JPH01171398A - Acoustic device - Google Patents

Abstract

PURPOSE:To reinforce a low area without degrading a sound quality by providing an electric oscillation converting means to generate acoustic oscillation and an antenna member, which is connected to the converting means and has flexibility, generating resonance to obtain a resonating frequency as a peak in the antenna member with the acoustic oscillation and oscillating whole the antenna member simultaneously. CONSTITUTION:A tube 4 to be the antenna member is fit to a lower fitting member and an upper fitting member. The tube 4 is composed of a plastic material and formed in a bellows shape. Then, it has the flexibility. An electrical signal given to a signal line 12 is converted to the acoustic oscillation in a speaker 5 and transmitted through an aperture 9a to an external part. On the other hand, this acoustic oscillation oscillates air in the tube 4 and it is propagated in the tube 4 as a pressure wave and transmitted through an aperture 8a to the external part. The surrounding frequency is also reinforced with the level of the tone of the resonating frequency, which corresponds to the length of the tube 4, as the peak, however, the peak is suppressed by the oscillation of the tube 4. Accordingly, the peak of the tone is suppressed in the resonating frequency and a smooth reinforcing characteristic without a sharp peak can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an acoustic device that converts an electric signal into an acoustic vibration of 1JJ, and particularly to enhancement of low frequency band reproduction thereof.

[Prior Art] Fig. 9 shows a conventional acoustic device shown in the 50th year history of O.D. (171 books published by the Audio Association, p. 398). The cabinet 1 is provided with frontages 1a and lb. The opening 1111a has 2 speakers and 14 speakers.
A duct 3 made of a rigid body is attached to the opening 1b. A plurality of ducts 3 are provided, and each duct 3 is set to resonate at a different frequency. At the resonant frequencies of the ducts, the sound level is greatly enhanced.

Since a plurality of ducts ([M1) are thrown, the peaks as a whole are lined up continuously and are amplified in a wide frequency band.In other words, an efficient flat acoustic output can be obtained.

[Problems to be Solved by the Invention] In the conventional device as described above, in order to enhance low frequency band reproduction, it is sufficient to provide a duct having resonance J and 71 wave loss in the 1 degree frequency band. In the low frequency R' range, that is, the long wavelength band, the duct corresponding to this also becomes long. Therefore, it is difficult to arrange multiple ducts due to the size of the cabinet.

If only one duct is used in one nozzle, the resonance peak value will rise too steeply, and the force fO will rise only at the peak frequency, resulting in poor sound quality.

In view of the above-mentioned problems, it is an object of the present invention to provide an audio device that can enhance reproduction of low frequency bands without deteriorating sound quality.

[Means for Solving the Problems] The acoustic device according to the present invention includes an electric vibration converting means for generating sound @v) and a flexible hollow member connected thereto.

[Operation] The acoustic vibration generated by the heavy L vibration converting means generates resonance with the resonance frequency at its peak inside the hollow member, and the frequency of the 161st side is also increased by 1 tlJ, and at the same time, the entire hollow member is vibrated. This vibration of the wall surface of the hollow member damps the standing wave inside the hollow member, which is the source of resonance, suppresses the peak, and creates a gentle enhancement characteristic. Furthermore, the vibration of the hollow member itself becomes a source of acoustic vibration.

[Embodiment] Fig. 1 and Fig. 2 show an acoustic device according to an embodiment of the present invention. Fig. 1 is a sectional view, and Fig. 2 is a perspective view. A tube 11, which is a hollow member, is attached to a lower attachment member 7 and an upper attachment member 8. The lower mounting member 7 and the upper mounting member 8 are held by struts 10. The pipe 4 is made of a plastic material (nylon, polyethylene, polystyrene, AS resin, polypropylene, vinyl chloride FJMR, etc.),
J shown in the figure: It is formed into a sea urchin bellows shape and has flexibility. The lower mounting member 7 is fixed to the upper part of the housing 9 together with the buckle plate 6. The buckle plate 6 has an opening [-16
A is provided, and a speaker 5, which is an electric vibration converting means, is attached to this. That is, the speaker 5 is provided at the lower end of the tube 1, and the wire is opened at the negative end of the tube 1. On the rJllj surface of the housing 9, I) 1109
a is provided and covered with a net 11.

The '@multiple signal applied to the signal line 12 is converted into acoustic vibrations at the speaker 5. This sound? ! P anonymous history J is transmitted to the outside through the opening 9a. On the other hand, this sound 151
The vibration vibrates the air in the tube 4, generates a pressure wave in the tube 4, and transmits it to the outside through the tail ITI 8a. The tube 4 vibrates due to this pressure wave. The sound level at the resonant frequency corresponding to the length of the tube 4 peaks, and surrounding frequencies are also enhanced. but.

