JPH0724438B2 - Screen speaker system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen speaker system for enlarging audio and enlarging and displaying an image.

2. Description of the Related Art In recent years, image projectors such as so-called video projectors, which enlarge televisions and video images on a large screen and enjoy images with great force, are becoming popular.

This video projector has two types as a system for projecting an image on a screen, a transmissive screen system and a reflective screen system, but the present invention relates to the latter system. If you give it a powerful and realistic feel by using it, it will be possible to bring the atmosphere of a movie theater into your home.

Conventionally, the image projected by the video projector is reflected and projected on the front screen, but in the case of a movie theater, the sound is reproduced by the speaker placed at the rear of the screen. In the case of etc., there is a screen speaker system in which reproduction is performed by a speaker placed beside or below the screen.
An example of the conventional screen speaker system described above will be described below with reference to the drawings. FIG. 5 is a plan view of a conventional screen speaker system. In FIG. 5, 1 is a speaker, 3 is a screen, 3a is a small-diameter opening formed in the screen, 6 is a video projector,
Reference numeral 7 is image light, and 12 is sound wave. The screen 3 arranged in front of the speaker 1 is partially opened with an opening 3a, and the sound wave emitted from the speaker 1 goes out of the screen 3 through the opening 3a. The image light 7 is projected from the video projector 6 and projected on the screen 3. The screen 3 is generally a sheet of polyvinyl chloride having a reflective layer formed on the surface thereof.

However, in the above-described configuration, the screen has an opening for passing sound from the back (aperture ratio of 10 to 20%), so the reflectance of the screen itself is low. There was a problem that the image of the video projector became dark. In addition, since the sound is emitted from the back of the screen, the screen itself vibrates and resonates, causing the screen to fluctuate. In addition, the method of placing the speaker around the screen has a problem in that the area of the screen has to be reduced in a space-limited place.

In view of the above problems, the present invention provides a screen speaker system capable of transmitting sound from a speaker without lowering the screen brightness and without causing image fluctuation.

Means for Solving the Problems In order to solve the above-mentioned problems, a screen speaker system of the present invention is provided with a screen for displaying an image on the front surface of a speaker cabinet with a diaphragm and a constant distance. The braking member comes into contact with a part or the entire back surface of the.

Effect The present invention is capable of preventing the vibration of the screen without providing an opening in the screen because the screen surface is braked by the above-mentioned configuration, and it is possible to realize a bright and blur-free image.

Example Hereinafter, a screen speaker system of an example of the present invention will be described with reference to the front side.

FIG. 1 is a sectional view of a screen speaker system according to a first embodiment of the present invention, and FIG. 2 is a perspective sectional view of its main part. In FIG. 1 and FIG. 2, 1 is a speaker for producing sound, 2 is a cabinet for housing the speaker 1, 3 is a screen, 4 is a screen and a screen braking member 5.
5a is a frame for supporting the above, 5a is a tip of a braking material composed of a large number of conical projections, 6 is a video projector, and 7 is image light projected from the video projector. The material used as the braking material here is a long sheet (thickness: 30 mm, width: 60 mm, height of protrusions) made by foaming urethane resin 30 times and cutting it into corrugations on one side so that innumerable conical protrusions gather together. 10mm, pitch 20mm)
Is.

The operation of the screen speaker system configured as above will be described. First, when the speaker 1 is driven, a sound wave is generated and diffused forward. This vibration also vibrates the screen 3, but on the back surface of the screen 3, the braking material 5 holds a certain distance from the cabinet 2 and the top surface of the frame 4. Since the conical projections 5a formed on the upper end of the braking member contact the screen 3 and vibrate with a large amplitude, the image does not fluctuate. . Further, since the screen 3 is not provided with an opening, there is an advantage that the brightness is increased and the image is brightened. The screen used here is a commonly used polyvinyl chloride sheet whose surface is treated with Al to form a reflective surface. However, any structure or material that provides a bright image and a wide viewing angle can be used. Not a thing. Also, regarding the size, any size may be selected and a size according to need may be selected. Further, the braking material is not limited to urethane foam, and any soft and elastic material such as felt, rubber, woven cloth, or the like can obtain the same effect, and the shape is not limited to a long sheet shape, and may be a full sheet.
Also, the shape of the protrusion at the tip is not limited to a conical shape, but a square shape, an uneven shape,
It may be a hemispherical type. In the present embodiment, the shape of the arrangement of the braking member is also a cross shape, but other shapes such as a rhombus and a triangle can similarly obtain the braking effect and are not limited to the cross shape.

FIG. 3 is a sectional view of a screen speaker system according to the second embodiment of the present invention. In Figure 3, 1,2,3,4,
5 is a speaker, cabinet, screen,
A frame and a braking member, and 8 is a spacer that holds a space between the braking member 5 and the diaphragm 9. In the screen speaker system configured as described above, the influence of the sound waves emitted from the diaphragm 9 of the speaker 1 on the vibration of the screen 3 surface can be controlled by the spacer 8. Therefore, the physical properties of the screen material and the speaker can be improved. With the characteristics of, it is possible to design the optimum acoustic characteristics.

FIG. 4 is a perspective view of a main part of the screen speaker system according to the third embodiment of the present invention. In FIG. 4, 3 is a screen, 4 is a frame, 5 is a braking material, 10 is a spring for applying tension to the screen, 11 is a tension adjustment in which the spring 10 is fixed to the tip of the screw so that the screw can rotate. It is a screw for. In the screen speaker system configured as described above, the tension of the screen 3 can be freely increased or decreased by rotating the plurality of tension adjusting screws 11, whereby the screen 3 Control the resonance frequency, screen 3
The vibration of can be controlled. Furthermore, since the tension can be adjusted, the slack due to the secular change of the screen can be absorbed and the optimum screen surface can be always maintained. In addition to the mechanism shown in this embodiment, the tension adjusting mechanism is
Similar effects can be obtained by using other commonly used mechanisms.

EFFECTS OF THE INVENTION As is apparent from the above, by arranging the screen on the front surface of the speaker cabinet and making the braking material contact the part or the whole of the back surface of the screen, sound waves are radiated from the speaker on the back surface of the screen. Also, the screen will not vibrate significantly, and it will be possible to enjoy powerful audio without blurring the image.

[Brief description of drawings]

FIG. 1 is a sectional view of a screen speaker system according to a first embodiment of the present invention, FIG. 2 is a perspective sectional view of a main part of FIG. 1, and FIG. 3 is a sectional view of a second screen speaker system of the present invention. FIGS. 4 and 5 are perspective views of a main part of a screen speaker system according to a third embodiment of the present invention, and FIG.
The figure is a plan view of a conventional screen speaker system. 1 ... speaker, 2 ... cabinet, 3 ... screen, 4 ... frame, 5 ... braking material, 5a ... conical projection, 6 ... video projector, 9 ... diaphragm, 10 ...
Spring, 11 …… Screw for tension adjustment.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichi Obata 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-57-69995 (JP, A) (JP, U) Actually opened 57-4886 (JP, U)

Claims (1)

[Claims] 1. A screen for displaying an image from an image projector is disposed on the front surface of a speaker cabinet with a constant distance from a diaphragm of the speaker, and a large number of pointed tips are provided on a part or all of the back surface of the screen. The screen speaker system is characterized in that it is arranged so that the braking material formed by the protrusions of the above is in contact.