WO2016170711A1 - Light guide plate assembly, light guide plate device, and light guide plate device with frame - Google Patents

Light guide plate assembly, light guide plate device, and light guide plate device with frame Download PDF

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Publication number
WO2016170711A1
WO2016170711A1 PCT/JP2015/085630 JP2015085630W WO2016170711A1 WO 2016170711 A1 WO2016170711 A1 WO 2016170711A1 JP 2015085630 W JP2015085630 W JP 2015085630W WO 2016170711 A1 WO2016170711 A1 WO 2016170711A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
light
cover
plate assembly
Prior art date
Application number
PCT/JP2015/085630
Other languages
French (fr)
Japanese (ja)
Inventor
勝保 湯浅
Original Assignee
株式会社共栄コーポレーション
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Publication date
Application filed by 株式会社共栄コーポレーション filed Critical 株式会社共栄コーポレーション
Priority to JP2017513949A priority Critical patent/JPWO2016170711A1/en
Publication of WO2016170711A1 publication Critical patent/WO2016170711A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages

Definitions

  • the present invention is directed to a light guide plate assembly for efficiently guiding light from a light source into a light guide plate, a light guide plate device including the light guide plate assembly, and a framed light guide in which the light guide plate device and a frame are integrated.
  • the present invention relates to a light plate device.
  • the light guide plate is often made of an acrylic resin in order to enhance the transparency.
  • LEDs have a width of 3 to 5 mm as a standard. Therefore, the light guide plate generally has a thickness of 3 mm or more in order to allow the light of the LED to be incident from the end face. With an acrylic light guide plate, it is difficult to bend it to a curved surface if the thickness is 3 mm or more.
  • the light guide plate when the light guide plate is made thinner, there are many merits such as saving of materials, weight saving, and further, a curved light guide plate can be created by bending the light guide plate.
  • Patent Document 1 proposes an invention in which light is reflected forward by a prism of a reflector on the side of the LED.
  • Another object of the present invention is to provide a light guide plate device including the light guide plate assembly and a light source.
  • a framed light guide plate device in which the light guide plate device and the frame are integrated.
  • the light guide plate assembly introduces light from a light source 20 from one end face 18 and emits light from one face 16 as shown in FIG. 1, for example.
  • a cover 30 formed to cover the light source 20 and the end face 18 in a longitudinal sectional view and sealing the end face 18, light emitted from the light source 20 and not entering the end face 18 And a cover 30 having a reflecting surface 32 to reflect light; light reflected by the reflecting surface 32 is also incident from the front and back surfaces 14 and 16 of the light guide plate 10.
  • light from the light source is incident from the end face of the light guide plate and is reflected by the reflective surface of the cover without being incident from the end face, and is diffused in the sealed space, resulting in the front and back Light from inside the light guide plate. Therefore, light from the light source can be efficiently guided into the light guide plate with a simple structure, and the light guide plate can be thinned.
  • the light guide plate assembly according to the second aspect of the present invention is, for example, as shown in FIG. 1, in the light guide plate assembly 6 of the first aspect, the reflecting surface 32 of the cover 30 has a curved line C1 in a longitudinal sectional view. , C2. According to this structure, the reflecting surface has a curve in a longitudinal sectional view, so that the reflected light is diffused in the sealed space, and it becomes easy to enter light from the front and back surfaces of the light guide plate, and light from the light source Is efficiently guided into the light guide plate.
  • the light guide plate assembly according to the third aspect of the present invention is, for example, as shown in FIG. 1, in the light guide plate assembly 6 of the second aspect, a plurality of curves C1 and C2 of the longitudinal cross sectional view of the reflecting surface 32 are plural. It is. According to this structure, the light reflected by the reflecting surface has a plurality of curves in the longitudinal cross-sectional view, and light is diffused in the sealed space, and light is easily incident from the front and back surfaces of the light guide plate. Light is efficiently introduced into the light guide plate.
  • the light guide plate assembly according to the fourth aspect of the present invention is, for example, as shown in FIG. 3, in the light guide plate assembly 6 of the second or third aspect, the reflective surface 32a of the cover 30 has smooth irregularities. Will be attached. According to this structure, since the reflection surface is provided with smooth asperities, the reflection of light becomes more random to create a diffused state, and the light from the light source is efficiently guided into the light guide plate.
  • the cover 30 is formed of an opaque resin. Ru. According to this structure, since the cover is formed of an opaque resin, the inner surface of the cover becomes a reflection surface as it is, and the light guide plate assembly is easy to manufacture and lightweight.
  • the reflection surface 32 is mirror finished.
  • the reflecting surface is mirror-finished to strongly reflect the light, so that the light from the light source can be more efficiently guided into the light guide plate.
  • the cover 30 is formed of metal in the light guide plate assembly 6 of any of the first to fourth aspects. According to this structure, since the cover is formed of metal, the inner surface of the cover becomes a reflection surface as it is, and the light guide plate assembly is easy to manufacture and has high strength.
  • a light guide plate device includes, for example, as shown in FIG. 1, the light guide plate assembly 6 according to any one of the first to seventh aspects; and a light source 20. With this configuration, it becomes a light guide plate device capable of efficiently guiding the light from the light source into the light guide plate with a simple structure.
  • the light source is the LED 22.
  • the light guide plate device has a long life, is lightweight, and is bright.
  • the cover 30 does not contact the light emitting portion of the LED 22 in the light guide plate device 1 of the ninth aspect.
  • the cover does not contact the light emitting portion of the LED, so light emitted from the LED and not incident from the end face of the light guide plate is easily reflected by the reflective surface in the space sealed by the cover to easily create a diffused state. Light is efficiently introduced into the light guide plate.
  • the light guide plate device is, for example, as shown in FIG. 1, in the light guide plate device 1 of the ninth or tenth aspect, the cover 30 is the substrate 24 of the LED 22. One end face 18 is sealed. According to this structure, the cover seals the one end face of the light guide plate with the LED substrate, so that the light is also reflected by the substrate and a light scattering state can be easily made in the sealed space, and the simple structure leads to easy manufacture. It becomes an optical plate device.
  • the light guide plate 10 has a width thin. Even with this configuration, the light emitted from the LED is efficiently guided into the light guide plate, so that the light guide plate device becomes bright.
  • a frame supporting the light guide plate device according to any of the ninth to twelfth aspects and a cover are integrated. It is formed. With this configuration, the number of parts and the number of manufacturing steps can be reduced, and the weight can be reduced.
  • a light guide plate assembly capable of efficiently guiding light from a light source into a light guide plate with a simple structure and making the light guide plate thin, a light guide plate device and a light guide plate device with a frame. it can.
  • FIG. 1 is a longitudinal sectional view of a light guide plate device according to an embodiment of the present invention, schematically showing a light path.
  • FIG. 2 is an exploded perspective view showing the light guide plate assembly and the light source of the light guide plate device according to the embodiment of the present invention.
  • FIG. 3 is a longitudinal sectional view of a light guide plate device according to another embodiment of the present invention.
  • FIG. 4 is a schematic view illustrating a method of measuring the illuminance of the light guide plate.
  • 5a to 5i are longitudinal cross-sectional views for explaining the cover shape of the light guide plate device used for the measurement.
  • FIG. 6 is a graph showing the results of measurement of the illuminance of the light emitting surface when the shape of the reflective surface of the cover of the light guide plate device in the longitudinal section is changed.
  • FIG. 7 is a schematic cross-sectional view showing an example of application of the light guide plate assembly and the light guide plate device, in which (a) shows a double-sided light emitting panel and (b) shows a curved light emitting panel.
  • FIG. 8 is a schematic cross-sectional view showing an example of a framed light guide plate device in which a cover and a frame are integrated, where (a) is a framed light guide plate device having an integral cover frame, and (b) is a two-piece type Fig. 6 shows a framed light guide plate device with a frame with cover.
  • FIG. 1 is a cross-sectional view (longitudinal cross-sectional view) in a plane orthogonal to the longitudinal axis (x direction in FIG. 2) of the light guide plate device 1
  • FIG. 2 is a light guide plate assembly 6 of the light guide plate device 1.
  • the light source 20 in an exploded perspective view.
  • the light guide plate assembly 6 has a light guide plate 10 that introduces light from the light source 20 from one end surface 18 and emits light from the light emitting surface 16 and a cover 30 that covers the one end surface 18 of the light guide plate 10 in a sealed manner.
  • the lower end surface of the cover 30 in FIG. 1 is open.
  • the lower end surface of the cover 30 is sealed by the base 24 of the light source 20. Therefore, one end face 18 of the light guide plate 10 is sealed by the cover 30 and the base 24.
  • “to seal” means to surround so that light does not leak.
  • the light guide plate 10 typically, reflective dots (not shown) are printed on one surface 14 of the front and back surfaces of the acrylic plate, and the reflective sheet 12 is pasted thereon, and the light emitting surface of the back surface of one surface 14 It emits light from 16
  • the reflective dots may be printed, shaped by laser, or shaped by V-cut.
  • substrate of the light-guide plate 10 is not limited to an acrylic plate, A well-known material may be sufficient, and the light-guide plate 10 can use a well-known light-guide plate.
  • the end face 18 on the light source 20 side be a surface with some roughness without smoothing finish, because incident light is scattered.
  • the reflection sheet 12 As the reflection sheet 12, a known reflection sheet which has high reflection efficiency and can be used at a temperature of about 100 ° C. can be used.
  • the reflective sheet 12 is not attached to one surface 14 of the portion covered by the cover 30. In addition, it is preferable not to print on the surface 14 of the portion covered by the cover 30 for the reflective dots, but printing may be performed on the portion.
  • the cover 30 may be formed, for example, of an opaque resin or metal.
  • opaque means not including translucent and impervious to light.
  • the cover 30 is formed long in the longitudinal direction so as to cover one end surface 18 of the light guide plate 10.
  • the two parts sandwiching the light guide plate 10 may be separately formed and fixed to the light guide plate 10 when assembled as the light guide plate assembly 6 or on the end face side in the longitudinal direction of the light guide plate 10
  • the two parts may be sandwiched and fixed.
