JP2021003833A - Writing board - Google Patents

Abstract

To provide a writing board capable of suppressing the intrusion of foreign matter and erasing an image in a short time, and to provide a writing board capable of suppressing a decrease in stability of image recording when used repeatedly.SOLUTION: There is provided a writing sheet 1 including: a writing sheet 10 comprising a first sheet having an adhesive layer and a second sheet having a mat surface on the side facing the adhesive layer, and allowing writing on the close contact portion by partially adhering the adhesive layer and the mat surface and erasing by bending the first sheet and the second sheet together and peeling off the close contact portion; and a base member 60 having fastening means 64 capable of fastening the writing sheet 10 at a fastening portion 61.SELECTED DRAWING: Figure 1

Description

The present invention relates to a writing board using a writing sheet capable of repeated writing and erasing, in which an image can be recorded by changing the color density of a pressurized portion, and the image can be easily erased and restored. is there.

Conventionally, it is composed of a base material having an adhesive surface and a transparent cover sheet provided on the base material, and by applying pressure from above the cover sheet, the base material and the cover sheet of the pressed portion can be pressed. There is known a writing sheet that adheres and can record an image on the adhered portion. Further, a writing sheet composed of a non-adhesive base material and a transparent cover sheet having an adhesive surface provided on the non-adhesive base material is also known. Such a writing sheet can be restored to the initial state by erasing the image by peeling off the base material and the cover sheet. Therefore, the recording and erasing of the image can be repeated.

Patent Document 1 describes a pressure-sensitive writing plate in which when writing is performed from the upper surface of a sheet-like object with the tip of a writing stick, the adhesive surface of the base plate and the sheet-like object are brought into close contact with each other due to the writing pressure at this time, and the handwriting portion becomes a different color. It is disclosed. On this pressure-sensitive writing board, the handwriting is erased as follows. When the pressing lever of the erasing mechanism is pressed, the thin portion of the connecting plate of the erasing mechanism is bent, and the tips of the operating plates protruding from both ends of the pressing lever are raised. A lifting rod is bridged over the tips of both operating plates, and the lifting rod is arranged between the adhesive surface and the sheet-like object. Therefore, as the tip of the operating plate rises, the lifting rod also rises, whereby the sheet-like material is peeled off from the adhesive surface.

In Patent Document 2, the lower paper coated with ink is fixedly held on the base plate, and the upper paper of the translucent film sheet is fixedly held on the upper plate having openings and elongated holes, respectively. A magic memo device is disclosed that can erase the display of desired characters and patterns by peeling the crimp between the lower paper and the upper paper by a sliding member interposed in the upper paper.

Jikkensho 46-25522 Jitsukaisho 49-85228

In the pressure-sensitive copying board disclosed in Patent Document 1, the sheet-like material is peeled off from the adhesive surface by using a lifting rod arranged between the adhesive surface and the sheet-like material. Therefore, the sheet-like material is peeled off at the time of this peeling. A relatively large gap is created between the surface and the adhesive surface. Therefore, there is a risk that foreign matter such as dust may enter through the gap between the widely opened sheet-like object and the adhesive surface and adhere to the adhesive surface. When foreign matter adheres to the adhesive surface, the foreign matter hinders the adhesion between the sheet-like material and the adhesive surface, which may reduce the visibility of the handwriting. Further, when the sheet-like material is peeled off from the adhesive surface, it takes time for the handwriting to be completely erased from the side where the erasing mechanism is provided to the opposite side.

Further, in the magic memo device disclosed in Patent Document 2, it is necessary to slide the sliding member between the lower paper and the upper paper when erasing the displayed characters and patterns. In this case, since the sliding member rubs against the lower paper and the upper paper, the adhesive force on the surface of the lower paper may decrease due to repeated use of the magic memo device, and the stability of recording characters and patterns may decrease. is there.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a writing board capable of suppressing the invasion of foreign substances and erasing an image in a short time. Another object of the present invention is to provide a writing board capable of suppressing a decrease in stability of image recording when used repeatedly.

The writing board according to the present invention
It has a first sheet having an adhesive layer and a second sheet having a mat surface facing the adhesive layer, and the adhesive layer and the mat surface are brought into close contact with each other to bring the adhesive layer and the mat surface into contact with each other. An image is recorded on the close contact portion, and by bending the first sheet and the second sheet together, the adhesive layer and the matte surface in the close contact portion are peeled off from each other and the image is erased. A writing board including a base member to which the writing sheet can be fastened.
The writing sheet has a fastening portion and a grip portion, and is attached to the base member at the fastening portion.
With the writing sheet attached to the base member, both the first sheet and the two sheets can be bent.

In the writing board according to the present invention, a fingertip contact portion may be provided on the grip portion of the writing sheet.

In the writing board according to the present invention, the writing sheet may be detachably attached to the base member.

The writing board according to the present invention may include a cover member that protects the surface of the writing sheet, and the cover member may be continuously provided to the base member.

According to the present invention, it is possible to provide a writing board capable of suppressing the invasion of foreign matter and erasing an image in a short time. Further, according to the present invention, it is possible to provide a writing board capable of suppressing a decrease in stability of image recording when repeatedly used.

FIG. 1 is a diagram for explaining one embodiment according to the present invention, and is a plan view showing an example of a writing board. FIG. 2 is a cross-sectional view showing an example of a writing sheet. FIG. 3 is a cross-sectional view showing an example of the first sheet and the second sheet of the writing sheet. FIG. 4 is a vertical cross-sectional view taken along the line AA for explaining the state of writing on the writing board of FIG. FIG. 5 is a vertical cross-sectional view taken along the line AA for explaining a state of erasing an image on the writing board of FIG. FIG. 6 is a vertical cross-sectional view taken along the line AA for explaining a state of attachment / detachment of the writing sheet in the writing board of FIG. FIG. 7 is a cross-sectional view showing a modified example of the first sheet and the second sheet of the writing sheet.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, the scale, the aspect ratio, etc. are appropriately changed from those of the actual product and exaggerated for the convenience of illustration and comprehension.

In addition, in this specification, the terms "sheet", "board", and "film" are not distinguished from each other based only on the difference in designation. For example, "sheet" is a concept that includes members that can be called "plates" or "films".

Further, the "sheet surface (plate surface, film surface)" is a target sheet-like member (plate-like) when the target sheet-like (plate-like, film-like) member is viewed as a whole and from a broad perspective. A surface that coincides with the plane direction of a member or film-like member). Further, the normal direction used for the sheet-shaped (plate-shaped, film-shaped) member refers to the normal direction with respect to the sheet surface (plate surface, film surface) of the member.

In addition, as used in this specification, the terms such as "parallel", "orthogonal", and "identical" and the values of length and angle, etc., which specify the shape and geometric conditions and their degrees, are strictly defined. Without being bound by meaning, we will interpret it including the range in which similar functions can be expected.

1 to 7 are diagrams for explaining one embodiment according to the present invention. Of these, FIG. 1 is a plan view showing an example of the writing board 1, FIG. 2 is a cross-sectional view showing an example of the writing sheet 10, and FIG. 3 is a cross-sectional view of the first and second sheets of the writing sheet 10. It is sectional drawing which shows an example.

The writing board 1 includes a writing sheet 10 capable of recording and erasing the image 5, and a base member 60 capable of fastening the writing sheet 10. The writing sheet 10 includes a first sheet 30 and a second sheet 50, and has a fastening portion 61 and a grip portion 62.
In the writing board 1 of the present embodiment, a fingertip contact portion 63 is provided on the grip portion 62 of the writing sheet 10, and the writing sheet 10 is fastened by the fastening means 64 provided on the base member 60. The portion 61 is detachably attached to the base member 60, and the base member 60 is continuously provided with a cover member 70 that protects the surface of the writing sheet 10.

