WO2008062714A1 - Feuille mince pour guide optique, et appareil électronique utilisant cette feuille mince - Google Patents

Feuille mince pour guide optique, et appareil électronique utilisant cette feuille mince Download PDF

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Publication number
WO2008062714A1
WO2008062714A1 PCT/JP2007/072200 JP2007072200W WO2008062714A1 WO 2008062714 A1 WO2008062714 A1 WO 2008062714A1 JP 2007072200 W JP2007072200 W JP 2007072200W WO 2008062714 A1 WO2008062714 A1 WO 2008062714A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
light guide
sheet
reflective film
guide sheet
Prior art date
Application number
PCT/JP2007/072200
Other languages
English (en)
Japanese (ja)
Inventor
Motoyuki Suzuki
Hirotoshi Ohta
Kitaaki Ohmori
Original Assignee
Fuji Polymer Industries 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 Fuji Polymer Industries Co., Ltd. filed Critical Fuji Polymer Industries Co., Ltd.
Priority to JP2008545375A priority Critical patent/JP4834111B2/ja
Publication of WO2008062714A1 publication Critical patent/WO2008062714A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/83—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical 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
    • G02B6/0033—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
    • G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/054—Optical elements
    • H01H2219/062—Light conductor

Definitions

  • the present invention relates to a light guide sheet useful for illumination of operation keys or operation panels of a mobile phone, a personal digital assistant (PDA), a calculator, and the like, and an electronic device using the same.
  • PDA personal digital assistant
  • Portable electronic devices such as mobile phones, personal digital assistants (PDAs), and calculators require operation keys or operation panel illumination to enable use at night, at night, and in places.
  • these portable electronic devices preferably have less illumination power for the operation keys in order to prevent battery consumption.
  • LED light emitting diode
  • Patent Documents 1 and 2 disclose a device having a structure in which one LED is arranged for one switch.
  • the above apparatus has a problem that power consumption is large because a large number of LEDs are required.
  • the LEDs are placed under each switch, the thickness of the device increases, making it difficult to reduce the size of the device.
  • Patent Document 1 Japanese Utility Model Publication No. 7-10701
  • Patent Document 2 Japanese Utility Model Publication No. 6-36162
  • the present invention provides a light guide sheet that can reduce the number of LEDs in an electronic device and reduce the size of the electronic device, and an electronic device using the same.
  • the light guide sheet of the present invention is laminated on the reflection film, a plurality of print mark portions printed on the front surface of the reflection film, and the front surface of the reflection film, and the print mark portion is disposed therein.
  • a transparent sheet embedded and integrated with the reflective film wherein the transparent sheet has a visible light transmittance of 80% or more and 99% or less, and the transparent sheet has the transparent sheet on its end surface. It has a light incident part that allows light to enter inside, and the light incident The light incident on the inside of the transparent sheet from the portion can be reflected by the print mark portion and led out of the light guide sheet from the surface opposite to the surface of the transparent sheet on the reflective film side.
  • the electronic device of the present invention includes a light guide sheet of the present invention, a light source disposed adjacent to the light incident portion, a key switch disposed on the opposite side of the transparent sheet to the reflective film side, A wiring board disposed on the opposite side of the reflective film to the transparent light sheet side, and a metal dome disposed between the light guide sheet and the wiring board.
  • FIG. 1 is a plan view of an example of a light guide sheet of the present invention.
  • FIG. 2 is a cross-sectional view taken along line II in FIG.
  • FIG. 3 is a cross-sectional view of an example of a mobile phone using an example of the light guide sheet of the present invention.
  • FIG. 4 is an explanatory diagram for explaining the conditions for measuring the luminance of the light guide sheets of Examples and Comparative Examples.
  • the reflective film may be a single metal film such as aluminum, silver, or gold, and is disposed in contact with one main surface of the resin base film and the resin base film.
  • a method such as vapor deposition
  • the film containing the metal layer formed by this may be sufficient.
  • PET polyethylene terephthalate
  • the thickness of the resin substrate film is preferably 10-100 111, more preferably 20-80 111.
  • the preferred thickness of the metal layer is 10 to 100 nm, more preferably 20 to 50 nm.
  • Such reflective films are commercially available.
  • each print mark portion includes a base material and fine particles dispersed in the base material.
  • the base material contains as a main component a material having the same or similar refractive index as the material of the transparent sheet.
