JP2762675B2 - screen - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen for enlarging and displaying an image using an image projector or the like.

2. Description of the Related Art In recent years, with the advent of the AV era, an image projector such as a so-called video projector, which enlarges a TV or video image to a large screen and enjoys the image with great power, is becoming popular. In this video projector, there are two types of a screen projection system, a transmission screen system and a reflection screen system, and the present invention relates to the latter system.

The image projected by the conventional video projector is reflected and projected on a front screen. The screen used at this time generally has a polymer sheet as a base material and a light reflection layer formed on one surface thereof.

The sound is output from a screen placed behind, beside, below, etc. the screen.

Hereinafter, an example of the above-described conventional screen will be described with reference to the drawings. FIG. 3 shows a schematic sectional view of a conventional screen. In FIG. 3, reference numeral 1 denotes a screen base made of a polymer sheet, and 2 denotes a light reflection layer that reflects incident light. Projection light 3 from an image projector is reflected by the light reflection layer 2 to become reflected light 4. Reflected.

However, in the configuration as described above, since the light reflecting layer has a planar shape and uniformly reflects from any direction,
There is no anisotropy in the vertical and horizontal directions, and the viewing angle characteristics of the screen cannot be controlled. In addition, since the reflected light cannot be concentrated in a specific direction, it has been difficult to increase the brightness of the screen. Furthermore, when the speaker is used behind the screen for the purpose of saving space when used in combination with the speaker as an AV system, there is a disadvantage that sound waves from the speaker are blocked by the screen base material, and the acoustic characteristics deteriorate.

Means for Solving the Problems In order to solve the above problems, the screen of the present invention has a configuration in which a light reflecting layer is provided on one surface of a woven fabric using a thin line having a cross section of an ellipse or an ellipse as a warp and a weft. ing.

Action The present invention differs from the conventional screen by the above-described configuration, by changing the cross-sectional shapes of the warp and the weft,
The viewing angle characteristics can be freely controlled. In addition, since it is made of woven fabric, the porosity can be controlled by changing the weave pitch, and by allowing sound waves to pass therethrough, it is possible to arrange the speaker behind the screen, which saves the AV system. Space can be realized.

Embodiment Hereinafter, a screen according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a screen according to a first embodiment of the present invention. Also,
FIG. 2 is a schematic horizontal sectional view of the screen. FIG. 1,
In FIG. 2, 5 is a warp thread whose cross section is an elliptical thin line
Reference numeral 6 denotes a weft thread having an elliptical cross section, 7 denotes a light reflecting layer, 8
Is projection light from the video projector, and 9 is its reflected light. As the warp yarns 5 and the weft yarns 6, plastics having an elliptical cross-sectional shape are formed into fibrous shapes and used, and the screen base sheet is formed by plain weaving. The light reflection layer 7 is formed by vapor-depositing aluminum (thickness: 600 mm) on one side of the screen base sheet.

With the configuration described above, the projection light 8 from the video projector is reflected with a reflection distribution according to the cross-sectional shape of the warp and weft, so that unlike a conventional screen, the light 8 is reflected with a uniform distribution. The reflected light can be concentrated in the direction of, and the viewing angle characteristics of the screen according to the purpose can be realized. Also, by changing the cross-sectional shape of the warp and the cross-sectional shape of the weft, the viewing angle characteristics in the horizontal direction and the vertical direction can be changed.

Further, if the warp yarns 5 and the weft yarns 6 are woven so that the opening ratio of the woven fabric is 25%, the effect is further improved by the present invention. That is, if the aperture ratio of the fabric is 25%, even when the speaker is installed behind the screen, the sound waves 10 can pass through the gap of the screen, and a space-saving AV that can provide good sound reproduction together with the image. The system can be realized. In this embodiment, the aperture ratio is set to 25%.
The aperture ratio may be changed according to the purpose. Increasing the aperture ratio reduces the light reflectance and darkens the image. Conversely, as the aperture ratio decreases, the reflectance increases and the image becomes brighter, but the sound waves cannot pass easily, and the acoustic characteristics deteriorate. According to the experiment, if the aperture ratio is smaller than 15%, the effect on the acoustic characteristics becomes remarkable, causing a problem in practical use. Therefore, if the aperture ratio is 15 to 25%, good acoustic characteristics and images can be obtained.

In the present embodiment, the cross sections of the warp and the weft are elliptical, but it goes without saying that the same effect can be obtained by using a cross section composed of an ellipse or another curve in accordance with the target reflected light distribution. Also, the light reflecting layer is not limited to aluminum, and any material that emits light, such as silver, may be used. Further, the weft of the warp and the weft for forming the screen substrate may be a method used in conventional woven fabrics, for example, plain weave, oblique weave, satin weave.

Effect of the Invention As described above, according to the present invention, a cross-sectional shape is a woven fabric composed of warp and weft yarns having an elliptical or elliptical shape, and a screen is formed by providing a light reflection layer on the surface thereof. It is possible to provide a screen having anisotropy in the light reflection distribution and having a light reflection characteristic according to the purpose, that is, a screen in which the viewing angle characteristic can be freely controlled. Further, since the screen is made of a woven fabric, the aperture ratio can be freely set by controlling the yarn interval of the woven fabric. Therefore, even if a speaker is installed behind the screen, good acoustic characteristics can be obtained because sound waves pass through the screen, and there is no need to place the speaker beside or below the screen as in the past, thus saving space. Can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a screen in one embodiment of the present invention, FIG. 2 is a schematic horizontal sectional view of the same, and FIG. 3 is a schematic sectional view of a conventional screen. 5 ... warp, 6 ... weft, 7 ... light reflection layer.

Continuation of the front page (56) References JP-A-50-144440 (JP, A) JP-A-51-68229 (JP, A) JP-A-2-77735 (JP, A) JP-A-2-104723 (JP, A) , A) Real opening 59-71334 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03B 21/60

Claims (2)

(57) [Claims] 1. A screen characterized in that a light reflecting layer is provided on one side of a woven fabric using a thin line having an oval or elliptical cross section as a warp and a weft. 2. The screen according to claim 1, wherein said screen has an aperture ratio of 15 to 25%.