JP2010164810A - Illuminating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminating device that has high maintainability and performs efficient illumination. <P>SOLUTION: A light-emitting element 20 emits a luminous flux in the direction of the central part of a case 11 substantially in parallel with a light-emitting surface 13. A reflecting plate 12 includes: a first reflecting surface 12a disposed near the light-emitting element 20 and substantially parallel to the light-emitting surface 13; and a second light-emitting surface 15 disposed near the central part of the case 11 and forming a predetermined angle with the light-emitting surface 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an illuminating device that can perform efficient illumination with high maintainability.

  In recent years, high-intensity LED elements have been developed, and the use of LED elements for internal lighting such as outdoor signboards is increasing. The LED element has an advantage that it has a long life compared to an incandescent bulb and a fluorescent lamp, and can be dimmed. However, since the linearity of the light is high, when used as a light source, the LED element is It is necessary to properly guide the light in the intended direction.

As such an illuminating device, a diffusion layer is provided on the incident end face of the light guide plate, and the light emitted from the solid state light emitting element is diffused by the diffusion layer so as to be incident on the light guide plate from almost the entire area of the incident end face. A light source is disclosed (see Patent Document 1).
JP 2002-197916 A

  Conventionally, light emitted from the LED element is guided by a light guide plate. However, this light guide plate is made of an acrylic resin or the like, and its weight increases, and the cost for processing into a predetermined shape is not small.

  In particular, when such an illuminating device is applied to the internal lighting of an outdoor signboard, since the illuminating device is enlarged, the light guide plate is increased in size and weight, and the manufacturing cost and processing cost are increased.

  Furthermore, when the light guide plate is provided inside the lighting device, the number of work for replacement when the LED element breaks down increases. In particular, in a signboard installed at a high place, it is difficult to replace the LED element, and the maintainability is lowered.

  The present invention has been made in view of such problems, and relates to a large-sized lighting device used for internal lighting such as an outdoor signboard, etc., while ensuring luminance, low manufacturing cost, and high maintainability. An object is to provide a lighting device.

  The present invention provides a hollow box-shaped case, a light emitting element provided on the inner wall of the case, a light emitting surface provided on the ceiling of the case, and a bottom part of the case. A light-emitting element that irradiates a light beam substantially parallel to the light-emitting surface toward the central portion of the case, and the light-reflecting plate is provided in the vicinity of the light-emitting element. A first reflecting surface substantially parallel to the surface, and a second light emitting surface provided near the center of the case and having a predetermined angle with the light emitting surface.

  According to the present invention, the interior of the case is hollow, and a reflector having a simple structure is provided, so that the illumination device can be used by using the illumination device of the present invention for internal illumination such as a signboard installed at a high place, for example. Maintenance costs such as reduction in installation cost due to weight reduction and replacement of light emitting elements can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an explanatory diagram of a lighting device 10 according to an embodiment of the present invention.

  1A is a plan internal view of the lighting device 10, and FIG. 1B is a cross-sectional view.

  The lighting device 10 includes a case 11 having a hollow inside and having a box-shaped outer shape, and a plurality of LED modules 20 that are light emitting elements.

  The case 11 has a rectangular parallelepiped shape, and the surface of the ceiling portion is configured as a light emitting surface 13. By irradiating light from the light emitting surface 13, it functions as a light source such as a signboard.

  The bottom surface inside the case 11 is configured as a reflector 12 for reflecting the light emitted from the LED module 20 and guiding it to the light emitting surface 13 side.

  The reflecting plate 12 is provided on a flat reflecting surface 12a (first reflecting surface) and a central portion of the bottom surface of the case 11, and a protruding portion 15 (second reflecting surface) protruding toward the light emitting surface 13 side. And comprising.

  As for the projection part 15, the top part is a quadrangular pyramid shape, and the side surface is comprised in step shape. The protrusion 15 is configured to form a predetermined angle with respect to the luminous flux of the LED module 20. With such a structure, the reflecting plate 12 reflects the light flux from the LED module 20 from the LED module 20 side to the central portion side of the case 11 by several reflecting surfaces and guides it to the light emitting surface 13. It is configured.

  In the example illustrated in FIG. 1, the cross-sectional area of the protrusion 15 is configured to decrease stepwise. Specifically, the protrusion 15a, the protrusion 15b, and the protrusion 15c have a stepped structure from the bottom surface side.

  The LED module 20 includes one or more high-intensity light emitting diode (LED) elements. The LED module 20 is provided at each of the four corners of the inner wall of the case 11 and is installed so as to irradiate a light beam substantially parallel to the light emitting surface 13 toward the center of the case 11.

