TW201213102A - Method for manufacturing resin sheet - Google Patents

Abstract

The present invention provides a manufacturing method of resin sheet for improving the transfer rate. The manufacturing method includes the steps of continuously extruding resin in a hot molten state from a die to produce a continuous resin sheet. The continuous resin sheet made by the sheet manufacturing step has a multilayered structure of plural layers in the thickness direction of the sheet, and has at least two layers, i.e. the shape transfer layer (A) is disposed on the sheet surface on the shape roller side, and the main layer (B) is adjacent to the back side of the shape transfer layer. The ratio of melt flow rate (MFR) of the shape transfer layer (A) (according to JISK7210 standard, the measured value at temperature of 200 DEG C and load of 49N) relative to the MFR of the main layer (B) is above 1.5.

Description

[Technical Field] The present invention relates to a method for producing a resin sheet having a shape on the surface. [Prior Art] A resin sheet having a shape on the surface (surface shape transfer resin sheet) The method is known as follows: using an extruder, extruding a resin from a mold in a heated and molten state to produce a continuous resin sheet (continuous resin sheet), and transferring the shape of the transfer mold using a transfer mold It is printed on the surface of a continuous resin sheet (for example, refer to Japanese Laid-Open Patent Publication No. Hei. No. Hei. In the 5th method, the continuous resin sheet is sandwiched between the first squeeze roller and the second squeeze roller which are separated in the thickness direction of the sheet to be pressed, and the surface formed on the second squeeze roller is rotated. The shape of the stamp is transferred to a continuous resin sheet. DISCLOSURE OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION In recent years, in the case of a resin sheet having a shape applied to the surface, a ratio of a height to a distance between the unit shapes (arrangement interval), that is, a shape having a large aspect ratio is required. However, in the conventional method for producing a resin sheet, the resin is not sufficiently entered with respect to the depth of the transfer mold, and the height of the shape transferred to the resin sheet is not necessarily sufficient. Therefore, it is necessary to increase the maximum height H of the surface shape transferred to the resin sheet, and to print the transfer rate (Η'/Η) with respect to the groove depth η of the transfer mold. Means for Solving the Problems The present invention has been made to solve such a problem, and an object of the present invention is to provide a method for producing a resin sheet in which the transfer rate is improved by the food preparation. The present invention provides a method for producing a resin sheet, comprising: a sheet manufacturing step of continuously extruding a resin in a heated and molten state from a mold to produce a continuous resin sheet; and a transfer step of using a peripheral surface Forming a shape of the transfer mold (4), transferring the transfer mold on the surface of the sheet of the continuous resin sheet; the step of transferring p includes a transfer start step, which uses a squeeze roll and a shape stick to hold and leak the sheet Manufacturing a continuous resin sheet produced by the step, thereby starting to transfer the shape of the transfer mold of the shape roll to the continuous resin sheet; and carrying the step of transferring the transfer mold to the surface of the sheet during the transfer start step The continuous resin sheet of the shape is held in close contact with the circumferential surface of the shape roll, and the peeling step is performed by peeling the continuous resin sheet conveyed in the transport step from the peripheral surface of the shape roll; and manufacturing by the sheet manufacturing step The continuous resin sheet has a multilayer structure having a plurality of layers in the thickness direction of the sheet, and has a shape transfer layer (A) disposed adjacent to the surface of the sheet formed on the shape roll side in the transfer start step, and adjacent to the shape At least 2 layers of the main layer (b) on the back side of the transfer layer; MFR (MFR: Melt flow rate) of the shape transfer layer (A) relative to the MFR of the main layer (B) (with JIS K7210) The ratio of the measured value measured at a temperature of 200 ° C and a load of 49 N is 1.5 or more. According to the method for producing a resin sheet of the present invention, the resin sheet can have a multilayer structure, and the resin (a) constituting the shape transfer layer (A) can have higher fluidity than the resin constituting the main layer (B). (b) Liquidity. Thereby, the resin (a) can be preferably introduced into the transfer mold, whereby the transfer rate can be improved. The shape transfer rate can be improved by using a high-flow resin in the resin (a) constituting the surface layer (A). 157219.doc 201213102 Here, the preferred transfer step includes: a pre-pressing step of squeezing by using a pre-pressing roll and a squeeze roll to sandwich a continuous resin sheet manufactured by a sheet manufacturing step; and preparing for transfer a step of holding the continuous resin sheet extruded in the pre-pressing step in close contact with the circumferential surface of the pressing roller for conveying; and in the transfer starting step, clamping and pressing by the pressing roller and the shape roller The continuous resin sheet conveyed by the preliminary transfer step. Thus, by using the pre-pressing step of the pre-pressing roller and the pressing roller, the thickness of the continuous resin sheet and the sheet temperature can be adjusted at the same time, and the shape transfer rate can be improved. Further, when the glass transition temperature of the resin constituting the shape transfer layer (A) is Tg (a), the surface temperature of the shape transfer layer (A) which is in contact with the peripheral surface of the shape roll is preferably used. For the range of (Tg(a)+5〇)t:~(Tg(a)+i5〇)<>c, the surface temperature of the shape transfer layer (a) which has just been peeled off from the peripheral surface of the shape roll is (Tg(a)_1 〇) °C~(Tg(a)+40)t range. Further, it is preferable that the ratio of the thickness of the shape transfer layer (A) to the thickness of the main layer (B) is in the range of 1/2 GG to 1/1 Q. If the thickness ratio of the resin sheet (the shape transfer layer (A) / the main layer (10) is in the range of 〜 ι / ι 之前 before the transfer shape, the transfer rate can be further improved. Including the heating step 'this heating step is to heat the surface of the shape transfer layer (A) of the continuous resin sheet which is conveyed to the peripheral surface of the squeeze roll immediately after the start of the P-transfer step. Further, preferably In the transfer mold, a plurality of spacers P are disposed at intervals of 200 μm to 500 in the circumferential direction of the shape roller, and are provided with upwardly continuous groove portions in the direction of the rotation axis of the shape roller, and a plurality of groove portions are provided with μηη. In the preferred transfer mold, a groove portion of 157219.doc 201213102 is provided in the direction of the rotation axis of the shape roller, and a plurality of groove portions are arranged in a continuous manner in the circumferential direction of the shape roller. In the stamp, in the direction of the rotation axis of the shape, a plurality of groove portions in the circumferential direction of the shape roller are formed, and the depth Η of the plurality of groove portions is 100 μχη to 500 μιη. 'Better in the transfer mold, in the open> you buckle the rotation axis of the $-roller The ratio of the depth Η of the plurality of groove portions in the circumferential direction of the shape roller in the circumferential direction of the shape roller to the arrangement of the groove portions is 0.3/P of 0.3 or more and 0. Preferably, in the transfer mold, a plurality of groove portions continuous in the circumferential direction of the shape report are provided in the direction of the rotation axis of the shape roller, and the groove portion has a cross-sectional shape in a direction orthogonal to the circumferential direction of the shape report. a substantially semi-elliptical shape or a prismatic shape in a substantially semicircular shape. Further preferably, in the transfer mold, a plurality of groove portions in the circumferential direction of the shape roller (four) are provided in the direction of the rotation axis of the shape roller, and (4) The cross-sectional shape of the shape in which the circumferential direction of the shape is orthogonal is adapted to form the shape of the optical lens. In the transfer mold, a plurality of grooves continuous in the circumferential direction of the shape roller are provided in the direction of the rotation axis of the shape. The arrangement interval of the plurality of groove portions is μ200 μηι to 500 μπι and is equally spaced, and the depth of the groove portion is Η*ι〇〇μιη~5〇〇

