Lighting fixture

Abstract

This lighting fixture (1) comprises a mounting fixture (20) on which a lamp (10) is mounted and which is embedded in a ceiling. The mounting fixture (20) has a fixture body (21) and a heat dissipation mechanism (23) provided on the inside surface of the fixture body (21). The heat dissipation mechanism (23) is in contact with the lamp (10).

Description

lighting fixtures

[0001] The present disclosure relates to lighting fixtures such as downlights.

[0002] 2. Description of the Related Art Downlights are known as a type of lighting fixture that are embedded in a ceiling and are disposed in a through-hole provided in the ceiling, for example.

[0003] In recent years, from the viewpoints of energy saving and long life, LED light sources constituted by light-emitting diodes (LEDs) have been used as light sources for lighting fixtures. LED light sources can be made to emit light by a power supply circuit constituted by a plurality of circuit elements. Conventionally, downlights using LED light sources have been known that incorporate LED light sources.

[0004] However, since the installation and replacement of downlights requires a licensed electrician, for downlights with built-in LED light sources, even if a user wants to change the color and light distribution angle of the illumination light after installing the downlight, the user cannot change the color and light distribution angle of the illumination light because the user cannot replace the light source part.

[0005] Therefore, a downlight has been proposed in which the lamp having an LED light source and the mounting fixture are separated, and the lamp can be attached to and detached from the mounting fixture. Patent Document 1 discloses an example of this type of downlight, a lighting fixture having a socket to which a lamp having a GX53 type base can be detachably attached. In such a lighting fixture, the color and luminous intensity distribution angle of the illumination light can be changed by replacing the lamp.

[0006] JP 2010-129489 A

[0007] When a lighting fixture is turned on, heat is generated from the light source (light-emitting section) and circuit elements. Therefore, the lighting fixture needs to dissipate the heat generated by the light source and circuit elements. In particular, LEDs have the characteristic that their heat generation increases their temperature and reduces their light output, so in lighting fixtures that use LED light sources, it is important to dissipate the heat generated by the light source.

[0008] However, while there is a demand for smaller lighting fixtures, it is difficult for small mounting fixtures to provide sufficient heat dissipation performance.

[0009] Furthermore, while the lamp's heat can be conducted to the fixture by tightly contacting the outer surface of the lamp with the inner surface of the fixture body, to facilitate lamp replacement, it is necessary to leave a gap between the lamp's outer surface and the inner surface of the fixture body large enough for a user's fingers to fit in. This makes it impossible to tightly contact the lamp's outer surface with the inner surface of the fixture body.

[0010] The present disclosure has been made in consideration of such problems, and aims to provide a lighting fixture that can efficiently dissipate heat generated by a lamp without compromising the ease of lamp replacement.

[0011] One aspect of a lighting fixture according to one aspect of the present disclosure includes a mounting fixture to which a lamp is attached and which is recessed into a ceiling, the mounting fixture having a fixture body and a heat dissipation mechanism provided on the inner surface of the fixture body, the heat dissipation mechanism being in contact with the lamp.

[0012] According to the present disclosure, heat generated by a lamp can be efficiently dissipated without compromising ease of lamp replacement.

[0013] FIG. 1 is a cross-sectional view of a lighting fixture according to embodiment 1. FIG. 2 is a diagram showing the lighting fixture according to embodiment 1 in a state where a lamp has been removed from a mounting fixture. FIG. 3 is a diagram showing the configuration of a socket in the lighting fixture according to embodiment 1. FIG. 4 is a cross-sectional view of the mounting fixture taken along line IV-IV in FIG. 2. FIG. 5 is a cross-sectional view of a lighting fixture according to a modification of embodiment 1. FIG. 6 is a cross-sectional view of a lighting fixture according to embodiment 2. FIG. 7 is a cross-sectional view of the lighting fixture according to embodiment 2 in a state where a lamp has been removed from a mounting fixture. FIG. 8 is a cross-sectional view of the mounting fixture taken along line VIII-VIII in FIG. 7. FIG. 9 is a cross-sectional view of a lighting fixture according to a modification of embodiment 2. FIG. 10 is a cross-sectional view of a lighting fixture according to embodiment 3. FIG. 11 is a cross-sectional view of the lighting fixture taken along line XI-XI in FIG. 10. FIG. 12 is a cross-sectional view of the lighting fixture according to embodiment 3 in a state where a lamp has been removed from a mounting fixture. FIG. 13 is a cross-sectional view of the lighting fixture taken along line XIII-XIII in FIG. 12.

[0014] One aspect of a lighting fixture according to the present disclosure comprises a mounting fixture to which a lamp is attached and which is recessed into a ceiling, the mounting fixture having a fixture body and a heat dissipation mechanism provided on the inner surface of the fixture body, the heat dissipation mechanism being in contact with the lamp.

[0015] This configuration allows the heat generated by the lamp to be efficiently dissipated without compromising ease of lamp replacement.

[0016] In addition, in one aspect of the lighting device according to the present disclosure, the heat dissipation mechanism may be at least one protrusion, and the at least one protrusion may have a tip that contacts a side surface of the lamp.

[0017] This configuration allows the lamp to be easily replaced after being attached to the fixture while still ensuring contact between the lamp and the fixture body.

[0018] In one aspect of the lighting fixture according to the present disclosure, the at least one protrusion may protrude inward from an inner surface of the fixture body.

