WO2005088358A1 - 光拡散板及びその製造方法 - Google Patents
光拡散板及びその製造方法 Download PDFInfo
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- WO2005088358A1 WO2005088358A1 PCT/JP2005/004743 JP2005004743W WO2005088358A1 WO 2005088358 A1 WO2005088358 A1 WO 2005088358A1 JP 2005004743 W JP2005004743 W JP 2005004743W WO 2005088358 A1 WO2005088358 A1 WO 2005088358A1
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- light
- less
- cavity
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- unevenness
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
- B29C45/60—Screws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C2045/0086—Runner trees, i.e. several articles connected by a runner
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
Definitions
- the present invention relates to Hikari i! W and the like. More specifically, the present invention relates to a light diffuser which has high luminance, has low luminance unevenness, and provides a high quality display ⁇ in a liquid crystal display device, and relates to its manufacture. Background scythe
- Liquid crystal display devices have been widely used in non-sound computers, televisions, portable telephones, mobile phones, and the like. In the future, with the advancement of liquid crystal display devices and higher performance, it is expected that the power of the Pife tube display device will be higher than that of liquid crystal display devices.
- a side light which requires an external light source and has an original placed on the side edge of the liquid crystal display device, and a practically illuminated device located on the back of the liquid crystal display device.
- the device unit can be made thinner, but the brightness power S is low, so that a high level and brightness are required.
- a light source such as multiple cooling tubes is placed behind the device housing.
- the light that has been Alt-diffused by the light image is diffused and converted into uniform, planar light. If necessary, provide a reaction behind the cold Pt tube, apply gradation printing on the back side of the light diffusion sheet, and stack a light-condensing sheet, diffusion sheet, etc. on the front side of the light diffusion sheet.
- the light source is required to have a good balance of efficiency and light diffusion, to have no warp, to have a + ⁇ bow boat, and to have low brightness unevenness s.
- an expanded thermoplastic resin containing a light diffusing agent is used as the light material.
- Examples of the contact method of light include extrusion fiber casting, casting, and injection swelling. According to the extrusion extrusion method, it is possible to efficiently obtain the raw material sheet of the light spread basket, but it takes time and effort to make a recommendation for the light spread, and waste of material occurs. According to the casting method, the bow is higher
- a net-shaped rib portion S is formed on the surface or ⁇ of the basket, and a concave portion is formed in a region corresponding to the mesh of the rib portion. It is formed so that light emission unevenness does not substantially occur due to the difference between the thickness of the expansion at the concave portion and the thickness of the expansion at the rib portion.
- Patent Document 2 since the height of the ribs is preferably 3 mm or less, the force S is preferable, and it is more preferable that the height is about 2 mm. Have difficulty.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2003-2997 1200 ⁇ Report (Page 2-3, FIG. 3)
- An object of the present invention is to provide a light-spreading device capable of obtaining a high-quality display in a liquid crystal display device with high luminance and low luminance unevenness, and a method of manufacturing the same.
- the inventors of the present invention have worked diligently to solve the above-mentioned tones, and as a result, the length of the diagonal line is equal to or more than 400 mm: the thickness of the light is less than 200 ⁇ . , Warpage of 2 mm or less, transmittance unevenness of 8% or less, variation of y value of reflected light of 0.04% or less, high-quality display in liquid crystal display devices with high brightness and low brightness unevenness ⁇ is obtained.
- Such a light expansion is achieved by using a screw with mixing leakage, selecting a specific number of pinpoint gates according to the fiber and thickness of the main surface of the light, and the space of the ejector space.
- the part can be easily manufactured by injection molding with 0.01% to 80% of the ⁇ of the main surface of the cavity. We found what we could get and made this effort based on this finding.
- the thickness unevenness is 200 ⁇ or less
- the warpage is 2 mm or less
- the light is transparent.
- thermoplastic resin is injected using an injection molding machine equipped with a screw whose L / L is 0.03-0.5.
- the light according to (1) which is obtained by injection molding
- thermoplastic resin is a polymerized fiber having an alicyclic ⁇ fit, (1) to (4) above,
- FIG. 1 is an explanatory view of a substantially rectangular light 3 ⁇ 43 ⁇ 43 ⁇ 4, FIG. 2 is an example of a screen having a mixing mechanism, FIG. 3 is another example of a screen having a mixing mechanism!], F i g. 4 is mixing: another example of a screue with f if, Fig. 5 is a mixin, another example of a screue with «Fig. 6 is another example of a screue with mixi, Fig. 7 is another example of a screw having a mixing mechanism, FIG. 8 is another example of a screw having a mixing mechanism, FIG. 9 is another example of a screw having a mixing mechanism, FIG. ig. 10 is another example of a skew with a mixing tree, FIG.
