JP2004296345A - Surface light emitting device - Google Patents

Surface light emitting device Download PDF

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Publication number
JP2004296345A
JP2004296345A JP2003089181A JP2003089181A JP2004296345A JP 2004296345 A JP2004296345 A JP 2004296345A JP 2003089181 A JP2003089181 A JP 2003089181A JP 2003089181 A JP2003089181 A JP 2003089181A JP 2004296345 A JP2004296345 A JP 2004296345A
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JP
Japan
Prior art keywords
light
surface
guide plate
emitting device
light guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2003089181A
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Japanese (ja)
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JP4238977B2 (en
Inventor
Toshihiro Hata
Hidetoshi Tsuji
俊博 秦
秀敏 辻
Original Assignee
Toto Ltd
東陶機器株式会社
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Application filed by Toto Ltd, 東陶機器株式会社 filed Critical Toto Ltd
Priority to JP2003089181A priority Critical patent/JP4238977B2/en
Publication of JP2004296345A publication Critical patent/JP2004296345A/en
Application granted granted Critical
Publication of JP4238977B2 publication Critical patent/JP4238977B2/en
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Abstract

An object of the present invention is to provide a surface light emitting device that is excellent in appearance design as a decorative face material when not lit, and can be used as a decorative face material having a surface light emitting function when lit.
A linear light source 11 is disposed on at least one end surface of a transparent light guide plate 10 and a gradation is provided on the back side of the light guide plate 10 such that the area ratio at a location away from the light source is larger than the area ratio near the light source. In the surface light emitting device having the light reflecting layer 13 having the pattern, the second light reflecting layer 12 is provided between the back surface of the light guide plate and the light reflecting layer having the gradation pattern.
[Selection] Figure 1

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an edge light type surface emitting device.
[0002]
[Prior art]
Conventionally, as an edge light type illumination device, as shown in FIG. 6, a lamp such as a cold cathode tube or a hot cathode tube is used as a light source 61, which is arranged on both sides of a light guide 62 made of a translucent material. In addition, a diffusion sheet 63 made of a milky white synthetic resin material having a light scattering effect is provided on the upper surface of the light guide 62 in order to make the luminance of the light emitting surface uniform, and the reflection sheet 64 is a specular reflection plate or light. A scattering acrylic plate or the like is used. The reflection sheet 64 is provided in order to improve the light utilization efficiency by reflecting the light emitted from the light source toward the back and guiding it to the front.
In the figure, 67 is a reflecting plate for reflecting light from the light source to the light guide 62 side, and X is a liquid crystal display plate. Further, in order to scatter the reflected light on the reflection sheet 64, a white ink 68 (light scattering layer) is formed by printing between the lower surface of the light guide 62 and the reflection sheet 64 (see, for example, Patent Document 1). (Conventional example 1).
[0003]
Another conventional example is shown in FIG.
This is an illumination for forming at least one of the top plate 1, the base plate 2, the left and right side plates 3, 4, and the back plate 5 with the light guide plate 7 and supplying the light to the light guide plate 7 to cause the light guide plate 7 to emit light. A lighting fixture storage portion 17 for storing the fixture 8 is provided in the cabinet 6, the lighting fixture storage portion 17 has an openable / closable lid 18, and a color filter (not shown) for coloring the light from the lighting fixture 8 is provided. The lighting fixture storage unit 17 is detachably disposed.
Thereby, the light emission color of the light guide plate 7 that is supplied with light from the lighting fixture 8 and emits light can be freely selected by opening the lid 18 and replacing the color filter. The light guide plate 7 is transparent and has a reflection layer (not shown) on the back. In addition, 15 is equipped with various components required for illumination, such as a ballast, 16 is a switch of the lighting fixture 8 (for example, refer patent document 2) (conventional example 2).
