JP2007025043A - Reflection type screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reflection type screen capable of obtaining high reflectance of light at a wide angle of visibility. <P>SOLUTION: The reflection type screen which reflects projected light to display an image has an aluminum foil whose matte surface is turned to an incident side as a reflection layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reflective screen that displays an image by reflecting projection light.

  Conventionally, as the reflection type screen, a sheet in which a resin-impregnated paper is integrally laminated on the surface of a thermoplastic resin sheet (for example, refer to Patent Document 1), or a cloth having an Amundsen weave structure (for example, refer to Patent Document 2). ), And a white sheet coated with silver ink or pearl ink (for example, see Patent Document 3).

However, reflective screens made of thermoplastic resin sheets, fabrics, etc. have not been sufficient in terms of light reflectivity. In addition, a reflective screen coated with silver ink or pearl ink has a problem that a high reflectance of light can be obtained only within a narrow viewing angle range, and there is a glare.
Patent Document 4 proposes a heat-shielding screen using a matte surface of an aluminum foil, but it does not relate to a reflective screen that displays an image by reflecting projection light.

JP 2002-258409 A JP 2003-207852 A JP-A-5-216123 JP 2001-9996 A

  The present invention has been made in view of the above background, and an object of the present invention is to provide a reflective screen capable of obtaining a high reflectance of light with a wide viewing angle.

  As a result of intensive studies to achieve the above object, the present inventor has found that a high light reflectance can be obtained with a wide viewing angle by using a matte surface of an aluminum foil as a reflective surface of a reflective screen. The present invention has been conceived by conducting headings and further intensive studies.

Thus, according to the present invention, a "reflective screen that displays an image by reflecting projected light and has an aluminum foil with a matte surface facing the incident side as a reflective layer. Screen ".
At that time, the surface roughness Ra (average roughness) of the matte surface is preferably 0.30 or less. Further, it is preferable that a transparent resin coating is applied to the surface of the matte surface.

  In the reflective screen of the present invention, it is preferable that a base material layer made of a fiber material is bonded to the back side of the reflective layer. As the fiber material forming the base material layer, polyester fiber is preferable. Such a base material layer preferably has a bending resistance of 15 cm to 30 cm as measured by JIS 1096-90 method. Moreover, it is preferable that the base material layer is colored black. It is preferable that a black mask can be formed around the reflective layer by making the area of the black base material layer larger than the area of the reflective layer. Moreover, when projecting light is projected on the reflective screen, the peak gain value is preferably 2.0 or more. Furthermore, when the projection light is projected onto the reflective screen, the viewing angle width of the half gain is preferably wider than −30 degrees to +30 degrees.

  ADVANTAGE OF THE INVENTION According to this invention, the reflection type screen which can obtain the high reflectance of light with a wide viewing angle is provided.

Hereinafter, embodiments of the present invention will be described in detail.
In the manufacturing process, only one side of the aluminum foil is a mirror surface, and the other side is a matte surface having a surface roughness Ra (average roughness) of 0.20 or more. In the reflective screen of the present invention, the aluminum foil is included as a reflective layer so that the matte surface of the aluminum foil faces the incident side. In this way, by directing the matte surface of the aluminum foil to the incident side, the projection light is reflected while being appropriately diffused, so that a high reflectance of light can be obtained with a wide viewing angle. Here, if the mirror surface of the aluminum foil is directed to the incident side, a high light reflectance can be obtained only within a narrow viewing angle range, and there is a glare of glare.

  The surface roughness of the matte surface is preferably 0.30 or less (preferably 0.20 to 0.30) in terms of surface roughness Ra (average roughness). If the surface roughness Ra (average roughness) is larger than 0.30, high light reflectance may not be obtained. As an aluminum foil having a matte surface with a surface roughness Ra (average roughness) of 0.30 or less, “BESPA” (trade name) manufactured by Sumi Light Aluminum Foil Co., Ltd. is preferably exemplified.

Further, it is preferable that the matt surface of the aluminum foil is subjected to a fine embossing process because a high light reflectance can be obtained in a wider viewing angle range. In addition, as surface roughness of the fine unevenness | corrugation formed by this fine embossing process, it is preferable that it is the range of 0.15-0.25 by surface roughness Ra (average roughness).
The thickness of the aluminum foil is not particularly limited, but is preferably in the range of 20 to 40 μm in practice.

