JP7525454B2 - lighting equipment - Google Patents

Description

An embodiment of the present invention relates to a lighting fixture that uses a light-emitting element such as an LED as a light source.

Recently, as LEDs have become more powerful, more efficient, and more widespread, lighting fixtures that use LEDs as light sources and are expected to have a long life for indoor or outdoor use have been developed.

For example, in lighting fixtures for general residential use, an adapter is electrically and mechanically connected to a hook-on ceiling body installed on the fixture mounting surface such as the ceiling, and a fixture body having a light source unit that uses an LED as a light source is attached to this adapter. Such lighting fixtures illuminate the room with light irradiated from the light source unit.

On the other hand, light-emitting elements such as LEDs generate heat when turned on, and as their temperature rises, the light output decreases and their service life shortens. For this reason, for lighting fixtures that use solid-state light-emitting elements such as LEDs and EL elements as their light sources, it is necessary to suppress the rise in temperature of the light-emitting elements in order to extend their service life and improve characteristics such as light-emitting efficiency.

The lighting fixture is also provided with a lighting device that is connected to the light source unit. This lighting device has circuit components and has the function of supplying power to the light source unit and controlling the lighting of the light-emitting element.

LED ceiling light: Sharp [Internet search July 22, 2011] (https://www.sharp.co.jp/led_lighting/ceiling/)

A lighting fixture according to an embodiment of the present invention is a lighting fixture whose rear side is attached to a ceiling surface, and is characterized in comprising: a main body; a shade arranged to cover the front side of the main body; a plurality of indirect light-emitting elements arranged inside the outer peripheral edge of the shade and on the rear side of the main body; a cover arranged inside the outer peripheral edge of the shade and on the rear side of the main body, the entirety of which is spaced apart from the ceiling surface and directly facing the ceiling surface , covering the indirect light-emitting elements; and a plurality of main light source light-emitting elements arranged on the main body so that the light emission direction is toward the front side of the main body.

A lighting fixture according to an embodiment of the present invention is a lighting fixture whose rear side is attached to a ceiling surface, and comprises: a main body; a shade arranged to cover the front side of the main body; a plurality of indirect light emitting elements arranged inside the outer peripheral edge of the shade and on the rear side of the main body; a cover arranged inside the outer peripheral edge of the shade and on the rear side of the main body, the entirety of which is spaced apart from the ceiling surface and directly facing the ceiling surface, covering the indirect light emitting elements; and a plurality of main light source light emitting elements arranged on the main body so that the light emission direction is toward the front side of the main body, wherein the cover has a plane parallel to the ceiling surface, the plane lies on a perpendicular line from the indirect light emitting elements to the ceiling surface, is spaced apart from the ceiling surface, and directly faces the ceiling surface .

According to an embodiment of the present invention, it is possible to provide a lighting fixture that effectively illuminates light toward the ceiling surface.

1 is a perspective view showing a lighting fixture according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing the front side of the lighting fixture. FIG. 2 is an exploded perspective view showing the rear side of the lighting fixture. FIG. 2 is a plan view showing the lighting fixture with the shade and the light source cover removed. FIG. 2 is a rear perspective view showing the lighting fixture. FIG. 2 is a vertical cross-sectional view showing the lighting fixture. 4 is a plan view showing the positional relationship between a light source unit and a lighting device. FIG. 4 is a cross-sectional view showing the lighting fixture attached to a ceiling surface. FIG.

The following describes an embodiment of the present invention with reference to Figs. 1 to 8. Figs. 1 to 6 and 8 show a lighting fixture, and Fig. 7 shows a light source and a lighting device. In each figure, wiring connections using lead wires and the like are omitted. Note that the same parts are given the same reference numerals, and duplicated explanations will be omitted.

The lighting fixture of this embodiment is for use in a general home and is attached to a ceiling hook body that acts as a wiring fixture installed on the fixture mounting surface, and illuminates the room with light emitted from a light source unit that has multiple light-emitting elements mounted on a board.

The lighting fixture comprises a fixture body 1, a light source unit 2, a lighting device 3, and a center member 4. The lighting fixture further comprises an attachment unit 5, a light sensor 6, a shade 7, a cover member 8, an indirect light source unit 9, and an elastic member 10. The lighting fixture also comprises an adapter A that is electrically and mechanically connected to a hook-on ceiling body Cb installed on a ceiling surface C as the fixture attachment surface (see FIG. 8). Such a lighting fixture is formed with a rounded circular appearance, with the front side serving as the light irradiation surface and the back side serving as the attachment surface to the ceiling surface C. These components will be explained in order.

