JPH1138508A - Screen for projection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a screen for projection constituted so that a clear and excellent video with depth can be obtained by projecting the video from a projector on a backing material through a base fabric, reflecting it on the baking material and projecting it on the front surface side of the base fabric. SOLUTION: The screen for projection 3 is formed of the base fabric 7 constituted by arranging many fibers 70 so as to cross them in an oblique direction and the backing material 8 integrally joined to the back surface side of the base fabric 7. The video from the projector P is projected on the material 8 through the base fabric 7, reflected on the material 8 and projected on the front surface side of the base fabric 7. That means, since the screen 3 is formed of two members being the base fabric 7 and the material 8, the structure thereof is simple and the cost thereof is reduced. Besides, it is light in weight. Thus, since the various kinds of parts with which the screen 3 is provided are made compact, the carrying work and the installing work of the screen 3 are conveniently executed. Besides, since the base fabric 7 is formed by arranging many fibers 70 so as to cross them in the oblique direction, the clear video is projected on the front surface of the base fabric 7 without causing blurring at the peripheral part of the video.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a conference room and a training room of a company, a rehabilitation room of a hospital, a lecture room of a university, a karaoke room, a small theater, a room of a general household, and the like.
The present invention relates to a projection screen used for projecting and viewing an image projected from a projector.

[0002]

2. Description of the Related Art Conventionally, this kind of projection screen is shown in FIG.
As shown in the figure, a base member 90 made of cotton or glass fiber is used.
A back coat layer 91 is joined and integrated on the back side of the base member 90, and a surface material 92 made of polyvinyl chloride resin is joined and integrated on the front side of the base member 90, and a white paint is further applied on the front side, The white paint forms a reflection surface 93 that projects an image projected from the projector.

As shown in FIG. 6, in order to enhance the reflection characteristics of the screen, a surface material 91 is used instead of the white paint.
Is provided with a glass bead layer on the front side, and the reflection surface 93 is formed by the glass bead layer.

[0004]

However, FIG. 5 and FIG.
The conventional screen shown in (1) has a multi-layer structure using a plurality of materials, so that the cost is high, and the white paint and glass beads forming the reflection surface 93 are heavy, so that the weight of the entire screen is large. For this reason, a screen device using the above-mentioned screen becomes expensive, and it is necessary to increase the size of the entire device, resulting in a heavy weight. In other words, the screen device supports a roller pipe for winding the screen in the holder, and provides a drive mechanism for lowering and winding the screen, a spring for preventing the screen from falling, and the like. However, as described above, if the overall weight of the screen is heavy, it is necessary to increase the size of each of the above-described parts to strengthen the strength, which not only increases the manufacturing cost, but also increases the size of the entire apparatus and the weight. It is too large to carry or carry. In particular, when an electric motor is used as the driving mechanism, a large motor needs to be employed because the screen is heavy, so that the weight of the entire apparatus is increased and the manufacturing cost is further increased.

An object of the present invention is to reduce the cost and weight of the screen device by simplifying its structure, thereby reducing the size of various parts of the screen device and reducing the weight of the entire device, making it easier to carry and install. It is another object of the present invention to provide a projection screen which can obtain a clear, clear and good image with a sense of depth.

[0006]

In order to achieve the above object, a screen according to claim 1 comprises a base fabric made of a large number of fibers inclined in different directions, and a backing material bonded and integrated on the back side thereof. In addition, an image from the projector is projected onto a backing material via a base cloth, reflected by the backing material, and projected on the front side of the base cloth.

According to the above screen, since it is formed of two members, the base cloth and the backing material, the structure is simple, the cost is low, and the weight is light. For this reason, when the above-mentioned screen is used for a screen device, various components provided in the screen device are reduced in size, and the entire device is reduced in cost and weight, which is convenient for carrying work and installation work.

[0008] An image from the projector is projected onto a backing material through a backing material, reflected by the backing material and projected on the front side of the backing material. Therefore, a good image with a sense of depth can be obtained. When the light is directly reflected on the surface side of the base cloth as in the related art, the image becomes flat, and a sense of depth of the image cannot be obtained. In addition, since the base fabric is composed of a large number of fibers inclined in different directions, that is, a structure in which a large number of fibers are arranged in different oblique directions with respect to the screen, a clear image can be obtained on the surface of the base fabric. At this time, if a warp and a weft are woven at predetermined intervals in the warp and weft directions, when the edge portion of the image is projected into the gap between the yarns and reflected by the backing material, this edge portion passes As a result, blurring occurs at the periphery of the image. However, when the above-described base cloth is used, the edge portion of the image is reflected by any of the fibers arranged in different inclination directions, so that a clear image is displayed without blurring of the image.

