TW200923450A - Light guide, method for manufacturing the same, and surface light source device having light guide - Google Patents

Abstract

A light guide includes a light transmissive sheet (2), a photocurable resin layer (4) which is light transmissive, and a photocurable resin layer (6) which is light transmissive. The light transmissive sheet (2) has a first surface (21) and a second surface (22), and thickness of the light transmissive sheet (2) is 200-800μ m. The photocurable resin layer (4) which is light transmissive is fixed on the first surface (21), and the photocurable resin layer (6) which is light transmissive is fixed on the second surface (22). The photocurable resin layer (4) has a mat structure on a surface thereof, and the photocurable resin layer (6) has a prism row structure on a surface thereof. The sum of average thickness of the photocurable resin layer (4) and average thickness of the photocurable resin layer (6) is less than or equal to 30 μ m.

Description

IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a surface light source used for a light source; f is a light guide member which can be used as a backlight of a liquid crystal display device. Regarding the light source device. And a surface using the light guiding member. [Prior Art] In the liquid crystal display, a surface light source used in a rectangular light guide backlight is used to mount an end surface along which the light is incident. At least one end surface of the material is used as a primary light source of a light incident person, and a linear or light incident end surface such as a straight tube type fluorescent lamp is disposed in S, and the light emitted from the primary light source is guided from the light guide. The inside of the two main surfaces 2 of the component light guiding member is emitted from the light emitting surface of the light guiding member: the two light emitting surface. In order to make the exit surface method more _, 岐 稜鏡 。 sheet. In order to reduce the power consumption, a dot-shaped lamp such as a Light Emitting Diode (LED) is used as a liquid crystal display device instead of a linear or rod-shaped lamp such as a fluorescent lamp. Primary light source. The LED can be realized in a small size. For a surface light source device using such an LED, further thinning is required. Further, as the field of use of the liquid crystal display is expanded, the size of the liquid crystal display device is further reduced in thickness. In order to respond to such a request, for the light guiding member of the surface light source device, 200923450: step: f-type 'and thickness is required to be equal to or less than the left and right r sorrow." Japanese Patent Laid-Open Publication No. 2005-228612 (1) describes a guide. Light body, thick and thick: '. Further, a plurality of concave or two-two are formed on the back surface or/and the surface. [PTL 1] The optical member described in the Japanese Patent Publication No. 2005-228612 is a polymethyl methacrylate (ΡΜΜΑ). The hopper constitutes a light control unit that describes the back surface or/and the surface by injection molding or pressing the transparent material. Therefore, :=2 and = also form a fine surface shape of the light control portion. And the solution, + ^ # other parts contact and damage. In order to solve this problem, it is considered that the graded dendritic filament surface which accurately shapes the surface of the filament and has a high hardness has a fine structure material member. . Ancient tools;,: hexa-2 resin is more or less short in the vicinity of the ultraviolet region (four). Therefore, when the color of the photocurable resin is used, the color of the color is 匕4: a backlight which is called yellowing appears in the light guiding process = display: the crystal display device is lowered, which is not preferable. In particular, when the thickness of the material is reduced, the thickness of the material is reflected by the king on the surface of the photohardenable layer in the conduction process: the number of people changes, and coloring is likely to occur. Therefore, in the thin light-guiding portion, especially for the "---the subject matter", an object of the present invention is to solve such a problem, and to provide a suitable environment for the surface of the 200923450, which can suppress coloration and is palatable. A light guiding member for a surface source device. Provided is a method for fabricating a surface light source of a light guide member of another type such as a month, and a light-transmitting sheet which is used according to the present H for achieving the above-mentioned purpose. The photo-transparent optically-transparent sheet has a first surface and a light-curing of the two surfaces 'the above-mentioned light transmissiveness; on at least the first surface of the target. The light guide (4) = has an uneven structure on the surface of the sturdy photo-curable wax layer, and has an average thickness of the photocurable resin adhered to the surface of the upper surface of the optical sheet and adheres to the light-transmissive sheet The second surface ^ The total thickness of the curable resin layer is equal to or less than 3 〇 (four). When the photocurable resin layer is not attached to the second surface, the film is adhered to the photocurable resin layer on the first surface, and is thicker than an aspect of the present invention. In the above-described aspect of the invention, at least the thickness of the above-mentioned photocurable resin layer on the surface of the above-mentioned light-transmissive sheet is less than or equal to 20 々. The concavo-convex structure is a rough wheel structure or a rib structure. The epitaxial structure of the photocurable resin layer on the i-th surface of the light-transmitting sheet is a rough surface structure, and is attached to the above-mentioned Second surface of the light transmissive sheet

