KR100951700B1 - Manufacturing method of light modulated object - Google Patents

Abstract

PURPOSE: In a manufacturing method of an optical modulation object is the Central part of the suede, the area of the optical modulation interface is maximized by preventing the generation of the agglomeration phenomenon of the drawing part. CONSTITUTION: The manufacturing method of the optical modulation object comprises a process of arranging inside matrix the birefringence suede. The birefringence suede comprises the drawing part arranged around radiation cores(51, 52, 53, 54) more than 2. The drawing part is formed into the sectioned group. It smalls than the maximum value of spacing between adjacent drawing parts between the group in which the maximum value of spacing between adjacent drawing parts of the same group inside is each other neighbors. The radiation core comprises at the center of the birefringence suede located one radiation standards core and an plurality of around the radiation cores arranged around the radiation standards core.

Description

Manufacturing method of light modulated object

The present invention relates to a method for manufacturing an optical modulation object, and more particularly, to manufacture an optical modulation object having a significantly lower production cost while significantly reducing the production cost, including birefringent islands with two or more radiation cores in a matrix. It is about a method.

Light modulation object may be distributed within the continuous matrix mixed water are known in the art as being composed of (混在物, inclusion), a wide range of the light modulating various optical devices requiring, a liquid crystal display. The characteristics of the mixture can be manipulated to provide a range of reflectivity and transmittance to the light modulating object. Such features include the size of the mixture with respect to the wavelength in the object, the shape and arrangement of the mixture, the volume fraction of the mixture and the refractive index mismatch with the continuous matrix (matrix) along the three orthogonal axes of the object.

Conventional absorbing polarizers comprise inorganic rod-shaped chains of light absorbing iodine arranged in a polymer matrix on their mixture. Such films tend to absorb light polarized according to their electric field vectors aligned parallel to the rod-shaped iodine chains, thereby transmitting light polarized perpendicular to the rods. Since the iodine chain has two or more dimensions smaller than the wavelength of visible light and the number of chains per cubic wavelength of light is large, the optical properties of the light modulator are mainly specular, and are diffusely transmitted through the light modulator or Diffuse reflections from the surface of the light modulation object are very minimal. Like most other commercially available light modulation objects, such light modulation objects are based on the selective absorption and reflection of polarized light.

Light modulated objects filled with inorganic mixtures having various properties can provide different optical transmission and reflectivity. For example, coated mica flakes having two or more dimensions relative to the wavelength of the visible region are incorporated into the polymer film and the paint to impart metallic luster. By manipulating the flakes to be in the film plane, it is possible to provide strong direction dependence on the reflection aspect.

Such effects can be used to produce safety screens that are reflective for certain viewing angles and that are transparent at other viewing angles. Large flakes with coloration (selective specular reflection) depending on the alignment of the incident light may be incorporated into the film to provide evidence of tampering. In this application, all the flakes in the film need to be similarly aligned with respect to each other.

However, optical films made from polymers filled with inorganic blends have several disadvantages. Typically, the adhesion between the inorganic particles and the polymer matrix is poor. Thus, the optical properties of the light modulator are reduced when stress or strain is applied across the matrix, since the bond between the matrix and the blend is impaired and the rigid inorganic blend may rupture. In addition, in order to align the inorganic mixture, further consideration is required in the processing step, which makes the manufacturing method complicated.

However, more fundamentally, since the optical properties of the matrix constituting the conventional light modulation object and the optical properties of the mixture inserted into the matrix are optically isotropic, there is a problem that the efficiency of light modulation is inferior. Accordingly, when the birefringent fibers are disposed in the matrix, the light incident from the light source may be reflected , scattered, and refracted at the birefringent interface, which is an interface between the birefringent fibers and the isotropic matrix , thereby generating light modulation to improve luminance. However, the use of general birefringent fibers has the advantages of low production cost and high light modulation efficiency. However, the effect of the target brightness enhancement is still insignificant. There was a difficult problem.

The present invention has been made to solve the above-described problems of the prior art, the first problem to be solved by the present invention is to prevent the agglomeration of the light portion including a birefringent islands designed to maximize the light modulation effect It is to provide a method of manufacturing a modulated object.

The present invention to achieve the first object,

In the method of manufacturing an optical modulator according to the present invention, a group is formed in a matrix with two or more radiating cores arranged to form a partitioned group, but the maximum value of the center distance between adjacent islands within the same group is adjacent to each other. Arranging birefringent islands less than the maximum value of the center distance between adjacent islands therebetween.

According to a preferred embodiment of the present invention, the radiation core has a single radiation reference core is located in the center of the island, and a plurality of radiation peripheral core may be arranged around it, preferably the radiation reference core and a plurality of radiation The separation distance between the peripheral cores may be substantially the same, or the plurality of radiation peripheral cores may be substantially the same at each separation distance.

According to another preferred embodiment of the present invention, the spinning peripheral core is 3 to 20, more preferably the spinning peripheral core may be 6 to 10.

According to another preferred embodiment of the present invention, 10 to 300 islands may be arranged with respect to the one radiation reference core or one radiation peripheral core.

According to still another preferred embodiment of the present invention, the total number of the conductive parts may be 50 to 1500, more preferably, the total number of the conductive parts may be 500 to 1500, and most preferably, the total conductive parts The number of may be 1000 to 1500.

According to another preferred embodiment of the present invention, the longitudinal cross-sectional shape of the islands grouped around the radiation core may be aligned in a circle or polygon, in which case the islands grouped around the radiation core. The cross-sectional shape in the longitudinal direction may be identical or different.

According to another preferred embodiment of the present invention, the spinning core may be arranged based on the center of the island-in-the-sea yarn, and more preferably, the spinning core may not be formed in the center of the island-in-the-sea yarn.

According to another preferred embodiment of the present invention, the number of the spinning core may be 3 to 20, more preferably 6 to 10.

According to another preferred embodiment of the present invention, the single yarn fineness of the island-in-the-sea yarn may be 0.5 to 30 denier, and the single yarn fineness of the island portion of the island-in-the-sea yarn may be 0.0001 to 1.0 denier.

According to another preferred embodiment of the present invention, a birefringent interface may be formed inside the birefringent island-in-the-sea yarn, and more preferably, the island portion may be anisotropic and the sea portion may be isotropic.

According to another preferred embodiment of the present invention, the island portion is polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC ) Alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene ( ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM) Or phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer.

According to another preferred embodiment of the present invention, the sea portion is polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) Alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS ), Polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), It may be one or more of phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer.

According to another preferred embodiment of the present invention, the matrix may be isotropic.

According to another preferred embodiment of the present invention, the refractive index of the matrix and the birefringent solution yarns may have a difference in refractive index between two axial directions of 0.03 or less and a difference in refractive index for the other one axial direction of 0.05 or more. .

