JPH0286396A - Screen speaker - Google Patents

Abstract

PURPOSE:To prevent fluctuation in a picture and to save the space also by arranging a dumping screen in which a dumping member made of at least one layer or over of high polymer foam layers or the like is laminated to a rear face of a screen substrate in front of a diaphragm of a speaker system. CONSTITUTION:A sound wave 3 generated from a speaker 1 is radiated via air, a dumping member 8, an adhesive layer 7 and a screen 6. In this case, the screen 6 is vibrated by a sound wave, but since the screen is reinforced by the 3-layer laminate structure comprising the adhesive layer 7 and the dumping member 8, the screen is resonated partially, no waving is caused and the full face is vibrated integrally. Moreover, since a large area screen is employed, a sufficient sound pressure level is obtained with less amplitude. Thus, no interference fringe of light is generated on the screen face, a sharp picture and powerful sound are obtained. Moreover, it is possible to approach the screen 6 and the rear speaker 1 to the screen.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a screen speaker for enlarging audio and 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, image projectors such as so-called video projectors, which are devices for enlarging TV and video images onto a large screen and enjoying images with great power, are becoming popular. There are two types of video projector systems for projecting images onto a screen: a transmissive screen system and a reflective screen system, and the present invention relates to the latter system. If it is possible to have a large screen as well as an acoustically realistic feeling and deep bass reproduction, it will be possible to have the atmosphere of a movie theater in the comfort of your own home.

Conventionally, images projected by a video projector are reflected and projected onto a front screen, but at this time, sound is generally reproduced by speakers placed behind the screen in a movie theater.

An example of the conventional screen speaker mentioned above will be described below with reference to the drawings.

FIG. 3 schematically shows a conventional screen speaker. In Figure 3, 1 is a speaker, 2 is a screen, 3 is a sound wave, 4 is a video projector, 16 is an image light, and speaker 1
The sound waves generated from the screen 2 are transmitted to the viewer through the air and the screen 2.

An image is projected onto a screen 2 by projecting image light 6 from a video projector 4.

As the screen 2, a sheet generally used is a sheet made of a vinyl chloride base material with a reflective layer formed by vapor deposition of aluminum on the surface and a light diffusion layer which also serves as surface protection.

Problems to be Solved by the Invention However, with the above-described configuration, when the speakers are too close to the screen or generate a large volume, the screen partially resonates due to the sound pressure from the speakers, resulting in a distorted image. There is a drawback, and to avoid this, if you move the speakers farther back, you can take up a wider space.
There was a problem that it could not be used in general households.

In view of the above-mentioned problems, the present invention provides a screen speaker equipped with a screen in which a speaker is installed at the rear of the screen to provide powerful video and sound in a small space, and which is acoustically processed without affecting the video. It is something.

Means for Solving the Problems In order to solve the above problems, the screen speaker of the present invention includes at least one layer of polymer foam or the like on the back surface of the screen base material in front of the diaphragm of the speaker system. The structure includes a braking screen made of laminated braking material.

Function The present invention has the above-described structure, and prevents the screen from partially vibrating due to the sound waves from the speaker located at the rear of the screen. This increases the rigidity of the As a result, even when powerful sound is output, partial vibrations of the screen are suppressed, and defects such as image fluctuation do not occur, and the screen and speaker diaphragm can be brought closer together, resulting in space savings.

EXAMPLE A screen speaker according to a first example of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows a screen speaker according to a first embodiment of the present invention. In FIG. 1, 6 is a screen, 7 is an adhesive layer, and 8 is a polymer foam laminated on the back side of the screen 6 via the adhesive 7. Other case numbers are the same as in the conventional example. The operation of the screen speaker configured as above will be described below. Sound waves 3 generated from the speaker 1 are radiated through the air, the damping material 8, the adhesive layer 7, and the screen 6. At this time, the screen 6 vibrates due to the sound waves, but because the screen is reinforced by the three-layer laminate structure of the adhesive layer 7 and the damping material 8, the screen resonates partially and does not cause waving, and the screen 6 vibrates throughout the entire surface. vibrate as one.

Furthermore, since the screen has a large area, the amplitude is small and the necessary sound pressure level can be obtained. Therefore, clear images and powerful sounds can be obtained without light interference fringes occurring on the screen surface.

