JPS62168199A - Sound transmitter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a sound transmission device that transmits sound using resonance.

[Background technology]

BACKGROUND ART Recently, the sound insulation properties of walls that partition the inside and outside of a room, walls between rooms, ceilings, floors, etc. have been attracting attention. Conventional sound insulating walls are intended to insulate all frequency bands.

In general, according to the law of mass, the sound insulation properties of sound insulation walls are poor in low-frequency sound ranges, but this does not mean that sound in a certain frequency band will pass through, which is a resulting phenomenon.

In particular, blocking sounds such as telephone bells and emergency bells can interfere with daily life, so it was necessary to actively transmit sounds in these frequency bands while blocking sounds in other frequency bands. However, based on this idea, no device has been proposed that transmits only sounds in a required frequency band.

(Object of the Invention) An object of the present invention is to provide a sound transmission device that can transmit only sound in a required frequency band and block sounds in other frequency bands.

[Disclosure of the invention]

The sound transmission device of the present invention includes a box having a pair of openings on the front and rear sides, a sound insulating plate that partitions the front and rear parts of the inside of the box, and a pair of sound insulating plates with the same resonant frequency arranged in the pair of openings of the box. diaphragms, a pair of elastic bodies having the pair of diaphragms attached to the pair of openings, and a vibration transmitting body passing through the sound insulation plate and connecting the pair of diaphragms.

According to the structure of the present invention, a pair of diaphragms having the same resonant frequency are attached to a pair of openings provided on the front and rear surfaces of the box through elastic bodies, and are connected by a vibration transmitting body that passes through the sound insulating plate. are doing.

Therefore, if a certain required frequency band is determined and the resonant frequency of a pair of diaphragms is matched to that frequency band, when sound in that frequency band is incident from either the front side or the rear side of the box, the pair of diaphragms will One of the diaphragms vibrates. The vibrations are transmitted to the other diaphragm via the vibration transmitter and resonate, and the sound in that frequency band is radiated from the other diaphragm. No resonance occurs with sounds in other frequency bands, and since the front and rear parts of the inside of the box are separated by a sound insulating board, the sound insulation is good and the amount of sound transmitted is very small.

Therefore, by transmitting only the sound of the required frequency band,
Sounds in other frequency bands can be blocked.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 and 2.

The sound transmission device 20 of this embodiment has a front surface 1a and a rear surface 1a.
A box 1 with a pair of openings 11 provided in b, a sound insulating plate 2 that partitions the front and rear parts of the inside of the box l, and a pair of diaphragms 3 with the same resonant frequency arranged in the pair of openings 11 of the box 1. and a pair of elastic bodies 4 in which the pair of diaphragms 3 are attached to the pair of openings 11, and a vibration transmitting body 5 that penetrates the sound insulation plate 2 and connects the pair of diaphragms 3. It is.

The box l is made of a wooden panel with an air space in the middle, and the pair of openings 11 are a front side opening 11a and a rear side opening 11.
It consists of b.

The sound insulation board 2 is made of concrete and has a through hole 2a in the center.
is provided and placed in the middle of the box 1.

The pair of diaphragms 3 is a front diaphragm 3a and a rear diaphragm 3b.
They are each formed in a conical shape protruding inward of the box 1, and are connected to each other by a vibration transmitter 5. Although the diaphragm 3 is made of aluminum honeycomb, it is preferable to use one that is lightweight and has high llllll properties, and other members may also be used.

The elastic body 4 is made of soft rubber.

Although the vibration transmitter 5 is made of aluminum alloy, other members may be used as long as they are lightweight and have high rigidity.

Here, regarding the diaphragm 3, the unique resonance frequency of each is determined by the area, mass, internal volume of the air layer, elasticity (elastic coefficient) of the elastic body 4, etc. of the diaphragm 3, and generally this resonance frequency f is expressed by the following formula.

ρ: Density of air (kg/n?) C: Speed of sound in air (m/s'ec) S: Effective area of vibrating part (n() myu: Effective mass of vibrating part (kg) ■= Inner volume of air layer (rrr) fo: lowest resonant frequency of the vibration system (fiz> At this time,
It is necessary that the resonant frequencies fr of the pair of diaphragms 3 match, and if the resonant frequencies rr match, S, m6, V of the diaphragms 3a and 3b, respectively.
, f, etc. may be different.