  Further, it is preferable that a transparent resin is coated on the surface of the matte surface, since the effect of preventing light deterioration, preventing rust, protecting against damage to the aluminum foil, and preventing glare can be obtained. Such transparent resins include cellulose derivatives, styrene resins, styrene joints, acrylic resins, methacrylic resins, rosin ester resins, polyvinyl acetate resins, polyvinyl chloride resins, vinyl chloride-vinyl acetate copolymers, polyester resins (polyethylene terephthalate resins). ), Polyurethane resin, butyral resin, polyamide resin and the like. Of these, acrylic resins are particularly preferable.

  In the reflection type screen of the present invention, when a base fabric made of a fiber material is bonded to the back side of the reflection layer (the side that does not receive projection light), the reflection can be stored in a roll with appropriate flexibility and elasticity. A mold screen is preferable.

  In this case, examples of the fiber material include known materials such as polyester fiber, nylon fiber, polypropylene fiber, polyethylene fiber, and vinyl chloride fiber. Of these, polyester fibers are most preferred. By employing the polyester fiber, the base fabric can be dyed with good light resistance.

  Preferred examples of such polyesters include polyethylene terephthalate-based polyesters whose main repeating unit is ethylene terephthalate, polybutylene terephthalate-based polyesters whose main repeating unit is butylene terephthalate, and polytrimethylene terephthalate-based polyesters whose main repeating unit is trimethylene terephthalate. Is done.

  In the fiber material, if necessary, a fine pore forming agent, a cationic dyeing agent, an anti-coloring agent, a heat stabilizer, a flame retardant, an optical brightener, a matting agent, a coloring agent, an antistatic agent, You may add 1 type (s) or 2 or more types of a hygroscopic agent, an antibacterial agent, an inorganic fine particle, a negative ion generator.

  The fiber form of the fiber material is preferably a multifilament (long fiber) having a total fineness of 50 to 300 dtex, a single yarn fineness, 1 to 5 dtex, and about 30 to 200 filaments. The multifilament may be subjected to normal false twist crimping or air processing.

  The structure of the base fabric is a woven or knitted fabric, a film, or a composite thereof, and a structure that can have a roll structure and does not wrinkle even when the roll is opened and closed is required. For this reason, moderate elasticity and flexibility are required, and it is preferable that the bending resistance is 15 cm to 30 cm as measured by the JIS 1096-90 method. If it is 15 cm or less, wrinkles can easily enter, and if it is 30 cm or more, flexibility is impaired and roll storage may not be possible.

  Such a base fabric may be uncolored, but is preferably colored black. By coloring the base fabric black and making the area of the base material layer larger than the area of the reflective layer as shown in FIG. 1, a black mask can be formed around the reflective layer. When used, the image display becomes clear and preferable.

  The method of attaching the base fabric to the back side of the reflective layer is not particularly limited, and is a fusion method in which a low melting point nylon nonwoven fabric is fused between the two to be attached, acrylic, urethane, polyester. And a method of bonding using an adhesive such as a system or a meltable powder. Among them, a non-yellowing moisture-curing urethane adhesive (for example, Takemelt MA3501 (trade name) manufactured by Mitsui Takeda Chemical Co., Ltd.) is preferable in terms of light fastness. In addition, there are a doctor method, a roller method, a reversal method, a spray method, and the like as a method of bonding using an adhesive, and these means can be appropriately selected.

  In addition, before bonding and / or after bonding, not only dyeing processing but also raising processing, buffing processing, embossing processing, and calendar processing may be performed on the base fabric. Furthermore, various functional agents such as a flame retardant, a hygroscopic water absorbent, and a negative ion generator may be added.

  In the reflection type screen of the present invention, since the matte surface of the aluminum foil is directed to the incident side as described above, the projection light is reflected while being appropriately diffused, so that the high reflectance of light with a wide viewing angle. Is obtained. Here, the peak gain value is preferably 2.0 or more (more preferably 2.5 or more). In addition, as the width of the viewing angle, it is preferable that the viewing angle width of the half gain is wider than −30 degrees to +30 degrees.

Next, examples of the present invention will be described in detail, but the present invention is not limited thereto. In addition, each measurement item in an Example was measured with the following method.
<Peak gain value and half gain viewing angle width>
The gain of the reflective screen was measured with a spectral radiance meter (Minolta, CS-1000). At that time, the light source keeps the same positional relationship as the object to be measured, circularly moves between -85 degrees to -2.5 degrees and +2.5 to +85 degrees by sequencer control, and the gain is measured at each position. The width of the viewing angle of the peak gain value and the half gain was measured. The gain is the maximum value of the ratio when the luminance (cd / m ² ) of the white plate when the white plate is irradiated with light is 1.
<Harikoshi>
Based on the touch determination of the three testers, the evaluation was made in three stages: “There is a harshness”, “There is a slight harshness”, and “No harshness”.
<Gleaming feeling>
According to the visual judgment of three testers, the evaluation was made in three stages: “good without glare”, “slightly glistening”, “slight and bad”.
<Flexibility>
According to the touch determination of three testers, the evaluation was made in three stages: “flexible enough to accommodate the roll”, “slightly flexible”, and “not flexible”.

