JPH041739A - Screen - Google Patents

Abstract

PURPOSE:To allow the control of a visual field angle characteristic by providing a light reflecting layer on one surface of a woven fabric formed by using fine wires having an oval or elliptic sectional shape as warp and weft. CONSTITUTION:The light reflecting layer 7 is provided on one surface of the woven fabric formed by using the fine wires having the oval or elliptic sectional shape as the warp 5 and the weft 6. The light reflecting layer 7 is formed by vapor deposition of aluminum on one surface of the base material sheet of the screen. Since the light 8 projected from a video projector is reflected while having the reflection distribution by the sectional shape of the warp and weft and, therefore, the reflected light 9 can be condensed to a specific direction unlike the conventional screen by which the light is reflected with the uniform distribution. The visual field angle characteristic of the screen meeting purposes is thus attained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a screen for displaying an enlarged image using a video projector or the like.

2. Description of the Related Art In recent years, with the arrival of the AV era, video projectors such as so-called video projectors, which are devices that enlarge TV and video images onto a large screen and enjoy the images with great power, are becoming popular. There are two types of video projectors for displaying images on a screen: a transmissive screen method and a reflective screen method, and the present invention relates to the latter method.

The image projected by a conventional video projector is reflected and projected onto the front screen. The screen used in this case is generally made of a polymer sheet as a base material and has a light reflecting layer formed on one side thereof.

In addition, the system outputs audio from speakers placed behind, to the side, or below the screen.

Hereinafter, an example of the conventional screen mentioned above will be explained with reference to the drawings. FIG. 3 shows a schematic cross-sectional view of a conventional screen. In FIG. 3, 1 is a screen base material made of a polymer sheet, 2 is a light reflection layer that reflects incident light, and projection light 3 from a video projector is shown. is the light reflective layer 2
and is reflected as reflected light 4.

Problems to be Solved by the Invention However, in the above-described configuration, the light reflecting layer is planar and reflects in a negative manner from any direction, so there is no anisotropy in the vertical and horizontal directions, and the screen It has been difficult to increase the brightness of the screen because it is not possible to control the viewing angle characteristics of the screen or to concentrate reflected light in a specific direction. Furthermore, when used in combination with a speaker as an AV system, if the speaker is placed behind a screen to save space, the sound waves from the speaker will be blocked by the screen base material, resulting in deterioration of the acoustic characteristics.

Means for Solving the Problems In order to solve the above problems, the screen of the present invention has a structure in which a light reflecting layer is provided on one side of a fabric using thin wires having an oval or elliptical cross-sectional shape as warp and weft threads. ing.

Function: Due to the above-described configuration, the present invention allows viewing angle characteristics to be freely controlled by changing the cross-sectional shapes of the warp and weft, unlike conventional screens. 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 through it, it is possible to place the speaker behind the screen, making it a more economical AV system. This is something that can be realized as a space.

EXAMPLE A screen according to a first example of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view of a screen in a first embodiment of the invention. Further, FIG. 2 is a schematic horizontal cross-sectional view of the screen. In Figures 1 and 2, 5 is a warp consisting of thin wires with an elliptical cross section;
is a weft made of thin wires with an elliptical cross section; 7 is a light reflecting layer; 8 is projected light from a video projector; and 9 is its reflected light.

The warp threads 5 and the weft threads 6 are made of plastic molded into fibers with an elliptical cross section, and are plain woven to form a screen base sheet. The light reflecting layer 7 is formed by aluminum vapor deposition (thickness: 600 mm) on one side of the screen base sheet.

With the above configuration, the projected light 8 from the video projector is reflected with a reflection distribution depending on the cross-sectional shapes of the warp and weft. The reflected light can be concentrated in the direction of the screen, and viewing angle characteristics of the screen can be realized according to the purpose.

Further, by changing the cross-sectional shape of the warp and the cross-section 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 open area ratio of the fabric is 25%, the effect of the present invention will be even better. In other words, if the aperture ratio of the fabric is 25%, even if the speaker is installed behind the screen, it will be possible for sound waves to pass through the gaps in the screen, creating a space-saving AV that can reproduce sound as well as images. The system can be realized. Although the aperture ratio was set to 25% in this embodiment, the aperture ratio may be changed depending on the purpose. Increasing the aperture ratio (if you do so, the light reflectance will be low and the image will be dark); conversely, if you make the aperture ratio small (if you do so, the reflectance will be high and the video will be brighter, but it will be difficult for sound waves to pass through, which will affect the acoustic characteristics) Deterioration occurs.Experiments have shown that if the aperture ratio is smaller than 15% (then the effect on the acoustic characteristics will be significant and a practical problem will occur. Therefore, if the aperture ratio is 15 to 25%, good acoustic characteristics and image quality will be achieved. is obtained.

In this embodiment, the cross sections of the warp and weft threads are elliptical, but it goes without saying that similar effects can be obtained by using oval or other curved cross sections depending on the desired distribution of reflected light. Further, the light reflecting layer is not limited to aluminum, and any material that emits light, such as silver, may be used. Furthermore, the method of weaving the warp and weft to form the screen base material may be a method used for conventional woven fabrics, such as plain weave, twill weave, or satin weave.

Effects of the Invention As described above, according to the present invention, a fabric made of warp and weft yarns having an oval or elliptical cross section is used as a base material,
Since the screen is constructed by providing a light reflection layer on the surface, it is possible to provide anisotropy in the light reflection distribution, and it is possible to provide a screen having light reflection characteristics depending on the purpose. In addition, since it is a screen made of textile,
By controlling the thread spacing of the fabric, the open area ratio can be set freely. Therefore, even if the speaker is installed behind the screen, good acoustic characteristics can be obtained because the sound waves pass through the screen, and space is saved because there is no need to place the speaker next to or below the screen as in the past. This is something that can be realized.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a screen according to an 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 reflective layer.

Claims (2)

[Claims] (1) A screen characterized in that a light-reflecting layer is provided on one side of a fabric using thin wires having an oval or elliptical cross-sectional shape as warp and weft yarns. (2) The screen according to claim (1), having an aperture ratio of 15 to 25%.