WO2012020646A1

WO2012020646A1 - Lighting fixture

Info

Publication number: WO2012020646A1
Application number: PCT/JP2011/067144
Authority: WO
Inventors: 豊本田; 森山　厳與; 光三小川; 一斎樋口; 重利小宮山; 真一神代
Original assignee: 東芝ライテック株式会社
Priority date: 2010-08-09
Filing date: 2011-07-27
Publication date: 2012-02-16
Also published as: EP2604912A1; JPWO2012020646A1; EP2604912A4

Abstract

The invention provides a lighting fixture (1) comprising: a light-emitting module (2) using a light-emitting element as a light source, having a light-outputting section (23) for outputting light from the light source, exhibiting a heat-conducting property in at least part of an outer shell (21), and being thermally coupled with the light-emitting element; a heat sink (3) provided on the rear surface side of the light-emitting module (2) and thermally coupled to part of the outer shell (21); a heat-conductive light-distribution member (4) adapted to enclose the perimeter of the light-outputting section (23) of the light-emitting module (2) and provided with a reflecting face spreading outward in the direction of light irradiation; and a connecting member (5) for connecting the light distribution member (4) and part of the outer shell (21), and transmitting heat from the outer shell (21) to the light distribution member (4).

Description

lighting equipment

Embodiments of the present invention relate to a lighting fixture that uses a light emitting element such as an LED as a light source and can improve the heat dissipation of the light emitting element.

The light output of a light emitting element such as an LED decreases as the temperature increases. In addition, the service life is shortened. For this reason, for lighting fixtures that use solid light emitting elements such as LEDs and EL elements as light sources, it is possible to suppress the temperature of the light emitting elements from rising in order to extend the service life or improve characteristics such as light emission efficiency. It is necessary.

For this reason, in lighting fixtures employing LEDs as light sources, attempts have been made to improve heat dissipation by transferring heat generated from the LEDs to the fixture body or by circulating outside air through the fixture body. Moreover, in these lighting fixtures, in order to irradiate the light radiate | emitted from LED in the target direction, light distribution control is made | formed by a light distribution member (for example, reflecting plate).

JP 2006-172895 A JP 2008-186776 A

However, in the above-described conventional lighting fixture, the light distribution member is not effectively used to improve the heat dissipation effect.

An object of the present invention is to provide a lighting fixture that effectively uses a light distribution member, promotes heat radiation from the front side and the back side of a light emitting module, and effectively suppresses a temperature rise of the light emitting element.

The lighting fixture of the present invention uses a light emitting element as a light source, and has a light emitting portion from which light from the light source is emitted, and at least a part of the outer shell has thermal conductivity and is thermally connected to the light emitting element. A combined light emitting module is provided. Further, a heat sink provided on the back side of the light emitting module and thermally coupled to a part of the outer shell, and a reflection that surrounds the light emitting portion of the light emitting module and expands in the light irradiation direction. And a light distribution member having thermal conductivity and having a surface. Then, the connection member connects the light distribution member and a part of the outer shell to transfer heat from the outer shell to the light distribution member.

According to the present invention, it is possible to provide a lighting fixture that effectively uses a light distribution member, promotes heat radiation from the front side and the back side of the light emitting module, and effectively suppresses the temperature rise of the light emitting element.

It is a perspective view which shows the lighting fixture which concerns on the 1st Embodiment of this invention. It is a side view which makes the right half of the light distribution member and the connection member in the lighting fixture cross section. It is a top view which shows the same lighting fixture seeing from the downward side. It is a perspective view which shows the light emitting module and connection member in the same lighting fixture. It is a top view which shows the connection member in the lighting fixture. It is a rear view which shows the connection member in the same lighting fixture. It is a side view which shows the connection member in the same lighting fixture. It is a top view which shows the same lighting fixture seeing from upper side. It is a top view which shades and shows the contact state of a connection member and a light distribution member in FIG. It is a top view equivalent to FIG. 8 in the lighting fixture which concerns on the 2nd Embodiment of this invention. It is a top view which shades and shows the contact state of a connection member and a light distribution member in FIG. It is a perspective view which shows the lighting fixture which concerns on the 3rd Embodiment of this invention. It is a side view which makes the right half of the light distribution member and the connection member in the lighting fixture cross section. It is a top view which shows the connection member in the lighting fixture. It is a side view which shows the connection member in the same lighting fixture. It is a side view which makes the right half of the light distribution member and the connection member in the lighting fixture which concerns on the 4th Embodiment of this invention make a cross section.

