CN206955905U

CN206955905U - Glass light guide plate

Info

Publication number: CN206955905U
Application number: CN201690000211.8U
Authority: CN
Inventors: 和田直哉
Original assignee: Asahi Glass Co Ltd
Current assignee: AGC Inc
Priority date: 2015-07-28
Filing date: 2016-07-26
Publication date: 2018-02-02
Anticipated expiration: 2026-07-26
Also published as: TW201713974A; WO2017018421A1

Abstract

Glass light guide plate 12 has light-emitting face 26 and light reflection surface 32, and with the light-incident end 28 perpendicular to light-emitting face 26 and light reflection surface 32.In addition, with the light incident side fillet surface 40 with light-emitting face 26 and the adjoining of light-incident end 28, and with the light incident side fillet surface 40 abutted with light reflection surface 32 and light-incident end 28.And, when using light incident side fillet surface 40 and light-emitting face 26 intersect o'clock as the 1st crosspoint P1, using light incident side fillet surface 40 and light-incident end 28 intersect o'clock as during the 2nd crosspoint P2, the tilt angle theta relative to light-incident end 28 for connecting P1 and P2 line segment L meets 0.01≤tan θ≤0.75.

Description

Glass light guide plate

Technical field

The present invention relates to glass plate.

Background technology

Have with liquid crystal TV set, digital signage etc. for the liquid crystal display device of representative：Form the luminous dress of planar of backlight The liquid crystal panel put and be oppositely disposed with the light-emitting face of sheet light emitting apparatus.Sheet light emitting apparatus has full run-down type and sidelight Type, but more use can realize the side light type of the miniaturization of light source.The sheet light emitting apparatus of side light type has light source, leaded light Plate, reflector plate and various optical sheets (diffusion sheet, blast piece etc.) etc..Disclosed in patent document 1,2 using internal transmission rate High, the also high and heat resistance of the rigidity also light guide plate of excellent glass plate as sheet light emitting apparatus.

Glass plate is compared with the acrylic acid resin plate used as light guide plate, and rigidity is higher, and heat resistance is also more excellent, but It is in the state after glass plate is cut, edge is intensity that is sharp and dangerous, and being likely to result in glass plate Reduce.Therefore, the chamfer machining to edge chamfering is carried out.Thus, have at the edge of glass plate relative to glass plate The fillet surface of principal plane and end slope.As disclosed in patent document 3, the shape of fillet surface is usually perpendicular to glass plate Principal plane and end face section in relative to the angle of inclination of principal plane and end face be 45 ° of shape.

Prior art literature

Patent document

Patent document 1：Japanese Unexamined Patent Publication 2013-093195 publications

Patent document 2：Japanese Unexamined Patent Publication 2013-030279 publications

Patent document 3：Japanese No. 2013/31548 publication of table again

The content of the invention

Invent problem to be solved

It is an object of the invention to provide for example can effectively using the sheet light emitting apparatus of the light quantity of light source in can be with The glass plate used as light guide plate.

The means used to solve the problem

According to the mode of the present invention, there is provided a kind of glass plate, it has principal plane and perpendicular to the end face of principal plane, And possess the fillet surface with principal plane and end surfaces between principal plane and end face, wherein,

In the 1st crosspoint and fall that in the section of principal plane and end face, connection fillet surface intersects with principal plane The tilt angle theta relative to end face of the line segment in the 2nd crosspoint that edged surface intersects with end face meets 0.01≤tan θ≤0.75.

According to another mode of the present invention, there is provided a kind of glass plate, it has principal plane and perpendicular to the end of principal plane Face, possesses the inclination between fillet surface and end face with the fillet surface and configuration of principal plane adjoining between principal plane and end face Face, wherein,

In the section of principal plane and end face,

To connect the 1st crosspoint that fillet surface and principal plane intersect and the 2nd crosspoint that fillet surface intersects with inclined plane Line segment relative to end face with tilt angle theta₁Inclined mode possesses the fillet surface,

Tilt angle theta₁Meet 0.01≤tan θ₁≤ 0.75,

Connect the 2nd crosspoint and the inclination relative to end face of the line segment in the 3rd crosspoint that inclined plane is intersected with end face Angle, θ₂Less than tilt angle theta₁, and meet 0 ＜ tan θ₂≤0.4。

Invention effect

According to the glass plate of the present invention, light can be effectively utilized when the light guide plate as such as sheet light emitting apparatus uses The light quantity in source.

Brief description of the drawings

Fig. 1 is the side view of the liquid crystal display device for the schematic configuration for representing liquid crystal display device.

Fig. 2 is the plan of glass plate.

Fig. 3 is the overall perspective view of glass plate.

Fig. 4 is the cutaway view Amplified image (eliminating a part) of glass plate.

Fig. 5 is the process chart of the manufacture method of the glass plate as embodiment.

Fig. 6 is the plan of the glass blank of glass plate.

Fig. 7 is the plan of glass baseplate obtained from glass-cutting blank.

Fig. 8 is the main portions amplification view that the cross sectional shape of light incident side fillet surface is the glass plate of arc-shaped.

Fig. 9 is the figure of the drafting for the ratio for representing the non-guided wave in the glass plate that thickness is 1.7mm relative to tan θ.

Figure 10 is the table for representing to be used for calculate the necessary data of the ratio of Fig. 9 non-guided wave by simulation.

Figure 11 is the drafting for the ratio for representing the non-guided wave in the glass plate that thickness is 2.5mm relative to tan θ Figure.

Figure 12 is the table for representing to be used for calculate the necessary data of the ratio of Figure 11 non-guided wave by simulation.

Figure 13 is the amplifier section sectional view of the glass plate in other embodiment.

Embodiment

Then, illustrated referring to the drawings for the preferred embodiment of the present invention.

It should be noted that in the record of accompanying drawing, for identical or corresponding component or part, assign identical or correspondingly Symbol, thus the repetitive description thereof will be omitted.In addition, unless specified, the purpose of accompanying drawing is not to represent between component or part Relative scale.Therefore,, can be by art technology with reference to following non-limiting embodiment for specific size Personnel determine.

[liquid crystal display device 10]

Fig. 1 is the side view of the liquid crystal display device 10 for the schematic configuration for representing liquid crystal display device 10.Fig. 2 is to be assembled to The plan of the glass plate 12 of embodiment in liquid crystal display device 10.

As shown in figure 1, liquid crystal display device 10 is to possess sheet light emitting apparatus 14 and liquid crystal panel with glass plate 12 16 mode is formed.Liquid crystal display device 10 can be carried to the electricity that slimming is realized such as liquid crystal TV set, digital signage Sub- equipment.

Liquid crystal panel 16 be laminated in a manner of clipping and being arranged on the central liquid crystal layer of thickness direction oriented layer, thoroughly Prescribed electrode, glass substrate and polarizing filter and form.In addition, the one side in liquid crystal layer is provided with colour filter.By transparent Apply driving voltage on electrode, the molecule of liquid crystal layer is rotated around with optical axis, thus carry out defined show.

As sheet light emitting apparatus 14, in order to realize slimming, using side light type.Sheet light emitting apparatus 14 has：Light source 18th, glass plate 12, reflector plate 20, various optical sheets 22 (diffusion sheet, blast piece etc.) and pip 24A~24C.

The light of the inside of glass plate 12 is incident to from light source 18, as direction of the arrows shown in fig, in the light-emitting face of glass plate 12 Repeat total reflection on 26 inner surface and the inner surface of light reflection surface 32 while advancing.In addition, pass through pip 24A ~24C and reflector plate 20 and change the light of direct of travel, from the light-emitting face relative with liquid crystal panel 16 with glass plate 12 26 are emitted to outside.The light for being emitted to outside (is made up of diffusion sheet, blast piece etc., can also may be used to be single by various optical sheet Think multiple) 22 diffusion after, be incident to liquid crystal panel 16.