C ί j 200923450 The above-mentioned uneven structure of the light-sensitive resin layer is a prism array structure. In the aspect of the invention, the thickness of the light-transmissive sheet is 2 (8) 222 ° in the sample of the present invention, 'the above-mentioned light-transmissive sheet has a size of less than or equal to IQem along the surface of the light-transmissive sheet, and the thickness is just ~ (four). In the case of the smear, the resin composition constituting the photocurable resin layer has a γι value of 2 〇 or less. In the resin of the photocurable resin layer, the YI value of the 2 mm thick of the cured resin is 2 小于 or less, and the γι (4) increase after heat treatment at 60 ° C for 500 hours is less than that. In one aspect of the ϋΓίΓ month, the 硬化ι value of the resin cured product having a thickness of 1 mm thick of 3.0 mm or less and 603 Γ 以 〇〇 〇〇 〇〇 603 603 603 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂The increase in the value of γι is less than or equal to 0.5. In the aspect of the invention, the photocurable resin layer contains oxalic acid vinegar, hexane dipropylene-based, hydrazine-modified hydrogenated Wei A butanediol dimethyl propane, butanediol Any of acrylic acid vinegar, chlorpyrifos-acrylic acid, and 2-hydroxypropyl acrylic acid is used as a constituent unit of the photocurable resin. In one aspect of the invention, it is composed of substantially filament-based fat. The above-mentioned light transmissive sheet of ft is composed of a resin which does not substantially contain benzoic acid. In the present invention, the free residual mercaptan of the above-mentioned sheet is less than or equal to 100 parts by weight. In the present invention, the above-mentioned light-transmitting sheet is composed of a resin having a polymethyl methacrylate methyl vinegar as a main constituent soap. In one aspect of the invention, the 200923450 optical sheet comprises a first light transmitting layer and a second light transmitting layer, and the first first layer is in contact with the photocurable resin layer and has a thickness of less than or equal to (10) //m 2 The second light transmissive layer is bonded to the first light transmissive layer. In the sorrow of the present invention, the ith light-transmissive layer contains a copolymer of acrylic acid vinegar and methyl methacrylate methyl vinegar. The above-mentioned acrylic acid s has a carboxyl group having a carbon number of Η. Further, according to the present invention, in accordance with the present invention, as a method for achieving the above object, a method for producing a light-emitting member for producing the above-described light guiding portion is provided. The ship of the manufacturing method consists in producing a 34-transparent sheet, coating a photocurable resin composition on at least the i-th surface of the through-sheet, and purchasing the sheet material. The shape of the transfer surface is purchased from the photo-curing composition to prepare the uneven structure, and the photocurable resin composition is cured to form a photocurable resin layer. In the aspect of the invention, The photocurable tree remainder comprises an L initiator, and the polymerization starting group molecular structure includes a benzene ring of less than or equal to 丨. In the present invention, the photocurable rouge composition The concentration of the above polymerization initiator in the present invention is the same as in the aspect of the invention, the above polymerization initiator is 〖 ♦ _ _ _ _ _ _ _ _ _ _ _ _ _ 2 2 2 2 2 2 2 2 2 2 In the case of the present invention, after the application of the photocurable resin composition, the coating is applied at 40 to 80 degrees until the photocurable resin composition is cured. The light-transmitting resin composition is light-transmitted and heat-treated. 200923450 Moreover, according to the present invention, Too, go up, provide a kind of surface light source device, the mechanism for the purpose of c, adjacent to the light guide member; the transparency of the light guide member:; = 7; The reddish member is disposed in a manner corresponding to the resin layer. The light hardening is described in one aspect of the present invention, and the above-mentioned unevenness of the grease layer is:

^ And the money hardening is described as a sinuous arrangement, and in the "state", the fish ^, f from the light emitted from the polarizing element. The χ value of the ‘ and the rate of change of the y value relative to the light guiding distance of the inner distance of the light guiding member are less than or equal to 0.0008/cin. According to the invention as described above, it is possible to easily and accurately form the surface shape by making the total thickness of the hardened layer which is adhered to the surface of the light-transmitting sheet less than or equal to 30 = m, and it is difficult to form the surface. It is known and can suppress coloring, and is suitable for use as a light guiding member of a surface light source device. The above and other objects, features and advantages of the present invention will become more <RTIgt; [Embodiment] Hereinafter, embodiments of a light guiding member of the present invention, a method for producing the same, and a surface light source device using the member and method will be described with reference to the drawings. 200923450 Fig. 1 (a) and Fig. 1 (b) are schematic cross-sectional views showing the implementation of the light guiding member of the present invention. Fig. 1 (a) and Fig. 1 (b) show longitudinal sections which are orthogonal to each other. The light guiding member includes the light transmissive sheet 2 and the light transmissive photocurable resin layer 4, and the three translucent sheet 2 has the first surface (upper surface in the drawing) 21 and the opposite side of the first surface 21 of the child. The second surface on the side (the lower surface in the drawing) 22 ° One photocurable resin layer 4 adheres to the first η of the light-transmitting sheet

On the surface 21, another photocurable resin layer 6 is adhered to the second surface 22 of the light-transmitting sheet. The light-transmitting sheet 2 preferably has a thickness of 200 to 800 βπι. The thickness of the light-transmitting sheet 2 is more preferably 300 to 700 /zm, and particularly preferably 4 to 600. The light-guiding member allows the light incident on the light incident end face to be repeated while the inner surface is totally reflected on the two main surfaces. Light guide. One of the light f actions of the inner surface full reflex 2 is coloring, that is, coloring. This coloring phenomenon remarkably appears as the number of anti-f times increases. Therefore, the number of times of total reflection of the inner surface can be reduced by reducing the number of times of the light-transmissive sheet by 2 〇〇 or more, and the light-emitting area of the surface light source device can be increased. For example, the light-emitting area is increased to 40 cm /* along the maximum dimension of the surface of the light-transmitting sheet 2, and the work stone. On the other hand, as a one-person light source used in combination with the light guiding member, you 丨+7, but the LED of the 溥 type is not used, but the size of the light-emitting portion is, for example, about 250 ##. Therefore, by making the thickness of the light-transmitting sheet 2 smaller than that of the 8〇π pen and "111' for thinning the surface light source using the small LED as described above, the secondary light source can be used. Almost all of the emitted light is used effectively in the light-emitting material, so that the light utilization efficiency can be kept high. In addition, by making the light-transmissive sheet 2 (4) obtain appropriate flexibility, money When the light guide member is manufactured at 80, the light guide member can be continuously supplied to the strip 2, and the manufacturing advantage can be obtained. ^ w The surface of the light-transmitting sheet 2 having a relatively small light-emitting area The maximum size is less than or equal to (10) in the light-transmitting sheet 2 = Γ 疋 250 to 350 ”. This is because, at this time, since the light guiding distance is relatively short, even if the thickness is reduced, the influence of coloring is less likely to be inexpensively produced by an extrusion method in which the thickness of the light-transmitting sheet 2 is equal to or less than a font or the like. In the translucent sheet 2, the concealed structure is made of a light-colored c-curable resin layer 4, 6 and a white-skinned tree, and the concavo-convex structure is made to have a mirror row parallel to each other. The configuration is a plurality of ribs, and the average thickness is defined as follows. The sheet is 〗 〖OR; 2 2 2, the entire surface of the layer of light transmissive 22 is integrated with eight, the south of the face is distributed over the surface 2 b 22 words obtained by dividing the integral value divided by the average of the surface 21; In the present invention, the total number of thousands of plants of the photohardenable tree layer 4, 6 is less than or equal to 3 〇 _, preferably less than or equal to 200923450 20 // m ' and further preferably 15 or less. In addition, at least one of the average thicknesses of the light-hardening resin layers 4 and 6 is 2 or less, preferably 10 // m or less, and more preferably 5 or less, by averaging the photocurable resin layers 4 and 6. The thickness is as described above, 艮. The thinness of the light guiding member causes the light hardening of the light guiding contact to be lightened. When the number of total reflections on the surface is increased, the light hard/elastic resin accompanying this can also be reduced. Coloring during light guiding in the layer (yellowing = correlation with the X value, enthalpy value and Z value of the money in the brightness ★ ten). Further, in the present invention, the YI value (Yellow Index, yellow index) is used to indicate the degree of yellowing. The value of γι refers to a value that is shifted from white or colorless to yellow by the value of plus (plus), which can be expressed by the Japanese Industrial Code 夂 JIS-Z8701. γ, z, and the yellowness (YI value) was obtained according to the following formula. Work = [&lt;1.28χΧ~1.06χΖ&gt;/Υ]χΐ〇〇 In order to reduce yellowing, the thickness of the photocurable resin layer is as thin as possible. Therefore, the structure in which the fine structure is not required (for example, the array structure) is preferable to I. The light-transmissive sheet 2 itself is shaped by thermal transfer or the like. When a rough surface structure is formed on one surface and a matrix arrangement structure is formed on the opposite surface, it is preferred that the rough surface structure is formed in the photocurable resin layer to have a thickness of 10 // m or less ( More preferably, the 排列 array structure is such that the ruthenium column is formed on the light-transmitting sheet by thermal transfer. Further, in order to reduce the coloring as described above, it is preferred that the sclerosing property is good. In the photocurable resin of the resin layers 4 and 6, the γ value of 1 mm thick is less than 14 200923450 and equal to 2.0. That is, in the resin mixture (resin composition) constituting the photocurable resin layers 4 and 6, the resin cured product The mm value of the bamboo value is less than or equal to 2.0. The YI deficiency is less than or equal to 15, particularly preferably less than or equal to 1.0. Moreover, it is preferred that the resin mixture constituting the photocurable tree 阙 4, 6 is a resin cured product. The YI value of the 10 mm thick is less than or equal to 3 〇. Therefore, even if the light guiding member is made thinner, coloring can be suppressed. As a constituent unit of the photocurable resin which is advantageous for such a function, it can be exemplified.

