JP2009080993A - Surface light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface light emitting device capable of brightly illuminating the floor near feet without brightening the front more than needed. <P>SOLUTION: The edge light type surface light emitting device mounted on a wall 2 includes a light reflection part 4, a light guide plate 5 disposed along the front face of the light reflection part 4, a light transmitting part 6 disposed along the front face of the light guide plate 5 and a light source 7 disposed above an upper end face of the light guide plate 5. A lower end face of the light guide plate 5 is exposed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a surface light emitting device installed on a wall of a building.

  Conventionally, as a surface light-emitting device installed on the wall of a building, there is one using an edge light type surface light-emitting device. A general edge light type surface light emitting device 1 shown in FIG. 4 includes a light reflecting portion 4, a light guide plate 5, a light diffusing portion 10, and a light transmitting portion 6 in order from the wall 2 side. By irradiating light toward the end surface of the light guide plate 5 from the front surface of the light guide plate 5 while the light introduced from the end surface of the light guide plate 5 is reflected by the front and rear surfaces of the light guide plate 5 and the rear light reflecting portion 4 As a result, the entire front surface of the light guide plate 5 emits light. In addition, as shown in FIG. 5, the surface light emitting device emits light toward the front for the purpose of improving the front luminance, so that the light diffusing unit 10 composed of a diffusion sheet or a prism sheet is provided on the front surface of the light guide plate 5. Or the lower plate portion 4c protruding forward and provided at the lower end portion of the light reflecting portion 4 covers the lower end surface of the light guide plate 5.

  However, since the surface light emitting device is configured to emit light forward from the light transmitting portion 6, the floor 9 at the foot cannot be illuminated brightly. Further, if the output of the light source 7 is increased, it is possible to brightly illuminate the feet, but in this case, the illuminance to the front becomes higher than necessary, and a person who sees it at night is likely to wake up. For this reason, the surface emitting device is not suitable when, for example, illumination of a relaxing space such as a bedroom is performed.

Further, for example, Patent Document 1 discloses a surface light-emitting device in which a light transmission portion is provided along the front surface of a light guide plate. This device introduces light from a light source from the upper end surface of the light guide plate. Light is emitted obliquely downward from the front surface of the light plate, and further, the light diffusing unit 10 is omitted so that light emitted obliquely downward from the front surface of the light guide plate directly reaches the light transmitting portion, Thereby, it is comprised so that light may radiate | emit toward diagonally forward downward from a light transmissive part. Therefore, the illuminance at the foot can be increased somewhat compared with that of FIG. 4, but the illuminance at the foot is still low and there is room for improvement.
JP 2006-156050 A

  This invention is made | formed in view of the said conventional problem, Comprising: It aims at providing the surface light-emitting device which can illuminate the floor of a leg brightly, without raising the illumination intensity of a front more than necessary. .

  In order to solve the above-described problem, a surface light-emitting device according to claim 1 of the present invention is an edge-light-type surface light-emitting device installed on the wall 2, along the light reflecting portion 4 and the front surface of the light reflecting portion 4. A light guide plate 5 provided, a light transmission portion 6 provided along the front surface of the light guide plate 5, and a light source 7 disposed above the upper end surface of the light guide plate 5, with the lower end surface of the light guide plate 5 exposed. It is characterized by comprising.

  The surface light emitting device according to claim 2 is an edge light type surface light emitting device installed on the wall 2, and includes a light reflecting portion 4, a light guide plate 5 provided along the front surface of the light reflecting portion 4, and a light guide. An inclined plate provided with a light transmitting portion 6 provided along the front surface of the light plate 5 and a light source 7 disposed above the upper end surface of the light guide plate 5, and projecting obliquely forward and downward at the lower end portion of the light reflecting portion 4. A portion 4 b is provided, and the inclined plate portion 4 b is located below the lower end surface of the light guide plate 5 via a gap 8.

  In the invention according to the first and second aspects, the light from the light source 7 is introduced from the upper end surface of the light guide plate 5 by disposing the light source 7 above the upper end surface of the light guide plate 5. Thereafter, the light travels downward through the inside of the light guide plate 5, and then light is emitted obliquely forward and downward from the front surface of the light guide plate 5. Further, since the light transmission part 6 is provided along the front surface of the light guide plate 5, the light emitted from the front surface of the light guide plate 5 obliquely forward and downward is directly directed to the light transmission part 6 without changing the direction. Will be reached. For this reason, light can be emitted from the light transmitting portion 6 obliquely forward and downward.

  Furthermore, since the lower end surface of the light guide plate 5 is exposed, light can be emitted from the lower end surface of the light guide plate 5 downward.

  Further, in claim 2, the light emitted obliquely forward and downward from the lower end surface of the light guide plate 5 can be emitted as it is to the floor 9 side through the gap 8, and from the lower end surface of the light guide plate 5. The light emitted toward the lower side can be reflected toward the floor 9 on the front surface facing obliquely above the inclined plate portion 4b. Moreover, it becomes possible to obtain the target floor illumination by adjusting the inclination angle of the inclined plate portion 4b.

