TW200832001A - Optical flat plate member and method for manufacturing optical flat plate member - Google Patents

Abstract

This invention provides an optical flat plate member produced by injection molding a thermoplastic resin using a mold having a gate within an optically effective plane. This optical flat plate member comprises a first plane with a gate mark and a second plane which is a plane opposite to the first plane. The first and second planes satisfy requirement 1: 1 (μm) < RA1 = 3 ([μm), Ra2 = 3 ([μm) and Ra1 = Ra2, or requirement 2: Ra1 = 1 (μm) and Ra2 = 3 (μm), wherein r1 represents the radius of the gate mark present within the optically effective surface in the first plane; Ra1 represents the arithmetic mean roughness of the gate mark in the first plane; and Ra2 represents the arithmetic mean roughness, in the second plane, in an area with a radius r2 (r2 = r1 x 30) with a point, as its center, corresponding to the center of the gate mark in the first plane.

Description

200832001 IX. OBJECTS OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION The present invention relates to the use of the optical inch 冓 冓 日 日 日 日 日 日 痕迹 痕迹 痕迹 痕迹 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热 热A flat member and a method of manufacturing the optical flat member are used. [Prior Art] A liquid crystal display device which uses a voltage to apply a voltage to change the number of molecules to change liquid crystals is widely used in personal computers, thin televisions, vehicle panels, mobile information terminals, and the like. Since the liquid crystal display itself does not emit light, the liquid crystal display device requires an external light source. As the light source, there is a side light mode in which the light source is disposed on the side edge of the liquid crystal display device, and a direct light mode in which the light source is disposed in the moon port f of the liquid crystal display device. The person is put to practical use. Although the side light method can make the device unit thin, since the brightness is low, a large liquid crystal display device requiring high brightness is suitable, and the direct type is suitable. Further, in the side light type and the direct type, the optical flat member composed of the thermoplastic resin exhibits an important function, and in particular, a light diffusing plate is used as the optical flat member in a straight down manner. In the liquid crystal display device of the direct type, a plurality of light sources such as cold cathode tubes are disposed on the back of the device casing, and light from the light source is incident on the light diffusing plate, and the incident light is diffused by the light diffusing plate to convert the light into uniform brightness. The light of the face. If necessary, a reflector can be placed behind the cold cathode, a gradient printing is applied to the back of the light diffusing plate, and a light collecting sheet, a diffusion sheet, and the like are stacked on the front side of the light diffusing plate. In the light diffusing plate, the balance between light transmittance and light diffusivity is required, and there is no recursion.

2246-9221-PF 5 200832001 The intensity of the points makes the brightness halo less.

The material of the light-diffusing sheet is formed by using a thermoplastic resin containing a light-diffusing agent. However, there are cases where only a thermoplastic resin is used, and the surface of the molded article is t-shaped. The forming method of the light-diffusing sheet can be carried out by an extrusion molding method or an injection molding method. In the extrusion molding method, although the raw material sheet of the light diffusion plate can be efficiently produced, the processing of the light diffusion plate becomes a waste of material. In the case of flood casting, it is possible to obtain a light-diffusing sheet having high strength without optical skew, but the productivity is not high. In the case of injection molding, the number of steps of post-processing is small, and the light-diffusing sheet can be produced in a short time. However, the method of 'melting thermoplastic resin flowing from the side gate of the side surface of the cavity is the single light diffusion plate. It is technically difficult to manufacture the "manufacturing of the injection molding method" and the multi-faceted injection molding method of the small light diffusion plate.

For this reason, Japanese Patent Application Laid-Open No. 2004-1 1544, the entire disclosure of which is incorporated herein by reference. According to this, it is possible to manufacture a single-sided injection molding method for a large-sized light-diffusing sheet, and to manufacture a multi-faceted injection molding method for a small-sized light-diffusing sheet: using a mold having a hot runner and a multi-point gate, Single-sided take-up: a small-sized light diffusing plate with a loose plate and a multi-faceted surface, which is formed by short molding. However, in the mold of the precision molded product such as the light diffusing plate, the inflow of the molten resin to the mold cavity is finished, ..., ^ ee „3 .. , Jun's valve is closed by the valve inspection By transferring the front end of the valve plug J~ into the optical effective surface, no need for the gate mark (1), so that the 2246-9221~pp 6 200832001 0 / / with a shaped light diffuser I in the liquid crystal display set low display picture of the book of the question, ^ 儿军, there is a drop BS - negative question, requires further improvement of the step. So 锞: two is not limited to the light diffuser, it is guided Other optical members such as a light plate are also produced in the same manner. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a use of a flattening member for optical use which is inconspicuous in suppressing brightness halos, and: An optical flat member manufactured by injection molding of a resin and a method for producing an optical flat member. - The present inventors' research on the above-mentioned problems, the result of which is the result of the research, and the arithmetic mean coarse winding of the slab trace of the optical flat member Degree I: with >口 户 户 ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ The gate mark of the flat member used in the apparatus for sleeping water is not obvious, and the present invention has been completed according to the knowledge. In particular, according to the first aspect of the present invention, a flat member for optical use is provided. A thermoplastic resin is used for injection molding of a mold having a mouthwash corresponding to an optically kneaded surface, and includes: a first ® having a mouth mark formed in response to the washing; and The surface of the opposing side is 'on the first side', and the radius of the above-mentioned Π trace existing in the optical effective surface is n, and the arithmetic mean roughness of the range of the radius η is Ra&quot; The above "in order to correspond to the above Ρ

