Luminaire

Abstract

To provide a luminaire that can restrain melting of a lens.SOLUTION: A luminaire comprises: a light source part comprising a board in which a light emitting element is mounted on a surface on the side of a first direction that is an irradiation direction; a lens arranged on a surface of the light source part on the side of the first direction, and in which a plurality of convex parts protruding in the first direction are formed; a reflector arranged on the lens on the side of the first direction, and holding the lens; and a lens cover sandwiched between the reflector and the lens, and with which the plurality of convex parts of the lens are in contact.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to lighting fixtures, and more particularly to lighting fixtures having lenses. [Background technology]

[0002] 2. Description of the Related Art As an illumination device, for example, as described in Patent Document 1, a configuration having a lens and a diffusion plate provided on the irradiation opening side of the lens is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-72003 A Summary of the Invention [Problem to be solved by the invention]

[0004] The diffuser in Patent Document 1 is provided in contact with the light exit surface of the lens, so it can protect the lens from adhesion of foreign matter, but if foreign matter adheres to the diffuser, the light is concentrated on the foreign matter, causing the temperature of the diffuser to rise. If the heat from the diffuser is transmitted to the lens, the temperature of the lens will rise locally, causing the lens to melt.

[0005] An object of the present disclosure is to provide a lighting fixture that can suppress melting of the lens. [Means for solving the problem]

[0006] The lighting device of the present disclosure includes a light source unit having a substrate on which a light-emitting element is mounted on a surface facing a first direction, which is an irradiation direction; a lens arranged on the surface facing the first direction of the light source unit and having a plurality of convex portions formed thereon protruding in the first direction; a reflector arranged on the first direction side of the lens and holding the lens; and a lens cover sandwiched between the reflector and the lens and against which the plurality of convex portions of the lens abut. Effect of the Invention

[0007] In the lighting fixture according to the present disclosure, the lens cover is sandwiched between the lens and the reflector in a state separated from the lens by the convex portion formed on the lens. Therefore, even if the temperature of the lens cover rises due to a foreign object attached to the lens cover, the heat is not transferred to the lens, and the lens is prevented from melting. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is an exploded perspective view of the lighting fixture according to the first embodiment. [Diagram 2] FIG. 2 is a bottom view of the lighting fixture according to the first embodiment. [Diagram 3] 1 is a perspective view of a lighting fixture according to a first embodiment. [Figure 4] 3 is a side view of the lighting fixture according to the first embodiment, seen from above in FIG. 2. [Diagram 5] 3 is a side view of the lighting fixture according to the first embodiment, seen from the right side in FIG. 2. [Figure 6] 2 is a plan view of a reflector of the lighting device according to the first embodiment, viewed from a first direction. FIG. [Figure 7] 7 is a side view of the reflector of the lighting fixture according to the first embodiment, as viewed from above in FIG. 6. [Figure 8] 7 is a side view of the reflector of the lighting fixture according to the first embodiment, as viewed from below in FIG. 6. [Figure 9] 7 is a side view of the reflector of the lighting fixture according to the first embodiment, viewed from the right in FIG. 6. [Figure 10] 2 is a cross-sectional view of a reflector of the lighting fixture according to the first embodiment. FIG. [Figure 11] 3 is a partial cross-sectional view of a reflector of the lighting fixture according to the first embodiment. FIG. [Figure 12] FIG. 2 is an exploded perspective view of a reflector assembly of the lighting fixture according to the first embodiment. [Figure 13]FIG. 2 is a schematic diagram illustrating a state in which the reflector assembly of the lighting fixture according to the first embodiment is assembled. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of a lighting device according to the present disclosure will be described with reference to the drawings. Note that the present disclosure is not limited to the embodiment described below. In addition, the size relationship of each component in the following drawings, including FIG. 1, may differ from the actual one. In addition, in the following description, terms indicating directions are used as appropriate to facilitate understanding, but these terms are for the purpose of explanation and do not limit the present disclosure. Examples of terms indicating directions include "up", "down", "right", "left", "front" and "rear".

[0010] Embodiment 1 <Lighting fixture configuration> Fig. 1 is an exploded perspective view of lighting fixture 100 according to embodiment 1. Fig. 2 is a bottom view of lighting fixture 100 according to embodiment 1. Fig. 3 is a perspective view of lighting fixture 100 according to embodiment 1. Fig. 4 is a side view of lighting fixture 100 according to embodiment 1, as viewed from above in Fig. 2. Fig. 5 is a side view of lighting fixture 100 according to embodiment 1, as viewed from the right side in Fig. 2.

