TWI698405B - Light guide plate and glass plate - Google Patents

Light guide plate and glass plate Download PDF

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TWI698405B
TWI698405B TW105119244A TW105119244A TWI698405B TW I698405 B TWI698405 B TW I698405B TW 105119244 A TW105119244 A TW 105119244A TW 105119244 A TW105119244 A TW 105119244A TW I698405 B TWI698405 B TW I698405B
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glass plate
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transmittance
item
ppm
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TW105119244A
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TW201704172A (en
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村田哲哉
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日商日本電氣硝子股份有限公司
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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
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Glass Compositions (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Planar Illumination Modules (AREA)

Abstract

本發明的導光板的特徵在於：至少具有玻璃板，玻璃板中的Rh2 O3 的含量以質量計未滿1 ppm，且於玻璃板的光程長100 mm、波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差為12%以下。The light guide plate of the present invention is characterized by having at least a glass plate, the content of Rh 2 O 3 in the glass plate is less than 1 ppm by mass, and the optical path length of the glass plate is 100 mm, and the wavelength range is 400 nm to 750 nm The difference in transmittance between the maximum transmittance and the minimum transmittance in is 12% or less.

Description

導光板及玻璃板Light guide plate and glass plate

本發明是有關於一種導光板，尤其是有關於一種適合於邊緣光（edge light）型面發光裝置的導光板。The present invention relates to a light guide plate, in particular to a light guide plate suitable for edge light type surface light emitting devices.

自先前以來，於液晶電視機等中使用液晶顯示裝置。液晶顯示裝置具備面發光裝置、及配置於該面發光裝置的光出射面側的液晶面板。作為面發光裝置，例如已知有直下型與邊緣光型。Since the past, liquid crystal display devices have been used in liquid crystal televisions and the like. The liquid crystal display device includes a surface light-emitting device and a liquid crystal panel disposed on the light-emitting surface side of the surface light-emitting device. As a surface light emitting device, for example, a direct type and an edge light type are known.

於直下型面發光裝置中，光源配置在相對於光出射面成為相反側的背面。當使用發光二極體（Light Emitting Diode）等點光源作為光源時，為了彌補明亮度，而需要多個LED晶片，亮度特性的不均變得非常大。In the direct type surface light emitting device, the light source is arranged on the back surface opposite to the light exit surface. When a point light source such as a light emitting diode (Light Emitting Diode) is used as a light source, multiple LED chips are required to compensate for the brightness, and the unevenness of the brightness characteristics becomes very large.

因此，目前邊緣光型面發光裝置正成為主流。於邊緣光型面發光裝置中具備LED等光源、導光板、及反射膜等反射層。光源配置在相對於光出射面（表面）成為正交方向的端面。導光板是為了自端面取入來自光源的光並藉由全反射而使其傳導至內部，且自光出射面呈面狀地出射而配置。作為導光板，通常使用丙烯酸樹脂等的樹脂板（參照專利文獻1～專利文獻4）。反射層配置在與光出射面對向的背面側，並且為了使穿透至背面的光反射，並使液晶面板等的顯示面發光而配置。再者，為了使液晶面板等的顯示面均一地發光，有時亦於導光板的光出射面側配置擴散層。Therefore, the current edge light type surface light emitting device is becoming the mainstream. The edge light type surface light-emitting device is equipped with a light source such as an LED, a light guide plate, and a reflective layer such as a reflective film. The light source is arranged on an end surface in a direction orthogonal to the light exit surface (surface). The light guide plate is configured to take in the light from the light source from the end surface and transmit it to the inside by total reflection, and to emit it in a planar shape from the light exit surface. As the light guide plate, a resin plate such as acrylic resin is generally used (see Patent Document 1 to Patent Document 4). The reflective layer is arranged on the back side facing the light emission surface, and is arranged to reflect light that has penetrated to the back surface and to cause a display surface such as a liquid crystal panel to emit light. Furthermore, in order to make the display surface of a liquid crystal panel etc. emit light uniformly, a diffusion layer may be arrange|positioned on the light-exit surface side of a light guide plate.

圖1是表示邊緣光型面發光裝置1的一例的剖面概念圖。邊緣光型面發光裝置1具備：LED等光源2、導光板3、反射層4、以及擴散層5。來自光源2的光自導光板3的端面入射，並傳播至導光板3的內部。到達光反射面6的光由反射層4反射，然後朝光出射面7前進，並藉由擴散層5而擴散。作為結果，可使配置於擴散層5的上方的液晶面板等的顯示面均一地發光。再者，亦可於與使來自光源2的光入射的導光板3的端面為相反側的端面形成反射層。 [現有技術文獻] [專利文獻]FIG. 1 is a conceptual cross-sectional view showing an example of an edge light type surface light-emitting device 1. The edge light type surface light emitting device 1 includes a light source such as an LED, a light guide plate 3, a reflective layer 4, and a diffusion layer 5. The light from the light source 2 enters from the end surface of the light guide plate 3 and propagates to the inside of the light guide plate 3. The light reaching the light reflection surface 6 is reflected by the reflection layer 4, and then travels toward the light exit surface 7, and is diffused by the diffusion layer 5. As a result, the display surface of the liquid crystal panel or the like arranged above the diffusion layer 5 can be made to emit light uniformly. In addition, a reflection layer may be formed on the end surface of the light guide plate 3 on the opposite side to the end surface of the light guide plate 3 where the light from the light source 2 is incident. [Prior Art Document] [Patent Document]

專利文獻1：日本專利特開2012-123933號公報 專利文獻2：日本專利特開2012-138345號公報 專利文獻3：日本專利特開2012-216523號公報 專利文獻4：日本專利特開2012-216528號公報Patent Document 1: Japanese Patent Laid-Open No. 2012-123933 Patent Document 2: Japanese Patent Laid-Open No. 2012-138345 Patent Document 3: Japanese Patent Laid-Open No. 2012-216523 Patent Document 4: Japanese Patent Laid-Open No. 2012-216528 Bulletin

於邊緣光型面發光裝置中，若自光源產生光，則產生熱，伴隨於此，導光板的溫度亦上昇。而且，當使用樹脂板作為導光板時，導光板的由熱所引起的尺寸變化變得比液晶面板的尺寸變化大。其原因在於：樹脂板的熱膨脹係數高。例如，丙烯酸樹脂板的熱膨脹係數約為700×10-7/℃。因此，迄今為止，於液晶顯示裝置的邊框部分設置空隙來修正導光板的尺寸變化，使得不會產生因尺寸變化的差而產生不當的應力。 In the edge light type surface light emitting device, if light is generated from the light source, heat is generated, and the temperature of the light guide plate also rises with this. Moreover, when a resin plate is used as the light guide plate, the dimensional change of the light guide plate caused by heat becomes larger than that of the liquid crystal panel. The reason is that the thermal expansion coefficient of the resin plate is high. For example, the thermal expansion coefficient of an acrylic resin board is about 700×10 -7 /°C. Therefore, until now, a gap is provided in the frame portion of the liquid crystal display device to correct the dimensional change of the light guide plate, so that undue stress will not be generated due to the difference in the dimensional change.

但是，近年來，因液晶顯示裝置的窄邊框化，而難以藉由液晶顯示裝置的邊框部分來修正導光板的尺寸變化。 However, in recent years, due to the narrowing of the frame of the liquid crystal display device, it is difficult to correct the dimensional change of the light guide plate by the frame portion of the liquid crystal display device.

另外，於使用樹脂板作為導光板的情況下，當來自光源的光自端面入射並穿透至光出射面時，光量會被削弱。作為結果，顯示裝置的亮度特性容易下降。 In addition, in the case of using a resin plate as the light guide plate, when the light from the light source enters from the end surface and penetrates to the light exit surface, the amount of light is weakened. As a result, the brightness characteristics of the display device are easily degraded.

因此，本發明是鑒於所述情況而成者，其技術課題在於發明一種導光板，其伴隨溫度上昇，難以產生尺寸變化、且難以使顯示裝置的亮度特性下降。 Therefore, the present invention was made in view of the above-mentioned circumstances, and its technical problem is to invent a light guide plate in which dimensional changes are difficult to occur as the temperature rises, and it is difficult to reduce the brightness characteristics of a display device.

本發明者進行努力研究的結果發現，藉由選擇由溫度變化所引起的尺寸變化小的玻璃板作為導光板，並且減少玻璃板中的Rh2O3的含量、將玻璃板的透過率限制成規定範圍，則可解決所述技術課題，並作為本發明進行提案。即，本發明的導光板的特徵在於：至少具有玻璃板，玻璃板中的Rh2O3的含量以質量計未滿1ppm，且於玻璃板的光程長100mm、波長範圍400nm~750nm中的最大透過率與最小透過率的透過率差為12%以下。此處，「於光程長100mm、波長範圍400nm~750nm中的最大透過率與最小透過率」可藉由市售的透過率測定裝置來測定，例如可藉由島津製作所公司製造的UV-3100PC來測定。再者，只要無特別的明示，則「透過率」是指藉由數式1算出的內部透過率。As a result of diligent research, the inventors found that by selecting a glass plate with a small dimensional change caused by temperature changes as the light guide plate, and reducing the content of Rh 2 O 3 in the glass plate, the transmittance of the glass plate is limited to By specifying the range, the technical problem can be solved and proposed as the present invention. That is, the light guide plate of the present invention is characterized by having at least a glass plate, the content of Rh 2 O 3 in the glass plate is less than 1 ppm by mass, and the optical path length of the glass plate is 100 mm and the wavelength range of 400 nm to 750 nm The difference between the maximum transmittance and the minimum transmittance is 12% or less. Here, the "maximum transmittance and minimum transmittance in the optical path length of 100mm and the wavelength range of 400nm to 750nm" can be measured with a commercially available transmittance measuring device, for example, UV-3100PC manufactured by Shimadzu Corporation To determine. Furthermore, as long as there is no special indication, the "transmittance" refers to the internal transmittance calculated by Equation 1.

