JP2017162626A - Light-emitting diode headlamp integrally incorporated with led lighting circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting diode headlamp capable of efficiently releasing heat occurring at a light-emitting diode, simultaneously releasing heat generated in a lighting circuit, and facilitating assembly/disassembly with compact constitution.SOLUTION: A lighting circuit incorporated type light-emitting diode headlamp includes: a metal heat conductive rod 4 having a metal heat conductive plane to which a substrate circuit mounted with a light-emitting diode 2 is fixed; a mouthpiece 5 fitting the metal heat conductive rod 4 having the heat conductive plane; and a metal heat radiation pedestal 6 in which a central part has a cavity part through the mouthpiece 5, wherein a heat radiation fan 8 and circuit case 9 for lighting circuit and for motor drive are incorporated into the cavity part.SELECTED DRAWING: Figure 2

Description

  The present invention integrally incorporates a case in which a LED lighting circuit (driver circuit) for supplying a stable current and voltage to a light emitting diode is miniaturized and stored in a light emitting diode headlamp, and particularly a light emitting diode headlamp. It's about a compact headlamp.

  In recent years, light-emitting diode headlamps are favorably used because of their low power consumption, high brightness, and low heat dissipation. The light emitting diode requires a lighting circuit as a driver. Conventionally, the light emitting diode headlamp and the lighting circuit case are separate members, and these are connected to each other through a connector or the like by an electric wire.

In Patent Document 1, a genuine lamp attached to an existing headlight case can be easily replaced with an LED lamp, and the LED lamp is formed from a heat insulating material for the purpose of stably lighting the LED lamp. A flange that is detachably mounted on an existing headlight case, an LED module that is composed of a plurality of LEDs and is fixed to one surface of the flange, and a power supply voltage that is fixed to the flange and is output from the battery to a predetermined lamp And a lighting device that converts the voltage into a voltage and supplies power to the LED module.

Patent Document 2 states that in paragraph [0037] of the specification, “a light-emitting element is configured such that a power supply connector can be inserted into and removed from the front side of the bracket at a connector insertion opening that opens in front of the LED assembly case. On the lower surface of the lamp body, there is provided a lighting circuit unit that accommodates and integrates a circuit for controlling the lighting of the light emitting elements in each of the lamps A, B, and C, and is introduced from the lighting circuit unit into the lamp chamber. The power supply cord extends to the light emitting elements of the lamps A, B, and C. ”

Patent Document 3 states that “a semiconductor substrate on which a light-emitting diode is mounted is fixed in order to provide a low-power, high-power, long-lifetime, simple structure, compact lighting and vehicle headlamp. The aluminum plate is directly fixed to the copper heat conduction rod, and the heat conduction rod portion of the copper heat conduction rod is formed so as to form the light shielding wall A and the light shielding wall B except for the heat conduction rod portion of the fixed aluminum plate portion. A light source support connected by a copper heat conduction rod consisting of an upper structure whose surface is covered with aluminum to reach the base and a lower structure having a long copper heat conduction rod is connected to the base by a long copper heat conduction rod. The copper heat conduction rod is fixed to the position where the tip of the copper heat conduction rod penetrates deeply into the cavity, and is fitted with the aluminum heat dissipation pedestal having a hollow in the center via the air. Luminescence by cooling The heat generated from the diode is described as escape in an aluminum base. "
However, none of the documents disclose that a lamp using a light emitting element and a lighting circuit are integrally cooled.
The LED headlamp to which the present invention can be suitably applied is typically a high-intensity LED headlamp disclosed in Patent Documents 4 to 8, but is not limited to this. The headlamp that lowers the LED temperature by heat conduction or heat radiation can be widely applied.