  • the transparent sheet is a silicone rubber sheet, it is preferable that the base material contains silicone rubber as a main component.
  • a suitable printing ink for forming the print mark portion examples include a silicone-based ink containing the fine particles.
  • the silicone-based ink includes, for example, the fine particles and a silicone rubber such as a thermosetting liquid rubber.
  • the silicone-based ink may further contain additives such as a heat-resistant agent, a flame retardant, an antibacterial agent, and an antifungal agent.
  • the printing ink is used after being mixed with a curing agent, for example.
  • the fine particles include titanium oxide fine particles, calcium carbonate fine particles, and barium sulfate fine particles.
  • the print ink and the print mark portion may contain only one kind of these fine particles, or may contain two or more kinds.
  • the average particle diameter of the fine particles is not particularly limited as long as it can reflect the light that has passed through the transparent sheet and entered the print mark portion. For example, 20 am or less is appropriate, and good printing can be performed. For the reason, it is preferably 1 ⁇ to 10 ⁇ m.
  • the amount of fine particles added to the silicone rubber can be determined by the range as long as the force reflection effect varies depending on the type and average particle size and the rubber elasticity of the printed mark is not impaired!
  • Examples of commercially available printing inks include silicone printing ink (manufactured by Toray Dow Co., Ltd., product name: "PRK-3 WHITE”). To 100 parts by weight of this silicone printing ink, 10 parts by weight of a curing agent (for example, product name “PRK-3 WHITE CAT-A” manufactured by Toray Dow Cowing Co., Ltd.) is stirred and mixed uniformly. These mixtures are sufficiently degassed with a vacuum deaerator. Using the mixture after defoaming, screen printing is performed at a predetermined position of the transparent sheet. For screen printing, for example, a screen having a dot-shaped hole is used.
  • a curing agent for example, product name “PRK-3 WHITE CAT-A” manufactured by Toray Dow Cowing Co., Ltd.
  • the printed ink is heated and cured for 30 minutes in a hot air circulation oven at 150 ° C., for example.
  • the plurality of print mark portions are: It is preferable that at least one of (c) is satisfied.
  • the shield area is larger as the print mark portion is farther from the light incident portion.
  • the shielding area refers to a contact area between each printed mark portion and the silicone rubber sheet.
  • the print mark portions that are farther from the light incident portion are thicker.
  • the concentration of light irregular reflection particles contained in the print mark is higher as the print mark portion is farther from the light incident portion.
  • Each print mark portion may be composed of a single mark, but may be composed of a plurality of dot shape marks, for example.
  • the distance from the light incident part is larger than the area of the dot shape mark at a position near the light incident part.
  • the area of the dot shape mark can be increased at a distance. In this case, it is easy to perform control for enhancing the uniformity of the luminance of light emitted from the light emitting surface of the light guide sheet, which is preferable.
  • Transparent sheets with visible light transmittance of 80% or more and 99% or less include transparent resin sheets containing polymetatalylate resin (PMMA), etc., or polyurethane (U) (U is classified according to ASTM D1419, and so on), polybutadiene (BR), styrene 'butadiene copolymer (SBR), butadiene-acrylonitrile copolymer (NBR), polyisoprene (IR), polychloroprene (CR), isobutylene-isoprene copolymer (IIR), ethylene-propylene copolymer Polymer (E PM), ethylene 'propylene terpolymer (EPDM), chlorosulfonated polyethylene (CSM), organic polysulfide (T), organic polysiloxane (Q), propylene hexafluoride, vinylidene fluoride copolymer
  • a transparent sheet having rubbery elasticity can be used, including an elastic material selected from organic synthetic rubber
  • silicone rubber sheet as a preferred example of the transparent sheet will be described.
  • silicone rubber used for forming the silicone rubber sheet include heat curable millable rubber, heat curable liquid rubber, and silicone gel. Among these, heat curable liquid rubber is preferable.
  • heat curable liquid rubber is preferable.
  • force addition reaction cross-linking such as organic peroxide cross-linking and addition reaction cross-linking is preferable.
  • the physical properties of silicone rubber after cross-linking are as follows: Hardness (JIS-K6253 compliant A-type hardness) Force 0-95 degrees, Tensile strength (JIS-K6251) 2MPa or more, Elongation (JIS-K6251) Is preferably 20% or more.
  • a transparent rubber material containing no filler for example, a transparent rubber material containing no filler is used.
  • the transparent rubber material may contain additives such as a heat-resistant agent, a flame retardant, an antibacterial agent, and an antifungal agent in addition to the silicone rubber as long as the object of the present invention is not impaired.
