JP2012059475A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture capable of effectively radiating heat of both light-emitting elements, and a lighting device.SOLUTION: The lighting fixture includes a light source part 6 equipped with light-emitting elements and boards to mount these light-emitting elements, a heat-radiating member 3 including thermally coupling parts 32 thermally coupled with the light source parts 6, and a lighting device 2 equipped with a lighting device case 21 with thermal conductivity with one end side connected and thermally coupled with the thermally coupling parts 32 of the heat-radiating member 3, a circuit board 22 arranged at the lighting device case 21 separated from the one end side, and circuit components mounted on the circuit board 22 for controlling lighting of the light-emitting elements.

Description

  Embodiments described herein relate generally to a lighting fixture using a light emitting element such as an LED as a light source.

  Recently, along with the increase in output, efficiency, and widespread use of light emitting elements such as LEDs, lighting fixtures that can be expected to have a long life using light emitting elements as light sources have been developed.

As the temperature of a light emitting element such as an LED increases, the light output decreases and 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, various heat dissipation structures that suppress the temperature rise of the light emitting element are employed.
On the other hand, in a lighting device that controls lighting of a light emitting element, it is necessary to suppress a temperature rise in order to improve deterioration of the electronic components due to heat generation.

JP 2002-299695 A

However, in the conventional lighting fixture, the subject that the consideration for performing efficient heat dissipation of both a light emitting element and a lighting device is not made.
This invention is made | formed in view of the said subject, and it aims at providing the lighting fixture which can perform effective heat dissipation of both a light emitting element and a lighting device.

  A lighting fixture according to an embodiment of the present invention includes a light emitting element, a light source unit including a substrate on which the light emitting element is mounted, and a heat dissipation member having a thermal coupling unit thermally coupled to the light source unit. ing. In addition, a lighting device for controlling lighting of the light emitting element is provided.

  The lighting device includes a lighting device case, a circuit board, and a circuit component mounted on the circuit board. The lighting device case has thermal conductivity, and is thermally coupled with one end connected to the thermal coupling portion of the heat radiating member. The circuit board is disposed in the lighting device case so as to be separated from the one end side.

  According to the embodiment of the present invention, it is possible to provide a lighting fixture capable of effectively radiating heat of both the light emitting element and the lighting device.

It is a perspective view which shows the lighting fixture which concerns on the 1st Embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the same lighting fixture. It is a perspective view which shows the same instrument main body seen from the back side, and has simplified and showed the lighting device and its wiring connection relationship. FIG. 4 is a cross-sectional view taken along line XX in FIG. 3. It is an enlarged view which shows the A section in FIG. It is an enlarged view which shows the B section in FIG. It is a perspective view which shows the lighting device of the lighting fixture. It is sectional drawing which shows the attachment state to the ceiling surface of the lighting fixture. Similarly, it is sectional drawing which shows the attachment state to the ceiling surface of a lighting fixture. It is an enlarged view equivalent to FIG. 5 which shows the lighting fixture which concerns on the 2nd Embodiment of this invention.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In each drawing, the wiring connection relationship using lead wires or the like may be omitted. In addition, in FIG. 3, the lighting device and its wiring connection relation are shown in a simplified manner. Moreover, the same code | symbol is attached | subjected to the same part and the overlapping description is abbreviate | omitted.

  The lighting fixture of this embodiment is a type used by being attached to a hanging ceiling body installed on the fixture mounting surface, and for example, lighting a room using a light guide plate.

  1 to 4, the lighting fixture includes an adapter A (FIG. 2 and FIG. 2) that is electrically and mechanically connected to the fixture body 1 and a hooking sealing body Cb installed on the ceiling surface C as the fixture mounting surface. 8) and an infrared remote control transmitter R. As shown in FIG. 1, the instrument body 1 is formed in a substantially square appearance, and the front side is a light irradiation surface and the back side is a mounting surface to the ceiling surface C.

  As representatively shown in FIG. 2, the instrument body 1 includes a lighting device 2, a reflector plate 3, a chassis 4, an adapter guide 5, a light source unit 6, a light guide plate 7, an auxiliary component unit 8, A main body frame 9 and a cover member 10 are provided. These components will be described sequentially.

