CN2874772Y - Integrated light emitting unit - Google Patents

Abstract

An integrated light emitting unit is composed of a light emitting diode 1 , a plane light guide 2 , a heat sink 3 , a circuit substrate 4 , and a power input terminal 5 . A plurality of light-emitting diodes are packaged inside the planar light guide 2, and their light-emitting surfaces point to the outer peripheral end face of the planar light guide 2. The light emitted by the light-emitting diodes propagates through the planar light guide 2 and is output from the outer end face. The circuit substrate has a power input terminal 5, a constant current drive circuit and a light emitting diode. The heat sink is closely combined with the circuit substrate and the plane light guide to form a high-brightness light-emitting diode integrated light-emitting unit with compact structure, good heat dissipation, and outer edge light. This unit can be used independently or at intervals to form a decorative lamp. Multiple units can be closely bonded and used in layers, and the power input terminals can be connected in parallel to form a beautiful, practical, safe and reliable light-emitting diode lamp with any power.

Description

An integrated lighting unit

technical field

The utility model relates to an integrated light-emitting unit composed of light-emitting diodes that emit light at the outer edge, which includes a plane light guide body, a light-emitting diode, a circuit substrate, a constant current circuit and a heat sink, and has a power supply lead-out line. The unit can be driven by a common DC power supply. Multiple light-emitting units of this type are stacked and connected in parallel to form a high-power LED lamp with beautiful appearance, convenient use, safety, reliability and low cost.

Background technique

In recent years, light-emitting diode devices (LEDs) with high brightness, high efficiency and energy saving, and long service life have appeared on the market, and various forms of light-emitting diode lamps composed of light-emitting diodes have appeared.

However, since the light-emitting diode (LED) device is a current-type device, the direction of light emission is single, it needs to be driven by DC voltage, the driving voltage is low, and a large amount of heat is generated during operation, so it is usually made of a single high-power die Or multiple tube cores are connected in parallel. The current of a single tube is large, the voltage is low, and the heat is high. It needs to be made into a planar structure. Usually, one side is a light-emitting surface and the other side is a heat-dissipating surface. It needs a special voltage conversion device to power it when in use, and it can work normally with a dedicated heat sink or a large heat dissipation structure. Light-emitting diode (LED) lamps composed of such devices usually have a planar distribution structure of LED devices and must be equipped with special reflective devices and lamps, which not only have high cost, low efficiency, serious glare, and poor safety, but are also inconvenient to use. It is also difficult to directly replace the currently used light sources.

The invention patent with the application number of 200410027387.6 of the State Intellectual Property Office of China proposes a unit composed of light-emitting diodes and light guide plates, and the light-emitting diode lamps formed from this are used to manufacture high-power, high-brightness, good safety, compatible Strong LED lights offer a viable solution. However, since the implementation scheme involved in this patent requires the cooperation of precision assembly technology, its implementation cost is relatively high. As an improvement of the patent implementation, the utility model improves the heat dissipation structure, makes the structure more reasonable, can effectively simplify the manufacturing process, reduce the manufacturing cost, and is more conducive to the promotion and popularization of products.

Contents of the invention

The technical problem solved by the utility model is to provide a light-emitting unit composed of a plurality of low-power light-emitting diodes of common structure and a light guide body of circular structure. and a transparent light guide, characterized in that a plurality of light-emitting diode dies are packaged in the same circular light guide with a central inner hole, the light-emitting diode die is located near the inner circle of the light guide, and its light-emitting surface faces the guide The outer edge of the light body, the light emitted by it propagates through the light guide body. Since the light can have a total reflection effect in the planar light guide body, it can be efficiently transmitted in the light guide body, and the light can be concentrated and emitted from the outer edge of the light guide body, which constitutes an edge glow. light emitting unit.

The utility model is also characterized in that the light guide body has a central circular hole, and its outer edge shape can be circular, elliptical, pear-shaped, irregular curved, square, rectangular, rhombus, triangular, polygonal.

The utility model is also characterized in that the light-emitting surface of the light-emitting diode points to the outer edge of the light guide body, and the connection part between the lead-out pin of the light-emitting diode and the circuit substrate is perpendicular to the plane of the light guide body.

In addition to the above-mentioned light-emitting diode (core) and photoconductor, the utility model is also characterized in that it also includes a circuit substrate for installing and connecting the light-emitting diode LED, a constant current drive circuit for driving the light-emitting diode group, and is in contact with the circuit substrate. Heat sink for cooling light-emitting diodes and other heating elements.

