CN103154780A - Optical sheet - Google Patents
Optical sheet Download PDFInfo
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- CN103154780A CN103154780A CN2011800486989A CN201180048698A CN103154780A CN 103154780 A CN103154780 A CN 103154780A CN 2011800486989 A CN2011800486989 A CN 2011800486989A CN 201180048698 A CN201180048698 A CN 201180048698A CN 103154780 A CN103154780 A CN 103154780A
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- Prior art keywords
- optical element
- optical
- element face
- diffusion layer
- light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
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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
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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
Abstract
Provided is an optical sheet which has the desired optical characteristics, makes it possible to reduce the number of optical sheets used in an optical module, and makes it possible to reduce optical loss. An optical sheet (11) according to an embodiment of the present invention, for example, comprises first and second surfaces (12 and 13) and at least two layers, wherein the optical sheet (11) is characterized in that at least one of the surfaces (12 or 13) or boundary surfaces (14a or 15a) is an optical element surface, and at least one layer is a light diffusion layer (17a or 17b).
Description
Technical field
The present invention relates to the optical sheet for optical module.
More specifically, relate to be used to the optical characteristics that makes the direction of light sent from the light source take cold-cathode tube, LED, organic or inorganic EL (electroluminescence) luminophor as the light emitting module of representative or homogeneity of Luminance Distribution etc. and become desirable optical characteristics and have optical sheet take display or lamp decoration signboard as the various optical modules of the information display section of representative.
Further more specifically, relate to the optical sheet with at least one optical element face and light diffusion layer for optical module.
Background technology
All the time, in optical module, known to have the homogeneity that will make the direction of light sent from light source or Luminance Distribution to become desirable optical characteristics be purpose, and use respectively optical sheet, for example have layer and the light diffusion layer of optical element face.
For example, the layer (prismatic lens (prism sheet)) that has proposed to have two optical element faces is used for planar light source device (optical module), and the direction of the crest line of the angle of the prism vertex angle by stipulating these prismatic lenses or prism makes the area source high brightness.And, proposed by light diffusion layer (light diffusing sheet) and prismatic lens are used for the homogenising (for example, with reference to patent documentation 1) that this optical module is realized Luminance Distribution overlappingly.
Yet, the overlapping body of the optical sheet that proposes in above-mentioned patent, that combination has thin slice with optical element face and the overlapping body of light diffusing sheet, because the optical loss that is caused by the Optical Absorption in each thin slice of light transmission is arranged, so when the assembling of optical module, the brightness of information display section diminishes.In addition, be difficult to realize the slimming of optical module.Have again, in the leeway that is improved aspect the homogeneity of the direction of light of sending from light source or Luminance Distribution.
In the prior art, for example in order to reduce optical loss, in the situation that the thin slice attenuation of using, it is difficult that the masking of thin slice becomes, and in addition, the inequality of the optical characteristics that the impact due to uneven thickness causes occurs easily.Have, in the situation that use overlappingly thin thin slice, when the assembling of optical module, it is difficult that operation becomes again.
The prior art document
Patent documentation
Patent documentation 1: Japanese kokai publication hei 8-271894 communique
Summary of the invention
Invent problem to be solved
Problem to be solved by this invention is at the optical sheet that is used for optical module, make the direction of light sent from light source or Luminance Distribution homogeneity, be that light diffusing easily becomes desirable optical characteristics, and, cut down the quantity of the optical sheet that is used for optical module and reduce optical loss.Other problem of the present invention is the optical sheet of the application of the invention, realizes the slimming of optical module and easily realizes the assembling of optical module.
Solve the technological means of problem
The present invention who completes in order to reach above-mentioned problem is a kind of optical sheet, it is characterized in that, at the optical sheet by first and second at least two layers that the surface consists of and has, at least one surface or interface are the optical element face, and at least one layer is light diffusion layer.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, described light diffusion layer has described optical element face.
In addition, in other mode of the present invention, at least one party on described the first and second surfaces has described optical element face.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, at least one party on described the first and second surfaces has described optical element face, and described light diffusion layer has described optical element face.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that having plural described optical element face.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, the both sides on described the first and second surfaces have described optical element face.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, comprises the described light diffusion layer and the light transmission layer that have as the described first surface of described optical element face.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, comprise the first light diffusion layer of having as the described first surface of the first optical element face, have as the second light diffusion layer of the described second surface of the second optical element face identical or different from described the first optical element face and be held on described the first light diffusion layer and described the second light diffusion layer between the light transmission layer.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, at least one party at the interface of described the first light diffusion layer and described light transmission layer and the interface of described the second light diffusion layer and described light transmission layer as with described the first optical element face and described the second optical element face in a side identical or with both sides different the 3rd optical element face and having.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, described the first optical element face, described the second optical element face and described the 3rd optical element face are parallel to each other identical shaped.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, the refractive index of described the first light diffusion layer and described the second light diffusion layer is different from the refractive index of described light transmission layer.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, the refractive index of described the first light diffusion layer and described the second light diffusion layer is greater than the refractive index of described light transmission layer.
in addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, comprise the first light transmission layer that has as the described first surface of the first optical element face, described light diffusion layer and the second light transmission layer, described the first light transmission layer has as the identical or different from described the first optical element face second optical element face and interface described light diffusion layer, described the second light transmission layer have as from described the first optical element face and described the second optical element face in a side identical or with both sides the different the 3rd optical element face and interface described light diffusion layer.
in addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, comprise the first light transmission layer that has as the described first surface of the first optical element face, described light diffusion layer, has the second light transmission layer as the described second surface of the second optical element face identical or different from described the first optical element face, described the first light transmission layer have as identical from any one party of described the first optical element face and described the second optical element face or with equal the different the 3rd optical element face and the interfaces described light diffusion layer of described the first optical element face and described the second optical element face, described the second light transmission layer have as from described the first optical element face any one party to described the 3rd optical element face identical or with described the first optical element face to equal the different the 4th optical element face and the interfaces described light diffusion layer of described the 3rd optical element face.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, described the first optical element face, described the second optical element face, described the 3rd optical element face and described the 4th optical element face are parallel to each other identical shaped.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, the refractive index of described the first light transmission layer and described the second light transmission layer is different respectively from the refractive index of described light diffusion layer.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, the refractive index of described the first light transmission layer and described the second light transmission layer is greater than the refractive index of described light diffusion layer.
In addition, other mode of the present invention is a kind of optical sheet, it is characterized in that, described the second light transmission layer is made of a plurality of layers of institute, the refractive index of described a plurality of layers, and the layer in the outside is higher.
The effect of invention
According to the present invention, thereby can make the direction of light sent from light source or the homogeneity of Luminance Distribution become desirable optical characteristics by optical sheet being applied to optical module, and, can cut down for the quantity of the optical sheet of optical module and can reduce optical loss, wherein, this optical sheet is characterised in that, consisted of by the first and second surfaces, have at least two layers, at least one surface or interface are the optical element face, and at least one layer is light diffusion layer.Have again, can realize the slimming of optical module and can easily implement assembling to optical module.
Description of drawings
Fig. 1 is the partial cross section figure of the overlapping body of optical sheet of prior art.
Fig. 2 is the partial cross section figure of the first embodiment of the present invention.
Fig. 3 is the partial cross section figure of the second embodiment of the present invention.