This enhanced sound level peak is suppressed by the vibration 11 of the tube 4. Therefore, the sound peak at the resonant frequency is suppressed, resulting in a gentle enhancement characteristic without steep peaks. FIG. 3 shows the results of measuring frequency characteristics using the apparatus according to this embodiment.

In addition, the sound is transmitted through the opening 9a of the housing 9 and the upper part mounted at the m of the member 8.
It is delivered to the outside through one port 8a and the tube ll itself. Therefore, the sound radiates from a large area, increasing its impact on the listener's auditory senses.

FIG. 1 shows another embodiment. In this example, tube 4
A speaker 5b is attached not only to the lower end but also to the upper end. By attaching the speakers 5a and 5b to both ends of the tube 4 in this manner, direct sound is increased. Furthermore, tube 4
The internal pressure wave formation force f becomes stronger and more reliable, increases the vibration force of the tube 4, and increases the acoustic radiance = tm.Therefore, the gentle acoustic characteristics are maintained without impairing the peak suppression effect. You can increase overall efficiency.

FIG. 5 shows implementation 1 in which the upper end of the tube 4 is closed.

According to this implementation νσ, even if the device is the same size as the case with the top open, the acoustic characteristics (peak frequency, volume, etc.)
You have the power to change. Further, in the apparatus shown in FIG. 1, if a lid is provided separately to close the upper end, acoustic characteristics for both open and closed states can be obtained.

Further, instead of closing the upper end of the tube 4 with a rope, a diaphragm 20 (for example, a drone cone) may be provided. In this implementation η11, the diaphragm 20 is vibrated by the pressure wave inside the tube 4, and this diaphragm 20 also derives r\/l/.

If you want to increase the height of the device by 1rU due to the installation location, etc., the embodiment shown in FIG. 7 is preferable. The pipe 11 is bent and attached so as to connect the opening 9y. A speaker 5 is attached to the opening 9x. By bending the tube 4 in this way, the length of the device can be increased by one degree without changing the length of the tube 4. In addition,
A partition plate may be provided in the central portion 9m inside the housing 9.

FIG. 8 shows an embodiment in which the speaker 5 and the pipe 11 are attached to a mounting plate 30. The mounting plate 30 is, for example, a rear parcel I/lay of a passenger car or the like.

The mounting plate 30 is provided with an opening 30x and an opening ]Oy,
The pipe 4 is bent and attached so as to connect the opening 30X and the opening 30y. A speaker 5 is attached to the opening 30x.

[Effects of the Invention] The acoustic device according to the present invention includes a flexible hollow member connected to electric vibration converting means. Therefore, it has the following effects.

First, the vibration of the flexible hollow member suppresses the resonance peak. It is possible to make the low range extremely strong without deteriorating the sound quality.

Second, due to the vibration of the hollow member, sound can be radiated from the entire hollow member, resulting in rich and efficient reproduction! can.

Thirdly, since the =r flexible hollow member is used, it is easy to arrange the hollow member according to the shape of the casing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an acoustic device according to an embodiment of the present invention;
2 is a perspective view of the device shown in FIG. 1, FIG. 3 is a diagram showing the frequency characteristics of the device shown in FIG. 1, FIG. 1 is a diagram showing an example in which two speakers are provided, and FIG. The figure shows an example in which one end of the tube is closed. Figure 6 shows an example in which a diaphragm is provided at one end of the tube. Figure 7 shows an example in which the tube is bent. FIG. 8 is a diagram showing an embodiment in which a tube/speaker is attached to a mounting plate, and FIG. 9 is a diagram showing a conventional acoustic device. 4...Tube 5...Speaker Note that the same reference numerals in each figure indicate the same or corresponding parts. Representative Patent Attorney Takashi Higashishima'F: (2 A) 4: Suga
Figure 1 Figure 2 Example 1 Figure 4 Figure 5 Figure 6 Rib Figure 9

Claims (5)

[Claims] (1) An acoustic device comprising: an electric vibration converting means that generates acoustic vibration; and a flexible hollow member having at least one end connected to the electric vibration converting means. (2) The acoustic device according to claim 1, wherein the other end of the tube is open. (3) The acoustic device according to claim 1, wherein an electric vibration converting means is also provided at the other end of the tube. (4) The acoustic device according to claim 1, wherein the other end of the tube is closed by a rigid body. (5) The acoustic device according to claim 1, characterized in that a vibrating body is provided at the other end of the tube.