专利摘要:
(Problem) Supplying the sheet | seat for transmissive screens in which the groove shape differs regularly in a stepless direction at low cost stably. (Solution means) A sheet for a transmissive screen having a thickness of 0.1 to 2.0 mm in which a large number of lens shapes are shaped into corrugations on the surface, the sheet having (i) a melting point in the range of 10 2 to 10 3 Pa · s The inclination (W) derived from the relationship between Fig. (Y) and the load (X) is formed of a thermoplastic resin satisfying the following formula (1), and (ii) the height of the lens is perpendicular to the corrugation shape at the center or near the center. Transmissive screen sheet, characterized in that it changes substantially steplessly to the periphery. 2 × 10 -2 ≤W≤6 × 10 -2 (1) In formula, W is represented by the following formula. W =-(logY / X) X is a load (MPa) and Y is a melt viscosity (Pa * s) of resin here.
公开号:KR20040032777A
申请号:KR1020030070098
申请日:2003-10-09
公开日:2004-04-17
发明作者:진노마사나오;미야우찌마사요시;혼다마꼬또;이데미찌히사
申请人:데이진 가세이 가부시키가이샤;다이니폰 인사츠 가부시키가이샤;
IPC主号:
专利说明:

Sheet for transmissive screen and transmissive screen using same {TRANSMISSION SCREEN SHEET AND TRANSMISSION SCREEN COMPRISING THE SAME}
[14] The present invention relates to a transmissive projection screen and a sheet therefor.
[15] Background Art Various projections have been studied in the conventional projection screen as a means for improving light diffusion. For example, as a light diffusing agent, it is mainstream to mix | blend inorganic fine particles and organic polymer fine particles in a resin sheet, or to give a special shaping | molding, such as a lens shape, to a sheet surface in order to give a fixed diffusive characteristic.
[16] For the provision of the lens shape, a sheet-like method in which an electron beam curable resin is placed in a mold opposite to the lens shape and laminated with a plate-shaped molded product, or a thermoplastic resin in a molten state is sculpted in the width direction and the opposite shape to the lens shape The continuous extrusion method (The Unexamined-Japanese-Patent No. 9-11328) etc. which carry out the shaping | molding by a roll are mentioned.
[17] In addition, since projection screens are required to have higher image quality in recent years, a method of changing the diffusibility by continuously increasing the ends while the lens shape has a shallow central portion (JP-A-7-134338, JP-A-11-237692). Japanese Unexamined Patent Application Publication No. 2000-98499, US Patent No. 6,292, 294) and thinning of screens are under development for the purpose of reducing the double phase and cost by the reflection of the screen itself.
[18] An object of the present invention is to manufacture a sheet for a transmissive screen used for a light diffusion sheet for a transmissive projection screen at a high quality and at a low cost.
[19] The present inventors have found that in order to achieve the above-mentioned quality improvement and cost reduction of the transmissive screen sheet at the same time, it is most useful to produce by the continuous extrusion method and by reducing the thickness of the light diffusion sheet, but the continuous extrusion using the shaping roll In the method, it was found that the melt bank was sandwiched between two rolls while forming the melt bank, so that the formation of the melt bank was uneven along the extrusion width, so that the shaping could not be made uniform.
[20] That is, the larger the shape of the bank, the larger the resin to be inserted and the higher the reduction force, so that the buoyancy is increased. On the contrary, the smaller the bank shape, the smaller the resin to be inserted and the lower the reduction force, the lower the formation. In addition, since the size of the melt bank is always slightly changed when the extrusion molding method is employed, it is difficult to stably produce a continuous lens shape in the present method using a roll having a fine concavo-convex shape.
[21] On the other hand, comparing the rolls of the grooves having different unevenness along the width direction and the rolls of the grooves having uneven unevenness along the width direction, the lens shape is different from the rolls that have uneven unevenness along the width direction. It was very difficult to stably produce continuously.
[22] In addition, when the thickness of the sheet for thinning becomes easy to cool and solidify in a curved state, it is necessary to heat-treat the deformation of the resin sheet with a heater or the like in the process of removing the resin sheet from the shaping roll and making it smooth. At this stage, there was a problem that a small crack was generated during molding from the groove of the lens as a starting point.
