TW200900224A - Optical sheet manufacture method and optical sheet - Google Patents

Abstract

A manufacture method of an optical sheet made of a transparent thermoplastic resin sheet on whose surface a regular geometric design working is performed, the optical sheet manufacture method comprising steps of performing a geometric design working on the resin sheet at a temperature not lower than a glass transition temperature of the resin sheet, by using a metal endless working belt formed with a geometric design on a surface thereof, rapidly cooling the resin sheet on which the geometric design working is performed to a temperature lower than the glass transition temperature, and detaching the rapidly cooled resin sheet from the metal endless working belt.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of producing an optical sheet made of an amorphous transparent crystalline resin sheet whose surface is subjected to embossing. [Prior Art] A so-called m' which is a resin sheet or film having a regular space geometry design (embossing pattern) formed on the surface has been produced. Generally, a refining extrusion method in which a thermoplastic resin refining body is extruded in a sheet shape into a tau mold is widely used.

(T -), so that the metal roll (having a concave/convex shape on its circumferential surface) is sandwiched and compressed between the rubber roll and compressed (four) body cooled and solidified to continuously form a concave/convex on the surface A sheet having a shape and a flat back surface (10), for example, Japanese Patent Laid-Open Publication No. HEI_9_295346, Patent Document 1). In the solution extrusion method, transfer and detachment are simultaneously performed by using the same resin having a geometric shape and a solid T-die extruded. In order to achieve perfect transfer, the resin must have sufficient heat energy, and in order to perform the detachment, the cold portion of the tree must be made no higher than the glass transition temperature (Tg) of the resin. Since the solution extrusion method is difficult to perform sufficient heating and cooling by transfer and cooling using the same-real reading, it is difficult to perform transfer and detachment perfectly, and the embossed sheet manufacturing method will be formed in The embossing pattern on the surface of the metal roll or metal plate is transferred to the surface of the resin sheet. According to another known method, a embossed pattern is formed on the surface of the resin sheet by using a metal endless processing belt wound on a plurality of pros and having a embossed pattern formed on the surface of the endless belt. (For example, see Japanese Patent Laid-Open Publication No. 2001-277354, Patent Document 2).

The embossed sheet produced in the manner described above can be used, for example, as an optical sheet for a liquid crystal display device. Specifically, a prism sheet in which a prism shape having a triangular cross-sectional shape is continuously disposed can be used as the embossed sheet. Prismatic sheets are widely referred to as brightness improving sheets (films) for improving front brightness by concentrating backlights. For example, the publication of WO 2 〇〇 6/〇71621 (Patent Document 3) discloses a prism sheet having an in-plane anisotropy of a refractive index and formed by stretching a resin sheet having a prism shape on the surface. SUMMARY OF THE INVENTION It may be desirable to form an amorphous resin sheet having a embossed pattern on a surface. In order to subject the embossed sheet to a shape treatment to have an in-plane anisotropy of refractive index, the crystalline resin sheet is usually stretched in a uniaxial direction or a biaxial direction. In this case, the crystalline resin sheet is preferably in an amorphous state so that the stretching process can be suitably performed with higher precision. The prior art embossing sheet manufacturing method described above is extremely difficult to perform the (4) treatment while maintaining the =lip sheet in an amorphous state. That is, after the method of manufacturing the pre-monthly technical embossed sheet, after the resin sheet is formed with a dried flower pattern by raising the temperature to a temperature higher than the glass transition temperature or close to the crystallization temperature range, it is impossible to prevent the resin from lowering the temperature of the resin sheet. Crystallization during the cold section process from temperature. As the crystallization of the resin sheet proceeds, the resin becomes white and the degree of 四 (four) is lost. 4 Therefore, the resin sheet becomes unsuitable for use as an optical sheet. If the degree of transfer/JB" is low or the temperature is high, it is impossible to obtain the transfer precision of the θ embossing pattern. 126535.doc 200900224 a The present invention has been made in view of such problems. According to the embodiment of the present invention, there is provided an optical sheet manufacturing method which is capable of preventing whitening due to crystallization of a resin sheet and obtaining a high-precision embossed pattern. According to an embodiment of the present invention, an optical sheet manufacturing method is a method of manufacturing an optical sheet made of a transparent thermoplastic resin sheet whose surface is subjected to a regular geometric design treatment. The optical sheet manufacturing method comprises the steps of: forming a geometric design on a resin sheet at a temperature not lower than a glass transition temperature of the f resin sheet by using a metal annular processing belt having a geometric design formed on the surface; The geometrically designed resin sheet is rapidly cooled to a temperature below the glass transition temperature; and the rapidly cooled resin sheet is detached from the metal endless processing belt. In the embodiment of the invention, the resin sheet is subjected to a geometric design (embossing shape) treatment at a temperature higher than the glass transition temperature of the resin sheet, and thereafter the resin sheet is rapidly cooled to a temperature lower than the glass transition temperature or crystallization. The temperature range is used to suppress the crystallization of the tree. Also in an embodiment of the present invention, the embossing process is performed on the resin sheet by using the metal annular processing belt, and then the metal transfer ring and the cooling process are combined with the metal ring-shaped belt. The resin sheet is detached from the metal endless processing belt at a temperature lower than the glass transition temperature of the resin sheet. Therefore, the embossing shape of the resin sheet is improved in transfer efficiency and release efficiency. In order to prevent the crusting of the amorphous resin sheet, the focus is on the cooling rate at which the temperature of the transfer film is not higher than the glass transition temperature of the resin sheet, although it is used for the resin > Depending on the material, but set the cooling rate to, for example, not slower than generation/sec and not faster than 4 (rc /sec. If the cooling rate I26535.doc 200900224 is slower than rc/sec, it is impossible to prevent excessive waxing Crystallization, resulting in whitening (loss of transparency). If the cooling rate is set to be faster than 4 〇t/sec, the embossing process is degraded and it becomes difficult to obtain shape transfer. When the resin sheet is detached from the metal endless processing belt The crystallinity of the resin sheet is set to not more than 20% and preferably not more than 5%. If the resin sheet: two exceeds 鸠, the transparency is significantly reduced due to whitening, and the resin sheet becomes = used for Optical sheet.