According to another preferred embodiment of the present invention, the refractive index in the x-axis direction of the matrix is nX1, the refractive index in the y-axis direction is nY1 and the refractive index in the z-axis direction is nZ1, the refractive index of the birefringent island-in-the-sea yarn is nX2, nY2 and nZ2 In this case, at least one of the X, Y, and Z-axis refractive indices of the matrix and the birefringent island-in-the-sea yarn may coincide, and the refractive index of the birefringent island-in-the-sea yarn may be nX2> nY2 = nZ2.

According to another preferred embodiment of the present invention, the refractive index of the sea portion and the island portion of the birefringent island-in-the-sea yarn is less than 0.03 difference in the two axial directions, the difference in refractive index in the other one axial direction is 0.05 or more Can be.

According to still another preferred embodiment of the present invention, the refractive index in the x-axis direction in the longitudinal direction of the island portion of the birefringent island-in-the-sea yarn is nX3, the refractive index in the y-axis direction is nY3 and the refractive index in the z-axis direction is nZ3, When the refractive index of the x-axis direction is nX4, the y-axis direction of the refractive index nY4, and the z-axis direction of the refractive index is nZ4, at least one of the matrix, the birefringent islands of the X, Y, Z-axis refractive index may be the same, The absolute value of the difference between the refractive indices of nX3 and nX4 may be 0.05 or more.

According to another preferred embodiment of the present invention, the refractive index of the sea portion of the island-in-the-sea yarn may match the refractive index of the matrix.

According to another preferred embodiment of the present invention, the area ratio of the sea portion and the island portion based on the cross-section of the birefringent island-in-the-sea yarn may be 2: 8 ~ 8: 2:

According to another preferred embodiment of the present invention, the birefringent island-in-the-sea yarn may be used to extend in the longitudinal direction.

According to another preferred embodiment of the present invention, the light modulating object may have a structured surface.

According to another preferred embodiment of the present invention, the birefringent island-in-the-sea yarn may be a fabric, and the fabric may be woven using the birefringent island-in-the-sea yarn using at least one of weft and warp yarns, and any one of the weft and warp yarns Is the island-in-the-sea yarn, and the other may be isotropic fiber.

According to another preferred embodiment of the present invention, the weft yarn or warp yarn may be formed by gathering 1 ~ 200 strands.

The terms used herein are briefly described.

Unless otherwise stated, the term 'spinning core' refers to the point where the island parts in the cross section are grouped and arranged around a certain point inside the island (when partitioned) when cutting the island in the longitudinal direction. It means.

The term 'radiation reference core' refers to a radiation core which is a center when a plurality of radiation cores exist and the other radiation cores are arranged around one radiation core, and the 'radiation peripheral core' refers to one radiation core. It means the remaining spinning core to be arranged.

'Doing parts are grouped and arranged' means that the island parts of the islands and islands are partitioned and aligned with a certain shape around one spinning core. For example, when there are two spinning cores inside the islands Since the island-in-the-sea yarn is arranged in a uniform shape around each spinning core, the island part is divided into two groups within the island-in-the-sea yarn.

'Fiber has birefringence' means that when light is irradiated on a fiber having a different refractive index according to the direction, the light incident on the polymer is refracted by two lights having different directions.

'Isotropic' means that when light passes through an object, the refractive index is constant regardless of the direction.

'Anisotropy' means that the optical properties of an object are different depending on the direction of light. Anisotropic objects have birefringence and correspond to isotropy.

'Light modulation' means that the irradiated light is reflected, refracted, scattered, or the intensity of the light, the period of the wave, or the nature of the light is changed.

Since the optical modulation object manufactured by the manufacturing method of the present invention includes birefringent islands in which island portions are grouped and arranged around two or more radiating cores, an optical modulation interface is formed at the interface between the island portion and the sea portion, thereby providing general birefringence. It can maximize the light modulation effect compared to the fiber. In particular, even when the number of birefringent islands in the present invention is 500 or more, the agglomeration of the islands (conjugation phenomenon) does not occur in the central portion of the islands. As a result, the area of the light modulation interface can be maximized as compared with the conventional islands-in-the-sea yarn having one spinning core, so that the light modulation effect is significantly increased. Therefore, the brightness is remarkably improved as compared with the case of using a conventional birefringent solution yarn having only a birefringent fiber or a single spinning core inside a normal sheet.

Hereinafter, the present invention will be described in more detail.

Conventional light modulation objects have a problem in that the efficiency of light modulation is inferior because the optical properties of the matrix constituting it and the optical properties of the mixtures inserted into the matrix are optically isotropic. Accordingly, when the birefringent fibers are disposed in the matrix, the light incident from the light source may be reflected , scattered, and refracted at the birefringent interface, which is an interface between the birefringent fibers and the isotropic matrix , thereby generating light modulation to improve luminance. However, the use of general birefringent fibers has the advantages of low production cost and high light modulation efficiency. However, the effect of the target brightness enhancement is still insignificant. There was a difficult problem.

The birefringent island-in-the-sea yarn was used as the birefringent fiber having the birefringent interface, thereby overcoming the above problems. Specifically, when the birefringent island-in-the-sea yarns were used, it was confirmed that the effects of light modulation efficiency and luminance improvement were remarkably improved compared with the case of using the conventional birefringent fibers. The seam portion constituting the island-in-the-sea yarn has anisotropy, and the sea portion partitioning the seam portion has isotropy. In this case, not only the interface between the islands and seams but also the interface between the islands and sea portions forming the inside of the islands also have a birefringent interface, so that the birefringence interface is generated only at the interface between the matrix and the birefringent fibers. The optical modulation effect is significantly increased compared to the fiber and can be applied to the actual industrial site by replacing the laminated optical modulation object. Therefore, the use of birefringent island-in-the-sea yarns is superior to the use of conventional birefringent fibers, and the optical modulation efficiency is excellent. That is, the light modulation efficiency can be remarkably improved as compared to the case where it is not possible.

On the other hand, in order to maximize the light modulation efficiency, the larger the area of the birefringent interface in the birefringent islands, the greater the advantage, for this purpose, the number of islands in the birefringent islands should be larger. However, the conventional islands and islands are arranged concentrically around a single spinning core inside the islands, and the structure of such a cross section is fine when the number of the islands is small, but when the number of islands increases (about 300 or more), in the case of the island portion adjacent to the spinning core formed in the center of the island, the density becomes large, and the phenomenon of agglomeration (conjugation phenomenon) occurs in the portion of the coating located around the spinning core during the spinning process. More specifically, FIGS. 2A and 2B are cross-sectional views of the conventional islands of the sea island (Fig. 331), and Fig. 2A shows concave portions 22 arranged concentrically around a single spinning core 21 inside the island. The cross-sectional area of the island portion in the total sea island cross section is 60 to 70%. FIG. 2B also shows that the concave portion 24 is arranged concentrically around a single spinning core 23 in the island-in-the-sea yarn, and the cross-sectional area of the island-in-the-sea yarn is 70 to 80%. This cross-sectional structure does not have an abnormality when the number of drawing parts is small, but when the number of drawing parts is increased (about 300 or more), the ratio of the cross-sectional area of the drawing part of the drawing yarn becomes high, which is formed at the center of the drawing island. In the case of the proximal portion adjacent to the spinning core 21, the density becomes large, and a phenomenon of agglomeration between the protruding portions positioned around the spinning core occurs in the spinning process. In other words, as the number of islands of islands in the sea island increases, there is a side effect (conjugation phenomenon) in which the island parts of the islands of the islands agglomerate to form a mass.