  As described with reference to FIG. 7, the lighting device 2 includes a case 21 made of metal such as aluminum having thermal conductivity, a circuit board 22 attached to and accommodated in the case 21, and the circuit board. 22 and a circuit component 23 mounted on the circuit board 22. The case 21 is formed in a thin box shape having a substantially rectangular parallelepiped shape. On one long side and one short side, a bowl-shaped connection portion 21a extending outward along the side is formed. ing. Moreover, the attachment tongue piece 21b is extended and formed in the long side which opposes one long side.

  The circuit board 22 is made of an insulating material such as glass epoxy resin, and is formed in a substantially rectangular plate shape. On the surface side, circuit components 23 such as a control IC, a capacitor, a winding component, and a resistance element are mounted. ing. Further, a power connector 23 a connected to the power source side, a load connecting connector 23 b for connecting the light source unit 6, and a harness 23 c for connecting the auxiliary component unit 8 are provided. Furthermore, components having relatively small height dimensions such as switching elements and surface mount components are mounted on the back surface side of the circuit board 22.

  As representatively shown in FIG. 5, such a circuit board 22 is attached to the case 21 by a resin fixture 22a with the front side facing down in the drawing. The resin fixture 22 a is arranged so that the tip protrudes from the back side of the case 21 to the front side, and this is press-fitted into an attachment hole formed in the circuit board 22. As shown in FIGS. 3 and 4, the case 21 is formed larger than the circuit board 22, and when the circuit board 22 is attached, the circuit board 22 is arranged away from the hook-shaped connection portion 21 a. It is like that.

  The lighting device 2 as described above is connected to the commercial AC power source through the adapter A, with the adapter A side being electrically connected to the power connector 23a. Therefore, the lighting device 2 receives this AC power supply, generates a DC output, supplies the DC output to the light emitting element 61 via the load connecting connector 23b and the lead wire, and controls the lighting of the light emitting element 61. It has become. The lighting device 2 is mounted on the back side of the reflector 3 (refer mainly to FIG. 3).

  The reflection plate 3 also serves as a heat radiating member and functions as a heat radiating member. The reflection plate 3 is formed in a substantially square shape from a metal material such as aluminum having thermal conductivity, and has a square shallow dish-shaped recess 31, and extends outward on each side of the recess 31. A mounting piece 32 is formed. Further, the front side of the recess 31 is configured as a reflecting surface, and a rectangular opening 33 is formed in a substantially central portion. Note that the mounting piece 32 serves as a thermal coupling portion that is thermally coupled to the light source unit 6 as described later.

  The chassis 4 is formed in a substantially rectangular parallelepiped box shape from a metal material such as a cold-rolled steel plate, and one end side (the lower side in the drawing) is opened. A hook-shaped contact portion 41 extending in the direction is formed. A circular opening 52 is formed on the other end side (upper side in the drawing). Therefore, the chassis 4 has a substantially cylindrical shape with a low height as a whole. The contact portion 41 is a portion that contacts the back side of the light guide plate 7, and the opening 42 is a portion through which the adapter A is inserted. And as shown in FIG. 5, it arrange | positions so that the peripheral part of the opening 33 in the reflecting plate 3 may overlap | superpose on the upper surface side of the contact part 41 of the chassis 4, and this is fixed by welding etc. As shown in FIG. The contact portion 41 of the chassis 4 has a function of reinforcing the light guide plate 7.

  As shown with reference to FIG. 5, the adapter guide 5 is formed in a substantially octagonal prism shape, and is provided with an engaging port 51 through which the adapter A is inserted and engaged at the center, and is provided at the lower end side. A flange portion 52 is formed toward the direction. The adapter guide 5 is disposed and attached such that the outer peripheral surface thereof is in contact with the inner peripheral surface of the chassis 4.

  As shown in FIGS. 2, 4, and 6, the light source unit 6 includes a substrate 62 on which a light emitting element 61 that is a light source is mounted, and a mounting plate 63 as a mounting member to which the substrate 62 is mounted. Yes.

