KR101082924B1 - Traffic light using led lighting source - Google Patents

Abstract

The present invention relates to a LED light source traffic light that can be used as a traffic light by employing a plurality of high-power LED as a light source.

In order to achieve the above object, the present invention provides a copper substrate in which an LED fixing part is provided at a center and a pattern forming part is provided at the periphery thereof. A bonded LED bare chip array, a printed circuit layer having an electrode formed thereon and a circuit pattern for electrically connecting the LED bare chip connected in series and parallel to the pattern forming portion of the copper substrate and an external power supply unit, the LED bare chip array and LED light source module consisting of a transparent resin layer laminated on an outer surface of a printed circuit layer, and a resin layer outer frame fixed in a closed loop shape around the circumference of the LED fixing part to have the same height as the thickness to form the transparent resin layer. ; A heat dissipation plate fixed in surface contact with the opposite surface to which the LED bare chip is attached to the copper substrate; A reflection shade fixed to the copper substrate to reflect the light emitted from the LED bare chip to the front; It includes a case that accommodates the LED light source module, the heat sink and the reflection shade and a protective lens is installed on the front.

Traffic light, LED light source, Light emitting diode, YAG, Yag

Description

LED light source traffic light {TRAFFIC LIGHT USING LED LIGHTING SOURCE}

The present invention relates to a LED light source traffic signal using the LED as a light source, and more particularly to a LED light source traffic signal that can be used as a traffic light by employing a plurality of high-power LED as a light source.

In general, traffic lights are displayed in three colors of red, green, and orange for the sake of safe traffic order, and are a kind of apparatus for representing different traffic conditions according to color, and traffic lights made of incandescent lamps have been used for a long time.

An incandescent bulb is a filament wire that is put in a glass of vacuum and applied with power so that the filament wire is heated to a high temperature and radiates by temperature radiation.The filament gradually evaporates and becomes thinner and eventually breaks during use at high temperature. Most of the energy is emitted as heat, and only a part of it is used as light, resulting in low thermal efficiency. In addition, the traffic light of the incandescent light bulb has a problem in that the maintenance cost is high due to the large power consumption as described above and the frequent replacement of the incandescent bulb due to its relatively long life.

Therefore, a lot of traffic lights employing LED as a light source have recently been developed. A light emitting diode (LED) is a light source using a light emitting phenomenon generated when a voltage is applied to a semiconductor, and the brightness has been improved enough to be used for lighting due to technological developments over the years, and the lamp using the LED is a conventional incandescent lamp Compared to the low power consumption, long lifespan, bright and clear, and various lighting output according to color and brightness, it can be used for general lighting in various fields such as traffic lights, lighting stands, signs, flashlights and small lamps. It is a prospect.

Such LED devices are being developed and marketed as various lamps for indoor lighting while gradually evolving into higher brightness LED devices. In order to have suitable brightness when used as indoor lighting, a plurality of light emitting diode devices are arranged in a horizontal direction or a high brightness light emitting diode device. It may be used as a single light source by arranging one or a plurality of, in particular, may be further configured to reflect the light reflecting the light considering the range and efficiency to be illuminated.

In order to realize such an LED light source, it is necessary to efficiently dissipate heat generated from the LED, and to implement a point light source as much as possible while efficiently arranging and connecting a plurality of LEDs to obtain a desired brightness of illumination.

By the way, in general, the LED constituting the LED light source is to fix the LED bare chip to the lead frame and molded the LED bare chip portion of the lead frame with a transparent resin, the traffic lights are arrayed in a number of devices in the structure constituting the traffic light body Arranged and fixed in the form, and electrically connected to each other, a light emitting diode was manufactured to have a color necessary to indicate a traffic condition, or a transparent cover capable of expressing a specific color on the front surface of the light emitting diode was used.

Therefore, in order to manufacture three colors of traffic lights, there was an inconvenience of having to manufacture each color separately.

1 is an exploded perspective view showing an example of a conventional LED traffic light. Looking at the configuration of the conventional traffic light 10 through Figure 1, the light emitting diodes 11, a plurality of light emitting diodes 11, the PCB substrate 12, the light emitting diodes 11 are protected and the inflow of foreign matters A transparent front cover 13, a holder 14 fixing the front cover 13, a reflector 15 to diffuse and radiate the light emitted from the light emitting diodes 11, and to improve light efficiency, A driving circuit unit 16 for driving the light emitting diodes 11 and a case 17 for accommodating and fixing the components.