Therefore, the birefringent island-in-the-sea yarn having a cross-sectional shape of a conventional island-in-the-sea yarn has a problem in that the birefringence interface is reduced due to the degree of conduction.

Accordingly, in the method of manufacturing an optical modulator according to an embodiment of the present invention, the inner parts of the matrix are arranged around two or more radiating cores to form a partitioned group, but the center distance between adjacent inner parts within the same group is defined. The above problem has been sought, including the step of placing a birefringent island-in-the-sea yarn whose maximum value is smaller than the maximum value of the center distance between adjacent islands between adjacent groups. This prevented the excessive integration of the dorsal portion in one radiating core to prevent the occurrence of conjugation. As a result, it was confirmed that the light modulation efficiency and the brightness was remarkably improved.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

3 is a schematic diagram of a cross section of a light modulating object of the present invention. Specifically, in the optical modulation object, the island-in-the-sea yarn 32 having birefringence is freely arranged in the matrix 31 having isotropy. The matrix 31 that can be used at this time may include a thermoplastic and thermosetting polymer that transmits a light wavelength in a desired range, and may be a transparent material that is easy to transmit light. Desirably, the suitable matrix 31 may be amorphous or semicrystalline and may comprise a homopolymer, copolymer or blend thereof. Specifically poly (carbonate) (PC); Syndiotactic and isotactic poly (styrene) (PS); Alkyl styrenes; Alkyl, aromatic and aliphatic ring containing (meth) acrylates including poly (methylmethacrylate) (PMMA) and PMMA copolymers; Ethoxylated and propoxylated (meth) acrylates; Polyfunctional (meth) acrylates; Acrylated epoxy; Epoxy; And other ethylenically unsaturated substances; Cyclic olefins and cyclic olefin copolymers; Acrylonitrile butadiene styrene (ABS); Styrene acrylonitrile copolymer (SAN); Epoxy; Poly (vinylcyclohexane); PMMA / poly (vinylfluoride) blends; Poly (phenylene oxide) alloys; Styrene block copolymers; Polyimide; Polysulfones; Poly (vinyl chloride); Poly (dimethylsiloxane) (PDMS); Polyurethane; Unsaturated polyesters; Polyethylene; Poly (propylene) (PP); Poly (alkane terephthalates) such as poly (ethylene terephthalate) (PET); Poly (alkane naphthalate) such as poly (ethylene naphthalate) (PEN); Polyamides; Ionomers; Vinyl acetate / polyethylene copolymers; Cellulose acetate; Cellulose acetate butyrate; Fluoropolymers; Poly (styrene) -poly (ethylene) copolymers; PET and PEN copolymers, including polyolefin PET and PEN; And poly (carbonate) / aliphatic PET blends. More preferably, polyethylene naphthalate (PEN), polyethylene naphthalate copolymer (co-PEN) polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), urea. (UF.MF), Unsaturated polyester (UP), Silicone (SI), Elastomer, Cycloolefin polymer (COP, Japan ZEON, JSR) can be used alone or in combination, more preferably birefringence The same component as the sea part of the yarn 31 can be used. Furthermore, the substrate may contain additives such as antioxidants, light stabilizers, heat stabilizers, lubricants, dispersants, ultraviolet absorbers, white pigments, fluorescent whitening agents, and the like, as long as the above properties are not impaired.

Next, the birefringent island-in-the-sea yarn 31 included in the matrix 31 will be described. As described above, the conventional islands and islands are arranged concentrically around a single spinning core inside the islands and seams in the cross-sectional structure is no abnormal when the number of the portion is small, but the number of the portion is large When it loses (about 300 or more), the density of the island portion adjacent to the spinning core formed in the center of the island is increased, the condensation occurs in the portion of the portion located around the spinning core during the spinning process. In other words, as the number of islands of islands in the sea island increases, the islands in the center portion of the islands agglomerate to form agglomerates. Therefore, when this is used in an optical modulation object, the birefringence interface decreases, thereby limiting the improvement of the light modulation effect.

Accordingly, in the island-in-the-sea island comprising a plurality of islands and sea portions surrounding the birefringent islands according to an embodiment of the present invention, the islands are grouped and arranged around two or more spinning cores. I solved the problem. This prevented excessive integration of the drawing parts in one spinning core.

FIG. 4 is a birefringent island-in-the-sea yarn according to a preferred embodiment of the present invention, and two spinning cores 41 and 42 are formed inside the island-in-the-sea yarn 40 and the center portion 43 is formed around the spinning cores 41 and 42. , 44) are grouped and arranged. In other words, the convex parts 43 and 44 are arranged around the respective radiating cores 41 and 42 so that the cross section is divided by the number of the radiating cores. In this case, there is no restriction in the kind of cross-sectional shape of semi-circular, sector, circular, elliptical, polygonal and heteromorphic cross section of each group of the conductive parts 43 and 44 arranged around the radiating cores 41 and 42. The shape may be the same or different. For example, FIG. 5 illustrates a case in which four spinning cores 51, 52, 53, and 54 exist inside the island-in-the-sea yarn 50, and the arrangement shapes 55, 56, 57, and 58 of respective islands are illustrated. Are all fan-shaped, but some of the arrangements of the drawing parts may be triangles, squares, or circles that are not fan-shaped. On the other hand, in the drawings of the present disclosure, the radiation core is shown in bold as a black point, but this is only an expression for clearly showing the radiation core, which means a point that is the center of the actual group, the point is even part It can be or it can be a solution. Furthermore, the blanks inside the islands may actually be filled with islands or only sea parts. On the other hand, as can be seen in Figure 5 the birefringent islands of the present invention the maximum value of the center distance between adjacent islands in the same group is smaller than the maximum value of the center distance between adjacent islands between adjacent (adjacent) groups. In other words, since the birefringent islands in the present invention do not have a constant distance between the adjacent groups formed therebetween, the distance between the adjacent islands (center distance between adjacent islands belonging to different groups) The longest part of the center distance is larger than the maximum value of the center distance between adjacent islands within the same group.

