Lighting device

Abstract

The invention provides lighting equipment that is compatible with thermal insulation construction and ensures heat dissipation. [Solution] The lighting device 10 comprises a base portion 21 to which a light source portion 17 is attached on the front side, a fin portion 22 provided on the rear side of the base portion 21, and a breathable cover portion 18 that covers the fin portion 22. The cover portion 18 is provided with a plurality of ventilation holes 47. The cover portion 18 covers the rear and side sides of the fin portion 22, and the front side facing the base portion 21 is open to form a ventilation portion 50 between the cover portion 18 and the base portion 21.

Description

Technical Field

[0001] Embodiments of the present invention relate to lighting devices.

Background Art

[0002] Conventionally, there is a lighting device such as a downlight that is embedded and installed in an embedding hole opened in a ceiling surface. In this lighting device, it has a structure in which heat generated by a light source unit arranged on the front side is radiated from a fin unit provided on the back side.

[0003] Also, when high thermal resistance heat insulation construction is carried out by covering with a heat insulating material such as glass wool or cellulose fiber shredded on the ceiling surface, if the fin part of the lighting device is covered with the heat insulating material, sufficient heat dissipation by the fin part may not be ensured.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The problem to be solved by the present invention is to provide a lighting device that can cope with heat insulation construction and ensure heat dissipation.

Means for Solving the Problems

[0006] The lighting device of the embodiment includes a base part to which a light source unit is attached on the front side, a fin part provided on the back side of the base part, and a breathable cover part that covers the fin part.

Effects of the Invention

[0007] According to the embodiment, it can be expected to cope with heat insulation construction and ensure heat dissipation.

Brief Description of the Drawings

[0008] [Figure 1] This is a perspective view of a lighting device showing one embodiment. [Figure 2] This is a disassembled perspective view of the light fixture of the same lighting device. [Figure 3] This is a cross-sectional view of the same lighting device. [Modes for carrying out the invention]

[0009] One embodiment will be described below with reference to the drawings.

[0010] As shown in Figures 1 to 3, the lighting device 10 is a downlight that is embedded and installed in a recessed hole provided in a ceiling member such as a ceiling panel.

[0011] The lighting device 10 comprises a lamp body 11, a power supply unit 12 that supplies power to the lamp body 11, and wiring 13 that electrically connects the lamp body 11 and the power supply unit 12.

[0012] The light fixture 11 comprises a fixture body 16, a light source unit 17 disposed on the front side (bottom side) of the fixture body 16, a cover unit 18 that covers the upper side of the fixture body 16, and a plurality of mounting springs 19 attached to the outer surface of the fixture body 16.

[0013] The main body of the appliance 16 is made of a metal material with excellent thermal conductivity and heat dissipation, such as die-cast aluminum, and is integrally formed from it. The main body of the appliance 16 has a base portion 21 and a fin portion 22 provided on the back side (top side) of the base portion 21.

[0014] The base portion 21 includes a light source mounting portion 24 on which the light source portion 17 is installed, a conical cylindrical portion 25 that opens downward from the periphery of the light source mounting portion 24, and an annular decorative frame portion 26 that protrudes outward from the lower end of the cylindrical portion 25, with the inner lower surface of the decorative frame portion 26 being open. An annular packing 26a, for example made of silicone, is placed on the decorative frame 26 to contact the lower surface of the ceiling member.

[0015] In the light source arrangement part 24 of the base part 21, a flat back part (upper surface part) 27 and side surface parts 28 protruding downward from the peripheral part of this back part 27 are formed. The lower surface side of the back part 27 is formed as a planar light source mounting surface for mounting the light source part 17. Also, the inner surface side of the cylindrical part 25 is formed as a reflecting surface for reflecting the light from the light source part 17 downward. Further, the decorative frame part 26 abuts against the lower surface of the ceiling member around the embedding hole when installing the fixture on the ceiling member, sandwiches the ceiling member between itself and the mounting spring 19, and covers the embedding hole.

[0016] A plurality of spring mounting parts 29 for mounting the mounting spring 19 are provided at the peripheral part of the base part 21, at the lower part on the outer surface side of the cylindrical part 25.

[0017] The fin part 22 has a plurality of outer peripheral side fin parts 31 located at the outer periphery on the back side of the base part 21, and a plurality of central side fin parts 32 located on the central side surrounded by the outer peripheral side fin parts 31. The outer peripheral side fin parts 31 and the central side fin parts 32 are thermally connected.

[0018] The outer peripheral side fin parts 31 are plate-shaped rising from the base part 21, and are respectively positioned along the radial direction from the center (central axis of the base part 21) in the rear view of the base part 21. The outer peripheral side fin parts 31 rise from the peripheral area of the back part 27 of the light source arrangement part 24 to the intermediate area in the vertical direction of the cylindrical part 25, and are thermally connected across the back part 27, the side surface parts 28, and the cylindrical part 25.