  The substrate 62 is formed in a horizontally long rectangular shape, and is formed of a glass epoxy resin flat plate as an insulating material. A wiring pattern formed of copper foil is applied to the surface side. Further, a resist layer is appropriately applied. Note that when the material of the substrate 62 is an insulating material, a ceramic material or a synthetic resin material can be applied. Furthermore, when it is made of metal, a metal base substrate in which an insulating layer is laminated on one surface of a base plate having good thermal conductivity such as aluminum and excellent heat dissipation may be applied.

  The light emitting element 61 is an LED, which is a surface mount type LED package. A plurality of, specifically, 15 LED packages are arranged and arranged in a straight line along the longitudinal direction of the substrate 62. The LED package is generally composed of an LED chip disposed in a main body formed of ceramics, and a translucent resin for molding such as an epoxy resin or a silicone resin that seals the LED chip. Yes.

  The LED chip is a blue LED chip that emits blue light. In the translucent resin, a phosphor is mixed, and in order to be able to emit white light, a yellow phosphor that emits yellow light that is complementary to blue light is used. Yes.

  In addition, LED may be made to mount an LED chip directly on the board | substrate 62, and you may make it mount a bullet-type LED, and a mounting system and a format are not exceptionally limited.

The mounting plate 63 is made of a material having good heat conduction, such as aluminum or galvanized steel plate, and is horizontally long and has a substantially C-shaped channel shape. On the inner side wall of the mounting plate 63, two substrates 62 are mounted side by side in the longitudinal direction so that the back surfaces thereof are in close contact by screwing or the like. Therefore, the light source unit 6 is unitized by attaching two substrates 62 to one mounting plate 63.
In the present embodiment, as shown mainly in FIG. 2, four unitized light source sections 6 are used and arranged corresponding to each side of the light guide plate 7.

The light guide plate 7 is formed in a rectangular flat plate shape using a material having high transmittance such as acrylic resin, and a dot pattern composed of a large number of white reflective dots that diffuse light is formed on the back side by printing. Yes. Further, a substantially octagonal opening 71 is formed at a substantially central portion of the light guide plate 7 so as to correspond to the outer shape of the adapter guide 5 and to correspond to the adapter A. The substantially octagonal opening 71 is originally formed as a shape with chamfered square corners. Further, each side of the rectangular shape that is the outer peripheral portion of the light guide plate 7, that is, the side end surface, functions as a light incident end surface 72 through which light emitted from the light emitting element 61 is incident and travels in the light guide plate 7. It has become. And the light-guide plate 7 is comprised as a light emission part which has a planar light emission area | region in the front side.
In addition, what provided the reflective sheet in the back side, and what provided the diffusion sheet in the front side are applicable to the light-guide plate 7 suitably.

  As shown in FIGS. 6 and 7, the auxiliary component unit 8 includes a unit board 82 and a plurality of electrical auxiliary parts mounted on the board 82 in a horizontally long box-like case 81. The electrical auxiliary components in the present embodiment are an infrared remote control signal receiver 84, an illuminance sensor 85, a nightlight 86 as an auxiliary light source, a switch 87, a monitor lamp 88, and the like.

  The auxiliary component unit 8 is disposed on the outer peripheral edge of the lighting fixture, that is, the fixture main body 1, specifically, on one side of the main body frame 9. Accordingly, the light guide plate 7 is disposed outside the light emitting region.

  The auxiliary component unit 8 configured as described above is provided with a plurality of electric auxiliary components in a centralized manner, fitted into an opening formed in the main body frame 9, and the flange 81b1 of the case cover 81b is locked. Then, it is attached to the main body frame 9 by fixing means (not shown).

  The main body frame 9 is made of a synthetic resin such as ABS resin or polycarbonate, has a substantially square shape and is formed in a frame shape larger than the dimension of the light guide plate 7, and includes a side wall 91 and a lower end of the side wall 91. A bottom wall 92 having an inclined portion extending inward from the portion and rising obliquely. A plurality of bosses 93 are erected on the bottom wall 92, and the attachment pieces 32 of the reflector 3 are screwed to the bosses 93. Further, as described above, the bottom wall 92 corresponding to one side of the square shape is formed with an opening portion into which the auxiliary component unit 8 is fitted.