[0004]
[Patent Document 1]
JP-A-4-329521 (page 122, Fig. 3)
[Patent Document 2]
Japanese Patent Laid-Open No. 5-137624 (page 3, FIG. 2)
[0005]
[Problems to be solved by the invention]
However, in the conventional example 1, it may be a liquid crystal display device, and when it is not lit, the liquid crystal display plate looks black. However, even if this liquid crystal display plate is removed and used as a surface light emitting means for a decorative plate, a decorative shelf, or a cabinet, When not lit, the diffusion sheet 63 made of a milky white synthetic resin material located under the liquid crystal display panel can be seen. Examples of other diffusing sheets include films and plates coated with a light diffusing material, and both are generally milky white or white. As another means for scattering light in order to make the luminance of the light exit surface uniform, there is a method of making the surface satin, but it becomes cloudy and white when not lit. Needless to say, if the diffusion sheet, which is the purpose of uniforming the luminance of the light emitting surface, is eliminated, the sheet becomes non-uniform, and the pattern printing looks and looks bad.
Further, the diffusion sheet, the reflection sheet, and the light guide plate are generally fixed with a metal frame or the like.
[0006]
Next, in the conventional example 2, when the light is not turned on, the reflection layer on the back of the light guide plate 7 can be seen. Examples of the reflective layer include a film or plate in which a white pigment is mixed in a resin, an aluminum plate with white coating or printing, a metal plate with a mirror surface, a metal foil such as aluminum, or a metal vapor deposition such as aluminum or silver. There are applied films and plates, and it looks white or silvery.
For example, when a conventional surface light emitting device is used for a decorative plate (front plate) of a system kitchen, a vanity shelf in a bathroom, or a cabinet, there is a sufficient case where light is not emitted in a daylighted place. The appearance of the state is not preferable as the appearance because the texture and color tone are not taken into account, and moreover, it cannot be finished in various textures and colors according to the user's preference.
Also, if the diffusion sheet, reflection sheet and light guide plate are fixed with a metal frame, etc., if there is a problem with the appearance of the frame, it is necessary to cover the frame with a decorative plate, and the entire decorative plate cannot be shined. There was a problem that constraints were generated and the structure was complicated.
[0007]
The present invention has been made to solve the above problems, and the object of the present invention is to be used as a decorative face material having excellent appearance design as a decorative face material when not lit and having a surface emitting function when lit. An object of the present invention is to provide a surface light emitting device that can be used.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a light source is disposed on at least one end surface of a transparent light guide plate, and the back side of the light guide plate is located farther from the light source than the area ratio in the vicinity of the light source. In a surface light-emitting device having a light reflection layer with a gradation pattern that increases the area ratio, a second light reflection layer is provided between the back surface of the light guide plate and the light reflection layer with a gradation pattern.
[0009]
Thereby, in the non-lighting state, the second light reflecting layer located on the surface side is reflected by external light from the surface side of the light guide plate and looks like the color tone of the second light reflecting layer. By finishing the layer with a suitable texture and color tone as a decorative face material in advance, it is possible to obtain the appearance quality with the desired texture and color tone when not lit. Further, when the light is turned on, the light reflected by the second light reflecting layer emits light on the surface side. However, if surface light is emitted only by the second reflecting layer, the vicinity of the light source is bright and becomes dark at a place away from the light source. Becomes non-uniform. Therefore, in the present invention, the light leaked from the second light reflecting layer to the back side is reflected by the light reflecting layer of the gradation pattern on the back side in a small amount of reflected light in the vicinity of the light source, and a large amount of reflected light is separated from the light source. The surface was made to shine uniformly by emitting light to the surface side. As a result, it is possible to provide an unprecedented surface light-emitting device as a decorative surface material that is excellent in appearance design as a decorative face material when not lit and has a surface light emitting function when lit.
[0010]
According to a preferred aspect of the present invention, in the surface light emitting device according to the first aspect, the color tone of the light reflecting layer of the gradation pattern is substantially the same as the color tone of the second light reflecting layer. The color tone was closer to white than the second light reflecting layer.