Km, the aspect ratio (Η/P) is 0. 3 or more, the cross-section (four) shape of the groove portion in the direction orthogonal to the circumferential direction of the shape roll is substantially a half shape, a field semi-elliptical shape or a prism shape; if it is adapted to form a shape of an optical lens, it is difficult to use the previous manufacture. The method is to produce a surface shape transfer resin sheet with a high transfer rate of 157219. Doc 201213102 material. According to the method for producing a resin sheet of the present invention, a surface shape transfer resin sheet having a high transfer rate can be produced even in the transfer mold having high transfer difficulty. Further, it is preferable that the resin (a) constituting the shape transfer layer (A) is a stupid vinyl resin or an acrylic resin, and the resin (b) constituting the main layer (B) is a stupid vinyl resin or an acrylic resin. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same or equivalent elements are denoted by the same reference numerals, and the repeated description is omitted. The dimensional ratios of the drawings are not necessarily identical to the illustrated objects. (Manufacturing Apparatus of the Known Sheet) Fig. 1 is a schematic configuration diagram of a resin sheet manufacturing apparatus according to an embodiment of the present invention. The resin sheet manufacturing apparatus 5 is an apparatus which can be used in the method for producing a resin sheet according to an embodiment of the present invention. The resin sheet manufacturing apparatus 50 includes a mold 51 in which a resin in a heated and molten state is continuously extruded to obtain a continuous resin sheet 6 , and a continuous resin sheet extruded from the mold 51 from both sides in the thickness direction. The first pressing view (the pressing roll in the present invention) 52 of the 60 and the second pressing roll (the shape roll in the present invention) 52 are. Further, the resin sheet manufacturing apparatus 50 includes a resin inlet 57 for introducing a resin as a raw material, and an extruder 58 for extruding a resin introduced from the resin inlet 57. The resin sheet manufacturing apparatus 50 of the present embodiment has a configuration in which the resin sheet 60 having a multilayer structure laminated in the thickness direction can be manufactured. In the present embodiment, the continuous resin sheet 6 having the two-layer structure shown in Fig. 10 is produced. Explain the situation. 1572l9. Doc 201213102 The first pressing roller 52A and the second pressing roller 52B are configured to be rotatable about mutually parallel rotation axes. The first pressing roller 52A and the second pressing roller 52B are disposed apart from each other in the thickness direction of the resin sheet 60, and the circumferential surfaces of the resin sheet 60 are set in accordance with the thickness of the resin sheet 60. As shown in Fig. 8, Fig. 21, Fig. 22, and Fig. 23, a transfer mold 53 corresponding to the uneven shape transferred to the resin sheet 60 is formed on the circumferential surface of the second pressing roll 52B. In the following, the structure of the resin sheet manufacturing apparatus according to the second embodiment of the present invention is shown in FIG. The resin sheet manufacturing apparatus 50B shown in FIG. 2 differs from the resin sheet manufacturing apparatus 5 shown in FIG. 1 in that it has the third stage in the second stage of the second pressing pair (shape report in the present invention) 52B. Squeeze roller 52C. The third pressing roller 52C has the same configuration as the first pressing roller (the pressing roller in the present invention) 52A. The continuous resin sheet 6 is sandwiched between the third pressing roll 52C and the second pressing roll 52B to be pressed. Fig. 3 is a schematic block diagram showing a resin sheet manufacturing apparatus according to a third embodiment of the present invention. The resin sheet manufacturing apparatus 5〇c shown in Fig. 3 differs from the resin sheet manufacturing apparatus 50 shown in Fig. 1 in that! The nip roller (the squeezing roller in the present invention) 52A is provided with a pre-pressing roller 52D in the preceding stage. The pre-compression roller 52D has the same configuration as that of the first squeezing roller 52A. The continuous resin sheet 60 is sandwiched between the pre-pressing roll 52D and the i-th pressing roll 52a to be pressed. Fig. 4 is a schematic block diagram showing a resin sheet manufacturing apparatus according to a fourth embodiment of the present invention. The resin sheet manufacturing apparatus 5A shown in FIG. 4 differs from the resin sheet manufacturing apparatus 50B shown in FIG. 2 in that the third pressing roll 52 (after the second pressing of the second pressing member) The 压β)β other composition is the same as I572I9 of Figure 2. The resin sheet manufacturing apparatus 50B shown in doc 201213102 has the same configuration. The continuous resin sheet 60 is sandwiched between the fourth pressing roll 52E and the third pressing roll 52C to be pressed. The continuous resin sheet 60 is conveyed in a state in which the shape transfer layer 61 and the fourth pressing roller 52E are in close contact with each other. Fig. 5 is a schematic block diagram showing a resin sheet manufacturing apparatus according to a fifth embodiment of the present invention. The resin sheet manufacturing apparatus 50E shown in FIG. 5 differs from the resin sheet manufacturing apparatus 50C shown in FIG. 3 in that a third pressing roll is provided after the second pressing roll (the shape roll in the present invention) 52B. (post-squeezing roller) 52C. The other constitution is the same as that of the resin sheet manufacturing apparatus 5〇c shown in Fig. 3 . The continuous resin sheet 60 is sandwiched between the third pressing roll 52C and the second pressing roll 52B to be pressed. The continuous resin sheet 6 is conveyed in a state in which the non-shape transfer layer is in close contact with the third squeeze roll 52C. As shown in Fig. 1 to Fig. 3, a plurality of rollers may be arranged adjacent to each other in the vertical direction. Alternatively, as shown in Figs. 4 and 5, a plurality of rollers may be arranged adjacent to each other in the horizontal direction. Further, the plurality of rollers may be arranged adjacent to each other in a direction inclined with respect to the horizontal direction. In the resin sheet manufacturing apparatus 50E shown in FIG. 5, the third pressing roll 52C is disposed in the subsequent stage of the second pressing roll (the shape roll in the present invention) disposed in the third position, so that the resin can be used. The upper half (18-degree portion) of the second pressing roll 52B is in close contact with each other. Further, by bringing the continuous resin sheet into close contact with the third pressing roll 52C, the temperature of the continuous resin sheet can be adjusted. Fig. 20 is a schematic block diagram showing a resin sheet manufacturing apparatus according to a sixth embodiment of the present invention. The resin sheet manufacturing apparatus 5A shown in Fig. 20 differs from the resin sheet manufacturing apparatus 50C shown in Fig. 3 in that it is used immediately. Doc 201213102 The heater 59 that heats the surface of the sheet on the side of the shape transfer layer 61 of the continuous resin sheet 60 before the first pressing roll 52A and the second pressing roll 52B sandwich the continuous resin sheet 60. The resin sheet manufacturing apparatus 50F includes a sheet forming machine 54 that extrudes and shapes a raw material resin into a sheet shape, and forms a group of extruded roll sheets by extruding the extruded continuous resin sheet 60 ( 52d, 52A, 52B), and a pair of extraction rolls (52G, 52H) for extracting a continuous resin sheet 60. The sheet forming machine 54 includes a first extruder (sub-extruder) 58A for heating and melting the raw material resin (a) of the shape transfer layer (VIII) 61, and is used for the main layer (B) 62. a second extruder (main extruder) 58B that is heated and melted by the raw material resin (8), and a feeder table 55 to which the resin melted in the i-th and second extruders 58 and 58B is supplied, and used in The resin mold 51 in the feeder table 55 is extruded in a sheet state. As the first and second extruders 58A and 58B, for example, a known extrusion molding machine such as a single-shaft extruder or a twin-screw extruder can be used. And the second dispensers 58A and 58B are provided with a hopper (resin input port) 57 for introducing a resin into the measuring cylinder of the extruder. As a feeder. 55 is not particularly limited as long as it can be coextruded in a state in which two or more kinds of resins can be supplied to the mold 51. For example, two types of three layers can be used, and that the two types of layers can be used. Two kinds of two-layer distribution type, etc. are known ϋ ί» .  夂33⁄4 邗 von mold system, etc., for the mold for co-extrusion, there is no special use of the metal 』 mold (10) used in the extrusion molding method of φ (the mold e called the broad training target) Continuous tree rides a piece of wood 157219. The width of the doc 201213102 60 is selected, for example, the 3〇〇mm~3〇〇〇mme pre-pressing roll 52D, the second pressing roll 52A, and the second pressing roll 52B are each made of a cylindrical metal (for example, made of stainless steel). Rolls made of iron steel, etc., have a cooling report that has the function of adjusting the temperature of the peripheral surface (surface temperature). A concave transfer mold 53 for forming a semi-elliptical convex portion like a groove 35b (see Figs. 18 and 19) on the continuous resin sheet 6G is provided on the circumferential surface of the second pressing view 52?. As shown in Fig. 2!, in the gravure transfer mold 53, a semi-elliptical groove 7〇 which is a groove portion opposite to the semi-elliptical convex shape 4 35 is formed along the circumferential direction of the second squeeze roll UR. Striped. That is, in the pair of intaglio transfer molds, the ridges 71 between the semi-circumferential grooves 7 〇 and the adjacent semi-elliptical grooves 70 are alternately arranged along the axial direction of the second squeezing roller 52 。. In the semi-elliptical groove 70, a cross section perpendicular to the longitudinal direction (circumferential direction) has a substantially semi-elliptical shape. The depth Η of the semi-elliptical groove is slightly larger than the height η of the semi-elliptical convex portion 35, and is, for example, 1 〇〇 μηι 5 to 5 〇〇 (4) = = 100 μηι to 300 μηι or less. If the depth is too large, the high-flowing polystyrene tree (the resin (4) constituting the shape transfer layer 61) hardly enters the front end of the semi-circular groove 70. Further, the distance between the centers of the semi-elliptical grooves 70 adjacent to each other according to the semi-elliptical convexity (pitch p) is appropriately determined, for example, 2〇〇μηη~5〇〇' is preferably 250 μηι~ 450 μιη', and further preferably 3 〇〇μιη~400 μ, when the pitch is less than 200 Å, the resin is in contact with the second squeezing roller 53 to cure, and as a result, the shape transfer layer is formed. ) The tree of 61 () does not enter the front end of the semi-elliptical groove 7〇 and cannot obtain the target rotation. The other side, when the pitch P exceeds 500 μη, it is useful for 1572l9. Doc 201213102 The eyeglasses of the pitch can be observed on the liquid crystal panel by the naked eye, or there is a pattern of interference fringe patterns such as the liquid crystal panel 10 or the optical film 41. Further, the aspect ratio represented by the ratio (H/P) of the height η of the semi-elliptical groove 70 to the pitch P is, for example, 0. 3 or more, preferably 〇5 to 〇7 ^ In addition, the difference between the height Η of the semi-expanded convex portion 35 and the depth η of the semi-elliptical groove 70 is caused by the transfer of the intaglio transfer mold 53 to the continuous resin sheet. The transfer rate (η, /η) (%) when the material is 6 〇 to form the semi-elliptical convex portion 35. Further, a motor (not shown) is connected to the rotation shafts of the respective pressing rolls (52D, 52A, 52B). The pre-pressing roller 52D and the second pressing roller 52B are rotatable counterclockwise. The first weaving roller 52A can be rotated clockwise. That is, the squeezing reports (52D, 52A, 52B) are "reversible clockwise rotation", "clockwise rotation", and "reversible clockwise rotation" from top to bottom. Thereby, it is possible to perform the synchronous rotation in a state where the continuous resin sheet 6 is sandwiched by all the rolls (52D, 52A, 52B). Further, the conveying speed of the resin sheet 6 can be adjusted by appropriately adjusting the rotational speed of the pressing rolls (52D, 52A, 52B). The diameter of each squeeze (52D, 52A, 52B) is, for example, 1 mm to 500 mm. Further, when a metal roll is used as the pressing roll (52D, 52A, 52B), the surface may be subjected to a plating treatment such as chrome plating, copper plating, nickel plating, or Ni-P plating. Further, it is provided in the vicinity of the first pressing roller 52A for the first! The surface of the shape transfer layer 61 (the surface on the side to be transferred) of the resin sheet 60 conveyed on the squeezing roller 52A is heated by a heater 59. The heaters 59 are disposed to face each other so as to be apart from the circumferential surface of the i-th squeezing roller 52A, and the continuous resin sheet 6 搬 conveyed from the sheet surface side of the shape transfer layer is heated as a heater 1572i9. . Doc • 12· 201213102 59' For example, a known heater such as an infrared heater can be used. Further, the heater 59 may be an in-line heater provided on a route for conveying the continuous resin sheet 6A. The portable heater may be a portable heater that allows an operator to perform measurement by hand. The pair of extraction roller groups (52G, 52H) include a pair of extraction rolls 52G, 52H sandwiching the continuous resin sheet 60 from both sides in the thickness direction. The extraction reports 52G and 52H each comprise a cylindrical metal (for example, stainless steel, iron steel, etc.) roller so that the upper end of the lower extraction 52H is at the same end as the second extrusion (shape report) 52b. The position is set in the height position. As a result, horizontal conveyance can be performed in a state where the continuous resin sheet 60 fed from the second squeeze roll 52B is supported at the height just sent out, so that the conveyance resistance can be reduced. (Continuous Resin Sheet) Next, a continuous resin sheet produced by the production method of the embodiment of the present invention will be described. Fig. 1 is a cross-sectional view showing the layer constitution of a continuous resin sheet according to an embodiment of the present invention. Fig. 1A is a cross-sectional view taken in a direction orthogonal to the continuous direction (X direction) of the continuous resin sheet (y direction, z direction), and shows a state before the surface shape is transferred. The continuous resin sheet 60 has a multilayer structure in which a plurality of layers are laminated in the thickness direction (two directions) of the sheet, and has a shape transfer layer (A) 61 and a main layer (b) 62 which constitute the sheet surface 60a. For example, the surface shape is transferred to the shape transfer layer (A) 61 having the sheet surface 60a. The main layer (B) 62 is disposed adjacent to the back side of the shape-transferred transfer layer (A) 61 in the thickness direction of the sheet. The continuous resin sheet 60 may be composed of two types of two layers as shown in FIG. 10 (shape transfer layer (A) / main layer (B)), or two kinds of three layers (shapes as shown in FIG. 6). Turn 157219. Doc -13· 201213102 Printing layer (A) / main layer (B) / back layer). The continuous resin sheet 6A shown in Fig. 6 is provided with a shape transfer layer (A) 61 constituting the sheet surface 60a, a back surface layer 63 constituting the sheet surface 60b, and a shape transfer layer (A) 61 interposed therebetween. And the main layer (B) 62 of the back layer 63. In the case of two types of three layers, the resin constituting the shape transfer layer 61 and the back layer 63 is the same resin. Fig. 7 is a perspective view schematically showing the constitution of a resin sheet according to an embodiment of the present invention. Fig. 7 shows a resin sheet 30 formed by cutting the continuous resin sheet 60 into a specific size. The resin sheet 30 can be used as the light guide plate 30 or the light diffusing plate 30C mounted on the surface light source devices (backlights) 20 and 20B of the transmissive image devices 1 and 1B (see Figs. 11 and 16) which will be described later. As a surface light source device (backlight) 20, 20B, an LED (light emitting diode) light source is disposed on the side surface 3 3 of the light guide plate 30, and can be used as the side 3 3 of the self-light guide plate 30. The end face that is incident on the front side is illuminated. Further, a light source may be disposed as a light guide plate with respect to the side surface 33 of the resin sheet, or a light source may be disposed on the back surface 32 of the resin sheet to serve as a light diffusing plate (details will be described later). When the resin sheet is used as the light guide plate 30, the back surface 32 of the resin sheet is usually subjected to reflection processing for diffusely reflecting light incident from the side surface. As a method of performing the printing of the reflective processing, in addition to screen printing, ink jet printing can be performed. Alternatively, as a method of reflection processing, the unevenness of the dot shape may be imparted by laser irradiation without performing printing. The surface 31 of the resin sheet 30 is formed with a plurality of convex portions 35 that extend in the i-th direction (the z-axis direction) and are arranged side by side in the second direction (y-axis direction) orthogonal to the second direction. The concave and convex portion 157219 having the convex portion 35 formed on the surface 31. Doc •14· 201213102 The shape is formed by a transfer step described later. (Example of use of light guide plate) Next, a specific use example of the light guide plate will be described with reference to Fig. 11 . Fig. 11 is a cross-sectional view schematically showing the configuration of an embodiment of a transmissive image display device including the light guide plate of the present invention. Fig. 11 is an exploded view of the transmissive image display device 1. (Transmissive Image Display Device) The transmissive image display device 1 includes a transmissive image display unit 10 and a surface light source device 20 disposed on the back side of the transmissive image display unit 1A in Fig. 11 . As shown in FIG. 11, the direction in which the surface light source device 2A and the transmissive image display unit 10 are arranged is referred to as the Z direction (plate thickness direction), and the two directions orthogonal to the two directions are orthogonal to each other. It is the χ direction and the y direction. The transmissive image display unit 10 is, for example, a liquid crystal display panel in which the linear polarizing plates 12 and 12 are disposed on both surfaces of the liquid crystal cell. At this time, the transmissive image display device! For the liquid crystal display device (or the liquid crystal television, the liquid crystal cell 11, the polarizing plates 12, 12, an element used in the transmissive image display device 1 such as the liquid crystal display device of the prior art can be used. As the liquid crystal cell 丨 exemplified TFT (Thin Film) A well-known liquid crystal cell such as a Transistors 'film transistor type' or a STN (Super Twisted Nematic type) (surface light source device) Fig. 12 is a view schematically showing one of the surface light source devices including the light guide plate of the present invention. FIG. 13 is a rear view showing a configuration of another embodiment of a surface light source device including a light guide plate according to the present invention. FIG. 14 is a view schematically showing a surface light source device including the light guide plate of the present invention. A front view of the composition of one embodiment. Figure 157219. Doc • 15· 201213102 11 to 14 , the surface light source device 2 〇 includes a light guide plate (optical sheet) 3 〇 and an LED light source (point light source) disposed opposite to the side surface 33 of the light guide plate 30 . The front side of the light guide plate 30 may be configured such that various films 41 are disposed between the light guide plate 3A and the transmissive image display unit 10. Examples of the various films 41 include a diffusion film, a ruthenium film, and a brightness enhancement film. The (light source) LED light source 22 functions as a point light source of the surface light source device 2A, and as shown in FIG. 12, is disposed opposite to the side faces 33 and 33 extending in the z-axis direction of the light guide plate 30. The LED light source 22 is discretely arranged along the longitudinal direction (y-axis direction) of the side surface 33. The arrangement distance of the LED light source 22 is usually 5 mm to 20 mm, and the point light source may be opposite to the four sides of the light guide plate 3 The arrangement of the method can be arranged on the two sides opposite to the X-axis direction (see FIG. 12) and the two sides facing the y-axis direction, and can be arranged only on the side (see FIGS. 13 and 14). And 'the point light source is not limited to the led light source, but can be other point light sources. Further 'light source It is limited to a point light source, and may be configured by a wired light source (cold cathode tube). The LED light source 22 may be a white LED 'may also be configured with a plurality of LEDs at one place to form a light source unit. For example, as a light source unit, LEDs of three colors of red, green, and blue are arranged in close proximity, and a light source unit having a plurality of LEDs is discretely arranged along the above-described arrangement direction. In this case, it is preferable that different LEDs are as close as possible to each other. As the LED light source, a light source having various light distributions can be used, and the light intensity of the normal direction (z-axis direction) of the LED light source is maximum, and preferably the half value width of the light-emitting intensity distribution is 40. Above the 80 degrees below the 157219. Doc •16· 201213102 Light source for light distribution. Further, as the type of the LED light source, specifically, a Lambertian type, a cannonball type, a lateral emission type, or the like can be cited. (Light guide plate) As shown in FIGS. 12 to 14, the light guide plate 3 is formed in a rectangular shape, and the size of the plan view shape is selected so as to be suitable for the screen size of the display device 1 目标 at the target transmission type, and the two sides of the orthogonal The length (LlxL2) is usually 25 〇 mm X 44 〇 mm or more, preferably 500 mm x 800 mm or more. The plan view shape of the light guide plate 30 is not limited to a rectangular shape and may be a square shape. However, unless otherwise specified, the shape of the light guide plate 30 will be described below. The light guide plate 30 is formed of a light transmissive light transmissive resin and formed into a plate shape. Further, the light guide plate 30 may be in the form of a sheet or a film. Preferably, the thickness T of the light guide plate is 1 · 0 mm or more. 5 mm or less. The light guide plate 30 is provided with one of the opposite main faces (31, 32) in the z-axis direction (thickness direction), one of the opposite side faces 33, 33 in the X-axis direction, and one of the opposite directions in the γ-axis direction. On the sides 34, 34. The main faces (3 1, 32) are formed in a direction crossing the side faces (33, 34). One of the main surfaces (31) facing the main surface in the z-axis direction functions as an exit surface 31 capable of emitting planar light. The exit surface 31 is disposed on the other side (back surface 32) of the transmissive image display unit 10 side, and is disposed on the opposite side of the transmissive image display unit 10. Further, a reflection sheet 42 for reflecting the light in the light guide plate 30 toward the emission surface 31 side is applied to a position opposite to the back surface 32. (Reflection processing) Further, as shown in FIGS. 12 and 13, a reflection processing (for example, screen printing) for diffusing light reflection is applied to the back surface 32 of the light guide plate 30 as a method of performing reflection processing, except for the screen. In addition to printing, inkjet printing is possible. Or 'as a method of reflection processing, without printing, use 157219. Doc •17· 201213102 Laser irradiation gives the unevenness of the dot shape. In the light guide plate 3 of the present embodiment, a dot pattern is printed as a reflection process. In the printing of dot patterns, an ink having diffusing particles for diffusing light is used. Further, the diameters of the dots 38 (printing dots) constituting the dot pattern are coordinated to change as they go away from the light source side. For example, the diameter of the dot near the side of the region near the light source is about 5 16 μηι, so that the diameter of the dot near the center of the panel farthest from the light source is about 9 〇 4 μηι, so that The diameter of the dot in the middle area is about 729 μηη. (Concave-convex shape) Fig. 7 is a perspective view schematically showing a configuration of an embodiment of a light guide plate of the present invention, and Fig. 15 is a perspective view schematically showing a configuration of another embodiment of the light guide plate of the present invention. A plurality of convex portions 35 projecting toward the outer side in the z-axis direction are formed on the exit surface 31. The convex portions 35 extend in the X-axis direction (one direction) and a plurality of them are arranged side by side in the y-axis direction. Further, the shape of the convex portion 35 may be a 稜鏡 shape, a substantially semicircular shape, a substantially elliptical shape, or the like, and is preferably a shape that continuously changes in one convex portion 35 (shape unit), for example, a semicircular shape or A semi-elliptical shape is better than a 稜鏡 shape. Further, it is preferable that the extending direction of the convex portion 35 is parallel to the outgoing direction of the light from the light source. Further, a flat portion may be formed between the adjacent convex portions 35 and 35 in a direction in which the convex portions 35 are adjacent to each other (y-axis direction). Further, the shape of the convex portion may be an optical lens shape. Fig. 8 is an enlarged view showing the convex portion in Fig. 7 from the X-axis direction. Here, the convex portion 35 satisfies ΗχΤ/Ρ2〇. 23···(1) can be. Here, p is the interval (μιη) of the adjacent convex portions 35 and 35, η is the height (μπι) of the convex portion 35, and τ is the sheet thickness (mm). As shown in Fig. 8, the interval ρ is the apex of the adjacent convex portion 35 157219. Doc •18· 201213102 The distance between 35a and 35a. The height H of the convex portion 35 is the distance between the lower end 35b of the convex portion 35 and the apex 35a. The sheet thickness T is the distance between the apex 35a of the convex portion 35 and the back surface 32. (Construction Material of Light Guide Plate) The light guide plate 30 is formed of a light transmissive resin. The refractive index of the transparent resin is usually 1_49~1. 59. As the light-transmitting resin used for the light guide plate 30, a methacrylic resin is mainly used. As the light-transmitting resin used for the light guide plate 3, other resins may be used, and a styrene-based resin may be used. As the light-transmitting resin, an acrylic resin, a styrene resin, a carbonate resin, a cyclic olefin resin, an MS resin (a copolymer of acrylic acid and the present invention), or the like can be used. The light guide plate is applied to a liquid crystal display device (transmissive image display device 1), and an additive such as a light diffusing agent, an ultraviolet absorber, a heat stabilizer, or a photopolymerization stabilizer may be added to the light guide plate 3. (Example of use of light diffusing plate) Next, an example of use of the light diffusing plate will be described with reference to Fig. 16 . Fig. 16 is a side view schematically showing a configuration of an embodiment of a transmissive image display device including the light diffusing plate of the present invention. Figure 17 is a schematic perspective view of the transmissive image display device shown in Figure 16. (Transmissive Image Display Device) The transmissive image display device (7) includes a transmissive image display unit H) and a surface light source device 2 disposed on the side of the transmissive image display unit ι of FIG. b. As shown in FIG. 6, the direction in which the surface light source device 2A and the transmissive image display unit 1 are arranged is referred to as the z direction (plate thickness direction), and the direction orthogonal to the z direction is orthogonal to each other. The two directions are called the X direction and the y direction. Examples of the transmissive image display portion 1G include linear polarizing plates 12 and 157219. Doc • 19- 201213102 12 A liquid crystal display panel disposed on both sides of the liquid crystal unit 11. At this time, the transmissive image display device 1 is a liquid crystal display device (or a liquid crystal television). As the liquid crystal cell 11, the polarizing plates 12, 12, an element used in the transmissive image display device 1 such as a liquid crystal display device can be used. As the liquid crystal cell, a known liquid crystal cell such as a TFT type or an STN type can be exemplified. The surface light source device (backlight system) 20B includes a square-shaped rear wall 23 and a rectangular frame-shaped side wall 24 that is integrally provided from the periphery of the rear wall 23 toward the front (front side), and has a thin box shape in which the front side is open. The resin light box 25; the plurality of linear light sources 22B disposed in the light box 25; and the light diffusing plate 30C that blocks the open surface 26 (front surface) of the light box 25. That is, in the case of the light box 25 of the I-shape, the outline of the open surface 26 is divided by the side wall 24 of the square frame. The linear light source 2 2 B is provided in the space surrounded by the side wall 24 and the rear wall 23. On the inner surface of the wall 2 3 after the lamp phase 25, for example, a reflector 42 for reflecting light incident from the linear light source 22B toward the rear wall 23 side toward the open surface 26 side of the casing is integrally attached (see Fig. 11). The (light source) linear light source 22B is, for example, a cylindrical lamp having a diameter of 2 mm to 4 mm. The plurality of linear light sources 22B are arranged at equal intervals in parallel with each other in a state of being spaced apart from each other with respect to the back surface 32 of the light diffusing plate 30C. From the viewpoint of power saving, it is preferable that the centers of the adjacent linear light sources 22B are spaced apart from each other by a distance Q of 30 mm to 60 mm. Further, from the viewpoint of thinning, it is preferable that the distance R between the back surface 32 of the light diffusing plate 30C (for example, the central portion of the back surface 32) and the center of the linear light source 22B is 10 mm to 20 mm. Further, it is preferable that the ratio of the interval Q to the distance R (Q/R) is 2. 5~4. 0 » Particularly preferred 157219. Doc •20· 201213102 The interval Q is 40 mm to 55 mm and the distance R is 13 mm to 17 mm. Further, the number of the linear light sources 22 is necessarily determined by the size of the light box 25 (the size of the transmission type image display device 1) and the interval Q, and is preferably 6 in the liquid crystal display device 1 of the type 32, for example. ~10 roots. Further, in FIGS. 16 and 17, the linear light source 22A is shown by only five in order to facilitate the illustration. Further, as the linear light source 22A', for example, a known tubular lamp such as a fluorescent lamp (cold cathode tube), a halogen lamp, or a tungsten lamp can be used. Further, as the light source of the surface light source device 20, a point light source such as a light-emitting diode (LED) can be used instead of the linear light source 22A. (Light diffusing plate) Fig. 18 is a schematic perspective view of a light diffusing plate comprising a resin sheet according to an embodiment of the present invention. Fig. 19 is an enlarged cross-sectional view showing the main part of the light box showing the state in which the light diffusing plate is mounted. As shown in Fig. 18, the light diffusing plate 30C is formed in a plate shape of four corners substantially the same as the frame shape of the side wall 24 of the light box 25. The light-diffusing sheet 30C is a light-transmitting multilayer light-diffusing sheet obtained by laminating at least two resin layers in the thickness direction z, and is provided with a shape transfer layer (A) (front layer) 61 containing a high fluidity resin, and The main layer (B) (back layer) 62 containing a low flow resin. Further, the light diffusing plate 30C may contain a light diffusing agent (light diffusing particles) as needed. The light diffusing agent is not particularly limited as long as it has a refractive index different from that of the light-transmitting resin constituting the light diffusing plate 3〇c and can diffuse the transmitted light, and is, for example, an inorganic light diffusing agent. Examples include carbonic acid mother, barium sulfate, titanium oxide, aluminum hydroxide, cerium oxide, glass, talc, mica, white carbon, magnesium oxide, and zinc oxide. These can be implemented with fatty acids, etc. Table 157219. Doc -21· 201213102 The product of surface treatment. In addition, examples of the organic light diffusing agent include styrene polymer particles, acrylic polymer particles, and decane polymer particles. Preferably, the weight average molecular weight is from 500,000 to 5,000,000. The high molecular weight polymer particles and the crosslinked polymer particles having a gel fraction of 1% by mass or more when dissolved in acetone. The above light diffusing agents may be used singly or in combination of two or more. When the light diffusing plate 30C contains a light diffusing agent, the blending ratio of the light diffusing agent is 〇 ii ii parts by weight, preferably 0% by weight based on 1 part by weight of the light transmitting resin. 001~0. 01 parts by weight. Further, the light diffusing agent can be used as a matrix compound of the above-mentioned light transmitting resin. Further, the absolute value of the difference between the refractive index of the light transmitting resin and the refractive index of the light diffusing agent is usually from the viewpoint of light diffusibility. 0·01~0. 20, preferably 〇. 〇2~0. 15. Further, in the light-diffusing sheet 3, C, various additives such as an ultraviolet absorber, a heat stabilizer, an antioxidant, a weathering agent, a light stabilizer, a fluorescent whitening agent, and a process-stabilizing crucible may be added as needed. The ultraviolet absorber is not particularly limited, and examples thereof include a salicylic acid benzene vinegar-based ultraviolet ray absorbing agent, a diphenylene (IV) ultraviolet absorbing agent, a three-spray ultraviolet absorbing agent, and a benzotriazole-based ultraviolet absorbing agent. When the ultraviolet absorber is added, it is preferred to add the ultraviolet absorber 0·b to 3 parts by weight based on the weight of the light-transmitting resin. When it is within the above range, bleed out to the surface of the ultraviolet absorbing agent can be suppressed, and the appearance of the astigmatism plate can be favorably maintained. As a heat stabilizer, there is no particular eye, nor is it a limitation. For example, manganese compound 157219 can be cited. Doc •22· 201213102 Materials, ketone compounds, etc. When a hot sputum agent is added, it is preferred to add a heat absorbing agent at a ratio of 2 parts by weight or less to the ultraviolet absorbing agent in the light-transmitting resin at the same time as the addition of the ultraviolet absorbing agent. A part by weight of the ultraviolet absorber i in the photo-resin is added with a part by weight of a heat stabilizer. Further, the antioxidant is not particularly limited, and examples thereof include a hindered phenol compound and a hindered amine compound. When an antioxidant is added, it is preferred to add 1 to 3 parts by weight of an antioxidant to 100 parts by weight of the light-transmitting resin. Further, as shown in FIG. 19, the light diffusing plate 30C is positioned such that the semi-elliptical convex portion 35 is parallel to the linear light source 22B in the light box 25, and the rear surface 32 of the light diffusing plate 30C abuts against the side wall 24 of the light box 25. 'It is fixed to the light box 25 ° and thus the open face 26 of the light box 25 is blocked by the light diffusing plate 30C. (Constituent Material of Resin Sheet) A light guide plate or a light diffusion plate including a resin sheet is formed of a light transmissive resin. The refractive index of the light transmissive resin is usually 1. 49~1. 59. As the light-transmitting resin used for the light guide plate or the light-diffusing sheet, a mercapto-based acrylic resin can be mainly used. As the light-transmitting resin used for the light guide plate or the light-diffusing sheet, other resins may be used, and a styrene-based resin may also be used. As the translucent resin, an acrylic resin, a styrene resin, a carbonate resin, a cyclic olefin resin, a VIS resin (copolymer of acrylic acid and styrene), or the like can be used. Further, the resin sheet 60 shown in Fig. 10 includes a shape transfer layer (a) 61 and a main layer (B) 62, and the MFR (a) of the resin (a) constituting the shape transfer layer (A) is opposite to the composition. The ratio of MFR(b) of the resin (b) of the main layer (B) (MFR(a)/MFR(b)) is 157219. Doc •23· 201213102 1. 5 or more. MFR (a) and MFR (b) are measured values (mfr: Melt flow rate) measured at a temperature of 200 ° C and a load of 49 N using JIS K7210 as a standard. In the following, when the thickness exceeds, the thickness of the surface layer is not fixed, or a flow mark is easily generated. The resin (a) constituting the shape transfer layer (A) is usually in a molten state by heating. Thermoplastic resin. Preferably, the resin (a) is a styrene resin or an acrylic resin. The resin (a) may be another resin, and may be a carbonate resin, a cyclic olefin resin, an MS resin (a copolymer of acrylic acid and styrene), or the like. Additives such as a light diffusing agent, an ultraviolet absorber, a heat stabilizer, and an antistatic agent may be added to the above resin. The resin (b) constituting the main layer (B) is usually a thermoplastic resin which is heated to be in a molten state. Preferably, the resin (b) is a styrene resin or an acrylic resin. The resin (b) may be another resin, and may be a carbonate tree ruthenium, a cyclic olefin resin, an MS resin (a copolymer of acrylic acid and styrene), or the like. Additives such as a light diffusing agent, an ultraviolet absorber, a heat stabilizer, and an antistatic agent may be added to the above resin. (Example of MFR value) When the resin (4) constituting the shape transfer layer (A) and the resin (b) constituting the main layer (B) are both styrene resins, mfr(4) can be made 5 g/l 〇 min 15 g/10 min, making MFR(b) 0. 5 g/10 min~2. 0 g/10 min. Further, when both the resin (a) constituting the shape transfer layer (A) and the resin (b) constituting the main layer (B) are acrylic resins, MFR (a) can be made 0. 4 g/10 min~3. 0 g/l〇 min, making MFR(b) 0. 1 g/l〇 min~2. 0 g/min. (Method for Producing Resin Sheet) A resin sheet according to an embodiment of the present invention 157219. Doc •24· 201213102 The manufacturing method will be explained. Fig. 9 is a flow chart showing the procedure of a method for producing a resin sheet according to an embodiment of the present invention. The method for producing a resin sheet of the present embodiment can be carried out, for example, by using the resin sheet manufacturing apparatus 50 shown in Figs. 1 to 5 and Fig. 20 . As shown in Fig. 9, the method for producing a resin sheet according to the present embodiment includes a sheet production step (S1) in which a resin in a heated and molten state is continuously extruded from a mold to form a continuous resin sheet, and a peripheral surface is formed. There is a transfer mold (shape roll) to transfer the transfer mold to the transfer step of the continuous resin sheet (S2). (Sheet Manufacturing Step) In the sheet manufacturing step, the resin is continuously extruded from the mold 51 in a heated and molten state to produce a continuous resin sheet 6?. The resin which is used in the production method of the present invention is a thermoplastic resin which is heated to be in a molten state. Usually, the extrusion molding method is the same, and the shaft extruder may be double and heat, and the molten resin is used as a mold 51 for continuously extruding the above resin in a heated and molten state, and can be used and extruded. The metal mold or the like which is formed by the molding method is used to extrude the resin from the mold 51 in a heated and molten state, and the extruder 58 can be used. Extruder 58 can be single