As shown in Figures 2 to 6, the device body 1 is a thermally conductive chassis formed into a circular shape from a flat plate of a metal material such as a cold-rolled steel plate, and has a circular opening 11 formed in the approximate center in which the mounting part 5 (described later) is disposed. This opening 11 is formed in a shape that is approximately the same as the outer shape of the mounting part 5, with part of the circular shape protruding outward.

A protrusion 12 is formed on the outer periphery of the opening 11. The protrusion 12 is rectangular with rounded corners and protrudes toward the rear surface. A circular annular protrusion 13 is formed on the outer periphery of the protrusion 12, protruding toward the front surface. A circular annular protrusion 14 is formed on the outer periphery of the protrusion 13, protruding toward the rear surface so as to be radially continuous with the protrusion 13, in other words forming a recess on the front surface.

A shade receiving bracket 75 to which the shade 7 is detachably attached is disposed in the recess formed by the protrusion 14. These protrusions 12, 13, and 14 function primarily as mounting parts for members to be attached to the chassis, and also have the functions of reinforcing the strength of the chassis and increasing the heat dissipation area.

In this embodiment, the main body 1 corresponds to a chassis, but it may also be referred to as a case, a reflector, or a base. In general, it refers to a member or part on which the light source unit 2 is directly or indirectly disposed, and is not to be interpreted in a particularly restrictive manner.

As shown in Figures 2, 4, 6 and 8, the light source unit 2 includes a substrate 21 and a plurality of light-emitting elements 22 mounted on the substrate 21. The substrate 21 is formed by connecting four arc-shaped substrates 21 having a predetermined width dimension, and is generally formed in a circular shape as a whole. In other words, the substrate 21 formed in a generally circular shape as a whole is composed of four divided substrates 21.

By using a substrate 21 divided in this manner, the divided parts of the substrate 21 can absorb thermal contraction and suppress deformation of the substrate 21. Although it is preferable to use a substrate 21 divided into multiple parts, it is also possible to use a single substrate that is integrally formed into a roughly circular shape.

The substrate 21 is made of a flat plate of glass epoxy resin (FR-4), an insulating material, and has a wiring pattern formed on the front side using copper foil. The light-emitting elements 22 are electrically connected to this wiring pattern. In addition, a white resist layer that acts as a reflective layer is applied on top of the wiring pattern, i.e., on the front surface of the substrate 21.

If the material of the substrate 21 is an insulating material, a ceramic material or a synthetic resin material can be used. Furthermore, if it is made of metal, a metal base substrate can be used in which an insulating layer is laminated on one side of a base plate with good thermal conductivity and excellent heat dissipation properties, such as aluminum.

The light-emitting element 22 is an LED, and is a surface-mount type LED package. A number of these LED packages are mounted in multiple rows along the circumferential direction of the circular substrate 21, and in this embodiment, in three rows on the circumference of approximately concentric circles with different radii. In other words, they are mounted in an inner row, an outer row, and an intermediate row between the inner row and the outer row.

An LED package generally consists of an LED chip placed in a cavity formed of ceramics or synthetic resin, and a light-transmitting molding resin such as epoxy resin or silicone resin that seals the LED chip.

The LED packages mounted in the inner and outer rows use daylight white (N) and incandescent white (L) light emission colors, and are arranged alternately at approximately equal intervals on the circumference. The LED chips emit blue light. Phosphor is mixed into the translucent resin, and a yellow phosphor is used that emits yellow light, which is complementary to blue light, to enable the emission of daylight white (N) and incandescent white (L) white light.

The LED packages mounted in the middle row are those that emit red (R), green (G), and blue (B). Therefore, the LED chips are LED chips that emit red, green, and blue light, respectively, and these LED chips are sealed with a translucent molding resin.

These LED packages that emit red (R), green (G), and blue (B) light are arranged on the circumference in the order red (R), green (G), and blue (B) at approximately equal intervals.