A lighting apparatus according to the first embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same part in each figure, and the overlapping description is abbreviate | omitted.

The lighting fixture of this embodiment is a type of downlight 1 that is installed in a ceiling, and as shown in FIGS. 1 and 2, a light emitting module 2, a heat sink 3, a light distribution member 4, and a connection member 5. And a power supply unit (not shown). A pair of attachment leaf springs 6 are mounted on the outer peripheral side of the light distribution member 4. In FIG. 2, the radiation fins 31 and the attachment leaf spring 6 formed on the heat sink 3 are not shown (the same applies to FIGS. 13 and 16 hereafter).

As representatively shown in FIG. 4, the light emitting module 2 includes a substantially rectangular parallelepiped housing 21, a substrate disposed in the outer shell 21, and light emission as a light source mounted on the substrate. An element and a phosphor thin film layer 22 provided on the front side of the light emitting element are provided. Incidentally, for example, an LED downlight module manufactured by Philips can be applied to the light emitting module 2.

The light emitting element is a surface mount type LED, and a plurality of these LEDs are mounted on a substrate. An LED that emits blue light is used to emit white light. A circular phosphor thin film layer 22 is provided so as to cover the substrate. The phosphor thin film layer 22 is made of a yellow phosphor that emits yellow light that is complementary to blue light so that white light can be emitted. Accordingly, the front surface side of the phosphor thin film layer 22 is configured as the light emitting portion 23, and the light emitted from the LED passes through the phosphor thin film layer 22 and is emitted as white light from the light emitting portion 23 to the outside. The

The housing 21 is formed of a metal material such as aluminum having at least a part, for example, both side surfaces 21a and back surface 21b having thermal conductivity. The outer shell 21 is thermally coupled to the light emitting element through the substrate so that heat generated from the light emitting element is conducted. Note that a power supply line introduction port 24 into which a power supply line for supplying power to the LED is introduced is formed on one surface of the outer shell 21.

As shown in FIG. 1, the heat sink 3 has a substantially short cylindrical shape. The heat sink 3 is formed with a large number of metal heat radiation fins 31 extending in the vertical direction on the outer periphery. Further, a blower mechanism 32 is built in the central portion, and the blower mechanism 32 vibrates the diaphragm with an electromagnetic coil, thereby forcing air to flow through the heat radiation fins 31. The heat sink 3 is thermally coupled and attached so as to contact the back surface 21b of the outer shell 21. Incidentally, for example, a Synjet DML cooler manufactured by Nuventix can be applied to the heat sink 3.

As shown mainly in FIG. 2, the light distribution member 4 is formed in a substantially umbrella shape that expands toward the irradiation direction of the light emitted from the light emitting portion 23, that is, toward the front side. The light distribution member 4 is provided so as to surround the light emitting portion 23 in a circular shape. Moreover, the inner peripheral surface is configured as a curved reflecting surface.

More specifically, the light distribution member 4 includes a first light distribution member 41 located on the light emitting part 23 side of the light emitting module 2 and a second light distribution member 42 located on the light irradiation opening (irradiation direction) side. And are screwed and combined. The first light distribution member 41 is made of a metal material having good thermal conductivity such as aluminum, and has a white coating on the surface. Further, the inner peripheral surface has a R-shaped cross section, and a reflection surface 41a is formed.

The second light distribution member 42 is made of a synthetic resin material such as polycarbonate or ABS resin, and has a white color. Further, the inner peripheral surface is formed so that the reflection surface 42 a is formed with an R-shaped cross section and is continuous with the reflection surface 41 a of the first light distribution member 41.

