on the light strip are formed, the light is uneven, the light is strong, the glare is unobtrusive, or the soft visual effect cannot be achieved. These spaced-apart spots affect the aesthetics and illuminance of the strips to a large extent, limiting the use of strips in decoration and lighting.

Therefore, an LED light strip with no light point or a surface light source is urgently needed. Summary of the invention

It is an object of the present invention to provide an LED lighting strip having high brightness, soft light, uniform hooking, and a surface light source.

Another object of the present invention is to provide a method of manufacturing an LED lighting strip having a high brightness, a soft, uniform light, and a surface light source.

In order to achieve the above object, the present invention provides an LED light-emitting strip comprising an outer cover having a receiving groove and an FPC disposed in the receiving groove, the front surface of the FPC being provided with a patch LED, the back surface of which is attached to An inner wall of the accommodating groove, the LED illuminating lamp strip further includes a doping through the filling in the accommodating groove An inner cover formed by a resin of a light diffusing agent, the inner cover covering the FPC and the patch LED. Specifically, the light diffusing agent has a first refractive index, the resin has a second refractive index, and the first refractive index is not equal to the second refractive index. By using the difference between the refractive index of the material of the light diffusing agent itself and the refractive index of the resin, after the light is refracted multiple times, the light passing through the resin becomes soft and uniform.

Specifically, the light diffusing agent is an inorganic light diffusing agent or an organic light diffusing agent.

More specifically, the inorganic light diffusing agent is nanometer barium sulfate, calcium carbonate or silicon dioxide, and the organic light diffusing agent is an acrylic type, styrene type or acrylic type organic light diffusing agent.

Preferably, the organic diffusing agent is transparent or translucent, and most of the light can pass through, having less influence on the light transmittance of the resin and having high lightness.

Preferably, the resin is a polyurethane.

Preferably, the light transmittance of the outer cover is smaller than the light transmittance of the inner cover, so that the light mainly passes through the inner cover and the light emitting surface is formed on the outer surface of the inner cover.

As a preferred embodiment, the accommodating groove is U-shaped, and the back surface of the FPC is attached to the bottom wall of the accommodating groove. The FPC can be bent in the vertical direction of the plane in which it is located, so that the LED light strip can be bent in the vertical direction of the plane of the bottom wall of the receiving groove.

In another preferred embodiment, the accommodating groove is U-shaped, and the back surface of the FPC is attached to the side wall of the accommodating groove. The LED light strip can be bent in a vertical direction along a plane of the side wall of the receiving groove.

Preferably, a heat dissipation plate of a size corresponding to the FPC is disposed between the back surface of the FPC and the inner wall of the accommodating groove. The heat dissipation plate makes the heat diffusion uniform, improves the heat dissipation, and can dissipate the heat in time, thereby reducing the attenuation speed of the patch LED and prolonging its service life.

Specifically, the heat dissipation plate is a copper foil, an aluminum foil or a stainless steel plate.

The invention also provides a method for manufacturing an LED light strip, comprising the following steps:

(1) Mounting the patch LED on the front side of an FPC;

(2) placing the FPC with the chip LED in a receiving groove of a housing, so that the back surface of the FPC is in contact with an inner wall of the receiving groove;

(3) injecting a resin doped with a light diffusing agent into the accommodating groove, immersing the FPC and the patch LED in the resin, and curing the resin to form an inner cover.

Specifically, the light diffusing agent has a first refractive index, and the resin has a second refractive index, The first refractive index is not equal to the second refractive index. By using the difference between the refractive index of the material of the light diffusing agent itself and the refractive index of the resin, after the light is refracted multiple times, the light passing through the resin becomes soft and uniform.

Preferably, the resin is a polyurethane.

Preferably, a heat dissipation plate of a size suitable for the FPC is mounted between the back surface of the FPC and the inner wall of the accommodating groove. The heat dissipation plate makes the heat diffusion uniform, improves the heat dissipation, and can dissipate the heat in time, thereby reducing the attenuation speed of the patch LED and prolonging its service life.