[0011] 1 to 5, the lighting device 100 includes a light source unit 1, a heat sink 3, a reflector assembly 4, and a reflector frame 5. The lighting device 100 irradiates light toward the inside of a room or the like.

[0012] The lighting fixture 100 is, for example, a recessed universal downlight that is installed by being recessed into a recessed hole (not shown) formed in a mounting portion such as a ceiling (not shown). The recessed hole is, for example, a circular hole with a diameter of 75 mm to 85 mm. The recessed hole may be rectangular, in which case the diagonal length of the recessed hole is, for example, 75 mm to 85 mm. The recessed hole is, for example, formed by hollowing out an opening edge (not shown) in the upward direction.

[0013] The light source unit 1 emits light. The light source unit 1 is supplied with power that is externally supplied and converted by a power supply device 8. The light source unit 1 has a light emitting substrate 1a, a socket 1b, and an insulating sheet 1c. The light emitting substrate 1a is a substrate on which a light emitting element is mounted. The light emitting element is mounted on the lower surface of the light emitting substrate 1a, on the surface on the first direction Z1 side. The light emitting element is, for example, a COB (Chip On Board)-LED. The socket 1b has an opening in the center and holds the light emitting substrate 1a fitted into the central opening.

[0014] The light emitted from the light-emitting element passes through the opening of the socket 1b and is irradiated in the first direction Z1, which is the irradiation direction. An electric wire (not shown) connected to a power supply unit 8 is connected to the socket 1b. The light-emitting substrate 1a and the power supply unit 8 are electrically connected via the electric wire. For example, a circular light-shielding sheet is sandwiched and disposed between the lower surface of the socket 1b and the upper edge of the lens 2. The light-shielding sheet is provided to prevent the light emitted from the light-emitting element from leaking to the surroundings when the light enters the lens 2. A flat insulating sheet 1c is provided between the light-emitting substrate 1a and the heat sink 3 to insulate the light-emitting substrate 1a from the heat sink 3.

[0015] The heat sink 3 dissipates heat transferred from the light source unit 1 into the air through the fins 32. The heat sink 3 is formed by forcing a metal with high thermal conductivity, such as an aluminum alloy, into a casting die. The heat sink 3 has a disk-shaped base unit 30 and a plurality of fins 32 that rise from the upper surface of the base unit 30 on the second direction Z2 side.

[0016] The light source unit 1 is attached to the base unit 30. The light source unit 1 is fixed to the lower surface of the base unit 30 via an insulating sheet 1c. The fins 32 are provided to dissipate heat generated from the light source unit 1. The fins 32 are, for example, in the form of a plate having a surface that is approximately perpendicular to the upper surface of the base unit 30.

[0017] The power supply device 8 changes the power supplied from the outside via a terminal block 8a and supplies the power to the light emitting substrate 1a of the light source unit 1. The terminal block 8a has a terminal to which an electric wire (not shown) connected to a commercial power source is connected and to which power is supplied from the commercial power source. The power supply device 8 is fixed to a base portion 30 of the heat sink 3. The power supply device 8 has a shape that extends in a direction intersecting with the Z direction, which is the up-down direction, for example. The power supply device 8 has a configuration in which a power supply substrate is covered and protected by a cylindrical housing 8b, for example. The housing 8b is made of resin, for example.

[0018] The reflector assembly 4 is composed of a lens 2, a lens cover 6, and a reflector 7.

[0019] The lens 2 is disposed on the first direction Z1 side of the light source unit 1. The lens 2 covers the first direction Z1 side of the light source unit 1. The lens 2 controls the light distribution so that the light emitted from the light-emitting element is irradiated in a target direction. The lens 2 is configured, for example, in a truncated cone shape expanding toward the first direction Z1, which is the irradiation side. An incident recess (not shown) is formed on the upper surface, which is the surface on the second direction Z2 side of the lens 2, to allow the light emitted from the light-emitting element to enter inside.

[0020] A plurality of convex portions 21 protruding in the first direction Z1 are provided on the lower surface, which is the irradiation side of the lens 2, on the first direction Z1 side. The convex portions 21 are arranged on the outer circumferential edge of the lens 2, for example, four at equal intervals.

[0021] The lens cover 6 is disposed on the first direction Z1 side of the lens 2, directly below the lens 2. The lens cover 6 is provided to protect the lens 2. The lens cover 6 is disk-shaped and has a size that allows it to fit into the reflector 7. The provision of the lens cover 6 makes it possible to prevent the surface of the lens 2 from becoming dirty. Furthermore, the lens cover 6 can be easily cleaned if it becomes dirty.

