JP2568582B2 - Speaker screen system - Google Patents

Description

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

2. Description of the Related Art In recent years, with the advent of the AV era, video projectors, such as so-called video projectors, which enlarge TV and video images to a large screen and enjoy images with great power, have become widespread. There are two types of video projectors, a transmissive screen type and a reflective screen type, which are used to project images on a screen. The present invention relates to the latter type. This reflective screen system can provide a sense of realism as well as a large-screen display, so that even at home, it is possible to have an atmosphere like a movie theater.

Conventionally, an image projected by a video projector is reflected and projected on a front screen. At this time, in a case such as a movie theater, sound is generally transmitted from a speaker placed at the rear of the screen, or ,
At home and the like, there is a speaker screen system in which a speaker placed beside or below the screen is output.

Hereinafter, an example of the above-described conventional speaker screen system will be described with reference to the drawings.

FIG. 4 shows a conceptual diagram of a conventional speaker screen system. In FIG. 4, 1 is a speaker, 2 is a screen, 3 is an opening having a small diameter opened in the screen 2, 4 is a sound wave, 5 is a projector, and 6 is image light, which is provided on the screen 2 disposed in front of the speaker 1. Has an opening 3 with a diameter of about 1 mm, and the sound emitted from the speaker 1 is
The sound wave 4 passes through the opening 3 and emerges from the screen 2. The image is projected on the screen 2 by projecting image light 6 from the projector 5. The screen 2 is generally a white screen such as vinyl chloride.

Problems to be Solved by the Invention However, in the above configuration, the sound passing through the screen with the opening is different from the sound output from a speaker that does not originally arrange anything at the front by this screen,
There has been a problem that the output sound pressure frequency characteristics change and deteriorate, and the original performance of the speaker cannot be fully utilized.

In this case, the screen is white and the opening is 10
Since the screen is opened with an aperture ratio of about 20%, the reflectance of the screen itself is low, and the image of the projector is dark, and there is a problem that it can be used only in a room where the room is completely dark.

Further, in particular, a speaker for a bass (woofer) is generally of a shape having a large depth, and a cone-shaped speaker is used. The method of placing the speaker after or around a screen is limited by spatial restrictions such as at home. There is a drawback that it cannot be used in a place where there is.

In addition, regarding a large cone type bass speaker,
No. 61-223149, "Speaker System", proposes a thin direct-radiation speaker system. In this, a low-profile thin speaker system is configured by driving the same diaphragm with different acoustic loads. Although the contents of the present invention include those related to this "speaker system",
This "speaker system" is characterized in that it can be configured as a large and thin low-pitched speaker, and the diaphragm of the speaker has a large area, so that even when the sound pressure output is large, the vibration displacement is a general cone-shaped speaker. It is much smaller than.

The present invention has been made in view of the above problems, and has the effect of a large-screen screen for capturing an image without impairing the characteristics of a speaker.
An object of the present invention is to provide a low-profile low-profile speaker screen system that does not take up space.

Means for Solving the Problems In order to solve the above problems, the speaker screen system of the present invention is a reflection type screen, and a driving unit for driving the reflection type screen from the back, and the reflection type screen. In a screen speaker system including a cabinet covering a back surface, the driving unit includes a plurality of electro-acoustic transducers and is attached to at least a peripheral portion of the screen, and the cabinet includes at least one or more cabinets provided near a center. And a partition between the screen and the cabinet, the partition having a plurality of electroacoustic transducers attached to the periphery of the screen that can be hermetically sealed at the periphery of the screen. It is.

Operation The present invention can provide a thin bass speaker system having a small vibration displacement because the same diaphragm is partially driven to be closed and the other portion is driven to be opened,
In addition, since the surface of the diaphragm is a reflective screen, it is possible to project images on the surface of the diaphragm without deteriorating sound as it is, without blurring when vibrating. A speaker screen system that can be used in places where there are restrictions on the target can be provided.
Furthermore, this speaker screen system is arranged at the center as a speaker dedicated to low-frequency sound, and a speaker screen system with a sense of reality can be realized in which left and right high-frequency speakers of left and right channels are arranged.

