JP6026297B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting fixture such as a ceiling-embedded downlight.

  In recent years, lighting fixtures using LEDs (light emitting diodes) with high brightness and long life as a light source have become widespread.

  However, the biggest problem with LEDs is that most of the input power becomes heat and the light emission efficiency and durability life are reduced by the heat generated by itself. For this reason, a cooling structure in which a heat sink is provided in the luminaire and heat generation of the LED is suppressed by heat dissipation from the heat sink has been put into practical use (see, for example, Patent Document 1).

  Here, the conventional lighting fixture provided with the heat sink is shown in FIG.

  That is, FIG. 6 is a cross-sectional view showing an installation state of a conventional lighting fixture. The illustrated lighting fixture 101 is a ceiling-embedded downlight, and a heat sink 103 is attached to the fixture body 102. A substrate 105 on which the LEDs 104 are mounted is attached to the lower surface of the heat sink 103 via a heat dissipation sheet 106. A plate spring-like mounting spring 107 is provided on both sides of the instrument body 102.

  Thus, after the downlight 101 is passed from below through the hole 110a that opens to the ceiling wall 110 with the attachment springs 107 on both sides being compressed, the attachment spring 107 spreads by its own elasticity and the peripheral edge of the hole 1110a. It is fixed as shown in FIG.

  In such a downlight 101, when the LED 104 is activated and emits light, the light passes through the hole 110a of the ceiling wall 110 and is irradiated downward to be used for downward illumination. At the same time, the LED 104 generates heat by light emission, but the heat is conducted from the substrate 105 to the heat sink 103 through the heat radiating sheet 106 and is radiated from the heat sink 103 into the ceiling, and this heat dissipation increases the temperature of the LED 104. It can be suppressed.

JP 2012-204199 A

  By the way, with the recent increase in output of lighting fixtures, high heat dissipation performance is required for the heat sink. However, since the heat sink is made of aluminum die casting or the like, in the downlight 101 shown in FIG. Is limited to a size that can pass through the hole 110 a of the ceiling wall 110.

  In order to improve the heat dissipation performance of the heat sink, it is necessary to increase its surface area (heat transfer area) and to provide some space between the heat dissipating fins, but there is a limit to the downlight 101 as shown in FIG. Further, even if the height of the heat sink 103 is increased, the distance from the LED 104 that is a heat source is increased, so that the heat radiation performance is hardly improved.

  The present invention has been made in view of the above problems, and the object of the present invention is to provide a lighting apparatus capable of enhancing the heat dissipation performance of the heat sink without being limited by the size of the hole of the attached member. It is in.

  In order to achieve the above object, the invention according to claim 1 is configured by attaching a heat sink having a light source and a heat radiating fin back to back on an instrument body, inserted through a hole opened in a member to be attached, and provided in the instrument body. In the lighting fixture fixed to the periphery of the hole of the mounted member by the mounting spring, the heat dissipating fin is configured to be expandable by a flexible sheet, and the hole of the mounted member is compressed and contracted. The heat dissipating fins are expanded after passing through.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the heat dissipating fins are expanded by the urging force of the mounting spring.

  A third aspect of the invention is characterized in that, in the first aspect of the invention, the heat dissipating fins are expanded by a biasing force of a dedicated spring.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the heat dissipating fins are expanded in multiple directions.

  According to the present invention, the surface of the radiation fin is expanded because the radiation fin is passed through the hole of the mounted member such as the ceiling wall in a state where the radiation fin is compressed and then the radiation fin is expanded. And widen the spacing. As a result, the heat dissipation performance of the heat sink can be enhanced without being limited by the size of the hole of the attached member through which the lighting fixture passes, and the temperature rise is suppressed by efficiently cooling the light source such as the LED. Can do. If the heat dissipating fins are expanded in multiple directions, the surface area can be further increased.