The 157219.doc layer structure is thus supplied to the mold 51 in a 2-state for coextrusion. For the two types of co-extrusion, the resin is supplied to the mold 51 via the table, for example, using a known method. • 25- 201213102 Further, the thickness of the continuous resin sheet 60 may be appropriately adjusted depending on the use of the obtained sheet. For example, when the continuous resin sheet 6 is used as the light guide plate 3 or the light diffusion plate 30C, the thickness of the sheet is preferably in the range of 丨〇 mm or more and 4.5 mm or less. (Transfer Step) The transfer step (S2) includes the steps of: a transfer start step (S3) 'by pressing with a first press squeegee) 52A and a second squeezing roll (shape roll) 52B The continuous resin sheet 6 manufactured by the material manufacturing step (S1) is sandwiched and pressed; and the transfer step (S4) is performed to obtain the continuous resin sheet 60 and the shape roll 52B obtained by the press start step (S3). In the peeling step (S5), the continuous resin sheet 60 conveyed in the transporting step (S4) is peeled off from the peripheral surface of the shape pro 52B (transfer mold 53). (Transfer start step) As shown in Fig. 1, by the transfer start step (S3), the first press roll 52A and the second squeeze roll 52B simultaneously slide the sheets from both sides in the thickness direction of the sheet. The continuous resin sheet 6 obtained in the production step (S1) is pressed and pressed. At this time, when the glass transition temperature of the resin (4) constituting the shape transfer layer (A) is Tg (a), the surface temperature of the continuous resin sheet 60 to be successively connected to the second squeeze roll 52B is preferably ( Tg (a) + 50 ° C) ~ (Tg (a) + 150 ° C) range. The adjustment of the surface temperature can be adjusted by changing the set temperature of the crucible 58 and changing the set temperature of the mold 51. Further, the surface temperature of the continuous resin sheet 60 can be measured using an infrared thermometer. Further, a heating step may be performed which is performed on the surface of the sheet of the shape transfer layer 61 of the continuous resin sheet 60 which is conveyed in close contact with the circumferential surface of the first pressing roller 52A when the transfer start step is performed. heating. 157219.doc -26-201213102 In the transfer start step (S3), the shape of the transfer mold 53 based on the surface formed on the second squeeze roll (shape roll) 52B is transferred to the continuous resin sheet 6〇. . Further, in the present invention, the second pressing roller 52b having the transfer mold is also referred to as a transfer roller. The transfer mold provided on the surface of the transfer roller is pressed against the surface of the continuous resin sheet 60, and its surface shape is transferred as a reverse mold to the continuous resin sheet 60. As the first and second pressing rolls 52A and 52B, a metal roll including a metal such as stainless steel or steel is usually used, and the diameter thereof is usually ι mm to 500 mm. When a metal roll is used as the first and second pressing rolls 52A and 52B, the surface thereof may be subjected to plating treatment such as chrome plating, copper plating, nickel plating, or nickel-phosphorus plating. Further, the surface (peripheral surface) of the i-th squeezing roller 52A may be a mirror surface, or may be a transfer surface on which irregularities such as embossing are applied. (Transporting step) The transporting step (84) is a step of transporting the second pressing roller 52B in a state in which the continuous resin sheet 6A and the second pressing roller 52B are in close contact with each other. (Peeling Step) The peeling step (S5) is a step of peeling the continuous resin sheet 6 from the circumferential surface of the second extrusion 轺 > 52B. At this time, it is preferable that the surface of the resin (4) of the continuous resin sheet 60 which has just been peeled off from the second pressing roll 52B is the glass transition temperature Tg(a) of the resin (a) constituting the shape transfer layer (A). The temperature is in the range of (Tg(4)_1〇)£>c~(Tg(a)+4〇)〇c. When the surface temperature of the resin (a) is lower than this range, the production efficiency is no longer deteriorated. When the surface temperature of the resin (a) is higher than the above temperature range, the shape transferred to the continuous resin sheet 60 is easily returned to the original state due to heat. Therefore, the transfer rate is liable to be deteriorated. The tree which has just been peeled off from the second squeeze roll 52b 157219.doc -27· 201213102 The surface temperature of the grease (a) is more preferably in the range of (Tg(a)_5) °C~(Tg(a)+1〇)〇c The scope. Further, 'when the glass transition temperature of the resin (b) constituting the main layer (B) is Tg(b), the glass transition temperature Tg(a) of the resin (a) constituting the surface layer (A) may be (Tg ( b) +2) ° C < Tg (a) ° C < (Tg (b) + 20) ° C range. Further, after peeling from the second pressing roll 52B, the ratio of the thickness of the shape transfer layer (A) to the thickness of the main layer (B) is in the range of 1/2 Å to 1/1 Torr. When the thickness ratio is smaller than 1/200 and the thickness ratio is larger than 1/1, the improvement in the transfer rate is insufficient. (Transfer Mode) Fig. 8 is a cross-sectional view schematically showing a concave portion formed in a transfer mold and a convex portion formed in a resin sheet. The transfer mold 53 includes a plurality of recesses provided on the surface of the shape roller 52B. For example, the recessed portion is continuously formed in the circumferential direction of the shape roller 52b. The distance between the concave portions is usually 3 〇 μη or more, preferably 50 μm or more. However, in the production method and manufacturing apparatus of the present invention, it is preferably concave. The interval between ρ is 2〇〇 pm~5〇〇 μπι, and the groove depth η of the concave portion is 100 μπι to 500 μιη. The interval (ρ) between the recesses refers to the distance between the groove portions of the adjacent concave portions (bottom portions), and the groove depth of the concave portion refers to the distance from the circumferential surface of the shape roller 52Β to the groove portion (bottom portion) of the concave portion. . Further, the ratio of the groove depth (Η) of the concave portion to the interval (Ρ) between the concave portions, i.e., the aspect ratio (Η/P) is, for example, 〇.3 or more, preferably 〇 4 to 〇 7. Further, the cross-sectional shape of the concave portion of the transfer mold 53 may be a semicircular shape or a semi-elliptical shape. Further, it may be a V-shaped shape having an acute angle corresponding to the shape of the crucible. As a method of producing the transfer mold, the surface of the transfer roller including the stainless steel or the steel 157219.doc • 28·201213102 iron is subjected to, for example, chrome plating, copper plating, nickel plating, nickel plating, or the like. The key surface may be processed by a diamond blade, a metal whetstone, or the like by laser processing, laser processing, or chemical etching to process the shape, but is not particularly limited to these methods. Further, after the transfer mold is formed, for example, the surface of the transfer roller can be subjected to a mineralization treatment such as chrome plating, copper plating, nickel plating, plating-can, or the like, at a level that does not impair the accuracy of the surface shape. In order to form the groove shape of the transfer mold more precisely and reproducibly, it is preferably a combination of a lathe and a diamond blade. The thickness of the chrome plating on the copper is preferably 5 μm or less, and more preferably 2 Below μηι. (Modification of Manufacturing Method of Resin Sheet) As a modification of the production method, for example, after the transfer step (S4), the second extrusion step can be performed. The second extrusion step can use the resin sheet shown in FIG. The manufacturing apparatus 5〇B is implemented. In the second extrusion step, the continuous resin sheet 6〇 conveyed by the conveying step (84) is held by the second pressing roll (shape roll) 52β and the third pressing roll 52C, and is pressed. The continuous resin sheet 6 obtained by extruding in the second extrusion step is peeled off from the second pressing roll (peeling step), and is conveyed in close contact with the circumferential surface of the third pressing roll 52C. The peripheral surface of the pressure roller 52C is peeled off. Further, as another modification of the manufacturing method, for example, a pre-pressing pre-compression step may be performed before the transfer start step (S3). The pre-pressing step can be carried out using the resin sheet manufacturing apparatus 5〇c shown in Fig. 3 . In the pre-pressing step, the continuous resin sheet 6 manufactured by the sheet manufacturing step (S1) is sandwiched by the pre-pressing roller 52D and the first pressing roller 52A, and is pressed in advance. The continuous resin sheet 60 obtained by extrusion and the circumferential surface of the first squeeze roll 52A are placed in close contact with each other, and are transported 157219.doc -29·201213102 (prepared transfer step), and the first and second squeeze rolls 52A, 52B are used. The transfer start step (S3) is carried out, which has an effect on the improvement of the transfer rate, and is preferably used in the vicinity of the first squeeze roll 52A, and can be provided for the first squeeze report 52 A. A heater that heats the surface of the continuous resin sheet 60 that has been transferred. The heater is heated to the continuous resin sheet conveyed from the surface side so as to be spaced apart from the circumferential surface of the first pressing roller 52A. As the heater, for example, a known heater such as an infrared heater can be used. (Function) In the method for producing a resin sheet of the present invention, the surface layer of the resin (a) is made to have a lower fluidity by merely making the shape transfer layer have a relatively good fluidity. The portion easily flows into the shape of the concave portion of the transfer mold, and it is easy to maintain the shape of the resin flowing into the shape of the concave portion of the transfer mold 53 after being peeled off from the transfer mold 53. Thereby, the shape transfer rate can be improved. Therefore, it is possible to form a surface shape having a high aspect ratio on the resin sheet. (Embodiment) Hereinafter, the present invention will be described in more detail with reference to Examples 1 to 4, but the present invention is not limited to the examples. (Example 1 and Comparative Example 1) Sheets of Example 1 and Comparative Example 1 were produced using the resin sheet manufacturing apparatus 50C shown in Fig. 3 . The conditions of the is device 50 used are shown below. The screw diameter of the extruder 58 was set to 40 mm, and the extrusion amount of the extruder 58 was set to 20 kg/hr. The line speed was set to 0.32 m/min, and the sheet width (length in the γ direction) was set to 25 cm. The shape of the transfer mold as the second squeeze report 52B is set to a pitch p of 6 〇〇 μΓη and a depth η of 300 μm. The roll temperature (pre-press roll 52D / first press roll 52 Α / second press roll 52 Β) was set to 80 ° C / 80 eC / 80 ° C. 157219.doc •30·201213102 In Example 1, PMMA ((P〇lymethylmethacrylate) sheet having a sheet thickness of 4 mm was produced by extrusion molding (sheet manufacturing step). In the first embodiment, a resin sheet having a three-layer structure is produced using two kinds of resins (see Fig. 6). A copolymer of methyl methacrylate and methyl acrylate is used for the resin (a) constituting the surface layer (A). The specifications of a) are as follows: Weight ratio. Methyl methacrylate / Acrylic vinegar = 98 / 2 MFR (a) : 1.5 g / l 〇 min (20 (TC, 49 N load conditions) Glass transfer temperature Tg(a) : 107°C Thickness (one side): 0.1 mm Further, the MFR of the resin (a) was measured under a load of 23 (TC, 37 N (3.8 kgf), which was 9.4 g/10 min. In the resin (b) of the layer (B), a copolymer of methyl methacrylate and decyl acrylate is used. The specifications of the resin (b) are as follows. Weight ratio: methacrylic acid/I/acrylic acid= 94/6 MFR(b) : 0.24 g/10 min (20 (TC, 49 N load condition) Glass transition temperature Tg(b) : 102eC Thickness: 3.8 mm In addition, at 23 (TC, 37 N (3.8 kgf) load The MFR' of the resin (b) was measured to be 1.5 g/10 min. The ratio of the thickness of the surface layer (A) to the thickness of the main layer (B) was 1/38. In Comparative Example 1, 'a single layer was prepared using the above resin. The resin sheet of the structure is the same as the above-described embodiment except that the three-layer structure is changed to a single-layer structure. 0 157219.doc 201213102 In the first embodiment, the surface of the resin sheet which has just been peeled off from the second pressing roll 52B The temperature was l〇5 ° C, and the shape height H' at this time was 183 μm, and the shape transfer rate (=H7H) was 61%. In Comparative Example 1, the resin sheet which was just peeled off from the second squeeze roll 52Β The surface temperature was 10 ° C, and the shape height ΙΓ was 168 μm at this time, and the shape transfer rate (= H7H) was 56%. Table 1 below shows the test conditions and test results of Example 1 and Comparative Example 1. The case where the shape transfer rate was 60% or more was judged as acceptable. [Table 1]

