CN1496814A - Thin plate for transmission screen and transmission screen using the thin plate - Google Patents
Thin plate for transmission screen and transmission screen using the thin plate Download PDFInfo
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- CN1496814A CN1496814A CNA2003101203607A CN200310120360A CN1496814A CN 1496814 A CN1496814 A CN 1496814A CN A2003101203607 A CNA2003101203607 A CN A2003101203607A CN 200310120360 A CN200310120360 A CN 200310120360A CN 1496814 A CN1496814 A CN 1496814A
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- thin plate
- projection screen
- rear projection
- lens
- resin
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Images
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- Overhead Projectors And Projection Screens (AREA)
Abstract
A transmission screen sheet which is given a large number of lens-like forms on the surface like ridges and has a thickness of 0.1 to 2.0 mm, wherein (i) the sheet is formed from a thermoplastic resin whose inclination (W) obtained from the relationship between melt viscosity (Y) and load (X) satisfies the following expression (1) when the melt viscosity is in the range of 10<2 >to 10<3 >Pa.s, and (ii) the lens-like forms change in height substantially non-stepwise from the center portion or a portion near the center portion to the end portions of the sheet in a direction perpendicular to the ridges: 2x10<-2><=W<=6X10<-2> (1) wherein W is represented by the following equation: W=-(logY/X) wherein X is a load (MPa) and Y is the melt viscosity (Pa.s) of the resin.
Description
Technical field
The present invention relates to a kind of transmission screen curtain and the thin plate that is used for this projection screen.
Background technology
As the means of on projection screen, carrying out light scattering in the prior art well, use various methods.Main method for example has and will sneak into method in the resin sheet as the inorganic particles of light scattering agent and organic polymer particulate, perhaps makes the thin plate face form special shape such as lens shape and gives the method for its certain scattering properties.
The mode that makes the thin plate face form lens shape comprise electronic radiation solidifying type resin is flowed in the mould with the lens shape negative shape and with the page or leaf chip method of tabular formed body lamination, perhaps utilize be carved with the roller broad ways of lens shape negative shape to the exert pressure continuous extrusion way (the Japanese documentation spy opens flat 9-11328 communique) etc. of moulding of the thermoplastic resin of molten condition.
In the last few years, owing to pursue the high image quality of projection screen always, people's development research always makes lens shape shoal and uprise continuously to the end and change the method for scattering (the Japanese documentation spy opens flat 7-134338 number, spy and opens flat 11-237692 number, spy and open 2000-98499 communique, american documentation literature US6 at central portion, 292, No. 294 instructionss), and to reduce the afterimage that is caused by reflection that screen self was had and to reduce cost is the slimming of purpose.
Summary of the invention
The objective of the invention is to make a kind of high-quality and cheap, use at the transmission screen curtain with the rear projection screen thin plate on the light scattering thin plate.
People of the present invention are in order to realize that simultaneously above-mentioned raising rear projection screen is with the quality of thin plate and the purpose that reduces cost, find that the production model that adopts continuous extrusion way and reduce the light scattering gauge of sheet is the most useful, but be to use the continuously extruded mode of format roll, because the limit forms fused deposition material limit the pair of rolls clamping is exerted pressure, along extruding Width, the formation of this fused deposition material becomes inhomogeneous, evenly moulding.
That is to say that if the shape of described fused deposition material is big, then because the resin that folder is entered increases, the power of depressing becomes big, has increased mouldability; On the contrary, if the shape of described fused deposition material is little, because the resin that folder is entered tails off, the power of depressing diminishes, and has reduced mouldability.And small variations usually takes place in the size of fused deposition material when adopting extrusion process, thereby uses the mode of the roller that processes the micro concavo-convex pattern to be difficult to stably produce continuously lens shape.
On the other hand, roller with the different concaveconvex shape of engraving groove shape broad ways is compared with the roller of the concaveconvex shape with groove shape broad ways uniformity, uses the extremely difficult steady and continuous of the roller with the different concaveconvex shape of broad ways ground to produce lens shape.
In addition, if make screen gauge of sheet attenuation, because screen is with thin plate cooling curing under case of bending easily, peeling resin from format roll makes it to become the flat process, be necessary to utilize well heater etc. that heat treated is carried out in the distortion of resin sheet, in this stage, be that small problem such as break appears when the moulding in starting point easily with the groove of lens.