[數1] logTin =log(I1 /I0 )-logR logTin ：內部透過率（%） I0 ：入射的光的強度（%） I1 ：透過特定的光程長之後的光的強度（%） R：由反射所引起的光的衰減率（%）[Number 1] logT in =log(I 1 /I 0 )-logR logT in : Internal transmittance (%) I 0 : The intensity of incident light (%) I 1 : The amount of light passing through a specific optical path length Intensity (%) R: Attenuation rate of light caused by reflection (%)

液晶面板等顯示面板具有在一對玻璃板間夾入液晶元件等顯示元件的構造。因此，若選擇玻璃板作為導光板，則顯示面板與導光板的尺寸變化的差變小，而可適當地應對液晶顯示裝置等顯示裝置的窄邊框化。A display panel such as a liquid crystal panel has a structure in which a display element such as a liquid crystal element is sandwiched between a pair of glass plates. Therefore, if a glass plate is selected as the light guide plate, the difference in dimensional changes between the display panel and the light guide plate becomes small, and it is possible to appropriately cope with the narrowing of the frame of a display device such as a liquid crystal display device.

本發明者發現，若可見區域中的玻璃板的透過率差小，則顯示裝置的亮度特性提高。進而，本發明者發現，玻璃板中的Rh2 O3 會對波長450 nm附近的吸收帶來大的影響，若減少其含量，則可適宜地使可見區域中的玻璃板的透過率差下降。基於該些見解，於本發明中，藉由將玻璃板中的Rh2 O3 的含量限制成以質量計未滿1 ppm，並且將玻璃板於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差限制成12%以下，而顯著提高顯示裝置的亮度特性。The inventors found that if the difference in transmittance of the glass plate in the visible region is small, the brightness characteristics of the display device are improved. Furthermore, the present inventors found that Rh 2 O 3 in the glass plate has a great influence on the absorption near the wavelength of 450 nm, and if the content is reduced, the difference in transmittance of the glass plate in the visible region can be suitably reduced. . Based on these findings, in the present invention, the content of Rh 2 O 3 in the glass plate is limited to less than 1 ppm by mass, and the optical path length of the glass plate is 100 mm and the wavelength range is 400 nm～750. The difference between the maximum transmittance and the minimum transmittance in nm is limited to 12% or less, which significantly improves the brightness characteristics of the display device.

第二，本發明的導光板較佳為玻璃板中的Fe2 O3 的含量以質量計未滿50 ppm，且玻璃板於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率為85%以上。若減少玻璃板中的Fe2 O3 的含量，則可提高玻璃板於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率。Fe2 O3 於玻璃中以Fe3 + 或Fe2 + 的狀態存在。Fe3 + 於波長380 nm附近具有吸收峰值，並使紫外線區域、短波長側的可見區域中的透過率下降。Fe2 + 於波長1080 nm附近具有吸收峰值，並使長波長側的可見區域中的透過率下降。因此，若Fe2 O3 的含量變多，則於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率容易下降。通常，玻璃板自玻璃原料或製造步驟中混入有大量的Fe2 O3 。因此，先前的玻璃板因Fe2 O3 的含量多，故難以提高顯示裝置的亮度特性。因此，若將玻璃板中的Fe2 O3 的含量限制成以質量計未滿50 ppm，則可提高顯示裝置的亮度特性。再者，本發明中所述的「Fe2 O3 」包含二價的氧化鐵與三價的氧化鐵，將二價的氧化鐵換算成Fe2 O3 來處理。關於其他氧化物，亦同樣以表述的氧化物為基準來處理。Second, the light guide plate of the present invention is preferably that the content of Fe 2 O 3 in the glass plate is less than 50 ppm by mass, and the glass plate has the maximum transmittance in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm The rate is over 85%. If the Fe 2 O 3 content in the glass plate is reduced, the maximum transmittance of the glass plate in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm can be increased. Fe 2 O 3 exists in the state of Fe 3 + or Fe 2 + in the glass. Fe 3 + has an absorption peak near a wavelength of 380 nm, and lowers the transmittance in the ultraviolet region and the visible region on the short wavelength side. Fe 2 + has an absorption peak near the wavelength of 1080 nm, and lowers the transmittance in the visible region on the long wavelength side. Therefore, if the content of Fe 2 O 3 increases, the maximum transmittance in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm is likely to decrease. Generally, a large amount of Fe 2 O 3 is mixed into the glass sheet from the glass raw material or the manufacturing process. Therefore, since the conventional glass plate has a large Fe 2 O 3 content, it is difficult to improve the brightness characteristics of the display device. Therefore, if the content of Fe 2 O 3 in the glass plate is limited to less than 50 ppm by mass, the brightness characteristics of the display device can be improved. Furthermore, the "Fe 2 O 3 "in the present invention includes divalent iron oxide and trivalent iron oxide, and the divalent iron oxide is converted into Fe 2 O 3 for processing. Regarding other oxides, the same applies to the stated oxides.

第三，本發明的導光板較佳為玻璃板中的Cr2 O3 的含量以質量計為5 ppm以下。根據本發明者的調查，玻璃板中的Cr2 O3 會對波長630 nm附近的吸收帶來大的影響，若減少其含量，則可有效地使可見區域中的玻璃板的透過率差下降。Third, the light guide plate of the present invention preferably has a content of Cr 2 O 3 in the glass plate of 5 ppm or less by mass. According to the investigation of the present inventors, Cr 2 O 3 in the glass plate has a large influence on the absorption near the wavelength of 630 nm. If its content is reduced, the difference in transmittance of the glass plate in the visible region can be effectively reduced. .

第四，本發明的導光板較佳為於玻璃板的其中一個表面（較佳為光出射面）印刷有點圖案。若如此，則容易使自光出射面出射的光在面內均一化。Fourth, the light guide plate of the present invention is preferably printed with a dot pattern on one surface (preferably the light exit surface) of the glass plate. If so, it is easy to uniformize the light emitted from the light exit surface in the surface.

第五，本發明的導光板較佳為點圖案的點的直徑隨著遠離來自光源的光應入射的端面而逐漸變大。若如此，則容易使自光出射面出射的光在面內均一化。Fifth, in the light guide plate of the present invention, it is preferable that the diameter of the dots of the dot pattern gradually increases as the distance from the end surface where the light from the light source should be incident. If so, it is easy to uniformize the light emitted from the light exit surface in the surface.

第六，本發明的導光板較佳為玻璃板的端面（較佳為來自光源的光應入射的端面）的平均表面粗糙度Ra為0.5 μm以下。若如此，則當來自光源的光入射至端面時容易減少光損失。Sixth, the light guide plate of the present invention preferably has an end surface of the glass plate (preferably an end surface where light from a light source should be incident) with an average surface roughness Ra of 0.5 μm or less. If so, when the light from the light source enters the end surface, it is easy to reduce the light loss.

第七，本發明的導光板較佳為於來自光源的光應入射的端面以外的端面的全部或一部分形成有反射層。若如此，則傳播至玻璃板的內部的光難以自端面漏出。Seventh, the light guide plate of the present invention preferably has a reflective layer formed on all or a part of the end surface other than the end surface where light from the light source should enter. If so, the light propagating to the inside of the glass plate will hardly leak from the end surface.

圖2是表示本發明的導光板的一例的概念立體圖。如圖2所示，導光板10具備玻璃板11。來自光源12的光自玻璃板11的端面13入射，並傳播至玻璃板11的內部，且自光出射面出射。此處，玻璃板11中的Rh2 O3 的含量以質量計未滿1 ppm，且玻璃板11於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差為12%以下。另外，於玻璃板11的與光出射面對向的背面14形成有點圖案15。並且，點圖案15的點的直徑隨著自端面13向端面16而逐漸變大。藉由該點圖案15，自光出射面出射的光在面內得以均一化。進而，於玻璃板的端面16、端面17、端面18分別形成有反射層19。並且，到達玻璃板的端面16、端面17、端面18的光由反射層19反射而返回玻璃板11的內部，並最終自光出射面出射。Fig. 2 is a conceptual perspective view showing an example of the light guide plate of the present invention. As shown in FIG. 2, the light guide plate 10 includes a glass plate 11. The light from the light source 12 enters from the end surface 13 of the glass plate 11, propagates to the inside of the glass plate 11, and exits from the light exit surface. Here, the content of Rh 2 O 3 in the glass plate 11 is less than 1 ppm by mass, and the glass plate 11 has a maximum transmittance and a minimum transmittance in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm. The transmittance difference is less than 12%. In addition, a dot pattern 15 is formed on the back surface 14 of the glass plate 11 facing the light emission surface. In addition, the diameter of the dots of the dot pattern 15 gradually increases from the end surface 13 to the end surface 16. With this dot pattern 15, the light emitted from the light emitting surface is uniformized in the surface. Furthermore, a reflection layer 19 is formed on the end surface 16, the end surface 17, and the end surface 18 of the glass plate, respectively. Then, the light reaching the end surface 16, the end surface 17, and the end surface 18 of the glass plate is reflected by the reflective layer 19, returns to the inside of the glass plate 11, and finally exits from the light exit surface.

另外，亦可將本發明的玻璃板11接合多片而使用。例如，準備2片玻璃板11，在其中一片玻璃板11的端面17上不形成反射層，且在另一片玻璃板11的端面18上不形成反射層，將兩者的未形成的反射層的端面彼此利用折射率一致的透明黏接劑接合，藉此可製作大面積的導光板。In addition, a plurality of glass plates 11 of the present invention may be joined and used. For example, two glass plates 11 are prepared. No reflective layer is formed on the end surface 17 of one of the glass plate 11, and no reflective layer is formed on the end surface 18 of the other glass plate 11. The end faces are joined by a transparent adhesive with the same refractive index, thereby making a large-area light guide plate.

