JP2010086750A - Lamp device and illumination fixture - Google Patents

Abstract

【Task】
Provided are a lamp device having a cylindrical body in which temperature reduction of a light emitting element is improved, and a lighting fixture in which the lamp device is disposed.
[Solution]
The lamp device 1 includes a substrate 2 on which a light emitting element 6 is disposed, a heat conductor 3 on which the substrate 2 is attached to the inner surface of one end side 3 a, and heat dissipation provided on the other end side 3 b of the heat conductor 3. The cylindrical body 5 in which the means 4 and the one end side 5a are not in contact with the substrate 2 and the heat conductor 3, and the other end side 5b is fixed to the other end side 3b of the heat conductor 3, and one end A cover 11 having a base 13 on the side 12a and a lighting circuit 7 for lighting the light emitting element 8 are provided.
[Selection] Figure 1

Description

  The present invention relates to a lamp device using a light emitting element and a lighting fixture provided with the lamp device.

  Conventionally, in a lamp device that can be used as an alternative to a light bulb and uses a light emitting diode (LED) as a light emitting element, a substrate provided with an LED is attached to a metallic radiator, and a base is attached to the radiator through a cover. The lighting circuit for lighting the LED was housed in the cover.

In such a lamp device, the temperature of the LED rises due to the heat generated from the LED, and the lifetime of the LED is shortened as the light output of the LED is lowered. Therefore, it is required to suppress the temperature rise of the LED. Moreover, the temperature reduction of the circuit component of the lighting circuit which lights LED is also calculated | required from a viewpoint of ensuring reliability. For this reason, what has provided a plurality of radiating fins around a radiator etc. is proposed (for example, refer to patent documents 1).
JP 2007-48638 A (page 4, Fig. 1-2)

However, some lamp devices are provided with a reflector (cylindrical body) that controls the emitted light from the LED, and heat is transferred through this reflector, so that heat tends to be trapped inside. There is a problem in that the heat of the LED cannot be efficiently guided to the low-temperature side radiation fin, and the heat radiation from the radiation fin cannot sufficiently suppress the temperature rise of the LED.
An object of this invention is to provide the lamp device which has a cylindrical body with which the temperature reduction of a light emitting element is improved, and the lighting fixture which arrange | positions this lamp device.

The invention of the lamp device according to claim 1 is a substrate on which a light emitting element is disposed; and the substrate is attached to the inner surface on one end side, and the outer surface is spread from one end side to the other end side. A conductor; heat dissipating means provided on the other end side of the heat conductor; one end side and the other end side are formed in a cylindrical shape, and one end side is not in contact with the substrate and the heat conductor. A cylindrical body having the other end fixed to the other end of the heat conductor; a cover having a base on one end and the other end attached to one end of the heat conductor; And a lighting circuit for turning on the light emitting element.
In the present invention and each of the following inventions, each configuration is as follows unless otherwise specified.
A light emitting element is solid light emitting elements, such as a light emitting diode (LED) and organic EL, for example.
For example, the substrate may be an LED module formed of a metal material including aluminum (Al) having good thermal conductivity and provided with a plurality of LEDs.

  The heat conductor may be formed of, for example, a metal material containing aluminum (Al) with good thermal conductivity, or may be formed of ceramic with good heat dissipation. In short, any material that can conduct heat or has excellent heat dissipation is acceptable. The outer surface may be a continuous curved surface having no unevenness such as a heat radiating fin in the circumferential direction. Moreover, you may have an uneven | corrugated heat dissipation structure also in the outer surface expanded toward the other end side from the one end side of a heat conductor, for example.

The heat dissipating means is, for example, a plurality of heat dissipating fins, and is disposed radially on the other end side of the heat conductor, and light from the light emitting element passes through the inner space. The heat radiating means may be formed separately from the heat conductor and combined, or may be formed integrally with the heat conductor.
The cover is formed of, for example, an insulating synthetic resin.
For example, a base that can be connected to a socket for a light bulb such as an E26 type is used.
The lighting circuit supplies, for example, a constant current DC power source to the LED.