224 6-9221-PF 7 200832001 Γ2(γ2 = πχ30) and Rai S Ra The surface of the above-mentioned gate mark is the center of the half of the range where the arithmetic mean roughness is I, which is wide (condition 1) : Ge (condition 2), and Ra2g3Uro). In the optical flat member of the present invention, ^ η, ^ thousand pairs are present on the side of the gate mark. The total light transmittance is preferably 50 to 90%. &amp; Moonlight is preferably used for a light diffusing plate. Further, according to the second _ κ of the present invention, there is provided a method for manufacturing an optical flat member according to the present invention, which is a method for manufacturing a flat member for optical use according to the present invention, which comprises: using a heat flow including a floodgate The mold of the road is injection molded. According to the present invention, the use of the (four) mouth mark as the optical material (four) member does not inhibit the brightness halo. Further, it can be easily produced by injection molding of an optical flat plastic resin. [Embodiment] Hereinafter, an explanation will be given of an optical flat according to an embodiment of the present invention. The sheet member for optics according to the present embodiment is obtained by injection molding a ruthenium plastic resin into a mold having a mouth in the surface of the optically effective surface of the optical sheet member. The optical member 'includes a first surface in which a mouth mark formed in correspondence with the above-mentioned winding is present, and a second surface which is a surface opposite to the first surface, and is located on the first surface, 2246-9221-PF 8 200832001 The radius of the above-mentioned flooding trace existing in the optical effective plane is ri, and the arithmetic mean roughness of the surface in the range of the rich control η is Ra, and on the second surface, the corresponding first surface, The point of the center of the trace is the radius r2 of the center (r2==nx3〇). The average number of the noses of the 5th surface of the section is R (four), which satisfies the following (Condition 1) or (Condition 2) Ground setting. (Condition 1) iUn〇aai$3(//m), and 3( β , and Rai^ — (Condition 2)

RadlUm), and Ra2^3(//m) is the slab member for δ ray optics, which is slanted on the side of the side where there is a gate mark (different face 1). The light tooth permeability is 50 to 90%, preferably 60 to 90%. In this case, the optical effective surface is used when the prior art member is incorporated into a liquid crystal display device or the like, and the observer can confirm that nl丄μ# is made/u &lt; The side of the main surface is part of the assembly of the liquid crystal display device. ▲In addition to the surface of the mold for forming the flat member for forming optics, which is the surface corresponding to the optically effective surface of the flat member for optics, a plurality of submerged ports are provided to set the number of the nozzles to be N (pieces), and the optical When the area of the flat member is s(-2) and the thickness of the flat member for optics is t(_), the number of gates N is preferably the following (formula 1), and it is more preferable to satisfy the following (formula 2). (Formula 1) (S/(U6))xmN$(2S/t)xl〇—4 2) (S/(t + 4))xl〇-^N^ (2S/t)xl〇-Number of washes N is not full (S / (t + 6)) x l 〇 'then the molten resin in the mold

2246-9221-PF 9 200832001 The L-distance is too long, and the temperature of the molten resin in the flow is lowered, and it is caused by the skew of the plate member, the thickness of the halo, the mold line, and the like. ^ When the number N exceeds (2S/t) Xl 〇 -4, the number of gates becomes too large, and the cookware is made. Further, the optical flat plate of the present embodiment is preferably 15 or more, i.e., the area is 76,000 mm 2 or more, and the area is 18 G or more, and GGG mm 2 or more is more preferable. When 椹 个 权 取 取 取 取 取 取 取 取 取 取 :: :: :: 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学 光学The range of .2, _ is suitable for the optical plate member. The arithmetic mean coarse optical effective surface of the slab trace is used in the optical flat member. 1=:?Γ: The shape of the shape refers to the plane of the mouth mark (half 艮 _, and when there is a specific shape forming a fine, such a subtle specific shape ^ 粗 ^. by this subtle specific The specific shape of the shape of the first trace of the shape of the first turn is formed. If there is a specific shape of the flat member other than the trace of the surface of the trace of the Taokou, the trace is formed with the trace of the wound Forming a subtle specific shape. The subtle ' of the 卩 卩 在于 在于 在于 在于 在于 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 The point at the center of the mouth mark is such that the radius η is the arithmetic mean roughness of the range of the species (4), and when a plurality of fine::疋 shapes are formed on the surface (the second surface) of the optical flat member for the light diffusing device 'refers to the formation of the subtle specific shape The arithmetic mean (fourth degree) of the range is the arithmetic mean roughness of the range of the surface of the optical flat plate Z when the surface of the optical flat member (second:) does not form a fine specific shape. The specific shape of such a fine shape is the surface of the stencil included in the fixed mold 4 (refer to FIG. 7) of the 饴H, 々pa, and the cooker described later, and the 彡 is formed into a corresponding specific shape, which is fine The specific shape that is broken is transferred to the resin to form. The specific shape of the (four) mouth mark or the optical plate member is as follows: as shown in the cross-sectional view of Fig. 1, it can be expanded into an optical plate. The member of the bull-shaped prism (the triangular 稜鏡 section is a three-dimensional prism column shown by R1 in the line shape of the triangular shape. At this time, the arithmetic mean roughness of the surface forming the / 一 mirror is measured." 'The cross-sectional view of Fig. 2 shows the triangle 稜鏡 to form: 2 slanting faces of the horns, and the angles formed by the squatting scorpion _ angles are equal:: learning ^^... points, and two ::The angle and the optical plate member are separated from the gamma point Between, the two sides are separated from the established distance from the small ground. At this time, the 1 and γ points are separated: the average roughness is changed continuously or in stages. 7. In the figure, R2 is not triangular. The line of the at least L::::; is a composite rafter column formed by a 4-sided polygonal shape.

224 6-9221-PF 11 200832001, the measurement is shown in the figure; ^复# # Set the average roughness of the σ 夂 mirror surface. When the shape of the slab at the top of FIG. 1 to FIG. 3 is formed, when the optical plate member is used to observe the gate mark on the light source, the trace of the mouth is poured upward, and the trace of the gate becomes very large. obvious. Therefore, the funeral work is given to the good surface (four degrees) shown in this embodiment, and the traces of money σ are not easy to see. Further, as shown in the cross-sectional view of Fig. 4, the cross-sectional view is a convex-arc shape; At this time, the arithmetic mean coarse _ of the face of the cylindrical mirror-shaped ridge which is convex 0-shaped as shown by R4 in the figure is measured. Further, as shown in the cross-sectional view of Fig. 5, the rock ^ ^ 』 is a shape in which the spherical protrusions are arranged in the longitudinal direction and the lateral direction. At this time, Fengka ° ten / then 幵 / into the picture shown in R5 m gentleman ten average thick ^ degrees. When the shape of FIG. 4 and FIG. 5 is not formed here, the optical plate e4, ^^, and the sputum are placed on the source to observe the gate trace. The trace of the temple will be enlarged, and the snail will be enlarged. There are obvious traces of the nine stools. Therefore, the traces of hunting indicated by the form given to the present application are not easily seen. The surface roughness of the good child can be such that the washing 816 does not have the shape of a polygonal pyramid-shaped protrusion such as a quadrangular pyramid. At this time, the measurement of m Λ Dp 夕 锥 锥 公 公 7 7 7 7 7 7 7 7 7 7 7 7 R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R Further, the quadrangular pyramid or the like is formed into a polygonal pyramid-shaped depression or the like. When the shape shown in Fig. 6 is used to observe the trace of the mouth, the method is applied to the light source by the flat member.

