JPH1172847A - Reflection type screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the mounting and dismounting of a reflection type screen to and from the surface of a ferromagnetic article and to easily assure flatness by laminating a flexible magnetic layer on the surface of a sheet for the reflection type screen on the side opposite to its reflection surface. SOLUTION: The flexible magnetic layer is laminated on the surface of the sheet for reflection type screen on the side opposite to its reflection surface. The reflection screen sheet of the reflection screen, i.e., the part functioning as the reflection screen may be the screen similar to the conventional reflection screens. The known sheet for reflection screen usable for such reflection type screen includes, for example, a sheet formed by laminating a transparent, white or other resin sheet as a light diffusion reflective layer on a base material sheet, etc. The flexible magnetic layer to be used is not particularly limited and may be known layers formed by dispersing magnetic power into flexible materials, such as plastics and rubber. The flexible magnetic layer is adhered on the surface of the sheet for reflection screen on the side opposite to its reflection surface by a tacky adhesive or adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various projectors,
Related to a reflective screen used to observe an image projected by a projector such as P from the same direction as the projector, especially to be detachable on the surface of ferromagnetic articles such as iron plates, steel furniture, white boards, and machine outer walls. The present invention relates to a reflective screen that can be attached.

[0002]

2. Description of the Related Art A reflection type screen is widely used for observing an image projected by a projector such as various projectors and OHP from the same direction as the projector, and the reflection type screen itself is generally used as a reflection type screen. A base sheet serving as a reflection layer or a base sheet provided with a reflection layer on a base material is used.

[0003] When storing a reflective screen, it is common to wind it up and store it. However, since the screen must be flat when used, the base of the screen must be kept so as not to impair the flatness of the screen. A relatively thick material is used for the material sheet itself, or a relatively thick backing sheet is provided on the surface opposite to the reflection surface. Nevertheless, it is necessary to reduce the curl and the like during storage during use, and for this purpose, an axial member for winding the screen is provided at the lower end of the screen, giving weight to it and using it as a weight during use. It is common to get the character.

[0004] For this reason, the conventional reflection type screen has a large weight as a whole and is difficult to handle.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a reflective screen which is lightweight and easy to handle, and which can easily obtain the required flatness when used as a reflective screen.

[0006]

The magnetic material is plastic,
A magnetic sheet dispersed in a flexible material such as rubber is used for various sheet materials, but a combination with a reflective screen as described above is not known.

[0007] By combining the above-mentioned reflective screen with a magnetic sheet, the reflective screen can be easily installed on the surface of steel furniture or whiteboard in an office or the like, or on the machine surface in a factory or the like. Further, since the entire reflection screen can be fixed to a flat ferromagnetic material by the magnetic sheet, the required flatness when using the screen can be easily obtained.

Accordingly, the present invention provides a reflective screen in which a flexible magnetic layer is laminated on the surface of the reflective screen sheet opposite to the reflective surface.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The reflective screen sheet of the reflective screen of the present invention, that is, the portion functioning as a reflective screen may be the same as a conventional reflective screen.

Examples of known reflective screen sheets that can be used in the reflective screen of the present invention include, for example, a substrate sheet laminated with a transparent or white resin sheet as a light diffusion / reflection layer, or a base sheet. In addition, a metal coating layer such as an aluminum evaporation layer or a metal coating layer such as an aluminum paste coating layer or a layer containing another light reflecting agent in a binder resin is provided as a reflection layer, and a reflection layer is formed thereon. Provided with a diffusion layer for diffusing the reflected light so that a reflection image can be observed at a wide viewing angle, a diffusion layer and a reflection layer comprising a light diffusion agent, a light reflection agent and a binder resin on a base sheet. Some of them include a layer that performs both functions of the layers at the same time.

In the reflective screen of the present invention, since a flexible magnetic layer is used, it is not necessary to usually use a backing sheet for preventing the flatness from being impaired, and the weight of the reflective screen can be reduced. .

The base sheet and the resin sheet of the light diffusion / reflection layer as described above include homo- or copolymers of (meth) acrylates such as methyl methacrylate and methyl acrylate, polyesters such as polyethylene terephthalate, and the like. A synthetic resin film or sheet such as polyethylene, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polystyrene, polyacrylonitrile, ABS, nylon, and polypropylene can be used.
The resin sheet used as the light diffusion / reflection layer can also be a film or sheet made of the above resin.

The above-mentioned substrate sheet or the like may be transparent, but it is preferable to use those into which a white pigment has been kneaded or foamed in order to enhance the reflection characteristics.

Although the thickness of the base sheet is not particularly limited,
Generally, from 25 to 188 μm from the viewpoint of requiring flexibility.
m, preferably in the range of about 50 to 125 μm.

The reflective layer composed of a metal deposited layer is formed by forming a thin layer of a metal such as aluminum or silver on the above-described base sheet by a vacuum deposition method, a sputtering method, an ion plating method or the like. Can be.

The metal coating layer or the reflective layer containing a light reflector other than metal in the binder resin can be formed from a composition containing the binder resin and a light reflector such as a metal.

As the light reflecting agent, flaky aluminum,
Pearl pigments and the like can be used. The flaky aluminum preferably has an average particle size of 4 to 60 μm, particularly preferably 10 to 40 μm. If the particle size of the flaky aluminum is too small, sufficient reflectivity cannot be obtained, and the luminance will be low. If the particle size is too large, glare will be noticeable.

