JPH10268427A - Sheet for reflection type screen used also as white board, and reflection type screen device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet for a reflection type screen used also as a white board excellent in flexibility, and a reflection type screen device using it. SOLUTION: This sheet for the reflection type screen used also as the white board is provided with an area 1 for the white board and an area 2 for the reflection type screen, and the end parts of both areas can be connected by thermal welding or adhesion, or both areas can be integrated as front and back faces through an adhering surface. Since the area 1 for the white board is excellent in the flexibility, it can rapidly cope with the order of the small amount and the various kinds of designs by providing an image layer 14 on which an image is formed on a base material 11. As to the area 2 for the reflection type screen; a reflection layer 22 and a mat layer 25, etc., are formed on a base material 21 in order, and the glossiness of the layer 22 and that of a screen surface are set within a specified range, so that a clear video can be projected. The sheet for the reflection type screen used also as the white board excellent in the flexibility like the above is suitable for a roll type white board whose appearing surface can be moved by a rotating mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a whiteboard / reflective screen sheet and a reflective screen apparatus using the same, and more particularly to a whiteboard / reflective screen sheet made of a flexible sheet and the same. The present invention relates to a reflection type screen device using a sheet.

[0002]

2. Description of the Related Art Conventionally, transmissive and reflective screens for projecting slides and images at conferences and lectures have been known, and whiteboards have been used as recording devices for accurately transmitting the contents to an audience. It has been known.
As these screens and whiteboards, there are known a plate type in which a screen surface and a writing surface are plate-like, and a sheet type in which these surfaces are formed of a flexible film-like sheet.

[0003] Since both of these whiteboards and screens help the audience understand, it is often desirable to use both in lectures and the like, but it is sometimes difficult to use both together due to space restrictions. Considering such a case,
In addition, it is preferable that both can be used in consideration of the request for progress of lectures and the like. Under such circumstances, there has been proposed a writing board / screen which can be used as a writing board by turning the board upside down or used as a screen (Japanese Patent Application Laid-Open No. 8-142581).

[0004]

However, since the writing board / screen is of a plate type and requires a certain amount of space for reversing the front and back, a sheet whose surface is conveyed by rotation is required. Types may be more suitable.

[0005] It is also desirable that the projection screen and the whiteboard for writing have excellent performance and satisfy user requirements.

In order to meet such demands, the present invention provides a flexible sheet which can be used both as a reflective screen and as a whiteboard, and which is excellent in various performances. To provide. The present invention also provides a reflection type screen device using such a whiteboard / reflection type screen sheet.

[0007]

In order to achieve the above object, a reflective screen sheet for a whiteboard according to the present invention is provided on a flexible first base material, comprising a reflective layer and a light diffusing layer. And a whiteboard sheet having a writing layer on a flexible second base material at the ends of both sheets.

Further, another aspect of the present invention is that a reflection type screen surface having at least a reflection layer and a light diffusion layer is formed on one surface of a flexible base material, and the other surface has A whiteboard surface having at least a writing layer is formed. The base material referred to here is not only a single base material having a screen surface and a white board surface provided on both sides, but also a base material having a screen surface and a base material having a white board surface formed thereon. And two substrates in the case where they are integrated by bonding or the like.

In order to make the above-mentioned reflection type screen surface high in contrast and without luminance unevenness, preferably, the reflection layer has a glossiness (60 ° gloss) according to JIS-K-7105.
Is 70-120%, and the JIS-
The gloss (60 ° gloss) according to K-7105 is 3 to 9%.

[0010] By setting the reflective layer within the above range, SG
The peripheral or horizontal light amount ratio can be improved without lowering the value. As a result, a clear image without luminance unevenness can be displayed in a bright room. In particular, by setting the gloss of the screen surface within the above range, reflected light from the projector light source, so-called hot spot, can be made inconspicuous, and a practical high-contrast image can be obtained.

The SG value is the ratio of the luminance of the screen surface to the luminance of the perfect diffusion surface, and SG = (B / E) × π (where B is the luminance of the screen surface (cd / m2 = nit), E Is illuminance (lm / m2 = lux)).

The above-mentioned white board surface is preferably formed by a method of exposure and development, an electrostatic transfer recording method,
It has an image layer formed by any one method selected from an ink jet recording method and a thermal transfer recording method. In order to improve the flexibility, it is preferable to form the image layer by laminating a writing layer on the image layer.