  • a member (not shown) for connecting two parts on the end face side in the longitudinal direction of the light guide plate 10 may be provided to be integrally formed.
  • the lower part of the light source 20 may be integrally formed with a member (not shown) connecting the two parts.
  • the method of assembling the two parts is not particularly limited.
  • the cover 30 is formed with a recess so as to cover one end surface 18 of the light guide plate 10 and the LED 22 of the light source 20 described later.
  • the surface of this depression is the reflecting surface 32.
  • the cover 30 is formed of an opaque resin or metal so that light from the light source can be reflected by the reflective surface 32 without the reflective surface 32 being finished.
  • the mirror finish may be metal deposition or metal plating, and may be formed by a known method.
  • the light guide plate 10 and the cover 30 may be fixed by applying an adhesive 40 to the portion where the light guide plate 10 penetrates between the covers 30. By fixing the light guide plate 10 and the cover 30, the light guide plate assembly 6 is integrated.
  • attach is not limited to the method of using an adhesive agent, It may be well-known methods, such as thermocompression bonding.
  • the LED 22 has a width (length in the z direction in FIG. 2) of, for example, 3 mm to 5 mm.
  • the LEDs are arrayed at equal intervals, and light enters from the end face 18 side of the light guide plate 10, whereby light is diffused in the light guide plate 10 by scattering in the light guide plate 10.
  • a long linear light source such as an optical fiber may be used.
  • the light emitting surface of the LED 22 (upper surface in FIG. 1) and the one end surface 18 of the light guide plate 10 may be in close contact with or separated from each other.
  • the base 24 of the light source 20 is generally made of resin or aluminum.
  • the resin base is formed of opaque resin as in the case of the cover 30. In the case of a resin base, it is preferable to mirror finish like the reflective surface 32, and a silver tape may be attached.
  • the base 24 is combined with the cover 30 of the light guide plate device 1 to be in close contact with the lower end of the cover 30 to seal one end face 18 of the light guide plate 10 and the LED 22.
  • the cover 30 and the base 24 form a closed cavity 34 as shown in FIG.
  • the light in the cavity 34 is reflected by the reflective surface 32 of the cover 30 and is also reflected by the base 24 to be diffused in the cavity 34.
  • the “scattering state” refers to a state in which light in various directions is present in the space surrounded by the reflecting surface.
  • the light diffused in the cavity 34 enters the light guide plate 10 from the front and back surfaces 14
  • the cover 30 may be elongated in the longitudinal direction, and the end face in the longitudinal direction may be open. That is, of the light in the light scattering state in the cavity 34, the amount of light diffused from the end face in the longitudinal direction is very small.
  • a flat plate (not shown) formed of the same material as the cover 30.
  • the reflective surface 32 or the resin base is mirror-finished, in order to prevent oxidation of the mirror surface, between the cover 30 and the base 24, between the cover 30 and the light guide plate 10, and in the longitudinal direction
  • the space between the cover 30 and the flat plate at the end face may be sealed, and the inside of the cavity 34 may be replaced with an inert gas.
  • between the cover 30 and the base 24, between the cover 30 and the light guide plate 10, and between the cover 30 and the flat plate at the longitudinal end face in order to prevent contamination by dust etc. It may be sealed.
  • the general-purpose LED 22 often has an irradiation angle of 120 °. Therefore, when the thickness of the light guide plate 10 is thinner than the width of the LED 22, the light emitted by the LED 22 is not much incident on the end face 18 of the light guide plate 10. That is, sufficient light energy is not guided to the light guide plate 10, and the illuminance is insufficient.
  • the light emitted by the LED 22 and not incident on the end face 18 of the light guide plate 10 is first reflected by the reflection surface 32 of the cover 30. Since the LED 22 and the end face 18 of the light guide plate 10 are covered and sealed with the cover 30 and the base 24 of the light source 20, light not incident on the end face 18 of the light guide plate 10 is reflected by the reflective surface 32 and the base 24. It becomes a light scattering state inside. The light in the diffused state is guided from the front and back surfaces 14 and 16 of the light guide plate 10 into the light guide plate 10. In FIG.
  • the light reflected by the reflection surface 32 is drawn so as to be guided from the front and back surfaces 14 and 16 of the light guide plate 10 into the light guide plate 10 after one reflection, but it is not always necessary
  • the light may not be guided into the light guide plate 10 later, but may be guided into the light guide plate 10 after being reflected a plurality of times by the reflecting surface 32 and the base 24.
  • the light guided into the light guide plate 10 travels in the light guide plate 10, is reflected by the reflection dots, and is emitted from the surface 16 which is a light emitting surface.
  • the thickness of the light guide plate 10 can be thinner than the width 3 mm of the general-purpose LED.
  • the reflective surface 32 is illustrated as drawing an arc in a longitudinal sectional view (cross section shown in FIG. 1), but the shape of the reflective surface 32 is not limited.
  • the reflective surface 32 may have a shape having a plurality of curves C1 and C2. With the shape having the plurality of curves C1 and C2, light reflected by the reflection surface 32 can be easily guided from the front and back surfaces 14 and 16 into the light guide plate 10.
  • the curves C1 and C2 do not necessarily have to be arcs, and may be part of a known curve such as an ellipse, a sine wave, or an involute curve.
  • the plurality of curves indicate that the known curve as described above or a portion of the curve similar to the known curve is included.
  • FIG. 1 shows a shape having two curves C1 and C2, the number of curves is not limited.
  • FIG. 3 is a cross-sectional view showing the light guide plate device 2 and the light guide plate assembly 7 having a reflecting surface 32 a having another shape in a longitudinal cross sectional view.
  • smooth asperities 38 are attached to the reflective surface 32 shown in FIG. 1.
  • the smooth asperity 38 is formed on the surface of the reflecting surface 32 a viewed as a flat surface, not a cross sectional view.
  • the smooth asperity 38 is attached to the reflecting surface 32a, so that the light reflected by the reflecting surface 32a forms a light scattering state, and depending on the shapes of the light guide plate 10, the LED 22 and the reflecting surface 32, the light guide plate from the front and back surfaces 14 and 16 It becomes easy to be led into ten.
  • smooth means that it is not composed only of a plane and a corner, and a plane or a corner may be included.
  • the light guide plate 10 used for the measurement printed a reflective dot using a 1 mm thick acrylic plate with a size of 300 mm ⁇ 500 mm.
  • a white film of E6SR # 188 (thickness: 188 ⁇ m) manufactured by Toray Industries, Inc. was attached as the reflective sheet 12.
  • the reflective dots were printed on the entire surface of the acrylic plate, and the reflective sheet 12 was attached only to the outside of the cover 30.
  • LEDs 12 V, 4.32 W, 3 mm wide, 3 mm long and 0.5 mm thick manufactured by Nichia Corporation were used, and 30 LEDs were arranged at intervals of 10 mm on an aluminum base 24 of 300 mm.
  • the end face 18 of the light guide plate 10 and the LED 22 were disposed in contact with each other.
  • the cover 30 was molded using a white ABS resin using a 3D printer.
  • the outer diameter was 7 mm, the length was 300 mm, and the height was 6 mm in principle.
  • the cover 30 was molded with resin and was not mirror-finished. Moreover, the location where the light guide plate 10 penetrates the cover 30 was created so that there may be substantially no gap. In the light guide plate device 1 used for the measurement, fixing with an adhesive or the like was not performed.
  • the illuminance of the light guide plate 10 was measured with a light intensity meter (Dr. Meter DM-LX1330B) on the light emitting surface 16 of the light guide plate 10 as shown in the schematic view of FIG. The measurement was made at 27 measurement points of the light emitting surface 16 (9 places at intervals of 50 mm in the height direction and 3 places in the length direction), and the average illuminance was taken as the illuminance of the light guide plate 10.
  • Dr. Meter DM-LX1330B a light intensity meter
  • FIGS. 5a-5i are longitudinal sectional views of the light guide plate device 1 similarly to FIG.
  • R represents the radius of a curve that is an arc.
  • the cavity 34 between the light guide plate 10, the LED 22 and the cover 30 is almost eliminated.
  • the illuminance of the light guide plate 10 is 700 Lux, which is much lower than 2000 Lux, which is generally called practical illuminance, and is not practical. That is, only by covering the end face 18 of the light guide plate 10 and the LED 22 with the cover 30, a desired illuminance can not be obtained.
  • the reflecting surface 32 is a flat surface, and a cavity 34 having a substantially regular triangle shape is formed in a cross sectional view.
  • the illuminance of the light guide plate 10 was 1000 Lux, and the illuminance was improved compared to the shape 1. However, practical illuminance was not obtained. Measurement was also performed while changing the area of the cavity 34 in a cross sectional view, that is, the volume and the inclination angle of the plane while keeping the reflecting surface 32 flat, but little improvement in the illuminance was observed.
  • the space of the shape 3 has a shape that narrows upward from the same width as the LED 22 and with a shoulder.
  • the illuminance was further improved than in the shape 3 and became 1500 Lux.
  • the width and height of the space of the shape 4 are expanded. That is, a space is formed on the side of the LED 22 so that the cover 30 does not contact the LED 22. As a result, the illuminance increased to 1800 Lux and approached the practical level.
  • the width of the cavity 34 is wider than the shape 5.
  • the illuminance reached a practical level of 2000 Lux.
  • the shape of the upper portion where the reflective surface 32 contacts the light guide plate 10 is smoothed. That is, the curvatures of the reflecting surface having two curves in cross-sectional view are both increased, and it is clarified that two curves are included. As a result, the illuminance improved to 2200 Lux.
  • the illuminance is reduced to 2700 Lux.
  • the area of the cavity 34 was further increased, the illuminance decreased significantly.
  • the light guide plate assembly and the light guide plate device according to the present invention can obtain sufficient illuminance even with a thin light guide plate by a simple device. Therefore, it can contribute to the saving of materials and the weight reduction. Furthermore, as shown, for example, in FIG. 7, it is possible to expand the application of the light guide plate. As shown to the schematic diagram of Fig.7 (a), a light-guide plate of 2 sheets can be bonded together, and it can be set as a double-sided light emission panel. Moreover, as shown to the schematic diagram of FIG.7 (b), it can also be set as the light emission panel of a curved surface by bending a thin light-guide plate.
