JP2012119090A - Bulb type lamp and lighting fixture - Google Patents

Abstract

A light bulb lamp that has excellent heat dissipation and can be manufactured at low cost is provided.
A light-bulb lamp 1 that is detachably attached to a socket part 20 of a lighting fixture and emits illumination light when power is supplied from the socket part 20 is provided, and a light emitting element 2 that emits illumination light is provided. The light source unit 3, the pedestal unit 4 that holds the light source unit 3 in contact with the entire surface, the body unit 5 that holds the pedestal unit 4 with the light source unit 3 facing the front side, and the distal end of the body unit 5 A glove part 6 attached to the side and a base part 8 attached to the base end side of the body part 5 are provided, and the inside of the body part 5 is opposite to the surface on which the light source part 3 of the pedestal part 4 contacts. A heat radiating space S that propagates the radiant heat emitted from the heat radiating surface 4a when the side is the heat radiating surface 4a is formed, and the inner surface of the body portion 5 has radiant heat that propagates in the heat radiating space S. A heat absorption layer 15 that enhances heat absorption is provided.
[Selection] Figure 1

Description

  The present invention relates to a light bulb type lamp using a light emitting element such as an LED (Light Emitting Diode) as a light source, and a lighting fixture using such a light bulb type lamp.

  In recent years, bulb-type lamps using LEDs as light sources (so-called LED bulbs) have been developed and are beginning to spread. This LED bulb is expected to become more popular as an environmentally friendly product because it consumes less power and has a longer life than incandescent bulbs using conventional filaments.

  By the way, an LED is a heat-sensitive element, and when the temperature of the LED rises, the luminance is lowered and the lifetime is shortened. Therefore, in order to realize a long-life and highly reliable LED bulb, it is necessary to appropriately take measures for heat radiation of the LED.

  For example, in a conventional LED bulb, a substrate on which an LED is mounted is connected to a body portion (heat radiating portion) made of aluminum die cast with high thermal conductivity, and the heat generated by the LED is transferred to the body portion by heat conduction, Heat is radiated from the outer surface of the body portion to the outside by radiation (see, for example, Patent Documents 1 and 2). In addition, in an LED bulb, fins may be provided on the outer surface of the body part in order to improve heat dissipation to the outside, or the inside of the body part may be covered with a heat conductive resin in order to increase the internal heat conductivity. Has been done.

JP 2010-56059 A JP 2009-4130 A

  However, LED bulbs with such heat dissipation measures are expensive to manufacture compared to conventional incandescent bulbs that do not require heat dissipation measures. Therefore, it is desired to manufacture the LED bulb at a lower cost by increasing the heat dissipation of the LED bulb while keeping the component cost of the LED bulb low.

  The present invention has been proposed in view of such a conventional situation, and provides a light bulb type lamp that is excellent in heat dissipation and can be manufactured at low cost, and a lighting fixture including such a light bulb type lamp. For the purpose.