- reference numeral 1 denotes a fixed-side counterattack
- 2 denotes a fixed-side template
- 3 denotes a side plate
- 4 denotes a spacer block
- 5 denotes a regular template
- 6 denotes a spno bush
- 7 denotes a cavity
- 8 denotes a cavity.
- Ejector plate, 9 is the ezeta turret pin
- 10 is the support pillar
- 21 is the hopper for the master batch
- 22 is the hopper for the Naziyura Nore pellet
- 23 is the time ⁇ Automatic weighing machine
- the tank, 26 is made of Nada
- 27 is made of injection-grown fiber.
- the light of the present invention has a thickness irregularity of 200 ⁇ m or less, in contrast to a light expansion sheet having a B-square shape formed by injection molding of a thermoplastic resin and having a diagonal length of 400 mm or more, This is a light ifetfct with a warpage of 2 mm or less, transmittance unevenness of 8% or less, and a variation of y value of the reflected light of 0.004 or less.
- Diagonal length force S Light spreading of / J of less than 400 mm is less likely to cause uneven thickness and warping force S, and the incorporated LCD device is also / J. Even if there is a variation in the image quality, the image quality does not matter much.
- the thickness unevenness is more preferably 150 m or less, further preferably 100 ⁇ m or less. By reducing the thickness unevenness, the luminance uniformity can be improved.
- the warpage is more preferably 1.5 mm or less, and further preferably 1.0 mm or less. By reducing the warpage by / J, the assembling ability of the liquid crystal display device becomes easy, and the uniformity of the liquidity can be improved.
- the i-rate unevenness is more preferably 7% or less, and even more preferably 6% or less. The brightness uniformity can be improved by reducing the non-uniformity.
- the variation of the y value of the ⁇ f light is more preferably 0.003 or less, and further preferably 0.002 or less.
- the power of the light of the present invention is preferably 0.4 to 5 mm, more preferably 0.8 to 4 mm.
- the thickness is smaller than 0.4 mm, it is necessary to devise a method of suppressing the deflection due to its own weight, such as forming a support column, thereby increasing the cost S of the backlight. If the thickness exceeds 5 mm, it tends to be difficult.
- the light feW usually has a rounded convex for attachment to a liquid crystal display device, and is often not an accurate rectangular shape.
- ⁇ Measure the diagonal length of a rectangle formed by extending each side as a light expansion rectangle. At this time, each side is extended to form a rectangle so that the sum S of the portion caught by the extension of each side and the portion to be removed is minimized.
- FIG. 1 is an explanatory diagram of light having a warm square shape. As shown in the three examples in this figure,
- each side at point J Extend each side at point J to form a rectangle, as in 3 ⁇ 43 ⁇ 4i ". For example, do not extend each side as shown by the one-point corrugated line in the middle figure.
- the thickness, the ratio, and the y value of the Sit light are obtained by drawing four virtual straight lines parallel to each side inwardly of each side of the main surface of the light beam 20 mm inward, and each of the two opposite lines. 3 imaginary fountains, and divide the fountain into four equal parts, so that a total of 10] lines can be intersected at the 25 typical intersections It is preferable to measure.
- the thickness unevenness is measured using an ultrasonic thickness gauge, and the difference between the maximum thickness and the minimum thickness is measured. Can be uneven in thickness.
- the unevenness of the rate can be obtained by measuring the ⁇ Si rate according to JIS K 7361-1 using an integration rule determining device and calculating the maximum value and the minimum 3 ⁇ 4 ⁇ average value by the following equation.
- the variation in the y value of the light is measured in accordance with JISZ 8722 using a colorimeter, and the difference between the maximum value and the minimum value is calculated as the variation in the y value of the It light. You can do it.
- the fiber is horizontally laid with the corner of the light floating, and the rising amount is measured at the four corners, and the average value can be used as the warpage.
- the brightness and the degree of uniformity were determined by removing the liquid crystal cell, optical sheet, and light spreader of a commercially available liquid crystal television, mounting the light spreader obtained by injection molding, without attaching the optical sheet, and measuring uneven thickness.