The arrangement of red (R), green (G), and blue (B) in the LED package is not specified and may be in any order, for example, green (G), red (R), and blue (B). It is preferable to arrange adjacent LED packages that emit different colors, but this is not a limitation. As an example, it is possible to arrange two of the same color consecutively, such as red (R), red (R), green (G), green (G), blue (B), and blue (B).

In this way, a plurality of light-emitting elements 22 that emit daylight white (N) and incandescent light (L) are arranged in rows on the circumference of approximately concentric circles with different radii, and a plurality of light-emitting elements 22 that emit red (R), green (G) and blue (B) are arranged in rows on the circumference of a circle that is approximately coaxial with the above circles, between the rows of light-emitting elements 22 that emit daylight white (N) and incandescent light (L).

Therefore, since a plurality of light-emitting elements 22 with different light emission colors are arranged, i.e., light-emitting elements 22 that emit daylight white (N), incandescent white (L), red (R), green (G), and blue (B), a wide range of light colors can be expressed by mixing these, and the light color can be adjusted appropriately by adjusting the output of the light-emitting elements 22.

The LED may be mounted as an LED chip directly on the substrate 21, or as a bullet-shaped LED, and the mounting method and format are not particularly limited.

As shown representatively in Figures 4 and 6, the light source unit 2 configured in this manner is arranged such that the substrate 21 is located on the front side of the main body 1 around the opening 11, in other words, around the mounting portion 5 described below, and the mounting surface of the light emitting element 22 faces the front side, i.e., the downward irradiation direction. In addition, the back side of the substrate 21 is attached by a fixing means such as a screw so that it is in close contact with the inner side of the main body 1. Therefore, the substrate 21 is thermally coupled to the main body 1, and heat from the substrate 21 is conducted from the back side to the main body 1 and dissipated.

The substrate 21 may be directly attached to the main body 1 or indirectly attached via another member, and the manner of its installation is not particularly limited.

As shown in Figs. 2 and 6, a light source cover 25 is disposed on the front side of the light source unit 2. The light source cover 25 is made of a transparent synthetic resin having insulating properties, such as polycarbonate or acrylic resin, and is integrally formed in a substantially circular shape along the arrangement of the light emitting elements 22, and is disposed so as to cover the entire surface of the substrate 21 including the light emitting elements 22.

Therefore, the light emitted from the light-emitting element 22 passes through the light source cover 25. In addition, since the entire surface of the substrate 21 is covered, the charging section is covered by the light source cover 25, ensuring insulation. Furthermore, since the light source cover 25 is attached by screws in contact with the main body 1, heat from the main body 1 is conducted and dissipated.

The lighting device 3, as shown representatively in Figures 3, 6, and 7, comprises a circuit board 31 and circuit components 32 mounted on this circuit board 31. The circuit board 31 is made of glass epoxy resin (FR-4) or the like in a roughly rectangular shape, with a notch 31a formed in the center. This notch 31a is circular, and is formed by continuously cutting out a portion of it so that it protrudes outward. This notch 31a is the portion through which the mounting part 5, which will be described later, is inserted.

Therefore, the circuit board 31 is formed in a plate shape surrounding the periphery of the central portion, and the circuit components 32 are mounted on the surface side. Specifically, the circuit components 32 necessary for controlling the lighting of the light-emitting element 22 are mounted on the circuit board 31 around the cutout portion 31a, and for example, a control IC, a resistive element, a transformer, a switching transistor, a constant voltage diode, a full-wave rectifier, a capacitor, etc. are mounted.

In addition, among the circuit components 32, mainly heat generating components 32H that generate a relatively large amount of heat, such as a control IC, resistive elements, and transformers, are mounted near the cutout portion 31a, while circuit components that generate a relatively small amount of heat are mounted on the outer periphery.

The adapter A side is electrically connected to the circuit board 32, and is connected to a commercial AC power source via the adapter A. Therefore, the lighting device 3 receives this AC power source, generates a DC output, and supplies the DC output to the light-emitting element 22 via the lead wire, thereby controlling the lighting of the light-emitting element 22.

Such a lighting device 3 is attached to and covered by a lighting device cover 35 and is disposed on the rear side of the main body 1. In this case, the circuit board 31 is attached with the circuit components 32 facing the front side (the lower side in the figure).

The lighting device cover 35 is made of a metal material such as cold-rolled steel plate in the shape of a roughly rectangular short cylinder, with the side wall 35a sloping so that it widens toward the front side, and an opening 35c formed in the center of the back wall 35b.