[0011]
Since the color tone of the light reflecting layer of the gradation pattern is substantially the same as the color tone of the second light reflecting layer, the gradation pattern is not visible when not lit, and the second light reflecting layer is exposed by external light from the surface side of the light guide plate. The light reflection layer looks like the color tone of the second light reflection layer. By finishing this light reflection layer with a suitable texture and color tone as a decorative face material, the appearance with the desired texture and color tone when not lit Quality can be reliably obtained. Also, since the gradation pattern is difficult to see even if the color tone of the light reflecting layer of the gradation pattern is closer to white than the color tone of the second light reflecting layer, the second light reflecting layer due to external light from the surface side of the light guide plate The same effect can be obtained by the reflection.
[0012]
According to a third aspect of the present invention, in the surface light emitting device according to any one of the first to second aspects, a white light reflecting layer having a high light shielding property is provided on the back side of the light reflecting layer of the gradation pattern. .
[0013]
As a result, even when the environment behind the white light-reflecting layer with high light shielding properties is bright when not lit, the desired appearance texture and color tone can be achieved by external light from the surface side without being affected by this brightness. You can definitely get it. In addition, since the white light reflecting layer is used, light leaking from the reflecting layer located on the front side is reflected on the front side with a high reflectance, so that a brighter surface light emitting device can be provided.
[0014]
In the invention of claim 4 of the present invention, a light source is disposed on at least one end surface of the light guide plate, and a gradation pattern is provided on the back side of the light guide plate such that the area ratio at a location away from the light source is larger than the area ratio near the light source. In the surface light emitting device having the light reflection layer, the light guide plate was colored translucent, and the light reflection layer of the gradation pattern was colored in substantially the same color tone as the light guide plate.
[0015]
Thereby, even when the light guide plate is viewed from the surface side when not lit, it is difficult to see the gradation pattern and a good appearance quality can be obtained. When the light is lit, a uniform light emitting surface can be provided by the gradation pattern.
[0016]
As a preferred aspect of the present invention, in the invention according to claim 5 of the present invention, in the surface light emitting device according to any one of claims 1 to 4, the light guide plate and the light reflecting layer are integrated.
[0017]
As a result, it is not necessary to fix each reflective layer with a metal frame, etc., so that the entire decorative board can be illuminated, not only the degree of freedom of design is increased, but also a simple structure is required, and it is superior in manufacturing and handling. Needless to say.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0019]
【Example】
FIG. 1 is a schematic sectional view showing an embodiment of a surface light emitting device according to the present invention, and FIG. 4 is a schematic plan view showing an embodiment of the surface light emitting device according to the present invention. In the figure, 10 is a light guide plate, 11 is a linear light source, 12 is a light reflection layer, and 13 is a light reflection layer having a gradation pattern in which the area ratio at a location far from the light source is larger than the area ratio near the light source. .
[0020]
The light guide plate 10 preferably has a rectangular shape with a thickness of about 1 mm to 5 mm, and the material is not particularly limited as long as it is a substance that allows light to pass efficiently. For example, acrylic, polycarbonate, polystyrene, acrylic styrene, polyvinyl chloride Resins such as glass or glass can be used. Moreover, it is preferable that all the side surfaces of the light guide plate 10 are finished smoothly. The light guide plate 10 may be curved.
[0021]
As the linear light source 11, a hot cathode ray tube or a cold cathode ray tube having a diameter of about 1.5 mm to 4 mm is used. The linear light source 11 may be disposed only on one side as shown in FIG. 1 or may be disposed on the other side. Further, the linear light source 11 may be straight, L-shaped over two adjacent side surfaces, or U-shaped over three adjacent side surfaces.
[0022]
The light reflection layer 12 is formed almost uniformly on the entire back surface of the light guide plate 10. On the back surface of the light reflection layer 12, a light reflection layer 13 having a gradation pattern is formed so that the area ratio at a location away from the light source is larger than the area ratio near the light source. As a method for forming the light reflecting layer 12 and the light reflecting layer 13 having a gradation pattern, there are printing methods such as gravure printing using mat ink, offset printing, screen printing, and transfer methods.
