TWI718386B - Lighting fixture - Google Patents

Abstract

A lighting fixture 10 according to one example of an embodiment of the invention comprises: a fixture body 11 having a protruding section 12 that protrudes away from a ceiling 100 and a ring-shaped flange section 13 formed around the circumference of the protruding section 12, a light emitting module 20 that is secured to the protruding section 12, and a cover 30 that is secured to the fixture body 11 so as to cover the light emitting module 20, wherein the angleθ created by the side wall 12B of the protruding section 12 and the flange section 13 is 90° ＜θ ≤ 130°.

Description

Lighting equipment

The invention relates to a lighting appliance.

Conventionally, there is known a lighting fixture that is connected to a wiring fixture such as a power outlet installed on the ceiling, and the fixture body is installed along the ceiling. The lighting fixtures are generally called cloud screen lights. For example, Patent Document 1 discloses a lighting fixture that includes a fixture body, a circuit board supported by the fixture body, a light-emitting element assembled on the circuit board, and a light-transmitting cover that covers the light-emitting element. The outer peripheral end exists at the position of the super circuit board. [Prior Patent Document] [Patent Document]

[Patent Document 1] JP 2017-112071 A

[The problem to be solved by the invention]

However, in lighting equipment, since the light-emitting module including the light-emitting element generates heat when the light is turned on, in order to suppress the temperature rise of the equipment, improving the heat dissipation of the equipment becomes an important issue. In addition, in the case of a lighting fixture arranged close to the ceiling, heat tends to accumulate between the ceiling and the fixture. There is still room for improvement in the heat dissipation of previous lighting fixtures. [Means to solve the problem]

The luminaire of one form of the present disclosure is a luminaire installed on a ceiling, and it is characterized by comprising: an luminaire body having an bulging part that bulges to the opposite side of the ceiling, and a surrounding area of the bulging part The ring-shaped flange portion is formed; the light-emitting module is fixed to the bulge; and the cover covers the light-emitting module and is fixed to the appliance body; the side wall of the bulge and the protrusion The angle θ formed by the edge is 90˚<θ≦130˚. [Effects of Invention]

If it is based on the lighting fixture of one aspect of the present disclosure, good heat dissipation can be obtained, and the temperature rise of the fixture can be suppressed.

Hereinafter, with reference to the drawings, an example of the embodiment of the lighting fixture of the present disclosure will be described in detail. In addition, the selective combination of the constituent elements of the plurality of embodiments described below is an assumption at the beginning. In the specification of this patent, when the description of "substantially ~" is described by taking roughly parallel as an example, it is intended to include a completely parallel state and a state considered to be substantially parallel.

In the following, the lighting fixture 10 as an example of the embodiment will be described as being mounted on a flat ceiling 100 along the horizontal direction, but the lighting fixture 10 may be mounted on a ceiling inclined to the horizontal direction and the vertical direction. The ceiling 100 on which the luminaire 10 is installed is generally a ceiling in a house such as a house, but it only needs to be a part above the dividing architectural space. For example, it may be a ceiling such as a front entrance porch or a balcony.

In the following, for the convenience of description, the surface of the appliance body and the circuit board constituting the light-emitting module facing the ceiling 100 side (vertically above) is referred to as the "upper", and the side opposite to the ceiling 100 (vertically below, cover The face on the 30 side) is regarded as the "lower side".

1 and 2 are exploded perspective views of the lighting fixture 10, and FIG. 3 is a cross-sectional view of the lighting fixture 10 (illustrations of the power socket 50, the adapter 51, and the cover 30 are omitted). As shown in the examples of FIGS. 1 to 3, the lighting fixture 10 includes a fixture body 11, a light emitting module 20 fixed to the fixture body 11, and a cover 30 covering the light emitting module 20 and fixed to the fixture body 11. And it is installed on the ceiling 100 (refer to FIG. 3). The appliance body 11 has: a bulging part 12 bulged on the side opposite to the ceiling 100; and a ring-shaped flange part 13 formed around the bulging part 12. The light-emitting module 20 is fixed to the bulging part 12 of the appliance body 11.