On the other hand, the number of islands arranged in the birefringent islands of the present invention may be 38 to 1500, more preferably the total number of islands may be 500 to 1500, and to properly control the number of spinning cores In this case, most preferably, the total number of conductive parts may be 1000 to 1500. Further, 10 to 300 degrees may be arranged with respect to the one spinning core, and more preferably 100 to 150 degrees may be arranged, but is not limited thereto. As a result, the number of islands arranged around the one radiation core described above maximizes island islands and islands, island microfibers, and desired microfibers, and light modulation efficiency to be described later, within a range where aggregation of islands does not occur. It can be adjusted as appropriate within the range possible.

According to one preferred embodiment of the present invention, the radiation core may be one radiation reference core is located in the center of the island, the plurality of radiation peripheral cores may be arranged around it. In detail, FIG. 6 illustrates an example of a birefringent island-in-the-sea yarn according to a preferred embodiment of the present invention, in which one radiation reference core 61 is formed at the center of the island-in-the-sea yarn 60, and the center of the radiation reference core 61 is 7. Four radiation peripheral cores 62 to 68 are formed. In this case, preferably, the separation distance between the radiation reference core 61 and the plurality of radiation peripheral cores 62 to 68 may substantially coincide or not coincide. Substantially coinciding the separation distance between the core 61 and the plurality of radiation peripheral cores 62 to 68 is effective to minimize the effect of the aggregation of the islands. On the other hand, when the cross-sectional shape is elliptical, the radiation reference core 61 such that the distance between the radiation reference core 61 and the plurality of radiation peripheral cores 62 to 68 is long in the long axis direction and short in the short axis direction of the ellipse. ) And a plurality of radial peripheral cores (62 to 68) may be formed.

On the other hand, the number of the radiation peripheral core is preferably 3 to 20 may be formed, more preferably 6 to 10 may be formed, as shown in Figure 6 arranged based on one radiation reference core 61 The effect is most effective when the number of the radially peripheral cores 62 to 68 is 6 to 8, and the number of the doped parts grouped to the radial reference core 61 and the radial peripheral cores 62 to 68 is 100 to 200. Excellent (Table 1).

According to a second preferred embodiment of the present invention, the spinning core may be arranged based on the center of the island-in-the-sea yarn, and more preferably, the spinning core may not be formed in the center of the island-in-the-sea yarn. In the following, only characteristic parts of the above two embodiments will be described except for overlapping matrices. Specifically, Figure 7 is an example of the birefringent islands in accordance with the preferred embodiment 2 of the present invention, the radiation core (72, 73, 74, 75) is arranged on the basis of the center 71 of the islands of the islands, the center of the island 71, no spin core is formed. 8 shows three spinning cores 82, 83, 84 based on the center 81 of the island-in-the-sea yarn, and eight spinning cores 85, 86 on the outside of the three spinning cores 82, 83, 84. , 87, 88, 89, 90, 91, 92). At this time, three spinning cores 82, 83, 84 formed therein and eight spinning cores 85, 86, 87, 88, 89 formed outside of the three spinning cores 82, 83, 84. , 90, 91, 92 are all arranged with respect to the center 81 of the island-in-the-sea yarn. In this case, the number of the spinning cores is preferably 3 to 20, more preferably 6 to 10, but is not limited thereto.

On the other hand, the fineness of the group type island-in-the-sea yarn used in the present invention satisfies the single yarn fineness of a conventional island-in-the-sea yarn, but preferably may have a single yarn fineness of 0.5 to 30 deniers. The single yarn fineness of the island portion of the island-in-the-sea yarn is 0.0001 to 1.0 denier is advantageous to achieve the object of the invention.

The birefringent island-in-the-sea yarn according to another embodiment of the present invention may have different optical characteristics of the island portion and the sea portion in order to maximize the light modulation efficiency. More preferably, the island portion is anisotropic and the sea portion is isotropic. Can be.

Specifically, in an island-in-the-sea island comprising an optically isotropic sea portion and an island portion having anisotropy, the magnitude of the substantial coincidence or mismatch of the refractive indices along the X, Y, and Z axes in space affects the degree of scattering of the polarized light along the axis. Crazy In general, the scattering power varies in proportion to the square of the refractive index mismatch. Thus, the greater the degree of mismatch in refractive index along a particular axis, the more strongly scattered light polarized along that axis. Conversely, when the mismatch along a particular axis is small, the light polarized along that axis is scattered to a lesser extent. If the refractive index of the sea portion along a certain axis substantially coincides with the refractive index of the island portion, the incident light polarized by an electric field parallel to this axis will not be scattered regardless of the size, shape, and density of the portion of the island. Will pass. Also, when the refractive indices along that axis are substantially coincident, the light beam passes through the object without being substantially scattered. More specifically, FIG. 9 is a cross-sectional view showing a path of light transmitted through the birefringent island-in-the-sea yarn of the present invention. In this case, the P wave (solid line) is transmitted without being affected by the interface between the birefringent island-in-the-sea yarn and the interface between the seam and the sea inside the birefringent island-in-the-sea yarn, but the S-wave (dotted line) is the matrix and the birefringence The modulation of light occurs due to the influence of the birefringent interface between the seam boundary and / or the birefringent islands inside the island and sea.

The above-mentioned light modulation phenomenon at the birefringent interface mainly occurs at the interface between the matrix and the birefringent islands and inside the birefringent islands. Specifically, in the case where the optical property of the matrix is isotropic, light modulation occurs at the interface between the matrix and the birefringent island-in-the-sea yarns similarly to ordinary birefringent fibers. Specifically, the refractive index of the matrix and the birefringent island-in-the-sea yarn may have a difference in refractive index between two axial directions of 0.03 or less, and a difference in refractive index for one remaining axial direction may be 0.05 or more. More specifically, the matrix and the birefringence when the refractive index in the x-axis direction of the matrix is nX1, the refractive index in the y-axis direction is nY1 and the refractive index in the z-axis direction is nZ1, and the refractive indexes of the birefringent island-in-the-sea yarn are nX2, nY2 and nZ2 At least one of the X, Y, and Z-axis refractive indices of the island-in-the-sea yarn may coincide, and the refractive index of the birefringent island-in-the-sea yarn may be nX2> nY2 = nZ2.