[0023]
The light reflecting layer 12 is colored ivory (ivory color) and has a film thickness of about 15 μm. The light reflecting layer 12 scatters and reflects the light guided from the linear light source 11 into the light guide plate 10 and directs a part thereof toward the surface side of the light guide plate 10. The light reflection layer 13 having a gradation pattern reflects light that has not returned to the light guide plate 10 in the light reflection layer 12 to the light guide plate 10 side so that the light can be used efficiently. The light reflection layer 13 having a gradation pattern has substantially the same color tone as the light reflection layer 12 or a color tone closer to white than the light reflection layer 12, and the film thickness is the same as that of the light reflection layer 12.
[0024]
The area ratio of the light reflecting layer 13 is changed by configuring the light reflecting layer 13 with arbitrary dots and changing the size of the dots or changing the number of dots depending on the position. The shape of the dot is not particularly limited, and may be an arbitrary shape such as a round dot, a square dot, or a chain dot. Moreover, you may form in stripe form instead of a dot.
[0025]
Next, details will be described regarding how the light guide plate 10 is seen from the surface side in the non-lighting state and the lighting state. In the non-lighting state, the light reflecting layer 12 formed on the entire back surface of the light guide plate 10 is reflected by external light from the front side of the light guide plate 10, and the ivory (ivory color) that is the color tone of the light reflecting layer 12 is reflected. The light reflection layer 13 of the gradation pattern that is visible and located on the back surface thereof has substantially the same color tone as the light reflection layer 12 or a color tone closer to white than the light reflection layer 12, and the film thickness is the same as that of the light reflection layer 12. The gradation pattern of the light reflecting layer 13 of the gradation pattern and the color tone are not affected. Therefore, by finishing the light reflecting layer 12 with a suitable texture and color tone as a decorative face material in advance, it is possible to obtain an appearance quality having the desired texture and color tone when not turned on.
[0026]
In the lighting state, the light guided from the linear light source 11 into the light guide plate 10 is scattered and reflected by the light reflecting layer 12, and a part of the light is emitted toward the surface side of the light guide plate 10 but temporarily reflected. When only the layer 12 emits light, the reflection layer 12 is uniformly formed on the entire back surface of the light guide plate. Therefore, the light guided into the light guide plate 10 attenuates as the distance from the linear light source 11 increases, and the linear light source 11 Scattered reflected light decreases as the position is further away from the surface, and the surface side of the light guide plate 10 tends to be darker and uneven. Therefore, in the present invention, light leaked from the light reflecting layer 12 to the back side (light transmitted through the light reflecting layer 12 toward the back side) is reflected in a small amount in the vicinity of the light source by the light reflecting layer of the gradation pattern on the back side. In a place away from the light source, a large amount of reflected light is emitted to the surface side so that the surface is uniformly illuminated. From the above, by providing the second light reflecting layer 12 between the back surface of the transparent light guide plate 10 and the light reflecting layer 13 of the gradation pattern, it is excellent in appearance design as a decorative face material when not lit. An unprecedented surface light emitting device can be provided as a decorative face material having a surface light emitting function when lit.
[0027]
FIG. 2 is a schematic cross-sectional view showing an embodiment of the surface light emitting device according to the present invention. In the figure, 10 is a light guide plate, 11 is a linear light source, 12 is a light reflecting layer, 13 is a light reflecting layer having a gradation pattern in which the area ratio at a location far from the light source is larger than the area ratio in the vicinity of the light source, 14 Indicates a white light reflecting layer having a high light shielding property.
[0028]
The light guide plate 10, the linear light source 11, the light reflection layer 12, and the light reflection layer 13 having a gradation pattern in which the area ratio at a location away from the light source is larger than the area ratio in the vicinity of the light source are formed in the same manner as in FIG. ing.
Similar to the light reflecting layer 12 and the gradation pattern light reflecting layer, the white light reflecting layer 14 having a high light shielding property is formed by a printing method or a transfer method, and has a film thickness of about 25 μm.