第八，本發明的導光板較佳為玻璃板以質量%計，含有40%～80%的SiO2 、1%～15%的Al2 O3 、0～20%的B2 O3 、0～20%的Na2 O、0～10%的MgO、0～15%的CaO、0～15%的SrO、0～35%的BaO作為玻璃組成。若如此，則玻璃板的熱膨脹係數容易下降。Eighth, the light guide plate of the present invention is preferably a glass plate, based on mass%, containing 40% to 80% of SiO 2 , 1% to 15% of Al 2 O 3 , and 0 to 20% of B 2 O 3 , 0 -20% Na 2 O, 0-10% MgO, 0-15% CaO, 0-15% SrO, 0-35% BaO as the glass composition. If so, the thermal expansion coefficient of the glass plate tends to decrease.

第九，本發明的導光板較佳為玻璃板的熱膨脹係數為120×10-7 /℃以下。此處，「熱膨脹係數」是指使用膨脹計，根據JIS R3102測定30℃～380℃下的平均熱膨脹係數所得的值。Ninth, the light guide plate of the present invention is preferably a glass plate with a thermal expansion coefficient of 120×10 -7 /°C or less. Here, the "coefficient of thermal expansion" refers to a value obtained by measuring the average coefficient of thermal expansion at 30°C to 380°C in accordance with JIS R3102 using a dilatometer.

第十，本發明的導光板較佳為用於邊緣光型面發光裝置。Tenth, the light guide plate of the present invention is preferably used in edge light type surface light emitting devices.

第十一，本發明的玻璃板的特徵在於：於光程長500 mm、波長範圍400 nm～750 nm中的最大透過率為93%以上。Eleventh, the glass plate of the present invention is characterized in that the maximum transmittance in the optical path length of 500 mm and the wavelength range of 400 nm to 750 nm is 93% or more.

第十二，本發明的玻璃板較佳為Rh2 O3 的含量以質量計未滿1 ppm，且Fe2 O3 的含量以質量計為10 ppm以下。Twelfth, in the glass plate of the present invention, it is preferable that the content of Rh 2 O 3 is less than 1 ppm by mass, and the content of Fe 2 O 3 is less than 10 ppm by mass.

第十三，本發明的玻璃板的特徵在於：於波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差為6%以下。Thirteenth, the glass plate of the present invention is characterized in that the difference between the maximum transmittance and the minimum transmittance in the wavelength range of 400 nm to 750 nm is 6% or less.

第十四，本發明的玻璃板較佳為於玻璃組成中包含Cr2 O3 與Fe2 O3 ，且質量比Cr2 O3 /Fe2 O3 為0.01～0.13。若將質量比Cr2 O3 /Fe2 O3 限制成所述範圍，則可盡可能地減少於波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差。Fourteenth, the glass plate of the present invention preferably contains Cr 2 O 3 and Fe 2 O 3 in the glass composition, and the mass ratio Cr 2 O 3 /Fe 2 O 3 is 0.01 to 0.13. If the mass ratio Cr 2 O 3 /Fe 2 O 3 is restricted to the above range, the difference between the maximum transmittance and the minimum transmittance in the wavelength range of 400 nm to 750 nm can be reduced as much as possible.

第十五，本發明的玻璃板較佳為玻璃組成中的Fe2 O3 的含量以質量計為1 ppm～10 ppm。Fifteenth, the glass plate of the present invention preferably has a Fe 2 O 3 content of 1 ppm to 10 ppm by mass in the glass composition.

第十六，本發明的玻璃板較佳為於光程長500 mm、波長範圍400 nm～750 nm中的最大透過率為93%以上。Sixteenth, the glass plate of the present invention preferably has an optical path length of 500 mm and a maximum transmittance of 93% or more in the wavelength range of 400 nm to 750 nm.

第十七，本發明的玻璃板較佳為於光程長0.15 mm、波長250 nm中的透過率為85%以上。Seventeenth, the glass plate of the present invention preferably has a transmittance of 85% or more in an optical path length of 0.15 mm and a wavelength of 250 nm.

於本發明的導光板中，玻璃板於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差較佳為12%以下、10%以下、8%以下、6%以下、5%以下，尤其為4%以下。若透過率差過大，則顯示裝置的亮度特性容易下降。In the light guide plate of the present invention, the difference between the maximum transmittance and the minimum transmittance of the glass plate in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm is preferably 12% or less, 10% or less, 8% Or less, 6% or less, 5% or less, especially 4% or less. If the difference in transmittance is too large, the brightness characteristics of the display device are likely to decrease.

於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率較佳為88%以上、90%以上、91%以上、92%以上、93%以上、94%以上、95%以上、96%以上、97%以上、98%以上，尤其為99%以上。若最大透過率過低，則顯示裝置的亮度特性容易下降。The maximum transmittance in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm is preferably 88% or more, 90% or more, 91% or more, 92% or more, 93% or more, 94% or more, 95% or more, More than 96%, more than 97%, more than 98%, especially more than 99%. If the maximum transmittance is too low, the brightness characteristics of the display device are likely to decrease.

於光程長200 mm、波長範圍400 nm～750 nm中的最大透過率較佳為86%以上、88%以上、90%以上、91%以上、92%以上、93%以上、94%以上、95%以上、96%以上、97%以上、98%以上，尤其為99%以上。若最大透過率過低，則顯示裝置的亮度特性容易下降。The maximum transmittance in the optical path length of 200 mm and the wavelength range of 400 nm to 750 nm is preferably 86% or more, 88% or more, 90% or more, 91% or more, 92% or more, 93% or more, 94% or more, Above 95%, above 96%, above 97%, above 98%, especially above 99%. If the maximum transmittance is too low, the brightness characteristics of the display device are likely to decrease.

於光程長500 mm、波長範圍400 nm～750 nm中的最大透過率較佳為85%以上、86%以上、88%以上、90%以上、91%以上、92%以上、93%以上、94%以上、95%以上、96%以上、97%以上、98%以上，尤其為99%以上。若最大透過率過低，則顯示裝置的亮度特性容易下降。The maximum transmittance in the optical path length of 500 mm and the wavelength range of 400 nm to 750 nm is preferably 85% or more, 86% or more, 88% or more, 90% or more, 91% or more, 92% or more, 93% or more, 94% or more, 95% or more, 96% or more, 97% or more, 98% or more, especially 99% or more. If the maximum transmittance is too low, the brightness characteristics of the display device are likely to decrease.

於本發明的導光板中，玻璃板於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率為85%以上，較佳為87%以上、88%以上、89%以上，尤其為90%以上。若最大透過率過低，則顯示裝置的亮度特性容易下降。In the light guide plate of the present invention, the maximum transmittance of the glass plate in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm is 85% or more, preferably 87%, 88%, or 89%, especially Is more than 90%. If the maximum transmittance is too low, the brightness characteristics of the display device are likely to decrease.

玻璃板中的Rh2 O3 的含量以質量計未滿1 ppm，較佳為0.8 ppm以下、0.6 ppm以下、0.01 ppm～0.5 ppm、0.05 ppm～0.4 ppm，尤其為0.1 ppm～0.3 ppm。若Rh2 O3 的含量過多，則於波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差容易變得過大。再者，若Rh2 O3 的含量過少，則於玻璃製造設備中難以使用高強度的Pt-Rh合金，玻璃板的製造成本上漲。The content of Rh 2 O 3 in the glass plate is less than 1 ppm by mass, preferably 0.8 ppm or less, 0.6 ppm or less, 0.01 ppm to 0.5 ppm, 0.05 ppm to 0.4 ppm, especially 0.1 ppm to 0.3 ppm. If the content of Rh 2 O 3 is too large, the transmittance difference between the maximum transmittance and the minimum transmittance in the wavelength range of 400 nm to 750 nm is likely to become too large. Furthermore, if the content of Rh 2 O 3 is too small, it is difficult to use a high-strength Pt-Rh alloy in glass manufacturing equipment, and the manufacturing cost of the glass plate increases.

為了盡可能地減少Rh2 O3 的含量，只要使用高純度玻璃原料、或以不混入Rh2 O3 的方式調整玻璃製造條件、或減少玻璃製造設備中的Pt-Rh合金的使用部位即可。In order to reduce the content of Rh 2 O 3 as much as possible, it is enough to use high-purity glass raw materials, or adjust the glass manufacturing conditions so that Rh 2 O 3 is not mixed, or reduce the use of Pt-Rh alloy in glass manufacturing equipment. .

玻璃板中的Cr2 O3 的含量較佳為以質量計為5 ppm以下、4 ppm以下、3 ppm以下、0.1 ppm～1.5 ppm、0.2 ppm～1 ppm，尤其為0.3 ppm～0.8 ppm。若Cr2 O3 的含量過多，則於波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差容易變得過大。再者，若Cr2 O3 的含量過少，則原料成本、玻璃板的製造成本上漲。The content of Cr 2 O 3 in the glass plate is preferably 5 ppm or less, 4 ppm or less, 3 ppm or less, 0.1 ppm to 1.5 ppm, 0.2 ppm to 1 ppm, especially 0.3 ppm to 0.8 ppm by mass. If the content of Cr 2 O 3 is too large, the transmittance difference between the maximum transmittance and the minimum transmittance in the wavelength range of 400 nm to 750 nm is likely to become too large. Furthermore, if the content of Cr 2 O 3 is too small, the cost of raw materials and the manufacturing cost of the glass plate increase.

玻璃板中的Fe2 O3 的含量較佳為以質量計為50 ppm以下、40 ppm以下、30 ppm以下、28 ppm以下、25 ppm以下、22 ppm以下、20 ppm以下、18 ppm以下、15 ppm以下、12 ppm以下、10 ppm以下、8 ppm以下、6 ppm以下，尤其為1 ppm～5 ppm。若Fe2 O3 的含量過多，則於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率容易下降。再者，若Fe2 O3 的含量以質量計少於1 ppm，則難以減小於波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差。The content of Fe 2 O 3 in the glass plate is preferably 50 ppm or less, 40 ppm or less, 30 ppm or less, 28 ppm or less, 25 ppm or less, 22 ppm or less, 20 ppm or less, 18 ppm or less by mass. ppm or less, 12 ppm or less, 10 ppm or less, 8 ppm or less, 6 ppm or less, especially 1 ppm to 5 ppm. If the content of Fe 2 O 3 is too large, the maximum transmittance in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm is likely to decrease. Furthermore, if the content of Fe 2 O 3 is less than 1 ppm by mass, it is difficult to reduce the transmittance difference between the maximum transmittance and the minimum transmittance in the wavelength range of 400 nm to 750 nm.