[23] As a result of earnestly examining to solve these problems, even when the roll which changes the shape of an engraving groove steplessly is used by using resin whose pressure dependence in the molten state of a thermoplastic resin is a certain range, it is related to the state of a melt bank. It has been found that the shaping of the desired lens shape can be obtained stably without the present invention.
[1] BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows an example of the manufacturing apparatus of the transmissive screen sheet in this invention.
[2] FIG. 2 shows an example of an enlarged view of the engraving groove roll in FIG. 1.
[3] 3 shows an example of a cross-sectional view of a sheet for transmissive screen according to the present invention.
[4] 4 shows an example of another cross-sectional view of the sheet for transmissive screen according to the present invention.
[5] Fig. 5 shows an example of another cross-sectional view of the sheet for transmissive screen according to the present invention.
[6] (Description of Major Symbols in the Drawing)
[7] 1: carved groove roll
[8] 2: mirror cooling roll
[9] 3: mirror cooling roll
[10] 4: Melt Bank
[11] 5: melt-extruded sheet-like thermoplastic resin
[12] 6: T die lip
[13] 7: takeover roll
[24] That is, according to the present invention, a sheet for a transmissive screen having a thickness of 0.1 to 2.0 mm in which a large number of lens shapes are formed in a corrugated shape on the surface thereof, which sheet (i) has a melt viscosity in the range of 10 2 to 10 3 Pa · s. The slope (W) derived from the relationship between the melt viscosity (Y) and the load (X) is formed of a thermoplastic resin satisfying the following formula (1), and (ii) the height of the lens is toward the periphery from the center or near the center. Provided is a sheet for transmissive screen, characterized in that it changes substantially steplessly in a direction perpendicular to the corrugation shape.
[25] 2 × 10 -2 ≤W≤6 × 10 -2 (1)
[26] In formula, W is represented by the following formula.
[27] W =-(logY / X)
[28] X is a load (MPa) and Y is a melt viscosity (Pa * s) of resin here.
[29] Hereinafter, the sheet for a transmissive screen of the present invention and a manufacturing method thereof will be described in more detail.
[30] First, the present invention will be described with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows an example of the manufacturing apparatus of the transmissive screen sheet of this invention. 1, 2, and 3 in FIG. 1 are cooling rolls, among which at least one of the cooling rolls 1 or 2, or both surfaces is formed with a plurality of finely shaped grooves as shown in FIG. The cooling roll 3 is a normal mirror roll. 4 is a melt bank, 5 is melt-extruded sheet-like resin, 6 is T die lip, 7 is a take-out roll. 2 is an enlarged view of the engraving groove roll in FIG. 1, and FIG. 3 is an example of a cross-sectional view of the sheet for transmissive screen of the present invention. The height change of the lens shape of the sheet surface in FIG. 3 corresponds approximately to the shape of the engraving groove roll in FIG. 2. As for the lens shape of the sheet surface of FIG. 3, the position of the valley part of each lens maintains the same level in the thickness direction of a sheet toward the peripheral part from the center part or center part vicinity, and the position of the vertex part of the mountain of each lens is changing high. On the other hand, the sheet surface lens shape of Fig. 4 (an enlarged view of the engraving groove roll corresponding to this Fig. 4 is not shown), and the position of the apex of each lens mount toward the periphery from the center portion or near the center portion is in the thickness direction of the sheet. Maintaining approximately the same level, the position of the valley of each lens is changed low, and as a result, the height of each lens is changing high toward the periphery. On the other hand, the surface opposite the surface having the lens shape of the transmissive screen sheet of the present invention is a flat surface.
