JP6443749B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  In recent years, illumination devices that emit white light using light emitting diodes (LEDs) are becoming popular from the viewpoint of energy saving and the like. As such an illuminating device, there is known an illuminating device that emits white light having a relatively low cost and high brightness using an LED that emits blue light and a phosphor that emits yellow fluorescence that is complementary to blue. ing. (See Patent Document 1).

JP 2001-234514 A

  However, since the technique described in Patent Document 1 has few red wavelength components, there is a possibility that the color rendering properties may be insufficient depending on the object to be illuminated.

  In view of the above problems, an object of the present invention is to provide an illumination device that can improve color rendering properties inexpensively and easily.

In order to achieve the above object, a first aspect of the present invention includes a light source that emits white light, a reflective surface that reflects white light emitted from the light source, and a buffer plate that extends along the light source. A reflecting member, a light source and a main body for holding the reflecting member, wherein the reflecting surface is formed with a red region so that a ratio per unit area is constant, and the buffer plate includes the light source And a part of the light reflected from the reflection surface .

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which can improve color rendering property cheaply and easily can be provided by forming a red area | region in a reflective surface.

It is a side view explaining an embedding apparatus provided with the illuminating device which concerns on embodiment of this invention. It is sectional drawing seen from the side surface explaining the illuminating device which concerns on embodiment of this invention. It is sectional drawing seen from the front side explaining the illuminating device which concerns on embodiment of this invention. It is a bottom view explaining the illuminating device which concerns on embodiment of this invention. It is an enlarged plan view explaining the reflective surface of the illuminating device which concerns on embodiment of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals, and redundant description is omitted. However, the drawings are schematic, and portions having different dimensional relationships and ratios between the drawings are included. Further, the embodiment described below exemplifies an apparatus and a method for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, The layout is not specified as follows.

(Lighting device)
The illumination device 2 according to the embodiment of the present invention is provided as a part of the embedding device 1 embedded in the ceiling surface C, for example, as shown in FIG. The embedding device 1 generally includes a rectangular parallelepiped housing 11 and a holding base 12 that holds the lighting device 2 inside the housing 11. The holding stand 12 holds the lighting device 2 so that the lighting device 2 illuminates the wall surface A with a distance D in the horizontal direction from the ceiling surface C having the height E, for example.

  For example, as shown in FIG. 2, the embedding device 1 is fixed relative to the ceiling surface C by a fixture 13 in a state where the housing 11 is horizontal to the ceiling surface C. The holding table 12 is fixed to the housing 11. The holding base 12 has an inclined surface 121 that is inclined so as to face the wall surface A, and holds the illumination device 2 so that the illumination device 2 faces the wall surface A on the inclined surface 121.

  In addition, the embedding device 1 includes a cover 15 that covers the lower side of the housing 11 and a ventilation path 17 connected to the duct 170 of the air conditioning equipment. The cover 15 is fixed to the housing 11 by a fixture 16, and the ventilation path 17 is fixed to the housing 11 by a fixture 18. The cover 15 has a protruding portion 151 that protrudes downward on the side opposite to the wall surface A side of the lighting device 2. The protrusion 151 has an opening at the lower end that exposes the outlet 171 of the ventilation path 17. The cover 15 closes the area of the lower side of the housing 11 excluding the lighting device 2 and the outlet 171. The protruding portion 151 may function as a light blocking portion that blocks a part of the light emitted from the lighting device 2 that travels to the side opposite to the wall surface A side.

  As shown in FIGS. 2 and 3, the illumination device 2 includes a plurality of light sources 21 that emit white light using light emitting diodes (LEDs), and a reflective surface 31 that reflects the white light emitted from the light sources 21. The reflection member 3 and the main body 23 holding the light source 21 and the reflection member 3 are provided.

