JP2011255532A - Projection screen and whiteboard device with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection screen that can obtain a photographic projected image because of having a light diffusion reflection that is suitable for projection and that is practically superior when a marker is written in or erased because a marker ink can favorably be erased, and to provide a whiteboard device with the same.SOLUTION: The projection screen includes: a substrate 7; a matrix resin 9 formed on the substrate 7; and a plurality of spherical microparticles 8 that are included in the matrix resin 9 and whose top protrudes from the matrix resin 9. The spherical microparticles 8 are formed of an oleophilic material and the matrix resin 9 is formed of an oleorepellent material.

Description

  The present invention relates to a projection screen on which a marker can be written and erased with a marker and a whiteboard device using the same.

  2. Description of the Related Art In recent years, a whiteboard device that can project data from a projector device connected to a personal computer or the like and can perform writing and erasing with a whiteboard marker has been used.

  This type of whiteboard device has, as a feature, a screen that has been subjected to surface processing for making the projection surface easy to see by diffusely reflecting the projection light from the projector. As a projection screen suitable for this type of whiteboard, Patent Document 1 discloses a whiteboard and a projection screen combined film that can be used as a projection board as well as a whiteboard. Specifically, the surface of the white synthetic resin film is made a fine uneven surface so that the surface gloss is reduced and the projection surface can be written and erased with a marker, and the hard hard coat layer is formed on the fine uneven surface. Are coated.

  FIG. 4 is a schematic diagram showing a cross-sectional structure of such a conventional whiteboard and film for projection screen, FIG. 4 (a) shows a state after writing with a marker, and FIG. 4 (b) shows writing. The state that the marker is erased. Here, 13 is a substrate made of a white synthetic resin film, 14 is a fine particle such as silica, and 15 is a matrix resin. These fine particles 14 and matrix resin 15 form a coating film layer 16. Reference numeral 17 denotes a portion on which a marker on the whiteboard is written, and 18 denotes a marker ink.

JP 11-277984 A

  However, since the film having the above conventional structure has a fine uneven surface, it has excellent light diffuse reflectance and a clear projected image can be obtained, but when used as a whiteboard, it is oily. The marker ink remained in the minute concave portions on the surface, and it was difficult to cleanly erase the written data on the whiteboard. For example, as shown in FIG. 4B, even after erasure, the written marker ink 18 enters the recesses between the fine particles 14 and remains as the remaining marker ink 19. As a result, there is a problem that the whiteboard becomes dirty due to the accumulation of ink that cannot be completely wiped off during repeated use, making it unusable. On the other hand, when the surface unevenness is made flatter, marker ink can be wiped off well, but the diffuse reflectance of light decreases, and the projector light source appears as a bright spot in the center of the projected image, so-called hot There was a problem that a spot was generated and the projectability deteriorated. In other words, when using the surface of a whiteboard as a projection surface, the diffuse reflection of light must be improved, and when the marker is written, the marker ink must be completely removed by the eraser. However, there are conflicting points in the technical configuration.

  The present invention is for solving the above-mentioned conventional problems, has a diffuse reflection property of light suitable for projection, can obtain a clear projection image that does not cause hot spots, and erases marker ink. An object of the present invention is to provide a projection screen that can be satisfactorily performed and, as a result, is practically excellent in writing and erasing markers, and a whiteboard device using the same.

  In order to achieve the above-mentioned object, the present invention comprises a base material, a matrix resin formed on the upper surface of the base material, and a plurality of spherical fine particles contained in the matrix resin and projecting the upper part from the matrix resin. The spherical fine particles are formed of an oleophilic member, and the matrix resin is formed of an oil repellent member.

  In the present invention, oil-based marker ink does not adhere to the recesses between the particles by the above-described configuration. Here, there is no problem with respect to the visibility of the ink as long as it adheres to the protruding portion of the particle even if the marker ink does not adhere to the recess at the time of writing. As described above, since the marker ink adheres only to the protruding portion of the particles, the marker ink can be erased satisfactorily. An excellent projection screen and a whiteboard device using the same can be provided. Needless to say, according to the projection screen of the present invention, a convex surface is formed on the screen, so that the diffuse reflection property of the light is maintained, and the light source of the projector looks like a bright spot in the center of the projected image. It is also possible to obtain a clear projected image that does not cause a so-called hot spot.

1 is a schematic configuration diagram of a whiteboard device according to an embodiment of the present invention. Schematic which shows the cross-sectional structure of the projection screen in one Example of this invention. The flowchart which shows the manufacturing process of the projection screen by one Example of this invention Schematic showing the cross-sectional structure of a conventional whiteboard and projection screen combined film

  A first invention includes a base material, a matrix resin formed on the upper surface of the base material, and a plurality of spherical fine particles that are included in the matrix resin and protrude above the matrix resin. Since it is formed of an oleophilic member and the matrix resin is formed of an oil-repellent member, it is possible to obtain a clear projected image that retains the diffuse reflectance of light and does not cause hot spots, A projection screen that can satisfactorily erase the marker ink can be obtained.