[31] Referring to the specific manufacturing method of the sheet for a transmissive screen, the thermoplastic resin is melted in the extruder and extruded into a sheet shape through the T die lip (6), the sheet extruded in the molten state is roll (1, 2) and roll ( 3) It is cooled while being pressed in between. At this time, after the fine lens shape is imparted and cooled by the engraving grooves formed on the surface of the roll 1 or 2, the sheet is taken out by the take-up roll 7. The roll diameters of the rolls 1, 2 and 3 used herein do not need to be particularly limited and do not need to be unified to the same roll diameter, but the roll diameter is usually 200 mm or more, in particular the same as that of 250 to 500 mm. Diameter ones are preferably used.
[32] The pitch of the engraving groove of the engraving groove roll to be used is 40 to 150 µm, more preferably 50 to 100 µm. If the thickness is smaller than 40 µm, the melt viscosity at the time of molding the thermoplastic resin is high, so that the resin does not sufficiently enter the roll grooves under pressure, so that the lens-shaped shaping is difficult. On the other hand, if the thickness exceeds 150 µm, the thermoplastic resin easily enters the grooves, but is more susceptible to side effects due to the difference in the shape of the melt bank, and the lens shape becomes unstable, thus making it difficult to obtain stable quality as a substrate for transmission screens. .
[33] The groove depth of the engraving groove roll used in the present invention is 3 to 150 m, preferably 5 to 100 m. If the thickness is less than 3 µm, since the fragments on the roll become substantially nonuniform, the desired quality is difficult to be obtained. On the contrary, even if the thickness is larger than 150 µm, the moldability does not change since the resin has a high melt viscosity. The groove depth of the roll is also designed in consideration of the transfer rate to the sheet.
[34] The pitch of the lens shape in the sheet for transmissive screen of this invention depends on the pitch of the engraving groove of a roll. The pitch of the lens shape is preferably 40 to 150 mu m, more preferably 50 to 100 mu m. Moreover, it is preferable that all the lens shapes have the same pitch. That is, it is preferable that the sheet is provided with many lens shapes with the same pitch.
[35] The height of the lens shape is changed by the depth and pitch of the engraving grooves of the roll and the installation position of the engraving rolls, and it is not necessary to emboss the lens shape on the entire surface, for example, the center portion is 1 to the product width of the sheet. Lens shape over the range of / 3 to 1/1000, preferably in the range of 1/5 to 1/1000, more preferably in the range of 1/10 to 1/1000 (this range is called "near center"). There is no lens, and a lens shape may be provided at the periphery thereof, but the range of the height may vary depending on the size of the screen, but in general, 1 to 50 µm is preferable, and 1 to 30 µm is more preferable.
[36] The relationship between the depth of the engraving grooves of the roll and the lens height is expressed by the transfer rate (lens height / depth of the grooves). The transfer rate is changed by the thickness of the sheet, the molding temperature, the molding pressure, and the like. The thinner the sheet, the higher the molding temperature, and the higher the molding pressure, the higher the transfer rate. The transcription rate is usually 20 to 90%.
[37] In addition, it is preferable that the height of the lens varies from steplessly to 0.01 to 0.5 µm / cm with an average of displacement of the lens height from the central portion or the vicinity of the central portion to the peripheral portion.
[38] Here, the displacement is the value which selected the measuring area of width 8mm at the interval of 5 cm, measured the average height of each measuring area, and showed the displacement of the average height of each area by 1 cm unit.
[39] Further, the lens height displacement is more preferably changed steplessly to 0.01 to 0.5 µm / cm even when the 5 cm gap is gradually narrowed (specifically, 3 cm gap and 1 cm gap), ideally. It is preferable that the height displacement of each lens be changed steplessly while satisfying 0.01 to 0.5 µm / cm.
[40] Here, "changing steplessly" means that the change in lens height is not a step change, but gradually changes continuously as a whole as described above. That is, stepwise changes such as a large number of groups of lenses of the same height are arranged regularly are undesirable. Such a step change causes the light and dark lines on the screen to be generated when the sheet is used as the screen.
[41] As the lens shape, a lenticular type in which the lens is curved, a prism type in which the lens is an isosceles triangle, or a linear Fresnel type in which the cross-sectional shape of the Fresnel lens are arranged in one direction is preferable. For the purpose of uniformly diffusing light, a shape in which both lenticular or lenticular and linear Fresnel shapes are imparted is particularly preferable.
