JP2012227050A - Illumination apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination apparatus, in which an illumination direction of light of a lighting body can be changed, and heat can be conducted from a high temperature part of the lighting body to a heat dissipating member.SOLUTION: The illumination apparatus 1 includes: the lighting body 2 having a cylindrical outer frame 22 accommodating an LED package 21; an attachment member 5 provided with a tubular rotation drum 51 extended vertical with respect to a ceiling surface 6; the heat dissipating member 3 having fins formed by good heat conductors, and rotatably attached to the rotation drum 51; and an arm 7 attached to the heat dissipating member 3. A cooling part 42 at one end of a heat transmitting body 4 composed of a heat pipe is inserted to the heat dissipating member 3, and the heat transmitting body 4 integrally rotates with the heat dissipating member 3. A heat receiving part 41 at the other end of the heat transmitting body 4 is extended in the horizontal direction of the ceiling surface 6, and the heat receiving part 41 is attached with the lighting body 2 capable of rotating by a bearing part provided in the outer frame 22.

Description

  The present invention relates to a luminaire that can change the irradiation direction of light from a lamp body in which a light source is housed in an outer shell.

Conventionally, it has been provided with a support member that supports the lamp body in which the light source is housed in the outer wall with respect to a predetermined position such as a ceiling or floor, and supports the lamp body so that the direction of the lamp body can be changed with respect to the predetermined position. Thus, there is provided a lighting fixture that can change the irradiation direction of the light from the lamp body. In recent years, light emitting diodes have attracted attention as light sources. However, since light emitting diodes generate a large amount of heat with respect to input power, it is necessary to provide a heat dissipation member. Therefore, in many cases, a heat radiating member including a heat radiating fin is directly attached to the lamp body. Moreover, also about the lighting fixture provided with the electronic ballast in the lamp body, in order to radiate heat from an electronic ballast, a heat radiating member may be attached to a lamp body.
In this type of luminaire, since it is necessary to move the lamp and the heat radiating member together in order to change the irradiation direction of the light from the lamp, a large force acts on the movable mechanism of the support member. Therefore, there arises a problem that the movable mechanism of the support member becomes large or a complicated movable mechanism is required. In addition, since the heat radiating member is attached to the lamp body, design restrictions are imposed on the external shape of the lamp body.

  Therefore, in order to separately arrange the lamp body and the heat radiating member, a technique has been proposed in which a heat transfer body that efficiently performs heat transfer is provided between the lamp body and the heat radiating member. Since the heat transfer body needs to increase the heat transfer efficiency, a heat pipe is used. In this configuration, since the lamp body and the heat radiating member are separated from each other, the support member may be provided with a movable mechanism for the lamp body and a movable mechanism for the heat radiating member separately. Therefore, when only the lamp is moved to change the light irradiation direction, the force acting on the support member is reduced, and the movable mechanism of the support member can be made small and simple.

  As a lighting fixture in which the lamp body and the heat radiating member are separated as described above, Patent Document 1 proposes a configuration shown in FIG. In this configuration, a lamp body 20 including a light emitting diode 203 mounted on a base 202 as a light source and a heat dissipation unit 30 as a heat dissipation member are connected via a heat transfer unit 40 as a heat transfer body. A spherical end portion 401 is formed at one end portion of the heat transfer unit 40, and the spherical end portion 401 is rotatably held by a spherical receiving portion 201 provided in the lamp body 20. The spherical surface receiving portion 201 is provided on the back side of the base 202 to which heat from the light emitting diode 203 is transmitted in the lamp body 20. In this configuration, the heat generated in the lamp body 20 is transmitted from the spherical receiving portion 201 to the heat transfer unit 40 through the spherical end portion 401 and further transferred to the heat dissipation unit 30 through the heat transfer unit 40. In this configuration, the heat transfer unit 40 is also used as a support member.