Embodiment Hereinafter, a speaker screen system according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a conceptual diagram of a speaker screen system according to a first embodiment of the present invention. In FIG. 1, 7 is a cabinet having at least one or more back holes near the center, 8 is a flat diaphragm, 9 is a reflection type screen for displaying an image, and is a sheet-like sheet attached to the surface of the diaphragm 8. Or a layered structure in which the surface of the diaphragm 8 itself is processed and processed into a screen shape. Reference numeral 10 denotes an electro-mechanical converter including a magnet and a voice coil, and the diaphragm 8 and the diaphragm 8 are connected via a voice coil bobbin and the like.
Construct an electro-acoustic converter. 11 is a closed cabinet sealed by an electro-acoustic converter, a screen, and a partition provided in the periphery of the screen, 12 is an open back hole provided in the vicinity of the center, A is a forward radiating sound, B is a rear surface of the reverse phase diaphragm. Radiated sound. Others are the same as FIG.

The speaker screen system configured as described above will be described with reference to FIG.

An image fixed to the surface of a large-area flat diaphragm 8 attached to the front of a thin and large cabinet 7, or the surface of the diaphragm 8 itself is a screen 9, and an image projected from the projector 5. Light 6 is projected on this screen. The plurality of electro-mechanical converters 10 include the diaphragm 8
The diaphragm 8 is vibrated by an electric input to the electro-mechanical converter 10 at the back of the diaphragm. At this time, since the closed cabinet 11 is provided in the periphery and the open back hole 12 is provided in the vicinity of the central portion, the position between the front radiation sound A and the reverse-phase diaphragm rear radiation sound B wrapping around from the periphery is output. The phase difference is increased, the sound is prevented from being canceled out, and the output sound pressure level of the low sound even with a small fluctuation of the diaphragm 8 can be increased even if the thickness is thin. The vibration displacement at this time is extremely small, and even if an image is taken, there is almost no blur.

As described above, according to the present embodiment, the same diaphragm provided with a screen on the front has a configuration in which a part is a closed drive system and another part is an open drive system.
A speaker screen system capable of projecting an image having a low output sound pressure level with a large out-of-focus and without defocusing, and having little spatial restriction without sound deterioration can be provided.

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a conceptual diagram of a speaker screen system showing a second embodiment of the present invention.

In the figure, 13 is a concave diaphragm, 14 is a concave screen for photographing an image provided on the front surface of the concave diaphragm 13, a sheet pasting shape, or such that the surface itself of the concave diaphragm 13 becomes a screen. This is a processed layer that has been processed.
Other parts are the same as those in FIG. 1 in that a concave diaphragm 13 and a concave screen 14 are provided in place of the planar one.

In FIG. 2, the acoustic operation is the same as that of FIG. 1. The speaker system is thin but has a large output sound pressure level. Further, since the concave screen 14 is provided on the concave diaphragm 13, The image is not deteriorated, and the concave screen 14 can project a brighter image than the flat screen.

As described above, by providing a concave screen on the front of the concave diaphragm, it is thin, has a high output sound pressure level of low sound, and can project a brighter and clearer image, and has no spatial deterioration without sound deterioration. Speaker screen system with less noise.

FIG. 3 is a conceptual diagram of a speaker screen system showing a third embodiment of the present invention.

In the figure, 15 is a speaker cabinet, 16 is a bass speaker screen, 17 is a left channel treble speaker, 18 is a left channel middle speaker, 19 is a right channel treble speaker, and 20 is a right channel middle speaker. is there. The front video image projector is omitted.

The speaker screen system configured as described above will be described with reference to FIG.