In a preferred embodiment of the present invention, one
It is formed of a polyester fiber of 00 to 200 denier. According to this base cloth, clear and good images can be obtained while reducing the weight of the screen. In addition, since the polyester fiber is hard to expand and contract, even if a base cloth in which the fiber arrangement is inclined is formed using this polyester fiber, the expansion and contraction of the base cloth hardly occurs. For this reason, when laminating the backing material on the base fabric to produce a product, the joining of the backing material to the base fabric can be accurately performed and a good screen can be obtained. If the denier number is smaller or larger than the above range, it is difficult to reduce the weight, clarify the image, and obtain good workability at the time of backing work. Therefore, the polyester fiber is preferably in the above range.

In a preferred embodiment, the backing material is
It is formed of a urethane film of ２０20 μm. According to this backing material, the weight of the screen can be reduced. In addition, since the urethane film has excellent light-shielding properties, a good image can be obtained, and since it has excellent sound insulation properties and weather resistance, it can be optimally used as a projection screen.
Furthermore, since the urethane film and the base fabric can be easily joined and integrated by laminating, the screen can be easily manufactured at low cost. In addition, the screen gain (brightness) can be changed by selecting urethane films of different thicknesses. For example, if a thick backing material is used, the gain becomes large, while if a small thickness backing material is used, the gain becomes small. Therefore, a screen optimal for various projectors can be obtained. If the thickness of the backing material is smaller or larger than the above range, the same adverse effects as in the above case occur. Therefore, the backing material is preferably in the above range.

Further, in a preferred embodiment, the backing material is colored white to black. In this way, the screen gain can be changed as in the above case. For example, when the backing material is white, the gain is large, and when the backing material is black, the gain is small. Therefore, a screen optimal for various projectors can be obtained.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall structure of a screen device 1 that projects an image projected from a projector P. The screen device 1 supports a roller pipe 4 for winding a projection screen 3 on a holder 2, and a driving mechanism 5 for winding down and winding up the screen 3 on the roller pipe 4, and a screen 3.
An unillustrated spring or the like is provided to prevent the fall.
The holder 2 is provided with a pair of left and right brackets 6, and the screen device 1 is attached to the ceiling or the wall of the room via the brackets 6. For example, when mounting on a ceiling, a fixing screw is screwed from each bracket 6 to the ceiling in a state where the holder 2 is in contact with the ceiling. A fixing screw is screwed from the bracket 6 to the wall. In the figure, reference numeral 30 denotes a weight bar attached to the lower side of the screen 3, and reference numeral 50 denotes a chain for manually operating the drive mechanism 5 to lower and lower the screen 3.

As shown in FIGS. 1 and 2, the projection screen 3 includes a base cloth 7 in which a large number of fibers 70 are arranged obliquely in an intersecting manner, and a backing bonded and integrated to the back side thereof. Material 8 is formed.

The base cloth 7 is formed of 100-200 denier polyester fiber. At this time, as the base cloth 7, TSD2811-272 (double needle Russell) manufactured by Shikishima Spinning Co., Ltd. is suitably used. This base cloth has a thickness of 0.6 mm, and 28 polyester fibers (150 deniers) are arranged in an oblique direction per inch. Further, as the base fabric 7, a fabric having a single denby or brane cord structure in which many fibers are arranged in a zigzag shape can be used.

The backing material 8 is formed of a urethane film having a thickness of 1 to 20 μm.
Color black.

The base cloth 7 and the backing material 8 are laminated and joined together to form a screen 3.
To form In this way, the structure of the screen 3 is simplified, the cost is reduced, and the screen 3 is reduced in weight. Therefore, when the screen 3 is employed in the screen device 1, various components such as the holder 2, the roller pipe 4, and the drive mechanism 5 included in the screen 3 are reduced in size, and the entire device is reduced in cost and weight so that the transportation operation can be performed. It is convenient for installation work. It is preferable that the laminating process is performed with an adhesive or the like interposed between the base cloth 7 and the backing material 8.