  Further, in Patent Document 1, as another configuration, as shown in FIG. 5, a light source mounting part 200 as a lamp body to which a light source is attached and a heat radiating unit 300 as a heat radiating member include two heat dissipations as heat transfer bodies. A configuration connected via the rings 402 and 403 is described. The light source attachment portion 20 is attached to both the heat dissipation rings 402 and 403. Further, the inner peripheral surface of the heat dissipating unit 300 forms a part of a spherical surface, and part of the heat dissipating rings 402 and 403 is in contact with the inner peripheral surface. Therefore, the light source mounting part 200 and the heat dissipation rings 402 and 403 can swing along the inner peripheral surface of the heat dissipation unit 300. In this configuration, heat is transmitted from the light source mounting portion 200 to the heat dissipation member 300 via the heat dissipation rings 402 and 403.

  On the other hand, as shown in FIG. 6, Patent Document 2 describes a configuration in which a lamp body 90 and a heat sink 91 as a heat radiating member are connected by a heat pipe 92 as a heat transfer body. The heat pipe 92 includes two bent portions 95 and 96. The lamp body 90 includes a light source 93 made of a light emitting diode, and the light source 93 is attached to a heat conductive member 94 made of aluminum. One end of the heat pipe 92 is connected to the heat conductive member 94, and heat from the light source 93 is transmitted through the heat conductive member 94. One bent portion 95 is bent in a substantially semicircular shape in the AA direction in FIG. 6, and the other bent portion 96 is bent in a substantially semicircular shape in the BB direction in FIG. 6. The AA direction and the BB direction are orthogonal to each other. In this configuration, the light irradiation direction of the lamp body 90 can be changed by bending the bent portion 95 and the bent portion 96.

Japanese Patent No. 4103437 JP 2008-218386 A

  In the configuration shown in FIG. 4, heat transfer is performed from the lamp body 20 to the heat transfer unit 40 only at the contact portion between the spherical receiving portion 201 and the spherical end portion 401. The area of the part involved in heat transfer between the lamp body 20 and the heat transfer unit 40 is small, and heat is not sufficiently transferred from the lamp body 20 to the heat transfer unit 40.

  Further, in the configuration shown in FIG. 5, heat transfer is performed only at the contact portion between the heat dissipation rings 402 and 403 and the heat dissipation unit 300, and therefore the portion involved in heat transfer between the heat dissipation rings 402 and 403 and the heat dissipation unit 300. Is small, and heat is not sufficiently transferred from the heat dissipation rings 402 and 403 to the heat dissipation unit 300. Further, since the heat radiating unit 300 is mounted so as to surround the light source mounting part 200, the heat radiating unit 300 has to have an outer shape larger than that of the light source mounting part 200. Since the heat dissipating member 300 and the light source mounting portion 200 are integrated, there is a design restriction on the external shape.

  In the configuration shown in FIG. 6, it is necessary to bend the heat pipe 92 every time the light irradiation direction is changed. Therefore, the heat pipe 92 may be flattened by an external force when the heat pipe 92 is bent, The pipe 92 may be cracked. That is, there is a problem that it is not suitable for applications in which the irradiation direction is repeatedly changed.

  The present invention has been made in view of the above reasons, and in a lighting fixture in which the irradiation direction of light from the lamp body can be changed, the lamp body and the heat radiating member are separated, and the heat radiating member is separated from the lamp body. An object of the present invention is to provide a lighting fixture that has a high efficiency of heat transfer to the light source and that can repeatedly change the direction of light irradiation.

  The luminaire of the present invention includes a lamp body including a light source and an outer shell for housing the light source, a heat radiating member formed of a heat good conductor and having fins, and a heat transfer body including a heat pipe that conducts heat from the lamp body to the heat radiating member. A heat radiating member is attached to the cooling portion at one end of the heat transfer body, the heat transfer body and the heat radiating member rotate integrally, and the heat receiving portion at the other end of the heat transfer body is The outer shape of the lamp is circular, and a portion of the lamp body that becomes hot as the light source emits light is provided with a bearing portion into which the heat receiving portion is fitted, and the bearing portion is formed to match the size of the heat receiving portion. The outer peripheral surface of the bearing and the inner peripheral surface of the bearing portion are in surface contact and are thermally coupled, and the lamp body is characterized by rotating around the heat receiving portion with respect to the heat transfer body.