  • the framed light guide plate devices 50 and 52 integrated with the frame for supporting the light guide plate devices 1 and 2 will be described.
  • the light guide plate devices 1 and 2 in order to use as a display device, it is necessary to support the light guide plate devices 1 and 2 at a predetermined place.
  • the conventional light guide plate device since the light guide plate itself is thick and heavy, it is often supported by an aluminum frame surrounding the light guide plate and the light source.
  • the light guide plate 10 can be thinned, and the light guide plate devices 1 and 2 also become lightweight. Therefore, instead of the frame surrounding the conventional light guide plate device, it is possible to use the covers 60 and 62 formed integrally with the frame.
  • the frame attached cover is expanded in the lateral direction (the thickness direction of the light guide plate 10) and surrounds the light source 20 as compared with the cover 30 shown in FIG. Use 60.
  • the framed cover 60 is integrally formed of resin or metal.
  • the light source 20 can be inserted from the end of the framed cover 60.
  • the framed light guide plate device 50 can be supported.
  • the framed cover 62 shown in FIG. 8A is composed of a two-part framed cover 62. That is, the light guide plate 10 and the light source 20 are sandwiched by two parts.
  • the framed cover 62 is formed of resin or metal.
  • the framed cover 62 has a fixed slide 64 in order to facilitate fixing the frame light guide plate device 52 to the structure.
  • the framed light guide plate device 52 can be fixed by fitting the fixed slide 64 to the channel type rail.
  • the integral framed cover 60 may have a fixed slide, and the two-piece framed cover 62 may not have the fixed slide 64.
  • the outer shape of the framed covers 60 and 62 is not particularly limited.
  • the frames are integrally formed, the conventionally used frame is not necessary, the number of parts and the number of manufacturing steps can be reduced, and weight reduction can be achieved.

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Abstract

[Problem] To provide a light guide plate assembly, a light guide plate device, and a light guide plate device with a frame, configured so as to efficiently guide light from a light source into a light guide plate using a simple structure, such that the light guide plate adequately emits light even when thin. [Solution] A light guide plate assembly (6) is provided with: a light guide plate (10) in which light from a light source (20) is introduced from one end face (18) and is emitted from one surface (16); and a cover (30) for sealing the one end face (18), said cover (30) being formed so as to cover the light source (20) and the one end face (18) in cross-sectional view in the long direction, and said cover (30) having a reflective surface (32) for reflecting light that is emitted from the light source (20) but does not impinge on the end face (18). The light reflected by the reflective surface (32) is also incident from the surfaces (14) (16) on the front and back of the light guide plate (10).

Description

導光板組立体、導光板装置およびフレーム付き導光板装置Light guide plate assembly, light guide plate device and light guide plate device with frame
　本発明は、光源からの光を導光板内に効率よく導くようにした導光板組立体、該導光板組立体を備える導光板装置、および、該導光板装置とフレームを一体化したフレーム付き導光板装置に関する。 The present invention is directed to a light guide plate assembly for efficiently guiding light from a light source into a light guide plate, a light guide plate device including the light guide plate assembly, and a framed light guide in which the light guide plate device and a frame are integrated. The present invention relates to a light plate device.
　ＬＥＤを光源として用い、ＬＥＤで発光した光を導光板の端面から入射し、導光板の発光する面を全面的に発光させる表示装置が実用されてきている。導光板は、透明性を高めることからアクリル樹脂製であることが多い。一方、ＬＥＤは、標準で３～５ｍｍの幅を有している。そこで、導光板は、端面からＬＥＤの光を入射するために、３ｍｍ以上の厚さを有しているのが一般的である。アクリル製の導光板では、３ｍｍ以上の厚さがあると、曲面に曲げることは困難であった。 There has been put into practical use a display device which uses an LED as a light source and which emits light emitted by the LED from an end face of the light guide plate to cause the light emitting surface of the light guide plate to emit light entirely. The light guide plate is often made of an acrylic resin in order to enhance the transparency. On the other hand, LEDs have a width of 3 to 5 mm as a standard. Therefore, the light guide plate generally has a thickness of 3 mm or more in order to allow the light of the LED to be incident from the end face. With an acrylic light guide plate, it is difficult to bend it to a curved surface if the thickness is 3 mm or more.
　一方、導光板を薄くすると、素材の節約、軽量化、さらには、導光板を曲げることにより曲面の導光板が作成できるなど、メリットは多い。 On the other hand, when the light guide plate is made thinner, there are many merits such as saving of materials, weight saving, and further, a curved light guide plate can be created by bending the light guide plate.
　そこで、薄い導光板を使用できるように光源からの光を導光板に集光するため、レンズを配置するという発明（特許文献１参照）や、光源の背後に反射鏡を設ける発明（特許文献２参照）、ＬＥＤの側方の反射板のプリズムにより光を前方へ反射させる発明（特許文献３）が提案されている。 Therefore, in order to condense the light from the light source on the light guide plate so that a thin light guide plate can be used, an invention of arranging a lens (see Patent Document 1) or an invention of providing a reflecting mirror behind the light source (Patent Document 2) Patent Document 3 proposes an invention in which light is reflected forward by a prism of a reflector on the side of the LED.
　しかし、レンズを使うと、レンズ自体に吸収される光もあり光源の光をすべて導光板に導くことができず、さらに、光源回りの装置が大型で複雑になるという問題を生ずる。また、光源の背後に反射鏡を設けても、やはり光源回りの装置が大型で複雑になるという問題を生ずる。また、側方の反射板のプリズムにより光を前方へ反射させようとしても、すべての光が前方へ反射されるわけではなく、所望の効果が得られないという問題がある。 However, when a lens is used, some of the light absorbed by the lens itself can not be guided to the light guide plate, and there is a further problem that the apparatus surrounding the light source becomes large and complicated. In addition, even if a reflector is provided behind the light source, there is still a problem that the apparatus around the light source becomes large and complicated. Further, even if it is attempted to reflect light forward by the prisms of the side reflectors, not all light is reflected forward, and there is a problem that a desired effect can not be obtained.
　そのために、期待する効果が十分に得られるほどに薄い導光板は実用化されてはいないのが、実状である。 For this reason, it is a fact that a light guide plate that is thin enough to obtain the expected effect is not put to practical use.
　そこで本発明は、導光板が薄くても十分に発光するように、簡易な構造で光源からの光を導光板内に効率よく導くようにした導光板組立体を提供することを課題とする。また、その導光板組立体と光源とを備える導光板装置を提供することを課題とする。さらに、その導光板装置とフレームを一体化したフレーム付き導光板装置を提供することを課題とする。 Therefore, it is an object of the present invention to provide a light guide plate assembly in which light from a light source is efficiently guided into a light guide plate with a simple structure so that light is sufficiently emitted even if the light guide plate is thin. Another object of the present invention is to provide a light guide plate device including the light guide plate assembly and a light source. Further, it is an object of the present invention to provide a framed light guide plate device in which the light guide plate device and the frame are integrated.
特開２００７－３０５５３４号公報JP 2007-305534 A 特開２０１３－４５６４１号公報JP 2013-45641 A 特開２００６－２８６３４８号公報Unexamined-Japanese-Patent No. 2006-286348
　上記課題を解決するために、本発明の第一の態様に係る導光板組立体は、例えば図１に示すように、光源２０からの光を一端面１８から導入し、一方の面１６から発光する導光板１０と；長手方向断面視で光源２０と一端面１８とを覆うように形成され一端面１８を密閉するためのカバー３０であって、光源２０から発光し端面１８に入射しない光を反射する反射面３２を有するカバー３０とを備え；反射面３２で反射された光は、導光板１０の表裏の面１４、１６からも入射する。 In order to solve the above problems, the light guide plate assembly according to the first aspect of the present invention introduces light from a light source 20 from one end face 18 and emits light from one face 16 as shown in FIG. 1, for example. A cover 30 formed to cover the light source 20 and the end face 18 in a longitudinal sectional view and sealing the end face 18, light emitted from the light source 20 and not entering the end face 18 And a cover 30 having a reflecting surface 32 to reflect light; light reflected by the reflecting surface 32 is also incident from the front and back surfaces 14 and 16 of the light guide plate 10.
　このように構成すると、光源からの光は、導光板の端面から入射するほかに、端面から入射しなくても、カバーの反射面により反射され、密閉された空間内で散光し、その結果表裏の面から導光板内に入射する。よって、簡易な構造で光源からの光は効率よく導光板内に導かれ、また、導光板を薄くすることができる。 According to this structure, light from the light source is incident from the end face of the light guide plate and is reflected by the reflective surface of the cover without being incident from the end face, and is diffused in the sealed space, resulting in the front and back Light from inside the light guide plate. Therefore, light from the light source can be efficiently guided into the light guide plate with a simple structure, and the light guide plate can be thinned.
　本発明の第二の態様に係る導光板組立体は、例えば図１に示すように、第一の態様の導光板組立体６において、カバー３０の反射面３２は、長手方向断面視で曲線Ｃ１、Ｃ２を有する。このように構成すると、反射面が長手方向断面視で曲線を有することにより、反射した光が密閉された空間内で散光し、導光板の表裏の面から入光し易くなり、光源からの光は効率よく導光板内に導かれる。 The light guide plate assembly according to the second aspect of the present invention is, for example, as shown in FIG. 1, in the light guide plate assembly 6 of the first aspect, the reflecting surface 32 of the cover 30 has a curved line C1 in a longitudinal sectional view. , C2. According to this structure, the reflecting surface has a curve in a longitudinal sectional view, so that the reflected light is diffused in the sealed space, and it becomes easy to enter light from the front and back surfaces of the light guide plate, and light from the light source Is efficiently guided into the light guide plate.
