WO2005103564A1

WO2005103564A1 - Led light source module packaged with metal

Info

Publication number: WO2005103564A1
Application number: PCT/CN2004/001442
Authority: WO
Inventors: Yaohao Wang; Xing Yan
Original assignee: Yaohao Wang
Priority date: 2004-04-19
Filing date: 2004-12-13
Publication date: 2005-11-03
Also published as: CN2703295Y; JP3131144U

Abstract

A LED light source module packaged with metal case comprises a plurality of LEDs mounted on a metallic circuit board. The metallic circuit board is comprised of a metal substrate and a wiring layer disposed on the upper surface of the metal substrate. The pins of the LEDs are directly bonded to the wiring layer of the metallic circuit board, and a power supply is connected to the wiring layer by two power wires. The metallic circuit board and the connection points of the pins and the power wires are encapsulated by a water-proof insulating adhesive layer. A heat-radiation plate is surface-mounted on the metal substrate such that heat can be conducted to the plate by the metallic circuit board, and then dissipated outside by the plate, therefore the module can have excellent heat-dissipation effects. On the other hand, the whole metallic circuit board and the connection points of the pins and the power wires are all protected by the water-proof insulating adhesive layer, thus the module can also have good water-proof capabilities.

Description

Technical field

The present invention relates to a lighting device using an LED (light emitting diode) as a light source, and particularly to an LED light source module installed in an outdoor signboard such as a billboard, a road sign, and the like, so that the sign has a light-emitting effect. Background technique

At present, there is an LED light source module built into outdoor signs such as billboards and road signs. The existing LED light source modules do not consider the heat dissipation and waterproof function in the structure. They simply insert the LED on the PCB board, and then install the PCB board in a poorly waterproof plastic case. None of the shells. Due to poor heat dissipation and moisture, the existing LED light source modules are not ideal in terms of reliability and service life.

Summary of the invention

An object of the present invention is to provide an LED light source module having good heat dissipation and waterproof performance.

The invention is implemented as follows: The LED light source module uses a metal circuit board as the carrier of the LED, the LED pins are soldered to the wiring layer of the metal circuit board, the power supply inlet and outlet wires are soldered to the wiring layer, and the wiring layer is attached to the wiring layer. The entire metal circuit board is covered with a waterproof insulating adhesive layer, which seals the LED pins and the soldering points of the power supply inlet and outlet wires together, and a metal shell heat sink is connected to the metal substrate of the metal circuit board. The heat sink is thermally coupled to the metal substrate. Since the entire metal circuit board, the pins of the LEP and the welding points of the power cord are covered and protected by waterproof insulation glue, the LED light source module has good waterproof performance. On the other hand, the heat emitted by the LED can be transferred to the heat sink through the metal circuit board, and then emitted by the heat sink.

—1— Confirmation Therefore, the LED light source module also has good heat dissipation performance.

The advantage of the invention is that the good heat dissipation performance ensures that the LED can work continuously and reliably with high brightness. In addition, the good waterproof performance can make the entire light source module work reliably outdoors for a long time, which obviously improves the reliability of the LED light source module. The service life can reach 100,000 hours. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of the second embodiment.