As shown in Figures 3, 5, and 6, the front flange of this lighting device cover 35 is placed on the protruding portion 12 of the chassis, which is the main body 1, and is attached by screws and thermally connecting it.

As shown in Figures 2, 4 and 6, the center member 4 is made of a synthetic resin material such as PBT resin, is formed in a roughly short cylindrical shape, and has an opening 41 in the center that faces the hook ceiling body Cb. A ring-shaped space 42 is formed around the opening 41, and the optical sensor 6 described below is disposed in this space 42. Furthermore, a light receiving window 43 that faces the light receiving portion of the optical sensor 6 is formed in the front wall of the center member 4.

The center member 4 configured in this manner is attached by screwing the flange on the rear side to the chassis via the light source cover 25, as shown primarily in FIG. 6. The center member 4 can be attached directly or indirectly to the chassis, and the specific attachment configuration is not limited.

The mounting portion 5 is an adapter guide, a member into which the adapter A is inserted and engaged, and a member for mounting the lighting fixture to the ceiling surface C. As shown in Figures 3 and 6, the adapter guide is formed in a substantially cylindrical shape, and in the center is provided an engagement opening 51 into which the adapter A is inserted and engaged. This adapter guide is disposed in correspondence with the opening 11 formed in the center of the main body 1.

The attachment portion 5 does not necessarily have to be a member referred to as an adapter guide or the like. For example, it may be an opening formed in the main body 1, etc. In short, it refers to a member or part that faces the hook-on ceiling body Cb as a wiring device and engages with the adapter A.

As shown in FIG. 6, the light sensor 6 is an illuminance sensor, and is made up of a sensor element such as a photodiode, and operates to detect the brightness of the surroundings and output a detection signal. As a result, when the surroundings are bright, the light source unit 2, i.e., the light-emitting element 22, is controlled to be dimmed (dimmed) and turned on.

The optical sensor 6 is mounted on the substrate and is disposed and attached in the space 42 of the center member 4 so that its light receiving portion faces the light receiving window 43.

The shade 7 is made of a translucent, milky white diffusing material such as acrylic resin, and is formed in a generally circular shape with a circular opening 71 in the center. A decorative shade frame 7a is attached to the outer periphery of the shade 7, and this decorative shade frame 7a is made of a transparent material such as acrylic resin.

The shade 7 is removably attached to the outer periphery of the main body 1 so as to cover the front side of the main body 1 including the light source unit 2. Specifically, the shade 7 is attached by rotating the shade mounting bracket 74 provided on the shade 7 to engage with the shade receiving bracket 75 provided in the recess formed by the protrusion 14 of the main body 1.

When removing the shade 7, it can be removed by rotating the shade 7 in the opposite direction to when it was attached, and releasing the engagement between the shade mounting bracket 74 and the shade receiving bracket 75.

The shade 7 is preferably configured so that it can be detachably attached to the outer periphery of the main body 1, but may also be configured so that it can be fixed to the main body 1 by a fixing means such as a screw. This is because in a lighting fixture that uses a light-emitting element 22 as a light source and is expected to have a long life, there is little need to replace the light source or clean the inside for maintenance.

The distance between the light source cover 25 and the shade 7 is set to 20 to 60 mm, preferably 30 to 50 mm. This improves the uniformity of the emitted light, and allows the heat conducted from the main body 1 to the light source cover 25 to be effectively dissipated via the shade 7.

In addition, a thermally conductive polyolefin sheet or the like may be attached to the inner surface of the shade 7. In this case, it is possible to improve the heat dissipation from the shade 7.

As shown in Figs. 2 and 6, the cover member 8 is formed in a circular shape from a material such as transparent acrylic resin. This cover member 8 corresponds to the opening 71 of the shade 7, and is attached to the front wall of the center member 4 so as to cover and close the opening 41 of the center member 4. The cover member 8 also has a circular transparent portion 81 formed therein that faces the light receiving window 43 of the optical sensor 6.

It is preferable to attach a non-transparent film material or the like to the front side of the cover member 8, leaving at least the transparent portion 81.

The indirect light source unit 9 is disposed on the rear side of the main body 1, and mainly functions to brightly illuminate the ceiling surface. As shown in Figures 3, 5, and 6, multiple indirect light source units 9 are disposed around the mounting portion 5, and each unit includes a substrate 91 and multiple light-emitting elements 92 mounted on the substrate 91.

