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WO2014129299A1 - Plaque de guidage de lumière - Google Patents

Plaque de guidage de lumière Download PDF

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Publication number
WO2014129299A1
WO2014129299A1 PCT/JP2014/052430 JP2014052430W WO2014129299A1 WO 2014129299 A1 WO2014129299 A1 WO 2014129299A1 JP 2014052430 W JP2014052430 W JP 2014052430W WO 2014129299 A1 WO2014129299 A1 WO 2014129299A1
Authority
WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
end side
light
glass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2014/052430
Other languages
English (en)
Japanese (ja)
Inventor
孝英 藤居
尚利 稲山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Electric Glass Co Ltd
Original Assignee
Nippon Electric Glass Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Electric Glass Co Ltd filed Critical Nippon Electric Glass Co Ltd
Priority to JP2014505433A priority Critical patent/JP6315279B2/ja
Publication of WO2014129299A1 publication Critical patent/WO2014129299A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces

Definitions

  • the present invention relates to a light guide plate made of a glass plate that emits light emitted from a light source from an end portion facing the light source and emits light.
  • a thin liquid crystal display is used as one of display devices of thin information devices, and an edge light type backlight mechanism is often adopted as the backlight mechanism.
  • this mechanism includes a light guide plate made of a transparent resin plate that emits light emitted from a light source from an end portion facing the light source and emits light, as disclosed in Patent Document 1. ing.
  • the light guide plate made of a resin plate is formed by, for example, injection molding, and a plate whose thickness is reduced to about 0.5 mm can be manufactured.
  • a light guide plate made of a glass plate that can be made thinner may be employed in the backlight mechanism.
  • a light guide plate made of a glass plate has an advantage of superior heat resistance compared to a light guide plate made of a resin plate. Accordingly, even when the amount of light collected (incident) on the light guide plate is increased, the light guide plate is prevented from being deformed or modified (for example, a decrease in transmittance) due to the heat of light. It is possible.
  • the light guide plate made of this glass plate still has problems to be solved. That is, when the light guide plate (glass plate) is thinned (for example, 10 to 200 ⁇ m), the thickness of the end side portion thereof is also reduced, so that the light emitted from the light source is preferably collected on the light guide plate. This makes it difficult to reduce the incident efficiency of the light guide plate.
  • the present invention made in view of the above circumstances has a technical problem of improving the incident efficiency to the light guide plate in the light guide plate made of a thin glass plate.
  • the present invention devised to solve the above problems is a light guide plate made of a glass plate that emits light emitted from a light source from an end portion facing the light source and emits light, and the end portion However, it is characterized by having a bulging portion having a large thickness in the plate thickness direction as compared with a portion connected to the end side portion.
  • the plate thickness of the portion connected to the end side portion may be 300 ⁇ m or less.
  • the incidence efficiency can be improved even when the portion of the light guide plate that is continuous with the edge portion is as thin as 300 ⁇ m or less.
  • the thickness of the bulging portion in the thickness direction is twice or more the thickness of the portion connected to the end portion.
  • the bulging portion is periodically formed along the end side portion.
  • the light collected on the light guide plate can be suitably diffused, and the occurrence of defects such as uneven brightness in surface emission can be suppressed.
  • the value of the average length Rsm of the roughness curve element at the edge is 10 ⁇ m or more and 2 mm or less.
  • the light emitted from the light source and taken by the light guide plate can be more suitably diffused.
  • the front surface side and the back surface side of the glass plate are formed such that tapered portions that gradually decrease in thickness in the plate thickness direction are formed from the bulging portion toward a portion that continues to the end side portion.
  • a material having substantially the same refractive index as that of glass is laid.
  • substantially the same refractive index as glass means that the refractive index of the laid material is within a range of ⁇ 10% based on the refractive index of the glass.
  • the light which daylighted will unjustly go out of a light guide plate from the level
  • the occurrence of such a situation is suppressed, and the incident efficiency can be further improved. That is, since the tapered portion is formed, the thickness of the light guide plate is gradually reduced from the bulging portion toward the portion connected to the end side portion, and does not change rapidly. For this reason, it becomes easy to avoid that the incident angle becomes small when the collected light is incident on the front surface or the back surface of the tapered portion inside the light guide plate.
  • the taper part is formed by laying the material which has the refractive index substantially the same as glass on the surface side and back surface side of a glass plate, the above-mentioned effect