[0019] The central side fin parts 32 are plate-shaped rising from the base part 21, and have a plurality of annular parts 33 positioned concentrically from the center (central axis of the base part 21) in the rear view of the base part 21, and a plurality of radial parts 34 positioned along the radial direction from the center to the outermost annular part 33 in the rear view of the base part 21. Each radial part 34 is provided radially continuously with a part of the outer peripheral side fin parts 31.

[0020] The interval between adjacent fin portions 31 on the outer peripheral side (the widest interval at the outermost diameter portion) is smaller than the interval between fin portions 32 on the central side (the interval between adjacent annular portions 33, the widest interval between radial portions 34 adjacent between annular portions 33). The widest interval at the outermost diameter portion of the fin portions 31 on the outer peripheral side is, for example, 4 to 6 mm, preferably about 5 mm.

[0021] On the back side of the fin portion 22, mounting holes 35 for attaching the cover portion 18 are provided. The mounting holes 35 are formed by a cylindrical boss 36 provided in a region where the fin portion 31 on the outer peripheral side and the outermost annular portion 33 intersect. The boss 36 is raised from the back surface portion 27 of the base portion 21.

[0022] In a part of the fin portion 31 on the outer peripheral side and the fin portion 32 on the central side, a wiring drawing-in portion 37 into which the wiring 13 is drawn is provided, and a wiring cover 38 is screwed on the upper side of the wiring drawing-in portion 37.

[0023] Further, the light source unit 17 has a light source module 40 which is a light source, and a lens 41 which controls the light from the light source module 40.

[0024] The light source module 40 is configured by mounting a plurality of surface-mounted light-emitting elements 43 such as LEDs, for example, on the front side of the substrate 42. Note that the light source module 40 may be a COB (Chip On Board) module in which a plurality of LEDs mounted on the substrate are sealed with a phosphor layer. The back side of the substrate 42 is attached in a state of being thermally connected to the light source arrangement portion 24 of the base portion 21 via a heat conduction member such as a heat conduction sheet. A wiring 13 drawn into the base portion 21 from the wiring drawing-in portion 37 is connected to the light source module 40, and lighting power is supplied from the light source unit 12 to light the light-emitting elements 43.

[0025] The lens 41 is detachably attached to the side surface portion 28 of the light source arrangement portion 24 of the base portion 21, is disposed opposite to the light source module 40, and controls the light from the light source module 40 irradiated to the outside to a predetermined light distribution.

[0026] Furthermore, the cover portion 18 has a disc-shaped rear cover portion 45 and a cylindrical side cover portion 46 that protrudes downward from the periphery of the rear cover portion 45, and its bottom side is open. The diameters of the rear cover portion 45 and the side cover portion 46 are set to be larger than the overall diameter of the fin portion 22.

[0027] Multiple ventilation holes 47 are provided in the rear cover portion 45 and the side cover portion 46, giving the cover portion 18 breathability. The ventilation holes 47 are circular holes with a diameter of, for example, about 2 mm, and are arranged in a straight line at equal intervals in the perpendicular vertical direction (first direction) and horizontal direction (second direction). The spacing between adjacent ventilation holes 47 in the vertical and horizontal directions is smaller than the diameter of the ventilation hole 47, and the opening ratio of the ventilation holes 47 in the area of ​​the cover portion 18 is 50% or more. Note that the ventilation holes 47 of the cover portion 18 are not limited to a circular shape, but may be provided in a mesh, grid, slit, or other shapes.

[0028] The side cover portion 46 is provided with a wiring insertion hole 48 through which the wiring 13, which is to be drawn into the wiring entry portion 37 of the base portion 21, is inserted.

[0029] The cover portion 18 is placed over the fin portion 22 from the rear side, covering the rear and side sides of the fin portion 22. The cover portion 18 is fixed to the fin portion 22 by screwing multiple screws 49 through the mounting holes 35, with the rear cover portion 45 positioned on the rear side of the fin portion 22. The cover portion 18, fixed to the fin portion 22, is thermally connected to the fin portion 22.

[0030] The central area of ​​the rear cover portion 45 of the cover portion 18 is in contact with the back of the fin portion 22, but the peripheral area of ​​the rear cover portion 45 is outside the fin portion 22, and the side cover portion 46 is spaced apart from the fin portion 22. The diameter of the side cover portion 46 is smaller than the inner diameter of the embedded hole in the ceiling member, larger than the outer diameter of the lower end of the cylindrical portion 25, and larger than the diameter of the imaginary circle that connects the outer surfaces of the multiple spring mounting portions 29 in the circumferential direction.

[0031] A ventilation opening 50 is formed between the cover portion 18 and the base portion 21 on the front side.

[0032] Furthermore, the mounting spring 19 is, for example, a leaf spring, with one end attached to the spring mounting portion 29 of the base portion 21 and the other end protruding so as to extend laterally from the base portion 21.

