WO2013132671A1 - 導光板、この導光板を用いた表示装置、この表示装置を含む道路標識、導光板の製造方法及び道路標識の製造方法 - Google Patents
導光板、この導光板を用いた表示装置、この表示装置を含む道路標識、導光板の製造方法及び道路標識の製造方法 Download PDFInfo
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- WO2013132671A1 WO2013132671A1 PCT/JP2012/068667 JP2012068667W WO2013132671A1 WO 2013132671 A1 WO2013132671 A1 WO 2013132671A1 JP 2012068667 W JP2012068667 W JP 2012068667W WO 2013132671 A1 WO2013132671 A1 WO 2013132671A1
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- diffusion
- guide plate
- light guide
- region
- diffusion region
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- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
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- 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
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/90—Methods of manufacture
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- 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
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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- 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
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
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- 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
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
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- 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
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
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- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/18—Edge-illuminated signs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- 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
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/04—Signs, boards or panels, illuminated from behind the insignia
- G09F13/0418—Constructional details
- G09F13/0472—Traffic signs
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/04—Signs, boards or panels, illuminated from behind the insignia
- G09F13/0418—Constructional details
- G09F13/049—Edge illuminated signs, boards or panels
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/18—Edge-illuminated signs
- G09F2013/184—Information to display
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
Definitions
- the present invention relates to a light guide plate, a display device using the light guide plate, a road sign including the display device, a light guide plate manufacturing method, and a road sign manufacturing method.
- a method of illuminating the main surface of a circular or polygonal (for example, pentagonal) light guide plate a method of arranging LEDs over the entire side surface of the light guide plate is known.
- C-type steel provided with a light source unit having a plurality of LEDs on the inside is arranged on the side surface side of the light guide plate, 2.
- illumination devices and display devices that irradiate light from an LED and diffuse the light with diffusion dots provided on the main surface of the light guide plate when the light enters the light guide plate.
- this method of arranging LEDs over a wide area on the side surface of the light guide plate there is a problem that the number of LEDs arranged increases and power consumption is large.
- the light guide plate is a polygon (for example, a pentagon)
- a method of arranging a light source only on the side surface side of each straight side without arranging a light source near each curved vertex is conceivable.
- LEDs are not arranged in the vicinity of each vertex, there is a problem in that the vicinity of each vertex becomes darker than other portions, uneven brightness occurs, and the brightness of the entire main surface cannot be made uniform. .
- Patent Document 1 discloses that the entire main surface is formed by diffusing light between the LED and the LED by forming a prism on the entire side surface of the light guide plate on the LED arrangement side. An illumination device using a light guide plate that makes the brightness of the light uniform is described.
- the present invention has been made in view of such problems, and even when a light source is not disposed near each curved vertex of the main surface, the difference in brightness depending on the location of the main surface can be reduced and saved.
- the main purpose is to provide a light guide plate that contributes to electric power.
- a display device that can reduce power consumption while keeping the difference in brightness depending on the location of the main surface small without arranging a light source near each apex where the main surface is curved.
- Another object is to provide a road sign including the display device.
- the present invention employs the following means in order to achieve at least one of the above-mentioned objects.
- the light guide plate of the present invention is A light guide plate that guides light incident from the side surface to the main surface,
- the main surface has a first diffusion region and a second diffusion region, and is a shape surrounded by at least three or more straight portions and curved portions connecting the adjacent straight portions, respectively.
- the first diffusion region is a region having a plurality of first diffusion parts for diffusing the light incident from the side surface to the main surface side
- the second diffusion region is a region having a plurality of second diffusion portions that are located between the first diffusion region and the curved portion and diffuse the light incident from the side surface to the main surface side,
- the ratio of the area occupied by the plurality of first diffusion portions to the first diffusion region is smaller than the ratio of the area occupied by the plurality of second diffusion portions to the second diffusion region, Is.
- the light guide plate has a second diffusion region at a position between the first diffusion region and the curved portion, and the proportion of the area of the second diffusion portion in the second diffusion region is the first diffusion region. It is larger than the ratio of the area of one diffusion part.
- the second diffusion part provided in the second diffusion region is provided to be denser than the first diffusion part provided in the first diffusion region. For this reason, when light uniformly enters from the entire side surface side, the second diffusion region becomes brighter than the first diffusion region.
- the ratio of the area of the second diffusion portion in the second diffusion region is set to the first.
- the first diffusion portion and the second diffusion portion may be diffusion dots.
- the first diffusion part and the second diffusion part can be formed by the same method, so that the first diffusion part and the second diffusion part are compared with the case where the first diffusion part and the second diffusion part are formed by different methods.
- the labor when forming the two diffusion portions can be further reduced.
- the second diffusion region is more than in the first diffusion region. The area becomes brighter.
- the first diffusion portion may be a diffusion dot
- the second diffusion portion may be a diffusion dot and a first diffusion groove.
- the area ratio between the diffusion dots provided in the second diffusion region and the first diffusion groove is larger than the area ratio of the diffusion dots provided in the first diffusion region, and is uniform from the entire side surface side.
- the second diffusion region becomes brighter than the first diffusion region.
- the first diffusion groove may be provided continuously in a dotted line shape, or the first diffusion groove may be radial from the curved portion side. A plurality may be formed.
- the area ratio of the first diffusion groove increases as it approaches the curved portion side, the vicinity of the curved portion becomes brightest when light is uniformly incident from the entire side surface side.
- the area ratio of the first diffusion portion in the vicinity of the curved portion where the most incident light is reduced is increased, so that it changes as the curved portion is approached. Brightness can be reduced. In other words, it is possible to reduce brightness unevenness on the entire main surface.
- the second diffusion region may be a region including a region surrounded by a virtual arc drawn around an intersection where extension lines of adjacent straight portions intersect each other and the curved portion. Good. By doing this, when the light source is not arranged in the curved portion, the light incident from the entire side surface side decreases as the curved portion is approached, but the area ratio of the second diffusion portion in the second diffusion region is increased. By doing so, the difference in brightness between the first diffusion region and the second diffusion region can be reduced. In other words, it is possible to reduce unevenness in brightness on the entire main surface and give an excellent aesthetic appearance.
- the second diffusion region has a third diffusion having a second diffusion groove that diffuses the light incident from the side surface to the main surface side in a part of the curved portion side of the second diffusion region. It may include a region.
- the first diffusion region or the second diffusion region in each region is divided into three stages of the first diffusion region, the second diffusion region, and the third diffusion region as approaching the curved portion side from the center of the light guide plate.
- the area ratio is increased and light is incident uniformly from the entire side surface, the brightness of the light changes in three stages. By doing so, it is possible to reduce the unevenness of the brightness of the entire main surface as compared with the case where the third diffusion region is not provided.
- the second diffusion groove may be provided continuously in a dotted line shape, or the second diffusion groove may be radially formed from the curved portion side. A plurality may be formed.
- the area ratio of the second diffusion groove increases as it approaches the curved portion side. Therefore, when light is uniformly incident from the entire side surface, the vicinity of the curved portion is brightest.
- the area ratio of the second diffusion portion in the vicinity of the curved portion where the most incident light is reduced is increased, so that it changes as the curved portion is approached. Brightness can be reduced. In other words, it is possible to reduce brightness unevenness on the entire main surface.
- the third diffusion region may be a region in which the first diffusion groove and the second diffusion groove are alternately provided.
- the brightness difference in the third diffusion region can be reduced. In other words, it is possible to reduce unevenness in brightness on the entire main surface and give an excellent aesthetic appearance.
- the third diffusion region may be similar to the second diffusion region.
- the distance from each light source to the third diffusion region and the second diffusion region becomes the same.
- the difference in brightness from the second diffusion region can be reduced. In other words, the difference in brightness over the entire main surface can be reduced.
- the main surface may be triangular, quadrangular, pentagonal or hexagonal.
- the main surface has these shapes, in the conventional light guide plate, when the light source is not arranged in the curved portion, the unevenness of the brightness on the entire main surface becomes large, so that the effect of applying the present invention is great.
