JP2014002962A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire which can emit light even in a side face direction or back direction and is easy to manufacture.SOLUTION: A luminaire includes a light source 3, a housing 2 which supports the light source and has an opening 8 for emitting light, and a prism 5 provided to the opening of the housing. The prism is provided at a position on which at least part of a light beam emitted within a range of a latitude angle of 0-30 degrees from the light source is incident, where the latitude angle is defined so that the forward direction of the light source is at 90 degrees, the side face direction is at 0 degrees, and the back direction is at -90 degrees.

Description

  Embodiments described herein relate generally to a lighting device.

  In general, the lighting device is installed on the ceiling to irradiate a room or office, but a brighter impression can be given by irradiating not only the floor or work desk but also the entire environment such as the ceiling and wall. In order to perform such irradiation, conventionally, there is a technique in which a three-dimensional milky white cover protruding from the ceiling is employed and the ceiling or the like is irradiated with light scattered from the cover.

  On the other hand, the light directly entering the eyes from the lighting device is too bright and feels dazzling. In particular, the light that is obliquely irradiated in the range of 0 to 30 degrees from the ceiling is an angle at which a person naturally enters the eye without looking up the lighting device, and it is desirable to suppress this light.

  In a downlight or the like, a lighting device is embedded in the ceiling so that the light source cannot be seen from an oblique direction. With such a configuration, the glare can be suppressed, but the ceiling cannot be irradiated.

  In addition, a technique has been proposed in which a light source is not seen obliquely with a light shielding plate called a louver, baffle, or louver. In these, a plurality of light shielding plates standing in a vertical direction on the ceiling are arranged so that the light source cannot be seen from an oblique direction. However, such a lighting device still has a problem that ceiling illumination cannot be performed.

Japanese Patent Laid-Open No. 04-87204

  This invention is made | formed in view of the above point, The subject is providing the illuminating device which enabled it to irradiate a ceiling side etc., without increasing glare.

  According to the embodiment, the lighting device includes a light source, a housing having an opening that supports the light source and emits light, and a prism provided in the opening of the housing. When the latitude angle is 90 degrees in front of the light source, 0 degrees in the side surface direction, and -90 degrees in the back surface direction, at least a part of the light rays emitted from the light source in the range of 0 to 30 degrees latitude is incident. In the position.

FIG. 1 is a perspective view showing an appearance of a downlight type illumination device according to a first embodiment. FIG. 2 is a cross-sectional view of the lighting device showing a state where the lighting device is installed on the ceiling. FIG. 3 is a view showing a ray trajectory irradiated from the illumination device. FIG. 4 is a diagram illustrating a range in which glare is felt. FIG. 5 is a perspective view showing an appearance of an embedded base light type illumination device according to a second embodiment. FIG. 6 is a cross-sectional view of the embedded base light type illumination device according to the second embodiment. FIG. 7 is a diagram illustrating a ray trajectory irradiated from the illumination device according to the second embodiment. FIG. 8 is a cross-sectional view of a pasted base light type illumination device according to a third embodiment.

Hereinafter, illumination devices according to various embodiments will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 shows an appearance of a downlight type illumination device according to the first embodiment, and FIG. 2 is a cross-sectional view of the illumination device showing a state of being installed on a ceiling.

  The illuminating device 1 is embedded in the ceiling surface, and has the form which rotated the cross section shown in figure on the central axis. The lighting device 1 is provided in the housing 2 so as to face the light source 3 and a housing 2 formed in a cup shape with a flat bottom, a light source 3 composed of a plurality of LEDs mounted on the bottom of the housing. A transparent cover 4 and a prism 5 supported by the housing 2 are further provided.

  The housing 2 is made of, for example, metal and has a conical portion that forms a reflector, a bottom portion on which the light source 3 is mounted, and a lower end opening 8 that faces the light source 3 and emits light. A mounting substrate 6 is fixed to the bottom of the housing 2, and the light source 3 including a plurality of LEDs is mounted on the mounting substrate 6.

  The prism 5 is formed in an annular shape centering on the light source 3 that is a point light source, and is coaxially fixed to the peripheral edge portion of the lower end opening 8 of the housing 2. Further, the cover 4 is fixed to the prism 5 so as to cover the lower end opening 8 of the housing 2. The cover 4 is not limited to the opening 8 and may be provided in the housing 2 so as to face the light source 3 directly below.

  When the lighting device 1 is installed on the ceiling, as shown in FIG. 2, the housing 2 is embedded in the ceiling 10, and the lower end opening 8 thereof is positioned substantially flush with the ceiling surface. Further, the prism 5 is exposed downward from the ceiling surface and is disposed substantially parallel to the ceiling surface.