However, the radius of curvature R of the reflection surface 41a of the first light distribution member 41 and the reflection surface 42a of the second light distribution member 42 are different. For example, the curvature radius R of the reflection surface 41a of the first light distribution member 41 is 80 mm, and the curvature radius R of the reflection surface 42a of the second light distribution member 42 is 100 mm. Therefore, the curvature (1 / R) of the reflection surface 41 a of the first light distribution member 41 is set to be larger than the curvature (1 / R) of the reflection surface 42 a of the second light distribution member 42.

Also, the second light distribution member 42 is integrally formed with an annular flange 42b extending in the outer peripheral direction as a decorative frame at the substantially circular opening end portion that expands toward the front side.

The light distribution member 4 configured in this manner has a function of controlling the light distribution of the light emitted from the light emitting portion 23 by the form of the curved reflection surfaces 41a and 42a that expand toward the front side. For example, it has a function of suppressing glare.

As representatively shown in FIGS. 5 to 7, the connection member 5 is made of a material having thermal conductivity. For example, the connection member 5 is formed from a cold-rolled steel plate as a whole in a substantially U shape and is white. Has been painted. The connecting member 5 includes a pair of side walls 51 facing each other and a back wall 52 connecting the side walls 51. The pair of side walls 51 and the back wall 52 are formed in a substantially rectangular shape. A pair of attachment pieces 53 are formed in a substantially central portion on the lower side of the side wall 51 so as to extend in the direction orthogonal to the side wall 51 and outward. The pair of attachment pieces 53 have screw through holes 53a. In addition, an opening 52 a is formed in the back wall 52 at a position facing the power line inlet 24 of the light emitting module 2.

As shown in FIGS. 1, 2, and 4, the connection member 5 configured as described above is screwed and attached so that the pair of side walls 51 are in close contact with both side surfaces 21 a of the light emitting module 2. . Further, in the connection member 5, the pair of attachment pieces 53 are arranged on the upper surface on the back side of the first light distribution member 41 and attached to the light distribution member 4 with attachment screws. The mounting screw passes through the screw through hole 53a of the mounting piece 53, further passes through the screw through hole of the first light distribution member 41, and is screwed into the screw hole of the second light distribution member 42 (see FIG. 2). ).

Therefore, the light distribution member 4 is attached to the light emitting part 23 side of the light emitting module 2 by the connecting member 5. In this case, the pair of side walls 51 of the connection member 5 are in surface contact with both side surfaces 21 a of the light emitting module 2, and the mounting piece 53 is in surface contact with the light distribution member 4, that is, the first light distribution member 41. is doing. By these, the heat from the light emitting module 2 can be effectively transmitted to the first light distribution member 41. FIG. 9 shows a shaded area where the mounting piece 53 is in surface contact with the first light distribution member 41.

A power supply unit (not shown) is connected to a power supply, includes a power supply circuit and a connection terminal, and is electrically connected to the light emitting module 2. Specifically, the power supply unit and the light emitting module 2 are connected by a power supply line led out from the power supply line introduction port 24 of the light emitting module 2. Electric power is supplied to the light emitting module 2 through the power line.

When installing such a downlight 1, it is inserted from the power supply unit side into the embedding hole on the ceiling surface, and is supported by the mounting leaf spring 6 in a state of being embedded on the back side of the ceiling surface. In this case, the flange 42b of the second light distribution member 42 is larger in diameter than the embedding hole on the ceiling surface, and is hooked from below on the periphery of the embedding hole in a state where the downlight 1 is installed on the ceiling surface. Yes.

Next, when the power supply unit is energized from the power supply, the light emitting element emits light by supplying power to the substrate of the light emitting module 2. Most of the light emitted from each light emitting element through the phosphor thin film layer 22 is emitted forward (directly below). Further, a part of the light is irradiated by the light distribution controlled by the reflection surface of the light distribution member 4 and forward.

Here, the curvature (1 / R) of the reflection surface 41 a of the first light distribution member 41 is set to be larger than the curvature (1 / R) of the reflection surface 42 a of the second light distribution member 42. Therefore, the light emitted from each light emitting element through the phosphor thin film layer 22 and emitted and reflected by the reflecting surface 41a is efficiently irradiated in the direct downward direction (use direction). If the curvature (1 / R) of the reflection surface 41a of the first light distribution member 41 is the same or larger than the curvature (1 / R) of the reflection surface 42a of the second light distribution member 42, the reflection surface 41a. The light reflected by the light may be diffusely reflected within the reflecting surface, which may reduce the light use efficiency.