The substrate 91 is formed as a flat plate having a substantially rectangular shape, and the light-emitting elements 92 are mounted in a linear arrangement along the longitudinal direction of the substrate 91.

The board 91 on which the light emitting element 92 is mounted is attached to four locations on the side wall 35a of the lighting device cover 35. In this case, the lighting device cover 35 is formed in a roughly rectangular shape, and the board 91 is attached to the linear flat surface of the side wall 35a, so that the installation is stable.

In addition, the side wall 35a that forms the mounting portion of the substrate 91 is formed in an inclined shape that widens toward the front side, so that the substrate 91 is oriented diagonally upward, that is, toward the ceiling surface, and the light emitted from the light-emitting element 92 is effectively irradiated toward the ceiling surface.

Furthermore, each indirect light source unit 9 is covered with a box-shaped translucent cover 93.

The light-emitting element 92 is an LED, similar to the light source unit 2, and is a surface-mounted LED package. The light-emitting element 92 is connected to the lighting device 3 so that its lighting can be controlled.

The elastic member 10 is attached in the vicinity of the mounting position of each of the multiple indirect light source units 9. The elastic member 10 is disposed so as to be interposed between the lighting fixture and the ceiling surface C when the lighting fixture is mounted on the ceiling surface C, which serves as the fixture mounting surface (see FIG. 8).

Specifically, the elastic member 10 is a metal spring member made of a material such as stainless steel, and is attached to the back side of the lighting device cover 35 in a position corresponding to the mounting position of each indirect light source unit 9. The elastic member 10 is formed by bending a horizontally long rectangular leaf spring, and has a fixed portion 10a in the center, and extending portions 10b are formed on both sides of this fixed portion 10a so as to expand diagonally upward (toward the back side), and a rectangular contact portion 10c is formed at the tip side.

In addition, a screw through hole is formed in the fixing portion 10a, and the elastic member 10 is fixed to the rear side of the lighting device cover 35 by a mounting screw that passes through this screw through hole and is screwed into the rear side of the lighting device cover 35.

Multiple such elastic members 10, i.e., four of them, are used, all of which have the same shape and the same elastic force.

When the elastic member 10 is in a fixed state, as shown in FIG. 6, the elastic member 10 arranged on the rear side of the lighting device cover 35 can be elastically deformed with a spring action toward the front side (in the direction of the arrow in the figure) with the fixed part 10a as a fulcrum.

As shown in Figure 8, the adapter A is electrically and mechanically connected to the hook-in ceiling body Cb installed on the ceiling surface C by a hook blade provided on the top side, and is approximately cylindrical in shape. A pair of locking parts A1 are provided on both sides of the peripheral wall so that they always protrude to the outer periphery by a built-in spring. The locking parts A1 are retracted by operating a lever provided on the underside. In addition, a power cord (not shown) that connects to the lighting device 3 is led out from the adapter A, and is connected to the lighting device 3 via a connector.

In the lighting fixture configured in this manner, the positional relationship between the light source unit 2 and the lighting device 3 will be described with reference to Figures 4, 6, and 7. Note that Figure 7 is an explanatory diagram showing the positional relationship between the light source unit 2 and the lighting device 3 in a plan view.

The light source unit 2 is configured by mounting a plurality of light-emitting elements 22 on the circumference of a substantially circular substrate 21. The back side of this substrate 21 is thermally coupled to the main body 1. Therefore, the plurality of light-emitting elements 22 are arranged around the mounting portion 5, and specifically, as shown mainly in Figures 4 and 7, they are arranged so as to surround the mounting portion 5 in a plan view.

On the other hand, as shown in FIG. 6, the lighting device 3 is disposed on the rear side of the main body 1, and is attached to the lighting device cover 35 with a distance d between it and the light source unit 2 in the rear direction. Furthermore, the circuit components 32 are disposed so as to surround the periphery of the mounting portion 5 that passes through the cutout portion 31a of the circuit board 31, and are positioned inside the multiple light-emitting elements 22 that are arranged around the circumference, as shown in FIG. 7.

In addition, heat generating components 32H that generate a relatively large amount of heat among the circuit components 32 are arranged near the mounting portion 5.

