AU2004214519A1 - Method for producing light transmitting plate - Google Patents
Method for producing light transmitting plate Download PDFInfo
- Publication number
- AU2004214519A1 AU2004214519A1 AU2004214519A AU2004214519A AU2004214519A1 AU 2004214519 A1 AU2004214519 A1 AU 2004214519A1 AU 2004214519 A AU2004214519 A AU 2004214519A AU 2004214519 A AU2004214519 A AU 2004214519A AU 2004214519 A1 AU2004214519 A1 AU 2004214519A1
- Authority
- AU
- Australia
- Prior art keywords
- plate
- protective film
- light transmitting
- transparent resin
- transmitting plate
- 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.)
- Abandoned
Links
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
- G02B6/0065—Manufacturing aspects; Material aspects
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Elements Other Than Lenses (AREA)
- Diaphragms For Cameras (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Laser Beam Processing (AREA)
Description
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION NAME OF APPLICANT(S):: Sumitomo Chemical Company, Limited ADDRESS FOR SERVICE: DAVIES COLLISON CAVE Patent Attorneys 1 Nicholson Street, Melbourne, 3000, Australia INVENTION TITLE: Method for producing light transmitting plate The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5102 BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a method for producing a light transmitting plate, and more particularly relates to a method for producing a light transmitting plate by cutting a transparent resin plate into a plate with a prescribed size together with a protective film attached to the transparent resin plate.
Description of the Related Art As shown in Fig. 2, a light transmitting plate is assembled in a flat display device such as a liquid crystal display device to be used as an optical component for illuminating an image display unit such as a liquid crystal cell, by means of a light source such as a fluorescent lamp. The light transmitting plate is disposed, for example, at the backside of the image display unit as backlight. Next to the side of the light transmitting plate thelightsource suchasafluorescentlampisdisposed.
Incident light which enters a side face (la) of the light transmitting plate from the light source is reflected inside the light transmitting plate, is scattered and is uniformly emitted as exit light (Lo) from the surface (ib), thereby uniformly illuminating the image display unit In the flat display device shown in Fig. 2, at the front side of the image display unit a protective cover is disposed for protecting the unit The light transmitting plate light source image display unit and protective cover are contained in a casing The protective cover may be composed of impact resistant andrelativelytransparentresinfilmcontaining, forexample, rubber particles or the like. The casing may be made from opaque material containing a inorganic filler such as talc, which has high strength. On the other hand, the light transmitting plate is preferably made from a material containing no rubber particles, inorganic filler and the like from the viewpoint of low light scattering. The light transmitting plate is required to be as colorless as possible, without containing coloring matter, so as not to color the display image.
Such a light transmitting plate is usually made of transparent resin such as methacrylic resin. The light transmitting plate can be produced by cutting the plate made of the transparent resin as a material plate into smaller plate with aprescribed size. For cutting, so far, rotary circular saw blade rotating at high speed or infrared ray laser light has been used widely.
If the surface (ib) of the light transmitting plate (1) has any slightest flaw, it causes an unnecessary scattering of exit light and therefore, its raw material, that is, transparent resin plate is preferably stored and transported in a state being covered with, for example, protective films for protecting the surface of the plate from scratching, as shown in Fig. 3. Also, the transparent resin plate is preferably cut together with the protective films The protective film is preferably prepared from a transparent film so as to detect easily any foreign matter contained in the transparent resin plate as a raw material or light transmitting plate after cutting. In addition, for the ease of distinguishing the face and back of the light transmitting plate a colored transparent film and a colorless transparent film may be placed respectively on each side of the resin plate as a raw material. Alternatively, transparent films colored differently from each other are placed respectively on each side of the plate. After cutting, the light transmitting plate may be inspected before the protective film is removed off.
