JP2684741B2 - Speaker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a speaker structure, and particularly to a speaker in which bass output is enhanced.

[Summary of the Invention]

The speaker of the present invention uses, for example, a hermetically-sealed speaker box as a baffle plate, disposes a passive radiator on the back surface of the diaphragm of the speaker at a predetermined distance, and the vibration of the passive radiator is transmitted to the diaphragm of the speaker. Since the air is emitted to the front side of the speaker from the opening of the ventilation hole arranged on the outer periphery of the speaker, the reproduction output of bass sound can be enhanced and the speaker system can be made compact.

[Conventional technology]

The lowest frequency of the acoustic wave reproduced by the speaker is generally limited by the lowest resonance frequency f ₀ of the diaphragm. Therefore, the speaker unit for bass is generally large in size and heavy in weight, and becomes expensive as a speaker system.

Therefore, it is considered that the speaker box to which the speaker is attached is modified in various ways to enhance the bass reproduction capability.

Figure 2 shows the box BX with the speaker unit SP attached.
The acoustic duct AD is provided on the front side of the box, and the acoustic duct AD guides the vibration waves in the bass range emitted from the back side of the speaker unit SP to the front side of the box BX to enhance the bass.

Further, in FIG. 3, a passive radiator PR is arranged on the front side of the box BX to which the speaker unit SP is attached, and the resonance frequency of this passive radiator PR (also called a drone cone) is set to a substantially bass reproduction frequency. This is intended to improve the bass reproduction capability.

[Problems to be solved by the invention]

However, the speaker system as described above,
Since it is necessary to provide the acoustic duct AD and the passive radiator PR as the acoustic elements for enhancing the bass in the speaker box BX, there is a problem that the speaker system becomes large. Further, if the bass reproduction capability of the speaker unit itself is poor, in order to enhance the bass output, it is necessary to increase the size of the speaker system, which inevitably leads to an increase in cost.

[Means for solving the problem]

The present invention has been made in view of the above problems, and for example, a passive radiator is arranged at a predetermined distance on the back surface of a diaphragm of a speaker provided in a sealed speaker box. The vibration of the passive radiator is emitted to the outside of the speaker box.

[Action]

Since the passive radiator is arranged behind the diaphragm of the speaker so as to be swingable, it is not necessary to attach an acoustic element for enhancing bass to the wall surface of the speaker box, and the speaker system can be downsized.

Since the vibration of the passive radiator is emitted to the outside through the opening of the ventilation ring supporting the diaphragm or the side wall of the speaker box, the resonance frequency of the passive radiator is adjusted to the appropriate acoustic impedance for the bass reproduction frequency. By setting so that the bass reproduction capability can be increased.

〔Example〕

FIG. 1 is a sectional view showing the structure of a speaker showing an embodiment of the present invention, in which 1 is a speaker frame, 2 is a speaker diaphragm (hereinafter referred to as a cone), and 3 is the cone 2 driven. The bobbin 3 is fixed to the frame 1 by a damper 4 so as to be swingable. A voice coil 5 is wound around the bobbin 3.

The bobbin 3 around which the voice coil 5 is wound is hung in the gap between the plate 8 and the center pole 9 which are magnetized by the donut-shaped magnet 7 arranged on the yoke 6, and moves as is well known. It constitutes an electric speaker.

Reference numeral 10 denotes a passive radiator added to the speaker of the present invention. One end of this passive radiator 10 is attached to the outer periphery of the frame 1 via a soft edge 10A, and the other end also projects from the frame 1. Glued to the portion 1B via the soft edge 10A.

Reference numeral 11 denotes a vent ring arranged on the outer peripheral side of the cone 2, and the vent ring 11 has a plurality of openings radially.
11A is formed.

In addition, 1A indicates an opening opened around the frame 1, 9A indicates a communication hole which opens the center of the center pole 9, and 12 indicates a speaker box which supports the speaker of the present invention. Shows some.

As described above, in the speaker of the present invention, the passive radiator 10 is provided behind the cone 2 via the soft edge 10A,
Since it is swingably attached, when the speaker is driven and the cone 2 vibrates, the passive radiator 10 also vibrates due to its back pressure. When the acoustic impedance (resonance frequency) of the passive radiator 10 is set to an appropriate value (lower than the bass resonance frequency of the speaker), when the cone 2 vibrates in the low tone, the vibration of the passive radiator 10 also becomes remarkable and the acoustic The waves are effectively emitted from the opening 11A of the ventilation hole ring 11, and the bass reproduction capability of the speaker can be enhanced.

This is because the passive radiator 10 exhibits the same function as the function of the passive radiator PR shown in FIG. 3 described above.

As described above, the speaker of the present invention does not require the passive radiator to be provided on the wall surface of the speaker box as shown in FIG. 3 shown as a conventional example, and thus has an excellent effect that the speaker system can be downsized.

As the passive radiator 10, for example, it is preferable that a lightweight resin is formed in a cone shape and is locked with the soft edge 10A to have a high compliance structure as much as possible.

Further, the opening 12A may be provided in the side wall of the speaker box 12 instead of the opening 11A of the ventilation hole ring.

〔The invention's effect〕

As described above, in the speaker of the present invention, the passive radiator is arranged on the rear surface of the speaker cone by a predetermined distance, and the acoustic wave generated by the vibration of the passive radiator is provided in the vent hole provided on the outer periphery of the cone. Since it is configured to emit to the outside from the opening of the ring or the opening formed in the side wall of the speaker box, the reproduction output in the bass range of the speaker can be effectively guided to the front side of the box, and the small size. Even when the speaker box is used, the bass reproduction capability can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a speaker showing an embodiment of the present invention, and FIGS. 2 and 3 are explanatory views showing a side surface of a conventional speaker system. In the figure, 1 is a speaker frame, 2 is a diaphragm (cone), 3 is a bobbin, 4 is a damper, 5 is a voice coil,
6 is a yoke, 7 is a magnet, 10 is a passive radiator, and 11 is a vent ring.

Claims (2)

(57) [Claims] 1. A passive radiator, which is supported by a soft edge at a predetermined distance from the diaphragm, is provided behind the diaphragm of the speaker, and the vibration of the passive radiator is provided around the outside of the speaker. A speaker characterized in that it is configured so as to be emitted to the front side of the speaker box from the opening of the vent hole ring. 2. The speaker according to claim 1, wherein the vibration of the passive radiator is emitted from the side wall of the speaker box to which the speaker is attached to the external space.