JP4966145B2 - Surface emitting device - Google Patents

Description

  The present invention relates to an edge light type surface light emitting device that derives light introduced from an end face of a light guide plate from one side.

  2. Description of the Related Art Conventionally, an edge light type surface light emitting device installed on a wall or ceiling of a building is known for the purpose of display, production, and light indoors and outdoors. For example, an edge light type surface light emitting device disclosed in Patent Document 1 includes a light guide plate and a fluorescent lamp provided along an end surface of the light guide plate, and irradiates light from the fluorescent lamp to an end surface of the light guide plate. The light introduced from the end surface of the light guide plate is led out from one side of the light guide plate to emit light from substantially the entire light guide plate.

However, since the surface light emitting device shown in Patent Document 1 includes only one fluorescent lamp, the light emission color of the light guide plate is limited to one color that is the light emission color of the fluorescent lamp, and the user's preference. It is not possible to change the light emission color of the light guide plate according to the production, daily life, biological rhythm, and the like.
Japanese Patent Laid-Open No. 2001-236809

  The present invention has been made in view of the above-described conventional problems, and the light emission color of the light guide plate can be changed according to the user's preference and production, daily life, biological rhythm, etc. at a low cost with a simple configuration. It is an object to provide a surface light emitting device.

In order to solve the above problems, the surface light emitting device according to the present invention is an edge light type illumination device that derives light introduced from the end surface of the light guide plate 1 from one side, and a white point light source 5a having a white emission color as a light source. these point sources 5a with luminous color comprises an orange point light source 5b orange, 5b and juxtaposed in the longitudinal direction of the end face of the light guide plate 1, the light emission color of the light guide plate 1 is only the white point light source 5a so that the white The state of emitting light, the state of emitting only the orange point light source 5b so that the light emission color of the light guide plate 1 is orange, and the white point light source 5a and the light emission color of the light guide plate 1 are intermediate colors of white and orange. A light emitting light source selecting means for switching between a state in which the orange point light source 5b emits light and light emitted from both point light sources 5a and 5b is mixed is provided. With this configuration, the light source selection unit emits only the white point light source 5a and causes the light guide plate 1 to emit white light, or emits both the white point light source 5a and the orange point light source 5b. The light plate 1 can emit light in a light bulb color, or only the orange point light source 5b can emit light and the light guide plate 1 can emit light in orange.

A second aspect of the present invention is the first aspect of the present invention, wherein the light source selection unit includes a state in which only the white point light source 5a emits light, a state in which only the orange point light source 5b emits light, the white point light source 5a and the orange point light source. An operation unit 8 for manually changing the state in which the light source 5b emits light is provided. Thereby, the light emission color of the light guide plate 1 can be changed by operating the operation unit 8.

Further, according to a third aspect of the present invention, in the first aspect , the light source selection unit includes a state in which only the white point light source 5a emits light, a state in which only the orange point light source 5b emits light, the white point light source 5a and the orange point light source. It is characterized by comprising control means for automatically changing the state in which the light source 5b emits light according to the time. Thereby, the light emission color of the light-guide plate 1 can be changed according to time by the control means.

In the invention according to claim 1, by the simple configuration of the light emitting color is juxtaposed these point sources in the longitudinal direction of the end face of the light guide plate with light emitting color and white white point light source comprises a orange point source of orange, white Only the point light source emits light and the light guide plate has a bright feeling and emits white light with morning and noon images, or both the white point light source and the orange point light source emit light and the light guide plate is warm and has a high quality texture. It can emit light in the color of a light bulb that has an image of a certain night and evening, or it can emit only an orange point light source and emit light in orange, which makes it difficult to wake up, and the light emission color of the light guide plate according to the time zone The light emission color of the light guide plate can be changed according to the user's preference and performance, daily life, biological rhythm, etc. at a low cost with a simple configuration.

Further, in the invention according to claim 2 , in addition to the effect of the invention according to claim 1 , the light emission color of the light guide plate can be changed to a color suitable for the user by operating the operation unit.

Further, in the invention according to claim 3 , in addition to the effect of the invention according to claim 1 , the light emission color of the light guide plate can be changed to a color according to the time by the control means.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. The surface light-emitting device of this example is installed on the wall of a building for the purpose of display, production, and lighting indoors or outdoors, and is installed on the wall of a room that forms a relaxing space such as a bedroom. When the surface light emitting device is installed on the wall, the surface light emitting device may be embedded in the wall or attached to the wall surface.

  As shown in FIG. 2, the surface light emitting device includes a light reflecting portion 2 formed of a reflecting plate, a light guide plate 1 provided along one side (one surface facing the thickness direction) of the light reflecting portion 2, and a light guide plate 1 as a light source. Are provided with a plurality of point light sources 5 arranged in parallel in the longitudinal direction of the end surface (one surface facing the direction orthogonal to the thickness direction).

  The light guide plate 1 is formed in a rectangular shape, and has one surface attached to one surface constituting the reflection surface of the light reflection portion 2, and one end surface of the light guide plate 1 serves as the incident surface 1 a, opposite to the light reflection portion 2. The one side is an emission surface 1b.