In the figure, each reference numeral is: 1 --- LED-LED light emitting head

2—metal circuit board 2a-wiring layer

2b --- metal substrate 3-heat sink

4—Power inlet line 5—Power outlet line

6—Waterproof insulation adhesive layer 7—Heat conductive adhesive

Detailed ways

Example 1

Referring to FIG. 1, the LED light source module of this embodiment includes a plug-in LED 1, a metal circuit board 2, and a metal shell heat dissipation plate 3. The metal wiring board 2 itself has a wiring layer 2a and a metal substrate 2b, and the wiring layer 2a and the metal substrate 2b are electrically insulated from each other. The plug-in type LED 1 uses the metal circuit board 2 as a carrier, and its pins are soldered on the wiring layer 2 a of the metal circuit board 2. The wiring layer 2a is also soldered with the power supply inlet and outlet lines 4, 5. Multiple LED light source modules can be connected in series through the power supply inlet and outlet lines 4, 5, and the power supply lines of the two LED light source modules can be connected with a commercially available waterproof connector. The number and layout of the LEDs 1 and the specific wiring diagram of the wiring layer 2a can be flexibly set according to actual needs. A waterproof insulating adhesive layer 6 covering the entire metal wiring board is also attached to the wiring layer 2a. Prevent Water-insulating adhesive layer 6—and sealed the .1 pins of the LED1 and the soldering points of the power inlet and outlet wires 4 and 5. As a best embodiment, the waterproof insulating layer 6 should be epoxy resin. The heat sink 3 connected to the metal substrate 2b of the metal circuit board 2 may be made of a metal having a small thermal resistance such as aluminum. The specific shape of the heat dissipation plate 3 can be set flexibly, including various shapes such as circles, rectangles, etc., and the surface of the heat dissipation plate is not limited to a planar shape. Structures such as fins and ribs can be integrally formed on the surface (not shown in the figure) (Out) to further enhance thermal performance. In this embodiment, the periphery of the heat dissipation plate 3 is folded toward the direction of the metal circuit board 2 to form an open box body accommodating the metal circuit board, and the waterproof insulating rubber layer 6 seals the open end of the entire box body. In this structure, the heat dissipation plate 3 also serves as a protective casing, which makes the entire light source module more robust and has the best waterproof performance. In order to further enhance the heat dissipation effect, in this embodiment, a thermally conductive adhesive 7 such as thermally conductive silicone is also bonded between the heat dissipation plate 3 and the metal substrate 2b of the metal circuit board. Since the light emitting angle of the plug-in LED is small, this embodiment specifically protrudes the light emitting head 1a of the LED from the side of the box. In this way, a side-emitting LED light source module can be manufactured. This type of side-emitting LED module can be installed on the inner side of the label when in use, so that the light emitting head of the LED faces away from the light-emitting surface of the label, so that the light emitted by the LED does not directly emit from the light-emitting surface of the label, but passes through the label Multiple diffuse reflections of the inner surface are then emitted from the light emitting surface, so that the illumination on the light emitting surface of the sign can be more uniform. On the other hand, installing the LED light source module on the inner side of the signboard is more conducive to the heat dissipation and waterproof of the LED light source module in some cases.

Example 2

Referring to FIG. 2, the LED 8 of this embodiment is a patch LED, and other structures are the same as those of the embodiment. This structure can be made into a front-emitting LED light source module, and the module has a minimum thickness. In use, the module can be installed on the inner bottom surface of the label, so that the light emitted by the LED directly passes through the label The light emitting surface of the brand fully utilizes the advantages of the large LED light emitting angle to reduce light loss. And in some cases, installing the LED light source module on the inner bottom surface of the label is more conducive to the heat dissipation and waterproof of the module.

As another embodiment, screws can also be used to connect the metal circuit board and the heat sink together, and the metal substrate of the metal circuit board can be in close contact with the heat sink to form a thermally conductive connection. In this way, pay attention that the screws do not touch the wiring layer of the metal circuit board to prevent short circuit.

The above embodiments are provided for understanding the present invention, and are not intended to limit the present invention. Those skilled in the relevant art may also make various changes or modifications on the basis of the technical solution described in the claims. There are screw holes for mounting the entire module on it. Another example is to use a spring to clamp the heat sink and the metal circuit board together. The shape of the model can be made round, square, long, etc. All these equivalent changes or Variations should be within the protection scope of the present invention.

Claims

Rights request

1. A metal case-encapsulated LED light source module, comprising LEDs constituting the light source module, which is characterized in that it uses a metal circuit board as a carrier of the LED, and the metal circuit board is composed of a metal substrate and a wiring layer provided on the metal substrate. The LED pins are connected to the wiring layer of the metal circuit board. Power wiring is also connected to the wiring layer. A waterproof insulating rubber layer covering the metal circuit board is attached to the upper part of the wiring layer. The metal substrate of the metal circuit board is connected to the wiring layer. The heat radiating plate is thermally connected with the metal substrate.

2. The LED light source module according to claim 1, wherein the waterproof insulating glue covers the entire upper part of the metal circuit board, and the pins of the LED and the welding points of the power inlet and outlet wires are all sealed in the waterproof insulating glue layer.

3. The LED light source module according to claim 1 or 2, characterized in that: the waterproof and insulating rubber layer is an epoxy resin layer.

4. The LED light source module according to claim 1 or 2, wherein a fin or a rib is integrally formed on a surface of the heat dissipation plate.

5. The LED light source module according to claim 1 or 2, characterized in that: the periphery of the heat dissipation plate is folded toward the metal circuit board to form an open box body accommodating the metal circuit board, and the waterproof The insulating glue layer seals the open end of the entire box body.

6. The LED light source module according to claim 5, wherein a thermally conductive adhesive is bonded between the heat sink and the metal substrate of the metal circuit board.

7. The LED light source module according to any one of the preceding claims, wherein: the LED is a plug-in LED, and a light emitting head thereof protrudes from a side of the box body.

8. The LED light source module according to any one of the preceding claims, wherein the LED is a patch LED.