[Writing sheet]
The writing sheet 10 will be described in detail below.
The writing sheet 10 includes a first sheet 30 and a second sheet 50. The first sheet 30 has an adhesive layer 37, and the second sheet 50 has a matte surface 52a facing the adhesive layer 37. In the initial state before recording the image 5, the writing sheet 10 is not in close contact with the first sheet 30 and the second sheet 50, and an air layer is formed between the first sheet 30 and the second sheet 50. Exists. When recording the image 5, the desired portion is pressed from above the second sheet 50. The first sheet 30 and the second sheet 50 are in close contact with each other directly under the pressurized portion. In particular, the adhesive layer 37 of the first sheet 30 and the matte surface 52a of the second sheet 50 are in close contact with each other. As a result, the air layer existing between the first sheet 30 and the second sheet 50 is substantially eliminated, and the refractive index of light on the matte surface 52a of the second sheet 50 changes. As a result, the refractive index of light on the matte surface 52a of the unpressurized portion and the refractive index of light on the matte surface 52a of the pressurized portion become different from each other, and the contrast between the unpressurized portion and the pressurized portion becomes different. The image 5 is recorded on the writing sheet 10 due to the occurrence of. Generally, in the pressurized portion, the color of the first sheet 30 can be recognized from the upper part of the second sheet 50. The method of pressurizing is arbitrary, such as a method of pressurizing in a character shape with a pen 7 made of a resin material or the like to form a handwriting, a method of pressing a relief such as a stamp to transfer a pattern formed on the relief, and the like. Is included. Then, when the second sheet 50 is peeled off from the first sheet 30, an air layer is generated again between the first sheet 30 and the second sheet 50, and the image 5 is erased. In the present embodiment, as will be described later, by bending both the first sheet 30 and the second sheet 50, the adhesive layer 37 and the matte surface 52a at the close contact portion are peeled off from each other, and the image 5 is erased. In this way, in the writing sheet 10 according to the present embodiment, the recording and erasing of the image 5 can be repeated.

The configuration of the writing sheet 10 of the present embodiment will be described in detail below. In the example shown in FIG. 2, the writing sheet 10 has a back surface side laminate 20 and a front surface side laminate 40. The back-side laminate 20 includes a first sheet 30, a back cover film 22, and an adhesive layer 24 that fixes the first sheet 30 and the back cover film 22 to each other. The front side laminated body 40 includes a second sheet 50, a front cover film 42, and an adhesive layer 44 that fixes the second sheet 50 and the front cover film 42 to each other. The writing sheet 10 has a first surface 10a and a second surface 10b facing the opposite side of the first surface 10a. In the example shown in FIG. 2, the second surface 10b is a surface that the pen, relief, or the like comes into contact with when the image 5 is recorded on the writing sheet 10. In the present specification, the first surface 10a may be referred to as "back surface" and the second surface 10b may be referred to as "front surface". Further, in the writing sheet 10, the side close to the first surface 10a along the normal direction of the writing sheet 10 is referred to as "back side", and the side close to the second surface 10b is referred to as "front side". There is. Further, of the first surface 10a and / or the second surface 10b, the portion where the adhesive layer 37 of the first sheet 30 and the matte surface 52a of the second sheet 50 are in close contact with each other and can be visually recognized from the outside as an image is a “writing surface”. May be called.

The back cover film 22 is a film-like member that protects the first sheet 30 and the second sheet 50 from the back side. In the present embodiment, the back cover film 22 forms the first surface 10a of the writing sheet 10. The adhesive layer 24 has a function of fixing the first sheet 30 and the back cover film 22 to each other. The material of the back cover film 22 is not particularly limited, but for example, a resin material can be used. The material of the adhesive layer 24 is also not particularly limited, but various adhesives and adhesives can be used. In the present embodiment, the back cover film 22 and the adhesive layer 24 are formed of a material having light transmission, but the back cover film 22 and the adhesive layer 24 do not require light transmission.

The front cover film 42 is a film-like member that protects the first sheet 30 and the second sheet 50 from the front side. In the present embodiment, the front cover film 42 forms the second surface 10b of the writing sheet 10. The adhesive layer 44 has a function of fixing the second sheet 50 and the front cover film 42 to each other. The front cover film 42 and the adhesive layer 44 pass through the front cover film 42 and the adhesive layer 44 to form an image 5 formed by a portion in which the matte surface 52a of the second sheet 50 and the adhesive layer 37 of the first sheet 30 are in close contact with each other. It is made of a light-transmitting material so that it can be visually recognized. The material of the front cover film 42 is not particularly limited, but for example, a resin material having light transmission can be used. The front cover film 42 receives a force from the pen 7 or the relief along the normal direction of the writing sheet 10 when recording the image 5 on the writing sheet 10. Further, especially when the image 5 is recorded by using the pen 7, the front cover film 42 is scraped by the pen tip of the pen 7 along the sheet surface of the writing sheet 10. Therefore, it is desirable that the front cover film 42 is made of a material having sufficient durability against the force received from the pen 7 or the relief and the scraping by the pen 7. The material of the adhesive layer 44 is not particularly limited, but various adhesives and adhesives having light transmittance can be used.

In the example shown in FIG. 2, the back cover film 22 and the front cover film 42 are formed by the adhesive layer 24 and the adhesive layer 44 at both ends of the writing sheet 10 along the sheet surface (the left and right ends in FIG. 2). Are fixed to each other. In the present embodiment, when viewed from the normal direction of the writing sheet 10, that is, in a plan view, the writing sheet 10 has a rectangular shape having a pair of opposite sides, and the back cover film 22 has a pair of opposite sides. And the front cover film 42 are fixed to each other, and the back cover film 22 and the front cover film 42 are not fixed to each other on the opposite side.

Next, the first sheet 30 and the second sheet 50 will be described. The first sheet 30 used in the present invention includes an adhesive layer 37. In particular, in the present embodiment, the first sheet 30 has a support 31 having a colored layer 32 and an adhesive layer 37 facing the second sheet 50. The colored layer 32 is not an essential configuration in the first sheet 30. The adhesive layer 37 is a layer that comes into close contact with the second sheet 50 during image recording, and by making close contact with the adhesive layer 37, for example, the color of the support 31 can be observed via the second surface (front surface) 10b of the writing sheet 10. ..

The adhesive layer 37 is formed on at least one surface of the support 31. By providing adhesive layers 37 on both side surfaces of the support 31 and combining the two second sheets 50 facing each surface, a writing sheet 10 that can be recorded on both the front surface and the back surface can be obtained. ..

Here, the support 31 is not particularly limited, but it needs to be colored in order to maintain high contrast of the image observed from the surface of the writing sheet 10 at the time of image recording. Further, in order to physically impart sufficient strength to the writing sheet 10, the support 31 is also required to have strength.

From this point of view, as shown in FIG. 3, in one embodiment, a support 31 having a base material layer 33 and a colored layer 32 can be used. By using the base material layer 33 having a physically sufficient strength, it is possible to select various colored layers 32 according to cost and color. At this time, the base material layer 33 preferably has sufficient physical strength, and can be selected from any conventionally known material. For example, it can be selected from a polyolefin resin and a polyester resin. More specifically, (i) as the polyolefin resin base material, polyethylene (PE) resin, polypropylene (PP) resin, ethylene-propylene copolymer, ethylene. -From among butene copolymers and the like, the (ii) polyester resin can be selected from polyethylene terephthalate (PET) resin, polybutylene terephthalate (PBT) resin, polyethylene naphthalate resin, polybutylene naphthalate resin and the like. Of these, polyester-based resins are preferable, and PET resins are particularly preferable from the viewpoint of strength and processability. The support 31 may be composed of only the colored layer 32.

The surface of these base material layers 33 is subjected to conventionally known surface treatments such as corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, and application of an undercoat agent (formation of an undercoat layer). May be good.

The thickness of the base material layer 33 is not particularly limited, but is preferably 50 to 250 μm in order to achieve physically sufficient strength. These base material layers 33 may be colorless and transparent, colored transparent, or opaque. When the base material layer 33 is colorless and transparent, it is preferably laminated with the colored layer 32. In any case, the support 31 is preferably opaque as a whole. In addition, opaque in the present invention means that the transmittance is less than 80%, preferably less than 60% over the entire wavelength region of 400 to 760 nm. On the other hand, colorless and transparent means that the transmittance is 80% or more, preferably 90% or more over the entire wavelength region. Further, colored transparency means that a part of the wavelength region has a transmittance of less than 80%. In this specification, the numerical range indicated by using "~" shall include the numerical values at both ends thereof. For example, "50 to 250 μm" means "50 μm or more and 250 μm or less".

When the colored layer 32 is used to make the support 31 opaque, the colored layer 32 may be made by bonding a colored sheet-like material or the like to the transparent base material layer 33, or the transparent base material. The colored layer 32 may be applied to the surface of the layer 33 to form the layer 33.

Examples of the colored sheet-like material include colored paper, a dyed resin base material, a base material made of a resin material in which colored particles are dispersed, and a colored fiber aggregate. When the colored layer 32 is formed by coating, a composition containing a binder in which colored particles are dispersed can be applied and further dried or cured to form the colored layer 32. Examples of the colored particles include inorganic pigment particles, metal powder, and metal oxide powder.