Layer constituting resin, thickness linear velocity roller speed sheet temperature shape roll inlet/shape roll shape height transfer rate Example 1 Shape transfer layer: Resin (4) 0.32 80°C 203〇C 183 μτη 2 types (single side: 0.1 Mm) m/min 80°C /105°C 61% 3 layers Main layer: Resin (b) 80°C (3.8 mm) Comparative Example 1 Resin (b) 0.32 80°C 204〇C 168 μτη Single layer (0.4 Mm) m/min 80 ° C / 105 ° C 56% 80 ° C (Examples 2, 3, Comparative Example 2) Examples 2, 3 and Comparative Example 2 were produced using the resin sheet manufacturing apparatus 50C shown in Fig. 3 The above sheet. The conditions of the manufacturing apparatus 50C to be used are shown below. The screw diameter of the extruder 58 was set to 120 mm, and the extrusion amount of the extruder 58 was set to 700 kg/hr. In Examples 2 and 3, the linear velocity was set to 2.85 m/min, and in Comparative Example 2, the linear velocity was set to 2.83 m/min. In Examples 2, 3 and Comparative Example 2, the sheet width (length in the Y direction) was set to 135 cm. As the shape of the transfer mold of the second pressing roll 52B, the pitch P was set to 400 μm and the depth Η was set to 222 μm. In Example 2 of 157219.doc -32-201213102, the roll temperature (pre-press roll 52D / first press roll 52A / second press roll 52B) was set to 80 ° C / 85 ° C / 97 ° C ' In Example 3, it was set to 80. 〇/85. 〇: / 87 ° C, in Comparative Example 2, it was set to 80 ° C / 85 ° C / 95 ° C. In Examples 2 and 3, a PMMA sheet having a sheet thickness of 3 mm was produced by extrusion molding (sheet manufacturing step). In the examples 2 and 3, a resin sheet having a three-layer structure was produced using two kinds of resins (see Fig. 6). In the resin (a-2) constituting the surface layer (Α), a copolymer of methyl methacrylate and decyl acrylate was used. The specifications of the resin (a-2) are as follows. Weight ratio: methacrylic acid methyl vinegar / acrylic acid vinegar = 9 5/5 MFR (a): 1.4 g/10 min (20 (TC, 49 N load conditions)