Light source 18 is not particularly limited, and can use LED (light emitting diode), thermionic-cathode tube or cold-cathode tube.Light source 18 It is configured in the position relative with the light-incident end of glass plate 12 28.

In addition, setting reflector 30 by the rear side in light source 18, improve and enter from light source 18 with the light of radial transmitting It is incident upon the incident efficiency of glass plate 12.

Reflector plate 20 is formed by being coated to light reflecting member on the surface of the resin sheets such as acrylic resin.Reflector plate 20 are set in a manner of relative with the light reflection surface 32 of glass plate 12.In addition, reflector plate 20 can also be arranged at non-light incident side Face 34,36,38 (reference picture 2).Reflector plate 20 can vacate space from glass plate 12 in either case and set, and also may be used To be fitted in by adhesive on glass plate 12.Light reflection surface 32 refers to that the master relative with the light-emitting face of glass plate 12 26 puts down Face.In addition, light-incident end 28 refers to the end face of the glass plate 12 relative with light source 18.Non- light-incident end 34,36,38 refers to The end face of glass plate 12 in addition to light-incident end 28.

It should be noted that in the case where reflector plate 20 is arranged at into non-light-incident end, non-light-incident end 34, 36th, in 38, as long as being arranged on the non-light-incident end 38 relative with light-incident end 28.Thus, it is incident from light The incident light in end face 28 repeats total reflection in the inside of glass plate 12 on one side, while away from light source direction (towards Fig. 1 With the right in Fig. 2) advance, when reaching non-light-incident end 38, reflexed to again in glass plate 12 by reflector plate 20 Portion.In addition, in the case where being also disposed at reflector plate 20 on non-light-incident end 34,36, dissipated when in the inside of glass plate 12 When the light penetrated reaches non-light-incident end 34,36, by reflector plate 20 it can be made to reflex to the inside of glass plate 12 again. Thus, it is possible to effectively utilize the light quantity of light source 18.

As the material for the resin sheet for forming reflector plate 20, can exemplary propylene acid resin, but be not limited to this, can With using the polyester resin such as PET resin, polyurethane resin and by material etc. obtained from these resin combinations.

As the light reflecting member for forming reflector plate 20, can use for example：Include bubble or particle in resin Film, metal deposition film etc..

Adhesive layer can be set on reflector plate 20, and be fitted on glass plate 12.As being arranged on reflector plate 20 Adhesive layer, it can use for example：Acrylic resin, polyorganosiloxane resin, polyurethane resin, synthetic rubber etc..

The thickness of reflector plate 20 is not particularly limited, and can use such as 0.01mm~0.50mm reflector plate.

For various optical sheets 22, milky acrylic resin made membrane etc. can be used.With regard to various optical sheets For 22, in order to spread the light from the outgoing of light-emitting face 26 of glass plate 12, the rear side of liquid crystal panel 16 is irradiated without brightness Uneven uniform light.It should be noted that various optical sheets 22 by with glass plate 12 it is discontiguous in a manner of be oppositely disposed at On assigned position.

Glass plate 12 is made up of the high glass of transparency.In embodiments, the material as the glass as glass plate 12 Material, uses the oxide glass of multicomponent system.

Specifically, as glass plate 12, preferably using during length 50mm, being averaged under wavelength 400nm~700nm Internal transmission rate is more than 90% glass.Thus, it is possible to suppress to be incident to the decay of the light of glass plate 12 as far as possible.Length Transmissivity during 50mm is carried out as follows measure：For the direction cutting glass plate 12 by edge perpendicular to principal plane, from the glass The core of plate is with longitudinal 50mm × horizontal 50mm selection of dimension, relative to each other the 1st cut surface and the 2nd cut surface Arithmetic average roughness R_a≤ 0.03 μm of sample A, with the 50mm length of the normal direction from the 1st cut surface, profit With the spectroscopic measurement device of measure when can carry out length 50mm (such as：UH4150：Hitachi's high-tech company system), utilization is narrow Seam etc. makes the beamwidth of incident light be less than thickness of slab, is then measured.From thus obtained length 50mm when transmissivity in remove It is lost caused by the reflection on surface, thus obtains internal transmission rate during length 50mm.During length 50mm, wavelength Average internal transmissivity under 400nm~700nm is preferably more than 92%, and more preferably more than 95%, more preferably More than 98%, particularly preferably more than 99%.

The total amount A of the content of the iron of the glass used as glass plate 12 is below 100 mass ppm, this meet it is above-mentioned Length 50mm when, in terms of average internal transmissivity under wavelength 400nm~700nm be preferable, more preferably 40 mass Below ppm, more preferably below 20 mass ppm.On the other hand, the content of the iron of the glass used as glass plate 12 Total amount A is more than 5 mass ppm, and this is in the oxide glass manufacture of multicomponent system in the side for improving the meltability of glass Face is preferable, more preferably more than 8 mass ppm, more preferably more than 10 mass ppm.It should be noted that as glass The amount for the iron that the total amount A of the content of the iron for the glass that glass plate 12 uses is added when can be according to glass manufacture is adjusted.

In this manual, although by the total amount A of the content of the iron of glass with Fe₂O₃Content represent, but simultaneously non-glass Present in iron all with Fe³⁺The form of (ferric iron) is present.Generally, Fe in glass³⁺And Fe²⁺(ferrous iron) exists simultaneously. Fe²⁺And Fe³⁺Exist in the range of wavelength 400nm~700nm and absorb, but Fe²⁺Absorption coefficient (11cm^-1mol^-1) ratio Fe³⁺Absorption coefficient (0.96cm^-1mol^-1) order of magnitude greater, therefore make the internal transmission rate under wavelength 400nm~700nm Further reduce.Therefore, Fe²⁺Content it is few be preferred in terms of the internal transmission rate under improving wavelength 400nm~700nm 's.

The Fe of the glass used as glass plate 12²⁺Content B be below 20 mass ppm, this is under effective optical path length Meet it is preferable in terms of the average internal transmissivity of above-mentioned visible region, more preferably below 10 mass ppm, further Preferably below 5 mass ppm.On the other hand, the Fe of the glass used as glass plate 12²⁺Content B be 0.01 mass ppm More than, this multicomponent system oxide glass manufacture when in the meltability raising for making glass in terms of be it is preferable, it is more excellent Elect as more than 0.05 mass ppm, more preferably more than 0.1 mass ppm.

It should be noted that the Fe of the glass used as glass plate 12²⁺Content add when can be according to glass manufacture Oxidant amount or melting temperature etc. be adjusted.For the specific species of oxidant added during glass manufacture and they Addition is as described later.Fe₂O₃Content A be by fluorescent X-ray measure obtain, be converted into Fe₂O₃Total iron content (quality ppm). Fe²⁺Content B be measured according to ASTM C169-92.It should be noted that the Fe of measure²⁺Content It is converted into Fe₂O₃Represent.

The concrete example of the composition of the glass used as glass plate 12 is as follows.But used as glass plate 12 The composition of glass is not limited to these.

