JPS646622Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a sound reproducing device.At the same time as the sound is reproduced by the speaker of the sound device, a mechanical vibration output is also obtained by the vibration unit, so that the user can experience this. In particular, the vibration unit emits low-frequency sound as well as vibrations, and even if a small speaker is used, it is possible to reproduce sound over a wide frequency range as a whole. It has been made possible.

(Prior art) The beauty of music in live performance is that in addition to the fundamental sound generated by the instrument, the many different harmonics that are generated reach the listener's ears, and in addition to this, there are also sounds in the so-called bass range. , in other words, the sound below about 150 hertz directly hits the viewer's body as vibration.

On the other hand, even in the case of reproduced music sourced from records or magnetic tapes, various improvements and innovations have been made to bring it closer to the music played live, and at present it is possible to obtain a fairly high degree of fidelity. However, there remained a further problem to be solved in terms of direct vibration transmission to the human body. Therefore, a device was invented in which a vibration unit that vibrates in response to an alternating current signal of an appropriate frequency was provided, and this vibration unit was attached to the construction material of a human body support (for example, the metal frame of a sofa).
(See Publication No. 3281).

However, in this invention, the vibration unit is attached to the metal frame of the sofa, etc., so when manufacturing the sofa, etc., it must be designed in this way from the beginning, and even if it is on the user's side, it must be designed in such a way from the beginning. I had the problem of having to purchase this sofa in addition to the regular sofa I had.

(Purpose of the invention) Therefore, there is a need for a device that can easily provide sound and vibration to sofas and the like without making any improvements.
JP-A-55-1999 was invented from this point of view.
There is an invention described in Publication No. 22755. Although the above-mentioned problems could be solved by this invention, if we review this invention now, we will find that sound reproduction is limited to speakers, and the vibration unit has a structure that only emits mechanical vibrations. In order to reproduce low-frequency sounds, it is necessary to increase the diameter of the speaker. Increasing the diameter of the speaker increases the size of the entire device.

The present invention was created in view of this point,
In addition to mechanical vibrations, the vibration unit also generates low-frequency sound, making it possible to reproduce sound over a wide frequency range even if a small-diameter speaker is used. .

(Structure of the invention) In order to achieve the above object, the present invention provides a vibration unit that generates mechanical vibrations in response to a low-frequency audio signal, and the vibration unit is made of a diaphragm whose front and back sides are covered with foam material. The speakers for the left and right channels are installed by cutting out the foam material on the front side of the left and right sides of the upper end of the diaphragm, and the speakers for the left and right channels are installed, and these are all covered with a skin, and each channel circuit for the stereo audio signal is connected through an amplifier. a mixing circuit for the left and right channels is provided, and the vibration unit is connected to the output side of the mixing circuit via a low-pass filter and an amplifier that pass only low-frequency audio signals. The vibration unit is configured to generate vibrations and low-frequency sounds, and the speaker reproduces sounds in a higher range than the range emitted by the vibration unit.

(Embodiment) Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. In Fig. 1, 1 is a chair, the back 2,
It is a common type having a seat part 3 and leg parts 4 supporting the seat part 3. The back 2 and seat 3 of this chair 1
The sound reproduction devices 5 and 6 according to the present invention are placed on top of the. The sound reproduction device 5 includes four vibration units 7 on one end side (lower side when in use).
is attached, and four speakers 8 and 9 are attached to the other end (upper side when in use). On the other hand, the sound reproduction device 6 placed on the seat 3
A vibration unit 10 is attached to one end side (the tip side when in use).

FIG. 2 shows the internal structure of the sound reproduction device 5 in FIG. 1. In this figure, 11 is a diaphragm made of foamed polyethylene (thickness 10 to 25 mm).
mm). Foamed polyethylene was used because it does not deform (does not dent) when external force is applied and is flame retardant.

