JP2013026075A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture capable of emitting light uniformly from the whole light-emitting surface.SOLUTION: The lighting fixture 1 includes a case 2 of the fixture, an installation part 3 of the fixture arranged at the center of the case 2, a plurality of light sources 4 arranged at the surrounding of the installation part 3, and a first reflecting plate 5 arranged closer to the center of the case 2 than the light source 4 at the surrounding of the light source 4. The first reflecting plate 5 has a light transmission part 5a at one part, reflects light emitted from the light source 4 to the inner surface of the case 2 and the periphery direction of the lighting fixture 1 by the first reflecting plate 5, and makes the light transmitted from the light transmission part 5a proceed to the center of light irradiation direction. With this structure, since the light transmitted from the light transmission part 5a of the first reflecting plate 5 is emitted to the center of the light irradiation direction where the installation part 3 is located, the emission light from the light source 4 can be uniformly emitted from the whole of the lighting fixture 1.

Description

  The present invention relates to a lighting fixture that uniformly emits light emitted from a light source.

  In recent years, lighting fixtures using LEDs as light sources are used not only as local lighting fixtures such as spotlights and downlights, but also as main lighting fixtures that illuminate the entire room such as base lights and ceiling lights. Among main lighting fixtures, ceiling lights are often used in general households, and can be easily connected to the power supply unit installed on the ceiling so that the user can easily install them. Required.

  This type of ceiling light is shown in FIGS. 6 (a) and 6 (b). The ceiling light 101 includes a light source 102 using an LED, a lens 103 that controls light distribution of light emitted from the light source 102, a casing 104 that covers the upper part thereof, and a light diffusion cover 105 that diffuses light. . Further, the ceiling light 101 includes an attachment portion 107 for fixing the ceiling light 106 to the center portion thereof, and an attachment portion cover 108 for protecting the attachment portion 107.

  The light source 102 is disposed in the vicinity of the center of the ceiling light 101 with its light emitting surface facing the peripheral edge of the ceiling light 101. The lens 103 totally reflects the emitted light from the light source 102 on the inner surface of the outer wall of the lens and irradiates the peripheral portion of the light diffusion cover 105, and diffuses the emitted light from the light source 102 with a convex lens at the center of the lens. The body 104 or the light diffusion cover 105 is irradiated. The inner surface of the housing 104 is a reflecting surface, and reflects light from the lens 103 toward the light diffusion cover 105 side. The light diffusion cover 105 diffuses the light transmitted through the lens 103 and the light reflected from the inner surface of the housing 104.

  When the attachment portion 107 is fixed to the ceiling material 106, the attachment portion 107 is electrically connected to a power supply portion provided on the ceiling material 106 side, and power is supplied to a circuit for causing the light source 102 to emit light. The mounting portion 107 facilitates the installation of the ceiling light 101.

  However, since the ceiling light 101 is configured to simplify workability as described above, the emitted light from the light source 102 reaches the attachment portion 107 and the attachment portion cover 108 covering the attachment portion 107. It has a difficult structure. Therefore, it is impossible to irradiate light to the central portion of the ceiling light 101, and the position immediately below the ceiling light 101 becomes dark at the time of lighting, and the central portion of the ceiling light 101 looks dark and looks bad.

  On the other hand, there is a lighting fixture that provides a spatial region between the lower end of the mounting portion and the central portion of the lighting fixture and emits light from the light source arranged at the peripheral portion of the lighting fixture toward the central portion. It is known (see, for example, Patent Document 1). According to this structure, since the emitted light from the light source enters the space region, it is possible to irradiate the central portion of the lighting fixture.

JP 2008-300203 A

  However, in the lighting fixture disclosed in Patent Document 1, when the fixture size is increased, the distance between the light source and the central portion of the lighting fixture is increased, so that the amount of light at the central portion is reduced. In addition, since the distance between the lower end of the mounting portion and the central portion of the lighting fixture is small and the spatial region is small, the amount of light entering the spatial region is small, and the amount of light emitted from the central portion of the lighting fixture is still small. The center of the instrument may appear dark.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a luminaire that can emit light uniformly from the entire light emitting surface.

  The lighting fixture of the present invention includes a housing of the fixture, a fixture mounting portion provided in a central portion of the casing, and a plurality of light sources arranged around the mounting portion. In a lighting fixture that irradiates light in the opposite direction, a first reflector disposed around the light source and closer to the center of the housing than the light source, and a first reflector provided on the inner surface of the housing 2, and the first reflector has a light transmission part in part, and the light emitted from the light source is directed to the second reflector by the first reflector. The light is reflected in the peripheral direction of the luminaire, and the light transmitted through the light transmission part is directed to the central part in the light irradiation direction.