  In this luminaire, the light source of the lamp is preferably a light emitting diode.

  In this lighting fixture, it is more preferable that the rotation center of the heat transfer body and the heat radiating member is arranged along the vertical direction, and it is more preferable that the heat receiving portion intersects the rotation center.

  In this lighting fixture, the heat dissipating member is disposed so that the center of rotation passes through the center of gravity of the heat dissipating member, and in the outer shape of the heat dissipating member formed by connecting the tip edges of adjacent fins, the outer surface intersects with the center of rotation. The shape of is more preferably one selected from a circle and a regular polygon.

  In this lighting fixture, one end portion is a lighting fixture including an arm that rotatably supports the lamp body through a heat receiving portion of the heat transfer body, the arm rotating integrally with the heat transfer body, and the heat transfer body is It is more desirable to arrange them so as to overlap the arms.

  The lighting fixture includes a mounting member, and is a lighting fixture arranged to be rotatable about the rotation center with respect to the ceiling surface by the mounting member, and the heat dissipation member is arranged below the ceiling surface. Is more desirable.

  This lighting fixture includes a mounting member, and is a lighting fixture that is arranged to be rotatable about the rotation center with respect to the ceiling surface by the mounting member, the heat dissipation member being above the ceiling surface, It is more desirable to arrange in space.

  According to the configuration of the present invention, the light irradiation direction of the lamp body can be changed, and heat can be conducted from the high temperature portion of the lamp body to the heat radiating member.

Embodiment 1 is shown, (a) is a front view, (b) is a side view. The connection site | part of a lamp body and a heat exchanger same as the above is shown, (a) is a rear view, (b) is a side view. Embodiment 2 is shown, (a) is a front view, (b) is a side view. A prior art example is shown, (a) is a perspective view, (b) is a partial sectional view. Another example is shown, (a) is a perspective view, (b) is a partial perspective view. It is a perspective view which shows another prior art example.

(Embodiment 1)
In this embodiment, a spotlight used as a lighting fixture attached to a ceiling is shown as an example. As shown in FIG. 1, the luminaire 1 includes an attachment member (mount) 5 fixed at a fixed position with respect to the ceiling surface 6, and a vertical rotation center perpendicular to the ceiling surface 6 with respect to the attachment member 5. And an arm 7 that rotates around the support member. The lamp body 2 is attached to the lower end portion of the arm 7 so as to be rotatable around the center of rotation along the ceiling surface 6.

  The attachment member 5 includes a rotating cylinder 51 that extends vertically downward with respect to the ceiling surface 6.

  The arm 7 has a U-shaped portion opened downward by two plate-like leg pieces 71 facing each other and a plate-like central piece 72 connecting between one end portions of both leg pieces 72. Furthermore, the arm 7 includes a plate-like attachment piece 73 that integrally protrudes upward from a central portion in the longitudinal direction of the central piece 72. A structure for attaching the lamp body 2 to the arm 7 will be described later.

  The lamp body 2 includes an LED package 21 that includes a light emitting diode (hereinafter abbreviated as “LED”), and a disk-shaped outer shell 22 that houses the LED package 21. The LED package 21 means a light source for illumination in which an LED is mounted on a package substrate and an optical member, a phosphor, or the like is provided. In the lamp body 2, the LED package 21 is mounted on a substrate. As the substrate, an aluminum base substrate having good thermal conductivity is used. The substrate is disposed in the outer shell 22 so that the LED package 21 emits light from the front surface of the outer shell 22 (one surface having a circular outer periphery). A part of the substrate is exposed on the back surface of the outer shell 22.