  When the latitude angle is 90 degrees in front of the light source 3, 0 degrees in the side surface direction and −90 degrees in the back surface direction, the prism 5 has at least light rays emitted from the light source 3 in the range of latitude angles 0 to 30 degrees. It is provided at a position where a part is incident. 2 and 3, the prism 5 has an entrance surface 5a, an exit surface 5b, and a connection surface 5c. The prism 5 refracts light incident on the entrance surface 5a from the light source 3 and enters the ceiling 10 from the exit surface 5b. It has a function to irradiate widely. That is, the prism 5 is formed so as to emit incident light at a latitude angle of 0 to −30 degrees.

  In the present embodiment, the prism 5 uses light having an angle in the range of 0 to 30 degrees from the ceiling 10 as light that is directly emitted from the light source 3 as main incident light, and other light is an annular prism. 5 is configured to irradiate directly downward through the center of 5.

  A part of the light emitted from the light source 3 is slightly incident on the connection surface 5c of the prism 5 as indicated by a broken line in the figure. Designed to emit. That is, the prism 5 is configured to emit light incident on the connection surface 5c at a latitude angle of 30 degrees or more.

  In order to irradiate the ceiling 10 more widely, the angle formed by the emitted light beam with the ceiling 10 is preferably 0 to −30 degrees. For this reason, the light from the light source 3 that passes through the prism 5 is only light that is 30 degrees or more at an angle from the ceiling 10, and the main light that is incident on the prism 5 can be widely irradiated on the ceiling surface. And a lighting device that does not cause glare.

FIG. 4 is a diagram for explaining an angle at which glare is felt.
If the angle is less than 30 degrees from the ceiling 10, it will naturally enter the human eye, so if direct light from the light source is radiated in this angle range, you will feel dazzling.

  In the illuminating device 1 according to the first embodiment described above, light that is mainly irradiated in this angle range (an angle smaller than 30 degrees from the ceiling 10) is taken into the prism 5 and irradiated toward the ceiling 10 side. Yes, a bright space can be realized without increasing glare.

  In the first embodiment, considering the illuminance balance between the direct downward direction and the ceiling side, the angle range of the light that the prism 5 captures and irradiates the ceiling 10 side is set to within 30 degrees. 5 and the ceiling 10 side may be strongly irradiated. On the contrary, you may irradiate the ceiling side weakly.

  The prism 5 can be configured to irradiate not only in the ceiling side irradiation but also in the direct downward direction. In the embodiment described above, when the ceiling 10 side is too bright, the prism 5 refracts light in an angle range of 0 to 20 degrees, for example, and blocks light in an angle range of 20 to 30 degrees by the prism 5. It may also be formed so as to irradiate in the downward direction.

  Next, a lighting device according to another embodiment will be described. In the various embodiments described below, the same parts as those in the first embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and different parts will be described in detail.

(Second Embodiment)
FIG. 5 shows an appearance of the lighting device according to the second embodiment, and FIG. 6 is a cross-sectional view of the lighting device showing a state where the lighting device is installed on the ceiling.

  The illuminating device 1 is embedded in the ceiling surface, and has the form which extended the cross section shown in the orthogonal direction. The lighting device 1 includes a rectangular housing 2, a light source 3 composed of a plurality of LEDs mounted on the bottom of the housing, a transparent cover 4 provided on the housing 2 so as to face the light source 3, and And a prism 5 supported by the housing 2.

  The housing 2 is made of, for example, metal, has a flat rectangular bottom wall and a low-side wall erected on the periphery of the bottom wall, and has a rectangular lower end opening 8. . A mounting substrate 6 is fixed to the bottom of the housing 2, and the light sources 3 including a plurality of LEDs are mounted on the mounting substrate 6 in a straight line. The plurality of light sources 3 are arranged along the longitudinal direction of the housing 2.

  The prisms 5 are formed in an elongated plate shape, are respectively fixed to both side edges of the housing 2, and extend in parallel with both side edges of the lower end opening 8. Further, the cover 4 is fixed to the prism 5 so as to cover the lower end opening 8 of the housing 2. The cover 4 is not limited to the opening 8 and may be provided in the housing 2 so as to face the light source 3 directly below.

  When the lighting device 1 is installed on the ceiling, as shown in FIG. 6, the housing 2 is embedded in the ceiling 10, and the lower end opening 8 thereof is positioned substantially flush with the ceiling surface. Further, the two prisms 5 are exposed downward from the ceiling surface and are arranged substantially parallel to the ceiling surface.