Also, by using the base cloth 7, clear and good images can be obtained while the weight of the screen 3 can be reduced. Moreover, since the polyester fibers forming the base fabric 7 are hard to expand and contract, the base fabric 7 hardly expands and contracts even if the polyester fabric is used to form the base fabric 7 in which the fiber arrangement is oblique. For this reason, when laminating the backing material 8 on the base fabric 7 to produce a product, the joining of the backing material 8 to the base fabric 7 can be accurately performed, and a good screen 3 can be obtained.

Further, by using the urethane film as the backing material 8, the weight of the screen 3 can be reduced. Moreover, since the urethane film is excellent in light-shielding properties, a good image can be obtained, and since it is also excellent in sound insulation properties and weather resistance, it can be optimally used as the projection screen 3. Furthermore, urethane film and base cloth 7
Can be easily joined and integrated by laminating, so that the screen 3 can be easily manufactured at low cost.

On the screen 3 described above, the projection light P1 from the projector P is applied to the base cloth 7 as shown in FIG.
Is projected onto the backing material 8 and reflected by the backing material 8 to form an image on the front side of the base cloth 7. By doing so, a good image with a sense of depth can be obtained on the surface side of the base cloth 7. Moreover, since the base cloth 7 is formed by arranging a large number of fibers 71 in an oblique crossing manner, a clear image can be formed on the surface of the base cloth 7 without blurring around the image. Is projected.

At this time, since the thickness of the urethane film forming the backing material 8 is in the range of 1 to 20 μm, an optimum gain (brightness) corresponding to various projectors can be obtained by selecting a film having an arbitrary thickness. Screen 3 is obtained.

FIG. 3 shows the change in gain with respect to the thickness of the urethane film with the vertical axis representing the gain and the horizontal axis representing the angle. Curve A in FIG. 3 shows a film thickness of 10 μm and curve B shows a film thickness of 2.5 μm. Is shown. As is apparent from the figure, when viewing the image projected on the screen, it is normal to view the image at an angle of about -30 to 30 degrees. In this angle range, the curve A has a large gain, while the curve A has a large gain. B has a small gain. As described above, since the gain can be changed according to the film thickness, it is possible to form a screen optimal for various projectors.

Further, since the urethane film forming the backing material 8 is colored white to black, by selecting this color, the screen 3 having an optimum gain according to various projectors can be obtained.

FIG. 4 shows a change in gain with respect to the color of the urethane film in which the ordinate represents the gain and the abscissa represents the angle. Curve C in FIG. As can be seen from the figure, in the case of D, the gain is almost linear, and the gain hardly changes with respect to the angle. On the other hand, the gain of the curve C is large. The gain at 30 to 30 degrees increases. As described above, since the gain can be changed according to the color of the film, it is possible to form a screen optimal for various projectors. FIG. 3 shows data obtained when a urethane film having a thickness of 5 μm is used.

In the above embodiment, the manual type screen device 1 is shown as an application example of the present invention, but the screen 3 of the present invention can be used for an electric type having an electric motor. Further, since the screen 3 of the present invention is thin and lightweight, it can be used by directly attaching it to, for example, a wall of a room.

[0025]

As described above, according to the projection screen of the present invention, the structure can be simplified, the cost can be reduced, and the weight can be reduced. Accordingly, various parts of the screen device can be reduced in size, and the entire device can be reduced in weight. This makes it convenient for transportation and installation work, and also provides a clear and well-detailed good image.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire screen device using a screen of the present invention.

FIG. 2 is an enlarged side view of the screen.

FIG. 3 is a graph showing a change in gain with respect to a thickness of a backing material.

FIG. 4 is a graph showing a change in gain with respect to the color of a backing material.

FIG. 5 is a side view showing a conventional screen.

FIG. 6 is a side view showing another conventional screen.

[Explanation of symbols]

 7 Base cloth 70 Fiber 8 Backing material P Projector

Claims (4)

[Claims] 1. A screen for displaying an image projected from a projector, comprising: a base fabric made of a large number of fibers inclined in different directions; and a backing material joined to and integrated on the back side of the screen. Is projected onto a backing material through a base cloth, reflected by the backing material, and projected on the front side of the base cloth. 2. The projection screen according to claim 1, wherein the base fabric is formed of 100 to 200 denier polyester fibers. 3. The projection screen according to claim 1, wherein the backing material is formed of a 1 to 20 μm urethane film. 4. The projection screen according to claim 1, wherein the backing material is colored white to black.