The traces of the inch will appear to be divided into P by giving the 浐々 夂 + s knife clothing, which is more obvious. Therefore, the good mouth marks shown by the shape of the yoke are not easy to see. *Face thick ‘degree, can be poured

Further, the arithmetic mean roughness Ra' is a value defined by Japanese Industrial Standard JIS 224 6-9221-pp 12 200832001 BO 6013.1, and can be measured using an ultra-deep microscope or the like. Further, when the optical flat member is disposed at a position facing the light source, the gate trace may be provided on the light source side of the optical flat member or on the opposite side of the light source.

The thermoplastic resin to be used in the embodiment of the present invention is not particularly limited, and examples thereof include copolymerization of a resin having a lipid raft structure and copolymerization of an aromatic vinyl monomer (mercapto) acrylic acid oxime group. , methyl propylene baking acid resin, polycarbonate, polystyrene, acrylonitrile-styrene copolymer resin, m resin, polyether stone, and the like. Among these, a resin having an alicyclic structure, a copolymer of a sulphur-based ethylene monomer and a (meth)acrylic acid-based vinegar-based monomer, and a polycarbonate have a low water absorption rate and are strong. Therefore, it can be used well. Since the resin having an alicyclic structure is excellent in fluidity of the shale resin, it can be == ink filled in the cavity of the mold' because the hygroscopicity is extremely low, so that it does not cause recursion in the optical flat member, Ratio = Therefore, the optical flat member is lightweight. χ, the tree 曰 具有 with the structure of the alicyclic ring is not easy to produce a mold line. The resin that is manufactured refers to the main chain or the side chain: Among them, the main chain has an alicyclic structure, and the degree and heat resistance are good. Therefore, it is particularly suitable for making a strong smoke structure. The carbon number is preferably 5 to 15 in (4) and ring. The 丨 环 具有 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨 丨single

224 6-9221-PF 200832001 Copolymerization-added argon, a core polymer of a raw ice conjugated diene monomer or a hydrogenated product thereof, a polymer of a cyclic body or a mono-aliphatic monomer of a dilute alicyclic hydrocarbon type Polymer or copolymerized oxime, hydrogenated product of the ethylene-rich hydrocarbon portion. The inclusion of the non-fresh bond of the square fragrant ring and the odd-form β, 忒4, the polymer of the original borneylene-based monomer, the polymer of the 6-ene aromatic hydrocarbon-based monomer, can be particularly good: :...In terms of mechanical strength and resistance to methacrylic resin, methacrylic resin is excellent in transparency, so it is suitable for use as an optical member 0 A|工0 Α ' ^ Earth acryl resin, which is stipulated by Japanese Industrial Code JISK6717 Methyl methacrylate having a methyl methacrylate content of 80% by weight or more. It is specified in the methacrylic resin of this specification, and the Weiss softening point temperature is 96 to 10 (10). C, the methacrylic resin having a specified classification code of 1 to 00 to 1 20 having a flow rate of 8 to 16 can be used satisfactorily because of its moderate fluidity and strength. The aromatic vinyl monomer constituting the copolymer of the aromatic vinyl monomer and the alkyl (meth)acrylate refers to an aromatic vinyl monomer and a derivative thereof, and examples thereof include styrene and α-fluorene. Styrene, m-decyl-styrene, p-nonylstyrene, o-chlorostyrene, p-chlorostyrene, and the like. The (meth)acrylic acid alkyl ester constituting the copolymer of the fluorene-terminated ethylene monomer and the (mercapto)acrylic acid alkyl ester, for example, a (meth)acrylic acid having a carbon number of 1 to 4; Alkyl esters and the like, among which methyl acrylate, C 2426 6-9221-PF 14 200832001 ethyl acrylate, decyl methacrylate, ethyl methacrylate can be preferably used. a copolymer of an aromatic acetamidine monomer and a (mercapto) acrylic acid base, 20 to 60% by weight of the aromatic vinyl monomer, and 40 to 80% by weight of the alkyl (meth) acrylate The co-polymer of % is preferred. Further, the above (meth)acrylic acid alkyl ester means the alkyl acrylate and the alkyl methacrylate. The polycarbonate used in the present embodiment is usually obtained by reacting a divalent phenol with a carbonate precursor by an interfacial polymerization method or a melt polymerization method. Representative examples of divalent phenols include 2,2-bis(4-hydroxyphenyl)propane (commonly known as bis-A) and 2,2-bis{(4-hydroxyoxy-3-methyl)phenyl. Propane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)-3-methylbutane f 2, 2-bis (4- Oxyphenyl)-3,3-dimethylbutane, 2,2-bis-hydroxyoxycarbyl)-4-methylpentane, U-bis(4-ethoxyphenyl) ring , 1'Bus(4-hydroxyoxyphenyl)-3,3,5-trimethylcyclohexane, 9,9-anthracene {(4-purinyloxy 3-methyl) And the United States ^ s ) 本 } 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 Mussels can be used as early carbonate precursors, and can be used in specific fields. For example, 々, 牛, 汛 汛 本 本 碳酸 或 或 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 The dentate formic acid of the phenol is obtained by reacting the above-mentioned divalent phenol with a carbonate precursor by a polymerization method to produce a polycarbonate resin, which is: a method or a catalyst, a terminal stopper, a divalent product, or a total of Aggregation of the second official Sa r / L (a) and so on. Polycarbonate 勹,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