  The side wall of the housing 2 is formed shallow, and both prisms 5 are disposed at positions where light emitted from the light source 3 to the ceiling 10 in an angle range of 0 to 30 degrees is incident. Each prism 5 has a plurality of prism regions whose sections protrude in a wedge shape, and these prism regions extend in parallel to each other and in parallel to the side edge of the lower end opening 8. Each prism region has an inclined entrance surface 5a, exit surface 5b, and total reflection surface 5d. As shown in FIGS. 6 and 7, the prism 5 refracts the light incident from the incident surface 5a, totally reflects it by the total reflection surface 5d, and emits it toward the ceiling 10 side from the emission surface 5b. That is, the prism 5 emits light at an angle of 0 to −30 degrees.

  According to the illuminating device 1 configured as described above, the light incident on the prism 5 can be widely irradiated on the ceiling surface, and an illuminating device that irradiates the ceiling brightly and does not cause glare can be obtained. Further, according to the present embodiment, the prism 5 is subdivided into a plurality of prism regions, so that the entire prism can be made thin, and mass productivity can be improved.

(Third embodiment)
FIG. 8 is a cross-sectional view showing an illumination device according to the third embodiment.

  The illuminating device 1 is configured to be attached to a ceiling surface without being embedded in the ceiling 10, and has a configuration in which the illustrated cross section is extended in a direction orthogonal to each other.

  The lighting device 1 includes a plate-shaped housing 2, a light source 3 composed of a plurality of LEDs mounted on the housing, a translucent cover 4 provided on the housing 2 so as to face the light source 3, Furthermore, a prism 5 formed integrally with the cover 4 is provided.

  The housing 2 is formed of, for example, a metal plate, the central portion thereof forms a protruding portion that protrudes downward, and flat mounting surfaces are formed on both sides of the protruding portion. The plurality of light sources 3 are symmetrically arranged on the mounting surface on both sides of the protrusion, and are provided in a straight line along the longitudinal direction of the housing 2. Moreover, the housing | casing 2 has the opening which discharge | releases the light from a light source to the exterior, respectively, In this embodiment, the space facing a mounting surface forms these openings.

  The pair of covers 4 are provided on both sides of the central protrusion of the housing 2 so as to cover the light source 3 and the opening, and are attached to the housing 2. Each cover 4 is integrally formed with the prism by, for example, extrusion molding.

  The prism of each cover 4 includes a ceiling irradiation prism 22 and a direct irradiation prism 24. The ceiling irradiation prism 22 is disposed at a position where light emitted from the light source 3 to the ceiling 10 in an angle range of 0 to 15 degrees is incident. The ceiling irradiation prism 22 has a plurality of prism regions whose sections protrude in a wedge shape on the inner surface side of the cover 4, and these prism regions refract incident light and emit it toward the ceiling 10 side. That is, the ceiling irradiation prism 22 emits light at an angle of 0 to −30 degrees.

  The direct irradiation prism 24 is disposed at a position where light emitted from the light source 3 with respect to the ceiling 10 is incident in an angle range of 15 to 30 degrees and a position where light emitted in an angle range of 30 degrees or more is incident. Has been. Light emitted in an angle range of 15 to 30 degrees is incident on one of the direct irradiation prisms 24 and is irradiated at an angle of 30 degrees or more directly below. The light incident on the other directly underneath irradiating prism 24 is refracted by this prism 24 and is radiated to the immediately lower side at an angle of 30 degrees or more.

  Also in the third embodiment configured as described above, it is possible to obtain an illumination device that irradiates the ceiling brightly without dazzling.

The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.
In the above-described embodiment, the LED is used as the light source. However, the light source may be an existing fluorescent lamp or another light source. Further, only the prism portion may be removable, and a prism with various ceiling illumination ratios may be selectively replaced as an accessory after the lighting device is installed. The lighting device described above may be installed not only on the ceiling of the room but on the side wall.

DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 2 ... Housing | casing, 3 ... Light source, 4 ... Cover, 5 ... Prism, 5a ... Incident surface,
5b: exit surface, 10: ceiling, 22 ... ceiling irradiation prism, 24 ... direct irradiation prism

Claims (6)

A light source;
A housing having an opening for supporting the light source and emitting light;
A prism provided in the opening of the housing,
The prism has a latitude angle of 90 degrees in front of the light source, 0 degrees in the side surface direction, and -90 degrees in the back surface direction. An illumination device provided at a position where a part of the light enters.   The illumination device according to claim 1, wherein the prism emits incident light at a latitude angle of 0 to −30 degrees.   The illumination device according to claim 1, wherein the prism emits incident light at a latitude angle of 30 degrees or more.   The lighting device according to claim 1, wherein the prism is configured by arranging a plurality of prisms.   The lighting device according to claim 1, wherein the light source is a point light source, and the prism is formed in an annular shape centering on the light source.   5. The illumination device according to claim 1, wherein the light source is a light source arranged in a line, and the prism is formed in a rod shape extending in parallel with the light source.

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