[0019] This configuration makes it possible to easily attach the lamp to the mounting fixture when installing the lamp in the mounting fixture, and also makes it easy to ensure contact between the lamp and the fixture body after the lamp is attached to the mounting fixture.

[0020] In one aspect of the lighting fixture according to the present disclosure, the at least one protrusion may be elastically deformable. Specifically, the lamp may be configured to be inserted into the fixture body in a first direction when attached to the fixture body. The at least one protrusion may be deformable in the first direction.

[0021] With this configuration, the protrusion is pushed by the lamp and elastically deforms when the lamp is inserted into the fixture body, so the protrusion does not get in the way when the lamp is installed. This does not impair ease of lamp replacement. Furthermore, after the lamp is installed in the fixture body, the bent protrusion comes into contact with the side of the lamp, allowing heat generated by the lamp to be efficiently conducted to the fixture body. This allows for even more efficient dissipation of heat generated by the lamp.

[0022] In addition, in one aspect of the lighting device according to the present disclosure, the at least one protrusion may consist of a plurality of protrusions, and the plurality of protrusions may be arranged along the axial direction of the central axis of the device body.

[0023] This configuration allows the contact area between the heat dissipation mechanism and the fixture body to be increased, thereby enabling the heat generated by the lamp to be dissipated more efficiently.

[0024] In one aspect of the lighting fixture according to the present disclosure, the at least one protrusion may deform in a direction perpendicular to the central axis of the fixture body.

[0025] This configuration allows the protrusion to be elastically deformed in a direction perpendicular to the central axis of the instrument body.

[0026] In addition, in one aspect of the lighting fixture according to the present disclosure, the at least one protrusion is made up of a plurality of protrusions, which are arranged along the circumferential direction of the inner surface of the fixture body, and each of the plurality of protrusions is a folded plate-shaped member, and by rotating the lamp when attaching the lamp to the fixture body, the folded plurality of protrusions deform so as to extend in the rotational direction of the lamp.

[0027] With this configuration, the rotation of the lamp when it is attached to the fixture can be used to elastically deform the plurality of protrusions, bringing the lamp into contact with the plurality of protrusions.

[0028] In addition, in one aspect of the lighting fixture according to the present disclosure, the lamp may have a base, and the mounting fixture may have a socket to which the base of the lamp is detachably attached.

[0029] This configuration allows the lamp to be easily replaced by simply attaching and detaching the lamp base to the socket.

[0030] In addition, in one aspect of the lighting fixture according to the present disclosure, the lamp may have an LED light source.

[0031] LEDs have the characteristic that their temperature rises due to heat generated by the LED itself, resulting in a decrease in light output. However, the heat generated by the LED light source can be efficiently dissipated through a heat dissipation mechanism, thereby preventing a decrease in the light output of lamps that have LED light sources.

[0032] (Embodiments) Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that each of the embodiments described below represents a specific example of the present disclosure. Therefore, the numerical values, shapes, materials, components, arrangement positions and connection forms of the components, etc. shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Therefore, among the components in the following embodiments, components that are not described in the independent claims that represent the superordinate concept of the present disclosure will be described as optional components.

[0033] Furthermore, each figure is a schematic diagram and is not necessarily an exact illustration. Therefore, the scales and the like do not necessarily match in each figure. In each figure, the same reference numerals are used to denote substantially the same components, and redundant explanations will be omitted or simplified.

[0034] Furthermore, in this specification, the terms "above," "up," "below," and "below" do not refer to the upward direction (vertically upward) and downward direction (vertically downward) in absolute spatial recognition, but are used as terms defined by a relative positional relationship. Furthermore, the terms "above," "up," "below," and "below" are used not only when two components are arranged with a gap between them and another component exists between them, but also when two components are arranged in contact with each other.

[0035] (Embodiment 1) First, a lighting fixture 1 according to embodiment 1 will be described with reference to Figures 1 to 4. Figure 1 is a cross-sectional view of the lighting fixture 1 according to embodiment 1. Figure 2 is a diagram showing the lighting fixture 1 according to embodiment 1 with the lamp 10 removed from the mounting fixture 20. Figures 1 and 2 show a cross-section taken along a plane passing through and parallel to the central axis of the mounting fixture 20. Figure 3 is a diagram showing the configuration of the socket 22 in the lighting fixture 1 according to embodiment 1. Figure 4 is a cross-sectional view of the mounting fixture 20 taken along line IV-IV in Figure 2. Note that the socket 22 is not shown in Figure 4.

[0036] As shown in FIGS. 1 and 2, the lighting fixture 1 includes a lamp 10 and a mounting fixture 20 to which the lamp 10 is attached.

[0037] The lighting fixture 1 is a recessed lighting fixture that is installed by being embedded in a construction material such as the ceiling of a building, and emits illumination light downward (to the floor, wall, etc.). As shown in Fig. 1 , the lighting fixture 1 in this embodiment is a downlight installed in a through hole 101 provided in a ceiling 100, and emits illumination light toward the floor. The lighting fixture 1 emits light emitted from a lamp 10 as illumination light. The through hole 101 in the ceiling 100 has a circular shape in a plan view.

[0038] The lamp 10 has a housing 11, a light-emitting unit 12, a light-transmitting cover 13, two power supply pins 14 that serve as a base, and a power supply unit 15. In this embodiment, the lamp 10 is a lamp with a flat, thin structure that has an overall disk-like or flat shape.