Further, the present invention uses such a whiteboard / reflective screen sheet, and
This is a so-called roll-type reflection type screen device including a flexible screen sheet, a frame for supporting the screen sheet, and a rotating mechanism for transferring the exposed surface of the screen sheet by rotation. In this case, if the area for the whiteboard and the area for the reflective screen are divided into two in the direction perpendicular to the transfer direction of the screen sheet, the area for the reflective screen is expressed. It can be used as a reflection type screen, and can be used as a white board by making a screen sheet go around a half.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a reflective screen sheet for a whiteboard according to the present invention will be described in detail.

In one embodiment of the whiteboard / reflective screen sheet of the present invention, as shown in FIG. 1, a whiteboard area 1 is connected to a reflective screen area 2 via a connection portion 3. Things.

In this embodiment, the whiteboard region 1 has a writing layer 12 on a base material 11,
The base material 11 has a grid,
It has an image layer 14 on which images such as ruled lines and characters are formed.

As the plastic film 13, synthetic resins such as polyester, polyethylene, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polystyrene, polyacrylonitrile, ABS, nylon, and polypropylene can be used.

The image layer 14 may be a photosensitive layer having a layer in which the exposed portion or the other portion is dyed or colored by exposure and development, or a layer which dissolves or swells and peels off. May be a layer on which electrostatic transfer recording can be performed by an electrostatic plotter or the like, a layer on which inkjet recording can be performed by an inkjet printer, or a layer on which thermal transfer recording can be performed,
An image is formed by any of these methods.

Further, the base material 11 may have a layer such as an undercoat layer and a coloring layer between the plastic film 13 and the image layer 14, if necessary. In addition, from the viewpoint of needing flexibility, the thickness of the substrate 11 is 25 to 188 μm.
Is preferably within the range.

Since images such as grids, ruled lines, and characters are formed on the image layer 14, a plate-making process is not required. Therefore, work time can be reduced and manufacturing costs can be reduced. Therefore, it is suitable for the manufacture of small quantities of other products having different designs such as ruled lines.

The writing layer 12 is formed on the image layer 14 by coating or laminating.

When formed by coating, the resin composition of the writing layer 12 may be a thermosetting resin or a photocurable resin in terms of surface hardness. Examples of the thermosetting resin include a thermosetting acrylic resin and a melamine resin, and examples of the photocurable resin include a photosetting acrylic resin and an epoxy resin. From the viewpoint of workability, it is preferable to use a photo-curable resin, particularly an ultraviolet or ionizing radiation-curable resin as described later.

When forming by lamination,
On one surface of a transparent plastic film 15 such as a polyester film, a polycarbonate film, or a vinyl chloride film, a crosslinked cured film 16 containing a thermosetting resin or an ultraviolet or ionizing radiation curable resin is formed, and an adhesive layer 17 is formed on the other surface. Is formed and laminated via this. Thus, forming the writing layer 12 by laminating,
This is preferable because flexibility can be imparted to the entire sheet, and weather resistance can be improved by adding an ultraviolet absorber to the pressure-sensitive adhesive layer 17.

When forming by lamination, the writing layer 1
The crosslinked cured film 16 serving as the surface layer of No. 2 has a crosslinked structure introduced by irradiating ionizing radiation to a coating film of a composition mainly composed of an ionizing radiation curable resin.

The ionizing radiation-curable resin used for the writing layer 12 formed by coating or laminating has an acrylic group such as unsaturated polyester, polyether acrylate, polyester acrylate, epoxy acrylate, urethane acrylate, spiro acetal acrylate and the like. , Polybutadiene resin, polythiol polyene resin and the like can be used.

The above-mentioned ionizing radiation-curable resin can be used alone, but it is preferable to add a polyfunctional monomer in order to improve the curability and the hardness of the cured coating film. Trimethylolpropane triacrylate, pentaerythritol triacrylate Or a trifunctional monomer such as dipentaerythritol hexaacrylate, a bifunctional monomer such as neopentyl glycol diacrylate, tripropylene glycol diacrylate, diethylene glycol diacrylate, or 1,6-hexanediol diacrylate, or a tetrafunctional pentafunctional Alternatively, it can be appropriately selected from monomers having six functionalities and used.

In addition, various additives can be added to the ionizing radiation-curable resin. When ultraviolet rays are used for curing, a photoinitiator such as acetophenones, benzophenone, Michler's ketone, benzoin, benzyl methyl ketal is used. , Benzoyl benzoate, α-acyloxime ester, thioxanthone, or the like, or n-butylamine, triethylamine, tri-n-butylphosphine, or the like as an ultraviolet sensitizer.