The lighting fixture 10 is installed with the fixture body 11 along the ceiling 100, and the fixture body 11 is arranged close to the ceiling 100. The upper and lower surfaces of the appliance body 11 are arranged to be substantially better than the ceiling 100. The lighting fixture 10 series is generally called a cloud screen light. The luminaire 10 is the same as the conventional luminaire, and generates heat due to the lighting of the light-emitting module 20, but because of its excellent heat dissipation, it has a feature that the temperature of the luminaire is difficult to rise. The details are described later. The angle θ between the side wall 12B of the bulging portion 12 of the appliance body 11 and the flange portion 13 is 90˚<θ≦130˚, thereby improving the heat dissipation of the appliance.

The lighting fixture 10 is installed in a power outlet 50 of a wiring fixture installed on the ceiling 100. In this embodiment, the appliance body 11 is mounted to the power outlet 50 via the adapter 51. The power socket 50 is installed on the surface of the ceiling 100 facing vertically downward (hereinafter referred to as the ceiling surface). Therefore, the bulge 12 is formed in the appliance body 11 in order to avoid interference with the power socket 50. The luminaire 10 has a bulge 12 formed on the luminaire body 11, and an adapter 51 is used, whereby it can be installed in various wiring appliances. In other words, the bulging portion 12 is formed in a size that can be installed in various wiring appliances.

The appliance body 11 has the bulging part 12 and the flange part 13 as described above. A through hole 15 is formed in the center of the appliance body 11 (the bulging part 12), and the adapter 51 is fixed by the through hole 15. The instrument body 11 has a substantially circular ring shape in plan view formed in the through hole 15 in the center portion, and the bulging portion 12 and the flange portion 13 also have a substantially circular ring shape in plan view. At the peripheral edge portion of the flange portion 13, a peripheral wall 13A extending vertically downward is formed. In addition, the through hole 15 may not exist in the main system of the appliance, or the plan view shape of the appliance body may be an ellipse, a rectangle, or the like.

The appliance body 11 may be made of resin, but from the viewpoint of heat dissipation, durability, etc., it is preferably made of metal. As the metal material constituting the appliance body 11, aluminum, iron, alloys of these metals, and the like can be exemplified. Among them, the appliance body 11 is preferably made of metal whose main component is iron. The metal with iron as the main component means the metal with the largest proportion of iron among the metal elements, such as iron or steel alloys.

The appliance body 11 is preferably manufactured by pressing a metal plate. As the metal plate, by using an iron plate or an iron alloy plate, good formability, heat dissipation, durability, etc. can be obtained. In addition, although iron is cheaper than aluminum, it has poor thermal conductivity. However, since the appliance body 11 has a shape with high heat dissipation that satisfies 90˚<θ≦130˚, using an iron plate or an iron alloy plate can also ensure sufficient heat dissipation.

In this embodiment, a cylindrical holder 40 is provided along the periphery of the through hole 15. The holder 40 is fixed to the bottom of the appliance body 11 by screws on the periphery of the through hole 15. In the cylinder of the holder 40, a groove is formed along the circumferential direction, and the claw of the adapter 51 is engaged with the groove. In addition, at the periphery of the through hole 15, the protective cover 41 is fixed so as to overlap the holder 40. The protective cover 41 is a cylindrical object longer than the holder 40 in the axial direction, and covers the inner peripheral part of the light-emitting module 20.

The lighting fixture 10 includes an elastic member 42 interposed between the fixture body 11 and the ceiling surface. The elastic member 42 is attached to the upper surface of the flange portion 13 facing the ceiling 100 side. The elastic member 42 is in contact with the ceiling surface in a state where the lighting fixture 10 is installed in the power socket 50, and is compressed to, for example, about half of its thickness. Since the elastic member 42 is pressed by the ceiling surface, rotation, shaking, etc. of the lighting fixture 10 are suppressed.