One configuration example (configuration example A) of the glass used as glass plate 12 is with the quality percentage table of oxide benchmark Show containing 60%~80% SiO₂, 0%~7% Al₂O₃, 0%~10% MgO, 0%~20% CaO, 0%~15% SrO, 0%~15% BaO, 3%~20% Na₂O, 0%~10% K₂O, 5~100 mass ppm Fe₂O₃。

Another configuration example (configuration example B) of the glass used as glass plate 12 is with the quality percentage of oxide benchmark Expression contains 45%~80% SiO₂, more than 7% and less than or equal to 30% Al₂O₃, 0%~15% B₂O₃, 0%~15% MgO, 0%~6% CaO, 0%~5% SrO, 0%~5% BaO, 7%~20% Na₂O, 0%~10% K₂O, 0%~10% ZrO₂, 5~100 mass ppm Fe₂O₃。

Another configuration example (configuration example C) of the glass used as glass plate 12 is with the quality percentage of oxide benchmark Expression contains 45%~70% SiO₂, 10%~30% Al₂O₃, 0%~15% B₂O₃, total 5%~30% MgO, CaO, SrO and BaO, total more than 0% and the Li less than 3%₂O、Na₂O and K₂O, 5~100 mass ppm Fe₂O₃。

But it is not limited to these as the glass that glass plate 12 uses.

Below for the composition of each composition of the composition of the glass of the glass plate 12 of the present embodiment with mentioned component Scope illustrates.It should be noted that the unit of the content respectively formed represented with the quality percentage of oxide benchmark or Quality ppm is represented, is represented simply as " % ", " ppm " respectively.

SiO₂For the main component of glass.

For the weatherability of the glass of holding, devitrification characteristic, SiO₂Content in configuration example A be preferably more than 60%, More preferably more than 63%, it is preferably more than 45%, more preferably more than 50% in configuration example B, is preferably in configuration example C More than 45%, more preferably more than 50%.

On the other hand, in order that melting easy, good bubble quality is obtained, and in order to by the ferrous iron in glass (Fe²⁺) content suppress low, obtain good optical characteristics, SiO₂Content in configuration example A be preferably less than 80%, more Preferably less than 75%, it is preferably less than 80%, more preferably less than 70% in configuration example B, is preferably in configuration example C Less than 70%, more preferably less than 65%.

Al₂O₃In configuration example B and C for improve glass weatherability neccessary composition.In the glass of present embodiment, In order to keep necessary weatherability, Al in practicality₂O₃Content in configuration example A be preferably more than 1%, more preferably 2% with On, 7%, more preferably more than 10% is preferably greater than in configuration example B, is preferably more than 10% in configuration example C, more preferably For more than 13%.

However, in order to by ferrous iron (Fe²⁺) content suppress low, obtain good optical characteristics, and obtain good Bubble quality, Al₂O₃Content in configuration example A be preferably less than 7%, more preferably less than 5%, in configuration example B preferably It is preferably less than 30%, more preferably less than 20% in configuration example C for less than 30%, more preferably less than 23%.

B₂O₃For the composition for promoting the melting of frit, improving mechanical property, weatherability, but in order to not produce by volatilizing A problem that generation of caused striped (ream), erosion of furnace wall, B₂O₃Content in glass A be preferably less than 5%, More preferably less than 3%, it is preferably less than 15%, more preferably less than 12% in configuration example B and C.

Li₂O、Na₂O and K₂The alkali metal oxides such as O are the melting for promoting frit, regulation thermal expansion, viscosity etc. Useful composition.

Therefore, Na₂O content is preferably more than 3%, more preferably more than 8% in configuration example A.Na₂O content is in structure It is preferably more than 7%, more preferably more than 10% into example B.However, in order to keep melt when it is clarification, keep manufacture The bubble quality of glass, Na₂O content is preferably less than 20%, more preferably less than 15% in configuration example A and B, It is preferably less than 3%, more preferably less than 1% in configuration example C.

In addition, K₂O content is preferably less than 10%, more preferably less than 7% in configuration example A and B, in configuration example C In be preferably less than 2%, more preferably less than 1%.

In addition, Li₂O is optional member, but in order that vitrifying becomes easy, is contained as the impurity from raw material Some iron contents suppress low, and suppress low by batch cost, in configuration example A, B and C, can contain less than 2% Li₂O。

In addition, in order to keep melt when it is clarification, and keep manufacture glass bubble quality, these alkali metal oxygen Total content (Li of compound₂O+Na₂O+K₂O it is preferably) 5%~20%, more preferably 8%~15% in configuration example A and B, It is preferably 0%~2%, more preferably 0%~1% in configuration example C.

The alkaline earth oxides such as MgO, CaO, SrO and BaO be for promote frit melting, regulation thermal expansion, The useful composition such as viscosity.

Viscosity, promotion when MgO has the function that to reduce glass melting melt.In addition, in order to make proportion reduce, make Glass plate is not easy with effect defective, in configuration example A, B and C, can contain MgO.In addition, in order to reduce glass Thermal coefficient of expansion, good devitrification characteristic is obtained, MgO content is preferably less than 10%, more preferably 8% in configuration example A Hereinafter, it is preferably less than 15%, more preferably less than 12% in configuration example B, is preferably less than 10% in configuration example C, more Preferably less than 5%.

CaO is the composition of the melting and regulation viscosity, thermal expansion etc. that promote frit, therefore in configuration example A, B and C CaO can be contained.In order to obtain above-mentioned effect, CaO content is preferably more than 3% in configuration example A, more preferably 5% with On.It is preferably less than 20%, more preferably less than 10% in configuration example A, in configuration example B in addition, in order to improve devitrification Preferably less than 6%, more preferably less than 4%.

SrO has increase thermal coefficient of expansion and reduces the effect of the high temperature viscosity of glass.In order to obtain the effect, forming In example A, B and C, SrO can be contained.However, in order to suppress low the thermal coefficient of expansion of glass, SrO content is in configuration example A With in C be preferably less than 15%, more preferably less than 10%, in configuration example B be preferably less than 5%, more preferably 3% with Under.

The effect of the BaO high temperature viscosities that there is increase thermal coefficient of expansion and reduce glass same with SrO.It is above-mentioned in order to obtain Effect, BaO can be contained.It is preferably 15% in configuration example A and C however, in order to suppress low the thermal coefficient of expansion of glass Hereinafter, more preferably less than 10%, it is preferably less than 5%, more preferably less than 3% in configuration example B.

In addition, in order to suppress low thermal coefficient of expansion, good devitrification characteristic is obtained, and keeps intensity, these alkali Total content (MgO+CaO+SrO+BaO) of soil metal oxide is preferably 10%~30% in configuration example A, more preferably 13%~27%, it is preferably 1%~15%, more preferably 3%~10% in configuration example B, is preferably 5% in configuration example C ~30%, more preferably 10%~20%.

It is hard in order to improve the heat resistance of glass and surface in the glass composition of the glass of the glass plate 12 of present embodiment Degree, ZrO that can be containing less than 10%, preferably less than 5% in configuration example A, B and C₂As optional member.By being adjusted to Less than 10%, glass is not easy devitrification.

In the glass composition of the glass of the glass plate 12 of present embodiment, in order to improve the meltability of glass, forming Can the Fe containing 5~100ppm in example A, B and C₂O₃.It should be noted that Fe₂O₃The preferred scope of amount is as described above.

In addition, the glass of the glass plate 12 of present embodiment can contain the SO as fining agent₃.In this case, SO₃Content represents preferably greater than 0% and less than or equal to 0.5% with quality percentage.More preferably less than 0.4%, it is further excellent Elect less than 0.3%, more preferably less than 0.25% as.

In addition, the glass of the glass plate 12 of present embodiment can contain the Sb as oxidant and fining agent₂O₃、SnO₂ And As₂O₃One or more of.In this case, Sb₂O₃、SnO₂Or As₂O₃Content represented with quality percentage be preferably 0%~0.5%.More preferably less than 0.2%, more preferably less than 0.1%, are further preferably contained substantially no.

