JP2017091678A - Surface light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface light emitting device capable of producing a three-dimensional space with depth, by changing light patterns.SOLUTION: A surface light emitting device 1 includes: a light guide plate 2 having light transmissivity; a light source 3 for irradiating an end surface 2c of the light guide plate 2 with light; and a light diffusion layer 4 provided on a rear surface 2b of the light guide plate 2, for diffusing the light which has entered from the light source 3 and emitting it from a surface 2a of the light guide plate 2. The plurality of pieces of light guide plates 2 are superposed, and the light diffusion layers 4, 4, ... of each of the light guide plates 2, 2, ... are formed as different patterns respectively. Therefore, by reciprocating the position of the light source 3 along the thickness direction of the light guide plate 2, and by irradiating each end surface of the light guide plates 2A-2E with the light from lighting LED chips 3a individually, the light of different pattern shapes is viewed so as to sterically float sequentially.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a surface light-emitting device in which a light guide plate emits light by light emitted from a light source.

  2. Description of the Related Art Conventionally, as this type of device, for example, a U-shaped linear light source surface emitting device described in Patent Document 1 below is known. In this apparatus, a U-shaped line light source is disposed over three side surfaces of the light guide plate, and a side reflector is disposed on one side surface of the light guide plate on which the U-shaped line light source is not disposed. A back reflector is disposed on the back surface of the light diffusing and transmitting portion of the light guide plate, and a light diffuser plate is disposed on the surface of the light guide plate.

  According to this surface light emitting device, light from the U-shaped line light source enters from the three side surfaces of the light guide plate, reaches the light diffusion / transmission portion on the back surface, and diffuses. The diffused light is reflected by the side reflector and the rear reflector and is emitted through the light diffuser on the surface, so that the surface of the light guide plate emits light.

Japanese Patent Laid-Open No. 7-36036

  In the conventional surface light emitting device described above, light is irradiated on the three side surfaces of the light guide plate, so that the amount of light incident on the light guide plate is increased to obtain surface light emission with high luminance. However, according to this apparatus, the light incident on the light guide plate reaches the light diffusing and transmitting portion and is diffused in all directions, and the entire light guide plate emits light evenly, thereby expressing light changes and stereoscopic effects. It is impossible.

  Therefore, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a surface light emitting device capable of producing a three-dimensional space having a depth by a changing light pattern. .

  In order to achieve the above object, a surface light-emitting device of the present invention is provided with a light-transmitting light guide plate, a light source that irradiates light to an end surface of the light guide plate, and a back surface of the light guide plate. A light diffusing layer that diffuses light incident from the surface and emits the light from the surface of the light guide plate, and a plurality of the light guide plates are stacked, and the light diffusion layers of each light guide plate are formed in different patterns. It is characterized by that.

  In this invention, the said light-guide plate can be comprised by either transparent glass, transparent resin, or an air layer.

  In the present invention, the light diffusing layer may be a light diffusing paint pattern printed on the light guide plate, a blasted surface of the light guide plate, or a dot pattern printed with a light diffusing ink on the light guide plate. Or a product obtained by cutting a groove in the light guide plate.

  Further, in the present invention, the light source is provided so as to be movable along the thickness direction of the plurality of light guide plates, and individually moved to each end face of the plurality of light guide plates by moving the light source to be lit. You may make it irradiate light.

  Further, in the present invention, the light source is arranged independently on each of the end surfaces of the plurality of light guide plates, and the light source to be lit is selectively switched to individually select each end surface of the plurality of light guide plates. You may make it irradiate light.

  According to the surface light emitting device of the present invention, the light from the light source is irradiated onto each end face of the plurality of light guide plates, so that light of different pattern shapes appears to appear in order, so that a three-dimensional space with depth is provided. Can be effectively produced.

It is a disassembled perspective view of the surface light-emitting device of this invention. It is sectional drawing of the surface light-emitting device of this invention. It is an expanded sectional view which shows the example of the light-diffusion layer in the surface emitting device of this invention. It is the fragmentary sectional view and top view which show the effect of the surface light-emitting device of this invention. It is sectional drawing which shows the modification of the surface emitting device of this invention. It is sectional drawing which shows the other modification of the surface emitting device of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the surface light-emitting device 1 of the present embodiment is applied to a lighting fixture that produces a three-dimensional space with a depth by changing light. .. And the light source 3 installed on the end face of the light guide plate 2. The surface light emitting device 1 is a so-called edge light type surface light emitting device in which the surface 2 a of the light guide plate 2 emits light by irradiating light onto the end face (edge) 2 c of the light guide plate 2 from the light source 3.