[42] The case where the lens shape of the sheet of this invention is a lenticular lens is demonstrated more concretely. The structure of this lenticular sheet is described, for example in Unexamined-Japanese-Patent No. 11-237692 and US 6,292,294. That is, when the lens shape is a lenticular lens, the lens height is changed so that the lens height of the peripheral portion becomes higher than the center portion (including the central portion vicinity). By changing the lens height in this manner, the diffusion characteristics are continuously changed. The diffusion angle of the peripheral portion is made larger than the diffusion angle of the central portion. In order to increase the diffusion angle of the peripheral portion with respect to the diffusion angle of the central portion, the lens height of the peripheral portion can be achieved by changing the curvature and the appearance shape of the unit lens higher than the lens height of the central portion with a single pitch. Another method of changing the diffusion angle is a method of increasing the utilization rate of the shape by sequentially increasing the pitch of lenses having the same curvature, but the pitch of the lenticular lens is preferably single.
[43] Next, the shape of the said lenticular lens is demonstrated by drawing.
[44] When the lens shape of the sheet of this invention is a lenticular lens, an example of sectional drawing of a sheet | seat is shown to FIG. 3 and FIG. In the cross-sectional view of FIG. 3, the positions of the valleys of the respective lenses are maintained at substantially the same level in parallel in the thickness direction of the sheet from the central portion to both peripheral portions, and the positions of the respective lens heights (mountain peaks) are changing high. . On the other hand, the cross-sectional view of Fig. 4 shows that the position of each lens height (mountain peak) from the center portion to both peripheral portions maintains substantially the same level in parallel in the thickness direction of the sheet, and the valley portion of each lens changes low. Doing. In addition, another sectional drawing of the sheet | seat of a lenticular lens is shown typically in FIG. 5 shows that the shape and height of the lens change toward both peripheral portions rather than the central portion.
[45] Moreover, in manufacture of a sheet, it is preferable to adjust the shape of a melt bank to 1/100 or less of the roll diameter generally clamped. If the bank shape is uniform in the width direction, the bank size is not particularly limited as long as the appearance of the molded sheet is not defective, but if the bank shape is too large, air may be curled to generate a bubble trace in the sheet. On the contrary, when the shape of the bank is too small, the appearance defect of the thickness deviation pattern due to the lack of the reduction in the press-down is likely to occur. As a method of adjusting the melt bank width, for example, an automatic measurement control method for installing a bank sensor by a radiation thermometer, a video camera method visually captured, an optical fiber method, a method of adjusting the temperature of a die or the lip spacing of a die by the naked eye, etc. Can be mentioned.
[46] The thickness of the transmissive screen sheet thus obtained is 0.1 to 2.0 mm. The thickness can be determined by adjusting the gap between the roll 1 and the roll 2, but if the thickness is thinner than 0.1 mm, the roll 1 and the roll are The gap of (2) becomes too small and there exists a possibility that roll may contact. If it is thicker than 2.0 mm, the problem of double phase due to internal reflection tends to occur, and the light transmittance is lowered, leading to an increase in cost, such as lowering of luminance, which is not preferable. When the thermoplastic resin is a polycarbonate resin, the sheet thickness is more preferably 0.2 to 1.5 mm, particularly preferably 0.3 to 1.0 mm.
[47] The thermoplastic resin forming the sheet for transmissive screen of the present invention has a gradient derived from the relationship between the melt viscosity (Y ㎩ · s) and the load (X MPa) in the range of 10 2 to 10 3 Pa.s. W) is a resin that satisfies 2 × 10 −2 ≦ W ≦ 6 × 10 −2 , preferably 2.5 × 10 −2 ≦ W ≦ 5.5 × 10 −2 . Here, the slope W is represented by [-(logY / X)].