Ethylene Glycol Diacrylate (EDA), Hexanediol Diacrylate (HDDA), EO, Hydrobranched Polyethylene (HBPE), Ding Butylene Glycol Dimethacrylate (BOM), Butanediol Diacrylate (C4DA), Neopentyl Glycol Diacrylate (NPA), and 2-Phenylpropylpropyl 2-hydroxypropyl Acrylate (ΗΡΑ). Further, a polyfunctional urethane phthalate mixture (manufactured by Daiichi Kogyo Co., Ltd.: 〇GX8662V) or the like may be used, and the polyfunctional acrylamide phthalate mixture is made of Hexamethylene relative to Hexamethylene diisocyanate (Hexamethylene). Diisocyanate 'HDI) is a compound obtained by subjecting 2-hydroxy-1-propenyloxy-3-mercaptopropenyloxypropane (manufactured by Shin-Nakamura Chemical Co., Ltd.) to 2 equivalents of urethanation reaction (Urethane Tetracrylate) 'U4HA) and HDI, HDI3 (isocyanurate type), hydrazine, pentaerythritol Tetraacrylate (ΡΕΤΑ) and synthesized. These substances can function to prevent electronic transition from the 7-fluorene conjugated system of the benzene ring. That is, by obtaining the main component which does not substantially contain a stupid base, it is preferable to prevent the coloring by the support, and it is preferable that the translucent film does not contain a stupid ring on the stomach. f raw sheet = 'transparent sheet 2 free residue _ smart color square, two weight ah, better is less than or equal ^ 3 = wait for '丄: 丄 specializes in 1 PPm. Therefore, even in the case of the photocurable resin layer 4, the smear of the sheet 2 does not undergo yellowing. . In particular, from the viewpoint of coloring prevention, it is better to finish =3!: the resin of the benzene ring = the base (the base), and it means that the color of the 跃t jump will not rise. A very small amount of =. More specifically, in the present invention, the term "very small amount, preferably s2 % by weight or less" is more preferably equal to or less than 1 part by weight, and particularly preferably equal to 0.5 part by weight. Further, in the present invention, the photocurable resin 曰 = the photocurable resin used therein and the preferred enthalpy of the photocurable resin are not greatly changed by temperature. For example, it is good to use a material that does not change the YI value after heat treatment for 5 hours in a 60 〇c environment, and for a light-transmissive sheet, it is better than 6 〇〇C. The change in γ Ι value after the heat treatment for 5 hours in the environment does not exceed 0.5. In order to prevent breakage of the light guiding member, the light transmissive sheet 2 may contain 16 200923450 rubber component. Therefore, the softness of the ρ you 2 can also improve the absorbability of the sturdy sturdy sturdy slabs of the sturdy sheet 2, and thus it is difficult to break. In addition, it is strong, and therefore, the color of the coloring is easy to change. (4) The gas that is recognized is considered to be 'the content of the rubber component is preferably small, the amount of the vertical (four) t 4 is, and preferably the weight is less than or equal to 1 G. %, especially good 疋 is less than or equal to 5% by weight. Ο The strength of the SHI light member, and the effect of improving the adhesion to light, such as It:::, adhesion, etc. (giving the easy-bonding layer), for example. The material 2, the light transmissive layer formed by the upper layer 5 and the second light-transmitting layer, and the light transmissive layer of the second, second and second brothers 1 are in contact with the photocurable resin layers 4 and 6, and the upper == Bonded to the first light transmissive layer. The thickness of the first light-transmitting layer is smaller than "two 9; sweep 1 〇〇 _, and further preferably less than or equal to 75 _, especially preferably 疋 is less than or equal to 50 _. Among them, for the purpose of the first light-transmitting layer It is good (U~50 _ thin; to reduce the influence on light transmittance or film physical properties. 曰, when the photocurable resin layer 4, 6 _ is on the surface of the translucent sheet 2 and the first (2) The surface of the translucent sheet 2 is transported by the second light-transmitting layer as the substrate, and the first light-transmitting layers 204 and 206 on both sides of the light-transmitting sheet 2 are disposed on the second light-transmitting layer 2〇2. Any one of the ith light-transmissive layers 204 and 2〇6 may be formed. Alternatively, a laminate may be used without using 2. The bonding of the optical layers to each other is also possible.

