JPH01183300A - Speaker - Google Patents

Abstract

PURPOSE:To obtain a speaker capable of emitting the natural sound of high Q by providing a partition plate at the sound generating part sides of plural resonance pipes attached to the sound generating part of the speaker. CONSTITUTION:A diaphragm vibrates in the sound generating part 37 so as to generate a prescribed sound wave, and the generated sound wave is emitted to an external part through the insides of plural tubular bodies 41, 43, 45. In this case, the tubular bodies of some number resonate specially, and said resonant sounds and the rest of the sounds having passed through other tubular bodies are mixed with each other, and the beautiful sound of a complicated waveform is generated. Because the partition plates 51, 53, 55 are provided between the tubular bodies 41, 43, 45 and the sound generating part 37, the length of an air column for determining a resonance frequency comes clear, and the speaker comes to be the one with the large Q as a whole, and the natural sound is obtained, and the speaker suitable to be used as the sound source of a musical instrument can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a pipe speaker having a plurality of resonance tubes, and a partition plate is provided on the sound generation section side of the plurality of resonance tubes attached to the sound generation section of the speaker. This provides a speaker that can radiate sound.
- [Prior Art] A horn-type speaker is a type of speaker that radiates sound waves from a diaphragm into space through a horn.

An example of a conventional application of this type of horn-type speaker is, for example, an automobile horn as shown in FIG.

The second horn consists of an electrically driven membrane (corresponding to a diaphragm) 1 coupled to a horn 3. Its drive mechanism is
It consists of an electromagnet 6, an armature 7, and an interrupter (9 ft). In the rest position, the terminals of the interrupter 9 are urged by the spring 11 into contact with the contacts 1:3 of the armature 7.

When the button 15 is pressed, the circuit 17 is closed and the current is transferred to the electromagnet 5.
, and the electromagnet 5 attracts the armature 7. When the armature 7 is attracted to the pole 19 of the electromagnet 5, the terminal of the interrupter 9 opens the circuit 17, and the force of the electromagnet 5 on the armature 7 is no longer exerted. In this state, the armature 7 returns to its original position due to the elastic recovery force of the membrane 10, and the terminals are brought into contact again. This process is repeated.

The cycle of this phenomenon is caused by membrane 1, armature 7, and horn 3.
repeated by a combination of resonant frequencies. The driving force acting on the armature 7 has a complex waveform.

The sound produced by the membrane 1 is therefore rich in overtones. Under this condition, the resonance characteristics of the horn 3 play an important role in determining the sound quality. Small throat 21 and gentle flare 23
A long horn 3 with a .

This is because the harmonic structure of its acoustic output is similar to that of musical instruments.

[Problems to be Solved by the Invention] However, in such conventional speakers (car horns), as shown in Fig. 6, the output sound pressure distribution as a whole is Problems arose in that the graph was flat, the Q was low, and the sound quality was different from that of a natural instrument, but more like an electric instrument.

Therefore, an object of the present invention is to provide a speaker that is well suited for natural musical instruments with high Q.

[Means for Solving the Problems] The present invention includes a sound generating unit that vibrates a diaphragm to generate sound waves, a case that houses the sound generating unit, and a case that is attached to the case so as to correspond to a plurality of pitches. a plurality of tubes that radiate sound waves from the sound generation section to the outside, and a partition plate provided perpendicularly to the axis of the tubes between these tubes and the sound generation section and having a through hole. The present invention provides a speaker equipped with.

[Operation] According to the present invention, the diaphragm vibrates in the sounding section to generate a predetermined sound wave. The generated sound waves pass through the interior of the plurality of tube bodies and are radiated to the outside. In this case, some of the tubes resonate in particular, and the resonant sound and the sound passing through the remaining tubes mix with each other, creating a beautiful sound with a complex waveform.

At this time, since a partition plate is provided between these tube bodies and the sounding section, this partition plate constitutes a node of a resonant air column in the sound wave inside the tube body. In other words, due to the presence of the partition plate, the length of the air column when determining the resonant frequency becomes clear, resulting in a speaker with a high Q value as a whole. The sound obtained at this time has an envelope pattern with extremely high periodicity in its spectral energy distribution, and its formants are very clear, making it easy to perceive the pitch.

As a result, the sound is so good that it can be distinguished from a distance even at low volumes.

[Effects] As described above, according to the present invention, it is possible to obtain a speaker that produces natural sounds and is suitable for use as a sound source for musical instruments. According to this speaker, it is possible to cover a desired sound range.

Further, according to the present invention, it is possible to provide a speaker that can easily transmit even small sounds.

Furthermore, the structure can be made simpler and cheaper to manufacture than when a plurality of speakers each having a partition plate and a sounding section are assembled into a single tube body. - [Example] Hereinafter, an example of a speaker according to the present invention will be described with reference to the drawings.

Figure 1 is a vertical sectional view showing a first embodiment of a speaker according to the present invention.

In this figure, 31 is a box-shaped case.

