JP2009129859A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire diversifiable as a product, which can improve merchantability, and can effectively suppress a temperature rise of a board with light-emitting elements arranged thereon. <P>SOLUTION: The luminaire 1 includes: light source units 3 each equipped with the board 4 with the light-emitting elements 6 arranged thereon, and a thermally-conductive ornamental cover 5 structured to surround the board 4; and a thermally-conductive base 2 where the plurality of light source units 3 are arranged by being spaced apart from each other to form heat radiation passages 10. The boards 4 and the ornamental covers 5 of the light source units 3 are thermally connected to one another. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lighting fixture using a light emitting element such as an LED.

A light emitting element such as an LED affects the life as well as the light output as the temperature rises. For this reason, in the lighting fixture which uses solid light emitting elements, such as LED and an EL element, as a light source, in order to improve various characteristics of a lifetime and efficiency, it is necessary to suppress the temperature rise of a light emitting element. Conventionally, in this kind of lighting fixture, a plurality of LEDs are gathered and arranged on the base, and a large number of through holes are formed in the base so that each LED is sufficiently radiated and temperature rise is suppressed. The thing is proposed (refer patent document 1).
JP 2004-95655 A

  However, although Patent Document 1 discloses a configuration that dissipates heat from an LED and suppresses temperature rise, it is satisfactory in appearance, function, etc. to commercialize this form as a lighting fixture. is not.

  The present invention has been made in view of the above circumstances, and since the light source unit is independently configured and the plurality of light source units are arranged on the base, diversification as a product is possible, and the merchantability is improved. It is an object of the present invention to provide a lighting fixture that can be improved and that can effectively suppress the temperature rise of the substrate on which the light emitting element is provided.

The lighting apparatus according to claim 1, wherein the light source unit includes a substrate on which the light emitting element is disposed, and a thermally conductive decorative cover configured to surround the substrate; And a heat-conductive base that is thermally coupled to the substrate of the light source unit and the decorative cover.

  In the present invention and the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified. The light emitting element is an LED, an organic EL, or the like. The light emitting element is preferably disposed by a chip-on-board method or a surface mounting method. However, due to the nature of the present invention, the disposition method is not particularly limited. For example, a bullet-type LED is used. May be disposed on the substrate. Further, there is no particular limitation on the number of light emitting elements. Surrounding the board includes, for example, covering the side of the board so that it is difficult to visually recognize from the outside when the lighting fixture is used. This is the main purpose. The fact that the substrate and the decorative cover are thermally bonded allows not only the substrate and the decorative cover to be in direct contact with the base, but also indirectly. For example, a member having good thermal conductivity or an adhesive may be interposed between the substrate and the base.

  The lighting fixture according to claim 2 is characterized in that in the lighting fixture according to claim 1, heat dissipating fins are provided on the outer peripheral surface of the decorative cover. The radiating fin increases the surface area of the outer peripheral surface of the decorative cover, and is not limited to a shape such as a fin, a flat plate, or a chevron, but may be formed so as to protrude, and the shape is not limited.

  The lighting fixture according to claim 3 is the lighting fixture according to claim 2, wherein the radiating fin has a groove formed in a horizontal direction with respect to a base surface.

  According to a fourth aspect of the present invention, there is provided the lighting fixture according to the second aspect, wherein the radiating fin has a groove formed in a direction perpendicular to the base surface.

  According to the present invention, there is provided a lighting fixture that can be diversified as a product, can improve the merchantability, and can effectively suppress the temperature rise of the substrate on which the light emitting element is disposed. It becomes possible.

  Hereinafter, a first embodiment of a lighting fixture of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view showing a lighting fixture, FIG. 2 is a perspective view showing a light source unit, FIG. 3 is a plan view thereof, and FIG. 4 is a side view showing a cross section of the same portion (left half). In FIG. 1, this lighting fixture is a so-called base lighting fixture 1 that is used by being attached to a ceiling surface. The base lighting fixture 1 includes a base 2 and a plurality of light source units 3... Disposed on the base 2. The base 2 is made of aluminum and is formed in a substantially square flat plate shape having a side of about 250 mm. The light source unit 3 has an almost rectangular parallelepiped shape with a length and width of about 70 mm and a height of about 25 mm, and a total of 9 pieces of 3 vertical x 3 horizontal on the surface of the base 2 at a predetermined interval (about 10 mm). Are arranged in a matrix. The material of the base 2 is not limited to aluminum, and a metal material or a resin material with good thermal conductivity can be used.