During the light emission of the light emitting element, heat is generated. The heat generated from the light emitting element is mainly conducted to the both side surfaces 21 a and the back surface 21 b of the outer shell 21 of the light emitting module 2. The heat conducted to the back surface 21 b is conducted to the heat sink 3, is transmitted to the numerous heat radiation fins 31 and is radiated at this portion. The heat conducted to both side surfaces 21a is conducted from the pair of side walls 51 of the connection member 5 to the mounting piece 53, conducted to the first light distribution member 41, and radiated from the front side.

That is, the heat generated from the light emitting element is effectively dissipated from the front side and the back side of the light emitting module 2, and the temperature rise of the light emitting element can be suppressed. Moreover, the light distribution member 4 can be used effectively in the heat radiation from the front side. In addition, since the air is blown in the direction indicated by the arrow in FIG. 2 from the air blowing mechanism 32 of the heat sink 3 toward the light distribution member 4 by energization, the radiating fins 31 and the first light distribution member 41 are forcibly cooled. The suppression of the temperature rise of the light emitting element can be ensured.

Further, the light distribution member 4 is formed of the first light distribution member 41 made of a metal material having good thermal conductivity and the second light distribution member 42 made of a synthetic resin material, so that promotion of heat dissipation is ensured. However, the light distribution can be reduced and predetermined light distribution control can be realized.

In addition, it is preferable to form the reflectance of the reflective surface 41a of the first light distribution member 41 located on the light emitting part 23 side of the light emitting module 2 higher than the reflectance of the reflective surface 42a of the second light distribution member 42. . By increasing the reflectance of the reflecting surface 41a of the first light distribution member 41, the ratio of the reflected light reflected by the reflecting surface 41a returning to the light emitting unit 23 again by irregular reflection can be reduced. Accordingly, it is possible to suppress a decrease in light use efficiency and a change in the color temperature of emitted light. In order to increase the reflectance of the reflection surface 41a of the first light distribution member 41, for example, it can be realized by performing mirror processing or the like on the reflection surface 41a.

Furthermore, both the first light distribution member 41 and the second light distribution member 42 may be formed of a metal material having good thermal conductivity such as aluminum. Further, the first light distribution member 41 and the second light distribution member 42 may be integrally formed. In these cases, the heat dissipation of the heat conducted from the light emitting module 2 can be enhanced.

Furthermore, in this embodiment, although the thing which incorporated the ventilation mechanism 32 in the heat sink 3 was demonstrated, the ventilation mechanism 32 is not necessarily required. This is because the heat radiation performance may be satisfied by increasing the heat radiation area by the heat radiation fins 31 or the like.

Next, a lighting apparatus according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part which is the same as that of 1st Embodiment, or an equivalent part, and the overlapping description is abbreviate | omitted.

In this embodiment, the attachment piece 54 is formed from the lower side of each of the

walls

51 and 52 of the pair of side walls 51 and the back wall 52 in the connection member 5 formed in a substantially U shape. The attachment piece 54 extends in the direction perpendicular to the

walls

51 and 52 and outward. The attachment piece 54 extending from each of the

walls

51 and 52 extends to the outer peripheral edge of the upper surface on the back side of the first light distribution member 41 and is formed in an arc shape.

Accordingly, in combination with the fact that the mounting piece 54 extends from each of the

walls

51 and 52, as shown in FIG. 11, the mounting piece 54 is in surface contact with the first light distribution member 41. The area can be increased. For this reason, the heat conduction from the light emitting module 2 to the light distribution member 4 can be improved.

In this case, the mounting piece 54 extends to the outer peripheral edge of the upper surface of the first light distribution member 41, but its diameter is smaller than the outer diameter of the heat sink 3. For this reason, when installing the downlight 1, the effect that it is easy to insert in the embedding hole of a ceiling surface can be expected.

In addition, it is preferable that the attachment piece 54 is in surface contact in a region that is at least half of the area of the upper surface of the first light distribution member 41.

Next, a lighting fixture according to a third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part which is the same as that of 1st Embodiment, or an equivalent part, and the overlapping description is abbreviate | omitted.