But for Sb₂O₃、SnO₂And As₂O₃Oxidant as glass works, can be according to the Fe of regulation glass²⁺ The purpose of amount add within the above range.But from the aspect of environment, preferably contain substantially no As₂O₃。

In addition, the glass of the glass plate 12 of present embodiment can contain NiO.In the case of containing NiO, NiO also makees Worked for coloring components, therefore the total amount that NiO content forms relative to above-mentioned glass is preferably below 10ppm.Particularly, From the viewpoint of the internal transmission rate for never reducing the glass plate under wavelength 400nm~700nm, NiO be preferably 1.0ppm with Under, more preferably below 0.5ppm.

The glass of the glass plate 12 of present embodiment can contain Cr₂O₃.Containing Cr₂O₃In the case of, Cr₂O₃Also serve as Coloring components work, therefore Cr₂O₃The total amount that is formed relative to above-mentioned glass of content be preferably below 10ppm.Particularly, From the viewpoint of the internal transmission rate for never reducing the glass plate under wavelength 400nm~700nm, Cr₂O₃Preferably 1.0ppm with Under, more preferably below 0.5ppm.

The glass of the glass plate 12 of present embodiment can contain MnO₂.Containing MnO₂In the case of, MnO₂Also serve as inhaling The composition for receiving visible ray works, therefore MnO₂The total amount that is formed relative to above-mentioned glass of content be preferably below 50ppm.It is special It is not MnO from the viewpoint of the internal transmission rate for never reducing the glass plate under wavelength 400nm~700nm₂Preferably Below 10ppm.

The glass of the glass plate 12 of present embodiment can contain TiO₂.Containing TiO₂In the case of, TiO₂Also serve as inhaling The composition for receiving visible ray works, therefore TiO₂The total amount that is formed relative to above-mentioned glass of content be preferably below 1000ppm. From the viewpoint of the internal transmission rate for never reducing the glass plate under wavelength 400nm~700nm, TiO₂Content be preferably Below 500ppm, particularly preferably below 100ppm.

The glass of the glass plate 12 of present embodiment can contain CeO₂。CeO₂Redox effect with reduction iron, The Fe relative to total iron can be reduced²⁺The ratio of amount.On the other hand, in order to which the redox suppressed iron drops below 3%, CeO₂The total amount that is formed relative to above-mentioned glass of content be preferably below 1000ppm.In addition, CeO₂Content more preferably For below 500ppm, more preferably below 400ppm, particularly preferably below 300ppm, most preferably below 250ppm.

The glass of the glass plate 12 of present embodiment, which can contain, to be selected from by CoO, V₂O₅In the group formed with CuO at least A kind of composition.In the case of containing these compositions, the composition for also serving as absorbing visible ray works, therefore mentioned component contains Amount is preferably below 10ppm relative to the total amount of above-mentioned glass composition.Particularly, in order to not reduce under wavelength 400nm~700nm Glass plate internal transmission rate, preferably contain substantially no these compositions.

Fig. 3 is the overall perspective view of glass plate 12, and Fig. 4 is the enlarged section of glass plate 12.It should be noted that scheming In 4, the part amplification display in the section of principal plane and light-incident end 28 will be perpendicular to.

Plan view has for the glass plate 12 of rectangle：Light-emitting face 26, light reflection surface 32, light-incident end 28, non-light Incident end face 34,36,38, light incident side fillet surface 40 and non-light incident side fillet surface 42.

Herein, equivalent to the principal plane of present embodiment, light-incident end 28 is suitable for light-emitting face 26 and light reflection surface 32 In the end face of present embodiment.In addition, fillet surface of the light incident side fillet surface 40 equivalent to present embodiment.

Light-emitting face 26 is the face relative with liquid crystal panel 16.In embodiments, light-emitting face 26 is in plan view Shape for rectangle, but light-emitting face 26 is not limited to this.In addition, the size of light-emitting face 26 according to liquid crystal panel 16 and It is determined that therefore be not particularly limited, but using glass plate 12 as in the case of light guide plate, such as 500mm × 500mm Size above is preferable.Glass plate 12 has high rigidity, therefore size is more big more can play its effect.

Light reflection surface 32 is the face relative with light-emitting face 26.The structure in a manner of parallel to light-emitting face 26 of light reflection surface 32 Into.In addition, the shape and size of light reflection surface 32 are formed in a manner of with the identical of light-emitting face 26.

It should be noted that light reflection surface 32 need be not necessarily parallel to light-emitting face 26, it can also use and be provided with height Poor, inclined composition.In addition, the size of light reflection surface 32 can also be set as the size different from light-emitting face 26.

As depicted in figs. 1 and 2, there are multiple circular pip 24A, 24B, 24C on light reflection surface 32.Pip Configuration can be chessboard trellis as shown in Figure 2, or other arbitrary patterns, can also be random, but suitable When being evenly distributed for the brightness for being adjusted so that the light being emitted from light-emitting face 26.Pip 24A~24C utilize by resin with The methods of point-like is printed is formed, and can contain scattering particles or bubble.Although the brightness of the light incident from light-incident end 28 is strong, But its brightness with one side in the inside repeated reflection of glass plate 12 while advance and gradually reduce.

Therefore, in embodiments, from light-incident end 28 towards non-light-incident end 38, pip 24A, 24B, 24C It is of different sizes.Specifically, in the diameter (L of the pip 24A close to the region of light-incident end 28_A) be set to it is smaller, And with thus towards light direct of travel pip 24B diameter (L_B) and pip 24C diameter (L_C) become big mode Set (L_A＜ L_B＜ L_C).The appropriate diameter for adjusting pip is divided with the brightness for the light for be emitted from light-emitting face 26 Cloth is uniform.

Thus, by making pip 24A, 24B, 24C size become towards the direct of travel of the light of the inside of glass plate 12 Change, the brightness uniformity of emergent light being emitted from light-emitting face 26 can be made, and the generation of brightness disproportionation can be suppressed.Need It is bright, by making pip 24A, 24B, 24C number density towards the change in travel direction of the light of the inside of glass plate 12 To replace making pip 24A, 24B, 24C size variation, equal effect can also be obtained.In addition, by light reflection surface Formation makes the groove that the light of incidence reflects to replace pip 24A, 24B, 24C on 32, can also obtain equal effect.

For the non-light-incident end 34,36,38 of glass plate 12, due to the not incident light from light source 18, thus nothing Its surface need to processed in high precision as light-incident end 28, its surface roughness Ra is less than 0.8 μm.But It is to produce brightness disproportionation to suppress to occur to scatter in end face light, the surface roughness Ra of non-light-incident end 34,36,38 Preferably less than 0.4 μm, more preferably less than 0.1 μm.It should be noted that in this manual, it is being recited as surface In the case of roughness Ra, refer to that (center line is averagely thick according to JIS 0601~JIS of B B 0031 arithmetic average roughness Rugosity).

Light-incident end 28 carries out mirror finish in the manufacture of the glass as glass plate 12.In order that come from light source 18 Light be effectively incident to the inside of glass plate 12, the surface roughness Ra of light-incident end 28 is less than 0.1 μm, preferably small In 0.03 μm, more preferably less than 0.001 μm, particularly preferably less than 0.0005 μm.Therefore, it is incident to from light source 18 The incident efficiency of the light of the inside of glass plate 12 improves.From improve production efficiency from the viewpoint of, non-light-incident end 34,36, 38 surface roughness Ra can surface identical with the surface roughness Ra of light-incident end 28 or more than light-incident end 28 Roughness Ra.