Fig. 4 is the partial cross section figure of the 3rd embodiment of the present invention.
Fig. 5 is the partial cross section figure of the 4th embodiment of the present invention.
Fig. 6 is the partial cross section figure of the 5th embodiment of the present invention.
Fig. 7 is the partial cross section figure of the 6th embodiment of the present invention.
Fig. 8 is the partial cross section figure of the 7th embodiment of the present invention.
Fig. 9 is the partial cross section figure of the 8th embodiment of the present invention.
Figure 10 is the partial cross section figure of the 9th embodiment of the present invention.
Figure 11 is the partial cross section figure of the tenth embodiment of the present invention.
Figure 12 is the partial cross section figure of the 11 embodiment of the present invention.
Figure 13 is the partial cross section figure of the 12 embodiment of the present invention.
Figure 14 is the partial cross section figure of the 13 embodiment of the present invention.
Figure 15 is the partial cross section figure of the 14 embodiment of the present invention.
Embodiment
At first, before the embodiment of explanation optical sheet of the present invention, the overlapping body of the optical sheet of prior art is described.
Fig. 1 is the partial cross section figure that the combination of prior art has the overlapping body 1 of optical sheet of transparent resin layer 2 with optical element face and light diffusion layer 3.The overlapping body 1 of the optical sheet of prior art, transparent resin layer 2 and light diffusion layer 3 do not have integrated, in other words, have the first and second surfaces in addition, surface.Using the optical module of so overlapping body 1 of optical sheet is desirable direction by making light when diffusion occuring and seeing through the transparent resin layer 2 with optical element face when seeing through the light diffusing sheet with light diffusion layer 3 at the light that sends from light source (there is no diagram), thereby the information of optical module is provided to the observer.The overlapping body 1 of such optical sheet is usually separately made respectively light diffusion layer 3 and is had the transparent resin layer 2 of optical element face, overlaps each other to use when the assembling of optical module.
In addition, the transparent resin layer 2 that has such optical element face is by at the mould with optical element shape, the method that the thin slice that comprises transparent resin heats extrusion forming etc. being made.
Usually, the position of the light source in optical module is positioned at a side opposite with the information display surface of optical module, namely is arranged in the bottom of the light diffusion layer of Fig. 1.In addition, in other mode, the light source of optical module for example is positioned at the sidepiece of the overlapping body 1 of optical sheet.
Then, quoted figures describes the embodiment of optical sheet of the present invention.
In the present invention, the first and second surfaces are for example by the face 12 on the partial cross section figure of Fig. 2 represented top and the face 13 of bottom.
Optical sheet in the present invention is the thin slice that is used for having in order to make the direction of light sent from the light source of light emitting module or the homogeneity of Luminance Distribution etc. become desirable optical characteristics take display or lamp decoration signboard as the various optical modules of the information display section of representative.
Interface in the present invention, be can distinguish mutually in optical sheet of the present invention the layer with layer the border.For example in Fig. 2, interface 14 is borders of light transmission layer 16a and light diffusion layer 17.
So-called optical element face in the present invention is the face that forms desirable shape, and is to make the direction of light sent from light source or the homogeneity of Luminance Distribution etc. become the face of desirable optical characteristics at described face.Optical element face in the present invention is arranged at first surface, second surface or interface.
So-called optical element in the present invention is the desirable shape that is formed at the optical element face.
Light diffusion layer in the present invention is that the layer of diffusion occurs from the light that light source sends and sees through.
Light transmission layer in the present invention is the layer of the light transmission that sends and see through from light source.
Optical sheet of the present invention is two-layer above multi-ply construction.
On optical element face in the present invention, be formed with the optical element take the concaveconvex shape of prism shape, lens shape and light scattering as representative.In addition, as the optical element that forms optical element face of the present invention, in order to obtain desirable optical characteristics, adopt the unit shape corresponding to the design of the optical module that uses, unit shape that can be independent or make up a plurality of units shape landform and be formed in the optical element face.
The unit shape of described optical element is such as being concaveconvex shape of V word shape linear prism, U word shape linear prism, pyrometric cone prism, quadrangular pyramid prism, semicylindrical lens, convex lens, concavees lens, Fresnel Lenses and light scattering etc.Such optical element can be formed at whole of optical element face, also can be formed at a part.That is, the optical element face in the present invention can have optical element.
So-called prism shape in the present invention is have plural general plane polyhedron-shaped, and is to make light disperse the shape of refraction total reflection.
So-called lens shape in the present invention is the shape with the curved surface take sphere as representative, and is make anaclasis and spread or the shape of pack.
The shape of described convex lens and concavees lens can be used any one or its combination in spherical lens, non-spherical lens.
The concaveconvex shape of the described light scattering on the optical element face in the present invention is that the mean roughness (Ra) of described optical element face is that 0.1 μ m is above and can make the concaveconvex shape of light scattering.
In the concaveconvex shape of described light scattering, the mean roughness of face (Ra) is more than 0.1 μ m, for the easy homogeneity that embodies direction of light or Luminance Distribution, more than being preferably 0.2 μ m, more than being more preferably 0.5 μ m.In addition, the mean roughness of face (Ra) is below 5 μ m, in order to reduce optical loss, is preferably below 3 μ m, is more preferably below 2 μ m.
So-called even surface in the present invention is that the mean roughness (Ra) at surface or interface is less than the face of 0.1 μ m.
The size of the concaveconvex shape of such face, the mean roughness of face (Ra) can be measured in accordance with JISB0601.
In optical sheet 11 of the present invention, thereby can make the direction of light sent from light source or the homogeneity of Luminance Distribution become desirable optical characteristics by having described optical element face, and the information of display optical module more clearly.
In optical sheet 11 of the present invention, optical component surface shape is formed in the surface of layer or the method at interface has: 1) prepare to possess roller shape mould with the shape of the shape upset of desirable optical element at side face, provide continuously transparent organic media or the transparent inorganic medium of molten condition on the roller shape mould with extrusion molding, carry out coolingly after the shape of the desirable optical element of moulding, peel off and the method that obtains from roller shape mould; 2) prepare to possess at side face the roller shape mould of the mould of the shape that the shape of desirable optical element is overturn, heated rollers shape mould, the thin slice of transparent organic media or transparent inorganic medium is provided on the roller shape mould continuously, carry out coolingly after copying the shape of desirable optical element, peel off and the method that obtains from roller shape mould; 3) preparation is with the mould of the shape of the shape upset of desirable element, heating mould, mould is pressed onto on the thin slice of transparent organic media or transparent inorganic medium, cooling with carrying out after the shape copying of desirable optical element is on thin slice, peels off and the method that obtains from mould; 4) use ultraviolet curable resin, ultraviolet curable resin is coated the mould of the shape of desirable optical element, irradiation ultraviolet radiation and the method that obtains; 5) by print process, optical element is formed at method on the thin slice of transparent organic media or transparent inorganic medium; 6) with direct cutting method, optical element is formed at the method for method on the face of thin slice of transparent organic media or transparent inorganic medium etc., but, for correctly with the shape copying of desirable element in optical sheet, preferred 1)～4) in any one method.In addition, in order to obtain optical sheet of the present invention with continuous and stable performance, preferred 1)～4) in any one method.