  The cover member 10 is formed in a substantially square shape from a synthetic resin material having a milky white color such as an acrylic resin or polycarbonate, and is detachably attached to the adapter guide 5 by an engagement / disengagement means (not shown). Therefore, when the cover member 10 is attached, the adapter A is covered and can be made difficult to visually recognize from below.

  2 and 8, the adapter A is electrically and mechanically connected to a hooking sealing body Cb installed on the ceiling surface C by a hooking blade provided on the upper surface side. A pair of locking portions A1 are provided on both sides of the peripheral wall so as to always protrude to the outer peripheral side by a built-in spring. The locking portion A1 is immersed by operating a lever provided on the lower surface side. Further, a power cord (not shown) connected to the lighting device 2 is led out from the adapter A, and is connected to the lighting device 2 via a connector.

  The infrared remote control transmitter R transmits, for example, a specific coded infrared remote control signal in the form of a pulse with a frequency of 38 kHz. For example, an all-light button, a dimming button, a nightlight button, an off button, etc. Is provided. By operating the remote control transmitter R toward the auxiliary component unit 8, that is, the infrared remote control signal receiving unit 84, the light emission state of the light emitting element 61 in the light source unit 6, that is, all-light lighting, dimming lighting, extinction, etc. Control can be performed.

  In the lighting fixture as described above, as shown in FIG. 5, the contact portion 41 of the chassis 4 is in contact with the back side of the light guide plate 7. More specifically, the contact portion 41 of the chassis 4 is disposed on and in contact with the periphery of the opening 71 on the back side of the light guide plate 7. The contact of the contact portion 41 of the chassis 4 with the back side of the light guide plate 7 may be performed directly or indirectly.

  As shown in FIGS. 3 to 6, the reflection plate 3 as a heat radiating member is disposed on the back side of the light guide plate 7 and is screwed and attached to a plurality of bosses 93 of the main body frame 9. In this state, the mounting piece 32 of the reflecting plate 3 is brought into surface contact with the upper surface of the mounting plate 63 in the light source unit 6 and is thermally coupled. Therefore, the mounting piece 32 is a thermal coupling portion between the light source unit 6 and the reflection plate 3.

  Furthermore, one end side of the lighting device 2, that is, the connection portion 21 a in the case 21 is connected to an attachment piece 32 that is a thermal coupling portion of the reflector 3. Specifically, as shown in FIG. 6, the connection portion 21 a of the case 21 is disposed in surface contact so as to overlap the attachment piece 32 of the reflector 3, and penetrates the connection portion 21 a and the attachment piece 32. They are connected by mounting screws that are screwed into the upper surface wall of the mounting plate 63 and are thermally coupled. Further, the mounting tongue 21 b of the case 21 is fixed to the upper surface of the chassis 4.

  In such a mounted state of the lighting device 2, the circuit board 22 is arranged apart from the connection portion 21 a in the case 21 as mainly shown in FIG. 3. In addition, while the circuit board 22 is separated from the connection portion 21a, the wiring length of the lighting device 2 and the wiring L1 on the power source side, the wiring L2 between the load side (light source unit 6), and the wiring L3 with the auxiliary component unit 8 becomes short. The circuit board 22 is preferably arranged as described above. Furthermore, the connection between the circuit board 22 and the load side is concentrated at one place by the load connecting connector 23b. As a result, electrical noise can be reduced.

  For example, when two types of light emitting elements 61, white and light bulb color, are used to switch between these to obtain illumination light having different light colors, two lines of wiring are required as a load. It is possible to reduce electrical noise by concentrating at one place by the connector 23b.