At the center of the thin and large speaker cabinet 15, a bass speaker screen 16 including a large-area diaphragm having a screen on the surface is arranged. The bass speaker screen 16 is the same as the speaker screen system of the first or second embodiment. The bass speaker screen 16 arranged at the center is driven monaurally as an acoustic signal.

In the bass region, there is not much difference even when driven in stereo, so that monaural driving is allowed.

On the other hand, the high-middle tone region needs to be clearly driven in stereo. Left and right channel loudspeakers 17 and 19 on the left and right of the bass speaker screen 16 for left and right channels, and middle and left and right channel speakers 18 and 20 respectively.
And drive. In this state, by transmitting image light from the front of the figure and projecting the image on the center bass speaker screen 16, it is possible to enjoy a large-screen image simultaneously with rich bass sound and rich realism. In this embodiment, a low-tone speaker screen having a screen of 70 inches was manufactured, and the image was transferred to the diaphragm screen. The vibration displacement of the diaphragm was only about ± 0.5 mm even at the time of large sound, and the diaphragm was viewed at a normal viewing distance. However, the angular resolution of the human eye was 2 minutes or less, and blurring of the image was not a problem at all.

As described above, the bass speaker screen is driven in monaural at the center, and the speakers for high and middle sounds are arranged for the left and right channels. System.

In the first and second embodiments, the electro-mechanical converter 10 has four
Although the number is set to a plurality, the number may be plural, and the number is not limited. Further, the number of open back holes is the same.

The structure and material of the screens 9 and 14 may be any structure and material that can provide a bright reflected light and have a wide viewing angle. For example, a screen in which the surface of a vinyl chloride sheet is subjected to Al processing, or an aluminum foil processed. There is a screen or a screen with a beaded surface.

Further, in the third embodiment, the high, middle and low loudspeakers are integrally formed, but the left and right high and middle loudspeakers may be separated. Further, it goes without saying that any kind and number of these loudspeakers for high / middle sound may be used.

As described above, according to the present invention, a part of the same diaphragm driven by the electro-mechanical converter has a closed drive system and another part has an open drive system. By using a speaker screen system with a reflective screen on the surface, it is possible to project a clear image on the screen on the surface of the diaphragm, which is thin but has a large output sound pressure level of low sound, and the sound is deteriorated. In addition, you can enjoy a realistic AV system when driving stereo.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a speaker screen system according to a first embodiment of the present invention. FIGS. 2 and 3 are conceptual diagrams of speaker screen systems according to second and third embodiments of the present invention. 1 is a conceptual diagram of a conventional speaker screen system. 7 cabinet, 8 diaphragm, 9 screen, 10 electromechanical converter, 11 closed cabinet, 12 open back hole, A front reflected sound, B reverse phase Radiation sound at the back of the diaphragm, 13 ... Concave diaphragm, 14 ... Concave screen, 15 ... Speaker cabinet, 16 ... Speaker screen for bass, 17 ... Speaker for left channel treble, 18 ... Speaker, 19: Right channel treble speaker, 20 ... Right channel middle speaker.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kazuei Sato 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Tsuneo Tanaka 1006 Kazama Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co. Inside the company (72) Inventor Mitsuhiko Serikawa 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Person Yoichi Kimura 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture, Japan Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Shuichi Obata 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) 77179 (JP, U) Hirakai 1-171191 (JP, U)

Claims (1)

(57) [Claims] 1. A screen speaker system comprising a reflection type screen, a driving unit for driving the reflection type screen from the back, and a cabinet covering the rear side of the reflection type screen, wherein the driving unit comprises a plurality of driving units. An electroacoustic transducer, which is attached to at least the periphery of the screen, wherein the cabinet has at least one or more back holes provided near the center, and the screen is provided between the screen and the cabinet. A speaker screen system comprising a partition wall which allows a plurality of electro-acoustic transducers attached to a peripheral portion to be sealed at a peripheral portion of the screen.