  By the way, the heat radiating member 3 which is formed of a heat good conductor such as aluminum and has fins is disposed on the upper end portion of the mounting piece 73 of the arm 7. Further, a heat transfer body 4 that transmits heat generated in the lamp body 2 to the heat radiating member 3 is provided.

  The heat dissipating member 3 has a shape in which a plurality of fins formed in a disk shape are arranged at equal intervals in the thickness direction, and the center part of the fins is coupled to a cylindrical support part (not shown). ing. The heat radiation member 3 has a cylindrical outer shape as a whole. A rotating shaft portion (not shown) protrudes from the center of the upper end surface of the heat radiating member 3, and the rotating shaft portion is fitted in the rotating cylinder 51. Thereby, the heat radiating member 3 rotates integrally with the rotating cylinder 51. That is, the heat radiating member 3 rotates with respect to the ceiling surface 6 with the center line passing through the center of gravity as the center of rotation. Since the heat radiating member 3 rotates around the center line passing through the center of gravity, the force required to rotate the heat radiating member 3 can be reduced.

  An attachment piece 73 of the arm 7 is coupled to the lower surface of the heat radiating member 3 so as to be adjacent to the opening of the support portion. That is, the heat radiating member 3 and the arm 7 are integrated, and the heat radiating member 3 and the arm 7 can rotate around the center of rotation in the vertical direction with respect to the ceiling surface 6.

  A heat pipe is used for the heat transfer body 4. The heat pipe is obtained by enclosing a working fluid for heat transport inside a metal tube. The operation of the heat pipe is well known, but will be described briefly. That is, when the hydraulic fluid is heated at one end of the heat transfer body 4, the hydraulic fluid is vaporized and moves to the other end of the heat transfer body 4. The vaporized working fluid is liquefied again by radiating heat at the other end of the heat transfer body 4, and returns to the one end by capillary action due to a porous body, groove, mesh, or the like provided inside the metal tube. The heat transfer body 4 realizes high thermal conductivity by repeating the above-described operation. As the material of the metal tube, copper, aluminum or the like, which is a good heat conductor, is used, and as the working fluid, water, chlorofluorocarbon, alternative chlorofluorocarbon, Fluorinert (registered trademark) or the like is used.

  The heat transfer body 4 has three bent portions that are bent at substantially right angles in the intermediate portion, and each bent portion is bent in the same plane. Further, both end portions of the heat transfer body 4 are extended in directions orthogonal to each other. The outer shape of the cross section orthogonal to the axis of the heat transfer body 4 is circular (see FIG. 2), and one end portion of the heat transfer body 4 is disposed along the direction connecting the lower end portions of both leg pieces 71 of the arm 7. The Below, the part which contacts the bearing part (it mentions later) provided in the lamp | ramp body 2 among the said one end parts is called the heat receiving part 41. FIG.

  As shown in FIG. 2, a fitting groove 221 formed on a straight line passing through the center of the back surface is formed on the back surface of the outer shell 22 in the lamp body 2. A fixing member 24 is coupled to the back surface of the outer shell 22 so as to face the fitting groove 21. The cross-sectional shape of the inner peripheral surface of the fitting groove 221 and the fixing member 24 is circular, and a heat receiving portion that is one end of the heat transfer body 4 in a space surrounded by the fitting groove 221 and the fixing member 24. 41 is sandwiched. Therefore, the lamp body 2 can rotate around the heat receiving portion 41 as a rotation center. That is, the lamp body 2 can rotate around a rotation center substantially parallel to the ceiling surface.

  Here, the fixing member 24 is made of a metal such as aluminum, which is a good thermal conductor, and has a semi-cylindrical contact portion having an inner diameter substantially the same as the outer diameter of the heat receiving portion 41 so that the contact area with the heat receiving portion 41 is increased. 241. In the fixed member 24, fixed end portions 242 are provided to protrude from both end edges in the circumferential direction of the contact portion 241. With the contact portion 241 sandwiching the heat receiving portion 41 between the fitting groove 221 of the outer shell 22, the fixed end portion 232 is in contact with the back surface of the outer shell 22, and the fixed end portion 242 is fixed using the fixture 243. The fixing member 24 is attached to the outer shell 22 while being fixed to the back surface of the outer shell 22. As the fixture 243, a screw, a rivet or the like is used.