There is light between light-emitting face 26 and light-incident end 28 and between light reflection surface 32 and light-incident end 28 Light incident side fillet surface 40.That is, between light-emitting face 26 and light-incident end 28, have and light-emitting face 26 and light incident side The light incident side fillet surface 40 that face 28 abuts.Similarly, between light reflection surface 32 and light-incident end 28, have anti-with light Penetrate the light incident side fillet surface 40 of face 32 and the adjoining of light-incident end 28.

In embodiments, enter exemplified between light-emitting face 26 and light-incident end 28, in light reflection surface 32 and light Penetrating this two side between end face 28 has the mode of light incident side fillet surface 40, but can also use only has light incident in a side The composition of side fillet surface 40.In addition, the surface roughness Ra of light incident side fillet surface 40 is preferably less than 0.8 μm, more preferably Less than 0.4 μm, more preferably less than 0.1 μm.By the way that the surface roughness Ra of light incident side fillet surface 40 is adjusted into 0.8 Below μm, it can suppress to produce the brightness disproportionation for the light being emitted from glass plate 12.Consider from other viewpoints, by by light incident side The surface roughness Ra of fillet surface 40 is adjusted to less than 0.8 μm, and light that can be effectively by incidence is introduced to glass plate 12.Separately Outside, by the way that the surface roughness Ra of light incident side fillet surface 40 is adjusted into less than 0.4 μm, cullet yield can be suppressed. On the other hand, the lower limit of the surface roughness Ra of light incident side fillet surface 40 does not limit, and Ra is smaller, can more suppress glass The generation of the brightness disproportionation of plate 12, but so need to spend the time in chamfering process described later (S12).Imitated from production is improved From the viewpoint of rate, the surface roughness Ra of light incident side fillet surface 40 is preferably greater than the surface roughness of light-incident end 28 Ra.Herein, the surface roughness Ra of each non-light incident side fillet surface 42 of non-light-incident end 34,36,38 be preferably 0.8 μm with Under.Thus, when setting the zone of reflections in non-light-incident end and/or non-light incident side fillet surface, once from non-light-incident end , then can be from non-light incident side fillet surface effectively again and/or the light that non-light incident side fillet surface is spilt is reflected by the zone of reflections It is incident.

It should be noted that shape and effect, effect for light incident side fillet surface 40, in glass plate 12 described later Feature one illustrates in column.

In the sheet light emitting apparatus 14 that slimming is required as embodiment, it is also necessary to become the thickness of glass plate 12 It is thin.Therefore, the thickness of the glass plate 12 of embodiment is 0.7mm~3.0mm.By the thickness of glass plate 12 for 3.0mm with Under, sheet light emitting apparatus 14 can be made thinning, by the way that for more than 0.7mm, enough rigidity can be obtained.It should be noted that The thickness of glass plate 12 is not limited to the value, even if being the thickness, with the acrylic resin with more than thickness 4mm The sheet light emitting apparatus of light guide plate is compared, and can also provide the sheet light emitting apparatus 14 with sufficient intensity.

[manufacture method of glass plate 12]

Fig. 5, Fig. 6, Fig. 7 are for the figure for the manufacture method for illustrating glass plate 12.Fig. 5 is the manufacturer for representing glass plate 12 The process chart of method.Fig. 6 is the plan of glass blank 44, and Fig. 7 is the plan of glass baseplate 46.

In order to manufacture glass plate 12, prepare Fig. 6 glass blank 44 first.The thickness of glass blank 44 be 0.7mm~ Average internal transmissivity when 3.0mm, length 50mm, under wavelength 400nm~700nm is more than 90%.Glass blank 44 is set It is set to the shape bigger than the original shape of glass plate 12.

＜ cutting actions ＞

Cutting action as the step of Fig. 5 shown in (S) 10 is implemented first to glass blank 44.In cutting action (S10), Using each position shown in dotted line of the topping machanism in Fig. 6, (at 1 non-light incident side surface side at the position of light incident side surface side and 3 Position) implement cutting processing.It should be noted that cutting processing may not necessarily be real to the position of non-light incident side surface side at 3 Apply, can be only pair relative with the position of light incident side surface side at 11 at the position of non-light incident side surface side carry out cutting processing.

By implementing cutting processing, Fig. 7 glass baseplate 46 is cut out from Fig. 6 glass blank 44.It should be noted that In embodiments, glass plate 12 is rectangle in plan view, therefore non-for the position and 3 of 1 light incident side surface side Cutting processing is implemented in the position of light incident side surface side, and cutting position suitably selects according to the shape of glass plate 12.

It should be noted that the cutting method as glass blank 44, it is possible to implement such as：Line patterning method, laser are cut Cut method etc..The preferred line patterning method from the viewpoint of productivity ratio.In addition, light incident side fillet surface 40 is being formed as into circular arc In the case of, cut surface can be preferably formed as to the laser cutting method of circular arc.

The chamfering process ＞ of ＜ the 1st

As shown in figure 5, at the end of cutting action (S10), implement the 1st chamfering process (S12).In the 1st chamfering process (S12) in, using grinding attachment, enter between light-emitting face 26 and non-light-incident end 38 and in light reflection surface 32 and non-light This two side forms non-light incident side fillet surface 42 respectively between penetrating end face 38.

It should be noted that between light-emitting face 26 and non-light-incident end 34, it is incident in light reflection surface 32 and non-light Between end face 34, between light-emitting face 26 and non-light-incident end 36 and in light reflection surface 32 and non-light-incident end 36 Between in the case that whole or any one place forms non-light incident side fillet surface 42, implement in the 1st chamfering process (S12) Chamfer machining.

In addition, from the viewpoint of productivity ratio, in the 1st chamfering process (S12), preferred pair light-emitting face 26 and light are incident Chamfer machining is carried out between end face 28 or between light reflection surface 32 and light-incident end 28.In this case, from productivity ratio Viewpoint considers, it is preferred that the surface roughness Ra of obtained light incident side fillet surface 40 ' (not shown) is more than described later the The surface roughness Ra of the light incident side fillet surface 40 obtained in 2 chamfering process.Thus, light incident side fillet surface 40 ' is formed, In the stage, connect P1 and P2 described later it is line segment L, be not particularly limited relative to the tilt angle theta of light-incident end 28.

In the 1st chamfering process (S12), also implement grinding processing or milled processed to non-light-incident end 34,36,38. Non- light incident side fillet surface can formed by implementing the period of grinding processing or milled processed to non-light-incident end 34,36,38 42 leading portion can also section behind, can also carry out simultaneously.It should be noted that for non-light-incident end 34,36, Face after implementation cutting processing is used directly as non-light-incident end 34,36.

From the viewpoint of productivity ratio, in the 1st chamfering process (S12), preferred pair light-incident end 28 also implements grinding Processing or milled processed.The period for implementing grinding processing or milled processed to light-incident end 28 can fall forming light incident side The leading portion of edged surface 42 can also section behind, can also carry out simultaneously.

1st chamfering process (S12) can be with mirror finish process (S14) described later and the 2nd chamfering process (S16) simultaneously Carry out or carried out in their back segment, it is preferred that being carried out in their leading portion.Thus, it is possible in the 1st chamfering process (S12) In with than faster speed implement corresponding to glass plate 12 shape processing, therefore productivity ratio improve.

＜ mirror finish processes ＞

At the end of the 1st chamfering process (S12), then implement mirror finish process (S14).In mirror finish process (S14) in, mirror finish is implemented to the light-incident end 28 of the glass baseplate 46 shown in Fig. 7, is consequently formed surface roughness Ra For less than 0.1 μm of light-incident end 28.