It is possible to use a plurality of layers in which the light-transmissive sheet is laminated on the second substrate I without increasing the number of layers. 200923450 wherein 'the photocurable resin or the second refractive index of the photocurable resin or the second transmission layer is substantially the same, or the refractive index of the permeation layer (that is, a value greater than or equal to 挢2 of the second transmission layer). When the photo-curable resin or the second light-transmissive layer of the second light-transmitting resin is higher than a certain degree, the light-guide film: the plane waveguide structure sandwiched by the 射 射 is printed, and the low refractive index is printed. The layered shape also causes the light to be difficult to be emitted to the outside: the surface is made of a fine concavo-convex shape, so that the light hard recording layer 4, 6^ is good. In the case of the second surface, the first light guide portion 2 can be suppressed. Fig. 3 is a view showing the occurrence of the above-described guide war. Schematic diagram of the form. In the embodiment, the method of guiding the material is carried out. First, the light-transmitting sheet 2 is produced. In the figure; the work was continuously manufactured by J. The melt extrusion of the die 31 will be extruded from the desired synthesis by using the T-shape 32. The molten film 32 is cooled by a molten film 32 composed of a cooling material to be a light-transmitting sheet 2. This side is ~33, whereby the thickness of the molten film is less than or equal to 5 〇〇 &quot; m. 5, the other method of the light-transmitting sheet 2 is to form a light-transmissive sheet 2, and the thickness of the sheet 2 is more than 500 gn! The first sheet and the resin composition of the sheet 2 are coated with a photocurable photocurable resin composition on the wheel 21 of the transfer mold member 34, and the shape of the embossed surface is transferred thereto. The sheet 2 is cured by a UV lamp 35 to produce a photocurable resin, and the second surface 22 of the ultraviolet ray sheet 2 is coated with light 9 θ 4 . . Then, in the light-transmissive resin composition, the shape of the transfer surface of the printing mold member 36 was transferred to the photocurable resin composition to form a concavo-convex structure, and the light was cured by the ultraviolet lamp 37. The resin layer 4 and the light-transmitting sheet 2 are cured by ultraviolet irradiation of the photocurable resin composition to produce a photocurable resin layer 6. The light guiding member 40 thus obtained is taken out via the guide roller 38. Ο

In the polymerization initiator contained in the photocurable resin composition, the number of the benzene rings contained in the 'molecular structure is less than or equal to the reason that the photopolymerization initiator mostly contains a benzene ring. However, the smaller the number of benzene rings included in the molecular structure of the 丨, the more difficult it is to cause the yellow light of the light guiding member. As such a polymerization initiator, there may be mentioned hydroxy-cyclohexyl-phenyl fluorenone (for example, manufactured by Ciba Specialty Chemicals: gaccel 84) or 2♦ yl-2-methyl_ι-benzene Ketone (for example, j refined manufacturing: Dar () eure (7) 3). Further, the concentration of the polymerization initiator of the photocurable resin composition is preferably 0.01 to 1% by weight, more preferably j疋〇.03 to 0.5% by weight, and further preferably 0.05 to 0.1% by weight/❶. . The concentration of the benzene ring contained in the squeegee will change the color of the material.

When the concentration of the polymerization initiator in Sit is more than 1% by weight, the light guiding portion is formed. On the other hand, if the concentration of the polymerization agent is less than the weight/rhodium, the polymerization tends to be insufficient. The adhesion between the high-filament sheet 2 and the graded tree 4 is at 40 t of the optical sheet 2 and the photo-curable resin layer at the time of photohardening or before the photo-hardening step. The state of the 4-phase contact should be maintained at a daily rate! 1 is 50 to 70 degrees. Spoon 勺 spoon for more than 3 seconds. However, if the time is too long, 19