The content of the light reflecting agent is determined by the binder resin 10
The range is preferably 10 to 80 parts by weight, more preferably 30 to 60 parts by weight, based on 0 parts by weight. By setting the amount of the light reflecting agent in such a range, it is possible to obtain sufficient luminance without causing glare.

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 / vinyl acetate 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 diffusion layer as described above can be formed from a composition containing a binder resin and a light diffusing agent.

As the light diffusing agent, transparent resin beads and the like can be used, and those having a spherical shape are particularly preferable. Mica,
An appropriate amount of inorganic particles such as pearl pigments can also be used by mixing with resin beads. By using transparent resin beads, appropriate light diffusing properties can be imparted without impairing the reflection characteristics of the light reflecting agent. As such resin beads, resin beads such as acrylic beads, styrene beads, and urethane beads can be used, and styrene beads are particularly preferable. Resin beads have a particle size of 2 to 25 μm
Are preferred. By using the transparent resin beads having a particle size in such a range, a wide viewing angle and a high SG value can be obtained.

The content of the light diffusing agent depends on the binder resin 10
50 parts by weight or more, preferably 70 parts by weight or more, based on 0 parts by weight. The upper limit of the content of the light diffusing agent is not particularly limited, but is preferably 5 from the viewpoint of adhesion to the support and physical strength of the layer.
It is preferably less than 00 parts by weight.

As the binder resin, the same resins as those described for the reflective layer can be used.

The light diffusing agent and the light reflecting agent as described above may be contained in one layer to form a light diffusing reflective layer.

Each of the above layers may contain a light-absorbing colorant such as carbon black in order to increase the contrast between the light-irradiated portion (light portion) and the dark portion. Further, a layer containing such a light-absorbing substance may be separately provided.

Each of these layers can be formed by a conventional method such as coating, lamination after forming as a film, and the like.

The flexible magnetic layer used in the reflection type screen of the present invention is not particularly limited, and may be a known one such as a magnetic substance dispersed in a flexible substance such as plastic or rubber. . For example, a sheet obtained by dispersing a ferromagnetic powder such as barium ferrite or strontium ferrite in a thermoplastic resin such as polyethylene and forming it into a sheet can be suitably used.

The flexible magnetic layer of the reflection type screen of the present invention generally has a thickness of about 50 μm to 2.0 mm, preferably about 100 to 500 μm, and has a surface magnetic flux density of about 50 Gauss or more, preferably 60 Gauss. Use more than a degree. A commercially available flexible magnetic sheet can be suitably used.

The reflection type screen of the present invention can be obtained by bonding such a flexible magnetic layer to the surface opposite to the reflection surface of the reflection screen sheet described above with an adhesive or an adhesive.

As the pressure-sensitive adhesive or adhesive, any pressure-sensitive adhesive or adhesive usually used for bonding resin materials or the like can be used. For example, known pressure-sensitive adhesives such as acrylic, polyester, rubber, and silicone can be used. Adhesive or adhesive can be used. Such a pressure-sensitive adhesive or adhesive is generally used in a thickness of about several μm to several tens μm.

[0031]

The present invention will be described in more detail by way of examples.

EXAMPLE A 100 μm thick polyester film (Lumirror E2)
0: Toray Industries, Inc.), a coating liquid for a light-diffusing reflective layer having the following formulation was applied by a bar coater and dried to form a reflective layer, thereby obtaining a reflective screen sheet.

Acrylic resin (resin solid content 50%) 30 parts by weight (Acrydic A-807: Dainippon Ink and Chemicals, Inc.) Hardener (solid content 60%) 6 parts by weight (Takenate D110N: Takeda Pharmaceutical Company Limited) Leafing type scaly aluminum paste (50% aluminum solid content) 16 parts by weight (5501EA: Showa Aluminum Powder Co.) Styrene beads (6 μm) 8 parts by weight (SBX-6: Sekisui Chemical Co., Ltd.) Carbon black 0.4 parts by weight acetic acid 40 parts by weight of ethyl 40 parts by weight of butyl acetate

An acrylic pressure-sensitive adhesive (Liquidine AR) is provided on the surface opposite to the reflective surface of the reflective screen sheet.
-2110: Liquidine Co., Ltd.) and a sheet (100 μm thick) formed by dispersing barium magnetic powder in chlorinated polyethylene to form a reflective screen of the present invention. Was.

The obtained reflection type screen could be easily and detachably attached to the surface of a ferromagnetic article such as a white board or a steel furniture, and required flatness required for the screen could be easily obtained.

[0036]

The reflection type screen of the present invention can be easily and detachably attached to the surface of the ferromagnetic article, so that the reflection type screen can be obtained and removed on the surface of the ferromagnetic article as required. The flatness required as a screen can be easily obtained.

Further, the reflection type screen of the present invention does not require a backing for making the curl less likely to be formed and a weight member for correcting the curl, so that the whole can be made lightweight. A reflective screen that is easy to handle can be provided.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takaaki Kato 4-6-35 Suzuya, Yono-shi, Saitama Pref.

Claims (1)

[Claims] 1. A reflection type screen comprising a flexible magnetic layer laminated on a surface opposite to a reflection surface of a reflection type screen sheet.