2246-9221-PF 15 200832001 - It is also possible to mix two or more kinds of polycarbonates obtained by mixing. The term "styrene resin" used in the present invention refers to styrene, U-mercaptostyrene, o-f-styrene, p-nonylstyrene, p-chlorostyrene, p-phenylene oxide, Glycol styrene, (tetra) phenyl hydrazine, p-phenyl benzene, rubber polymer, acrylonitrile, etc., cyanoacrylate, rubber resin, ethylene, etc.而成 Η丨 ps resinized ethylene and aromatic ethylene copolymerized AS resin graft polymerization of vinylidene chloride and aromatic ethylene graft polymer and a mixture of gasified acetophenone and aromatic ethylene copolymer ABs resin; graft polymerization of rubbery polymer methyl methacrylate A and graft copolymer of aromatic vinyl Μ BS resin, etc., as long as according to water absorption, refractive index, heat, impact resistance, etc. The performance requirement can be selected. ▲ In the present embodiment, as the thermoplastic resin, a peripheral ', ', a plastic, a raw elastomer, an additive, or the like can be used as needed. The thermoplastic elastomer may, for example, be a 'polydecadiene' styrene τ dilute block copolymer and an adduct thereof, a styrene isoprene block copolymer, and a mouthpiece and a hydrogenated product thereof. Wait. The blending amount of the thermoplastic elastomer is generally 0.01 to 50% by weight, and 5% to 5% by weight. Additives, can be invited to ^ 丨 4, μ la xi b WJ for example, light diffusing agent, oxidation inhibitor, UV absorber, light stabilizer, pad hopper, 丨 ^ 疋Μ wood or pigments, etc. , slip agent, plasticizer, anti-static agent, Pu. The light diffusing agent may, for example, be a fine particle composed of a sample of a fine bismuth polymer, a sphagnum, or a bridging material, or a squid , calcium carbonate, dioxide dioxide, talc, and the like. Among these, from 婪 婪 婪 本 糸 糸 糸 糸 糸 、 、 、 、 、 、

2246-9221-PF 200832001 The fine particles composed of a polymer or such a bridging material have excellent dispersibility and excellent heat resistance, and do not yellow during molding, so that they can be used particularly preferably. There is no special restriction on the D-period of the spoon i, and it is usually 〇. 〇 〇 〇 〇 〇 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 The particle size of the light diffusing agent when the light diffusing agent is blended as a blending agent is not particularly limited, and the average particle diameter is usually 〇.5 to l〇0/zm, preferably in the range of 〇.5 to 80//m. . In the optical flat member according to the present embodiment, the arithmetic mean roughness of the range of the radius η of the washing trace and the point on the opposite side of the surface of the trace of the deposit are from the center of the trace of the money. The arithmetic mean roughness - in the range of the radius, the heart, and the range is set to satisfy the condition (condition 1) or (condition 2), and the total light transmittance of the optical flat member is set within the above-mentioned predetermined range. Therefore, even if the trace of the flooding is in the optically effective surface, the ancient scorpion is very small, and the traces of the washing are not obvious when the optical device is constructed. The sheet member for optics according to the present embodiment is produced by injection molding using a mold including a channel. Figure 7 is a diagram showing the construction of a cooker including a hot runner.杈', 2 &amp; a solid side mold 4 and a movable side mold 6. In the opposite side of the movable side mold 6 of the fixed side mold 4, a surface having a predetermined shape of an optical 8 plane (second surface) to which a molded article (hereinafter, referred to as an optical flat member as needed) is provided is provided. (shape-imparting surface) stencil 8. The shape-imparting surface of the stencil is processed to have a predetermined arithmetic mean rough slat. Further, the movable-side mold 6 has a cavity formed on the surface opposite to the side mold 4 The face 2246-9221-PF 17 200832001 of the optical effective surface of the optical plate member 16 includes a plurality of pairs of cavity 1 〇 supplied with molten resin 14 1 ► Dan has a valve plug 12a (refer to FIG. 8) The hot runner nozzle of the type is 12). The front end of the valve plug 12a is processed to have a predetermined average number of noses. The mold is used to make a molded product! The mold clamping is performed at a predetermined pressure using a clamping device not shown in the drawing. At this point, as shown in Fig. 8, the hot runner nozzle 12 is closed by the valve plug 12&amp; secondly, as shown in Fig. 9. Show that the hot runner nozzle 12 is tilted back and opened In the flow path nozzle 12, after the hot runner nozzle 12 injects "(4) grease 14 〇 into the cavity 10 to emit a predetermined amount of molten resin 14, as shown in FIG. 1A, the crucible 12a is advanced to the hot runner nozzle 12 shut down. At this time, the molded article 16 is transferred with the shape of the end portion of the valve plug 12a. Thereafter, the mold 2 is cooled and the molded article 16 is taken out by the mold 2. According to the manufacturing method of the optical flat member according to the present embodiment, the end portion of the word valve & 12a is processed into a predetermined arithmetic mean roughness. The shape of the stencil 8 is applied to a predetermined arithmetic mean coarse sugar 2&quot; The average of the arithmetic mean W of the radius of the &lt; mouth radius r2 (4) corresponds to the range of the arithmetic mean (four degrees) of the range of the face of the opposite side of the face having the surface of the wash mark == half of the point of the heart υ or (condition 2) into... In addition, in the above-mentioned resin of 16/1 right, the total light-tooth transmittance of the surface of the molded article satisfying the above conditions on the side of the money trace is set to 50 to 90% '6〇 It is better within the scope of the instrument. therefore,