As described above, according to this embodiment, by laminating and reinforcing the damping material 8 on the back surface of the screen 6, partial resonance due to sound waves from the rear speaker 1 can be prevented, and clear and clear sound can be obtained without fluctuation. In addition to providing an image, it is possible to bring the screen θ and the speaker 1 behind the screen closer to the screen, and space can be saved.

Although urethane resin foam (50 times foamed, thickness ts ttni) was used here as the control material 8, the same effect can be obtained by changing the material, foaming ratio, and thickness depending on the purpose. It is something. For example, any material that can provide a damping effect such as rubber, polymer elastomer, or nonwoven fabric may be used. Further, although acrylic adhesive was used as the adhesive 7, any other adhesive or adhesive may be used as long as it can fix the foam to the screen. Furthermore, although three layers of the braking material 8 are laminated here, any number of layers may be used as long as it is more than three layers, and the optimum structure can be selected depending on the strength of the screen. Further, the reinforcing effect can be obtained even if the braking material 8 is laminated not only on the entire surface of the screen 6 but also on a part thereof, so it is not necessarily necessary to laminate the entire surface of the screen 6.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic diagram of a screen speaker showing a second embodiment of the present invention. In FIG. 2, 9a is a polymer foam, 9b is a polymer foam with a smaller expansion ratio than the polymer foam 9a, and 9C is a polymer foam with a smaller expansion ratio than the polymer foam 9b. Other case numbers are the same as in the first embodiment. The operation of the screen speaker configured as above will be described below. Sound waves 3 generated from the speaker 1 are radiated through the air, the polymer foams 9c, 9b, 9C adhesive layer 7, and the screen e.

At this time, the screen 6 vibrates due to the sound waves, but the adhesive layer 7 and the polymer foams ga, 9b, 9a.

Because the screen is reinforced, local resonance does not occur and there are no drawbacks such as image fluctuation. In particular, the expansion ratio of the polymer foams 9a, 9b, and 9a is determined by the screen 6.
There is an advantage that the strength can be increased at the same thickness by increasing the thickness in the order of /j- from the one closest to , compared to when all foams with the same expansion ratio are used. As described above, by laminating the polymer foams ga, gb, and 9c with sequentially decreasing foaming ratios on the back side of the screen e through the adhesive layer, the screen 6 can be efficiently reinforced, and the rear Partial resonance of the screen 6 due to the influence of the sound waves 3 from the speaker 1 can be prevented, and it is possible to achieve both a large sound and a large screen.

Furthermore, since the speaker 1 can be brought closer to the screen 6, space can be saved. The material of the polymer foam may be urethane or the like, and if the foaming ratio is gradually decreased, the material may be changed layer by layer and the same effect can be obtained. Also, the area to be laminated may be a part of the screen 6 instead of the entire surface as in the first embodiment.

Effects of the Invention As described above, according to the present invention, a screen is disposed in front of a speaker diaphragm, and one or more layers of polymeric foam are laminated on the entire or part of the back surface of the screen facing the speaker side. Because the screen is reinforced, the sound waves from the speakers placed at the rear of the screen do not cause partial resonance in the screen, resulting in undulating effects, which results in clear images with no image fluctuation. Furthermore, since resonance does not occur even when the speaker is brought close to the screen, it is possible to provide a screen speaker that can save space.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a screen speaker according to a first embodiment of the present invention, Fig. 2 is a schematic sectional view of a screen speaker according to a second embodiment of the invention, and Fig. 3 is a schematic sectional view of a conventional screen speaker. It is a diagram. 6...Screen, 7...Adhesive layer,
8...Polymer foam, 9a...Polymer foam, 9b...Polymer foam 9&Polymer foam with a small expansion ratio, 9C... ...Polymer foam with a smaller expansion ratio than the polymer foam 9b. Medicine diagram 6-Screen f--Yu paste punishment layer 8- Gao Tezi Sanban rice tin map diagram

Claims (2)

[Claims] (1) A screen speaker that projects an image from a video projector, which is disposed in front of a speaker diaphragm and is characterized by having at least one layer of damping material laminated on the entire or part of the back surface of the screen facing the speaker side. (2) The screen speaker according to claim 1, wherein the multilayer damping material laminated on the back surface of the screen is a polymer foam, and the foaming ratio thereof decreases in the order of layers closer to the screen.