In order to use the sound transmission device 20 of this embodiment, basically, an opening is opened in the partition wall (not shown) between rooms or between the inside and outside of the room where only the sound of a certain frequency band is to be transmitted. and insert box 1. At this time, the partition wall needs to have high sound insulation properties.

Next, the resonance frequency of the diaphragm 3 may be adjusted so that the sound pressure increases at the frequency of the sound that is desired to be transmitted between rooms or between the inside and outside of the room.

For example, if a sound with a resonant frequency set by adjusting the diaphragm 3 is generated on the front surface 1a side of the box 1, the sound enters the diaphragm 3a, causing the diaphragm 3a to vibrate. The vibrations are transmitted to the diaphragm 3b via the vibration transmitter 5 and resonate, and sound in that frequency band is radiated from the diaphragm 3b. Sound in other frequency bands does not resonate, and since the front and rear parts of the box 1 are partitioned by the sound insulating plate 2, the sound insulation is good and the amount of sound transmitted is very small.

When a sound with a resonant frequency is generated on the rear surface 1b side of the box 1, the sound travels through the opposite transmission path to the case where the sound is transmitted from the front surface 1a side.

Therefore, according to the sound transmission device 20 of this embodiment, only the sound in the required frequency band can be transmitted, and the sound in the other frequency bands can be blocked.

Further, in this embodiment, the box 1 can be freely removed and the resonance frequency can be easily adjusted.

In this embodiment, the diaphragm 3 is placed on the front surface 1a of the box 1.

Although one location is provided for each on the rear surface 1b, a plurality of locations may be provided, and in that case, it may be used for multiple purposes such as one for the bass range and one for the treble range.

The sound transmission device of this embodiment can be used for the following purposes.

■　Hearing the emergency call that went off in the child's room in the master bedroom.

■ Listening to the telephone ringing in the hallway with the door closed in the living room.

■Communication with sites such as underground construction and tunnel construction.

■ Old people can hear intercoms, chimes, and time signals without misinterpreting them.

Another embodiment of the invention is shown in FIG.

The sound transmission device of this embodiment is the same as the one described above except that the box 1 of the previous embodiment is separated into a front side box body 21 and a rear side box body 31, and a partition wall 30 of a building is used as the sound insulating plate 2. Since it has the same configuration as the example, the same parts are given the same reference numerals and the explanation will be omitted. Note that 30a is a through hole through which the vibration transmitting body 5 is inserted.

The front box 21 and the rear box 31 are each bonded to the partition wall 30 with an adhesive.

This embodiment has the same structure as the previous embodiment except that the partition wall 30 is used as the sound insulating plate 2, so it has the same effect as the previous embodiment.

〔Effect of the invention〕

According to the sound transmission device of the present invention, a pair of diaphragms having the same resonant frequency are attached to a pair of openings provided on the front and rear surfaces of the box through elastic bodies, respectively, and a vibration transmission body that penetrates the sound insulation plate is used. It is connected.

Therefore, if a certain required frequency band is determined and the resonant frequency of a pair of diaphragms is matched to that frequency band, when sound in that frequency band is incident from either the front side or the rear side of the box, the pair of diaphragms will One of the diaphragms vibrates. The vibrations are transmitted to the other diaphragm via the vibration transmitter and resonate, and the sound in that frequency band is radiated from the other diaphragm. Sound in other frequency bands does not cause resonance, and since the front and rear parts of the inside of the box are separated by a temporary sound insulator, the sound insulation is good and the amount of sound transmitted is very small.

Therefore, by transmitting only the sound of the required frequency band,
Sounds in other frequency bands can be blocked.

[Brief explanation of drawings]

FIG. 1 is a perspective view of one embodiment of the invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a sectional view of another embodiment of the invention. l...box, 2...sound insulating plate, 3...diaphragm, 4...
・Elastic body, 5... Vibration transmission body

Claims (1)

[Claims] A box with a pair of openings on the front and rear sides, a sound insulating plate that partitions the front and rear parts of the box, a pair of diaphragms with the same resonant frequency arranged in the pair of openings of the box, and A sound transmission device comprising: a pair of elastic bodies having diaphragms attached to the pair of openings; and a vibration transmission body passing through the sound insulation plate and connecting the pair of diaphragms.