[0022] The lens cover 6 is formed of a material having heat resistance or chemical resistance, for example, glass. This prevents the lens 2 from becoming cloudy due to chemicals, which may occur when the lens 2 is cleaned, and thus prevents the light emitted from the lens 2 from being affected. In addition, since the lens cover 6 is made of glass, which has high heat resistance and chemical resistance, it is less susceptible to the effects of chemicals used for cleaning. The lens cover 6 can be made of borosilicate glass, for example.

[0023] The reflector 7 is disposed on the first direction Z1 side of the lens 2. The lens 2 and the lens cover 6 are housed in the reflector 7. The reflector 7 has a function of holding the lens 2. The reflector 7 also controls the light distribution so that the light emitted from the light-emitting element is irradiated in a target direction. The reflector 7 also serves to attach the reflector frame 5.

[0024] The reflector frame 5 is disposed on the first direction Z1 side of the reflector assembly 4. The reflector frame 5 holds the reflector assembly 4 from the first direction Z1 side. The reflector frame 5 has a cone shape that widens toward the first direction Z1 side.

[0025] The reflector frame 5 is provided with a mounting spring 9. The mounting spring 9 is made of an elastic material such as stainless steel, and is a leaf spring formed by bending a strip-shaped plate material. When the lighting fixture 100 is viewed from the side, the mounting spring 9 has a bow-shaped curved shape that is convex upward. For example, three mounting springs 9 are provided at intervals around the circumferential direction of the reflector frame 5.

[0026] After being elastically deformed towards the heat sink 3, the mounting spring 9 is inserted into an embedding hole formed in a ceiling or the like together with the heat sink 3, the light source unit 1, and the reflector assembly 4. When the elastic deformation of the mounting spring 9 is released, a warping force toward the ceiling or the like, that is, a restoring force, generates three-point forces that pull the heat sink 3, the light source unit 1, and the reflector assembly 4 upward as a reaction to the warping force of the mounting spring 9. The warping force of the mounting spring 9 causes the reflector frame 5 to abut against the ceiling or the like, and the lighting fixture 100 is fixed.

[0027] <Reflector 7 Configuration> Fig. 6 is a plan view of the reflector 7 of the lighting fixture 100 according to the first embodiment as viewed from the first direction Z1. Fig. 7 is a side view of the reflector 7 of the lighting fixture 100 according to the first embodiment as viewed from the top of Fig. 6. Fig. 8 is a side view of the reflector 7 of the lighting fixture 100 according to the first embodiment as viewed from the bottom of Fig. 6. Fig. 9 is a side view of the reflector 7 of the lighting fixture 100 according to the first embodiment as viewed from the right of Fig. 6. Fig. 10 is a cross-sectional view of the reflector 7 of the lighting fixture 100 according to the first embodiment, taken along line AA in Fig. 6. Fig. 11 is a partial cross-sectional view of the reflector 7 of the lighting fixture 100 according to the first embodiment, showing part B in Fig. 10.

[0028] 6 to 11, the reflector 7 has a body portion 71b and a cylindrical tubular portion 71a located on the first direction Z1 side of the body portion 71b. The body portion 71b is a portion that is attached to the light source unit 1 and that houses the lens 2. The tubular portion 71a is a portion that houses the lens cover 6.

[0029] The inner diameter of the tube portion 71a is smaller than the outer diameter of the lens cover 6, and is an inner diameter into which the lens cover 6 fits. An edge portion 72 extending inward of the tube portion 71a is formed at the end of the tube portion 71a on the first direction Z1 side. The inner diameter of the edge portion 72 is smaller than the outer diameter of the lens cover 6. The edge portion 72 supports the lens cover 6 from the first direction Z1 side.

[0030] The cylindrical portion 71a is provided with a fitting portion 711 and a locking portion 712. The fitting portion 711 and the locking portion 712 are disposed at positions facing each other on the circumference of the cylindrical portion 71a.

[0031] The fitting portion 711 is a portion into which a part of the periphery of the lens 2 is inserted and hooked. The fitting portion 711 is formed, for example, in a shape that protrudes in an arc shape from the inner surface of the cylindrical portion 71a when viewed in the axial direction of the cylindrical portion 71a.

[0032] The locking portion 712 is a portion to which another part of the periphery of the lens 2 is locked. The locking portion 712 is configured with a flexible snap-fit ​​structure. The locking portion 712 has an extension portion 712a, a bent portion 712b continuing from the extension portion 712a, and an engagement claw 712c continuing from the bent portion 712b.

[0033] The extending portion 712a extends in the radial direction of the tube portion 71a from a base end located in a portion recessed from the inner surface of the tube portion 71a toward the outer surface side. The bending portion 712b is a portion that is bent in the axial direction of the tube portion 71a at the distal end of the extending portion 712a and extends along the inner surface of the tube portion 71a.