  In Claim 1 and Claim 2 of this invention, by arrange | positioning a light source above a light-guide plate, light can be radiate | emitted diagonally downward from the front surface of a light-guide plate, Thereby, the front is made more than necessary. You can illuminate the floor of your feet without making it brighter.

  Moreover, in Claim 1, since the lower end surface of the light guide plate is exposed, light is emitted from the lower end surface of the light guide plate toward the floor side, and this light is applied to the floor surface to further increase the floor of the foot. The surface can be illuminated brightly.

  According to the second aspect of the present invention, the light emitted obliquely forward and downward from the lower end surface of the light guide plate can be irradiated to the floor side as it is through the gap, and the lower end surface of the light guide plate is directed downward. The light emitted in this manner can be reflected on the floor side by the front surface facing obliquely upward of the inclined plate portion, and the floor surface of the foot can be illuminated more brightly with these lights. Moreover, it becomes possible to obtain the target floor illumination by adjusting the inclination angle of the inclined plate portion.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. As shown in FIG. 2, the surface light emitting device 1 of this example is installed on a wall 2 of a building for the purpose of display, production, or lighting indoors or outdoors, and for example, a room that forms a relaxing space such as a bedroom. It is installed on the wall. Note that the directions used in the following description of the surface light emitting device 1 are based on the state where the surface light emitting device 1 is installed on the wall 2, and the wall side is the rear and the side opposite to the wall is the front.

  As shown in FIG. 1, the surface light emitting device 1 includes a light reflecting portion 4, a light guide plate 5 provided along the front surface of the light reflecting portion 4, a light transmitting portion 6 provided along the front surface of the light guide plate 5, A light source 7 disposed at a position facing the upper end surface of the light guide plate 5, and the light reflecting portion 4, the light guide plate 5, the light transmitting portion 6, and the mounting frame 3 that holds the light source 7 inside are provided.

  The light reflecting portion 4 is composed of a U-shaped reflecting plate that opens forward and downward, and has a rectangular back plate portion 4a and side plate portions projecting forward from both side ends of the back plate portion 4a ( The inner surface of the light reflecting portion 4, that is, the front surface of the back plate portion 4a and the inner surfaces of the side plate portions on both sides are reflecting surfaces.

  Both the light guide plate 5 and the light transmission part 6 are formed in a rectangular shape in front view. The rear surface of the light guide plate 5 is directly attached to the front surface of the back plate portion 4a of the light reflecting portion 4, and the upper end surface of the light guide plate 5 is the entrance surface 5a, and the front surface is the main exit surface 5b. The light transmitting portion 6 is obtained by applying a pattern (not shown) such as a wood grain pattern to a light transmitting plate such as acrylic resin having a light transmitting property, and its rear surface is directly attached to the front surface of the light guide plate 5. . The pattern of the light transmitting portion 6 is formed by printing on the surface of the base material or pasting a sheet. The handle pattern has translucency that is lower than that of the base material. When the light guide plate 5 emits light, a part of the light emitted from the front surface of the light guide plate 5 is transmitted through the handle pattern as if light is emitted from the handle pattern. Is emitted. Further, when the light guide plate 5 is not emitting light, the light guide plate 5 and the reflection plate inside the mounting frame 3 are difficult to see due to the pattern.

  When light is incident from the upper end surface of the light guide plate 5 as described above, the upper side of the light guide plate 5 is likely to emit light brighter. The property and shape of the light guide plate 5 in the vertical direction are changed so that the light derivation rate from the light is increased, or a light guide print pattern is applied to the front surface of the light guide plate 5. The light may be emitted uniformly from the light source.

  The light source 7 is disposed inside the upper end portion of the mounting frame 3, and is provided only at a position corresponding to one side constituted by the upper end surface among the four sides of the rectangular light guide plate 5. The light source 7 is composed of a plurality of light emitting diodes (LEDs) arranged side by side in the longitudinal direction of the incident surface 5a of the light guide plate 5, and is provided in a range extending over the entire length of the incident surface 5a. The light source 7 is not limited to the point light source, and may be composed of one or more linear light sources (straight tube lamps) disposed in parallel above the upper end surface of the light guide plate 5.

  Here, the back surface and both side end surfaces of the light guide plate 5 are covered with the back plate portion 4 a and the side plate portions of the light reflecting portion 4, respectively, but the lower end surface of the light guide plate 5 is covered with the light reflecting portion 4. Absent. The mounting frame 3 opens downward, and the lower end surface of the light guide plate 5 is not covered by the mounting frame 3. That is, the lower end surface of the light guide plate 5 is exposed downward through the lower end opening of the mounting frame 3, and a member that blocks light derived downward from the lower end surface of the light guide plate 5 below the same surface. There is no. Further, in the illustrated example, the lower end portion of the back plate portion 4a of the reflecting portion 4 protrudes downward from the light guide plate 5, and light emitted from the lower end surface of the light guide plate 5 obliquely downward downward is emitted from the back plate portion 4a. It is made to reflect toward the front diagonally lower side at the front surface of the lower end portion.