As the elastic member 42, elastically deformable rubber, elastomer, foam, etc. are used. The elastic member 42 is generally called a buffer member. The elastic member 42 is joined to the upper surface of the flange portion 13 using, for example, an adhesive or an adhesive tape. It is also possible to form an inscription on the flange portion 13 to indicate the installation position of the elastic member 42.

The elastic member 42 is a block-shaped member that is long in the circumferential direction of the flange portion 13 and has a substantially constant width and thickness, and is gently curved with the same curvature as the flange portion 13. The elastic member 42 is suitably arranged in plural at intervals in the circumferential direction of the flange portion 13. In the example shown in FIG. 2, three elastic members 42 having the same shape and size are arranged at substantially equal intervals, but the number, arrangement, etc. of the elastic members are not limited to this. In addition, the shape of the elastic member is not limited to the shape of the example shown in FIG. 2.

The elastic member 42 is arranged in the inner part of the flange portion 13 in a range that does not hang on the curved surface portion, and is preferably arranged inwardly than the center of the flange portion 13 in the width direction. The width of the elastic member 42 is narrower than the width of the flange portion 13, and the elastic member 42 is arranged from the center in the width direction of the flange portion 13 so as not to extend beyond the outside. In this case, the user cannot see the elastic member 42 and the appearance of the lighting fixture 10 becomes good. The arrangement where the elastic member 42 does not protrude from the center of the width direction of the flange portion 13 to the outside is achieved by expanding the flange portion 13 with 90˚<θ≦130˚, so that the diameter of the appliance body 11 will not change. Great realization.

In the appliance body 11, the light-emitting module 20 is fixed to the bulging part 12, and the cover 30 is fixed to the flange part 13. In addition, a clamp 40 and a protective cover 41 are fixed to the bulging part 12. The bulging part 12 has a base 12A for fixing the light-emitting module 20 and a side wall 12B extending to the side opposite to the ceiling 100. Most of the base portion 12A is formed to be substantially parallel to the flange portion 13 (except for the peripheral wall 13A), and the side wall 12B extends vertically below the peripheral wall 13A. The through hole 15 is formed in the central part of the base 12A, and the light-emitting module 20 is installed around the through hole 15.

In the appliance body 11, a step is formed between the base 12A and the flange 13 by the side wall 12B inclined to the ceiling surface. In addition, a recessed portion 16 is formed on the upper surface side of the bulging portion 12. The presence of the recessed portion 16 prevents the appliance body 11 from contacting the power socket 50 even if the flange portion 13 is arranged close to the ceiling surface. That is, by forming the recessed portion 16 (the bulging portion 12), the gap between the flange portion 13 and the ceiling surface can be reduced, and a beautiful installation form can be realized.

The light-emitting module 20 has a light-emitting element 21, a circuit board 22, and an element 23 for a power circuit. In this embodiment, the light-emitting element 21 and the power circuit element 23 are assembled on a single circuit board 22, the light-emitting element 21 is arranged on the outside of the circuit board 22, and the power circuit element 23 is arranged on the inside of the circuit board 22. The circuit board 22 is a board in which a through hole through which the cylindrical portion of the protective cover 41 can be inserted is formed in the center, and has a substantially octagonal shape, for example.

The light emitting element 21 and the power circuit element 23 are assembled on the lower surface of the circuit board 22. In other words, the circuit board 22 that fixes the circuit board 22 to the bulging portion 12 such that the surface where these elements are assembled becomes the bottom surface is arranged substantially parallel to the ceiling 100 and is fixed to the base 12A of the bulging portion 12 with screws, for example.