Also have, be called transparent situation in the present invention, refer to that total light transmittance is more than 30%.Total light transmittance is also measured with the A light source according to JIS K7105.
In the present invention, in the situation that as the parent of light transmission layer 16 or light diffusion layer 17 and adopt transparent organic media and transparent inorganic medium, the total light transmittance of this transparent organic media and transparent inorganic medium is more than 30%, is preferably more than 50%, is more preferably more than 70%.In the situation that the total light transmittance of transparent organic media and transparent inorganic medium is large, preferred because optical loss diminishes.
In optical sheet 11 of the present invention, consist of the transparent organic media of light transmission layer 16 or transparent inorganic medium can adopt (methyl) acryl resin, polycarbonate resin, vibrin, polystyrene resin, Corvic, fluororesin, polyolefin resin, cellulose acetate resin, silicone resin, polyamide, epikote, polyacrylonitrile resin, urethane resin and glass.
Particularly (methyl) acryl resin, polycarbonate resin, vibrin, Corvic and fluororesin are because performance is excellent and preferred aspect the transparency, against weather, processability and dimensional stability.In addition, when formation has the layer of optical element face, because also showing excellence aspect the flexibility of the mouldability of optical element or thin slice, so can these resins of suitable use.
In optical sheet 11 of the present invention, in the situation that glass is used in light transmission layer 16, performance is excellent aspect the transparency, against weather, dimensional stability, resistance to chemical reagents and thermotolerance.
In optical sheet 11 of the present invention, in the situation that glass is used in light transmission layer 16, for example prepare the mould with the shape of the shape of desirable optical element upset, with more than mold heated to 300 ℃, it is pressed onto on glass, carries out coolingly after the shape that has copied desirable optical element, peel off from mould, by the described method in back, such as coating glass sheet and carry out stacked method etc. by the light diffusion layer that will contain ultraviolet curable resin, can obtain optical sheet.
In optical sheet 11 of the present invention, light transmission layer 16 can contain the various adjuvants of light stabilizer, dyestuff, pigment, charged preventor, plasticizer, spreading agent and inserts etc.
In optical sheet 11 of the present invention, the light transmission layer can be two-layer more than.In the situation that the light transmission layer is two-layer above, each light transmission layer can be identical composition, can be also different each other compositions.In the situation that each light transmission layer is identical composition, it can be for example the thickness different formation each other of the molecular weight of the kind of respectively contained adjuvant or amount, resin and layer.
In optical sheet 11 of the present invention, consist of the transparent organic media of light diffusion layer 17 or transparent inorganic medium can adopt (methyl) acryl resin, polycarbonate resin, vibrin, polystyrene resin, Corvic, fluororesin, polyolefin resin, cellulose acetate resin, silicone resin, polyamide, epikote, polyacrylonitrile resin, urethane resin and glass.
Particularly the performance aspect the dimensional stability of the processability of the transparency, against weather, optical sheet and optical element of (methyl) acryl resin, polycarbonate resin, vibrin, Corvic and fluororesin is excellent.In addition, these resins are because so that see through and also to show excellence aspect the flexibility of dispersiveness in the atomic layer that the purpose of the light diffusion of optical sheet adds and thin slice, so can be suitable for the present invention.
In optical sheet 11 of the present invention, transparent organic media or transparent inorganic medium as consisting of light diffusion layer 17 can adopt ultraviolet curable resin.
In optical sheet 11 of the present invention, in the situation that use ultraviolet curable resin, for example as shown in Figure 9 in the formation more than two-layer, by ultraviolet curable resin being coated on the light transmission layer 16a with optical element face, and irradiation ultraviolet radiation, thereby become light transmission layer 16a with optical element face and light diffusion layer 17 integrated formation.The optical sheet of making as previously discussed, because there is no need to peel off from mould, thus can not cause the distortion of the optical element when peeling off from mould, thus have the feature of the good excellence of the close attachment of interlayer.
In optical sheet 11 of the present invention, consist of the transparent organic media of light diffusion layer 17 or the various adjuvants that the transparent inorganic medium can contain light stabilizer, dyestuff, pigment, charged preventor, plasticizer, spreading agent and inserts etc.
The light diffusion layer 17 of optical sheet 11 of the present invention preferably consists of by containing atomic transparent organic media or transparent inorganic medium.
So-called particulate in the present invention refers to the particle of mean grain size 10～1000nm.By using this big or small particulate, thereby causing desirable light, light diffusion layer spreads.
Be used for described particulate of the present invention and be preferably resin or inorganics.
particularly described particulate is as melamine resin, (methyl) acryl resin, urethane resin, polystyrene resin, the resin that polyolefin resin and fluororesin are such, and sodium oxide molybdena, kali, aluminium oxide, bismuth oxide, cerium oxide, cupric oxide, silicon dioxide, tin oxide, yttria, zinc paste, titanium dioxide, zirconia, glass, quartzy, diamond, the inorganics of any one in sapphire and talcum, because can cause desirable light diffusion and can reduce optical loss and preferred in light diffusion layer 17 when the information of optical module shows.
Described particulate can be single composition, can be also a plurality of compositions, can suitably use.For example with the particulate of silica-coating in the formation of melamine resin, light diffusing can be high and can suitablely use.
Have, described particulate has silicon dioxide system or the resinous particulate of the structure of hollow form again, and namely the inner particulate that contains air, because have the formation that has refringence in particulate, can suitablely use so light scattering property is high.
As can be used in particulate of the present invention, for example can enumerate trade name エ Port ス タ ー, シ ー ホ ス タ ー and the ソ リ オ ス タ ー of Japanese catalyzer Co., Ltd. system; The trade name オ プ ト ビ ー ズ of Nissan Chemical Ind Ltd's system; The trade name ア ー ト パ ー Le of Industrial Co., Ltd's system on root; The trade name ダ イ ミ ッ ク ビ ー ズ of Co., Ltd.'s system of refining large day; Trade name ガ Application ツ パ ー Le, the dayglow catalyzer that ガ Application Star changes into Co., Ltd.'s system changes into the trade name ス ル ー リ ア of strain formula society system; The trade name テ Network Port リ マ ー of Sekisui Plastics Co., Ltd.'s system; And the trade name ケ ミ ス ノ ー of Soken Chemical ﹠ Engineering Co., Ltd.'s system.
Described atomic shape is special the restriction not,, roughly spherical, ellipsoid of revolution shape, cubic, needle-like, bar-shaped, tabular and flakey etc. spherical such as enumerating.Particularly in order to obtain desirable light diffusing energy, because particulate easily is distributed to light diffusion layer, the light diffusion on described light diffusion layer occurs equably, so be preferably spherical or roughly spherical.
Described atomic mean grain size is 10～10000nm, is preferably 10～100nm.If atomic mean grain size is more than 10nm, be difficult to occur the reduction of light diffusing energy.In addition, if atomic mean grain size is below 1000nm, particulate easily is distributed to light diffusion layer.
Particularly in the situation that described atomic mean grain size is below 100nm because the Optical Absorption on light diffusion layer is little, so optical loss diminish, thereby particularly preferably.
Described atomic mean grain size can be measured according to JIS Z8901.