Because the utility model uses a plurality of light-emitting diodes (cores), it is characterized in that each tube core has an independent lead-out pin, and the lead-out pin is perpendicular to the light guide body and the circuit substrate in the installation connection section.

The emission color (wavelength) of the light emitting diode (core) can be red, green, yellow, blue, white or mixed colors.

The utility model is also characterized in that it also includes a circuit substrate, on which there are pads for welding light-emitting diodes, the pads are connected to other circuits, and the connection relationship can be changed by changing the circuit connections on the circuit substrate (such as series or parallel connection). ). The circuit substrate is shaped like a light guide and has a large central hole. The circuit substrate can be made of copper-clad laminates of common materials, or copper-clad laminates of metal substrates.

The utility model is also characterized in that at least one set of constant current circuits is installed on the circuit substrate, and each set of constant current circuits drives a set of light emitting diodes connected to the circuit substrate. The connection relationship between the constant current circuit and the LED groups it drives is in series. The function of the constant current circuit is to provide the light-emitting diodes with a stable driving current that basically meets the set value when the input voltage of the light-emitting diode group driven by it is a rated voltage or a voltage above the rated voltage.

Since the light-emitting unit adopts a plurality of light-emitting diodes in series, under the same input power, the input voltage is increased, the input current is reduced, the heat generation of the device is improved, and the damage to the circuit substrate and other related components is reduced. Requirements, simplify the manufacturing process, and thus significantly reduce the cost.

The utility model is also characterized in that it also has at least one heat sink, and the heat sink has a thermal contact relationship with the circuit connecting the light-emitting diode and other heating elements on the circuit substrate, or is in contact with the heat conductor of the substrate using a heat-conducting metal material, and the light-emitting diode and The heat generated by other components during operation can be conducted to the heat sink through the pad and circuit connection, and dissipated outward through the heat sink, so as to protect the temperature rise of the heating element from being too high, so as to ensure its performance and prolong the life of the heat sink. service life. The heat sink can be made of materials with good thermal conductivity, such as copper, aluminum, etc., or non-metallic materials.

The utility model is also characterized in that the heat sink can be a structure with a larger central hole, or a structure with a plurality of small holes distributed in the center, and there can also be a plurality of holes on it for installing power lead wires. process holes. The size and shape of the inner and outer edges of the heat sink can be the same as or different from the size and shape of the outer edge of the light guide, and its inner hole can be smaller than that of the circuit substrate; its inner edge can be smooth or serrated Shape, etc. are conducive to increasing the structure of the heat dissipation area. The heat sink can use the exposed surface to dissipate heat, and this surface can be an outer edge surface, an inner edge surface, or multiple surfaces at the same time.

The utility model is also characterized in that the heat sink of the light-emitting unit is tightly installed with the circuit substrate and the light guide, and is fully sealed except for the power connection point.

A plurality of light-emitting units of the utility model are stacked to form a hollow heat dissipation channel, and its power input terminals are connected in parallel, and cooperate with power conversion circuits, protection circuits, structural parts, lamp holders, fans, etc., and can be conveniently formed through the hollow Structure or appearance heat dissipation, compact structure, simple manufacture, safe and reliable, low cost, good compatibility, easy to use decorative luminescent tubes, guardrail lights, and high-brightness light-emitting diode (LED) lights.

Description of drawings

The utility model and its implementation will be further described below in conjunction with the schematic diagrams.

Fig. 1 is a schematic diagram of the basic structure of the integrated light emitting unit.

The schematic diagram of the full section of the basic structure of the integrated light-emitting unit described in Fig. 2-1.

Fig. 2-2 is a schematic cross-sectional view of the integrated light emitting unit in which the heat sink is smaller than the light guide. .

FIG. 3 is a schematic diagram of the arrangement relationship of light emitting diodes.

Fig. 4 is a schematic diagram of the connection relationship between the constant current circuit and the light emitting diode.

FIG. 5 is a schematic diagram of a sawtooth-shaped inner hole of the heat sink.

Fig. 6 is a schematic diagram of a plurality of inner holes in the heat sink.

Fig. 7 is a schematic diagram of the stacked use of the light-emitting units, the parallel connection of power supplies, and the use of internal and external surfaces for heat dissipation.

Fig. 8 is a schematic diagram of the stacked use of the light-emitting units, the parallel connection of power supplies, and the use of inner holes for heat dissipation.