On the other hand, in the present invention, the optical quality of the island portion and the sea portion of the birefringent island-in-the-sea yarn is advantageous to create a birefringent interface. Specifically, when the island portion is anisotropic and the sea portion is isotropic, a birefringence interface may be formed at the interface between the island portion and the sea portion, and more preferably, the refractive index is 0.03 or less in the difference between the refractive indices of the two axial directions and the rest. It is preferable that the difference in refractive index with respect to one axial direction is 0.05 or more. In this case, P wave passes through the birefringent interface of island-in-the-sea yarn, but S wave can cause light modulation. In more detail, the refractive index in the x-axis direction in the longitudinal direction of the island portion of the birefringent island-in-the-sea yarn is nX3, the refractive index in the y-axis direction is nY3 and the refractive index in the z-axis direction is nZ3, and the refractive index in the x-axis direction of the sea portion When the refractive index in the nX4 and y-axis directions is nY4 and the refractive index in the z-axis direction is nZ4, at least one of the X, Y, and Z-axis refractive indices of the matrix and the birefringent island-in-the-sea yarns may coincide, and the refractive indices of the nX3 and nX4 The absolute value of the difference of may be 0.05 or more. Most preferably, the difference in refractive index in the longitudinal direction of the sea portion and the island portion of the island-in-the-sea yarn is 0.1 or more, and the optical modulation efficiency may be maximized when the refractive indices of the sea portion and the island portion in the remaining two axial directions substantially coincide. have. On the other hand, it is advantageous to increase the light modulation efficiency when the refractive index of the sea portion of the matrix and the birefringent islands.

As a result, in order to maximize the light modulation efficiency of the island-in-the-sea yarn as described above, the optical properties of the island portion and the sea portion should be different, and the area of the light modulation interface should be wide. For this purpose, the number of the drawing parts should be large, and preferably, the number of drawing parts should exceed 500. However, even when the refractive index of the island portion is anisotropic and the refractive index of the sea portion is arranged isotropically in the conventional islands and islands, when the number of the island portions exceeds 500, the island portion is agglomerated, and the area of the optical modulation interface is reduced and the light is reduced. There is a fatal problem of poor modulation efficiency. Thus, in the present invention, when two or more spinning cores are formed as described above, even when 500 or more, preferably 1000 or more islands are disposed, the phenomenon of bunching of islands can be prevented. As a result, the optical modulation efficiency of the island-in-the-sea yarn is maximized, and when the birefringent island-in-the-sea yarn according to the embodiment of the present invention is added to the light modulation object and the light modulation object to be described later, a significant improvement in light modulation effect and luminance can be expected.

The sea portion and / or island portion, which may be used in the present invention, are polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC ) Alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene ( ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM) Or phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer. Preferably, the material and the sea portion have a substantially identical refractive index in two axial directions, but selecting a material having a large difference in refractive index in one axial direction is effective to improve the light modulation efficiency. For example, when birefringent island-in-the-sea yarn 31 is used as the island portion, polyethylene naphthalate (PEN) is used as the island portion, and when copolyethylene naphthalate and the polycarbonate alloy are used alone or as a sea portion, The luminance is remarkably improved as compared to the birefringent island-in-the-sea yarn set out in Article 3. In particular, when the polycarbonate alloy (alloy) is used as the sea portion, it is possible to produce a birefringent island-in-the-sea yarn having the best optical modulation properties. In this case, the polycarbonate alloy is preferably made of polycarbonate and modified glycol polycyclohexylene dimethylene terephthalate (PCTG), and more preferably polycarbonate and modified glycol poly Cyclohexylene dimethylene terephthalate (PCTG) is a polycarbonate alloy consisting of a weight ratio of 2: 8 to 8: 2: It is effective to increase the brightness. The use of polycarbonate alloys in a weight ratio of 15: 85 to 85: 15 is effective for brightness enhancement. If the polycarbonate is added less than 15%, the viscosity of the polymer required to secure the radioactivity is high, and the ordinary spinning machine cannot be used. If the polycarbonate is more than 85%, the glass transition temperature increases, and after the nozzle discharge, the radiation tension increases to secure radioactivity. Has a difficult problem.

Most preferably, the polycarbonate and the modified glycol polycyclohexylene dimethylene terephthalate (PCTG) in a weight ratio of 4: 6 to 6: 4 exhibit the best effect on brightness enhancement. Furthermore, it is effective to improve the light modulation efficiency by selecting a material in which the refractive index in the two axial directions is substantially the same, but the difference in the refractive index in the one axial direction is large.

On the other hand, a method for changing an isotropic material to birefringence is commonly known and, for example, when drawn under suitable temperature conditions, the polymer molecules are oriented so that the material becomes birefringent.

Preferably, the material and the sea portion have substantially the same refractive index in two axial directions, but selecting a material having a large difference in refractive index in one axial direction is effective to improve the light modulation efficiency.

Meanwhile, when the birefringent island-in-the-sea yarn is described, specifically, the matrix may be disposed in the form of yarn or in the form of a fabric. First, when the birefringent island-in-the-sea yarn is disposed in the form of yarn in the matrix, a plurality of the islands may be arranged to extend in one direction, and more preferably, the island-in-the-sea island may be disposed in the matrix perpendicular to the light source. In this case, the light modulation efficiency is maximized. On the other hand, the island-in-the-sea islands arranged in a line may be arranged to be distributed with each other as needed, or may be in contact with each other between the islands and islands, and when the islands are in contact with each other between the islands and islands may be arranged in a dense layer.

For example, if three or more kinds of cross-sectional islands of different diameters are arranged in a circular island, the triangles obtained by connecting the centers of three circles which are in contact with each other in a cross section perpendicular to the major axis direction become an isosceles triangle. . In addition, in the cross section perpendicular to the long axis direction of the island-in-the-sea yarn (cylindrical body), the circle on the first layer and the circle on the second layer are in contact with each other, and the circle on the second layer and the circle on the third layer are also in contact with each other. The cylindrical bodies are arranged so as to be in contact with each other, but for each island-in-the-sea yarn, it is sufficient to satisfy the condition of "contacting each other with at least two other sea islands which are in contact with each other on the side of the cylinder." In this range, for example, the circle on the first layer and the circle on the second layer are contacted, the circle on the second layer and the circle on the third layer are separated through a supporting medium, and the circle on the third layer and the circle on the fourth layer are contacted again. It is also possible to take the composition.

The triangle connecting the centers of the three circles directly contacting each other in the cross section perpendicular to the long axis direction of the island-in-the-sea yarn is preferably at least two sides having substantially the same length, and in particular, the triangle has three sides having approximately the same length. desirable. In the lamination state of the island-in-the-sea yarn in the thickness direction of the light modulating object, it is preferable that a plurality of layers are sequentially stacked so as to be in contact with each other, and more preferably, an island-in-the-sea yarn made of a cylinder having substantially the same diameter is densely packed. Do.

Therefore, in such a more preferable aspect, the plurality of sea islands are cylindrical bodies each having substantially the same diameter in the cross section perpendicular to the major axis direction, and the islands and islands located inside the outermost surface layer in the cross section are six different It is in contact with the cylinder chain islands and cylinders.

Meanwhile, the birefringent island-in-the-sea yarn may be disposed in the form of a fabric in the substrate as shown in FIG. 10. In this case, the present invention provides a fabric comprising the birefringent island-in-the-sea yarn of the present invention as weft and / or warp yarn, and most preferably, the birefringent island-in-the-sea yarn of the present invention is used as the weft or warp yarn and the isotropic fibers are used as the remaining weft or warp yarn. Do. Preferably, the weft or warp yarn may be 1 to 200 strands of the birefringent islands.