  Accordingly, the heat receiving portion 41 of the heat transfer body 4 is in surface contact with the entire inner surface of the bearing portion (the fitting groove 221 and the contact portion 241), and the ratio of the portion of the heat transfer body 4 that is in contact with the back surface of the outer shell 22 is large. Thus, the heat on the back surface of the outer shell 22 can be sufficiently conducted to the heat transfer body 4.

  There is a slight gap (for example, 0.05 mm) between the heat receiving portion 41 of the heat transfer body 4 and the bearing portion of the outer shell 22, and heat radiation grease with good thermal conductivity is injected into the inner surface of the bearing portion. Is done. As a result, the lamp body 2 smoothly rotates with respect to the heat transfer body 4, and the heat on the back surface of the outer shell 22 is efficiently conducted to the heat receiving portion 41 of the heat transfer body 4. For example, silicone is used as the heat dissipation grease.

  Further, both ends of the heat receiving portion 41 protrude from the bearing portion of the outer shell 22, and are held by the leg pieces 71 of the arm 7 so as to maintain the strength necessary for supporting the lamp body 2. In order to reinforce the support of the heat receiving portion 41 with respect to the lamp body 2, a cylindrical shaft sleeve (not shown) may be provided along the heat receiving portion 41 at the distal ends of both leg pieces 71 of the arm 7.

  The other end of the heat transfer body 4 is inserted into the support portion of the heat radiating member 3, and the heat transfer body 4 and the heat radiating member 3 are mechanically coupled and thermally coupled. Below, the part inserted in the support part of the thermal radiation member 3 in the other end part of the heat-transfer body 4 is called the cooling part 42. FIG. The cooling part 42 is press-fitted into the support part of the heat radiating member 3, and the heat transfer body 4 and the heat radiating member 3 are firmly coupled. Here, since the cooling part 42 is in surface contact with the inner surface of the support part of the heat radiating member 3 in a wide area, the ratio of the part in contact with the heat radiating member 3 in the heat transfer body 4 is increased. Heat can be sufficiently transferred to the heat radiating member 3.

  Since the cooling unit 42 is mechanically coupled to the heat radiating member 3, the heat transfer body 4 is integrated with the heat radiating member 3. That is, the heat transfer body 4 of the present embodiment rotates integrally with the heat radiating member 3 and the arm 7 around the rotation center orthogonal to the ceiling surface 6.

  As described above, the heat receiving portion 41 of the heat transfer member 4 and the bearing portion of the lamp body 2 are in surface contact, and the cooling portion 42 of the heat transfer member 4 and the support portion of the heat dissipation member 3 are in surface contact. The heat generated in 2 can be efficiently transmitted to the heat radiating member 3 through the heat transfer body 4, and the heat generated in the lamp body 2 can be radiated from the heat radiating member 3. Further, since the heat transfer body 4 rotates around the rotation center orthogonal to the ceiling surface 6 and the lamp body 2 rotates around the rotation center parallel to the ceiling surface 6, the lamp body 2 has two directions orthogonal to each other. Thus, the light irradiation direction of the lamp body 2 can be freely changed.

  Further, when changing the light irradiation direction by rotating the lamp body 2 around the rotation center parallel to the ceiling surface 6, only the lamp body 2 is rotated, so that compared with the case where the heat radiating member 3 is rotated integrally. Therefore, the light irradiation direction can be easily fixed. In addition, in order to stabilize the light irradiation direction of the lamp body 2, a fixing bolt (not shown) is provided on the contact portion 241 of the fixing member 24, and the fixing bolt is tightened to heat the heat receiving portion of the heat transfer body 4. 41 may be pressed against the fitting groove 221 of the outer shell 22 to fix the lamp body 2.

