JP2011053677A - Multifunctional board and multifunctional board with leg - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multifunctional board which can be used also as a projection screen while it is used as a blackboard or white board. <P>SOLUTION: The multifunctional board with leg (1-1) includes a multifunctional board (1), a lower support leg (2), a roller (5) disposed at a bottom portion of the lower support leg (2), a fixing pipe frame (3) for fixing and connecting the multifunctional board (1) to the lower support leg (2), and a power source (4) for a light source (104). The multifunctional board (1) includes a light guide plate (101) installed in and fixed to a fixing side frame (105), a rear projection screen film (103) provided on one surface of the light guide plate (101), and the light source (104) installed on at least one end portion of the light guide plate (101). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a multifunction board that can be used as a projection screen while being used as a blackboard or a white board.

  At present, projection screens are indispensable because projection devices are used in schools and conference venues while using blackboards and whiteboards. However, separate use of a blackboard or whiteboard and a projection screen is very inconvenient and requires a large installation space. In addition, with a normal blackboard or whiteboard, there is a problem that it is difficult to see what is written on the board surface when used in a dark environment (Patent Document 1).

JP-A-10-000896

  Therefore, in order to solve the above-mentioned problems, the present inventors have intensively studied, and as a result, have reached the present invention.

  The multi-functional board with legs of the present invention that solves the above problems includes a multi-functional board, a lower support leg, a roller disposed at the bottom of the lower support leg, and a fixed pipe frame that fixes the multi-function board and connects to the lower support leg. A multi-function board with legs including a power source of the light source, the multi-function board being disposed and fixed inside a fixed side frame, and a back surface provided on one surface of the light guide plate The projection screen film and the light source disposed at at least one end of the light guide plate.

  Further, a writing layer is provided on the surface of the light guide plate opposite to the side on which the rear projection screen film is adhered or arranged.

  Further, the light source is an LED.

  Further, the multifunction board of the present invention includes a light guide plate disposed and fixed inside a fixed side frame, a rear projection screen film provided on one surface of the light guide plate, and at least one of the light guide plates. And a light source disposed at the end.

  Further, a writing layer is provided on the surface of the light guide plate opposite to the side on which the rear projection screen film is adhered or arranged.

  Further, the light source is an LED.

  According to the present invention, a blackboard or whiteboard and a projection screen can be used at the same time, and space can be saved. In addition, it has the function of an ordinary blackboard or whiteboard, and fluorescent light is emitted from the board surface by the light emitting function, so that what is written on the board surface can be seen vividly even when used in a dark room. Furthermore, it is very convenient because characters can be written on the front of the board while projecting an image from the back using a projector.

Sectional drawing which shows one Embodiment of the multifunction board of this invention Schematic which shows one Embodiment of the multifunction board with a leg of this invention

  The multifunction board with legs of the present invention includes a multifunction board, a lower support leg, a roller disposed at the bottom of the lower support leg, a fixed pipe frame that fixes the multifunction board and connects to the lower support leg, a power source of a light source, A multifunction board with legs, wherein the multifunction board is arranged and fixed inside a fixed side frame, a rear projection screen film provided on one surface of the light guide plate, And the light source disposed at at least one end of the light guide plate. Hereinafter, embodiments of each component will be described.

  The multi-functional board with legs of the present invention is provided with a light guide plate capable of emitting light on the board and a rear projection screen film capable of projecting an image from the back to emit light from the board, project an image from the back to the board, It is possible to provide a multifunction board with legs that can be used for writing characters. For example, as shown in FIGS. 1 and 2, the multifunction board (1-1) with legs is composed of a multifunction board (1), a lower support leg (2), and rollers (5) disposed on the bottom of the lower support leg (2). ), A multi-functional board with legs (1-1) including a fixed pipe frame (3) for fixing the multi-functional board (1) and connecting to the lower support leg (2), and a power source (4) for the light source (104). The multifunction board (1) is provided on one surface of the light guide plate (101) and the light guide plate (101) disposed and fixed inside the fixed side frame (105). The rear projection screen film (103) and the light source (104) disposed on at least one end of the light guide plate (101) are configured.

  The configuration of the multifunction board (1) will be described below.

  The light guide plate (101) has at least one side end as a light incident surface, and both surfaces substantially perpendicular to the light incident surface.