[48] Polycarbonate resin etc. are mentioned as a thermoplastic resin which satisfy | fills the said inclination (W). The polycarbonate resin is obtained by reacting a dihydric phenol and a carbonate precursor by solution polymerization or melt polymerization. It is preferable to mainly use 2, 2-bis (4-hydroxyphenyl) propane (common name bisphenol A) as a dihydric phenol used here, You may replace one part or all with another dihydric phenol. As another dihydric phenol, for example, 1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 2,2-bis (4-hydroxy-3, 5-dimethylphenyl) propane, 2, 2-bis (4-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfone, etc. are mentioned. More preferable polycarbonate resin is resin in which 50 mol% or more, especially 70 mol% or more of all dihydric phenols consist of bisphenol A. Examples of the carbonate precursors include phosgene, diphenyl carbonate, bischloroformate of the dihydric phenols, di-p-tolyl carbonate, phenyl-p-tolyl carbonate, di-p-chlorophenyl carbonate, and dinaphthyl carbonate. Among them, phosgene and diphenyl carbonate are particularly preferred.
[49] The basic means of these manufacturing methods is demonstrated easily. In the reaction using a phosgene, for example, as a carbonate precursor (solution polymerization method), the reaction is usually carried out in the presence of an acid binder and a solvent. As the acid binder, for example, an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide or an amine compound such as pyridine is used. As the solvent, for example, halogenated hydrocarbons such as methylene chloride and chlorobenzene are used. In addition, for example, a catalyst such as a tertiary amine or quaternary ammonium salt may be used for promoting the reaction. At this time, the reaction temperature is usually 0 to 40 ° C, and the reaction time is several minutes to 5 hours.
[50] A transesterification reaction using a diester carbonate as a carbonate precursor (melt polymerization method) is carried out while stirring a predetermined ratio of a dihydric phenol component with a diester carbonate under an inert gas atmosphere, thereby distilling the resulting alcohol or phenols. It is executed by the method of putting out. The reaction temperature varies depending on the boiling point of alcohols or phenols to be produced, but is usually in the range of 120 to 350 ° C. The reaction completes the reaction while distilling the alcohol or phenols produced under reduced pressure from the beginning. Moreover, in order to accelerate | stimulate reaction, the catalyst normally used for transesterification reaction can also be used. Examples of the diester carbonate used in the transesterification reaction include diphenyl carbonate, dinaphthyl carbonate, bis (diphenyl) carbonate, dimethyl carbonate, diethyl carbonate, dibutyl carbonate and the like. Of these, diphenyl carbonate is particularly preferable.
[51] The degree of polymerization of the polycarbonate resin is not particularly limited as long as the slope (W) satisfies 2 × 10 −2 ≦ W ≦ 6 × 10 −2 . When producing such a polycarbonate resin, if necessary, a suitable molecular weight regulator, a branching agent for improving workability, a catalyst for promoting the reaction, a stabilizer such as phosphite ester, phosphate ester, phosphonic acid ester, tetrabrombisphenol A, tetra Flame retardants, such as a low molecular weight polycarbonate and decabromo diphenyl ether of bromine bisphenol A, a coloring agent, a lubricant, etc. can be added.
[52] The polycarbonate resin preferably has a specific viscosity of 0.25 to 0.7, more preferably 0.7 to 0.6, and more preferably 0.7 to 0.6 g of the resin in 100 ml of methylene chloride.
[53] It is preferable that the sheet for transmissive screens of this invention is formed from the thermoplastic resin composition (especially polycarbonate resin composition) which mix | blended the resin granule as a diffusing agent.
[54] It is preferable that an average particle diameter is 1-50 micrometers, and, as for the resin granules as a diffusing agent to be used, 3-30 micrometers is more preferable. If the average particle diameter is less than 1 µm, the diffusion properties of the diffusing agent are lowered. If the average particle diameter is larger than 50 µm, the particle size is too large, so that irregularities are formed on the surface, resulting in product defects or sparkling. The refractive index of the resin granules is not particularly limited because it depends on the optical requirements of the transmissive screen, but in general, the range of 1.42 to 1.60 is appropriate, the range of 1.45 to 1.60 is preferable, and the range of 1.50 to 1.60 is more preferred. desirable.