The gist of the present invention aimed at solving the above problems is as follows.
(1) A bulb-type lamp that is detachably attached to a socket part of a lighting fixture and emits illumination light by power supply from the socket part,
A light source unit provided with a light emitting element that emits the illumination light;
A pedestal for holding the light source in contact with one surface;
A body portion that holds the pedestal portion in a state in which the light source portion faces the front end side;
A glove part attached to the tip side of the body part;
A base part attached to the base end side of the body part,
A heat radiating space is formed inside the body part to propagate radiant heat emitted from the heat radiating surface when the side opposite to the surface of the pedestal that is in contact with the light source unit is a heat radiating surface. In addition, the bulb-type lamp is characterized in that a heat absorption layer is provided on the inner surface of the body portion to enhance heat absorption of radiant heat propagating in the heat radiation space.
(2) The total heat absorption rate in the region of a wavelength of 600 to 3000 cm ⁻¹ measured in a temperature range of 80 to 200 ° C. of the heat absorption layer is 0.65 or more, as described in (1) above Light bulb type lamp.
(3) The light bulb-type lamp according to (1) or (2), wherein the heat absorption layer is a heat absorption film that covers an inner surface of the body portion.
(4) The light-bulb lamp according to any one of (1) to (3), wherein the heat absorption layer is a black color.
(5) The light-emitting bulb according to any one of (1) to (4), wherein a heat-dissipating layer that enhances heat dissipation to the heat-dissipating space is provided on a heat-dissipating surface of the base part. Type lamp.
(6) The light bulb-type lamp according to any one of (1) to (5), wherein a heat dissipation layer that enhances heat dissipation to the outside is provided on an outer surface of the body portion.
(7) The bulb-type lamp according to any one of (1) to (6), wherein the body portion is made of a steel material.
(8) The bulb-type lamp according to any one of (1) to (7), wherein the body portion has an uneven shape.
(9) A circuit unit that controls lighting of the light source unit is provided,
The bulb-type lamp according to any one of (1) to (8), wherein the circuit part is attached to the inside of the body part via a support member.
(10) The light-emitting lamp according to any one of (1) to (9), wherein the light emitting element is an LED (Light Emitting Diode).
(11) A light fixture in which a light bulb type lamp is detachably attached to a socket part, and the light bulb type lamp emits illumination light by power supply from the socket part,
The light bulb type lamp as described in any one of said (1)-(10) is mounted | worn with the said socket part, The lighting fixture characterized by the above-mentioned.

  As described above, according to the present invention, the cost of components can be kept low while improving heat dissipation, and thus a long-life and highly reliable bulb-type lamp, and a lighting fixture including such a bulb-type lamp are provided. Can be provided at low cost.

FIG. 1 is a cutaway longitudinal sectional view showing the structure of an LED bulb to which the present invention is applied. FIG. 2 is a cross-sectional view taken along line X ₁ -X ₁ ′ of the LED bulb shown in FIG. FIG. 3 is a cross-sectional view taken along line X ₂ -X ₂ ′ of the LED bulb shown in FIG.

Hereinafter, a light bulb type lamp and a lighting fixture to which the present invention is applied will be described in detail with reference to the drawings.
A light bulb type lamp to which the present invention is applied is, for example, an LED light bulb 1 using an LED as a light source shown in FIG. 1, and this LED light bulb 1 is detachably attached to a socket portion 20 of a lighting fixture. Illumination light is emitted by supplying power from. As a lighting fixture, a lamp provided with a socket part 20 having the same standard as that of a conventional incandescent bulb can be generally used. However, a lamp provided with a socket part 20 specified independently may be used.

  As shown in FIG. 1, the LED bulb 1 includes a light source unit 3 provided with an LED (light emitting element) 2 that emits illumination light, a pedestal unit 4 that holds the light source unit 3 in contact with one surface, a light source The body part 5 that holds the pedestal part 4 with the part 3 facing the front end side, the glove part 6 attached to the front end side of the body part 5, and the lighting of the light source part 3 disposed inside the body part 5 The circuit part 7 which controls this, and the nozzle | cap | die part 8 attached to the base end side of the trunk | drum 5 are roughly provided.

  The light source unit 3 is an LED module in which a chip-like LED 2 is surface-mounted on one surface (mounting surface) of the mounting substrate 9. Among these, for the LED 2, for example, a white LED that obtains white light by using a combination of a blue LED and a yellow phosphor is used, and a plurality of such white LEDs are arranged on the mounting surface of the mounting substrate 9. On the other hand, for example, a metal substrate such as aluminum having excellent heat dissipation or a ceramic substrate is used for the mounting substrate 9, and heat generated with the operation of the LED 2 is efficiently transferred to the pedestal 4 side through the mounting substrate 9. Heat can be transferred well. Note that the configuration of the light source unit 3 is merely an example, and the type and number of LEDs 2, the arrangement, the configuration of the mounting substrate 9, and the like are not limited to this configuration, and can be implemented with appropriate changes. is there.