- the front luminance is measured using a luminance meter, the average value is calculated, and the luminance uniformity can be calculated by the following equation. '
- the screw in the thickness unevenness, the warpage, the ⁇ ⁇ ii rate unevenness, and the power of the variation of the y value of the Sit light S small and large light, the screw has a mixing leak, the screw length is L, and the mixing is ;
- the length of the It structure is 1 ⁇
- the mixing leakage of the injection-grown screw used in the present invention for example, various pins provided on the screw shown in FIG. 2 and FIG. Nori type shown in 4-7, various barrier flight screws shown in Fig. 8, solid draining screw shown in Fig.
- double-Ave screw shown in Fig. 10 Fig. Examples include the HM screw shown in FIG. Among them, the Paria type screw shown in FIG. 4 can be suitably used.
- One of these mixing leaks can be used in warriors, or two or more can be used in combination. It is preferable that the mixing liquid be provided at JB ⁇ of the screw or in the fourth part of the description.
- the mixing and screw having a mechanism are preferably such that when the length of the screw and the length of the mixing mechanism are L and I ⁇ ZL are 0.03 to 0.5, respectively. It is more preferable that I ⁇ / L is 0.05 to 0.4.
- the length of the mixing it is the total length of a portion provided with a ridge for enhancing the result, in addition to the single main flight of the screw. For example, in a skew in which a single flight screw is provided with a dalmage at the word *, the depth of the mixing neck from the last rule of the dalmage to the tip side is the length of the mixing screw. In a double flight screw provided with a flight, the length of the area where the sub-flight is located is the mixing length.
- the thickness unevenness, the warpage, the rate unevenness, and the ⁇ variation force S of the y value of f light S small, large light expansion 1 3 ⁇ 4, 3 ⁇ 4 (mm 2 ) of the main surface of the cavity, and the depth of the cavity when was the t (mm), the number of gates, and a ⁇ sZ (t + 2) ⁇ X 10 one 4 or more, Chikaratsu 2 n (n is: 1-5 integer) multipoint pin is It can be manufactured by injection molding of a thermoplastic resin using a mold having a point gate.
- ⁇ may be generated in the molten resin, and the resin may not be filled or distortion may remain in the light.
- N is ⁇ from 1 to 5, that is, the number of gates is 2, 4, 8, 16, or 32. S is preferable.
- the number of gates is 64, the mold runner The structure becomes » which may make it difficult to perform stable injection molding.
- Fig. 12 has 2 gates
- Fig. 13 has 4 gates
- Fig. 14 has 6 gates
- Fig. 15 has 8 gates
- Fig. 16 has Gut.
- Hata indicates the position of the sprue
- ⁇ indicates the gate position
- the straight line indicates the runner.
- the length of the runner from the sprue to each gate is the same, and the injected molten resin flows through the same ggfi runner in multiple gates. After that, since the cavities are satisfied, it is possible to obtain uniform and non-distorted light.
- the flow of molten resin from each gate into the cavity in the cavity becomes shorter, so the molten resin is injected into the cavity from one side gate.
- the runners from the sp to each gate have the same g value, but the runner branches to an acute angle.
- the molten resin and the molten resin that bends at an obtuse angle may cause a difference in the Nada state.
- Fig. 13 Fig. 15 and Fig. 16 if the number of gates is 2 n , all runners can branch into two at right angles. It is possible to make the flow state of the molten resin at each of the branch points and the gates all equal, and to generate light ifeW that is uniform and free from optical distortion.
- the present invention Te per cent Rere divides a substantially rectangular Kiyabiti about the same " ⁇ like the 2 n rectangles
- FIG. 17 is an explanatory diagram of a gate position of a mold having four gates. Divide the almost rectangular cavity into four rectangles of approximately the same shape, as indicated by the dashed dotted lines in the figure. For the division into 2 n rectangular shapes, it is preferable to divide the rectangular fibers into a shape such that the ratio of the divided rectangular fibers is closest to 1.
- a gate be provided within a circle whose judgment is 0.1 times the length of the diagonal line with the intersection of the diagonal lines a and b of the divided rectangle as the center. If the gate is located outside the circle O, the flow of the molten resin in the cavity will be biased, which may make it difficult to obtain a light diffusion plate with good luminance uniformity.
- the size of the pin tip of the pin point gate is not particularly limited, and can be appropriately selected depending on the size of the wisteria and the number of the pin point gates.