[55] Specific examples of the resin granules include, for example, partially crosslinked polymethacrylate resin or polystyrene resin, and polymer fine particles based on partially crosslinked methyl methacrylate as a preferred embodiment [manufactured by Sekisui Chemical Co., Ltd.]. : MBX-5, MBX-20], Polymer-based fine particles based on partially crosslinked styrene [Sekisui Chemicals, Inc .: SBX-8], Polymer based on copolymer of partially crosslinked styrene and acrylic Fine particles [Kantz Chemicals Industry Co., Ltd. make: GSM-8], [Sekisui Chemicals Industry Co., Ltd. make: SM10X-12JH, MS10X-12D], poly / butyl acrylate core / poly (methyl methacryl) And a polymer having a core / shell monopoly paper containing a shell of RATE) (manufactured by Rohm and Haas Company: Pararoid EXL-5136). The addition amount of the resin granules varies depending on the thickness of the transmissive screen sheet and the difference in refractive index between the thermoplastic resin and the resin granules, but is preferably 0.01 to 2.0 parts by weight based on 100 parts by weight of the thermoplastic resin. When the amount is more than 2.0 parts by weight, the diffusivity is so strong that it cannot function as a transmissive screen sheet.
[56] The transmissive screen sheet in the present invention can be subjected to an antistatic treatment for the purpose of preventing dust adhesion. Examples of the antistatic treatment include a method in which the antistatic agent is added to the resin, and a method of applying the antistatic agent while spraying the sheet in the form of a roll or a mist and the like.
[57] In the present invention, the transmissive screen sheet is formed by placing radiation curable resin in a mold having an inverted shape such as a Fresnel lens layer, and laminating with the rear side of the surface having the lens shape of the transmissive screen sheet. It is preferably used for projection TV and the like as a Fresnel lens sheet for a transmissive screen which is cured and laminated by irradiating such radiation.
[58] Further, in the present invention, the transmissive screen sheet includes (1) a transmissive screen sheet in which the lens shape is shaped into a corrugated shape, and (2) a transmissive screen sheet in which the lens shape is shaped into a corrugated shape. (1) and / or (2) in the laminated transmissive screen in which the corrugated directions are orthogonal to each other with respect to the sheet of 1) and (3) the Fresnel lens layers are arranged in any order. It is also preferably used as a sheet for a transmissive screen. This arrangement is preferably in the order of (1), (2) and (3) or the order of (1), (3) and (2) from the observer's side.
[59] Example
[60] The present invention will be described in more detail with reference to the following Examples.
[61] In addition, the slope (W) is a float tester (Shimadzu Corporation: CFT-500C) with a nozzle diameter of 1.0 mm, a length of 10 mm, a load of 4.9 to 29.4 MPa (4.9 MPa, 9.8 MPa, 19.6 MPa, 29.4 MPa), and a temperature of 280. The flow value (cm 3 / S) of the resin at 0 ° C. was measured five times with each load (MPa), and the melt viscosity (V · s) was obtained from each average value, and the load (MPa) was determined by the horizontal axis and the melt viscosity (㎩ • The slope (W) was calculated by drawing a graph with the logarithm of s) as the vertical axis.
[62] The lens shape of the transmissive screen sheet was a stylus surface roughness gauge manufactured by Tosoku Precision Co., Ltd. (Safcom SE-1100), and the cut-off value was 0.8 mm and the measurement length was 8 mm in the width direction (wrinkle direction). Measured at right angles). The transferability was measured five points at intervals of 5 cm in the extrusion direction with the surface roughness meter at the center portion in the width (1,000 mm) direction of the sheet, and the height of each lens and its variation rate were determined. The height of the lens is measured by the ten-point average roughness Rz (difference between the average of the highest to fifth elevations measured from the baseline and the average of the elevations of the lowest to fifth valleys). It was. The rate of change was calculated by the following equation.
[63] % Change = [(max-min) / {(max + min) ÷ 2}] × 100
[64] (Circle) and the case where 5-10% of cases where the variation rate of each section height is less than 5% were represented by (x).
