JPH0470199A - Phase inverting type speaker system - Google Patents

Abstract

PURPOSE:To use a whole baffle surface for sound radiation by providing an acoustic horn in front of a speaker unit, providing plural opening parts for a part of the acoustic horn and arranging a passive diaphragm for the opening part. CONSTITUTION:The acoustic horn 8 is provided in front of the speaker unit 1 and sound 4 radiated forward from the speaker unit 1 is guided to a baffle surface 7. The opening part 9 exist in a part of the acoustic horn 8 and the passive diaphragm 2 is installed at the opening part. Sound 5 radiated backward from the vibration of the speaker unit vibrates the passive diaphragm 2 and sound 6 radiated by vibration passes through the acoustic horn 8 and is radiated in a forward direction. Thus, sound radiation from the passive diaphragm 2 and that from the speaker unit 1 can share a sound radiation space. Thus, the baffle surface can efficiently be used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a passive radiator type phase inversion speaker system that can efficiently utilize the area of a baffle surface for sound radiation.

“Conventional technology” Conventionally, the back waves generated from the unit are transmitted using a passive diaphragm (
A passive radiator type phase inversion speaker system is known as a system that enhances bass reproduction by radiating bass to the front via a passive radiator (passive radiator).

Figure 5 shows, for example, "Speaker System (Bottom)" (written by Takeo Yamamoto, Radio Gijutsusha, first published on July 15, 1978) P
, 284 (Fig. 8, 34).
FIG. 1 is a cross-sectional view showing a radiator-type phase inversion speaker system.

In the figure, (1) is a speaker unit that radiates sound to the outside, (2) is a passive diaphragm driven by the speaker unit (1) and (7) back waves, and (3) is the speaker unit (1) and the above speaker unit (7). The cabinet (4) houses the passive diaphragm (2), etc., and the speaker unit (1)
), (5) is the sound radiated backward from the speaker unit (1), (6) is the sound radiated by the vibration of the passive diaphragm (2), and (7) is the sound radiated forward from the speaker unit (1). This is the baffle surface of the speaker.

In Figure 5, by vibrating the passive diaphragm (2) by the sound (5) radiated to the back of the speaker unit (1), the sound (6) is in phase with the sound radiated to the front (4). ) is emitted. The passive diaphragm (2) can vibrate at a low frequency by adjusting the mass of the diaphragm, so in addition to the sound radiated forward from the speaker unit (1), the passive diaphragm (2) ) The bass range can be enhanced by the amount of sound (6) radiated from (6).

[Problem to be solved by the invention E] The conventional passive radiator type phase inversion speaker system is configured as described above, and when a passive diaphragm is placed on the baffle surface as shown in Figure 5, requires an opening in the baffle surface for installing the passive diaphragm, and it is necessary to ensure a large area of the baffle surface.

This invention was made to solve the above-mentioned problems, and by making sound radiation from the speaker unit and sound radiation from the passive diaphragm share a sound radiation space, the entire baffle surface is covered. The purpose of this study is to obtain a passive radiator phase inversion speaker system that can be used for efficient sound radiation.

[Means for Solving the Problems] A passive radiator type phase-inverting speaker system according to the present invention includes an acoustic horn that opens toward the baffle surface on the front of the speaker unit, and a part of the acoustic horn that opens toward the baffle surface. By providing multiple openings and arranging a passive diaphragm along the shape of the horn in the openings, sound radiation from the speaker unit and sound radiation from the passive diaphragm can share the space inside the horn. It is something you can do.

[Function] The passive radiator type phase inversion speaker system according to the present invention has an opening in a part of the acoustic horn placed in front of the speaker unit built into the cabinet, and a passive diaphragm is installed in the opening. As a result, the sound radiation space from the speaker unit and the sound radiation space from the passive diaphragm are shared, thereby achieving efficient use of the baffle surface.

[Example] Hereinafter, this invention will be explained based on the drawings.