The geometrical design (embossed shape) formed on the surface of the resin sheet is not particularly limited, but may have a shape having at least - an angular (sharp edge) such as a prism shape, a rectangular wave shape, and a trapezoidal shape. Even if it has at least one angular shape, the L-shaped shape can be transferred at a high transfer rate. Although the apex angle of the prism shape is set to, for example, 9G. , but it can be less than %. The acute angle is greater than 9 inches. Obtuse angle. The embossed shape can be a lens shape. As long as the material of the resin sheet is a transparent thermoplastic resin, it is not particularly limited. It is preferred to use PET, qing, a mixture or copolymer of such materials. 1. The cooling rate is stably maintained, and the total thickness of the resin sheet can be set to two) 500 Å or less. The ratio of the height of the embossed shape to the total thickness of the resin sheet (4), for example, 9 G% or less, 1 height ratio exceeding 9 G%, is in the crack of the tree or the like, thereby lowering the treatment efficiency. The resin sheet may be an elongated strip or a sheet cut into a predetermined size. The metal ring processing belt is very thick. The bucket can be stainless steel, nickel steel and the like. In the embodiment of the work belt, it is preferable to adhere the resin sheet to the metal ring-shaped heating, "and the cooling process:: πτ grease" at the same time as the mother of the same. As the resin sheet is adhered to 126535.doc 200900224 to the metal ring processing belt The method, for example, has a method of firmly adhering a resin sheet to a belt by heating the metal endless belt sheet to a softening temperature of the resin sheet (not lower than the temperature of the glass transition temperature). The manufacturing cost can be reduced. Since the rolling sheet can be continuously manufactured, the manufacturing efficiency can be improved. During the heating process, for example, the heating system starts from the inner side of the metal annular processing belt. Heating is started from the inner side of the belt. Directly adding a piece of heated annular processing belt to & n, n ▼ to improve the heating efficiency. As a means of heating from the inside of the metal ring processing, it is most effective to use the wrapped roller as a heating view. In addition, there is a method of performing heating by means of an electric heater provided in the parent or a method of circulating the heated oil in the roller: according to cooling means, cold The water flows inside the metal roll. It is also possible to assist the heating by means of an external heater or to assist the cooling by means of an air flow. In the embodiment t, the metal annular processing belt is wound around a glass set to be lower than the resin sheet: Production: The heating roller and the rotation speed of the heating roller and the cooling roller are set to the necessary cooling speed, according to the prevention of crystallization of the resin sheet and the operation (4) π · cooling temperature, the pitch is Speed) (metal ring processing belt) The conveying speed). The umbrella of the metal core processing belt; M. The in-plane temperature uniformity largely affects the surface to be transferred onto the surface of the resin sheet - the processing precision of the shape of the upper layer is obtained. In an embodiment of the invention, the opposite end portion of the heating roller is set, and the cooling light is set to be higher than the opposite end portion of the phase. The widened roll temperature is set lower than possible to improve the metal annular processing belt. Plane 126535.doc -10· 200900224 Internal temperature uniformity and manufacture of embossed sheets with excellent form accuracy. Supply tree between rolls placed with facing heating rolls and metal endless processing belts The grease sheet is used to perform embossing treatment on the resin sheet. Under such conditions, the nip point pressure between the right metal annular processing belt and the roll is lower, and the embossing shape transfer precision is lowered', and if the nip point pressure is high, Then, the durability of the roll is adversely affected and stable production becomes difficult. The preferred rolling point pressure is a line pressure of not less than 5 kg/cm and not more than 3 〇kg/cm. To increase the cooling rate of the resin sheet. Increasing the feeding speed of the metal endless processing belt', the movement performance of the resin sheet becomes unstable or sufficient preheating is not obtained, and the feeding efficiency is further lowered. The endless belt is wound around the roll and the opposite roller facing the cooling roll, and The resin sheet is fed by being sandwiched between the endless belt and the metal % shaped processing belt. Therefore, it is possible to improve the movement stability and the feeding speed of the resin sheet. As described above, according to the optical sheet manufacturing method of the present invention, it is possible to form a desired embossed shape on the surface of the crystalline resin sheet while the transfer rate is prevented, and to prevent the resin sheet from being whitened by crystallization. [Embodiment] Each embodiment of the present invention will be described with reference to the accompanying drawings. [First Embodiment] Outline structure of a sheet manufacturing apparatus 制造 of a manufacturing method Fig. 1 is a view for explaining an optical sheet pattern according to a first embodiment of the present invention.

1 and 12, the opposite side of the sheet manufacturing apparatus and the cooling rolls 12, 11 are placed and rolled 126535.doc 200900224 (back roller) 16. The sheet manufacturing apparatus i feeds the transparent amorphous crystalline resin sheet 1同步 in synchronization with the zigzag belt i3 between the nipple belt 13 and the dry roll 15, and the resin sheet is pressed against the nipple belt 3 by the heating roller U. The resin sheet is heated to not lower than the glass transition temperature and thereby the embossed shape of the embossed belt 13 is transferred onto the surface of the resin sheet 10. The resin sheet is moved rapidly by the cooling roll 12 in a state where the resin sheet is adhered to the embossed belt 13, and is detached from the dried flower ribbon 13 to produce an embossed shape having a pre- (four) shape on the surface (prism pattern) A transparent amorphous crystalline resin sheet 10 of 10a. The heating roller 11 has a built-in heating member such as a heater, and its surface temperature is set to a temperature higher than the softening temperature of the resin sheet 1G, that is, a temperature higher than the glass transition temperature of the resin sheet 10. Therefore, the portion of the embossed belt 13 positioned above the heating roller 11 is also heated to this temperature, so that the heating process can be performed on the resin sheet 10 at this position. In the present embodiment, 'the surface temperature of the heating roller n is set to be not lower than T^g+6 (rC and not higher than the temperature range of (four), and the suppression is) the glass transition temperature of the tree slab 10 . If the set temperature is lower than Tg + 6 〇 c > c, no: high transfer precision of the embossed pattern to the resin sheet 10 is obtained. If the set temperature is less than Tg + 90 c and the resin sheet 10 is made of a crystalline resin which is difficult to maintain in an amorphous state, the crystal of the resin sheet 1 is excessively accelerated, and the transparency caused by whitening is degraded. Become remarkable. The cooling roll 12 has a built-in cooling member such as a water cooling system, and its surface temperature is set to a temperature lower than the glass transition temperature of the resin sheet 1G. In the present embodiment, the surface temperature of the cold portion 12 is set to be. Because of 126535.doc 200900224, the position of the embossed belt 13 is on the cooling view. You can also cool the part of the upper part of the 12th 12, and the TM is placed on the resin sheet 1 〇 to perform a cooling process. In the present embodiment, as shown in FIG. 8A, the temperature of the roller at the center of the heating roller 1 is set higher than that of the opposite end. One (four) and the other, as shown in FIG. 8A, the cooling roller is used. The roll temperature of j 2 φ π # $ λ ^ is set lower than that of the opposite end boring tool. Therefore, it is possible to improve the in-plane temperature uniformity of rolling π and to manufacture embossed sheets having excellent shape accuracy. The heating source used to achieve this temperature is: if the heating source is used, the electric heater is constructed by the electric heater at the center of the roller (4) larger than the opposite roller end portion. At least one of the heated crucible > 11 and the chill roll 12 is adapted to be rotatable by being coupled to a rotary drive member such as a motor. The embossed belt 1 is a "metal endless processing belt" of the present invention which is made of a metal endless belt having excellent heat (4). In the present embodiment, the embossed belt 13 is made of recorded steel and is on the surface thereof. A knurled shape (geometric design) (1) having a groove (prism shape) in which a triangular sectional shape is continuously arranged. The apex angle of the prism is not particularly limited' and it may preferably be, for example, 120 or less. And 90. The embossed belt 13 is preferably seamless (no joint). The embossed belt is preferably grown by electroforming the tubular resin master having a embossed shape on the inner surface side to grow nickel steel or through The method is formed by winding on a roll and directly performing precision cutting processing. However, the present invention is not limited to such a method. In the present embodiment, the extending direction (ridge direction) of the embossed shape 13a is set to the width direction of the resin sheet iO. (lateral direction (TD)), but the direction is not limited thereto, and may be the direction of movement of the resin sheet 1 (machine direction (md)). For the improvement of the detachability of the resin sheet 1 for 126535.doc -13· 200900224 Applying a release agent to the embossed belt 13 The surface is formed on the surface of the embossed shape (1). The release agent is preferably a fluorine-containing resin, a ruthenium-containing resin or the like. The embossed shape 13a is not limited to a triangular cross-sectional shape (prism shape). The apex angle of the prism shape is not It is limited to 9 如图 as shown in the figure. The apex angle may be an acute angle of less than 9 〇 as shown in Fig. 9B, or an obtuse angle of more than 9 如图 as shown in Fig. 9C. The embossed shape 13a may be A rectangular wave (pulse wave) shape as shown in Fig. 9 or a trapezoidal shape as shown in Fig. 9E. The shape can be formed even at a high transfer rate to have at least one angular shape as described above (sharp The embossed shape of the edge. The embossed shape may be various lens shapes. The lens shape may be a cylindrical shape or an array shape. The lens surface may be a curved shape such as a spherical surface or an aspherical surface, or is not limited to a continuous curved shape. A composite shape composed of a plurality of curved shapes. A roll 15 is provided to sandwich and compress the resin sheet with the roll engaged with the embossed belt 13 and transfer the embossed shape 13a on the surface of the embossed belt 13 to the surface of the resin sheet. In this embodiment For example, similar to the heating roller u, the roller 15 has a built-in heating source and has a function as an auxiliary roller for heating the resin sheet 10 on the embossed belt 13 from the back. Although the circumferential surface of the roller 15 is a flat smooth surface, it is predetermined The embossed shape may be formed on the circumferential surface of the roll crucible 5 so that the shape can be transferred to the back surface of the resin sheet 10. The roll 15 may be a cooling roll having a cooling mechanism to assist the detachment of the back surface and prevent the back side roll (the shape of the reverse roll) The transfer pressure of the embossing point pressure applied to the resin sheet 1 by the roll 15 and the embossed belt 13 is greatly improved. In the present embodiment, the transfer precision of the shape 13a to the resin sheet 响 is obtained. The nip pressure was set to a higher line pressure of 5 kg/cmt and a pressure of 3 〇kg/cm or less. If the nip point pressure is less than 5 kg/cm, the transfer precision of the embossed shape 13a to the resin sheet 1 降低 is lowered, and if the nip point pressure exceeds 30 kg/cm, the durability of the roll 15 and the embossed belt 13 is affected. Adverse effects and stable production become difficult.