In this embodiment, the heat sink 3 and the light distribution member 4 are connected, and the connection member 7 that transmits heat from the heat sink 3 to the light distribution member 4 is provided.

The basic configuration is the same as in the first embodiment. The lighting fixture of the present embodiment uses a light emitting element as a light source, and has a light emitting portion 23 from which light from the light source is emitted, and at least a part of the outer shell 21 has thermal conductivity so that the light emitting element and the heat And a heat sink 3 provided on the back side of the light emitting module and thermally coupled to a part of the outer shell 21, specifically, the back surface 21b. Moreover, the light distribution member 4 which has the reflective surface which surrounds the circumference | surroundings of the light emission part 23 of the light emitting module 2, and has a reflective surface expanded toward the light irradiation direction is provided.

And, it is configured to include a connection member 7 that transfers heat from the heat sink 3 to the light distribution member 4.

The connecting member 7 is made of a material having thermal conductivity, and is formed, for example, in a cylindrical shape from a cold-rolled steel plate and is painted white. The connecting member 7 has an inner diameter dimension that is substantially the same as the outer shape of the heat sink 3, that is, the outer diameter of the radiating fin 31. A plurality of (four) attachment pieces 73 are provided on the cylindrical lower end side. Each attachment piece 73 has a screw through hole 73a. Each attachment piece 73 is formed to extend inward and in a direction orthogonal to the cylinder so as to face each other with an interval of approximately 90 °.

As shown in FIGS. 12 and 13, the connecting member 7 configured in this way covers the outer periphery of the light emitting module 2 with a predetermined gap G and the outer peripheral surface of the radiating fin 31. Are attached to the heat dissipating fins 31 with screws.

On the other hand, each attachment piece 73 is provided on the upper surface on the back side of the first light distribution member 41 and is attached to the light distribution member 4 by an attachment screw. The mounting screw passes through the screw through hole 73 a of the mounting piece 73, further passes through the screw through hole of the first light distribution member 41, and is screwed into the screw hole of the second light distribution member 42.

In such a configuration, heat is generated during light emission of the light emitting element. The heat generated from the light emitting element is mainly conducted to the both side surfaces 21 a and the back surface 21 b of the outer shell 21 of the light emitting module 2. The heat conducted to the back surface 21 b is conducted to the heat sink 3, is transmitted to the numerous heat radiation fins 31 and is radiated at this portion. Further, the heat transmitted to the large number of heat dissipating fins 31 is conducted to the connecting member 7 in contact with the heat dissipating fins 31 and is dissipated by a cylinder having a large area, and from the mounting piece 73 to the first light distribution member 41. Conducted and dissipated from the front side.

As described above, the heat generated from the light emitting element is effectively dissipated from the front side and the back side of the light emitting module 2, and the temperature rise of the light emitting element can be suppressed. Moreover, the light distribution member 4 can be used effectively in the heat radiation from the front side. Furthermore, heat dissipation can be enhanced by the cylindrical connecting member 7 having a large area.

In addition, as shown by the arrow in FIG. 13 from the air blowing mechanism 32 of the heat sink 3 to the light distribution member 4 by energization, the air is efficiently blown through the gap G, and the heat radiating fins 31, the connecting members 7, the first. Since the light distribution member 41 is forcibly cooled, the temperature rise of the light emitting element can be reliably suppressed.

Next, a lighting fixture according to a fourth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part which is the same as that of 3rd Embodiment, or an equivalent part, and the overlapping description is abbreviate | omitted.

In the present embodiment, in addition to the configuration of the third embodiment, a second connection member 8 that thermally conductively connects the light emitting module 2 and the cylindrical connection member 7 is provided.

The second connecting member 8 is made of a material having thermal conductivity, and is formed by bending a cold rolled steel plate, for example. The second connection member 8 includes an attachment piece 8a attached to the inner surface side of the cylindrical connection member 7 and an attachment piece 8b attached to the light emitting module 2 side.

A pair of second connecting members 8 are provided. The second connection member 8 has an attachment piece 8a attached to the inner surface side of the cylindrical connection member 7 by welding or the like, and an attachment piece 8b attached to the side surface 21a of the light emitting module 2 by screws.