When optical sheet 11 of the present invention is assembled into optical module, in the situation that light diffusion layer 17 is for containing atomic transparent organic media or transparent inorganic medium, the illuminance distribution of the information display surface of optical module.Its result, for example in the situation that use the light source of point-like or wire, because the shape of light source that can hidden optical module with respect to the observer, so preferred.
In optical sheet 11 of the present invention, the transparent organic media of described light diffusion layer 17 or transparent inorganic medium be (methyl) acryl resin, polycarbonate resin, vibrin, polystyrene resin, Corvic, fluororesin, polyolefin resin, cellulose acetate resin, silicone resin, polyamide, epikote, at least a in polyacrylonitrile resin, urethane resin and glass, because can keep the optical characteristics of light diffusion layer and bond particulate and can retaining layer consist of, so preferred.
Particularly (methyl) acryl resin, polycarbonate resin, vibrin, Corvic and fluororesin are so because performance is excellent preferred aspect the transparency, against weather, processability and dimensional stability.In addition, because when formation has the layer of optical element face, also showing excellence aspect the flexibility of the mouldability of optical element or thin slice, so can these resins of suitable use.
In optical sheet 11 of the present invention, the transparent organic media of formation light diffusion layer 17 or the refractive index of transparent inorganic medium are 1.3～2.5 scope, because optical loss is little, in addition, the demonstration of the information of optical module becomes clear and definite, so preferred.
Refractive index can be measured according to JIS K7105.
Refractive index of the present invention is the value under wavelength 589nm.
In optical sheet 11 of the present invention, the ratio (na/nb) of the transparent organic media of formation light diffusion layer 17 or the refractive index (na) of transparent inorganic medium and described atomic refractive index (nb) is in 0.52～0.98 or 1.02～1.92 scope, because appropriately carry out the diffusion of light in light diffusion layer, the information of the little and optical module of optical loss shows and becomes clear and definite, so preferred.Have again, if described than (na/nb) in 0.6～0.95 or 1.05～1.67 scope, be more preferably because the diffusion of desirable light occurs in light diffusion layer.Described 0.8～0.95 or 1.05～1.25 the scope that is more preferably than (na/nb) is arranged again.
The ratio (na/nb) of the transparent organic media of formation light diffusion layer 17 or the refractive index (na) of transparent inorganic medium and described atomic refractive index (nb) is in the situation that over 0.98 and less than in 1.02 scope, namely in the situation that the value of the transparent organic media of formation light diffusion layer 17 or transparent inorganic medium and atomic refractive index is almost identical, the situation that the diffusion of desirable light does not occur is arranged in light diffusion layer.
The thickness of optical sheet 11 of the present invention is 10～2000 μ m, is preferably 50～750 μ m, is desirable optical characteristics because can make the homogeneity of direction of light or Luminance Distribution, and when the assembling of optical module easy operating optical sheet, so preferred.
In the prior art, in the situation that the thin slice that attenuate uses in order to reduce optical loss, it is difficult that the masking of thin slice becomes, and in addition, the inequality of the optical characteristics that the impact due to uneven thickness causes occurs easily.Have again, in the situation that overlapping thin thin slice uses, because use a plurality of optical sheets, so be difficult to the operating optical sheet when the assembling of optical module.Therefore, it is difficult keeping optical property and attenuate optical sheet.
In addition, in the prior art, in the situation that use a plurality of optical sheets, even for example dwindle optical sheet distance each other, also because air layer is present between optical sheet, so the optical loss that generation causes due to the lip-deep reflection at mutual optical sheet.Have again, in the situation that use a plurality of optical sheets, because difference occurs due to the difference of each other position on optical characteristics, so the inequality of the optical characteristics between optical module easily occurs.
In the preferred mode of optical sheet 11 of the present invention one is for example the formation with interface as shown in Figure 2.For example in Fig. 2, light transmission layer 16a contacts with light diffusion layer 17, and optical sheet 11 has interface 14.In other words, have light transmission layer 16a and a light diffusion layer 17 of optical element face integrated.
In the situation that such light transmission layer 16a and light diffusion layer 17 are transparent organic media or transparent inorganic medium, the composition separately of this transparent organic media or transparent inorganic medium can be identical, also can be different.
In one in the preferred mode of optical sheet 11 of the present invention, in for example having as shown in Figure 2 the formation at interface, the manufacture method of light transmission layer 16a or light diffusion layer 17 has: the 1) method of bonding after separately making respectively; 2) one-body molded i.e. method to being filmed more than two-layer simultaneously; And 3) use ultraviolet curable resin, in advance a layer is filmed, make the method more than two-layer ultraviolet curable resin being coated irradiation ultraviolet radiation after another layer.For at the interface 14 more securely bonding have light transmission layer 16a and the light diffusion layer 17 of optical element face, preferred 2) or 3) manufacture method.
In the preferred mode of optical sheet 11 of the present invention one, for example in the formation that has as shown in Figure 2 the interface, be light transmission layer 16a and light diffusion layer 17 integrated formation.Therefore, 11 groups of optical sheets of the present invention are being entered in the optical module, compared with prior art, because cut down the quantity that is assembled in the thin slice in optical module, so the light absorption on optical sheet is little, optical loss diminishes, more clearly the information of display optical module.
In the preferred mode of optical sheet 11 of the present invention one, for example in the formation that has as shown in Figure 2 the interface, be light transmission layer 16a and light diffusion layer 17 integrated formation.By using such optical sheet 11, also can realize the slimming of optical module thereby can have with the equal above optical characteristics of prior art.
In the preferred mode of optical sheet 11 of the present invention one, for example in the formation that has as shown in Figure 2 the interface, be light transmission layer 16a and light diffusion layer 17 integrated formation.By using such optical sheet 11, thereby become easy to the assembling of optical module.
In the preferred mode of optical sheet 11 of the present invention one is for example the formation that light diffusion layer 17 has the optical element face as shown in Figure 8.When the optical sheet 11 with the first mode of the present invention is assembled into optical module, because cut down compared with prior art the quantity of the thin slice that is assembled into optical module, so the light absorption on optical sheet is little, optical loss diminishes, more clearly the information of display optical module.
In addition, be that other individual situation is compared with light diffusion layer and the light transmission layer with optical element face of prior art, the optical sheet of the application of the invention, thereby the injured chance of the optical sheet in the time of can reducing assembling.
Use the light source (not diagram) in the optical module of optical sheet 11 of the present invention, can suitable use cold-cathode tube, LED, organic or inorganic EL body etc.
Use the light source in the optical module of optical sheet 11 of the present invention, for example can illustration be arranged at a side opposite with the information display surface of optical module, be the position of the bottom of the light diffusion layer in Fig. 2, still, the not special regulation in the position of light source.In other mode, the light source of optical module for example is positioned at the sidepiece of optical sheet.Have, light source also can be arranged at the top of the light transmission layer 16a in Fig. 2 again.The position of light source can be arranged at desirable position according to the design of optical module.
Quoted figures is described in detail the embodiment example of optical sheet of the present invention.
Fig. 2 is the partial cross section figure of the optical sheet 11 of the first embodiment of the present invention.This optical sheet 11 comprises light transmission layer 16a and light diffusion layer 17, and these two layers sequentially carry out stacked according to this.Light transmission layer 16a has the first surface 12 as the optical element face, and light diffusion layer 17 has the second surface 13 as even surface.Interface 14 bondings of light transmission layer 16a and light diffusion layer 17 are made into even surface.
