JP2013089314A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture having heat radiation property improved as compared with one having no thermal connection body.SOLUTION: In the lighting fixture to which a bulb-shaped LED lamp 3 including a heat radiation part 33 interposed between a base 31 and a light emission part 32 is connected, there are provided a socket 1 to which the base 31 is connected and a fixture body 2 having a cylindrical connection part 21 surrounding the socket 1. Further, there is provided a thermal connection body 5 which is connected elastically to the heat radiation part 33 and to an inner circumferential face of the connection part 21 as well, and thermally connects the fixture body 2 and the LED lamp 3. Since heat radiation is carried out from the LED lamp 3 to the fixture body 2 through the thermal connection body 5, heat radiation property is improved as compared with a case where the thermal connection body 5 is not provided.

Description

  The present invention relates to a lighting fixture.

  Conventionally, a bulb-type LED lamp has been provided (see, for example, Patent Document 1). This type of LED lamp has a base similar to an incandescent bulb at one end and a light emitting portion at the other end. The light emitting unit is, for example, one in which a plurality of light emitting diodes are covered with a dome-shaped cover that diffuses the light of these light emitting diodes. A lighting circuit that turns on the light-emitting diode with DC power obtained by converting AC power supplied from the base is housed in the heat radiating part interposed between the light emitting part and the base. Since the heat dissipation part can be made of a metal having a higher thermal conductivity than the light emitting part, heat dissipation of the LED lamp is performed mainly by the heat dissipation part, and a heat dissipation fin is provided on the outer peripheral surface of the heat dissipation part. Sometimes.

  The above LED lamps can be used by connecting to a well-known lighting fixture for incandescent bulbs.

JP 2011-14306 A

  Conventionally, heat dissipation of the LED lamp has been performed mainly by air cooling. That is, in the luminaire using the LED lamp, the LED lamp is supported only on the base, and no other components are in contact with the heat radiation portion of the LED lamp. For this reason, the heat dissipation was relatively low.

  In particular, when a lighting fixture is embedded in an embedding hole provided on the construction surface, air is less likely to flow around the lighting fixture than when the entire lighting fixture is protruded from the construction surface. Therefore, the temperature of the LED lamp tends to rise.

  This invention is made | formed in view of the said reason, The objective is to provide the lighting fixture with improved heat dissipation.

  The lighting fixture of the present invention is a lighting fixture to which a bulb-type LED lamp having a base, a light emitting portion that emits light by power feeding through the base, and a heat dissipation portion interposed between the base and the light emitting portion is connected. A socket to which the base is connected; an instrument main body having at least a cylindrical connecting part surrounding the socket; and an instrument main body elastically contacting the heat radiating part and elastically contacting the inner peripheral surface of the connecting part; And a thermal connector that thermally connects the LED lamp.

  In the above luminaire, it is desirable that the thermal connection body has a cylindrical shape and closes a gap between the LED lamp and the connecting portion over the entire circumference.

  Moreover, in the above-described lighting fixture, it is preferable that the fixture main body constitutes a storage recess in which the light emitting portion is exposed to the inside, and the inner surface of the storage recess reflects the light of the LED lamp.

  Furthermore, in the above-described lighting apparatus, the apparatus main body is embedded in an embedded hole provided in a construction surface, and has a ring shape surrounding the apparatus main body. It is desirable to provide a construction surface side packing that closes the gap between the main body.

  Further, in the above luminaire, a cover made of a light-transmitting material and coupled to the instrument main body to cover the light emitting portion, and a cover side packing that closes a gap between the cover and the instrument main body. It is desirable to provide.

  According to the present invention, the heat dissipation of the LED lamp is improved as compared with the case where no thermal connection body is provided.

It is sectional drawing which shows embodiment of this invention. It is a perspective view which shows the state which the socket couple | bonded with the connection part same as the above. It is a perspective view which shows the same as the above. It is sectional drawing which shows the example of a change same as the above. It is the partially broken front view which shows another example of a change same as the above. It is the partially broken front view which shows another example of a change same as the above. It is the partially broken front view which shows another example of a change same as the above. It is the partially broken front view which shows another example of a change same as the above. It is the partially broken front view which shows another example of a change same as the above. It is the partially broken front view which shows another example of a change same as the above. It is the partially broken front view which shows another example of a change same as the above. It is the partially broken front view which shows another example of a change same as the above.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the present embodiment is a lighting fixture to which a bulb-type LED lamp 3 is connected and embedded in an embedded hole 40 provided in a ceiling surface 4 as a construction surface. Hereinafter, the vertical direction will be described with reference to FIG.

