COB lamp strip capable of reducing light-emitting dark areas

Abstract

The COB lamp strip capable of reducing the light-emitting dark area comprises an FPC circuit board, a bonding pad is welded on the FPC circuit board, a plurality of light-emitting chips are welded on the bonding pad in the linear direction of the bonding pad, the light-emitting chips are covered with fluorescent colloid, the fluorescent colloid is of a spherical protruding structure, and the light-emitting dark area is smaller than the light-emitting dark area. The radius of an arc on the outer side of the fluorescent colloid is 1.2-1.8 mm, and the height of the fluorescent colloid is 1.1-1.5 mm. Compared with the prior art, according to the COB lamp strip capable of reducing the light-emitting dark areas, the COB light source is directly welded to the surface of the flexible circuit board, and the outer side of the light-emitting chip is covered with the layer of arc-shaped fluorescent colloid of the spherical structure; the light-emitting chips are arranged on the lamp strip and matched with the fluorescent colloid, so that the brightness of light emitted by the light-emitting chips is higher, the diffusion effect along the arc face of the colloid is better, the range of the light-emitting angle is enlarged, the overall lighting effect of the lamp strip is improved, and the dark space problem of the lamp strip is solved; and the glue consumption can be saved, and the overall production and manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of light strip production, in particular to a COB light strip capable of reducing luminous dark areas. Background Art

[0002] COB light strips are LED products formed by welding LED chips on a flexible circuit board and coating the surface of the LED chips with continuous silicone. They have the advantages of long service life, energy saving and environmental protection, and are therefore increasingly widely used in the field of lighting. The currently used SMD light strips require separate light-emitting components, which have a small light-emitting angle and cannot emit light from the side, resulting in obvious dark areas between the light-emitting devices. The use of COB light strips will improve the lighting effect, but the current COB light strips use a continuous glue-drawing structure, and the phosphors between the chips cannot be effectively excited by the LED flip chip, and dark areas will also appear. Utility Model Content

[0003] The utility model aims to provide a COB light strip capable of reducing the dark areas of light emission, so as to solve the technical problems in the background technology.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0005] A COB light strip capable of reducing luminous dark areas comprises an FPC circuit board, a soldering pad is welded on the FPC circuit board, a plurality of light-emitting chips are welded on the soldering pad along a straight line direction, the light-emitting chip is covered with a fluorescent colloid, the fluorescent colloid is a spherical convex structure, the arc radius of the outer side of the fluorescent colloid is 1.2-1.8 mm, and the height of the fluorescent colloid is 1.1-1.5 mm.

[0006] The distance between adjacent fluorescent colloids is 2.0-2.5 mm.

[0007] A plurality of constant voltage and current limiting resistors are also welded on the pads. The constant voltage and current limiting resistors are inside the fluorescent colloid and are connected in series with the light-emitting chip.

[0008] The plurality of constant voltage and current limiting resistors are arranged in a straight line along the length direction of the FPC circuit board.

[0009] Compared with the prior art, the COB light strip of the present application can reduce the dark area of ​​the light. The COB light source is directly welded on the surface of the flexible circuit board, and a layer of fluorescent colloid with a circular arc spherical structure is covered on the outside of the light-emitting chip. The fluorescent colloid is used to make the light emitted by the light-emitting chip brighter and the diffusion effect along the circular arc surface of the colloid is better, thereby increasing the range of the light-emitting angle and improving the overall lighting effect of the light strip, thereby solving the dark area problem of the light strip. In addition, the dot-shaped glue dispensing arrangement method adopted by the light strip of the present application can also save the amount of glue and reduce its overall production cost. Moreover, the glue dispensing coverage method of a single chip is more controllable, the product stability is better, and even if some bad spots appear, they can be repaired in a targeted manner, and the maintenance cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 : A schematic diagram of the three-dimensional structure of the present application;

[0011] Figure 2 : Internal structure diagram of this application;

[0012] Figure 3 : Cross-sectional view of fluorescent colloid in this application. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0014] Specific embodiment 1: Please refer to Figures 1 to 3 In an embodiment of the utility model, a COB light strip capable of reducing dark luminous areas includes an FPC circuit board 1, a pad is welded on the FPC circuit board 1, a plurality of light emitting chips 2 are welded on the pad along a straight line direction thereof, and the light emitting chip 2 is covered with a fluorescent colloid 4, which is prepared according to the light color requirements by using fluorescent powder, light-transmitting glue and diffusion powder in a certain ratio, and then a glue dispensing device is used to perform glue dispensing operation on the light emitting chip 2.