Fig. 3 is the partial cross section figure of the optical sheet of the second embodiment of the present invention.This optical sheet 11 comprises the first light transmission layer 16a, light diffusion layer 17 and the second light transmission layer 16b, and these three layers sequentially carry out stacked according to this.The first light transmission layer 16a has first surface 12, the second light transmission layer 16b as the optical element face and has second surface 13 as even surface.Interface 15 bondings of the interface 14 of the first light transmission layer 16a and light diffusion layer 17 and the second light transmission layer 16b and light diffusion layer 17 are made into even surface.
Fig. 4 is the partial cross section figure of the optical sheet of the 3rd embodiment of the present invention.This optical sheet 11 comprises the first light transmission layer 16a, light diffusion layer 17 and the second light transmission layer 16b, and these three layers sequentially carry out stacked according to this.The first light transmission layer 16a has first surface 12, the second light transmission layer 16b as the first optical element face and has second surface 13 as the second optical element face.Interface 15 bondings of the interface 14 of the first light transmission layer 16a and light diffusion layer 17 and the second light transmission layer 16b and light diffusion layer 17 are made into even surface.
Optical sheet of the present invention as the 3rd embodiment in Fig. 4, also can preferably adopt the mode with plural optical element face.
In the situation that optical sheet of the present invention has two above optical element faces, can be also for example prism shape for the optical element that is formed at some optical element faces, the optical element that is formed at other optical element face is that lens shape is such, mutually different shape.
In addition, in the situation that optical sheet of the present invention has plural identical shaped optical element face, the direction and the phase place that are formed at the optical element of these optical element faces as the unit shape can be consistent mutually, also can be different.For example, when the optical element of two sides' optical element face is V word shape linear prism, be formed at the direction of crest line of direction and the V word shape linear prism of the optical element face that is formed at the opposing party of crest line of V word shape linear prism of a side optical element face, in order to obtain desirable optical characteristics, can be identical, can be also different directions, for example also can be orthogonal.In addition, in the situation that it is identical to be formed at the interval of the direction of crest line of V word shape linear prism of two optical element faces and crest line, be formed at the mutual position of crest line of position and the V word shape linear prism of the optical element face that is formed at the opposing party of crest line of V word shape linear prism of a side optical element face, in order to obtain desirable optical characteristics, information display surface from optical module, can be mutual consistent position, can be also the position of departing from.
Like this, with mutual optical element face only the optical sheet of compare, optical sheet with plural optical element face, because the combination by the optical element face makes the degree of freedom of the design of optical sheet become large and can easily carry out the optical characteristics design that the information of optical module shows, so preferred.
Fig. 5 is the partial cross section figure of the optical sheet of the 4th embodiment of the present invention.This optical sheet 11 comprises the first light transmission layer 16a, the 3rd light transmission layer 16c, light diffusion layer 17 and the second light transmission layer 16b, and these four layers sequentially carry out stacked according to this.The 3rd light transmission layer 16c is held between the first light transmission layer 16a and the second light transmission layer 16b, and light diffusion layer 17 is held between the 3rd light transmission layer 16c and the second light transmission layer 16b.The first light transmission layer 16a has first surface 12, the second light transmission layer 16b as the first optical element face and has second surface 13 as the second optical element face.The interface 18 of the interface 15 of the interface 14 of the 3rd light transmission layer 16c and light diffusion layer 17, the second light transmission layer 16b and light diffusion layer 17 and the saturating multilayer 16a of the first light and the 3rd light transmission layer 16c bonds respectively, is made into even surface.The shape (optical element) of the first optical element face and the second optical element face as previously discussed, can be identical shaped, can be also difformity.
Fig. 6 is the partial cross section figure of the optical sheet of the 5th embodiment.This optical sheet 11 is layers that are made of the first and second surfaces, and first surface 12 is optical element faces, and second surface 13 is even surface, and light diffusion layer 17 is the formations with optical element face.
Fig. 7 is the partial cross section figure of the optical sheet of the 6th embodiment.This optical sheet 11 is layers that are made of the first and second surfaces, and first surface 12 and second surface 13 are optical element faces, and light diffusion layer 17 is the formations with optical element face.
Fig. 8 is the partial cross section figure of the optical sheet of the 7th embodiment of the present invention.This optical sheet 11 comprises light diffusion layer 17 and light transmission layer 16a, and these two layers sequentially carry out stacked according to this.Light diffusion layer 17 has the first surface 12 as the optical element face, and light transmission layer 16a has the second surface 13 as the optical element face.Light diffusion layer 17 bonds with the interface 14 of light transmission layer 16a, is made into even surface.
Fig. 9 is the partial cross section figure of the optical sheet of the 8th embodiment of the present invention.This optical sheet 11 comprises light transmission layer 16a and light diffusion layer 17, and these two layers sequentially carry out stacked according to this.Light transmission layer 16a has the first surface 12 as even surface, and light diffusion layer 17 has the second surface 13 as even surface.Interface 14 bondings of light transmission layer 16a and light diffusion layer 17 are made into the optical element face.
Figure 10 is the partial cross section figure of the optical sheet of the 9th embodiment of the present invention.This optical sheet 11 comprises the first light transmission layer 16a, light diffusion layer 17 and the second light transmission layer 16b, and these three layers sequentially carry out stacked according to this.Light diffusion layer 17 is sandwiched between the first light transmission layer 16a and the second light transmission layer 16b.The first light transmission layer 16a has first surface 12, the second light transmission layer 16b as even surface and has second surface 13 as even surface.Interface 14 bondings of the first light transmission layer 16a and light diffusion layer 17 are made into the first optical element face.In addition, interface 15 bondings of the second light transmission layer 16b and light diffusion layer 17 are made into the second optical element face.The shape (optical element) of the first optical element face and the second optical element face as previously discussed, can be identical shaped, can be also difformity.
Figure 11 is the partial cross section figure of the optical sheet of the tenth embodiment of the present invention.This optical sheet 11 comprises the first light transmission layer 16a, light diffusion layer 17 and the second light transmission layer 16b, and these three layers sequentially carry out stacked according to this.Light diffusion layer 17 is sandwiched between the first light transmission layer 16a and the second light transmission layer 16b.The first light transmission layer 16a has first surface 12, the second light transmission layer 16b as even surface and has second surface 13 as even surface.Interface 14 bondings of the first light transmission layer 16a and light diffusion layer 17 are made into the optical element face.In addition, interface 15 bondings of the second light transmission layer 16b and light diffusion layer 17 are made into even surface.
Figure 12 is the partial cross section figure of the optical sheet of the 11 embodiment of the present invention.This optical sheet 11 comprises the first light transmission layer 16a, light diffusion layer 17 and the second light transmission layer 16b, and these three layers sequentially carry out stacked according to this.Light diffusion layer 17 is sandwiched between the first light transmission layer 16a and the second light transmission layer 16b.The first light transmission layer 16a has first surface 12, the second light transmission layer 16b as even surface and has second surface 13 as the first optical element face.Interface 14 bondings of the first light transmission layer 16a and light diffusion layer 17 are made into the second optical element face.In addition, interface 15 bondings of the second light transmission layer 16b and light diffusion layer 17 are made into the 3rd optical element face.The shape (optical element) of the first optical element face to the three optical element faces, same as described above, can be respectively identical shaped, can be also difformity.