The chamfering process ＞ of ＜ the 2nd

After light-incident end 28 is formed on glass baseplate 46 using mirror finish process (S14), then implement the 2nd Chamfering process (S16), between light-emitting face 26 and light-incident end 28 and between light reflection surface 32 and light-incident end 28 Carry out being ground processing or milled processed.Thus, light incident side fillet surface 40 is formed.For the light incident side fillet surface being consequently formed For 40, P1 and P2 described later tilt angle theta 0.01≤tan of satisfaction θ line segment L, relative to light-incident end 28 are connected ≤0.75.Thus, it is possible to suppress the light loss of light source 18.It should be noted that the 2nd chamfering process (S16) can be relative Implement in the leading portion of mirror finish process (S14), alternatively, it is also possible to implement with mirror finish process (S14) simultaneously.

When forming light incident side fillet surface 40, as the instrument for implementing grinding processing or milled processed, mill can be used Stone, in addition, in addition to grinding stone, the polishing wheel comprising cloth, skin, rubber etc. or brush etc. can also be used, at this point it is possible to use The grinding agents such as cerium oxide, aluminum oxide, carborundum, cataloid.Wherein, from the viewpoint of dimensional stability, as mill Tool, preferably using grinding stone.

By each operation shown in S10~S16 Jing Guo the above, glass plate 12 is manufactured.It should be noted that in manufacture glass After glass plate 12, formation pip 24A, 24B, 24C the methods of printing is being utilized on light reflection surface 32.

[feature of glass plate 12 and sheet light emitting apparatus 14]

As shown in figure 1, the glass plate 12 as sheet light emitting apparatus 14, in order to effectively utilize the light quantity of light source 18, it is desirable to Make the light that the inside of glass plate 12 is incident to from light-incident end 28, in glass plate in the state of pip 24A~C is not provided with 12 inner surface repeats total reflection while advancing without light leak to outside.

But for the glass plate of the fillet surface with normally shape disclosed in patent document 3, enter from fillet surface The problem of being incident upon the light of the inside of glass plate and significantly bent direct of travel due to refraction, therefore existing be, light leak is to outer Portion in glass plate without carrying out guided wave.Confirm that also mostly occur such light leakage phenomena for position near light-incident end. That is, for conventional glass plate, in the absence of can be effectively using the light quantity of light source without the glass that loses Plate.

Therefore, in the present embodiment, there is provided can effectively using light source 18 light quantity sheet light emitting apparatus 14 and can Using the glass plate 12 used in sheet light emitting apparatus 14 as light guide plate.

Then, illustrated according to Fig. 4.Fig. 4 is the explanation figure for the feature that amplification shows glass plate 12, and it is perpendicular to work The sectional view of light-emitting face 26 and light reflection surface 32 for principal plane and the light-incident end 28 as end face.

In this repeat specification, glass plate 12 has light-emitting face 26 and light reflection surface 32, and with perpendicular to light-emitting face 26 and the light-incident end 28 of light reflection surface 32.In addition, with incident with the light of light-emitting face 26 and the adjoining of light-incident end 28 Side fillet surface 40, there is the light incident side fillet surface 40 abutted with light reflection surface 32 and light-incident end 28.

Moreover, in the section of light-emitting face 26 and light-incident end 28, when by light incident side fillet surface 40 with The point that light-emitting face 26 intersects is set to the 1st crosspoint P1, and light incident side fillet surface 40 and the point that light-incident end 28 intersects are set For the 2nd crosspoint P2 when, connection P1 and P2 it is line segment L, relative to light-incident end 28 tilt angle theta meet 0.01≤ tanθ≤0.75.It should be noted that the light incident side fillet surface 40 of the side of light reflection surface 32 is also same composition, therefore omit The explanation of the light incident side fillet surface 40 of the side of light reflection surface 32.

Present inventor have extensively studied the light incident side for the light quantity that light source 18 can be effectively utilized as glass plate 12 The shape of fillet surface 40, it was found that, can also be by the light quantity of light source 18 even the glass plate with light incident side fillet surface 40 Loss is suppressed to minimal glass plate 12.

I.e., there is provided as shown in Figure 4, in the section of light-emitting face 26 and light-incident end 28, connecting light incidence The 1st crosspoint P1 and light incident side fillet surface 40 that side fillet surface 40 intersects with light-emitting face 26 intersect with light-incident end 28 The 2nd crosspoint P2 line segment L tilt angle theta relative to light-incident end 28 meet the glass of 0.01≤tan θ≤0.75 Glass plate.

In addition, present inventor is found that another embodiment for the light loss that can further suppress light source 18 Glass plate.

Figure 13 is the amplifier section sectional view of the glass plate 112 in another embodiment.As shown in figure 13, glass plate 112 With light incident side fillet surface 140, the light incident side fillet surface 140 meets following condition：Perpendicular to the He of light-emitting face 126 In the section of light-incident end 128, the 1st crosspoint P11 that connection light incident side fillet surface 140 intersects with light-emitting face 126 and The line segment L11 for the 2nd crosspoint P12 that light incident side fillet surface 140 intersects with inclined plane 148 has relative to light-incident end 128 There is tilt angle theta₁.Tilt angle theta₁Meet 0.01≤tan θ₁≤ 0.75。

In addition, glass plate 112 has inclined plane 148, the inclined plane 148 meets following condition：Perpendicular to light-emitting face 126 and light-incident end 128 section in, connect what the 2nd crosspoint P12 and inclined plane 148 were intersected with light-incident end 128 The 3rd crosspoint P13 line segment L12 tilt angle theta relative to light-incident end 128₂Less than tilt angle theta₁, and meet 0 ＜ tan θ₂≤0.4.That is, tilt angle theta₁Meet tan θ₁＞ tan θ₂。

In the glass plate 112 shown in the glass plate 12 and Figure 13 shown in Fig. 4, from the light incident side chamfering of such shape Inner surface and light of the light of the incident light source 18 in face (40,140) in the light-emitting face of glass plate 12 or glass plate 112 (26,126) While repeating to be totally reflected on the inner surface of reflecting surface (32,132), while being advanced in the inside of glass plate 12 or glass plate 112. Thus, according to these embodiments, can provide can effectively using light source 18 light quantity glass plate 12 or the He of glass plate 112 Sheet light emitting apparatus 14.

It should be noted that in fig. 4 it is shown that cross sectional shape is linear light incident side fillet surface 40, but Cross sectional shape comprising light incident side fillet surface 40 is the situation of arc-shaped.In this case, as Fig. 8 glass plate 12 master Want shown in the amplification view of position, light incidence in the section of light-emitting face 26 and light-incident end 28, will formed The tangent line T of the above-mentioned circular arc at point conduct point P3, point P3 on the circular arc that the circular arc of side fillet surface 40 is equably halved phase Meet 0.01≤tan θ≤0.75 for the tilt angle theta of light-incident end 28.In the glass plate 112 shown in Figure 13, also wrap Fillet surface containing light incident side 140 and the glass plate that the cross sectional shape of inclined plane 148 is arc-shaped.

In the glass plate 12 shown in Fig. 4, if above-mentioned tan θ are more than 0.01, chamfered section will not become extremely mistake It is small, it is possible to achieve to remove the edge of glass plate 12 and improve the initial purpose of intensity.If above-mentioned tan θ are less than 0.75, from The light leak of glass plate 12 tails off, and in the case where glass plate 12 is used as light guide plate, brightness uprises.In order to further reduce Light leak, above-mentioned θ is preferred to meet 0.01≤tan θ≤0.5, more preferably meets 0.01≤tan θ≤0.4, further preferably to meet 0.01≤tan θ≤0.3, particularly preferably meet 0.01≤tan θ≤0.2.Particularly meet 0.01≤tan θ≤0.2 in above-mentioned θ In the case of, light leak can be completely eliminated.