A suitable example of the light emitting element 21 is an LED (Light Emitting Diode) chip. It is also possible that the LED chip has a sealing layer containing, for example, a fluorescent substance. The fluorescent substance converts part of the blue light of the LED into light with a longer wavelength, and then mixes with the remaining part of the blue color, thereby outputting white Light. In the example shown in FIG. 1, a plurality of light-emitting elements 21 are assembled on the outer part of the lower surface of the circuit board 22. In addition, the plurality of light-emitting elements 21 are arranged in a ring shape to surround the through hole of the circuit board 22.

Examples of the power circuit components 23 include capacitance components such as electrolytic capacitors and ceramic capacitors, resistance components such as resistors, rectifier circuit components, coil components, choke coils, noise filters, diodes, and the like. In addition, the circuit board 22 may be provided with a control circuit for controlling the lighting state of the light emitting element 21 based on a signal from a sensor or the like, a communication circuit (receiving circuit) for receiving an operation signal from a remote control or the like, and the like. Since the appliance body 11 has excellent heat dissipation properties, it is possible to apply inexpensive components that do not require high heat resistance as circuit components such as power circuit components 23.

In the appliance body 11, a light source cover 24 and a power supply cover 25 are installed. The light source cover 24 covers the area of the circuit board 22 where the light-emitting elements 21 are assembled, and the power cover 25 covers the circuit board 22 for assembling the power circuit components 23 area. The light source cover 24 and the power supply cover 25 are formed in a substantially circular ring shape in a plan view, for example, and are fixed to the base 12A of the bulging portion 12 with screws. The light source cover 24 has a larger diameter than the power supply cover 25 and is configured to surround the power supply cover 25. It is suitable that the diameter of the light source cover 24 is slightly smaller than the diameter of the base 12A.

The light source cover 24 is preferably made of resin. The light source cover 24 is made of, for example, a colorless and transparent resin that transmits the light of the light-emitting element 21. Alternatively, it may be a milky-white cover that contains fillers and diffuses and transmits the light of the light-emitting element 21. On the other hand, the power supply cover 25 is a non-translucent cover, and is preferably made of metal. In addition, in order to prevent the user's finger from contacting the light-emitting module 20 from the gap between the light source cover 24 and the base 12A, a convex portion 14 is formed on the bulging portion 12. The details of the convex portion 14 will be described later.

The cover 30 is a translucent member covering the light-emitting module 20. The cover 30 has a diameter larger than the diameter of the appliance body 11, and preferably covers the entire underside of the appliance body 11 including the flange portion 13. The cover 30 is formed in a dome shape in accordance with the shape of the appliance body 11, for example. The cover 30 may be made of glass, but in consideration of light weight, a resin made is preferable. The cover 30 may also be colorless and transparent, but is generally milky white and has light diffusivity. In addition, the shape of the cover is not limited to a dome shape, and may be an ellipse, a rectangle, or the like in a plan view.

The cover 30 has a plurality of engaging protrusions 31. The engaging protrusions 31 protrude toward the inner side of the cover 30 and are formed in plural along the opening edge of the cover 30. A plurality of engaging portions 32 into which the engaging protrusions 31 of the cover 30 are fitted are provided on the lower surface of the flange portion 13. The engaging portions 32 are arranged along the circumferential direction of the flange portion 13 to correspond to the number and intervals of the engaging protrusions 31, for example. The cover 30 is easy to detach and assemble to the appliance body 11, can be assembled by fitting the engaging protrusion 31 to the engaging portion 32, and can be detached by removing the engaging protrusion 31 from the engaging portion 32. In addition, the engagement form of the appliance body and the cover is not limited to this.

In the luminaire 10, since the cover 30 is installed to cover the lower surface of the luminaire body 11, the heat generated by the light-emitting module 20 is mainly radiated from the upper surface of the luminaire body 11. However, since the appliance main body 11 is arranged close to the ceiling surface, heat tends to accumulate between the appliance main body 11 and the ceiling surface, and especially heat tends to accumulate in the recessed portion 16 formed on the upper surface side of the bulging portion 12. According to the lighting fixture 10 having the structure described in detail below, the heat accumulated in the recessed portion 16 can be reduced, and the temperature rise of the fixture can be suppressed.