  Further, the peripheral edge portion on the front surface side of the opening 71 in the light guide plate 7 is supported by the flange portion 52 on the lower end side of the adapter guide 5. Further, as representatively shown in FIG. 6, the outer peripheral edge portion on the front surface side of the light guide plate 7 is supported by the inclined portion of the bottom wall 92 in the main body frame 9. On the other hand, the reflection plate 3 is disposed on the back side of the light guide plate 7 as described above. The light guide plate 7 includes the reflection plate 3, the flange portion 52 of the adapter guide 5, and the bottom wall of the main body frame 9. It arrange | positions so that it may be pinched | interposed by 92 inclined-shaped parts. In this state, the light incident end surface 72 of the light guide plate 7 is positioned to face the light emitting element 61 so that light emitted from the light emitting element 61 is incident thereon.

  As shown in FIGS. 1, 2, and 4, the auxiliary component unit 8 is disposed outside the light emitting region of the light guide plate 7 as a light emitting unit and at the outer peripheral edge. Therefore, it can be avoided that the auxiliary component unit 8, that is, the auxiliary component forms a dark portion on the light guide plate 7. In addition, since the auxiliary component unit 8 is provided with a plurality of electrical auxiliary components such as the infrared remote control signal receiving unit 84 in a centralized manner, wiring processing and assembly work can be made more efficient. Furthermore, since it is arrange | positioned in an outer periphery part, the improvement of design property can be anticipated without being conspicuous.

  As shown in FIGS. 3, 4, and 6, a gap G is formed between the side wall 91 of the main body frame 9 and the mounting piece 32 of the reflecting plate 3. That is, the outer shape of the reflecting plate 3 is smaller than the frame-shaped main body frame 9, and the gap G is formed over the entire circumference of the reflecting plate 3. The heat generated from the light emitting element 61 by the gap G is radiated by the convection action through the mounting plate 63 and the mounting piece 32 of the reflecting plate 3. In order to promote this convection action, an air circulation hole may be formed in the bottom wall 92 of the main body frame 9.

  Next, the attachment state to the ceiling surface C of a lighting fixture is demonstrated with reference to FIG.8 and FIG.9. In addition, illustration of the power cord derived | led-out from the adapter A is abbreviate | omitted in each figure.

  As shown in FIG. 8, the hanging ceiling body Cb is installed on the ceiling surface C. The adapter A is electrically and mechanically connected to the hooking sealing body Cb. From this state, as shown by the arrow in the figure, until the engaging portion 51 of the adapter A is engaged with the engaging port 51 of the adapter guide 5 while the engaging port 51 of the adapter guide 5 in the instrument main body 1 is aligned with the adapter A. The instrument body 1 is pushed up from below by hand to perform the mounting operation.

  As shown in FIG. 9, in the mounting state of the instrument body 1, the adapter A is inserted through the opening 52 of the chassis 4, and the locking portion A <b> 1 of the adapter A is locked to the engaging port 51 of the adapter guide 5. Retained.

  Further, when removing the instrument main body 1, it can be removed by removing the cover member 10 and operating the lever provided on the adapter A to disengage the engaging portion A 1 of the adapter A.

  When electric power is supplied to the lighting device 2 in the mounted state of the lighting fixture, the light emitting element 61 is energized through the substrate 62, and each light emitting element 61 is lit. The light emitted from the light emitting element 61 enters the light incident end surface 72 of the light guide plate 7, and the incident light is totally reflected within the light guide plate 7 and spreads over the entire light guide plate 7, and is formed on the back side. The light diffused and reflected by the dot pattern composed of the reflective dots is radiated from the light emitting region on the front side. In addition, a part of the light leaking from the light guide plate 7 is reflected by the reflecting plate 3 and radiated to the front side to be reused.

  Further, by operating the infrared remote control transmitter R toward the infrared remote control signal receiving unit 84, the light emission state of the light emitting element 61 in the light source unit 6 can be controlled.

  During the lighting of the light emitting element 61, heat is generated. The heat generated from each light emitting element 61 is conducted from the back side of the substrate 62 to the mounting plate 63, and the heat conducted to the mounting plate 63 is further attached to the mounting piece 32 (thermal coupling portion) in the reflecting plate 3 as a heat radiating member. ) And is effectively dissipated over a wide area of the reflector 3. In addition, the heat is conducted to the connection portion 21 a in the case 21 of the lighting device 2 connected to the attachment piece 32, and is transmitted to the case 21 to be radiated. Therefore, the heat from the light source unit 6 is conducted to both the reflector 3 and the case 21 and efficiently radiated. These heat dissipations increase the overall heat dissipation effect.