The composition mainly composed of the ionizing radiation-curable resin may contain a matting agent in order to adjust the gloss of the cured coating film. As the matting agent, inorganic particles such as silica, calcium carbonate, and precipitated barium carbonate, or organic particles such as fluorine particles, polyethylene particles, and acrylic particles can be used. However, it is necessary that the addition amount is such that the lower image can be seen through, specifically, the total light transmittance is 80% or more.

Compositions based on ionizing radiation-curable resins can be prepared by conventional coating methods, such as, for example, Meyer bar coating, blade coating, gravure coating, rod coating, knife coating, reverse roll coating, kiss coating, spray coating, or offset. The surface of the transparent plastic film 15 constituting the writing layer 12 or the substrate 11 is directly coated by a method such as gravure coating.

After coating, the film is irradiated with ionizing radiation using an electron beam or ultraviolet rays to crosslink and cure the coating film. For electron beam, Cockloft-Walton type, Bande graph type, Resonant transformer type, Insulated core transformer type, Linear type,
Emitted from various electron beam accelerators such as a dynamitron type and a high frequency type, and 50 to 1000 keV, preferably 100 to 1000 keV.
An electron beam having an energy in the range of 300 keV can be used. Ultraviolet light, high pressure mercury lamp, low pressure mercury lamp, carbon arc, xenon arc,
Light generated from an ultraviolet light source using a light source of a metal halide lamp can be used. By introducing the crosslinked structure in this manner, the erasure and abrasion resistance of written contents can be improved while maintaining flexibility.

In the case of ultraviolet curing, irradiation is performed in an inert gas or a film is laminated to cut off oxygen and cure in order to advance the curing reaction.
In the case of electron beam curing, curing usually proceeds without taking these measures. However, when the surface properties of the coating film are required, it is more effective to block oxygen in the same manner as described above in electron beam curing.

The adhesive layer 17 is made of the transparent plastic film 1
5 is a layer for laminating 5 on the image layer 14, and is unnecessary when the writing layer 12 is formed by coating. As the adhesive layer 17, a transparent adhesive made of an acrylic resin, a urethane resin, a polyester resin, a silicon resin, or the like can be used. Further, an additive such as an ultraviolet absorber can also be used.

The method of manufacturing the whiteboard region 1 having the above-described structure is not particularly limited. For example, the image layer 14 is laminated on the plastic film 13 by coating, and the image such as the ruled line is formed on this layer by the method described above. To form Then, the adhesive layer 17 of the transparent plastic film 15 having the crosslinked cured film 16 on the front surface and the adhesive layer 17 on the back surface, and the image layer 14 surface of the substrate 11 are opposed to each other to obtain a laminate. be able to.

On the other hand, the area 2 for the reflective screen in this embodiment is laminated on the base layer 21, the reflective layer 22 laminated on the base layer 21, and the reflective layer 22 via the adhesive layer 23. It comprises a polarizing film 24 and a light diffusion layer 25 formed on the polarizing film 24.

As the substrate 21, a resin sheet such as polyethylene terephthalate or polyvinyl chloride can be used. When a reflective layer 22 described later is formed by vapor deposition, the surface on which the reflective layer 22 is provided is matted. Use what you have.

The reflection layer 22 is formed on the substrate 21 so that the gloss according to JIS-K-7105 is 70 to 120%. By setting the gloss in such a range, both the SG value and the luminance unevenness can be balanced. That is,
If the gloss is less than 70%, a sufficient SG value cannot be obtained. On the other hand, if the gloss exceeds 120%, a sufficient contrast ratio cannot be obtained, and clear images cannot be displayed.

As a preferable configuration for keeping the gloss of the reflective layer 22 in the above range, the reflective layer 22 is made of an aluminum paste and a binder resin. Such a reflective layer 2
2 can be formed by applying and drying an aluminum paste and a binder resin on a base material 21 together with a suitable solvent. As the binder resin, vinyl acetate resin, modified vinyl acetate resin, modified vinyl acetate / acrylic copolymer resin, ethylene / vinyl acetate resin, polyester resin, acrylic copolymer resin, acrylic silicone resin, cellulose resin, vinyl chloride / acetic acid Vinyl copolymer resin,
One or two or more selected from styrene-based resins, urethane-based resins, epoxy-based resins, modified polyvinyl alcohol-based resins, acrylonitrile rubber, and the like can be used. The amount of the aluminum paste contained in the resin is 10 to 40 parts, preferably 20 to 100 parts with respect to 100 parts of the resin.
About 30 parts. If the amount of the aluminum paste is too small, a predetermined gloss cannot be obtained, and if the amount is too large, the adhesiveness between the coating film and the substrate is reduced.