Hereinafter, referring to FIG. 4 (enlarged view of part A in FIG. 3) as appropriate, the structure of the appliance body 11 will be described in more detail. For comparison, FIG. 5 shows the structure of a lighting device 200 of a conventional lighting fixture.

As shown in the example in Fig. 4, in the appliance body 11, the angle θ between the side wall 12B of the bulging portion 12 and the flange portion 13 is 90˚<θ≦130˚. In other words, the angle between the virtual line α drawn along the lower surface of the flange portion 13 parallel to the ceiling surface and the virtual line β drawn along the lower surface (outer surface) of the side wall 12B and intersecting the virtual line α on the lower surface side of each θ is greater than 90˚ and 130˚ or less. In addition, since the flange portion 13 is arranged to be substantially parallel to the surface, the angle θ is substantially the same as the inclination angle of the side wall 12B to the ceiling surface.

By making the angle θ larger than 90˚, preferably 95˚ or more, the appliance body 11 can be shaped. In addition, by making the angle θ 130˚ or less, preferably 125˚ or less, the heat dissipation of the appliance body 11 is greatly improved. In addition, without changing the diameter of the appliance body 11, by making the angle θ smaller, the flange portion 13 can be widened, and the elastic member 42 can be installed in a position invisible to the user.

In addition, in the bulging portion 12, a convex portion 14 is formed along the peripheral edge of the base portion 12A. The convex part 14 protrudes to the side opposite to the ceiling 100, and its front-end|tip is positioned vertically below the other part of the base part 12A. That is, the front end of the convex portion 14 becomes the lower end of the bulging portion 12. In addition, the tip of the convex portion 14 is preferably curved. The convex portion 14 does not have a flat surface along the horizontal direction, and the tip and its vicinity are largely curved.

In the example shown in FIG. 4, a flange 24A is formed along the periphery of the light source cover 24, and the convex portion 14 is formed at a position where the front end of the flange 24A faces. The convex portion 14 protrudes vertically downward to exceed the position of the lower surface of the flange 24A. By forming the convex portion 14, the user's finger can be prevented from contacting the light-emitting module 20 from the gap between the light source cover 24 and the base 12A.

On the other hand, in the lighting device 200 shown in the example of FIG. 5, the angle θx corresponding to the angle θ is, for example, 135˚. Because the larger the angle θx, the easier the formation of the bulging portion 212 becomes. Therefore, the angle θx of the conventional lighting fixture is generally 135˚～150˚. In addition, in the lighting device 200, the front end (lower end) of the convex portion 214 formed along the peripheral edge of the base portion 212A is flat and wide in the horizontal direction. In addition, it is easy to shape the convex portion 214 with a wide width.

The side wall 12B of the luminaire body 11 is inclined more vertically downward than the side wall 212B of the lighting device 200, and is inclined at an angle close to 90˚ to the ceiling surface. Furthermore, the front end of the convex portion 14 and its vicinity are not flat and wide as the convex portion 214, but are largely curved downward. The horizontal length of the side wall 12B and the convex portion 14 (the radial length of the appliance body 11) is much shorter than the side wall 212B and the convex portion 214, and the diameter of the bulging portion 12 is smaller than in the case of the lighting device 200.

Therefore, in the luminaire body 11, compared with the lighting device 200, although the molding system becomes more difficult, the space of the recessed portion 16 can be reduced, and the width of the flange portion 13 can be increased. It is considered that by making the space of the recessed portion 16 smaller, it is difficult for heat to accumulate between the appliance main body 11 and the ceiling 100, and the flange portion 13 constituting the peripheral portion of the appliance main body 11 is widened to improve heat dissipation.