  On the other hand, the circuit board 23 on which the circuit component 22 is mounted is disposed away from the connection portion 21a of the case 21. For this reason, the circuit board 23 radiates heat by a convection action or the like in a situation where the thermal influence from the light source unit 6 is reduced.

  Thus, by using the case 21 of the lighting device 2 and arranging the circuit board 23 at a suitable position, it is possible to effectively dissipate heat from both the light source unit 6 and the lighting device 2. Further, since the gap G is formed between the main body frame 9 and the reflection plate 3, heat dissipation of the light source unit 6 and the attachment piece 32 of the reflection plate 3 is promoted by convection action.

As described above, according to the present embodiment, both the light source unit 6, that is, the light emitting element 61 and the lighting device 2 can be effectively dissipated, and the temperature rise can be effectively suppressed.
Next, a second 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 1st Embodiment, or an equivalent part, and the overlapping description is abbreviate | omitted.

In the present embodiment, the heat conductive material 23t is interposed between the head side of the circuit component 23 having a relatively large height mounted on the surface side of the circuit board 22 and the reflecting plate 3. . That is, the heat conductive material 23t is interposed between the reflection plate 3 and the head side opposite to the mounting side mounted on the circuit board 22 of the circuit component 23. For example, silicone resin or the like can be applied to the heat conducting member 23t.
Therefore, the heat generated from the circuit component 23 can be efficiently conducted to the reflector 3 through the heat conductive material 23t, and the heat dissipation of the circuit component 23 can be improved.

  The circuit board 22 and the case 21 or the reflector 3 of the lighting device 2 are connected by a heat conductive member so that heat from the circuit board 22 is conducted to the case 21 and the reflector 3 to be radiated. Good.

  In addition, this invention is not limited to the structure of the said embodiment, A various deformation | transformation is possible in the range which does not deviate from the summary of invention. In the above embodiment, four unitized light source units are used and disposed corresponding to each side of the light guide plate. For example, two light source units are used and adjacent to each other. You may make it arrange | position corresponding to two sides. Furthermore, the light source unit may be arranged corresponding to only one side of the light guide plate or two opposite sides, and the arrangement of the light source unit is not particularly limited. It can be appropriately selected according to the design.

Moreover, in the said embodiment, although the thing of the format which illuminates the light radiate | emitted from a light emitting element using a light-guide plate was demonstrated, it is not restricted to this format. For example, the present invention can be applied to a type in which light emitted from a light-emitting element mounted on a substrate is transmitted through a translucent cover having a diffusibility and illuminated.
Furthermore, solid state light emitting elements, such as LED and organic EL, are applicable to a light emitting element. Furthermore, the number of light emitting elements is not particularly limited.

DESCRIPTION OF SYMBOLS 1 ... Appliance main body, 2 ... Lighting device, 3 ... Heat conduction member (reflector),
4 ... chassis, 6 ... light source, 7 ... light guide plate, 8 ... auxiliary component unit,
9 ... body frame, 10 ... cover member, 21 ... lighting device case,
22 ... circuit board, 23 ... circuit component, 23t ... heat conduction material,
32... Thermal coupling part (mounting piece), 61... Light emitting element, 62.
63 ... Mounting member (mounting plate), 72 ... Light incident end surface,

Claims (2)

A light-emitting element and a light source unit including a substrate on which the light-emitting element is mounted;
A heat dissipating member having a thermal coupling part thermally coupled to the light source part;
A lighting device case having thermal conductivity in which one end side is connected to the thermal coupling portion of the heat radiating member and thermally coupled thereto, and a circuit board disposed in the lighting device case so as to be separated from the one end side; A lighting device comprising: a circuit component mounted on the circuit board; and lighting control of the light emitting element;
The lighting fixture characterized by comprising.   The lighting apparatus according to claim 1, wherein a heat conductive material is interposed between the heat radiation member and the head side opposite to the mounting side mounted on the circuit board of the circuit component. .

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