  The pedestal part 4 has a function as a heat radiating part that transfers heat generated in the light source part 3 to the body part 5 by heat conduction and radiates heat to the inside of the body part 5 by radiation. For this pedestal portion 4, for example, a metal plate made of aluminum, iron, copper, or an alloy thereof, or a highly thermally conductive member with excellent heat dissipation such as a ceramic substrate can be used. Moreover, the pedestal part 4 can be made of the same material as the body part 5 described later.

  The mounting substrate 9 (light source unit 3) is attached to the surface of the pedestal unit 4 on the side facing the globe unit 6 in a state of contact. On the other hand, the pedestal portion 4 emits heat transmitted from the light source portion 3 as radiant heat, with the side opposite to the surface with which the mounting substrate 9 is in contact as the heat radiating surface 4a. The pedestal portion 4 has a shape corresponding to the inner shape of the body portion 5 and has an insulating property having high thermal conductivity on the inner surface of the body portion 5 so as to close the opening on the front end side of the body portion 5. It is attached via an adhesive material 10.

  The body portion 5 has a function as a heat radiating portion that radiates heat transferred from the pedestal portion 4 by heat conduction and radiant heat emitted from the heat radiating surface 4a of the pedestal portion 4 to the outside air. The body 5 may be formed of, for example, a metal member made of aluminum, iron, copper, or an alloy thereof, or a high heat conductive member having excellent heat dissipation, such as ceramic, formed into a hollow cylindrical shape.

  In the present invention, a steel material capable of keeping the component cost low among them can be preferably used. Examples of steel materials include generally known steel plates such as cold-rolled steel plates, hot-dip galvanized steel plates, electrogalvanized steel plates, hot-dip galvanized steel plates, aluminum-plated steel plates, aluminum-zinc alloyed steel plates, and stainless steel plates. A plated steel sheet can be mentioned.

The body part 5 has a shape in which the diameter gradually increases from the proximal end side toward the distal end side. And as shown in FIG. 1, the thermal radiation space S which propagates the radiant heat discharge | released from the thermal radiation surface 4a of the said base part 4 is formed inside this trunk | drum 5. As shown in FIG. Moreover, as shown in FIG. 2, the trunk | drum 5 has the uneven | corrugated shape from which the protruding item | line part 5a and the recessed item | line part 5b which extend in an axial direction are located in a line by turns in the circumferential direction. Thereby, the surface area of the trunk | drum 5 can be expanded and the heat dissipation to the exterior can be improved. In particular, in the present invention, it is preferable that the surface area of the inner surface of the body portion 5 is 70 cm ² or more in order to improve heat dissipation.

  The globe part 6 transmits the illumination light emitted from the light source part 3, and is made of, for example, a glass or plastic translucent cover having a spherical shape. And this glove part 6 is attached so that the front end side opening part of the trunk | drum 5 may be covered.

  As shown in FIGS. 1 and 3, the circuit unit 7 includes a circuit board 7 a on which circuit components for controlling the lighting of the light source unit 3 are mounted. The circuit board 7 a is arranged inside the body unit 5. It is attached via a support member 11. The support member 11 is an insulating case provided with a recess 11 a that accommodates the circuit board 7 a, and is fixedly supported inside the body portion 5. In addition, the circuit board 7 a is electrically connected to the mounting board 9 through the lead wiring 12, and the pedestal portion 4 is formed with a hole 4 b that penetrates the lead wiring 12. Further, the circuit board 7a is electrically connected to the base portion 8 through lead wires 13a and 13b.

  The base portion 8 is a portion that is detachably attached to the socket portion 20 by screwing or the like, and is attached through the insulating member 14 so as to close the base end side opening portion of the body portion 5. Further, the base portion 8 is electrically connected to a contact provided inside the socket portion 20 at the time of mounting, and supplies power to the circuit portion 7.

  In the LED light bulb 1 to which the present invention is applied, a heat absorption layer is provided on the inner surface of the body portion 5 to enhance the heat absorption property of radiant heat propagating in the heat radiation space S. Specifically, in this LED bulb 1, a heat-absorbing coating 15 that covers the inner surface of the body portion 5 is provided as a heat-absorbing layer.