Figure 13 is the partial cross section figure of the optical sheet of the 12 embodiment of the present invention.This optical sheet 11 comprises the first light diffusion layer 17a, light transmission layer 16 and the second light diffusion layer 17b, and these three layers sequentially carry out stacked according to this.Light transmission layer 16 is sandwiched between the first light diffusion layer 17a and the second light diffusion layer 17b.The first light diffusion layer 17a has first surface 12, the second light diffusion layer 17b as the first optical element face and has second surface 13 as the second optical element face.Interface 15 bondings of the interface 14 of the first light diffusion layer 17a and light transmission layer 16 and the second light diffusion layer 17b and light transmission layer 16 are made into even surface.
In the situation that the first light diffusion layer 17a in the optical sheet of the 12 embodiment of the present invention and the second light diffusion layer 17b are made of transparent organic media or transparent inorganic medium, this transparent organic media or transparent inorganic medium, at the first light diffusion layer 17a and can be identical at the second light diffusion layer 17b, can be not identical yet.In the atomic kind that is contained in transparent organic media or transparent inorganic medium and amount in the situation that the first light diffusion layer 17a is different with the second light diffusion layer 17b, because can control more easily the optical characteristics of optical sheet, so preferred.
The first light diffusion layer 17a in the optical sheet of the 12 embodiment of the present invention and the thickness of the second light diffusion layer 17b can be identical respectively, also can be different each other.In the situation that the thickness of the first light diffusion layer 17a and the second light diffusion layer 17b is different, because can control more easily the optical characteristics of optical sheet 11, so preferred.
As previously discussed, the optical sheet of the 12 embodiment of the present invention is because first surface 12 and second surface 13 are the optical element face, so the degree of freedom of the design of optical sheet becomes greatly, can easily carry out the optical characteristics design of the information demonstration of optical module, so preferred.Also have, the shape (optical element) of the first optical element face and the second optical element face is same as described above, can be identical, and also can be different each other.In the situation that identical, be formed at direction and the phase place of the optical element of optical element face as the unit shape, can be consistent each other, can be not identical yet, but from easily carrying out the viewpoint of optical characteristics design, be preferably consistent.
The first light diffusion layer 17a in the optical sheet of the 12 embodiment of the present invention and the refractive index of the second light diffusion layer 17b are preferably greater than the refractive index of light transmission layer 16.In the situation that become such relation, incide light total reflection on interface 14 and 15 of optical sheet 11, thereby there is no the loss of light, and can appropriately control the optical characteristics of optical sheet 11.For example, be scattered in by making the high particulate of refractive index transparent organic media or the transparent inorganic medium that consists of light diffusion layer, thereby compare with the refractive index of light transmission layer 16, can increase the refractive index of the first light diffusion layer 17a and the second light diffusion layer 17b.
Figure 14 is the partial cross section figure of the optical sheet of the 13 embodiment of the present invention.This optical sheet 11 comprises the first light diffusion layer 17a, the first light transmission layer 16a, the 3rd light transmission layer 16c, the second light transmission layer 16b and the second light diffusion layer 17b, and these five layers sequentially carry out stacked according to this.The light transmission layer that is held between the first light diffusion layer 17a and the second light diffusion layer 17b is made of three layer 16a～16c in the present embodiment, still, can be a layer, can be also two layers, can be also four more than layer.The first light diffusion layer 17a has first surface 12, the second light diffusion layer 17b as the first optical element face and has second surface 13 as the second optical element face.The interface 14a bonding of the first light diffusion layer 17a and the first light transmission layer 16a is made into the 3rd optical element face.In addition, the interface 15a of the second light diffusion layer 17b and the second light transmission layer 16b bonding is made into the 4th optical element face.Have, the interface 15b bonding of the interface 14b of the first light transmission layer 16a and the 3rd light transmission layer 16c and the second light transmission layer 16b and the 3rd light transmission layer 16c is made into even surface again.Also have, any one party of interface 14a and interface 15a also can be made into even surface., in the situation that only there is interface 14a to be made into even surface, interface 15a becomes the 3rd optical element face.
The first light diffusion layer 17a and the second light diffusion layer 17b in the optical sheet of the 13 embodiment of the present invention have respectively 2 optical element faces.For example, at light diffusion layer 17a, first surface 12 is respectively the optical element face with the interface 14a of the face of the opposition side that becomes this surface 12.The component shape of these 2 optical element faces can be identical, also can be different each other.In the situation that identical, the direction of optical element or phase place can be consistent each other, also can be not identical.As previously discussed, the optical sheet of the 13 embodiment of the present invention is because first surface 12 and interface 14a are the optical element face, so the degree of freedom of the design of optical sheet becomes greatly, and so the optical characteristics design that the information that can easily carry out optical module shows is preferred.In addition, interface 14a and 15a as the optical element face are not contacted with mould, this interface 14a and 15a can be formed as the optical element face.Therefore, can avoid making the optical element face to sustain damage etc. when peeling off mould.Have again, have in the inboard of optical sheet as interface 14a and the 15a of optical element face, wait and make the optical element surface damage so can reduce significantly to result to impact.Also have, about the above-mentioned item of the first light diffusion layer 17a, also identical about the second light diffusion layer 17b.
The first light diffusion layer 17a and the second light diffusion layer 17b in the optical sheet of the 13 embodiment of the present invention is that have respectively, component shapes 2 optical element faces are preferably identical.For example, at light diffusion layer 17a, first surface 12 is identical with the component shape of the optical element face separately of interface 14a, in addition, if direction or phase place are consistent shape, can control rightly the optical property of the light that incides optical sheet 11.In the situation that identical, the first optical element face and the second optical element face are preferably parallel to each other.For example, in the situation that the first optical element face that first surface 12 has is parallel each other with the 3rd optical element face that the interface 14a of the first light diffusion layer 17a and the first light transmission layer 16a has, shape, direction and the phase place of the optical element face separately of the first optical element face and the 3rd optical element face are consistent, and the thickness of light transmission layer 16a is roughly even.Same item also can be suitable for about two optical element faces of light diffusion layer 17b.
The first light diffusion layer 17a of the optical sheet of the 13 embodiment of the present invention and the refractive index of the second light diffusion layer 17b are preferably greater than first～the 3rd light transmission layer 16a～16c.In addition, the refractive index of the first light transmission layer 16a and the second light transmission layer 16b is preferably greater than the 3rd light transmission layer 16c.By making such formation, thereby the light that incides optical sheet 11 does not have the loss of light thus in interface 14a, 14b, 15a and 15b total reflection, can control rightly the optical characteristics of optical sheet 11.Also have, in the situation that from the sidepiece incident light of optical sheet, the refractive index of the 3rd light transmission layer 16c is greater than the refractive index of the first light transmission layer 16a and the second light transmission layer 16b, and the refractive index of these light transmission layer 16a and 16b also can be greater than the refractive index of light diffusion layer 17a and 17b.In above-described situation, because can be with from the inner optically focused of the light of sidepiece incident, so can be with this photoconduction to a distant place more.