- the display device of the present invention may include the light guide plate according to any one of the above and a plurality of LEDs that are positioned outside the linear portion and irradiate light to the side surface of the linear portion.
- the light guide plate is arranged so that a straight line portion that is located outside the four straight line portions of the five straight line portions that form a pentagon and that the plurality of LEDs are not provided at the outer position is on the upper side. It may be a thing.
- the amount of light emitted from the LED decreases as it approaches each vertex of the light guide plate.
- the light guide plate described in any of the above is provided, it changes as it approaches each vertex. Can reduce the brightness.
- the number of LEDs arranged can be reduced, which contributes to power saving. In other words, it is possible to provide an illuminating device that reduces the difference in brightness over the entire main surface while reducing power consumption.
- the display device of the present invention may be provided on the curved surface side of the curved portion and reflecting light guided to the curved surface side of the curved portion. In this way, the light guided to the curved surface side of the curved portion is reflected by the reflecting member, so that the vicinity of the curved portion becomes brighter, and the degree of decrease in brightness that changes as the curved portion is approached can be reduced. .
- the display device of the present invention is adjacent to a side of the main surface where the diffusion dots are provided, and is provided with a reflecting plate that reflects light emitted from the main surface and the diffusion dots of the main surface. And a milk half plate that is adjacent to the non-display side and displays predetermined information. By doing so, the information displayed on the milk half-plate is brighter than when there is no reflector, and the difference in brightness in the entire display device can be reduced.
- the road sign of the present invention includes any of the display devices described above and a display unit having display information composed of characters, symbols, drawings, or a combination thereof. Since the road sign of the present invention includes any of the display devices described above, the same effect as the display device described above, for example, display information displayed on the display unit while reducing power consumption, The effect of displaying the difference in brightness in a small state can be obtained.
- the display unit may be a film attached to the surface of the milk half plate. If it carries out like this, a display part can be provided by simple operation of sticking a film on the surface of a milk half board.
- the method for producing the light guide plate of the present invention comprises: (A) a first diffusion portion forming step for forming a plurality of first diffusion portions on the main surface; (B) a second diffusion part forming step of forming the second diffusion part in the second diffusion region; Is included.
- the light guide plate manufacturing method of the present invention includes a first diffusion part forming step for forming a plurality of first diffusion parts on the main surface, and a second diffusion part formation for forming the second diffusion part in the second diffusion region. Therefore, a light guide plate in which the difference in brightness over the entire main surface is reduced can be manufactured.
- the light guide plate manufacturing method includes: (a) by pressing a processing dot disposed on a tip surface of an ultrasonic processing horn, a plurality of the main surface having a shape reflecting the shape of the processing dot; A diffusion dot forming step for forming a diffusion dot; and (b) a diffusion groove forming step for forming the second diffusion portion in the second diffusion region using a laser processing machine after the diffusion dot processing step. It may be a thing. In this way, after forming the plurality of diffusion dots on the main surface by pressing the processing dots, the difference in brightness on the entire main surface is formed by forming the second diffusion portion in the second processing region using a laser processing machine. Can be manufactured.
- the light guide plate manufacturing method of the present invention includes (a) a first diffusion portion forming step for forming a plurality of first diffusion portions on the main surface, and (b) forming the second diffusion grooves in the third diffusion region. And a diffusion groove forming step. In this way, it is possible to manufacture a light guide plate that has a reduced difference in brightness over the entire main surface compared to a light guide plate that does not have the second diffusion groove.
- the light guide plate manufacturing method includes: (a) by pressing a processing dot disposed on a tip surface of an ultrasonic processing horn, a plurality of the main surface having a shape reflecting the shape of the processing dot; A diffusion dot forming step for forming a diffusion dot; (b) a diffusion groove formation step for forming the second diffusion groove in the third diffusion region using a laser processing machine after the diffusion dot formation step; ) After the diffusion groove forming step, a second diffusion groove forming step of forming the second diffusion groove in the third diffusion region using a laser processing machine may be included. In this way, it is possible to manufacture a light guide plate that has a reduced difference in brightness over the entire main surface compared to a light guide plate that does not have the second diffusion groove.
- a light guide plate that guides light incident from the side of the present invention to the main surface, a display film that is provided on the surface of the main surface and displays display information composed of characters, symbols, figures, or a combination thereof,
- A a diffusion dot forming step of forming a plurality of diffusion dots on the main surface in a shape reflecting the shape of the processing dots by pressing the processing dots disposed on the tip surface of the ultrasonic processing horn;
- B a diffusion groove forming step for forming the second diffusion groove in the second diffusion region using a laser processing machine after the diffusion dot processing step;
- C an assembly step of positioning the LED on the side surface of the linear portion;
- the road sign manufacturing method of the present invention is a light guide plate manufactured by a method capable of reducing the difference in brightness on the entire main surface even when light is emitted from the LED positioned on the side surface of the straight portion. Since it uses, the road sign which reduced the difference in the brightness in the whole main surface can be manufactured.
- FIG. 1 is a front view illustrating the outline of the configuration of the light guide plate 30.
- FIG. 2 is an explanatory diagram for explaining a process of forming the first diffusion dots 32 a and the second diffusion dots 32 b on the light guide plate 30.
- FIG. 3 is a perspective view schematically showing the configuration of the display device 20.
- FIG. 4 is a perspective view schematically showing the configuration of the road sign 10.
- FIG. 5 is a front view illustrating a schematic configuration of the light guide plate 130.
- FIG. 6 is a front view illustrating a schematic configuration of the light guide plate 230.
- FIG. 7 is a front view illustrating the outline of the configuration of another embodiment of the light guide plate 230.
- FIG. 8 is a front view illustrating the outline of the configuration of another embodiment of the light guide plate 230.
- FIG. 9 is a front view illustrating a schematic configuration of the light guide plate 330.
- FIG. 10 is a front view illustrating the outline of the configuration of another embodiment of the light guide plate 330.
- FIG. 11 is a front view illustrating the outline of the configuration of another embodiment of the light guide plate 330.
- FIG. 12 is a front view showing an outline of a configuration of a light guide plate for measuring brightness.
- FIG. 13 is a partially enlarged view showing the vicinity of each vertex of the light guide plate.
- FIG. 14 is an explanatory diagram showing the brightness of each part of the light guide plate.
- FIG. 15 is a front view showing an outline of a configuration of a light guide plate for measuring brightness.
- FIG. 16 is a partially enlarged view showing the vicinity of each vertex of the light guide plate.
- FIG. 17 is an explanatory diagram showing the brightness of each part of the light guide plate.
- FIG. 18 is a front view showing an example of a conventional light guide plate.
- FIG. 19 is an explanatory diagram showing an outline of the configuration of the road sign 110.
- FIG. 20 is a front view illustrating the outline of the configuration of the road sign 210.
- FIG. 21 is an explanatory diagram showing an outline of the configuration of the road sign 210.
- the light guide plate 30 of the present embodiment corresponds to the light guide plate
- the curved portion 30a corresponds to the curved portion
- the straight portion 30b corresponds to the straight portion
- the first diffusion region 31a corresponds to the first diffusion region
- the second diffusion region 31b corresponds to the second diffusion region
- the third diffusion region 31c corresponds to the third diffusion region
- the first diffusion dot 32a corresponds to the first diffusion portion
- the first diffusion dot 32a the second diffusion region
- the dots 32b and the third diffusion dots 32c correspond to the diffusion dots
- the first diffusion groove 132 corresponds to the first diffusion groove
- the white light emitting LED 54 corresponds to the LED
- the reflection seal 28 corresponds to the reflection member
- the plate 22 corresponds to a reflecting plate
- the milk half plate 24 corresponds to a milk half plate
- the display film 12 corresponds to a display unit.
- FIG. 1 is a plan view showing an outline of the configuration of the light guide plate 30 according to the first embodiment of the present invention, and shows an enlarged plan view of a portion A in the lower right portion.