Detailed ways

Fig. 1 is a schematic diagram of the basic structure of the integrated light-emitting unit. In the figure, 1 is an LED light-emitting diode (core), which is packaged inside the light guide body 2. and connected to other components on the circuit substrate 4 through circuit wiring. The circuit substrate 4 is in thermal contact with the heat sink 3 . The power lead 7 is welded to the power input terminal 5 on the circuit substrate, and provides the required power for the light emitting diode group through the constant current driving circuit on the circuit substrate.

Fig. 2-1 is a schematic cross-sectional view of the basic structure of the integrated light emitting unit. The light guide body 2, the circuit substrate 4, and the heat sink 3 are closely installed together. The heat generated by the light-emitting diode 1 and other components in operation is conducted to the heat sink 3 through the circuit substrate 4 and the pads thereon, and is dissipated into the environment medium through its exposed surfaces 6 and 7 .

Figure 2-2 is a schematic diagram of a small basic heat sink of the integrated light emitting unit. The light emitted by the light emitting diode 1 propagates through the path shown in the light guide body 2 and exits from the larger outer surface 5 . The outer diameter of the light guide body 2 is larger than that of the heat sink, and wraps the heat sink 3 partly, and uses the inner hole surface 6 in contact with the environment medium to dissipate heat during operation.

Fig. 3 is a schematic diagram of the arrangement and distribution of light emitting diodes in the light guide.

FIG. 4 is a schematic diagram of the circuit connection relationship of the light emitting diode unit. There can be one set or multiple sets of circuits connected by this connection method on the light guide of each integrated light-emitting unit.

FIG. 5 is a schematic diagram of a heat sink with a zigzag inner hole. The inner hole is in the shape of a broken line and a curve, which is beneficial to increasing the heat dissipation area of the exposed surface of the heat sink and improving the heat dissipation performance.

Fig. 6 is a schematic diagram showing a plurality of inner holes in the heat sink. The inner hole is a plurality of small holes, which is beneficial to increase the heat dissipation area and also has the effect of preventing foreign matter from entering.

Fig. 7 is a schematic diagram of multiple stacked use of the light-emitting units shown in Fig. 2-1, wherein 1 is a power input line, which is connected to the circuit substrate of each unit, and its light-emitting surface 3 is a discontinuous surface. According to its application structure, external The surface 2 dissipates heat, and it can also dissipate heat on the inner and outer surfaces at the same time, and the number of units used is arbitrary.

Figure 8 is a schematic diagram of multiple stacked units shown in Figure 2-1. The power input ends of each unit are connected in parallel through wire 1 and connected to the power supply. The light-emitting surface 2 is a smooth, uniform and continuous light-emitting surface, and the central hole formed The channel is a heat dissipation channel, and each unit relies on the inner surface 3 to dissipate heat to the environment medium.

Claims (8)

1. an integrated light-emitting unit comprises plane light conductor, light-emitting diode, circuit substrate, constant-current circuit and a fin, it is characterized in that, a plurality of LED package distribute ringwise in light conductor inside, and the outer rim of light conductor is the outgoing plane of light.

2. integrated light-emitting according to claim 1 unit, its feature are that also described light conductor has centre bore, and its outer rim shape can be circle, ellipse, pyriform, irregular curve shape, square, rectangle, rhombus, triangle, polygon.

3. integrated light-emitting according to claim 1 unit, its feature are that also the pin of light-emitting diode is welded on the circuit substrate, and the leading foot of light-emitting diode and the coupling part of circuit substrate are perpendicular to the light conductor plane.

4. integrated light-emitting according to claim 1 unit, its feature are that also circuit substrate has at least one centre bore.

5. according to the described integrated light-emitting of claim 1-4 unit, its feature also is also to be equipped with on the circuit substrate constant-current circuit of corresponding series connection with light-emitting diode group.

6. integrated light-emitting according to claim 5 unit, its feature are that also at least one also is housed and the circuit pad keeps the fin of thermo-contact.

7. integrated light-emitting according to claim 6 unit, its feature also be fin the center or near have the hole that at least one is used to dispel the heat.

8. integrated light-emitting according to claim 7 unit, its feature also is to fit tightly between the circuit substrate, light-emitting diode, light conductor, fin of described integrated light-emitting unit, except that light output end face, heat-delivery surface, the part of power supply lead wire, can be sealing state.

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