200923450 The f processing step will be longer because it is not so good (preferably, the maximum is less than or equal to 10 seconds). These times can be shortened by appropriately selecting the materials of the photocurable resin and the light transmissive sheet 2 or the light transmissive layer. By performing light hardening under such a price, it is possible to improve the adhesion from the hardenable layer to the light-transmitting sheet. If the temperature is lower than 40 degrees, it is difficult to show that the adhesion is hard. If the degree of segregation is more than 8 degrees, the film strength may be lowered and the processing may become unstable. Further, in order to improve the adhesion between the photocurable resin layer and the light-transmitting sheet, as the material of the light-transmitting sheet 2 or the second light-transmitting layer, a glass transition temperature (Tg) can be used. The material of the acrylate monomer in the north is more preferably a material having a Tg of less than 1 degree in the homopolymer. As the above acrylic material, an acrylate having a carboxyl group which is acetated with a Weib 6 alcohol is preferred. As a material which can impart an adhesion layer in particular without impairing transparency, a material obtained by copolymerizing Methl Methacrylate (_) 盥 methyl acrylate (Methyl Acrylate ' MA ) is preferred ( = Lower, also known as acrylate copolymer). The content of the MA is preferably from 5 to 20% by weight, more preferably from 10 to 15% by weight. If it is more than equal to 2% by weight, the glass transition temperature is lowered, and the physical properties of the film are not good. Further, if it is 5% by weight or less, sufficient adhesion improvement cannot be obtained at a time. Further, in order to maintain the mechanical properties of the light-transmitting sheet, the above-mentioned propylene is used as a light-transmitting sheet _ 丨 light-transmitting layer = 206. The transfer of the transfer surface of the transfer mold members 34 and 36 can be carried out in the manner of the nozzle N shown in Fig. 4 20 234 ϋ 200923450 (a), Fig. 4 (b), and the transfer mold member %% = (4). Spray the ^ composition. The transfer surface of the sprayed light-curing P-faced light-curing tree deer 3 4, 36 and the light transmission are irradiated by the transfer mold member. Further, in Fig. 4(b), φ Γ is held by the ultraviolet ray N to be injected between the transfer mold 3 and the grease composition from the discharge 嗔. The light-hardened printing surface of the injection and the transfer surface of the translucent sheet and the light transmissive property are emitted from the transfer mold member 34. Among them, if the photocurable material is taken as a line (hereinafter, it is also generally referred to as a translucent material or a light transmissive layer of the younger one, so that the above-mentioned The _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The circumferential surface == face rotation? The mold member 34 is in the form of a roll, and the outer four ports are raised to the y-shaped transfer surface. However, the present invention is not, for example, as shown in FIG. The shape of the sorrow. The face of the transfer Lai Xian 41 j read and the early face is set to shape transfer; : = : through the composition, the material line _ here. Hold the technology hardening tree month Figure 6 is to show A schematic exploded perspective view of the above-described guiding form is used. The light guiding member 4 of the upper threading device is disposed such that the kth and second surfaces of the light transmissive sheet 2 are located at 21 200923450, and the χγ surface is shaped like The surface of the in-plane surface of the crucible is adjacent to the light-conducting member (the end surface serves as a light incident end surface and serves as a source of a plurality of _ 〇. - The light-curable resin layer 4 on the surface of the light-transmissive sheet 2 of the first-order light-shield of the first-order light, and the surface of the light-transmissive sheet 2 (the surface of the layer is arranged to have a function of the surface of the layer) (4) 稜鏡 sheet 6G. On the other hand, on the second surface (lower surface) of the attached light-transmitting sheet 2, the surface of the layer is called light guide On the back side of the member), she is provided with a reflective film 70 as a light reflecting element. Ο Light portion; bf·^ED5Q, ^ light is introduced into the inner core through the light riding end face. The exit surface and the inner surface on the back surface are totally reflected to form a direction in which Γ0 is guided in the χγ plane. The rough surface structure of the concavo-convex structure of the thick tit-wei resin layer 4 on the light exit surface is emitted. The light exit function causes the light to be emitted at a desired exit rate and is again reflected by the spectroscopic reflection m7G emitted from the back side of the light guide, and the tree is turned into the light guiding member 4G. In the direction of the convex structure of the convex structure, the 稜鏡 is listed in X to convergence = so that the γζ_correction direction can be obtained to be γ = slice, 6G The lower surface (functioning as a light-incident surface) serves as a surface. The light-emitting surface of the V-light member 40 is formed by the alignment of the mV prism columns in parallel with each other with respect to the normal direction (z direction) 200923450. The light obliquely emitted in the xz plane is incident on the array of the entrance surface of the enamel sheet, and the traveling direction is deflected by substantially two directions by total reflection on the inner surface. The deflected light is self-twisted from the upper surface of the sheet 60. (Effects as a light-emitting surface). [Examples] Hereinafter, the present invention will be further described by way of examples. In addition, in the following examples and comparative examples, color coordinates X (X value and y value) and YI The values were measured as follows. [Measurement method of color coordinates (X value and 丫 value)] The surface light source of the embodiment of Fig. 6 was produced, and the χ value in the normal direction was measured using a luminance meter (τ〇Ρ_manufactured: BM7) LM. y value. The light guiding member of the light incident end surface position of the light guiding member toward the center of the light guiding member is in a direction [x direction] along the second surface of the light guiding member 4Q and orthogonal to the intersection of the light emitting end surface and the first surface. On the line C corresponding to the center line of the 4th line, the brightness meter is moved at the position of the two positions, and the X value and the gp' of the target are sequentially determined by the emitted light from the 稜鏡 sheet 60 as the polarizing element. The X value of the color coordinates and the change of the y value with respect to the light guiding distance from the light incident end surface in the light guiding member 40. Among them, in the surface light source device, white (four) (manufactured by Nissan Chemical Co., Ltd.: NSSWG57A) was used as the LED 5G, and the LEDs 5〇 were arranged at a pitch of 5.1 mm. The size of the light guiding member 4A is η? melon claw U direction) x3G7 mm (Y direction), and the thickness of the light transmitting sheet 2 is 〇.5 position. Further, the chromaticity target value and the rate of change of the y value up to the light guiding distance 12 (10) are obtained as the inclination of the least square approximation straight line. 23 200923450 [Method for measuring the yi value of photocurable resin] A circular photocurable resin sheet having a thickness of 1 mm and a diameter of 6 cm was prepared as a sample for YI value measurement using an automatic spectrophotometer (manufactured by Hitachi: U- Model 3500) was used to determine the YI value. The background value correction was performed using the state without the sample as a base, and the YI value at the time of using the sample was obtained. At the time of preparation of the sample for evaluation, a metal halide lamp electrodeless bulb D (FUSION LH-10) was used as the ultraviolet irradiation device, and the use was performed at 60% of the output. The xenon lamp is a three-lamp lamp with 24 〇 w/cm power (1 〇〇% round). The distance between the ultraviolet irradiation device and the sample was 53.3, and the photocurable resin was subjected to UV irradiation for 5 J seconds, which was measured by an illuminance meter to be 1 〇〇〇mJ/cm 2 (3 〇 mJ/cm 2 ). Polymerize to make a sample. Further, after the sample was left for one week after photopolymerization, the YI value was measured. The sample preparation conditions or the uv energy exposure amount or the sample placement time affect the subsequent γι value, so it is necessary to make the conditions always the same and measure the Yj value. [Example 1]

Ppm;, using each of the transfer mold parts, free residual mercaptan about 10~20 by the above photocurable resin 24 200923450

光 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Arranged structure, stone 'raw resin layer 6. As a device for irradiating ultraviolet light for photohardening, a metal halide lamp electrodeless lamp D bulb (FUSION LH-10) is used, and a power of 4 〇 = 5 〇〇 /° is used for each xenon lamp of 240 W/cm. (100% output of three lamps. The distance between the ultraviolet irradiation device and the sample is 53.3 cm, and finally the photopolymerization is carried out by irradiating the sample with a month b of 200 to 30 Θ mJ/cm2 measured by an illuminance meter, using photocurable resin. The uneven structure of the both surfaces is provided. The average thickness of the photocurable resin layer 4 is 4, the average thickness of the photocurable resin layer 6 is 6 // m, and the total thickness of the photocurable resin layers 4 and 6 is 1 in total. The light guide member of the crucible. The result of measuring the YI value of the photocurable resin layers 4 and 6 is ί ο. manufactured by Mitsubishi Rayon: UK-6074 (40 w%) [Chem. 1]

[Chemical 1] 〇 CH^CHCOCHg 0 CH2»CH0〇C^0- 0 CHgO-C-N-0121 O^CHOCX^

0 H N—C i ii H 0

Xinzhongcun Chemical Manufacturing: UJPPA (20 wt%) [Chem. 2] 25 200923450 H ^ CH3 N - CO- CHCH2〇CXX&gt;l«CH2 [Chemical 2]