As the support 31, a metal plate or a support 31 having a metal layer as the colored layer 32 can also be used. When such a metal-like surface is used for the support 31, a special effect can be obtained. In this case, the contrast of the image obtained by writing is relatively low. However, when the recorded image is copied by a copying machine, a high-contrast image is copied. By using such an effect, the effect of a watermark can be obtained.

The surface on the front surface side of the support 31 is preferably highly smooth. An adhesive layer 37 is provided on the surface as described later, but since it is preferable that the surface of the adhesive layer 37 is finally smooth, the surface on the front surface side of the support 31 as a base thereof is provided. It is also preferable that the smoothness is high. From this point of view, it is preferable that the front surface of the support 31 is a resin base material layer 33. Therefore, when the support 31 has a structure in which the base material layer 33 and the colored layer 32 are laminated, the colored layer 32 is on the side opposite to the surface on which the second sheet 50 faces, as shown in FIG. It is preferably formed on the surface.

The first sheet 30 includes an adhesive layer 37. Prior to forming the adhesive layer 37 on the surface of the first sheet 30, an intermediate layer 35 can be provided in order to improve the adhesiveness between the support 31 and the adhesive layer 37. When the writing sheet 10 is used, the adhesive layer 37 and the second sheet 50 are repeatedly adhered to and peeled off, so that the adhesive layer 37 may be peeled off from the surface of the first sheet 30. By providing the intermediate layer 35, the writing sheet 10 may be peeled off. Such a problem can be improved, and the storage stability of the writing sheet 10 can also be improved.

Examples of the material used for the intermediate layer 35 include various resins such as polyester resin, acrylic resin, polyurethane resin, acrylic graft polyester resin, and silicone resin. The intermediate layer 35 can be formed of, for example, a polyester resin. By increasing the thickness of the intermediate layer 35, the adhesiveness between the support 31 and the adhesive layer 37 can be improved, and by reducing the thickness, the color of the support 31 can be easily reproduced at the time of image recording. From such a viewpoint, the thickness of the intermediate layer 35 is preferably 0.05 to 1.0 μm.

In the first sheet 30 used in the present invention, the adhesive layer 37 is formed on the surface of the support 31 directly or on the surface via the intermediate layer 35. An image is recorded by the adhesive layer 37 coming into close contact with the second sheet 50 at the time of image recording. Therefore, from the viewpoint of image recording stability, it is preferable that the adhesive strength is high, but if it is excessively high, it becomes difficult to peel off the second sheet 50 at the time of erasing, or an unpleasant sound is generated at the time of peeling. Or, the adhesive layer 37 or the second sheet 50 may be damaged. Further, even though the writing sheet 10 is left unattended, the second sheet 50 and the adhesive layer 37 may come into close contact with each other, and an unintended image may be recorded. Therefore, the adhesive strength of the adhesive layer 37 is preferably 1.0 to 5.0 N / m, and more preferably 1.5 to 4.0 N / m. Here, the adhesive strength can be measured according to the 180 ° peeling adhesive strength measurement with respect to the test plate shown in JIS Z 0237 Method 1.

In general, such an adhesive layer 37 is mixed with a pressure-sensitive adhesive composition, if necessary, such as a catalyst, and then passed through an intermediate layer 35 to the support 31 or the base material layer 33, if necessary. It is formed by applying and reacting by heating or the like.

As the material of the pressure-sensitive adhesive layer 37, any conventionally known pressure-sensitive adhesive can be selected.

Examples of such adhesives include acrylic adhesives, rubber adhesives, polyester adhesives, urethane adhesives, polyether adhesives, silicone adhesives, polyamide adhesives, fluorine adhesives and the like. Various adhesives can be mentioned.

Of these, the silicone-based pressure-sensitive adhesive is mainly composed of a polymer whose main skeleton is mainly composed of siloxane bonds. Many silicone-based adhesives exhibit appropriate adhesiveness, and are preferable because they are excellent in chemical resistance, water resistance, and heat resistance. Further, it is also preferable that the silicone-based pressure-sensitive adhesive has a small change in adhesive strength due to pressure. The urethane adhesive is mainly composed of a polymer obtained by condensing an isocyanate compound and a hydroxy compound. It is a preferable adhesive because it has excellent peelability, but its adhesive strength is often higher than that of silicone-based adhesives, and it may be necessary to adjust the adhesiveness. Further, when a urethane-based pressure-sensitive adhesive is used, the adhesive strength between the second sheet 50 and the pressure-sensitive adhesive layer 37 tends to change depending on the pressure applied during image recording. Therefore, when the uniformity of the force required for peeling the second sheet 50 and the uniformity of the contrast of the recorded image are important, it is preferable to use a silicone-based adhesive.

Various adhesives used in such a method are commercially available, and a suitable adhesive can be selected and used from them. Specifically, as silicone-based adhesives, LTC755, SD4580PSA, etc. (all sold by Toray Dow Corning Co., Ltd.), KR3700, KR3701, KR3704 (all sold by Shinetsu Chemical Industry Co., Ltd.) ), Examples of the catalyst to be combined with this include NC-25 Catalyst (trade name, sold by Toray Dow Corning Co., Ltd.) and CAT-PL-50T (trade name, sold by Shin-Etsu Chemical Industry Co., Ltd.). .. Examples of urethane adhesives include Siavine series SH-101M, SH-101, and SP-205 (trade names, all sold by Toyochem Co., Ltd.), and Siavine T501B (polyfunctional isocyanate) is used as a catalyst to be combined with the urethane adhesive. System cross-linking agent) (trade name, sold by Toyochem Co., Ltd.).

As the catalyst to be combined with the silicone-based pressure-sensitive adhesive, a noble metal catalyst containing platinum is preferable because the cross-linking density can be adjusted, and platinum-ruthenium alloy, platinum-palladium alloy, platinum-titanium alloy and the like are particularly preferably used.

The method of applying the pressure-sensitive adhesive composition is not particularly limited, and for example, a conventionally known coater such as a gravure roll coater, a die coater, or a bar coater can be used. Alternatively, the pressure-sensitive adhesive composition may be applied by impregnation, a curtain coating method, or the like.

After coating, heating is preferable in order to promote the cross-linking reaction and improve the production efficiency. The heating temperature is generally selected from the range of 40 to 150 ° C, preferably 60 to 130 ° C.

The thicker the adhesive layer 37 is, the easier it is to adhere to the second sheet 50, and the thinner the adhesive layer 37 is, the easier it is to reproduce the color of the support 31 at the time of image recording, and the lower the production cost. Therefore, the thickness of the adhesive layer 37 is preferably 5 to 30 μm, more preferably 10 to 20 μm. Further, the surface of the adhesive layer 37 is preferably smooth.

The adhesive layer 37 may be colored. By making the color of the support 31 and the color of the adhesive layer 37 different from each other, it is possible to record an image with a color synthesized by the color of the adhesive layer 37 and the color of the support 31. Further, by making the color of the support 31 and the color of the adhesive layer 37 the same, an image is recorded with a higher density by combining the color density of the adhesive layer 37 and the color density of the support 31. Will be possible. Furthermore, the adhesive layer 37 can be provided with the function of a colored layer. That is, by imparting a high concentration of color to the adhesive layer 37, it is possible to omit providing the colored layer 32 separately.

The second sheet 50 used in the present invention needs to be able to observe the color of the first sheet 30 from the surface of the writing sheet 10 when it is in close contact with the adhesive layer 37. Therefore, it is necessary to use a light-transmitting second sheet as the second sheet 50. Here, the light-transmitting second sheet means a sheet in which the color or pattern of the support 31 underneath can be identified from the upper surface. Generally, it is preferable that the second sheet 50 is colorless and transparent. Since the second sheet 50 has a high transmittance over the entire wavelength range of 400 to 760 nm, it is possible to record an image faithful to the coloring applied to the first sheet 30. However, it is also possible to color the second sheet 50. By using the base material 54 which is transparent in a part of the wavelength range of 400 to 760 nm, it is possible to record an image with a color different from the color applied to the first sheet 30. Further, by including the metallic pigment in the second sheet 50, a characteristic color expression may be possible.

Such a second sheet 50 is generally provided with a transparent base material 54. Since the second sheet 50 is required to have not only transparency but also physical strength, the base material 54 made of the material exemplified in the support 31 described above is preferably used. When the second sheet 50 is colored, a colored layer can be laminated on such a transparent base material 54. The colored layer in this case is independent of the colored layer 32 included in the support 31.

In the present invention, a matte surface 52a is formed on the back surface of the second sheet 50. The characteristics of the writing sheet 10 greatly vary depending on the surface shape of the matte surface 52a.