  Next, in FIG. 2 to FIG. 4, the light source unit 3 includes a printed circuit board 4 on which a light emitting element serving as a light source is disposed, and a decorative cover 5. Here, the light emitting elements are LED chips 6... Which are mounted on the printed circuit board 4 by a chip-on-board method. That is, five LED chips 6... Are arranged on the surface of the printed circuit board 4 at a predetermined interval, and a coating material is applied to the surface. In addition, what is necessary is just to determine suitably the arrangement | positioning number of LED chip 6 ... according to goods specification and design. The printed circuit board 4 is a substantially square flat plate made of metal or insulating material. When the substrate 4 is made of metal, it is preferable to use a material having good thermal conductivity such as aluminum and excellent heat dissipation. In the case of an insulating material, a ceramic material or a synthetic resin material having relatively good heat dissipation characteristics and excellent durability can be applied. When a synthetic resin material is used, it can be formed of, for example, a glass epoxy resin. The substrate 4 is screwed to the surface of the base 2 with its back surface being in surface contact.

  The decorative cover 5 constitutes the external appearance of the light source unit 3, is made of aluminum, is a substantially rectangular parallelepiped, and has a cylindrical shape. On the entire circumference of the outer peripheral surface 5a of the decorative cover 5, radiating fins 7 are integrally formed to increase the radiating area. The heat radiating fins 7 are formed in the horizontal direction, that is, in the horizontal direction with respect to the surface of the base 2, and thus form grooves 7 a in the direction. On the other hand, the inner peripheral surface 5b of the decorative cover 5 has an inclined shape expanding in the direction of the irradiation opening 5c, and a reflecting plate 8 is attached to the inner peripheral surface 5b along the inclined shape. The reflecting plate 8 is made of ABS resin, and chrome plating is applied to the reflecting surface of the surface in order to increase the reflection efficiency. Further, a louver 9 configured in a lattice shape is attached to the base portion 8a of the reflecting plate 8. The louver 9 efficiently controls light emitted from the LED chips 6... In a desired direction and prevents glare. The material of the decorative cover 5 is not limited to aluminum, and a metal material or a resin material having good thermal conductivity may be used.

  The decorative cover 5 configured as described above is attached to the base 2 by screwing from the back side of the base 2 in a surface contact state. In this state, the decorative cover 5 covers the substrate 4 so as to make it difficult to see the side periphery 4a of the substrate 4 from the outside and to improve the appearance design of the light source unit 3. Yes. Further, five LED chips 6... Are positioned corresponding to the grids of the lattice-like louver 9. Therefore, the louver 9 does not become an obstacle to the emitted light of the LED chips 6. The heat dissipating fins may be formed separately from the decorative cover 5 and attached to the decorative cover 5 in a heat conductive manner.

  Further, a lighting circuit (not shown) is provided on the surface side of the printed circuit board 4 where the LED chips 6. The lighting circuit lights the LED chip 6, and components such as a capacitor and a switching element are mounted on the substrate of the lighting circuit.

  The operation of the base lighting fixture 1 configured as described above will be described. When the lighting apparatus 1 is energized, the lighting circuit operates to supply power to the substrate 4 of each light source unit 3, and the LED chips 6 ... emit light. Most of the light emitted from the LED chips 6... Is directly irradiated forward from the irradiation opening 5 c, and a part of the light is reflected by the reflecting surface of the reflecting plate 8 and irradiated forward. On the other hand, the heat generated from the LED chips 6... Is mainly transmitted from almost the entire back surface of the substrate 4 to the base 2 having a large heat radiation area. Further, the heat of the base 2 is conducted to the decorative cover 5 through the surface contact portion with the decorative cover 5 and is radiated. Since the heat dissipating fins 7... That increase the surface area of the outer peripheral surface of the decorative cover 5 are formed, heat is also efficiently dissipated here. Thus, each member is thermally coupled, and the temperature rise of the substrate 4 can be suppressed by the heat conduction path and heat dissipation. In addition, heat generated from the lighting circuit is also conducted to the base 2 to be dissipated.

  While each light source unit 3 radiates heat as described above, each light source unit 3 is disposed at a predetermined interval from each other, and thus this interval is communicated to form the heat radiation flow passage 10. (See FIG. 1). Specifically, the intervals between the decorative covers 5 are in a grid-like communication state to form the heat radiation flow passage 10. Therefore, not only the heat radiation of the individual light source units 3 but also the heat radiation flow passage 10 promotes the flow of the heat radiation air flow along the flow passage 10, thereby further enhancing the heat radiation effect. Further, since the heat radiating fins 7 are formed in the horizontal direction with respect to the surface of the base 2, the flow of the heat radiating air current is also promoted by this configuration.