Make great efforts result of study finds in order to address the above problem, use the resin of pressure dependence in particular range under the thermoplastic resin molten condition, there is not the roller that step changes even use the engraving groove shape, also can get and be stabilized to and the moulding irrelevant, required lens shape of fused deposition material state, make the present invention with this.The technical scheme that is used for the technical solution problem
That is, according to the present invention, provide a kind of rear projection screen thin plate, this thin plate is that a plurality of lens shapes are formed as rear projection screen thin plate undulatory, that thickness is 0.1～2.0mm on a kind of surface, it is characterized in that, this thin plate (i) by melt viscosity 10
2～10
3In the Pas scope, the thermoplastic resin that the gradient (W) that goes out according to the relation derivation of melt viscosity (Y) and load (X) satisfies following formula (1) forms; And (ii) the height of lens does not have the variation continuously of step ground in fact near beginning central portion or the central portion along the direction vertical with ripple to periphery;
2×10
-2≤W≤6×10
-2???????????????????????(1)
Wherein use following formulate W
W＝-(logY/X)
Wherein X represents load (MPa), and Y represents the melt viscosity (Pas) of resin.
Description of drawings
Fig. 1 is the schematic view of rear projection screen of the present invention with an embodiment of thin plate manufacturing installation;
Fig. 2 is the amplification diagrammatic sketch of engraving grooved roller one embodiment shown in Figure 1;
Fig. 3 is the section diagrammatic sketch of rear projection screen of the present invention with thin plate one embodiment;
Fig. 4 is the section diagrammatic sketch of rear projection screen of the present invention with another embodiment of thin plate;
Fig. 5 shows the section diagrammatic sketch of rear projection screen of the present invention with the another embodiment of thin plate.
Description of reference numerals
1 engraving grooved roller
2 polishing chill rolls
3 polishing chill rolls
4 fused deposition material
5 are melted the lamellar thermoplastic resin of extruding
6 T die lips
7 carry-over pinch rolls
Embodiment
Hereinafter rear projection screen of the present invention is described in detail with thin plate and manufacture method thereof.
At first accompanying drawings the present invention.Fig. 1 shows the skeleton diagram of rear projection screen of the present invention with an embodiment of manufacturing installation of thin plate.In Fig. 1, Reference numeral 1,2 and 3 is represented chill roll, and wherein, chill roll 1 or 2 or two roller surfaces are provided with a plurality of fine colyliform engraving groove shown in Figure 2 at least, and another roller and chill roll 3 are general polishing rolls.Reference numeral 4 is represented the fused deposition material, and 5 representatives are melted the plate-shaped resin of extruding, and 6 represent the T die lip, and 7 represent carry-over pinch rolls.Fig. 2 is the amplification diagrammatic sketch of the engraving grooved roller among Fig. 1.Fig. 3 shows the section diagrammatic sketch of rear projection screen of the present invention with an embodiment of thin plate.The height change of thin sheet surface lens shape is roughly corresponding with the shape of engraving grooved roller among Fig. 2 among Fig. 3.Thin sheet surface lens shape shown in Figure 3 near central portion or the central portion on the direction of periphery, the paddy portion of each lens keeps much at one surface level in the sheet gauge direction, the peak Top portion position of each lens changes to high direction.On the other hand, thin sheet surface lens shape shown in Figure 4 (enlarged drawing that does not have the diagram engraving grooved roller corresponding) with Fig. 4 near central portion or the central portion on the direction of periphery, the jag part position of each lens is at sheet gauge direction maintenance surface level much at one, the paddy portion position of each lens changes to the step-down direction, and the height of each lens uprises along the direction towards periphery as a result.On the other hand, rear projection screen of the present invention is smooth surface (flat) with the back side that thin plate has the surface of lens shape.
Hereinafter introduce the concrete manufacture method of rear projection screen with thin plate.Thermoplastic resin is melted in extruder, by T die lip 6, is squeezed out with plate-shaped; The thin plate that molten condition is squeezed out is cooled when being exerted pressure by roller 1,2 and 3 clampings.At this moment, utilize the engraving groove that is processed on the surface of roller 1 or 2, on described thin plate, process fine lens shape; After the cooling, by carry-over pinch rolls 7 tractions., needn't limit especially, and roller 1,2 and 3 also need not to adopt identical roller footpath the roller footpath of employed roller 1,2 and 3 herein.The roller footpath is usually greater than 200mm, and can preferably use roller directly is the roller 1,2 and 3 in 250～500mm same roller footpath.