Ch3 ch3 V ? ? «3 CHs CH2-N-CO-CHCH2〇COCH»CH2 Manufactured by Mitsubishi Rayon: PBOM (40 wt%) [Chemical 3] f 9^3 9^3 [Example 2] The photocurable resin layer 4 having a rough surface structure has an average thickness of 5 // m′, and the photocurable resin layer 6 having an array structure has an average thickness of 10 //m 'the photocurable resin layer 4 A light guiding member was produced under the same conditions as in Example 1 except that the total thickness of 6 was 15 μm. [Example 3] The average thickness of the photocurable resin layer 4 having a rough surface structure is 10 Adm' The average thickness of the photocurable resin layer 6 having a prism array structure is 10 // m, and the photocurable resin A light guide member was produced in the same manner as in Example 丨 except that the hinges of the average thickness of the layers 4 and 6 were 20 //m. [Comparative Example 1] The average thickness of the photocurable resin layer 4 having a rough surface structure is 26 200923450 16 &quot;m, and the average thickness of the photocurable resin layer 6 having the prism array structure is 27 μm, light A light guiding film was produced under the same conditions as in Example 1 except that the total thickness of the curable resin layers 4 and 6 was 43 //m'. [Example 4]

'Polyethylene glycol 200 diacrylate resin (PEDA 2 〇〇) was used as a photohardening 141⁄43⁄4 ' in which G 5 * was mixed. /. Irgaeure 184 was used as a starting initiator, and the mixture was subjected to uv hardening, and used as a concavo-convex structure of the light guiding member: to impart a photocurable resin. The uneven shape transfer is a film of a thickness of 5 GG using a polymethyl methacrylate (PMma) as a main raw material by extruding a v, and is used as a translucent sheet 2 (free residual mercaptan)

〜20 ppm), using a mold, the fine 14 structure is transferred on one surface by the photocurable resin, and a plurality of structures extending in a direction perpendicular to the light incident end surface are transferred on the back surface of the crucible稜鏡 Construction. The light guiding members having the average thickness of each of the photocurable resin layers on the secret surface of 5 m in the crotch portion and 10 _ in total, and 15 (four) in total were produced. Further, when the YI value of the present resin was measured, the result was 〇.7. The change of the χ value and the y value of the color coordinates with respect to the light guiding distance q and the total of the average thickness of the photo-curable f resin layers 4 and 6 in the above-described Example 1 to Cut and Comparative Example The value and the slope of the y value (rate of change per cm) are shown in Fig. 7~u and Table 丨. As seen in the results, when the average thickness of the photocurable resin layers 4, 6 and the light guiding portion are yellowed. In general, if the rate of change of the x, y coordinate value of 200923450 is large, the change in color tone in the same light guiding member will be visually observed. [Example 5] A PMMA towel was used to copolymerize 7 wt% of a tender material as the optical sheet 2, and a diol diacrylate resin (hdda)- was used as a photocurable resin, except that completely The same as in the fourth embodiment. The YI value at this time is Μ. As shown in Table 1, the rate of change of the X value and the y value is small, being 0.00041 and 0,00039 per 1 cm, respectively. [Example 6] A material in which 12% by weight of MA was copolymerized in PMMA was used as the light-transmitting sheet 2, and E-modified nitriding bisphenol A diacrylic acid vinegar (HBPE) was used as photocurability. The resin was completely the same as Example 4 except for the above. The YI value at this time is 〇 7, as shown in Table}, the rate of change of the χ value and the value of ^ is small, which is 〇. (10) 〇 39, 〇 〇〇〇 38 per cm. [Example 7] Using a layer obtained by copolymerizing pmmA and 18% by weight of MA in the lower 30 / zm above, a coextrusion of a layer of PMMA1〇〇0/(^44〇 thickness) was sandwiched. The light transmissive sheet 2 and the p-iybutylene Glycol Dimethacrylate 'PB0M) were used as the photocurable resin, and the same as in Example 4. The γι value at the time is 〇·8. As shown in Table 1, the rate of change of the X value and the y value is small, and is every 45 〇〇〇〇 45, 〇〇〇〇 42. [Example 8] The polymerization start A light guiding film was produced under the same conditions as in Example 3 except that the amount of the compound was changed to wt%. 28 200923450 [Example 9] The mixing amount of the polymerization initiator was set to U25鲥%, The light guiding film was produced under the same conditions as in Example 8. In addition to the above, the X values and y_ with respect to the light guiding distance in the above Examples 8 to 9 were changed and compared with the light hardness = color. The total x value of the average thickness of the coordinates and the slope of the ¥ value (the rate of each of the meniscus layers 4 and 6) are shown in Figures 12 to 13 and Table 分别, respectively. In the same manner, the crossbar is the light guiding distance Ω r , the middle ' and the results of the third embodiment, the third and the eighth, and the results are shown in Fig. 7. The poly = only. The smaller the amount (concentration), the X value and the y The value of the change = the mixture [Table 1] D = ~ and the smaller. The total thickness of the lipid layer is equal [/zm] The polymerization initiator temperature [wt%]