In the writing sheet 10 according to the present invention, if the arithmetic average height Sa of the matte surface 52a is large, matte expression becomes easy, and even if the writing sheet 10 is left unattended, the second sheet 50 and the adhesive layer 37 are in close contact with each other. It is less likely to be lost, and if Sa is small, an image with high contrast tends to be recorded. From such a viewpoint, in the present invention, the arithmetic average height Sa of the mat surface 52a is 0.10 to 0.50 μm, preferably 0.15 to 0.30 μm.

The arithmetic mean height Sa can be measured by a three-dimensional roughness meter. Specifically, a laser microscope Lext-OLS4100 (trade name, manufactured by Olympus Corporation) can be used for these measurements.

Further, the unevenness existing on the matte surface 52a prevents the adhesive layer 37 and the second sheet 50 from coming into close contact with each other in the state before the image recording, and also prevents the adhesive layer 37 and the second sheet 50 from coming into close contact with each other during the image recording. The adhesion between the two is properly maintained, and the image can be easily peeled off when the image is erased. In order to obtain such a matte surface 52a, the haze value is preferably 70 to 95%. The haze value can be measured with a haze meter TC-HIII (trade name: manufactured by Tokyo Denshoku Co., Ltd.).

The method of forming the matte surface 52a on the back surface of the second sheet 50 is not particularly limited, but a method of directly engraving the surface of the base material 54, which is the main structure of the second sheet 50, and unevenness are formed. A method of laminating with a base material having the material, a method of applying a resin composition in which fine particles are dispersed to the surface of the base material and drying or curing to form an uneven surface, a method containing a compound that generates bubbles by heating, etc. Examples thereof include a method of applying to the surface of a base material and causing bubbles to be generated in the composition layer by heating or the like to form irregularities on the surface. Further, as the base material 54, the second sheet 50 having the matte surface 52a formed on the surface can also be obtained by molding the resin composition in which the fine particles are dispersed into the base material.

Of these, it is preferable to use a resin composition in which fine particles are dispersed because the roughness of the matte surface 52a can be easily controlled. In particular, a method in which a resin composition in which highly transparent fine particles such as silica are dispersed is applied to the surface of the base material 54 and heated to cure the resin is a method in terms of quality stability and characteristics of the cover base material. It is preferably adopted. The fine particles may be an organic material or an inorganic material. Examples of the organic material used for the fine particles include acrylic resins such as polymethylmethacrylate, polystyrene, styrene-acrylic resin, polycarbonate resin, urethane resin, epoxy resin, polyester resin, and polyester urethane resin. Examples of the inorganic material used for the fine particles include silicon dioxide (silica), titanium dioxide, barium sulfate, calcium carbonate, talc, mica, metal flakes, and metal oxide flakes. Of these, when mica, metal flakes, or metal oxide flakes are used in particular, the color generated during image recording becomes a metallic color, and a beautiful image is recorded. In this case, it is preferable to make the colored layer 32 a high-density color, typically black, because the contrast is increased and the metallic color is observed more beautifully.

The average particle size of these fine particles is preferably 0.05 to 5.0 μm. Here, the average particle size is measured on a volume basis by a laser diffraction method (principle), and can be measured by, for example, MICROTRAC9320-X100 (manufactured by Honeywell).

Examples of the resin used as the binder of the composition include vinyl chloride vinyl acetate copolymer resin, epoxy resin, acrylic resin, polyester resin, urethane resin, and melamine resin. Among these, acrylic melamine resin, polyester melamine resin, acrylic urethane resin and the like are considered to be excellent in terms of physical strength and optical characteristics, and are preferably used.

Further, examples of the solvent for dissolving or dispersing these include toluene and methyl ethyl ketone.

FIG. 3 shows a structure in which a mat layer 52 having a mat surface 52a is laminated on the back surface of the base material 54 by any method.

Further, there are a physical method and a chemical method as a method of directly engraving the surface of the base material 54. Of these, the physical method is preferable because the process is relatively simple and finer irregularities can be formed. Examples of the method of physically engraving the surface of the base material include a sandblast method and a scratch method.

In the present invention, the hardness of the matte surface 52a of the second sheet 50 is preferably high. Specifically, the pencil hardness (JIS K 5600-5-4) is preferably F or more, and more preferably H or more. According to the study by the present inventors, when an image is recorded and then erased on the writing sheet 10, traces of the image may remain on the second sheet 50. As a result, the contrast of the image recorded thereafter is lowered. However, in the present invention, by appropriately setting the hardness of the matte surface 52a, such a problem is improved and such a decrease in contrast is suppressed. Further, the adhesiveness between the second sheet 50 and the adhesive layer 37 becomes appropriate, and the recording and erasing of the image can be facilitated.

In the present embodiment, the second sheet 50 is provided with the protective layer 56 on the surface opposite to the surface on which the mat surface 52a is formed. In the present embodiment, the protective layer 56 is not an essential configuration, and the protective layer 56 can be omitted.

The thickness of the second sheet 50 is thin enough to achieve sufficient light transmission, preferably high transparency, and to transfer the pressure during image recording to the interface between the second sheet 50 and the adhesive layer 37. It is preferable that the material is thick in order to increase the physical strength. From such a viewpoint, the thickness of the main base material 54 constituting the second sheet 50 is preferably 38 to 100 μm, and more preferably 50 to 75 μm. When the mat layer 52 is provided, the mat layer 52 is preferably thick in order to obtain the desired surface roughness, and the mat layer 52 is preferably thin in order to maintain the transparency of the second sheet 50. .. From such a viewpoint, the thickness of the mat layer 52 is preferably 2 to 20 μm, more preferably 5 to 10 μm. When the protective layer 56 is provided, the thickness of the protective layer 56 is preferably 0 to 100 μm, more preferably 25 to 50 μm.

[Standing part and grip part]
The fastening portion 61 and the grip portion 62 will be described in detail below.
The writing sheet 10 has a fastening portion 61 and a grip portion 62. If the fastening portion 61 and the grip portion 62 can bend both the first sheet 30 and the second sheet 50 of the writing sheet 10 by bringing the fastening portion 61 and the grip portion 62 close to each other, writing is performed. It can be provided at any position on the sheet 10. A plurality of fastening portions 61 and grip portions 62 may be provided.
In the present embodiment, when viewed from the normal direction of the writing sheet 10, that is, in a plan view, the writing sheet 10 has a rectangular shape, and the fastening portion 61 and the grip portion 62 are the writing sheet 10. It is provided so as to face each other across the rectangular writing surface 3.
When the fastening portion 61 and the grip portion 62 are provided so as to face each other with the writing surface 3 sandwiched between them, the fastening portion 61 and the grip portion 62 are brought close to each other, so that the entire writing surface 3 of the writing sheet 10 is flexed. Therefore, the images recorded on the writing surface 3 can be efficiently erased at once, which is preferable.

The writing sheet 10 is attached to the base member 60 at the fastening portion 61, and in a state where the writing sheet 10 is attached to the base member 60, both the first sheet 30 and the second sheet 50 of the writing sheet 10 can be bent. It is possible.
In the present embodiment, the fastening portion 61 is a through hole formed in the sheet surface of one side (upper end portion in FIG. 1) of the writing sheet 10, and the base member 60 is a method of the sheet surface of the writing sheet 10. It is a plate-shaped member having a substantially rectangular contour when viewed from the linear direction. The writing sheet 10 is arranged on the base member 60, and the writing sheet 10 is a fastening portion 61 and is located on one side of the base member 60. A hole is bound to the base member 60 by a fastening means 64 arranged at an end portion (upper end portion in FIG. 1) on the surface.
The shape of the fastening portion 61 is not particularly limited as long as the writing sheet 10 can be attached to the base member 60 by the fastening portion 61.
Further, the method of attaching the writing sheet 10 to the base member 60 by the fastening portion 61 is not particularly limited, and for example, adhesion by an adhesive, adhesion by an adhesive, adhesion between adhesive members, and the like. , Welding by heat, ultrasonic waves, laser, etc., fitting of members, etc. can be appropriately selected. Further, a plurality of the above mounting methods may be combined.