The pitch of the engraving groove of employed engraving grooved roller is 40～150 μ m, preferred 50～100 μ m.If less than 40 μ m, then because melt viscosity height when thermoplastic resin molded because of resin can not enter in the roller groove fully, is difficult to realize the moulding of lens shape in fact when exerting pressure.On the contrary, if greater than 150 μ m, then, be subjected to easily because of the lens shape instability, being difficult to obtain as the stabilised quality of rear projection screen with base material because of the different influences that produce of fused deposition material shape to mouldability because thermoplastic resin enters in the groove easily.
The degree of depth of the engraving groove of Shi Yonging is 3～150 μ m in the present invention, preferred 5～100 μ m.If less than 3 μ m, inhomogeneous because of the engraving on the actual top roll, be difficult to obtain required quality.On the contrary, if greater than 150 μ m, because of the melt viscosity height of resin, mouldability does not change.In addition, when the degree of depth of design roller groove, need the transferring rate of consideration to thin plate.
Rear projection screen of the present invention depends on the pitch of engraving groove on the roller with the pitch size of lens shape on the thin plate.The pitch of lens shape is 40～150 μ m preferably, are more preferably 50～100 μ m.And, can all adopt identical pitch value by a plurality of lens shapes, the pitch of formed a plurality of lens shapes is identical on the promptly preferred described thin plate.
The height of lens shape changes according to the engraving groove depth of roller and the position that is provided with of pitch and engraved roll.In addition, needn't form lens shape comprehensively.For example, account for 1/3～1/1000 scope of sheet products width, preferably account for 1/5～1/1000 scope, the central portion that more preferably accounts near 1/10～1/1000 scope (this scope is called as the central part) can not have lens shape, and lens shape is set at the peripheral part of described central portion, different according to the size of screen and requirement, altitude range are 1～50 μ m preferably generally, is more preferably 1～30 μ m.
Relation is represented by transferring rate (lens height/groove depth) between the engraving groove depth of roller and the lens height.Transferring rate is according to changes such as gauge of sheet, forming temperature, forming pressures.If gauge of sheet diminishes, forming temperature uprises, forming pressure becomes big, then transferring rate becomes big.Transferring rate normally 20～90%.
In addition, the height of lens preferably, near central portion or the central portion to peripheral part, do not have step with displacement average out to 0.01～0.5 μ m/cm of lens height and uprise continuously.
Herein, described displacement is the interval with 5cm, the average height that the wide measured zone of selection 8mm is measured each measured zone, is the value of the displacement of each zone leveling height of unit representation with 1cm.
And, the displacement of the height of lens is more preferably the interval that dwindles above-mentioned 5cm gradually (specifically can be earlier through 3cm at interval, further be again 1cm at interval) time do not uprise with 0.01～0.5 μ m/cm numerical value with having step, the displacement that it is desirable to lens height one by one uprises under the condition of satisfied 0.01～0.5 μ m/cm no step.
Herein, so-called " no step changes " means that it is not that segmentation changes that lens height changes, but integral body changes continuously gradually.That is to say that do not arrange this step variation regularly when thin plate is used as screen for a plurality of groups of the lens of preferred equal height, this step changes the bright concealed wire that can produce light on screen.
The shape of lens preferably lens is that biconvex lens type, the lens of curve form are the prism-type of isoceles triangle shape, the linear Fresnel type that the section configuration of fresnel lenus is arranged along a direction.In order to realize the purpose of scattered light equably, especially preferably use biconvex lens type shape or have the biconvex lens type and the shape of linear the two characteristic of Fresnel type.
Hereinafter, the lens shape of thin plate of the present invention is done to introduce more specifically at biconvex lens type case of lenses.For example, the spy opens the structure of having introduced the thin plate of this biconvex lens type in flat 11-237692 communique and 6,292, No. 294 instructionss of U.S. Pat.That is, when lens shape was biconvex lens type lens, lens height was changed to the periphery lens height and highly uprises than near central portion (comprise central portion).Utilize this changing pattern of lens height, scattering properties is changed continuously, just can become bigger to the scattering angle of periphery than the scattering angle of central portion.For the scattering angle that makes periphery scattering angle greater than central portion, adopt single pitch, according to the lens height of central portion,, just can realize increasing the purpose of the lens height of periphery by changing this unit lenses curvature and outer shape.The additive method that changes scattering angle can adopt and increase the method that pitch improves the shape utilization factor successively in same curvature lens, and preferably the pitch of biconvex lens type lens is single pitches.