- the light guide plate 30 is a plate made of methacrylic resin having a thickness of about 4 mm to about 8 mm and having a substantially pentagonal plate shape.
- the shape of the light guide plate 30 is a part of each side of a substantially pentagonal shape, which is a straight line portion 30b formed in a straight line, and the vicinity of each vertex of a substantially pentagonal shape, and adjacent straight line portions 30b.
- the shape is surrounded by a curved portion 30a connecting the two.
- a plurality of first diffusion dots 32 a are provided on the back side of the light guide plate 30, and second diffusion dots 32 b are provided in the vicinity of each vertex.
- the vicinity of each vertex of the light guide plate 30 becomes brighter than other positions when light is uniformly incident from the entire side surface side of the light guide plate 30.
- region enclosed with the dashed-dotted line in FIG. 1) of each vertex where this 1st diffusion dot 32a is provided densely is the 2nd diffusion area 31b, and other than the 2nd diffusion area 31b The region is the first diffusion region 31a.
- the back surface side of the light guide plate 30 means the main surface of the light guide plate 30 and the side having the first diffusion dots 32a and the second diffusion dots 32b. Means the main surface of the light guide plate 30 and does not have the first diffusion dots 32a and the second diffusion dots 32b.
- the first diffusion dot 32 a and the second diffusion dot 32 b are concave portions that are recessed in a substantially quadrangular pyramid shape, and are provided so that a position corresponding to the bottom surface of the quadrangular pyramid is located on the back surface of the light guide plate 30.
- the length of each side of the quadrangular pyramid is set to 0.6 mm to 1.5 mm, and the depth of the first diffusion dot 32a and the second diffusion dot 32b is set to 0.4 mm to 0.8 mm. Is provided.
- the pitch between the adjacent first diffusion dots 32a is set to a pitch of about 1.5 millimeters to about 8.0 millimeters.
- the size of the first diffusion dot 32a and the second diffusion dot 32b is larger and smaller than the actual size for the sake of drawing, and actually, the smaller first diffusion dot 32a. As a result, more second diffusion dots 32b are formed.
- the second diffusion region 31b will be described in more detail.
- the second diffusion region 31b is a region near each vertex of the light guide plate 30, and is a region in which the second diffusion dots 32b are provided in addition to the first diffusion dots 32a.
- the second diffusion dots 32b having the same shape as that of the first diffusion dots 32a are provided by being shifted by a half pitch with respect to the pitch interval of the first diffusion dots 32a.
- the radius of the second diffusion region 31b from the apex of the light guide plate 30 is preferably 20.0 millimeters to 300.0 millimeters, and more preferably 30.0 millimeters to 250.0 millimeters.
- the area density of the first diffusion dots 32a and the second diffusion dots 32b in the second diffusion region 31b is twice the area density of the first diffusion dots 32a in the first diffusion region 31a.
- the surface side of the light guide plate 30 can be made brighter than the first diffusion region 31a.
- the brightness of the second diffusion region 31b is set to the same level as the first diffusion region 31a. Can do.
- the light source unit 50 need not be provided near each vertex of the light guide plate 30.
- the range of the second diffusion region 31b can be determined as appropriate according to the angle of the curved portion 30a and the size of the light guide plate 230.
- FIG. 2 is an explanatory diagram for explaining a method of forming the first diffusion dots 32a and the second diffusion dots 32b.
- the first diffusion is performed by pressing the ultrasonic processing horn 60 to which ultrasonic vibration is applied to the resin plate. Dots 32a are formed.
- the ultrasonic processing horn 60 is connected to a known ultrasonic processing machine (not shown), and four processing dots 62 are arranged in a matrix on the front end surface in four vertical and horizontal directions.
- the machining dots 62 have a substantially quadrangular pyramid shape and are provided on the tip surface of the ultrasonic processing horn 60. For this reason, if it presses on the light-guide plate 30 in the state which applied the ultrasonic vibration to the horn 60 for ultrasonic processing, the 1st diffused dot 32a in which the shape of the process dot 62 was reflected can be formed.
- the ultrasonic processing horn 65 is positioned at a position between the diffusion dots 32a and pressed against the light guide plate 30 with ultrasonic vibration applied to the ultrasonic processing horn 65, so that the ultrasonic processing horn 65 is obtained.
- the second diffusing dots 32b reflecting the shape of the processed dots 62 arranged on the tip surface can be formed.
- the light is periodically diffused by forming the second diffusion dot 32b at the intermediate point between the first diffusion dot 32a and the first diffusion dot 32a. Therefore, it is excellent in aesthetics.
- more diffusion dots are arranged by the amount of the second diffusion dots 32b than in the first diffusion region 31a, it looks brighter than the case where the second diffusion dots 32b are not provided.
- FIG. 3 is an exploded perspective view showing an outline of the configuration of the display device 20.
- the display device 20 includes the light guide plate 30 described above, the reflection plate 22 disposed on the back surface side of the light guide plate 30, the milk half plate 24 disposed on the front surface side of the light guide plate 30, and the vicinity of each vertex of the light guide plate 30. And a light source unit 50 disposed at a position facing the straight line portion 30b that is a part of each side of the light guide plate 30. These are fixed from the side by a frame (not shown).
- the display device 20 when light is irradiated from the light source unit 50 to the side surface of the light guide plate 30, the light is mainly guided to the surface side by the light guide plate 30.
- the light guided in the direction of the curved portion 30 a is reflected by the reflective seal 28 provided on the side surface side of the curved portion 30 a and is guided again by the light guide plate 30.
- the power consumption can be reduced by reducing the number of the light source units 50 while reducing the labor for arranging the light source units 50 by not arranging the light source units 50 in the vicinity of each vertex.
- the reflection plate 22 is an opaque white plastic plate material having substantially the same shape as the light guide plate 30, and reflects light guided to the back side of the light guide plate 30 to the surface side of the light guide plate 30. For this reason, compared with the case where the reflecting plate 22 is not provided, the surface side of the light guide plate 30 can be made brighter.
- the milk half plate 24 is a milk semi-colored translucent resin plate having substantially the same shape as the light guide plate 30, and scatters and transmits light diffused by the first diffusion dots 32a and the second diffusion dots 32b. . By doing so, the possibility of visually recognizing the shapes of the first diffusion dots 32a and the second diffusion dots 32b is reduced, and by making the entire surface side bright, there may be uneven brightness on the surface of the light guide plate 30. Can be reduced in advance.
- the reflective seal 28 is an opaque white plastic film or sheet member having substantially the same width as the thickness of the light guide plate 30, and reflects light guided to the side surface of the light guide plate 30 toward the center of the light guide plate 30. To do. For this reason, the vicinity of each vertex of the light guide plate 30 provided with the reflective seal 28 becomes brighter than the case where the reflective seal 28 is not provided by the light reflected by the reflective seal 28.
- the light source unit 50 includes a substrate 52 and a plurality of surface-mounted white light emitting LEDs 54 (hereinafter referred to as “LEDs 54”) mounted on the substrate 52 at predetermined intervals. Irradiate light to the side.
- the light source unit 50 is provided at a position facing the straight line portion 30 b which is a part of each side of the light guide plate 30. For this reason, when it is provided on the curved portion 30a, it is necessary to perform curved processing into the same shape as that of the curved portion 30a. Further, the light source unit 50 may be waterproofed or drip-proofed.
- an epoxy resin or the like may be potted on the substrate 52, completely sealed coating may be performed, or the light source unit 50 may be enclosed in a silicon tube or the like. By doing so, there is a possibility that the light source unit 50 may break down or malfunction even if condensation occurs inside the display device 20 or raindrops enter the display device 20. Can be reduced.
- the arrangement position of the light source unit 50 may be only outside the first diffusion region 31a, or may be outside each of the first diffusion region 31a and the second diffusion region 31b.
- the milk half plate 24 overlaps with the front surface side of the light guide plate 30, the reflection plate 22 overlaps with the back surface side of the light guide plate 30, and the reflective seal 28 is disposed on the curved portion 30 b of the light guide plate 30.
