JP3348358B2 - Stacked multi-tube speaker system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacked backload structure in a speaker system device and a reverberation reaction plate attached thereto. (Prior Art) Among speaker systems, an enclosure system, The closed type and the back load system are three typical examples. The enclosure system has a speaker embedded in the front panel of the box, a sound absorbing material is stretched inside, the high temperature and the medium sound are eliminated by the sound absorbing material from the sound generated on the back of the speaker, and only the heavy bass is reproduced from the front opening. It is a mechanism that works. Sound turbidity is likely to occur. In addition, the sound pressure is reduced by the amount of the erasure. In the closed type, the speaker is embedded in the front panel of the box and there is no opening in the front. Therefore, the sound generated on the back of the speaker is not reproduced. This is a treatment that dislikes sound turbidity. The loss of sound on the back, ie in the box, is large. Although the sound is transparent, it cannot be supplemented unless the speaker grade is raised to the next level as much as the sound pressure decreases. Since the sound on the back is not reproduced, the three-dimensional effect is rare. The basic structure of the backload system is as shown in (Fig. 13). The sound generated on the back of the speaker is designed to draw deep bass into the front opening while bypassing the back load. However, also in this case, opacity and resonance are not perfect.

[Problems to be solved by the invention]

As described above, many of the prior arts devised speaker systems with live performance in mind. But the source of sound in a speaker system is the speaker, not the orchestra or band. Therefore, the system must be capable of maximizing the characteristics of the speaker. That is, an overall problem of the speaker system to be solved by the present invention is to reproduce the characteristics of the speaker as the source sound as faithfully as possible. Theoretically speaking, when the sound of a speaker is taken as a cycle wave, the sound generated from the front (front surface) of the speaker is defined as a plus wave sound from 0 to 180 degrees, and the speaker sound is defined as a minus wave sound from 180 to 360 degrees. Sound generated on the back side of The prior art completely eliminates or uses only a part of this back sound, that is, the negative wave sound. Creating such a system would negate the characteristics of the speaker, but this symbolizes the difficulty of combining plus and minus waves. If a time lag occurs or the sound is distorted when the plus wave sound and the minus wave sound are synthesized, this means that the sound is turbid and cannot be listened to anymore. The above is an overall problem to be solved by the present invention.

The following is a list of issues that we want to solve for back-load speaker systems.

The basic structure of the prior art FIG. 13 is a typical example, but this system has a long backload distance because the backload bypasses the front opening. A time gap is easily generated between a minus wave sound passing through the inside and a plus wave sound generated on the front of the speaker, which causes the sound to be clouded.

Therefore, it is impossible to return 100% of the negative sound generated on the back side of the speaker, and the sound absorbing material is used to eliminate the high and middle frequency ranges, thereby reproducing only the deep bass. Needless to say, the sound pressure is reduced by the amount deleted.

Since the outlet of the backload sound, that is, the front opening is located at a different position from the speaker, the sound cannot be united and a transparent sound cannot be reproduced.

[Means for solving the problem]

In the present invention, as described above, in order to solve these problems over the entire speaker system, the entire amount is returned and reproduced as an audible sound without erasing the minus wave generated on the back surface of the speaker. The basic structure of the present invention is as shown in FIG. 1, FIG. 2, FIG. 3, and FIG. As shown in Fig. 1, the inner cylinder 1 and the outer cylinder 2B were superposed, and a reverberation reaction plate was installed at the rear of the system.
Therefore, the negative wave sound generated on the back of the speaker goes through 3A, collides with 4 and is reversed, returns to 3C, and is led to the outer peripheral well of the front speaker.

The features are explained by item. The superimposed structure enables the road to be shortened and eliminates the gap at the time of combining the plus and minus waves.

Equipped with a reverberation reaction plate 4 at the rear. This is an elastic sheet-like material whose role is to reverse the sound due to recoil and eliminate the time difference due to speedup, faithfully transmit the original sound, and amplify the bass range.

The front opening of the backload is, of course, located on the outer periphery of the loudspeaker due to the stacked structure of the device. Since the exits of the plus wave sound and the minus wave sound overlap on the same axis, synthesis of a sound with a good sense of unity is achieved.