  The cylindrical body is disposed inside the heat conductor so as to surround the substrate, and reflects light from the light emitting element. The other end of the cylindrical body may be directly attached to the other end of the heat conductor, and indirectly attached to the heat conductor by being fixed to the heat conductor or other member attached to the heat dissipation means. May be attached.

According to the present invention, one end side of the cylindrical body is not in contact with the substrate and the heat conductor, and heat from the light emitting element and the substrate is not easily transferred to the cylindrical body, and the temperature of the cylindrical body is excessively increased. Therefore, it is difficult for heat to be trapped in the inner space of the cylindrical body, and the temperature rise of the light emitting element facing the inner space is suppressed. On the other hand, the heat of the light emitting element and the substrate is mainly transferred to the heat conductor and released from the outer surface of the heat conductor and the heat radiating means to the external space.
The invention of the lamp device according to claim 2 is the lamp device according to claim 1, characterized in that the heat conductor is coated with a heat-absorbing paint on the inner surface thereof.
The heat absorbing paint may be applied to a part of the inner surface of the heat conductor or may be applied to the entire inner surface.
The heat absorbing paint is, for example, aluminum nitride (AlN) or alumina (Al ₂ O ₃ ).
According to the present invention, the heat in the internal space of the heat conductor is absorbed by the heat conductor and released from the outer surface of the heat conductor and the heat radiating means to the external space.

  The invention of a lamp device according to claim 3 is the lamp device according to claim 1 or 2, wherein the heat conductor is coated with a heat-radiating paint on the outer surface thereof.

  The heat-radiating paint referred to here is the aforementioned heat-absorbing paint. Since the transfer of heat is a radiation phenomenon, it flows from the high temperature part to the low temperature part. Since the heat radiation paint (heat absorption paint) is a material for promoting this radiation phenomenon, heat radiation is promoted when applied to a high temperature portion, and absorption is promoted when applied to a low temperature portion.

  According to the present invention, the heat transferred from the substrate to the heat conductor and the heat absorbed by the heat conductor from the internal space are quickly dissipated from the outer surface of the heat conductor to which the heat-radiating paint is applied.

The invention of the lighting fixture according to claim 4 is a lamp device according to any one of claims 1 to 3, wherein the fixture main body; a lamp socket disposed in the fixture main body; and a base is mounted on the lamp socket. And characterized by comprising:
The lighting fixture may be indoor or outdoor.
According to the present invention, since the lamp device according to any one of claims 1 to 3 is provided, there is provided a lighting fixture in which the temperature reduction of the light emitting element is improved.

  According to the first aspect of the present invention, since the one end side of the cylindrical body is disposed in a non-contact state with the substrate and the heat conductor, the temperature reduction of the light emitting element is improved, so the lamp device having the cylindrical body Even in this case, it is possible to prevent the light output of the light-emitting element from decreasing and the life from being shortened.

  According to the invention of claim 2, the heat conductor is coated with a heat-absorbing paint on the inner surface thereof, absorbs heat in the inner space, and is released from the outer surface of the heat conductor and the radiating fin body to the outer space. Therefore, the temperature rise on the one end side of the cylindrical body can be further reduced, the temperature reduction of the light emitting element can be further improved, and the light output and the short life of the light emitting element can be further prevented.

  According to the invention of claim 3, the heat conductor is coated with a heat-radiating paint on the outer surface thereof, and the heat transferred from the substrate and the heat absorbed from the inner space are quickly transferred from the outer surface of the heat conductor to the outer space. Since the emission is performed, the temperature increase on the one end side of the cylindrical body can be further reduced, the temperature reduction of the light emitting element can be further improved, and the light output and the short life of the light emitting element can be further prevented.

  According to the invention of claim 4, since the lamp device according to claim 1 or 3 is provided, it is possible to provide a luminaire in which a long-life lamp device having a cylindrical body is disposed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described.
FIG. 1 is a partially cutaway side view of a lamp device showing a first embodiment of the present invention.
The lamp device 1 includes a substrate 2, a heat conductor 3, a heat dissipating fin body 4 as a heat dissipating means, a tubular body 5, a cover 6, and a lighting circuit 7.