------1---丄[Determination of YI value of main component of photocurable resin] A photocurable resin sheet having a thickness of 2 mm and 1 cm square was prepared for use as a sample for YI measurement, and automatic spectrophotometry was used. Instrument (Hitachi manufacturing: the secret is the type) to enter the Y f YI value. The (4) of the finished product is used as a silk foundation to enter the background value correction of the lamp, and the γι value when the sample is used is obtained. In the production of the evaluation sample, a metal halide lamp electrodeless lamp D bulb (fusi〇= 29 200923450 LH-10) was used as the purple ray line irradiation device, and each lamp was used with a 60% output. Three lamps with 240 W/cm power (100% output). The distance between the ultraviolet irradiation device and the sample was 53.3 mm, and finally the sample was subjected to UV irradiation of 5.7 seconds of energy measured by an illuminance meter of 1000 mJ/cm 2 (±30 mJ/cm 2 ) to carry out polymerization of the photocurable resin. sample. Further, after the sample was left for one week after photopolymerization, the measurement of the YI value was performed. Further, the heat treatment was carried out by using a thermostat, and the sample was allowed to stand in an environment of a temperature of 60 ° C for 500 hours, followed by measurement of the YI value. Sample preparation conditions or UV energy exposure or sample placement time will affect the subsequent YI values, so the YI values must be determined by making these conditions the same. By using the above-mentioned method, 0.1 wt% of a polymerization initiator (manufactured by Ciba Specialty Chemicals: Irgacure 184) was mixed with each of the polymerization monomer liquids described in the following Table 2 as a main component of the photocurable resin. The mixture was subjected to UV hardening, and the results obtained by measuring the YI value are shown in Table 2. Further, an example using an amino phthalic acid acrylate having a polypropylene skeleton (manufactured by Roots Industrial Co., Ltd.: MPU11) is shown for reference. [Table 2] The polymerization solution monomer liquid YI value after heat treatment for 1 week, GX8662V 1.6 1.4 U4HA 1 1.1 PBOM 0.7 0.7 NPA 0.7 0.8 HDDA 0.8 0.8 c4da 1.6 1.8 MPU11 0.9 3.1 [Determination of YI value of photocurable resin mixture] 30 200923450 A circular-shaped photocurable resin film having a thickness of 10 mm and a diameter of 6 cm is produced as a sample for measuring the YI value, and an automatic spectrophotometer (manufactured by Kyoritsu: U-3500) is used to measure the YI value. . The background value correction is performed based on the state without the sample, and the ΥΙ value when the sample is used is obtained. In the preparation of the sample for evaluation, a metal halide lamp electrodeless lamp D bulb (FUSIONLH-10) was used as the ultraviolet irradiation device, and the power was 240 W/cm per lamp with a 60% output (1〇〇). Three lights when % is output. The distance between the ultraviolet irradiation device and the sample was 53 3 mm, and finally the sample was subjected to UV irradiation of 8.6 seconds of energy measured by an illuminance meter of 1500 mj/cm 2 (±3 μm/cm 2 ) to carry out polymerization of the photocurable resin. Take out the sample. Further, after the sample was placed for a week after photopolymerization, the YI value was measured. Further, the heat treatment was carried out by using a thermostat, and the sample was allowed to stand in an environment of a temperature of 60 ° C for 500 hours, and then the measurement of the γι value was carried out. The sample preparation conditions or the UV energy irradiation amount or the sample placement time may affect the subsequent YI value, and therefore it is necessary to make the conditions always the same and measure the YI value. [Example 10] 0.1% by weight of a polymerization initiator (manufactured by Ciba Specialty Chemicals: Irgacure 184) was mixed with a polymerization monomer liquid composed of a mixed liquid composed of a photocurable resin having the following composition. The mixture was subjected to uv hardening to obtain a sample for measurement. Xinzhongcun Chemical Industry (4) Manufacture: U4HA (1Qw%) 9 200923450 [Chemical 4] &gt;OCC(i CH2= (CH3)CHCOCH2 CH2〇CC(CH3)=CH2 •CHoOCCH-CH2 o ch2=chccch2 〇Mitsubishi Riyang Manufacturing: PBOM (40 wt%) [Chemical 5] [Chemical 5]

CH3 CH3 CH2^CCOO(04HbO)9COC^OH2 Manufactured by Mitsubishi Rayon: HDDA (50 wt%) [Chem. 6] 化ο II Ιί ch2=chc〇一c6h12—〇cch=ch2 [Example 11] A sample for measurement was obtained in the same manner as in Example 10 except that the ratio of U4HA was 20 W% and the ratio of PBOM was 30 Wt%. [Example 12] The ratio of U4HA was set to 30 w〇//°, and the ratio of PB0M was set to 20 wt°/. Except for this, a sample for measurement was obtained in the same manner as in the examples. [Example 13] 200923450 The ratio of U4HA was set to 20 w%. The same procedure as in Example 10 was carried out except that the ratio of PBOM was 20 wt%/〇, and the ratio of HDDA was 60 wt%. A sample for measurement was obtained. [Example 14] The ratio of U4HA was set to 30 w%, and the ratio of PBOM was set to 30 wt ° /. A sample for measurement was obtained in the same manner as in Example 10 except that the ratio of HDDA was 40 wt%. [Example 15] The same ratio as in Example 10 was carried out except that the ratio of U4HA was set to 1% w%, the ratio of PBOM was set to 4% by weight, and yttrium was used in place of HDDA at a ratio of 50% by weight. The sample for measurement was obtained by the method. [Example 16] A sample for measurement was obtained in the same manner as in Example 10 except that GX8662V manufactured by K.K. Pharmaceutical Co., Ltd. was used instead of U4HA in a ratio of 10 wt%, and the ratio of PBOM was changed to wt%. [Reference Example 1] The same procedure as in Example 10 was carried out except that the ratio of U4HA was 1 〇 W%, the ratio of PBOM was 40 wt%, and the ratio of HDDA was 40 wt%. Sample for measurement. With respect to the samples for measurement obtained in the above Examples 10 to 16 and Reference Example 1, the results obtained by measuring the YI value are shown in Table 3 below. 200923450 [Table 3]

~J--LiP L_._J_-Ϊ2~~ H was prepared by the same method as in Example 1 using the optical resin having the compositions of Examples 1G to 16 and Reference Example 1 described above. In the history of _1, a light guiding member can be produced by the method of the embodiment i. As is apparent from the present invention, according to the present invention, a conductive material which is extremely thin and has excellent color characteristics, particularly for use as a surface light source device using a human-light source for L E D can be obtained. Further, by using the transfer mold member, the shape transfer is carried out by continuously using the photohard i resin, whereby a light guide member which is excellent in productivity and relatively inexpensive can be produced. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. This is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1(a) and FIG. 1(b) are schematic cross-sectional views showing the embodiment of the light guiding member of the present invention. Fig. 2 is a schematic cross-sectional view showing an embodiment of a light guiding member of the present invention. ^ σ Fig. 3 is a schematic view showing an embodiment 34 200923450 of a method of manufacturing the light guiding member of the present invention. Fig. 4 (a) and Fig. 4 (b) are explanatory views of the transfer of the shape of the transfer surface of the transfer mold member. Fig. 5 is an explanatory view of the transfer of the shape of the transfer surface of the transfer mold member. Fig. 6 is a schematic exploded perspective view showing an embodiment of a surface light source device using the light guiding member of the present invention. Fig. 7 is a view showing changes in color coordinates x and y with respect to the light guiding distance q. Fig. 8 is a view showing changes in color coordinates x and y with respect to the light guiding distance q. Fig. 9 is a view showing changes in color coordinates x and y with respect to the light guiding distance q. Fig. 10 is a view showing changes in color coordinates X and y with respect to the light guiding distance q. Fig. 11 is a view showing changes in color coordinates X and y with respect to the light guiding distance q. Fig. 12 is a view showing changes in color coordinates X and y with respect to the light guiding distance q. Fig. 13 is a view showing changes in color coordinates X and y with respect to the light guiding distance q. [Main component symbol description] 2: Translucent sheet 4, 6: Photocurable resin layer 21: First surface 35 200923450 22 Second surface 31 T-shaped mold 32 Melt film 33 Cooling rolls 34, 36, 41: Transfer Molding members 35, 37: ultraviolet lamps 38, 42' 44 : guide roller 40 light guiding member 50 LED 60 稜鏡 sheet 70: reflecting film 202: second light transmitting layer 204, 206: first light transmitting layer C: line N: ejection nozzle LM: luminance meter 36