Glass transition temperature Tg (a): 102 ° C Thickness (one side): (Example 2) 0.2 mm: (Example 3) 0.2 mm Further, at 230. (:, 37 Ν (3·8 kgf) The MFR of the resin (a-2) was measured under a load condition of 1 〇.〇g/l〇min. In the resin (b) constituting the main layer (B), used Copolymer of methacrylate methacrylate and methyl propyl acrylate. The specifications of the resin (b) are as follows. Weight ratio: thiol methacrylate / acrylic acid methyl hydrazine = 94/6 MFR (b): 0.24 g/10 min (200 ° C, 49 N load condition) Glass transition temperature Tg (b): 102 ° C Thickness · (Example 2) 2.6 mm: (Example 3) 2.6 mm Further, at 230 ° C The MFR of the resin (b) was measured under a load of 37 N (3.8 kgf), and was 1.5 g/l 〇 min. In Comparative Example 2, a resin sheet having a single-layer structure was produced using the above resin (b). 157219.doc • 33·201213102 In the second embodiment, the surface temperature of the resin sheet which has just been peeled off from the second pressing roll 52B is 124° C., and the shape height Η is 155 μm, and the shape transfer rate (=H7H) is 61%. In Example 3, the surface temperature of the resin sheet which was just peeled off from the second pressing roll 52A was 119 ° C, and the shape height Η was 167 μm, and the shape transfer rate (=H7H) was 75. %. In Comparative Example 2, just after the second extrusion The surface temperature of the 52 Å peeled resin sheet was 123 ° C, and the shape height Η was 127 μm at this time, and the shape transfer rate (=H'/H) was 57%. Table 2 below shows Examples 2, 3 and comparison. The test conditions and test results of Example 2 were judged to be acceptable when the shape transfer rate was 60% or more. [Table 2]