As another suitable structure for keeping the gloss of the reflective layer 22 in the above-mentioned range, aluminum can be deposited on the mat surface of the matted base material 21. As a method for matting the base material 21, a generally known matting method such as a sand blasting method and a chemical matting method can be adopted, but the surface roughness Ra (center line average roughness) of the base material 21 is 0.05. It is preferably in the range of 0.50 μm.

The polarizing film 24 is a polarizer or a polarizing plate having the same transmission axis as the polarization direction of the light emitted from the polarizing projector, and is not an essential component in the present invention. In addition to suppressing the reflection of external light on the screen surface, since the light is colored (generally dark gray), the density of the portion not irradiated with light from the projector, that is, the originally black portion can be increased. Thereby, a high-contrast image can be obtained in a bright room. Therefore, even when the polarizing film 24 is not used, it is preferable to provide a colored layer in order to increase the contrast. Such a colored layer is formed of the reflective layer 2
2 or the light diffusion layer 25 or the light diffusion layer 2
5 itself may contain a black pigment or dye such as carbon black.

The adhesive layer 23 is made of the polarizing film 24 described above.
Alternatively, when a colored layer is provided, this is a layer for laminating the colored layer on the reflective layer 22, and is unnecessary when the polarizing film 24 is not used or when the colored layer is formed directly on the reflective layer 22 by coating. As the adhesive layer 23, a transparent adhesive made of an acrylic resin, a urethane resin, a polyester resin, a silicon resin, or the like can be used.

The light diffusion layer 25 is the outermost layer of the reflective screen area 2 and prevents the distribution of the light reflected by the reflective layer 22 from being unevenly distributed in the center of the screen. This makes it possible to view clear images. Therefore, the gloss of the screen surface after the light diffusion layer 25 is formed is 3 to 9% according to JIS-K-7105.
And more preferably 4 to 8%. By making the gloss of the screen surface 9% or less,
The hot spot can be made inconspicuous by preventing glare. If the gloss is less than 3%, the diffusivity increases and the whole screen becomes whitish and the contrast is lowered. However, if it is 3% or more, a sufficient contrast can be obtained.

The light diffusion layer 25 is obtained by physically or chemically matting a film made of acrylic, polyvinyl chloride, polyvinylidene chloride, polystyrene, polypropylene, cellulose acetate, polyester, polycarbonate, polyethylene, polyvinyl alcohol, or the like. Is used, preferably silica, calcium carbonate, inorganic pigments such as barium sulfate, styrene resin, and a chemical mat layer obtained by mixing a resin pigment formed of an acrylic resin or the like with the resin forming the light diffusion layer 25. preferable. Since such a chemical mat layer can be formed by applying a resin coating solution on the polarizing film 24 or the reflective layer 22 and drying the same, it is necessary to laminate a physically matted light diffusion layer film. This is advantageous in manufacturing.

The light diffusion layer 25 can contain known additives such as an ultraviolet absorber and an antistatic agent as long as the light diffusion property is not impaired.

The method of manufacturing the reflective screen region 2 having the above-described configuration is not particularly limited. For example, a method of applying and drying a reflective layer 22 containing an aluminum paste on a synthetic resin film serving as the base material 21 is used. Formed by
It is manufactured by forming a chemical mat layer (light diffusion layer) 25 on one surface and laminating so that the adhesive layer 23 of the polarizing film 24 having the adhesive layer 23 formed on the other surface is adjacent to the reflective layer 22. be able to. In this case, the polarizing film 24 may be a colored film appropriately colored. Further, it may be formed by applying and drying a reflective layer 22 containing an aluminum paste on a synthetic resin film serving as the base material 21, and further applying and drying a colored light diffusion layer 25 thereon. it can.

It is also effective to apply antistatic treatment to the above-described whiteboard area 1 and reflective screen area 2 respectively. In particular, when copying as a whiteboard or when rotating and using the back surface, the sheet is transported, so that charges due to friction tend to accumulate, so it is necessary to release such charges. Therefore, the writing layer 12 on the substrate 11 in the area 1 for whiteboard
The antistatic treatment may be applied to the side or the opposite surface, or any one or more layers on the writing layer 12, or the surface of the base material 21 opposite to the screen surface in the reflective screen area 2.