[0039] The housing 11 houses the light-emitting unit 12 and the power supply unit 15. The light-emitting unit 12 and the power supply unit 15 are supported by the housing 11. The housing 11 may be made of either resin or metal. The power supply unit 15 is a power supply circuit that generates power for causing the light-emitting unit 12 to emit light. For example, the power supply unit 15 converts AC power (e.g., commercial AC power of 100 V) received via the two power feed pins 14 into DC power and supplies the DC power to the light-emitting unit 12. The power supply unit 15 includes, for example, a circuit board and a plurality of circuit elements mounted on the circuit board.

[0040] The light emitting unit 12 emits light using power supplied from the power supply unit 15. The light emitting unit 12 emits, for example, white light. In this case, the lamp 10 irradiates white light as illumination light.

[0041] In this embodiment, the light-emitting unit 12 is composed of an LED. Therefore, the lamp 10 is an LED lamp. As an example, the light-emitting unit 12 has a substrate and one or more LED elements mounted on the substrate. The LED elements may be surface-mounted LED packages or LED chips. When the LED elements are LED chips, the LED chips are covered with a sealing member. In this case, when a blue LED chip that emits blue light is used as the LED chip, the blue LED chip is sealed with a sealing member made of a resin material containing a yellow phosphor. This causes white light to be emitted from the sealing member.

[0042] When the light-emitting unit 12 emits light, heat is generated from the light-emitting unit 12 and heat is generated from the power supply unit 15. Specifically, when the light-emitting unit 12 emits light, heat is generated from the LED of the light-emitting unit 12 and heat is generated from the circuit elements of the power supply unit 15.

[0043] The light-emitting unit 12 is covered with a light-transmitting cover 13. The light-transmitting cover 13 is a light-transmitting member having light-transmitting properties. Therefore, light from the light-emitting unit 12 that enters the inner surface of the light-transmitting cover 13 passes through the light-transmitting cover 13 and is emitted to the outside of the light-transmitting cover 13. The light-transmitting cover 13 is attached to the housing 11. Specifically, the light-transmitting cover 13 is attached to the open end of the opening of the housing 11.

[0044] The light-transmitting cover 13 may be made of a light-transmitting resin material such as acrylic or polycarbonate, or a light-transmitting material such as glass. The light-transmitting cover 13 is a milky white diffusion cover that has light diffusing properties, but may also be a transparent cover that does not have light diffusing properties.

[0045] The power feed pins 14 are electrically conductive pins. In this embodiment, the power feed pins 14 are made of a metal material. The power feed pins 14 receive power from outside the lamp 10 to cause the light emitting unit 12 to emit light. For example, two power feed pins 14 receive AC power from the socket 22 of the mounting fixture 20. The two power feed pins 14 and the power supply unit 15 are electrically connected by lead wires (not shown) or the like, and the AC power received by the two power feed pins 14 is supplied to the power supply unit 15 via the lead wires. In this embodiment, each of the two power feed pins 14 is a pin with a T-shaped cross section and a disc-shaped enlarged diameter portion at its tip.

[0046] The two power feed pins 14 are connection pins for connecting the lamp 10 to a socket 22 of the mounting fixture 20. Each power feed pin 14 is electrically and mechanically connected to the socket 22. As shown in Fig. 3, each power feed pin 14 is engaged with a pin receiving hole 22a formed in the socket 22, and is electrically and mechanically connected to a terminal board (not shown) arranged within the socket 22. The lamp 10 is held in the socket 22 by connecting the power feed pins 14 to the socket 22.

[0047] The two power feed pins 14 form the base of the lamp 10 and are detachably attached to the socket 22. In this embodiment, the base of the lamp 10 is, for example, a GX53 type base. Therefore, the lamp 10 has a protrusion 16 as part of the base in addition to the two power feed pins 14. This protrusion 16 is part of the housing 11 and is provided on the surface of the housing 11 opposite the side facing the translucent cover 13. The power supply 15 is housed in the space inside this protrusion 16.

[0048] Furthermore, this protrusion 16 forms a step on the surface of the housing 11 opposite the light-transmitting cover 13 side. The two feed pins 14 are provided on a step surface that is one step lower than this step. In other words, the two feed pins 14 are provided on the sides of the protrusion 16. Specifically, the two feed pins 14 are arranged around the protrusion 16 at 180-degree intervals. In other words, the two feed pins 14 are arranged in positions that face each other with the protrusion 16 in between.

[0049] The lamp 10 configured as described above is attached to the mounting fixture 20. Specifically, the lamp 10 is inserted into the fixture body 21 of the mounting fixture 20 and attached to the socket 22 of the mounting fixture 20. For example, if the lighting fixture 1 is installed on a ceiling, as shown in Fig. 1, the lamp 10 is attached to the socket 22 so that the translucent cover 13 faces the floor (i.e., so that the two power supply pins 14 face the ceiling). Therefore, the lamp 10 is inserted vertically into the mounting fixture 20.