於波長範圍400 nm～750 nm中，波長550 nm附近的透過率相對容易變高，波長400 nm附近與波長750 nm附近的透過率相對容易變低。因此，若使波長550 nm附近的透過率稍許下降，同時提高波長400 nm附近與波長750 nm附近的透過率，則可盡可能地減小於波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差。根據本發明者的調查，若少量（較佳為以質量計為1 ppm～10 ppm，尤其為2 ppm～5 ppm）含有Fe2 O3 ，則可整體上提高於波長範圍400 nm～750 nm中的整體的透過率，同時使波長550 nm附近的透過率稍微下降，進而，若減少Cr2 O3 的含量，則可提高波長400 nm附近與波長750 nm附近的透過率。若依據所述見解，則質量比Cr2 O3 /Fe2 O3 較佳為0.01～0.13、0.0125～0.1、0.014～0.06，尤其為0.0167～0.0333。若質量比Cr2 O3 /Fe2 O3 為所述範圍之外，則於波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差容易變大。In the wavelength range of 400 nm to 750 nm, the transmittance around the wavelength of 550 nm is relatively easy to increase, and the transmittance around the wavelength of 400 nm and around the wavelength of 750 nm is relatively easy to decrease. Therefore, if the transmittance near the wavelength of 550 nm is slightly decreased, while the transmittance near the wavelength of 400 nm and the wavelength of 750 nm are increased, the maximum transmittance and the transmittance in the wavelength range of 400 nm to 750 nm can be reduced as much as possible. The transmittance difference of the minimum transmittance. According to the investigation of the present inventors, if Fe 2 O 3 is contained in a small amount (preferably 1 ppm to 10 ppm by mass, especially 2 ppm to 5 ppm), the entire wavelength range of 400 nm to 750 nm can be increased. At the same time, the overall transmittance in 550 nm is slightly reduced. Furthermore, if the content of Cr 2 O 3 is reduced, the transmittance in the vicinity of 400 nm and 750 nm can be increased. According to the above findings, the mass ratio Cr 2 O 3 /Fe 2 O 3 is preferably 0.01 to 0.13, 0.0125 to 0.1, 0.014 to 0.06, and particularly 0.0167 to 0.0333. If the mass ratio Cr 2 O 3 /Fe 2 O 3 is outside the above-mentioned range, the transmittance difference between the maximum transmittance and the minimum transmittance in the wavelength range of 400 nm to 750 nm is likely to increase.

為了盡可能地減少Cr2 O3 與Fe2 O3 的含量，只要使用高純度玻璃原料，或使用以Cr2 O3 與Fe2 O3 不混入玻璃原料中的方式設計的原料調配設備等即可。然而，若欲極端地減少Cr2 O3 與Fe2 O3 ，則會產生原料成本或生產成本上漲的問題。In order to reduce the content of Cr 2 O 3 and Fe 2 O 3 as much as possible, only use high-purity glass raw materials, or use raw material blending equipment designed so that Cr 2 O 3 and Fe 2 O 3 are not mixed into the glass raw materials. can. However, if Cr 2 O 3 and Fe 2 O 3 are to be extremely reduced, the problem of rising raw material costs or production costs will arise.

本發明的導光板中，較佳為盡可能地減少玻璃板中的V2 O5 、NiO、MnO2 、Nd2 O3 、CeO2 、Er2 O3 的含量。In the light guide plate of the present invention, it is preferable to reduce the content of V 2 O 5 , NiO, MnO 2 , Nd 2 O 3 , CeO 2 , and Er 2 O 3 in the glass plate as much as possible.

玻璃板中的V2 O5 的含量較佳為0.03質量%以下、0.02質量%以下、0.015質量%以下、0.01質量%以下、0.005質量%以下，尤其為0.003質量%以下。若V2 O5 的含量過多，則於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率容易下降。The content of V 2 O 5 in the glass plate is preferably 0.03 mass% or less, 0.02 mass% or less, 0.015 mass% or less, 0.01 mass% or less, 0.005 mass% or less, and particularly 0.003 mass% or less. If the content of V 2 O 5 is too large, the maximum transmittance in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm is likely to decrease.

玻璃板中的NiO的含量較佳為0.03質量%以下、0.02質量%以下、0.015質量%以下、0.01質量%以下、0.005質量%以下，尤其為0.003質量%以下。若NiO的含量過多，則於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率容易下降。The content of NiO in the glass plate is preferably 0.03 mass% or less, 0.02 mass% or less, 0.015 mass% or less, 0.01 mass% or less, 0.005 mass% or less, and particularly 0.003 mass% or less. If the content of NiO is too large, the maximum transmittance in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm is likely to decrease.

玻璃板中的MnO2 的含量較佳為0.03質量%以下、0.02質量%以下、0.015質量%以下、0.01質量%以下、0.005質量%以下，尤其為0.003質量%以下。若MnO2 的含量過多，則於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率容易下降。The content of MnO 2 in the glass plate is preferably 0.03% by mass or less, 0.02% by mass or less, 0.015% by mass or less, 0.01% by mass or less, 0.005% by mass or less, particularly 0.003% by mass or less. If the content of MnO 2 is too large, the maximum transmittance in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm is likely to decrease.

玻璃板中的Nd2 O3 的含量較佳為0.03質量%以下、0.02質量%以下、0.015質量%以下、0.01質量%以下、0.005質量%以下，尤其為0.003質量%以下。若Nd2 O3 的含量過多，則於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率容易下降。The content of Nd 2 O 3 in the glass plate is preferably 0.03 mass% or less, 0.02 mass% or less, 0.015 mass% or less, 0.01 mass% or less, 0.005 mass% or less, especially 0.003 mass% or less. If the content of Nd 2 O 3 is too large, the maximum transmittance in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm is likely to decrease.

玻璃板中的CeO2 的含量較佳為0.03質量%以下、0.02質量%以下、0.015質量%以下、0.01質量%以下、0.005質量%以下，尤其為0.003質量%以下。若CeO2 的含量過多，則於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率容易下降。The content of CeO 2 in the glass plate is preferably 0.03 mass% or less, 0.02 mass% or less, 0.015 mass% or less, 0.01 mass% or less, 0.005 mass% or less, and particularly 0.003 mass% or less. If the content of CeO 2 is too large, the maximum transmittance in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm is likely to decrease.

玻璃板中的Er2 O3 的含量較佳為0.03質量%以下、0.02質量%以下、0.015質量%以下、0.01質量%以下、0.005質量%以下，尤其為0.003質量%以下。若Er2 O3 的含量過多，則於光程長100 mm、波長範圍400 nm～750 nm中的最大透過率容易下降。The content of Er 2 O 3 in the glass plate is preferably 0.03 mass% or less, 0.02 mass% or less, 0.015 mass% or less, 0.01 mass% or less, 0.005 mass% or less, especially 0.003 mass% or less. If the content of Er 2 O 3 is too large, the maximum transmittance in the optical path length of 100 mm and the wavelength range of 400 nm to 750 nm is likely to decrease.

於本發明的導光板中，玻璃板的至少一邊的尺寸較佳為1000 mm以上、1500 mm以上、2000 mm以上、2500 mm以上，尤其為3000 mm以上。若如此，則可滿足顯示裝置的大型化的要求。In the light guide plate of the present invention, the size of at least one side of the glass plate is preferably 1000 mm or more, 1500 mm or more, 2000 mm or more, 2500 mm or more, especially 3000 mm or more. If this is the case, it is possible to meet the requirements for increasing the size of the display device.

玻璃板的熱膨脹係數較佳為120×10-7 /℃以下、95×10-7 /℃以下、70×10-7 /℃以下、60×10-7 /℃以下，尤其為50×10-7 /℃以下。若熱膨脹係數過高，則顯示面板與導光板的由熱所引起的尺寸變化的差變大。Thermal expansion coefficient of the glass sheet is preferably 120 × 10 -7 / ℃ less, 95 × 10 -7 / ℃ less, 70 × 10 -7 / ℃ less, 60 × 10 -7 / ℃ or less, in particular 50 × 10 - Below 7 /℃. If the coefficient of thermal expansion is too high, the difference in dimensional changes caused by heat between the display panel and the light guide plate will increase.

玻璃板的應變點較佳為460℃以上、480℃以上、500℃以上、520℃以上、530℃以上、550℃以上，尤其為590℃以上。若應變點過低，則玻璃板的耐熱性容易下降，例如若於高溫下使反射膜、擴散膜等在玻璃板的表面或端面成膜，則玻璃板容易熱變形。此處，「應變點」是指根據JIS R3103所測定的值。The strain point of the glass plate is preferably 460°C or higher, 480°C or higher, 500°C or higher, 520°C or higher, 530°C or higher, 550°C or higher, especially 590°C or higher. If the strain point is too low, the heat resistance of the glass plate is likely to decrease. For example, if a reflective film, a diffusion film, etc. are formed on the surface or end face of the glass plate at high temperature, the glass plate is likely to be thermally deformed. Here, "strain point" refers to a value measured in accordance with JIS R3103.

玻璃板較佳為以質量%計，含有40%～80%的SiO2 、1%～15%的Al2 O3 、0～20%的B2 O3 、0～20%的Na2 O、0～10%的MgO、0～15%的CaO、0～15%的SrO、0～35%的BaO作為玻璃組成。以下表示如所述般限制各成分的含量的原因。再者，於各成分的含有範圍的說明中，%這一表達是指質量%。The glass plate is preferably based on mass %, containing 40% to 80% of SiO 2 , 1% to 15% of Al 2 O 3 , 0 to 20% of B 2 O 3 , 0 to 20% of Na 2 O, 0-10% MgO, 0-15% CaO, 0-15% SrO, 0-35% BaO are used as glass composition. The reasons for limiting the content of each component as described above are shown below. In addition, in the description of the content range of each component, the expression% means mass %.