Examples of the method of the antistatic treatment include a method of coating with an antistatic agent, a method of kneading into a sheet, and the like. Cationic as antistatic agent,
Various surfactants such as anionic, nonionic and amphoteric surfactants, inorganic substances such as metal powder, carbon powder and graphite, or siloxane-based coating agents can be used.

The whiteboard / reflective screen sheet of this embodiment is the same as the whiteboard area 1 described above.
And the area 2 for the reflection type screen are obtained by performing connection processing at the connection section 3. The connection process is performed by bonding or heat-sealing the cross sections of the sheet end portions of the separately prepared regions, or by bonding or heat-sealing a part of the end portions. In the case where the whiteboard sheet and the reflective screen sheet are each prepared for the sole purpose of use, the thicknesses of the whiteboard sheet and the reflective screen sheet are generally different from each other. The thickness of the whiteboard area 1 is determined so as to match the thickness of the whiteboard.

By using such a whiteboard / reflective screen sheet (hereinafter also referred to as "screen sheet"), the reflective screen device of the present invention can be manufactured. One embodiment is shown in FIG.

This reflection type screen device comprises a flexible screen sheet 100, a frame (not shown) for supporting the screen sheet, and a rotating mechanism for transferring the exposed surface of the screen sheet by rotation. Roll type.

There are the following two types of such roll types. As shown in FIG. 2 (a), a screen sheet 100 is used in which each end of a whiteboard area 1 and a reflective screen area 2 are connected to form an endless shape. It is of a circulating type in which the screen sheet 100 is circulated by a rotating mechanism 101 such that the exposed surface faces outward. The other is a screen sheet 100 as shown in FIG.
Are fixed to a pair of rotation mechanisms 102, respectively, and are wound up in an arbitrary direction by the rotation mechanism 102 so that the exposed surface is transferred.
In any case, the screen sheet 100 is the above-mentioned whiteboard / reflective screen sheet, and the whiteboard area 1 and the reflective screen area 2 are perpendicular to the transfer direction of the screen sheet 100. Direction.

As a result, in the circulation type (FIG. 2 (a)), the screen sheet 100 is moved by rotating the rotating mechanism 101, and the exposed surface can be the area 1 for the whiteboard, and the outer surface is further rotated by half. Thereby, the area 2 for the reflective screen can be exposed. In the case of the winding type (FIG. 2B), one of the rotating mechanisms 102 is used.
The area 1 for the whiteboard can be exposed by winding up to the other side, and the area 2 of the reflective screen can be exposed by winding up to the other rotating mechanism 102.

In any case, the area 1 for the whiteboard
Can be satisfactorily used as a whiteboard, and when the region 2 for a reflective screen is exposed, it can be favorably used as a reflective screen. Further, by providing a copying mechanism equipped with a scanner or the like, the items described on the whiteboard can be copied and recorded. Further, since little space is required for replacement between the reflective screen surface and the whiteboard surface, a space is not required for use.

Next, another embodiment of the whiteboard / reflective screen sheet of the present invention will be described with reference to FIG. In this embodiment, the whiteboard sheet 1
Is provided on the back surface of the reflective screen 2 via the adhesive surface 4. The respective configurations of the whiteboard sheet 1 and the reflective screen 2 are the same as those in the above-described embodiment.

In the whiteboard / reflective screen sheet of this embodiment, both the whiteboard sheet 1 and the reflective screen 2 are separately manufactured in advance by the above-described method, and then the respective substrates are bonded together. As described above, the two substrates adhered via an appropriate adhesive surface 4 constitute an integral substrate.

Alternatively, a white board surface (image layer and writing layer) or a reflective screen surface (reflective layer, adhesive layer, polarizing film, light diffusion layer) is formed on the surface of a single substrate, and the back surface (substrate) On the other side). For example, a reflective screen surface is formed on the other surface of the substrate having the image layer formed on one surface, and then a writing layer is laminated on the surface on which the image layer is formed via an adhesive layer. This makes it possible to obtain a sheet having a whiteboard surface and a reflective screen surface on each surface of a single-layer substrate.