- the force S is preferably 4 mm, and more preferably 1 to 3 mm in diameter. If the diameter of the gate tip is less than 0.8 mm, it takes time S to fill the resin, or
- the molten resin may be degraded at the gate tip (Step 5). If the diameter of the tip of the gut exceeds 4 mm, the gate marks are conspicuous and the working load may take a lot of effort S.
- a vacuum evacuation hole is provided in the ⁇ to evacuate the cavities during the injection of the molten resin, thereby releasing the air in the cavities.
- the diameter of the evacuation hole can be appropriately selected according to the difficulty of the resin to be molded.
- the resin having a relatively good property ⁇ has a pore diameter of 0.02 to 0.5 mm, preferably a force S, and the resin having a relatively poor property ⁇ ⁇ has a pore diameter of 0.05-0 . 2 mm force S preferred.
- the vacuum evacuation hole is located at an intermediate position between two gates, and that the age at which four or more gates are covered is a rectangle formed by four or more gates.
- the power is preferably S1 ".
- FIG. 18 is an explanatory diagram of the position of a vacuum hole of a mold having eight gates. In the figure,. Indicates the gate position, and ⁇ indicates the position of the vacuum hole. The three rectangles shown in the figure are formed by imaginarily connecting the gates with one-point solid lines. A vacuum hole is provided at the center of each rectangle.
- the pressure S in the cavity at the start of the emission is preferably 50 kPa or less, and more preferably 35 kPa or less. If the pressure in the cavity at the start of injection exceeds 5 OkPa, the trueness of the molten resin in the cavity will be insufficient, and gas burning may also occur.
- the ejector space when the ejector space is cut by a plane that is different from the principal plane of the cavity, the unevenness in thickness, warp, unevenness in translation, and variation in the y value of M light are small. It can be manufactured by injecting a thermal resin using a mold having a cross-sectional area of 0.01 to 80% of the area of the main surface of the cavity.
- the ejector space refers to a plane including the ejector plate at a position where the ejector plate force S is retracted in the injection inflation mold, and an ejector press space.
- FIG. 19 is an explanatory diagram of a mold ejector space.
- the fixed side plate 1 is attached to the fixed side plate 2, and the side plate 3 is attached to the “side side plate 5” through the space serve 4.
- the fixed side mold plate is provided with a spoon "bushing 6 force S”, and the side mold plate is provided with a light cavity 7 force S force.
- the light expansion is protruded by four ejector pins 9 attached to the ejector plate 8.
- the ejector plate moves between a and b in the figure, and the space between plane a and plane b is the ejector space.
- a support villa 10 for the movable mold plate.
- 1 9 of the lower is the value ⁇ sectional view taken ⁇ ] cross at Kiyabiti main surface TO 1 plane passing through the Ejekuta one space A- A line.
- the position corresponding to the main surface of the cavity is indicated by a one-point line.
- the cross section of the space is preferably 0.01 to 80% of the area of the cavity main surface. It is more preferably from 0.2 to 75%, and still more preferably from 0.3 to 50%.
- the principal surface of the cavity is the upper surface of the light beam or the surface corresponding to T®. If the area of the space is less than 0.01% of the area of the main surface of the cavity when the space of the ejector is cut along the plane of the main surface of the cavity and the TO, the arrangement of the ejector / plate / ejector / pin is limited. As a result, mold fabrication may become difficult.
- the space is cut by a plane that is the principal plane of the cavity, and the space in the space exceeds 80% of the space of the cavity, the «deforms when the swelling occurs and the light spreads. The thickness unevenness may be increased.
- the method of cutting the space portion when the ejector space is cut along the plane of the cavity main surface and the TO for example, the size of the spacer block or the support villa.
- the size of the spacer block or the support villa By measuring the size and the length of the space, it is possible to adjust the width of the space.
- the shape of the support villa For example, in addition to the circular support villa specified in JIS ⁇ 5116, the support villa of a triangle, a square ⁇ ⁇ , a hexagon; be able to.
- the injection molding is supplied to the injection molding for injection molding. As a result, it is possible to obtain high-quality light rays with a small variation in the characteristic using a master batch containing various additives at a high concentration.
- the promoting agent contained in the master patch there is no particular limitation on the promoting agent contained in the master patch.
- filling agent u, ⁇ m wei, luminous lubricant, antioxidant, ultraviolet absorber, light scythe, stimulant, coloring agent examples include a charged ⁇ 3 ⁇ 4-stop, rnrn mkmi, a cross-linking agent, ii a coupling tie IJ, a thickener, and a ⁇ fiber mt-brunge agent.