SiO2 是成為玻璃的網路形成體（network former）的成分，且為使熱膨脹係數下降、減少由熱所引起的尺寸變化的成分。另外，其為提高耐酸性、應變點的成分。SiO2 的適宜的下限範圍為40%以上、60%以上、65%以上、67%以上，尤其為70%以上，適宜的上限範圍為80%以下、78%以下、77%以下、75%以下，尤其為73%以下。若SiO2 的含量變多，則高溫黏性變高、熔融性下降，並且於成形時方矽石（cristobalite）的失透物容易析出。另一方面，若SiO2 的含量變少，則存在熱膨脹係數變高、由熱所引起的尺寸變化變大的傾向。另外，耐酸性、應變點容易下降。SiO 2 is a component that becomes a network former of glass, and is a component that lowers the coefficient of thermal expansion and reduces dimensional changes caused by heat. In addition, it is a component that improves acid resistance and strain point. The suitable lower limit range of SiO 2 is 40% or more, 60% or more, 65% or more, 67% or more, especially 70% or more, and the suitable upper limit range is 80% or less, 78% or less, 77% or less, 75% or less , Especially below 73%. When the content of SiO 2 increases, the high-temperature viscosity increases, the meltability decreases, and devitrification products of cristobalite are likely to precipitate during molding. On the other hand, when the content of SiO 2 decreases, the coefficient of thermal expansion increases and the dimensional change due to heat tends to increase. In addition, acid resistance and strain point tend to drop.

Al2 O3 是使熱膨脹係數下降、減少由熱所引起的尺寸變化的成分。另外，亦具有提高應變點、或於成形時抑制方矽石的失透物的析出的效果。Al2 O3 的適宜的下限範圍為1%以上、2%以上、5.5%以上、7%以上，尤其為10%以上，適宜的上限範圍為15%以下、13%以下，尤其為12%以下。若Al2 O3 的含量變多，則液相溫度上昇，而難以成形為玻璃板。另一方面，若Al2 O3 的含量變少，則存在熱膨脹係數變高、由熱所引起的尺寸變化變大的傾向。另外，應變點容易下降。Al 2 O 3 is a component that lowers the thermal expansion coefficient and reduces dimensional changes caused by heat. In addition, it also has the effect of increasing the strain point or suppressing the precipitation of devitrification products of cristobalite during molding. The suitable lower limit range of Al 2 O 3 is 1% or more, 2% or more, 5.5% or more, 7% or more, especially 10% or more, and the suitable upper limit range is 15% or less, 13% or less, especially 12% or less . When the content of Al 2 O 3 increases, the liquidus temperature rises, making it difficult to form into a glass sheet. On the other hand, when the content of Al 2 O 3 decreases, the coefficient of thermal expansion increases and the dimensional change due to heat tends to increase. In addition, the strain point tends to drop.

B2 O3 是作為熔劑發揮作用，並降低高溫黏性、改善熔融性的成分。另外，其是使熱膨脹係數下降、減少由熱所引起的尺寸變化的成分。B2 O3 的適宜的下限範圍為0%以上、3%以上、5%以上、7%以上、8%以上，尤其為10%以上，適宜的上限範圍為15%以下、13%以下，尤其為12%以下。若B2 O3 的含量變多，則應變點、耐酸性容易下降。另一方面，若B2 O3 的含量變少，則存在熱膨脹係數變高、由熱所引起的尺寸變化變大的傾向。另外，熔融性容易下降。B 2 O 3 is a component that functions as a flux, reduces high-temperature viscosity, and improves meltability. In addition, it is a component that lowers the thermal expansion coefficient and reduces the dimensional change caused by heat. The suitable lower limit range of B 2 O 3 is 0% or more, 3% or more, 5% or more, 7% or more, 8% or more, especially 10% or more, and the suitable upper limit range is 15% or less, 13% or less, especially Less than 12%. When the content of B 2 O 3 increases, the strain point and acid resistance tend to decrease. On the other hand, when the content of B 2 O 3 decreases, the coefficient of thermal expansion increases and the dimensional change due to heat tends to increase. In addition, meltability tends to decrease.

Na2 O是使高溫黏性下降，並改善熔融性的成分。Na2 O的適宜的下限範圍為0%以上、3%以上、5%以上、6%以上、7%以上，尤其為10%以上，適宜的上限範圍為20%以下、18%以下、16%以下，尤其為15%以下。若Na2 O的含量變多，則存在熱膨脹係數變高、由熱所引起的尺寸變化變大的傾向。另一方面，若Na2 O的含量變少，則熔融性容易下降。Na 2 O is a component that reduces high-temperature viscosity and improves meltability. The suitable lower limit range of Na 2 O is 0% or more, 3% or more, 5% or more, 6% or more, 7% or more, especially 10% or more, and the suitable upper limit range is 20% or less, 18% or less, 16% Below, especially 15% or less. As the content of Na 2 O increases, the coefficient of thermal expansion increases, and the dimensional change due to heat tends to increase. On the other hand, if the content of Na 2 O decreases, the meltability tends to decrease.

MgO是使高溫黏性下降，並改善熔融性的成分。MgO的適宜的下限範圍為0%以上、0.05%以上，尤其為0.1%以上，適宜的上限範圍為10%以下、6%以下、2%以下、1%以下，尤其為0.5%以下。若MgO的含量過多，則於成形時失透物容易析出。MgO is a component that reduces high-temperature viscosity and improves meltability. The suitable lower limit range of MgO is 0% or more, 0.05% or more, especially 0.1% or more, and the suitable upper limit range is 10% or less, 6% or less, 2% or less, 1% or less, especially 0.5% or less. If the content of MgO is too large, devitrified materials are likely to precipitate during molding.

CaO是不使應變點下降而僅使高溫黏性下降，並改善熔融性的成分。CaO的適宜的下限範圍為0%以上、0.5%以上、1%以上，尤其為2%以上，適宜的上限範圍為15%以下、14%以下、13%以下、8%以下，尤其為5%以下。若CaO的含量過多，則於成形時失透物容易析出。CaO is a component that does not lower the strain point but only lowers the high-temperature viscosity and improves the meltability. The suitable lower limit range of CaO is 0% or more, 0.5% or more, 1% or more, especially 2% or more, and the suitable upper limit range is 15% or less, 14% or less, 13% or less, 8% or less, especially 5% the following. If the content of CaO is too large, devitrified materials are likely to precipitate during molding.

SrO是提高耐化學品性、耐失透性的成分。SrO的適宜的下限範圍為0%以上、0.1%以上，尤其為0.5%以上，適宜的上限範圍為15%以下、10%以下，尤其為5%以下。若SrO的含量變多，則存在密度變高、或熱膨脹係數變高，由熱所引起的尺寸變化變大的傾向。另外，熔融性容易下降。SrO is a component that improves chemical resistance and devitrification resistance. The suitable lower limit range of SrO is 0% or more, 0.1% or more, especially 0.5% or more, and the suitable upper limit range is 15% or less, 10% or less, especially 5% or less. When the content of SrO increases, the density increases, or the thermal expansion coefficient increases, and the dimensional change due to heat tends to increase. In addition, meltability tends to decrease.

BaO是提高耐化學品性、耐失透性的成分。BaO的適宜的下限範圍為0%以上、0.1%以上，尤其為0.5%以上，適宜的上限範圍為35%以下、30%以下、20%以下，尤其為10%以下。若BaO的含量變多，則存在密度變高、或熱膨脹係數變高，由熱所引起的尺寸變化變大的傾向。另外，熔融性容易下降。BaO is a component that improves chemical resistance and devitrification resistance. The suitable lower limit range of BaO is 0% or more, 0.1% or more, especially 0.5% or more, and the suitable upper limit range is 35% or less, 30% or less, 20% or less, especially 10% or less. When the content of BaO increases, the density increases, or the thermal expansion coefficient increases, and the dimensional change due to heat tends to increase. In addition, meltability tends to decrease.

MgO與CaO的合計量的適宜的下限範圍為0%以上、0.1%以上、0.5%以上，尤其為1%以上，適宜的上限範圍為10%以下、8%以下、5%以下、3%以下，尤其為2%以下。若MgO與CaO的合計量過少，則熔融性容易下降。另一方面，若MgO與CaO的合計量過多，則熱膨脹係數與密度不適當地變高，另外，耐失透性容易下降。The suitable lower limit range of the total amount of MgO and CaO is 0% or more, 0.1% or more, 0.5% or more, especially 1% or more, and the suitable upper limit range is 10% or less, 8% or less, 5% or less, and 3% or less , Especially below 2%. If the total amount of MgO and CaO is too small, the meltability is likely to decrease. On the other hand, if the total amount of MgO and CaO is too large, the coefficient of thermal expansion and density become inappropriately high, and the devitrification resistance tends to decrease.

SrO與BaO的合計量的適宜的下限範圍為0%以上、0.1%以上、1%以上、1.5%以上，尤其為2%以上，適宜的上限範圍為35%以下、20%以下、10%以下，尤其為5%以下。若SrO與BaO的合計量過少，則熔融性容易下降。另一方面，若SrO與BaO的合計量過多，則熱膨脹係數與密度不適當地變高，另外，耐失透性容易下降。The suitable lower limit range of the total amount of SrO and BaO is 0% or more, 0.1% or more, 1% or more, 1.5% or more, especially 2% or more, and the suitable upper limit range is 35% or less, 20% or less, and 10% or less , Especially 5% or less. If the total amount of SrO and BaO is too small, the meltability is likely to decrease. On the other hand, if the total amount of SrO and BaO is too large, the coefficient of thermal expansion and density become inappropriately high, and the devitrification resistance tends to decrease.

Rh2 O3 、Cr2 O3 、Fe2 O3 、V2 O5 、NiO、MnO2 、Nd2 O3 、CeO2 及Er2 O3 的適宜的含量等如上所述。The appropriate contents of Rh 2 O 3 , Cr 2 O 3 , Fe 2 O 3 , V 2 O 5 , NiO, MnO 2 , Nd 2 O 3 , CeO 2 and Er 2 O 3 are as described above.