  More specifically, the LED lamp 3 includes a base 31 formed in the same size and shape as a base of a general incandescent bulb, a light emitting part 32 that emits light by power feeding through the base 31, a base 31, and a light emitting part 32. And a heat radiating portion 33 interposed between the two. In the light emitting unit 32, for example, a plurality of light emitting diodes are covered with a dome-shaped cover that diffuses light of these light emitting diodes. In addition, a lighting circuit (not shown) that turns on the light-emitting diode with DC power obtained by converting AC power supplied from the base 31 is housed in the heat radiating unit 33.

  In addition, the present embodiment includes a socket 1 to which a base 31 of the LED lamp 3 is connected, and an instrument body 2 that holds the socket 1. The instrument body 2 has a storage recess 20, the socket 1 is held in a form exposed on the bottom surface of the storage recess 20, and the LED lamp 3 is connected with the light emitting unit 32 facing downward.

  The socket 1 has a wire connection part 11 to which the other end of a power supply line (not shown) whose one end is connected to a power supply is connected, and a base connection part 12 to which a base 31 is connected. The wire and the base 31 are electrically connected to each other. The socket 1 is formed by holding a conductive portion made of a conductive material on a structure made of an insulating material such as PPS resin. The wire connection portion 11 may be a connector-like structure in which a plug provided at the other end of the power supply line is inserted and connected, or a known terminal structure such as a quick connection terminal to which the power supply line itself is connected. There may be. In any case, since the socket 1 can be realized by a well-known technique, detailed illustration and description are omitted.

  The appliance body 2 has a cylindrical shape surrounding the socket 1 and is connected to the connecting portion 21 to which the socket 1 is coupled, and is connected to the lower side of the connecting portion 21 and has an inner diameter larger than that of the connecting portion 21, and the LED lamp 3 on the inner peripheral surface. And a shade portion 22 that reflects the light. The wire connecting portion 11 of the socket 1 protrudes above the connecting portion 21, and the base connecting portion 12 is exposed below the connecting portion 21. Moreover, in this embodiment, the connection part 21 is comprised with components different from the cap part 22. As shown in FIG. Synthetic resin or metal can be used as the material of the connecting portion 21 and the shade portion 22, and in particular, the material of the connecting portion 21 that functions as a heat sink preferably has a high thermal conductivity. As means for coupling the connecting portion 21 to the shade portion 22, well-known means such as screwing or uneven engagement can be used as appropriate. Further, in the shade portion 22, the surface constituting the inner surface of the housing recess 20 (that is, the surface directed toward the LED lamp 3) reflects the light of the LED lamp 3. The reflection as described above can be realized by subjecting the cap portion 22 to appropriate processing such as polishing and plating.

  Furthermore, as shown in FIG. 2, a plurality of heat radiation fins 211 each having a thickness direction in the circumferential direction of the coupling portion 21 are arranged on the outer circumferential surface of the coupling portion 21 so as to protrude in the circumferential direction. Yes. The heat dissipation is improved by increasing the surface area compared to the case where the radiation fins 211 are not provided.

  The instrument body 2 has a ring shape projecting outward in the radial direction (that is, the direction along the ceiling surface 4) from the lower end of the cap portion 22, and is embedded in the outer peripheral surface of the cap portion 22 when viewed from below. It has the collar part 23 which covers the clearance gap between the inner peripheral surfaces of the insertion hole 40.

  Further, the instrument body 2 includes a plurality of mounting springs 24 which are made of a leaf spring having one end connected to the cap portion 22 on the upper side of the flange portion 23 and can be elastically deformed in a direction in which the distance from the flange portion 23 is changed. Have. For example, as shown in FIG. 3, three attachment springs 24 are provided at substantially equal intervals in the circumferential direction of the cap portion 22. That is, the ceiling material which comprises the ceiling surface 4 is pinched | interposed between the attachment spring 24 and the collar part 23, and this embodiment is fixed with respect to the ceiling surface 4. FIG.