The women's opposite roller 16 serves as an additional roller which can be used when the resin sheet is detached from the embossing ▼ 13 on the cooling roller 12. Like the cooling roller 12, the opposing roller 16 has a built-in cooling member to maintain a surface temperature similar to the temperature of the cooling roller 12 and has a function of cooling the resin sheet 1 from the back surface. The nip pressure of the opposing roller "the circumferential surface has a flat smooth surface ^ applied by the opposing relative 6 and the embossed tape 13 to the resin" no is not particularly limited, but the circumferential surface of the opposing roller 16 is in close contact The point pressure of the back surface of the resin sheet 1G is sufficient. The material of the resin sheet 10 is not particularly limited as long as it is a transparent thermoplastic crystalline resin. In the present embodiment, polyethylene terephthalate ( PET), polyethylene naphthalate s§ (pEN), a mixture or copolymer of such materials' which is a crystalline resin which is subjected to abnormally strict manufacturing conditions during a cooling process for maintaining an amorphous state. A method of forming an amorphous resin sheet 1 in an elongated strip shape and continuously feeding it to the sheet manufacturing apparatus 1. Alternatively, 'the resin sheet ι which is cut into a predetermined size may be continuously fed one by one to the sheet manufacturing apparatus. Here, the amorphous resin sheet 10 means a crystallization ratio of, for example, 3% or less. The sheet manufacturing apparatus of the present embodiment is performed by using the umrim tape 13 = crystalline resin sheet 10 Dry flowers on the surface and rapidly cool the resin a process for producing an amorphous tree 126535.doc 15 200900224 fat sheet (embossed sheet or prism sheet) having a crystallization ratio of ground or smaller, or preferably smaller or smaller. If the crystallization ratio exceeds 2%, The deterioration of transparency caused by whitening becomes remarkable and the resin sheet becomes unsuitable for use as an optical sheet. When the right crystallization ratio exceeds 2%, the Young's m〇dulUS of the material generally becomes high. If the resin sheet subjected to the embossing treatment is subjected to the stretching treatment thereafter, the load required for the stretching becomes large and the heating temperature during the stretching is required to be set high. If the resin sheet is especially made by the stretching process It has a birefringence and if the resin sheet has a crystallinity of more than 2% by weight before stretching, the desired birefringence is difficult to obtain. In order to process the embossed shape on the resin sheet 10, the resin sheet 10 is maintained before and after. In the crystalline state, the cooling rate [〇c/sec] of the resin sheet 10 becomes an important problem during the period in which the shape of the resin sheet 1 is transferred from the heating roller 11 to the detachment of the resin sheet 10 on the cooling roll 12. Although depending on the material of the resin sheet, it is However, the speed is preferably set to be no slower than 5 < t / sec & not faster than 40 ° C / Sec, and more preferably set to be no slower than 1 {rc / sec and not faster than 30 ° C / Sec. If the cooling rate is slower than At 5 ° C / Sec, it is impossible to prevent excessive crystallization of the resin sheet, resulting in whitening (loss of transparency). If the cooling rate is set to be faster than 40 ° C / se C, the embossing process is degraded and an excellent morphology is obtained. Printing becomes difficult. By achieving the cooling rate in the range described above, the increase in the crystallinity of the resin sheet is suppressed to 5 before and after the embossing shape transfer process is performed by the sheet manufacturing apparatus 1. % or less becomes possible. It is also possible to suppress the crystallization rate of the resin sheet from the emulsified belt to 2 or less. In order to achieve the cooling rate of the resin month 10, the sheet manufacturing apparatus has a weight of 126535.doc - 16 - 200900224 The prescribed inter-roller distance between the heat roller 11 and the cooling roller 12, the feed speed of the endless belt 13, the contact angle of the resin sheet 10 with respect to the cooling roller 12, and the like. The plurality of cooling rolls 12 can be raised. If the distance between the rolls 11 and 12 is too far, it is necessary to increase the feed speed of the endless belt 13 to ensure the cooling rate. However, as the feeding speed of the endless belt 13 is increased, the movement stability of the resin sheet 1 降低 is lowered. So it becomes hard to anticipate

Stable productivity or preheating becomes insufficient and transfer efficiency is lowered. If the distance between the rolls U and U is too close, the heat exchange of the endless belt 13 becomes insufficient, and thus it is difficult to perform the heating and cooling process on the resin sheet 1 at a desired temperature. In a preferred embodiment, when the temperature of the heating roller u is set to be not lower than