除所述成分以外，亦可導入其他成分。例如，為了使液相溫度下降，亦可導入各3%為止的Y2 O3 、La2 O3 、Nb2 O5 、P2 O5 ，為了使熔融溫度下降，亦可導入各6%為止的Li2 O、K2 O、Cs2 O，亦可導入合計量為2%為止的作為澄清劑的As2 O3 、Sb2 O3 、SnO2 、SO3 、F、Cl等。然而，As2 O3 、Sb2 O3 為環境負荷物質，另外，當藉由浮式法來使玻璃板成形時，於浮浴中得到還原而成為金屬異物，因此較佳為避免實質性的導入，具體而言，較佳為將其含量分別設為未滿0.01%。In addition to the aforementioned components, other components may also be introduced. For example, in order to lower the liquidus temperature, Y 2 O 3 , La 2 O 3 , Nb 2 O 5 , and P 2 O 5 may be introduced up to 3% each, and up to 6% each may be introduced to lower the melting temperature. As for Li 2 O, K 2 O, and Cs 2 O, it is also possible to introduce As 2 O 3 , Sb 2 O 3 , SnO 2 , SO 3 , F, Cl, etc. as fining agents up to 2% in total. However, As 2 O 3 and Sb 2 O 3 are environmentally hazardous substances. In addition, when the glass plate is formed by the float method, it is reduced in the floating bath and becomes a metal foreign substance. Therefore, it is better to avoid substantial Introducing, specifically, it is preferable to set the content to less than 0.01%.

於本發明的導光板中，玻璃板較佳為藉由溢流下拉法來成形而成。若如此，則於成形時難以產生玻璃帶的表背面的溫度差、組成差，並且容易不進行研磨而使表面品質良好的玻璃板成形，作為結果，容易謀求導光板的製造成本的低廉化、亮度特性的均一化。其原因在於：於溢流下拉法的情況下，應成為表面的面不與導水管狀耐火物接觸，而以自由表面的狀態成形。In the light guide plate of the present invention, the glass plate is preferably formed by an overflow down-draw method. If so, it is difficult to produce a temperature difference between the front and back of the glass ribbon and a difference in composition during molding, and it is easy to mold a glass plate with good surface quality without polishing. As a result, it is easy to reduce the manufacturing cost of the light guide plate. The uniformity of brightness characteristics. The reason is that in the case of the overflow down-draw method, the surface that should be the surface is not in contact with the water-conducting tubular refractory, but is formed in the state of a free surface.

再者，除溢流下拉法以外，亦可藉由流孔下拉（slot down draw）法、浮式法、輾平（roll out）法、再拉延（redraw）法等來使玻璃板成形。再者，浮式法中，於成形時容易產生玻璃帶的表背面的溫度差、組成差，但若嚴格地進行成形時的溫度控制，則可減少其溫度差、組成差。Furthermore, in addition to the overflow down-draw method, the glass plate may also be formed by a slot down draw method, a float method, a roll out method, a redraw method, and the like. Furthermore, in the float method, the temperature difference and composition difference between the front and back surfaces of the glass ribbon are likely to occur during molding, but if the temperature control during molding is strictly performed, the temperature difference and composition difference can be reduced.

本發明的導光板較佳為於玻璃板的其中一個表面（較佳為光出射面）印刷有點圖案。更佳為點圖案的點的直徑隨著遠離來自光源的光應入射的端面而逐漸變大。若如此，則容易使自光出射面出射的光在面內均一化。再者，點圖案例如可藉由對玻璃板的表面印刷耐熱油墨或玻璃料而形成。The light guide plate of the present invention is preferably printed with a dot pattern on one surface (preferably the light exit surface) of the glass plate. It is more preferable that the diameter of the dot of the dot pattern gradually becomes larger as it moves away from the end surface where the light from the light source should be incident. If so, it is easy to uniformize the light emitted from the light exit surface in the surface. Furthermore, the dot pattern can be formed, for example, by printing heat-resistant ink or glass frit on the surface of a glass plate.

於本發明的導光板中，玻璃板的端面（較佳為來自光源的光應入射的端面）的平均表面粗糙度Ra較佳為0.5 μm以下、0.3 μm以下、0.2 μm以下，尤其為0.1 μm以下。若如此，則當來自光源的光入射至端面時容易減少光損失。另外，容易於端面形成高品質的反射層。In the light guide plate of the present invention, the average surface roughness Ra of the end surface of the glass plate (preferably the end surface where light from the light source should be incident) is preferably 0.5 μm or less, 0.3 μm or less, 0.2 μm or less, especially 0.1 μm the following. If so, when the light from the light source enters the end surface, it is easy to reduce the light loss. In addition, it is easy to form a high-quality reflective layer on the end surface.

例如，若利用#2000的研磨石對玻璃板的端面進行研磨，則可盡可能地減少玻璃板的端面的平均表面粗糙度Ra。另外，若對玻璃板的端面進行蝕刻，則可不產生研磨損傷地減少玻璃板的端面的平均表面粗糙度Ra。For example, if the end surface of a glass plate is polished with a #2000 grinding stone, the average surface roughness Ra of the end surface of the glass plate can be reduced as much as possible. In addition, if the end surface of the glass plate is etched, the average surface roughness Ra of the end surface of the glass plate can be reduced without causing grinding damage.

玻璃板的端面較佳為不具有倒角部。若如此，則容易將來自光源的光取入至玻璃板的內部。The end surface of the glass plate preferably does not have a chamfered portion. If so, it is easy to take in the light from the light source into the glass plate.

本發明的導光板較佳為於來自光源的光應入射的端面以外的端面的全部或一部分形成有反射層，特佳為於來自光源的光應入射的端面以外的端面的全部形成有反射層。若如此，則傳播至玻璃板的內部的光難以自端面漏出。再者，作為反射層，可於端面直接形成反射膜，亦可於端面貼附反射密封材。The light guide plate of the present invention preferably has a reflective layer formed on all or part of the end face other than the end face where light from the light source should be incident, and it is particularly preferred that the reflective layer is formed on all the end faces other than the end face where light from the light source should be incident. . If so, the light propagating to the inside of the glass plate will hardly leak from the end surface. Furthermore, as the reflective layer, a reflective film can be formed directly on the end surface, or a reflective sealing material can be attached to the end surface.

本發明的導光板為了使自光出射面出射的光擴散，可於光出射面貼附擴散板，亦可於光出射面形成擴散層。In order to diffuse the light emitted from the light exit surface of the light guide plate of the present invention, a diffusion plate may be attached to the light exit surface, or a diffusion layer may be formed on the light exit surface.

本發明的導光板亦可有效用作兼具導光板的功能的顯示面板的基板。若如此，則可將顯示裝置的構件構成簡化。The light guide plate of the present invention can also be effectively used as a substrate of a display panel that also has the function of a light guide plate. If so, the component structure of the display device can be simplified.

本發明的玻璃板的特徵在於：於光程長500 mm、波長範圍400 nm～750 nm中的最大透過率為93%以上。另外，本發明的玻璃板的特徵在於：於波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差為6%以下。本發明的玻璃板的技術特徵已於本發明的導光板的說明欄中進行了記載，因此，此處省略詳細的說明。The glass plate of the present invention is characterized in that the maximum transmittance in the optical path length of 500 mm and the wavelength range of 400 nm to 750 nm is 93% or more. In addition, the glass plate of the present invention is characterized in that the difference between the maximum transmittance and the minimum transmittance in the wavelength range of 400 nm to 750 nm is 6% or less. The technical features of the glass plate of the present invention are described in the description column of the light guide plate of the present invention, and therefore, detailed descriptions are omitted here.

於本發明的玻璃板中，於光程長0.15 mm、波長250 nm中的透過率較佳為85%以上、88%以上、90%以上、92%以上、94%以上、95%以上，尤其為96%以上。若於光程長0.15 mm、波長250 nm中的透過率過低，則難以擴展至需要殺菌、殺病毒的用途。 [實施例1]In the glass plate of the present invention, the transmittance at an optical path length of 0.15 mm and a wavelength of 250 nm is preferably 85% or more, 88% or more, 90% or more, 92% or more, 94% or more, 95% or more, especially It is more than 96%. If the transmittance at the optical path length of 0.15 mm and the wavelength of 250 nm is too low, it is difficult to extend to applications requiring sterilization and virus killing. [Example 1]

以下，根據實施例來說明本發明。然而，以下的實施例僅為例示。本發明不受以下的實施例任何限定。Hereinafter, the present invention will be explained based on examples. However, the following examples are only examples. The present invention is not limited at all by the following examples.

表1示出了本發明的實施例（試樣No.1～No.4）。Table 1 shows examples of the present invention (sample No. 1 to No. 4).

[表1]

Figure 105119244-A0305-0001
[Table 1]
Figure 105119244-A0305-0001

首先，以成為表中的玻璃組成的方式將調配玻璃原料而成的玻璃批料放入鉑坩堝中，然後於1200℃～1450℃下熔融24小時。於進行玻璃批料的溶解時，使用鉑攪拌器進行攪拌並進行均質化。接著，於使熔融玻璃流出至碳板上而成形為板狀後，於緩冷點附近的溫度下緩冷30分鐘。針對所獲得的各試樣，評價於30℃～380℃的溫度範圍中的熱膨脹係數CTE、應變點Ps、於波長範圍400 nm～700 nm中的最大透過率及最小透過率。First, the glass batch material prepared by blending the glass raw materials was put into a platinum crucible so as to have the glass composition in the table, and then melted at 1200°C to 1450°C for 24 hours. When dissolving the glass batch material, a platinum stirrer was used for stirring and homogenization. Next, after flowing the molten glass onto the carbon plate and forming it into a plate shape, it was slowly cooled at a temperature near the slow cooling point for 30 minutes. For each sample obtained, the coefficient of thermal expansion CTE, the strain point Ps in the temperature range of 30°C to 380°C, the maximum transmittance and the minimum transmittance in the wavelength range of 400 nm to 700 nm were evaluated.