[0034] The engagement claw 712c is provided at the tip of the bent portion 712b. Another part of the periphery of the lens 2 is engaged with the engagement claw 712c. The engagement claw 712c is shaped to protrude in the first direction Z1 and away from the tube portion 71a. The engagement claw 712c has an inclined surface portion 712d that protrudes in the first direction Z1 and away from the inner surface of the tube portion 71a.

[0035] With the lens 2 attached to the reflector 7, the surface of the fitting portion 711 on the first direction Z1 side is in contact with the surface of the lens 2 on the second direction Z2 side. The extension portion 712a of the locking portion 712 extends along the diameter direction of the lens 2, and the bent portion 712b of the locking portion 712 is along the periphery of the lens 2. The engagement claw 712c of the locking portion 712 is in contact with the surface of the lens 2 on the second direction Z2 side.

[0036] By attaching the lens 2 to the fitting portion 711 of the reflector 7 and the engagement claw 712c of the locking portion 712, the reflector 7 and the lens 2 are integrated, and movement of the lens 2 relative to the reflector 7 in the second direction Z2 is restricted.

[0037] <Reflector assembly 4> Fig. 12 is an exploded perspective view of the reflector assembly 4 of the lighting device 100 according to embodiment 1. Fig. 13 is a schematic diagram illustrating the assembled state of the reflector assembly 4 of the lighting device 100 according to embodiment 1, in which the reflector assembly 4 is cut along a plane extending in the Z direction along line CC in Fig. 12.

[0038] 12 and 13, the reflector assembly 4 is configured by attaching the lens cover 6 and the lens 2 in this order from the second direction Z2 side of the reflector 7. The reflector assembly 4 is assembled in the following procedure.

[0039] First, the lens cover 6 is inserted into the cylindrical portion 71a of the reflector from the body portion 71b on the second direction Z2 side of the reflector and is held by the edge portion 72 of the reflector.

[0040] Next, the lens 2 is disposed on the second direction Z2 side of the reflector 7, and is inserted from the body portion 71b of the reflector 7 into the tube portion 71a of the reflector 7 so that the convex portion 21 of the lens 2 presses the lens cover 6.

[0041] Next, a part of the periphery of the lens 2 is hooked onto the fitting portion 711 of the tube portion 71a of the reflector 7. For example, the part of the periphery of the lens 2 is inserted into the space between the shape protruding from the inner surface of the tube portion 71a constituting the fitting portion 711 and the edge portion 72 extending from the tube portion 71a, and hooked onto the fitting portion 711.

[0042] Next, the other part of the periphery of the lens 2, which faces the part of the periphery of the lens 2 hooked on the fitting portion 711, is locked by the locking portion 712 of the tube portion 71a of the reflector 7. The other part of the periphery of the lens 2 is pressed down against the engagement claw 712c of the locking portion 712. When the lens 2 is pressed down against the engagement claw 712c, the lens 2 moves along the inclined surface portion 712d of the engagement claw 712c, which causes the engagement portion 712 to bend and the engagement claw 712c to move back in the outer diameter direction of the tube portion 71a. When the lens 2 is further pressed down and moves to the end of the inclined surface portion 712d, the engagement claw 712c pops out toward the second direction Z2 side of the lens 2 due to the restoring force of the locking portion 712. The lens 2 is locked in a state in which the movement in the second direction Z2 is restricted by the engagement claw 712c that has popped out toward the second direction Z2 side.

[0043] This completes the assembly of the reflector assembly 4 in which the lens 2 is fixed to the reflector 7 with the lens cover 6 interposed therebetween.

[0044] In the reflector assembly 4, the lens cover 6 is attached inside the reflector 7 constituting the reflector assembly 4, and is sandwiched between the reflector 7 and the lens 2. The reflector 7 has a function of holding the lens 2 and maintaining a function of reflecting light, while also holding the lens cover 6. The provision of the lens cover 6 protects the lens 2 and prevents the surface of the lens 2 from becoming dirty. In addition, there is no need to change the structure of the reflector frame 5 to which the reflector assembly 4 is attached, and any existing reflector frame 5 can be combined, so an increase in the number of parts can be prevented.

[0045] The lens cover 6 is pressed by the convex portion 21 of the lens 2, and is held at a distance from the lens 2 by the dimension of the convex portion 21. Therefore, if a foreign object adheres to the lens cover 6 and light concentrates on the foreign object, causing a rise in temperature, the heat is prevented from being transferred to the lens 2, preventing the lens 2 from melting. The height dimension of the convex portion 21 may be any dimension that prevents the lens 2 from melting. However, the larger the height dimension of the convex portion 21, the larger the size of the reflector 7 or the lighting device 100.