  Here, this embodiment is provided with the thermal connection body 5 that is in a cylindrical shape surrounding the heat radiating portion 33 of the LED lamp 3 and elastically contacts the inner peripheral surface of the connecting portion 21 of the fixture body 2 over the entire circumference. That is, the heat radiating part 33 of the LED lamp 3 and the appliance main body 2 are thermally connected to each other via the thermal connection body 5. Further, in order to ensure the efficiency of heat transfer between the LED lamp 3 or the instrument body 2 and the thermal connection body 5, the thermal connection body 5 is a connecting portion between the heat radiation part 33 of the LED lamp 3 and the instrument body 2. It is desirable to close the gap between 21 and the entire circumference. Furthermore, the thermal connection body 5 of the present embodiment is also interposed between the socket 1 and the inner peripheral surface of the connecting portion 21.

  As the material of the thermal connection body 5, a flexible material having as high a thermal conductivity as possible is desirable. For example, a material used as a material for a heat conductive sheet or a heat conductive compound can be used. More specifically, for example, a material obtained by mixing metal oxide particles into an acrylic or silicon synthetic resin can be used as the material of the thermal connection body 5.

  According to the said structure, the heat dissipation of the LED lamp 3 is improved compared with the case where the thermal connection body 5 is not provided, or the thermal connection body 5 is not elastically contacted with the entire inner peripheral surface of the connecting portion 21. In particular, when the instrument main body 2 is embedded in the embedding hole 40 as in the example of FIG. 1, compared to the case where the entire instrument main body 2 is protruded from the ceiling surface 4, the instrument main body 2 is surrounded by Since it becomes difficult for air to flow and the efficiency of air cooling decreases, the heat dissipation of the LED lamp 3 is important. Moreover, compared with the case where it is going to ensure the efficiency of air cooling by enlarging the distance of the thermal radiation part 33 of the LED lamp 3, and the instrument main body 2, size reduction as a whole is attained.

  Furthermore, a heat radiating paint (for example, an aluminum paint or a ceramic paint) may be applied to the appliance main body 2 or the socket 1 in order to improve heat dissipation. Moreover, when the instrument body 2 is made of aluminum, the instrument body 2 may be anodized.

  1 and 3, the central axis of the LED lamp 3 is inclined with respect to the normal line of the opening surface of the housing recess 20 (the normal line of the ceiling surface 4). However, as shown in FIG. 3 may be parallel to the normal line of the opening surface of the storage recess 20. Compared with the example of FIG. 1, the example of FIG. 4 can make the shape of the shade portion 22 for ensuring the uniformity of light distribution relatively simple, instead of having a larger vertical dimension. There are advantages. In the present embodiment, the connecting portion 21 of the instrument main body 2 is formed of a separate part from the cap portion 22 and the flange portion 23, so that in the example of FIG. 1 and the example of FIG. The parts of the connecting portion 21 can also be shared.

  Further, instead of being embedded in the embedding hole 40 as described above, a structure may be adopted in which it is exposed and fixed to the lower side of the ceiling surface 4 as shown in FIG. As means for fixing the instrument body 2 to the ceiling surface 4, for example, known means such as screwing can be used.

  Or as shown in FIG. 6, it is good also as a structure where the instrument main body 2 is connected via the arm 43 with respect to the fixing member 42 fixed with respect to the ceiling surface 4. As shown in FIG. The fixing member 42 is, for example, a wiring duct. The instrument body 2 is pivotally attached to the arm 43 so as to be rotatable up and down, for example.

  Or it is good also as a structure suspended and supported from the ceiling surface 4 as shown in FIG. As the support means 44 for connecting the ceiling surface 4 and the instrument body 2 to each other, a power line may be used, or a separate string or wire may be used for the power line.

  Moreover, as shown in FIG. 8, you may comprise the connection part 21, the cap part 22, and the collar part 23 with one part by mutually continuing. If this configuration is adopted, the manufacturing cost can be reduced by reducing the number of parts.

  Further, in the example of FIG. 8, an annular construction surface side packing 61 that surrounds the cap portion 22 is disposed on the upper side of the flange portion 23. The work surface side packing 61 is made of a flexible material such as elastomer or synthetic rubber. That is, the clearance between the flange 23 and the ceiling surface 4 is blocked by the construction surface side packing 61, thereby preventing water from entering and leaving through the embedded hole 40.

