JP2513487Y2 - Speaker system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention eliminates standing waves generated between opposing speakers to prevent acoustic deterioration due to the standing waves and can change directivity freely. The present invention relates to the speaker system.

[Outline of Device] A speaker or a vibrator similar to the speaker is attached back to back at the center of the baffle surfaces of the sealed type cabinet, which are opposite to each other. In a speaker system designed to be provided, a sound insulating plate for partitioning the vibrators mounted back to back is provided in the cabinet, and an attenuator for varying the acoustic force of one of the vibrators with respect to the other is provided. Thus, the sound insulation plate is used to divide the cabinet into two parts, and a structure similar to that in which a vibrating body is attached to each of the cabinets is adopted, and the acoustic force of one vibrating body affects the acoustic force of the other vibrating body. It was made possible to obtain a desired directivity characteristic by preventing it.

[Prior Art] A desired rear surface disclosed in Japanese Utility Model Laid-Open No. 59-69519 is disclosed as a speaker system in which a direct radiation type speaker is used to realize desired directivity characteristics such as unidirectionality. Open speaker system and Japanese Patent Publication No. 50-28817
The negative-phase drive type speaker system described in Japanese Patent Publication is widely known.

As shown in FIG. 5, the speaker system of the former (Japanese Utility Model Publication No. 59-69519) has a direct emission type speaker 1 mounted on the front surface of a cabinet 2 and an opening 3 provided on the rear surface thereof. 3 is provided with an acoustic resistor 4 so that the sound waves emitted from the front side and the back side of the diaphragm of the speaker 1 are in opposite phase to each other, thereby providing a unidirectional characteristic. There is.

The latter speaker system (Japanese Patent Publication No. 50-28817) has a structure in which the speakers 1 and 1 are mounted back to back at the central portions of the baffle plates 2a and 2b of the cabinet 2 facing each other, as shown in FIG. By driving these speakers 1 and 1 in opposite phase, it is possible to have unidirectionality.

[Problems to be Solved by the Invention] In the former (open rear type) speaker system, the paths of sound waves radiated from the front and rear surfaces of the diaphragm of the speaker 1 are complicated, and the cabinet 2 is also used.
Since there are many corners inside, a secondary wave is generated due to diffraction (diffraction), so that the spatial region of opposite phase at equal sound pressure is extremely limited, and it spreads over a wide frequency band. Therefore, it is difficult to make it unidirectional, and it is actually extremely difficult to properly control the acoustic force radiated from the rear surface of the diaphragm over a wide band with the acoustic resistor. , The latter (Japanese Patent Publication No. 50-
The speaker system of Japanese Patent No. 28817) has an advantage of not using an acoustic resistor, but on the other hand, since sound waves are radiated from two speakers 1 and 1 in one cabinet 2, these sound waves are generated. There is a problem that it is difficult to obtain a desired directivity characteristic due to mutual sound (interference).

The present invention has been made for the purpose of solving the above-mentioned conventional problems and providing a speaker system capable of obtaining a desired directivity characteristic.

[Means for Solving Problems] A speaker or a variable output vibrating body similar to the loudspeaker is mounted back to back in the central part of the baffle surfaces of the sealed type cabinet that face each other, and these vibrating bodies are driven in opposite phases to each other. In the speaker system configured as described above, a sound insulation plate that partitions the vibrating bodies mounted back to back is provided in the cabinet, and an attenuator that varies the acoustic force of one of the vibrating bodies with respect to the other is provided. It was

[Operation] Since the closed type cabinet is divided into two parts by the sound insulation plate, and the vibrating body is attached to each part,
It is possible to prevent the acoustic force (sound wave) radiated from one vibrating body from adversely affecting the acoustic force of the other vibrating body.

Further, the directivity can be freely changed by changing the acoustic force of the one vibrating body relative to the acoustic force of the other vibrating body by the attenuator.

[Embodiment] Next, an embodiment of the speaker system of the present invention will be described with reference to the drawings.

1 and 2 are a front view and a sectional view showing a first embodiment. In the figure, 11 is a speaker system according to the first embodiment of the present invention. The speaker system 11 is a closed type cabinet 12 and a baffle surface of the cabinet 12 which is opposed to each other.
Speakers 15 and 16 attached to 13, 14 respectively, a sound insulating plate 17 attached between these speakers 15 and 16, and a cabinet 12 are hollowly supported to minimize adverse effects due to reflected waves from the speaker installation surface. It consists of a stand 18 and a stand.