The light transmitting plate is inspected, for example, by checking for presence or absence of foreign matter by looking into the inside of the light transmitting plate fromthe surface Besides, byprojectingwhite light from the side the inspection can be conducted by checking for presence or absence of coloring of the light emitting from the opposite side In the conventional method using rotary circular saw blade, fine cutting wastes are produced from the transparent resin plate or protective film which may be stuck to the sides (la, la') by friction against the rotary circular saw blade rotating at high speed, or may be caught between the light transmitting plate obtained after the cutting and the protective film It is hard to remove the cutting wastes stuck to the sides (la, la') by friction, and when a colored protective film is used, colored cutting wastes arestucktotheside(la),whichmaydisturbinspection. Also, cutting wastes caught between the light transmitting plate and protective film may cause dimple called dent when thecutlight transmittingplates (1)arestackedupinmultiple layers. If the cutting wastes are firmly adhered to the light transmitting plate by static electricity when peeling the protective film it is also difficult to remove them.
By using infrared ray laser light, it may be cut off without producing cutting wastes, but a huge apparatus is needed for laser cutting, and depending on the type of the protective film the protective film and light transmitting plate may thermally fused at the cut ends.
If fused thermally, it is hard to separate the protective film from the light transmitting plate.
SUMMARY OF THE INVENTION The present inventor has intensively studied for developing a method capable of producing a transparent resin light plate easily from a transparent resin plate in the state where protective film is attached to the transparent resin plate without allowing cutting wastes to stick to the sides (la, la') or to be caught between the protective film and light transmitting plate or without thermal fusion of protective film with light transmitting plate As a result, it has been found that cutting canbe done without producingcuttingwastesorwithout heatingthe cut sections, andtherefore, can solve theproblems by using a cutting blade so as to contact it with a transparent resin plate from the side where the protective film is placed so that the transparent resin plate is cut off by brittle fracture. Such a cutting is suitable for producing light transmitting plate The present invention has been accomplished based on such findings.
The present invention provides a method for producing a light transmitting plate comprising the step of contacting at least one cutting blade with a transparent resin plate having a protective film attached to the surface thereof, from the side where the protective film (3) is attached, so that the transparent resin plate is cut off by brittle fracture together with the protective film In accordance with the production method of the present invention, transparent resin plate can be cut off without producing cutting wastes. Therefore, the cutting wastes are not stuck to the sides, or cutting wastes are not caught between the light transmitting plate and protective film or it is not necessary to heat the cut sections or fuse the protective film Asa result, the light transmitting plate can be easilymanufactured from the transparent resin plate under the conditions where the protective film is attached to the light transmitting plate.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. l(a) to Fig. l(c) are a set of schematic diagram showing a process for producing a light transmitting plate made from a transparent resin and attached to a protective film, by a production method of the present invention; Fig. 2 is a diagram showing an example application in use of a light transmitting plate; Fig. 3 is a sectional view schematically showing a structure of transparent resin plate or light transmitting plate to which protective film is attached; and Fig. 4 is a top view schematically showing the manner that a cutting blade contacts with a transparent resin plate from above the protective film attached to the plate.
PREFFED EMBODIMENTS OF THE INVENTION In the present invention, a transparent resin plate (2) having a protective film attached to or adhered on the surface thereof is utilized as a raw material, and is cut into a prescribed size so that a light transmitting plate is manufactured.
The transparent resin plate is a substantially transparent resin plate, and is preferably a methacrylic resin plate comprising a methacrylic resin, a methyl methacrylate-styrene copolymer resin (MS resin) plate comprising a copolymer of methyl methacrylate and styrene, and the like. The transparent resin plate may be substantially colorless plate. In the transparent resin plate elastic particles such as rubber particles may be dispersed in order to enhance the impact resistance. In the preferred embodiment of the present invention, however, such elastic particles are not substantially contained in the transparent resin plate since many of the elastic particles may scatter light. Instead, a plate made from a rigid methacrylic resin, a rigid MS resin or the like are preferably utilized in the present invention as the transparent resin plate, the plate having a Rockwell hardness of M80 to M110. The thickness of the transparent resin plate may be in the range of from about 2 mm to about 20 mm.