Hereinafter introduce the shape of above-mentioned biconvex lens type lens in conjunction with the accompanying drawings.
When the lens shape of thin plate of the present invention was biconvex lens type lens, thin plate one embodiment sectional view as shown in Figure 3 and Figure 4.In the sectional view of Fig. 3, to both sides periphery direction, the paddy portion position of each lens is basically parallel to the sheet gauge direction and is maintained at the same horizontal plane from central portion, and the height of each lens (peak Top portion) position changes to uprising direction.In the sectional view of Fig. 4, from central portion on the direction of both sides periphery, the height of each lens (jag part) position is basically parallel to the sheet gauge direction and is maintained at the same horizontal plane, the paddy portion position of each lens changes to the step-down direction.In addition, Fig. 5 is another sectional view of thin plate that pattern shows biconvex lens type lens.In Fig. 5, express from central portion to two periphery directions variation lens shapes and height.
In addition, in the manufacturing of thin plate, the shape of preferably selecting the fused deposition material generally adjust to the clamping compression roller diameter 1/100 under.If it is even to pile up the shape broad ways of material,, just do not need to limit especially the size of fused deposition material then as long as the bad order phenomenon do not occur on the thin plate of moulding; If fused deposition material shape is excessive, then generation is involved in the vestige that air bubble is arranged in thin plate.On the contrary, if the shape of fused deposition material is too small, then is easy to generate by the clamping deficiency of exerting pressure and causes the bad order of uneven thickness apperance.As the method for adjustment of fused deposition material width, have for example to rely on the automatic instrumentation control method that fused deposition material sensor is set on the radiation thermometer, the prisoner of vision to catch shooting mode, optical fiber mode, visual adjustment mold temperature and die lip method at interval etc.
The rear projection screen gauge of sheet that is obtained is 0.1～2.0mm.By adjusting the gap between the roller 1 and 2, can determine this thickness.If thickness is less than 0.1mm, the gap between the roller 1 and 2 becomes too small, and roller 1 and 2 might contact with each other.If thickness, is easy to generate the problem that is caused ghost image by internal reflection greater than 2.0mm, in addition, problems such as the decline of light percent of pass, brightness reduction and cost increase also appear, so not preferred.When thermoplastic resin was polycarbonate resin, gauge of sheet was more preferably 0.2～1.5mm, especially preferably 0.3～1.0mm.
Forming rear projection screen of the present invention is that melt viscosity is 10 with the thermoplastic resin of thin plate
2～10
3In the Pas scope, and satisfy 2 * 10 by the gradient (W) that the relation of melt viscosity (Y Pas) and load (XMPa) derives
-2≤ W≤6 * 10
-2, preferably satisfy 2.5 * 10
-2≤ W≤5.5 * 10
-2Resin.Wherein, gradient (W) is represented by ((logY/X)).
The thermoplastic resin that satisfies above-mentioned gradient (W) for example can be a polycarbonate resin etc.Adopt solution polymerization process or melt phase polycondensation to make dihydric phenol and carbonate precursor reaction, obtain described polycarbonate resin.The dihydric phenol of Shi Yonging is preferably with 2 herein, and two (4-hydroxyphenyl) propane (common name bisphenol-A) of 2-are main material.Its part or all can replace by other dihydric phenol.Other dihydric phenol for example can be 1, two (4-hydroxyphenyl) ethane, 1 of 1-, two (4-hydroxyphenyl) cyclohexanes, 2 of 1-, two (the 4-hydroxyls-3 of 2-, the 5-3,5-dimethylphenyl) propane, 2, two (the 4-hydroxy-3-methyl phenyl) propane of 2-, two (4-hydroxyphenyl) sulfide, two hydroxyl (4-hydroxyphenyl) sulfone etc.More preferably polycarbonate resin is wherein whole more than 50% moles of dihydric phenol, the particularly resin of being made up of bisphenol-A more than 70% mole.Carbonate precursor for example can be that the PVC ス Network ロ ロ ホ-メ-ト, carbonic acid two P-xylene esters, carbonic acid phenylester of phosgene, diphenyl carbonate, above-mentioned dihydroxy phenols is to toluene ester, two pairs of chlorobenzene esters of carbonic acid, carbonic acid dinaphthyl ester etc.Preferably phosgene and diphenyl carbonate.