2246-9221-PF 18 200832001 It is possible to manufacture an optical flat member in which the gate trace is not noticeable even when the gate mark is in the optical effective plane, and the brightness is hazy. Further, according to this manufacturing method, even if the trace of the wash is in the optically effective surface, since the luminance halo is small, the gate trace is not conspicuous when it is mounted on the optical device, so it can be optically effective corresponding to the flat member for optics. In the present embodiment, the large-sized flat plate member for optical use is produced by the injection molding, and the large-sized optical flat member Y having a small thickness can be efficiently produced by injection molding. When the mold 2 having the j flow path 13 is used and the hot runner 13 is used, the arithmetic mean roughness Rai of the wash mark can be set to a predetermined value, and the molten resin can be cold-cured in the washing. Further, the hot runner 13 is used. Since the flow of the waste tea is not generated every time, the resin can be used effectively, and the amount of the resin melted per shot is reduced, so that the molding cycle can be shortened and the productivity can be improved. Since the mold 2 has a plurality of mouths, the mold 2 has a mouth 12, so that the shape of the wide end can be transferred to the washing marks, and the washing marks can be omitted. The flow has a predetermined arithmetic mean roughness - the smear produces a shear 埶 = 尧 V2 'the flow of the molten resin 14 is squeezed, and", in the gate of the molten resin 14 t θ # will be the valve plug 12a ~ The viscosity of the mountain 14 is reduced, and the shape of the known shape is correctly transferred to form a mean average roughness of the arithmetic mean of the front end of the valve plug 12a. Rai's circumscribing traces ~ before the door bolt 12a, the end of the eve of the eve, the 钿 钿 钿 ,, the valve ^ average roughness Rai is processed to a predetermined value 224 β-9221-pp 19 200832001 law is not particularly limited, for example Reasoning, plating, etc. It can be used for machining and sandblasting. The carbon is in the position of the front end of the "form" valve plug. There is no special limit for the front end of the door bolt and the inner surface of the mold cavity. 1 The flat plate member with the concave and convex optics. In addition, the AJ valve privately smashes the mold module. The two-dimensional optical flat plate structure with the recessed in the wash mark can also introduce the front end of the valve plug to the inner surface of the mold cavity. Optics with convexities in the shape of the flood In the present embodiment, the shape of the tip end of the door latch is not particularly limited, and for example, ': a column shape, a bowl shape, a truncated cone shape, etc. The valve plug of the front end shape can be formed by using 5〜5_ Preferably, the diameter of the gate mark of the optical flat member is preferably from 5 to 5 mm, in the case of the optical plate member having a recessed or convex portion such as a cylindrical shape, a shape, or a truncated cone shape. In addition, the depth of the depression or the height of the convex part of the jikou trace is 1 0· 2 _ 仫. Compared with 〇· 〇1_hour, the forming of the front end of the valve plug is difficult. Further, in the side wall portion of the washing mark formed by the valve plug, the inclination angle (i.e., the inclination angle W) may be omitted, and the inclination angle may be set. Here, the inclination angle (gate angle) of the side wall portion of the gate mark is referred to as the normal line and the gate mark standing on the optical flat member (the bottom surface of the washing mark) as shown in FIG. The angle formed by the side wall portion. It is possible to set the inclined angle to the sun, for example, by providing an inclined surface at the front end of the valve plug. The demolding of the gate portion is facilitated by the inclination angle of the side wall portion of the gate mark. Further, the inclination angle of the side wall portion is preferably 8 〇 or less 2246-9221-PF 20 200832001, more preferably 60 degrees or less, further preferably 45 degrees or less, and particularly preferably 4 degrees or less. By making this angle, the gate traces are made more difficult to see, and the front end of the valve plug is easier to machine. Moreover, the traces of the mouth are preferably recessed at the point where the trace of the gate is less likely to be seen. # The injection molding conditions of the optical flat member according to the present embodiment are obtained, and the glass transition temperature of the thermoplastic resin to be used is Tg, and the temperature of the material is Tg + 8 (TC to Tg + 20 (range of TC) The temperature is in the range of Tg - 4 〇 it k Tg C, and the injection rate is preferably in the range of 1 Occ / sec to 800 cc / sec. The temperature of the hot runner when the mold has a hot runner is Tg + 8 (rc ~ Tg + 2 (10) In the optical flat member of the present embodiment, a light diffusing plate as a direct type, a light guide plate of a side light type, a light curtain of a direct type backlight, a dome lens for rear projection TV, or the like can be used. Fig. 12 is a view showing a configuration of a direct type backlight device including a light diffusing plate of a direct type. The direct type backlight device shown in Fig. 12 is attached to the reflecting plate 20 at a predetermined interval. The cold cathode tube 22 is disposed thereon, and the optical flat member (light diffusing plate) 16 of the present embodiment has a wash mark: the surface is placed on the light incident surface. Therefore, it is possible to provide an optical trace even if the wash mark is provided. Effective in-plane, brightness Halo surface light source. In addition, the mold can also step into the cold runner 'when further cold runners are used' (1) use in-mold washing and cutting technology, (2) use needle point washing or diving moderately Adjust the inter-mode conditions and so on. Do not do this

224 6-9221-PF 21 200832001 There is a disadvantage that the processing period of the need for the washing marks after forming is made longer in the case of the corresponding molding. [Examples] Hereinafter, the present invention will be described in more detail by way of examples. (Example 1) Mixing a resin having an alicyclic structure [Japan ZE 诵 叫 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 It is extruded into a strip of rubber and used as a colloidal machine. From the colloidal particles for the light-diffusing sheet, the injection molding = force is used. ·2%. The diffusion mold of the floor board of the building is thick, and the mold hole method is 'vertical 43〇 _, horizontal (10) _, =::, depth u_' as shown in Fig. 13 , the first incident surface of the light diffusing plate 8 etc. Divided into eight rectangular centers, each door-washing hot runner nozzle. Valve plug (washing plug), in the injection:; opening: the molten resin is sent to the cavity, after the end of the injection, the valve plug is closed to stop the supply of resin. At this time, the shape of the front end of the valve inspection will be transferred to the molded product. The diameter of the front end of the valve plug is 1·5_, and the cylindrical portion of the length 〇"_ protrudes toward the light incident surface of the light expansion plate, and the light is incident on the light diffusion plate. The surface is formed with a diameter of 1·5 min and a cylindrical depression of depth 〇·mmm to adjust the valve plug. The circular portion of the diameter of the front end of the valve plug is processed to an arithmetic mean roughness of 〇············· On the opposite side of the side of the gate, the template of 2246-9221-PF 22 200832001 稜鏡 pattern is installed, and the stencil is processed into the arithmetic mean roughness prism. The temperature of the tube was 275 〇, the hot runner temperature was 26 (rc, the mold temperature was 8 generations, and the light diffusion plate was produced by injection molding all the time. The gate trace angle of the light diffusion plate was 〇.