In the glass plate 112 shown in Figure 13, if above-mentioned tan θ₁For more than 0.01, then chamfered section will not become extreme It is too small, it is possible to achieve to remove the edge of glass plate 12 and improve the initial purpose of intensity.If above-mentioned tan θ₁For less than 0.75, Then tailed off from the light leak of glass plate 112, in the case where glass plate 112 is used as light guide plate, brightness uprises.In order to enter one Step reduces light leak, above-mentioned θ₁It is preferred that meet 0.01≤tan θ₁≤ 0.5, more preferably meet 0.01≤tan θ₁≤ 0.4, it is further excellent Be full 0.01≤tan of foot θ₁≤ 0.3, particularly preferably meet 0.01≤tan θ₁≤0.2.Particularly in above-mentioned θ₁Satisfaction 0.01≤ tanθ₁In the case of≤0.2, light leak can be completely eliminated.

For in general chamfer shape, above-mentioned θ is 45 °, tan θ or tan θ₁For 1, but in this case, from When light incident side fillet surface (40,140) is incident to glass plate 12 or glass plate 112, the traveling mode of light is due to refraction and big Width is bent.The light that direct of travel is significantly bent easily is spilt without in glass plate 12 or glass from glass plate 12 or glass plate 112 Guided wave is carried out in glass plate 112.Present inventor has found, by by tan θ or tan θ₁Less than 0.75 is adjusted to, can be suppressed The influence of refraction, it as a result can reduce light leak.

In addition, embodiment glass plate 12 or glass plate 112 light incident side fillet surface (40,140) rough surface It is preferably less than 0.1 μm to spend Ra.Thus, light from light source 18 be incident to the inside of glass plate 12 or glass plate 112 without Scattering or diffusing reflection can occur in light incident side fillet surface (40,140).Thus, it is possible to further effectively utilize light source 18 Light.

In addition, for the glass plate 12 or glass plate 112 of embodiment, during preferred length 50mm, wavelength Average internal transmissivity under 400nm~700nm is more than 90%, therefore as internal transmission rate high glass plate 12 or glass Plate 112.Thus, it is possible to further effectively utilize the light of light source 18.

[embodiment]

Present inventor uses ray tracking soft (Light during above-mentioned tan θ scope is found Tools：CYBERNET SYSTEM company systems), simulated with the light radical of 1,000,000.In the model for this simulation In, vacate 0.5mm from light-incident end 28 in a manner of the glass plate 12 of the rectangle of the size with 700mm × 700mm is relative Distance configuration light source 18, reflector 30 is configured in a manner of ambient light source 18.In addition, glass plate 12 has fillet surface 40, its Inclination angle and size are as described later, are simulated by carrying out various change.Light source 18 includes multiple spot lights arranged side by side, Lighted in the range of wavelength 400nm~700nm, there is lambert's light distribution characteristic.It is special that there is reflector 30 Gauss of σ=15 ° to reflect Property, and scattered reflection rate is 98%.Glass plate 12 has light-emitting face 26 and light reflection surface 32, is not formed on light reflection surface 32 Pip.In addition, the distance for vacating 0.1mm from light reflection surface 32 in a manner of relative with glass plate 12 is provided with reflector plate 20.Reflector plate has the Gauss reflection characteristic of σ=15 °, and scattered reflection rate is 98%.

In order to more correctly estimate the amount of the amount of non-guided wave and guided wave, in this model, it is assumed that without the suction of glass Receive.For the refractive index of glass, to be set under wavelength 435.8nm for 1.532, under wavelength 486.1nm be 1.527, For 1.523, under wavelength 587.6nm it is 1.521 under wavelength 546.1nm, under wavelength 656.3nm is 1.519, using to these Value value obtained from appropriate Sellmeier (Sellmeier) coefficient enters row interpolation.

Fig. 9 is by ratio (%) use relative to multiple tan θ non-guided wave in the glass plate 12 that thickness t is 1.7mm Solid rhombus (Solid rhombus：◆), solid square (Solid square：■), solid triangle (Solid triangle：▲) mark drawn obtained from figure.Figure 10 is the non-guided wave for representing to be used for calculate Fig. 9 by simulation The table of the condition of the ratio (%) of light and the result of simulation.

In addition, Figure 11 is by relative to the ratio of the non-guided wave of multiple tan θ values in the glass plate 12 that thickness t is 2.5mm Solid rhombus (the Solid rhombus of example (%)：◆), solid square (Solid square：■), solid triangle Shape (Solid triangle：▲) mark drawn obtained from figure.Figure 12 is used to calculate figure by simulation for expression The table of the condition of the ratio (%) of 11 non-guided wave and the result of simulation.

A refers to, as shown in figure 4, the 1st extended line La that will extend along light-emitting face 26 with along light-incident end 28 the 2nd extended line Lb extended intersect o'clock as the 3rd crosspoint P3 when, from the 1st crosspoint P1 untill the 3rd crosspoint P3 Length.In addition, b refers to the length untill the 3rd crosspoint P3 from the 2nd crosspoint P2.That is, the spy of present embodiment Sign is that a/b=tan θ, a/b value are less than 0.75.

In addition, the light for referring to spill from light-emitting face 26 in glass plate 12 in the non-guided wave described in Figure 10, Figure 12 Total amount, the ratio of light leak amount when non-guided wave (%) represents the light quantity of light source 18 being set to 100%, in the test point Example.

In addition, guided wave refers to carry out total reflection in the inside of glass plate 12 while the light advanced, guided wave (%) Represent when the light quantity of light source 18 is set into 100%, be spaced 690mm's from light-incident end 28 towards non-light-incident end 38 The ratio for the light quantity that opening position detects.It should be noted that the aggregate value of guided wave (%) and non-guided wave (%) is not up to 100% the reasons why, is that light is absorbed by reflector 30 or reflector plate 20.

According to Fig. 9, Figure 11, to b is set as into 0.1mm, by a be set as 0.01mm, 0.02mm, 0.03mm, 0.05mm, Solid rhombus (the Solid rhombus of non-guided wave (%) in the case of 0.07mm, 0.1mm：◆) mark carries out respectively Draw.Similarly, to b is set as into 0.2mm, by a be set as 0.01mm, 0.03mm, 0.05mm, 0.1mm, 0.15mm, Solid square (the Solid square of non-guided wave (%) in the case of 0.2mm：■) mark is drawn respectively. Similarly, to b is set as into 0.3mm, a is set as to 0.01mm, 0.03mm, 0.05mm, 0.1mm, 0.2mm, 0.3mm feelings Solid triangle (the Solid triangle of non-guided wave (%) under condition：▲) mark drawn respectively.

Herein, compared with when tan θ are 1, metewand, such as Fig. 9, Figure 10 are used as if reduced using non-guided wave (%) It is shown,, can be with if a/b values are less than 0.75 (tan θ≤0.75) in the case where thickness t is 1.7mm glass plate 12 Meet metewand.In addition we know, if a/b values are less than 0.2 (tan θ≤0.2), non-guided wave (%) is 0.Need It is bright, also indicate that to meet the metewand, preferably a is 0.01mm~0.05mm, and b is 0.1mm~0.3mm.

In addition, as shown in Figure 11, Figure 12, in the case where thickness t is 2.5mm glass plate 12, if a/b values are 0.75 (tan θ≤0.75) below, then can also meet metewand.In addition we know, if a/b values are less than 0.2 (tan θ≤0.2), Then non-guided wave (%) is 0.It follows that tan θ preferred scope is not rely on the thickness of glass plate 12.Need what is illustrated It is also to indicate that to meet the metewand, preferably a is 0.01mm~0.05mm, and B is 0.1mm~0.3mm.