　本発明の第三の態様に係る導光板組立体は、例えば図１に示すように、第二の態様の導光板組立体６において、反射面３２の長手方向断面視の曲線Ｃ１、Ｃ２は複数である。このように構成すると、反射面が長手方向断面視で複数の曲線を有することにより反射した光が密閉された空間内で散光し、導光板の表裏の面から入光し易くなり、光源からの光は効率よく導光板内に導かれる。 The light guide plate assembly according to the third aspect of the present invention is, for example, as shown in FIG. 1, in the light guide plate assembly 6 of the second aspect, a plurality of curves C1 and C2 of the longitudinal cross sectional view of the reflecting surface 32 are plural. It is. According to this structure, the light reflected by the reflecting surface has a plurality of curves in the longitudinal cross-sectional view, and light is diffused in the sealed space, and light is easily incident from the front and back surfaces of the light guide plate. Light is efficiently introduced into the light guide plate.
　本発明の第四の態様に係る導光板組立体は、例えば図３に示すように、第二または第三の態様の導光板組立体６において、カバー３０の反射面３２ａには、滑らかな凹凸が付けられる。このように構成すると、反射面には滑らかな凹凸が付けられるので光の反射がよりランダムになって散光状態を作り、光源からの光は効率よく導光板内に導かれる。 The light guide plate assembly according to the fourth aspect of the present invention is, for example, as shown in FIG. 3, in the light guide plate assembly 6 of the second or third aspect, the reflective surface 32a of the cover 30 has smooth irregularities. Will be attached. According to this structure, since the reflection surface is provided with smooth asperities, the reflection of light becomes more random to create a diffused state, and the light from the light source is efficiently guided into the light guide plate.
　本発明の第五の態様に係る導光板組立体は、例えば図１に示すように、第一ないし第四のいずれかの態様の導光板組立体６において、カバー３０が不透明な樹脂で形成される。このように構成すると、カバーが不透明な樹脂で形成されるのでカバーの内面がそのままで反射面となり、製造が容易で軽量な導光板組立体となる。 In the light guide plate assembly according to the fifth aspect of the present invention, for example, as shown in FIG. 1, in the light guide plate assembly 6 according to any one of the first to fourth aspects, the cover 30 is formed of an opaque resin. Ru. According to this structure, since the cover is formed of an opaque resin, the inner surface of the cover becomes a reflection surface as it is, and the light guide plate assembly is easy to manufacture and lightweight.
　本発明の第六の態様に係る導光板組立体は、例えば図１に示すように、第五の態様の導光板組立体６において、反射面３２が鏡面仕上げされる。このように構成すると、反射面が鏡面仕上げされ光を強く反射するので、より効率よく光源からの光を導光板内に導くことができる。 In the light guide plate assembly according to the sixth aspect of the present invention, for example, as shown in FIG. 1, in the light guide plate assembly 6 of the fifth aspect, the reflection surface 32 is mirror finished. According to this structure, the reflecting surface is mirror-finished to strongly reflect the light, so that the light from the light source can be more efficiently guided into the light guide plate.
　本発明の第七の態様に係る導光板組立体は、例えば図１に示すように、第一ないし第四のいずれかの態様の導光板組立体６において、カバー３０が金属で形成される。このように構成すると、カバーが金属で形成されるのでカバーの内面がそのままで反射面となり、製造が容易で高強度の導光板組立体となる。 In the light guide plate assembly according to the seventh aspect of the present invention, for example, as shown in FIG. 1, the cover 30 is formed of metal in the light guide plate assembly 6 of any of the first to fourth aspects. According to this structure, since the cover is formed of metal, the inner surface of the cover becomes a reflection surface as it is, and the light guide plate assembly is easy to manufacture and has high strength.
　本発明の第八の態様に係る導光板装置は、例えば図１に示すように、第一ないし第七のいずれかの態様の導光板組立体６と；光源２０とを備える。このように構成すると、簡易な構造で光源からの光を効率よく導光板内に導くことができる導光板装置となる。 A light guide plate device according to an eighth aspect of the present invention includes, for example, as shown in FIG. 1, the light guide plate assembly 6 according to any one of the first to seventh aspects; and a light source 20. With this configuration, it becomes a light guide plate device capable of efficiently guiding the light from the light source into the light guide plate with a simple structure.
　本発明の第九の態様に係る導光板装置は、例えば図１に示すように、第八の態様の導光板装置１において、光源がＬＥＤ２２である。このように構成すると、光源がＬＥＤであるので、寿命が長く軽量で明るい導光板装置となる。 In the light guide plate device according to the ninth aspect of the present invention, for example, as shown in FIG. 1, in the light guide plate device 1 of the eighth aspect, the light source is the LED 22. With this configuration, since the light source is an LED, the light guide plate device has a long life, is lightweight, and is bright.
　本発明の第十の態様に係る導光板装置は、例えば図１に示すように、第九の態様の導光板装置１において、カバー３０がＬＥＤ２２の発光部に接触しない。このように構成すると、カバーがＬＥＤの発光部に接触しないので、ＬＥＤから発光し導光板の端面から入射しない光は、カバーにより密閉された空間内で反射面により反射され散光状態を作り易く、光は効率よく導光板内に導かれる。 In the light guide plate device according to the tenth aspect of the present invention, for example, as shown in FIG. 1, the cover 30 does not contact the light emitting portion of the LED 22 in the light guide plate device 1 of the ninth aspect. With this configuration, the cover does not contact the light emitting portion of the LED, so light emitted from the LED and not incident from the end face of the light guide plate is easily reflected by the reflective surface in the space sealed by the cover to easily create a diffused state. Light is efficiently introduced into the light guide plate.
　本発明の第十一の態様に係る導光板装置は、例えば図１に示すように、第九または第十の態様の導光板装置１において、カバー３０がＬＥＤ２２の基板２４とで導光板１０の一端面１８を密閉する。このように構成すると、カバーがＬＥＤの基板とで導光板の一端面を密閉するので、光は基盤でも反射し密閉された空間内で散光状態を作り易く、簡易な構造で製造の容易な導光板装置となる。 The light guide plate device according to the eleventh aspect of the present invention is, for example, as shown in FIG. 1, in the light guide plate device 1 of the ninth or tenth aspect, the cover 30 is the substrate 24 of the LED 22. One end face 18 is sealed. According to this structure, the cover seals the one end face of the light guide plate with the LED substrate, so that the light is also reflected by the substrate and a light scattering state can be easily made in the sealed space, and the simple structure leads to easy manufacture. It becomes an optical plate device.
　本発明の第十二の態様に係る導光板装置は、例えば図１に示すように、第九ないし第十一のいずれかの態様の導光板装置１において、導光板１０が、ＬＥＤ２２の幅より薄い。このように構成しても、ＬＥＤから発光した光は効率よく導光板内に導かれるので、明るい導光板装置となる。 In the light guide plate device according to the twelfth aspect of the present invention, for example, as shown in FIG. 1, in the light guide plate device 1 according to any one of the ninth to eleventh aspects, the light guide plate 10 has a width thin. Even with this configuration, the light emitted from the LED is efficiently guided into the light guide plate, so that the light guide plate device becomes bright.
　本発明の第十三の態様に係るフレーム付き導光板装置は、たとえば図８に示すように、第九ないし第十二のいずれかの態様の導光板装置を支えるフレームと、カバーとが一体に形成される。このように構成すると、部品数や製造工程を少なくできると共に、軽量化が図れる。 In the framed light guide plate device according to the thirteenth aspect of the present invention, for example, as shown in FIG. 8, a frame supporting the light guide plate device according to any of the ninth to twelfth aspects and a cover are integrated. It is formed. With this configuration, the number of parts and the number of manufacturing steps can be reduced, and the weight can be reduced.
　本発明によれば、簡易な構造で光源からの光を導光板内に効率よく導くことができ、導光板を薄くできる導光板組立体、導光板装置およびフレーム付き導光板装置を提供することができる。 According to the present invention, it is possible to provide a light guide plate assembly capable of efficiently guiding light from a light source into a light guide plate with a simple structure and making the light guide plate thin, a light guide plate device and a light guide plate device with a frame. it can.
　この出願は、日本国で２０１５年４月２２日に出願された特願２０１５－８７３９９号に基づいており、その内容は本出願の内容として、その一部を形成する。
　また、本発明は以下の詳細な説明により更に完全に理解できるであろう。しかしながら、詳細な説明および特定の実施例は、本発明の望ましい実施の形態であり、説明の目的のためにのみ記載されているものである。この詳細な説明から、種々の変更、改変が、当業者にとって明らかだからである。
　出願人は、記載された実施の形態のいずれをも公衆に献上する意図はなく、開示された改変、代替案のうち、特許請求の範囲内に文言上含まれないかもしれないものも、均等論下での発明の一部とする。
　本明細書あるいは請求の範囲の記載において、名詞及び同様な指示語の使用は、特に指示されない限り、または文脈によって明瞭に否定されない限り、単数および複数の両方を含むものと解釈すべきである。本明細書中で提供されたいずれの例示または例示的な用語（例えば、「等」）の使用も、単に本発明を説明し易くするという意図であるに過ぎず、特に請求の範囲に記載しない限り本発明の範囲に制限を加えるものではない。 This application is based on Japanese Patent Application No. 2015-87399 filed on April 22, 2015 in Japan, the contents of which form a part of the contents of this application.
The invention will also be more fully understood from the following detailed description. However, the detailed description and the specific examples are the preferred embodiments of the present invention and are described for the purpose of illustration only. Various changes and modifications are apparent to those skilled in the art from this detailed description.
The applicant does not intend to provide the public with any of the described embodiments, and among the disclosed modifications, alternatives, which may not be literally included within the scope of the claims, is equivalent. As part of the invention under discussion.
In the description or the description of the claims, the use of nouns and similar indicators should be construed as including both the singular and the plural unless the context clearly dictates otherwise. The use of any of the exemplary or exemplary terms (eg, "such as") provided herein is merely intended to facilitate the description of the invention and is not specifically recited in the claims. As long as it does not limit the scope of the present invention.