No sound absorbing material is used for the back load. No sound absorbing material is used from the viewpoint of faithfully reproducing the original sound, that is, from the viewpoint of making full use of the characteristics of the speaker. Therefore, a sound with a three-dimensional effect can be obtained without a decrease in sound pressure.

(Operation)

As described above, the backload is formed in a stacked structure, so that the device is shortened, and further, the negative sound generated on the rear surface is accelerated due to the reaction effect of the rear reverberation reaction plate.
The accelerated minus wave sound effectively acts to eliminate the time difference from the sound in front of the speaker, that is, the plus wave sound. The reverberation reverberation plate is also effective in transmitting the original sound faithfully and at the same time reproducing deep bass. Further, in this device, since the outlet of the plus wave sound and the minus wave sound overlap on the same opening at the front opening of the back load as described above, synthesis of sound with a good sense of unity is achieved. The full reproduction of the minus wave sound is also remarkable in emphasizing the stereoscopic effect of the sound.

〔Example〕

This system is designed mainly for small and medium-sized speakers, for example, a full-range type with a diameter of about 10 cm to 20 cm. Since the full range can be reproduced by one full range, it is good that two-way and three-way do not cause heterogeneous hybridization. 1 to 4 show a basic type of this system. The shape is long before and after, but this length is arbitrary. For example, assuming that a full-range speaker with a diameter of 10 cm is equipped, the volume is a compact one of about 3 to 6 liters in terms of volume. For very short ones, 1 liter to 1.5 liters is possible. As shown in FIG. 1 to FIG. 12, there are innumerable shapes such as a cylindrical shape, a rectangular tube type, a triple bent type, an elliptical shape, a hexagonal shape, and an octagonal shape. The principle is the same regardless of these shapes. It should be noted that a triple type, a bent type, and the like can be used for low-pitched sounds for large speakers. As the reverberation reaction plate, a sheet-like one is used, but it is necessary to pay attention to the selection of various materials.

〔The invention's effect〕

As described above, the synthesis of the plus wave sound and the minus wave sound is rational, and there is almost no turbidity of the sound. Since all the negative waves are recursively reproduced, the sound pressure does not drop. Therefore, the speaker characteristics could be faithfully reproduced. The sound is clear with enough bass. The sound pressure can be ensured to give a three-dimensional effect, and the sound is not distorted or clear even when the volume is raised to the maximum or at the minimum.

[Brief description of the drawings]

1 to 4 are cylindrical speaker devices, and FIG. 1 is a side sectional view. The arrows show the sound flow. FIG. 2 is a front view showing the mounting of the speaker. FIG. 3 illustrates a reverberation reaction plate which is important for reversing the sound in a rear view. FIG. 4 shows the whole image in a perspective view. FIG. 5 to FIG. 8 illustrate a triple cylindrical device bent in an L-shape. FIG. 5 is a side cross-sectional view, in which the outward path is singular and the return path is doubled. FIG. 6 is a front view, in which a speaker is attached to the tube at the end. FIG. 7 is a perspective view showing the whole image. FIG. 8 is a rear view. A diagram in which a reverberation reaction plate is attached to the outer cylinder is shown. FIG. 9 to FIG. 12 show a rectangular tube type device. 9, 10, 11, and 12 are exactly the same as those in FIGS. 1 to 4. FIG. 13 is a perspective view showing a typical one-way conventional back load system device. 1 ... inner cylinder 2A ... middle cylinder 2B ... outer cylinder 3A ... inner backload 3B ... middle backload 3C ... outer backload 4 ... back, reverberation reaction plate 5 ... speaker arrow indicates sound flow Is shown. The fixtures for the positions of the inner and outer cylinders are omitted.

Claims (1)

(57) [Claims] A sound generated on the back surface of the speaker is guided by an inner cylinder (1) directly connected to the speaker, and collides with a reverberation reaction plate (4) at a rear portion of the outer cylinder (2B). Return the back load (3C) formed by the outer cylinder (2B) and the inner cylinder (1) and the outer cylinder (2B) arranged so as to be led to the outer periphery of the speaker; 4) Stacked multi-tube speaker system using