When Tg + 60 ° C and not higher than Tg + 90 ° C, when the temperature of the cooling roll 12 is set to 3 ° C and the feed speed of the endless belt 13 is set to 5 m / min, the heating roll 11 is The distance between the rolls between the cooling rolls 12 is set to be not shorter than 丨〇〇mm and not longer than 400 mm. The distance between the rolls varies depending on the material of the resin sheet. For example, the distance between rolls is not shorter than 1 mm and not longer than 2 mm for PET and not shorter than 100 mm for PEN and no longer than 4 inches. The distance between the rolls of 100 mm corresponds to 2 inches at 5 m/min. 〇/3" cooling rate, and the distance between rolls of 4 mm corresponds to a cooling rate of 5 ° C / sec. Obviously by changing the feeding speed of the embossing belt 13 while making the roll and j 2 The distance between the two is guaranteed to obtain the necessary cooling speed. In this case, the distance between the rolls 11 and 12 is preferably no slower than 5 m/min and not faster than 1 〇m. /min. In order to keep the cooling strip 4 cows L, it is preferable to set the total thickness of the resin sheet to 500 μηι or less. The height of the embossed shape and the total thickness of the resin sheet (7) 126535.doc -17- The ratio of 200900224 is preferably 90% or more t. The right-return ratio exceeds 90 〇/〇, causing cracks or the like in the tree sap, and the treatment efficiency is lowered. Next, the use will be as described above. The optical sheet manufacturing method of the present embodiment is described. The amorphous resin sheet i 预设 preset to the supply roller (not shown) is supplied between the zigzag belt 13 and the roll 15. Next, On the heating roller η, the resin sheet ίο is twisted to a temperature at which the dragon is transferred to the glass or higher, and is clamped and Between the shrinking strip 1 3 and the roll 15 5, the embossed shape 13 a of the embossed strip 13 is transferred onto the surface of the resin sheet 1 - the resin sheet to which the zigzag shape is transferred is set to The embossed belt 13 is fed along with the tempering strip 13 toward the chill roll 12. The resin sheet 1 〇 is cooled on the chill roll 12 together with the embossed strip 13 to a temperature below the glass transition temperature. 'After transferring the embossed shape, the resin sheet (7) is rapidly cooled at a cooling rate maintaining the amorphous state. The cooled resin sheet 10 is self-rolled after passing through a rolling point between the rolling belt 13 and the opposite roller 16. The flower strip 13 is detached and wound around a winding roller (not shown). In this manner, an amorphous tree 10 having a embossed shape i 〇 a formed on the surface is manufactured by using the sheet constructed as described above. The apparatus 1 is subjected to embossing treatment of the saplings 10 so that the manufacturing facility can be simplified to achieve cost reduction because the embossing sheets can be continuously produced, so that the manufacturing efficiency can be improved. In the present embodiment, 'corresponding to the glass transition temperature or At a higher temperature, the ten tree moon smear 10 performs embossing treatment, and thereafter the resin is made. It is rapidly cooled to a temperature lower than the glass transition temperature. Therefore, it is possible to maintain the amorphous state while suppressing the crystallization of the sapphire film 10. Further, by using the embossing tape 13 to the resin sheet 10 126535.doc -18· 200900224 The embossing process is performed, and the tree slab ίο is co-cooled with the embossed belt 13 during the period between the transfer process and the cooling process, and the resin sheet 10 is made at a temperature lower than the glass transition degree of the resin sheet. Therefore, the embossing shape transfer performance and the detachment efficiency with respect to the resin sheet 10 can be improved. According to the present embodiment, the desired embossed shape can be formed on the sheet surface at a high transfer rate while suppressing The whitening caused by the crystallization of the amorphous crystalline resin sheet 10. Specifically, in the present embodiment, the embossed shape can be transferred to the resin sheet i 可以 at a high transfer rate of 98% or more. The transfer rate is defined in the present specification as follows. That is, as shown in FIG. 2, the 'transfer rate (five) is represented by (H2/H1) X1 (H), wherein the relatives formed on the resin sheet 10 are verbosely redundant; and J Canku's And H1 represents the height of the embossing shape formed on the embossed belt 13. The inventors of the present invention measured the apex angle 90 by 5G_ by using. The cross-section is an isosceles three. The actual embossing of the resin sheet using the spheroidal extrusion type "...", by the embossing side = and the lamination method using the lamination type of the present invention. Digging -7 also ~,, · ° fruit exhibition is not as shown in Figure 3 reveals that the lamination rate forms a embossed shape compared to the melt extrusion pattern. J The transfer embossed belt 13 has a uniform temperature in the plane of the resin sheet... f affects the processing precision of the shape formed on the surface of the sapphire slab on a large degree of twist. .w 实施 Example t, will add you ten. The temperature of the P-roller is set higher than the phase of the center of the cooling roller! 2, and the points are divided. Therefore, there is a change in the lower than the opposite end. There is a embossed sheet which can be improved in the plane of the embossed belt 13 and has excellent form precision. 夂二—性和制126535.doc -19- 200900224 成== = : Forming a resin-shaped heart with a embossed shape The structure of the (four) sheet 10 having the ridges along the direction of the material is provided. The prism pattern (the embossed shape) of the ninth direction is successively arranged on the surface of the resin sheet H&gt; at a predetermined pitch in the moon direction. The ruthenium sheet 1 can be used as a prism sheet of a liquid crystal display in this state. 右 The right side of the prism ridge direction (the z-axis direction) is stretched at a predetermined stretching rate = the resin sheet 1 shown in Fig. 4 〇, the optical properties of the sheet can be changed. That is, the refractive index (ηΧ) in the plane along the x-axis can be two-way, and the axis The formation of the refractive index difference between the in-plane refractive index (four) and the stretching % can be suitably and with high precision because the resin sheet 1 is in an amorphous state having a crystallinity of 2% or less. In the present embodiment, a resin material having a large refractive index in the stretching direction (such as tantalum and niobium) is used as the material of the resin sheet 1 , and the resin sheet 10 has nx &gt;ny by a stretching process. The refractive index anisotropy. As described above, the resin sheet 10 has an optical output of the polarizing component along the prism array direction, and an optical specificity of the output light amount of the polarizing component along the extending direction of the prism. The polarization component of the ridge direction (x-axis direction) has a repetitive total reflection under the critical angle reflection at the inclined surface of the prism, and the incident side light is set to be larger than the prism-forming surface of the output light. The polarizing component of the prism array direction (γ-axis direction). FIG. 5 is a schematic view showing the structure of a liquid-display device 20 using a resin sheet having a structure as a prism sheet. The liquid crystal display device has , the shoulder panel 2 1 , the first polarized light 126535.doc -20 - 200900224 22A and the first polarizer 22B, the prism sheet ι〇, the diffusion sheet η and the backlight unit 24 sandwiching the liquid crystal display panel 2 The cymbal sheet 10 corresponds to the embossed tree slab 1 G ' formed by the sheet manufacturing apparatus 1 and is used as a modified film for improving the front luminance of the liquid crystal display device. It is used for the light output side of the diffusion sheet 23 for diffusing and outputting the illumination light (backlight) from the backlight unit 24, and has a function of condensing the output light from the diffusion sheet 23 to the front direction. The polarizers 22 and 22b sandwiching the liquid crystal display panel 21 are disposed such that their transmission axes &quot;a&quot; and &quot;b become orthogonal. In the illustrated example, the prism sheet is such that the prism column arrangement direction (the ¥ axis direction) becomes substantially parallel to the transmission axis &quot;a" of the first polarizer 定位 positioned on the side of the backlight unit 24 This example is particularly effective when the prism sheet 10 stretched along the direction of the axis of the prism ridge is used. Since the polarizing component having a large output light amount can effectively enter the liquid crystal display panel 21, the front luminance can be obtained. The prism sheet 10 is not limited to a single prism sheet structure, but a plurality of prism sheets may be laminated. In this case, it is preferred to laminate the prism sheets while the ridge directions of the respective prism sheets are perpendicular to each other. (Second Embodiment) Next, a second embodiment of the present invention will be described. Fig. 6 is a schematic view showing the structure of the sheet manufacturing apparatus 2 of the second embodiment. By using the same reference symbols in Fig. 6 The detailed description of the elements corresponding to the elements of the first embodiment is omitted. In the sheet manufacturing apparatus 2 of the second embodiment, the metal endless belt 14 is wound around a roll 126535.doc • 21 - 200900224 roll 15 And a facing roller 16 facing the back surface of the resin sheet 10 (the surface on which the zigzag shape is not formed). The resin sheet is held during the period from the heating/transfer process to the cooling/disengaging process of the tree u1G and I is contracted between the embossed belt 13 and the ring 4. Although the endless belt is made of a metal such as nickel steel, the material is not limited to metal, and a heat resistant resin such as heat resistant pET may be used. a mirror surface. If necessary, a shape may be formed such that the shape may be transferred and formed to the back surface of the resin sheet 10. Although depending on the material, the thickness of the endless belt 14 is preferably not less than 3 〇 μΓ and It is not thicker than 1000 μm. If the thickness exceeds 1 μm, it is impossible to wind the endless belt around the heating roller and the cooling roller. If the thickness is thinner than 3 μm, it may cause warpage during feeding of the resin sheet 10 or A problem arises in that the crack is caused to cause a strength. In the sheet manufacturing apparatus of the second embodiment constructed as described above, the resin sheet is subjected to a period of time from the heating/transfer process of the resin sheet 10 to the cooling/disengaging process. Clamping and holding on the embossed belt 13 The resin sheet 10 is conveyed in a state between the endless belts 14. Therefore, it is possible to improve the kinematic stability of the resin sheet 1 so that the change caused by the crystallization of the resin sheet 10 can be improved by accelerating the feeding density. Setting flexibility of the cooling rate of white. According to the second embodiment, by performing embossing on the surface of the endless belt 14 and forming a embossed shape thereon, not only on the front surface of the resin sheet 10 but also on the back The embossed shape is formed on the surface with high transfer precision. (Third Embodiment) FIG. 7 illustrates the thermal bonding of two resin sheets i〇s and 126535.doc •22-200900224 lot by using the sheet manufacturing apparatus 2 A laminate 1〇L was produced. In this example, although the embossed shape was transferred to the surface of the resin sheet i〇s by the embossed tape 13, the two resin sheets 10s and lot were clamped and compressed. The embossed belt 13 and the endless belt 14 are thermally bonded and integrated. Therefore, it is possible to easily manufacture the laminate 1L having a predetermined embossing shape formed on the surface. The two resin sheets 10s and 10t are fed together to the sheet manufacturing apparatus. The resin sheets 10s and 10t may be made of the same type of resin sheet or may include different types of resin sheets. Further, three or more resin sheets may be fed simultaneously. [Examples] Examples of the invention will be described, but the invention is not limited to the examples. (Example 1) An amorphous pET sheet having a thickness of 200 μm was formed by a T-die extrusion method (Tg: about 75° 〇. The amorphous PET sheet was fed to the sheet manufacturing apparatus 1 or 2, and was produced under the following conditions. A plurality of prism sheets arranged in an array on the surface of the sheet at an apex angle of 90. The sheet material of the isosceles triangle prism. [Production conditions] Sheet material: amorphous PET Thickness: 200 μπι Prism spacing: 50 μηι Surface temperature of the heating roller 11: 150 ° C Surface temperature of roll 15: 50 ° C Surface temperature of cooling roll 12: 30 ° C Surface temperature of opposing roll 16: 30 ° C Cooling rate of resin sheet: 20 ° C / sec 126535.doc • 23- 200900224 (Piece feed speed: 5 m/min) The line pressure between the heating report 11 and the roll 丨5: 15 kg/cm (Example 2) The thickness of 200 μηι was formed by Dingkai's die extrusion method. Crystalline pen sheet (Tg: about 120 ° C.) The amorphous PEN sheet is fed to a sheet manufacturing apparatus or 2, and is manufactured under the following conditions with a plurality of vertices 90 arranged in an array on the surface of the sheet. Prismatic prism of triangular prism. [Manufacturing conditions] Γ Sheet material: amorphous pen Thickness: 200 pm Column spacing: 1 〇〇μηι Surface temperature of the heating roll u: 190 ° C Surface temperature of the roll 15: 70 ° C Surface temperature of the cooling roll 12: 30 t: Surface temperature of the opposing roll 16: 30 ° C f Resin sheet Cooling rate: 10 ° C / sec, (sheet feeding speed: 3 m / min) Rolling line pressure between the heating roller 11 and the roll 15: l5 kg / em (Example 3) m formed by T-die extrusion method 2〇〇 thickness rT and <amorphous PEN film