[0050] The lamp 10 is detachably mounted in the socket 22. That is, the lamp 10 can be attached to and detached from the socket 22. This allows the lamp 10 to be replaced. For example, the lamp 10 can be attached to the socket 22 by inserting it into the fixture body 21 and rotating it around a horizontal plane. Specifically, the lamp 10 can be attached to the socket 22 by grasping the outer surface of the lamp 10 with one hand, inserting the power supply pin 14 of the lamp 10 into the pin receiving hole 22a of the socket 22, and rotating the lamp 10 clockwise. On the other hand, to remove the lamp 10 from the socket 22, the lamp 10 can be removed from the socket 22 by rotating the lamp 10 counterclockwise.

[0051] The mounting fixture 20 is embedded in the ceiling 100. Specifically, the mounting fixture 20 is embedded in a through-hole 101 provided in the ceiling 100. As shown in FIGS. 1 and 2 , the mounting fixture 20 has a fixture body 21, a socket 22, and a heat dissipation mechanism 23.

[0052] The fixture body 21 is embedded in a through-hole 101 provided in a ceiling 100. The fixture body 21 has a cylindrical shape with a bottom, and includes a cylindrical frame body 21a and a top plate 21b.

[0053] The frame body 21a is a cylindrical member. The frame body 21a is placed in a through-hole 101 in the ceiling 100 and fixed to the ceiling 100. Although not shown, the frame body 21a is fixed to the ceiling 100 by a mounting spring or the like fixed to the frame body 21a. In this embodiment, the outer peripheral surface of the frame body 21a contacts the inner surface of the through-hole 101 in the ceiling 100, but this is not limited to this.

[0054] The frame 21a houses the lamp 10. The lamp 10 is surrounded by the frame 21a. Specifically, the outer peripheral surface of the lamp 10 faces the inner peripheral surface of the frame 21a. However, the inner peripheral surface of the frame 21a does not contact the lamp 10, and a gap exists between the inner peripheral surface of the frame 21a and the outer surface of the lamp 10. The gap between the inner peripheral surface of the frame 21a and the outer surface of the lamp 10 is, for example, 5 mm to 20 mm, but is not limited to this. From the perspective of facilitating the replacement of the lamp 10, it is preferable that the gap between the inner peripheral surface of the frame 21a and the outer surface of the lamp 10 be at least wide enough for a person's finger to fit through.

[0055] A flange-shaped collar is provided at the lower open end of the frame body 21 a. The collar of the frame body 21 a is formed so as to protrude outward from the outer surface of the frame body 21 a. The collar of the frame body 21 a abuts against the underside of the ceiling 100.

[0056] The frame 21a is made of a metal material such as aluminum or iron, or a resin material with high thermal conductivity. In this embodiment, the frame 21a is made of a metal material containing aluminum as a main component. As an example, the frame 21a is made of aluminum die-cast.

[0057] The top plate 21b is a plate-shaped member. The top plate 21b is fixed to the frame 21a so as to cover the upper opening of the frame 21a. As an example, the top plate 21b is disk-shaped. The top plate 21b is a metal plate made of a metal material such as aluminum or iron, or a resin plate made of a resin material with high thermal conductivity. In this embodiment, the top plate 21b is an aluminum plate made of a metal material containing aluminum as a main component.

[0058] The frame body 21a and the top plate 21b are preferably made of the same material, but may be made of different materials. The frame body 21a and the top plate 21b may be integrally formed rather than being separate bodies. In this case, the device body 21, in which the frame body 21a and the top plate 21b are integrated, can be formed by press working such as deep drawing.

[0059] The socket 22 is attached to the fixture body 21. Specifically, the socket 22 is fixed to the inner surface of the top plate 21b. For example, the socket 22 and the top plate 21b are fixed together by screws, but the fixing method is not limited to this.

[0060] The socket 22 functions to hold the lamp 10 and to supply power to the lamp 10. Specifically, the socket 22 functions as a socket compatible with a GX53-type lamp base. The socket 22 is made of an insulating resin material. The socket 22 has a circular shape in plan view.

[0061] The base of the lamp 10 is removably attached to the socket 22. Specifically, the socket 22 is provided with two pin receiving holes 22a into which the two power feed pins 14 that make up the base of the lamp 10 are engaged, and the two power feed pins 14 are removably attached to the socket 22. The socket 22 also has a recess 22b that receives the protrusion 16 of the lamp 10. When the lamp 10 is attached to the socket 22, the protrusion 16 of the lamp 10 is housed in the recess 22b.

[0062] The two pin receiving holes 22a correspond one-to-one to the two power supply pins 14 of the lamp 10. Specifically, the two pin receiving holes 22a are provided at 180-degree intervals around the circumference of the socket 22. Each pin receiving hole 22a is composed of a large-diameter circular hole and an elongated hole connected to the circular hole. The elongated hole of the pin receiving hole 22a extends in the direction of rotation when the lamp 10 is rotated to attach it to the socket 22. For example, when attaching the lamp 10 to the socket 22, the large-diameter portion of the power supply pin 14 of the lamp 10 is inserted into the circular hole of the pin receiving hole 22a, and then the lamp 10 is rotated to move the power supply pin 14 along the elongated hole into the pin receiving hole 22a. As a result, the power supply pin 14 is engaged with the pin receiving hole 22a and electrically and mechanically connected to the terminal strip arranged in the socket 22. When the power supply pin 14 comes into contact with the terminal board, power is supplied to the lamp 10 .

[0063] The heat dissipation mechanism 23 dissipates heat generated by the lamp 10. Specifically, the heat dissipation mechanism 23 dissipates heat generated by the light emitting unit 12 and the power supply unit 15.