In the optical sheet of the 13 embodiment of the present invention, also can change respectively light transmission layer 16a and light transmission layer 16b into the 3rd light diffusion layer (17c) and the 4th light diffusion layer (17d).Light diffusion layer 17a and light diffusion layer (17c) still are made in interface 14a bonding the layer that can mutually distinguish.As the method for distinguishing as mentioned above, for example can enumerate making transparent organic media or transparent inorganic medium or contained atomic kind or the amount diverse ways of light diffusion layer that consists of light diffusion layer.Similarly, also go for light diffusion layer 17b and the 4th light diffusion layer (17d).Also have, the refractive index of light diffusion layer 17a and 17b is preferably greater than light transmission layer (17c) and (17d).In addition, light transmission layer (17c) and refractive index (17d) are preferably greater than light transmission layer 16c.
Figure 15 is the partial cross section figure of the optical sheet of the 14 embodiment of the present invention.This optical sheet 11 comprises the first light transmission layer 16a, the first light diffusion layer 17a, the 3rd light transmission layer 16c, the 5th light transmission layer 16e, the 4th light transmission layer 16d, the second light diffusion layer 17b and the second light transmission layer 16b, and these seven layers sequentially carry out stacked according to this.Being held on the light transmission layer between the first light diffusion layer 17a and the second light diffusion layer 17b, being made of three layer 16c～16e in the present embodiment, still, can be a layer, can be also two layers, can be also four more than layer.In addition, also can omit any one party of the first light diffusion layer 17a or the second light diffusion layer 17b.The first light transmission layer 16a has first surface 12, the second light transmission layer 16b as the first optical element face and has second surface 13 as the second optical element face.The interface 15b bonding of the interface 14b of the interface 15a of the interface 14a of the first light transmission layer 16a and the first light diffusion layer 17a, the second light transmission layer 16b and the second light diffusion layer 17b, the first light diffusion layer 17a and the 3rd light transmission layer 16c and the second light diffusion layer 17b and the 4th light transmission layer 16d is made into respectively the 3rd optical element face and the 4th optical element face.Have, the interface 15c bonding of the interface 14c of the 3rd light transmission layer 16c and the 5th light transmission layer 16e and the 4th light transmission layer 16d and the 5th light transmission layer 16e is made into even surface again.Also have, interface 14a, 14b, 15a and 15b all or a part also can be made into even surface.
The shape (optical element) of the optical element face that has on first surface 12 and second surface 13, interface 14a, 14b, 15a and 15b, same as described above, can be identical, also can be different each other.In the situation that identical, identical with the above, the direction of optical element and phase place can be consistent each other, also can be different.But as previously discussed, the shape of optical element face is identical, then has, and direction and the phase place of optical element face are consistent, from the viewpoint of appropriately controlling simply optical property and preferred.
In the optical sheet of the 14 embodiment of the present invention, because first surface 12 and interface 14a and 14b are the optical element face, so it is large that the degree of freedom of the design of optical sheet becomes, can easily carry out the optical characteristics design of the information demonstration of optical module, so preferred.In addition, interface 14a and 14b as the optical element face are not contacted with mould, this interface 14a and 14b can be formed as the optical element face.Therefore, can avoid making the optical element face to sustain damage etc. when peeling off mould.Have again, have in the inboard of optical sheet as interface 14a and the 14b of optical element face, wait and make the optical element surface damage so can reduce significantly to result to impact.Also have, about second surface 13 and interface 15a and 15b, identical with first surface 12 and interface 14a and 14b.
In the optical sheet of the 14 embodiment of the present invention, the refractive index of light transmission layer 16a and 16b is preferably different respectively from light diffusion layer 17a and 17b.In addition, the refractive index of light diffusion layer 17a and 17b is preferably different respectively from light transmission layer 16b and 16d.Have, the refractive index of light transmission layer 16b and 16d is preferably different from light transmission layer 16e respectively again.
In the optical sheet of the 14 embodiment of the present invention, the refractive index of light transmission layer 16a and 16e is preferably greater than light diffusion layer 17a and 17b.In addition, the refractive index of light diffusion layer 17a and 17b is preferably greater than light transmission layer 16b and 16d.Have, the refractive index of light transmission layer 16b and 16d is preferably greater than light transmission layer 16c again.By making such formation, thereby the light that incides optical sheet 11 does not have the loss of light thus in the interface total reflection, can control rightly the optical characteristics of optical sheet 11.
Also have, in the situation that from the sidepiece incident light of optical sheet, can make this light be gathered in light diffusion layer 17b, 17b by interface 14b, 15b, make light through this light diffusion layer 17b, 17b by interface 14a, 15a as desirable optical characteristics outgoing.In addition, in the situation that make light from the sidepiece incident of optical sheet, the refractive index of light transmission layer 16c can be greater than the refractive index of light transmission layer 16b and 16d, the refractive index of these light transmission layer 16b and 16d can be greater than the refractive index of light diffusion layer 17a and 17b, and the refractive index of these light diffusion layers 17a and 17b can be greater than the refractive index of light transmission layer 16a and 16e.In above-described situation, because can be with from the inner optically focused of the light of sidepiece incident, so can be with this photoconduction to a distant place more.
The optical sheet of the 14 embodiment of the present invention, because the light transmission layer is the layer in the outside, so be in the mode of the layer in the outside compares with light diffusion layer, for example at the light that incides optical sheet in the first surface outgoing, the light that can suppress outgoing exceedingly spreads, and can control rightly the optical characteristics of optical sheet.
The optical sheet of the application of the invention, thus compared with prior art, the light absorption in the time of the light transmission optical sheet that sends from light source diminishes, and therefore, can reduce optical loss.
In addition, the optical sheet of the application of the invention, thereby the quantity that can cut down thin slice, and can suppress the energy consumption of light source.In addition, can have the above optical characteristics of grade same as the prior art, and can realize the slimming of optical module, and can easily carry out the assembling of optical module.
Have again, the of the present invention the the 3rd, the 4th, the 9th and the optical sheet of the 11 embodiment, because have plural optical element face, so can easily be best suited for the design of the optical characteristics that the information of optical module shows.
Have again, the of the present invention the the 8th, the 9th, the tenth and the optical sheet of the 11 embodiment, because have the optical element face in optical sheet, so for example be not subject to the injured impact on optical sheet surface in the assembling of optical module, can keep being best suited for the performance that the information of optical module shows.
Utilize possibility on industry
By optical sheet of the present invention is used in optical module, thus can make the direction of light sent from light source or Luminance Distribution homogeneity, be that light diffusing becomes desirable optical characteristics, and, can cut down the quantity for the optical sheet of optical module.Therefore, the light absorption on optical sheet is little, and optical loss diminishes.Have again, can realize the slimming of optical module, and can easily carry out the assembling of optical module.
The explanation of symbol
1 ... the overlapping body of optical sheet
2 ... transparent resin layer
3 ... light diffusion layer
11 ... optical sheet
12 ... first surface
13 ... second surface
14,15,18 ... the interface
16 ... the light transmission layer
17 ... light diffusion layer
Claims (18)
1. optical sheet is characterized in that:
Consisted of by the first and second surfaces, had at least two layers,
At least one surface or interface are the optical element face,
At least one layer is light diffusion layer.
2. optical sheet as claimed in claim 1 is characterized in that:
Described light diffusion layer has described optical element face.