  • An example of a method for forming a silicone rubber sheet will be described below.
  • a film is formed by casting a liquid obtained by uniformly mixing a silicone rubber raw material and a crosslinking agent on a resin film such as a polyethylene terephthalate (PET) film.
  • a PET film is placed on the film.
  • the film sandwiched between two PET films is rolled to a predetermined thickness as necessary, and then heated, for example, in an atmosphere of 120 ° C. for 20 minutes to crosslink the silicone rubber raw material, and the film Is a silicone rubber sheet.
  • the average thickness of the silicone rubber sheet is not particularly limited as long as the visible light transmittance is 80% or more and 99% or less, but it is preferably 0.10—1.00 mm. 80 mm is more preferable.
  • a transparent sheet is laminated on the reflective film, and a laminated sheet in which the reflective film and the transparent sheet are integrated can be obtained.
  • the laminated sheet is cut into a predetermined shape according to the application.
  • a printed mark is formed on the front surface of the reflective film! /, But the reflective film and the transparent sheet do not contain air or the like in the laminated sheet in which the reflective film and the transparent sheet are integrated. Are integrated. These can not be easily peeled off. For this reason, dust does not enter between the reflective film and the transparent sheet, and the reflective film Since the interface between the transparent sheet and the transparent sheet can be kept clean, it is possible to prevent changes in the optical characteristics due to contamination of the interface.
  • FIG. 1 is a plan view of an example of the light guide sheet of the present invention.
  • One end face of the light guide sheet 10 has portions that are depressed and depressed in the central portion thereof as light incident portions 2a and 2b.
  • a light source such as an LED is disposed adjacent to the light incident portions 2a and 2b.
  • the light incident portions 2a and 2b can be easily formed by a method such as cutting.
  • FIG. 2 is a cross-sectional view taken along line I I of FIG.
  • the reflective film 6 is composed of a resin base film 6a and a metal layer 6b.
  • print mark portions 3a to 3i having a desired shape are printed (see FIG. 1).
  • the printing method is preferably print printing.
  • As the printing ink for example, an ink containing titanium oxide fine particles is used.
  • Light emitted from a light source such as the LED 4 enters the transparent sheet 1 from the light incident part 2 a and propagates through the transparent sheet 1.
  • Light that exceeds the critical angle by being reflected by the printed mark portions 3a to 3d is guided out of the transparent sheet 1 from the opposite surface of the transparent film 1 on the reflective film 6 side, for example, as indicated by arrows 5a to 5d. Light can be extracted from the light guide sheet 10.
  • a push button on the operation panel can be illuminated brightly.
  • all push buttons can be illuminated brightly by using only two LEDs for a single operation panel, and power consumption can be kept low.
  • FIG. 3 is a cross-sectional view of an example of a cellular phone using the light guide sheet of the present invention.
  • the light emitting diode (LED) 4 is arranged adjacent to the light incident part 2a of the light guide sheet!
  • the light of LED 4 is incident on the transparent sheet 1, and the light incident on the transparent sheet 1 propagates through the transparent sheet 1.
  • Light that exceeds the critical angle by being reflected by the print mark portions 3a to 3d is led out of the transparent sheet 1 from the surface opposite to the surface of the transparent sheet 1 on the reflective film 6 side.
  • the light extracted from the light guide sheet is directed toward the back of the key switch 14 disposed on the opposite side of the reflective film 6 side of the transparent sheet 1 to brighten the numerical values and symbols attached to the key switch 14. Illuminate.
  • a wiring board 13 (example For example, a printed wiring board) is disposed, and a metal dome 8 is disposed between the light guide sheet and the wiring board 13. That is, the adhesive layer 7, the metal dome 8, and the wiring board 13 are arranged in this order on the opposite side of the reflective film layer 6 from the transparent sheet 1 side.
  • the wiring substrate 13 includes, for example, a substrate 12 and wiring layers 9 and 11 formed on the substrate 12.
  • a transparent sheet having a high visible light transmittance is used, and light can be incident on the inside from the end face of the transparent sheet.
  • Multiple printed mark parts printed on the front surface of the reflective film can reflect the light that has entered the transparent sheet, and can be led out from the surface opposite the reflective film side of the transparent sheet. . Therefore, in the electronic device including the light guide sheet of the present invention, the number of LEDs can be reduced, and the uniformity of the luminance of light emitted from the light emitting surface of the light guide sheet can be improved. In addition, the thickness of the light emitting portion of the electronic device can be reduced. As a result, electronic devices such as mobile phones can be downsized. Furthermore, since the reflective film and the transparent sheet are integrated, dust or the like does not enter between the reflective film and the transparent sheet, and these interfaces can be kept clean. Therefore, it is possible to prevent the change in optical characteristics due to the contamination of the interface.