[0064] The heat dissipation mechanism 23 is provided on the inner surface of the fixture body 21. In the present embodiment, the heat dissipation mechanism 23 is constituted by protrusions 23a. Specifically, the heat dissipation mechanism 23 is constituted by a plurality of protrusions 23a arranged at predetermined intervals along the axial direction of the central axis of the fixture body 21. For example, the heat dissipation mechanism 23 is constituted by four protrusions 23a, but is not limited to this.

[0065] Each of the plurality of protrusions 23a protrudes inward from the inner surface of the instrument body 21. Each of the plurality of protrusions 23a has a cantilever beam structure having one end (first end) fixed to the inner circumferential surface of the frame 21a of the instrument body 21 and the other end (second end) which is a free end located on the opposite side from the inner circumferential surface of the frame 21a. As shown in FIG. 4 , each of the protrusions 23a is annular with a constant width and is provided around the entire inner circumferential surface of the frame 21a. Each of the protrusions 23a is flat with a thickness smaller than its width and extends so as to widen in a direction perpendicular to the central axis of the instrument body 21.

[0066] The heat dissipation mechanism 23 is in contact with the lamp 10. This allows heat generated by the lamp 10 to be conducted to the fixture body 21 via the heat dissipation mechanism 23. In this embodiment, the heat dissipation mechanism 23 is in contact with the side surface of the lamp 10.

[0067] Specifically, the tips of the multiple protrusions 23a that make up the heat dissipation mechanism 23 are in contact with the side surface of the lamp 10. In other words, the free ends of the protrusions 23a are in contact with the side surface of the lamp 10. In this embodiment, the tips of the multiple protrusions 23a are in contact with the outer surface of the housing 11 of the lamp 10.

[0068] The plurality of protrusions 23a are preferably made of a material with high thermal conductivity, such as a metal material. This allows heat generated by the lamp 10 to be efficiently conducted to the fixture body 21 via the plurality of protrusions 23a. The thermal conductivity of each protrusion 23a is, for example, not limited to, 50 (W / m·K) or more and 500 (W / m·K). In this embodiment, the plurality of protrusions 23a are made of copper. Furthermore, the larger the contact area between each protrusion 23a and the lamp 10, the more effectively the heat dissipation effect can be improved.

[0069] When the lamp 10 is inserted into the frame 21a of the fixture body 21 and attached to the socket 22, the tips of the multiple protrusions 23a slide along the side of the lamp 10. At this time, it is preferable that the multiple protrusions 23a be elastically deformed. This allows the tips of the multiple protrusions 23a to elastically deform when the lamp 10 is attached to the socket 22, facilitating contact between the lamp 10 and the multiple protrusions 23a, and when the lamp 10 is removed from the socket 22, the multiple protrusions 23a return to their original state due to their elastic restoring force. This allows the lamp 10 to be replaced many times.

[0070] As described above, the lighting fixture 1 according to this embodiment comprises a mounting fixture 20 to which the lamp 10 is removably attached, and the mounting fixture 20 has a fixture body 21, a socket 22, and a heat dissipation mechanism 23 provided on the inner surface of the fixture body 21, and the heat dissipation mechanism 23 is in contact with the lamp 10.

[0071] With this configuration, heat generated by the lamp 10 can be conducted to the fixture body 21 via the heat dissipation mechanism 23, and the heat generated by the lamp 10 can be dissipated into the air layer from the surface of the fixture body 21. Specifically, heat generated by the light-emitting unit 12 and the power supply unit 15 of the lamp 10 can be conducted to the fixture body 21 via the heat dissipation mechanism 23 and dissipated.

[0072] Furthermore, in the lighting fixture 1 according to this embodiment, the lamp 10 and the fixture body 21 are not thermally coupled by tightly contacting the side surface of the lamp 10 with the inner circumferential surface of the fixture body 21, but are thermally coupled by sandwiching the heat dissipation mechanism 23 between the lamp 10 and the fixture body 21. This ensures a certain gap between the side surface of the lamp 10 and the inner circumferential surface of the fixture body 21, making it easy to attach the lamp 10 to the mounting fixture 20. In other words, the lamp 10 can be easily replaced.

[0073] In this way, lighting fixture 1 according to this embodiment can efficiently dissipate heat generated by lamp 10 without compromising ease of lamp 10 replacement.

[0074] In addition, in lighting fixture 1 according to this embodiment, heat dissipation mechanism 23 is protrusion 23 a , and the tip of protrusion 23 a is in contact with the side surface of lamp 10 .

[0075] This configuration allows the lamp 10 to be easily replaced while still ensuring contact between the lamp 10 and the fixture body 21 after the lamp 10 is attached to the fixture 20.

[0076] Furthermore, in the lighting fixture 1 according to this embodiment, the protrusion 23 a protrudes from the inner surface of the fixture body 21 toward the inside of the fixture body 21 .

[0077] This configuration makes it possible to easily attach the lamp 10 to the mounting fixture 20 when attaching the lamp 10 to the mounting fixture 20, and also makes it possible to easily ensure contact between the lamp 10 and the fixture body 21 after the lamp 10 is attached to the mounting fixture 20.

[0078] In addition, in the lighting fixture 1 according to this embodiment, the lamp 10 has a base, and the mounting fixture 20 has a socket 22 to which the base of the lamp 10 is detachably attached.