  According to a second aspect of the present invention, a board surface on which writing erasure is performed is formed by the projection screen according to claim 1, whereby a practically excellent whiteboard device capable of obtaining the above-described effect is obtained. Can be obtained.

(Example)
Hereinafter, an embodiment of the projection screen of the present invention and a whiteboard device using the same will be described in detail.

  FIG. 1 is a schematic configuration diagram of a whiteboard device according to an embodiment of the present invention. The whiteboard device main body 1 has a board surface 2 on which a surface layer is formed by the projection screen of the present invention. The board surface 2 has an appropriateness as a projector screen for projecting a projected image from the projector device 4 connected to the personal computer 3 or the like, and has an appropriateness for erasing writing using the whiteboard marker 5 and the eraser 6. Next, the projection screen of the present invention will be described.

  FIG. 2 is a schematic diagram showing a cross-sectional configuration of a projection screen in one embodiment of the present invention. 2 (a) and 2 (b), a substrate 7 is for forming and holding a coating layer 10 on the surface thereof, and is a coating layer composed of spherical fine particles 8 and a matrix resin 9 described later. No particular limitation is imposed as long as it has smoothness and strength that do not hinder the formation of 10 and use as a whiteboard surface. Examples of the material of the base material 7 include plastic, steel plate, wood plate, glass plate, and resin decorative plate. Further, the thickness of the substrate is not particularly limited, and a film-like or plate-like one can be used in accordance with the configuration of the whiteboard device and the board surface manufacturing method. In particular, when a sheet-like projection screen is manufactured, a polyethylene terephthalate (PET) film, a polyethylene naphthalate (PEN) film, a polyvinyl chloride film, a polycarbonate film, or the like having a thickness of about 20 to 250 μm is preferably used. be able to.

  When the base material 7 uses a transparent material for the coating layer 10, it also functions as a reflection layer for projection light transmitted through the coating layer 10 and a layer for determining the color of the board surface. It is preferably white or a light color close to white. Alternatively, a light reflecting layer (not shown) may be separately formed on the surface (back surface) opposite to the surface on which the coating film layer 10 is formed using a colorless or highly transparent material as the base material 7. . In this case, the light reflecting layer can be formed by a method such as painting with a white ink or pasting another light reflecting film material. When the board surface 2 of the whiteboard device 1 is formed, it can be used as it is when the plate-like substrate 7 is used, but when the film-like substrate 7 is used, Separately, it is also possible to use the back surface with a highly rigid plate member.

  Reference numeral 8 denotes lipophilic spherical fine particles, and 9 denotes an oil-repellent matrix resin. The spherical fine particles 8 and the matrix resin 9 constitute the coating layer 10 as described above. As is apparent from the figure, the matrix resin 9 exists between the spherical fine particles 8, and the upper portion of each spherical fine particle 8 protrudes from the matrix resin 9.

  In order to provide the coating layer 10 with light diffusive reflectivity capable of obtaining a clear projected image that does not cause hot spots, the surface of the coating layer 10 has a 60 ° specular gloss as defined in JIS Z8741. The degree is preferably 60% or less. For this reason, the fine irregularities on the surface preferably have an arithmetic average roughness Ra specified in JIS B0601 of about 0.5 μm or more. In order to form the coating layer 10 having such a fine uneven surface, it is preferable to use a spherical fine particle 8 having an average particle diameter of about 10 to 100 μm. Further, the interval between the spherical fine particles should be at least 30% or more based on the volume of the coating layer 10 so that the spherical fine particles 8 are arranged relatively densely in the coating layer 10. preferable. The thickness of the matrix resin 9 is preferably about 50 to 80% with respect to the average particle diameter of the spherical fine particles.

  11 is a marker writing part, 12 shows a marker ink. FIG. 2A shows a state in which the marker ink 12 is adhered on the board surface 2 after writing with the marker. In the present invention, since the spherical fine particles 8 are made oleophilic and the matrix resin 9 is made oleophobic, the marker ink 12 does not adhere to the portion of the matrix resin 9 on the board surface 2 and only the portion where the spherical fine particles 8 protrude. Marker ink 12 adheres. Since the spherical fine particles 8 are aligned at substantially predetermined intervals and the matrix resin 9 is substantially the same depth, the protruding portions of the spherical fine particles 8 are aligned substantially uniformly. Therefore, even if the marker ink 12 adheres only to these protruding portions, there is no problem with respect to the visibility.

  FIG. 2B shows a state in which the marker ink 12 is removed from the board surface 2 by the eraser 6. Since the marker ink is attached only to the protruding portion of the spherical fine particle 8 from the matrix resin 9, that is, only to the convex portion, the marker ink 12 remains in the concave portion between the fine particles 14 as in the prior art. There is no end to it.

  In addition, in order to ensure the strength and durability as a white board surface, it is preferable to have a surface hardness of 2H or more in pencil hardness.

  Further, each configuration will be described in detail. The spherical fine particles 8 are blended in combination with the matrix resin 9 in order to form smooth irregularities having dimensions and shapes as described later on the surface of the coating layer 10. The spherical fine particles 8 are preferably transparent or white in consideration of light reflectivity and influence on the color of the board surface.