The cabinet 12 is formed in a cylindrical shape, and circular baffle surfaces 13 and 14 are provided so as to close both ends thereof. Also, the speakers 15 and 16 are the circular baffle surface 13,
They are mounted back to back in the center of 14 with their axes aligned, and are driven in opposite phases to each other, and at least one of the acoustic forces can be varied by an attenuator 19. There is. The sound insulating plate 17 is attached to the axial center of the cylindrical cabinet 12 so as to divide (separate) the cabinet 12 into two chambers (small cabinets) 12a and 12b in the axial direction. ing. The stand 18 is composed of a base portion 18a and a pole portion 18b that is erected on the base portion 18a so as to be capable of expanding and contracting and rotating. The pole portion 18b hollowly supports the cabinet 12 or the speakers 15 and 16. It is becoming like this.

The speaker system of the first embodiment has the above-mentioned structure, and the cabinet 12 is divided into two chambers 12a and 12b by the sound insulation plate 17, and one chamber 12a has the speaker 15 and the other chamber 12b. Since the other speaker 16 is attached to the speaker 16, the acoustic power radiated from the speaker 15 into the cabinet 12 is literally shielded by the sound insulation plate 17, and similarly the acoustic power of the other speaker 16 is also insulated. Blocked by the plate 17 prevents the acoustic forces of these two speakers 15 and 16 from affecting (interfering) with each other. Therefore, the conventional problem that the acoustic forces of the two speakers 15 and 16 influence each other and it is difficult to obtain a desired directivity characteristic as in the conventional case is solved. Further, by changing the acoustic power of one of the speakers 15 and 16 by the attenuator 19, it is possible to freely change the directivity in the order of non-directionality → unidirectionality → bidirectionality.

FIG. 3 shows a second embodiment of the speaker system 11 of the present invention. In this embodiment, the cabinet 12 is formed into an elliptical cross section so that the corners (corners) are reduced as much as possible. This shows a case where the generation of secondary waves due to (diffraction) is reduced to make it easier to obtain unidirectionality. The other components are the same as those in the first embodiment.

FIG. 4 shows a third embodiment of the speaker system 11 of the present invention, in which a hanger 20 is used instead of the stand 18 to suspend the cabinet 12. The other components are the same as those in the second embodiment.

In the embodiment shown in the drawings, one speaker 15, 16 is attached to the central part of the baffle surfaces 13, 14, but n (several) speakers are attached to each of the baffle surfaces 13, 14. May be. In this case, it is advisable to disperse them equally in the 2π / n direction and to attach them to the center of the baffle surface as much as possible. The attenuator 19 may be a fixed type instead of a variable type so as to have a certain directivity (unidirectionality).

[Effects of the Invention] As described above, according to the present invention, a speaker or a vibrating body similar to the loudspeaker is attached back to back at the center of the baffle surface of the sealed type cabinet, which are opposite to each other. In a speaker system which is designed to be driven, a sound insulating plate for partitioning the vibrators mounted back to back is provided in the cabinet so that the acoustic forces of the vibrators driven in opposite phases influence each other ( Interference) to prevent acoustic deterioration due to mutual interference. Further, the attenuator has an effect that the directivity can be freely changed by changing the acoustic force of one vibrating body relative to the other acoustic force.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a speaker system of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 is a sectional view of a second embodiment, and FIG. 4 is a perspective view of a third embodiment. 5 and 6 are sectional views of a conventional example. 11 …… Speaker system, 12 …… Cabinet, 13,1
4 …… Baffle surface, 15,16 …… Speaker, 17 …… Sound insulation board.

Front page continuation (72) Inventor Shinichi Watanabe 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Inc. (72) Inventor Matsudaira 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony stock In-house (56) Bibliography Showa 50-16925 (JP, U) Showa 56-128782 (JP, U) Japanese Patent Showa 50-28817 (JP, B1) Showa 51-38353 (JP, Y1) )

Claims (1)

(57) [Scope of utility model registration request] 1. A speaker in which a speaker or a vibrating body similar thereto is mounted back to back at the central portions of baffle surfaces of a closed cabinet that face each other, and these vibrating bodies are driven in opposite phases to each other. In the system, a sound insulation plate for partitioning between the vibrators mounted back to back,
A speaker system comprising: an attenuator provided in the cabinet and changing an acoustic force of one of the vibrators with respect to the other.