The birefringent island-in-the-sea yarns preferably have a volume of 1% to 90% with respect to 1 cm 3 of the light modulator. If it is less than 1%, the brightness enhancement effect is insignificant, and if it exceeds 90%, the amount of scattering due to the birefringence interface increases, which may cause a problem of light loss.

Furthermore, 500 to 4,000,000 pieces of the birefringent island-in-the-sea yarn may be disposed in 1 c㎥ of the light modulator. The cross-sectional diameter of the islands within the birefringent islands can also have a significant effect on light modulation. When the diameter of the cross-section of each birefringent island-in-the-sea island is smaller than the wavelength of light, the effects of refraction, scattering, and reflection decrease, and light modulation hardly occurs. If the cross section diameter of the island portion is too large, light is specularly reflected from the surface of the island-in-the-sea yarn and diffusion in other directions is very small. The cross-sectional diameter of the aligned portion may vary depending on the intended use of the optics. For example, the diameter of the fiber can vary depending on the wavelength of electromagnetic radiation important for a particular application, and different fiber diameters are required to reflect, scatter or transmit visible, ultraviolet, infrared and microwave radiation.

On the other hand, according to a preferred embodiment of the present invention, the optical modulation object of the present invention may have a structured surface layer on its surface, and more specifically, the structured surface layer may be formed on the surface from which light is emitted. The structured surface layer may be prismatic, lenticular or convex. In detail, the surface on which the light on the light modulator is emitted may have a curved surface having a convex lens shape. The curved surface may focus or defocus light transmitted through the surface. In addition, the light exit surface may have a prism pattern.

Next, the method of manufacturing the birefringent island-in-the-sea yarn of the present invention will be described. The birefringent island-in-the-sea yarn of the present invention can be applied without any limitation as long as it is a method capable of producing a conventional island-in-the-sea yarn such as a composite spinning process. The spinnerets and spinnerets used can be used as long as they can produce birefringent islands, but generally the spinnerets and yarns are designed to substantially match the arrangement of the islands in the cross-section of the birefringent islands. Can be used. Specifically, a sea component flowed from a flow channel designed to fill the gap between the island component extruded from a hollow pin or a spinning nozzle appropriately designed to allow the island portion to be partitioned inside the spinneret, and the flow of water It is possible to form an island-in-the-sea yarn by extruding from the discharge port while gradually thinning, and any spinneret can be used as long as the island-in-the-sea yarn includes two or more spinning centers. Examples of spinnerets preferably used are shown in FIGS. 11 and 12, but spinnerets that can be used in the method of the present invention are not necessarily limited to these.

Specifically, Figure 11 is an example of a preferred spinneret that can be applied to the present invention. Specifically, in the spinneret 100, the conductive polymer (molten body) in the conductive polymer storage portion 101 before distribution is distributed in the conductive polymer introduction passage 102 formed by the plurality of hollow pins, The sea component polymer (melt) is introduced into the sea component polymer storage section 104 before dispensing through the sea component polymer introduction passage 103. The hollow pins forming the island component polymer introduction passage 102 respectively penetrate through the polymer storage portion 104 for sea component, and are located at the centers of the respective inlets of the plural ecchotype compound flow passages 105 formed thereunder. It is open downward. The island component polymers are introduced into the central portion of the vinegar composite flow passage 105 from the lower end of the island component polymer introduction passage 102, and the sea component polymers in the sea component polymer storage section 104 are the passages for the vinegar composite flow passage. In 105, a core component is introduced so as to surround the island component polymers, and the sea component polymers are formed with sea component polymers as a seam, and the core portion is centered on two or more radiation centers. The cores are grouped and arranged. After the plural cardiac complexes are introduced into the funnel-shaped confluence passage 106, in the confluence passage 106, the pleural pleated complexes are joined to each other by the seaweed-shaped complex flows. do. This island-in-the-sea composite flow gradually decreases the cross-sectional area in the horizontal direction while flowing inside the funnel-shaped confluence passage 106 and is discharged from the discharge port 107 at the lower end of the confluence passage 106.

12 is an example of another preferred spinneret 110 of the present invention, in which the island component polymer storage section 111 and the sea component polymer storage section 112 are formed of a plurality of penetration holes. Connected to each other, the island-based polymer (melt) in the island-based polymer storage 111 is distributed in the plurality of island-based polymer introduction passages 113 and introduced therethrough into the sea-component polymer storage 112. . Meanwhile, the sea component polymer is accommodated in the sea component polymer storage 112 through the sea component polymer furnace 115. On the other hand, the island component polymers introduced into the sea component polymer storage section 112 penetrate through the sea component polymer (melt) accommodated in the sea component polymer storage section 112 and enter into the aquatic composite flow passage 114. After it flows in, it flows down the central part. On the other hand, the sea component polymer in the sea component polymer storage part 112 flows down to surround the island component polymers which flow down the center part in the deep-sea type composite flow passage 114. As a result, in the plurality of edible-type composite flow passages 114, a plurality of edible-type composite flows are formed, and flow down into the funnel-shaped confluence passage 116, and eventually, the island-in-the-sea composite as in the spinneret of FIG. A birefringent seaweed of the present invention is finally produced by forming a stream, flowing down while decreasing the horizontal cross-sectional area, and passing through the discharge port 117.

As a result, the birefringent island-in-the-sea yarn of the present invention, unlike the conventional islands-in-the-sea yarn, does not generate agglomeration of island portions, so that the number of island portions can be arranged to 1000 or more, so that a large number of birefringent interfaces can be formed. It is particularly effective for improving modulation efficiency and enhancing luminance.

Furthermore, in the case of producing a composite fiber by twisting multiple strands or dozens of islands, for example, when manufacturing one composite fiber by twisting 10 islands or yarns, the composite fiber has 100 birefringent interfaces and at least 100 times of light. Modulation can occur. In addition, in the case of manufacturing the island-in-the-sea yarn spun into several strands, for example, if the island-in-the-sea yarn of 10 strands is manufactured, 100 birefringent interfaces exist in the composite fiber, and at least 100 light modulations may occur. The island-in-the-sea yarn of the present invention may be manufactured by a coextrusion method, but is not limited thereto.

Therefore, if the conventional island-in-the-sea yarn utilizes the remaining island portion as a micro-fine fiber by eluting the sea portion regardless of whether it is birefringent or not to produce the microfiber yarn, in the present invention, the sea portion and island portion are not eluted. It is assumed that the island-in-the-sea yarn having different optical properties is used by itself. In the present invention, only the case where the island portion is composed of anisotropy and the sea portion is isotropic is assumed, but the object of the present invention may be achieved in the opposite case. .