於30℃～380℃的溫度範圍中的熱膨脹係數CTE是使用膨脹計，根據JIS R3102測定30℃～380℃下的平均熱膨脹係數所得的值。應變點是根據JIS R3103所測定的值。The thermal expansion coefficient CTE in the temperature range of 30°C to 380°C is a value obtained by measuring the average thermal expansion coefficient at 30°C to 380°C using a dilatometer in accordance with JIS R3102. The strain point is a value measured in accordance with JIS R3103.

最大透過率與最小透過率是藉由島津製作所公司製造的UV-3100PC而測定的值。The maximum transmittance and the minimum transmittance are values measured by UV-3100PC manufactured by Shimadzu Corporation.

根據以上的結果，試樣No.1～No.4因應變點高而耐熱性高，因與樹脂板相比熱膨脹係數低，故伴隨溫度上昇而難以產生尺寸變化，且於波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差小。由此可認為，試樣No.1～No.4適宜作為導光板，尤其是用於邊緣光型面發光裝置的導光板。 [實施例2]Based on the above results, samples No. 1 to No. 4 have high strain points and high heat resistance, and have a low thermal expansion coefficient compared with resin plates, so that dimensional changes are difficult to occur with temperature rise, and they are in the wavelength range from 400 nm to 400 nm. The difference between the maximum transmittance and the minimum transmittance in 750 nm is small. Therefore, it can be considered that the samples No. 1 to No. 4 are suitable as light guide plates, especially light guide plates for edge-light type surface light-emitting devices. [Example 2]

首先，以質量%計，以含有69%的SiO2 、5.8%的Al2 O3 、10.2%的B2 O3 、3.1%的CaO、10.7%的Na2 O、0.9%的ZnO、0.3%的SnO2 作為玻璃組成的方式，將玻璃原料調配、混合後，於連續熔融爐內進行熔融，而獲得熔融玻璃。其次，藉由溢流下拉法來使所獲得的熔融玻璃成形為板狀，進行緩冷後，切斷成規定尺寸，並且將端面的表面粗糙度Ra研磨成0.3 μm，藉此獲得玻璃板。此處，當製作玻璃板時，以玻璃板中的Rh2 O3 的含量未滿0.2 ppm、Fe2 O3 的含量以質量計為5 ppm、Cr2 O3 的含量未滿0.1 ppm的方式，使用Fe2 O3 等著色雜質少的高純度玻璃原料作為玻璃原料，並且使用以Rh2 O3 等著色成分不會自玻璃板的製造設備混入至玻璃中的方式設計的玻璃製造設備。First, in terms of mass %, it contains 69% SiO 2 , 5.8% Al 2 O 3 , 10.2% B 2 O 3 , 3.1% CaO, 10.7% Na 2 O, 0.9% ZnO, 0.3% SnO 2 as a form of glass composition, the glass raw materials are prepared and mixed, and then melted in a continuous melting furnace to obtain molten glass. Next, the obtained molten glass is formed into a plate shape by an overflow down-draw method, and after slow cooling, it is cut into a predetermined size, and the surface roughness Ra of the end surface is polished to 0.3 μm to obtain a glass plate. Here, when the glass plate is made, the content of Rh 2 O 3 in the glass plate is less than 0.2 ppm, the content of Fe 2 O 3 is 5 ppm by mass, and the content of Cr 2 O 3 is less than 0.1 ppm. , Use high-purity glass raw materials such as Fe 2 O 3 with few coloring impurities as glass raw materials, and use glass manufacturing equipment designed so that coloring components such as Rh 2 O 3 do not mix into the glass from the glass plate manufacturing equipment.

針對所獲得的玻璃板，使用日立高新技術科學公司（Hitachi High-Tech Science Corporation）製造的UH4150實測於光程長150 mm、波長範圍400 nm～750 nm中的透過率，然後換算成光程長500 mm的內部透過率，結果於光程長500 mm、波長範圍400 nm～750 nm中的最大透過率為99%，於波長範圍400 nm～750 nm中的最大透過率與最小透過率的透過率差為3%。另外，將於光程長500 mm、波長範圍400 nm～750 nm下的透過率曲線示於圖3。For the obtained glass plate, the UH4150 manufactured by Hitachi High-Tech Science Corporation was used to measure the transmittance in the optical path length of 150 mm and the wavelength range of 400 nm to 750 nm, and then convert it to the optical path length The internal transmittance of 500 mm. As a result, the maximum transmittance in the wavelength range of 400 nm to 750 nm is 99% in the optical path length of 500 mm, and the maximum transmittance and minimum transmittance in the wavelength range of 400 nm to 750 nm. The rate difference is 3%. In addition, the transmittance curve at an optical path length of 500 mm and a wavelength range of 400 nm to 750 nm is shown in Figure 3.

進而，針對所獲得的玻璃板，利用所述方法測定於30℃～380℃的溫度範圍中的熱膨脹係數CTE，結果為66.3×10-7 /℃，並測定應變點，結果為536℃。Furthermore, for the obtained glass plate, the thermal expansion coefficient CTE in the temperature range of 30°C to 380°C was measured by the method described above, and the result was 66.3×10 -7 /°C, and the strain point was measured to be 536°C.

根據以上的結果，可認為具有該玻璃板的導光板是伴隨溫度上昇而難以產生尺寸變化、且可提高顯示裝置的亮度特性者。 [實施例3]Based on the above results, it can be considered that the light guide plate having the glass plate is one that is difficult to produce dimensional changes due to temperature rise and can improve the brightness characteristics of the display device. [Example 3]

首先，以質量%計，以含有69%的SiO2 、5.8%的Al2 O3 、10.2%的B2 O3 、3.1%的CaO、10.7%的Na2 O、0.9%的ZnO、0.3%的SnO2 作為玻璃組成的方式，將玻璃原料調配、混合後，於連續熔融爐內進行熔融，而獲得熔融玻璃。其次，藉由溢流下拉法來使所獲得的熔融玻璃成形為0.15 mm厚的板狀，進行緩冷後，切斷成規定尺寸，並且將端面的表面粗糙度Ra研磨成0.3 μm，藉此獲得玻璃板。此處，當製作玻璃板時，以玻璃板中的Rh2O3的含量未滿0.2ppm、Fe2O3的含量以質量計為4ppm、Cr2O3的含量未滿0.1ppm的方式，使用Fe2O3等著色雜質少的高純度玻璃原料作為玻璃原料，並且使用以Rh2O3等著色成分不會自玻璃板的製造設備混入至玻璃中的方式設計的玻璃製造設備。 First, in terms of mass %, it contains 69% SiO 2 , 5.8% Al 2 O 3 , 10.2% B 2 O 3 , 3.1% CaO, 10.7% Na 2 O, 0.9% ZnO, 0.3% SnO 2 as a form of glass composition, the glass raw materials are prepared and mixed, and then melted in a continuous melting furnace to obtain molten glass. Next, the molten glass obtained is shaped into a 0.15 mm thick plate by the overflow down-draw method, and after slow cooling, it is cut into a predetermined size, and the surface roughness Ra of the end surface is polished to 0.3 μm. Obtain a glass plate. Here, when the glass plate is produced, the content of Rh 2 O 3 in the glass plate is less than 0.2 ppm, the content of Fe 2 O 3 is 4 ppm by mass, and the content of Cr 2 O 3 is less than 0.1 ppm. A high-purity glass raw material with few coloring impurities such as Fe 2 O 3 is used as a glass raw material, and glass manufacturing equipment designed so that coloring components such as Rh 2 O 3 will not be mixed into the glass from the glass plate manufacturing equipment.

針對所獲得的玻璃板，使用日立高新技術公司(Hitachi High-Technologies Corporation)製造的U-4100實測於板厚0.15mm(光程長0.15mm)、波長範圍200nm~700nm中的透過率，然後換算成內部透過率。圖4是表示該試樣於波長範圍200nm~700nm中的透過率曲線(內部透過率曲線)的資料，圖5是表示於波長範圍200nm~700nm中的外部透過率曲線的資料。另外，如根據圖4、圖5所得知般，該試樣於波長250nm下的透過率(內部透過率)為96%，外部透過率為88%。 For the obtained glass plate, the U-4100 manufactured by Hitachi High-Technologies Corporation was used to measure the transmittance in the thickness of 0.15mm (optical path length 0.15mm) and the wavelength range of 200nm~700nm, and then convert it Into the internal transmittance. Fig. 4 is data showing the transmittance curve (internal transmittance curve) of the sample in the wavelength range of 200 nm to 700 nm, and Fig. 5 is data showing the external transmittance curve in the wavelength range of 200 nm to 700 nm. In addition, as can be seen from FIGS. 4 and 5, the transmittance (internal transmittance) of this sample at a wavelength of 250 nm is 96%, and the external transmittance is 88%.

進而，針對該玻璃試樣，利用所述方法測定於30℃~380℃的溫度範圍中的熱膨脹係數CTE，結果為66.3×10-7/℃。 Furthermore, for this glass sample, the thermal expansion coefficient CTE in the temperature range of 30 to 380°C was measured by the method described above, and the result was 66.3×10 -7 /°C.

根據以上所述，該玻璃試樣因使深紫外線良好地透過而適合於需要殺菌、殺病毒的用途，進而，因熱膨脹係數比石英玻璃高，故與陶瓷或金屬等的封接、密封性亦優異。 According to the above, this glass sample is suitable for applications that require sterilization and virus killing because of the good penetration of deep ultraviolet rays. Furthermore, since the coefficient of thermal expansion is higher than that of quartz glass, the sealing and sealing performance with ceramics or metals is also good. Excellent.