図１は、本発明の一実施の形態の導光板装置の長手方向断面図であり、光の経路を模式的に示す。FIG. 1 is a longitudinal sectional view of a light guide plate device according to an embodiment of the present invention, schematically showing a light path. 図２は、本発明の一実施の形態の導光板装置の導光板組立体と光源とを分解して示す斜視図である。FIG. 2 is an exploded perspective view showing the light guide plate assembly and the light source of the light guide plate device according to the embodiment of the present invention. 図３は、本発明の別の実施の形態の導光板装置の長手方向断面図である。FIG. 3 is a longitudinal sectional view of a light guide plate device according to another embodiment of the present invention. 図４は、導光板の照度の測定方法を説明する模式図である。FIG. 4 is a schematic view illustrating a method of measuring the illuminance of the light guide plate. 図５ａから図５ｉは、測定に用いた導光板装置のカバー形状を説明する長手方向断面図である。5a to 5i are longitudinal cross-sectional views for explaining the cover shape of the light guide plate device used for the measurement. 図６は、導光板装置のカバーの反射面の、長手方向断面における形状を変えたときの、発光面の照度を測定した結果を示すグラフである。FIG. 6 is a graph showing the results of measurement of the illuminance of the light emitting surface when the shape of the reflective surface of the cover of the light guide plate device in the longitudinal section is changed. 図７は、導光板組立体および導光板装置の用途の一例を示す模式断面図で、（ａ）は両面発光パネル、（ｂ）は曲面の発光パネルを示す。FIG. 7 is a schematic cross-sectional view showing an example of application of the light guide plate assembly and the light guide plate device, in which (a) shows a double-sided light emitting panel and (b) shows a curved light emitting panel. 図８は、カバーとフレームを一体化したフレーム付き導光板装置の一例を示す模式断面図で、（ａ）は一体型のカバー付きフレームを有するフレーム付き導光板装置、（ｂ）は二体型のカバー付きフレームを有するフレーム付き導光板装置を示す。FIG. 8 is a schematic cross-sectional view showing an example of a framed light guide plate device in which a cover and a frame are integrated, where (a) is a framed light guide plate device having an integral cover frame, and (b) is a two-piece type Fig. 6 shows a framed light guide plate device with a frame with cover.
　以下、図面を参照して、本発明の実施の形態について説明する。なお、各図において、互いに同一または相当する装置には同一符号を付し、重複した説明は省略する。図１は、導光板装置１の長手方向軸（図２のｘ方向）に直交する面での断面図（長手方向断面図）であり、図２は、導光板装置１の導光板組立体６と光源２０とを分解して示す斜視図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, devices which are the same as or correspond to each other are given the same reference numerals, and repeated descriptions are omitted. FIG. 1 is a cross-sectional view (longitudinal cross-sectional view) in a plane orthogonal to the longitudinal axis (x direction in FIG. 2) of the light guide plate device 1, and FIG. 2 is a light guide plate assembly 6 of the light guide plate device 1. And the light source 20 in an exploded perspective view.
　導光板組立体６は、光源２０からの光を一端面１８から導入して発光面１６から発光する導光板１０と、導光板１０の一端面１８を密閉できるように覆うカバー３０とを有する。カバー３０の図１における下方の端面は開放されている。本実施の形態では、カバー３０の下方の端面は、光源２０の基盤２４で封止される。よって、カバー３０と基盤２４で導光板１０の一端面１８を密閉する。ここで、「密閉する」とは、光が漏れないように囲むことをいう。 The light guide plate assembly 6 has a light guide plate 10 that introduces light from the light source 20 from one end surface 18 and emits light from the light emitting surface 16 and a cover 30 that covers the one end surface 18 of the light guide plate 10 in a sealed manner. The lower end surface of the cover 30 in FIG. 1 is open. In the present embodiment, the lower end surface of the cover 30 is sealed by the base 24 of the light source 20. Therefore, one end face 18 of the light guide plate 10 is sealed by the cover 30 and the base 24. Here, "to seal" means to surround so that light does not leak.
　導光板１０は、典型的にはアクリル板の表裏の面の一方の面１４に反射ドット（不図示）をプリントし、その上から反射シート１２を貼付し、一方の面１４の裏面の発光面１６から発光する。反射ドットは、プリントしても、レーザにより成形しても、Ｖカットにより成形してもよい。なお、導光板１０の基板は、アクリル板には限定されず、公知の材質でよく、導光板１０は公知の導光板を用いることができる。また、光源２０側の端面１８は、平滑仕上げをせずに、多少のざらつきの面とするのが、入射する光が散乱するので好ましい。またその他の端面は反射シートで覆い、光が逸散しないようにすることが好ましい。 In the light guide plate 10, typically, reflective dots (not shown) are printed on one surface 14 of the front and back surfaces of the acrylic plate, and the reflective sheet 12 is pasted thereon, and the light emitting surface of the back surface of one surface 14 It emits light from 16 The reflective dots may be printed, shaped by laser, or shaped by V-cut. In addition, the board | substrate of the light-guide plate 10 is not limited to an acrylic plate, A well-known material may be sufficient, and the light-guide plate 10 can use a well-known light-guide plate. Further, it is preferable that the end face 18 on the light source 20 side be a surface with some roughness without smoothing finish, because incident light is scattered. In addition, it is preferable to cover the other end face with a reflective sheet so that light does not dissipate.
　反射シート１２としては、反射効率がよく、１００℃程度の温度で使用できる公知の反射シートを用いることができる。なお、カバー３０に覆われる部分の一方の面１４には反射シート１２を貼付しない。また、反射ドットについては、カバー３０に覆われる部分の面１４にはプリントしない方が好ましいが、当該部分にプリントしてもよい。 As the reflection sheet 12, a known reflection sheet which has high reflection efficiency and can be used at a temperature of about 100 ° C. can be used. The reflective sheet 12 is not attached to one surface 14 of the portion covered by the cover 30. In addition, it is preferable not to print on the surface 14 of the portion covered by the cover 30 for the reflective dots, but printing may be performed on the portion.
　カバー３０は、たとえば不透明な樹脂または金属で形成されるのがよい。ここで、不透明とは、半透明を含まず、光を通さないことを指す。カバー３０は、導光板１０の一端面１８を覆うように、長手方向に長く形成される。なお、導光板１０を挟んで２つの部分は、別体として形成されて導光板組立体６として組み立てるときに、導光板１０に固着されてもよいし、導光板１０の長手方向の端面側にて２つの部分を挟み込み固着してもよい。または、導光板１０の長手方向の端面側にて２つの部分を連結する部材（不図示）を備えて、一体として形成されてもよい。あるいは、光源２０の下部で２つの部分を連結する部材（不図示）を備えて、一体として形成されてもよい。２つの部分の組み立て方は特に限定されない。 The cover 30 may be formed, for example, of an opaque resin or metal. Here, opaque means not including translucent and impervious to light. The cover 30 is formed long in the longitudinal direction so as to cover one end surface 18 of the light guide plate 10. The two parts sandwiching the light guide plate 10 may be separately formed and fixed to the light guide plate 10 when assembled as the light guide plate assembly 6 or on the end face side in the longitudinal direction of the light guide plate 10 The two parts may be sandwiched and fixed. Alternatively, a member (not shown) for connecting two parts on the end face side in the longitudinal direction of the light guide plate 10 may be provided to be integrally formed. Alternatively, the lower part of the light source 20 may be integrally formed with a member (not shown) connecting the two parts. The method of assembling the two parts is not particularly limited.
　カバー３０は、導光板１０の一端面１８および後述する光源２０のＬＥＤ２２を覆うように、窪みが形成される。この窪みの表面が反射面３２である。カバー３０が、不透明な樹脂または金属で形成されることにより、反射面３２に仕上げをしなくても光源からの光を反射面３２で反射することができる。ただし、反射面３２を鏡面仕上げした方が、より反射が強くなるので好ましい。鏡面仕上げは、金属蒸着でも、金属メッキでもよく、公知の方法で形成すればよい。また、導光板１０がカバー３０の間を貫通する部分に、接着剤４０を塗布して、導光板１０とカバー３０を固着してもよい。導光板１０とカバー３０を固着することにより、導光板組立体６として一体化される。なお、固着する方法は、接着剤を用いる方法に限定されず、熱圧着等公知の方法でよい。 The cover 30 is formed with a recess so as to cover one end surface 18 of the light guide plate 10 and the LED 22 of the light source 20 described later. The surface of this depression is the reflecting surface 32. The cover 30 is formed of an opaque resin or metal so that light from the light source can be reflected by the reflective surface 32 without the reflective surface 32 being finished. However, it is preferable to mirror finish the reflecting surface 32 because the reflection is stronger. The mirror finish may be metal deposition or metal plating, and may be formed by a known method. Alternatively, the light guide plate 10 and the cover 30 may be fixed by applying an adhesive 40 to the portion where the light guide plate 10 penetrates between the covers 30. By fixing the light guide plate 10 and the cover 30, the light guide plate assembly 6 is integrated. In addition, the method to adhere | attach is not limited to the method of using an adhesive agent, It may be well-known methods, such as thermocompression bonding.
　光源２０は、図２に示すように、市販の基盤２４上に複数のＬＥＤ２２を配列したものを用いることができる。ＬＥＤ２２としては、汎用品では、例えば幅（図２のｚ方向の長さ）が３ｍｍ～５ｍｍである。ＬＥＤを等間隔で配列し、導光板１０の一端面１８側から入光することにより、光は導光板１０内での散乱により導光板１０内全体に拡散する。光源としては、光ファイバのような長い線状の光源を用いてもよい。なお、ＬＥＤ２２の発光面（図１の上面）と導光板１０の一端面１８とは、密着していてもよいし、離れていてもよい。 As the light source 20, as shown in FIG. 2, what arranged several LED22 on the commercially available board | substrate 24 can be used. For the general-purpose product, the LED 22 has a width (length in the z direction in FIG. 2) of, for example, 3 mm to 5 mm. The LEDs are arrayed at equal intervals, and light enters from the end face 18 side of the light guide plate 10, whereby light is diffused in the light guide plate 10 by scattering in the light guide plate 10. As a light source, a long linear light source such as an optical fiber may be used. The light emitting surface of the LED 22 (upper surface in FIG. 1) and the one end surface 18 of the light guide plate 10 may be in close contact with or separated from each other.