  • the material having substantially the same refractive index as the glass is a resin.
  • the end portion facing the light source has the bulging portion, a sufficient thickness for collecting light is secured at the end portion, so that the thickness is reduced.
  • the incident efficiency to the light guide plate can be improved.
  • FIG. 1 is a longitudinal front view showing a light guide plate according to an embodiment of the present invention.
  • the light guide plate made of this glass plate G has a rectangular shape, and in the same figure, an end side portion Z (one side of the rectangle) extending in a direction perpendicular to the paper surface, with respect to a portion Gb continuous to the end side portion Z, It has a bulging portion Ga having a thickness of twice or more in the plate thickness direction.
  • the bulging portion Ga is periodically formed along the end side portion Z, and the value of the average length Rsm of the roughness curve element in the end side portion Z is 10 ⁇ m or more and 2 mm or less. ing.
  • the front surface S side and the rear surface B of the glass plate G are formed so that the taper portion T whose thickness in the plate thickness direction gradually decreases from the bulging portion Ga toward the portion Gb continuous with the end side portion Z.
  • a material P having substantially the same refractive index as that of glass in this embodiment, silicon resin is used
  • the thickness of the part Gb connected to the end side part Z is preferably 300 ⁇ m or less, more preferably 200 ⁇ m or less, Most preferably, it is 100 ⁇ m or less.
  • the refractive index substantially the same as that of glass means that the refractive index of the laid material P is within a range of ⁇ 10% based on the refractive index of the glass.
  • the material P acrylic resin, polystyrene, or the like can be used in addition to silicon resin.
  • the end side portion Z has a bulging portion Ga that is twice or more thicker than the portion Gb connected to the end side portion Z, so that the light guide plate (glass Even in the case where the plate G) is thinned, the edge Z is sufficient for collecting the light R emitted from a light source (not shown) installed facing the edge Z. Thickness can be ensured, and the incident efficiency to the light guide plate can be improved.
  • the bulging portion Ga is periodically formed along the end side portion Z, and the value of the average length Rsm of the roughness curve element in the end side portion Z is 10 ⁇ m or more and 2 mm or less.
  • the light R collected on the light guide plate can be suitably diffused, and occurrence of defects such as uneven brightness in surface light emission can be suppressed.
  • the front surface S side and the back surface of the glass plate G are formed so that a tapered portion T in which the thickness in the thickness direction gradually decreases from the bulging portion Ga toward the portion Gb continuous to the end side portion Z. Since the material P (silicon resin) having substantially the same refractive index as that of glass is laid on the B side, the following effects can be obtained.
  • the collected light R is unreasonably guided from the stepped portion formed by the difference between the thickness of the end side portion Z having the bulging portion Ga and the thickness of the portion Gb connected to the end side portion Z. Occurrence of a situation such as emission to the outside is suppressed, and the incident efficiency can be further improved.
  • the thickness of the light guide plate gradually decreases from the bulging portion Ga toward the portion Gb connected to the end side portion Z, and does not change rapidly.
  • the taper part T is formed by laying the material P (silicon resin) which has the refractive index substantially the same as glass on the surface S side and the back surface B side of the glass plate G, the above-mentioned The effect can be further enhanced.
  • the material P having substantially the same refractive index as that of glass is a silicon resin and is excellent in workability, the work of forming the tapered portion T can be simplified.
  • the light guide plate according to the above embodiment is manufactured by the following method.
  • board thickness of the glass plate used as a light-guide plate is all 100 micrometers.
  • FIG. 2 is a front view showing a first method of manufacturing the light guide plate according to the above embodiment.
  • a laser beam L oscillated from a laser irradiator (not shown) is incident from the surface S side of the glass plate G, and the laser beam L1 is obtained by the lens 1 and the lens 2, respectively.
  • the laser beam L2 is condensed on the surface S.
  • the glass plate G is melted
  • an edge Z for collecting the light emitted from the light source is formed on the glass plate G serving as the light guide plate.
  • the laser irradiator and the lenses 1 and 2 are fixed at fixed positions, and the optical axes X of the laser beams L1 and L2 are installed so as to be orthogonal to the front surface S and the rear surface B of the glass plate G. Further, the glass plate G is horizontally placed on a processing table (not shown). Then, when the processing table moves in a direction perpendicular to the paper surface in the drawing, the laser beams L1 and L2 are sequentially collected on the glass plate G, and the fusing progresses. Further, the two lenses 1 and 2 constitute a double lens.
  • the lens 1 has a rotationally symmetric shape about the optical axis X in the plane direction orthogonal to the optical axis X.
  • the lens 1 has an upper surface (surface on which the laser beam L is incident) and a lower surface (upper surface). The surface on the opposite side) is formed flat.