Layer Composition Resin, Thickness Linear Velocity Roller Velocity Sheet Temperature Shape Roller Entrance / Shape Roller Shape Height Transfer Rate Example 2 Shape Transfer Layer: Resin (a-2) 2.85 80 °C 211. . 156 μηη 2 species (single side: 〇·2 mm) m/min 85〇C /124〇C 70% 3 layers Main layer: Resin (b) 97〇C (2.6 mm) Example 3 Shape transfer layer: Resin (a-2) 2.85 80°C 212〇C 167 μηη 2 types (single side: 0.2 mm) m/min 85〇C /119°C 75% 3 layers Main layer: Resin (b) 87〇C (2.6 mm Comparative Example 2 Resin (b) 2.83 80 ° C 21 l〇C 127 μη Single layer (3.0 mm) m/min 85 °C /123〇C 57% 95〇C (Example 4, Comparative Example 3) The resin sheet manufacturing apparatus 50C shown in 3 produced the above-mentioned sheets of Example 4 and Comparative Example 3. The conditions of the manufacturing apparatus 50C used are shown below. The screw diameter of the extruder 58 was set to 120 157219.doc -34 - 201213102 mm, and the extrusion amount of the extruder 58 was set to 1 〇〇〇 kg / hr. In Example # _, the linear velocity was set to 4.08 m/min, and in Comparative Example 3, the linear velocity was set to 3.52 m/min. The sheet width (length in the γ direction) was set to i20 cm in Example 4 and 135 cm in Comparative Example 3. As the shape of the transfer mold of the first can roller 52B, the pitch p was set to 4 〇〇 and the depth η was set to 222 μη. In Example 4, the roll temperature (pre-press roll "by the ith press roll 52A / the second press roll 52B) was set to 8 (rc/85t/87t, and in Comparative Example 3, it was set to 80 °C). /85 ° C / 98 ° C. In Example 4, a PMMA plate having a sheet thickness of 3 mm was produced by extrusion molding (sheet manufacturing step). In Example 4, a three-layer structure was produced using two kinds of resins. A resin sheet (see Fig. 6). A copolymer of methyl methacrylate and methyl acrylate is used for the resin (a_2) constituting the surface layer (A). The specifications of the resin (a_2) are as follows. : mercapto methacrylate / methyl acrylate = 95/5 MFR (a-2): 1.4g/10min (20 (TC, 49N load conditions)