JP 2010-192210 A JP 2007-35547 A Japanese Patent No. 5559386 Japanese Patent No. 5846691 Japanese Patent Application No. 2014-211251 Japanese Patent Application No. 2014-211252 Japanese Patent Application No. 2015-44092 Japanese Patent Application No. 2015-44100

Conventionally, a headlamp using a light emitting diode and a lighting circuit are separate members and are connected by electric wires. The cooling method for each was also done separately.
Therefore, the electric wires are longer than necessary, and the electric wires are intricately intertwined during assembly and disassembly, which is very inconvenient.

In order to solve the above problems, the present inventor efficiently releases the heat generated in the light emitting diode, and also releases the heat generated by the lighting circuit at the same time, so that the light emitting diode headlight that facilitates assembly and disassembly at the same time is made compact. I came to find the light.

The present invention uses a light-emitting diode to dissipate heat generated from the light-emitting diode, a metal heat-conducting rod having a metal heat-conducting plane to which a substrate circuit on which the light-emitting diode is mounted is fixed, and the heat-conducting plane Having a base fitted with a metal heat conducting rod having a metal, a metal heat dissipating pedestal having a hollow portion through the base, a cooling fan and a lighting circuit case in the hollow portion, A lighting circuit-embedded light emitting diode headlamp, wherein a housing case that houses a lighting circuit for lighting the light emitting diode in a lower portion of the cooling fan in the hollow portion is incorporated in the hollow portion.
Further, in the lighting circuit built-in type light emitting diode headlamp according to the present invention, the metal heat dissipating pedestal is formed of a two-stage cylindrical body having a narrow portion for receiving a base and a thick hollow portion, and the outer periphery of the cylinder is a groove. The cooling fan can be driven by a small motor.
Furthermore, in the light-emitting diode headlamp with a built-in lighting circuit according to the present invention, the metal heat conduction plane to which the substrate circuit on which the light-emitting diode is mounted is fixed is a part of the metal heat conduction rod, and the heat conduction rod And a position where the tip of the heat conduction rod penetrates into the cavity portion, and a metal heat radiation base having a hollow portion through the die. The light-emitting diode headlamp fitted and fixed to the heat dissipation base.
Further, in the lighting circuit built-in type light emitting diode headlamp according to the present invention, the metal heat conduction plane to which the substrate circuit on which the light emitting diode is mounted is fixed is a flat body of the heat pipe, and is integrated with the flat body. The part where the heat pipe fits into the base is cylindrical, and the heat pipe is a light-emitting diode headlamp that is fitted and fixed to a metal heat radiating base having a hollow part at the center through the base. is there.
Furthermore, in the lighting circuit built-in type light emitting diode headlamp according to the present invention, the lighting circuit incorporates a DC-DC converter for boosting the voltage from the battery to a predetermined voltage for lighting the light emitting diode. I can do it.
Further, in the lighting circuit built-in type light emitting diode headlamp according to the present invention, the heat radiating base is made of aluminum, the heat conducting rod or the heat pipe is made of copper, and the lighting circuit storage case is made of synthetic resin. Can be made with.
Furthermore, in the lighting circuit-embedded light-emitting diode headlamp of the present invention, the lighting circuit storage case may have a circular or square cross section of the central axis.
Further, in the lighting circuit built-in type light emitting diode headlamp according to the present invention, the lighting circuit storage case and / or the cooling fan can be detachably attached to and removed from the radiating base with an elastic locking member.

In the present invention, the case of the light emitting diode headlamp and the lighting circuit is incorporated in the heat dissipation pedestal, so the whole is compact, and the cooling fan of the light emitting diode cools the lighting circuit at the same time and gives a synergistic effect, as well as assembly and disassembly. The light emitting diode part, cooling fan part, and lighting circuit case part are detachable via a small connector, so they are easy to assemble and disassemble, and they are functional and beautiful.
Since cooling is also performed at the same time, the cooling efficiency can be increased.

The front view of the present invention Is an axial sectional view of the present invention. These are the figures which decomposed | disassembled the cooling fan and the lighting circuit from the light emitting diode headlamp. These are figures which connect a light emitting diode and a cooling fan to the case of a lighting circuit via a connector. Is an example of a DC-DC converter of a lighting circuit that feeds power from a battery by boosting a voltage to a light emitting diode.