　光源２０の基盤２４は、一般的に樹脂製またはアルミ製である。なお、樹脂製基盤ではカバー３０と同様に、不透明な樹脂で形成される。樹脂製基盤の場合には、反射面３２と同様に鏡面仕上げをするのが好ましく、銀テープを貼付してもよい。基盤２４は、導光板装置１のカバー３０と組み合わされて、カバー３０の下端と密着し、導光板１０の一端面１８とＬＥＤ２２を密閉する。カバー３０と基盤２４で、図１に示すように閉じた空洞３４を形成する。なお、ＬＥＤ２２の側面とカバー３０との間に空隙があるのが好ましい。空洞３４内の光は、カバー３０の反射面３２で反射されるとともに、基盤２４でも反射され、空洞３４内で散光状態となる。なおここで、「散光状態」とは、反射する面に囲まれた空間内にいろいろな方向の光が存在する状態を指す。空洞３４内で散光状態となっている光は、図１に示すように、表裏の面１４、１６から導光板１０内に入光する。 The base 24 of the light source 20 is generally made of resin or aluminum. The resin base is formed of opaque resin as in the case of the cover 30. In the case of a resin base, it is preferable to mirror finish like the reflective surface 32, and a silver tape may be attached. The base 24 is combined with the cover 30 of the light guide plate device 1 to be in close contact with the lower end of the cover 30 to seal one end face 18 of the light guide plate 10 and the LED 22. The cover 30 and the base 24 form a closed cavity 34 as shown in FIG. In addition, it is preferable that there is a gap between the side surface of the LED 22 and the cover 30. The light in the cavity 34 is reflected by the reflective surface 32 of the cover 30 and is also reflected by the base 24 to be diffused in the cavity 34. Here, the “scattering state” refers to a state in which light in various directions is present in the space surrounded by the reflecting surface. The light diffused in the cavity 34 enters the light guide plate 10 from the front and back surfaces 14 and 16 as shown in FIG.
　なお、図２からも明らかなように、カバー３０は長手方向に長く形成されており、長手方向の端面は開放されていてもよい。すなわち、空洞３４内で散光状態にある光のうち、長手方向の端面から散逸する光は微量だからである。ただし、ＬＥＤ２２からカバー３０の長手方向端面までの長さが短い場合には、端面をカバー３０と同材で形成した平板（不図示）などで密閉するのがよい。 As apparent from FIG. 2, the cover 30 may be elongated in the longitudinal direction, and the end face in the longitudinal direction may be open. That is, of the light in the light scattering state in the cavity 34, the amount of light diffused from the end face in the longitudinal direction is very small. However, when the length from the LED 22 to the end face in the longitudinal direction of the cover 30 is short, it is preferable to seal the end face with a flat plate (not shown) formed of the same material as the cover 30.
　反射面３２や樹脂基盤が鏡面仕上げをされている場合には、鏡面の酸化を防止するために、カバー３０と基盤２４との間、カバー３０と導光板１０との間、並びに、長手方向の端面でのカバー３０と平板との間を密封し、空洞３４内を不活性ガスで置換してもよい。あるいは、粉塵などにより汚染されることを防止するために、カバー３０と基盤２４との間、カバー３０と導光板１０との間、並びに、長手方向の端面でのカバー３０と平板との間を密封してもよい。 When the reflective surface 32 or the resin base is mirror-finished, in order to prevent oxidation of the mirror surface, between the cover 30 and the base 24, between the cover 30 and the light guide plate 10, and in the longitudinal direction The space between the cover 30 and the flat plate at the end face may be sealed, and the inside of the cavity 34 may be replaced with an inert gas. Alternatively, between the cover 30 and the base 24, between the cover 30 and the light guide plate 10, and between the cover 30 and the flat plate at the longitudinal end face, in order to prevent contamination by dust etc. It may be sealed.
　次に、図１を参照して、導光板装置１の作用について説明する。汎用のＬＥＤ２２は、照射角度１２０°であることが多い。そのため、ＬＥＤ２２の幅より導光板１０の厚さが薄いと、ＬＥＤ２２で発光した光のうち導光板１０の端面１８に入射しない光が多くなる。すなわち、導光板１０には十分な光エネルギが導かれず、照度が不足することになる。 Next, the operation of the light guide plate device 1 will be described with reference to FIG. The general-purpose LED 22 often has an irradiation angle of 120 °. Therefore, when the thickness of the light guide plate 10 is thinner than the width of the LED 22, the light emitted by the LED 22 is not much incident on the end face 18 of the light guide plate 10. That is, sufficient light energy is not guided to the light guide plate 10, and the illuminance is insufficient.
　しかし、導光板装置１では、図１に示すように、ＬＥＤ２２で発光し、導光板１０の端面１８に入射しない光は、先ずカバー３０の反射面３２で反射される。カバー３０と光源２０の基盤２４でＬＥＤ２２と導光板１０の端面１８を覆い、密閉しているので、導光板１０の端面１８に入射しない光は、反射面３２および基盤２４で反射され、空洞３４内で散光状態となる。散光状態となった光は、導光板１０の表裏の面１４、１６から導光板１０内に導かれる。図１では、反射面３２で反射された光は、１回の反射後に導光板１０の表裏の面１４、１６から導光板１０内に導かれるように描かれているが、必ずしも１回の反射後に導光板１０内に導かれず、反射面３２と基盤２４で複数回反射された後に導光板１０内に導かれてもよい。導光板１０内に導かれた光は、導光板１０内を進み、反射ドットで反射され、発光面である面１６から発光される。 However, in the light guide plate device 1, as shown in FIG. 1, the light emitted by the LED 22 and not incident on the end face 18 of the light guide plate 10 is first reflected by the reflection surface 32 of the cover 30. Since the LED 22 and the end face 18 of the light guide plate 10 are covered and sealed with the cover 30 and the base 24 of the light source 20, light not incident on the end face 18 of the light guide plate 10 is reflected by the reflective surface 32 and the base 24. It becomes a light scattering state inside. The light in the diffused state is guided from the front and back surfaces 14 and 16 of the light guide plate 10 into the light guide plate 10. In FIG. 1, the light reflected by the reflection surface 32 is drawn so as to be guided from the front and back surfaces 14 and 16 of the light guide plate 10 into the light guide plate 10 after one reflection, but it is not always necessary The light may not be guided into the light guide plate 10 later, but may be guided into the light guide plate 10 after being reflected a plurality of times by the reflecting surface 32 and the base 24. The light guided into the light guide plate 10 travels in the light guide plate 10, is reflected by the reflection dots, and is emitted from the surface 16 which is a light emitting surface.
　すなわち、導光板装置１によれば、導光板１０の厚さがＬＥＤ２２の幅より薄くても、光エネルギのほとんどが導光板１０内に導かれて、導光板１０は、高い照度で発光する。よって、導光板１０の厚さを、汎用のＬＥＤの幅３ｍｍより薄くすることが可能になる。 That is, according to the light guide plate device 1, even if the thickness of the light guide plate 10 is thinner than the width of the LED 22, most of the light energy is guided into the light guide plate 10, and the light guide plate 10 emits light at high illuminance. Therefore, the thickness of the light guide plate 10 can be thinner than the width 3 mm of the general-purpose LED.
　図１では、長手方向断面視（図１に示す断面）で反射面３２は円弧を描くように示されているが、反射面３２の形状は限定されない。導光板１０の厚さとＬＥＤ２２の幅の関係によっては、反射面３２は複数の曲線Ｃ１、Ｃ２を有する形状としてもよい。複数の曲線Ｃ１、Ｃ２を有する形状とすることにより、反射面３２で反射された光が表裏の面１４、１６から導光板１０内に導かれ易くなる。なお、曲線Ｃ１、Ｃ２は、必ずしも円弧である必要はなく、楕円、正弦波、インボリュート曲線など公知の曲線の一部であってもよい。ここで、複数の曲線とは、上記のような公知の曲線あるいは公知の曲線に類似の曲線の一部の形状が複数含まれていることを指す。図１では、２つの曲線Ｃ１、Ｃ２を有する形状を示すが、曲線の数は限定されない。 In FIG. 1, the reflective surface 32 is illustrated as drawing an arc in a longitudinal sectional view (cross section shown in FIG. 1), but the shape of the reflective surface 32 is not limited. Depending on the relationship between the thickness of the light guide plate 10 and the width of the LED 22, the reflective surface 32 may have a shape having a plurality of curves C1 and C2. With the shape having the plurality of curves C1 and C2, light reflected by the reflection surface 32 can be easily guided from the front and back surfaces 14 and 16 into the light guide plate 10. The curves C1 and C2 do not necessarily have to be arcs, and may be part of a known curve such as an ellipse, a sine wave, or an involute curve. Here, the plurality of curves indicate that the known curve as described above or a portion of the curve similar to the known curve is included. Although FIG. 1 shows a shape having two curves C1 and C2, the number of curves is not limited.
　図３は、別の長手方向断面視の形状の反射面３２ａを有する導光板装置２および導光板組立体７を示す断面図である。図３に示す反射面３２ａでは、図１に示す反射面３２に対し、滑らかな凹凸３８が付けられている。滑らかな凹凸３８は、断面視ではなく平面として見た反射面３２ａの表面に形成される。反射面３２ａに滑らかな凹凸３８が付けられることにより、反射面３２ａで反射した光が散光状態を作り、導光板１０、ＬＥＤ２２および反射面３２の形状によっては、表裏の面１４、１６から導光板１０内に導かれ易くなる。ここで、「滑らか」とは平面と角だけで構成されていないことを意味し、平面や角が含まれていてもよい。 FIG. 3 is a cross-sectional view showing the light guide plate device 2 and the light guide plate assembly 7 having a reflecting surface 32 a having another shape in a longitudinal cross sectional view. In the reflective surface 32 a shown in FIG. 3, smooth asperities 38 are attached to the reflective surface 32 shown in FIG. 1. The smooth asperity 38 is formed on the surface of the reflecting surface 32 a viewed as a flat surface, not a cross sectional view. The smooth asperity 38 is attached to the reflecting surface 32a, so that the light reflected by the reflecting surface 32a forms a light scattering state, and depending on the shapes of the light guide plate 10, the LED 22 and the reflecting surface 32, the light guide plate from the front and back surfaces 14 and 16 It becomes easy to be led into ten. Here, "smooth" means that it is not composed only of a plane and a corner, and a plane or a corner may be included.