  Further, when the upper end surface of the light guide plate 1 is the entrance surface 1a as described above, the light source side of the light guide plate 1 is bright and easily emits light. The property, shape, or the like is changed so that the derivation rate of light from the exit surface 1b of the light guide plate 1 increases toward the end surface on the opposite side, or a light guide print pattern is applied to the exit surface 1b of the light guide plate 1 or the like. Thus, the light can be uniformly emitted from the emission surface 1b of the light guide plate 1.

Further, the light exiting surface 1b of the light guide plate 1 is provided with a light transmitting part 9 made of a light transmitting plate having a pattern such as a wood grain pattern. Light from the light emitting surface 1b of the light guiding plate 1 is transmitted through the light transmitting part 9 . It is made to radiate | emit through. In addition, you may make it irradiate the illumination space directly with the light radiate | emitted from the output surface 1b of the light-guide plate 1, without providing the light transmissive part 9. FIG.

  As shown in FIG. 1, each point light source 5 is mounted in a line on a substrate 6 facing the incident surface 1 a of the light guide plate 1 so as to face the incident surface 1 a of the light guide plate 1. As these point light sources 5, two or more types of point light sources 5 having different emission colors are provided.

  In the illustrated example, the point light source 5 emits light of two different color tones, which includes a white point light source 5a made of a light emitting diode emitting white light and an orange point light source 5b made of a light emitting diode emitting orange light. Light sources 5a and 5b are provided.

  Both point light sources 5a and 5b are alternately arranged in the longitudinal direction of the incident surface 1a of the light guide plate 1, and are provided in a range corresponding to the entire length of the incident surface 1a in the longitudinal direction. As shown in FIG. 3, the pitch a of the white point light source 5a and the pitch b of the orange point light source 5b are set to values that can reduce brightness unevenness between the point light sources 5 and achieve a reasonable cost. Here, the pitch a and the pitch b may be the same value or different values.

  By arranging the point light sources 5a and 5b side by side as described above, a point light source including one white point light source 5a and one orange point light source 5b is provided at a position facing the incident surface 1a of the light guide plate 1. A plurality of sets 7 are provided in the longitudinal direction of the incident surface 1 a of the light guide plate 1. In FIG. 2, the white point light source 5a and the orange point light source 5b in each light source set 7 are provided in the longitudinal direction of the incident surface 1a with a constant interval c. However, as shown in FIG. The white point light source 5a and the orange point light source 5b in each light source set 7 may be provided adjacent to each other so that the light emission and the light emission from the orange point light source 5b are sufficiently mixed.

  Here, the surface light emitting device includes a light source selection unit that selectively emits any type of point light source 5 among all the point light sources 5a and 5b. The light emitting light source selecting means of this example comprises control means for automatically selecting the point light source 5 to emit light according to the time, and the control means is as shown in Table 1 below according to the time determined by a timer function (not shown). The light emission and light emission stop of the white point light source 5a and the orange point light source 5b of each light source set 7 are automatically switched.

  That is, the control means divides the day into three time zones: morning and noon time zones, evening and night time zones, and midnight time zones. The light source 5a emits light and all the orange point light sources 5b stop emitting light. In the evening and night time zones, all white point light sources 5a and orange point light sources 5b emit light, and in the midnight time zone. Is set so that all white point light sources 5a stop emitting light and all orange point light sources 5b emit light. As a result, in the morning and noon time zones, only the white point light source 5a emits light to cause the light guide plate 1 to emit white light having a color temperature of about 4000k, and in the evening and night time zones, the white point The light source 5a and the orange point light source 5b emit light to mix the light emitted from the two point light sources 5a and 5b, so that the light guide plate 1 has a light bulb color having a color temperature of about 3000k (that is, an intermediate color in which white and orange are mixed). In the late-night time zone, only the orange point light source 5b emits light, and the light guide plate 1 emits orange light having a color temperature of about 2000k. That is, the color temperature of sunlight in one day changes as shown in FIG. 5, but the light emission color of the light guide plate 1 is changed from white to light bulb color to orange in accordance with the image of the change in the color temperature of sunlight. And change in order.

  The surface light emitting device is installed on a wall or the like with the exit surface 1a of the light guide plate 1 facing the room to be illuminated. In order to perform illumination with this surface light emitting device, the control means as described above The point light source 5 selected according to each time zone is caused to emit light. Thereby, the light from each point light source 5 is introduced into the light guide plate 1 through the incident surface 1 a of the light guide plate 1, and then the inside of the light guide plate 1 while being reflected by both surfaces of the light guide plate 1 and the light reflecting portion 2. The light travels toward the end surface on the side opposite to the incident surface 1a, and at this time, light leaks little by little from the light exit surface 1b of the light guide plate 1, whereby substantially the entire light guide plate 1 emits light in a planar shape.