  The light source 21 is, for example, a straight tube lamp that emits white light with high luminance using an LED that emits blue light and a phosphor that emits yellow fluorescence. The light source 21 is attached to a socket 22 fixed to the main body 23 by a fixture 24. The light source 21 emits white light by being fed from the socket 22.

  The main body 23 is, for example, a rectangular flat plate-like container having an open lower surface. The main body 23 is fixed to the holding table 12 in a state where the main body 23 is inclined along the inclined surface 121 so as to face the wall surface A side. The main body 23 includes a power supply circuit 25 that supplies power to the light source 21 via the socket 22 inside the upper surface. The power supply circuit 25 can adjust the light amount of the light source 21 by an operator's operation on an operation unit (not shown). The main body 23 includes a heat radiating plate 27 that dissipates heat generated by the power supply circuit 25 on the upper surface. In addition, the main body 23 includes a panel 28 that is a transparent plate formed so as to close the lower surface. The main body 23 is formed of a metal plate such as copper, for example. The panel 28 is formed from transparent materials, such as an acrylic resin and glass, for example.

  The reflecting member 3 includes a reflecting surface 31 that reflects white light emitted from each light source 21, a plurality of buffer plates 33, and a frame member 32 that holds each reflecting surface 31 and the buffer plate 33. The frame member 32 is, for example, a rectangular flat container whose bottom surface is opened as a rough outline. The frame member 32 is formed of a metal plate such as copper, for example.

  Each of the reflection surfaces 31 is a mirror surface having an arch-shaped cross section so as to swell upward, and reflects the white light emitted from the light source 21 mainly downward in the direction toward the wall surface A. The reflecting surface 31 is formed in a semi-cylindrical shape so as to correspond to each light source 21, and is made of a metal material that substantially reflects light in the visible light region, such as aluminum. The reflecting surface 31 may have a parabola in cross section.

  The buffer plate 33 is a metal plate that extends along each light source 21. As shown in FIG. 4, the buffer plate 33 is formed such that one side along the extending direction is linear and the other side is formed in a zigzag shape. The buffer plate 33 reduces unevenness on the wall surface A of the light emitted from the light source 21 and the light reflected by the reflecting surface 31, and improves the uniformity. The buffer plate 33 is arranged so that a linear portion is connected to the side close to the wall surface A among the end portions of the arch of each reflecting surface 31, and each zigzag tip portion reaches the center portion of the arch. . The buffer plate 33 closest to the wall surface A is formed wider than the other buffer plates.

  The reflecting member 3 is fixed to the inside of the main body 23 in a state where the reflecting surfaces 31 and the buffer plates 33 are fixed relative to the frame member 32 by the reinforcing member 34 and the fixture 35. The reflection surface 31 and the frame member 32 are provided with through holes in regions corresponding to the sockets 22, and the reflection member 3 is installed in the main body 23 so that the sockets 22 are located inside the reflection surface 31. . In a state where each light source 21 is not attached to the socket 22, the light source 21 is attached to the socket 22 after the reflecting member 3 is fixed inside the main body 23. The main body 23 to which each light source 21 is attached is closed by a panel 28.

  The illumination device 2 further includes a louver unit 4 that is provided on the lower surface side of the panel 28 and reduces light emitted from the light source 21 and traveling in an oblique direction with respect to the light source 21. The louver part 4 includes a rectangular frame part 41 corresponding to the lower surface of the main body 23, and a plurality of louvers 42 arranged so as to be orthogonal to the light source 21 inside the frame part 41. The louver 42 is a plate-like member disposed so as to be perpendicular to the light source 21 and the wall surface A, and is formed of a metal plate such as copper, for example. The louver part 4 is fixed to the lower surface side of the main body 23 by a fixing tool 43 or the like, and is connected to the main body 23 by a wire 44 that prevents the louver part 4 (see FIG. 2) from dropping.

  The louver 42 arrangement interval and the zigzag pitch of the buffer plate 33 correspond to each other. As shown in FIG. 4, the louvers 42 are arranged so as to be located at valleys of the buffer plate 33 in plan view.