It is sectional drawing of the lighting fixture which concerns on Embodiment 1 of this invention, Comprising: (a) shows the state before installation, (b) shows the state after installation, respectively. It is a top view which shows the state of the heat sink of the lighting fixture which concerns on Embodiment 1 of this invention, Comprising: (a) shows a contracted state, (b) shows an expanded state, respectively. It is a figure which shows the example which matched the shape of the heat sink with the shape of the hole in the lighting fixture which concerns on Embodiment 1 of this invention, Comprising: (a) shows a contracted state, (b) shows an expanded state, respectively. It is sectional drawing which shows the installation state of the lighting fixture which concerns on Embodiment 2 of this invention. It is a figure which shows the state of the heat sink in the lighting fixture which concerns on Embodiment 3 of this invention, Comprising: (a) is a top view which shows a contracted state, (b) is a top view which shows an expanded state, (c) is an enlarged view. It is a sectional side view which shows an open state. It is sectional drawing which shows the installation state of the conventional lighting fixture.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1>
FIG. 1 is a cross-sectional view of a lighting fixture according to Embodiment 1 of the present invention, where (a) is a state before installation, (b) is a diagram showing a state after installation, and FIG. 2 is a heat sink of the lighting fixture. It is a top view which shows this state, (a) is a contracted state, (b) is a figure which shows an expanded state.

  The lighting fixture 1 according to the present embodiment is a ceiling-embedded downlight. In this downlight 1, an LED 4 as a light source is provided on the lower surface of a base 3a of a heat sink 3 installed in the fixture body 2. The mounted substrate 5 is attached via a heat dissipation sheet 6. That is, the LED 4 and the substrate 5 are attached to the instrument body 2 back to back with the heat sink 3. A plate spring-like mounting spring 7 is provided on both sides of the instrument body 2.

  By the way, in this Embodiment, the radiation fin 3b of the heat sink 3 is comprised by the flexible paper-made heat radiation sheet | seat with high heat conductivity, and the radiation fin 3b erected on the base 3a is bellows-like. It is folded back into a fan shape. And both ends of this radiation fin 3b are each attached to each attachment spring 7 of both sides.

  Thus, when the downlight 1 is installed, as shown in FIG. 1A, the mounting spring 7 and the heat dissipating fins 3b of the heat sink 3 are larger than the inner diameter of the circular hole 10a of the ceiling wall 10 which is a mounted member. The downlight 1 is passed through the hole 10a of the ceiling wall 10 from below in a state where it is pressed and contracted to a small extent. The state of the radiation fins 3b of the heat sink 3 at this time is shown in FIG. 2A, but the interval between the radiation fins 3b in the contracted state is narrow.

  When the downlight 1 passes through the hole 10a of the ceiling wall 10, as shown in FIG. 1 (b), the leaf springs 7 on both sides open by their own elasticity and are locked to the periphery of the hole 10a. Is fixed in a state of being stored in the back side of the ceiling wall 10. At the same time, the heat dissipating fins 3b of the heat sink 3 are expanded in a fan shape by the urging force of the mounting spring 7, so that the surface area (heat transfer area) is increased and the heat dissipating fins 3b as shown in FIG. The interval of can be expanded. As a result, the heat dissipation performance of the heat sink 3 is enhanced without being limited by the size of the hole 10a of the ceiling wall 10, and the LED 4 is efficiently cooled and the temperature rise is suppressed.

  By the way, as shown in FIG. 3A, if the shape of the radiating fin 3b of the heat sink 3 is matched with the circular shape of the hole 10a of the ceiling wall 10 when the radiating fin 3b is in a contracted state, this is illustrated. As shown in 3 (b), the surface area when expanded can be further increased, and the heat dissipation performance of the heat sink 3 can be further enhanced.

<Embodiment 2>
Next, an embodiment of the present invention will be described below with reference to FIG.