  In this lighting apparatus, it is preferable that a light diffusion cover is provided on the light irradiation side surface.

  The lighting apparatus further includes a third reflecting plate disposed so as to cover the mounting portion, and the third reflecting plate transmits light transmitted through the light transmitting portion of the first reflecting plate to the light irradiation side. It is preferable to reflect the light.

  In this lighting fixture, the first reflecting plate is an arcuate surface whose cross-sectional shape has a focus, and the light source includes a first light source disposed at a focal position of the first reflecting plate, And a second light source disposed at a position deviated from the focal position.

  In this lighting fixture, it is preferable that the second light source is disposed farther than the first light source with respect to the first reflector.

  In this lighting fixture, the first reflector preferably has a parabolic shape in cross section.

  According to the luminaire according to the present invention, the light reflected from the first reflector out of the light emitted from the light source is further reflected by the second reflector or directed toward the peripheral edge of the luminaire, and the mounting portion. It is irradiated in the light irradiation direction opposite to. Moreover, since the light transmitted through the light transmission part of the first reflecting plate out of the light emitted from the light source is irradiated to the central part in the light irradiation direction where the mounting part is provided, the light emitted from the light source is uniform from the entire lighting fixture. Can be emitted.

(A) is side sectional drawing of the lighting fixture which concerns on the 1st Embodiment of this invention, (b) is a perspective view of the 1st reflecting plate with the lighting fixture, (c) is the lighting installed in the ceiling The top view when the instrument is viewed from below. (A) is a top view which shows the modification of the lighting fixture, (b) is a top view which shows another modification. (A) is side sectional drawing of the lighting fixture which concerns on the 2nd Embodiment of this invention, (b) is a perspective view of the 1st reflecting plate with which the lighting fixture is provided, (c) is the reflective cover with which the lighting fixture is provided. FIG. The perspective view which shows the modification of the reflection cover. (A) is a sectional side view of the lighting fixture which concerns on the 3rd Embodiment of this invention, (b) is a perspective view of the 1st reflecting plate with which the lighting fixture is provided. (A) is a sectional side view of a conventional ceiling light, (b) is a perspective view of the ceiling light.

  Hereinafter, the lighting fixture according to the first embodiment of the present invention will be described with reference to FIGS. Here, the lighting fixture 1 of the present embodiment is a ceiling-mounted ceiling light as an example. The lighting device 1 includes a housing 2 of the device, a mounting portion 3 of the fixture provided in the center of the housing 2, a plurality of light sources 4 disposed around the mounting portion 3, and around the light source 4. And a first reflector 5 disposed closer to the center of the housing 2 than the light source 4. Moreover, the lighting fixture 1 is provided with the light-diffusion cover 6 in the surface at the side of light irradiation. In the following description, the central portion of the light diffusion cover 6 below the attachment portion 3 is referred to as a central portion 6a, the portion including a predetermined region from the periphery of the light diffusion cover 6 is referred to as a peripheral portion 6b, and other light diffusion covers. The portion 6 is referred to as an intermediate portion 6c. The arrows in FIG. 1A indicate the optical path of the emitted light from the light source 4. In addition, in FIG.1 (c), illustration of the light-diffusion cover 6 is abbreviate | omitted.

  In the lighting fixture 1 of the present embodiment, the attachment portion 3 is attached to the power feeding portion 7 installed on the ceiling of the living room, so that the electrical connection between the power feeding portion 7 and the lighting fixture 1 is fixed to the ceiling. The In addition, a holding member 8 is disposed between the housing 2 of the lighting fixture 1 and the ceiling so as to hold these intervals and stabilize the fixation of the lighting fixture 1. The holding member 8 is disposed so as to surround the attachment portion 3, and is fixed to the ceiling in advance with screws or the like when the lighting apparatus 1 is constructed, or is fixed or integrated to the outer surface of the housing 2.

  The housing 2 is a member constituting the upper surface side of the lighting fixture 1, and the light source 4 and the first reflector 5 are fixed to a surface opposite to the surface facing the ceiling (hereinafter referred to as the housing inner surface 2a). Is done. The housing inner surface 2a has reflectivity and is formed as a second reflecting plate. For example, a metal material such as aluminum is preferably used as the material of the housing 2. Further, as the housing 2, for example, a member obtained by processing polyethylene terephthalate (PET) resin into a predetermined shape, and the housing inner surface 2 a made reflective by applying a mirror finish or applying a white paint may be used. Good. In this case, since the inside of the lighting fixture 1 may be exposed to a high temperature due to the heat generated by the light source 4, a material having excellent heat resistance and durability is used. The shape of the housing 2 is a member that defines the outer shape of the luminaire 1 and is not limited to the disc shape shown in FIG.