- the light source unit 50 is disposed at a position facing the straight line portion 30a and is fixed by a frame (not shown).
- FIG. 4 is a perspective view showing an outline of the configuration of the road sign 10.
- the road sign 10 includes a display device 20 shown in FIG. 3 and a support column 14 disposed on the back side of the display device 20.
- predetermined display information for example, A display film 12 having a letter “stop” is attached.
- the road sign 10 when light is irradiated from the light source unit 50 provided in the display device 20 to the side surface of the light guide plate 30, the light is mainly guided to the surface side by the light guide plate 30, and the display film 12 is displayed. Information is displayed.
- the light guided in the direction of the curved portion 30 a is reflected by the reflective seal 28 provided on the side surface side of the curved portion 30 a and is guided again by the light guide plate 30. Will be.
- the support column 14 is an iron columnar member, one end side is fixed to the back surface side of the display device 20, and the other end side is fixed to a desired location to fix the road sign 10 at a desired position. Install.
- the road sign 10 is disposed at a desired position by the support pillar 14 provided with the display film 12 on the surface side of the display device 20 and fixed at one end side.
- the installation form of the support pillar 14 is not limited to this, For example, you may install in the upper wall surface etc. of the entrance / exit of a tunnel.
- FIG. 5 is a front view illustrating the outline of the configuration of the light guide plate 130.
- the same number is attached
- the light guide plate 130 is different in that a third diffusion region 31c is provided.
- the light guide plate 130 has a third diffusion region 31 c (region surrounded by a two-dot chain line in FIG. 5) at a position closer to each vertex in the second diffusion region 31 b. Yes.
- the third diffusion region 31c is provided with a third diffusion dot 32c in addition to the plurality of first diffusion dots 32a and second diffusion dots 32b provided in the second diffusion region 31b.
- the third diffusion region 31c has a radius of 30.0 millimeters to 200.0 millimeters from each vertex of the light guide plate 30, and more preferably 50.0 millimeters to 150.0 millimeters.
- the third diffusion dot 32c is provided at an intermediate point between the first diffusion dot 32a or the second diffusion dot 32b adjacent to the first diffusion dot 32a or the second diffusion dot 32b provided in the second diffusion region 31b. Therefore, the area density of the diffusion dots in the third diffusion region 31c is twice the area density of the first diffusion dots 32a and the second diffusion dots 32b in the second diffusion region 31b, compared with the first diffusion region 31a. The area density is 4 times. For this reason, when the same amount of light is incident from the entire side surface side, the surface side of the light guide plate 30 can be made brighter than the first diffusion region 31a and the second diffusion region 31b.
- the area density of the diffusing dots changes in two steps as the distance from the light source unit 50 increases. Even if the light guide plate 130 is not provided near each vertex, unevenness in the overall brightness of the light guide plate 130 can be reduced.
- the range of the third diffusion region 31c can be determined as appropriate according to the angle of the curved portion 30a and the size of the light guide plate 130.
- the third diffusion dot 32c provided on the light guide plate 130 has the same size as the second diffusion dot 32b, but may be smaller than the second diffusion dot 32b. Also in this case, the same effect as the above-described embodiment can be obtained. Similarly, the second diffusing dot 32b may be smaller than the first diffusing dot 32a. In this case, the same effect as that of the above-described embodiment can be obtained.
- the display device 20 or the road sign 10 is configured using the light guide plate 130 instead of the light guide plate 30 provided in the display device 20 and the road sign 10, the display device 20 or the road sign 10 is not guided.
- the same effect as that of the light plate 130 for example, the entire main surface of the light guide plate 130 can be brightened to the same extent.
- the configuration and the manufacturing method of the display device 20 and the road sign 10 are the same except that the light guide plate 30 is changed to the light guide plate 130, description thereof is omitted.
- FIG. 6 is a front view illustrating the outline of the configuration of the light guide plate 230.
- the same number is attached
- the light guide plate 230 is different in that the second diffusion dots 32b are not provided in the second diffusion region 31b and a plurality of first diffusion grooves 132 are provided.
- the light guide plate 230 is provided with a plurality of first diffusion grooves 132 in the second diffusion region 31 b. Since the first diffusion grooves 132 are provided radially from the curved portion 30a toward the center of the light guide plate 230, the first diffusion grooves 132 are closely spaced in the vicinity of the curved portion 30a. The distance between the first diffusion grooves 132 becomes sparse as the distance from the distance increases. In this way, when light is evenly irradiated from the side surface side of the light guide plate 230, the area density of the region that diffuses the combined light of the first diffusion dots 32a and the first diffusion grooves 132 is the curved portion 30a. Therefore, the main surface appears brighter as it approaches the curved portion 30a.
- the area density of the first diffusion dots 32a and the first diffusion grooves 132 increases as the distance from the light source unit 50 increases. Even if the light source unit 50 is not provided in the vicinity of each vertex of the light guide plate 30, unevenness in the overall brightness of the light guide plate 130 can be reduced.
- the first diffusion groove 132 is a groove provided on the surface of the light guide plate 230.
- the width of the first diffusion groove 132 is preferably 0.2 mm to 1.0 mm, and more preferably 0.4 mm to 0.6 mm.
- the length of the first diffusion groove 132 from the curved portion 30a toward the center of the light guide plate 230 is, for example, preferably 20.0 millimeters to 300.0 millimeters, and more preferably 30.0 millimeters to 250.0 millimeters. .
- the width and length of the first diffusion groove 132 can be determined as appropriate according to the angle of the curved portion 30a and the size of the light guide plate 230.
- the first diffusion grooves 132 are provided radially from the curved portion 30a toward the center of the light guide plate 230.
- a plurality of first diffusion grooves 132 may be provided substantially in parallel with any one of the straight portions 30b adjacent to the curved portion 30a. In this way, for example, when the light source unit 50 is provided only in one of the linear portions 30b adjacent to the curved portion 30a, the first is approximately parallel to the linear portion 30b in which the light source unit 50 is provided.
- the diffusion groove 132 By providing the diffusion groove 132, the light emitted from the light source unit 50 can be sufficiently diffused to the main surface.
- the first diffusion grooves 132 are provided radially from the curved portion 30a toward the center of the light guide plate 230.
- FIG. 7 (C) a plurality of linear portions 30b adjacent to the curved portion 30a may be provided substantially in parallel to form a lattice shape. Each may be provided in parallel in a direction away from the portion 30a.
- the light source unit 50 is provided in the straight portion 30b adjacent to any one of them.
- the light emitted from the light source unit 50 can be sufficiently diffused to the main surface, and unevenness in the overall brightness of the light guide plate 130 can be reduced.
- the first diffusion groove 132 is a linear groove, but as shown in FIG. 8A, the first diffusion groove 132 is a dotted line provided at equal intervals. Alternatively, as shown in FIG. 8B, a dotted line having a short interval between long grooves may be used. In either case, the same effects as those of the third embodiment described above can be obtained.
- the direction of the dotted line may be any of the directions described above. In either case, the same effects as those of the third embodiment described above can be obtained.
- FIG. 9 is a plan view illustrating the outline of the configuration of the light guide plate 330. Note that portions similar to those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the light guide plate 330 is different in that a third diffusion region 31c is provided.
- the light guide plate 330 has a third diffusion region 31 c at a position closer to each vertex in the first diffusion region 31 a.
- the third diffusion region 31c further includes a second diffusion groove 134 in addition to the second diffusion region 31b.
- the second diffusion groove 134 provided in the third diffusion region 31 c is radially formed from the curved portion 30 a toward the center of the light guide plate 330 at a position between the first diffusion groove 132 and the first diffusion groove 132. Each is provided.
- the first diffusion groove 132 and the second diffusion groove 134 hereinafter referred to as “diffusion” provided in the third diffusion region 31c.
- the area density of the groove 136 is also larger than that of the second diffusion region 31b, so that the main surface appears brighter as it approaches the curved portion 30a.