Therefore, the light-emitting element 22 in the light source unit 2 and the circuit component 32 in the lighting device 3 are positioned with a separation distance d in the rear direction, and the circuit component 32 is positioned inside the light-emitting element 22. In other words, the light-emitting element 22 and the circuit component 32 are positioned with a deviation in both the vertical direction (front-to-back direction) and the horizontal direction (radial direction). Also, among the circuit components 32, the heat-generating component 32H is positioned away from the light-emitting element 22.

As a result, the light-emitting element 22 and the circuit component 32 are arranged so as to be thermally isolated, and mutual thermal interference of the heat generated by the light-emitting element 22 and the circuit component 32 can be suppressed.

The light emitting element 22 and the circuit components 32 are arranged around the mounting portion 5, making it possible to construct the device in a compact manner. Furthermore, the lighting device 3 is arranged on the rear side of the main body 1, making it possible to ensure a predetermined light distribution range without narrowing the range of light emitted from the light source unit 2.

Next, the installation state of the lighting fixture on the ceiling surface C will be described with reference to Figure 8. First, the adapter A is electrically and mechanically connected to the hook-on ceiling body Cb that has been installed on the ceiling surface C in advance. With the cover member 8 of the lighting fixture removed, the installation operation is performed by aligning the engagement port 51 of the adapter guide with the adapter A and pushing the fixture body 1 up from below against the elastic force of the elastic member 10 with the hand until the locking portion A1 of the adapter A is securely engaged with the engagement port 51 of the adapter guide.

Next, the cover member 8 is attached to cover and close the opening 41 in the center of the center member 4 that faces the hook-in ceiling body Cb.

In this state, the elastic member 10 is elastically deformed, and the contact portion 10c is in elastic contact with the ceiling surface C. The contact portion 10c can then be in contact with the ceiling surface C in a substantially planar, parallel manner or with its tip pointing slightly vertically.

The elastic member 10 is therefore interposed between the rear side of the lighting device cover 35, which is the rear side of the fixture body 1, and the ceiling surface C, with elastic deformation in the compression direction, and the lighting fixture body 1 is securely held and attached to the ceiling surface C by the spring action of the elastic member 10.

More specifically, the action of the elastic member 10 makes it possible to maintain a constant distance between the ceiling surface C and each indirect light source unit 9, and to make the emission angle of the light emitted from each indirect light source unit 9 constant. As a result, the light distribution characteristics can be stabilized, and it becomes possible to effectively illuminate the ceiling surface C and provide indirect lighting. Moreover, since the elastic member 10 corresponds to each indirect light source unit 9 and is disposed in its vicinity, it is expected that the effect of more reliably maintaining a constant distance between the ceiling surface C and each indirect light source unit 9 can be achieved.

When removing the lighting fixture, the cover member 8 is removed, and the lever provided on the adapter A is operated through the opening 41 of the center member 4 to release the engagement of the locking portion A1 of the adapter A, thereby enabling removal.

When power is supplied to the lighting device 3 while the lighting fixture is attached to the ceiling surface C, electricity is passed through the light-emitting elements 22 via the board 21 in the light source unit 2, and each light-emitting element 22 lights up. The light emitted from the light-emitting elements 22 to the front side passes through the light source unit cover 25, and is diffused and transmitted by the shade 7 and irradiated outward. Therefore, the downward area is illuminated with a predetermined light distribution range.

At the same time, when electricity is applied to the indirect light source unit 9, each light-emitting element 92 lights up, and the light emitted diagonally upward from the light-emitting elements 92 passes through the translucent cover 93 and is irradiated mainly onto the ceiling surface, as if it were being emitted from the periphery of the adapter guide 5. This makes the ceiling surface brighter, improving the sense of brightness in the space.

In this case, the light distribution characteristics of the light emitted from the indirect light source unit 9 can be stabilized, making it possible to provide effective indirect lighting.

When the light-emitting element 22 is used as the light source in the light source unit 2 in this way, the light emitted from the light-emitting element 22 has a strong directivity, so the light distribution range tends to be narrow. However, by providing an indirect light source unit 9 on the back side of the main body 1 as in this embodiment, the sense of brightness of the space can be improved. Therefore, providing an indirect light source unit 9 is an effective measure when the light source of the light source unit 2 is the light-emitting element 22.