  The attachment part 3 is formed in, for example, a dish shape having a predetermined thickness, and is provided at the center part of the housing 2 and includes a hook-shaped terminal (not shown) protruding outward from the instrument. The terminal is electrically connected to a terminal receiving portion (not shown) formed in the power feeding portion 7, thereby enabling power supply to a circuit for causing the light source 4 to emit light, and the lighting fixture 1. Realization of fixing to the ceiling. Thereby, the lighting fixture 1 can simplify construction. In addition, the wiring etc. which are connected to said circuit are accommodated in the inside of the attachment part 3, for example.

  The light source 4 is arrange | positioned on the housing | casing inner surface 2a so that the circumference | surroundings of the attachment part 3 may be enclosed. As the light source 4, an LED module that emits white light is preferably used in this example. The number of the light sources 4 is not particularly limited, and is appropriately selected according to the manufacturing cost or desired brightness. In the LED module used for the light source 4, for example, an LED chip is mounted on a mounting substrate (not shown), and the LED chip is covered with a resin material containing a phosphor or the like. A wiring board (not shown) having a power supply wiring pattern is provided on the casing inner surface 2a, and the light source 4 is held by the casing 2 via the wiring board.

  The first reflecting plate 5 is located between the light source 4 and the mounting portion 3 and is provided so as to surround the mounting portion 3. The first reflecting plate 5 mainly reflects the light emitted from the light source 4 and has a peripheral edge of the light diffusion cover 6. The light distribution is controlled to the part 6b and the intermediate part 6c. In the present embodiment, the first reflecting plate 5 has a light transmission portion 5a that transmits the light emitted from the light source 4 as a part thereof. The light transmission part 5 a is composed of a plurality of holes formed in the first reflecting plate 5. The plurality of holes are formed in the first reflecting plate 5 so as to transmit the emitted light from the light source 4 toward the central portion 6 a of the light diffusion cover 6. As a method for forming the hole, for example, a method of punching the first reflecting plate 5 can be cited.

  If the shape of the 1st reflecting plate 5 is a shape which can irradiate light uniformly to the housing | casing 2 and can irradiate light to the center part of the lighting fixture 1 through the light transmissive part 5a. Although not particularly limited, the cross-sectional shape is preferably a parabolic shape. In this way, when the light source 4 is arranged at the parabolic focus, the light from the light source 4 is reflected in the substantially horizontal direction by the first reflecting plate 4. Can be more. Moreover, since light can be radiated | emitted in a wide range, a part of light is irradiated also to the attachment surface (for example, ceiling) of the lighting fixture 1, and the effect as ambient illumination can be acquired.

  As a material of the first reflecting plate 5, for example, a metal member, a metal surface treatment member, a resin molding member, or the like can be used. Examples of the metallic member include stainless steel (SUS304), aluminum, and anodized. Examples of the metal surface treatment member include chrome plating, aluminum vapor deposition, gold plating, gold vapor deposition, silver plating, and silver vapor deposition products. Examples of the resin molded member include those obtained by molding metal flakes containing a metal such as aluminum in a resin.

  In the present embodiment, when the first reflector 5 is viewed from the indoor side (below) the lighting fixture 1 installed on the ceiling, the plurality of first reflectors 5 are hexagonal around the mounting portion 3. It arrange | positions so that it may surround in a shape (refer FIG.1 (c)). In addition to this configuration, for example, as shown in the modified example of FIG. 2A, an annular first reflecting plate 5 is disposed on the housing 2 so as to surround the mounting portion 3. Also good. Further, for example, as shown in another modification of FIG. 2B, when the shape of the housing 2 is a square, the plurality of first reflectors 5 have a frame shape correspondingly. It may be arranged. 2A and 2B, the illustration of the light diffusion cover 6 is omitted.

  The light diffusion cover 6 is a general-purpose sealing member formed in a bowl shape or a dome shape, and is attached to the outer peripheral edge of the housing 2 so as to cover the lower part of the entire lighting fixture 1. As the light diffusing cover 6, for example, a resin material having translucency such as polycarbonate or acrylic is molded into a bowl shape and fine irregularities are formed on the surface, or a resin material containing diffusing particles or the like is included. Can be used.