[0029]
In the non-lighting state, even when the environment behind the white light-reflecting layer 14 having a high light-shielding property is bright, the intended appearance is achieved by external light from the surface side of the light guide plate 10 without being affected by the brightness. The texture and color tone can be obtained with certainty. Further, since the light reflection layer 14 is white, light leaked from the reflection layer located on the front side to the back side is reflected to the front side with a high reflectance, so that a brighter surface light emitting device can be provided. The light reflecting layer 14 is not limited to white depending on the color tone of the light reflecting layer 13 having a gradation pattern in which the area ratio of the portion away from the light source is larger than the area ratio in the vicinity of the light reflecting layer 12 and the light source. Aluminum or silver having a high light shielding property and a high reflectance may be deposited.
[0030]
FIG. 3 is a schematic cross-sectional view showing an embodiment of a surface light emitting device according to the present invention. In the figure, 30 is a light guide plate colored semi-transparent and pale blue, 11 is a linear light source, 33 is a light reflection of a gradation pattern in which the area ratio at a location far from the light source is larger than the area ratio near the light source. The layer is colored pale blue.
[0031]
Since the light guide plate 30 and the reflection layer 30 of the gradation pattern are colored in the same light blue as described above, it is difficult to see the gradation pattern when not lit, and the entire surface looks light blue. Excellent. In addition, since the light reflected to the light guide plate 30 is uniformly scattered and reflected by the gradation reflection layer 33 at the time of lighting, it can be used as a decorative face material having a uniform surface emitting function.
[0032]
In the above embodiments, each reflective layer is integrally formed with the light guide plate by a printing method or a transfer method, so it is not necessary to fix each reflective layer with a metal frame or the like, and the entire decorative plate can be illuminated. Needless to say, not only the degree of freedom of design is increased, but also a simple structure is sufficient, and it is superior in manufacturing and handling. In addition, a light source reflecting plate (not shown) that covers the linear light source 11 is arranged so as to reflect light from the linear light source 11 radiated in the direction opposite to the light guide plate in the direction of the light guide plate, thereby efficiently transmitting light. May be used.
[0033]
FIG. 5 is a schematic cross-sectional view showing an embodiment in which the surface light emitting device according to the present invention is used for a dressing shelf. In the figure, 10 is a light guide plate, 11 is a linear light source, 12 is a light reflection layer, and 13 is a light reflection layer having a gradation pattern in which the area ratio at a location far from the light source is larger than the area ratio near the light source. This is formed in the same manner as in FIG. Reference numeral 54 denotes a metal fitting for holding the shelf. The surface is finished with a white coating having a high light-shielding property, the film thickness is about 25 μm, and the light reflecting layer 12 integrated with the light guide plate 10, the light reflecting layer 13 with a gradation pattern, Bonded with double-sided tape. Further, it is fixed to the wall 58 with a mounting screw 57. Reference numeral 55 denotes a light source reflector that covers the linear light source 11 so as to reflect light from the linear light source 11 radiated in the direction opposite to the light guide plate in the direction of the light guide plate, and is made of aluminum having high reflectivity. Reference numeral 56 denotes a linear light source ballast.
[0034]
By using such a surface light-emitting device for a dressing shelf, when it is not lit, external light from the front side of the light guide plate 10 appears to be an ivory (ivory color) that is the color tone of the reflecting surface 12, and a good texture and color tone are obtained. be able to. In addition, when the light is turned on, the front side of the light guide plate 10 emits light evenly, and an eye-catching effect and a light decoration effect for a shelf figurine, and a decorative shelf that is unconventional as a light accent to the installation space. In addition, since the light guide plate 10 and each reflective layer are integrated, there is no need for a fixing frame on at least the side of the front of the shelf, that is, the side of the shelf on the near side when viewed from the user side, and there is no fixed frame and it is natural and refreshing. In addition, a thin cosmetic shelf with a surface emitting function can be provided.