Compared with the prior art, the LED light-emitting strip of the present invention comprises an outer cover having a receiving groove and an inner cover formed by injecting a resin doped with a light diffusing agent into the receiving groove. The beneficial effects obtained are as follows: (1) The inner cover is formed by injecting resin into the accommodating groove, so that the outer and inner covers are tightly combined to form an integrated structure, which can be completely waterproof and sun-proof, and can be widely applied to various types. occasion. For example, indoor and outdoor decoration in shopping malls, hotels, entertainment venues, lighting arrangement in shopping malls, exhibitions, exhibitions, exhibition layouts, etc.; (2) The resin is doped with a light diffusing agent, which affects the transmittance of the resin. Smaller, high brightness, and the light diffusing agent makes the light passing through the resin soft and uniform, not glare, no light spot, the light of the whole LED light strip is evenly continuous or has a surface light source, and the shape is the same bendable Folded LED fluorescent tube. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view of an LED light-emitting strip of the present invention.

2 is an exploded perspective view of the LED lighting strip shown in FIG. 1.

Fig. 3 is another perspective exploded view of the LED lighting strip shown in Fig. 1.

Figure 4 is a cross-sectional view of the LED lighting strip of the present invention.

Figure 5 is another cross-sectional view of the LED light strip of the present invention.

Fig. 6 is a flow chart showing a method of manufacturing an LED light-emitting strip of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, several different preferred embodiments of the present invention will be described with reference to the accompanying drawings, in which Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 to FIG. 5, the present invention provides an LED light-emitting strip 1 which is substantially rectangular parallelepiped, has a soft texture and good bending property, and includes a cover 10 having a receiving groove 12, The FPC 20 placed in the accommodating groove 12, the SMD LED 30 disposed on the front surface of the FPC 20, and the inner cover 40 formed by injecting a resin doped with a light diffusing agent into the accommodating groove 12, the inner cover 40 is covered FPC 20 and SMD LED 30. Specifically, the inner cover 40 is formed by injecting resin into the accommodating groove 12, so that the outer cover 10 and the inner cover 40 are tightly combined to form an integrated structure, which can be completely waterproof and sun-proof, and can be widely applied to various occasions. For example, indoor and outdoor decoration in shopping malls, hotels, entertainment venues, lighting arrangement in shopping malls, exhibitions, exhibitions, exhibition layouts, etc. Moreover, the resin is doped with a light diffusing agent, which has less influence on the light transmittance of the resin, and has high lightness, and the light diffusing agent makes the light passing through the inner cover 40 soft and uniform, without glare and no light spot. The entire LED light strip 1 has a uniform light or a surface light source, and is shaped like a bendable LED fluorescent tube.

Specifically, the refractive index of the light diffusing agent and the resin are not equal, and the difference between the refractive index of the material of the light diffusing agent itself and the refractive index of the resin is such that after the light is refracted multiple times, the light passing through the resin becomes soft and uniform. The light diffusing agent is an inorganic light diffusing agent or an organic light diffusing agent, the inorganic light diffusing agent is nano barium sulfate, calcium carbonate and silicon dioxide, and the organic light diffusing agent is acrylic type, styrene type and acrylic type organic light diffusing. Agent. The light diffusing agent is generally a microbead having a particle size ranging from 1 μm to 8 μm. Preferably, choose The organic light diffusing agent, the organic diffusing agent itself is transparent or translucent, and most of the light can pass, and the light transmittance of the resin is less affected, and the light brightness is high.

The outer cover 10 is made of a resin-doped toner, and the toner is an opaque substance, so that the light transmittance of the outer cover 10 is smaller than the light transmittance of the inner cover 40, so that the light mainly passes through the inner cover 40 and the inner cover 40 The light-emitting surface of the outer surface form, the light-emitting surface of the present invention is uniform in light, and a surface light source is formed. Preferably, the resin for the outer cover 10 and the inner cover 40 is polyurethane, which has good softness and good waterproof performance, and can improve the quality and service life of the LED light strip.

The LED lamp body is arranged at any different intervals to form the patch LED 30. As shown in FIG. 2~3, preferably, the LED lamp body is densely arranged, as shown in FIG. 2, the LED light strip 1 has higher brightness and emits light. More even. Moreover, the LED light strip 1 can be composed of LED bodies of different colors to meet different needs of customers.

