JP2011171226A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an aesthetic appearance and brightness feeling of an illumination space. <P>SOLUTION: A louver frame 5 is formed of a light guide. The light guide is molded in a rectangular frame shape by mixing light diffusion beads in synthetic translucent resin material (for example, acrylic resin or the like). Therefore, light emitted by a light source 2 is irradiated to a floor surface, and base illumination is achieved. On the other hand, the louver frame 5 as the light guide refracts the light emitted by the light source 2, and is diffused by the diffusion beads to emit light, and light irradiated upward illuminates a ceiling surface S. As a result, light irradiated from the light source (a primary light source) 2 to the floor surface satisfies necessary and sufficient luminance of a work surface, and light irradiated from the louver frame (a secondary light source) 5 to the ceiling surface S can enhance the brightness feeling (a value of a brightness feeling index) of the illumination space. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lighting fixture.

  For illumination of a space where a large number of people work, such as an office room or a classroom, illumination light emitted from a plurality of lighting fixtures installed on the ceiling is usually used. In other words, lighting of the entire lighting space (called base lighting) is performed by a plurality of lighting fixtures installed on the ceiling, and if necessary, a stand-type lamp placed on the work desk (desk) of each worker Partial lighting is performed by a lighting fixture or the like.

  By the way, in the conventional base illumination, it has been considered desirable to pay attention to the illuminance on the floor surface or the work surface (the desk surface of the work desk, etc.) and the illuminance is within a specified range. However, there is a gap between the brightness sensation felt by humans and the ideal illuminance value when looking at the entire illumination space.

  Therefore, conventionally, a concept of “brightness feeling index (Feu)” is used as an index for evaluating the brightness feeling of the illumination space (see, for example, Patent Document 1). Here, the “brightness sensation index” is a comprehensive evaluation of “brightness” perceived with respect to the space when the illumination space is observed, and “color mode boundary luminance” ( Reference 1: Evaluation of the brightness in the real environment by measuring the brightness size of the illumination-recognition visual space, specified based on the Journal of the Illuminating Society of Japan, Vol. 86, No. 11, 2002, P830-836, Yamaguchi et al. Is done. The “color mode boundary luminance” is the level of luminance at which the color chart placed in the illumination space is recognized as an object (object color) placed in the illumination space when viewed from the observer. It is the brightness level that is in the middle of the brightness level that is recognized as the light source (light source color) that emits light by itself, and it looks unnatural as an object placed in the illumination space. It represents the brightness of the lighting space quantitatively.

  Here, the present applicant has already provided a lighting fixture capable of improving the feeling of brightness as compared with conventional base lighting (see, for example, Patent Document 2). Such a lighting fixture uses a straight tube fluorescent lamp as a light source, a pen dish-type fixture main body installed on the ceiling, and a part of light emitted from the light source arranged below the fixture main body on the ceiling surface. And a reflecting material that reflects downward and transmits the remaining light downward. Thus, since the light reflected by the reflecting material is irradiated on the ceiling surface around the fixture body, the brightness of the lighting space is improved compared to a conventional lighting fixture that does not have the reflecting material. is there.

JP 2007-171055 A JP 2009-289437 A

  However, since the lighting fixture described in Patent Document 2 has a structure in which a reflective material is suspended below the fixture body embedded in the ceiling surface, the beauty of the lighting space is impaired. was there.

  This invention is made | formed in view of the said situation, The objective is to provide the lighting fixture which can aim at the improvement of the beauty | look of a lighting space, and a brightness feeling.

  In order to achieve the above object, the invention of claim 1 causes a primary light source that emits light by itself, a secondary light source that emits light by reflecting, refracting, or diffusing light emitted from the primary light source, and causing the primary light source to emit light. A lighting means, a primary light source, a secondary light source, and an appliance main body that is embedded in the ceiling surface while holding the lighting means, and the appliance main body is formed in a box shape having an open bottom surface. The next light source includes a light guide disposed on an opening edge of the instrument body.

  According to a second aspect of the present invention, in the first aspect of the invention, a plurality of louvers that block a part of the light emitted from the primary light source, and a louver frame that supports the louvers and is attached to an opening edge of the instrument body. The louver frame is formed integrally with the light guide.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, one or a plurality of high-luminance light emitting portions that increase the luminance of the secondary light source in a substantially horizontal direction are provided on the lower surface side of the light guide. Features.

  The invention of claim 4 is the invention according to any one of claims 1 to 3, wherein the primary light source has two types, one that contributes to the light emission of the secondary light source and one that does not contribute to the light emission. The means emits the two types of primary light sources individually.

  According to the present invention, it is possible to improve the beauty and brightness of the illumination space.

1 shows an embodiment of the present invention, in which (a) is a sectional view in a state of being embedded in a ceiling, and (b) is an exploded plan view. It is principal part sectional drawing of embodiment which provided the high-intensity light emission part in the louver frame in the same as the above.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The lighting fixture of this embodiment is provided with the fixture main body 1, the light source 2, the lighting circuit part 3, the louver 4, and the louver frame 5, as shown in FIG.

  The instrument body 1 is formed in a flat rectangular box shape whose bottom surface is opened by processing a metal plate. And this instrument main body 1 is embedded by the embedding hole provided in the ceiling surface S, as shown to Fig.1 (a). However, since the structure for fixing the instrument body 1 to the ceiling is well known in the art, illustration and description thereof are omitted.