Ug. About 120. Hey. The amorphous PEN sheet was fed to the sheet forming apparatus 1 or 2, and manufactured in a number of arrays of LTlfeon under the following conditions. A prismatic sheet of prismatic prisms with an apex angle of 90 on the surface of the sheet. [Manufacturing conditions] 126535.dc), -24- 200900224 Sheet material: Amorphous PEN Thickness. 2 0 〇 pm Prismatic pitch. 300 μιη Surface temperature of the heating roller 11: 190 ° C Surface temperature of the roll 15: 7 Torr.表面 Surface temperature of the chill roll 12: 3 〇. The surface temperature of the 〇 opposed roller 16: 30 ° C The cooling rate of the resin sheet: l 〇 ° C / sec ( ' (sheet feeding speed: 3 m / min) The line pressure between the heating roller 11 and the roller 15: 15 kg/cm (Example 4) An amorphous pen piece having a thickness of 200 μm was formed by a T-die extrusion method (Tg: about 12 Å. 非晶. The amorphous PEN sheet was fed to the sheet manufacturing apparatus 1 or 2, and A prism sheet having a plurality of prisms of an isosceles triangle arranged in an array on the surface of the sheet at an apex angle of 90° was produced under the following conditions. [Manufacturing conditions]

I Sheet material: Amorphous PEN Thickness: 200 pm Prism spacing · 1 〇 μηι

• Surface temperature of heating roll :1: 190°C Surface temperature of roll 15··7〇°c Surface temperature of chill roll 12: 30°C Surface temperature of set 亲16: 30 °C Cooling rate of resin sheet :1 〇°C /sec 126535.doc -25- 200900224 (Piece feed speed: 3 m/min) The nip line pressure between the heating roller 11 and the roll 15: 15 kg/cm (Example 5) by T-die The extrusion method forms an amorphous 吒τ sheet having a thickness of 5 〇〇 4 (Tg: about 75 Å. The amorphous pET sheet is fed to the sheet manufacturing apparatus 丨 or 2, and is manufactured in a plurality of arrays under the following conditions. A prism sheet of an isosceles triangular prism arranged on the surface of the sheet at an apex angle of 90. [Manufacturing conditions]

f sheet material: amorphous PET thickness. 500 μιη prism spacing: 100 μηι The surface temperature of the heating roller 11: 15 〇.表面 Surface temperature of the roll 15: 5 表面 Surface temperature of the cooling roll 12: 3 〇. The surface temperature of the 〇 opposed roller 16: 30 ° C The cooling rate of the resin sheet: 15 ° C / sec k (sheet feeding speed: 5 m / min) The line pressure between the heating roller π and the roll 15: 15 kg / Cm (Example 6) An amorphous ρΕτ sheet having a thickness of 20 μm was formed by a T-die extrusion method (Tg: about 75° 〇. The amorphous PET sheet was fed to a sheet manufacturing apparatus is: and manufactured under the following conditions) A plurality of prismatic prisms arranged in an array on the surface of the sheet having an equilateral triangle of 90° apex angle. [Manufacturing conditions] 126535.doc -26 - 200900224

Sheet material: Amorphous PET Thickness. 20 μηι Prismatic spacing: 20 μπι

Surface temperature of heating roller 11: 15 〇 ° C

Surface temperature of the roll 15: 5 (TC • Surface temperature of the cooling roll 12: 3 (surface temperature of the TC counter roller 16: 30 ° C cooling rate of the resin sheet: 30 ° C / sec Γ) (sheet feed speed: 5 m/min) Line pressure between the heating roll 11 and the roll 15: 30 kg/cm (Example 7) An amorphous pen piece having a thickness of 200 μm was formed by a T-die extrusion method (Tg: about 120. The amorphous PEN sheet is fed to the sheet manufacturing apparatus 2, and a prism sheet having a plurality of prisms of an isosceles triangle arranged in an array on the surface of the sheet at an apex angle 90 is fabricated under the following conditions. [Manufacturing conditions] { Sheet material: Amorphous PEN Thickness: 200 μη Prism pitch: 50 μηι • Surface temperature of the heating roller 11: 200 ° C Surface temperature of the roll 15 · 70 ° C Surface temperature of the cooling roll 12: 50 ° C Opposite roll 16 Surface temperature: 50 ° C Cooling speed of resin sheet: 40 ° C / sec 126535.doc -27 - 200900224 (sheet feeding speed: 5 m / min) 3 〇 kg / cm Rolling between the heating roller 11 and the roll 15 Dotline pressure (Example 8) An amorphous coffee wafer of 15G thickness was formed by T (four) extrusion method. About 120 Å. Amorphous PEN sheets were fed to the sheet. _ Manufacturing apparatus and manufacturing [Manufacturing conditions] (iv) having a plurality of columns are arranged in the form of an isosceles triangle the apex angle of the prism sheet 90. The upper surface of the prism sheet. Under the following conditions