Hereinafter the basic mode of this manufacture method is simply introduced.Use for example reaction of phosgene (solution polymerization process) of carbonate precursor material, in the presence of sour bonding agent and solvent, react usually.As sour bonding agent, can use for example amines such as alkali metal hydroxide such as NaOH, potassium hydroxide or pyridine.As solvent, can use for example halogenated hydrocarbon such as methylene chloride, chlorobenzene.In addition, for example also can using, catalyzer such as tertiary amine or quaternary ammonium salt reacts with promotion.At this moment, normally 0～40 ℃ of temperature of reaction, normally several minutes～5 hours reaction time.
Use carbonic diester to pass through under inert atmosphere, in dihydric phenol composition that heats predetermined ratio and carbonic diester, to stir, distillate the alcohol of generation or the method for phenols and carry out as the ester exchange reaction (melt phase polycondensation) of carbonate precursor material.Though temperature of reaction is with the alcohol that generates or the differences such as boiling point of phenols, normally 120～350 ℃.Reaction is finished reaction since the initial stage decompression in alcohol that distillates generation or phenols.In addition, in order to promote reaction, also can use the catalyzer that in ester exchange reaction, uses usually.Employed carbonic diester for example can be diphenyl carbonate, carbonic acid dinaphthyl ester, carbonic acid bigeminy phenyl ester, dimethyl carbonate, diethyl carbonate, dibutyl carbonate etc. in the above-mentioned ester exchange reaction.Wherein, preferably use diphenyl carbonate.
If gradient W satisfies 2 * 10
-2≤ W≤6 * 10
-2, then the degree of polymerization to polycarbonate resin does not have particular restriction.When making this polycarbonate resin, as required, can add incombustible agent, colorant, lubricants etc. such as suitable molecular weight regulator, the branching agent that is used to improve processability, the low-molecular polycarbonate that promotes stabilizing agents such as catalyst for reaction, phosphite ester, phosphate, phosphonate ester, tetrabromobisphenol A, tetrabromobisphenol A, decabrominated dipheny base ether.
Dissolving 0.7 gram polycarbonate resin is measured down its specific viscosities at 20 ℃ in 100 milliliters methylene chloride, preferably this specific viscosity in 0.25～0.7 scope, the more preferably polycarbonate resin in 0.3～0.6 scope.
Preferably thermoplastic resin composition's (particularly poly carbonate resin composition) as the resin granular solids of scattering diluent forms rear projection screen of the present invention by being mixed with thin plate.
It is the spheroidite of 1～50 μ m that the resin granular solids that uses as used scattering diluent preferably uses mean grain size, more preferably uses the spheroidite of 3～30 μ m.If particle diameter less than 1 μ m, then the scattering properties of scattering diluent is low; If greater than 50 μ m, because particle diameter is too big, the bad goods that the surface produces convex-concave appear then, not preferred because of producing the existing edge that dazzles.Because the refractive index of resin granular solids depends on that the optics of rear projection screen requires characteristic, thereby there is not special pearl to limit to the refractive index of resin granular solids, generally be adapted in 1.42～1.60 scopes, preferred 1.45～1.60 scope is more preferably in 1.50～1.60 scopes.
The instantiation of resin granular solids has partial cross-linked polymethacrylate resin or polystyrene resin etc., and it is that (ponding changes into product industry (strain) company and makes the polymer based particulate: MBX-5 that suitable object lesson has with partial cross-linked methyl methacrylate, MBX-20), with partial cross-linked styrene is that (ponding changes into product industry (strain) company and makes the polymer based particulate: SBX-8), with partial cross-linked styrene and acrylic acid multipolymer is that (Paul Kearns (ガ Application Star) changes into product industry (strain) company and makes: GSM-8 and ponding change into product industry (strain) company and makes the polymer based particulate: SM10X-12JH, MS10X-12D), have the core/shell-type モ ノ ホ Le ジ of the shell of the core/polymethylmethacrylate that is comprising butyl polyacrylate-polymkeric substance (Luo Mu and Han Si company (ロ-system ア Application De Ha-ス カ Application パ ニ-) make: formaldehyde and cloves oil compound preparation (パ ラ ロ イ De) EXL-5136) etc.The addition of resin granular solids is because of rear projection screen poor and different with the refractive index of gauge of sheet and thermoplastic resin and resin granular solids, and relative 100 parts by weight of thermoplastic resin are preferably added the resin granular solids of 0.01～2.0 weight portion.If more than 2.0 weight portions,, can not bring into play as the function of rear projection screen with thin plate then because scattering is strong excessively.