  As shown in FIG. 1, the light guide plate (101) is arranged and fixed inside the fixed side frame (105). In addition, a light source (104) is disposed on at least one side end of the light guide plate (101).

  In this way, the light guide plate (101) can emit light brightly by guiding the light from the light source (104).

  The haze (JIS K7136: 2000) of the light guide plate is preferably 2% or more. By setting the haze to 2% or more, it is possible to sufficiently emit light from the light emitting surface side of the light guide plate, and to make it easy to obtain sufficient brightness when a multifunction board is obtained. Thus, when the haze of the light guide plate is increased, the luminance on the light exit surface side of the light guide plate can be increased, and the handwritten characters on the writing layer described later can be easily seen.

  Further, the haze of the light guide plate is preferably 10% or more and 40% or less. For example, by setting the haze of the light guide plate to 10% or more, the amount of light emitted from the light exit surface can be increased, and handwritten characters can be brightly illuminated from behind to make it easier to see. In addition, by setting the haze of the light guide plate to 40% or less, it is possible to make it difficult for the screen image to be deteriorated due to excessive light diffusion of the image projected on the screen. For this reason, the projected image of the screen can be easily seen when viewed through the light guide plate.

The haze of the light guide plate can be adjusted by the thickness of the light guide plate and the amount of light diffusing agent added in the light guide plate. For example, in order to make haze 2 to 40%, the thickness of the light guide plate is 2 to 20 mm, and the light diffusing agent is contained in an amount of 0.3 × 10 ^{−5 to} 0.1 parts by weight with respect to 100 parts by weight of the transparent resin. .

  The thickness of the light guide plate is preferably 20 mm or less. By setting the thickness of the light guide plate to 20 mm or less, diffusion of the projected image on the screen due to the thickness in the light guide plate can be easily reduced, and bleeding of the image can be made difficult.

  The light guide plate constituting the multifunction board can be obtained by kneading a light diffusing agent in a transparent resin or glass and molding it into a substantially flat plate shape.

  Transparent resins include polyester resins, acrylic resins, acrylic urethane resins, polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, urethane resins, epoxy resins, polycarbonate resins, cellulose resins, and acetals. Resin, polyethylene resin, polystyrene resin, polyamide resin, polyimide resin, melamine resin, phenol resin, silicone resin and other thermoplastic resins, thermosetting resins, ionizing radiation curable resins, etc. . Among these, acrylic resins having excellent optical properties are preferably used, and among them, polymethyl methacrylate resin is particularly preferable.

  The glass is not particularly limited as long as the light diffusibility of the light diffusion layer is not lost, but in general, oxide glass such as silicate glass, phosphate glass, borate glass and the like can be mentioned. .

  As light diffusing agents, inorganic fine particles such as calcium carbonate, magnesium carbonate, barium sulfate, silica, aluminum hydroxide, kaolin, clay, talc, mica, pearl, acrylic resin particles, silicone resin particles, polystyrene resin particles, polyurethane resin Examples thereof include organic particles such as particles, polyethylene resin particles, benzoguanamine resin particles, and epoxy resin particles, or transparent resin beads.

  The rear projection screen film (103) has a function of forming an image from the projector on the rear projection screen film (103) so that the image can be viewed from the side opposite to the projector.

  Although this transmission type screen is not limited, it is composed of at least a light diffusion layer. This light diffusion layer is mainly composed of fine particles and a transparent binder.

  The transparent binder is not limited to a solid and may be a fluid such as a liquid or a liquid crystal as long as it is transparent and can uniformly hold fine particles. However, in order to make it easy to maintain the shape of the transmissive screen with a single light diffusion layer, glass or a polymer resin is preferable, and a polymer resin is preferable from the viewpoint of handleability and dispersion stability.

  The glass is not particularly limited as long as the light diffusibility of the light diffusion layer is not lost, but in general, oxide glass such as silicate glass, phosphate glass, borate glass and the like can be mentioned. .