Sheet material: Amorphous PEN Thickness: 15 0 μηι Prismatic spacing: 1 〇〇 μιη Surface temperature of the heating roller 11: 1 8 〇.表面 Surface temperature of the roll 15: 7 表面 Surface temperature of the cooling roll 12: 3 〇 ° c Surface temperature of the opposing roll 16: 3 Torr. Cooling rate of the resin sheet: 3 ° C / sec (sheet feeding speed: 5 m / min) The line pressure between the heating roller 11 and the roll 15: 3 t) kg / cni (Example 9) by T shape The die extrusion method forms an amorphous pEN sheet having a thickness of 200 μm (Tg: about 120° 〇. The amorphous PEN sheet is fed to a sheet manufacturing apparatus, and is manufactured under the following conditions with a plurality of arrays arranged on the surface of the sheet. Angle 90. The prismatic piece of the prism of the isosceles triangle. [Manufacturing conditions] 126535.doc -28- 200900224

Sheet material: Amorphous PEN Thickness: 200 μη Prism spacing: 350 μη Surface temperature of heating roll 11: 190 °C Surface temperature of roll 15: 70 ° C. Surface temperature of cooling pro 1 2: 30 °C opposed roll Surface temperature of 16: 30 ° C Cooling speed of resin sheet: l 〇 ° C / sec ί; (sheet feeding speed: 3 m / m in) nip line pressure between heating roller 11 and roller 15: 1 5 Kg/cm (Example 10) An amorphous pen piece (Tg: about 120 ° C) having a thickness of 300 μm was formed by a T-die extrusion method. The amorphous PEN sheet was fed to the sheet manufacturing apparatus 1 or 2, and a prism sheet having a plurality of prismatic prisms arranged in an array on the surface of the sheet having an apex angle of 90° was fabricated under the following conditions. [Manufacture conditions]

^ Sheet material: Amorphous PEN Thickness: 300 μη Prism spacing: 75 μη Surface temperature of the heating roller 11: 190 ° C Surface temperature of the roll 15: 7 ° ° C Surface temperature of the cooling roll 12: 30 ° C Opposite roll 16 Surface temperature: 30 ° C Cooling speed of resin sheet: l 〇 ° C / sec 126535. doc • 29 - 200900224 (sheet feeding speed: 4 m / min) The line pressure between the heating roller 11 and the roller 15: 5 kg/cm (Example 11) An amorphous pet piece having a thickness of 300 μm was formed by a T-die extrusion method (Tg: about 75° 〇. The amorphous PET sheet was fed to the sheet manufacturing apparatus 1 or 2, and below Under the conditions, a prism sheet having a plurality of prisms of an isosceles triangle arranged in an array on the surface of the apex angle 90 is fabricated. [Manufacturing conditions]

Γ Sheet material: Amorphous PET Thickness: 100 μηι Prism spacing · 1 〇〇pm Surface temperature of heating roller 11: 150 ° C Rolling surface temperature of 15 5: 50 °C Surface temperature of cooling roll 12: 30 ° C Surface temperature of the opposing roller 16: 30 ° C Cooling speed of the resin sheet: 251: / sec ^ (sheet feeding speed: 5 m / min) Heating line pressure between the pro-11 and the roll 丨 5: 5 kg / Em (Example 12) A 10 〇 thickness τ and an amorphous pET sheet (Tg: about 75 ° C) were formed by a T-die extrusion method. The amorphous PET sheet is fed to the sheet-making device 1 2, and a prism having a plurality of prisms of 4 waist triangles which are arranged in the array shape I- TI ^ 顶 on the sheet surface at the apex angle 90 is produced under the following conditions. sheet. [Production conditions] 126535.doc -30- 200900224 Sheet material: amorphous PET thickness. 10 0 μηι Prismatic pitch: 1 〇〇 μιη Surface temperature of the heating roller 11: 15 〇. Surface temperature of the rolling roll 15: 50°c Surface temperature of the cooling roll 12: 30° C Surface temperature of the opposing roller 16: 30 〇 C Cooling speed of the resin sheet: 6 ° C / sec (sheet feeding speed: 2 m / Min) The nip line pressure between the heating roller 11 and the roller 15: 20 kg/cm (Example 13) An amorphous PEN sheet having a thickness of 300 μm was formed by a die-die extrusion method (Tg: about 120° 〇. The amorphous PEN sheet was fed to the sheet manufacturing apparatus 1 or 2, and a prism sheet having a plurality of prisms of an isosceles triangle arranged in an array on the surface of the sheet at an apex angle 90 was fabricated under the following conditions. [Manufacturing conditions] Material: Amorphous pen Thickness: 300 μη Prism spacing: 50 μηι Surface temperature of the heating roller 11: 190 ° C Surface temperature of the roller 15: 8 Surface temperature of the cooling roller 12: 6 (surface temperature of the TC opposing roller 16) : 60 ° C Resin sheet cooling rate: 5 ° C / sec 126535.doc • 31 - 200900224 (sheet feed speed: 3 m / min) Rolling line pressure between the heating roller 11 and the roll 15: 20 kg / cm (Comparative Example 1) An amorphous PET sheet having a thickness of 200 μm (Tg: about 75 ° C) was formed by a T-die extrusion method. The sheet was fed to the sheet manufacturing apparatus 1 or 2, and a prism sheet having a plurality of prisms of an isosceles triangle arranged in an array on the sheet surface at the apex angle 90 was fabricated under the following conditions. [Production conditions] Sheet material: amorphous PET thickness: 200 μηη Prism spacing: 100 μηη Surface temperature of the heating roller 11: 170°C Surface temperature of the roller 15: 4°°C Surface temperature of the cooling roller 12: 30°C Surface temperature of the opposing roller 16: 3 (Cooling speed of TC resin sheet: 3t: /sec I' (sheet feeding speed: 4 m/min) Rolling line pressure between heating roller 11 and roller 15: 15 kg/em (Comparative Example 2) An amorphous pEN sheet having a thickness of 200 μm was formed by a τ-die extrusion method (Tg: about 12 Å. 非晶. The amorphous pEN sheet was fed to the sheet manufacturing apparatus 1 or 2, and manufactured under the following conditions with many arrays Formed on the surface of the sheet with a vertex angle of 90. The prismatic piece of the prism of the isosceles triangle. [Manufacturing conditions] 126535.doc • 32- 200900224

Sheet material: amorphous PEN thickness · 200 pm prism spacing: 1 〇〇 μηη Surface temperature of the heating roller 11: l70 °c Surface temperature of the roller 15: 60 ° C Surface temperature of the cooling roller 12: 30 ° C Opposite roller 16 Surface temperature: 30 ° C Cooling speed of resin sheet: 20 ° C / sec (sheet feeding speed: 5 m / min) Rolling line pressure between heating roller 11 and roll 15 : 15 kg / cm (Comparative Example 3 An amorphous pen sheet having a thickness of 5 60 μm was formed by a T-die extrusion method (Tg: about 12 Å. 非晶. The amorphous pEN sheet was fed to a sheet manufacturing apparatus ^ or ^ and manufactured under the following conditions. The prism sheet of the apex angle of the isosceles triangle is arranged in the form of an array. [Production conditions] Sheet material: Amorphous PEN Thickness: 560 μηη Pitch spacing: 200 Surface temperature of the heating roller 11: 190 ° C Surface temperature of pro 1 5 : 80 ° C Surface temperature of cooling pro 12 : 3 (surface temperature of TC opposing roller 16 : 30 ° C Cooling speed of resin sheet: 3 ° C / sec 126535.doc • 33- 200900224 (Sheet feeding speed: 2 m/min) The nip line pressure between the heating roller 11 and the roll 15: 15 kg/cm (Comparative Example 4) A T-die extrusion method forms an amorphous PET sheet having a thickness of 200 μm (Tg: about 75° 〇. The amorphous PET sheet is fed to the sheet manufacturing apparatus 1 or 2, and is manufactured in a number of arrays under the following conditions. On the surface of the sheet, the apex angle of 90. The prismatic piece of the prism of the isosceles triangle. [Manufacturing conditions]