However, since the conventional traffic light 10 has a structure in which a plurality of light emitting diodes 11 composed of a single component are arranged and fixed on a PCB 12 as described above, a basic manufacturing cost is increased. In order to manufacture one signal light, a large number of light emitting diodes, such as about 260 to 432 LEDs, are required in a circular PCB having a diameter of 300 mm, depending on the brightness required by the country.

In addition, the structure for fixing the plurality of light emitting diodes as described above is complicated and the electrical supply circuit is also complicated, which leads to a lot of design difficulties.

The present invention has been invented in view of the above circumstances, and a plurality of three-color LED bare chips capable of exhibiting red, blue, and yellow colors are attached to the copper substrate in the form of an array on a copper substrate using chip bonding and wire bonding, a semiconductor manufacturing technology. An object of the present invention is to provide an LED light source traffic light that can realize a high-brightness traffic light by using the module as a light source.

In order to achieve the above object, the present invention provides a copper substrate in which an LED fixing part is provided at a center and a pattern forming part is provided at the periphery thereof. A bonded LED bare chip array, a printed circuit layer having an electrode formed thereon and a circuit pattern for electrically connecting the LED bare chip connected in series and parallel to the pattern forming portion of the copper substrate and an external power supply unit, the LED bare chip array and LED light source module consisting of a transparent resin layer laminated on an outer surface of a printed circuit layer, and a resin layer outer frame fixed in a closed loop shape around the circumference of the LED fixing part to have the same height as the thickness to form the transparent resin layer. ; A heat dissipation plate fixed in surface contact with the opposite surface to which the LED bare chip is attached to the copper substrate; A reflection shade fixed to the copper substrate to reflect the light emitted from the LED bare chip to the front; It includes a case that accommodates the LED light source module, the heat sink and the reflection shade and a protective lens is installed on the front.

The LED light source module is characterized in that the cone-shaped reflecting plate is installed in the central portion of the LED fixing portion protruding forward, LED bare chip array is disposed around the reflecting plate.

The LED bare chip of the LED light source module is characterized in that the three-color LED that can express red, green and yellow.

The traffic signal according to the present invention as described above is simple to manufacture, low production cost, and improved visibility by using a light source as an LED light source module using a LED bare chip at the time of manufacturing, as well as using an existing incandescent bulb Compared to the traffic lights that can be used longer life, there is an advantage to reduce the maintenance cost.

Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exploded perspective view of a traffic signal lamp according to an embodiment of the present invention, Figure 3 is a longitudinal sectional view of FIG. The traffic light 100 according to the present invention is an LED light source module 101, a heat sink 102 is fixed to the rear surface of the LED light source module 101, the front of the LED light source module 101 is fixed to the LED A reflection shade 103 reflecting the light emitted from the light source module 101 to the front; The case 104 accommodates the LED light source module 101, the heat sink 102, and the reflection shade 103, and is installed on the front of the case 104 to protect components installed inside the case 104 and to prevent foreign substances. It comprises a protective lens 105 to block the inflow.

The LED light source module 101 is manufactured as one light source using three-color LED bare chips as described below, and is capable of emitting red, green, and yellow light required for a traffic signal.

On the back of the LED light source module 101, a heat sink 102 for quickly dissipating heat generated from the LED light source module 101 to the atmosphere is installed.

The front of the LED light source module 101 is provided with a reflector 103 for diffusing and radiating the light emitted from the LED light source module 101 to the front to improve the light control efficiency. The reflection shade 103 is formed in a cone shape, the LED light source module 101 and the heat sink 102 is fixed to a small central portion.

On the other hand, the case 104 constituting the outer body of the traffic light 100 is made of a box-shaped opening the front, the door 104a is installed in the opening and closing manner, the door 104a is a cover groove A 104b is formed to fasten the protective lens 105. The protective lens 105 may be formed with a plurality of irregularities on the inner surface uniformly to increase the radiation angle, and may be coupled using a separate fastener 106 when coupled to the cover groove 104b.

In the above example, the protective lens 105 has been described as being fastened to the door 104a of the case 104, but the protective lens 105 may be fixed around the outer diameter of the reflector 103, and the fixing means may be a bolt. And it is possible to use a variety of fastening members, such as using a nut, screwing, or coupling the projection and the groove.