  As the spherical fine particles 8, various glass beads, spherical inorganic fine particles, spherical resin fine particles and the like used for resin filling and surface treatment, which have an oleophilic surface, or a new oil refining treatment agent It is possible to use a product obtained by treating the surface to make a new oil. Examples of the treating agent for making the surface new oil include organosilicone, organotitanium, fatty acid, fatty acid salt, wax, lecithin and the like. As a method of treating the surface of the fine particles with such a new oil processing agent, a method of coating and reacting the surface of the fine particles with the new oil processing agent by mixing the solution containing the new oil processing agent and the fine particles, There is a method of coating the surface of fine particles with a new oil treating agent by mixing and heating the new oil treating agent and the fine particles.

  Among the spherical fine particles as described above, the spherical resin fine particles have a smooth surface, a uniform shape, physical properties such as specific gravity and thermal expansion coefficient, and chemical properties of the particle surface. Since it is advantageous in forming the coating layer 10 by a combination with the matrix resin 9 described later, it can be used particularly preferably in the present invention.

  The matrix resin 9 has a role as a base and a binder for forming a concavo-convex surface having a shape in which a plurality of spherical fine particles 8 are held on the base material 7 in a state where the upper portion protrudes. In order to prevent adhesion of marker ink, it is made of an oil-repellent resin. Such an oil-repellent matrix resin 9 can form an oil-repellent surface, and (1) a coating film can be formed on the substrate 7 alone or by mixing with a solvent. (2) The projection screen It is necessary that the coating layer 10 having sufficient strength and durability as a surface layer can be formed, and (3) it has a basic performance such as being transparent or light-colored. As long as this requirement is satisfied, the matrix resin 9 is not particularly limited, and various known oil-repellent paint resins and coating resins can be used. As an example of preferable resin, what mixed the fluorine-type additive (surface modifier) containing perfluoroalkyl group with high oil repellency in acrylic resin for coating is mentioned, for example.

  As a method of forming a film of these resins on a substrate, for example, (1) using a reactive resin raw material mixture containing an ultraviolet curable, electron beam curable or thermosetting monomer, oligomer, resin, etc. A method of curing a resin raw material by light or heat after coating to form a coating film. (2) After coating on a substrate in a state where the resin is dissolved or dispersed in a solvent, the coating film is formed by volatilizing the solvent. There is a method of forming. Among these, the method using an ultraviolet curable resin is suitable for forming the matrix resin 9 having the basic performance as described above, and there are many choices of raw materials, and it is easy to adjust the physical properties of the raw material mixture. In terms of productivity, the resin curing reaction is completed in a short time, which is advantageous and particularly preferable.

  Using the above-described constituent materials, the projection screen of the present invention can be produced by the following manufacturing process.

  Next, the manufacturing process of the projection screen according to the present invention will be described. FIG. 3 is a flowchart showing a manufacturing process of a projection screen according to an embodiment of the present invention. In FIG. 3, first, an ultraviolet curable resin solution is prepared (ST1), and the prepared resin solution is applied onto a substrate (ST2). Next, the solvent is removed by heating and drying (ST3), and then spherical fine particles are dispersed on the coating film (ST4). Finally, the resin is cured by ultraviolet irradiation to further cure the resin (ST5), and the projection screen is completed.

  The production of the UV curable resin solution (ST1) can be performed, for example, by mixing an acrylic UV curable monomer, oligomer, fluorine-based additive, photopolymerization initiator, organic solvent for dilution, etc. with a mixer. .

  In the step (ST2) of applying the resin solution onto the substrate, for example, a coating device such as a roll coater or a bar coater can be used.

  In the step of removing the solvent by heat drying (ST3), for example, a hot air dryer or an oven can be used.

  In the step (ST4) of spraying the spherical fine particles on the coating film, for example, a dry spraying device that sprays particles from the nozzle unit using a compressed gas such as nitrogen or air can be used.

  The feature of the present invention is that the coating layer 10 is composed of the lipophilic spherical fine particles 8 and the oil-repellent matrix resin 9 as described above, so that appropriate light diffusivity and wiping property of the marker ink can be obtained. By achieving both, it is to realize a projection screen that can achieve both excellent projection properties that do not cause hot spots and writing erasure by a marker, and a whiteboard device using the projection screen.

  According to the projection screen of the present invention, a clear projected image can be obtained and the marker ink can be erased satisfactorily. Therefore, the projection screen is useful as a whiteboard projection screen.

DESCRIPTION OF SYMBOLS 1 White board apparatus main body 2 Board surface 3 Personal computer 4 Projector apparatus 5 Marker 6 Eraser 7 Base material 8 Spherical microparticle 9 Matrix resin 10 Coating layer 11 Marker writing part 12 Marker ink

Claims (2)

A base material, a matrix resin formed on the upper surface of the base material, and a plurality of spherical fine particles included in the matrix resin and protruding above the matrix resin, the spherical fine particles being formed of an oleophilic member And the matrix resin is formed of an oil-repellent member. 2. A whiteboard device in which a board surface on which writing is erased is formed by the projection screen according to claim 1.

Images