3. as claim 1 or 2 described optical sheets, it is characterized in that:
At least one party on described the first and second surfaces has described optical element face.
4. optical sheet as described in any one in claim 1～3 is characterized in that:
At least one party on described the first and second surfaces has described optical element face, and described light diffusion layer has described optical element face.
5. optical sheet as claimed in claim 1 is characterized in that:
Has plural described optical element face.
6. optical sheet as claimed in claim 5 is characterized in that:
The both sides on described the first and second surfaces have described optical element face.
7. optical sheet as claimed in claim 5 is characterized in that:
Comprise the described light diffusion layer and the light transmission layer that have as the described first surface of described optical element face.
8. optical sheet as claimed in claim 5 is characterized in that:
Comprise the first light diffusion layer of having as the described first surface of the first optical element face, have as the second light diffusion layer of the described second surface of the second optical element face identical or different from described the first optical element face and be held on described the first light diffusion layer and described the second light diffusion layer between the light transmission layer.
9. optical sheet as claimed in claim 8 is characterized in that:
As from described the first optical element face and described the second optical element face in any one party identical or with equal different the 3rd optical element face and have the interface of described the first light diffusion layer and described light transmission layer and at least one party at the interface of described the second light diffusion layer and described light transmission layer of described the first optical element face and described the second optical element face.
10. optical sheet as claimed in claim 9 is characterized in that:
Described the first optical element face, described the second optical element face and described the 3rd optical element face are parallel to each other identical shaped.
11. optical sheet as described in any one in claim 7～10 is characterized in that:
The refractive index of described the first light diffusion layer and described the second light diffusion layer is different from the refractive index of described light transmission layer.
12. optical sheet as claimed in claim 11 is characterized in that:
The refractive index of described the first light diffusion layer and described the second light diffusion layer is greater than the refractive index of described light transmission layer.
13. optical sheet as claimed in claim 5 is characterized in that:
Comprise and have as the first light transmission layer of the described first surface of the first optical element face, described light diffusion layer and the second light transmission layer, described the first light transmission layer has as the identical or different from described the first optical element face second optical element face and interface described light diffusion layer, described the second light transmission layer have as from described the first optical element face and described the second optical element face in a side identical or with both sides the different the 3rd optical element face and interface described light diffusion layer.
14. optical sheet as claimed in claim 5 is characterized in that:
comprise the first light transmission layer that has as the described first surface of the first optical element face, described light diffusion layer, has the second light transmission layer as the described second surface of the second optical element face identical or different from described the first optical element face, described the first light transmission layer have as identical from any one party of described the first optical element face and described the second optical element face or with equal the different the 3rd optical element face and the interfaces described light diffusion layer of described the first optical element face and described the second optical element face, described the second light transmission layer have as from described the first optical element face any one party to described the 3rd optical element face identical or with described the first optical element face to equal the different the 4th optical element face and the interfaces described light diffusion layer of described the 3rd optical element face.
15. optical sheet as claimed in claim 14 is characterized in that:
Described the first optical element face, described the second optical element face, described the 3rd optical element face and described the 4th optical element face are parallel to each other identical shaped.
16. optical sheet as described in any one in claim 13～15 is characterized in that:
The refractive index of described the first light transmission layer and described the second light transmission layer is different respectively from the refractive index of described light diffusion layer.
17. optical sheet as claimed in claim 16 is characterized in that:
The refractive index of described the first light transmission layer and described the second light transmission layer is greater than the refractive index of described light diffusion layer.
18. as claim 13 or 14 described optical sheets, it is characterized in that:
Described the second light transmission layer is made of a plurality of layers of institute, the refractive index of described a plurality of layers, and the layer in the outside is higher.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010225947 | 2010-10-05 | ||
| JP2010-225947 | 2010-10-05 | ||
| PCT/JP2011/072933 WO2012046754A1 (en) | 2010-10-05 | 2011-10-05 | Optical sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103154780A true CN103154780A (en) | 2013-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011800486989A Pending CN103154780A (en) | 2010-10-05 | 2011-10-05 | Optical sheet |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPWO2012046754A1 (en) |
| KR (1) | KR101530790B1 (en) |
| CN (1) | CN103154780A (en) |
| TW (1) | TW201234056A (en) |
| WO (1) | WO2012046754A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109856714A (en) * | 2018-10-23 | 2019-06-07 | 友达光电股份有限公司 | The display of light leakage prevention film assembly and application the light leakage prevention film assembly |
| CN112305647A (en) * | 2019-07-29 | 2021-02-02 | 唯亚威通讯技术有限公司 | Encapsulated diffuser |
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| US20070177386A1 (en) * | 2004-01-05 | 2007-08-02 | Dai Nippon Printing Co., Ltd. | Light diffusion film, surface light source unit, and liquid crystal display |
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| JP2009265640A (en) * | 2008-03-31 | 2009-11-12 | Mitsubishi Rayon Co Ltd | Prism sheet |
| JP2010085477A (en) * | 2008-09-29 | 2010-04-15 | Dainippon Printing Co Ltd | Prism sheet, transmissive screen, and rear projection type display device |
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2011
- 2011-10-05 CN CN2011800486989A patent/CN103154780A/en active Pending
- 2011-10-05 JP JP2012537729A patent/JPWO2012046754A1/en active Pending
- 2011-10-05 WO PCT/JP2011/072933 patent/WO2012046754A1/en active Application Filing
- 2011-10-05 KR KR1020137003395A patent/KR101530790B1/en not_active IP Right Cessation
- 2011-10-05 TW TW100136079A patent/TW201234056A/en unknown
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| US20070177386A1 (en) * | 2004-01-05 | 2007-08-02 | Dai Nippon Printing Co., Ltd. | Light diffusion film, surface light source unit, and liquid crystal display |
| JP2007212825A (en) * | 2006-02-10 | 2007-08-23 | Toppan Printing Co Ltd | Transmission type screen |
| JP2009265640A (en) * | 2008-03-31 | 2009-11-12 | Mitsubishi Rayon Co Ltd | Prism sheet |
| JP2010085477A (en) * | 2008-09-29 | 2010-04-15 | Dainippon Printing Co Ltd | Prism sheet, transmissive screen, and rear projection type display device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856714A (en) * | 2018-10-23 | 2019-06-07 | 友达光电股份有限公司 | The display of light leakage prevention film assembly and application the light leakage prevention film assembly |
| CN109856714B (en) * | 2018-10-23 | 2021-06-04 | 友达光电股份有限公司 | Light leakage prevention film assembly and display using same |
| CN112305647A (en) * | 2019-07-29 | 2021-02-02 | 唯亚威通讯技术有限公司 | Encapsulated diffuser |
| US11327205B2 (en) | 2019-07-29 | 2022-05-10 | Viavi Solutions Inc. | Encapsulated diffuser |
| CN112305647B (en) * | 2019-07-29 | 2024-03-19 | 唯亚威通讯技术有限公司 | Encapsulated diffuser |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012046754A1 (en) | 2012-04-12 |
| JPWO2012046754A1 (en) | 2014-02-24 |
| TW201234056A (en) | 2012-08-16 |
| KR101530790B1 (en) | 2015-06-22 |
| KR20130054339A (en) | 2013-05-24 |
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Application publication date: 20130612 |