FIG. 1 is a front view of the present invention.
A light emitting diode 2 is used for a headlight or fog light of a vehicle headlamp. Reference numeral 3 denotes an aluminum plate or a copper plate having good thermal conductivity, and is fixed to the heat conducting rod 4 by an adhesive, brazing, or screws through a semiconductor substrate on which a light emitting diode is mounted. The heat conducting rod 4 is preferably made of copper having good heat conductivity, but materials such as aluminum, iron, and silver may be used.

The heat conduction rod 4 is composed of a light-shielding portion at the tip portion, a flat portion at the rear in the axial direction thereof, and a rod-shaped main body portion at the rear thereof, and the rod-shaped main body portion is hollow so as to pass an electric wire for supplying power to the light emitting diode. The light emitting diode 2 is fixed to the flat part of the heat conducting rod 4 through an aluminum plate or a copper plate. The power supply line of the light emitting diode extends from the semiconductor substrate and is connected to the other connector terminal of the lighting circuit case 9 by the connector 18 through the hollow portion of the heat conducting portion 4 as will be described later.
As is apparent from FIG. 2, the heat conducting rod 4 is formed by fitting a base 5 and a heat dissipating pedestal 6, and the rear end portion of the heat conducting rod protrudes into the space of the heat dissipating pedestal 6. This is for efficient heat dissipation.

In order to dissipate heat, the heat dissipating base 6 is provided with a large number of slits or fins 11 parallel to the axial direction on the circumference thereof. A heat radiating fan 8 is provided in the space of the heat radiating base, and a lighting circuit case 9 is provided behind the fan.
This heat radiating fan not only cools the rear end portion of the heat conducting rod, but also cools the lighting circuit case 9.
Therefore, the fan case opens axially forward and axially rearward, the driving motor 16 and the fan 17 driven by the motor 16 are placed on the struts bridged to both ends of the case, and the front and rear are simultaneously opened by the fan. A cooling structure is preferable. The drive motor is attached, for example, in the middle of the bridge-like mount 16 ′.
The lighting circuit case 9 is preferably made of a synthetic resin having good thermal conductivity, but may be made of metal.

For example, the case 8 of the heat dissipating fan 17 is provided with elastic locking pieces 13 at two to four positions on the outer peripheral portion thereof so that it can be easily attached to and detached from the locking holes 12 of the heat dissipating base. is there. The lighting circuit case 9 is also provided with 2 to 4 elastic locking pieces 15 which are detachably attached to the heat dissipating pedestal so that they can be easily attached and detached. Concave portions 13 ′ and 15 ′ into which the elastic locking pieces 13 and the elastic locking pieces 15 are fitted can be provided around the cavity of the heat radiating base 6.

FIG. 4 shows that the connector 18 connected to the tip of the power supply wire 7 of the light emitting diode 2 and the connector 14 connected to the fan driving motor are connected to the other connector terminals 19 and 20 provided in the lighting circuit case. The heat radiating fan 8 and the lighting circuit case 9 are incorporated in the heat radiating base.
By doing in this way, when incorporating a heat radiating fan and a lighting case into the heat radiating base, the electric wires can be easily made smooth without being intertwined in a complicated manner. Furthermore, a bottom lid 22 can be provided. The bottom cover 22 can also be locked by providing irregularities on the inner periphery of the cavity of the heat radiating base 6.

FIG. 5 shows an example of a voltage booster circuit of the lighting circuit. Various circuits are assumed without being limited to this.
FIG. 5 will be described. The current input from Vin is connected to the ground by the switching element FET1 through the inductance L1. The inductance L1 is grounded via the diode D1 and the conductance C1. The diode D1 is connected to the other switching element FET2, its output is connected to the inductance L2 and the diode D2, and the other end of the diode D2 is grounded. The inductance L2 is grounded via the conductance C2 and is output as Vout. The switching elements FET1 and FET2 are controlled to be turned on and off by the control unit 30, and boosted by Vout by the LC circuit.