The protective lens 105 protects the components installed inside the case 14 and serves to block foreign substances from flowing into the case 104, and also consists of a transparent material glass or synthetic material LED light source module It is made to transmit the light emitted from the 101 well to the outside. In addition, preferably by forming an uneven portion on the surface of the protective lens 105 to scatter the light transmitted when the light emitted from the LED light source module 101 to the outside to secure a wide viewing angle of the traffic light (100). have.

Next will be described in detail with respect to the LED light source module according to the present invention.

4 is a perspective view of the LED light source lamp according to the present invention, Figure 5 is a cross-sectional view taken along the line A-A of FIG.

The copper substrate 10 serving as the base frame of the light source according to the present invention has a predetermined thickness, and the LED fixing portion 11 is disposed at a predetermined central portion, and the pattern is formed around the remaining portions except for the LED fixing portion 11. The forming unit 12 is disposed, and fastening grooves 13 for fixing the copper substrate 10 to the lamp body are formed at each corner of the copper substrate 10. The copper substrate 10 and the LED bare chip array described below are formed in a rectangular structure, but are not limited thereto and may be in various forms such as circular, elliptical, and rectangular, without departing from the technical spirit of the present invention. Modifications can be made to those skilled in the art.

The LED fixing chip 11 of the copper substrate 10 is equipped with an LED bare chip 11 that is a light emitter. In this case, a plurality of the LED bare chips 11 are arranged in the horizontal and vertical directions, respectively, to form the LED bare chip array 20, and are mounted on the LED fixing parts 11 of the copper substrate 10 by chip bonding.

In addition, the LED bare chips 21 are connected in series by wire bonding between adjacent bare chips in the same direction in the longitudinal or transverse direction, and the LED bare chips in which the plurality of LED bare chips 21 are connected in series. The series group is connected to the circuit patterns 31 formed on the printed circuit pattern layer 30 disposed on the upper surface of the copper substrate 10 and connected in parallel to each other to form the LED bare chip array 20. Reference numeral 22 denotes a wire connecting the LED bare chips 21 in series and connecting the LED bare chips series to the circuit pattern 31.

An electrode 14 is formed at one circumference of the copper substrate 10 to connect the LED bare chip array 20 to an external power source (not shown), and the electrode 14 is the circuit pattern 31. Is connected to.

Here, the LED bare chip series group connected in series with the number of serial connection of the LED bare chips 21 connected in series or in parallel to form an LED bare chip array is determined in consideration of the voltage to be applied to the light source to be implemented and the brightness of the light source. do.

A translucent resin layer 40 is laminated on the outer surface of the LED bare chip array 20 and the circuit pattern 31 layer to protect and fluoresce the LED bare chip array 20 and the circuit pattern 31 layer. As the light-transmissive resin layer 40 according to the present invention, YG (Yttrium Aluminum Garnet) and a silicon mixture are used. Yag emits yellow fluorescence, and as the amount of silicon mixed increases, it gradually approaches the white light source.

The light-transmissive resin layer 40 pours a liquid mixture into the outer surface of the layer of the LED bare chip array 20 and the circuit pattern 31, and then hardens them by heat treatment. The liquid mixture is mixed with the LED bare chip array. And when poured on the outer surface of the printed circuit layer and spreads out in an arbitrary form, the resin layer outer frame 41 is installed in order to prevent this and to be laminated to a predetermined height only within the required range. Therefore, the translucent resin layer 40 is formed in the resin layer outer frame 41 to be equal to the height of the resin layer outer frame 41.

The fastening grooves 13 formed at each corner of the copper substrate 10 are for fixing the copper substrate 10, which is the base frame of the LED light source lamp, to the lamp body, and are formed to penetrate up and down. In addition, the fastening grooves 13 formed at each corner of the copper substrate 10 are formed in a rectangular shape, and in particular, when formed in four corners as shown in the example, the long axis direction of the rectangular grooves is rotated by 90 degrees clockwise. Can be formed.

As described above, the forming angles of the fastening grooves 13 are different from each other by the heat generated from the LED bare chip array 20 when a heat sink (not shown) is attached to the rear surface of the copper substrate 10. Even if the substrate 10 is thermally deformed, it is to prevent the contact area with the heat sink installed on the back side from being reduced as much as possible. This is to allow the copper substrate 10 to be deformed in any direction when thermal deformation occurs, so that the forming angle of the fastening groove 13 can be formed in various ways to cope with this.