  The polymer resin is not particularly limited as long as the light transmittance of the light diffusion layer is not lost. Polyester resin, acrylic resin, acrylic urethane resin, polyester acrylate resin, polyurethane acrylate resin, epoxy acrylate resin Resin, Urethane resin Epoxy resin, Polycarbonate resin, Cellulose resin, Acetal resin, Vinyl resin, Polyethylene resin, Polystyrene resin, Polypropylene resin, Polyamide resin, Polyimide resin, Melamine resin, Phenol Thermoplastic resins such as resin, silicone resin and fluorine resin, thermosetting resin, ionizing radiation curable resin and the like can be used.

  As fine particles to be included in the transparent binder, inorganic fine particles such as silica, alumina, talc, zirconia, zinc oxide and titanium dioxide, and organic fine particles such as polymethyl methacrylate, polystyrene, polyurethane, benzoguanamine and silicone resin are used. can do.

  The particle diameter of the fine particles is preferably 1 to 20 μm in average particle diameter. Further, the particle size distribution of the fine particles may be monodispersed or polydispersed, but is preferably monodispersed from the viewpoint of further improving the sharpness of the image.

  The transmissive screen may be composed of a single light diffusing layer, or may have a light diffusing layer on a transparent substrate such as a plastic film or glass.

  When an image is projected from the projector, an image can be formed on the light diffusion layer, and an image formed on the light diffusion layer can be viewed.

  The thickness of the transmissive screen is not particularly limited as long as the image can be seen satisfactorily, such as a type composed of a single light diffusing layer or a type having a light diffusing layer on a transparent substrate. preferable. By setting the thickness of the transmissive screen to 2 mm or less, it is possible to easily prevent the image formed on the light diffusion layer from being excessively diffused and to make the image projected on the screen clear. In the case of a transmissive screen film having a transparent substrate, when the transparent substrate side of the transmissive screen film is arranged facing the light guide plate, an image is formed on the screen due to the thickness of the transparent substrate. The image is easily diffused too much. For this reason, it is preferable that the thickness of the transparent base material of a transmissive screen film shall be 1 mm or less.

  The transmissive screen film and the light guide plate are preferably provided as close as possible. For example, the transmissive screen film (103) and the light guide plate (101) are bonded using a transparent adhesive or the like. In this way, when the transmissive screen film (103) and the light guide plate (101) are brought into contact with each other, the diffusion of the projected image generated in the gap between the rear projection screen film (103) and the light guide plate (101) is reduced. can do. For this reason, the image projected on the rear projection screen film (103) viewed through the light guide plate (101) can be made clear and easy to see.

  Moreover, as an optical characteristic of a transmissive screen, haze (JIS K7136: 2000) is preferably 60% or more, and more preferably 80% or more. By setting the haze to 60% or more in this way, the viewing angle of the image projected from the projector can be made sufficiently wide, and the side opposite to the viewer of the display member can be made difficult to see. Further, if the haze is too high, the total light transmittance tends to decrease and the projected image tends to become dark, so the upper limit of haze is preferably 95%. The haze can be set to the above-described range by appropriately adjusting the content of fine particles contained in the light diffusion layer and the thickness of the light diffusion layer. In the transmission screen of the present invention, the total light transmittance (JIS K7361-1: 1997) is preferably 70% or more.

  As shown in FIG. 1, the rear projection screen film (103) is disposed on the fixed side frame (105) and fixed on the light guide plate (101) and on one surface of the light guide plate (101). To.

  An adhesive may be used when arranging the rear projection screen film (103) and the light guide plate (101).

  For example, the adhesive may be an acrylic pressure sensitive adhesive or a rubber pressure sensitive adhesive. Among these, an acrylic pressure-sensitive adhesive that is not easily yellowed by ultraviolet rays is preferable.

  As shown in FIG. 1, the light source (104) is disposed at at least one end of the light guide plate (101) and emits light. For example, the light source (104) may be arranged to emit light in a state where the light source (104) is arranged in a hole around the light guide plate (101) and accommodates the light source.

  Around the light source, it is preferable to cover the light source with a housing, a lamp reflector or the like except for the light guide plate side so that light is efficiently incident on the light guide plate. Moreover, in order to prevent light leakage, it is preferable that the side end portion of the light guide plate where the light source is not disposed is bonded with a reflective tape.

  As the light source, a fluorescent lamp, a cold cathode tube, or the like can be used, but an LED can be suitably used for the multifunction board of the present invention.