In order to prevent that rear projection screen of the present invention from adhering to dust on the thin plate, can carry out electrostatic prevention with thin plate to rear projection screen of the present invention and handle.The electrostatic prevention disposal route for example can be with antistatic agent mixing in resin method, be applied to antistatic agent on the roller or atomized spray is applied to the first-class method of thin plate.
Rear projection screen of the present invention can flow into radiation curing resin in the mould have with negative shape such as fresnel lenus layer with thin plate, and with the reverse side lamination of rear projection screen with the face with lens shape of thin plate, under this state with the irradiation of ultraviolet isoradial, become solidify rear projection screen that lamination forms with the fresnel lenus sheet applications on projection TV etc.
In addition, rear projection screen thin plate of the present invention is to be formed as undulatory rear projection screen by (1) lens shape to be formed as undulatory rear projection screen thin plate with thin plate, (2) lens shape, wherein, ripple direction on this thin plate is vertical mutually with the ripple direction on the thin plate of above-mentioned (1), (3) the fresnel lenus layer is arranged stacked rear projection screen in any order, also can use as rear projection screen above-mentioned (1) and/or (2) with thin plate.From observer's side, this configuration best according to (1), (2) and (3) order or the order of (1), (3) and (2).
According to the present invention, when producing in fused deposition material mode by the roller that uses the groove shape broad ways not have the variation of step ground regularly, by using the pressure dependence thermoplastic resin in particular range in fact under the forming temperature condition, can be easily, low-cost and the plate of the rear projection screen with high-precision lenses shape stably is provided.
Hereinafter introduce the present invention in conjunction with the embodiments in more detail.
Utilize flow tester ((strain) Shimadzu Seisakusho Ltd.: CFT-500C) and diameter be that 1.0mm and length are the nozzle of 10mm, in load is that 4.9～29.4MPa (4.9MPa, 9.8MPa, 19.6MPa, 29.4MPa) and temperature are under 280 ℃ the condition, measures 5 resin flow value (cm for different load MPa
3/ S), ask for melt viscosity (Pas) according to each mean value, be that the logarithm of transverse axis, melt viscosity (Pas) is the longitudinal axis with load MPa, draw coordinate figure, ask gradient W.
(the accurate system in (strain) Tokyo: サ-Off コ system SE-1100), at cut-out value 0.8mm, measure under the condition of length 8mm, broad ways (direction vertical with ripple) is measured the lens shape of rear projection screen with thin plate to use contact pin type surfaceness meter; Transfer printing mensuration is used above-mentioned surfaceness meter, and with the spacing of 5cm, (1, the 000mm) shape at the central portion of direction and both ends is asked for each lens height and its rate of change at 5 width of locating to measure thin plate on the direction of extrusion.With the mean roughness Rz that measures ten points (according to datum line, from the highest begin to measure to the 5th point ask for the mean value that absolute altitude is gone up on the top, beginning to measure the mean value of asking for the valley floor absolute altitude to the 5th point from the bosom, is mean roughness with the difference of above-mentioned two mean values) as the height of lens.
Calculate the rate of change with following formula.
The situation of variation in altitude rate less than 5% between each district represents with zero, and the variation in altitude rate is that 5～10% situation represents that with △ the variation in altitude rate is than 10% big situation usefulness * expression.
Radiation cure type resin is flowed into have been implemented in the Fresnel processed mould, carry out stacked with rear projection screen with the face that thin plate does not carry out moulding, under stacked state, make its sclerosis make rear projection screen, actual assembled is on 50 inches projection TV, its image of visual valuation, estimate the screen outward appearance thus, represent that the brightness uniformity of picture is high and do not have ghost image with zero, represent ghost image to occur on the brightness irregularities of central portion and end and end obfuscation or the picture with X.