[0046] The convex portions 21 of the lens 2 are disposed along the inner circumference of the tube portion 71a, and their tips abut against and press against the lens cover 6. This allows the lens cover 6 to be stably held within the reflector 7. The number and spacing of the convex portions 21 of the lens 2 are not limited to four and equal spacing, and may be any number and spacing that allows the lens cover 6 to be stably held by the reflector 7.

[0047] The lens cover 6 is pressed by the convex portion 21 of the lens 2, and is sandwiched between the lens cover 6 and the reflector 7 and fixed to the reflector 7. Therefore, there is no need to prepare a separate part for fixing the lens cover 6, and the number of parts does not increase. In addition, the lens cover 6 is held in a state separated from the lens 2 by the convex portion 21 provided on the lens 2, so the structure for holding the lens cover 6 is simple, and an increase in the number of parts can be suppressed.

[0048] In the lighting device 100 according to the first embodiment described above, the lens cover 6 is sandwiched between the reflector 7 and the lens 2, so that the lens 2 is protected and dirt on the surface of the lens 2 can be prevented. Moreover, the lens cover 6 can be held without changing the structure of the reflector frame 5, and can be combined with any existing reflector frame 5, so that an increase in the number of parts can be prevented.

[0049] Furthermore, since the lens 2 is formed with a convex portion 21 that protrudes in the first direction Z1, the lens cover 6 can be sandwiched between the lens 2 and the reflector 7 in a state in which the lens cover 6 is separated from the lens 2. Therefore, even if the temperature of the lens cover 6 rises due to foreign matter adhering to the lens cover 6, the heat is not transferred to the lens 2, and it is possible to prevent the lens 2 from melting. Furthermore, since the convex portion 21 of the lens 2 can maintain the separated state, the structure is simple and an increase in the number of parts can be suppressed.

[0050] Furthermore, since the convex portion 21 of the lens 2 is formed along the inner diameter side of the cylindrical portion 71a of the reflector 7, the convex portion 21 of the lens 2 can press the lens cover 6 stably.

[0051] Furthermore, since the lens cover 6 is supported by the edge 72 of the reflector 7 and held by the lens 2, it can be combined with any existing reflector frame 5 without changing the structure of the reflector frame 5.

[0052] Furthermore, the lens cover 6 is sandwiched and held inside the reflector 7 by the lens 2 locked by the fitting portion 711 and the locking portion 712 of the reflector 7. This simplifies the structure of the mechanism for holding the lens cover 6, suppresses an increase in the number of parts, and makes it easy to attach the lens cover 6 to the lens 2. [Explanation of symbols]

[0053] 1 light source portion, 1a light emitting board, 1b socket, 1c insulating sheet, 2 lens, 3 heat sink, 4 reflector assembly, 5 reflector frame, 6 lens cover, 7 reflector, 8 power supply unit, 8a terminal block, 8b housing, 9 mounting spring, 21 convex portion, 30 base portion, 32 fin, 71a tube portion, 71b body portion, 72 edge portion, 100 lighting fixture, 711 fitting portion, 712 locking portion, 712a extension portion, 712b bent portion, 712c engagement claw, 712d inclined surface portion.

Claims

1. a light source unit having a substrate on which a light emitting element is mounted on a surface on a first direction side which is an irradiation direction; a lens disposed on a surface of the light source unit on the first direction side, the lens having a plurality of convex portions formed thereon and protruding in the first direction; a reflector that is disposed on a side of the lens in the first direction and that holds the lens; a lens cover that is sandwiched between the reflector and the lens and against which the plurality of convex portions of the lens abut; Lighting fixtures equipped with.

2. The plurality of protrusions are The reflector is formed so as to fit the inner surface of the reflector.

2. A lighting fixture according to claim 1.

3. The reflector is a cylindrical portion having a cylindrical shape and housing the lens cover and the lens; an edge portion extending inward from an end portion of the cylindrical portion on the first direction side; Equipped with The lens cover is held between the edge and the lens.

3. A lighting device according to claim 1 or 2.

4. a fitting portion provided on the cylindrical portion and into which the lens is fitted; a locking portion provided on the cylindrical portion opposite the fitting portion, the locking portion having flexibility and adapted to lock the lens; having The lens cover is The lens is fitted into the fitting portion of the cylindrical portion and is pressed by the lens that is locked to the locking portion of the cylindrical portion.

4. A lighting device according to claim 3.

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