  Further, as shown in FIG. 1B, the opening of the case 11 is covered with a plate 30. The plate 30 is configured such that light emitted from the LED module 20 and reflected by the reflecting plate 12 is appropriately diffused so that the light emitting surface 13 of the lighting device 10 emits light with substantially uniform brightness. That is, this plate 30 becomes the light emitting surface 13 of the light emitting device 10.

  The LED module 20 irradiates the central direction of the case 11. At this time, in the vicinity of the LED module 20, a part of the luminous flux of the LED module 20 is reflected by the reflecting plate 12 of the case 11, and the part directly irradiates the plate 30. Thereby, the light emission surface 13 in the vicinity of the LED module 20 emits light.

  Further, most of the light flux from the LED module 20 is reflected by the protrusion 15 provided at the center of the case 11. At this time, the light beam is reflected from the projection 15a near the bottom surface side to the projection 15b and the projection 15c, and irradiates the plate 30. Thereby, the vicinity of the central portion of the light emitting surface 13 emits light.

  That is, the reflection plate 12 of the case 11 has a structure that reflects light stepwise from the side closer to the LED module 20 (projection 15a) to the side farther away (projection 15c).

  By configuring in this way, the reflector 12 can uniformly guide the light flux to the light emitting surface 13 side from the side closer to the LED module 20 as the light emitting source to the far side (near the center of the case 11). . Thereby, the illumination device 10 can emit light efficiently while suppressing the number of the LED modules 20 to be small.

  Further, there is no structure other than the LED module 20 and the protrusion 15 inside the lighting device 10. Therefore, even when the LED module 20 breaks down, the LED module 20 can be easily replaced by removing the plate 30, so that the maintenance cost can be reduced.

  In addition, the protrusion 15 can be formed from a flat plate by press working or the like, so that the number of parts can be reduced and the weight can be reduced.

  In addition, since the lighting device 10 can be reduced in weight and maintainability can be improved, by applying the lighting device 10 of the present embodiment to an internal lighting such as a sign pole or the like set at a high place, the maintainability is improved. High signage can be provided.

  1 shows an example in which the protrusion 15 has a three-stage structure, but the present invention is not limited to this, and a multi-stage structure may be used.

  FIG. 2 is another configuration example of the illumination device 10 according to the embodiment of the present invention.

  In the example shown in FIG. 1 described above, the projecting portion 15 is configured in a staircase shape, but in the example shown in FIG. 2, the projecting portion 15 has a cross-sectional area continuously extending from the bottom surface side toward the opening portion side. It was configured to become smaller.

  The shape of the projection 15 is, for example, a quadrangular pyramid or a cone.

  Thus, when the structure of the protrusion is further simplified, the processing cost of the protrusion 15 can be further reduced as compared to the example shown in FIG. And even if it is a case where it comprises in this way, the light emission surface 13 can be light-emitted evenly, without reducing the brightness | luminance of the illuminating device 10. FIG.

  FIG. 3 shows still another configuration example of the illumination device 10 according to the embodiment of the present invention.

  In the example shown in FIG. 3, an auxiliary LED 22 that emits auxiliary light is provided in the vicinity of the center of the protrusion 15.

  Unlike the LED module 20, the auxiliary LED 22 is configured to irradiate a light beam toward the light emitting surface 13 side.

  The auxiliary LED 22 does not need to be as bright as the LED module 20, and can be an inexpensive LED with low brightness.

  With this configuration, even if the configuration shown in FIGS. 1 and 2 is used, the light emitted from the illumination device 10 is emitted by the luminous flux of the auxiliary LED 22 when the luminance near the center of the illumination device 10 is insufficient. The luminance of the surface 13 can be increased, and the light emitting surface 13 can emit light evenly.

  In the example shown in FIG. 3, the five auxiliary LEDs 22 are provided. However, the position and location of the auxiliary LEDs 22 can be appropriately determined according to the luminance distribution of the light emitting surface 13.

  Similarly to FIG. 2 described above, the projecting portion 15 may not be stepped, and the cross-sectional area may be continuously reduced (FIG. 4). In this case, the protrusion 15 has, for example, a quadrangular frustum shape or a truncated cone shape, and includes an auxiliary LED 22 on the top of the base.

  Even when the auxiliary LED 22 is provided as shown in FIGS. 3 and 4, since the inside of the case 11 is hollow, maintenance work of the LED module 20 and the auxiliary LED 22 is not sacrificed.