  Here, in the surface light emitting device of this example, two types of point light sources 5a and 5b having different emission colors are provided as light sources, and a plurality of these point light sources 5a and 5b are arranged in parallel in the longitudinal direction of the end surface of the light guide plate 1. In addition, since the light source selection means (control means) for selectively emitting any point light source 5 among the plurality of point light sources 5a and 5b is provided, the point light source 5 to be emitted is selected by the light source selection means. The light emission color of the light guide plate 1 can be changed to an arbitrary color. Specifically, by automatically changing the point light source 5 that emits light according to the time by the control means, only the white point light source 5a is emitted in the morning and noon, and the light guide plate 1 has a feeling of brightness and the morning. The light bulb emits white light having a daytime image, and emits both the white point light source 5a and the orange point light source 5b in the evening and night, and the light guide plate 1 has a warm and high-quality image of night and evening. In the night, only the orange point light source 5b can emit light, and the light guide plate 1 can be emitted in orange, which is difficult to wake up. Therefore, the light emission color of the light guide plate 1 can be changed in substantially the same manner as the change in the color temperature of sunlight. For example, the living body rhythm of the resident can be adjusted by installing it in a room without a window. Moreover, this can be realized only by arranging a plurality of point light sources 5a and 5b as light sources, and the surface light-emitting device can have a simple configuration and cost can be reduced.

  Although the control means in the above embodiment changes the point light source 5 that emits light according to the time determined by the timer function, the point light source 5 that emits light may change depending on the date and time determined by the calendar function. In addition, the point light source 5 that emits light according to only the date as well as the control according to the time may be changed.

  In the above embodiment, the light source selection unit is provided with a control unit that automatically selects the point light source 5 to emit light. However, the operation unit 8 for manually selecting the point light source 5 to emit light as the light source selection unit is provided. It may be provided.

FIG. 6A shows an example in which the operation unit 8 is configured by one operation switch 8a. Each time the operation switch 8a is operated, the light emission color of the light guide plate 1 is white → bulb color → orange → white (hereinafter the same). Cycle) and the point light source 5 that emits light so as to change in order. FIG. 6B shows an example in which the operation unit 8 is composed of a plurality (three in the illustrated example) of operation switches 8a ₁ to 3. When the operation switch 8a ₁ is operated, the light emission color of the light guide plate 1 is shown. Is white, when the operation switch 8a ₂ is operated, the light emission color of the light guide plate 1 is a light bulb color, and when the operation switch 8a ₃ is operated, the light source 5 emits light so that the light emission color of the light guide plate 1 is orange. Is to change. Note that the light emission color of the light guide plate 1 by the operation unit 8 is the same as that when the light is changed by the control means. That is, when the light guide plate 1 emits white light, all the white point light sources 5a emit light and all light is emitted. When the light emission of the orange point light source 5b is stopped and the light guide plate 1 emits light bulb color, all the white point light sources 5a and the orange point light source 5b emit light, and when the light guide plate 1 emits light orange, all the white color is emitted. The point light source 5a stops emitting light and all the orange point light sources 5b emit light.

  As described above, by providing the operation unit 8 for manually selecting the point light source 5 to emit light as the light emission source selection means, the operation unit 8 is operated, and the user's preference, production, daily life, biological rhythm The light emission color of the light guide plate 1 can be changed according to the above.

  The surface light emitting device of each of the above embodiments is provided with two types of point light sources 5 as a light source, a white point light source 5a that emits white light and an orange point light source 5b that emits orange light. However, it may be provided with three or more types of point light sources. Further, in each of the above embodiments, it is set so that all of the arbitrary types of point light sources 5 selected by the light emission source selection means emit light. However, among the selected arbitrary types of point light sources 5, the point light source 5 that emits light is selected. The selection of the point light source 5 that emits light, such as selection, can be appropriately changed in design.

An example of embodiment of this invention is shown and a figure is explanatory drawing of the principal part of a surface emitting device. It is explanatory drawing of a surface light-emitting device same as the above. It is explanatory drawing which shows the arrangement | sequence of the point light source of a surface light-emitting device same as the above. It is explanatory drawing which shows the arrangement | sequence of the point light source of another example. It is a graph which shows the change of the color temperature of sunlight in one day. (A) shows an example of the operation unit, and (b) shows another example of the operation unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light guide plate 5a White point light source 5b Orange point light source 8 Operation part

Claims (3)

In an edge light type illumination device that derives light introduced from an end face of a light guide plate from one side, the light source includes a white point light source with a white emission color and an orange point light source with an orange emission color, and these point light sources are connected to the light guide plate. juxtaposed in the longitudinal direction of the end face, and a state where the emission color of the light guide plate to emit only white point light source to be white, and a state where the emission color of the light guide plate to emit only orange point light source such that the orange The light source plate is provided with a light source selection means for switching the light emitted from the white point light source and the orange point light source to a state in which light emitted from both point light sources is mixed so that the light emission color of the light guide plate is an intermediate color between white and orange. A surface light-emitting device. As the light emission source selection means, for manually changing a state of emitting only the white point light source, a state of emitting only the orange point light source, and a state of emitting the white point light source and the orange point light source The surface light-emitting device according to claim 1, further comprising an operation unit. As the light emission source selection means, a state of emitting only the white point light source, a state of emitting only the orange point light source, and a state of emitting the white point light source and the orange point light source are automatically set according to time. 2. The surface light emitting device according to claim 1, further comprising control means for changing.

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