[0079] With this configuration, the lamp 10 can be easily replaced by attaching and detaching the base of the lamp 10 to the socket 22.

[0080] In the lighting fixture 1 according to the present embodiment, each of the plurality of protrusions 23a constituting the heat dissipation mechanism 23 is annular and has a constant width, and is provided around the entire inner circumferential surface of the frame body 21a. However, this is not limited to this. For example, as shown in FIG. 5 , the plurality of protrusions 23aA constituting the heat dissipation mechanism 23A may be provided in both the axial direction of the central axis of the fixture body 21 and the circumferential direction of the frame body 21a. In other words, the plurality of protrusions 23aA are arranged like brush bristles. This makes the protrusions 23aA more elastically deformable than the protrusions 23a in FIG. 4 , thereby facilitating attachment of the lamp 10 to the fixture body 21 with less force and increasing the contact area between the lamp 10 and the fixture body 21. This allows for easy replacement of the lamp 10 and more efficient heat dissipation from the lamp 10.

[0081] (Embodiment 2) Next, a lighting fixture 1B according to embodiment 2 will be described with reference to Figures 6 to 8. Figure 6 is a cross-sectional view of lighting fixture 1B according to embodiment 2. Figure 7 is a diagram showing lighting fixture 1B according to embodiment 2 with lamp 10 removed from mounting fixture 20B. Figures 6 and 7 show a cross-section taken along a plane passing through and parallel to the central axis of mounting fixture 20B. Figure 8 is a cross-sectional view of mounting fixture 20B taken along line VIII-VIII in Figure 7. Note that the socket 22 is not shown in Figure 8.

[0082] 6 to 8, lighting fixture 1B according to the present embodiment, like lighting fixture 1 according to embodiment 1, includes lamp 10 and mounting fixture 20B to which lamp 10 is attached. In this embodiment, mounting fixture 20B also includes fixture body 21, socket 22, and heat dissipation mechanism 23B, which is configured from a plurality of protrusions 23aB arranged along the axial direction of the central axis of fixture body 21. Furthermore, the plurality of protrusions 23aB protrude inward from the inner surface of fixture body 21, and the tip of each protrusion 23aB contacts the side surface of lamp 10.

[0083] In this embodiment, each of the plurality of protrusions 23aB has a cantilever beam structure having one end (first end) fixed to the inner circumferential surface of the frame 21a of the instrument body 21 and the other end (second end) which is a free end located on the opposite side from the inner circumferential surface of the frame 21a. As shown in FIG. 8 , each protrusion 23aB is annular with a constant width and is provided around the entire inner circumferential surface of the frame 21a. Each protrusion 23aB is flat with a thickness smaller than its width and extends in a direction perpendicular to the central axis of the instrument body 21.

[0084] The lighting fixture 1B according to the present embodiment differs from the lighting fixture 1 according to the first embodiment in the shape of the protrusions 23aB when they come into contact with the lamp 10. Specifically, the protrusions 23a in the first embodiment do not deform so as to bend when the lamp 10 is inserted, whereas the protrusions 23aB in the present embodiment deform so as to bend when the lamp 10 is inserted. More specifically, in the present embodiment, each of the plurality of protrusions 23aB is a valve that elastically deforms. The lamp 10 is configured to be inserted into the fixture body 21 in a first direction when attached to the fixture body 21. The plurality of protrusions 23aB are deformable in this first direction.

[0085] For example, when the lamp 10 is inserted into the frame 21a of the fixture body 21 and attached to the socket 22, the free ends of the plurality of protrusions 23aB are pushed by the lamp 10 and bent in the insertion direction (first direction) of the lamp 10. Therefore, the plurality of protrusions 23aB come into contact with the side of the lamp 10 with their tips bent. In this case, the plurality of protrusions 23aB are elastically deformed, and therefore, when the lamp 10 is removed from the socket 22, the plurality of protrusions 23aB return to their original state due to their elastic restoring force. Therefore, the lamp 10 can be replaced many times.

[0086] In this embodiment, the plurality of protrusions 23aB are also made of a metal material such as copper, etc. The plurality of protrusions 23aB are also made of a flexible elastic member.

[0087] As described above, lighting fixture 1B according to this embodiment, like embodiment 1 above, includes mounting fixture 20B to which lamp 10 is detachably attached, and mounting fixture 20B has fixture body 21, socket 22, and heat dissipation mechanism 23B provided on the inner surface of fixture body 21, with heat dissipation mechanism 23B in contact with lamp 10.

[0088] This configuration allows the heat generated by the lamp 10 to be efficiently dissipated without compromising ease of lamp replacement.

[0089] In this embodiment, the projections 23aB constituting the heat dissipation mechanism 23B are elastically deformable valves. The lamp 10 is configured to be inserted into the fixture body 21 in a first direction when attached to the fixture body 21. The multiple projections 23aB are deformable in this first direction.

[0090] With this configuration, when the lamp 10 is inserted into the fixture body 21, the free end of the protrusion 23aB is pushed by the lamp 10, elastically deforming and bending, so that the protrusion 23aB does not get in the way when the lamp 10 is attached. This does not impair ease of lamp 10 replacement. Furthermore, after the lamp 10 is attached to the fixture body 21, the bent free end of the protrusion 23aB comes into contact with the side surface of the lamp 10, allowing heat generated by the lamp 10 to be efficiently conducted to the fixture body 21. This allows heat generated by the lamp 10 to be dissipated even more efficiently.