[Sheet material: amorphous PET thickness: 200 μη Prism spacing: 50 μηι Surface temperature of heating roller 11: 150 ° C Surface temperature of roll 15: 40 ° C Surface temperature of cooling roll 12: 30 ° C Counter roller 16 Surface temperature: 30 ° C Cooling speed of resin sheet: 1 ° C / sec ι (sheet feeding speed: 4 m / min) Rolling line pressure between heating roller 11 and roll 15 : 3 kg / em (Comparative example 5) An amorphous ρΕτ sheet (Tg. about 75 C) having a thickness of 200 μΐ is formed by a T-die extrusion method. The amorphous PET sheet was fed to the sheet manufacturing apparatus 1 and manufactured under the following conditions to have a plurality of apex angles 90 arranged in an array on the sheet surface. The prismatic piece of the prism of the isosceles triangle. [Production conditions] 126535.doc •34- 200900224

Sheet material: amorphous PET thickness. 200 μπι Prismatic spacing: 50 μιη

Surface temperature of heating roller 11: 150 ° C

Surface temperature of roll 15: 4 (TC

Surface temperature of the cooling roll 12: 30 ° C Surface temperature of the opposing roller 16: 30T: Cooling speed of the resin sheet: 10 ° C / sec (sheet feeding speed: 4 m / min) Between the heating roller 11 and the roller 15 Rolling line pressure: 35 kg/cm (Comparative Example 6) An amorphous pET sheet having a thickness of 200 μm was formed by a T-die extrusion method (Tg: about 75° 〇. Amorphous PET sheet was fed to a sheet manufacturing apparatus) Or 2, and under the following conditions, a prism sheet having a plurality of prismatic prisms arranged in an array on the top surface of the sheet surface at the apex angle 90. [Production conditions] Sheet material: amorphous PET Thickness: 200 μm Prism pitch : 50 μηι Surface temperature of the heating roller 11: 15 0 °C Surface temperature of the roller 15 · 40 ° C Surface temperature of the cooling roller 12: 80 ° C Surface temperature of the opposing roller 16: 80 ° C Cooling speed of the resin sheet : 10 ° C / sec 126535.doc - 35 - 200900224 (sheet feeding speed: 3 m / min) nip line pressure between the heating roller 11 and the roll 15: 15 kg / cm (Comparative Example 7) by T-shaped The die extrusion method forms an amorphous sheet having a thickness of 1 ( (Tg: about 75° 〇. feeding the amorphous PET sheet to the sheet manufacturing apparatus) or 2, And a prism sheet having a plurality of prisms of an isosceles triangle arranged in an array on the surface of the sheet at an apex angle of 90. [Production conditions] Sheet material: amorphous PET Thickness: 100 μηι Prismatic pitch: 1 85 Μιη Surface temperature of the heating roller 11··15〇°C Surface temperature of the roll 15: 4〇°C Surface temperature of the cooling roll 12: 50°C Surface temperature of the opposing roller 16: 5〇°c Cooling speed of the resin sheet : l 〇 ° C / sec (sheet feeding speed: 3 m / min) nip line pressure between the heating roller 11 and the roller 15: l5 kg / em (Comparative Example 8) 200 μm by T-die extrusion method Amorphous butadiene sheet having a thickness (Tg: about 75 Å. The amorphous ρ Ε τ sheet is used for the production by the melt extrusion method to have a plurality of apex angles 90 arranged in an array on the sheet surface under the following conditions. Prismatic piece of the isosceles triangle prism. [Manufacturing conditions] 126535.doc • 36- 200900224 Sheet material: Amorphous PET Thickness: 200 μιη Prism spacing: 5 0 μηι Figure collectively shows the first to the thirteenth and the first to The sheet manufacturing conditions of the eighth comparative example. Next, 'measured separately The prism shape transfer rate (%) of the sample manufactured under the manufacturing conditions of the first to third examples and the first to eighth comparative examples, the radius of curvature of the prism corner (the apex angle κ (μιη)), the prism height and The prism ratio (%), the crystallization ratio (%), and the front luminance increase rate of the total thickness of the sheet... The definition of the transfer rate has been previously described. The σ day rate is measured by density calculation by a differential scanning calorimeter (dsc). The positive enthalpy increase rate is the rate of increase in frontal brightness when the prismatic sheet sample and the diffusing sheet of each of the examples and comparative examples are provided under the following conditions: the model is the liquid crystal display as shown in FIG. The configuration, and neither the prismatic sheet nor the diffusing sheet 23 in the darkroom will have a standard value (_) 4 plane brightness by κ〇 heart: 1TM1. The manufactured instrument ^ test results are shown in Figure 11. You are using a three-grade judgmg, and the evaluation criteria include: A better level H is actually compared to the product. Actually, it is not actually a problem-free level and U is actually Unqualified characteristic level &quot;X". The transfer rate of the ith to the first or higher as shown in Fig. η. ❹❹&lt;^之: The same as this has or is smaller, which proves that the excellent transfer... diameter is 5% of the prism pitch. In addition, each sample had 126535.doc -37-200900224 with a reduction of crystallization rate of 1% or less, and no decrease in transparency caused by whitening was observed. With respect to each sample, the front luminance of the liquid crystal display device was improved by 180% or more. Although the first comparative example has a high transfer rate, since the crystallization ratio exceeds 20% and the transparency is lowered by whitening, the increase rate of the front luminance is maintained at 175%. This can be attributed to the heating roller! The surface temperature is higher (over Tg + 90 ° C) and the cooling rate necessary to prevent crystallization is not available. Although the second comparative example can prevent the progress of crystallization, the transfer rate is low and the π degree is insufficient. This is attributable to the fact that the surface temperature of the heating roller u is low (less than Tg + 60 ° C) and the form transfer is insufficient. The resin sheet of Comparative Example 3 was too thick to be 560 μm, so that the cooling rate was insufficient, the crystallization was excessively performed, and the transmittance was lowered due to whitening. Since the nip line pressure between the heating roller 11 and the roll 15 was as low as 3 kg/cm, the fourth comparative example had insufficient form transfer and a high rate of improvement in front surface luminance could not be obtained. On the other hand, regarding the fifth comparative example, since the nip line pressure was as high as 35 kg/cm, stable sheet production was impossible. Further, regarding the sixth comparative example, since the surface temperature of the cooling roll 12 is high (over Tg) and the detachment efficiency is poor, stable production of the sheet is impossible. The seventh comparative example has a high prism height and a total sheet thickness (exceeding the ratio 'so the sheet is torn in the direction of the prism ridge, causing cracks or the like to have poor durability and handling, and stable production is impossible. Since the morphology transfer of the eighth comparative example uses melt extrusion &amp;, the transfer rate is poor and no excellent increase in brightness is observed. 126535.doc -38- 200900224 The cooling rate is not slower than 5 °C/ In the first to the i3th examples of sec and not faster than 40 ° C / see, the surface temperature of the heating roller 11 is not lower than Tg + 6 〇 t: and not higher than Tg + 90 C and the thickness of the resin sheet is 500 μπι or Thinner, it is possible to prevent excessive crystallization of the sheet and the crystallization rate can be suppressed to 20% or less. Since the nip line pressure satisfies the conditions of not less than 5 kg/cm and not more than 30 kg/cm, it is available. Excellent morphological transfer performance and detachment performance to achieve stable productivity. Although the embodiments and examples of the present invention have been described, it is apparent that the present invention is not limited to them, and various modifications are possible based on the technical concept of the present invention. In terms of 'in these embodiments, will be in the volume A resin sheet J 〇 or a resin sheet cut into a sheet size is fed to the sheet manufacturing apparatuses 1 and 2. Alternatively, a melt extrusion apparatus for manufacturing an amorphous resin sheet may be used. The resin sheet is continuously produced and embossed on the front platform side of the sheet manufacturing apparatus. The stretching apparatus for stretching the manufactured embossed sheet in a predetermined direction can be attached to the rear end side of the sheet manufacturing apparatus to be continuously executed. The embossing process and the stretching process. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may be considered within the limits of the scope of the patent application or its equivalent. And other factors. The document of the present invention contains the patent application No. 20〇7_〇69639, which was filed on March 16, 2007 at the Patent Office of the present invention, and Japanese Patent Office, please refer to the subject matter of the Japanese Patent Towel No. __, the entire contents of which are incorporated by reference in the text of 126535.doc -39· 200900224. [Simple description] Figure 1 is a representation for use in accordance with the present invention - Figure 2A and 2B show the main structure of the dried flower ribbon and the embossing plane of the slab of the sheet manufacturing apparatus shown in Fig. 2; Partial enlarged cross-sectional view; Fig. 3 is a graph explaining experimental results of pattern transfer efficiency difference between pattern transfer by the (4) method and pattern transfer by solution extrusion method; A perspective view of the overall structure of a resin sheet (optical sheet) manufactured by the sheet manufacturing apparatus shown in Fig. 1; Fig. 5 is a view showing a contour structure of a liquid crystal display apparatus using the optical sheet shown in Fig. 4 as a prism sheet FIG. 6 is a view showing a outline structure of a sheet manufacturing apparatus for an optical sheet manufacturing method according to a second embodiment of the present invention; FIG. 7 is a view explaining a third embodiment of the present invention. Fig. 8A and Fig. 8B are diagrams showing the temperature distribution of the heating roller and the cooling roller. Fig. 9A to Fig. 9E are diagrams showing the shape of the embossing formed on the surface of the resin sheet. 10 is a diagram showing an example of the present invention Table of the results; and Figure 11 is a table showing the results of the examples in the present invention. [Description of main component symbols] 1 sheet manufacturing apparatus 126535.doc -40- 200900224 2 Sheet manufacturing apparatus 10 Resin sheet/prism sheet 10a embossed shape/prism pattern 10L Laminate 10s Resin sheet lOt Resin sheet 11 Heated report 12 Cooling roll 13 embossed belt 13a embossed shape / geometry design 14 metal endless belt 15 roll 16 opposite roller / backing roller 20 liquid crystal display device 21 liquid crystal display panel 22A first polarizer 22B second polarizer 23 diffuser 24 backlight unit a axis b axis HI embossed shape height H2 formed on embossed belt 13 embossed shape height formed on resin sheet 10 126535.doc -41 -