  • the upper surface has the curved portion 1a and the lower surface is formed flat.
  • the focal point C1 is located at the center of the thickness of the glass plate G.
  • the lens 2 has a rotationally symmetric shape about the optical axis X in the plane direction orthogonal to the optical axis X.
  • the upper surface surface on which the laser beam L is incident
  • the lower surface surface opposite to the upper surface
  • the focal point C2 is located apart from the irradiation side of the laser beam L2 (the back surface B side of the glass plate G) with respect to the glass plate G.
  • the separation distance from the central portion to the focal point C2 in the thickness of the glass plate G is preferably about 0.2 to 2.0 mm.
  • the radius of the central portion of the lens 1 (the distance from the optical axis X to the two-dot chain line in FIG. 2) and the radius of the central portion of the lens 2 are substantially the same.
  • the energy density distribution on the glass plate G of the laser beam obtained by superimposing the laser beam L1 collected by the lens 1 and the laser beam L2 collected by the lens 2 is In the width direction perpendicular to the direction of fusing (the direction perpendicular to the paper surface in the figure), it is located in the center and located on the side, with a high energy density part E1 capable of fusing the glass plate G, and The glass plate G is in a state including a portion E2 having a low energy density that cannot be blown.
  • the maximum value of the energy density in the region E1 having a high energy density is preferably 10,000 W / cm 2 or more, and the maximum value of the energy density in the region E2 having a low energy density is 10 to 10,000 W / cm 2. It is preferable that it is a grade.
  • the output and pulse width of the laser beam L are preferably 10 W or more and 10 ⁇ s or more.
  • the maximum values of the energy density of E1 and E2 and the ratio thereof are (1) the distance between the lens 1 and the lens 2, (2) the focal point of the curved part 1a in the lens 1 and the curved part 2a in the lens 2. The distance can be changed by adjusting the area ratio.
  • both the high energy density portion E1 and the low energy density portion E2 allows the glass plate G to be smoothly blown by the high energy density portion E1, and the low energy density portion E2 described later.
  • produce occurs.
  • a bulging portion Ga is formed in the end side portion Z formed on the glass plate G by laser cutting as shown in FIG.
  • This bulging portion Ga is formed due to the surface tension of the molten glass generated by the irradiation of the laser beam, and is twice or more as thick as the portion Gb connected to the end side portion Z (in this manufacturing method) Is formed to 200 ⁇ m or more. Further, as shown in FIG.
  • the bulging portion Ga is periodically formed along the end side portion Z, and the roughness curve of the end side portion Z is formed by the periodically formed bulging portion Ga.
  • the element is placed under a state where the average length Rsm of the element is 10 ⁇ m or more and 2 mm or less.
  • a constricted portion Gc having a smaller thickness than the bulging portion Ga is formed between adjacent bulging portions Ga. That is, the end side portion Z is formed such that the bulging portions Ga and the constricted portions Gc are alternately arranged.
  • the taper portion T of the glass plate G is formed so that the taper portion T gradually decreases in the thickness direction from the bulging portion Ga toward the portion Gb connected to the end side portion Z.
  • a material P silicon resin in this manufacturing method
  • the light guide plate made of the glass plate G is manufactured.
  • FIG. 7 is a front view showing a second manufacturing method of the light guide plate according to the embodiment of the present invention. Also by this second manufacturing method, it is possible to manufacture a light guide plate similar to the first manufacturing method described above.
  • the second manufacturing method components already described in the first manufacturing method are denoted by the same reference numerals in the drawings for describing the second manufacturing method. , Overlapping explanation is omitted.
  • the second manufacturing method is different from the first manufacturing method described above in that the optical axis X of the laser L3 irradiated to the glass plate G serving as the light guide plate is the glass.
  • the laser L3 is focused on the glass plate G by a single convex lens 3 instead of the double lens, and is applied to the front surface S and the rear surface B of the glass plate G.
  • irradiation is performed with the optical axis X inclined by an angle ⁇ .
  • the focal point C3 is located on the surface S of the glass plate G.
  • the magnitude of the angle ⁇ is preferably 30 to 80 °.
  • the assist gas A is injected from the assist gas injector 4 installed on the back surface B side of the glass plate G.
  • the assist gas injector 4 is installed in an inclined state with respect to the front surface S and the rear surface B of the glass plate G by an angle ⁇ .
  • the magnitude of the angle ⁇ is preferably 0 to 60 °.
  • the energy density distribution of the laser beam L3 collected by the lens 3 is centered in the width direction orthogonal to the fusing direction (direction perpendicular to the paper surface in the figure).
  • the high energy density part E1 capable of fusing the glass plate G and on the side of the irradiation destination side of the laser beam L3 (on the injection source side of the assist gas A), and fusing the glass plate G It will be in the state containing the site