  The light source 2 is composed of a large number (18 in the illustrated example) of light emitting diodes 20 that emit white light as shown in FIG. 1B, and is arranged on the inner bottom surface of the instrument body 1 in the vertical and horizontal directions. The light source 2 corresponds to a primary light source that emits light by itself. However, the light source 2 is not limited to a light emitting diode, and may be an organic EL element or a fluorescent lamp.

  The lighting circuit unit 3 is installed on the top surface of the instrument body 1, converts AC power supplied from an AC power source (not shown) into DC power, and feeds the converted DC power to the light source 2, that is, the light source 2, that is, light emission. The diode 20 is caused to emit light (light on).

  The louver 4 is formed of a thin plate shape, and a total of seven pieces arranged between the light emitting diodes 20 arranged in the vertical direction and between the light emitting diodes 20 arranged in the horizontal direction are combined in a lattice shape. The end is fixed to the louver frame 5 (see FIG. 1B). The louver frame 5 is made of a light guide, and the light guide is formed in a rectangular frame shape by mixing light diffusing beads in a synthetic resin material having translucency (for example, acrylic resin). Note that the louver 4 may be integrally formed with the louver frame 5 (light guide) by two-color molding using a synthetic resin material (having no translucency) different from the louver frame 5 (light guide). Alternatively, the metal louver 4 may be insert-molded into the louver frame 5 (light guide). The louver frame 5 is attached to the opening edge of the lower surface of the instrument body 1 by an appropriate method such as screwing.

  When the lighting fixture configured as described above is embedded in the ceiling S and the light source circuit 2 emits light (lights up), the light emitted from the light source 2 is emitted toward the floor surface. Base lighting is performed. On the other hand, the louver frame 5 which is a light guide emits light by refracting the light emitted from the light source 2 and diffusing it with diffusion beads, and illuminates the ceiling surface S with the light irradiated upward. Therefore, the work space is made to have a necessary and sufficient illuminance by the light emitted from the light source (primary light source) 2 toward the floor surface, and the illumination space is irradiated by the light emitted from the louver frame (secondary light source) 5 toward the ceiling surface S. The brightness feeling (value of brightness feeling index) can be increased. And since the light guide (louver frame 5) which is a secondary light source is attached to the opening edge of the instrument main body 1, it is more beautiful than the case where the reflector protrudes below the ceiling surface S as in the conventional example. Can be improved. In addition, since the light guide is formed integrally with the louver frame 5, it is possible to save space and reduce manufacturing costs by reducing the number of parts.

  By the way, as a method for enhancing the sense of brightness in the room, conventionally, a method has been proposed in which high-luminance light emitting units are arranged in an appropriate size and an appropriate number. This method is based on the so-called “sparkle theory”, and the sparkle theory is described in detail in Japanese Patent Laid-Open No. 8-279306. Also in this embodiment, if the light-emitting body (louver frame 5) is provided with a high-luminance light-emitting portion based on the above-described sparkle theory, the brightness of the illumination space can be further enhanced. Such a high-intensity light-emitting part can be comprised by the substantially square pyramid-shaped protrusion 50 which protruded from the lower surface of the louver frame 5, as shown in FIG. That is, light emitted outside the louver frame 5 through the high-luminance light emitting portion (projecting portion) 50 is radiated in a range close to the horizontal direction (specifically, a range having a vertical angle of 60 degrees or more). The brightness of the lighting space can be improved by increasing the brightness of the lighting. Note that the high-intensity light emitting units 50 are arranged in an appropriate number at appropriate locations on the lower surface of the louver frame 5.

  By the way, among the 18 light emitting diodes 20 in total, the central four light emitting diodes 20 surrounded by other light emitting diodes 20 substantially emit light from the secondary light source (louver frame 5). It does not contribute. In other words, only a total of 14 light emitting diodes 20 arranged around the louver frame 5 contribute to the light emission of the secondary light source (louver frame 5). Therefore, the four light emitting diodes 20 in the central part and the fourteen peripheral light emitting diodes 20 are connected to a separate power supply line, and supplied from the lighting circuit unit 3 to the peripheral light emitting diodes 20 through the power supply line, for example. The feeling of brightness can be adjusted by increasing or decreasing the power.

1 Instrument body 2 Light source (primary light source)
3 lighting circuit 4 louver 5 louver frame (secondary light source, light guide)

Claims (4)

A primary light source that emits light by itself, a secondary light source that emits light by reflecting, refracting, or diffusing light emitted from the primary light source, a lighting unit that emits light from the primary light source, the primary light source, the secondary light source, and a lighting unit. An instrument body that is held and embedded in the ceiling surface,
The instrument body is formed in a box shape with an open bottom surface,
The said secondary light source consists of a light guide arrange | positioned at the opening edge of the said instrument main body, The lighting fixture characterized by the above-mentioned. A plurality of louvers that block a part of light emitted from the primary light source, and a louver frame that supports the louvers and is attached to an opening edge of the instrument body,
The lighting apparatus according to claim 1, wherein the louver frame is formed integrally with the light guide.   The lighting apparatus according to claim 1, wherein one or more high-luminance light emitting portions that increase the luminance of the secondary light source in a substantially horizontal direction are provided on the lower surface side of the light guide. The primary light source has two types, one that contributes to the light emission of the secondary light source and one that does not contribute to the light emission,
The lighting device according to any one of claims 1 to 3, wherein the lighting means individually emits the two types of primary light sources.

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