  The lamp device 1 includes an LED module 9 including a substrate 2 and a light emitting diode 8. The LED module 9 is attached to the inner surface of one end side 3a of the heat conductor 3 in the lamp axis direction, and the annular heat dissipating fin body 4 is attached to the other end side 3b of the heat conductor 3. The cylindrical body 5 and the translucent plate 10 are attached to. The outer cover 11 and the inner cover 12 as the cover 6 are attached to one end side 3 a of the heat conductor 3, the base 13 is attached to one end side 12 a of the inner cover 12, and the lighting circuit 7 is located inside the inner cover 12. Contained.

  The board | substrate 2 is formed in the substantially disc shape, for example, and mounts the light emitting diode (LED) 8 as several light emitting elements provided in one surface. The substrate 2 is formed of a metal material such as aluminum (Al) having good thermal conductivity, for example. The other surface of the substrate 2 is tightly fixed so as to be in surface contact with the heat conductor 3. For fixing the substrate 2 to the heat conductor 3, a silicone-based adhesive or screw having excellent heat transfer properties is used.

  The light emitting diode 8 includes, for example, a bare chip (not shown) that emits blue light and a resin part (not shown) formed of silicone resin or the like that covers the bare chip, and is excited by a part of the blue light emitted by the bare chip in the resin part. Thus, a phosphor that mainly emits yellow light that is a complementary color of blue is mixed, and each light emitting diode 8 is configured to obtain white illumination light.

  The heat conductor 3 is made of, for example, a metal material having good heat conductivity, such as aluminum (Al). That is, it is formed of a metal material having a thermal conductivity of 150 W / mK or more, for example, 236 W / mK. The heat conductor 3 is formed with a flat disk-shaped substrate mounting portion 14 on one end side 3a thereof, and is expanded so as to open from the peripheral edge of the substrate mounting portion 14 toward the other end side 3b. A diameter portion 15 is formed. The outer surface of the enlarged diameter portion 15 is a smooth surface without unevenness and is formed as a curved surface that is continuous in the circumferential direction.

  On the outer surface on the other end side of the enlarged diameter portion 15, an instrument mounting portion 16 is formed so as to protrude over the circumference. On the other end face of the enlarged diameter portion 15, an annular groove portion 18 is formed in which an annular packing 17 that makes liquid-tight contact with the radiating fin body 4 is disposed.

  The heat conductor 3 is coated with a heat-absorbing paint (not shown) on a part or the entire surface of the inner surface 3c. For example, the heat-absorbing paint is obtained by applying a coating liquid mainly composed of aluminum nitride (AlN) to the inner surface 3c of the heat conductor 3 by spraying or brushing, and then baking the heat conductor 3 at 300 to 500 ° C. Formed.

  The heat conductor 3 is coated with a heat radiating paint (not shown) on the outer surface 3d thereof. This heat-radiating paint is the same as the heat-absorbing paint. Like the heat-absorbing paint, for example, a coating liquid mainly composed of aluminum nitride (AlN) is sprayed or brushed on the outer surface 3d of the heat conductor 3. After coating, the thermal conductor 3 is formed by firing at 300 to 500 ° C.

  The heat radiating fin body 4 as the heat radiating means is made of a metal material such as aluminum (Al) having good heat dissipation. The radiating fin body 4 has an annular base portion 19 joined to the end face of the heat conductor 3, and an opening portion 20 through which light from the light emitting diode 8 passes is formed on the center side of the base portion 19. A plurality of radiating fins 21 are formed radially.

The radiating fins 21 are formed radially at substantially equal intervals in the circumferential direction of the base portion 19, and a gap 22 is formed between the radiating fins 21. The gaps 22 between the heat radiation fins 21 are respectively opened toward the other end side of the lamp device 1, that is, the front side and the periphery. The corner portion on the other end side of the radiation fin 21 is chamfered.
A cylindrical body attaching portion 23 for attaching the cylindrical body 5 and the translucent plate 10 in a liquid-tight manner is formed on the inner periphery of the base portion 19.