Glass transition temperature Tg(a) : 1 〇 2 ° C Thickness (one side): 0.15 mm In addition, the MFR ' of the resin (a-2) was measured at 230 ° C, 37 N (3.8 kgf) load. ·〇g/i〇min. In the resin (b) constituting the main layer (B), a copolymer of decyl methacrylate and methyl acrylate is used. The specifications of the resin (b) are as follows. Weight ratio · Methyl methacrylate / methyl acrylate = 94 / 6 MFR (b) : 0.24 g / 10 min (200 ° C, 49 N load conditions)

Glass transition temperature Tg(b): 102°C 157219.doc ·35· 201213102 Thickness: 2.7 mm Further, the MFR of the resin (b) was measured at 230 ° C under a load of 37 N (3.8 kgf), which was 1.5 g / 10 min. In Comparative Example 3, a resin sheet having a single layer structure was produced using the above resin (b). In the fourth embodiment, the surface temperature of the resin sheet which was just peeled off from the second pressing roll 52B was 135 ° C, and the shape height Η was 155 μm and the shape transfer rate (= H7H) was 70%. In Comparative Example 3, the surface temperature of the resin sheet from which the Gangka J was peeled off from the second pressing roll 52 was 131 ° C, and the shape height Η was 127 μm, and the shape transfer rate (= H7H) was 57°. /〇. Table 3 below shows the test conditions and test results of Example 4 and Comparative Example 3. The case where the shape transfer rate was 60% or more was judged to be acceptable. [table 3]

Layer constituting resin, thickness linear velocity roll speed sheet temperature shape roll inlet/shape roll shape height transfer rate Example 4 Shape transfer layer: Resin (a-2) 4.08 80°C 255 °C 155 μιη 2 types ( One side: 0.15 mm) m/min 85 °C / 135. . 70% 3 layers Main layer: Resin (b) 87〇C (2.7 mm) Comparative Example 3 Resin (b) 3.52 80 °C 222. . 127 μιη single layer (3.0 mm) m/min 85〇C /131°C 57% 98〇C line speed (4.08 m/min) fast and the roll temperature (87 °C) is low. Example 4 is higher than the comparative example. 3 shape transfer rate (70%). Next, the present invention will be described based on Examples 5 and 6 and Comparative Example 4, 157219.doc-36-201213102, but the present invention is not limited to the following examples. (Material of Resin Sheet) As the raw material of the resin sheet, the following materials (1) to (2) were prepared. (1) Amorphous resin (main layer (B)): low-flow polystyrene resin ("HRM40" manufactured by Toyo Styrene Co., Ltd.) MFR(b) : 1·3 g/l〇min (2〇 〇°C, 49 N load conditions) (2) Amorphous resin (shape transfer layer (A)): high-flow polystyrene resin ("G490N" manufactured by Sakamoto Polystyrene Co., Ltd.) MFR (a) (7) 〇g/l〇min (20 (TC, 49 N load condition) (The configuration of the apparatus for manufacturing a resin sheet) A device having the same configuration as that of the resin sheet manufacturing apparatus shown in Fig. 2A is used. A chrome-plated mirror cooling roll 0 was prepared as a squeezing roll ', and as a transfer die attached to a squeezing roll, a transfer mold A shown in Table 4 was prepared. In the transfer mold A, half The groove portions having an elliptical shape are formed at equal intervals in parallel along the circumferential direction of the squeeze rolls. Further, in Table 4, "pitch P" and "depth H" are values defined by the above embodiments. Table 4] Shape Spacing P Depth Η Aspect Ratio

Item (Example 596 and Comparative Example 4) First, each of the extruders to the main extruder (the main extruder field of the multi-layer extruder of the screw straight mV 彳 extruder (screw diameter 20 mm)) The amorphous resin shown in Table 2 was supplied and melt-kneaded at a cylinder temperature of 210 ° C to 250 ° C in an amount of 157,219.doc •37·201213102, and then supplied to a two-layer distribution type feeder table. The T-die with a width of 300 mm is used to extrude the resin in the feeder table into a sheet shape at a T-die temperature of 24 (TC to 250 ° C, so that the resin supplied from the sub-extruder to the feeder table becomes a shape-turning The printing layer (high fluidity resin layer) 61, the resin supplied from the autonomous extruder to the feeder table becomes the main layer (low fluidity resin layer) 62. Then, the pre-pressing roller (mirror cooling roller) 52D and the first The squeeze roll (mirror cooling roll) 52A sandwiches the extruded continuous resin sheet 60, and is conveyed while being wound around the surface of the first press roll 52A, and the first press roll 52A and the second squeeze are carried out. The pressure roller (shape roller) 52B is nipped and wound around the surface of the second squeeze roller 52B, and the extraction rollers 52G and 52H are extracted from the second. The continuous resin sheet 60 from which the squeezing roller 52B is peeled off, thereby obtaining a surface shape transfer resin sheet obtained by transferring a highly fluid resin layer into a concave shape. Further, the obtained resin sheet is obtained from the above formula. The shape transfer rate T (= H7H). The results are shown in Table 5. [Table 5] Layer constitution resin, thickness linear velocity roll speed sheet temperature shape roll inlet/shape roll/with or without heater shape height transfer rate Example 5 Shape transfer layer: Resin (a) 1.1 80°C 162〇C 2 species (0.1 mm) m/min 70°C /108°C 76% 2 layers Main layer: Resin (b) 95〇C / no heating (1.9 mm) 157219.doc •38· 201213102 Example 6 Two 2-layer shape transfer layer: Resin (a) (〇1 mm) Main layer: Resin (b) (1.9 mm) 1.1 m/min 80° C 70 ° C 95 〇 C 187 〇 C / lilt / with heater 86% Comparative Example 4 Shape transfer layer: Resin (b) 1.1 80 ° C 161 ° C 2 species (0.1 mm) m / min 70 ° C / 107°C 70% Two-layer main layer: Resin (b) 95〇C / no heater (1-9 mm) Thus, according to the method for producing a resin sheet according to the embodiment of the present invention, the shape of the resin sheet can be improved. Imprint rate Although the present invention is specifically described, the present invention is not limited to the above embodiment. In the above embodiment, the continuous resin sheet as a multilayer structure is formed with a shape transfer layer on both sides in the thickness direction (A). And the composition of the main layer (B) sandwiched between the shape transfer layers (A), but the surface of one of the sheets on which the transfer mold is transferred may be formed of the resin (a) as the surface layer (A) The surface of the other sheet may be composed of another resin different from the resin (a). For example, the surface of the other sheet may be composed of a resin, and a continuous resin sheet having a two-layer structure can be produced. Further, in the above embodiment, the light guide plate or the light diffusing plate has been described as the resin sheet, but other resin sheets may be produced. The method for producing a resin sheet of the present invention is effective for the production of a shape light guide plate and a shape diffusion plate of a backlight mounted on a liquid crystal substrate. The present invention is particularly effective for the manufacture of a shape light guide plate and a shape diffusion plate having a high aspect ratio. Further, in the above embodiment, the resin sheet manufacturing apparatuses 50, 50B, 50C, 50D, 50E, and 5F shown in Figs. 5 to 2 and 2B are continuously subjected to 157219.doc •39·201213102 resin sheet. It is also possible to use a resin sheet manufacturing apparatus capable of performing other manufacturing steps. Further, it is preferable that the surface temperature of the continuous resin sheet which has just been peeled off from the shape roll is (Tg(a) - 10) ° with respect to the glass transition temperature Tg (a) of the resin (4) constituting the shape transfer layer (A). C or more (Tg(a) + 30) °C or less, but other temperature ranges. Further, the glass transition temperature Tg(b) with respect to the resin (8) constituting the main layer (B) 'the surface temperature of the continuous resin sheet which has just been peeled off from the shape roll may be Tg(b) ° C to Tg (a) ° C The scope. According to the method for producing a resin sheet of the above embodiment of the present invention, the transfer rate of the shape transferred to the resin sheet can be improved. [Brief Description of the Drawings] Fig. 1 is a schematic configuration view showing a resin sheet manufacturing apparatus according to an embodiment of the present invention. Fig. 2 is a schematic block diagram showing a resin sheet manufacturing apparatus according to a second embodiment of the present invention. Fig. 3 is a schematic block diagram showing a resin sheet manufacturing apparatus according to a third embodiment of the present invention. Fig. 4 is a schematic block diagram showing a resin sheet manufacturing apparatus according to a fourth embodiment of the present invention. Fig. 5 is a schematic block diagram showing a resin sheet manufacturing apparatus according to a fifth embodiment of the present invention. Fig. 6 is a cross-sectional view schematically showing the layer constitution of the resin sheet of the embodiment of the present invention. 157219.doc 201213102 Fig. 7 is a perspective view schematically showing the constitution of a resin sheet according to an embodiment of the present invention. Fig. 8 is a cross-sectional view schematically showing a concave portion formed in a transfer mold and a convex portion formed on a resin sheet. Fig. 9 is a flow chart showing the procedure of a method for producing a resin sheet according to an embodiment of the present invention. Fig. 10 is a cross-sectional view schematically showing a layer configuration of a resin sheet according to another embodiment of the present invention. Fig. 11 is a cross-sectional view schematically showing the configuration of an embodiment of a transmissive image display device including the light guide plate of the present invention. Fig. 12 is a rear view schematically showing a configuration of an embodiment of a surface light source device including a light guide plate of the present invention. Fig. 13 is a rear elevational view showing the configuration of another embodiment of the surface light source device including the light guide plate of the present invention. Fig. 14 is a front view schematically showing a configuration of an embodiment of a surface light source device including a light guide plate of the present invention. Fig. 15 is a perspective view schematically showing the configuration of another embodiment of the light guiding plate of the present invention. Fig. 16 is a side view schematically showing a configuration of an embodiment of a transmissive image display device including the light diffusing plate of the present invention. Figure 17 is a schematic perspective view of the transmissive image display device shown in Figure 16. Fig. 18 is a schematic perspective view of a light diffusing plate comprising a resin sheet according to an embodiment of the present invention. 1572l9.doc •41 · 201213102 Fig. 19 is an enlarged cross-sectional view showing the main part of the light box showing the state in which the light diffusing plate is mounted. Fig. 20 is a schematic block diagram showing a resin sheet manufacturing apparatus according to a sixth embodiment of the present invention. Fig. 21 is an enlarged cross-sectional view showing the main part of a gravure transfer mold attached to a second pressing roll (shape roll). Fig. 22 is a view showing a first modification (substantially semicircular shape) of the gravure transfer mold. Fig. 23 is a view showing a second modification (substantially prismatic shape) of the gravure transfer mold. [Description of main component symbols] 157219.doc 1, 1B Transmissive image device 10 Transmissive image display unit 11 Liquid crystal cell 12 Linear polarizing plate 20, 20B Surface light source device 22 LED light source (point light source) 22B Linear light source 23 Rear wall 24 Side wall 25 Light box 26 Open surface 30 Light guide plate 30C Light diffusing plate 31 Surface ioc • 42- 50 > 50B ' 50C '