  The light guide plate 2 is composed of a transparent base material having translucency. Transparent glass such as soda glass, borosilicate glass, and quartz glass is common as the type of transparent substrate, but in addition to transparent resins such as acrylic resin and polycarbonate resin, facing transparent film, transparent glass, and transparent glass An air layer provided in the middle with resin or the like may be used. The plate thickness of the light guide plate 2 is not particularly limited, but if it is too thin, light from the light source 3 is difficult to enter, and if it is too thick, it is difficult to transmit light when superimposed, so about 1.0 to 30 mm is preferable. is there. In addition, when using transparent glass for the light-guide plate 2, since the irradiated light will be spread | diffused and permeate | transmitted, it will be preferable if the ground glass process which gave the fine flaw to an end surface is performed.

  A light source 3 is installed on at least one end surface (left end surface in the present embodiment) 2 c of the light guide plate 2. The light source 3 is composed of LEDs from the viewpoint of power saving and low heat generation. In this embodiment, in order to irradiate light uniformly to the end surface 2c of the light guide plate 2, an LED module for illumination in which a plurality of LED chips 3a, 3a,... Are arranged at equal intervals in a horizontal row is used. . This illumination LED module is designed to have a length corresponding to the width of the light guide plate 2, and as shown in FIG. 2, the thickness direction of the plurality of light guide plates 2, 2,... It is provided so that reciprocation is possible. The emission color of the LED chip is not particularly limited, and white, blue, green, and other LEDs can be used. As the type of the light source 3, a light bulb, a fluorescent lamp, a cold cathode tube, or the like may be used instead of the LED.

  .. Are provided on the back surfaces 2b, 2b,... Of the plurality of light guide plates 2, 2,. The light diffusion layer 4 has a function of reflecting and diffusing light incident from the light source 3 and emitting light from the surface 2 a of the light guide plate 2. In this embodiment, the light diffusing paint is printed on the light guide plates 2, 2,... In different patterns, thereby forming a pattern in which the frame gradually becomes smaller toward the light guide plates 2 A to 2 E. Has been. As the light diffusing paint, a paint containing a white pigment having a large diffuse reflectance such as titanium oxide can be used.

  The method for forming the light diffusing layer 4 is not limited to pattern printing using a light diffusing paint. For example, as shown in FIG. 3A, the back surface 2b of the light guide plate 2 is subjected to blasting such as sandblasting to form a rough surface portion 4a, or the light is applied to the back surface 2b of the light guide plate 2 as shown in FIG. A fine dot pattern 4b may be formed by inkjet printing of diffusible ink. Alternatively, as shown in FIGS. 3C and 3D, the rear surface 2b of the light guide plate 2 may be laser-cut to form the V-groove 4c and the concave groove 4d.

  The light guide plates 2, 2,... Are overlapped with each other and bonded together by an adhesive layer 5 in which an adhesive is cured. The type of adhesive used is preferably transparent so as not to affect the refractive index of the light guide plate 2. For example, an optical adhesive such as an acrylic resin-based ultraviolet curable adhesive can be used. Note that the light guide plates 2, 2,... May be simply overlapped without using an adhesive.

  The surface light emitting device 1 of the present embodiment is configured as described above, and is patterned through the light diffusion layers 4 formed on the respective light guide plates 2 when the LED chip 3a of the light source 3 is turned on. Light is emitted individually. That is, as shown in FIG. 4, the light irradiated from the LED chip 3 a is incident from the end surface 2 c of the light guide plate 2, reflected by the light diffusion layer 4 and diffused. For this reason, the light emitted from the surface 2 a of the light guide plate 2 appears to have light with a pattern shape of the light diffusion layer 4.