The grip portion 62 of the writing sheet 10 is a portion that can be gripped by the user. For example, one side of the writing sheet 10 is used as the grip portion 62, and the user hands on the first surface (back surface) 10a side of the writing sheet 10. The grip portion 62 can be gripped by the thumb and the index finger by touching the second surface (front surface) 10b side of the writing sheet 10 with the index finger of the hand.
The shape of the grip portion 62 is not particularly limited as long as the user can grip it by hand.
In the present embodiment, one side (lower end portion in FIG. 1) of the writing sheet 10 is the grip portion 62, and the writing sheet 10 has both end portions (upper end portion and lower end portion in FIG. 1) along the sheet surface of the writing sheet 10. The back cover film 22 and the front cover film 42 are fixed to each other.
With such a configuration, when the fastening portion 61 and the grip portion 62 are brought close to each other, that is, when the writing sheet 10 is bent so as to bend toward the front side laminated body 40 side, as will be described later. In the region between both ends where the back-side laminate 20 and the front-side laminate 40 are fixed to each other, the strain (force) generated in the front-side laminate 40, which is the inside of the bending, does not escape, thereby causing the strain (force) to escape. A gap is formed between the back-side laminate 20 and the front-side laminate 40, and the adhesive layer 37 of the first sheet 30 of the back-side laminate 20 and the matte surface 52a of the second sheet 50 of the front-side laminate 40 Is peeled off from each other, and the image 5 formed at the portion where the adhesive layer 37 and the matte surface 52a are in close contact with each other is erased. Therefore, the erasability of the image 5 recorded on the writing sheet 10 is excellent.

A grip portion 62 is formed by forming a part of the writing sheet 10 in the shape of a tongue piece or by coupling a tongue piece-shaped knob to the writing sheet 10 to improve the gripability of the grip portion. You can also do it.
Further, a part of the writing sheet 10 (thickness in the normal direction) is formed to be thicker, and a member having a thickness larger than the thickness of the writing sheet 10 (thickness in the normal direction) is coupled to the writing sheet 10. By doing so, the grip portion 62 can be formed to improve the gripability of the grip portion.
Furthermore, the gripability of the grip portion 62 can be improved by providing irregularities on the surface of the grip portion 62 and by subjecting the surface of the grip portion 62 to embossing or satin finish.

Next, recording and erasing of the image 5 of the writing sheet 10 on the writing board 1 of the present embodiment will be described with reference to FIGS. 4 and 5.
FIG. 4 is a vertical cross-sectional view taken along the line AA for explaining the state of writing on the writing board 1, and FIG. 5 is a vertical cross-sectional view taken along the line AA for explaining the state of erasing the image 5 on the writing board 1. Is. In FIGS. 4 and 5, the back surface side laminate 20 and the front surface side laminate 40 are shown in simplified cross sections, respectively. Further, in FIG. 5, the writing sheet 10 before bending is shown by a alternate long and short dash line. The writing sheet 10 before bending shown by the alternate long and short dash line in FIG. 5 corresponds to the writing sheet 10 shown in FIG.

When recording an image on the writing sheet 10, as shown in FIG. 4, a pen 7 or the like is used, and the second sheet 50 is desired via the second surface (front surface) 10b of the writing sheet 10. Pressurize the part. As a result, the first sheet 30 and the second sheet 50 come into close contact with each other directly under the pressurized portion. In particular, in the present embodiment, the adhesive layer 37 of the first sheet 30 and the matte surface 52a of the second sheet 50 are in close contact with each other. As a result, the air layer existing between the first sheet 30 and the second sheet 50 is substantially eliminated, and the refractive index of light on the matte surface 52a of the second sheet 50 changes. As a result, the refractive index of light on the matte surface 52a of the unpressurized portion and the refractive index of light on the matte surface 52a of the pressurized portion become different from each other, and the contrast between the unpressurized portion and the pressurized portion becomes different. The image 5 is recorded on the writing sheet 10 due to the occurrence of. Generally, in the pressurized portion, the color of the first sheet 30 can be recognized from the upper part of the second sheet 50.
When the first sheet 30 does not have the colored layer 32, the writing sheet 10 is arranged on the colored base member 60, and the image 5 is recorded on the writing sheet 10 to obtain the adhesive layer 37 and the mat. The color of the colored base member 60 becomes visible at the portion in close contact with the surface 52a. Further, as another example, when the first sheet 30 does not have the colored layer 32, a colored film may be used as the back cover film 22.

When erasing the image 5 recorded on the writing sheet 10, as shown in FIG. 5, the user manually grips the grip portion 62 of the writing sheet 10 to hold the first sheet 30 and the second sheet 30 and the second. Bend the sheet 50 together.
In the illustrated example, the back cover film 22 and the front cover film 42 are fixed to each other by the adhesive layer 24 and the adhesive layer 44 at both ends (the left and right ends in FIG. 5) along the sheet surface of the writing sheet 10. Has been done. That is, at both ends, the back surface side laminate 20 and the front surface side laminate 40 are fixed to each other.
Further, in the illustrated example, the fastening portion 61 is provided at the right end portion of the writing sheet 10, and the fastening portion 61 is attached to the base member 60 by the fastening portion 61, so that the fastening portion 61 is a fulcrum. Therefore, when the user grips the grip portion 62 provided at the left end portion of the writing sheet 10 by hand and lifts it upward, the writing sheet 10 is held so that the fastening portion 61 and the grip portion 62 come close to each other. Can be bent.
In FIG. 5, the writing sheet 10 is bent so as to bend toward the front side laminated body 40 side, but the present invention is not limited to this, and the writing sheet 10 is bent so as to bend toward the back side laminated body 20 side. You may not.

As shown in FIG. 5, when the writing sheet 10 is bent so as to bend toward the front side laminated body 40 side, the back side laminated body 20 and the front side laminated body 40 are fixed to each other. In the region between both ends, the strain (force) generated in the front side laminated body 40 that is inside the bending does not escape, so that a gap is created between the back side laminated body 20 and the front side laminated body 40. At this time, the adhesive layer 37 of the first sheet 30 of the back-side laminated body 20 and the matte surface 52a of the second sheet 50 of the front-side laminated body 40 are separated from each other. As a result, the image 5 formed at the portion where the adhesive layer 37 and the matte surface 52a are in close contact with each other is erased.

In this way, when the back cover film 22 and the front cover film 42 are fixed to each other at both ends along the sheet surface of the writing sheet 10, the erasability of the image 5 recorded on the writing sheet 10 is improved. preferable.

On the other hand, it is not an essential configuration that the back cover film 22 and the front cover film 42 are fixed to each other at both ends. As a result of the present inventors studying such a writing sheet 10, the first sheet 30 and the second sheet 50 are found even if the back cover film 22 and the front cover film 42 are not fixed to each other at both ends. It was found that the image 5 recorded on the writing sheet 10 can be erased by bending the two together.

Regarding this mechanism, the inventors speculate that either (1) and (2) below, or both (1) and (2) below occur.
(1) By bending both the first sheet 30 and the second sheet 50, the non-adhesive portion between the adhesive layer 37 of the first sheet 30 and the matte surface 52a of the second sheet 50 expands, thereby expanding. At the contact portion between the adhesive layer 37 and the mat surface 52a, the adhesive layer 37 and the mat surface 52a are peeled off from each other.
(2) By bending both the first sheet 30 and the second sheet 50, the strain (force) generated in the first sheet 30 and the second sheet 50 exceeds the adhesive force of the adhesive layer 37, whereby the adhesive layer 37 The adhesive layer 37 and the mat surface 52a are separated from each other at the contact portion between the surface and the mat surface 52a.

The above estimation does not limit the erasing mechanism of the image 5 when the back cover film 22 and the front cover film 42 are not fixed to each other at both ends along the sheet surface of the writing sheet 10. Absent. That is, the writing sheet 10 of the present embodiment and the method of erasing the image 5 in the writing sheet 10 include a method in which the image 5 is erased by another mechanism.

[Base member]
The base member 60 will be described in detail below.
The writing board 1 includes a base member 60. The base member 60 is a member to which the writing sheet 10 is fastened by the fastening portion 61. A plurality of base members 60 may be provided.
The shape of the base member 60 is not particularly limited as long as the writing sheet 10 can be fastened, and the writing is suitable for carrying by forming a shape that can be grasped by the user, such as a plate shape. It is preferable because it becomes the board 1.
In the present embodiment, the base member 60 is a plate-shaped member having a flat surface, and the writing sheet 10 is arranged on the base member 60.
With such a configuration, the base member 60 acts as a writing table. Therefore, when the writing sheet 10 is usually placed on a flat surface such as a desk and used, the writing sheet 10 is used even when standing or walking. Characters and images can be recorded on.