  The LED can be suitably used because it uses a light-emitting diode as a light source and has low power consumption and long life. Further, the LED preferably has white light, and the color of characters written on the board can be improved in color rendering. When an LED is used, the amount of heat generated can be reduced, and deformation due to heating to a screen, a light guide plate, a writing layer or the like can be prevented. Further, when an LED is used, the amount of ultraviolet rays generated can be reduced, and the number of insects that are attracted by light can be reduced.

  The writing layer (102) is provided on the surface of the light guide plate (101) opposite to the side on which the rear projection screen film (103) is disposed. The writing layer (102) is disposed on the surface of the light guide plate (101).

  Further, the writing layer (102) has writing ability and erasing ability by a blackboard or whiteboard marker.

  The writing layer preferably has functions such as scratch prevention, antireflection, and antiglare. Such a writing layer (102) has a structure having at least a base material layer and at least one surface being a writing erasable surface.

  When used as a whiteboard, the surface that can be erased by writing preferably has a specular gloss (JIS K5600-4-7: 1999) of 70% or more at the lower limit and preferably 135% or less at the upper limit. 120% or less is more preferable. By setting the mirror glossiness to 70% or more, it is possible to easily erase characters written with a whiteboard marker. Further, by setting the specular gloss to 135% or less, it is possible to easily prevent reflection of illumination.

  Moreover, it is preferable that the surface of the writing erasable surface has a pencil hardness (JIS K5600-5-4: 1999) HB or higher, more preferably H or higher. By setting the pencil hardness to HB or higher, it is possible to prevent scratches when repeated erasing with a whiteboard marker is repeated.

  The writable erasable surface is preferably formed of a curable resin such as a thermosetting resin or an ionizing radiation curable resin. Thus, when curable resin is used, surface hardness can be made into pencil hardness HB or more, and it can prevent a damage | wound.

  When used as a blackboard, the erasable surface can be used as a blackboard if the writing layer is provided with appropriate irregularities. Due to the unevenness of the erasable surface, the calcium carbonate chalk can be appropriately scraped to make erasure possible. Specifically, the surface of the writing layer is such that the surface of the writing layer has a centerline surface roughness (JIS B0601-1982) of about 0.5 to 5 μm (cutoff value: 0.8 mm, measurement length: 5 mm). It is preferable to give unevenness to the surface.

  As a means for imparting appropriate irregularities to the writing layer as described above, it is possible to apply a roughening treatment to the surface of the base material described above and to provide a writing layer thereon. However, the writing layer is matted. A method of containing an agent is preferably employed. As described above, when a matting agent is contained in the writing layer, it is possible to easily prevent the writing on the erasable surface.

  Examples of such a matting agent include known inorganic and organic resin fine particles such as silica, alumina, titanium dioxide, talc, calcium carbonate, barium sulfate, zirconium oxide, clay, styrene resin, urethane resin, acrylic resin, and silicone resin. What mixed 1 type (s) or 2 or more types can be used.

  Further, the average particle size of such a matting agent needs to be appropriately selected according to the film thickness adjusted to satisfy the other performance of the writing layer, preferably 1 to 30 μm, more preferably Is preferably 3 to 20 μm.

  The total light transmittance (JIS K7361-1: 1997) of the writing layer is preferably 60% or more. Furthermore, it is more preferable that it is 80% or more. By setting the total light transmittance to 80% or more, the image projected on the rear projection screen film and the characters written on the writing layer can be brightened and viewed.

  Moreover, it is preferable that the haze (JIS K7136: 2000) of a writing layer is 50% or less. By setting it to 50% or less, it is possible to make it difficult for the image projected on the screen to be reflected on the writing layer, and to make the image on the screen clear and easy to see.

  The fixed side frame (105) includes a light guide plate (101), a rear projection screen film (103) provided on one surface of the light guide plate (101), and the rear projection screen film of the light guide plate (101). A writing layer (102) provided on a surface opposite to a side on which (103) is bonded or disposed, and the light source (104) disposed on at least one end of the light guide plate (101). Can be placed and fixed. Thus, after forming the multifunction board (1), the fixed side frame (105) in the multifunction board (1) can be connected to the fixed pipe frame (3) described later.