Utilization is provided with the extruder of device shown in Figure 1, and making thickness is the rear projection screen thin plate of 0.2～1.0mm.
Use width to be the polishing chill roll of 360mm and diameter the engraving grooved roller (degree of depth minimum of the groove of central portion as 360mm as the T die lip of 1200mm and 2 diameters, the edge is towards end direction, each pitch groove degree of depth is all deepened), (embodiment 1: specific viscosity 0.450 to carbonic acid vibrin that bisphenol-A and phosgene reaction by the melting characteristic with table 1 record gradient W are obtained, embodiment 2,4～7 and comparative example 3: specific viscosity 0.425, embodiment 3: the organic fine particles that adds table 2 record specific viscosity 0.365), addition is documented in the table 1, under 280 ℃ of conditions of bowl temperature, from the T die lip is that the mode of 300kg/hr is extruded into plate shape with the discharge rate, carry out clamping with engraving grooved roller and polishing chill roll, carry out moulding and utilize carry-over pinch rolls to draw with fused deposition material mode, the rear projection screen thin plate of acquisition table 1 record.The temperature of polishing chill roll 2 and 3 is respectively 120 ℃ and 140 ℃, and the temperature of engraving grooved roller is set to 110 ℃.Evaluation result is illustrated in the table 1.Thus obtained rear projection screen has obtained the good image of no ghost image not because of moisture absorption causes size distortion and warpage.
In addition, use above-mentioned contact pin type surfaceness meter broad ways (with the ripple vertical direction) that the thin plate (wide 1000mm) that obtains among the embodiment 5 is measured, under the condition of cut-out value 0.8mm, measurement length 8mm, adopt the spacing of 5cm, ask for the height of lens, measurement result is listed in the table 3.In addition, with 10 mean roughness Rz (according to datum line, begin to measure the mean value of asking for page last absolute altitude to the 5th point from the highest, begin to measure the mean value of asking for the valley floor absolute altitude to the 5th point from the bosom, difference with above-mentioned two mean values is a mean roughness) be the height of lens, measure.
Comparative example 1
Using gradient W is that (Nippon Steel's chemistry is made: エ ス チ レ Application MS-800) as the substitute of polycarbonate resin for 0.235 methacrylic acid and cinnamic copolymer resin, others adopt condition substantially the same manner as Example 2, obtain the rear projection screen thin plate of table 1 record, and evaluation result is documented in the table 1.As can be seen from the table, because gradient W height, then the pressure dependence of resin becomes big, thereby is subjected to the influence of fused deposition material change big during moulding, and particularly the rate of change of the lens shape height of end increases, and deviation occurs in the brightness of image.
Comparative example 2
Using gradient W is that (Nippon Steel's chemistry is made: worker ス チ レ Application MS-800) as the substitute of polycarbonate resin for 0.235 methacrylic acid and cinnamic copolymer resin, others adopt condition substantially the same manner as Example 5, the rear projection screen thin plate of acquisition table 1 record.In table 1, put down in writing evaluation result.
Comparative example 3
Except thickness is 3.0mm, use the polycarbonate resin acquisition rear projection screen thin plate that has same slope W with embodiment 2, in table 1, put down in writing evaluation result.Owing to increased resin thickness, screen is estimated, can find ghost image, ambiguous image appears in the contrast step-down generally.
Table 1
Table 2
| Scattering diluent | The name of an article | Manufacturer | Refractive index | Mean grain size (μ m) |
| Scattering diluent A | ?SM10X-12JH | Ponding changes into product industry | ?1.566 | ????12 |
| Scattering diluent B | ?MS10X-12D | Ponding changes into product industry | ?1.530 | ????12 |
| Scattering diluent C | ?G-SM8 | ガ Application Star changes into | ?1.566 | ????8 |
Table 3
| Measuring position (cm) (since the distance of an end) | Lens height (μ m) |
| ????0 | ????7.3 |
| ????5 | ????6.5 |
| ????10 | ????6.1 |
| ????15 | ????5.8 |
| ????20 | ????5.2 |
| ????25 | ????4.6 |
| ????30 | ????3.9 |
| ????35 | ????2.7 |
| ????40 | ????2.1 |
| ????45 | ????1.8 |
| ????50 | ????1.5 |
| ????55 | ????1.9 |
| ????60 | ????2.8 |
| ????65 | ????3.3 |
| ????70 | ????4.4 |
| ????75 | ????4.8 |
| ????80 | ????5.4 |
| ????85 | ????5.8 |
| ????90 | ????6.3 |
| ????95 | ????6.4 |
| ????100 | ????7.2 |
Claims (14)
1, a kind of rear projection screen thin plate, this thin plate are that the surface goes up that a plurality of lens shapes are formed as corrugated, thickness is the rear projection screen thin plate of 0.1～2.0mm, it is characterized in that: this thin plate (i) by melt viscosity 10
2～10
3In the Pas scope, the thermoplastic resin that the gradient (W) that goes out from the relation guiding of melt viscosity (Y) and load (X) satisfies following formula (1) forms; And (ii) the height of lens does not change there to be the step continuation mode in fact to periphery along the direction vertical with ripple near beginning central portion or the central portion;
2 * 10
-2≤ W≤6 * 10
-2(1) wherein uses following formulate W
W=-(logY/X) wherein, X represents load (MPa), Y represents the melt viscosity (Pas) of resin.