When the writing sheet 10 is arranged on the base member 60, the second surface (front surface) 10b of the writing sheet 10 is formed by increasing the smoothness of the surface of the base member 60 (the surface on the writing sheet 10 side). When a desired portion of the second sheet 50 is pressed through the writing sheet 10 to record characters and images, the adhesive layer 37 of the first sheet 30 and the matte surface of the second sheet 50 of the character portion and the image portion are recorded. Since 52a adheres only to the pressurized portion and adheres as it is pressurized, and does not adhere to the portion other than the pressurized portion, it is recorded clearly as a character or an image is drawn. It becomes a writing board 1 that can be written.
Further, when the writing sheet 10 is arranged on the base member 60, by forming fine irregularities on the surface of the base member 60 (the surface on the writing sheet 10 side), for example, by embossing or satin finish. When a desired portion of the second sheet 50 is pressed through the second surface (front surface) 10b of the writing sheet 10 and characters and images are recorded on the writing sheet 10, the first sheet of the character portion and the image portion is recorded. Since the adhesive layer 37 of 30 and the matte surface 52a of the second sheet 50 adhere to each other not only in the pressurized portion but also in the vicinity of the pressurized portion in the form of fine dots, the outline of characters and images is intentionally applied. It is a writing board 1 that can be blurred and can record characters and images as if they were drawn with a crayon or an air brush.
Further, when the writing sheet 10 is arranged on the base member 60, on the surface of the base member 60 (the surface on the writing sheet 10 side), for example, a stripe pattern, a lattice pattern, a dot pattern, a honeycomb pattern (honeycomb pattern) By forming a specific pattern-like unevenness such as a checkerboard pattern, a desired portion of the second sheet 50 is pressed through the second surface (front surface) 10b of the writing sheet 10 to form characters on the writing sheet 10. And / or when the image is recorded, the adhesive layer 37 of the first sheet 30 and the matte surface 52a of the second sheet 50 adhere to each other in the pattern portion and / or other than the pattern portion, so that the adhesive layer 37 and / or the matte surface 52a of the second sheet 50 adhere to each other according to the pattern shape. Since the image is recorded with contrast, for example, the recorded characters and images become a stripe pattern, a lattice pattern, a dot pattern, a honeycomb pattern, a checkered pattern, etc., and the writing board 1 has excellent design.
Furthermore, when the writing sheet 10 is arranged on the base member 60, the surface of the base member 60 (the surface on the writing sheet 10 side) is formed, for example, a pattern-like unevenness of a manga or anime character. When a desired portion of the second sheet 50 is pressed through the second surface (front surface) 10b of the writing sheet 10 and characters and images are recorded on the writing sheet 10, the adhesive layer 37 of the first sheet 30 And / or the matte surface 52a of the second sheet 50 are in close contact with each other except for the symbol portion and / or the symbol portion, so that contrast is generated according to the symbol shape and an image is recorded. Therefore, for example, characters and images can be recorded. As the recording progresses, the design of the character gradually emerges, and the writing board 1 has excellent design.

Further, when carrying the writing sheet 10 in which characters and images are recorded, if the writing sheet 10 is gripped and carried, the writing sheet 10 bends, and the first sheet 30 which is in close contact with the character portion and the image portion. The adhesive layer 37 and the matte surface 52a of the second sheet 50 may be separated from each other and the recorded characters and images may be erased. However, by providing the base member 60, the base member 60 can be gripped. Since the writing board 1 can be carried around, the writing sheet 10 is prevented from bending during carrying, and the characters and images recorded on the writing sheet 10 are effectively suppressed from being erased. Can be done. These are more effective when the bending rigidity of the base member 60 is larger than that of the writing sheet 10.
Furthermore, by providing the base member 60, it is possible to effectively prevent the writing sheet 10 from becoming dirty and the writing sheet 10 from being scratched, and the writing sheet 10 collides with something to write. It is possible to effectively prevent the characters and images recorded on the sheet 10 from being unintentionally erased. These are more effective when the base member 60 is larger than the writing sheet 10.

The material of the base member 60 is not particularly limited, and various materials such as paper, synthetic paper, cloth, wood, resin, metal, rubber, and elastomer can be selected. Specifically, paper, synthetic paper, cloth, wood, ABS resin, AS resin, polyamide resin, polycarbonate resin, polyethylene resin, polyethylene terephthalate resin, acrylic resin, polyacetal resin, polypropylene resin, polystyrene resin, silicone resin, fluororesin. Examples thereof include resins such as iron, cobalt, nickel, aluminum, and metals such as stainless steel, rubber, elastomers, glass, and ceramics. Further, a plurality of the above materials may be combined and formed.

The writing board 1 of the present embodiment has a first sheet 30 having an adhesive layer 37 and a second sheet 50 having a mat surface 52a facing the adhesive layer 37, and the adhesive layer 37 and the mat surface 52a are formed. The image 5 is recorded in the contact portion between the adhesive layer 37 and the mat surface 52a by being in close contact with each other, and the adhesive layer 37 and the mat surface 52a in the close contact portion are formed by bending the first sheet 30 and the second sheet 50 together. A writing sheet 10 that is peeled off from each other and the image 5 is erased, and a base member 60 that can fasten the writing sheet 10 are provided. The writing sheet 10 has a fastening portion 61 and a gripping portion 62, and stops. It is possible to bend both the first sheet 30 and the second sheet 50 in a state where the writing sheet 10 is attached to the base member 60 by the attachment portion 61 and the writing sheet 10 is attached to the base member 60.

In FIG. 5, the size of the gap formed between the back surface side laminate 20 and the front surface side laminate 40 is exaggerated in order to facilitate the understanding of the drawings. The size of the gap formed between the back-side laminated body 20 and the front-side laminated body 40 depends on the degree of bending of the writing sheet 10. In the present embodiment, even when the gap formed between the back-side laminated body 20 and the front-side laminated body 40 is relatively small, the adhesive layer 37 and the matte surface 52a are separated from each other to form the image 5. It is possible to erase. Therefore, according to the present embodiment, when erasing the image 5 recorded on the writing sheet 10, it is not necessary to create a large gap between the adhesive layer 37 and the matte surface 52a. Therefore, it is possible to effectively prevent foreign matter such as dust from entering the gap formed between the adhesive layer 37 and the mat surface 52a.

Further, according to the present embodiment, since it is not necessary to arrange a sliding member between the adhesive layer 37 and the mat surface 52a, the adhesive strength of the adhesive layer 37 can be reduced by repeatedly using the writing sheet 10. It can be suppressed. Therefore, it is possible to suppress a decrease in the recording stability of the image 5 when the writing sheet 10 is used repeatedly.

Further, since the user can manually grip the grip portion 62 of the writing sheet 10 to bend both the first sheet 30 and the second sheet 50, the entire space between the adhesive layer 37 and the mat surface 52a can be covered. , A gap can be formed in a short time. Therefore, it is possible to shorten the time required for the image 5 recorded on the writing sheet 10 to be erased.

[Fingertip contact part]
The fingertip contact portion 63 will be described in detail below.
The writing board 1 may include a fingertip contact portion 63 on the grip portion 62 of the writing sheet 10.
In the present embodiment, one side (lower end in FIG. 1) of the writing sheet 10 is the grip portion 62, the writing sheet 10 is arranged on the base member 60, and is viewed from the normal direction of the writing sheet 10. Occasionally, that is, in a plan view, the base member 60 is larger than the writing sheet 10, and in FIG. 1, a substantially semicircular notch is provided at the center of the lower end of the base member 60. In addition to the second surface (front surface) 10b side of the writing sheet 10, the fingertip contact portion 63 is also provided on the first surface (back surface) 10a side of the writing sheet 10.
With such a configuration, for example, the user touches the fingertip contact portion 63 on the first surface (rear surface) 10a side of the writing sheet 10 with the thumb of the hand, and the fingertip on the second surface (front surface) 10b side of the writing sheet 10 The contact portion 63 can be touched with the index finger of the hand, and the grip portion 62 of the writing sheet 10 can be easily gripped with the thumb and the index finger, and both the first sheet 30 and the second sheet 50 can be easily bent. Therefore, the image can be erased in a short time.

A plurality of fingertip contact portions 63 may be provided. The shape is not particularly limited.
When the writing sheet 10 is arranged on the base member 60, for example, a notch is provided in the base member 60, or a convex portion is formed on the surface of the base member 60 (the surface on the writing sheet 10 side). Therefore, a gap is provided between the base member 60 and the writing sheet 10, or a convex portion is formed on the first surface (back surface) 10a of the writing sheet 10 to form a gap between the base member 60 and the writing sheet 10. By providing the writing sheet 10, the fingertip contact portion 63 can be provided not only on the second surface (front surface) 10b side of the writing sheet 10 but also on the first surface (back surface) 10a side of the writing sheet 10. A plurality of notches and protrusions may be provided. Further, the shape of the cutout portion and the convex portion is not particularly limited.