Hereinafter, the present invention will be described in detail by Examples and Experimental Examples. The following Examples and Experimental Examples are merely illustrative of the present invention, and the scope of the present invention is not limited to the following Examples and Experimental Examples.

<Example 1>

An isotropic PC alloy in which polycarbonate and modified glycol polycyclohexylene dimethylene terephthalate (PCTG) is mixed at 5: 5 as a sea component (nx = 1.57, ny = 1.57, nz = 1.57), and anisotropic PEN (nx = 1.88, ny = 1.57, nz = 1.57). In order to obtain the island-in-the-sea yarn of the cross section as shown in FIG. Through this composition, the undrawn yarn 150/24 was spun under the condition of spinning temperature of 305 ° C. and the spinning speed of 1500 M / min, and then the drawn yarn 50/24 was obtained by three times stretching. The group-shaped island-in-the-sea yarn manufactured as described above is arranged in two spinning cores, each of which has 200 islands each grouped in 100. As a result, after weaving 24 strands of the prepared island-in-the-sea yarn, the weft yarn is used as a weft yarn. Was woven into a fabric. Thereafter, the island-in-the-sea yarn fabric is placed between two PC alloy sheets made of the same material as the sea portion of the birefringent island-in-the-sea yarn, and then pressurized with a constant tension to laminate the woven fabric with the island-in-the-sea yarn inside the Pc alloy sheet. I was. Subsequently, a mixed UV cured coating resin of an epoxy acrylate having a refractive index of 1.54 and a urethane acrylate is given to the point where the fiber is laminated to the PC alloy sheet and the mirror roll, and UV cured through primary and secondary birefringence. A fused sheet was prepared in which the island-in-the-sea yarn was laminated. The coating resin exhibits a refractive index of 1.54 before the UV coating curing but a refractive index of 1.57 after curing. As a result, a luminance-enhanced film having a thickness of 400 μm was manufactured.

<Example 2>

Light modulation is carried out in the same manner as in Example 1 except that the cross-sectional shape of the island-in-the-sea yarn corresponds to FIG. The object was prepared.

<Example 3>

The optical modulation was carried out in the same manner as in Example 1 except that the cross-sectional shape of the island-in-the-sea yarn corresponds to FIG. The object was prepared.

Comparative Example 1

Except that the island portion is isotropic PET (nx = ny = nz = 1.57), the sea portion is isotropic C0-PEN (nx = ny = nz = 1.57), and sea island yarn having a cross section of the island-in-the-sea yarn corresponding to FIG. 4 is used. In the same manner as in Example 1, a light modulator having a thickness of 400 μm was manufactured.

Comparative Example 2

After superposing | polymerizing the PEN resin of IV 0.53 instead of the birefringent island-in-the-sea yarn of Example 1, the yarn of the unstretched yarn 150/24 was produced. At this time, the spinning temperature was 305 ℃, spinning speed was applied by applying 1500 M / min. The obtained undrawn yarn was stretched three times at a temperature of 150 ° C. to produce 50/24 drawn yarn. The stretched PEN fibers exhibit birefringence and the refractive indices in each direction are nx = 1.88, ny = 1.57, and nz = 1.57. Except for including the birefringent PEN fibers in place of the island-in-the-sea yarn of Example 1 was carried out in the same manner as in Example 1 to prepare a light modulated object having a thickness of 400㎛.

Comparative Example 3

Light modulation is performed in the same manner as in Example 1 except for using the island-in-the-sea yarn having one spinning core and 200 islands arranged around the birefringent island-in-the-sea yarn as shown in FIG. 2A. The object was prepared.

<Comparative Example 4>

Light modulation is carried out in the same manner as in Example 1 except for using the island-in-the-sea yarn having one spinning core and 500 islands arranged around the birefringent island-in-the-sea yarn as shown in FIG. 2B. The object was prepared.

Experimental Example

Examples 1 to 3 and Comparative Examples 1 to 4 to evaluate the physical properties as follows for the optical modulated object manufactured through the results are shown in Table 1.

1. Luminance

In order to measure the brightness of the prepared optical modulation object was performed as follows. After assembling the panel on a 32 "direct backlight unit equipped with a diffuser plate, two diffuser sheets, and a light modulator, the luminance was measured at nine points using Topcon's BM-7 measuring instrument.

2. Transmittance

Permeability was measured by ASTM D1003 method using COH300A analysis equipment of NIPPON DENSHOKU, Japan.

3. Polarization degree

The degree of polarization was measured using an OTSKA RETS-100 analyzer.

4. Water absorption rate

The change in weight percent of the sample before and after the treatment was measured after immersion in water at 23 ° C. for 24 hours according to ASTM D570.

5. Seatum

       The light modulator was assembled into a 32-inch backlight unit and left for 96 hours in a constant temperature and humidity chamber at 60 ° C and 75%. After disassembly, the degree of light modulation of the light modulator was visually observed and classified into ○, △, and ×.

        ○: Good, △: Normal, ×: Poor

6. UV resistance

       After irradiating the output of 130mW UV lamp (365nm) for 10 minutes at 10cm height using Semyung Baektron's SMDT51H, YI (Yellow Index) before and after treatment was measured by using NIPPON DENSHOKU's SD-5000 analysis equipment. Yellowness was evaluated.

TABLE 1

Luminance (cd / ㎡) Transmittance (%) % Polarization Absorption rate (%) Sheet help UV resistance Example 1 400 52 78 0.24 O 2.3 Example 2 420 48 80 0.24 O 2.0 Example 3 420 48 80 0.24 O 2.0 Comparative Example 1 290 85 5 0.24 O 1.5 Comparative Example 2 320 55 50 0.24 O 1.8 Comparative Example 3 380 58 70 0.24 O 2.0 Comparative Example 4 390 56 72 0.24 O 2.0

As can be seen from Table 1, the optical modulators (Examples 1 to 3) including the birefringent island-in-the-sea yarn of the present invention had better overall optical properties than Comparative Examples 1 to 4 without using them. In particular, as shown in Example 2, the best effect was to use the island-in-the-sea yarn having the cross section as shown in FIG.

On the other hand, as can be seen from Comparative Example 1, even when the birefringent island-in-the-sea yarn cross section of the present invention is adopted, when the optical properties of the island portion and the sea portion are the same, the effect of brightness enhancement hardly occurs. Even when the optical characteristics were different, the optical properties were poor even when the shape of the cross section of a normal island-in-the-sea yarn having one emission core was adopted. Through this, it can be seen that the optical properties of the island portion and sea portion are different, but the cross-sectional shape has very excellent optical properties when the shape of the birefringent island-in-the-sea yarn of the present invention is adopted.

Since the light modulating object manufactured by the manufacturing method of the present invention is excellent in the light modulating performance, it can be widely used in the field requiring the modulation of light. Specifically, optical devices such as cameras and microscopes, automotive exterior materials, and mobile phones and LCDs may be widely used in flat panel display technologies such as liquid crystal displays, projection displays, plasma displays, field emission displays, and electroluminescent displays.