: at the center of the gate mark on the surface of the light incident side, and the radius of the π trace on the opposite side of the surface on which the gate trace exists is ^ Γ the radius of the point corresponding to the center of the drowning trace, 4 r2 = nx3G The range is measured by an ultra-deep microscope to calculate the arithmetic mean roughness. The average roughness Rai of the gate traces of the average of the measured values at each of the eight points is 〇·22# m, and the surface on the opposite side of the surface on which the 70 marks are present is defined by the radius η of the point of the center of the corresponding trace. The arithmetic mean roughness is 〇.14#m. The -man's total light penetration rate was 80% as measured by the sidelight of the light diffusing plate in the presence of a gate mark. The inner side of the method is 72 〇 wide, 42 长 long, and the depth of 17 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The light leaked out, and the outer surface of the 3. Omm cold cathode fluorescent lamp was mounted at a distance of 4 〇 _ parallel to the center of the tube from the bottom surface of the box. The light diffusing plate is separated from the surface of the tube of the cold cathode fluorescent lamp by 12 mm, so that the surface of the light diffusing plate having the gate mark becomes a light incident surface, and the gate trace of the light diffusing plate is formed into two cold cathode fluorescent lamps. The intermediate position is placed, and the cold cathode fluorescent lamp is turned on to measure the brightness haze of the gate trace of the light diffusing plate. The brightness is based on the light exit surface of the light diffusing plate, and the laminated diffusing sheet 2246-9221-PF 23 200832001 [(s) TSUJIDEN' D124J], as shown in Fig. 14, the diameter of one side is rounded. 8/3 times the square, so that the center of the square is consistent with the center of the circle of the gate mark. Consider the _ edge at 9 points, and the pitch is the square of the diameter of the gate mark / 81 of the 81 points. The number of the grid points was 81, and it was measured using a luminance meter. The difference between the maximum value and the minimum value of the 81 brightness measurement values was divided by the average value to calculate the brightness halo. The average value of the brightness halos of the eight wash marks was 〇·3%, and the flood marks could not be visually confirmed.

(Example 2) As shown in Table 1, a light-diffusing sheet was formed using an alicyclic structure resin having the same specifications as the examples. The light diffusion plate has a gate trace angle of 2. . Further, the diffusing agent concentration of the light diffusing plate was 〇·3%. At this time, the same mold as in the first embodiment is used, except that the front end portion of the valve plug is processed into an arithmetic mean roughness of 〇·05//m, and the stencil forming the 稜鏡 pattern is processed into an arithmetic mean roughness, which constitutes a 稜鏡 稜鏡The arithmetic mean roughness of the surface is measured in the same manner as in the example i, and the average number of the rough traces of the washing marks is Rai; the side opposite to the side where the washing marks are present is surrounded by the radius m of the center of the corresponding washing marks. The average degree of completeness of the arithmetic full t-line penetration rate '" is °. 〇 8", "for 1.2 one, the total light transmittance is 70%. The brightness halo, 8 poured to visually confirm the gate mark and implementation Example 1 is the same as the average value of the brightness halo of the trace of the gate trace is 〇·3%, can not trace 0