[0035]
Roughly, the emission color of the linear light source 11 is not limited to white, but by making it blue or green, it is possible to experience different color tones when it is not lit and when it is lit. It goes without saying that it becomes a commercial product.
[0036]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a surface light emitting device that is excellent in appearance design as a decorative face material when not lit, and can be used as a decorative face material having a surface light emitting function when lit.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a surface light emitting device according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view showing a surface light emitting device according to an embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view showing a surface light emitting device according to an embodiment of the present invention.
FIG. 4 is a schematic plan view showing a surface light emitting device according to an embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view showing a surface light emitting device according to an embodiment of the present invention.
FIG. 6 is a schematic cross-sectional view showing a conventional surface light emitting device.
FIG. 7 is a perspective view of a conventional cabinet having a light decoration function.
[Explanation of symbols]
7 ... Light guide plate 8 ... Lighting fixture 10 ... Light guide plate 11 ... Linear light source 12 ... Light reflection layer 13, 33 ... Light reflection layer 14 with gradation pattern ... White light reflection layer 30 with high light shielding property ... Semi-transparent light blue Colored light guide plate 54 ... shelf holder 55 ... light source reflector 56 ... stabilizer 57 ... mounting screw 58 ... wall 61 ... light source 62 ... light guide 63 ... diffusion sheet 64 ... reflection sheet 67 ... reflector 68 ... white Ink

Claims (5)

  1. In a surface light emitting device in which a light source is disposed on at least one end surface of a transparent light guide plate, and a light reflection layer of a gradation pattern is provided on the back side of the light guide plate so that the area ratio at a location away from the light source is larger than the area ratio in the vicinity of the light source A surface light emitting device comprising a second light reflecting layer provided between the back surface of the light guide plate and the light reflecting layer having a gradation pattern.
  2. 2. The surface light emitting device according to claim 1, wherein a color tone of the light reflection layer of the gradation pattern is substantially the same as a color tone of the second light reflection layer, or is closer to white than the second light reflection layer. Surface emitting device.
  3. 3. The surface light emitting device according to claim 1, wherein a white light reflecting layer having a high light shielding property is provided on the back side of the light reflecting layer of the gradation pattern.
  4. In a surface light emitting device in which a light source is disposed on at least one end surface of a light guide plate, and a light reflection layer having a gradation pattern is provided on the back side of the light guide plate so that the area ratio at a location away from the light source is larger than the area ratio in the vicinity of the light source. The surface light-emitting device is characterized in that the light guide plate is colored translucently and the light reflection layer of the gradation pattern is colored in substantially the same color tone as the light guide plate.
  5. 5. The surface light emitting device according to claim 1, wherein the light guide plate and the light reflecting layer are integrated.
JP2003089181A 2003-03-27 2003-03-27 Surface emitting device Active JP4238977B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006052059A1 (en) * 2004-11-15 2006-05-18 I.S High Tech, Inc. A method for automatic designing patterns of light guide plate and systems thereof
JP2007317424A (en) * 2006-05-24 2007-12-06 Pioneer Electronic Corp Backlight device and display device
WO2016056052A1 (en) * 2014-10-06 2016-04-14 堺ディスプレイプロダクト株式会社 Light guide unit, light source device, and display device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006052059A1 (en) * 2004-11-15 2006-05-18 I.S High Tech, Inc. A method for automatic designing patterns of light guide plate and systems thereof
JP2007317424A (en) * 2006-05-24 2007-12-06 Pioneer Electronic Corp Backlight device and display device
WO2016056052A1 (en) * 2014-10-06 2016-04-14 堺ディスプレイプロダクト株式会社 Light guide unit, light source device, and display device
JPWO2016056052A1 (en) * 2014-10-06 2017-07-27 堺ディスプレイプロダクト株式会社 Light guide unit, light source device, and display device
US10107953B2 (en) 2014-10-06 2018-10-23 Sakai Display Products Corporation Light guide unit, light source device and display apparatus

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