50D, 50E, 50F 201213102 32 33, 34 35 35a 35b 38 41 42 51

52A

52B

52C

52D

52E

52G, 52H 53 54 55 57

58 58A 58B Rear side convex portion convex portion 35 apex convex portion 35 lower end dot optical film reflection sheet resin sheet manufacturing apparatus mold first pressing roller 52A second pressing roller 52B third pressing roller pre Press roller 4th squeezing roller (rear squeezing roller) Extracting stick group gravure transfer die sheet forming machine feeder hopper (resin input port) Extruder 1st extruder (sub-extruder) 2nd Extruder (main extruder) -43- 157219.doc 201213102 59 60 60a, 60b

61 62 63 70 71 H H'

P

Q

R

T heater continuous resin sheet · sheet surface shape transfer layer (A) main layer (B) back layer semi-elliptical groove ridge semi-elliptical groove 70 depth semi-elliptical convex portion 35 height adjacent to the convex shape The distance between the apex 3 5a, 35a of the portion 35 is adjacent to the center of the linear light source 22B. The distance between the back surface 32 of the light diffusing plate 30C and the center of the linear light source 22B is 157219.doc • 44-

Claims (1)

201213102 VII. Patent Application Range: 1. A method for producing a resin sheet, comprising: a sheet manufacturing step of continuously extruding a resin in a heated molten state from a mold to produce a continuous resin sheet; and a transfer step a transfer roll formed on a surface of a sheet of the continuous resin sheet, wherein the transfer step comprises: a transfer start step using a squeeze roll The continuous resin sheet produced by the sheet manufacturing step is sandwiched and pressed with the shape roll, thereby starting to transfer the shape of the transfer mold of the shape roll to the continuous resin sheet; The continuous resin sheet in which the shape of the transfer mold is transferred onto the surface of the sheet in the transfer start step is kept in close contact with the peripheral surface of the shape 辍i, and the peeling step is performed. The continuous resin sheet conveyed in the transport step is peeled off from the circumferential surface of the shape roll; and the continuous resin sheet produced by the sheet manufacturing step is a sheet. a multilayer structure having a plurality of layers in the thickness direction of the material, and the shape transfer layer (A) constituting the surface of the sheet disposed on the shape roll side in the transfer start step and adjacent to the shape transfer layer At least two layers of the main layer (B) on the back side; the ratio of the MFR of the shape transfer layer A to the MFR of the main layer b is 1.5 or more, wherein the MFR is based on JIS K7210 and the temperature is 200°. C. The measured value measured at a load of 49 N. 2. The method of manufacturing a resin sheet according to claim 1, wherein the transferring step comprises: a pre-pressing step of: sandwiching the sheet by the pre-pressing roller and the pressing roller The continuous resin sheet produced by the extrusion is subjected to extrusion; and a preliminary transfer step of maintaining the continuous resin sheet extruded in the pre-pressing step in close contact with the circumferential surface of the squeeze roll for transport; In the transfer start step, the continuous resin sheet conveyed by the preliminary transfer step is sandwiched between the pressing rolls and the shape roll. 3. The method for producing a resin sheet according to claim 1 or 2, wherein, in the case where the glass transition temperature of the resin (a) constituting the shape transfer layer (A) is Tg (a), The surface temperature of the shape transfer layer (A) which is in contact with the circumferential surface of the shape roll is in the range of (Tg (a) + 50) ° C ~ (Tg (a) + 150) ° C, just from the above-mentioned shape roll The surface temperature of the shape transfer layer (A) which is peeled off by the circumferential surface is in the range of (Tg (a) - 10) ° C to (Tg (4) + 40) ° C. 4. The method for producing a resin sheet according to any one of claims 1 to 3, wherein a ratio of a thickness of the shape transfer layer (A) to a thickness of the main layer (B) is 1/200 to 1/1 The scope of 10. 5. The method of producing a resin sheet according to any one of claims 1 to 4, which comprises a heating step of 157219.doc • 2·201213102, which is preceded by the heating and the above extrusion immediately before the above-described transfer start step The surface of the shape transfer layer (A) of the continuous resin sheet which is conveyed by the circumferential surface of the pressure roller is closely adhered. 6. The method of producing a resin sheet according to any one of claims 1 to 5, wherein the transfer mold is provided in the direction of the rotation axis of the shape roller and is provided in a plurality of consecutive directions in the circumferential direction of the shape roller The groove portion; the arrangement interval p of the plurality of groove portions is 2〇〇μπι~500 μηι. 7. The method of producing a resin sheet according to any one of claims 1 to 6, wherein the transfer mold is provided in the direction of the rotation axis of the shape roller and is provided in a plurality of consecutive directions in the circumferential direction of the shape roller. The groove portion; a plurality of the groove portions are arranged at equal intervals. 8. The method of producing a resin sheet according to any one of claims 1 to 7, wherein the transfer mold is provided in the direction of the rotation axis of the shape roller and is provided in a plurality of consecutive directions in the circumferential direction of the shape roller. The groove portion; the depth of the plurality of groove portions is only 1〇〇μηι 5〇〇μιη. 9. The method of producing a resin sheet according to any one of claims 1 to 8, wherein the transfer mold is provided with a plurality of circumferential directions of the shape roller in a direction of a rotation axis of the shape roller. The continuous groove portion; the ratio of the depth Η of the plurality of groove portions to the arrangement interval Ρ of the groove portions, that is, the aspect ratio Η/P is 〇.3 or more. The method of producing a resin sheet according to any one of claims 1 to 9, wherein the transfer mold is provided in the direction of a rotation axis of the shape roller and is provided in a plurality of consecutive directions in the circumferential direction of the shape roller. The groove portion 157219.doc 201213102 having a shape in which the groove is perpendicular to the circumferential direction of the shape roll is substantially semicircular, substantially semi-elliptical or prismatic. The method of producing a resin sheet according to any one of claims 1 to 10, wherein, in the transfer mold, a plurality of the circumferential direction of the shape roller are provided in a direction of a rotation axis of the shape roller a continuous groove portion; a cross-sectional shape of the groove portion in a direction orthogonal to a circumferential direction of the shape roll is adapted to form an optical lens. 12. The method for producing a sheet according to any one of claims 1 to 11, wherein the shape of the shape transfer layer (4) is a styrene resin or an acrylic resin; The resin (b) constituting the main layer (B) of the propylene is a benzoic acid resin. 157219.doc