As shown in FIG. 4-5, the accommodating groove 12 is U-shaped, and includes a bottom wall 122 and two side walls 124, and has an opening. The back surface of the FPC 20 can be attached to the bottom wall 122 or the side of the accommodating groove 12. Wall 124. Since the FPC 20 can be bent in the vertical direction of the plane in which it is located, when the FPC 20 is in close contact with the bottom wall 122 of the accommodating groove 12, as shown in FIG. 4, the LED light strip 1 can be along the bottom of the accommodating groove 12. The plane of the wall 122 is bent in the vertical direction, that is, bent in the A direction as shown in FIG. 1. When the back surface of the FPC 20 is attached to the side wall 124 of the receiving slot 12, as shown in FIG. The belt 1 can be bent in the vertical direction of the plane of the side wall 124 of the accommodating groove 12, that is, bent in the B direction as shown in FIG. Therefore, at the time of installation, the LED light strip 1 can be bent at will, and is arbitrarily fixed on a rough surface, and is decorated or illuminated along a complex and variable shape to form various desired shapes. Moreover, the LED light strip 1 can take different lengths required, and the general specifications are 3.015 meters and 1.015 meters.

Optionally, a heat dissipation plate of a size corresponding to the FPC 20 is disposed between the back surface of the FPC 20 and the inner wall of the accommodating groove 12. The heat dissipation plate makes the heat diffusion uniform, improves the heat dissipation, and can dissipate the heat in time, thereby reducing The attenuation speed of the patch LED 30 prolongs its service life. The heat sink may be a copper foil, an aluminum foil or a stainless steel plate, preferably a copper foil.

The present invention also provides a method of manufacturing the LED light-emitting strip 1 described above. As shown in FIG. 6, the method includes the following steps:

S101: mounting the patch LED on the front side of an FPC; S102: placing the FPC with the SMD LED in a receiving groove of a cover, so that the back surface of the FPC is attached to an inner wall of the receiving groove;

S103: injecting a resin doped with a light diffusing agent into the accommodating groove, so that the FPC and the patch LED are immersed in the resin, and the curing resin forms an inner cover.

Specifically, the light diffusing agent has a first refractive index, the resin has a second refractive index, and the first refractive index is not equal to the second refractive index. By using the difference between the refractive index of the material of the light diffusing agent itself and the refractive index of the resin, after the light is refracted multiple times, the light passing through the resin becomes soft and uniform.

More specifically, the inorganic light diffusing agent is nanometer barium sulfate, calcium carbonate or silicon dioxide, and the organic light diffusing agent is an acrylic type, styrene type or propylene S history resin type organic light diffusing agent.

Preferably, the organic diffusing agent is transparent or translucent, and most of the light can pass through, having less influence on the light transmittance of the resin and having a high brightness.

Preferably, the resin is a polyurethane.

Preferably, the light transmittance of the outer cover is smaller than the light transmittance of the inner cover, so that the light mainly passes through the inner cover to form a light-emitting surface on the outer surface of the inner cover.

As a preferred embodiment, the receiving groove is U-shaped, and the back surface of the FPC is attached to the bottom wall of the receiving groove. The FPC can be bent in the vertical direction of the plane in which it is located, so the LED light strip can be bent in the vertical direction of the plane in which the bottom wall of the receiving groove is located.

As another preferred embodiment, the accommodating groove is U-shaped, and the back surface of the FPC is attached to the side wall of the accommodating groove. The LED light strip can be bent in a vertical direction along the plane of the side wall of the receiving groove.

Preferably, a heat sink of a size suitable for the FPC is mounted between the back surface of the FPC and the inner wall of the accommodating groove. The heat sink makes the heat spread evenly, improves the heat dissipation, and can dissipate the heat in time, which reduces the decay speed of the patch LED and prolongs its service life.

Specifically, the heat sink is a copper foil, an aluminum foil or a stainless steel plate.

Compared with the prior art, the present invention forms an inner cover by injecting a resin doped with a light diffusing agent into a receiving groove of a housing. The beneficial effects obtained are as follows: (1) The inner cover is formed by injecting resin into the accommodating groove, so that the outer and inner covers are tightly combined to form an integrated structure, which can be completely waterproof and sun-proof, and can be widely applied to various types. occasion. For example, indoor and outdoor decoration and decoration in shopping malls, hotels, and entertainment venues. Field lighting layout, exhibition, display, exhibition layout, etc.; (2) The resin is doped with a light diffusing agent, which has less influence on the transmittance of the resin, high brightness, and the light diffusing agent makes the light passing through the resin Soft, uniform, non-glare, no light, the entire LED light strips are evenly continuous or have a non-surface source, such as the same bendable LED fluorescent tube.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes made by the scope of the present invention remain within the scope of the present invention.