[65] The external appearance of the screen is placed in a fresnel-processed mold, superimposed on the surface where the transmissive screen sheet is not shaped, and cured in a laminated state to form a transmissive screen, which is actually mounted on a 50-inch projection television. When the image at the time of visual evaluation is visually evaluated and the screen brightness is high and the double image cannot be confirmed, ○ When the brightness of the center and the end is not uniform and the end is dark, or the double image is confirmed within the screen. It was set as x.
[66] Examples 1-7
[67] The sheet for transmissive screens of 0.2-1.0 mm thickness was manufactured with the extruder provided with the apparatus shown in FIG.
[68] T-die lip with a width of 1,200 mm and two mirror cooling rolls with a diameter of 360 mm and a engraving groove roll with a diameter of 360 mm (with the smallest groove depth at the center and cut to increase the depth of the groove every pitch toward the end) Polycarbonate resin obtained by reaction of bisphenol A and phosgene having melting characteristics of gradient (W) shown in Table 1 (Example 1: Specific viscosity 0.450, Examples 2, 4 to 7 and Comparative Example 3; Specific Viscosity 0.425, Example 3: Specific viscosity 0.365), the organic fine particles shown in Table 2 were added in the amount shown in Table 1, and extruded into a sheet shape at a cylinder temperature of 280 ° C and the discharge amount from the T die lip 300 kg / hr It sandwiched between a flake groove roll and a mirror cooling roll, shape | molded by the melt bank system, was taken out by the take-up roll, and the sheet for transmissive screens of Table 1 was obtained. The temperature of the mirror cooling rolls 2 and 3 set 120 degreeC, 140 degreeC, and the temperature of the engraving groove | roll roll respectively to 110 degreeC, and the evaluation result was shown in Table 1. All obtained transmissive screens were free from dimensional deformation and warping due to moisture absorption, and a good image without double phase was obtained.
[69] Further, the sheet (width 1,000 mm) obtained in Example 5 was 5 cm under the conditions of a cutoff value of 0.8 mm and a measurement length of 8 mm using the stylus type surface roughness meter described above in the width direction (perpendicular to the wrinkle shape). Lens heights were obtained at intervals. The results are shown in Table 3. In addition, the height of the lens is the difference between the ten-point average roughness Rz (the difference between the average value of the normal elevation from the highest to the fifth to the fifth level measured from the baseline and the average value of the elevation of the valley from the deepest to the fifth). Was measured. The results are shown in Table 3.
[70] Comparative Example 1
[71] For the transmission screen described in Table 1 under substantially the same conditions as in Example 2, except that a resin of methacrylic styrene copolymer (Shin-Nitetsu Chemical Co., Ltd .: Ethylene MS-800) having a slope (W) of 0.235 instead of polycarbonate resin was used. The sheet was obtained and the evaluation results are shown in Table 1. As is clear from the table, the higher the W, the greater the dependence of the resin pressure, which greatly influences the fluctuation of the melt bank during shaping.
[72] Comparative Example 2
[73] For the transmission screen described in Table 1 under substantially the same conditions as in Example 5, except that a resin of methacrylic styrene copolymer (Shinnitetsu Chemical Co., Ltd .: Ethylene MS-800) having a slope (W) of 0.235 instead of the polycarbonate resin was used. The sheet was obtained and the evaluation results are shown in Table 1.
[74] Comparative Example 3
[75] Except having made thickness into 3.0 mm, the sheet for transmissive screens was obtained from the polycarbonate resin which has the same inclination W as Example 2, and the evaluation result was shown in Table 1. Since the thickness of the resin was increased, the double phase was confirmed in the evaluation on the screen, and the overall contrast was low, resulting in a faint image.
[76]
[77] DiffuserProduct NamemakerRefractive indexAverage particle size (㎛) Diffusion Agent ASM10X-12JHSekisui Chemicals Industry1.56612 Diffusion Agent BMS10X-12DSekisui Chemicals Industry1.53012 Diffusion Agent CG-SM8Kantsu Hwaseong Fortress1.5668
[78]
[79] According to the present invention, when the groove shape is regular and steplessly produced by the melt bank method using different rolls in the width direction, by using a thermoplastic resin whose pressure dependency of molding temperature conditions is substantially within a specific range, The sheet for transmissive screen having a shape can be easily and stably supplied at low cost.