(Example 3) 224 6-9221-PF 24 200832001 As shown in Table 1, a light-diffusing sheet was formed using the same alicyclic structure resin as in Example 1. The light diffusion plate has a gate trace angle of 3 〇. . Further, the diffusing agent concentration of the light diffusing plate was 〇·7%. At this time, the same mold as in the first embodiment is used, except that the front end portion of the valve plug is processed into an arithmetic mean roughness of 1 · 5 // m, and the stencil forming the 稜鏡 pattern is processed into an arithmetic mean roughness constituting 稜鏡The arithmetic mean roughness of the surface is 8· 8 # m. The arithmetic mean roughness Rai of the gate trace was calculated in the same manner as in the first embodiment, and the arithmetic mean roughness of the surface on the opposite side to the surface on which the gate trace was present was defined by the point of the center of the corresponding gate trace at the radius η. Ra2; total light transmittance, Rai is 1·45//m, Ra2 is 1.71 // m, and the total light transmittance is 70%. The luminance halo of the gate trace was measured in the same manner as in the case of the first embodiment, and the average value of the haze of the eight gate traces was 0.2%, and the gate trace could not be visually confirmed. (Example 4) In the following Table 1, a light-diffusing sheet having a Moon-shaped ring structure having the same structure as that of Example i was used. The edge of the light diffusing plate has an angle of two. . Further, the diffusing agent has a diffusivity of 0 5%. At this time, use the same mold as the implementation =:, but the front end of the valve plug is processed into an arithmetic mean roughness: the stencil forming the cylindrical mirror shape is processed into an arithmetic mean (four degrees), that is, the arithmetic mean of the face of the shape of the mirror The roughness is measured in the same manner as in the first example, and the arithmetic mean roughness of the gate traces is the same as that in the case where there is a sound σ wide and the tens of thousands of the thick traces; Corresponding to the gate mark... + the range of the control η, the average roughness Ra "all 2246-9221-pf 25 200832001 # m, the total light penetration light penetration rate, Rai is O.lS^in, the ruler is the j rate 72%. The mouthwash was measured in the same manner as in Example 1 to measure the brightness of the mouthwash. The average value of the brightness of the eight traces was 〇5%, and the helmet was two U. (Example 5) As shown in Table 1, a light-diffusing sheet was formed using an alicyclic structure resin having the same principle as in Example i. The "diffraction angle of the light-diffusing sheet was ◦. . Further, the diffusing agent concentration of the light diffusing plate was 〇·1%. At this time, the same mold as in the first embodiment is used, but the front end portion of the valve plug is processed into an arithmetic average roughness of 1.2/zm, and the shape of the quadrangular pyramid (four) is processed into an arithmetic mean rough degree, that is, a quadrangular pyramid shape is formed. The arithmetic mean roughness of the face is 〇·3//πι. In the same manner as the Bellows Example 1, the arithmetic mean roughness Ra of the gate trace is equal to the arithmetic mean of the range of the radius η from the center of the corresponding wash mark to the side opposite to the face having the wash mark. Roughness; total light transmittance, Rai is 1·3 // m, Ra2 is 〇·35 // m, and the total light transmittance is 78%. The luminance halo of the gate trace was measured in the same manner as in Example 1, and the average value of the luminance halos of the eight gate traces was 〇. 1%, and the gate trace could not be visually confirmed. (Example 6) As shown in Table 1, a light-diffusing sheet was formed using an alicyclic structure resin having the same principle as in Example 1. The gate trace angle of the light diffusing plate is 〇. . Further, the diffusing agent concentration of the light diffusing plate was 1%. At this time, a mold similar to that of the embodiment 2246-9221-PF 26 200832001 1 was used, except that the front end portion of the valve plug was processed into an arithmetic mean roughness, and the stencil was processed into an arithmetic mean coarse sugar of 0 5 /zm. In the same manner as in the first embodiment, the arithmetic mean roughness Ral of the koji trace, the arithmetic mean roughness of the surface on the opposite side to the surface on which the mouth mark is present, from the center of the corresponding wash mark to the radius Γ2 "Full light transmittance, ^ is 〇.15", Ra2 is 〇45/im, and the total light transmittance is 63%.亮度 亮度 卩 卩 卩 卩 卩 卩 卩 卩 卩 卩 卩 卩 卩 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度 亮度(Example 7) A light-diffusing sheet was formed using methacrylic resin (Asahi Kasei Chemical Co., Ltd., DELPET 70NHX) as indicated by π 1 . The light diffusion plate has a gate trace angle of zero. . Further, the diffusing agent concentration of the light diffusing plate was 2.5%. At this time, the same mold as in the first embodiment is used, but the front end portion of the valve plug is processed into an arithmetic mean roughness of 〇·3//m, and the stencil forming the 稜鏡 pattern is processed into an arithmetic mean roughness, which constitutes a 稜鏡 稜鏡The arithmetic of the face has an average thick chain degree of 0 · 8 // in. In the same manner as in the first embodiment, the arithmetic mean roughness Ra of the gate trace; the average of the surface opposite to the surface on which the gate trace exists is calculated by the point of the center of the corresponding gate trace at the radius η Roughness; = Light penetration rate 'Ra! is 〇· 8 # m, Ra2 is 0·65 // m, and the total light transmittance is 55%. The luminance halo of the gate trace was measured in the same manner as in Example 1. The average value of the luminance halo of the mouth mark of 8 2246-9221-PF 2Ί 200832001 was 〇·3%, and the gate trace 0 could not be visually confirmed (Example 8). As shown in Table 1, a light diffusion plate was molded using MS resin (Electrical Chemical Industry Co., Ltd., TX-1 0 0S). The light diffusing plate has a wash mark angle of 30°. Further, the diffusing agent concentration of the light diffusing plate was 1.5%. At this time, the same mold as in Example 1 was used, except that the front end portion of the valve plug was machined to an arithmetic mean roughness of 0.1//m, and the stencil forming the 稜鏡 pattern was processed into an arithmetic mean roughness, which constitutes the surface of the cymbal. The arithmetic mean roughness is measured in the same manner as in the first embodiment, and the arithmetic mean roughness Rai of the gate trace; the surface on the opposite side to the surface on which the gate trace exists is defined by the point of the center of the corresponding gate trace at the radius η The average roughness of the arithmetic; the total light transmittance, Rai is 〇· 09 V , Ra2 is 〇· 9 # m, and the total light transmittance is 61%. The luminance halo of the gate trace was measured in the same manner as in Example 1. The average value of the luminance halos of the eight gate traces was 0.2%, and the gate traces could not be visually confirmed (Example 9) as shown in Table 1. A light diffusing plate was molded using a polystyrene resin (G9504, manufactured by pp. Co., Ltd.). The light diffusion plate has a gate trace angle of 5 . Further, the diffusing agent concentration of the light diffusing plate was 〇·4%. At this time, the same mold as in the first embodiment is used, but the front end portion of the valve plug is processed into an arithmetic mean roughness of 0 · 2 // m, and the stencil forming the cylindrical mirror shape is processed into an arithmetic mean roughness, that is, the constituent column Arithmetic mean roughness of the face shape of the mirror