Claims

Claim

An LED light-emitting strip comprising a housing having a receiving groove and a flexible circuit board disposed in the receiving groove, wherein the flexible circuit board is provided with a patch LED on the front surface thereof, and the back surface of the flexible circuit board is attached to the LED An inner wall of the accommodating groove, further comprising: an inner cover formed by injecting a resin doped with a light diffusing agent into the accommodating groove, the inner cover covering the flexible circuit board And patch LED.

2. The LED lighting strip of claim 1, wherein: the light diffusing agent has a first refractive index, the resin has a second refractive index, and the first refractive index is not equal to the second Refractive index.

The LED light-emitting strip according to claim 1, wherein the light diffusing agent is an inorganic light diffusing agent or an organic light diffusing agent.

The LED light-emitting strip according to claim 3, wherein the inorganic light diffusing agent is nanometer barium sulfate, calcium carbonate or silicon dioxide, and the organic light diffusing agent is acrylic type and styrene. Type or acrylic type organic light diffusing agent.

5. The LED lighting strip of claim 3 wherein: said organic diffusing agent is transparent or translucent.

The LED lighting lamp strip according to claim 1, wherein the resin is polyurethane.

7. The LED lighting strip of claim 1, wherein: the outer cover has a light transmittance that is less than a light transmittance of the inner cover.

The LED light-emitting strip according to claim 1, wherein the accommodating groove is U-shaped, and the back surface of the flexible circuit board is attached to the bottom wall of the accommodating groove.

The LED light-emitting strip according to claim 1, wherein the accommodating groove is U-shaped, and the back surface of the flexible circuit board is attached to the side wall of the accommodating groove.

The LED light-emitting strip of claim 1 , wherein: a heat dissipation circuit adapted to the flexible circuit board is disposed between the back surface of the flexible circuit board and the inner wall of the receiving groove board.

The LED lighting strip according to claim 10, wherein the heat dissipation plate is a copper foil, an aluminum foil or a stainless steel plate.

12. A method of manufacturing an LED light strip comprising the steps of:

Mounting the patch LED on the front side of a flexible circuit board;

The flexible circuit board on which the chip LED is mounted is placed in a receiving groove of a housing, and the back surface of the flexible circuit board is adhered to an inner wall of the receiving groove;

A resin doped with a light diffusing agent is poured into the accommodating groove, the flexible circuit board and the patch LED are immersed in the resin, and the resin is cured to form an inner cover.

The method of manufacturing an LED light-emitting strip according to claim 12, wherein: the light diffusing agent has a first refractive index, the resin has a second refractive index, and the first refractive index is not equal to The second refractive index is described.

The method of manufacturing an LED light-emitting strip according to claim 12, wherein the light diffusing agent is an inorganic light diffusing agent or an organic light diffusing agent.

The method of manufacturing an LED light-emitting strip according to claim 14, wherein the inorganic light diffusing agent is nanometer barium sulfate, calcium carbonate or silicon dioxide, and the organic light diffusing agent is an acrylic type. , styrene type or acrylic resin type organic light diffusing agent.

The method of manufacturing an LED lighting strip according to claim 14, wherein the organic diffusing agent is transparent or translucent.

The method of manufacturing an LED lighting strip according to claim 12, wherein the resin is polyurethane.

The method of manufacturing an LED lighting strip according to claim 12, wherein the outer cover has a light transmittance smaller than a light transmittance of the inner cover.

The method of manufacturing an LED light-emitting strip according to claim 12, wherein the accommodating groove is U-shaped, and a back surface of the flexible circuit board is attached to a bottom wall of the accommodating groove.

The method of manufacturing an LED light-emitting strip according to claim 12, wherein the accommodating groove is U-shaped, and a back surface of the flexible circuit board is attached to a side wall of the accommodating groove.

The method of manufacturing an LED light-emitting strip according to claim 12, wherein: a size of the flexible circuit board is disposed between the back surface of the flexible circuit board and the inner wall of the receiving slot; Adapted heat sink.