  In the lighting fixture 1 of this embodiment, the emitted light from the light source 4 is irradiated to the 1st reflecting plate 5, or the peripheral part 6b or the intermediate part 6c of the light-diffusion cover 6 directly (FIG. 1 (FIG. 1 mentioned above)). a)). Of the light emitted from the light source 4 to the first reflecting plate 5, the light transmitted through the light transmitting portion 5 a of the first reflecting plate 5 without being reflected by the first reflecting plate 5 is a light diffusion cover. 6 is irradiated to the central portion 6a or the intermediate portion 6c. Of the light emitted from the light source 4 to the first reflecting plate 5, the light reflected by the first reflecting plate 5 is applied to the housing 2 and reflected, and then the peripheral portion 6 b of the light diffusion cover 6. Or it irradiates to the intermediate part 6c.

  According to the lighting fixture 1 of the present embodiment, the light reflected by the first reflecting plate 5 out of the light emitted from the light source 4 is further reflected by the housing inner surface 2a (second reflecting plate), or It goes to the peripheral direction of the luminaire 1. Further, out of the emitted light from the light source 4, the emitted light in the outer peripheral direction from the first reflecting plate 5 goes directly to the intermediate portion 6 c of the light diffusion cover 6. Thereby, most of the emitted light from the light source 4 is irradiated to the peripheral edge portion 6b or the intermediate portion 6c of the light diffusion cover 6 on the side opposite to the attachment portion 3. Moreover, the light which permeate | transmitted the light transmissive part 5a of the 1st reflecting plate 5 among the emitted light from the light source 4 is irradiated to the light irradiation direction center part with the attachment part 3. FIG. As a result, the light emitted from the light source 4 can be uniformly emitted from the entire lighting fixture 1.

  Next, the lighting fixture 1 which concerns on the 2nd Embodiment of this invention is demonstrated with reference to Fig.3 (a)-(c) and FIG. The luminaire 1 according to the present embodiment includes a reflective cover 9 (third reflective plate) disposed so as to cover the attachment portion 3, and the reflective cover 9 is light of the first reflective plate 5. The light transmitted through the transmission part 5a is reflected to the light irradiation side. In the present embodiment, the light transmission part 5 a is provided along the interface between the first reflecting plate 5 and the housing 2. The arrows in FIG. 3 indicate the optical path of the emitted light from the light source 4.

  The reflection cover 9 is formed in a dome shape, and its side surface 9 a reflects the irradiated light to the central portion 6 a of the light diffusion cover 6 without reflecting the irradiated light to the intermediate portion 6 c of the light diffusion cover 6. It is configured. The shape of the reflective cover 9 is not limited to the example shown in FIG. 3C. For example, the shape of the reflective cover 9 is a quadrangular pyramid like the modified example shown in FIG. 3C, or a cone, a truncated cone, a pyramid, a pyramid. It may be trapezoidal or the like. As the material of the reflection cover 9, the same material as that of the first reflection plate 5 can be used. Other configurations are the same as those in the first embodiment.

  In the lighting fixture 1 of this embodiment, the emitted light from the light source 4 is reflected by the first reflecting plate 5 or directly irradiated to the peripheral edge 6b or the intermediate portion 6c of the light diffusion cover 6. Of the light irradiated from the light source 4 to the first reflecting plate 5, the light transmitted through the light transmitting portion 5 a without being reflected by the first reflecting plate 5 is irradiated to the reflecting cover 9 and reflected. After that, the central portion 6a of the light diffusion cover 6 is irradiated. Of the light emitted from the light source 4 to the first reflecting plate 5, the light reflected by the first reflecting plate 5 is applied to the housing 2 and reflected, and then the peripheral portion 6 b of the light diffusion cover 6. Or it irradiates to the intermediate part 6c.

  According to the lighting fixture 1 of the present embodiment, the light transmission part 5 a is provided along the interface between the first reflection plate 5 and the housing 2, and the reflection cover 9 is provided so as to cover the attachment part 3. Therefore, the light emitted from the light source 4 to the mounting portion 3 side can be applied to the central portion 6 a of the light diffusion cover 6. Therefore, the light emitted from the light source 4 to the mounting portion 3 side can be used efficiently.

  Moreover, also in the lighting fixture 1 of this embodiment, while being irradiated to the center part 6a of the light-diffusion cover 6, as mentioned above, the emitted light from the light source 4, and the light reflected by the 1st reflecting plate 5 are reflected. Is irradiated to the peripheral edge portion 6b or the intermediate portion 6c of the light diffusion cover 6. Therefore, similarly to the first embodiment, the light emitted from the light source 4 can be spread over the entire surface of the light diffusion cover 6 and can be uniformly emitted from the entire light output surface of the lighting fixture 1.