Furthermore, the lighting state of the light source unit 2 and the indirect light source unit 9 is controlled by a light sensor 6 that detects the surrounding brightness and outputs a detection signal.

The heat generated by the light-emitting element 22 is effectively conducted to the main body 1 because the back side of the substrate 21 is thermally coupled to the main body 1, and dissipated over a wide area. In addition, the main body 1 is formed with protrusions 12, 13, and 14, which increases the heat dissipation area and further enhances the heat dissipation effect.

In addition, the lighting device cover 35 is placed and attached to the protruding portion 12 of the main body 1, so heat is conducted from the main body 1 to the lighting device cover 35, promoting heat dissipation.

On the other hand, heat generated by the lighting device 3 is dissipated mainly by convection in the space within the lighting device cover 35.

In this case, the light-emitting element 22 and the circuit component 32 are positioned with a distance d between them in the rear direction, and the circuit component 32 is positioned inside the light-emitting element 22, so they are arranged so as to be thermally isolated, and mutual thermal interference can be suppressed. Therefore, it is possible to suppress excessive temperature rise in the light-emitting element 22 and the circuit component 32.

Furthermore, the heat-generating components 32H in the circuit components 32 are positioned away from the light-emitting elements 22, so that mutual thermal interference can be suppressed even more effectively.

In addition, heat generated by the light-emitting element 92 of the indirect light source unit 9 is conducted from the back side of the substrate 91 to the side wall 35a of the lighting device cover 35, and is further conducted to the elastic member 10 and dissipated.

(Additional Note) This embodiment includes the following aspects.
In conventional lighting fixtures, the heat generated by the light-emitting elements in the light source unit and the heat generated by heat-generating components in the circuit components in the lighting device, such as semiconductor components and resistive elements, can interfere with each other, resulting in excessive temperature increases in the light-emitting elements and circuit components.

The lighting fixture according to the embodiment of the present invention has been developed in consideration of the above problems, and aims to provide a lighting fixture that can suppress mutual thermal interference between the light-emitting element in the light source section and the circuit components in the lighting device.

A lighting fixture according to an embodiment of the present invention comprises: a main body having an opening; a light source unit having a plurality of light-emitting elements and disposed on the front side of the main body so that light emitted from the light-emitting elements is directed toward the front side; a lighting device disposed within a cover protruding from the rear side of the main body and controlling the lighting of the light-emitting elements; a main body having an opening; a light source unit having a plurality of light-emitting elements and disposed on the front side of the main body so that light emitted from the light-emitting elements is directed toward the front side; a lighting device disposed within a cover protruding from the rear side of the main body and controlling the lighting of the light-emitting elements; and an indirect light source unit disposed outside the lighting device cover and near the outside of the elastic member.

As described above, this embodiment makes it possible to provide a lighting fixture that can suppress thermal interference between the light-emitting elements in the light source section and the circuit components in the lighting device.

The present invention is not limited to the configuration of the above embodiment, and various modifications are possible without departing from the gist of the invention. Furthermore, the above embodiment is presented as an example, and is not intended to limit the scope of the invention.

Reference Signs List 1: fixture body (chassis), 2: light source unit, 3: lighting device, 4: center member, 5: mounting unit (adapter guide), 6: light sensor, 7: shade, 8: cover member, 9: indirect light source unit, 10: elastic member, 21: circuit board, 22: light emitting element (LED), 25: light source unit cover, 31: lighting device board, 32: circuit component, 32H: heat generating component, 35: lighting device cover, A: adapter, C: fixture mounting surface (ceiling surface), Cb: wiring device (hook-in ceiling body), d: separation distance

Claims (1)

A lighting fixture whose rear side is attached to a ceiling surface,
The main body;
A shade provided to cover the front side of the main body;
A plurality of indirect light emitting elements are provided inside the outer periphery of the shade and on the rear side of the main body;
a cover provided on the inside of the outer periphery of the shade and on the rear side of the main body, the cover being spaced apart from the ceiling surface and directly facing the ceiling surface, and covering the indirect light emitting element;
a plurality of main light source light emitting elements arranged on the main body such that the light emission direction is toward the front side of the main body;
Equipped with
The cover has a plane parallel to the ceiling surface, the plane existing on a perpendicular line from the indirect light emitting element to the ceiling surface, spaced apart from the ceiling surface, and directly facing the ceiling surface .

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