Although the present invention has been described in detail only with respect to the matrix embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the present invention, and such modifications and modifications belong to the appended claims. will be.

1 is a perspective view of a conventional light modulation object.

2A and 2B are electron micrographs of a conventional islands-in-the-sea cross-section.

Figure 3 is a schematic diagram of the cross section of the cut surface of the luminance-enhanced film according to an embodiment of the present invention.

4 is a cross-sectional view of a group island-in-the-sea yarn according to a preferred embodiment of the present invention.

5 is a cross-sectional view of a group island-in-the-sea yarn according to another preferred embodiment of the present invention.

6 is an electron micrograph of a group islands-in-the-sea yarn according to another preferred embodiment of the present invention.

7 is a cross-sectional view of a group island-in-the-sea yarn according to another preferred embodiment of the present invention.

8 is a cross-sectional view of a group island-in-the-sea yarn according to another preferred embodiment of the present invention.

9 is a cross-sectional view showing a path of light incident on the birefringent island-in-the-sea yarn of the present invention.

10 is a fabric woven using the birefringent island-in-the-sea yarn of the present invention as weft and / or warp yarns.

11 is a cross-sectional view of a portion of a spinneret in accordance with a preferred embodiment of the present invention.

12 is a cross-sectional view of a portion of a spinneret according to another preferred embodiment of the present invention.

Claims (38)

Inside the matrix, the islands are arranged around two or more radiating cores to form a partitioned group, but the maximum of the center distances between adjacent islands within the same group is the maximum of the center distances between neighboring islands between neighboring groups. And disposing a birefringent island-in-the-sea yarn smaller than the value. The method of claim 1, wherein the radiation core has one radiation reference core positioned at the center of the birefringent island-in-the-sea yarn and a plurality of radiation peripheral cores are arranged around the radiation core. The method of claim 2, wherein the separation distance between the radiation reference core and the plurality of radiation peripheral cores is substantially the same. 3. The method of claim 2, wherein the plurality of radiation peripheral cores substantially correspond to their respective separation distances. 4. The method of claim 2, wherein the radiation peripheral core is 3 to 20, characterized in that the manufacturing method. The method of claim 2, wherein the radiation peripheral core is 6 to 10. The method of claim 2, wherein 10 to 300 degree portions are arranged with respect to the one radiation reference core or one radiation peripheral core. The method of manufacturing an optical modulator according to claim 1, wherein the total number of sections is 38 to 1500. The method of manufacturing an optical modulator according to claim 1, wherein the total number of the parts is 500 to 1500. The method of manufacturing a light modulating object according to claim 2, wherein the total number of conductive parts is 1000 to 1500. The method of claim 1, wherein the cross-sectional shape of the grouped islands is arranged in a circle or a polygon. The method of manufacturing an optical modulator according to claim 11, wherein the cross-sectional shapes of the grouped drawing portions coincide with each other. 12. The method of claim 11, wherein the cross-sectional shape of the grouped portions is different. The method of claim 1, wherein a radiation core is arranged based on the center of the birefringent island-in-the-sea yarn. 15. The method of claim 14, wherein a radiation core is not formed at the center of the birefringent island-in-the-sea yarn. 15. The method of claim 14, wherein the number of radiating cores is 3 to 20. 15. The method of claim 14, wherein the number of radiating cores is 6 to 10. The method of claim 1, wherein the single yarn fineness of the birefringent island-in-the-sea yarn is 0.5 to 30 denier. The method of claim 1, wherein the single yarn fineness of the island portion of the birefringent islands is 0.0001 ~ 1.0 denier. The method of claim 1, wherein a birefringent interface is formed inside the birefringent island-in-the-sea yarn. 21. The method of claim 20, wherein the island portion of the birefringent island-in-the-sea yarn is anisotropic and the sea portion is isotropic. The island portion of the island-in-the-sea yarn is polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, Polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), poly Urethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer, the method for producing a light modulated object. The sea portion of the island-in-the-sea yarn is polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) Roy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS) , Polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol And epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer. The method of claim 1, wherein the matrix is isotropic. The method of claim 1, wherein the refractive index of the matrix and the birefringent island-in-the-sea yarn has a difference in refractive index of 0.03 or less in the two axial direction, the difference in refractive index of the other one axial direction is 0.05 or more of the Manufacturing method. The matrix and the matrix of claim 1, wherein the refractive index of the matrix in the x-axis direction is nX1, the refractive index in the y-axis direction is nY1, the refractive index in the z-axis direction is nZ1, and the refractive indices of the birefringent island-in-the-sea yarns are nX2, nY2 and nZ2. A method of manufacturing an optical modulator according to claim 1, wherein at least one of the refractive indexes of the X, Y, and Z axes of the birefringent islands is coincident. 27. The method of claim 26, wherein the refractive index of the birefringent island-in-the-sea yarn is nX2> nY2 = nZ2. The refractive index of the sea portion and the island portion of the birefringent island-in-the-sea yarn has a difference in refractive index of 0.03 or less in two axial directions, and a difference in refractive index in one remaining axial direction of 0.05 or more. Method for producing a modulated object. 29. The refractive index of the birefringent island-in-the-sea yarn according to claim 28, wherein the refractive index in the x-axis direction in the longitudinal direction is nX3, the refractive index in the y-axis direction is nY3, and the refractive index in the z-axis direction is nZ3. When the refractive index in the nX4 and y-axis directions is nY4 and the refractive index in the z-axis direction is nZ4, at least one of the X, Y and Z-axis refractive indices of the matrix and the birefringent island-in-the-sea yarns is produced. Way. 30. The method of claim 29, wherein the absolute value of the difference between the refractive indices of nX3 and nX4 is 0.05 or more. The method of claim 1, wherein the refractive index of the sea portion of the island-in-the-sea yarn coincides with the refractive index of the matrix. 22. The method of claim 21, wherein the area ratio of the sea portion and the island portion is 2: 8 to 8: 2 based on the cross-section of the birefringent island-in-the-sea yarn. The method of claim 1, wherein the birefringent island-in-the-sea yarn is elongated in the longitudinal direction. The method of claim 1, wherein the light modulator has a structured surface. The method of claim 1, wherein the birefringent island-in-the-sea yarn is a fabric. 36. The method of claim 35, wherein the fabric is woven using the birefringent island-in-the-sea yarn using at least one of weft and warp yarns. 37. The method of claim 36, wherein one of the weft yarn and the warp yarn is the island-in-the-sea yarn and the other is isotropic fiber. 37. The method of claim 36, wherein the weft yarn or warp yarn is formed by gathering 1 to 200 strands of the island-in-the-sea yarn.

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