[0033] Furthermore, the power supply unit 12 is separately positioned on the upper surface of the ceiling member and is electrically connected to the light source module 40 of the light source unit 17 via wiring 13. The power supply unit 12 includes a power supply circuit board (not shown) on which power supply circuit components are mounted to form a power supply circuit, a power supply case 53 that houses the power supply circuit board, and a terminal block 54 for connecting external power lines. The power supply circuit converts the AC power supplied through the power lines into a predetermined DC power, which is lighting power, and supplies it to the light source module 40 of the light source unit 17 to light up the light-emitting element 43.

[0034] To install the lighting device 10, power lines are pulled downwards from the recessed holes in the ceiling member and connected to the terminal block 54 of the power supply unit 12, and the power supply unit 12 is inserted into the recessed holes from below and placed on the upper surface of the ceiling member.

[0035] Each mounting spring 19 is elastically deformed against the spring force so that it follows the side of the cover portion 18, and then inserted into the embedded hole of the ceiling member from below. By releasing the deformation of the mounting springs 19, each mounting spring 19 expands laterally to the base portion 21 by the spring force and engages with the upper surface of the ceiling member, and the fixture body 16 is pulled up, and the fixture is sandwiched between each mounting spring 19 and the decorative frame portion 26 that abuts the lower surface of the ceiling member, completing the installation.

[0036] Furthermore, when the lighting device 10 is turned on, the heat generated by the light-emitting element 43 of the light source unit 17 is transferred to the base unit 21, then from the base unit 21 to the fin unit 22 (the outer fin unit 31 and the central fin unit 32), and from the fin unit 22 the heat is dissipated into the air.

[0037] The heat generated by the light-emitting element 43 of the light source unit 17 is mainly transferred to the central area of ​​the back surface 27 of the base unit 21, and then spreads from the central area of ​​this back surface 27 to the peripheral area, and further to the side surface 28 and the cylindrical part 25.

[0038] As heat is transferred to the outer fin portion 31 and its temperature rises, the warmed air surrounding the outer fin portion 31 rises, and cooler air flows in between the outer fin portion 31 from the outside, creating convection where air rises between the outer fin portion 31. This air convection allows for efficient heat dissipation from the outer fin portion 31.

[0039] The heat transferred to the rear section 27 is also transferred to the central fin section 32, and heat is dissipated into the air from the central fin section 32. Although there is little air convection in the central fin section 32, some of the heat transferred to the central fin section 32 is transferred to the thermally connected outer fin section 31, and heat is dissipated into the air from the outer fin section 31.

[0040] The fin section 22 is covered by the cover section 18, but since the cover section 18 has ventilation holes 47, it can reduce the obstruction of heat dissipation by the fin section 22. In addition, since the cover section 18 is attached to the fin section 22 and heat is transferred from the fin section 22, heat is also dissipated from the cover section 18, improving heat dissipation performance.

[0041] Furthermore, since a ventilation section 50 is opened between the front side of the cover section 18 and the base section 21, outside air can easily flow into the fin section 22 through the ventilation section 50, improving heat dissipation.

[0042] Furthermore, when insulation is applied to ceiling components, the entire surface of the ceiling component is covered with insulation material. For high thermal resistance insulation applications, insulation materials such as defibrated cellulose fiber are used, and the insulation material is sprayed onto the ceiling component and piled up to a predetermined height.

[0043] The insulation material is also applied to the lighting fixture 10 installed on the ceiling member, so that the lighting fixture 10 is covered with the insulation material.

[0044] If the cover portion 18 were absent, fine insulating material, like cotton dust, would get trapped between adjacent fin portions 22, obstructing the airflow caused by convection between the fin portions 22, thus reducing heat dissipation.

[0045] In the lighting device 10 of this embodiment, the fin portion 22 is covered with a breathable cover portion 18, which prevents the heat insulating material from getting between the fin portion 22 and ensures heat dissipation by the fin portion 22.

[0046] The ventilation holes 47 in the cover portion 18 have a smaller pore diameter compared to insulating materials such as defibrated cellulose fiber, thus reducing the amount of insulating material that gets into the spaces between the fin portions 22.

[0047] According to JIS 5002, a standard set by the Japan Lighting Manufacturers Association, the thermal resistance value of downlights suitable for insulated installations is 6.6 m². 2 Although it is specified up to kW, the lighting device 10 of this embodiment has a limit of 10 m 2 It becomes possible to handle thermal resistance values ​​of approximately kW / W. Furthermore, the energy-saving standard ZEH (registered trademark) requires a thermal resistance value of 15m 2 The thermal resistance value is specified as kW / W, and this can be addressed by extending the fin section 22 radially and upward to increase its surface area.

[0048] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0049] 10 Lighting devices 17 Light source section 18. Cover section 21 Base section 22 Fin section 50 Ventilation section

Claims

1. A base part to which the light source is attached on the front side; The fin portion provided on the rear side of the base portion; A breathable cover portion that covers the fin portion; A lighting device characterized by having the following features.

2. The cover portion covers the back and side sides of the fin portion, and the front side facing the base portion is open to form a ventilation portion between it and the base portion. The lighting device according to feature 1.

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