[0091] In this embodiment, a plurality of protrusions 23 aB (valves) are arranged along the axial direction of the central axis of the instrument body 21 .

[0092] This configuration allows the contact area between the heat dissipation mechanism 23B and the fixture body 21 to be increased, so that the heat generated by the lamp 10 can be dissipated more efficiently.

[0093] In the lighting fixture 1B according to the present embodiment, each of the plurality of protrusions 23aB constituting the heat dissipation mechanism 23B is annular and has a constant width, and is provided around the entire inner circumferential surface of the frame body 21a. However, this is not limited to this. For example, as shown in FIG. 9 , the plurality of protrusions 23aC constituting the heat dissipation mechanism 23C may be provided in both the axial direction of the central axis of the fixture body 21 and the circumferential direction of the frame body 21a. In other words, the plurality of protrusions 23aC are arranged like brush bristles. This makes the protrusions 23aC more elastically deformable than the protrusions 23aB in FIG. 8 , thereby facilitating attachment of the lamp 10 to the fixture body 21 with less force and increasing the contact area between the lamp 10 and the fixture body 21. This facilitates lamp replacement and more efficiently dissipates heat generated by the lamp 10.

[0094] (Embodiment 3) Next, a lighting fixture 1D pertaining to embodiment 3 will be described with reference to FIGS. 10 to 13. FIG. 10 is a cross-sectional view of the lighting fixture 1D pertaining to embodiment 3. FIG. 11 is a cross-sectional view of the lighting fixture 1D taken along line XI-XI in FIG. 10. FIG. 12 is a cross-sectional view of the lighting fixture 1D pertaining to embodiment 3 when the lamp 10 is removed from the mounting fixture 20D. FIG. 13 is a cross-sectional view of the lighting fixture 1D taken along line XIII-XIII in FIG. 12. Note that FIGS. 10 and 12 show cross sections taken along a plane passing through and parallel to the central axis of the mounting fixture 20D. Specifically, FIG. 10 shows a cross-section taken along line X-X in FIG. 11, and FIG. 12 shows a cross-section taken along line XII-XII in FIG. 13.

[0095] 10 to 13, lighting fixture 1D according to the present embodiment, like lighting fixture 1 according to embodiment 1, includes lamp 10 and mounting fixture 20D to which lamp 10 is attached. In the present embodiment, mounting fixture 20D also includes fixture body 21, socket 22, and heat dissipation mechanism 23D, which is composed of a plurality of protrusions 23aD that protrude inward from the inner surface of fixture body 21, with the tips of each protrusion 23aD contacting the side surface of lamp 10.

[0096] Lighting fixture 1D according to the present embodiment differs from lighting fixture 1 according to the above-described first embodiment in the structure of multiple protrusions 23aD that constitute heat dissipation mechanism 23D. Specifically, while multiple protrusions 23a in the above-described first embodiment were arranged along the axial direction of the central axis of fixture body 21, multiple protrusions 23aD in the present embodiment are provided along the circumferential direction of the inner surface of fixture body 21. Furthermore, while protrusions 23a in the above-described first embodiment did not bend or deform when lamp 10 was inserted, protrusions 23aD in the present embodiment deform in a direction perpendicular to the central axis of fixture body 21.

[0097] Specifically, each of the plurality of protrusions 23aD is a bent plate-like member. For example, each of the plurality of protrusions 23aD is a leaf spring made of a metal plate, and one end is fixed to the inner surface of the frame body 21a so that the main surface is parallel to the central axis of the device main body 21. As an example, each of the protrusions 23aD has a shape in which a thin rectangular metal plate is wound in the longitudinal direction, and has one side (first side) fixed to the inner peripheral surface of the frame body 21a and the other side (second side) which is a free end located on the opposite side from the inner peripheral surface of the frame body 21a. In this embodiment, three protrusions 23aD are fixed to the frame body 21a at 120-degree intervals along the axial direction of the central axis of the device main body 21.

[0098] When the lamp 10 is attached to the fixture body 21, the lamp 10 is rotated inside the fixture body 21, causing the bent protrusions 23aD to deform and stretch in the direction of rotation of the lamp 10. Specifically, the other side of the free end of the wrapped metal plate is pressed by the lamp 10, causing it to deform and stretch in the direction of rotation. As a result, the tips of the free ends of the protrusions 23aD come into contact with the side of the lamp 10. In this case, the protrusions 23aD are elastically deformed, and therefore, when the lamp 10 is removed from the socket 22, the protrusions 23aD return to their original state due to their elastic restoring force. Therefore, the lamp 10 can be replaced many times.

[0099] As described above, the lighting fixture 1D of this embodiment, like the first embodiment, includes a mounting fixture 20D to which the lamp 10 is detachably attached, and the mounting fixture 20D has a fixture body 21, a socket 22, and a heat dissipation mechanism 23D provided on the inner surface of the fixture body 21, and the heat dissipation mechanism 23D is in contact with the lamp 10.

[0100] This configuration allows the heat generated by the lamp 10 to be efficiently dissipated without compromising ease of lamp replacement.

[0101] Furthermore, in lighting device 1D of the present embodiment, protrusion 23 aD constituting heat dissipation mechanism 23D deforms in a direction perpendicular to the central axis of device body 21 .