In the present invention, a transparent resin plate (2) having a protective film attached to or adhered on the surface thereof is cut together with the protective film The protective film may be a thermoplastic resin film made from, for example, an olefin resin such as polyethylene and polyethylene terephthalate resin. The protective film may have an adhesive layer of ethylene-vinyl acetate copolymer, acrylic adhesive, a straight-chain low-density polyethylene or the like, which may be provided on the adhesion side to the transparent resin plate. The protective film can be adhered to the transparent resin plate with the adhesion surface due to such an adhesive layer. The thickness of the protective film may be in the range of from about 40 pm to about 150 pm.
The protective film is preferably transparent for the ease of checking for presence or absence of foreign matter mixing inside of the transparent resin plate The protective film may be adhered only to one side of the transparent resin plate but is preferably adhered to each side of the transparent resin plate in order to protect both sides from flawing. In the case where the protective films are adhered to both sides of the transparent resin plate a coloredtransparentprotectivefilmmaybeadhered to one side and a colorless transparent protective film may be adhered to the other side, or different colored transparent protective films may be adhered to each side. This is helpful for distinguishing face and back of the transparent resin plate and of the resulting light transmitting plate When it is not necessary to distinguish the face and back, same colored transparent protective films may be adhered to both sides, or colorless protective films may be adhered to both sides.
In the present invention, the transparent resin plate is cut off by contacting at least one cutting blade (4) with (or pressing at least one cutting blade to) a transparent resin plate. By such a contact (or pressing), the transparent resin plate is cut off by brittle fracture together with the protective film while the protective film is adhered.
In the present invention, at least one cutting blade is utilized. Namely, one cutting blade may be used, or two or more cutting blades may be used. The cutting blade may be a known one, which exclude a rotary circular saw blade. For example, the cutting blades may be a pair of cutting blades (41, 42) disposed face to face on both sides of the transparent resin plate (which may be a continuous resin sheet) as a raw material to be cut off (See, Japanese Patent Application Laid-open No. H7-285099). In Fig. 1, the cutting blades are mounted on bases (412, 422).
As shown in Fig. 4, the cutting length (L4) of the cutting blade that is, the blade length is preferably the same as or more than the width of the transparent resin plate When the cutting length (L4) is shorter than the width of the plate it may be hard to cut the plate by contacting the cutting blade with (or pressing the cutting blade against) the surface of the plate Referring to Figs l(a) to one example method of the present invention can be described as follows: As shown in Figs. l(a) and the cutting blades (41, 42) are allowed to come to contact with the protective film and to be pressed against the transparent resin plate (2) so as to be closer to each other. During such a procedure, a brittle fracture point is generated in the transparent resin plate and spreads along the direction of the plate thickness, so that the transparent resin plate together with the protective film is cut off by the brittle fracture in the plate thickness before the cutting blades (41, 42) contact with each other. For pressing the cutting blades (41, 42), a pressing machine may be utilized. With a pressing machine (not shown), the cutting blades (41, 42) can be pressed down by external force through the bases (412, 422).
After cutting, as shown in Fig. the upper and lower cutting blades (41, 42) are departed from each other. At both sides of the cutting blades (41, 42), preferably, elastic materials (41R, 42R) are laid down along the cutting blades, which are higher than the cutter edges (411, 421). In this case, the protective film and the light transmitting plate obtained after cutting can be easily separated from the cutting blades by the repulsive force of the elastic materials, desirably. The elastic materials (41R, 42R) may be made of sponge and the like.
Thus, theprotectivefilm andtransparentresinplate are cut into a prescribed size by at least one cutting blade and a desired light transmitting plate of transparent resin is obtained. The light transmitting plate is obtained in a state where the protective film adhered to the surface thereof. In the production method of the present invention, it is designed to cut off by contacting the cutting blade with the transparent resin plate and therefore, the side face (la) of the light transmitting plate (which is a cutting section) is free from sticking of cutting wastes, and cutting wastes are not caught between the light transmitting plate and protective film Besides, since the cuttingportion (or section) is not heatedfor cutting, thermal fusion of the protective film and the resulting light transmitting plate does not take place, even if the transparent resin plate is a methacrylate resin plate or a methyl methacrylate-styrene copolymer resin plate, and the protective film is a thermoplastic resin film.