When such a double-sided whiteboard / reflective screen sheet is used, a roll-up type reflective screen device as shown in FIG. 4 is preferred. In this reflection type screen device, the screen sheet 100 can be completely wound up around the one end by the rotation mechanism 103, and when it is expanded, one surface becomes a reflection type screen, and One side is a whiteboard. In order to be able to select a surface to be used, for example, as shown in FIG. 5, it is preferable that a frame 104 accommodating the screen sheet 100 is rotatably attached to a supporting column 105 that supports the whole by an attachment mechanism 106. That is, by rotating the mounting mechanism 106 in the vertical direction by 180 ° as indicated by the arrow in the figure, the exposed surface alternates as shown in FIGS. 6 (a) and 6 (b). In such a case, only the frame 104 for accommodating the screen sheet 100 wound up compactly is turned over, so that less rotating space is required as compared with turning over a plate type. It also saves space when not in use.

[0057]

As is clear from the above description, according to the whiteboard / reflective screen sheet of the present invention, since the entire sheet in the final form is excellent in flexibility, the whiteboard is also used. As a reflection type screen, not only a plate type but also a roll type can be suitably used. When used in a roll type, there is almost no space required for alternation between the reflective screen surface and the whiteboard surface, and it is suitable for a lecture hall or the like where the size is limited.

The area of the reflective screen has a well-balanced characteristic required for the reflective screen, and can be used as a screen for displaying clear images in a bright room. Can quickly respond to orders of many kinds in small quantities, and can exhibit sufficient performance as a whiteboard.

Further, the whiteboard-reflective screen sheet of the present invention can be easily applied to a conventional apparatus such as a whiteboard provided with a mechanism capable of copying items described on the whiteboard.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of a whiteboard / reflective screen sheet of the present invention.

FIG. 2 is a diagram showing a screen sheet of an embodiment of the reflection type screen device of the present invention from above or below,
(A) is a circulation type, (b) is a winding type.

FIG. 3 is a cross-sectional view of another embodiment of the whiteboard / reflective screen sheet of the present invention.

FIG. 4 is a diagram showing a state in which a screen sheet of another embodiment of the reflection type screen device of the present invention is rolled up from above or below.

FIG. 5 is an external view of another embodiment of the reflection type screen device of the present invention.

6 is a view showing an exposed surface of a screen sheet in the embodiment of FIG. 5 of the reflection type screen device of the present invention,
(A) shows the case where the outer surface of the roll is exposed, and (b) shows the case where the inner surface of the roll is exposed.

[Explanation of symbols]

 1 ... area for whiteboard 2 ... area for reflective screen 3 ... connecting part 4 ... adhesive surface 11 ... Base material 12 Writing layer 14 Image layer 15 Plastic film 16 Crosslinked cured film 17 Adhesive layer 21 Base material 22 Reflective layer 23 Adhesive layer 24 Polarizing film 25 Light diffusing layer 100・ Screen sheet 101, 102, 103 ・ ・ ・ ・ ・ ・ Rotating mechanism 104 ・ ・ ・ ・ ・ ・ Frame

Continuing from the front page (72) Inventor Takehisa Kimura 4-6-35 Suzuya, Yono-shi, Saitama Pref.

Claims (5)

[Claims] 1. A reflection type screen sheet comprising a reflective layer and a light diffusion layer on a flexible first substrate, and a writing layer on a flexible second substrate. A whiteboard-reflective screen sheet characterized in that the whiteboard sheet is connected to the ends of both sheets. 2. A whiteboard surface having at least a reflective screen surface provided with at least a reflective layer and a light diffusion layer on one surface of a flexible base material and at least a writing layer on the other surface. A sheet for a reflective screen which is also used as a whiteboard, wherein a sheet is formed. 3. The glossiness of the reflective layer according to JIS-K-7105 is 70 to 120%, and the JIS-K
The glossy sheet according to K-7105 is 3 to 9%, and the sheet for a reflective screen which is also used as a whiteboard according to claim 1 or 2, is provided. 4. An image layer formed under the writing layer by any one method selected from the group consisting of exposure, development, electrostatic transfer recording, ink jet recording and thermal transfer recording. The whiteboard-reflective screen sheet according to any one of claims 1 to 3, wherein: 5. A reflection type comprising a flexible whiteboard-reflection screen sheet, a frame for supporting the screen sheet, and a rotating mechanism for transferring an exposed surface of the screen sheet by rotation. In the screen device, the screen sheet is any one of claims 1 to 4.
13. A reflective screen device, which is the whiteboard / reflective screen sheet according to item 13.