[Example 1]
Sumitomo Light Metal Co., Ltd. 15μm thick aluminum foil “BESPA” (trade name) (one surface is mirror surface and the other surface is matte with surface roughness Ra (average roughness) 0.23-0.28) Surface) was coated with acrylic resin to obtain a reflective layer.

On the other hand, using a false twisted crimped yarn (manufactured by Teijin Fibers Limited) of polyethylene terephthalate with a total fineness of 155 dtex / 48 filaments, weaving poplin (plain fabric) and dyeing it black As a result, a base fabric was obtained. In the obtained base fabric, the warp density was 200 / 2.54 cm, the weft density was 120 / 2.54 cm, and the basis weight was 150 g / m ² .

Next, after cutting so that the area of the base fabric is larger than the area of the reflective layer, the reflective layer and the base fabric are bonded together under the following bonding conditions so that the mirror surface of the reflective layer is in contact with the base fabric. Thus, a reflective screen was obtained.
(Bonding conditions)
・ Adhesive: Non-yellowing moisture-curing urethane adhesive Takemelt MA3501 (trade name) manufactured by Mitsui Takeda Chemical Co., Ltd.
Bonding machine: Hirano Techseed, model R-W1
-Heating conditions: 100 ° C, resin melting temperature 100 ° C
Aging condition: 40 ° C, 24 hours

  In the obtained reflection type screen, the peak gain was 3.0, and the width of the viewing angle of the half gain was −60 degrees to +60 degrees, which had a high light reflectance at a wide viewing angle. Moreover, it was good without a feeling of glare, had elasticity, and was flexible so that roll storage was possible.

[Comparative Example 1]
When measuring the width of the viewing angle of the peak gain value and the half gain with respect to a commercially available reflective screen (made by OS Co., Ltd., screen fabric: silver) coated with silver ink on a white sheet, the peak gain was 3.6. Compared with the reflective screen obtained in Example 1, the half gain viewing angle width was -14 degrees to +14 degrees, and a high reflectance of light was obtained only within a narrow viewing angle range.

[Comparative Example 2]
The peak gain value and half gain viewing angle width of a commercially available reflective screen (made by OS Co., Ltd., screen pearl) with a pearl pigment gravure printed on the front of the black back fabric were measured. Compared with the reflective screen obtained in Example 1, the gain was 1.4, and the viewing angle width of the half gain was −52 degrees to +52 degrees.

  ADVANTAGE OF THE INVENTION According to this invention, the reflective screen which can obtain the high reflectance of light with a wide viewing angle is provided, The industrial value is very large.

An example of the reflective screen concerning this invention is shown typically, and the arrow shows the direction of projection light.

Explanation of symbols

1 Reflective layer 2 Base fabric 3 Matte surface

Claims (10)

  A reflective screen for displaying an image by reflecting projected light, wherein the reflective screen includes an aluminum foil having a matte surface directed toward an incident side.   The reflective screen according to claim 1, wherein the matte surface has a surface roughness Ra (average roughness) of 0.30 μm or less.   The reflective screen according to claim 1 or 2, wherein a transparent resin coating is applied to the surface of the matte surface.   The reflection type screen in any one of Claims 1-3 by which the base material layer which consists of fiber materials is bonded together on the back surface side of a reflection layer.   The reflective screen according to claim 4, wherein the fiber material forming the base layer is a polyester fiber.   The reflective screen according to claim 4 or 5, wherein the bending resistance of the base material layer is in the range of 15 to 30 cm as measured by the JIS 1096-90 method.   The reflective screen according to any one of claims 4 to 6, wherein the base material layer is colored black.   The reflective screen according to claim 4, wherein a black mask is formed around the reflective layer by making the area of the base material layer larger than the area of the reflective layer.   The reflection type screen according to any one of claims 1 to 8, wherein a peak gain value is 2.0 or more when projection light is projected onto the reflection type screen.   The reflective screen according to claim 1, wherein when the projection light is projected onto the reflective screen, the width of the viewing angle of the half gain is wider than −30 degrees to +30 degrees.

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