A space 33 with a predetermined volume is defined inside this case 31.

A mounting plate 35 that divides the space 33 into two vertically is disposed inside this space 33, and a speaker unit 37 is fixed through a mounting hole 36 approximately in the center of this mounting plate 3δ. This speaker unit 37 is installed in the mounting hole 36 so as to emit sound toward the upper space 33A inside the case 31.
is fixed. The speaker unit 37 is a combination of a well-known speaker having a diaphragm and an amplifier, for example. This speaker unit 37 constitutes a sounding section that vibrates its diaphragm to generate sound waves.

A plurality of resonance tubes 41, 43, and 45 are erected on the upper wall of the case 31, facing the speaker unit 37.

These resonance tubes 41.4'3.45 are formed of straight cylindrical tubes with different lengths and thicknesses, and each resonance tube 41.4'3.45
．． 45 each have a predetermined diameter and a predetermined length. The resonance tube 43 is the longest and thickest, and the resonance tube 45 is the shortest and thinnest. - Also, partition plates 51, 53, 55 are fixed to the end of the inner hole of each resonance tube 41, 43, 45 on the side where it is attached to the case 31, respectively. Note that the other end of the inner hole of each resonance tube 41, 43, 45 is open to the outside. This is a frontage for sound emission.

Therefore, a space 33A having a predetermined volume is formed between each partition plate 51, 63, 65 and the speaker unit 37. Note that a lower space 33 is provided on the bottom wall of the case 31.
A hole 57 is formed to communicate B with the outside.

These partition plates 51, 53, 55 are made of, for example, soft iron and have a predetermined thickness, and are connected to each resonance tube 41, 43, .
45 and is fixed perpendicularly to the axial direction (perpendicular to the pipe line). In addition, the central part of this partition plate 51, 53, 55 has an inner hole and the above-mentioned space 3.
A through hole 61 is formed in each case to communicate with 3A.

These through holes 61 are formed to have a circular cross section and a predetermined diameter. For example, the diameter of the through hole 61 is defined in relation to the inner hole.

Therefore, in this speaker device, the sound waves generated by the vibration of the diaphragm of the speaker unit 37 pass through the through holes 61 of the partition plates 51, 53, 55 and the resonance tube 41.
43. penetrates the internal hole of 45 and forms a standing wave of sound waves in the internal hole. That is, sound waves are repeatedly reflected between each partition plate 51, 53, 55 and the sound emitting opening, and air column vibrations with a predetermined resonance frequency are clearly formed inside these resonance tubes 41, 43, 45. and can emit high-Q sound. The partition plates 51, 63, 55 in this case constitute a reflection surface for the sound waves in the bore. And resonance tube 41.43
．． 45 is a straight pipe with the same cross-sectional opening area in the axial direction, so it constitutes a clear resonance with odd-numbered harmonics of the fundamental vibration.

Therefore, in the speaker device configured in this way,
By varying the resonance frequencies of the resonance tubes 41, 43, and 45, a sound source for, for example, a pipe organ can be constructed.

Second! 2 shows a speaker device according to a second embodiment of the present invention. ' What about this example? So, the case? A plurality of speaker units 73 and 75 are installed inside the case 7.
Resonance tubes as many as the number of pitches required for 1 81.83.85.8
7 is attached. Note that the other configurations are similar to those of the first embodiment.

Further, the number of the above-mentioned speakers 73, 75 does not necessarily correspond to the number of resonance tubes 8.
There is no need to make the number 1 correspond to 1:1. It is also a good idea to make it correspond to the sound range.

Therefore, according to this embodiment, it is possible to obtain a speaker device that allows more fine-grained control. Other operations are the same as those of the first embodiment.

In addition, in each of the above embodiments, the length of the resonance tube can also be made variable. For example, each resonance tube may be composed of an inner tube and an outer tube slidably fitted into the inner tube. For example, the length of each resonance tube may be made variable depending on the outside temperature.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a first embodiment of a speaker according to the present invention, FIG. 2 is a longitudinal cross-sectional view showing a second embodiment of a speaker according to the present invention, and FIG. 3 is a conventional speaker device. FIG. 31. . . . . . . . . . . . . Case, 37 φ . . . Speaker unit (sound generation section), 4L43.45 . . . 53
．． 55...Partition plate, 61...Through hole. Patent applicant Yamaha Corporation agent
Patent Attorney Kiyoshi Kuwai - 31゛Gase 41.4B, 45° Resonance Tube 37: Speaker Unit':) No. 17 '1 *Temporary cross-sectional view of t4I+ Figure 2 Cross-sectional view of the second example

Claims (1)

[Scope of Claims] A sound generating unit that vibrates a diaphragm to generate sound waves, a case incorporating the sound generating unit, and a case that is attached to the case so as to correspond to a plurality of pitches, and that generates sound waves from the sound generating unit. A plurality of tubes that radiate the sound to the outside, and a partition plate provided perpendicularly to the axis of the tubes between these tubes and the sounding section and having a through hole. speaker.