CN203979910U - COB-LED light source and lamps - Google Patents

Abstract

The utility model relates to a LED technical field provides a COB-LED light source and lamps and lanterns. The COB-LED light source comprises a light-transmitting substrate, a plurality of LED chips and a light-transmitting packaging body; the printing opacity base plate edge is equipped with anodal pad and negative pole pad, and printing opacity base plate middle part is equipped with the printed circuit line, and a plurality of LED chips are located printing opacity base plate upper surface and loop through the printed circuit line and switch on the series connection between anodal pad and negative pole pad, and the printing opacity packaging body is located printing opacity base plate upper surface and is covered a plurality of LED chips, and printing opacity base plate lower surface is equipped with the reflector layer, and the reflection of light face and a plurality of LED chips of reflector layer are relative. The COB-LED light source has the advantages of uniform light, large light-emitting angle, wide irradiation range and high light-emitting efficiency; a plurality of LEDs in the COB-LED light source are connected in series, so that a power circuit of the plurality of LEDs only needs one rectifier bridge circuit and one constant current IC, and the circuit cost is saved.

Description

COB-LED light source and lamps

technical field

The utility model relates to the technical field of LEDs, in particular to a COB-LED light source and a lamp.

Background technique

COB-LED light source refers to an integrated surface light source formed by pasting several LED chips on a substrate. COB-LED light source technology eliminates the concept of brackets, no electroplating, no reflow soldering, and no SMT process, so the manufacturing process is reduced by nearly one-third, and the cost is also saved by nearly one-third.

The COB (Chip On Board, Chinese: chip on board) process first covers the chip placement point on the upper surface of the substrate with thermally conductive epoxy resin (generally epoxy resin doped with silver particles), and then directly places the chip on the upper surface of the substrate. , heat treatment until the chip is firmly fixed on the upper surface of the substrate, and then use the wire bonding method to directly establish an electrical connection between the chip and the substrate.

The existing COB-LED light source is mainly to paste the LED chip on the substrate with a mirror surface, and rely on the mirror surface to reflect the light emitted by the LED chip to improve the light output efficiency. The light efficiency of this type of COB-LED light source is usually only 70-80lm/W , this is because the light emitted downward by the LED is not effectively utilized. Moreover, the above-mentioned COB-LED light source has a small light emitting angle, and its light directivity is too strong, so it is not suitable for use in fields with special requirements.

Utility model content

The purpose of the utility model is to overcome the defects of the prior art and provide a COB-LED light source with high light output efficiency, large light output angle and good light uniformity effect.

For this reason, the utility model adopts the following technical solutions:

A COB-LED light source, comprising a light-transmitting substrate, a plurality of LED chips and a light-transmitting package;

Positive pads and negative pads are provided on the edge of the transparent substrate, printed circuit lines are provided in the middle of the transparent substrate, and the plurality of LED chips are arranged on the upper surface of the transparent substrate and pass through the printed circuit in turn. The wire conduction is connected in series between the positive pad and the negative pad, the light-transmitting package is arranged on the upper surface of the light-transmitting substrate and covers the plurality of LED chips, and the lower surface of the light-transmitting substrate is provided with A reflective layer, the reflective surface of the reflective layer is opposite to the plurality of LED chips.

Further, the light-transmitting package includes a light-transmitting dam and fluorescent glue condensed in the area surrounded by the light-transmitting dam, and the plurality of LED chips are located in the area surrounded by the light-transmitting dam. In the region, the fluorescent glue covers the LED chip.

Further, the reflective layer is silver plating.

Further, the reflective layer is nickel plating.

Further, the reflective layer is a reflective sheet attached to the lower surface of the transparent substrate.

The utility model also provides a lamp, which includes a lamp housing and the above-mentioned COB-LED light source, and the COB-LED light source is arranged in the lamp housing.

The COB-LED light source provided by the utility model has the following technical effects:

The COB-LED light source is provided with a reflective layer on the lower surface of the light-transmitting substrate, which can reflect the light emitted downwards from multiple LED chips to the upper surface of the light-transmitting substrate, making full use of all the light emitted by the LED chips, and improving the LED light source. High light output efficiency; From the optical principle, the COB-LED light source can also achieve the effect of large light output angle, which is suitable for applications in fields with special requirements. Therefore, the light emitted by the COB-LED light source is uniform, the light emission angle is large, the irradiation range is wide, and the light emission efficiency is high.

In addition, multiple LED chips in the COB-LED light source are connected in series, so the power supply circuit of the multiple LED chips only needs a rectifier bridge circuit and a constant current IC, which saves circuit costs.

The utility model also provides a lamp, which includes a lamp housing and the above-mentioned COB-LED light source, and the COB-LED light source is arranged in the lamp housing.

The light emitted by the lamp using the above-mentioned COB-LED light source has the advantages of uniformity, large light emission angle, wide irradiation range and high light emission efficiency.

Description of drawings

Fig. 1 is the front view of the COB-LED light source in the embodiment of the utility model;

Fig. 2 is the sectional view of A-A among Fig. 1;

Fig. 3 is the rear view of the COB-LED light source in the embodiment of the utility model;

Fig. 4 is a schematic diagram of an upper surface of a light-transmitting substrate without a light-transmitting package in an embodiment of the present invention;

Fig. 5 is the optical path diagram when the COB-LED light source is used in the embodiment of the utility model;

Fig. 6 is a schematic diagram of the power supply circuit of the COB-LED light source in the embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

See Figures 1-4.