  Here, when the light source 3 at the position of the uppermost light guide plate 2A is moved to the position of the lower light guide plate 2B, the light of the pattern shape of the light diffusion layer 4A that has been shining so far disappears, and the next light diffusion The light of the pattern shape of the layer 4B emerges. Similarly, when the position of the light source 3 is moved from the lower light guide plate 2C → 2D → 2E, the pattern-shaped light emerges in the order of the light diffusion layers 4C → 4D → 4E. Thus, according to the surface light-emitting device 1 of this embodiment, the position of the light source 3 is reciprocated along the thickness direction of the light guide plate 2, and the light of the LED lamp 3a to be lit is each end surface of the light guide plates 2A to 2E. By individually irradiating the light, different patterns of light appear to emerge in order, so that a three-dimensional space with depth can be effectively produced.

  In the embodiment described above, the light source 3 is disposed on the end surface 2c of the light guide plate 2 and is provided so as to be able to reciprocate along the thickness direction. However, the number and installation positions of the light sources 3 are not limited thereto. Absent. For example, as shown in FIG. 5, the light source 3 is arranged independently on each of the end faces of the plurality of light guide plates 2 </ b> A to 2 </ b> E, and the light source 3 to be lit is selectively switched by a switch (not shown). The light guide plates 2A to 2E may be individually irradiated with light. Even with such a structure, the same effects as those of the above-described embodiment can be obtained.

  When the size of the light guide plate 2 is large, for example, exceeding 100 inches, when the light source 3 is installed only on one end surface of the light guide plate 2, light emitted from the LED chip 3a is emitted from the light guide plate 2. It fades out in the middle of the night and does not reach the entire surface. Therefore, as shown in FIG. 6, if the light sources 3 are installed on the left and right end faces of the light guide plate 2 and light is irradiated from the LED chips 3a on both the left and right sides, the light incident on the light guide plate 2 is uniformly distributed over the entire surface. Also, it is possible to sufficiently cope with the case where the size of the light guide plate 2 is desired to be enlarged.

  Furthermore, by using the effect of the surface light emitting device 1, various uses other than the lighting fixture are conceivable. For example, it is possible to configure a composite switch in which the touch switch and the surface light emitting device 1 are combined. As an example of the touch switch, when the intensity of light and the volume of sound are adjusted by combining with a dimmer or volume controller, the light emitted from the surface light emitting device 1 gradually spreads or narrows according to the intensity. If the pattern shape is loose, it is possible to visually convey the operation content to the user. Moreover, if this surface light-emitting device 1 is applied to a sign advertisement or signboard illumination, the viewer's attention increases due to the changing movement of light, so that more effective advertisement / advertisement effect can be exhibited.

1: Surface light emitting device 2: Light guide plate 2a: Front surface of light guide plate 2b: Back surface of light guide plate 2c: End surface of light guide plate 3: Light source 3a: LED chip 4: Light diffusion layer 4a: Rough surface portion 4b: Dot pattern 4c: V Groove 4d: concave groove 5: adhesive layer

Claims (5)

A light guide plate having translucency;
A light source for irradiating light to an end face of the light guide plate;
A light diffusion layer provided on the back surface of the light guide plate and diffusing the light incident from the light source to be emitted from the surface of the light guide plate;
A plurality of the light guide plates are overlaid, and the light diffusion layers of each light guide plate are formed in different patterns, respectively.   The surface light-emitting device of Claim 1 with which the said light-guide plate is comprised by either transparent glass, transparent resin, or an air layer.   The light diffusing layer is a light diffusing paint pattern printed on the light guide plate, a blasted surface of the light guide plate, a dot pattern printed with a light diffusing ink on the light guide plate, or the light guide plate. The surface light-emitting device according to claim 1, wherein the surface light-emitting device is constituted by any one obtained by cutting a groove in an optical plate.   The light source is provided so as to be movable along the thickness direction of the plurality of light guide plates, and light is individually applied to each end surface of the plurality of light guide plates by moving the light source to be lit. Item 4. The surface emitting device according to any one of Items 1 to 3. The light sources are arranged independently on each of the end surfaces of the plurality of light guide plates, and light is individually applied to each end surface of the plurality of light guide plates by selectively switching the light sources to be lit. The surface light-emitting device of any one of Claims 1-3.