  The heat-absorbing film 15 is composed of only a resin component or various binders and a heat-absorbing pigment. As the binder, a resin is preferably used. Specifically, as the resin, for example, a polyester resin, a urethane resin, an acrylic resin, an epoxy resin, a melamine resin, a vinyl chloride resin, or the like can be used. Any type of thermosetting type may be used, and these resins may be used in combination of several kinds as required. As the binder other than the resin, generally known ones such as an inorganic material or an inorganic organic composite formed by a sol-gel method can be used. As the heat absorbing pigment, carbon black, charcoal, graphite, ferrosilicon, or the like can be used. In addition, as the heat-absorbing coating 15, a heat-absorbing coating described in WO2003 / 087432, a heat-dissipating coating described in JP 2010-062521, and the like can also be used.

  Moreover, in order to improve the heat absorptivity of the inner surface of the trunk | drum 5, it is preferable that a heat absorption layer is black. Examples of the method for blackening the inner surface of the body portion 5 include black alloy plating treatment, alkali black treatment, and anodizing treatment, which are generally known as black treatment. Further, the heat absorbing film 15 may be black. That is, the black heat-absorbing coating 15 can be obtained by using the above-described black pigment such as carbon black, charcoal, or graphite as the heat-absorbing pigment. Further, these black treatments and the heat absorbing coating 15 may be used in combination. In the present invention, “black” refers to black with respect to infrared rays, and refers not only to general black but also to all black colors including similar colors. Moreover, the heat absorption layer should just be a color with high heat absorptivity with respect to infrared rays, and can also be made into colors other than black-type color.

In this invention, the total heat absorption rate in the area | region of wavelength 600-3000 cm < ^-1 > measured in the temperature range of 80-200 degreeC of the surface (heat absorption layer) in which the process which improves the heat absorption mentioned above was performed was 0.65. The above is preferable. Thereby, in the trunk | drum 5, it can radiate | emit efficiently to external air, absorbing the radiant heat which is discharge | released from the thermal radiation surface 4a of the base part 4, and propagates the inside of the thermal radiation space S.

  Here, as a method for examining the absorption rate of thermal radiation incident on the surface of a metal plate or non-metallic material, a reflection method by an infrared spectrophotometer is well known, but when measuring by such a method, If the roughness of the surface of the metal plate or non-metallic material is rough, the incident thermal radiation is irregularly reflected, so that it is difficult to measure the absorption rate with high accuracy.

  Heat is a part of electromagnetic waves that diverge from an object, and it is known that when thermal radiation is incident on an object, part of it is reflected, part is transmitted, and the rest is absorbed. According to Kirchhoff's law, the absorptivity and emissivity of an object are the same at a constant temperature (for example, Nishikawa and Fujita, “Basic Course of Mechanical Engineering, Electrical and Thermal Engineering”, p. 289, published by Science and Engineering (1983). )). In addition, when thermal radiation is incident on a metal plate, a surface-treated metal plate, or a non-metallic material, the thermal radiation is hardly transmitted, so is the thermal radiation substantially reflected or absorbed? It becomes either.

Based on such knowledge, in the present invention, a Fourier transform infrared spectrophotometer “VALOR-III” manufactured by JASCO Corporation is used, and 80 to 200 of the surface subjected to the above-described treatment for enhancing heat absorption is used. The infrared emission spectrum in the region of wavelength 600 to 3000 cm ⁻¹ when measured in the temperature range of ° C. is measured, and this is compared with the emission spectrum of a standard black body, so that this heat absorption is increased. The heat absorption rate (thermal emissivity) on the surface was determined. As the standard black body, a steel plate sprayed with “TH1-1B black body spray” sold by Tacos Japan (Okitsumo Co., Ltd.) with a film thickness of 30 ± 2 μm was used.