  • the maximum value of the energy density in the region E1 having a high energy density, the maximum value of the energy density in the region E2 having a low energy density, the output of the laser beam L, and a preferable value as the pulse width are the above-described first manufacturing method. It is the same.
  • the energy density and its distribution in the second manufacturing method can be adjusted by the degree of defocusing of the laser beam L3 and the magnitude of the inclination angle ⁇ of the optical axis X.
  • the edge part Z which has the bulging part Ga is formed in the glass plate G used as a light-guide plate similarly to the 1st manufacturing method mentioned above. Moreover, when the bulging portion Ga is formed from the molten glass melted by the heat of the laser beam L3 due to the injection of the assist gas A, the bulging portion Ga hangs down due to gravity, Occurrence of a situation in which the glass plate G is eccentric from the center in the thickness direction is prevented.
  • the edge Z having the bulging portion Ga can be formed, and a glass plate G serving as a light guide plate is formed. It is possible to manufacture.
  • These parameters are such that when the balance between the amount of molten glass produced by irradiating a laser beam and the amount of molten glass that cools and hardens is in a favorable state, the bulging portion Ga is formed at the edge Z. It becomes easy.
  • the amount of molten glass depends on the spot diameter and output of the laser, and the amount (time) at which the molten glass cools and solidifies depends on the pulse width and energy density distribution of the laser.
  • the light guide plate according to the present invention is not limited to the configuration described in the above embodiment.
  • the end side portion having the bulging portion is formed only at one place (along one side) of the light guide plate that is a glass plate, but is also formed at other places (other sides).
  • the two sides are formed by laser fusing with the end sides as the ends.
  • a bulging portion may be formed along the side portion.
  • all of the four sides of the rectangular light guide plate may be formed by laser fusing as end sides to form the bulging portion.
  • the end side portion is formed in a straight line shape, but is not limited thereto, and may be formed in a curved shape.
  • the glass plate was mounted in the vertical attitude
  • a similar light guide plate can also be manufactured as an aspect of performing laser fusing in a state. In this way, the occurrence of a situation in which the bulging portion formed at the end side portion hangs down due to gravity and is eccentric from the central portion in the thickness direction of the glass plate is more preferably prevented.
  • Examples 1 to 4 a CO 2 laser having a wavelength of 10.6 ⁇ m was used, and a glass plate (OA-10G manufactured by Nippon Electric Glass Co., Ltd., thickness 100 ⁇ m) was used in the same manner as in the first or second manufacturing method described above. By carrying out laser fusing, a rectangular light guide plate having a bulging part at the end side part was manufactured.
  • the light guide plate in Comparative Example 1 is a glass plate (OA-10G manufactured by Nippon Electric Glass Co., Ltd., thickness 100 ⁇ m) in which the bulge is not formed.
  • Other manufacturing conditions are as shown in the following table.
  • a reflective tape was attached to the front and back surfaces of the light guide plate to prevent the light collected on the light guide plate from being emitted from the front and back surfaces. Then, a light source is installed at a position facing the end side portion of the light guide plate (in the embodiment, the end side portion where the bulging portion is formed), and is incident (lighted) into the light guide plate from the end side portion. The quality of the incident efficiency was determined based on the amount of light emitted from the opposite end facing the end side.
  • double lens in the item of lens means that the light guide plate is manufactured by the first manufacturing method described above, and “single lens” means that the light guide plate is manufactured by the second manufacturing method. Means that it was manufactured.
  • the inclination angle of the optical axis with respect to the front and back surfaces of the glass plate was 60 °.
  • the eccentricity of the bulging portion means that the bulging portion formed at the end side portion is formed at a position shifted downward from the central portion in the thickness direction of the light guide plate.
  • existing in the taper portion processing item means that a tapered portion whose thickness in the thickness direction is gradually reduced from the bulging portion toward the portion connected to the edge portion.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne une plaque de guidage de lumière constituée d'une plaque de verre (G) qui émet depuis sa surface une lumière émise en sortie par une source lumineuse, par éclairage depuis une partie bord extrémité (Z) en vis-à-vis avec la source lumineuse. Cette plaque de guidage de lumière est configurée de sorte que la partie bord extrémité (Z) possède une partie renflement (Ga) plus épaisse dans la direction épaisseur de la plaque qu'une région (Gb) dans la continuité de la partie bord extrémité (Z).
PCT/JP2014/052430 2013-02-22 2014-02-03 Plaque de guidage de lumière Ceased WO2014129299A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2014505433A JP6315279B2 (ja) 2013-02-22 2014-02-03 導光板