- the number of additives contained in the master patch For example, a master patch containing only one kind of additive can be used, or a master batch containing a combination of two or more kinds of excipients can be used. You can also.
- the concentration of the additive to be contained in the masterbatch is not particularly limited, and may be appropriately determined in consideration of the content of the additive to be included in light, the mixing ratio of the natural wax pellet and the masterbatch, and the like. ⁇ can be scaled.
- the production of the master batch for example, natural pellets and additives are mixed at a predetermined ratio, kneaded using a twin-screw extruder or the like, extruded in a strand shape, and using a pelletizer or the like. It can be manufactured by pelletizing by heating.
- natural pellets are those containing no additives, thermoplastics (plastic pellets or pudding agent content of 5% by weight or less, preferably 3% by weight or less, particularly preferably Is a pellet of a thermoplastic resin having a weight of 0 / .
- the pellet of a thermoplastic resin having a small amount of an additive is, for example, added to a prestigious agent when producing a thermoplastic resin. It can be manufactured by mouth.
- the term "automatic wording machine” refers to a measuring machine that receives a rule set and then outputs and outputs the rule set.
- the order in which the natural pellets and the master batch are dried by a car is not particularly limited.
- the natural pellets and the master batch are weighed by an automatic weighing machine, and the weighed natural pellets and the master batch are mixed. After mixing with a machine, the resulting mixture can be subjected to injection growth, and then used for injection growth.
- Natural pellets and master batches are dried in Sagami, and dried natural pellets and Batch master patch After the natural pellets and the master patch are weighed by the automatic weighing machine and mixed with the mixer, the yarn can be fed to the injection molding, or the natural pellets and the master batch can be turned. After the measurement, the weighed natural pellets and the master patch are dried by drying, and the dried natural pellets and the master batch are mixed by a mixer, followed by injection molding.
- Natural pellets and master batches are mixed and measured with a batch type automatic weighing machine. Natural pellets and master batches are mixed with a mixer, and the resulting mixture is dried with a dryer and then injected. The yarn is supplied to Fuji Fiber; after the mixture of the natural pellets and the masterbatch is used, there is no danger of moisture absorption during the injection process until 1 ", and only one car is used. It can be particularly preferably performed because the processing can be performed by
- FIG. 21 is a process flow diagram of a fiber for supplying a mixture of natural pellets and a master batch to an injection dripping.
- hopper for master batch 2 In this sickle, hopper for master batch 2
- An automatic weighing machine 23 equipped with 1 and a hopper for Vietnameseurano W retlets 2, a mixing machine 24, a material tank 25, a dry thigh 26, and a fiber 27 are connected in this order.
- the master batch and the natural pellets are automatically weighed batchwise.
- Nazi Yura Honoré Perret Tsu preparative Honno ⁇ 0 one 2 2 by a predetermined amount of the master patch and natural Perret bracts provided with master batch hoppers one 2 1 and Rodosenore provided mouth one load cell by saying +4, weighing machines Drop into the lower receiving tank.
- the master patch is weighed by an automatic f + 4 machine, and then the natural pellet having a predetermined weight ratio corresponding to the master patch amount is weighed by the automatic weighing machine and added to the master batch.
- the force S is preferable.
- the dose ratio means a four-fold mixing ratio determined in advance by calculation according to the characteristics of the target light source.
- the mixing ratio may be slightly less than the set value. After accurately weighing the masterbatch, the natural pellets in the required ratio are spun ⁇ ; by weighing with an automatic weighing machine and closing the masterpatch, the mixing ratio between Vietnameseura / Rettot and the masterpatch is accurately controlled can do.
- the natural pellets and the masterbatch are mixed uniformly in a mixer so that the number of males is 20 or less.
- a mixer there is no particular limitation on the way the natural pellets and master batches are sent to the mixer, for example, air pressure, belt conveyers. Transportation by air, etc. Among them, air pressure feeding can be preferably used.
- ⁇ which is sent by air, for example, a feeder is installed downstream of the mixer.
- the mixture of natural pellets and masterbatch can be fed by setting the mixer to 3 ⁇ 4E. At this time, it is preferable to provide a filter at the outside air suction port of the weighing machine to prevent dust from being generated.
- the total amount of f and air is 40 kg / hour, and it takes about one hour. 270 kg of pellet mixture can be prepared.