  Moreover, in the LED bulb 1 to which the present invention is applied, it is also possible to provide a heat radiation layer on the heat radiation surface 4 a of the pedestal portion 4 to enhance the heat radiation property to the heat radiation space S. In this case, the same process as the process for increasing the heat absorption applied to the inner surface of the body part 5 may be performed, and the same heat absorption layer as the heat absorption layer can be used. That is, in this embodiment, the heat radiating surface 4a of the pedestal part 4 is covered with the heat absorbing film (heat radiating layer) 16 similar to the heat absorbing film (heat absorbing layer) 15, thereby the light source part 3. It is possible to efficiently dissipate the heat generated in step 3 from the heat radiation surface 4a of the pedestal portion 4 to the inside of the body portion 5 by radiation.

  Moreover, in the LED bulb 1 to which the present invention is applied, it is also possible to provide a heat dissipation layer that enhances heat dissipation to the outside on the outer surface of the body portion 5. As the heat dissipation layer, the same heat absorption layer as that described above can be used. In this embodiment, a heat absorbing film (heat dissipation layer) 17 that covers the outer surface of the body portion 5 is provided. In addition, by using the heat absorbing film 17 obtained by adding a color pigment to the heat absorbing film 15, it is possible to improve design while improving heat dissipation from the body portion 5 to the outside. is there. In addition, as a coloring pigment, generally known inorganic pigments and organic pigments such as titanium oxide, zinc oxide, and aluminum oxide can be used.

  As described above, in the LED light bulb 1 to which the present invention is applied, the heat generated in the light source unit 3 is transmitted to the body unit 5 through the pedestal unit 4 by heat conduction, and from the outer surface of the body unit 5 to the outside by radiation. In addition to radiating heat, the radiant heat (infrared rays) emitted from the radiating surface 4a of the pedestal portion 4 and propagating in the heat radiating space S is absorbed by the inner surface of the body portion 5 while being radiated from the outer surface of the body portion 5. It is possible to efficiently dissipate heat to the outside air.

  That is, in the LED bulb 1 to which the present invention is applied, the heat generated by the light source unit 3 can be efficiently radiated to the outside using both heat transfer and radiation. Moreover, in this LED light bulb 1, the steel part etc. which can hold down component cost low can be used for this trunk | drum 5 by giving the process which raises heat absorption to the inner surface of the trunk | drum 5. FIG. Furthermore, in this LED light bulb 1, the heat generated in the light source unit 3 is more efficiently transmitted to the outside by using the radiation by performing a process for improving the heat dissipation on the emission surface 4a of the pedestal unit 4 and the outer surface of the body unit 5. Heat can be dissipated.

  As described above, according to the present invention, the cost of components can be kept low while improving heat dissipation, so that the LED bulb 1 having a long life and high reliability and the lighting fixture including such an LED bulb 1 are provided. Can be provided at low cost.

In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
Specifically, the LED bulb 1 has a configuration in which the mounting substrate 9 on which the LEDs 2 are mounted is attached to the pedestal portion 4, but the present invention is not limited to such a configuration, and becomes the mounting substrate 9. The structure by which LED2 was directly mounted in the base part 4 may be sufficient. Moreover, it is also possible to form the said base part 4 and the said trunk | drum part 5 integrally as a thermal radiation part.

In the present invention, the mounting structure of the pedestal portion 4 and the body portion 5 is not limited to the structure in which the pedestal portion 4 is attached to the body portion 5 via the insulating adhesive material 10. A structure that can be attached by fitting or external fitting, or a structure that is attached by caulking or the like can be used, and the attachment structure is not particularly limited. Moreover, when the heat transfer from the base part 4 to the trunk | drum 5 is considered, it is preferable that the contact area of the base part 4 and the trunk | drum 5 is 3 cm < ² > or more.

  In addition, the shape of the body portion 5 is not particularly limited, and is not necessarily limited to the above-described uneven shape as long as a necessary surface area can be ensured. It is preferable to have. Therefore, it is not limited to the concavo-convex shape shown in FIGS. 1 to 3 described above. For example, the ridge portion and the ridge portion extending in the circumferential direction of the body portion 5 may have an concavo-convex shape alternately arranged in the axial direction, Processing for enlarging the surface area of the body part 5, such as embossing the part 5, providing fins integrally or separately on the outer surface of the body part 5, or blasting the surface of the body part 5. It is possible to apply. In addition, the shape of the globe part 6 can be changed as appropriate.