2246-9221-PF 28 200832001 〇· 1 // m 〇 is measured in the same manner as in the first embodiment, the average rough rotation degree Rai of the flood mark; the opposite side of the surface on the side where the gate mark exists is the corresponding gate The center of the trace is the arithmetic mean roughness r center of the radius; the total light transmittance, Rai is 0.21/zm, 2 is 〇〇8#m, and the total light* transmittance is 65%. 'Tooth The brightness halo of the mouthwash was measured in the same manner as in Example 1. The average value of the brightness halos of the eight mouth marks was 〇·2%, and the gate was not visually confirmed. (Comparative Example 1) As shown in Table 1, a resin-molded light-diffusing sheet having an alicyclic structure as in Example 使用 was used. The light diffusion plate has a gate trace angle of 5. . Further, the diffusing agent concentration of the light diffusing plate was 1%. At this time, the same mold as in Example 1 was used, except that the front end portion of the valve plug was machined to an arithmetic mean roughness of 5 V m ' to process the stencil into an arithmetic mean roughness of 2 # ^. In the same manner as in the first embodiment, the average number of the rough traces of the wash marks is Ra!; the average of the face on the opposite side to the face on which the gate marks are present is the range of the radius Γζ from the center of the corresponding gate mark Roughness total light tooth penetration, Rai is 4.90/zm, Ra2 is 2.1〇#m, and the total light transmittance is 63%. The luminance halo of the mouthwash was measured in the same manner as in Example 1. The average value of the brightness halos of the eight gate marks was 3.1%, and the gate trace was visually blurred. (Comparative Example 2) 2246-9221-PF 29 200832001 ... as shown! As shown, the use of the same as the implementation of your "quote" has an alicyclic structure. The angle of the wash mark of the light diffusing plate is 〇. 2%。 The diffuser concentration of the light diffusing plate is 〇. 2%. Again... tlTj- &gt; You use the same mold of the legend 1, but the front end of the valve plug is also the mussels ^ 0 烕 the average number of rough rough will form the 稜鏡 pattern of the template to add the arithmetic average roughness, p constitute _ mirror The arithmetic mean roughness of the surface is 4 2 "The melon is measured in the same manner as in the example 1, and the washing trace 1 is calculated as the average crude sugar degree i?ai, which is the same as the surface where the gate mark exists. The point of the center of the trace is at the radius n The range of the previous = the corresponding roughness of the corresponding number of wash marks Ra "full first line penetration rate, 匕 is 2.2_, ^ is 4 1 〇 / / m person, the rate is 75%. 4.10", the total light penetration is measured in the same manner as in the first embodiment, and the average brightness of the eight sound tracks is 3 3%, so that the washing can be clearly seen by visual observation (Comparative Example) 3) As shown in Table ,, (4) a tree-forming light diffusing plate having an alicyclic structure as in the example μ. The angle of the mouth of the light diffusing plate is 3 〇. Further, the diffusing agent of the light diffusing plate The concentration is 0·3%. At this time, the same mold is used for the disc, but the front end of the door bolt is processed into an arithmetic mean thick chain f 2.8", and the template forming the 稜鏡 pattern is processed into an arithmetic mean rough, that is, the composition The arithmetic mean roughness of the face of 稜鏡. 6 #(五). With the example! Simultaneously measured, the arithmetic mean of the washing marks is rough: Ra1; the opposite side of the surface on the opposite side to the surface where the washing marks are present, the average roughness I of the range from the center of the corresponding washing mouth mark, the point of the center to the radius r2 2246-9221-PF 30 200832001 Light transmittance, Ra^ 2.6Mm, Ra2 is 〇55 rate 71%. .55 (4) 'Total light transmission The brightness halo of the washing marks was measured in the same manner as in Example 1. The average value of the brightness halos of the δ washing marks was 2.1%, so that the mouth marks were clearly visible. (Comparative Example 4) As shown in Table 1, a resin-formed light-diffusing sheet having an alicyclic structure as in Example i was used. The wash mark m 15 of the light diffusing plate. . Furthermore, the diffusion (four) degree of the light diffusing plate is ^. At this time, the same mold of the food example 1 is used, but the front end portion of the valve plug is processed into an arithmetic mean rough degree, and the stencil is processed into an arithmetic mean roughness 〇〇1. "Exit. Measured in the same manner as in Example 1, the arithmetic mean of the wash marks is (four) degrees Rai; the face on the opposite side of the face on which the koji trace is present is calculated by the point of the center of the corresponding mouth mark in the range of radius Γ2 Average roughness ^ ;: Light transmittance, ―0.02//m, ―〇〇2&quot;, full* transmittance is 92%. 'Tooth is measured in the same manner as in Example 1 for the brightness of the gate mark. The average value of the brightness halo of the 8 gate marks is h2%, which can be clearly seen by visual inspection. 2246-9221-PF 31 200832001

2246-9221-PF 32 200832001 The above-described embodiments and examples described above are intended to be illustrative of the present invention and are not intended to limit the invention. Therefore, all of the design changes or equivalents of the above-described embodiments and examples are included in the technical scope of the present invention. The first patent is based on the Japanese patent application number _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing the shape of a triangular plate for an optical plate according to an embodiment. Fig. 2 is a cross-sectional view showing the shape of a square gusset formed in the optical flat member according to the embodiment. Fig. 3 is a cross-sectional view showing the shape of a composite crucible formed in the optical flat member according to the embodiment. Fig. 4 is a cross-sectional view showing the shape of a cylindrical mirror-shaped crucible formed in the optical flat member according to the embodiment. Fig. 5 is a cross-sectional view showing the shape of a hemispherical projection formed in the optical flat member according to the embodiment. Fig. 6 is a perspective view showing the shape of a quadrangular pyramid formed in the optical flat member according to the embodiment. Fig. 7 is a cross-sectional view showing the structure of a mold having a hot runner according to an embodiment. Fig. 8 is a cross-sectional view showing a manufacturing method of an optical flat plate structure 2246-9221-PF 33 200832001 using a mold according to an embodiment. Fig. 9 is a cross-sectional view showing a manufacturing method using a module according to an embodiment. The first embodiment is a cross-sectional view showing a method of manufacturing an optical flat member using a mold according to an embodiment. Ten Plates Fig. 11 is a view for explaining the angle of the gate traces of the embodiment. Fig. 12 is a perspective view showing the structure of a direct type backlight device according to an embodiment.

Figure 13 is a view showing the gate position of the mold used in the embodiment. Fig. 14 is a view showing the measurement position of the brightness of the gate in the embodiment. [Main component symbol description] 2~mold; 4~ fixed side mold; 6~ movable side mold; 8~ stencil; 10~ mold hole; 12a~ valve plug; 12~ hot runner nozzle (gate); 13~ hot runner ; 14 ~ molten resin; 16 ~ caused shape; 2 0 ~ reflector; 2 2 ~ cold cathode tube. 2246-9221-PF 34

Claims (1)

200832001 X. Patent application Fan Park································································································ - the first surface corresponding to the washing mouth a · the washing surface of the foreign body is formed, and / the second surface of the opposing side is the opposing side, and the first surface is present on the first surface The radius of the above-mentioned conditional traces in the effective surface of the 乂 子 为 为 is the arithmetic of the range of the average roughness of the range R χ χ χ χ χ , , , χ χ , , , , , , , , χ χ χ χ χ χ χ χ χ χ χ χ χ χ χ χ In the second surface, the radius r2 centered on the point corresponding to the center of the upper trace (r2 = average roughness is Ha, when: (condition 1) and Rai $ Ra2 m) & Rai$ 3 (/ /m), and Ra2$3 (/zm) or (Condition 2) Rai$ 1 ( // m), and Ra2^ 3 ( # m). 2. The optical flat member according to claim 1 , wherein the total light transmittance of the surface on the side where the gate mark is present is 50 to 90% 〇 3 · as claimed in claim 1 or 2 The optical flat plate member for use in a light diffusing plate. The method for producing an optical flat plate member according to any one of claims 1 to 3, wherein Injection molding using a mold including a hot runner of a valve gate. 2246-9221-PF 35