A COB-LED light source, comprising a light-transmitting substrate 1, a plurality of LED chips 2 and a light-transmitting package body 3; the edge of the light-transmitting substrate 1 is provided with a positive electrode pad 11 and a negative electrode pad 12, and the middle of the light-transmitting substrate 1 is provided with a printed The circuit wire 13, a plurality of LED chips 2 are arranged on the upper surface of the light-transmitting substrate 1 and are sequentially connected in series between the positive electrode pad 11 and the negative electrode pad 12 through the printed circuit wire 13, and the light-transmitting package body 3 is arranged on the light-transmitting substrate The upper surface of 1 covers a plurality of LED chips 2 , and the lower surface of the light-transmitting substrate 1 is provided with a reflective layer 4 , and the reflective surface of the reflective layer 4 is opposite to the plurality of LED chips 2 .

The luminous effect of the COB-LED light source will be further described below with reference to FIG. 5 . When a plurality of LED chips 2 are lit, the light emitted by the plurality of LED chips 2 is emitted in all directions, and the light emitted downwards directly enters the light-transmitting substrate 1, and when the light is incident on the reflective layer 4, the light is reflected by the reflective layer 4 , after multiple round-trip reflections, the light will finally exit the upper surface of the transparent substrate 1, which effectively utilizes the downward emission of light from a plurality of LED chips 2, and at the same time, because the light that is finally reflected from the upper surface of the transparent substrate The direction is angled, which has the effect of astigmatism, and the overall light output angle is large. It can be seen that by setting the reflective layer 4 on the lower surface of the light-transmitting substrate 1, the COB-LED light source can reflect the light emitted downwards from multiple LED chips 2 to the upper surface of the light-transmitting substrate 1, making full use of all the light emitted by the LEDs. , which improves the light output efficiency of the LED; it can be seen from the optical principle that the COB-LED light source can also achieve the effect of a large light output angle.

In addition, in conjunction with Figure 6. Multiple LED chips 2 in the COB-LED light source are connected in series, so the power supply circuit of the multiple LED chips 2 only needs one rectifier bridge circuit 5 and one constant current IC6, which saves circuit cost.

As a further improvement of the present utility model, the light-transmitting package body 3 includes a light-transmitting dam 31 and fluorescent glue 32 condensed in the area surrounded by the light-transmitting dam 31, and a plurality of LED chips 2 are located in the area surrounded by the light-transmitting dam 31. In the enclosed area, fluorescent glue 32 covers a plurality of LED chips 2 . The light-transmitting dam 31 and the fluorescent glue 32 allow light to pass through, effectively utilizing the light and at the same time playing an effect of light uniformity. The material of the transparent dam 31 can be silica gel or resin. The fluorescent glue 32 is composed of fluorescent powder plus silica gel or resin.

As one of the embodiments of the present invention concerning the reflective layer 4, the reflective layer 4 may be a silver plated layer.

As another embodiment of the present invention regarding the reflective layer 4, the reflective layer 4 may also be a nickel plating layer.

As yet another embodiment of the present invention regarding the reflective layer 4 , the reflective layer 4 may also be a reflective sheet attached to the lower surface of the transparent substrate 1 .

The above three implementations of the reflective layer 4 all have their own technical effects, and any implementation can be selected according to actual needs during production. Of course, the arrangement of the reflective layer 4 is not limited to the above three methods, and any embodiment that can achieve the reflective effect falls within the protection scope of the present invention.

In addition, the transparent substrate 1 can be a sapphire substrate with high light transmittance, a glass substrate or a substrate made of other materials with high light transmittance.

The embodiment of the utility model also provides a lamp (not shown in the figure), which includes a lamp housing and the above-mentioned COB-LED light source, and the COB-LED light source is arranged in the lamp housing. The light emitted by the lamp adopting the above-mentioned COB-LED light source is uniform, has a large light emitting angle, a wide irradiation range, and high light emitting efficiency.

The above description is only a preferred embodiment of the utility model, and its structure is not limited to the shapes listed above. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should include Within the protection scope of the present utility model.

Claims (6)

1. A COB-LED light source, characterized in that it includes a light-transmitting substrate (1), a plurality of LED chips (2) and a light-transmitting package (3); An anode pad (11) and a cathode pad (12) are provided on the edge of the light-transmitting substrate (1), a printed circuit line (13) is provided in the middle of the light-transmitting substrate (1), and the plurality of LED chips ( 2) It is arranged on the upper surface of the transparent substrate (1) and connected in series between the positive electrode pad (11) and the negative electrode pad (12) through the printed circuit line (13) sequentially. The optical package (3) is arranged on the upper surface of the light-transmitting substrate (1) and covers the plurality of LED chips (2), the lower surface of the light-transmitting substrate (1) is provided with a reflective layer (4), and the The reflective surface of the reflective layer (4) is opposite to the plurality of LED chips (2). 2. The COB-LED light source according to claim 1, characterized in that: the light-transmitting encapsulation (3) includes a light-transmitting dam (31) and is formed by condensation on the light-transmitting dam (31) The fluorescent glue (32) in the area, the plurality of LED chips (2) are located in the area surrounded by the light-transmitting dam (31), and the fluorescent glue (32) covers the LED chips (2 ). 3. The COB-LED light source according to claim 1, characterized in that: the reflective layer (4) is silver plating. 4. The COB-LED light source according to claim 1, characterized in that: the reflective layer (4) is nickel plating. 5. The COB-LED light source according to claim 1, characterized in that: the reflective layer (4) is a reflective sheet attached to the lower surface of the transparent substrate (1). 6. A lamp, comprising a lamp housing, characterized in that it further comprises the COB-LED light source according to any one of claims 1-5, and the COB-LED light source is arranged in the lamp housing.