  • Silicone printing ink (Toray Dow Co., Ltd., product name, "PRK-3 WH
  • the film was sufficiently degassed by vacuum using a vacuum deaerator, and then screen-printed at a predetermined position of the reflective film using the defoamed mixture.
  • the reflection film was made of a polyethylene terephthalate (PET) base film and a metal layer formed by vapor-depositing aluminum on one main surface of the film. The printed mark was printed on the metal layer, and then the printed ink was applied at 150 ° C. And cured for 30 minutes in a hot air circulating oven.
  • PET polyethylene terephthalate
  • the screen printing was obtained by attaching a polyester screen (250 mesh) coated with an emulsifier to an aluminum frame, and peeling off the emulsifier in dots at multiple locations to form a plurality of openings. A screen was used. The dot-shaped opening of the screen was made larger as the distance closer to the light incident part of the silicone rubber sheet became smaller.
  • Liquid silicone rubber made by Shin-Etsu Chemical Co., Ltd., trade names "KE1935A” and “KE19 35B”: two-component mixed type
  • KE1935A Japanese Industrial Chemical Co., Ltd.
  • KE19 35B two-component mixed type
  • the defoamed mixed solution was cast on the surface of the reflective film on which the print mark portion was formed.
  • a film separator "No. 042" manufactured by Teraoka Seisakusho, product name: silicone adhesive separator, base material: polyester phenol # 50 was placed, and then the reflective film and film separator No.
  • the sandwiched mixture was rolled to a predetermined thickness with a constant speed roll, and then the uncured sheet obtained by rolling the mixture was heat-cured in a 120 ° C hot air circulating oven for 20 minutes. Thereafter, the film separator No. 042 "was peeled off from the cured sheet to obtain a sheet having an average thickness of 0.30 mm.
  • a transparent sheet (silicone rubber sheet) was separately prepared as described below, and its physical characteristics were measured.
  • Liquid silicone rubber made by Shin-Etsu Chemical Co., Ltd., trade names “KE1935A” and “KE19 35B”: two-component mixed type
  • KE1935A Japanese Industrial Chemical Co., Ltd.
  • KE19 35B two-component mixed type
  • the defoamed mixture was cast on a film separator ⁇ No. 0 42 "(manufactured by Teraoka Seisakusho, product name silicone adhesive separator, base material: polyester film # 50). On top of that, another film After placing the separator “No.
  • the mixture sandwiched between the two film separators was rolled to a predetermined thickness with a constant speed roll, and then the uncured sheet formed by rolling the mixture was removed. After heating and curing in a 120 ° C hot air circulating oven for 20 minutes, the upper and lower finale separators were peeled off from the cured sheet to obtain a cured silicone rubber sheet having a thickness of 0.25 mm.
  • the resulting silicone rubber sheet (transparent sheet) has a visible light transmittance of 90% (wavelength 380nm to 780nm! /, With light of shifted wavelength! /, Transmittance is 90%), hardness (JIS-K6253 compliant, A type hardness tester) 55 degrees, tensile strength (JIS-K6251 compliant) ) 6MPa, elongation (JIS — K6251 compliant) 350%.
  • the thickness of the printed mark portions a to c (after drying) is 17 to 25 111, and the thickness of the metal layer 6b is 20
  • the thickness of the resin base film 6a was 50 ⁇ m, and the thickness of the adhesive layer 8 was 30 to 40 ⁇ m (see FIG. 3).
  • the average thickness of the silicone rubber sheet with a reflective layer and the silicone rubber sheet 1 is a value obtained by measuring five points using a micrometer as defined in JIS B 7502 and averaging them.
  • the distance L between the LEDs was set to 20 mm.
  • Table 1 shows the print status of print mark parts a to c. Of Table 1
  • the numerical values are based on dot printing per unit area (lcm 2 ) of print mark parts a to c in FIG.
  • the shielding area ratio is shown.
  • the brightness of light emitted from the light emitting surface of the light guide sheet was measured.
  • the distance between the light-receiving surface of the luminance meter and the transparent sheet was 250 mm (same for Example 2 and Comparative Example 1! /).
  • the light guide sheet was incorporated into the mobile phone.
  • the full push button could be brightened and the power consumption could be kept low.
  • a light guide sheet was obtained in the same manner as in Example 1 except that the visible light transmittance of the silicone rubber sheet 1 (average thickness: 0.25 mm) was 80%. When the luminance was measured in the same manner as in Example 1, it was 25 to 45 cd / m 2 .
  • a light guide sheet was obtained in the same manner as in Example 1 except that the visible light transmittance of the silicone rubber sheet 1 (average thickness: 0.25 mm) was 78%. When the luminance was measured in the same manner as in Example 1, it was 8 to 40 cd / m 2 .