On the other hand, the forming angle of the fastening groove 13 as described above is not limited thereto, and may be variously modified according to the shape of the copper substrate 10 or the number of the fastening grooves 14 within a range capable of achieving the above object. .

  In particular, the LED bare chip 11 described above is integrally formed with an LED bare chip capable of expressing red, green, and yellow necessary for displaying traffic conditions, respectively, according to a control signal received by a conventional traffic controller. By driving the chip that can express the color of the one light source module is able to display the signals of all colors indicating the traffic conditions. Therefore, it is possible to implement signals of different colors by installing traffic lights of the same structure for different purposes and by changing software control signals without separately manufacturing traffic lights.

The LED light source lamp according to the present invention configured as described above will be described in more detail for each layer based on FIGS. 6 to 8.

6 shows a state in which the LED bare chip array 20 is mounted on a copper substrate according to the present invention. The copper substrate 10 forms a base frame of the LED light source according to the present invention. As shown, a plurality of LED bare chips 21 are provided in the LED fixing part 11 provided at the central portion of the copper substrate 10. It is connected in parallel to form an LED bare chip array (20).

In addition, rectangular fastening grooves 13 are formed in the corner adjacent portions of the copper substrate 10 so that the major axis directions of the grooves are arranged in different directions.

FIG. 7 illustrates a printed circuit board stacked on the copper substrate of FIG. 6. FIG. 7A is a diagram for describing an overall circuit pattern, and FIG. 7B is a diagram for explaining an electrolytic silver plating layer among circuit patterns. It is for the drawing.

The printed circuit pattern layer 30 according to the present invention is preferably made of a flexible circuit board on which a circuit pattern 31 of copper foil is formed on a thin synthetic resin film. In addition, the silver plating layer 32 is formed at a portion of the circuit pattern 31 to be connected to the LED bare chip 21 and a portion to be used as the electrode 14 as shown in FIG. The silver plating layer 32 is formed by nickel plating the circuit pattern 31 of the copper foil, as is well known in order to smoothly silver plating. The reason for forming the silver plating layer 32 as above is that copper is easily oxidized, so it is not easily soldered, thereby facilitating wire bonding with the LED bare chip 21, and the electrode 14 later on the external power supply unit. This is to ensure good connection with the wires to be connected. The silver plating layer 32 is formed by electroplating. The silver plating layer 32 may achieve the same effect even when formed of a soft gold layer.

FIG. 8 is a perspective view of a resin layer outer frame, wherein the resin layer outer frame 41 is formed to have a size surrounding the LED bare chip array 20 and the circuit pattern 31, and the number of light-transmitting to be formed. It is formed to a height corresponding to the height of the ground layer (40). The resin layer outer frame 41 is preferably formed of a synthetic resin material. In addition, a reflective layer 42 is formed on the inner surface of the resin layer outer frame 41. This is to emit the light emitted from the LED bare chip 21 to the outside as possible, for this purpose, the inner surface of the resin layer outer frame 41 is preferably formed to be inclined from the inside to the outside.

Meanwhile, as illustrated in FIG. 9, the electrode 14 is connected to an external power supply unit (not shown) through the converter 110 through the LED light source module 101. The converter 110 converts the power supplied from the external power supply unit into the power required by the LED light source module 101. It is preferable to use a Teflon wire (not shown) in consideration of the heat generated from the LED bare chip array 20 as the connection means.

10 is a view showing another embodiment of the LED light source module used in the present invention, Figure 11 is a cross-sectional view taken along the line B-B of FIG.

The LED light source module 201 shown in FIGS. 10 and 11 is a cone-shaped reflecting plate 50 is further installed as compared to the LED light source module 101 shown in FIG.

That is, a conical reflector 50 is installed at the center of the LED fixing portion 11 of the copper substrate 10, and the LED bare chip array 20 including a plurality of LED bare chips 21 around the reflector 50 is provided. ) Is placed. The reflector 50 emits heat to the outside in consideration of the concentration of heat in the central portion of the LED bare chip array 20.