In such a configuration, heat generated from the light emitting element is mainly conducted to the both side surfaces 21 a and the back surface 21 b of the outer shell 21 of the light emitting module 2. The heat conducted to the back surface 21 b is conducted to the heat sink 3, is transmitted to the numerous heat radiation fins 31 and is radiated at this portion. Further, the heat transmitted to the large number of heat dissipating fins 31 is conducted to the connecting member 7 in contact with the heat dissipating fins 31 and is dissipated by a cylinder having a large area, and from the mounting piece 73 to the first light distribution member 41. Conducted and dissipated from the front side.

Furthermore, heat on both side surfaces 21a of the housing 21 of the light emitting module 2 is conducted to the second connecting member 8, and this heat is conducted to the cylindrical connecting member 7 and radiated. At the same time, conduction from the connecting member 7 to the heat radiation fins 31 and the first light distribution member 41 is promoted.

Therefore, a heat radiation path is formed from the both side surfaces 21a and the back surface 21b of the outer shell 21 of the light emitting module 2, and the heat radiation effect can be improved.

The present invention is not limited to the configuration of the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. The light emitting module and the heat sink are not particularly limited to the configuration of the above embodiment. For example, the outer shell of the light emitting module can be applied to a rectangular parallelepiped shape or a cylindrical shape.

Also, solid-state light emitting elements such as LEDs and EL elements can be applied to the light emitting elements provided in the light emitting module.

DESCRIPTION OF SYMBOLS 1 ... Lighting fixture (downlight), 2 ... Light emitting module, 3 ... Heat sink, 4 ... Light distribution member, 5, 7 ... Connection member, 23 ... Light emission part, 32 ... Blower mechanism, 41 ... first light distribution member, 41a ... reflection surface of first light distribution member, 42 ... second light distribution member, 42a ... second distribution Reflecting surface of optical member, 51... Side wall, 52.

Claims

A light emitting module having a light emitting element as a light source and having a light emitting portion from which light from the light source is emitted, and at least a part of the outer shell having thermal conductivity and thermally coupled to the light emitting element,
A heat sink provided on the back side of the light emitting module and thermally coupled to a part of the outer shell;
A light distribution member having a thermal conductivity having a reflection surface that surrounds the light emitting portion of the light emitting module and expands in the light irradiation direction;
A connection member for connecting the light distribution member and a part of the outer shell to transfer heat from the outer shell to the light distribution member;
The lighting fixture characterized by comprising.
The connecting member has a pair of side walls and a back wall connecting the side walls, and an attachment piece in surface contact with the light distribution member is extended from each of the walls. The lighting fixture according to claim 1.
The light distribution member includes a curved reflection surface that expands in the light irradiation direction. The reflection surface includes a reflection surface located on a light emitting portion side of the light emitting module and a light irradiation direction side. The curvature of the reflective surface located on the light emitting portion side is set to be larger than the curvature of the reflective surface located on the light irradiation direction side. The lighting fixture according to 1.
The lighting device according to claim 1, wherein the heat sink includes a blowing mechanism for blowing air toward the light distribution member.
A light emitting module having a light emitting element as a light source and having a light emitting portion from which light from the light source is emitted, and at least a part of the outer shell having thermal conductivity and thermally coupled to the light emitting element,
A heat sink provided on the back side of the light emitting module and thermally coupled to a part of the outer shell;
A light distribution member having a thermal conductivity having a reflection surface that surrounds the light emitting portion of the light emitting module and expands in the light irradiation direction;
A connecting member for connecting the light distribution member and the heat sink to transmit heat from the heat sink to the light distribution member;
The lighting fixture characterized by comprising.
The light distribution member includes a curved reflection surface that expands in the light irradiation direction. The reflection surface includes a reflection surface located on a light emitting portion side of the light emitting module and a light irradiation direction side. The curvature of the reflective surface located on the light emitting portion side is set to be larger than the curvature of the reflective surface located on the light irradiation direction side. 5. The lighting fixture according to 5.
The lighting device according to claim 5, wherein the heat sink includes a blowing mechanism for blowing air toward the light distribution member.