- the coefficient is defined as: 100 g of a pellet mixture is extracted, separated into naturyl pellets and a master patch, and the calculation of the master batch is repeated 1 ° times. It is a value obtained from the average value and the standard difference p (s) according to the following equation.
- ⁇ modulus (%) (standard partial mean chain X 1 0 0
- the coefficient of the mixture of the natural pellets and the masterbatch is preferably 20 or less, more preferably 18 or less, and further preferably 15 or less.
- the mixer for example, a horizontal cylindrical mixer, a V-type mixer, a double circular mixer, a fiber rotary mixer, a glue rib mixer, a Nukayu paddle type Blender, 5 ⁇ mixer, free planetary mixer, conical screw mixer, high speed ⁇ mixer, rotating circle ⁇ mixer, wheeled mixer with roller, recirculating 55 mixer, high Speed elliptical rotor type mixer, air flow mixer, mixer etc.
- the airflow ⁇ mixer can be preferably used because it can be fed and mixed and discharged in a short time with the pellet mixture, which can be combined with the vacuum equipment. Mixing of the 3 kg 3 ⁇ 4g pellet mixture with the airflow ⁇ t3 ⁇ 4 mixer can be completed 20 seconds apart.
- the pellet mixture mixed in the mixing machine is provided in the talent tank.
- a single set of automatic weighing machine and machine can be used in common, and pellets and mixed products with different mixing ratios can be combined! ⁇ lffii "because you can.
- materials such as a box-shaped dry scythe and a box-shaped air flow dryer are used.
- the nitrogen atmosphere preferably has a nitrogen content of at least 93 m%, and more preferably has a nitrogen content of at least 97 #%.
- the resin pellets are slightly contained in the resin pellets, which act with nitrogen to prevent oxidative degradation during injection molding, and achieve a color tone and specific characteristics of ⁇ 1.
- the optical thickener include fine particles such as cross-linked polymethyl methacrylate, cross-linked polystyrene, cross-linked methyl styrene methacrylate copolymer, cross-linked silicone, and fluororesin, silica, silica monoalumina, anoremichi, and hydroxide.
- Inorganic fine particles such as aluminum, magnesium oxide, talc, glass flakes, glass beads, sodium silicate, canocarbonate, potassium carbonate, and titanium oxide can be fisted.
- thermoplastic resin used in the present invention is not particularly limited. Examples thereof include polymerized resin having an alicyclic ring, methacrylic resin, polycarbonate, polystyrene, acrylonitrile-styrene copolymer, methacrylo! ⁇ Methyl-styrene copolymer, and ABS resin. And Polyatenoles / Lejon. Among these, a methacrylic resin, a methylstyrene methacrylate copolymer, and a polymer having an alicyclic structure are preferred, and a polymer having an alicyclic structure is more preferably used. Can be.
- Polymerization having an alicyclic ring 3 ⁇ 4 As the shelf, a heavy chain having an alicyclic structure in a side chain can be mentioned. Polymerization with ⁇ ⁇ ⁇ in the main chain can be used particularly favorably because it has good visual jewelry and good quality.
- m ⁇ m Saturated ring is a prime structure
- the force is S
- the number of carbon atoms is preferably 4 to 30, more preferably 5 to 20 and still more preferably 5 to 15.
- Fatty acid Polymerization having 53 ⁇ 4 structure 3 ⁇ 4 The proportion of the repeating unit having an alicyclic structure in the fat is preferably 50% by weight or more, more preferably 70% by weight or more, and more preferably 90% by weight or more. More preferably, it is above.
- Polymerization having a lunar ring 53 ⁇ 4t ⁇ ⁇ As a shelf for example, norbornene, ring-opening polymerization of a monomer having a nucleus ⁇ 3 ⁇ 4 or a ring-opened copolymer or a hydrogen-excited product thereof, norbornene « ⁇
- a monomer polymer having a cyclic olefin structure or a hydrogenated polymer or an addition copolymer thereof or a hydrogenated product thereof, or a hydrogenated W product thereof or a monomer having a cyclic conjugated diene ⁇ t Polymers or copolymers of monomers having a hydrogenated ⁇ product, a butyl alicyclic compound, a hydrogenated ⁇ product or a hydrogen compound thereof, or a hydrogen compound having a hydrogen structure, and a unit having a vinylinocene compound.