  In the present invention, in order to efficiently propagate the radiant heat emitted from the heat radiating surface 4a of the pedestal portion 4 in the heat radiating space S, for example, the heat radiating space S of the body portion 5 has a sealed structure. It is possible to use a reduced pressure space (vacuum atmosphere) or fill the heat radiation space S with an inactive infrared gas such as nitrogen.

  Further, in the present invention, in addition to the configuration using the LED 2, an EL (Electro Luminescence) element or the like can be used as a light emitting element. Further, in the LED bulb 1, the circuit unit 7 can be provided with a dimming function.

  As lighting fixtures to which the present invention is applied, as general lighting such as general (entire) lighting and partial lighting, ceiling lights, pendant lights, chandeliers, ceiling fans, down lights, bracket lights, stand lights ( Floor lamps, table lamps, etc.), foot lights, spot lights, garden lights, pouch lights, atrium lights, gate lights, etc.

  DESCRIPTION OF SYMBOLS 1 ... LED light bulb (bulb-type lamp) 2 ... LED (light emitting element) 3 ... Light source part 4 ... Base part 4a ... Radiating surface 4b ... Hole part 5 ... Body part 6 ... Globe part 7 ... Circuit part 7a ... Circuit board 8 ... Base part 9 ... Mounting board 10 ... Insulating adhesive 11 ... Support member 12, 13a, 13b ... Lead wiring 14 ... Insulating member 15 ... Heat absorbing film (heat absorbing layer) 16 ... Heat absorbing film (heat radiation layer) 17 ... heat-absorbing coating (heat dissipation layer) 20 ... socket part

Claims (11)

A bulb-type lamp that is detachably attached to a socket part of a lighting fixture and emits illumination light by supplying power from the socket part,
A light source unit provided with a light emitting element that emits the illumination light;
A pedestal for holding the light source in contact with one surface;
A body portion that holds the pedestal portion in a state in which the light source portion faces the front end side;
A glove part attached to the tip side of the body part;
A base part attached to the base end side of the body part,
A heat radiating space is formed inside the body part to propagate radiant heat emitted from the heat radiating surface when the side opposite to the surface of the pedestal that is in contact with the light source unit is a heat radiating surface. In addition, the bulb-type lamp is characterized in that a heat absorption layer is provided on the inner surface of the body portion to enhance heat absorption of radiant heat propagating in the heat radiation space. 2. The light bulb type lamp according to claim 1, wherein a total heat absorption rate in a region of a wavelength of 600 to 3000 cm ⁻¹ measured in a temperature range of 80 to 200 ° C. of the heat absorption layer is 0.65 or more.   The bulb-type lamp according to claim 1 or 2, wherein the heat absorption layer is a heat-absorbing coating that covers an inner surface of the body portion.   The bulb-type lamp according to any one of claims 1 to 3, wherein the heat absorption layer is a black color.   The light-bulb lamp according to any one of claims 1 to 4, wherein a heat radiation layer that enhances heat radiation to the heat radiation space is provided on a heat radiation surface of the pedestal portion.   The light bulb type lamp according to any one of claims 1 to 5, wherein a heat radiating layer is provided on an outer surface of the body portion to enhance heat radiating performance to the outside.   The bulb body lamp according to any one of claims 1 to 6, wherein the body portion is made of a steel material.   The light bulb type lamp according to any one of claims 1 to 7, wherein the body portion has an uneven shape. A circuit unit for controlling lighting of the light source unit;
The bulb-type lamp according to any one of claims 1 to 8, wherein the circuit part is attached to the inside of the body part via a support member.   The light-emitting lamp according to claim 1, wherein the light emitting element is an LED (Light Emitting Diode). A light bulb type lamp is detachably attached to a socket part, and the light bulb type lamp emits illumination light by power supply from the socket part,
The light bulb type lamp as described in any one of Claims 1-10 is mounted | worn with the said socket part, The lighting fixture characterized by the above-mentioned.

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