After cutting, the side surface of the light transmitting plate may be further finished by a post-treatment such as polishing or the like.
The invention being thus described, it will be apparent that the same may be varied in many ways. Such variations are to be regarded as within the spirit and scope of the invention, and all such modifications as would be apparent to one skilled in the art are intended to be within the scope of the following claims.
The entire disclosure of the Japanese Patent Application No. 2003-347996 filed on October 7, 2003, including specification, claims, summary and figures are incorporated herein by reference in their entirety.
Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that that prior art forms part of the common general knowledge in Australia.
Claims (3)
1. A method for producing a light transmitting plate comprising the step of contacting at least one cutting blade with a transparent resin plate having a protective film attached to the surface thereof, from the side where the protective film is attached, so that the transparent resin plate is cut off by brittle fracture together with the protective film.
2. The method according to claim 1, wherein the transparent resin material plate is a methacrylic resin plate or methyl methacrylate-styrene copolymer resin plate.
3. The method according to claim 1 or 2, wherein the protective film is a thermoplastic resin film. 14 A method of producing a light transmitting plate substantially as hereinbefore described with reference to the drawings and/or Examples. The steps, features, compositions and compounds disclosed herein or referred to or indicated in the specification and/or claims of this application, individually or collectively, and any and all combinations of any two or more of said steps or features. DATED this TWENTY SECOND day of SEPTEMBER 2004 Sumitomo Chemical Company, Limited by DAVIES COLLISON CAVE Patent Attorneys for the applicant(s) 5108
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003347996 | 2003-10-07 | ||
| JP2003-347996 | 2003-10-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2004214519A1 true AU2004214519A1 (en) | 2005-04-21 |
Family
ID=34540326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2004214519A Abandoned AU2004214519A1 (en) | 2003-10-07 | 2004-09-22 | Method for producing light transmitting plate |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR20050033806A (en) |
| CN (1) | CN1605891A (en) |
| AU (1) | AU2004214519A1 (en) |
| TW (1) | TW200517691A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100969343B1 (en) * | 2005-11-17 | 2010-07-09 | 아사히 가세이 케미칼즈 가부시키가이샤 | Light guide plate |
| JP5391238B2 (en) * | 2011-07-11 | 2014-01-15 | 住友化学株式会社 | Dot pattern printing light guide plate |
| TWI620963B (en) * | 2017-07-27 | 2018-04-11 | 群光電能科技股份有限公司 | Light guide member and manufacturing method thereof |
| CN108287386A (en) * | 2018-01-16 | 2018-07-17 | 滁州佳宏光电有限公司 | A kind of light-guide edge processing method |
| CN112829004B (en) * | 2020-12-29 | 2022-07-29 | 安捷利（番禺）电子实业有限公司 | Automatic die-cut covers membrane device |
| CN114609711B (en) * | 2022-03-09 | 2023-07-18 | 业成科技（成都）有限公司 | Manufacturing method of optical element, clamping device, display module and electronic equipment |
-
2004
- 2004-09-22 AU AU2004214519A patent/AU2004214519A1/en not_active Abandoned
- 2004-09-22 TW TW093128743A patent/TW200517691A/en unknown
- 2004-09-30 KR KR1020040077827A patent/KR20050033806A/en not_active Application Discontinuation
- 2004-09-30 CN CNA2004100900016A patent/CN1605891A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| TW200517691A (en) | 2005-06-01 |
| CN1605891A (en) | 2005-04-13 |
| KR20050033806A (en) | 2005-04-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK1 | Application lapsed section 142(2)(a) - no request for examination in relevant period |