- Tg is a glass car made of thermoplastic resin used. Difficult case
- the light diffusion plate is placed on a horizontal plate with the corners floating, and the amount of lifting at the four corners is measured, and the average value is defined as warpage.
- Luminance uniformity (%) (min maximal X 100
- the thickness unevenness of the obtained light ⁇ ⁇ ⁇ was 70 ⁇ m, the warpage was 0.5 mm, the power unevenness was 2.9%, and the variation of the y value of the 3 ⁇ 4f light was 0.001.
- Average brightness is 3,820 cd / m 2 , and the luminance uniformity was 80%.
- An optical fiber was formed in the same manner as in Example 1 except that the injection screw was replaced with a full flight screw having no mixing leak.
- the thickness unevenness of the obtained light spread was 90 ⁇ m, the warpage was 0.6 mm, the coefficient unevenness was 6.8%, and the variation of the y value of the reflected light was 0.003. Met.
- the average luminance was 3,790 cd / m 2 and the luminance; t ⁇ symmetry was 76%.
- the number of pinpoint gates was 4 in the arrangement shown in FIG. 13 except that a mold was used.
- the thickness unevenness of the obtained light spread was 1 ⁇ 0 ⁇ m, the warpage was 1.4 mm, the fii rate unevenness was 3.8%, and the variation in the y value of the Sit light was 0.0. 0 was one.
- the average luminance was 3,790 cdZm 2 and the luminance uniformity was 78%.
- the thickness unevenness of the obtained light captain was 160 ⁇ m, the warpage was 1.0 mm, the ⁇ 1 rate unevenness was 3.5%, and the variation of the y value of the light was 0. It was 0 2.
- the average luminance was 3,770 cd nom 2 and the luminance uniformity was 72%.
- a light spreading basket was formed in the same manner as in Example 1.
- the thickness unevenness of the obtained light spread was 90 ⁇ m, the warpage was 1.5 mm, the 3 ⁇ 41 rate unevenness was 7.2%, and the variation of the y value of 3 ⁇ 4f light was 0.003. there were.
- the average luminance was 3, 7 6 0 cd / m 2, the luminance uniformity ratio mediation 7 2%
- the thickness unevenness of the obtained light captain was 150 m, the warpage was 0.8 mm, the rate unevenness was 6.9%, and the variation of the y value of light was 0.000.
- the average luminance was 3,770 cd / m 2 and the ⁇ uniformity was 71%.
- the thickness unevenness of the obtained light-expanded light is 170 ⁇ m, the warpage is 1.5 mm, the power unevenness is 3.3%, and the variation of the y value of light is 0. It was 0 2.
- Polymerization pellets having a cycloaliphatic effect were produced by using metharyl (Nippon Kagaku Kabushiki Kaisha, Delpet 70) as a heat ⁇ -resin instead of extreme fat.
- Light was produced by injection molding in the same manner as in Example 1 except that the temperature was set at 80 ° C. and the mold temperature was set at 85 ° C.
- the thickness unevenness of the obtained light beam was 100 ⁇ m, the warpage was 0.9 mm, the 3 ⁇ 41 rate unevenness was 3.2%, and the variation of y value of 3 ⁇ 4T light was 0.0. 0 was 3.
- the average luminance was 3,690 cd dZm 2 and the luminance: t ⁇ symmetry was 71%.
- Example 1 Except for using a mold in which the area of the ejector space was 8% of the area of the cavity main surface, the light was transmitted in the same manner as in Example 1.
- the thickness unevenness of the obtained light spread was 50 ⁇ m, the warpage was 0.5 mm, the conversion unevenness was 2.9%, and the variation of the y value of the reflected light was 0.001.
- the average luminance was 3,810 cd / m 2 and the luminance; t-degree was 79%.
- the thickness unevenness of the obtained light spread was 240 m, the warpage was 2.5 mm, the 3 ⁇ 4i rate unevenness was 8.6%, and the variance of the y value of the 0f light was 0.005.
- the average luminance was 3, 5 5 0 c dZm 2 , the luminance uniformity ratio 6 5. /. Met.
- Fig. 19 is a cross-sectional view of the ejector space of the injection mold used in the examples and comparative examples when cut along a plane that is different from the main surface of the cavity, and a space portion of the ejector space. Is the ratio of the cross-sectional area to the area of the major surface of the cavity. In the figure, the position of the major surface of the cavity is indicated by single-point fiber.