　次に、図１に例示した導光板装置１において、反射面３２の長手方向断面視の形状を変化させて測定した導光板１０の照度について説明する。 Next, in the light guide plate device 1 illustrated in FIG. 1, the illuminance of the light guide plate 10 measured by changing the shape of the reflection surface 32 in the longitudinal sectional view will be described.
　測定に用いた導光板１０は、サイズ３００ｍｍ×５００ｍｍの厚さ１ｍｍのアクリル板を用い、反射ドットをプリントした。その上から、東レ社製Ｅ６ＳＲ＃１８８（厚さ１８８μｍ）の白色フィルムを反射シート１２として貼付した。なお、反射ドットはアクリル板の全面にプリントし、反射シート１２はカバー３０の外側においてのみ貼付した。ＬＥＤは、日亜化学社製１２Ｖ、４．３２Ｗ、幅３ｍｍ、長さ３ｍｍ、厚さ０．５ｍｍのものを用い、３００ｍｍのアルミ製の基盤２４上に、１０ｍｍ間隔で３０個を配列した。導光板１０の端面１８とＬＥＤ２２は接触するように配置した。 The light guide plate 10 used for the measurement printed a reflective dot using a 1 mm thick acrylic plate with a size of 300 mm × 500 mm. On top of that, a white film of E6SR # 188 (thickness: 188 μm) manufactured by Toray Industries, Inc. was attached as the reflective sheet 12. The reflective dots were printed on the entire surface of the acrylic plate, and the reflective sheet 12 was attached only to the outside of the cover 30. As LEDs, 12 V, 4.32 W, 3 mm wide, 3 mm long and 0.5 mm thick manufactured by Nichia Corporation were used, and 30 LEDs were arranged at intervals of 10 mm on an aluminum base 24 of 300 mm. The end face 18 of the light guide plate 10 and the LED 22 were disposed in contact with each other.
　カバー３０は、３Ｄプリンタを用いて白色のＡＢＳ樹脂を用いて成形した。外形を７ｍｍ幅とし、長さは３００ｍｍとし、高さは原則６ｍｍとした。カバー３０は樹脂で成形したままで、鏡面仕上げは施さなかった。また、導光板１０がカバー３０を貫通する箇所は、実質的に隙間がないように作成した。測定に用いた導光板装置１では、接着剤等で固定することは行わなかった。 The cover 30 was molded using a white ABS resin using a 3D printer. The outer diameter was 7 mm, the length was 300 mm, and the height was 6 mm in principle. The cover 30 was molded with resin and was not mirror-finished. Moreover, the location where the light guide plate 10 penetrates the cover 30 was created so that there may be substantially no gap. In the light guide plate device 1 used for the measurement, fixing with an adhesive or the like was not performed.
　導光板１０の照度は、図４の模式図に示すように、導光板１０の発光面１６をデジタル照度計（Ｄｒ．Ｍｅｔｅｒ　ＤＭ－ＬＸ１３３０Ｂ）で測定した。発光面１６の２７測定点（高さ方向に５０ｍｍ間隔で９か所、長さ方向に３か所）で測定し、その平均の照度を導光板１０の照度とした。 The illuminance of the light guide plate 10 was measured with a light intensity meter (Dr. Meter DM-LX1330B) on the light emitting surface 16 of the light guide plate 10 as shown in the schematic view of FIG. The measurement was made at 27 measurement points of the light emitting surface 16 (9 places at intervals of 50 mm in the height direction and 3 places in the length direction), and the average illuminance was taken as the illuminance of the light guide plate 10.
　カバー３０の反射面３２の形状を図５ａ～５ｉに示す。図５ａ～５ｉは、図１と同様に導光板装置１の長手方向断面視である。図中「Ｒ」は、円弧である曲線の半径を表わす。 The shape of the reflective surface 32 of the cover 30 is shown in FIGS. 5a-5i. 5a to 5i are longitudinal sectional views of the light guide plate device 1 similarly to FIG. In the figure, “R” represents the radius of a curve that is an arc.
　図５ａに示す形状１では、導光板１０、ＬＥＤ２２とカバー３０の間の空洞３４をほとんどなくした。導光板１０の照度は、７００Ｌｕｘであり、一般的に実用的照度と言われている２０００Ｌｕｘよりかなり低く、実用的ではない。すなわち、導光板１０の端面１８とＬＥＤ２２とをカバー３０で覆うだけでは、所望の照度は得られない。 In the shape 1 shown in FIG. 5a, the cavity 34 between the light guide plate 10, the LED 22 and the cover 30 is almost eliminated. The illuminance of the light guide plate 10 is 700 Lux, which is much lower than 2000 Lux, which is generally called practical illuminance, and is not practical. That is, only by covering the end face 18 of the light guide plate 10 and the LED 22 with the cover 30, a desired illuminance can not be obtained.
　図５ｂに示す形状２では、反射面３２を平面とし、断面視で略正三角形の空洞３４を形成した。導光板１０の照度は、１０００Ｌｕｘであり、形状１より照度が向上した。しかし、実用的照度は得られなかった。反射面３２を平面としたまま、空洞３４の断面視での面積、すなわち体積や平面の傾斜角度を変えて測定も行ったが、照度の向上はあまり見られなかった。 In the shape 2 shown in FIG. 5 b, the reflecting surface 32 is a flat surface, and a cavity 34 having a substantially regular triangle shape is formed in a cross sectional view. The illuminance of the light guide plate 10 was 1000 Lux, and the illuminance was improved compared to the shape 1. However, practical illuminance was not obtained. Measurement was also performed while changing the area of the cavity 34 in a cross sectional view, that is, the volume and the inclination angle of the plane while keeping the reflecting surface 32 flat, but little improvement in the illuminance was observed.
　図５ｃに示す形状３では、ＬＥＤ２２の側部には空洞を形成せず、ＬＥＤ２２の上部に広い空間を形成した。空間は、断面視で、ＬＥＤ２２より幅が広く、角を丸めた矩形とした。その結果、形状２よりもさらに照度が向上し、１３００Ｌｕｘとなった。 In the shape 3 shown in FIG. 5 c, no cavity was formed on the side of the LED 22, and a large space was formed on the top of the LED 22. The space is wider than the LED 22 in a cross sectional view, and has a rectangular shape with rounded corners. As a result, the illuminance was further improved than that of the shape 2 and became 1300 Lux.
　図５ｄに示す形状４では、形状３の空間を、ＬＥＤ２２と同じ幅からなで肩で上方に狭まる形状とした。その結果、形状３よりもさらに照度が向上し、１５００Ｌｕｘとなった。 In the shape 4 shown in FIG. 5d, the space of the shape 3 has a shape that narrows upward from the same width as the LED 22 and with a shoulder. As a result, the illuminance was further improved than in the shape 3 and became 1500 Lux.
　そこで、図５ｅに示す形状５では、形状４の空間の幅、高さを広げた。すなわち、ＬＥＤ２２の側部にも空間を形成してカバー３０がＬＥＤ２２に接触しないようにした。その結果、照度は１８００Ｌｕｘに向上し、実用的レベルに近づいた。 Therefore, in the shape 5 shown in FIG. 5e, the width and height of the space of the shape 4 are expanded. That is, a space is formed on the side of the LED 22 so that the cover 30 does not contact the LED 22. As a result, the illuminance increased to 1800 Lux and approached the practical level.
　図５ｆに示す形状６では、空洞３４の幅を形状５よりもさらに広げた。その結果、照度は２０００Ｌｕｘという実用的レベルに達した。 In the shape 6 shown in FIG. 5 f, the width of the cavity 34 is wider than the shape 5. As a result, the illuminance reached a practical level of 2000 Lux.
　図５ｇに示す形状７では、反射面３２が導光板１０と接する上部の形状を滑らかにした。すなわち、断面視で２つの曲線を有する反射面の曲率を共に大きくし、２つの曲線を有することを明確にした。その結果、照度は２２００Ｌｕｘに向上した。 In the shape 7 shown in FIG. 5g, the shape of the upper portion where the reflective surface 32 contacts the light guide plate 10 is smoothed. That is, the curvatures of the reflecting surface having two curves in cross-sectional view are both increased, and it is clarified that two curves are included. As a result, the illuminance improved to 2200 Lux.
　断面視での空洞３４の面積と反射面の曲率を調節し、図５ｈに示す形状８で、２８５０Ｌｕｘの照度が得られた。 By adjusting the area of the cavity 34 and the curvature of the reflecting surface in a cross sectional view, an illumination of 2850 Lux was obtained with the shape 8 shown in FIG. 5h.
　図５ｉ示す形状９では、形状８より断面視での空洞３４の面積を大きくしたが、照度は２７００Ｌｕｘに低下した。なお、さらに空洞３４の面積を大きくすると照度は顕著に低下した。 In the shape 9 shown in FIG. 5i, although the area of the cavity 34 in a cross sectional view is made larger than the shape 8, the illuminance is reduced to 2700 Lux. When the area of the cavity 34 was further increased, the illuminance decreased significantly.
　照度の測定結果を図６にまとめて示す。 The measurement results of the illuminance are collectively shown in FIG.
　以上の測定結果より、長手方向断面視でカバー３０により光源２０と一端面１８とを覆い密閉して、反射面３２の形状を適切に形成することにより、薄い導光板を用いても実用的な照度が得られることが分かった。なお、断面視での空洞３４の面積には適正な面積があり、反射面３２の曲線の形状にも適正な形状があり、適正な面積や形状はＬＥＤ２２の大きさ等により変わるものと予想される。 From the above measurement results, it is practical to use a thin light guide plate by covering the light source 20 and the one end surface 18 with the cover 30 in a longitudinal sectional view and sealing the cover 30 appropriately to form the shape of the reflecting surface 32. It turned out that illuminance can be obtained. In addition, the area of the cavity 34 in a cross sectional view has an appropriate area, the shape of the curved line of the reflecting surface 32 also has an appropriate shape, and the appropriate area and the shape are expected to change depending on the size of the LED 22 Ru.