  In order to install the surface light emitting device 1 on the wall 2, an arbitrary height position away from the floor 9 on the wall surface 2a (the outer surface of the wall 2 on the illumination space side) so that the light source 7 is positioned above the mounting frame 3. The light reflection portion 4, the light guide plate 5, and the light transmission portion 6 stacked in this order from the wall 2 side are arranged in parallel along the wall surface 2a, and the light source 7 is disposed above the upper end surface of the light guide plate 5. Deploy.

  When light is emitted from the light source 7 (each point light source) in the surface light emitting device 1 installed on the wall 2 as described above, the light from the light source 7 is guided through the incident surface 5a (upper end surface) of the light guide plate 5. The light is introduced into the light plate 5 and then travels downward through the inside of the light guide plate 5 while being reflected by the front and rear surfaces of the light guide plate 5 and the front surface of the back plate portion 4a of the light reflecting portion 4 at the rear. Light gradually leaks from the upper end to the lower end side of the front surface of the light guide plate 5, whereby substantially the entire light guide plate 5 emits light. Thus, the light emitted from the front surface of the light guide plate 5 directly enters the rear surface of the light transmission part 6, and a part of the light passes through the pattern of the light transmission part 6 and the other part does not have a pattern. After passing through, the light is emitted from the front surface of the light transmitting portion, so that substantially the entire light transmitting portion 6 emits light in a planar shape, and indirect illumination is performed using the emitted light as illumination light.

  Further, as described above, when the surface light emitting device 1 of this example emits light, the light from the light source 7 is introduced from the upper end surface of the light guide plate 5 and travels downward in the light guide plate 5. From the front surface of the light, light having a directivity of obliquely forward and downward is emitted. In addition, since the light transmission part 6 is provided along the front surface of the light guide plate 5 in this example, the light emitted from the front surface of the light guide plate 5 diagonally forward and downward is directed to the light transmission part 6 without changing the direction. Directly, and when passing through the light transmission part 6, the direction is hardly changed. For this reason, the light finally derived from the light transmitting portion 6 is emitted obliquely forward and downward as shown in FIG. 5, whereby the floor surface of the foot can be illuminated brightly. Moreover, since the lower surface of the light guide plate 5 is exposed in the surface light emitting device 1 of this example, in addition to the emission of light from the front surface of the light guide plate 5 as illumination light as shown in FIG. Light can be emitted toward the lower side, and the floor 9 can be illuminated brightly by applying this light to the floor surface.

  Next, another example of the surface light emitting device 1 different from the above example of the surface light emitting device 1 will be described. In the following description, the same components as those of the surface light emitting device 1 of the example are given the same numbers, and redundant descriptions are omitted.

  The surface light emitting device 1 of this example shown in FIG. 3 is an inclined plate portion that projects the lower end portion of the light reflecting portion 4 downward and obliquely downward by bending the lower end portion of the back plate portion 4a of the light reflecting portion 4. 4b is formed, and the inclined plate portion 4b provided at the lower end portion of the light reflecting portion 4 is positioned below the lower end surface of the light guide plate 5 with a gap 8 therebetween.

  As described above, when the surface light emitting device 1 emits light, light emitted from the lower end surface of the light guide plate 5 diagonally forward and downward is irradiated to the floor 9 side as it is through the gap 8, or the light guide plate 5 The light emitted downward from the lower end surface can be reflected diagonally forward and downward by the front surface facing obliquely upward of the inclined plate portion 4b, and in this example as well, the floor of the foot can be illuminated brightly. Furthermore, in this example, it is possible to obtain the desired floor illumination by adjusting the inclination angle of the inclined plate portion 4b.

  In addition, although the surface emitting device 1 of each said example attached the attachment frame 3 to the wall surface 2a, you may embed the rear end part or all of the attachment frame 3 in the wall 2. FIG.

It is explanatory drawing which showed typically the cross section of the surface emitting device of an example of embodiment of this invention. It is explanatory drawing which shows the irradiation direction of the light of the surface emitting device same as the above. It is explanatory drawing which showed typically the cross section of the surface emitting device of another example. It is explanatory drawing which showed the cross section of the conventional surface emitting device typically. It is explanatory drawing which shows the irradiation direction of the light of the surface emitting device same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Surface light-emitting device 2 Wall 4 Light reflection part 4b Inclination board part 5 Light guide plate 6 Light transmission part 7 Light source

Claims (2)

  In an edge light type surface light emitting device installed on a wall, a light reflecting portion, a light guide plate provided along the front surface of the light reflecting portion, a light transmitting portion provided along the front surface of the light guide plate, A surface light emitting device comprising a light source disposed above an upper end surface and exposing a lower end surface of a light guide plate.   In an edge light type surface light emitting device installed on a wall, a light reflecting portion, a light guide plate provided along the front surface of the light reflecting portion, a light transmitting portion provided along the front surface of the light guide plate, Provided with a light source disposed above the upper end surface, provided at the lower end portion of the light reflecting portion with an inclined plate portion projecting obliquely downward in the front direction, and placing the inclined plate portion below the lower end surface of the light guide plate via a gap A surface light emitting device characterized by being positioned.