- Table 1 shows the molding conditions of Difficult Examples 1 to 9 and Comparative Example 1, and Table 2 shows the results of consultation of the obtained light.
- the thickness unevenness is 200 ⁇ or less
- the warpage is 2 mm or less
- the ⁇ rate unevenness is 8% or less
- the variation in the y value of the ⁇ lt light is 0.0.
- a light source can be diffused to produce a light source with a high luminance and a small luminance unevenness. Display of image quality ⁇ can be obtained.
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05720978A EP1731929A1 (en) | 2004-03-12 | 2005-03-10 | Light diffusion plate and method for producing the plate |
US10/592,229 US20070200263A1 (en) | 2004-03-12 | 2005-03-10 | Light Diffusion Plate And Process For Producing The Plate |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004069940A JP4466137B2 (ja) | 2004-03-12 | 2004-03-12 | 光拡散板 |
JP2004-069940 | 2004-03-12 | ||
JP2004-107269 | 2004-03-31 | ||
JP2004107269A JP2005288887A (ja) | 2004-03-31 | 2004-03-31 | 光学用成形体の製造方法 |
Publications (1)
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WO2005088358A1 true WO2005088358A1 (ja) | 2005-09-22 |
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ID=34975725
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PCT/JP2005/004743 WO2005088358A1 (ja) | 2004-03-12 | 2005-03-10 | 光拡散板及びその製造方法 |
Country Status (5)
Country | Link |
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US (1) | US20070200263A1 (ja) |
EP (1) | EP1731929A1 (ja) |
KR (1) | KR20070015399A (ja) |
TW (1) | TW200532263A (ja) |
WO (1) | WO2005088358A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007094209A1 (ja) * | 2006-02-13 | 2007-08-23 | Zeon Corporation | 平板成形品の製造方法および平板成形品 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US20080153008A1 (en) * | 2004-02-18 | 2008-06-26 | Masahiko Hayashi | Optical Element, Method for Production Thereof and Display Device |
KR101330382B1 (ko) | 2006-11-30 | 2013-11-15 | 엘지디스플레이 주식회사 | 액정표시장치와 그 제조방법 |
EP2633973B1 (en) * | 2010-10-29 | 2017-06-21 | Mitsubishi Heavy Industries Plastic Technology Co., Ltd. | Plasticizing screw for injection molding and injection molding method |
KR101980734B1 (ko) * | 2017-07-28 | 2019-05-21 | 세원정공 주식회사 | 청색 led용 단일층 구조의 형광확산판 및 그 제조방법 |
JP7050562B2 (ja) * | 2018-04-19 | 2022-04-08 | 東洋機械金属株式会社 | スクリューヘッド、スクリューおよび射出成形機 |
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US2755508A (en) * | 1952-05-26 | 1956-07-24 | Maccaferri Mario | Mold apparatus for tiles and other plate-like structures |
US6295104B1 (en) * | 1998-05-26 | 2001-09-25 | Minebea Co., Ltd. | Front illuminating system with layer between light guide and LCD |
DE60036578T2 (de) * | 1999-06-25 | 2008-07-03 | Sumika Color Co. Ltd. | Verfahren und Vorrichtung zum Herstellen von Mehrschichtgranulaten |
JP2001131419A (ja) * | 1999-11-05 | 2001-05-15 | Nippon Zeon Co Ltd | 光拡散性組成物 |
TW538260B (en) * | 2000-04-28 | 2003-06-21 | Sumitomo Chemical Co | Method for producing light transmitting plate |
JP2002303734A (ja) * | 2001-04-05 | 2002-10-18 | Sumitomo Chem Co Ltd | 導光板 |
JP4675666B2 (ja) * | 2005-04-15 | 2011-04-27 | 株式会社東芝 | 電子機器 |
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2005
- 2005-03-10 US US10/592,229 patent/US20070200263A1/en not_active Abandoned
- 2005-03-10 KR KR1020067021131A patent/KR20070015399A/ko not_active Application Discontinuation
- 2005-03-10 WO PCT/JP2005/004743 patent/WO2005088358A1/ja active Application Filing
- 2005-03-10 EP EP05720978A patent/EP1731929A1/en not_active Withdrawn
- 2005-03-10 TW TW094107265A patent/TW200532263A/zh unknown
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KR20070015399A (ko) | 2007-02-02 |
US20070200263A1 (en) | 2007-08-30 |
TW200532263A (en) | 2005-10-01 |
EP1731929A1 (en) | 2006-12-13 |
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