- the area density of the diffusion grooves 136 increases as the distance from the light source unit 50 increases. Even if the light guide plate 130 is not provided near each vertex, unevenness in the overall brightness of the light guide plate 130 can be reduced.
- the second diffusion groove 134 is provided between the first diffusion groove 132 and the first diffusion groove 132.
- the second diffusion groove 134 is provided between the first diffusion groove 132 and the first diffusion groove 132 that are respectively provided radially from the light guide plate 230 toward the center.
- a plurality of first diffusion grooves 132 and second diffusion grooves 134 may be provided alternately in parallel with any one of the straight portions 30b adjacent to the curved portion 30a. In this way, for example, when the light source unit 50 is provided only in one of the linear portions 30b adjacent to the curved portion 30a, the first is approximately parallel to the linear portion 30b in which the light source unit 50 is provided.
- the second diffusion groove 134 is provided between the first diffusion groove 132 and the first diffusion groove 132.
- a second diffusion groove 134 may be provided at a position orthogonal to the groove 132, and the first diffusion groove 132 and the second diffusion groove 134 may form a lattice shape, or as shown in FIG.
- the first diffusion groove 132 may be provided in a lattice shape
- the second diffusion groove 134 may be provided in a lattice shape so as to be smaller than the lattice formed by the first diffusion groove 132.
- FIG. As shown, the first diffusion groove 132 and the second diffusion groove 134 may be provided in parallel in the direction away from the curved portion 30a.
- the light source unit 50 is provided in the straight portion 30b adjacent to any one of them.
- the light emitted from the light source unit 50 can be sufficiently diffused to the main surface.
- the second diffusion groove is provided between the first diffusion groove 132 and the first diffusion groove 132 that are provided radially from the curved portion 30a toward the center of the light guide plate 230, respectively.
- the second diffusion is performed so as to be orthogonal to the first diffusion groove 132 provided substantially parallel to any of the straight portions 30b adjacent to the curved portion 30a.
- a groove 134 may be provided.
- the first diffusion groove 132 and the second diffusion groove 134 are linear grooves. However, as shown in FIG. 11A, dotted lines provided at equal intervals. Or a dotted line having a short interval between the long grooves as shown in FIG. 11 (B), or the first diffusion groove as shown in FIG. 11 (C). 132 and the second diffusion groove 134 may have different groove lengths. In any case, the same effect as the above-described fourth embodiment can be obtained.
- FIG. 19 is a front view, a side view, and an AA cross-sectional view showing an outline of the configuration of the road sign 110.
- the same number is attached
- the road sign 110 is provided with a display board 112 on the front side, and two fixing devices 111 for supporting the road sign 110 by being fixed to a post (not shown) on the back side. It has been. At this time, a through hole (not shown) is provided below the road sign 110. By doing so, even if condensation occurs inside the road sign 110 or raindrops enter the road sign 110, the water inside can be discharged.
- the road sign 110 has an L-shaped side frame 116 fixed to the front side of the main body frame 114 with bolts 113 a, and the display board 112 is interposed between the main body frame 114 and the side frame 116. It is pinched. At this time, the waterproof washer 113b is sandwiched between the main body frame 114 and the bolt 113a, and the buffer member 117 is sandwiched between the display panel 112 and the side frame 116, so that the waterproof property is excellent.
- a road sign 110 can be installed outdoors. Further, a back plate 118 is fixed to the back side of the main body frame 114 by bolts 115 a, and the light guide plate 30 is fixed to the back plate 118 by a fixing member 120. At this time, since the waterproof washer 115b is sandwiched between the back plate 118 and the bolt 115a, the waterproof property is excellent.
- the fixing member 120 has a top surface 120a and a bottom surface 120b that are parallel to each other, and the top surface 120a and the bottom surface 120b are connected by an inclined surface 120c.
- the light guide plate 30 is fixed to the upper surface 120a of the fixing member 120, and the back plate 118 is fixed to the lower surface 120b. By doing so, the light guide plate 30 can be fixed without contacting the main body frame 114, the side frame 116, and the back plate 118. For example, if dew condensation occurs inside the road sign 110 or raindrops enter the road sign 110, the water drops will accumulate below the road sign 110.
- the light guide plate 30 and the light source unit 50 are positioned away from the lower surface of the road sign 110.
- the possibility that the light source unit 50 or the light guide plate 30 may fail or malfunction due to water accumulated in the water can be reduced in advance.
- a light source unit 50 is provided on the side of the light guide plate 30 in a linear portion of each side.
- the light source unit 50 is supported by a U-shaped light source fixing member 122.
- the light guide plate 30 is fixed to the side surface side. In this way, light is irradiated from the light source unit 50 to the side surface of the light guide plate 30, and is diffused by the light guide plate 30 toward the main surface of the light guide plate 30.
- FIG. 20 is a front view of the road sign 210
- FIG. 21 is a side view, a BB cross-sectional view, and a CC cross-sectional view showing the outline of the configuration of the road sign 210.
- the light guide plate 210 is provided with a display plate 212 on the front side, and on the back side is provided with two fixtures 211 that support the road sign 210 by being fixed to a post or the like (not shown). ing.
- a through hole (not shown) is provided below the road sign 110.
- the light guide plate 230 included in the road sign 210 is obtained by making the shape of the light guide plate 30 in the first embodiment into a disk shape, description thereof is omitted here.
- the road sign 210 has an L-shaped side frame 216 fixed to the front side of the main body frame 214 with bolts 213 a, and a display board 212 is provided between the main body frame 214 and the side frame 216. It is pinched. At this time, the waterproof washer 213b is sandwiched between the main body frame 214 and the bolt 213a, and the buffer member 217 is sandwiched between the display panel 212 and the side frame 216, so that the waterproof property is excellent.
- the road sign 210 can be placed outdoors. Further, a back plate 218 is fixed to the back side of the main body frame 214 by bolts 215 a, and the light guide plate 230 is fixed to the back plate 218 by a fixing member 220.
- the waterproof washer 215b is sandwiched between the back plate 218 and the bolt 215a, the waterproof property is excellent. Also, if condensation occurs inside the road sign 210 or raindrops enter the road sign 210, the water drops will accumulate below the road sign 210. In addition to being discharged from a through hole (not shown) provided below the sign 210, the light guide plate 230 and the light source unit 250 are positioned away from the lower surface of the road sign 110. The possibility that the light source unit 250 or the light guide plate 230 may malfunction or malfunction due to water accumulated in the water can be reduced. In addition, since the shape of the fixing member 220 is the same as that of the fixing member 210, description is abbreviate
- a light source unit 250 is provided on the side surface side of the light guide plate 230, and the light source unit 250 is fixed to the side surface side of the light guide plate 230 by a U-shaped light source fixing member 222. By doing so, light is irradiated from the light source unit 250 to the side surface of the light guide plate 230 and is diffused by the light guide plate 230 toward the main surface of the light guide plate 230. Since the configuration of the light source unit 250 is the same as that of the light source unit 50, the description thereof is omitted here.
- the first diffusion dot 32a occupying the area ratio of the first diffusion dot 32a and the second diffusion dot 32b in the second diffusion region 31b in the first diffusion region 31a. Therefore, even if the light source unit 50 is not provided in the curved portion 30a, a difference in brightness (brightness unevenness) on the entire main surface can be reduced.
- the second diffusion region 31b includes the first diffusion groove 132 in addition to the second diffusion dot 32b, Even when the light source unit 50 is not provided in the curved portion 30a, the difference in brightness (brightness unevenness) on the entire main surface can be reduced.
- first diffusion grooves 132 are dotted lines provided at equal intervals, and a plurality of the first diffusion grooves 132 are formed radially from the curved portion 30a toward the center, so that the area density of the dotted lines approaches the curved portion 30a. As it grows. By doing so, even when the light source unit 50 is not provided in the curved portion 30a, the difference in brightness (brightness unevenness) on the entire main surface can be reduced.