  The fixed side frame (105) arranges and fixes a laminated body such as a light guide plate (101), a rear projection screen film (103), a writing layer (102), and a light source (104). For this reason, the fixed side frame (105) may be provided with a convex portion that increases the contact area with the laminated body inside the fixed side frame (105) so that the laminated body can be easily fixed.

  The fixed side frame (105) includes at least one side of the laminate described above. Preferably, all sides of the laminate are included. Thus, it can be made easy to protect a multifunction board (1) by setting it as the form containing all the sides of a layered product. For example, it can be easily protected from an impact applied to the outer peripheral portion of the multifunction board (1). Further, it is possible to easily prevent dust from entering the multi-function board (1).

  Since the fixed side frame (105) is used as a casing, it requires mechanical strength. Therefore, a material obtained by processing a metal such as iron, stainless steel, and aluminum is preferably used as the material of the fixed side frame (105). In addition to these metals, if there is no problem in heat, strength, and durability, a material formed by forming a resin such as plastic may be used.

  As described above, the multifunction board of the present invention is configured to project an image onto the screen using the rear projection screen film (103) from the back without the board user using the projector. For this reason, the light rays projected from the projector do not irradiate a human body or face, and do not make it difficult to see the board by reflecting a human figure. Also, since the image is projected from the back, there is an effect that even if it is explained in front of the board, it does not interfere with the projection.

  Next, the multifunction board with legs of the present invention will be described.

  As shown in FIG. 2, the multi-functional board with legs (1-1) has a fixed pipe frame (3) and a roller (5), which will be described later, on the fixed side frame (105) of the multi-functional board (1). The lower support leg (2) arranged at the bottom of (2) is connected and fixed.

  Although it does not specifically limit as a method of connecting and fixing, A connection part which can be connected and released is provided. For example, the connecting portion may be a method in which a bolt is passed through a connecting hole and connected by a nut and fixed. Alternatively, the connecting portion may be connected and fixed by a device using a pressing lever. In addition to this, various connecting portions can be used.

  The fixed pipe frame (3) can be connected to the fixed side frame (105) of the multifunction board (1) and connected to the lower support leg (2) to be fixed. If you want to use only the multi-function board (1) separately from the multi-function board (1-1) with legs, release the connecting part between the fixed pipe frame (3) and the multi-function board (1). Only the multifunction board (1) can be used separately.

  The fixed pipe frame (3) may be provided with a table on which writing tools necessary for use as a blackboard or white board are placed, or may be provided with an exhaust device for radiating heat generated from the light source.

  The material of the fixed pipe frame (3) is not particularly limited, but a material obtained by processing a metal such as iron, stainless steel, or aluminum is used. The fixed pipe frame (3) is preferably tubular because it can be reduced in weight.

  The lower support leg (2) is connected to the fixed pipe frame (3) and can support the multifunction board (1).

Since the lower support leg (2) supports the multifunction board (1), it requires mechanical strength. For this reason, what processed metals, such as iron, stainless steel, and aluminum, is used for the material of a lower support leg (2). Moreover, it is preferable to make a lower support leg (2) into a tubular shape because it can be reduced in weight.

  A roller (5) is arrange | positioned at the bottom part of a lower support leg (2), and the movement of a legged multifunction board (1-1) becomes possible easily by the rotation part provided in the roller (5). Such a roller (5) can use what used the well-known technique.

  The power source (4) can be connected to the light source (104) of the multifunction board (1) to supply power necessary for light emission of the light source (104). The power source (4) may use a device necessary for light emission of the light source (104) inside or outside the multi-function board (1).

  As described above, according to the multi-function board with legs of the present invention, the multi-function board can be removed and used as necessary. Also, the multifunction board with legs can be easily moved and used conveniently. In addition, the multifunction board with legs of the present invention has the function of an ordinary blackboard or white board, and the light emission function emits fluorescence from the board surface of the multifunction board, and the letters written on the board are alive even in dark environments. Can be seen clearly as. In addition, the content projected from the back using the projector can be clearly seen from the front.

  Furthermore, since characters and the like can be written on the front of the board while being projected onto the screen, it is possible to use image projection and writing at the same time, and the effect that it can be used very conveniently is obtained.

  Hereinafter, the present invention will be described by way of examples. “Part” and “%” are based on weight unless otherwise specified.