The light-emitting diode headlamp of the present invention is suitable for all fields of vehicle headlamps, and has a wide range of use, so that it is extremely useful in industry.

2 ... Light-emitting diode 3 ... Aluminum plate 4 ... Thermal conduction rod 5 ... Base 6 ... Radiation base 7 ... Electric wire 8 ... Radiation fan 9 ... Lighting circuit and Motor driving circuit case 10 ... electric wire 11 ... radiating fin 12 ... connector 13 ... elastic locking piece 13 '... concave portion 14 for stopping the elastic locking piece ... connector (for motor driving) )
15 ... elastic locking piece 15 '... concave 16 for stopping the elastic locking piece ... small motor 16' ... small motor mounting portion 17 ... rotary fan 18 ... connector (for LED lighting) )
19... 14 and connector 20... 18 connector 22... Bottom cover 30.
L1, L2 ・ ・ ・ Inductance
C1, C2 ... conductance
FET1, FET2 ・ ・ ・ Switching element
Vin ... Input
Vout ・ ・ ・ Output

Claims (8)

Using a light emitting diode, in order to dissipate heat generated from the light emitting diode, a metal heat conduction rod having a metal heat conduction plane to which a substrate circuit on which the light emitting diode is mounted is fixed, and a metal having the heat conduction plane A base having a heat conduction rod fitted therein, a metal heat dissipating pedestal having a hollow portion at the center via the base, a cooling fan and a lighting circuit case in the hollow portion, and in the hollow portion A lighting circuit built-in type light emitting diode headlamp, wherein a housing case containing a lighting circuit for lighting the light emitting diode is installed in the cavity under the cooling fan. The metal heat dissipating pedestal is composed of a two-stage cylindrical body with a thin part for receiving a base and a thick hollow part, and the outer periphery of the cylinder has groove-shaped heat dissipating fins or slits, and the cooling fan is a small motor 2. The lighting circuit-embedded light-emitting diode headlamp according to claim 1, wherein the lighting circuit-embedded light-emitting diode headlamp is driven by.
The metal heat conduction plane to which the substrate circuit on which the light-emitting diode is mounted is fixed is a part of the metal heat conduction rod, and the center portion is hollow through the die with the heat conduction rod fitted thereto. The heat conduction rod is fitted into a metal heat radiation pedestal that is a part, and the heat conduction rod is fitted and fixed to the heat radiation pedestal at a position where the tip of the heat conduction rod enters the cavity. A light emitting diode headlamp with a built-in lighting circuit described in 2. The metal heat conduction plane to which the substrate circuit on which the light emitting diode is mounted is fixed is a flat body of the heat pipe, and the portion where the heat pipe integrated with the flat body is fitted to the base is cylindrical, The lighting circuit built-in type light emitting diode headlamp according to claim 1 or 2, wherein a heat pipe is fitted and fixed to a metal heat radiating base having a hollow portion at a center portion through the base. The lighting circuit built-in type according to any one of claims 1 to 4, wherein the lighting circuit incorporates a DC-DC converter for boosting a voltage from the battery to a predetermined voltage for lighting the light emitting diode. Light emitting diode headlamp. The heat dissipation base is made of aluminum, the heat conducting rod or the heat pipe is made of copper, and the storage circuit storage case is made of synthetic resin. Light-emitting diode headlamp with built-in lighting circuit. The lighting circuit built-in light-emitting diode headlamp according to claim 1, wherein the lighting circuit storage case has a circular or square cross-section at the central axis. The lighting circuit according to any one of claims 1 to 7, wherein the storage case and / or the cooling fan that stores the lighting circuit can be detachably attached to and detached from the radiating base with an elastic locking member. Built-in light-emitting diode headlamp.

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