  Next, the lighting fixture 1 which concerns on the 3rd Embodiment of this invention is demonstrated with reference to Fig.5 (a), (b). The lighting fixture 1 is a circular arc surface in which the cross-sectional shape of the first reflector 5 has a focal point, the light source 4 is arranged at the focal position of the first reflector 5, and the first light source 4a from the focal position. And a second light source 4b arranged at a shifted position. The first light source 4a and the second light source 4b are disposed on the housing inner surface 2a along the interface between the first reflector 5 and the housing 2 at a predetermined distance from each other. In this example as well, LEDs are used as the first light source 4a and the second light source 4b. Other configurations are the same as those of the second embodiment. Further, the solid line arrow in FIG. 5A indicates the optical path of the emitted light from the first light source 4a, and the dotted line arrow indicates the optical path of the emitted light from the second light source 4b.

  In the lighting fixture 1 of the present embodiment, since the first light source 4a is at the focal position of the first reflecting plate 5, the light emitted from the first light source 4a to the first reflecting plate 5 is horizontal. And is mainly applied to the peripheral edge portion 6b of the light diffusion cover 6 (see FIG. 1A). Further, light that is not irradiated from the first light source 4 a to the first reflector 5 is mainly irradiated to the intermediate portion 6 c of the light diffusion cover 6. Since the second light source 4b is located at a position shifted from the focal position of the first reflecting plate 5, light distribution control such as the emitted light from the first light source 4a is not performed. For example, the emitted light is directly transmitted. Alternatively, the light is reflected by the first reflecting plate 5 and the housing 2 and irradiated mainly to the intermediate portion 6c (see FIG. 1A) of the light diffusion cover 6. Therefore, according to the luminaire 1 of the present embodiment, while the amount of light emitted from the first light source 4a to the peripheral portion of the luminaire 1 is increased, the light emitted from the second light source 4b is increased. The entire light diffusion cover 6 can be irradiated with light uniformly. Therefore, the emitted light can be uniformly emitted from the entire light emitting surface of the lighting fixture 1 without unevenness.

  It is preferable that the 2nd light source 4b is arrange | positioned farther than the 1st light source 4a with respect to the attachment location to the housing | casing 2 of the 1st reflecting plate 5. FIG. By so doing, heat is less likely to be generated than when the second light source 4b is close to the first reflector 5, so that the heat dissipation of the first light source 4a and the second light source 4b is improved. The luminous efficiency of the lighting fixture 1 can be improved.

  The present invention is not limited to the configuration of the embodiment described above, and various modifications can be made without departing from the spirit of the invention. For example, the shape of the light transmitting portion 5a of the first reflecting plate 5 is not particularly limited as long as it transmits light. For example, the light transmitting portion 5a of the first embodiment and the second light transmitting portion 5a are not limited. It may be a combination of the light transmission part 5a of the embodiment. Further, the light transmitting portion 5a is not limited to the illustrated hole portion, and a translucent material having no reflectivity may be used in the portion, and a lens or the like may be attached to the hole portion.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Case 2a Case inner surface (2nd reflecting plate)
DESCRIPTION OF SYMBOLS 3 Mounting part 4 Light source 4a 1st light source 4b 2nd light source 5 1st reflecting plate 6 Light-diffusion cover 9 Reflecting cover (3rd reflecting plate)

Claims (6)

A fixture housing, a fixture mounting portion provided at a central portion of the casing, and a plurality of light sources disposed around the mounting portion, and irradiates light in a direction opposite to the mounting portion. In the lighting equipment to
A first reflector disposed around the light source and closer to the center of the housing than the light source;
A second reflector provided on the inner surface of the housing,
The first reflector has a light transmission part in part, and reflects light emitted from the light source in the direction of the second reflector and the peripheral direction of the lighting fixture by the first reflector. The lighting apparatus characterized by directing the light transmitted through the light transmitting portion toward the center of the light irradiation direction.   The light fixture according to claim 1, further comprising a light diffusion cover on the light irradiation side surface.   A third reflecting plate disposed to cover the mounting portion; and the third reflecting plate reflects light transmitted through the light transmitting portion of the first reflecting plate to the light irradiation side. The lighting fixture according to claim 1 or claim 2, wherein   The first reflector is a circular plane whose cross-sectional shape has a focal point, and the light source is deviated from the focal position with the first light source disposed at the focal position of the first reflector. The lighting apparatus according to claim 1, further comprising: a second light source disposed at a position.   The lighting apparatus according to claim 4, wherein the second light source is disposed farther than the first light source with respect to the first reflecting plate.   The lighting fixture according to any one of claims 1 to 5, wherein the first reflector has a parabolic cross-sectional shape.

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