[Fasting means]
The fastening means 64 will be described in detail below.
The writing board 1 may include a fastening means 64, and the writing sheet 10 may be detachably attached to the base member 60 by the fastening means.
In the present embodiment, a binding tool having an openable and closable annular portion 65 is disposed as a fastening means 64 at an end portion (upper end portion in FIG. 1) on one side of the base member 60 and is fastened. The writing sheet 10 having a through hole formed as the portion 61 is detachably bound to the base member 60 by the binding tool.

With reference to FIG. 6, attachment / detachment of the writing sheet 10 to / from the base member 60 in the writing board 1 of the present embodiment will be described.
FIG. 6 is a vertical cross-sectional view taken along the line AA for explaining a state of attachment / detachment of the writing sheet 10 on the writing board 1 of FIG.
The fastening means (binding tool) 64 of the present embodiment is composed of a lid plate, a substrate, and a flexible connecting portion for connecting the lid plate and the substrate, and is integrated with an elastic synthetic resin. A plurality of binding rods are provided on the substrate, and a binding hole into which the tip of the binding rod can be fitted is bored in the lid plate, and the lid plate, the connecting portion, the substrate, and the binding rod are formed. , An annular portion 65 that can be opened and closed is formed.
When the writing sheet 10 is attached to and detached from the writing board 1, the annular portion 65 of the fastening means (binding tool) 64 is opened by releasing the fitting between the binding hole of the lid plate and the binding rod of the substrate. The writing sheet 10 that has been hole-bound to the binding rod at the fastening portion (through hole) 61 can be removed from the base member 60, and the writing sheet 10 can be attached to the base member 60 by the reverse procedure of the above. it can.

By providing the fastening means 64, for example, when the writing sheet 10 becomes dirty, the writing sheet 10 is scratched, or the adhesive force on the surface of the adhesive layer 37 decreases due to repeated use, the writing sheet 10 becomes Even when the recording stability of the image 5 is lowered, the user himself / herself can easily replace the writing sheet 10.
Further, by preparing a plurality of writing sheets 10 having different colors, patterns, shapes, etc., the user can appropriately replace the writing sheets 10 according to his / her own preference and the intended use.

A plurality of fastening means 64 may be provided. The fastening means 64 may be provided on the base member 60, the writing sheet 10, or both the base member 60 and the writing sheet 10. Further, the fastening means 64 may be provided integrally with the base member 60 and / or the writing sheet 10, or may be provided separately.
The fastening means 64 is not particularly limited, but for example,
(1) A means for arranging a binding tool having an annular portion that can be opened and closed on the base member 60, and binding the writing sheet 10 having a hole in the fastening portion 61 to the base member 60 by the binding tool.
(2) A holding body having a holding portion is provided on the base member 60, and the elastic force of the holding body, the elastic force of the spring interposed between the base member 60 and the holding body, and the base member 60. In addition, the sandwiching portion is crimped to the surface of the base member 60 by forming at least a part of the sandwiching body with a magnetic material, and the fastening portion 61 of the writing sheet 10 is sandwiched between the base member 60 and the sandwiching body. means,
(3) A means for providing a removable adhesive layer on the base member 60 and / or the fastening portion 61 of the writing sheet 10 with an acrylic adhesive or the like, and adhering the writing sheet 10 to the base member 60.
(4) A protruding fitting male portion is provided on the base member 60, a fitting female portion that is detachably fitted to the fitting male portion is provided on the fastening portion 61 of the writing sheet 10, and the writing sheet 10 is used as a base. Means for fitting to member 60,
(5) A hook-and-loop fastener such as Magic Tape (registered trademark) or VELCRO (registered trademark) is provided on the fastening portion 61 of the base member 60 and / or the writing sheet 10, and the writing sheet 10 is attached to the base member 60. Means to do,
(6) A means for forming at least a part of the base member 60 and at least a part of the fastening portion 61 of the writing sheet 10 with a magnetic material and magnetically bonding the writing sheet 10 to the base member 60.
Etc. can be appropriately selected. Moreover, you may combine a plurality of the said means.

By the fastening means 64, in addition to the writing sheet 10, for example, a sheet material in which a pattern, a groove, a slit, or the like is provided on the sheet-shaped member may be detachably attached to the base member 60.
The sheet material is detachably attached to the back surface and / or front surface of the writing sheet 10 by the fastening means 64, and the design, grooves, and slits of the sheet material are attached, for example.
(1) Designs, grooves, slits, etc. that serve as a model for writing and memorizing letters, numbers, symbols, etc.
(2) Arithmetic problems such as addition and multiplication, and patterns, grooves, slits, and other problems related to national languages such as kanji.
(3) Original designs, grooves, slits, etc. for tracing animal designs, manga and anime character designs, etc.
By doing so, the sheet material may shift from the back and / or front of the writing sheet 10 when practicing letters and numbers, learning math and kanji, and drawing animals and characters. Since it is effectively suppressed, the writing board 1 is suitable for the above-mentioned practice, learning, drawing, and the like.
In addition, the user can appropriately replace the sheet material according to his / her own preference and the intended use.
When the sheet material is attached to and detached from the back surface of the writing sheet 10, for example, the colored layer 32 of the first sheet 30 of the writing sheet 10 is made colorless and transparent or colored transparent so as to pass through the writing sheet 10. , The patterns, grooves and slits provided on the sheet material can be visually recognized.

Further, in addition to the writing sheet 10, for example, writing paper may be detachably attached to the base member 60 by the fastening means 64.
By attaching the writing paper to the base member 60 in a detachable manner, the writing sheet 10 and the writing paper can be carried at the same time. If you want to easily erase the recorded characters and images in a short time, use the writing sheet 10. If you want to keep the recorded characters and images, you can use the writing paper. Depending on the purpose, you can use the recording on the writing sheet 10 and the recording on the writing paper properly.

[Cover member]
The cover member 70 will be described in detail below.
The writing board 1 may include a cover member 70 that protects the surface of the writing sheet 10, and the cover member 70 may be continuously provided to the base member 60.
In the present embodiment, a plate-shaped cover member 70 is continuously provided as a cover member 70 on one side of the base member 60 (the left end portion in FIG. 1). More specifically, the base member 60 and the cover member 70 are formed by providing a crease in one rectangular plate-shaped member and folding back the rectangular plate-shaped member at the crease. In FIG. 1, with the base member 60 and the cover member 70 wide open, the writing surface 3 of the writing sheet 10 is exposed so that the image 5 can be recorded with a pen 7 or the like. However, the base member 60 and the cover member It is also possible to cover the writing surface 3 of the writing sheet 10 with the 70 closed.

By providing the cover member 70, it is possible to effectively prevent the writing sheet 10 from becoming dirty and the writing sheet 10 from being scratched. Further, the writing surface 3 of the writing sheet 10 collides with something, the second sheet 50 and the adhesive layer 37 come into close contact with each other, and an unintended image is recorded on the writing sheet 10, or vice versa. It is possible to effectively prevent the writing sheet 10 in which the characters and images are recorded from hitting something and the characters and images being unintentionally erased. These are more effective when the cover member 70 is larger than the writing sheet 10. Further, these are more effective when the cover member 70 has a higher flexural rigidity than the writing sheet 10.

A plurality of cover members 70 may be provided. Further, the shape of the cover member 70 is not particularly limited as long as the surface of the writing sheet 10 can be protected. The cover member 70 may be provided integrally with the base member 60, or may be provided separately.
The method of connecting the cover member 70 to the base member 60 is not particularly limited, but for example,
(1) A method of forming a base member 60 and a cover member 70 by providing a crease in one plate-shaped member and folding it back at the crease.
(2) A method of connecting the base member 60 and the cover member 70 with a flexible member.
(3) A method in which a binding tool having an annular portion that can be opened and closed is arranged on the base member 60, a hole is formed in the cover member 70, and the cover member 70 is hole-bound to the base member 60 by the binding tool. And / or, a method of disposing a binding tool having an annular portion that can be opened and closed on the cover member 70, making a hole in the base member 60, and binding the base member 60 to the cover member 70 by the binding tool. ,
(4) A method of detachably attaching the cover member 70 to the base member 60 together with the writing sheet 10 by the fastening means 64 provided on the base member 60.
Etc. can be appropriately selected. Moreover, you may combine a plurality of the said methods.