  FIG. 4 is a cross-sectional view showing the installation state of the lighting fixture according to Embodiment 2 of the present invention. In this figure, the same elements as those shown in FIG. The re-explanation about is omitted.

  In the first embodiment, both ends of the radiating fins 3b of the heat sink 3 are attached to the mounting springs 7 on both sides, and the radiating fins 3b are expanded by the urging force of the mounting springs 7, but in this embodiment, A dedicated spring 8 is provided, and the heat dissipating fin 3b is expanded by the spring 8, and the other configuration is the same as that of the first embodiment. Therefore, also in the present embodiment, the same effect as in the first embodiment can be obtained.

<Embodiment 3>
Next, a third embodiment of the present invention will be described with reference to FIG.

  5A and 5B are diagrams showing a state of a heat sink in the lighting fixture according to Embodiment 3 of the present invention, in which FIG. 5A is a plan view showing a contracted state, FIG. 5B is a plan view showing an expanded state, and FIG. ) Is a side sectional view showing an expanded state.

  In the present embodiment, when the radiating fins 3b of the heat sink 3 are in a contracted state, the radiating fins 3b are folded into a star shape (starfish shape) as shown in FIG. When passing through the hole 10a of the wall 10, as shown in FIGS. 5B and 5C, the radiating fins 3b are spread in two directions orthogonal to each other by the four mounting springs 7, and the radiating fins 3b are formed in a bag as shown in the figure. It expands in a shape.

  Thus, if the heat dissipating fins 3b of the heat sink 3 are expanded in two directions as in the present embodiment, the surface area can be further increased, and the heat dissipating performance of the heat sink 3 can be effectively increased. Can be increased.

  In the present embodiment, the heat dissipating fins 3b of the heat sink 3 are expanded in two directions, but may be expanded in three or more directions.

  By the way, although the above demonstrated the form which applied this invention with respect to the downlight, of course, this invention is applicable similarly to other arbitrary lighting fixtures embed | buried in a wall or a floor. It is.

  In the above embodiment, the heat dissipating fin is constituted by a paper heat dissipating sheet having a high thermal conductivity. This includes silicon nitride, aluminum nitride, magnesia, alumina silicate, silicon, iron, silicon carbide, carbon, Paper made by bonding heat conductive powder such as boron nitride, alumina, silica, aluminum, copper, silver, gold, etc. to a fiber and made on a sheet, or sandwiched between both surfaces of graphite paper with aluminum or its alloy There is.

  Furthermore, in the above embodiment, the flexible sheet constituting the radiation fin has been described with a paper radiation sheet, but instead of this, a resin radiation sheet formed by adding thermally conductive powder, thin aluminum or copper, A metallic heat-dissipating sheet or the like having a laminated structure of graphite may be used, and any material that is flexible and has high heat-dissipation characteristics such as thermal conductivity and thermal emissivity can be used.

1 Downlight (lighting fixture)
2 Apparatus body 3 Heat sink 3a Heat sink base 3b Heat sink fin 4 LED (light source)
5 Substrate 6 Heat dissipation sheet 7 Mounting spring 8 Spring 10 Ceiling wall (attached member)
10a Hole in the ceiling wall

Claims (4)

A heat sink having a light source and a radiation fin is attached back to back on the instrument body, inserted through a hole opening in the attached member, and fixed to the periphery of the hole of the attached member by an attachment spring provided in the instrument body. In lighting fixtures,
The heat dissipating fin is configured to be expandable by a flexible heat dissipating sheet, and the heat dissipating fin is expanded after passing through the hole of the attached member in a state where the heat dissipating fin is compressed. Lighting equipment characterized by   The lighting apparatus according to claim 1, wherein the heat dissipating fins are expanded by an urging force of the mounting spring.   2. The luminaire according to claim 1, wherein the heat dissipating fins are expanded by a biasing force of a dedicated spring. The lighting apparatus according to claim 1, wherein the heat dissipating fins are expanded in multiple directions.

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