- the second diffusion region 31b has the third diffusion region 31c in a part on the curved portion 30a side, the first diffusion region 31a and the second diffusion region 31b are directed from the center side toward the curved portion 30a.
- the total area density of the diffusion dots 32 and the diffusion grooves 136 is gradually increased from the center side toward the curved portion 30a, and thus the third diffusion region 31c is not provided. Compared with, it is possible to reduce the difference in brightness (brightness unevenness) on the entire main surface.
- the second diffusion grooves 134 are on the dotted lines provided at equal intervals and are formed in a radial pattern from the curved portion 30a toward the center, so the area density of the dotted lines is the curved portion 30a. It gets bigger as you get closer. By doing so, even when the light source unit 50 is not provided in the curved portion 30a, the difference in brightness (brightness unevenness) on the entire main surface can be reduced.
- the second diffusion groove 134 is provided between the first diffusion groove 132 and the first diffusion groove 132, and in the second diffusion region 31b, the first diffusion groove 132 and the second diffusion groove 134 are formed. Since they are alternately arranged, it is possible to reduce the unevenness of brightness in the second diffusion region 31b and to reduce the difference in brightness (brightness unevenness) on the entire main surface.
- the third diffusion region 31c is similar to the second diffusion region 31b, the distance from the light source unit 50 provided in the linear portion 30b to the second diffusion region 31b or the first diffusion region 31a is the same.
- the difference in brightness (brightness unevenness) between the third diffusion region 31c and the second diffusion region 31b can be reduced.
- the difference in brightness (brightness unevenness) on the entire main surface can be reduced.
- the light guide plate 30 is substantially pentagonal, there are five curved portions 30a where the linear light source unit 50 cannot be arranged, so the light guide plate 30 is applied as compared to the case where the light guide plate is circular. Great effect.
- a light guide plate may be formed by arbitrarily combining the first to fourth embodiments described above, or a lighting device or a road sign may be formed using a light guide plate of these combinations. Good. In either case, the same effect as the above-described embodiment can be obtained.
- the first diffusion dot 32a and the second diffusion dot 32b are the same, but may be different sizes.
- each side of the diffusing dots 32 may be gradually lengthened or the depth may be gradually increased. By doing so, the amount of light diffused by the diffusing dots 32 increases as the distance from the light source unit 50 increases, so that the difference in brightness (brightness unevenness) in the entire light guide plate can be further reduced.
- the light guide plate 30 is a methacrylic resin plate having transparency.
- the light guide plate 30 is not limited to methacrylic resin as long as the material has transparency, and methyl methacrylate or ethyl
- methacrylic resins such as methacrylate
- various materials such as acrylic resins such as methyl acrylate and ethyl acrylate, ABS resins, polycarbonate, and polyethylene can be used. In any case, the same effect as the above-described embodiment can be obtained.
- the light guide plate 30 is a transparent methacrylic resin plate, but the first diffusion region 31a, the second diffusion region 31b, and the third diffusion region 31c are made of different materials. Good.
- a predetermined amount of a diffusing agent may be kneaded into the light guide plate 30, or a plurality of materials having different diffusivities may be combined.
- a different amount of diffusing agent from the first diffusion region 31a may be kneaded into the second diffusion region 31b or the third diffusion region 31c, or the first diffusion region may be incorporated into the second diffusion region 31b or the third diffusion region 31c.
- a material having a higher diffusivity than 31a may be used. By doing so, the same effect as the above-described embodiment can be obtained.
- the diffusion dots 32 are formed using the ultrasonic processing horn 60, and the first diffusion grooves 132 and the second diffusion grooves 134 are processed using a laser processing machine.
- the processing method of the 1st diffusion groove 132 and the 2nd diffusion groove 134 may use the desired method selected suitably.
- all of the diffusion dots 32, the first diffusion grooves 132, and the second diffusion grooves 134 may be processed using a laser processing machine, or the grooves may be cut using a plotter.
- the diffusing dots 32, the first diffusing grooves 132, and the second diffusing grooves 134 are processed into concave shapes, but may be processed into convex shapes by screen printing, silk printing, etc. You may process by injection molding using the engraved metal mold. In any case, the same effect as the above-described embodiment can be obtained.
- the first diffusion region 31a and the second diffusion region 31b or the third diffusion region 31c are made of different materials, and the diffusion dots 32, the first diffusion groove 132, and the second diffusion groove 134 are each formed by a desired processing method. May be used for processing. For example, while diffusing a different amount of diffusing agent from the first diffusion region 31a into the second diffusion region 31b or the third diffusion region 31c, all of the diffusion dots 32, the first diffusion groove 132, and the second diffusion groove 134 are laser-treated. You may process using a processing machine or cut a groove using a plotter. The same effects as those of the above-described embodiment can be obtained regardless of which of the above-described materials and processing methods are selected and combined.
- FIG. 12 is a front view showing the light guide plate on which the brightness measurement result has been obtained.
- the light guide plate used in this measurement is the same as the light guide plate 330 shown in FIG. 9 except for the shape of the diffusion groove provided in the vicinity of each apex, and thus the description thereof is omitted.
- Diffusion dots are provided on the entire surface of the light guide plate, and diffusion grooves are respectively formed in the A portion, the B portion, and the C portion near each vertex.
- dots having a length of 1 mm and a width of 0.5 mm are radially formed at intervals of 10 ° with the intersection ⁇ on the extension line of the adjacent straight line parts as the center.
- the first diffusion groove formed at 70.0 millimeters centering on the intersection ⁇ at intervals of 0 millimeters, and four dots having a length of 1.0 millimeter and a width of 0.5 millimeters are formed between the first diffusion groove and the second diffusion groove.
- dots having a length of 2.0 millimeters and a width of 0.5 millimeters are radially formed at intervals of 20 ° around the intersection ⁇ on the extension line of the adjacent straight part.
- First diffusion grooves formed at 30.0 millimeters around the intersection ⁇ at intervals of 2.0 millimeters are provided.
- dots having a length of 1.5 millimeters and a width of 0.5 millimeters are radially formed at intervals of 10 ° centering on the intersection ⁇ on the extension line of the adjacent straight part.
- the first diffusion groove formed at 98.0 millimeters centering on the intersection ⁇ at intervals of 3.5 millimeters, and two dots having a length of 4 millimeters and a width of 0.5 millimeters are formed between the first diffusion groove and the second diffusion groove.
- the arrangement position of the light source will be described with reference to FIG.
- the light source a plurality of surface-emitting white LEDs were used, and the light sources were arranged at positions schematically shown by using rectangles in FIG.
- the light sources were arranged on the left and right side portions of the light guide plate, and were not arranged on the side surfaces of the upper side of the light guide plate in FIG. In this state, the LED was turned on, and the brightness of each part of the light guide plate was measured.
- Example 1 Measurement was performed under the same conditions as in Example 1, except that the first diffusion groove and the second diffusion groove were not formed in the A part, the B part, and the C part, using the same light guide plate as in Example 1.
- FIG. 14 shows a comparison result of the illuminance of each part of the light guide plate in Example 1 and Comparative Example 1.
- FIG. 14 is a comparative diagram showing a comparison result of illuminance between Example 1 and Comparative Example 1
- FIG. 14A shows the result of Example 1
- FIG. 14B shows the result of Comparative Example 1.
- the unit of the value in the figure is lux.
- Example 1 around 1200 lux in the vicinity of the central portion of the light guide plate, around 1300 to 1400 lux in the vicinity of each apex, and even though no LED is arranged in the curved portion, each The result was bright near the top.
- FIG. 15 is a front view showing a light guide plate on which the brightness measurement result is obtained, showing another example of the brightness measurement result indicating unevenness of brightness on the surface of the light guide plate.
- the light guide plate used in this measurement has a substantially triangular shape, and diffusion dots are provided on the entire surface of the light guide plate. Diffusion grooves are respectively formed in the A portion and the B portion near each vertex.
- dots of 1 mm in length and 0.5 mm in length radially at an interval of 10 ° are centered on the A portion, as shown in FIG.