[產業上之可利用性] [Industrial availability]

本發明的玻璃板除導光板以外，亦適合於要求高透過率的用途。例如，適合於顯示器用玻璃基板、光通訊器件用玻璃基板、半導體製造製程用玻璃基板等。另外，本發明的玻璃板因於深紫外區域中的透過率高、熱膨脹係數比石英玻璃高，故可擴展至醫療、分析、環境、農工業等廣泛的領域。進而，本發明的玻璃因於紫外區域中的透過率高，故亦可加工成管形形狀而適宜地用作殺菌用燈。In addition to the light guide plate, the glass plate of the present invention is also suitable for applications requiring high transmittance. For example, it is suitable for glass substrates for displays, glass substrates for optical communication devices, and glass substrates for semiconductor manufacturing processes. In addition, the glass plate of the present invention has a high transmittance in the deep ultraviolet region and a higher thermal expansion coefficient than quartz glass, so it can be extended to a wide range of fields such as medical treatment, analysis, environment, and agriculture. Furthermore, since the glass of the present invention has a high transmittance in the ultraviolet region, it can be processed into a tube shape and can be suitably used as a sterilization lamp.

1‧‧‧邊緣光型面發光裝置2、12‧‧‧光源3、10‧‧‧導光板4、19‧‧‧反射層5‧‧‧擴散板（擴散層）6‧‧‧光反射面7‧‧‧光出射面11‧‧‧玻璃板13、16、17、18‧‧‧端面14‧‧‧背面15‧‧‧點圖案1‧‧‧Edge light type surface light emitting device 2,12‧‧‧Light source 3,10‧‧‧Light guide plate 4,19‧‧‧Reflective layer 5‧‧‧Diffusion plate (diffusion layer) 6‧‧‧Light reflection surface 7‧‧‧Light exit surface 11‧‧‧Glass plate 13,16,17,18‧‧‧End surface 14‧‧‧Back 15‧‧‧dot pattern

圖1是表示邊緣光型面發光裝置的一例的剖面概念圖。 圖2是表示本發明的導光板的一例的概念立體圖。 圖3是表示實施例2一欄中的試樣於光程長500 mm、波長範圍400 nm～750 nm中的透過率曲線的資料。 圖4是表示實施例3一欄中的試樣於板厚0.15 mm、波長範圍200 nm～700 nm中的透過率曲線（內部透過率曲線）的資料。 圖5是表示實施例3一欄中的試樣於板厚0.15 mm、波長範圍200 nm～700 nm中的外部透過率曲線的資料。Fig. 1 is a cross-sectional conceptual view showing an example of an edge light type surface light emitting device. Fig. 2 is a conceptual perspective view showing an example of the light guide plate of the present invention. Fig. 3 is data showing the transmittance curve of the sample in the column of Example 2 in the optical path length of 500 mm and the wavelength range of 400 nm to 750 nm. FIG. 4 is data showing the transmittance curve (internal transmittance curve) of the sample in the column of Example 3 in the thickness of 0.15 mm and the wavelength range of 200 nm to 700 nm. Fig. 5 is data showing the external transmittance curve of the sample in the column of Example 3 in a plate thickness of 0.15 mm and a wavelength range of 200 nm to 700 nm.

10‧‧‧導光板 10‧‧‧Light guide plate

11‧‧‧玻璃板 11‧‧‧Glass plate

12‧‧‧光源 12‧‧‧Light source

13、16、17、18‧‧‧端面 13, 16, 17, 18‧‧‧end face

14‧‧‧背面 14‧‧‧Back

15‧‧‧點圖案 15‧‧‧dot pattern

19‧‧‧反射層 19‧‧‧Reflective layer

Claims (17)

一種導光板，其特徵在於：至少具有玻璃板，前述玻璃板中的Rh2O3的含量以質量計為0.01ppm以上且未滿1ppm，且於前述玻璃板的光程長100mm、波長範圍400nm~750nm中的最大透過率與最小透過率的透過率差為6%以下。 A light guide plate, characterized by having at least a glass plate, the content of Rh 2 O 3 in the glass plate is 0.01 ppm or more and less than 1 ppm by mass, and the optical path length of the glass plate is 100 mm and the wavelength range is 400 nm The difference between the maximum transmittance and the minimum transmittance in ~750nm is 6% or less. 如申請專利範圍第1項所述的導光板，其中前述玻璃板中的Fe2O3的含量以質量計未滿50ppm，且前述玻璃板於光程長100mm、波長範圍400nm~750nm中的最大透過率為85%以上。 The light guide plate as described in item 1 of the scope of patent application, wherein the content of Fe 2 O 3 in the glass plate is less than 50 ppm by mass, and the glass plate has a maximum optical path length of 100 mm and a wavelength range of 400 nm to 750 nm The transmittance is over 85%. 如申請專利範圍第1項或第2項所述的導光板，其中前述玻璃板中的Cr2O3的含量以質量計為5ppm以下。 The light guide plate as described in item 1 or item 2 of the scope of patent application, wherein the content of Cr 2 O 3 in the aforementioned glass plate is 5 ppm or less by mass. 如申請專利範圍第1項或第2項所述的導光板，其中於前述玻璃板的其中一個表面印刷有點圖案。 According to the light guide plate described in item 1 or item 2 of the scope of patent application, a pattern is printed on one of the surfaces of the aforementioned glass plate. 如申請專利範圍第4項所述的導光板，其中前述點圖案的點的直徑隨著遠離來自光源的光應入射的端面而逐漸變大。 According to the light guide plate described in item 4 of the scope of patent application, the diameter of the dots of the aforementioned dot pattern gradually becomes larger as the distance from the end surface where the light from the light source should be incident. 如申請專利範圍第1項或第2項所述的導光板，其中前述玻璃板的端面的平均表面粗糙度Ra為0.5μm以下。 The light guide plate as described in item 1 or item 2 of the scope of patent application, wherein the average surface roughness Ra of the end surface of the aforementioned glass plate is 0.5 μm or less. 如申請專利範圍第1項或第2項所述的導光板，其中於來自光源的光應入射的端面以外的端面的全部或一部分形成有反射層。 According to the light guide plate described in the first or second patent application, a reflective layer is formed on all or a part of the end surface other than the end surface where light from the light source should be incident. 如申請專利範圍第1項或第2項所述的導光板，其中前述玻璃板以質量%計，含有40%~80%的SiO2、1%~15%的 Al2O3、0~20%的B2O3、0~20%的Na2O、0~10%的MgO、0~15%的CaO、0~15%的SrO、以及0~35%的BaO作為玻璃組成。 Such as the light guide plate described in item 1 or item 2 of the scope of patent application, wherein the aforementioned glass plate contains 40%~80% SiO 2 , 1%~15% Al 2 O 3 , 0~20% by mass % B 2 O 3 , 0-20% Na 2 O, 0-10% MgO, 0-15% CaO, 0-15% SrO, and 0-35% BaO are used as glass composition. 如申請專利範圍第1項或第2項所述的導光板，其中前述玻璃板的熱膨脹係數為120×10-7/℃以下。 The light guide plate as described in item 1 or item 2 of the scope of patent application, wherein the thermal expansion coefficient of the aforementioned glass plate is 120×10 -7 /°C or less. 如申請專利範圍第1項或第2項所述的導光板，其用於邊緣光型面發光裝置。 The light guide plate described in item 1 or item 2 of the scope of patent application is used for edge light type surface light emitting devices. 一種玻璃板，其特徵在於：玻璃板中的Rh2O3的含量以質量計為0.01ppm以上且未滿1ppm，且於玻璃板的光程長100mm、波長範圍400nm~750nm中的最大透過率與最小透過率的透過率差為6%以下，於光程長500mm、波長範圍400nm~750nm中的最大透過率為93%以上。 A glass plate, characterized in that: the content of Rh 2 O 3 in the glass plate is 0.01 ppm or more and less than 1 ppm by mass, and the optical path length of the glass plate is 100 mm and the maximum transmittance in the wavelength range of 400 nm to 750 nm The difference in transmittance from the minimum transmittance is 6% or less, and the maximum transmittance in the optical path length of 500 mm and the wavelength range of 400 nm to 750 nm is 93% or more. 如申請專利範圍第11項所述的玻璃板，其中Fe2O3的含量以質量計為10ppm以下。 As described in the 11th item of the scope of patent application, the content of Fe 2 O 3 is 10 ppm or less by mass. 如申請專利範圍第11項或第12項所述的玻璃板，其於光程長0.15mm、波長250nm中的透過率為85%以上。 For example, the glass plate described in item 11 or item 12 of the scope of patent application has a transmittance of 85% or more in an optical path length of 0.15mm and a wavelength of 250nm. 一種玻璃板，其特徵在於：玻璃板中的Rh2O3的含量以質量計為0.01ppm以上且未滿1ppm，且於玻璃板的光程長100mm、波長範圍400nm~750nm中的最大透過率與最小透過率的透過率差為6%以下，其中於玻璃組成中包含Cr2O3與Fe2O3，且質量比Cr2O3/Fe2O3為0.0435~0.13。 A glass plate, characterized in that: the content of Rh 2 O 3 in the glass plate is 0.01 ppm or more and less than 1 ppm by mass, and the optical path length of the glass plate is 100 mm and the maximum transmittance in the wavelength range of 400 nm to 750 nm The difference in transmittance from the minimum transmittance is 6% or less, in which Cr 2 O 3 and Fe 2 O 3 are included in the glass composition, and the mass ratio Cr 2 O 3 /Fe 2 O 3 is 0.0435 to 0.13. 如申請專利範圍第14項所述的玻璃板，其中玻璃組 成中的Fe2O3的含量以質量計為1ppm~10ppm。 As for the glass plate described in item 14 of the scope of patent application, the content of Fe 2 O 3 in the glass composition is 1 ppm to 10 ppm by mass. 如申請專利範圍第14項所述的玻璃板，其於光程長500mm、波長範圍400nm~750nm中的最大透過率為95%以上。 The glass plate described in item 14 of the scope of patent application has a maximum transmittance of 95% or more in the optical path length of 500 mm and the wavelength range of 400 nm to 750 nm. 如申請專利範圍第14項所述的玻璃板，其於光程長0.15mm、波長250nm中的透過率為85%以上。 The glass plate described in the 14th item of the scope of patent application has a transmittance of 85% or more in an optical path length of 0.15 mm and a wavelength of 250 nm.
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