[0015] The fluorescent colloid 4 is a raised spherical structure, the arc radius R1 of the outer side of the fluorescent colloid 4 is 1.2-1.8 mm, the height H1 of the fluorescent colloid 4 is 1.1-1.5 mm, and the spacing D1 between adjacent fluorescent colloids 4 is 2.0-2.5 mm. In the present embodiment, the height H1 of the fluorescent colloid 4 is 1.3 mm, the radius R1 of the fluorescent colloid 4 is 1.5 mm, and the spacing D1 between adjacent fluorescent colloids 4 is 2.2 mm.

[0016] A plurality of constant-voltage current-limiting resistors 3 are also welded on the pad, and the constant-voltage current-limiting resistors 3 are in the fluorescent colloid 4. The constant-voltage current-limiting resistors 3 are connected in series with the light-emitting chip 2. In the present application, a plurality of constant-voltage current-limiting resistors 3 are arranged in a straight line along the length direction of the FPC circuit board 1. The number of constant-voltage current-limiting resistors 3 can be connected in series according to the required rated power of the light source. The light-emitting chip 2 and the constant-voltage current-limiting resistor 3 are fixed at the pad position of the FPC circuit board 1 using a die-bonding device. The present application covers the light-emitting chip 2 and the constant-voltage current-limiting resistor 3 with the fluorescent colloid 4, which can effectively ensure that they are not affected by external forces during subsequent use.

[0017] Compared with the prior art, the COB light strip of the present application can reduce the dark area of ​​the light. The COB light source is directly welded on the surface of the flexible circuit board, and a layer of fluorescent colloid with a circular arc spherical structure is covered on the outside of the light-emitting chip. The fluorescent colloid is used to make the light emitted by the light-emitting chip brighter and the diffusion effect along the circular arc surface of the colloid is better, thereby increasing the range of the light-emitting angle and improving the overall lighting effect of the light strip, thereby solving the dark area problem of the light strip. In addition, the dot-shaped glue dispensing arrangement method adopted by the light strip of the present application can also save the amount of glue and reduce its overall production cost. Moreover, the glue dispensing coverage method of a single chip is more controllable, the product stability is better, and even if some bad spots appear, they can be repaired in a targeted manner, and the maintenance cost is lower.

[0018] It is obvious to those skilled in the art that the present invention is not limited to the details of the foregoing exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0019] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A COB light strip capable of reducing dark areas of light emission, characterized in that: The invention comprises an FPC circuit board, wherein a soldering pad is welded on the FPC circuit board, and a plurality of light-emitting chips are welded on the soldering pad along the straight direction thereof, and the light-emitting chip is covered with a fluorescent colloid, wherein the fluorescent colloid is a spherical convex structure, and the arc radius of the outer side of the fluorescent colloid is 1.2-1.8 mm, and the height of the fluorescent colloid is 1.1-1.5 mm; the spacing between adjacent fluorescent colloids is 2.0-2.5 mm; and a plurality of constant-voltage current-limiting resistors are also welded on the soldering pad, wherein the constant-voltage current-limiting resistors are inside the fluorescent colloid, and the constant-voltage current-limiting resistors are connected in series with the light-emitting chip.

2. A COB light strip capable of reducing dark areas of light emission according to claim 1, characterized in that: The plurality of constant voltage and current limiting resistors are arranged in a straight line along the length direction of the FPC circuit board.

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