Therefore, according to the glass plate 12 that a/b values are less than 0.75 (tan θ≤0.75), no matter the thickness of glass plate 12 is such as What, can effectively utilize the light quantity of light source 18.Therefore, according to the sheet light emitting apparatus 14 of the glass plate 12 with embodiment, The slimming of electronic equipment can be realized and power consumption can be cut down.

More than, it is described in detail for the preferred embodiment of the present invention, but the present invention is not limited to Specific embodiment is stated, in the range of the idea of the invention that claims are recorded, various modifications can be carried out, become More.

This international application requirement based on the Japanese patent application 2015-148561 proposed on July 28th, 2015 and The priority for the Japanese patent application 2015-219370 that on November 9th, 2015 proposes, entire contents are quoted so far.

Reference

10 ... liquid crystal display devices, 12,112 ... glass plates, 14 ... sheet light emitting apparatus, 16 ... liquid crystal panels, 18 ... light Source, 20 ... reflector plates, 22 ... various optical sheets, 24A, 24B, 24C ... pip, 26,126 ... light-emitting faces, 28,128 ... light Incident end face, 30 ... reflectors, 32,132 ... light reflection surfaces, 34,36,38 ... non-light-incident end, 40,140 ... light are incident Side fillet surface, 42 ... non-light incident side fillet surfaces, 44 ... glass blanks, 46 ... glass baseplates.

Claims

1. a kind of glass light guide plate, it has principal plane and perpendicular to the end face of the principal plane, and in the principal plane and institute The fillet surface possessed between end face with the principal plane and the end surfaces is stated, wherein,

In the section of the principal plane and the end face, the fillet surface intersects with the principal plane the 1st is being connected The angle of inclination relative to the end face of the line segment in the 2nd crosspoint that crosspoint and the fillet surface intersect with the end face θ meets 0.01≤tan θ≤0.75.

2. glass light guide plate as claimed in claim 1, wherein, the tilt angle theta meets 0.01≤tan θ≤0.5.

3. glass light guide plate as claimed in claim 1, wherein, the tilt angle theta meets 0.01≤tan θ≤0.4.

4. glass light guide plate as claimed in claim 1, wherein, the tilt angle theta meets 0.01≤tan θ≤0.3.

5. glass light guide plate as claimed in claim 1, wherein, the tilt angle theta meets 0.01≤tan θ≤0.2.

6. a kind of glass light guide plate, it has principal plane and perpendicular to the end face of the principal plane, in the principal plane and described Possesses the inclination between the fillet surface and the end face with the fillet surface and configuration of principal plane adjoining between end face Face, wherein,

In the section of the principal plane and the end face,

Intersected with connecting the 1st crosspoint that the fillet surface intersects with the principal plane and the fillet surface with the inclined plane The 2nd crosspoint line segment relative to the end face with tilt angle theta₁Inclined mode possesses the fillet surface,

The tilt angle theta₁Meet 0.01≤tan θ₁≤ 0.75,

Connect the 2nd crosspoint and the line segment in the 3rd crosspoint that the inclined plane is intersected with the end face relative to institute State the tilt angle theta of end face₂Less than the tilt angle theta₁And meet 0 ＜ tan θ₂≤0.4。

7. glass light guide plate as claimed in claim 6, wherein, the tilt angle theta₁Meet 0.01≤tan θ₁≤0.5。

8. glass light guide plate as claimed in claim 6, wherein, the tilt angle theta₁Meet 0.01≤tan θ₁≤0.4。

9. glass light guide plate as claimed in claim 6, wherein, the tilt angle theta₁Meet 0.01≤tan θ₁≤0.3。

10. glass light guide plate as claimed in claim 6, wherein, the tilt angle theta₁Meet 0.01≤tan θ₁≤0.2。

11. such as glass light guide plate according to any one of claims 1 to 10, wherein, the surface roughness Ra of the end face is Less than 0.1 μm.

12. such as glass light guide plate according to any one of claims 1 to 10, wherein, the surface roughness Ra of the end face is Less than 0.03 μm.

13. such as glass light guide plate according to any one of claims 1 to 10, wherein, the surface roughness Ra of the end face is Less than 0.001 μm.

14. such as glass light guide plate according to any one of claims 1 to 10, wherein, the surface roughness Ra of the end face is Less than 0.0005 μm.

15. such as glass light guide plate according to any one of claims 1 to 10, wherein, the length 50mm of the glass light guide plate When, average internal transmissivity under wavelength 400nm~700nm be more than 90%.

16. glass light guide plate as claimed in claim 11, wherein, during the length 50mm of the glass light guide plate, wavelength Average internal transmissivity under 400nm~700nm is more than 90%.

17. such as glass light guide plate according to any one of claims 1 to 10, wherein,

The thickness of the glass light guide plate is 0.7mm~3.0mm,

Using along the point that the 1st extended line that the principal plane extends intersects with the 2nd extended line extended along the end face as 3rd crosspoint,

It is 0.01mm~0.05mm from length of the 1st crosspoint untill the 3rd crosspoint,

It is 0.1mm~0.3mm from length of the 2nd crosspoint untill the 3rd crosspoint.

18. glass light guide plate as claimed in claim 11, wherein,

The thickness of the glass light guide plate is 0.7mm~3.0mm,

It is 0.1mm~0.3mm from length of the 2nd crosspoint untill the 3rd crosspoint.

19. glass light guide plate as claimed in claim 15, wherein,

The thickness of the glass light guide plate is 0.7mm~3.0mm,

It is 0.1mm~0.3mm from length of the 2nd crosspoint untill the 3rd crosspoint.

20. such as glass light guide plate according to any one of claims 1 to 10, it is characterised in that the rough surface of the end face Spend Ra value of the value less than the surface roughness Ra of the fillet surface.

21. glass light guide plate as claimed in claim 11, it is characterised in that the value of the surface roughness Ra of the end face is less than The value of the surface roughness Ra of the fillet surface.

22. glass light guide plate as claimed in claim 15, it is characterised in that the value of the surface roughness Ra of the end face is less than The value of the surface roughness Ra of the fillet surface.

23. glass light guide plate as claimed in claim 17, it is characterised in that the value of the surface roughness Ra of the end face is less than The value of the surface roughness Ra of the fillet surface.

24. such as glass light guide plate according to any one of claims 1 to 10, wherein, the surface roughness Ra of the fillet surface For less than 0.8 μm.

25. glass light guide plate as claimed in claim 11, wherein, the surface roughness Ra of the fillet surface is less than 0.8 μm.

26. glass light guide plate as claimed in claim 15, wherein, the surface roughness Ra of the fillet surface is less than 0.8 μm.

27. glass light guide plate as claimed in claim 17, wherein, the surface roughness Ra of the fillet surface is less than 0.8 μm.

28. glass light guide plate as claimed in claim 20, wherein, the surface roughness Ra of the fillet surface is less than 0.8 μm.

29. such as glass light guide plate according to any one of claims 1 to 10, it is used for sheet light emitting apparatus.

30. glass light guide plate as claimed in claim 11, it is used for sheet light emitting apparatus.

31. glass light guide plate as claimed in claim 15, it is used for sheet light emitting apparatus.

32. glass light guide plate as claimed in claim 17, it is used for sheet light emitting apparatus.

33. glass light guide plate as claimed in claim 20, it is used for sheet light emitting apparatus.

34. such as glass light guide plate according to any one of claims 1 to 10, wherein, as relative with the principal plane Formed with pip on the secondary principal plane in face.

35. glass light guide plate as claimed in claim 11, wherein, it is flat in the second master as the face relative with the principal plane Formed with pip on face.