  As described above, according to the present embodiment, the light source unit 3 is configured independently, and the plurality of light source units 3 are disposed on the base 2, so that the light source unit 3 can be shared. It is also possible to prepare several types of bases 2 of different sizes, change the number of light source units 3 corresponding to these bases 2 and configure them according to the application, so that various types and diversification can be achieved. Yes, it can be expected to improve merchantability. Moreover, the temperature rise of the board | substrate 4 with which the light emitting element was arrange | positioned can be effectively suppressed by the skillful structure from both sides of the structure of the light source unit 3 and the method of arrangement | positioning of the light source unit 3 to the base 2. This makes it possible to arrange a large number of light source units 3 on the base 2, so that it is easy to realize a high-output lighting fixture.

  Next, a second embodiment of the light source unit according to the present invention will be described with reference to FIGS. (Embodiment 1) FIG. 5 is a perspective view showing a light source unit as in FIG. The same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. In this embodiment, the radiating fins 7-2... Are integrally formed in the vertical direction with respect to the entire circumference of the outer peripheral surface 5a of the decorative cover 5, that is, perpendicular to the surface of the base 2. Therefore, grooves 7a-2 ... are formed in the direction. This form can also increase the heat radiation area, and can achieve the same effects as those of the first embodiment. Moreover, since the radiation fins 7-2... Act efficiently on the convection from the irradiation opening 5c side to the base 2 side generated around the light source unit 3, the heat radiation effect can be further enhanced.

  (Embodiment 2) FIG. 6 is a perspective view showing a part of a light source unit. The same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. In this embodiment, the radiating fins 7-2,... Are integrally formed in the vertical direction with respect to the surface of the base 2 on the entire circumference of the outer peripheral surface 5a of the decorative cover 5. This is the same as the first embodiment, but the vertical grooves 7 a-3... Are grooves that penetrate from the irradiation opening 5 c toward the base 2. Therefore, in addition to the effect of the first embodiment, the heat radiation fins 7-2 and the penetrating grooves 7a-3 and so on act on the convection from the irradiation opening 5c side to the base 2 side efficiently. It can be expected to further enhance the heat dissipation effect.

  Next, a third embodiment of the light source unit according to the present invention will be described with reference to FIG. FIG. 7 is a side view showing a cross section of a part (left half) of the light source unit as in FIG. The same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. In the present embodiment, the decorative cover 5-1 is configured in a bottomed cylindrical shape, and includes a bottom wall 5-1a. Therefore, the substrate 4 is screwed to the base 2 through the bottom wall 5-1a. In addition, you may make it fix the board | substrate 4 by adhere | attaching or screwing directly to the bottom wall 5-1a, without screwing to the base 2. FIG.

  With such a configuration, heat generated from the LED chips 6... Is mainly transmitted from almost the entire back surface of the substrate 4 to the base 2 having a large heat radiation area via the bottom wall 5-1a of the decorative cover 5-1. At the same time, heat is directly transferred from the bottom wall 5-1a of the decorative cover 5-1 to the heat radiating fins 7. Further, the heat of the base 2 is conducted to the decorative cover 5 via the surface contact portion with the decorative cover 5 and is efficiently radiated by the heat radiating fins 7. According to the present embodiment, the same effects as those of the first embodiment described above can be achieved.

  In each of the embodiments described above, a translucent cover may be provided in the irradiation opening of the decorative cover. In addition, the radiating fins may be formed in a horizontal, vertical or oblique direction with respect to the base surface, and may be formed in a step shape, and is not limited to the forming direction and shape.

It is a perspective view which shows 1st Embodiment of the lighting fixture of this invention. It is a perspective view which shows the light source unit. It is a top view which shows the light source unit. It is a side view which shows a part of the light source unit in section. It is a perspective view which shows 2nd Embodiment (Example 1) of the light source unit concerning this invention. It is a perspective view which shows a part of 2nd Embodiment (Example 2) of the light source unit concerning this invention. It is a side view which shows and shows a part of 3rd Embodiment of the light source unit concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lighting fixture, 2 ... Base, 3 ... Light source unit, 4 ... Board | substrate,
5 ... Cosmetic cover, 6 ... Light emitting element (LED chip), 7 ... Radiation fin,
10 ... Radiation flow passage

Claims (4)

A light source unit comprising a substrate on which the light emitting element is disposed, and a thermally conductive decorative cover configured to surround the substrate;
A plurality of the light source units disposed so as to be spaced apart from each other to form a heat radiation flow path, and a heat conductive base to which a substrate and a decorative cover of the light source unit are thermally coupled;
The lighting fixture characterized by comprising.   The lighting fixture according to claim 1, wherein a heat radiating fin is provided on an outer peripheral surface of the decorative cover.   The lighting fixture according to claim 2, wherein the radiating fin has a groove formed in a horizontal direction with respect to a base surface.   The lighting fixture according to claim 2, wherein the radiating fin has a groove formed in a direction perpendicular to the base surface.

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