  Moreover, as shown in FIGS. 9 to 11, a cover 7 made of a light-transmitting material and coupled to the instrument body 2 to cover the light emitting unit 32 may be provided. For example, acrylic resin, polycarbonate resin, or glass can be used as the material of the cover 7. The cover 7 has, for example, a bottomed cylindrical shape, and is coupled to the instrument body 2 by screwing a screw thread provided on the outer peripheral surface of the cover 7 into a screw groove provided on the inner peripheral surface of the cap portion 22. The cover 7 may simply be provided for the purpose of protecting or waterproofing the LED lamp 3, or may have a lens-like structure and contribute to light distribution, or may be a well-known dye. Or a phosphor may be used to convert the light color of the LED lamp 3.

  In the example of FIGS. 9 to 11, the cover 7 is flexible between the distal end surface (the upper end surface in FIGS. 9 and 10, the right end surface in FIG. 11) and the instrument body 2 that is directed to the back side of the storage recess 20. A cover side packing 62 made of a different material is interposed. As a material of the cover side packing 62, for example, synthetic rubber or elastomer can be used. The cover-side packing 62 has a ring shape along the edge of the cover 7 and closes the gap between the cover 7 and the instrument body 2 over the entire circumference. That is, the cover side packing 62 prevents water from entering the contact portion between the base 31 and the socket 1.

  By the way, when the LED lamp 3 is rotated with respect to the fixture body 2 when connected to the socket 1, stress is applied to the thermal connection body 5 sandwiched between the fixture body 2 and the LED lamp 3, so that the thermal connection is achieved. It is conceivable that the body 5 is damaged. In particular, when the LED lamp 3 is provided with irregularities such as heat radiating fins (not shown) on the outer peripheral surface of the heat radiating portion 33, the above-described damage is likely to occur. Then, as shown in FIG. 12, you may comprise the thermal connection body 5 by the some components 51 and 52 which are piled up in radial direction and can slide mutually. 12 has a cylindrical shape and an inner cylinder 51 elastically contacting the outer peripheral surface of the heat radiating portion 33 of the LED lamp 3, and a cylindrical shape and the inner peripheral surface slides on the outer peripheral surface of the inner cylinder 51. The outer cylinder 52 is movable and has an outer peripheral surface that elastically contacts the inner peripheral surface of the storage recess 20. If this configuration is adopted, the stress is absorbed by the rotation of the inner cylinder 51 with respect to the outer cylinder 52, and therefore, damage is less likely to occur compared to the case where the thermal connector 5 is composed of a single component. Furthermore, in the example of FIG. 12, a second thermal connection body 8 made of the same material as the thermal connection body 5 and interposed between the socket 1 and the instrument main body 2 is provided separately from the thermal connection body 5. .

1 Socket 2 Appliance body 3 LED lamp 4 Ceiling surface (construction surface)
DESCRIPTION OF SYMBOLS 5 Thermal connection body 20 Storage recessed part 21 Connection part 31 Base 32 Light emission part 33 Heat radiation part 40 Embedded hole 61 Construction surface side packing 62 Cover side packing

Claims (5)

A lighting fixture to which a bulb-type LED lamp having a base and a light emitting portion that emits light by power feeding through the base and a heat dissipation portion interposed between the base and the light emitting portion is connected,
A socket to which the base is connected;
An instrument body having at least a cylindrical connecting portion surrounding the socket;
A lighting fixture comprising: a thermal connector that elastically contacts the heat radiating portion and elastically connects the fixture body and the LED lamp by elastically contacting the inner peripheral surface of the connecting portion.   The lighting apparatus according to claim 1, wherein the thermal connection body has a cylindrical shape and closes a gap between the LED lamp and the connecting portion over the entire circumference. The instrument body constitutes a storage recess where the light emitting part is exposed to the inside,
The lighting apparatus according to claim 1, wherein an inner surface of the housing recess reflects light from the LED lamp.   The instrument body is embedded in an embedding hole provided in a construction surface, and has a ring shape surrounding the instrument body, and closes a gap between the embedding hole and the instrument body. The lighting fixture according to any one of claims 1 to 3, further comprising a construction surface side packing to be performed.   A cover made of a light-transmitting material and coupled to the instrument main body to cover the light emitting portion, and a cover side packing for closing a gap between the cover and the instrument main body. The lighting fixture of any one of 1-4.

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