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-033073 2013-02-22
JP2013033073 2013-02-22

Publications (1)

Publication Number Publication Date
WO2014129299A1 true WO2014129299A1 (fr) 2014-08-28

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PCT/JP2014/052430 Ceased WO2014129299A1 (fr) 2013-02-22 2014-02-03 Plaque de guidage de lumière

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JP (1) JP6315279B2 (fr)
TW (1) TW201441684A (fr)
WO (1) WO2014129299A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI588512B (zh) * 2015-09-11 2017-06-21 Chenfeng Optronics Corp Production method of glass light guide plate with high transmission efficiency

Citations (10)

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Publication number Priority date Publication date Assignee Title
JPH10247413A (ja) * 1997-03-03 1998-09-14 Omron Corp 面光源装置
JPH11174438A (ja) * 1997-12-08 1999-07-02 Sanyo Electric Co Ltd 導光板、その導光板を用いた面光源及び液晶表示装置
JP2003272428A (ja) * 2002-03-19 2003-09-26 Matsushita Electric Ind Co Ltd 導光板、面照明装置、及び表示装置
JP2004523010A (ja) * 2001-07-20 2004-07-29 テレダイン・ライティング・アンド・ディスプレイ・プロダクツ・インコーポレーテッド 蛍光光源
JP2006093104A (ja) * 2004-08-25 2006-04-06 Seiko Instruments Inc 照明装置およびそれを用いた表示装置
JP2008066097A (ja) * 2006-09-07 2008-03-21 Epson Imaging Devices Corp 電気光学装置、照明装置、及び電子機器
JP2009199866A (ja) * 2008-02-21 2009-09-03 Hitachi Displays Ltd 液晶表示装置
JP2009245669A (ja) * 2008-03-29 2009-10-22 Furukawa Electric Co Ltd:The 導光部材及びその製造方法
JP2010050064A (ja) * 2008-08-25 2010-03-04 Citizen Electronics Co Ltd 導光板、面状ライトユニット及び表示装置並びに導光板の製造方法
JP2013127854A (ja) * 2011-12-16 2013-06-27 Panasonic Corp 照明器具

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Publication number Priority date Publication date Assignee Title
JP2001013321A (ja) * 1999-06-09 2001-01-19 Three M Innovative Properties Co 光学積層体、照明装置および面発光装置
KR101236089B1 (ko) * 2008-12-16 2013-02-21 오므론 가부시키가이샤 면광원 장치
JP5308963B2 (ja) * 2009-08-28 2013-10-09 株式会社ジャパンディスプレイ 液晶表示装置
TWI457620B (zh) * 2011-08-17 2014-10-21 Au Optronics Corp 導光板及背光模組

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10247413A (ja) * 1997-03-03 1998-09-14 Omron Corp 面光源装置
JPH11174438A (ja) * 1997-12-08 1999-07-02 Sanyo Electric Co Ltd 導光板、その導光板を用いた面光源及び液晶表示装置
JP2004523010A (ja) * 2001-07-20 2004-07-29 テレダイン・ライティング・アンド・ディスプレイ・プロダクツ・インコーポレーテッド 蛍光光源
JP2003272428A (ja) * 2002-03-19 2003-09-26 Matsushita Electric Ind Co Ltd 導光板、面照明装置、及び表示装置
JP2006093104A (ja) * 2004-08-25 2006-04-06 Seiko Instruments Inc 照明装置およびそれを用いた表示装置
JP2008066097A (ja) * 2006-09-07 2008-03-21 Epson Imaging Devices Corp 電気光学装置、照明装置、及び電子機器
JP2009199866A (ja) * 2008-02-21 2009-09-03 Hitachi Displays Ltd 液晶表示装置
JP2009245669A (ja) * 2008-03-29 2009-10-22 Furukawa Electric Co Ltd:The 導光部材及びその製造方法
JP2010050064A (ja) * 2008-08-25 2010-03-04 Citizen Electronics Co Ltd 導光板、面状ライトユニット及び表示装置並びに導光板の製造方法
JP2013127854A (ja) * 2011-12-16 2013-06-27 Panasonic Corp 照明器具

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JP6315279B2 (ja) 2018-04-25
TW201441684A (zh) 2014-11-01
JPWO2014129299A1 (ja) 2017-02-02

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