  FIG. 5 shows still another configuration example of the illumination device 10 according to the embodiment of the present invention.

  In the example shown in FIG. 5, the protrusion 15 is configured in a stepped manner so that the cross-sectional area thereof becomes smaller in steps as in FIG. 1.

  Further, in the example shown in FIG. 5, the side surface of the protrusion 15 is configured to be perpendicular to the luminous flux of the LED module 20.

  By comprising in this way, the light beam from LED module 20 can be reflected more efficiently, and the brightness | luminance of the illuminating device 10 can be made high.

  Note that the protrusion 15 may have a quadrangular pyramid shape as shown in FIG. 2 so that its side surface is perpendicular to the luminous flux of the LED module 20.

  Further, as shown in FIGS. 3 and 4, an auxiliary LED 22 may be provided on the top of the protrusion 15.

  As described above, the embodiment of the present invention includes the LED module 20 that is a light emitting element and the reflection plate 12 inside the illumination device 10, and the reflection plate 12 is provided in the vicinity of the LED module 20. The reflecting surface 12a and the second reflecting portion (projecting portion 15) provided near the center of the case 11 and having a predetermined angle with the light emitting surface 13.

  With such a configuration, the luminance of the light emitting surface 13 can be ensured with a small number of LED modules 20 without providing a light guide plate that is heavy and expensive in the case 11, thereby reducing the weight of the lighting device 10. In addition, the manufacturing cost and the maintenance cost can be reduced.

  In particular, the inside of the case 11 is hollow except for the projection 15 of the reflector 12 being formed. Therefore, even when the LED module 20 fails, the case 11 can be easily replaced simply by removing the plate 30. Thereby, maintenance cost can be reduced.

  Further, since the protrusion 15 has a simple structure, the number of parts used can be reduced by forming it by press working or the like, and thus the manufacturing cost can be reduced.

  In addition, the illuminating device 10 of this embodiment is provided with the LED module 20 which consists of an LED element as a light emitting element, and can perform light control. For example, you may provide the control apparatus which detects illumination intensity using the illumination intensity sensor which detects surrounding environmental illumination intensity, and adjusts the brightness | luminance of the illuminating device 10 based on this illumination intensity. With this configuration, control is performed such that the luminance of the lighting device 10 is increased in the daytime to increase the visibility while the luminance of the lighting device 10 is decreased in the nighttime to prevent a decrease in visibility due to halation. be able to.

It is explanatory drawing of the illuminating device of embodiment of this invention. It is explanatory drawing of the other example of the illuminating device of embodiment of this invention. It is explanatory drawing of the further another example of the illuminating device of embodiment of this invention. It is explanatory drawing of the further another example of the illuminating device of embodiment of this invention. It is explanatory drawing of the further another example of the illuminating device of embodiment of this invention.

DESCRIPTION OF SYMBOLS 10 Illuminating device 11 Case 12 Reflecting plate 12a Reflecting surface (1st reflecting surface)
13 Light Emitting Unit 15 Projection (First Projection)
20 LED module 22 Auxiliary LED element 30 Plate

Claims (6)

A hollow box-shaped case; a light emitting element provided on an inner wall of the case; a light emitting surface provided on one surface of the case; and an inner wall of a surface facing the one surface, A reflector that reflects the luminous flux of the element toward the light emitting surface, and a lighting device comprising:
The light emitting element irradiates a light beam substantially parallel to the light emitting surface in the central portion direction of the case,
The reflection plate includes a first reflection surface provided in the vicinity of the light emitting element, and a second reflection surface provided in the vicinity of a central portion of the case and forming a predetermined angle with the light emission surface. Lighting device.   The lighting device according to claim 1, wherein the light emitting element is provided at each of the four corners of the case.   The lighting device according to claim 1, further comprising a second light emitting element that irradiates the light emitting surface with a light beam on the second reflecting surface.   2. The reflection plate is provided with a protrusion protruding in the shape of a cone toward the light emitting surface in the vicinity of the center thereof, and a side surface of the cone is the second reflection surface. The lighting device according to any one of 3 to 3.   The lighting device according to claim 4, wherein the protrusion has a quadrangular pyramid shape.   The projecting portion has a structure in which quadrangular pyramid shapes are stacked so that the cross-sectional area gradually decreases toward the light emitting surface, and the side surface of the quadrangular pyramid shape is the second side. The illumination device according to claim 4, wherein the illumination device is a reflective surface.

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