In addition, light emitted from the LED bare chips 21 installed around the reflector 50 is reflected by the reflector 50 at a predetermined angle so as to be radiated to the outside. As a result, the light generated from the LED light source lamp is radiated in a widely diffused state, thereby allowing a wider range of light to be emitted.

The reflecting plate 50 has a flange 51 having a predetermined size formed around the conical reflecting plate so that the reflecting plate 50 can be smoothly fixed to the copper substrate 10.

Since the reflecting plate 50 is fixed to the copper substrate 10 by pouring a liquid resin into the resin layer outer frame 41 to harden to form the transparent resin layer 40, the flange 51 of the reflecting plate 50 is It is embedded in the translucent resin layer 40.

In addition, the reflective plate 50 formed in a conical shape may be formed in a hollow shape, and a through groove 10a may be formed in the copper substrate 10 corresponding to the bottom surface of the reflective plate 50. The through groove 10a communicates the inner space of the reflector 50 with the outside air so as to emit heat absorbed when reflecting the light emitted from the LED bare chip 21 to the outside.

The traffic light according to the present invention configured as described above is simple to manufacture the traffic light by adopting a light source module using the LED bare chip, can reduce the manufacturing cost and can provide a traffic light with improved brightness efficiency. have.

In addition, it is possible to replace the light source module according to the embodiment of the present invention to the existing traffic lights, so that the existing incandescent lamp-type traffic lights can be easily replaced with the traffic light using the LED light source to replace the existing traffic light LED light source. It is possible to reduce the cost of changing traffic lights.

Furthermore, the LED light source module of the traffic light according to the present invention uses a three-color LED bare chip that can represent red, green, and yellow, so that the traffic light of the red, green, and yellow colors is usually not separately manufactured. The traffic lights are made simple by software control signals, which are displayed in colors representing different traffic conditions.

1 is an exploded perspective view showing an example of a conventional LED traffic light,

2 is an exploded perspective view of a traffic light according to an embodiment of the present invention;

3 is a longitudinal cross-sectional view of FIG.

4 is a perspective view of an LED light source lamp according to the present invention;

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a view showing a state in which the LED bare chip array is mounted on the copper substrate of the LED light source module according to the present invention,

7 is a view illustrating a printed circuit board laminated on the copper substrate of FIG. 6;

8 is a perspective view of a resin layer outer frame laminated on the copper substrate of FIG. 6;

9 is a power circuit diagram of the LED light source module according to the present invention;

10 is a view showing another embodiment of the LED light source module used in the present invention,

FIG. 11 is a cross-sectional view taken along the line B-B in FIG. 10. FIG.

<Description of the symbols for the main parts of the drawings>

10-copper substrate, 11-LED fixing,

12-pattern forming part, 13-fastening groove,

14-electrode, 20-LED bare chip array,

21-LED bare chip, 22-wire,

30-printed circuit pattern layer, 31-circuit pattern,

40-translucent resin layer, 41-resin layer outer frame,

100-traffic light, 101-LED light source module,

102-heat sink, 103-reflector,

104-Case, 105-Protective Lens.

Claims (3)

A copper substrate having an LED fixing part at a center and a pattern forming part at the periphery thereof, an LED bare chip array arranged vertically and horizontally on the LED fixing part of the copper substrate, and wire bonded in parallel and parallel to each other, the copper substrate of the A printed circuit layer having an electrode and a circuit pattern for electrically connecting between the LED bare chip connected in series and in parallel with a pattern forming unit and an external power supply unit, and a transmissive number stacked on an outer surface of the LED bare chip array and the printed circuit layer. An LED light source module comprising a resin layer outer frame fixed in a closed loop shape over the entire circumference of the LED fixing part to have a ground layer and a height equal to a thickness for forming the light-transmissive resin layer; A heat dissipation plate fixed in surface contact with the opposite surface to which the LED bare chip is attached to the copper substrate; A reflection shade fixed to the copper substrate to reflect the light emitted from the LED bare chip to the front; LED light source traffic light, characterized in that made; including the LED light source module, the heat sink and the reflector to receive a protective lens is installed on the front. The LED light source traffic light of claim 1, wherein the LED light source module has a conical reflector having a vertex protruding forward from the center of the LED fixing part, and an LED bare chip array is disposed around the reflector. The LED light source traffic light of claim 1 or 2, wherein the LED bare chip of the LED light source module is a three-color LED capable of expressing red, green, and yellow.

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