  The cylindrical body 5 is a reflector, and is formed, for example, in a cylindrical shape that opens in the lamp axis direction, that is, with one end side 5a and the other end side 5b open, using a metal material or a resin material. The flange portion 24 is formed so as to expand from the one end side 5 a toward the other end side 5 b, and the flange portion 24 attached to the cylindrical body attaching portion 23 of the radiating fin body 4 is formed on the other end side 5 b. The cylindrical body 5 has one end side 5a facing the LED module 9 and does not come into contact with the LED module 9 (substrate 2) and the substrate mounting portion 14 of the heat conductor 3, and the flange portion 24 has a radiation fin body. 4 is fixed to the cylindrical body mounting portion 23. On the inner surface of the cylindrical body 5, a reflection surface 25 that reflects the light of the light emitting diode 8 toward the light transmitting plate 10 is formed.

  The translucent plate 10 is formed, for example, in a disc shape using glass or a resin material, and the peripheral edge thereof is liquid-tightly attached to the cylindrical body attachment portion 23 of the radiating fin body 4 via a packing (not shown). A film 26 is attached to the front surface of the translucent plate 10.

  The outer cover 11 is formed of a metal material or a resin material into a conical shape that is continuous with the heat conductor 3. On the end face on the other end side of the outer cover 11, an annular groove portion 28 is formed in which an annular packing 27 that makes a liquid-tight contact with the heat conductor 3 is disposed. The outer cover 11 is fixed to the heat conductor 3 by screwing screws 29 from the heat conductor 3.

  Further, the inner cover 12 is formed in a cylindrical shape along the inner surface shape of the outer cover 11 from an insulating resin material such as polybutylene terephthalate (PBT) resin, and one end side 12a protrudes from the outer cover 11. A base 13 is attached, and the other end side 12 b is fixed to the other end side 3 b of the heat conductor 3.

  The base 13 is, for example, an E26 type, and includes a cylindrical shell 30 having a thread and an eyelet 32 provided on the top of the other end of the shell 30 via an insulating portion 31. The shell 30 and the eyelet 31 are electrically connected to the lighting circuit 7 by lead wires (not shown).

  The lighting circuit 7 is electrically connected to the substrate 2 of the LED module 9 by a lead wire (not shown) and is formed so as to supply a constant current to the light emitting diode 8.

The lamp device 1 configured as described above is disposed in, for example, an outdoor lighting fixture 33 having a waterproof function. The lighting fixture 33 includes a fixture main body 34 and a lamp socket 35 disposed in the fixture main body 34. The instrument body 34 is formed in a cylindrical shape having an opening on one end surface. In the lamp device 1, the base 13 is attached to the lamp socket 35, and the appliance mounting portion 16 of the heat conductor 3 is attached in a liquid-tight manner to the appliance main body 34 via the packing 36. And in the state which attached the lamp device 1 to the instrument main body 34, the radiation fin 21 of the radiation fin body 4 protrudes outside from the end surface of the other end side of the instrument main body 34.
Next, the operation of the first embodiment of the present invention will be described.

  When power is supplied from the lamp socket 35 of the lighting fixture 33 to the lamp device 1, the lighting circuit 7 operates to supply power to the substrate 2 of the LED module 9, and each light emitting diode 8 is lit (emits light).

  A part of the light from each light emitting diode 8 is directly directed to the light transmitting plate 10, a part of the light is reflected by the cylindrical body 5, is directed to the light transmitting plate 10, passes through the light transmitting plate 10, and is emitted to the external space. Is done.

  The heat generated by lighting each light emitting diode 8 is mainly transmitted from the substrate 2 to the heat conductor 3, transmitted from the heat conductor 3 to the radiating fin body 4, and further from the cylindrical body 4 to the radiating fin body 4. And is radiated from the plurality of radiating fins 21 of the radiating fin body 4 into the air outside the lighting fixture 33.

  Since the cylindrical body 5 is not in contact with the substrate mounting portion 14 of the substrate 2 and the heat conductor 3 at one end side 5a, the generated heat of the light emitting diode 8 is generated more than the cylindrical body 5 is in contact. 5 is less likely to transfer heat, and the temperature rise on the one end side 5a of the cylindrical body 5 is suppressed.

  And the cylindrical body 5 interrupts | blocks the heat from the light emitting diode 8, and has prevented that the said heat | fever radiates | emits directly to the inner surface 3c of the heat conductor 3. FIG. Thereby, heat becomes easy to move toward the low temperature part on the outer surface side of the heat conductor 3 from the high temperature part on the LED module 9 side.