  In the heat transfer body 4 of the present embodiment, the other end provided with the cooling part 42 is disposed along the attachment piece 73 of the arm 7, and the conduit part 43, which is an intermediate part of the heat transfer body 4, has one leg piece. 71 and the central piece 72 are arranged. Thereby, the heat transfer body 4 is visually integrated with the arm 7, and the design property of the lighting fixture 1 improves. If the arm 7 is formed of a cylindrical member and the inside of the arm 7 is a continuous cavity, the heat transfer body 4 and the arm 7 can be visually compared with each other by arranging the conduit portion 43 in the arm 7. Integrated to improve design.

  The power supply device for supplying power to the LED package 21 of the lamp body 2 may be provided on the ceiling surface 6 as a power supply unit separately from the lamp body 2, or a power circuit is provided in the outer shell 22 of the lamp body 2. You may arrange as. In addition, the heat radiation member 3 may have a shape other than a columnar shape formed by connecting the tip edges of adjacent fins, but in order to reduce the moment during rotation, it is rotationally symmetric with respect to the center line of rotation. (For example, a regular quadrangular prism or a regular pentagonal prism) is desirable. In the heat transfer body 4, the portion other than the heat receiving portion 41 may not have a circular cross section orthogonal to the extending direction, and may be flat, for example. Moreover, the structure covered with the metal and resin may be sufficient as the heat-transfer body 4 and the heat radiating member 3.

  The lamp body 2 is formed with, for example, aluminum having a diameter of 70 mm and a thickness of 15 mm made of aluminum, which is a good thermal conductor, and accommodates seven LED packages 21. In this case, in order to sufficiently dissipate the heat of the back surface of the outer shell 22, the heat radiating member 3 is formed of aluminum, which is a good thermal conductor, with a diameter of 50 mm and a height of 50 mm, and the heat transfer body 4 has an outer diameter of 7 mm. It is desirable to form with the dimension.

  Moreover, although this embodiment illustrated the lighting fixture 1 which is a spotlight directly attached to the ceiling surface 6, you may attach the lighting fixture 1 to the rail provided in the ceiling surface 6. FIG. The rail is an elongated rectangular tube, and is provided on the ceiling surface 6 along its longitudinal direction. The cross section perpendicular to the longitudinal direction of the rail has a shape in which a wall facing the floor surface has an opening in the center. In this case, the lighting fixture 1 uses a rail mounting member instead of the mounting member 5, and the rail mounting member is disposed inside the square tube of the rail. The rotating cylinder 51 protrudes from the opening of the wall from the rail mounting member, and the lighting fixture 1 is mounted so as to be movable along the longitudinal direction of the rail so as to hang down from the rail.

  Moreover, the conductor part which supplies electric power to the lighting fixture 1 is provided in the inside of a rail along a longitudinal direction, and illumination is performed when the contact provided in the rail attachment member contacts the said conductor part electrically. Electric power is supplied to the instrument 1. Thereby, the luminaire 1 can be moved while maintaining electrical connection along the longitudinal direction of the rail, and the irradiation direction of the light of the lamp body 2 can be changed in a wider range.

In the present embodiment, the lighting apparatus 1 is illustrated in which the two rotation axes are orthogonal to each other, and each is in a direction parallel to the direction orthogonal to the ceiling surface 6. Direction and parallel direction. Further, the two rotation axes are not limited to being orthogonal, but may simply intersect or be in a twisted position. The technique described in the present embodiment can be applied to other lighting fixtures such as a standlight.
(Embodiment 2)
As illustrated in FIG. 3, the lighting fixture 1 of the present embodiment is different from the first embodiment in that the heat dissipation member 3 is disposed above the ceiling surface 6 and is disposed in the ceiling space.