Abstract

La présente invention se rapporte à une feuille mince pour guide optique (10) comprenant un film réfléchissant (6), une pluralité de marques de repérage imprimées (3a à 3d) qui sont réalisées par impression sur la face antérieure du film réfléchissant (6), et une feuille transparente (1) superposée sur la face antérieure du film réfléchissant (6), la feuille transparente (1) portant les marques de repérage imprimées (3a à 3d) intégrées en elle après avoir été réunie au film réfléchissant (6). La feuille transparente (1) est dotée d'une capacité de transmission de la lumière visible de 80 à 99 %, et elle comporte - sur sa face d'extrémité - une zone d'incidence de lumière (2a) qui autorise une incidence de lumière à l'intérieur de la feuille transparente (1). La feuille mince pour guide optique (10) amène la lumière qui pénètre à l'intérieur de la feuille transparente (1) en provenance de la zone d'incidence de lumière (2a) à être réfléchie par les marques de repérage imprimées (3a à 3d), et à être guidée vers l'extérieur depuis la surface opposée à la surface de la feuille transparente (1) sur son côté du film réfléchissant (6).
PCT/JP2007/072200 2006-11-24 2007-11-15 Feuille mince pour guide optique, et appareil électronique utilisant cette feuille mince WO2008062714A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008545375A JP4834111B2 (ja) 2006-11-24 2007-11-15 導光シート及びこれを使用した電子機器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-317464 2006-11-24
JP2006317464 2006-11-24