  Further, since the heat conductor 3 is formed of a metal having a heat conductivity of 150 W / mK or more, for example, aluminum (Al), the heat transferred from the LED module 9 to the board mounting portion 14 can be quickly radiated. 4 is transferred to the outside space. This makes it difficult for heat to accumulate in the inner space on the one end side 5a of the cylindrical body 5, and the temperature rise of the light emitting diode 8 and the substrate 2 (LED module 9) facing the one end side 5a of the cylindrical body 5 is suppressed. Thus, the light output of the light-emitting diode 8 is prevented from being lowered and the lifetime is shortened.

  Further, since the heat-absorbing paint is applied to the inner surface 3c of the heat conductor 3, the heat of the inner space is absorbed, transferred to the radiating fin body 4, and released to the outer space. Moreover, since the heat radiation paint is applied to the outer surface 3d of the heat conductor 3, the heat transferred from the LED module 9 and the heat absorbed from the internal space of the heat conductor 3 are quickly released to the external space. . As a result, the amount of heat radiated and transferred from the light emitting diode 8 to the cylindrical body 5 is further reduced.

Therefore, the temperature rise on the one end side 5a of the cylindrical body 5 is further reduced, and heat is less likely to be trapped in the inner space on the one end side 5a of the cylindrical body 5. Thereby, the temperature rise of the light emitting diode 8 and the board | substrate 2 (LED module 9) which are located near the one end side 5a of the cylindrical body 5 and which faces the one end side 5a is further reduced, and the temperature reduction of the light emitting diode 8 is reduced. It will improve. As a result, it is possible to further prevent the light output of the light emitting diode 8 from being lowered and the short life.
In the lamp device 1, the heat conductor 3 and the heat radiating fin body 4 are formed separately, but they may be integrally formed.
Next, a second embodiment of the present invention will be described.
FIG. 2 is a schematic side view of a luminaire showing a second embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.
The lighting fixture 36 shown in FIG. 2 is a projector used indoors or outdoors, and the lamp device 1 is attached to a lamp 37 as a fixture body.

  The lamp 37 is formed by, for example, aluminum die casting, and is formed in a substantially truncated cone with a bottom having an opening 38 on one end side 37a. A lamp socket 39 into which the cap 13 of the lamp device 1 is screwed is disposed inside.

  The lamp 37 is connected to a joint (joint) 40. A power cord 41 is introduced into the joint 40. The power cord 41 is introduced into the lamp 37 through a hole (not shown) and connected to the lamp socket 39.

The lamp device 1 is attached to the lamp 37 by being completely screwed to the lamp socket 39, and is supplied with power from the lamp socket 39.
Since the luminaire 36 is equipped with the lamp device 1 that prevents a decrease in light output and a short life, it is possible to obtain stable illumination light over a long period of time.

1 is a partially cutaway schematic side view of a lamp device showing a first embodiment of the present invention. The schematic side view of the lighting fixture which shows the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lamp apparatus 2 ... Board | substrate 3 ... Thermal conductor 4 ... Radiation fin body 5 as a thermal radiation means ... Cylindrical body 6 ... Cover 7 ... Lighting circuit 33, 36 ... Lighting fixture 34 ... Appliance main body 37 ... Lamp as an appliance main body

Claims (4)

A substrate provided with a light emitting element;
A heat conductor attached to the inner surface on one end side and having an outer surface spread from one end side to the other end side;
Heat dissipating means provided on the other end of the heat conductor;
One end side and the other end side are formed in a cylindrical shape, one end side is in a non-contact state with the substrate and the heat conductor, and the other end side is fixed to the other end side of the heat conductor. With the body;
A cover having a base on one end and the other end attached to one end of the heat conductor;
A lighting circuit housed in the cover for lighting the light emitting element;
A lamp device comprising:   The lamp device according to claim 1, wherein the heat conductor has a heat-absorbing coating applied on an inner surface thereof.   3. The lamp device according to claim 1, wherein the heat conductor is coated with a heat-radiating paint on an outer surface thereof. An instrument body;
A lamp socket disposed in the appliance body;
The lamp device according to any one of claims 1 to 3, wherein a base is mounted on the lamp socket;
The lighting fixture characterized by comprising.

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