　本発明による導光板組立体および導光板装置は、簡単な装置により薄い導光板を用いても十分な照度が得られる。よって、素材の節約、軽量化に資することができる。さらに、例えば図７に示すように、導光板の用途を広げることを可能にする。図７（ａ）の模式図に示すように、２枚の導光板を貼り合わせて、両面発光パネルとすることができる。また図７（ｂ）の模式図に示すように、薄い導光板を曲げることにより、曲面の発光パネルとすることもできる。 The light guide plate assembly and the light guide plate device according to the present invention can obtain sufficient illuminance even with a thin light guide plate by a simple device. Therefore, it can contribute to the saving of materials and the weight reduction. Furthermore, as shown, for example, in FIG. 7, it is possible to expand the application of the light guide plate. As shown to the schematic diagram of Fig.7 (a), a light-guide plate of 2 sheets can be bonded together, and it can be set as a double-sided light emission panel. Moreover, as shown to the schematic diagram of FIG.7 (b), it can also be set as the light emission panel of a curved surface by bending a thin light-guide plate.
　次に、図８を参照して、導光板装置１、２を支えるためのフレームと一体化したフレーム付き導光板装置５０、５２について説明する。たとえば表示装置として用いるためには、導光板装置１、２を所定の場所に支える必要がある。従来の導光板装置では、導光板自体が厚く重量も大きくなるために、導光板および光源の周囲を囲むアルミニウム製のフレームで支えることが多い。しかし、本発明による導光板装置１、２では、導光板１０を薄くすることが可能であり、導光板装置１、２も軽量となる。そこで、従来の導光板装置を囲むフレームに代えて、フレームを一体に成形したカバー６０、６２を用いることが可能となる。 Next, with reference to FIG. 8, the framed light guide plate devices 50 and 52 integrated with the frame for supporting the light guide plate devices 1 and 2 will be described. For example, in order to use as a display device, it is necessary to support the light guide plate devices 1 and 2 at a predetermined place. In the conventional light guide plate device, since the light guide plate itself is thick and heavy, it is often supported by an aluminum frame surrounding the light guide plate and the light source. However, in the light guide plate devices 1 and 2 according to the present invention, the light guide plate 10 can be thinned, and the light guide plate devices 1 and 2 also become lightweight. Therefore, instead of the frame surrounding the conventional light guide plate device, it is possible to use the covers 60 and 62 formed integrally with the frame.
　図８（ａ）に示すフレーム付き導光板装置５０では、図１に示すカバー３０に比べ、横方向（導光板１０の厚さ方向）に広げ、かつ、光源２０を囲むようにしたフレーム付きカバー６０を用いる。フレーム付きカバー６０は、樹脂または金属で一体として形成される。光源２０は、フレーム付きカバー６０の端部から挿入できる。他の構造物にフレーム付きカバー６０を固定することで、フレーム付き導光板装置５０を支えることができる。 In the framed light guide plate device 50 shown in FIG. 8A, the frame attached cover is expanded in the lateral direction (the thickness direction of the light guide plate 10) and surrounds the light source 20 as compared with the cover 30 shown in FIG. Use 60. The framed cover 60 is integrally formed of resin or metal. The light source 20 can be inserted from the end of the framed cover 60. By fixing the framed cover 60 to another structure, the framed light guide plate device 50 can be supported.
　図８（ｂ）に示すフレーム付き導光板装置５２では、図８（ａ）に示すフレーム付きカバー６０を、二つの部品で構成するフレーム付きカバー６２を用いる。すなわち、導光板１０や光源２０を二つの部品で挟みこむ。フレーム付きカバー６２は、樹脂または金属で形成される。なお、フレーム付きカバー６２は、フレーム導光板装置５２を構造物に固定し易くするために、固定スライド６４を有している。固定スライド６４をチャンネル型のレールに嵌めることでフレーム付き導光板装置５２を固定することができる。なお、一体型のフレーム付きカバー６０が固定スライドを有してもよいし、二体型のフレーム付きカバー６２が固定スライド６４を有していなくてもよい。フレーム付きカバー６０、６２の外形は、特に限定されない。 In the framed light guide plate device 52 shown in FIG. 8B, the framed cover 62 shown in FIG. 8A is composed of a two-part framed cover 62. That is, the light guide plate 10 and the light source 20 are sandwiched by two parts. The framed cover 62 is formed of resin or metal. The framed cover 62 has a fixed slide 64 in order to facilitate fixing the frame light guide plate device 52 to the structure. The framed light guide plate device 52 can be fixed by fitting the fixed slide 64 to the channel type rail. The integral framed cover 60 may have a fixed slide, and the two-piece framed cover 62 may not have the fixed slide 64. The outer shape of the framed covers 60 and 62 is not particularly limited.
　フレーム付き導光板装置５０、５２では、フレームが一体に成形されているので、従来用いられていたフレームが不要となり、部品数や製造工程を少なくすることができると共に、軽量化が図れる。 In the framed light guide plate devices 50 and 52, since the frames are integrally formed, the conventionally used frame is not necessary, the number of parts and the number of manufacturing steps can be reduced, and weight reduction can be achieved.
　以下に、明細書および図面で用いた主な符号をまとめて示す。
１、２　導光板装置
６、７　導光板組立体
１０　導光板
１２　反射シート
１４　一方の面
１６　発光面
１８　導光板の一端面
２０　光源
２２　ＬＥＤ
２４　基盤
３０　カバー
３２、３２ａ　反射面
３４　空洞
３６　カバーの端面
３８　反射面の凹凸
４０　接着剤
５０、５２　フレーム付き導光板装置
６０、６２　フレーム付きカバー
６４　固定用スライド
Ｃ１、Ｃ２　曲線 The main reference numerals used in the specification and drawings are summarized below.
1, 2 light guide plate device 6, 7 light guide plate assembly 10 light guide plate 12 reflective sheet 14 one surface 16 light emitting surface 18 light guide plate one end surface 20 light source 22 LED
24 Base 30 Cover 32, 32a Reflective surface 34 Cavity 36 Cover end face 38 Reflective surface unevenness 40 Adhesive 50, 52 Frame with light guide plate device 60, 62 Frame with cover 64 Fixing slide C1, C2 Curve

Claims (13)

  1. 　光源からの光を一端面から導入し、一方の面から発光する導光板と、
    　長手方向断面視で前記光源と前記一端面とを覆うように形成され前記一端面を密閉するためのカバーであって、前記光源から発光し前記一端面に入射しない光を反射する反射面を有するカバーとを備え、
    　前記反射面で反射された光は、前記導光板の表裏の面からも入射する、
    　導光板組立体。     A light guide plate which introduces light from a light source from one end and emits light from one side;
    A cover formed to cover the light source and the one end surface in a longitudinal sectional view and sealing the one end surface, having a reflection surface that reflects light which is emitted from the light source and is not incident on the one end surface Equipped with a cover,
    The light reflected by the reflective surface is also incident from the front and back surfaces of the light guide plate.
    Light guide plate assembly.
  2. 　前記カバーの前記反射面は、長手方向断面視で曲線を有する、
    　請求項１に記載の導光板組立体。     The reflective surface of the cover has a curve in longitudinal cross section,
    The light guide plate assembly according to claim 1.
  3. 　前記反射面の長手方向断面視での曲線は複数である、
    　請求項２に記載の導光板組立体。     There are a plurality of curves in the longitudinal sectional view of the reflecting surface
    The light guide plate assembly according to claim 2.
  4. 　前記カバーの前記反射面には、滑らかな凹凸が付けられる、
    　請求項２または３に記載の導光板組立体。     The reflective surface of the cover is provided with smooth irregularities.
    A light guide plate assembly according to claim 2 or 3.
  5. 　前記カバーが不透明な樹脂で形成された、
    　請求項１ないし３のいずれか１項に記載の導光板組立体。     The cover is formed of opaque resin,
    A light guide plate assembly according to any one of claims 1 to 3.
  6. 　前記反射面が鏡面仕上げされた、
    　請求項５に記載の導光板組立体。     The reflective surface is mirror finished,
    A light guide plate assembly according to claim 5.
  7. 　前記カバーが金属で形成された、
    　請求項１ないし３のいずれか１項に記載の導光板組立体。     The cover is formed of metal,
    A light guide plate assembly according to any one of claims 1 to 3.
  8. 　請求項１ないし３のいずれか１項に記載の導光板組立体と、
    　前記光源とを備える、
    　導光板装置。     A light guide plate assembly according to any one of claims 1 to 3;
    And the light source
    Light guide plate device.
  9. 　前記光源がＬＥＤである、
    　請求項８に記載の導光板装置。     The light source is an LED,
    A light guide plate device according to claim 8.
  10. 　前記カバーが前記ＬＥＤの発光部に接触しない、
    　請求項９に記載の導光板組立体。     The cover does not contact the light emitting unit of the LED;
    The light guide plate assembly according to claim 9.
  11. 　前記カバーが前記ＬＥＤの基板とで前記導光板の一端面を密閉する、
    　請求項９または１０に記載の導光板組立体。     The cover seals one end surface of the light guide plate with the substrate of the LED.
    A light guide plate assembly according to claim 9 or 10.
  12. 　前記導光板が、前記ＬＥＤの幅より薄い、
    　請求項９または１０に記載の導光板装置。     The light guide plate is thinner than the width of the LED,
    A light guide plate device according to claim 9 or 10.
  13. 　請求項９または１０に記載の導光板装置を支えるフレームと、前記カバーとが一体に形成される、
    　フレーム付き導光板装置。     A frame supporting the light guide plate device according to claim 9 or 10, and the cover are integrally formed.
    Framed light guide plate device.
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WO2019156049A1 (en) * 2018-02-07 2019-08-15 古河電気工業株式会社 Illumination device, attachment mechanism structure for illumination device, method for extracting light from illumination device, and optical connection method for illumination device

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