Claims (1)

200923450 X. Patent application scope: Kind of light. A coffin having a light transmissive sheet and a light transmissive layer, wherein the translucent sheet has a first surface and the first sound: the photocurable resin crucible having a light transmissive property on the second surface At least the glazing member of the upper nucleating sheet is characterized in that: the photocurable resin layer has a concavo-convex structure on the surface of the above-mentioned π, and the one on the first surface of the permeable sheet The total thickness of the light hard fat layer and the average thickness of the photocurable resin layer adhered to the above-mentioned surface of the light-transmitting sheet are less than 30 //m', and the towel is not attached to the second surface. When the photocurable resin layer is present, the total thickness is attached to the above-mentioned first! The average thickness of the above photocurable resin layer on the surface. The light-guiding member according to the first aspect of the invention, wherein the photocurable resin layer adhered to the ith surface of the light-transmitting sheet and the first layer adhered to the light-transmitting sheet At least one of the photocurable resin layers on the surface of the second layer has an average thickness of 2 Å or less. The light guiding member according to claim 1, wherein the uneven structure is a coarse sugar surface structure or a matrix arrangement structure. 4. The light guiding member according to the third aspect of the invention, wherein the uneven structure of the photocurable resin layer adhered to the first surface of the light-transmitting sheet is the rough surface structure and adheres The uneven structure of the photocurable resin layer on the second surface of the light-transmitting sheet is the prism array structure. The light-transmitting sheet of the above-mentioned light-transmissive sheet has a thickness of 200 to 800 β111. 6. The light guiding member according to claim 1, wherein the light transmissive sheet has a maximum dimension of 1 〇 cm or less along the surface thereof and a thickness of 100 〜500 am. X 7. The light-guiding member according to the first aspect of the invention, wherein the resin composition constituting the photocurable resin layer has a YI value of 2.0 or less in the one-claw thickness of the cured resin. 8. The light guiding member according to the first aspect of the invention, wherein, in the resin main component constituting the photocurable resin layer, a YI value of a 2 mm thick resin cured product is 2.0 or less, and is 6 〇t: The increase in the YI value after the heat treatment for 5 hours was 0.5 or less. The light-guiding member according to the first aspect of the invention, wherein the resin composition constituting the photocurable resin layer has a YI value of a surface thickness of the cured resin of less than or equal to 3.〇, and U 6〇 The increase in the YI value after the heat treatment for 500 hours at ° C is 0.5 or less. The guide member according to any one of the preceding claims, wherein the photocurable resin layer contains ethylene glycol diacrylic acid, and the modified hydrogenated vinegar Double test bismuth diacetate, C::: methyl enoate, butanediol diacrylate, neopentyl glycol II =:::: single base: any one in the base of the propylene wheel, The first hardenable resin described in the first paragraph (1) of the patent is a tree which is substantially free of a phenyl group. 38 200923450 12. The light-transmitting transparent sheet according to the above-mentioned claim It is a resin structure which does not substantially contain a benzene ring &gt; 'In the above 13. The light-transfer sheet of the light-transmissive sheet is less than or equal to 1 〇〇 /, as described in the scope of the patent application. In the middle of the above,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, The pre-positioned tree f U 15. The light-guiding member according to the patent application, wherein the translucent sheet comprises the first light-transmissive layer and the second light-transmissive layer, and the first light-transmitting layer and the photo-curing layer Contact layer thickness = 2 100 //m, the second light-transmissive layer is bonded to the above-mentioned ith layer, temple; 16. The light-transmitting portion of the first light-transmitting layer A copolymer comprising __ and f-based acrylonitrile, wherein the acrylate has an esterification of an alcohol having 1 to 6 carbon atoms. A 17. A method of producing a light guiding member for producing the light guiding member according to claim 1, wherein the manufacturing method is characterized by: &amp; forming the above through melt extrusion or casting polymerization The optical sheet is coated with a photocurable resin composition on at least the i-th surface of the light-transmitting sheet, and the shape of the transfer surface of the transfer mold member is transferred onto the photocurable resin composition to The photocurable resin material according to the seventeenth aspect of the invention, wherein the photocurable resin is produced by the method of producing the light-curable resin composition, wherein the photocurable resin composition is cured. The composition comprises a polymerization initiator, the above-mentioned 39 200923450! Polymerization start _] molecule (10) contains a material that is less than or equal to = the scope of the patent application of the scope of the invention is described in item 8 of the invention. The polymerization initiator in the resin composition has a /length of from 0. 0 to 1% by weight. For example, the manufacturer of the light guiding member described in the application of the patent (4) 18 "its \ ΐ 聚合 polymerization initiator is w paint cyclohexyl phenyl fluorenone or - search base-2-methyl small phenyl - propyl small The ketone. 21. The manufacturer of the light-guiding member according to the above-mentioned patent application 帛17", after the application of the photocurable resin composition described above, until the upper ray is made to be more The light-transmissive sheet coated with the photocurable resin composition described above is heat-treated at a temperature of ~degree. 22. A surface light source device, comprising: 申. The light guiding member according to the first aspect of the invention, wherein: the primary light source disposed adjacent to the end surface of the light guiding member; and the first surface of the light transmissive sheet attached to the light guiding member The photocurable resin layer is a polarizing element disposed in a manner opposite to the above. The surface light source device according to claim 22, wherein the uneven structure of the photocurable resin layer adhered to the first surface of the light-transmitting sheet is a rough surface structure The photocurable resin layer is also attached to the second surface of the upper surface of the sheet, and the concavo-convex structure of the photocurable resin layer is an array structure. The surface light source device according to claim 22, wherein the X value and the y value of the color coordinates measured by the emitted light from the polarizing element are opposite to the end surface of the light guiding member. At least one of the rate of change of the distances of the light guiding distances is less than or equal to 〇.〇〇〇8/cm.