FIG. 1 is a sectional view showing a phase inversion type speaker system using a passive radiator method according to an embodiment of the present invention, and FIG. 2 is a front view of the speaker system shown in FIG. 1.

In the figure, (8) is an acoustic horn that guides the sound (4) emitted forward from the speaker unit (1) to the baffle surface (7), and (9) is an opening provided inside the acoustic horn (8). be. The other parts are the same as those of the conventional example, so the explanation will be omitted.

Next, the operation will be explained.

As shown in Fig. 1, in this invention, an acoustic horn (8) is installed in front of the speaker unit (1), and the sound (4) radiated forward from the speaker unit (1) is transmitted to the baffle surface (7). leading up to.

There is an opening (9) in a part of the acoustic horn (8),
A passive diaphragm (2) is installed in the opening. The sound (5) radiated to the back due to the vibration of the speaker unit (1) vibrates the passive diaphragm (2), and the radiated sound (6) passes through the acoustic horn (8) and is radiated forward. be done. Therefore, the sound radiation from the passive diaphragm (2) and the sound radiation from the speaker unit (1) can share the sound radiation space, and there is no need to secure the area of the passive diaphragm (2) on the baffle surface. , the baffle surface can be used efficiently.

In addition, in the above embodiment, the passive diaphragm (2) is placed in the opening (9).
is installed, but the acoustic port (10) is installed as shown in Figure 3.
A passive diaphragm (2) may be installed in the opening.

FIG. 4 shows an output sound pressure frequency characteristic diagram of the passive radiator type phase inversion type speaker system according to the present invention. In the figure, characteristic A indicates the output sound pressure frequency characteristic of the passive radiator type mutually inverting speaker system according to the present invention, and characteristic B as a reference example shows the aperture of the passive radiator type phase inverting speaker system according to the present invention. This shows the output sound pressure frequency characteristics of a closed-type speaker system with a closed speaker system. As is clear from the figure, the passive radiator type phase inversion speaker system according to the present invention is effective in reproducing bass sounds.

[Effects of the Invention] As described above, according to the present invention, an acoustic pawn with an open baffle surface is arranged in front of a speaker unit built into a cabinet, a plurality of openings are provided in a part of the horn, and the A passive diaphragm that follows the shape of the horn is placed inside the opening, which not only allows the entire baffle surface to be used efficiently for sound radiation, but also saves space by the area of the passive diaphragm, making it ideal for small cabinets. This has the effect of making it possible to play bass sounds.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a passive radiator type phase inversion speaker system according to an embodiment of the present invention, and FIG. 2 is a front view of the speaker system shown in FIG. 1.
FIG. 3 is a cross-sectional view of a passive radiator type phase inversion speaker system showing another embodiment of the present invention, FIG. 4 is an output sound pressure frequency characteristic diagram of the subikan stem, and FIG. FIG. 1 is a cross-sectional view showing a radiator-type phase inversion speaker system. In the figure, 1 is the speaker unit, 2 is the passive diaphragm, 3 is the cabinet, 4 is the sound radiated forward from the speaker unit, 5 is the sound radiated backward from the speaker unit, and 6 is the sound radiated from the passive diaphragm. 7 is a baffle surface, 8 is an acoustic horn, 9 is an opening, and 10 is an acoustic port. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a passive radiator type phase-inverting speaker system that includes a speaker unit that radiates sound to the outside and a passive diaphragm that vibrates due to the back waves of the speaker unit, the acoustic wave spreads out toward the baffle surface in front of the speaker unit. A horn is provided, a plurality of openings are provided in a part of the acoustic horn, and a passive diaphragm is placed in the opening along the shape of the horn, so that sound radiation from the speaker unit and the openings through the passive diaphragm are arranged. A passive radiator type phase inversion type speaker system characterized in that sound radiation from the horn and the sound emitted from the horn share a space inside the horn.