The material of the cover member 70 is not particularly limited, and various materials such as paper, synthetic paper, cloth, wood, resin, metal, rubber, and elastomer can be selected. Specifically, paper, synthetic paper, cloth, wood, ABS resin, AS resin, polyamide resin, polycarbonate resin, polyethylene resin, polyethylene terephthalate resin, acrylic resin, polyacetal resin, polypropylene resin, polystyrene resin, silicone resin, fluororesin. Examples thereof include resins such as iron, cobalt, nickel, aluminum, and metals such as stainless steel, rubber, elastomers, glass, and ceramics. Further, a plurality of the above materials may be combined and formed.

Further, in the present embodiment, a sheet member having a substantially rectangular shape in a plan view is provided on the back surface of the cover member 70 (the surface that is on the writing sheet 10 side when the base member 60 and the cover member 70 are closed). The accommodating portion 90 is formed by being heat-welded to the cover member 70 on two sides (the left side and the lower side in FIG. 1).
By providing the accommodating portion 90 in the cover member 70, for example, by sandwiching the writing paper or the like between the accommodating portion 90, that is, the cover member 70 and the sheet member, the writing sheet 10 and the writing paper can be carried at the same time. If you want to easily erase the recorded characters and images in a short time, use the writing sheet 10, and if you want to keep the recorded characters and images, use the writing paper. The recording on the writing sheet 10 and the recording on the writing paper can be used properly according to the purpose.
The accommodating portion 90 may be provided integrally with the cover member 70, or may be provided separately. A plurality of accommodating portions may be provided. Further, the shape of the accommodating portion 90 is not particularly limited.

[Writing member mounting part]
The writing member mounting portion will be described in detail below.
The writing board 1 may include a writing member attachment portion to which the pen 7 can be attached and detached.
The writing member attachment portion may have any shape and material, may be provided integrally with the base member 60 or the cover member 70, or may be provided separately.
For example, one or more holes or slits that can hook the clip portion provided on the pen 7, a bag-shaped portion that can accommodate the pen 7, a holding piece such as a C-shaped portion that can hold the pen 7. Examples thereof include a shape that can be unevenly fitted to the outer surface of the pen 7, a magnetic material that can magnetically attach the pen 7 having at least a part formed of a magnetic material, and the shape and material of the base member 60 and the cover member 70, and the pen. It is appropriately applied according to the shape and material of 7. Moreover, you may combine a plurality of the said configurations.

It is possible to make various changes to the above-described embodiment. Hereinafter, modification examples will be described with reference to the drawings as appropriate. In the following description and the drawings used in the following description, the same codes as those used for the corresponding parts in the above-described embodiment will be used for the parts that can be configured in the same manner as in the above-described embodiment. Duplicate description is omitted.

[Modification example of writing sheet]
A modification of the writing sheet 10 will be described in detail below.
FIG. 7 is a cross-sectional view showing a modified example of the first sheet 30 and the second sheet 50 of the writing sheet 10. The first sheet 30 used for the writing sheet 10 according to this modification is provided with a base material layer 33 and a colored adhesive layer 39 on a surface facing the second sheet 50. The colored adhesive layer 39 is a combination of the colored layer 32 and the adhesive layer 37 in the present invention, and has the functions of the colored layer 32 and the adhesive layer 37 in the first embodiment. The colored adhesive layer 39 is a layer that comes into close contact with the second sheet 50 during image recording, and by making the colored adhesive layer 39 adhere to the second sheet 50, for example, the color of the colored adhesive layer 39 can be observed from the surface of the writing sheet 10. The colored adhesive layer 39 is formed on at least one surface of the base material layer 33. If colored adhesive layers 39 are provided on both side surfaces of the base material layer 33 and two second sheets 50 facing each surface are combined, a writing sheet 10 that can be recorded on both the front surface and the back surface is obtained. You can also.

The writing sheet 10 according to this modification can have the same configuration as the writing sheet 10 according to the above-described embodiment described with reference to FIG. 3, except for the first sheet 30.

As the material used for the colored adhesive layer 39, the same material as that used for the colored layer 32 or the adhesive layer 37 in the above-described embodiment can be used.

The writing board 1 of the present embodiment has a first sheet 30 having an adhesive layer 37 and a second sheet 50 having a mat surface 52a facing the adhesive layer 37, and the adhesive layer 37 and the mat surface 52a are formed. The image 5 is recorded in the contact portion between the adhesive layer 37 and the mat surface 52a by being in close contact with each other, and the adhesive layer 37 and the mat surface 52a in the close contact portion are formed by bending the first sheet 30 and the second sheet 50 together. A writing sheet 10 that is peeled off from each other and the image 5 is erased, and a base member 60 that can fasten the writing sheet 10 are provided. The writing sheet 10 has a fastening portion 61 and a gripping portion 62, and stops. It is possible to bend both the first sheet 30 and the second sheet 50 in a state where the writing sheet 10 is attached to the base member 60 by the attachment portion 61 and the writing sheet 10 is attached to the base member 60.

According to such a writing board 1, since the writing sheet 10 is attached to the base member 60 by the fastening portion 61 and the fastening portion 61 becomes a fulcrum, the grip portion 62 of the writing sheet 10 is gripped and moved upward. By lifting it up, the writing sheet 10 can be bent so that the fastening portion 61 and the gripping portion 62 come close to each other, the intrusion of foreign matter can be suppressed, and the image can be erased in a short time. , It is possible to suppress a decrease in the stability of image recording when used repeatedly.

In the writing board 1 of the present embodiment, the fingertip contact portion 63 may be provided on the grip portion 62 of the writing sheet 10.

According to such a writing board 1, by providing the fingertip contact portion 63, even when the writing sheet 10 is arranged on the base member 60 larger than the writing sheet 10, the second writing sheet 10 is provided. The grip portion 62 can be gripped by easily bringing a finger into contact with not only the surface (front surface) 10b but also the first surface (back surface) 10a of the writing sheet 10, and the first sheet 30 and the second sheet 50 can be gripped. Both can be easily bent and the image can be erased in a short time.

In the writing board 1 of the present embodiment, the writing sheet 10 may be detachably attached to the base member 60.

According to such a writing board 1, when the writing sheet 10 becomes dirty, when the writing sheet 10 is scratched, or when the writing sheet 10 is repeatedly used, the adhesive strength of the surface of the adhesive layer decreases, and the image of the writing sheet 10 Even when the recording stability is lowered, the writing sheet 10 can be easily replaced by the user himself / herself.
Further, by preparing a plurality of writing sheets 10 having different colors, patterns, shapes, etc., the user can appropriately replace the writing sheets 10 according to his / her own preference and the intended use.

The writing board 1 of the present embodiment includes a cover member 70 that protects the surface of the writing sheet 10, and the cover member 70 may be continuously provided to the base member 60.

According to such a writing board 1, it is possible to effectively prevent the writing sheet from becoming dirty and scratching the writing sheet, and the writing sheet collides with something and is not intended for the writing sheet. It is possible to effectively prevent the image from being recorded and the image recorded on the writing sheet from being unintentionally erased.

1 Writing board 3 Writing surface 5 Image 7 Pen 10 Writing sheet 10a First surface 10b Second surface 20 Back side laminate 22 Back cover film 24 Adhesive layer 30 First sheet 31 Support 32 Colored layer 33 Base layer 35 Intermediate layer 37 Adhesive layer 39 Colored adhesive layer 40 Front side laminate 42 Front cover film 44 Adhesive layer 50 Second sheet 52 Matte layer 52a Matte surface 54 Base material 56 Protective layer 60 Base member 61 Fastening part (through hole)
62 Grip part 63 Fingertip contact part 64 Fastening means (binding tool)
65 Ring part 70 Cover member 90 Storage part

Claims (4)

It has a first sheet having an adhesive layer and a second sheet having a mat surface facing the adhesive layer, and the adhesive layer and the mat surface are brought into close contact with each other to bring the adhesive layer and the mat surface into contact with each other. An image is recorded on the close contact portion, and by bending the first sheet and the second sheet together, the adhesive layer and the matte surface in the close contact portion are peeled off from each other and the image is erased. A writing board including a base member to which the writing sheet can be fastened.
The writing sheet has a fastening portion and a grip portion, and is attached to the base member at the fastening portion.
A writing board, characterized in that both the first sheet and the two sheets can be bent while the writing sheet is attached to the base member. The writing board according to claim 1, wherein a fingertip contact portion is provided on the grip portion of the writing sheet. The writing board according to claim 1 or 2, wherein the writing sheet is detachably attached to the base member. The writing board according to claim 1 or 2, further comprising a cover member for protecting the surface of the writing sheet, wherein the cover member is connected to the base member.

Images