In fact, when analyzing the temperature of the circuit board, it is found that the lighting fixture 10 equipped with the fixture body 11 suppresses the temperature rise by about 10% at most than the conventional lighting fixture equipped with the lighting device 200. In particular, the temperature drop in the power circuit area of the circuit board 22 is remarkable (93.72°C→83.62°C). In this way, if the lighting fixture 10 is used, good heat dissipation can be obtained, and the temperature rise of the fixture can be suppressed. For example, it is possible to use inexpensive components that do not require high heat resistance as circuit components, and to use inexpensive iron plates or iron alloy plates in the appliance body 11 can also ensure sufficient heat dissipation.

The angle θ is as shown above, as long as it exceeds 90˚ and 130˚ or less, 95˚~125˚ (95˚ or more and 125˚ or less, the same below) is preferable, and 95˚~120˚ is more preferable. The range of 95˚～115˚ is particularly good, and the range of 100˚～115˚ is the best. The angle θ can also be 100˚～125˚, or 100˚～120˚, or 100˚～115˚, or 105˚～115˚.

In addition, making the width of the flange portion 13 the same as the width of the flange portion 213 and making the diameter of the luminaire body 11 smaller than the diameter of the lighting device 200 can also reduce the size of the luminaire body 11. In this case, as in the case where the flange portion 13 is widened, good heat dissipation can be obtained, and the temperature rise of the appliance can be suppressed.

10‧‧‧Lighting appliance 11‧‧‧Apparatus body 12‧‧‧Protrusion part 12A‧‧‧Base part 12B‧‧‧Side wall 13‧‧‧Flange part 13A‧‧‧Perimeter wall14‧‧‧Convex surface 15‧‧‧ Through hole 16‧‧‧Concavity 20‧‧‧Light emitting module 21‧‧‧Light emitting element 22‧‧‧Circuit board 23‧‧‧Power circuit components 24‧‧‧Light source cover 24A‧‧‧Flange 25‧‧‧ Power cover 30‧‧‧Cover cover 31‧‧‧Snap protrusion 32‧‧‧Clamp part 40‧‧‧Clamp 41‧‧‧Protection cover 42‧‧‧Elastic member 50‧‧‧Power socket 51‧‧ ‧Adapter 100‧‧‧Ceiling

[Fig. 1] is an exploded perspective view of a lighting fixture as an example of the embodiment, viewed from below. [Fig. 2] is an exploded perspective view of the luminaire as an example of the embodiment viewed from above. [Fig. 3] is a cross-sectional view of a lighting fixture according to an example of the embodiment. [Fig. 4] is an enlarged view of part A in Fig. 3. Fig. 5 is a cross-sectional view showing an enlarged part of a conventional lighting fixture.

11‧‧‧Apparatus body

12‧‧‧Protrusion

12A‧‧‧Base

12B‧‧‧Sidewall

13‧‧‧Flange

14‧‧‧Convex

16‧‧‧Concave

24‧‧‧Light source cover

24A‧‧‧Flange

α‧‧‧Virtual Line

β‧‧‧Virtual Line

θ‧‧‧angle

Claims (3)

A lighting appliance installed on a ceiling, comprising: an appliance body having an bulging part that bulges to the opposite side of the ceiling, and a ring-shaped flange part formed around the bulging part; a light-emitting module, Fixed to the bulging part; and a cover covering the light emitting module and being fixed to the appliance body; the angle θ formed by the side wall of the bulging part and the flange part is 90°<θ≦130°; The bulging part has a base for fixing the light-emitting module; a convex part is formed along the periphery of the base, the convex part protrudes to the opposite side of the ceiling, and the front end is curved. For example, the lighting device of the first item of the scope of patent application has an elastic member installed on the surface of the flange portion facing the ceiling side; the elastic member is arranged on the inner side of the flange portion than the center in the width direction . For example, the lighting appliance of item 1 or 2 of the scope of patent application, in which the appliance system is composed of metal with iron as the main component.

Images