Holes 12, 13, and 14 are bored in the diaphragm 11, and the left and right channel speakers 8,
9, and a vibration unit 7 which mixes the audio signals of both channels and is driven by the low frequency signal of the audio signals. The speakers 8 and 9 are located at upper and lower positions, and have grills 15 and 16 at the front, respectively. grill 15,1
6 is mounted using the mounting frames 17 and 18 of the speakers 8 and 9. The front and rear of the diaphragm 11 are sandwiched between urethane 19, and the outside thereof is covered with a skin 20. Vibration unit 7 of sound reproduction device 6
is also installed with almost the same structure, but while the speakers 8 and 9 have holes in the urethane material 19 on the front, this vibration unit 7 has holes in the urethane material 19 on the front.
It is buried inside.

FIG. 3 shows an example of a connection circuit between the vibration unit 7 and the speaker 8 (or speaker 9). In this figure, 21 is a left channel input terminal, and 22 is a right channel input terminal. A left channel speaker 8 is connected to the input terminal 21 via an amplifier 23, and a right channel speaker 8 is connected to the input terminal 22 via an amplifier 24. Each of these speakers 8 is connected to a switch circuit (not shown), so that switching with the speaker 9 or simultaneous operation can be selected for each channel.

Two input sides of a mix circuit 25 are connected to the input terminals 21 and 22. A low-pass filter 26 is connected to the output side of the mixer circuit 25.
A vibration unit 7 is connected via an amplifier 27. The low pass filter 26 passes frequencies below about 150 hertz.

This sound reproduction device 5, 6 configured in this way
For example, as shown in FIG.
It is placed on the seat 3 and used by inputting stereo signals to the input terminals 21 and 22. As a result, the left and right speakers 8 (or speakers 9) produce a stereo effect. In this case, since the left and right speakers 8 and 9 are located near the user's ears, speakers with a small diameter (in the example, the diameter is 66 mm and the depth is
(Using a 30mm Mylar cone), you can get very good sound quality.

The sound reproduction device 5 has two speakers 8 and 9 installed on the left and right sides, and two on the top and bottom.
Depending on the sitting height of the user, it can be switched and used as appropriate. This makes the structure much easier than a system in which one speaker is provided on each side, and the positions of the speakers are mechanically changed. Note that the speakers 8 and 9 provided above and below can be operated at the same time.

Since the speakers 8 and 9 are attached to a diaphragm 11 made of a plate made of foamed polyethylene, it is possible to obtain a good bump-full effect, and experiments have shown that balanced sound with an extended low range can be reproduced. has been confirmed. Furthermore, since the vibration units 7 and 10 themselves also emit sound, this sound and the sound of the speaker communicate at around 150 Hz as shown in Figure 4, resulting in a wide range of sound overall. I can do it.

(Effects of the invention) With the above-mentioned configuration, the present invention allows the vibration unit to sufficiently compensate for the lack of low frequencies even when using a small-diameter speaker that is difficult to reproduce low-frequency sounds compared to a large-diameter speaker. This has the effect of making it possible to reproduce sound over a wide frequency range as a whole. Since it has a simple structure, it is possible to easily obtain realistic reproduced sound and bodily vibrations. Furthermore, by making the whole into a unit, it can be applied to dental chairs, beauty chairs, etc.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the main part in FIG. 1, FIG. 3 is a circuit diagram, and FIG. 4 is a graph showing characteristics. 1...Chair, 5,6...Sound reproduction device, 7,1
0... Vibration unit, 8, 9... Speaker, 11
...Vibration plate.

Claims (1)

[Scope of utility model registration request] A vibration unit that generates mechanical vibration in response to a low-frequency audio signal is provided, and the vibration unit is attached to the lower end of a diaphragm whose front and back sides are covered with foam material, and the Speakers for the left and right channels are installed by cutting out the foam material on the front, and these are all covered with a skin, and each channel circuit for the stereo audio signal is connected to the left and right channel speakers via an amplifier to mix the left and right channels. a circuit is provided, and the vibration unit is connected to the output side of the mixing circuit via a low-pass filter that passes only low-frequency audio signals and an amplifier, and the vibration unit generates vibrations and low-frequency sound, A sound reproducing device characterized in that the speaker is configured to reproduce sound in a higher range than the range emitted by the vibration unit.