Publications (1)

Publication Number Publication Date
WO2008062714A1 true WO2008062714A1 (fr) 2008-05-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009157218A1 (fr) * 2008-06-26 2009-12-30 日本メクトロン株式会社 Module de touche d’appareil portable
JP2010205417A (ja) * 2009-02-27 2010-09-16 Nec Lcd Technologies Ltd 面発光装置

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JPS6362104A (ja) * 1986-09-01 1988-03-18 株式会社明拓システム 電飾用光源装置
JPH0545651A (ja) * 1991-06-04 1993-02-26 Sumitomo Electric Ind Ltd 面光源装置
JP3025080U (ja) * 1995-11-22 1996-06-07 信越ポリマー株式会社 面状光源用導光体
JPH10197725A (ja) * 1997-01-14 1998-07-31 Minebea Co Ltd 面状光源装置
JP2001093319A (ja) * 1999-09-20 2001-04-06 Mitsubishi Chemicals Corp 面光源装置及びこれを用いた液晶ディスプレイ装置
JP2001167655A (ja) * 1999-12-09 2001-06-22 Citizen Electronics Co Ltd 押ボタンスイッチの照明装置
JP2004069751A (ja) * 2002-08-01 2004-03-04 Citizen Electronics Co Ltd 導光シート及びこれを組み込んだキースイッチ
JP2005129249A (ja) * 2003-10-21 2005-05-19 Yokogawa Electric Corp 導光板およびそれを用いた面発光装置
WO2006115113A1 (fr) * 2005-04-19 2006-11-02 Fujifilm Corporation Element optique, dispositif d'eclairage planaire et affichage a cristaux liquides

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JPH0620939Y2 (ja) * 1989-07-21 1994-06-01 豊興工業株式会社 パイロット操作逆止め弁

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Publication number Priority date Publication date Assignee Title
JPS6362104A (ja) * 1986-09-01 1988-03-18 株式会社明拓システム 電飾用光源装置
JPH0545651A (ja) * 1991-06-04 1993-02-26 Sumitomo Electric Ind Ltd 面光源装置
JP3025080U (ja) * 1995-11-22 1996-06-07 信越ポリマー株式会社 面状光源用導光体
JPH10197725A (ja) * 1997-01-14 1998-07-31 Minebea Co Ltd 面状光源装置
JP2001093319A (ja) * 1999-09-20 2001-04-06 Mitsubishi Chemicals Corp 面光源装置及びこれを用いた液晶ディスプレイ装置
JP2001167655A (ja) * 1999-12-09 2001-06-22 Citizen Electronics Co Ltd 押ボタンスイッチの照明装置
JP2004069751A (ja) * 2002-08-01 2004-03-04 Citizen Electronics Co Ltd 導光シート及びこれを組み込んだキースイッチ
JP2005129249A (ja) * 2003-10-21 2005-05-19 Yokogawa Electric Corp 導光板およびそれを用いた面発光装置
WO2006115113A1 (fr) * 2005-04-19 2006-11-02 Fujifilm Corporation Element optique, dispositif d'eclairage planaire et affichage a cristaux liquides

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009157218A1 (fr) * 2008-06-26 2009-12-30 日本メクトロン株式会社 Module de touche d’appareil portable
US8367950B2 (en) 2008-06-26 2013-02-05 Nippon Mektron, Ltd. Key module for mobile device
JP2010205417A (ja) * 2009-02-27 2010-09-16 Nec Lcd Technologies Ltd 面発光装置

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JPWO2008062714A1 (ja) 2010-03-04

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