JPS5811114Y2 - Full-drive speaker device - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a full-plane drive type speaker device.It forms two conductors for inputting low-frequency signals and high-frequency signals divided into a single diaphragm, and expands the reproduction band. The purpose is to measure the

An example of a full-plane drive type speaker will be described with reference to FIG. A diaphragm 6 having a coiled conductor 6a formed on at least one surface thereof is arranged parallel to the magnetic flux within the magnetic gap 5.

A driving force is obtained by passing an audio current through the coiled conductor 6a, causing the diaphragm 6 to vibrate and emit sound waves into the atmosphere.

In order to improve the low-frequency reproduction ability of such speakers, it is necessary to increase the area of the diaphragm, but on the other hand, to improve the high-frequency reproduction ability, it is necessary to reduce the vibration area and reduce the effective mass. , both contradict each other.

Therefore, it has been usual for speakers of this type to be designed by sacrificing one of them at the design stage.

In order to solve these drawbacks, a full-plane drive speaker was devised in which a single diaphragm was divided into a high-frequency reproduction section and a low-frequency reproduction section, each with an independent coil-shaped conductor (Japanese Patent Application Laid-Open No. 1983-1992). -88015), but since a single diaphragm is divided into a high-frequency reproducing section and a low-frequency reproducing section, the low-frequency reproducing section has a drawback that a sufficient vibration area cannot be obtained.

This device has a coiled conductor for low-frequency signal input that has a portion disposed throughout the width of the magnetic gap on one side of the diaphragm, and a coiled conductor for inputting low-frequency signals that has a portion disposed entirely across the width of the magnetic gap on the other side of the diaphragm. This is a full-plane drive type speaker device that prevents a reduction in the area of the diaphragm during bass reproduction by providing coil-shaped conductors for high-frequency signal input, each having a portion for inputting a high-frequency signal, and the embodiments shown in FIGS. 2 and 3 below. will be explained in more detail.

In FIGS. 2 and 3, reference numeral 31a denotes a diaphragm substrate, which is made of a polymer film such as polyester or polyimide.

Two independent coil-shaped conductors 31 b and 31 c are formed on both sides of the diaphragm substrate 31 a by means of etching, vacuum deposition, or the like.

The conductor 31b formed on one side is for low frequency signal input,
The conductor 31C formed on the other side is for high frequency signal input, and is arranged only in the center of the magnetic gap. has.

The diaphragm has a conductor 31b of the diaphragm 31 within the magnetic gap 5 formed by the center pole 2 and the front plate 3.
, 31C (in the longitudinal direction of the coil in the figure) is arranged so that it is parallel to the magnetic flux, and the output end of a splitting filter (not shown) is arranged at the end of each conductor 31b, 31C (in the longitudinal direction of the coil in the figure). It is connected.

According to the above configuration, the audio signal is divided into a low frequency signal and a high frequency signal by the dividing filter and input to the respective conductors 31b and 31C.

When a low-frequency signal is input, a driving force is generated in the conductor 31b, so that the vibrating section vibrates over almost the entire surface, improving the low-frequency reproduction ability.

In addition, when a high frequency signal is input, a driving force is generated in the conductor 31C, so only the approximate center of the vibrating part vibrates, and the vibration area (
Since the effective mass) is small, the high frequency reproduction ability can be improved.

As described above, this invention has a low-frequency signal input conductor formed on one side of the drive plate base 31b over almost the entire surface of the vibrating section, and a high-frequency signal input conductor formed on the back surface almost at the center of the vibrating section. It operates as a so-called two-way speaker that inputs the divided low-frequency and high-frequency signals through a dividing filter, and can expand the reproduction band.

Furthermore, unlike conventional speakers, the bass and treble range vibrating parts are not separated, so there are advantages such as a sufficient vibration area for low range signals.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a conventional fully-driven speaker, and Fig. 2 is a partially cutaway perspective view of the fully-driven speaker of this invention.
FIG. 3 is an enlarged perspective view of the same. 31 b and 32 C are conductors, respectively, and 31 is a diaphragm.

Claims (1)

[Scope of utility model registration request] A magnetic circuit having a magnetic air gap formed by a plate 3 and a center pole 2, and a single diaphragm 31 on which a coiled conductor is formed, and at least a part of the coiled conductor is arranged in the magnetic air. In the full-plane drive type speaker configured so that the coiled conductors are separated from each other, a low-frequency signal input conductor 31b and a high-frequency signal input conductor 3 are separated.
1C, the low frequency signal input conductor 31b is formed entirely on one surface of the diaphragm 31 over the magnetic gap width, while the high frequency signal input conductor 31b
C is formed on the other surface of the diaphragm 31 only in a portion located at the center of the magnetic gap, and furthermore, each of the conductors 31 b
, 31 C. A full-plane drive type speaker device characterized in that a low-frequency signal and a high-frequency signal separated by a dividing filter are respectively input to the C. , 31C.