- a first diffusion groove formed at 115.0 millimeters centering on the intersection ⁇ at intervals of 0 millimeters, and a dot having a length of 2 millimeters and a width of 0.5 millimeters between the first diffusion groove and the second diffusion groove is 4.0.
- dots of 1 mm in length and 0.5 mm in length are radially formed at an interval of 10 ° in the B part, centering on the intersection ⁇ on the extension line of adjacent straight line parts.
- the first diffusion groove formed at 93.0 millimeters centering on the intersection ⁇ at intervals of 0 millimeters, and four dots having a length of 2.0 millimeters and a width of 0.5 millimeters are formed between the first diffusion groove and the second diffusion groove.
- the arrangement position of the light source will be described with reference to FIG.
- the light source a plurality of surface-emitting white LEDs were used, and the light sources were arranged at positions schematically shown using rectangles in FIG.
- the light source was disposed on the side surface portion of each side of the light guide plate, and was not disposed at a position near each vertex of the light guide plate. In this state, the LED was turned on, and the brightness of each part of the light guide plate was measured.
- Example 2 Measurement was performed under the same conditions as in Example 1 except that the first diffusion groove and the second diffusion groove were not formed in the A part and the B part, using the same light guide plate as in Example 2.
- FIG. 17 shows a comparison result of the illuminance of each part of the light guide plate in Example 2 and Comparative Example 2.
- FIG. 17 is a comparative diagram showing a comparison result of illuminance between Example 2 and Comparative Example 2.
- FIG. 17A shows the result of Example 2, and FIG. Each result is shown.
- the unit of the value in the figure is lux.
- the present invention can be used as an illumination field, in particular, a light guide plate for illumination and a lighting device using this light guide plate.
- Fixing tool 112, 212 ... Display board 113a, 115a, 213a, 215a ... bolt, 113b, 115b, 213b, 215b ... waterproof washer, 114, 214 ... main body frame, 116, 216 ... side frame, 117 217 ... cushioning member, 118, 218 ... back plate, 120 ... fixing member, 120a ... upper surface, 120b ... bottom surface, 122 ... light source fixing member, 132 ... first diffusion groove, 134 ... second diffusion groove, 136 ... spreading grooves.
Abstract
Description
側面から入射した光を主面に導光する導光板であって、
前記主面は、第一拡散領域と第二拡散領域とを有し、少なくとも3以上の直線部と、隣り合う前記直線部同士をそれぞれ連結する曲線部とによって囲まれた形状であり、
前記第一拡散領域は、側面から入射した前記光を主面側に拡散する複数の第一拡散部を有する領域であり、
前記第二拡散領域は、前記第一拡散領域と前記曲線部との間に位置し、側面から入射した前記光を主面側に拡散する複数の第二拡散部を有する領域であり、
前記第一拡散領域に対する複数の前記第一拡散部が占める面積の割合が、前記第二拡散領域に対する複数の前記第二拡散部が占める面積の割合よりも小さい、
ものである。
(a)前記主面に複数の第一拡散部を形成する第一拡散部形成ステップと、
(b)前記第二拡散領域に前記第二拡散部を形成する第二拡散部形成ステップと、
を含むものである。
(a)超音波加工用ホーンの先端面に配置された加工ドットを押圧することで、前記加工ドットの形状を反映した形状で前記主面に複数の前記拡散ドットを形成する拡散ドット形成ステップと、
(b)前記拡散ドット加工ステップの後に、レーザー加工機を用いて前記第二拡散領域に前記第二拡散溝を形成する拡散溝形成ステップと、
(c)前記直線部の側面にLEDを位置決めする組み立てステップと、
を含むことにより、表示フィルム全体の明るさの相違を減少させた道路標識を製造することを特徴とするものである。
曲線部30aに光源ユニット50を設けない場合であっても、主面全体における明るさの違い(明るさのムラ)を減少させることができる。
次に、導光板の表面に明るさのムラを示す明るさ測定結果の一例を示す。図12は、明るさ測定結果を行った導光板を示す正面図である。この測定で用いた導光板は、各頂点付近に設けられた拡散溝の形状以外は図9に示した導光板330と同様であるため、説明を省略する。この導光板の表面全体に拡散ドットが設けられており、各頂点付近であるA部、B部及びC部には、それぞれ拡散溝が形成されている。
A部、B部及びC部に第一拡散溝及び第二拡散溝を形成しなかったこと以外は、実施例1と同様の導光板を用い、実施例1と同様の条件で測定した。
導光板の表面に明るさのムラを示す明るさ測定結果の一他の例を示す、図15は、明るさ測定結果を行った導光板を示す正面図である。この測定で用いた導光板は、略三角形であり、導光板の表面全体に拡散ドットが設けられており、各頂点付近であるA部及びB部には、それぞれ拡散溝が形成されている。
A部及びB部に第一拡散溝及び第二拡散溝を形成しなかったこと以外は、実施例2と同様の導光板を用い、実施例1と同様の条件で測定した。
Claims (35)
- 側面から入射した光を主面に導光する導光板であって、
前記主面は、第一拡散領域と第二拡散領域とを有し、少なくとも3以上の直線部と、隣り合う前記直線部同士をそれぞれ連結する曲線部とによって囲まれた形状であり、
前記第一拡散領域は、側面から入射した前記光を主面側に拡散する複数の第一拡散部を有する領域であり、
前記第二拡散領域は、前記第一拡散領域と前記曲線部との間に位置し、側面から入射した前記光を主面側に拡散する複数の第二拡散部を有する領域であり、
前記第一拡散領域に対する複数の前記第一拡散部が占める面積の割合が、前記第二拡散領域に対する複数の前記第二拡散部が占める面積の割合よりも小さいことを特徴とする、
導光板。 - 前記第一拡散部及び前記第二拡散部は、拡散ドットである、
請求項1に記載の導光板。 - 前記第一拡散部は、拡散ドットであり、
前記第二拡散部は、拡散ドットと第一拡散溝である、
請求項1に記載の導光板。 - 前記第一拡散溝は、点線状に連続して設けられる、
請求項3に記載の導光板。 - 前記第一拡散溝は、前記曲線部側から放射線状に複数形成されている、
請求項3に記載の導光板。 - 前記第二拡散領域は、隣り合う前記直線部の延長線が互いに交わる交点を中心として描いた仮想円弧と前記曲線部とによって囲まれた領域を含む領域である、
請求項3に記載の導光板。 - 請求項1~6のいずれか1項に記載の導光板において、
前記第二拡散領域は、前記第二拡散領域の曲線部側の一部に、側面から入射した前記光を主面側に拡散する第二拡散溝を有する第三拡散領域を含む、
導光板。 - 前記第二拡散溝は、点線状に連続して設けられる、
請求項7に記載の導光板。 - 前記第二拡散溝は、前記曲線部側から放射線状に複数形成されている、