2, rear projection screen thin plate according to claim 1, it is characterized in that: the pitch of lens shape is 40～150 μ m, the height of lens shape is 1～30 μ m.
3, rear projection screen thin plate according to claim 1 is characterized in that: described a plurality of lens shapes are to adopt same pitch to form.
4, rear projection screen thin plate according to claim 1, it is characterized in that: lens shape is biconvex lens type, prism-type or linear Fresnel type.
5, rear projection screen thin plate according to claim 1, it is characterized in that: lens shape is the biconvex lens type.
6, rear projection screen thin plate according to claim 1, it is characterized in that: lens shape has biconvex lens type, prism-type, linear Fresnel type characteristic or has the biconvex lens type and the characteristic of linear Fresnel type.
7, rear projection screen thin plate according to claim 1, it is characterized in that: thermoplastic resin is a polycarbonate resin.
8, rear projection screen thin plate according to claim 1 is characterized in that: along near central portion or the central portion to the peripheral part direction, the height of the lens of this thin plate is that 0.01～0.5 μ m/cm does not have step and changes continuously with the displacement of lens height.
9, rear projection screen thin plate according to claim 1 is characterized in that: described thin plate is that the composition of the resin granular solids of 1～50 μ m forms by the mean grain size that comprises 0.01～2.0 weight portion in 100 parts by weight of thermoplastic resin.
10, as rear projection screen thin plate as described in the claim 9, it is characterized in that: the refractive index of described resin granular solids is 1.42～1.60.
11, a kind of rear projection screen, this screen comprise the described thin plate of claim 1 as one in the compound formation plate.
12, a kind of transmission-type fresnel lenus thin plate, this thin plate disposes the fresnel lenus layer on the back side of the described rear projection screen of claim 1 with the face with a plurality of lens shapes of thin plate.
13, a kind of rear projection screen, this screen is (1) a plurality of lens shapes to be formed as undulatory rear projection screen be formed as undulatory rear projection screen thin plate with thin plate, (2) a plurality of lens shapes, wherein, ripple direction on this thin plate is vertical with the ripple direction on the thin plate of above-mentioned (1), (3) the fresnel lenus layer disposes the rear projection screen that forms in any order, and the rear projection screen thin plate of wherein above-mentioned (1) and/or (2) is the described rear projection screen thin plate of claim 1.
14, a kind of projection TV, this TV are assembled with described thin plate of each claim or rear projection screen in the claim 11,12 or 13 on display surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101203607A CN1496814A (en) | 2002-10-09 | 2003-10-09 | Thin plate for transmission screen and transmission screen using the thin plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP296087/2002 | 2002-10-09 | ||
| CNA2003101203607A CN1496814A (en) | 2002-10-09 | 2003-10-09 | Thin plate for transmission screen and transmission screen using the thin plate |
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| Publication Number | Publication Date |
|---|---|
| CN1496814A true CN1496814A (en) | 2004-05-19 |
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101223460B (en) * | 2005-07-14 | 2010-05-19 | 帝人化成株式会社 | Foamed resin sheet and liquid crystal display |
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2003
- 2003-10-09 CN CNA2003101203607A patent/CN1496814A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101223460B (en) * | 2005-07-14 | 2010-05-19 | 帝人化成株式会社 | Foamed resin sheet and liquid crystal display |
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