Claims (1)

200900224 X. Patent application scope: 1. A method for manufacturing a light sheet, which is made of a transparent thermoplastic resin sheet whose surface is designed and processed by a regular geometric shape, and the optical sheet manufacturing method comprises the following steps: Using a metal strip formed on a surface having a geometric design to perform a geometric design process on the resin sheet at a temperature not lower than a glass transition temperature of the resin sheet; The resin sheet subjected to the geometric design processing is rapidly cooled to a temperature lower than the glass transition temperature; and the resin sheet which is rapidly cooled by the left and left is detached from the metal endless processing belt. 2. The method of producing an optical sheet according to the item of the present invention, wherein the resin sheet is made of a transparent crystalline resin. 3. The optical sheet manufacturing method of claim 2, wherein the resin sheet is made of PET, PEN, or a mixture or copolymer of PET and pEN. 4. The optical sheet manufacturing method of claim 1, wherein the temperature is not lower than Tg+6 based on assuming that Tg (°c) is a glass transition temperature of the tree sap. TC is not higher than Tg + 90 ° C. 5. The optical sheet manufacturing method of claim 1, wherein in the step of rapidly cooling the resin sheet, the resin sheet is not less than 5^/sec and not high. The optical sheet manufacturing method of claim 1, wherein the resin sheet has a crystal of 20% or less when the resin sheet is detached from the metal endless processing belt. The optical sheet manufacturing method of claim 1, wherein the crystallization rate increment of the resin sheet is 5% or more before and after the method of performing the optical sheeting 126535.doc 200900224. An optical sheet manufacturing method in which a plurality of resin sheets are input and the plurality of resin sheets are thermally bonded and integrated while transferring a shape by a metal ring processing belt. Wherein the total thickness of the resin sheet is 500 μηι or less. 1〇. The optical sheet manufacturing method of the present invention, wherein the ratio of the height of the transferred portion and the total thickness of the tree-g-g sheet is 9 〇% or less. U. The optical sheet manufacturing method of the request, wherein the film is transferred to the optical sheet The geometry of the resin sheet is designed to be a embossed shape. [12] The method of manufacturing the optical sheet of the invention U wherein the embossing shape transferred to the resin sheet is a prism shape. α. The optical sheet manufacturing method of claim 12. The prism shape transferred to the resin sheet is an isosceles triangle having a 90. apex angle. 14: The optical sheet manufacturing method of claim 13 wherein the prism shape is transferred to the transfer of the resin sheet. The rate is 98 〇 / 〇 or higher. 15 · The optical sheet manufacturing method of the claim item, wherein the 筏 method +, the 食 食 属 % % processing belt ... breaks the temperature higher than the glass transition temperature of the resin sheet The heating roller is set to be lower than the temperature of the resin sheet and the temperature of the temperature is recognized on the 7-inch roller, and is synchronized with the rotation of the heating roller and the cold feed. The optical sheet manufacturing method of item 15, wherein: the resin sheet The treatment is carried out between the roller facing the heating roller and the metal ring processing belt of 126535.doc 200900224, and the pressure of the nip line between the metal core processing belt and the roller is not less than 5 Kg/cm and not more than 3 〇kg/cm. 17. 18. 19. 20. 21. The optical sheet manufacturing method of claim 16, wherein: the % ribbon is wound around the roll and facing the pair of chill rolls And the resin sheet is transferred while being sandwiched and held between the metal endless processing belt and the endless belt. The optical sheet manufacturing method of claim 17, wherein the metal ring processing is performed When the belt is transferred to the resin sheet, a shape is also transferred to the opposite side of the resin sheet by the geometry formed on the surface of the endless belt. The optical sheet manufacturing method of the invention of claim 1, wherein the geometric design processed on the surface of the resin sheet has at least one angular shape. The optical sheet manufacturing method of claim 1, wherein: the roller temperature of the heating roller for transferring the resin sheet is set such that the central portion is higher than the roller temperature at the opposite end portion; and, for conveying the cooling of the β-resin sheet The roll temperature of the rolls is set to be lower at the center portion than at the opposite end portions. An optical optical sheet manufactured by the optical sheet manufacturing method of claim 1 is used as a prism sheet disposed between a liquid crystal display panel and a light source for illuminating the liquid crystal display panel. 126535.doc