[0102] This configuration allows the protrusion 23aD to be elastically deformed in a direction perpendicular to the central axis of the instrument body 21 (radial direction).

[0103] Furthermore, in lighting fixture 1D of the present embodiment, multiple protrusions 23aD are provided along the circumferential direction of the inner surface of fixture body 21. Each of multiple protrusions 23aD is a folded plate-like member, and by rotating lamp 10 when installing lamp 10 in fixture body 21, multiple folded protrusions 23aD deform so as to extend in the rotational direction of lamp 10.

[0104] With this configuration, the rotation of the lamp 10 when it is attached to the mounting fixture 20D can be used to elastically deform the plurality of protrusions 23aD, allowing the lamp 10 to come into contact with the plurality of protrusions 23aD.

[0105] (Modifications) Although the lighting fixture according to the present disclosure has been described above based on the embodiment, the present disclosure is not limited to the above embodiment.

[0106] For example, in the above-described first to third embodiments, the protrusions 23a to 23aD are made of a metal material, but this is not limiting. The protrusions 23a to 23aD may be made of a non-metallic material such as a resin material, as long as the material has high thermal conductivity. In this case, the protrusions 23a to 23aD should be made of an elastically deformable material such as an elastomer. Furthermore, the thermal conductivity of the protrusions 23a to 23aD should be higher than the thermal conductivity of the housing 11 of the lamp 10 so that heat from the lamp 10 is efficiently conducted to the protrusions 23a to 23aD.

[0107] Furthermore, in the first to third embodiments, the lamp 10 is an LED lamp having an LED light source, but this is not limiting. For example, the lamp 10 may be a fluorescent lamp, a halogen lamp, or the like.

[0108] Furthermore, in the above-described first to third embodiments, the lamp 10 is a flat-type lamp having a GX53-type base, but this is not limiting. For example, the lamp 10 may be a lamp having a GH76p-type or GH69h-type base, or may be a lamp other than a flat-type lamp. Furthermore, the lamp 10 may be a bulb-type lamp having an E-type base (E-base). In this case, the socket 22 of the mounting fixture 20 has a threaded portion into which the E-base is fitted.

[0109] In addition, the present disclosure also includes forms obtained by applying various modifications that a person skilled in the art would conceive of to the above-described embodiments and modifications, and forms realized by arbitrarily combining the components and functions of the embodiments and modifications within the scope of the present disclosure. The present disclosure also includes any combination of two or more claims from the multiple claims set forth in the claims at the time of filing, provided that there is no technical contradiction. For example, when a dependent claim set forth in the claims at the time of filing is made into a multiple claim or multiple multiple claims that cite all of the superordinate claims within the scope of the technical contradiction, the present disclosure also includes any combination of all claims included in that multiple claim or multiple multiple claims.

[0110] The technology disclosed herein can be widely used in lighting fixtures such as downlights that have a mounting fixture to which a lamp is attached, and is particularly useful as a recessed lighting fixture that is installed by being embedded in a building material such as a ceiling.

[0111] REFERENCE SIGNS LIST 1, 1B, 1D Lighting fixture 10 Lamp 11 Housing 12 Light-emitting section 13 Light-transmitting cover 14 Power supply pin 15 Power supply section 16 Protrusion 20, 20B, 20D Mounting fixture 21 Fixture body 21a Frame 21b Top plate 22 Socket 22a Pin receiving hole 22b Recess 23, 23A, 23B, 23C, 23D Heat dissipation mechanism 23a, 23aA, 23aB, 23aC, 23aD Protrusion 100 Ceiling 101 Through hole

Claims

1. A lighting fixture comprising a fixture to which a lamp is attached and which is recessed into a ceiling, the fixture having a fixture body and a heat dissipation mechanism provided on the inner surface of the fixture body, the heat dissipation mechanism being in contact with the lamp.

2. The lighting fixture according to claim 1, wherein the heat dissipation mechanism is at least one protrusion, and the at least one protrusion has a tip that contacts a side surface of the lamp.

3. The lighting fixture according to claim 2, wherein the at least one protrusion protrudes inward from the inner surface of the fixture body.

4. The lighting device according to claim 3, wherein the at least one protrusion is elastically deformable.

5. The lighting fixture according to claim 4, wherein the lamp is configured to be inserted into the fixture body in a first direction when attached to the fixture body, and the at least one protrusion is deformable in the first direction.

6. The lighting fixture according to claim 5, wherein the at least one protrusion comprises a plurality of protrusions, and the plurality of protrusions are arranged along the axial direction of the central axis of the fixture body.

7. The lighting fixture according to claim 3, wherein the at least one protrusion deforms in a direction perpendicular to the central axis of the fixture body.

8. The lighting fixture described in claim 7, wherein the at least one protrusion consists of a plurality of protrusions, the plurality of protrusions are arranged along the circumferential direction of the inner surface of the fixture body, and each of the plurality of protrusions is a folded plate-like member, and by rotating the lamp when attaching the lamp to the fixture body, the folded plurality of protrusions are deformed so as to extend in the rotational direction of the lamp.

9. A lighting fixture according to any one of claims 1 to 8, wherein the lamp has a base, and the mounting fixture has a socket to which the base of the lamp is detachably attached.

10. A lighting fixture according to any one of claims 1 to 8, wherein the lamp has an LED light source.

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