  In order to arrange the heat radiating member 3 in the ceiling space, through holes are respectively provided in the attachment member 5 and the ceiling surface 6. The lighting fixture 1 is attached in the state which inserted the conduit | pipe part 43 which is the intermediate part of the heat exchanger 4 in these through-holes. The attachment piece 73 of the arm 7 is rotatably attached to the rotary cylinder 51 of the attachment member 5, and the heat transfer body 4 and the arm 7 are integrated and have a center of rotation in the vertical direction perpendicular to the ceiling surface 6. Rotate around.

  The heat radiation member 3 has an air cooling fan 8 attached to the upper end surface. Due to the effect of the air cooling fan 8, heat can be sufficiently radiated even if the size of the fins of the heat radiating member 3 or the size of the heat radiating member 3 itself is reduced, and the weight of the heat radiating member 3 can be reduced.

  The lamp body 2 is formed with, for example, aluminum having a diameter of 70 mm and a thickness of 15 mm made of aluminum, which is a good thermal conductor, and accommodates seven LED packages 21. In this case, in order to sufficiently dissipate the heat of the back surface of the outer shell 22, the heat radiating member 3 is formed of aluminum, which is a good thermal conductor, with a diameter of 50 mm and a height of 20 mm, and the heat transfer body 4 has an outer diameter of 7 mm. It is desirable to form with the dimension.

  In addition, wind noise is generated when the air cooling fan 8 is operating, but the noise is blocked by the ceiling and transmitted to the space below the ceiling surface 6. Moreover, since the heat radiating member 3 becomes invisible from the space below the ceiling surface 6, the design of the lighting fixture 1 is improved.

  Other configurations and operations are the same as those in the first embodiment.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Lamp body 22 Outer shell 3 Heat radiating member 4 Heat transfer body 41 Heat receiving part 42 Cooling part 5 Mounting member 6 Ceiling surface 7 Arm

Claims (7)

  A lamp body including a light source and an outer shell for housing the light source, a heat dissipating member formed of a good heat conductor and having fins, and a heat transfer member including a heat pipe that conducts heat from the lamp body to the heat dissipating member, The heat dissipating member is attached to the cooling part at one end of the heat transfer body, the heat transfer body and the heat dissipating member rotate together, and the heat receiving part at the other end of the heat transfer body has a cross section The outer shape of the lamp body is circular, and a bearing portion in which the heat receiving portion is fitted is provided in a portion of the outer body of the lamp body that becomes high temperature due to light emission of the light source, and the bearing portion is sized to the heat receiving portion. The outer peripheral surface of the heat receiving portion and the inner peripheral surface of the bearing portion are in surface contact and thermally coupled, and the lamp body is centered on the heat receiving portion with respect to the heat transfer body. A lighting apparatus characterized by rotating.   The lighting apparatus according to claim 1, wherein the light source of the lamp body is a light emitting diode.   3. The lighting device is arranged such that a rotation center of the heat transfer body and the heat radiating member is along a vertical direction, and the heat receiving portion intersects the rotation center. The lighting fixture as described in.   The heat dissipating member is disposed so that the rotation center passes through the center of gravity of the heat dissipating member, and in the outer shape of the heat dissipating member formed by connecting the tip edges of adjacent fins, the outer surface of the heat dissipating member intersects with the rotation center. The lighting fixture according to claim 3, wherein the shape is one selected from a circle and a regular polygon.   One end portion of the lighting fixture includes an arm that rotatably supports the lamp body via the heat receiving portion of the heat transfer body, the arm rotating integrally with the heat transfer body, and the heat transfer body The lighting device according to claim 3, wherein the lighting fixture is disposed so as to overlap the arm.   An illumination fixture including an attachment member and arranged to be rotatable about the rotation center with respect to the ceiling surface by the attachment member, wherein the heat dissipation member is arranged below the ceiling surface. The lighting fixture according to claim 5. The lighting device includes an attachment member, and is arranged to be rotatable about the rotation center with respect to the ceiling surface by the attachment member, wherein the heat dissipation member is above the ceiling surface and is in a ceiling space. The lighting fixture according to claim 5, wherein the lighting fixture is arranged.

Images