[Example 1]
Using a light guide plate (Paneby L-Type: Kimoto) with a length of 470 mm x width 750 mm, and a thickness of 6 mm, a rear projection screen film (Dirad screen WSK-60: Kimoto) on one side of this light guide plate. Using a pressure sensitive adhesive layer of a rear projection screen film. Further, a writing layer (KB film N05S: a hard coat layer provided on a base material having a length of 470 mm, a width of 750 mm, and a thickness of 188 μm on the surface opposite to the side on which the rear projection screen film is attached to the light guide plate. Kimotosha) was pasted to obtain a laminate.

  Next, 8 blocks of white LED light sources (ATZ-LE004, housing height 1.5 cm: Atcue) housed in the housing were arranged at both ends on the long side of the laminate. The LED light source used has 6 LED light sources per block, and has a driving voltage of DC 20 V, a power consumption of 105 mmA per block, and a luminous flux of 700 lumens.

  Next, a reflective tape was attached to the housing portion arranged in the laminate so that light did not leak directly from the light source.

  Next, a fixed side frame (aluminum chassis) having a length of 58 cm, a width of 83 cm, and a height of 1.8 cm was prepared.

  Then, after placing and fixing the laminated body with the light source installed on the fixed side frame (105), a blindfold plate is attached to each of the fixed side frame 10 cm above and below the fixed side frame and 4 cm on each side of the fixed side frame. A functional board (1) was obtained.

  Next, aluminum was molded to obtain a fixed pipe frame (3), a fixed side frame (105), and a lower support leg (2). Thereafter, the fixed side frame (105) of the multifunction board (1), the fixed pipe frame (3), and the lower support leg (2) were connected. Furthermore, the roller (5) was attached to the lower support leg (2) to obtain a multifunction board (1-1) with legs.

  The light source of the multifunction board with legs of Example 1 was lit in an environment where the room lighting was turned on. Further, an image was projected from the opposite side of the writing layer onto the rear projection screen film using a projector, and letters were formed on the surface of the writing layer using a whiteboard marker. Then, it visually observed about the visibility of a character and an image observed from the writing layer side. As a result, in Example 1, characters and images were very easy to see and excellent in visibility. In particular, since the light source of the multi-functional board with legs is used, the written characters can be seen with a high contrast between the character portion and the non-character portion, and are very easy to see. Note that the characters written with the whiteboard marker could be easily deleted.

  Subsequently, the indoor multifunctional board was turned off, and the multi-functional board with legs of Example 1 was tested in the same manner, and the visual evaluation of characters and images was similarly performed. As a result, in Example 1, the light source of the multi-functional board with legs is used in spite of the dark environment in which the room lights are turned off, so that the characters can be illuminated and lightened. It was very easy to see. Also, the image could be clearly seen without degrading the image quality. For this reason, the character and the image were similarly excellent in visibility.

DESCRIPTION OF SYMBOLS 1 ... Multifunctional board 1-1 ... Multifunctional board with legs 101 ... Light guide plate 102 ... Writing layer 103 ... Rear projection screen film 104 ... Light source 105 ... Fixed side Frame 2 ... Lower support leg 3 ... Fixed pipe frame 4 ... Power supply 5 ... Roller

Claims (6)

A multifunction board with legs including a multifunction board, a lower support leg, a roller disposed at a bottom of the lower support leg, a fixed pipe frame that fixes the multifunction board and connects to the lower support leg, and a power source of a light source. ,
The multifunction board is
A light guide plate disposed and fixed inside the fixed side frame;
A rear projection screen film provided on one surface of the light guide plate;
The light source disposed at at least one end of the light guide plate;
Multi-functional board with legs, characterized by comprising   The multifunction board with legs according to claim 1, wherein a writing layer is provided on a surface of the light guide plate opposite to a side on which the rear projection screen film is adhered or disposed.   The multifunction board with legs according to claim 1, wherein the light source is an LED. A light guide plate disposed and fixed inside the fixed side frame;
A rear projection screen film provided on one surface of the light guide plate;
A light source disposed at at least one end of the light guide plate;
Multi-function board characterized by comprising   The multifunction board according to claim 4, wherein a writing layer is provided on a surface of the light guide plate opposite to a side on which the rear projection screen film is adhered or disposed.   The multifunction board according to claim 4, wherein the light source is an LED.

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