  As shown in FIG. 5, a red region R is formed on the reflecting surface 31 so that the ratio per unit area is constant. Each region R is, for example, a circle having a diameter P, and is arranged in a staggered manner with a pitch of an interval Q. The region R is formed by printing a red paint on the reflection surface 31.

  The illuminating device 2 according to the embodiment of the present invention can be employed in, for example, an exhibition space where art works and materials are displayed. In the example illustrated in FIG. 1, the lighting device 2 illuminates a wall surface A or an object disposed in the vicinity of the wall surface A. The light source 21 using a blue LED has a small wavelength component in the red region and may lack color rendering properties. However, the lighting device 2 has a color rendering property because the red region R is formed on the reflection surface 31. Can be improved.

  For example, as the light source 21, a straight tube LED lamp having a color temperature of 4000K and an average color rendering index Ra95 can be used. In the example shown in FIG. 1, when the lighting device 2 has a horizontal width of about 60 cm and is inclined about 15 ° with respect to the ceiling surface C, the distance D is about 1 m and the height E is 4 m. Can be about. For example, the red region R is formed with a diameter P of 2 mm and an interval Q of 10 mm, so that the ratio per unit area is about 3.6%. The ratio of the region R may be appropriately changed according to the type of the light source 21, the reflection surface 31, the exhibit, the wall surface A, the surrounding environment, and the like. The ratio of the region R can be set to 1 to 10%, for example. In addition, the region R is not limited to a circular dot pattern, and may be a stripe pattern, a lattice pattern, or the like as long as the ratio per unit area is constant.

  According to the illuminating device 2 according to the embodiment of the present invention, the red region R is formed at a predetermined ratio on the reflecting surface 31, thereby improving the uniformity in the wavelength spectrum while keeping the luminance high, Color rendering can be improved inexpensively and easily.

  Moreover, according to the illuminating device 2 which concerns on embodiment of this invention, in order to form the area | region R with the coating material printed on the reflective surface 31, a precise light distribution is not impaired compared with the case where a color filter is used, Less fading.

(Other embodiments)
As mentioned above, although this invention was described by embodiment, it should not be understood that the description and drawing which form a part of this indication limit this invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

For example, in the embodiment already described, the red region R of the reflecting surface 31 may change the ratio in the direction orthogonal to the light source 21 as long as the ratio per unit area in the extending direction of the light source 21 is constant. . For example, the area of the reflective surface 31 that reflects light toward the range in which the light directly emitted from the light source 21 increases in the light emitted from the illumination device 2 has a proportion of the red area R as compared with the other areas. You may make it increase.
The embodiment has been described using red as the region R. However, the region R may be configured as a color other than red according to the light source.

  In addition to the above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

2 Illuminating device 3 Reflecting member 21 Light source 23 Main body 31 Reflecting surface

Claims (5)

A light source that emits white light;
A reflective member having a reflective surface for reflecting white light emitted from the light source, and a buffer plate extending along the light source ;
A main body for holding the light source and the reflecting member,
The reflective surface is formed with a red region so that the ratio per unit area is constant ,
The buffer device blocks the light emitted from the light source and a part of the light reflected on the reflecting surface .   The reflecting surface is a mirror surface whose cross section is curved in an arch shape,
  The buffer plate is arranged so that one side along the extending direction of the light source is formed in a straight line, the other side is formed in a zigzag shape, and each zigzag tip part reaches the center of the arch of each reflection surface. The lighting device according to claim 1. The light source lighting device according emitting diode that emits blue light by a phosphor that emits yellow fluorescence, to claim 1 or 2, characterized in that emits white light. The lighting device according to any one of claims 1 to 3, wherein the red region is formed on the reflection surface at a rate of 1 to 10% per unit area. The red area, the lighting device according to any one of claims 1 to 4, characterized in that arranged in a staggered manner.

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