請求項7に記載の導光板。 - 前記第二拡散領域は、前記第一拡散溝と前記第二拡散溝とが交互に設けられた領域である、
請求項7に記載の導光板。 - 前記第三拡散領域は、前記第二拡散領域と相似形である、
請求項7に記載の導光板。 - 前記主面は、三角形、四角形、五角形又は六角形である、
請求項7に記載の導光板。 - 側面から入射した光を主面に導光する導光板と、前記導光板側面に光を照射する複数のLEDと、を有する表示装置であって、
前記主面は、第一拡散領域と第二拡散領域とを有し、少なくとも3以上の直線部と、隣り合う前記直線部同士をそれぞれ連結する曲線部とによって囲まれた形状であり、
前記第一拡散領域は、側面から入射した前記光を主面側に拡散する複数の第一拡散部を有する領域であり、
前記第二拡散領域は、前記第一拡散領域と前記曲線部との間に位置し、側面から入射した前記光を主面側に拡散する複数の第二拡散部を有する領域であり、
前記第一拡散領域に対する複数の前記第一拡散部が占める面積の割合が、前記第二拡散領域に対する複数の前記第二拡散部が占める面積の割合よりも小さく、
前記LEDは、前記直線部の外側の位置に複数設けられていることを特徴とする、
表示装置。 - 請求項13に記載の表示装置において、
前記第二拡散領域は、前記第二拡散領域の曲線部側の一部に、側面から入射した前記光を主面側に拡散する第二拡散溝を有する第三拡散領域を含む、
表示装置。 - 前記導光板の前記主面は、五角形であり、
複数の前記LEDは、五角形を形成する5つの前記直線部のうちの4つの直線部の外側に位置し、
複数の前記LEDが外側の位置に設けられていない直線部が上方側となるように前記導光板が配置される、
請求項14に記載の表示装置。 - 請求項15に記載の表示装置において、
前記曲線部の曲面側に位置し、前記曲線部の曲面側に導光された光を反射する反射部材と、
を備えた、
表示装置。 - 請求項16に記載の表示装置において、
前記主面の前記拡散ドットが設けられている側に隣接し、前記主面から照射された光を反射する反射板と、
前記主面の前記拡散ドットが設けられていない側に隣接し、所定の情報を表示する乳半板と、
を備えた、
表示装置。 - 側面から入射した光を主面に導光する導光板と、前記主面の表面に設けられ、文字、記号、図形又はこれらの組み合わせからなる表示情報を表示する表示フィルムと、前記導光板の外側に位置し、前記導光板の側面に光を照射するLEDとを備えた道路標識において、
前記主面は、第一拡散領域と第二拡散領域とを有し、少なくとも3以上の直線部と、隣り合う前記直線部同士をそれぞれ連結する曲線部とによって囲まれた形状であり、
前記第一拡散領域は、側面から入射した前記光を主面側に拡散する複数の第一拡散部を有する領域であり、
前記第二拡散領域は、前記第一拡散領域と前記曲線部との間に位置し、側面から入射した前記光を主面側に拡散する複数の第二拡散部を有する領域であり、
前記第一拡散領域に対する複数の前記第一拡散部が占める面積の割合が、前記第二拡散領域に対する複数の前記第二拡散部が占める面積の割合よりも小さくすることにより、表示フィルム全体の明るさの相違を減少させることを特徴とする、
道路標識。 - 前記第一拡散部及び前記第二拡散部は、四角錐又は円錐形状の凹部である拡散ドットである、
請求項18に記載の道路標識。 - 前記第一拡散部は、四角錐又は円錐形状の凹部である拡散ドットであり、
前記第二拡散部は、四角錐又は円錐形状の凹部である拡散ドットと溝状部である第一拡散溝である、
請求項18に記載の道路標識。 - 前記第一拡散溝は、点線状に連続して設けられる、
請求項20に記載の道路標識。 - 前記第一拡散溝は、前記曲線部側から放射線状に複数形成されている、
請求項20に記載の道路標識。 - 前記第二拡散領域は、隣り合う前記直線部の延長線が互いに交わる交点を中心として描いた仮想円弧と前記曲線部とによって囲まれた領域を含む領域である、
請求項20に記載の道路標識。 - 請求項18~23のいずれか1項に記載の導光板において、
前記第二拡散領域は、前記第二拡散領域の曲線部側の一部に、側面から入射した前記光を主面側に拡散する第二拡散溝を有する第三拡散領域を含む、
道路標識。 - 前記第二拡散溝は、点線状に連続して設けられる、
請求項24に記載の道路標識。 - 前記第二拡散溝は、前記曲線部側から放射線状に複数形成されている、
請求項24に記載の道路標識。 - 前記第二拡散領域は、前記第一拡散溝と前記第二拡散溝とが交互に設けられた領域である、
請求項24に記載の道路標識。 - 前記第三拡散領域は、前記第二拡散領域と相似形である、
請求項24に記載の道路標識。 - 前記主面は、三角形、四角形、五角形又は六角形である、
請求項24に記載の道路標識。 - 前記導光板の前記主面は、五角形であり、
複数の前記LEDは、五角形を形成する5つの前記直線部のうちの4つの直線部の外側に位置し、
複数の前記LEDが外側の位置に設けられていない直線部が上方側となるように前記導光板が配置される、
請求項24に記載の道路標識。 - 請求項30に記載の道路標識において、
前記曲線部の曲面側に位置し、前記曲線部の曲面側に導光された光を反射する反射部材と、
を備えた、
道路標識。 - 請求項31に記載の道路標識において、
前記主面の前記拡散ドットが設けられている側に隣接し、前記主面から照射された光を反射する反射板と、
前記主面の前記拡散ドットが設けられていない側に隣接し、前記表示フィルムが表面に貼着された乳半板と、
を備えた、
道路標識。 - 請求項1~6のいずれか1項に記載の導光板を製造する導光板の製造方法であって、
(a)前記主面に複数の第一拡散部を形成する第一拡散部形成ステップと、
(b)前記第二拡散領域に前記第二拡散部を形成する第二拡散部形成ステップと、
を含むことにより、全体の明るさの相違を減少させた導光板を製造することを特徴とする、
導光板の製造方法。 - 請求項1~6のいずれか1項に記載の導光板を製造する導光板の製造方法であって、
(a)超音波加工用ホーンの先端面に配置された加工ドットを押圧することで、前記加工ドットの形状を反映した形状で前記主面に複数の前記拡散ドットを形成する拡散ドット形成ステップと、
(b)前記拡散ドット加工ステップの後に、レーザー加工機を用いて前記第二拡散領域に前記第二拡散部を形成する拡散溝形成ステップと、
を含むことにより、全体の明るさの相違を減少させた導光板を製造することを特徴とする、
導光板の製造方法。 - 側面から入射した光を主面に導光する導光板と、前記主面の表面に設けられ、文字、記号、図形又はこれらの組み合わせからなる表示情報を表示する表示フィルムと、前記導光板の外側に位置し、前記導光板の側面に光を照射するLEDとを備えた請求項18~23のいずれか1項に記載の道路標識を製造する道路標識の製造方法において、
(a)超音波加工用ホーンの先端面に配置された加工ドットを押圧することで、前記加工ドットの形状を反映した形状で前記主面に複数の前記拡散ドットを形成する拡散ドット形成ステップと、
(b)前記拡散ドット加工ステップの後に、レーザー加工機を用いて前記第二拡散領域に前記第二拡散溝を形成する拡散溝形成ステップと、
(c)前記直線部の側面にLEDを位置決めする組み立てステップと、
を含むことにより、表示フィルム全体の明るさの相違を減少させた道路標識を製造することを特徴とする、
道路標識の製造方法。
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- 2012-07-24 MY MYPI2013003405A patent/MY166628A/en unknown
- 2012-07-24 US US13/979,206 patent/US9244210B2/en not_active Expired - Fee Related
- 2012-07-24 KR KR1020137013241A patent/KR101521733B1/ko active IP Right Grant
- 2012-07-24 JP JP2013522032A patent/JP5433816B1/ja not_active Expired - Fee Related
- 2012-10-19 CN CN2012205360442U patent/CN202995071U/zh not_active Expired - Fee Related
- 2012-10-19 CN CN201210398838.1A patent/CN103293589B/zh not_active Expired - Fee Related
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2013
- 2013-12-09 JP JP2013254558A patent/JP5775561B2/ja not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
KR101521733B1 (ko) | 2015-05-19 |
JPWO2013132671A1 (ja) | 2015-07-30 |
JP2014111887A (ja) | 2014-06-19 |
KR20130131347A (ko) | 2013-12-03 |
US20140369068A1 (en) | 2014-12-18 |
MY166628A (en) | 2018-07-17 |
CN202995071U (zh) | 2013-06-12 |
US9244210B2 (en) | 2016-01-26 |
JP5775561B2 (ja) | 2015-09-09 |
SG193229A1 (en) | 2013-10-30 |
CN103293589A (zh) | 2013-09-11 |
JP5433816B1 (ja) | 2014-03-05 |
CN103293589B (zh) | 2018-03-23 |
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