权利要求:
Claims (14)
[1" claim-type="Currently amended] A sheet for transmissive screens having a thickness of 0.1 to 2.0 mm in which a large number of lens shapes are shaped into corrugations on the surface, the sheet comprising (i) a melt viscosity (Y) in the range of 10 2 to 10 3 Pa · s The inclination (W) derived from the relationship between and the load (X) is formed of a thermoplastic resin that satisfies the following formula (1), and (ii) the height of the lens is perpendicular to the corrugation shape from the central portion or the vicinity of the central portion toward the peripheral portion. Transmissive screen sheet, characterized in that it changes substantially stepless.
2 × 10 -2 ≤W≤6 × 10 -2 (1)
In formula, W is represented by the following formula.
W =-(logY / X)
X is a load (MPa) and Y is a melt viscosity (Pa * s) of resin here.
[2" claim-type="Currently amended] The transmissive screen sheet according to claim 1, wherein the lens-shaped pitch is 40 to 150 µm and the lens height is 1 to 30 µm.
[3" claim-type="Currently amended] The transmissive screen sheet according to claim 1, wherein the plurality of lens shapes are all formed at the same pitch.
[4" claim-type="Currently amended] The transmissive screen sheet according to claim 1, wherein the lens shape is lenticular, prismatic, or linear Fresnel.
[5" claim-type="Currently amended] The transmissive screen sheet according to claim 1, wherein the lens shape is lenticular.
[6" claim-type="Currently amended] The transmissive screen sheet according to claim 1, wherein the lens has a lenticular type, a prism type, a linear Fresnel type, or a lenticular type and a linear Fresnel type.
[7" claim-type="Currently amended] The transmissive screen sheet according to claim 1, wherein the thermoplastic resin is a polycarbonate resin.
[8" claim-type="Currently amended] The transmissive screen sheet according to claim 1, wherein the sheet has a lens height shifting steplessly from 0.01 to 0.5 mu m / cm from the center portion or from the center portion to the periphery portion.
[9" claim-type="Currently amended] The transmissive screen sheet according to claim 1, wherein the sheet is formed of a composition containing 0.01 to 2.0 parts by weight of a resin granule having an average particle diameter of 1 to 50 µm with respect to 100 parts by weight of a thermoplastic resin.
[10" claim-type="Currently amended] The transmissive screen sheet according to claim 9, wherein the resin particulate has a refractive index in the range of 1.42 to 1.60.
[11" claim-type="Currently amended] A transmissive screen comprising the sheet according to claim 1 as one of the composite component sheets.
[12" claim-type="Currently amended] The transmissive Fresnel lens sheet which arrange | positioned the Fresnel lens layer on the back surface of the surface which has many lens shapes of the transmissive screen sheet of Claim 1.
[13" claim-type="Currently amended] (1) Sheets for transmissive screens in which a plurality of lens shapes are shaped into corrugations; (2) Sheets for transmissive screens in which a plurality of lens shapes are shaped in corrugations, provided that the sheet is wrinkled with respect to the sheet of (1). (3) Fresnel lens layers are arranged in any order, wherein the sheet for transmissive screens of (1) and / or (2) is in accordance with claim 1 A transmissive screen, which is the sheet for transmissive screen described.
[14" claim-type="Currently amended] The projection television equipped with the sheet | seat or transmissive screen of any one of Claims 11-13 in the display surface.
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同族专利:
公开号 | 公开日
US6798572B2|2004-09-28|
US20040114228A1|2004-06-17|
引用文献:
公开号 | 申请日 | 公开日 | 申请人 | 专利标题
法律状态:
2002-10-09|Priority to JPJP-P-2002-00296087
2002-10-09|Priority to JP2002296087
2003-10-09|Application filed by 데이진 가세이 가부시키가이샤, 다이니폰 인사츠 가부시키가이샤
2004-04-17|Publication of KR20040032777A
优先权:
申请号 | 申请日 | 专利标题
JPJP-P-2002-00296087|2002-10-09|
JP2002296087|2002-10-09|
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