JPS5816317Y2 - Multiple speakers - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a composite speaker that integrally combines an electrodynamic speaker and a piezoelectric speaker.

Conventional composite speakers use mechanical 2 diaphragms, which have two diaphragms of different sizes attached to one voice coil bobbin.
Some had a structure called "Way", and others had a structure in which multiple independent speakers were installed in one speaker unit, but in the former, due to their structure, it was difficult to obtain flat characteristics over a wide frequency range. was extremely difficult.

In addition, in the latter case, not only does the structure become complicated and the cost is increased due to the need to combine two speakers compactly, but also one speaker blocks a part of the front opening of the other speaker. Because of its structure, it had drawbacks such as sacrifices in terms of acoustic characteristics.

In order to improve the above-mentioned problems, the present invention skillfully combines an electrodynamic speaker and a piezoelectric speaker.
The object of the present invention is to provide a composite type speaker that has a simple structure and can obtain good characteristics over a wide frequency range.

The present invention will be described in detail below using actual cases.

In Figure 1, 1 is a cone-shaped diaphragm for middle and low frequencies.
The center opening 1a of this diaphragm 1 is not opened like a general-purpose diaphragm plate, but is completely closed by a gap 2.

However, as shown in Fig. 2, even if the cap 2a that is present when the vibrator is assembled is used, or as shown in Fig. 3, a separate cap 2b made of paper, resin, etc. is used. It may be occluded.

Note that other closing means will be described later.

3 is a voice coil bobbin attached to the neck of the cone-shaped diaphragm 1, 4 is a magnetic circuit, 5 is a frame, 6a
, 6b are digit terminals installed in the frame 5.

7 is a piezoelectric type diaphragm, and this diaphragm I is composed of a flexible polymer film, such as polyvinylidene fluoride, and electrodes formed on both sides of the film by vapor deposition or the like.

As shown in FIG. 2, this piezoelectric diaphragm γ is connected to the cone-shaped diaphragm 1 by fixing two ring electrodes 7a and 7b on the outer periphery of both sides and electrically conducting with the above electrodes. Ru.

8a and 8b are the ring electrodes 7a and γb and the terminal 6
This is a lead wire that connects a and 6b.

Reference numeral 9 represents an elastic material, and this elastic material 9 is filled in the neck portion of the cone-shaped diaphragm 1 and brought into contact with the back surface of the piezoelectric diaphragm 7 to apply tension and elastic force to the piezoelectric diaphragm 7. Granted.

This elastic material 9 includes urethane, cotton, glass wool,
Compressed air or the like may be used.

Moreover, as mentioned above, the center opening 1a of the cone-shaped diaphragm 1
However, in the case of urethane, cotton, etc., which are tangible materials other than compressed air among the above-mentioned elastic materials 9, the center opening 1a is closed by solidifying the rear part thereof, that is, the part located at the center opening 1a. By closing the center opening 1a in this way, the volume of the inner chamber filled with the elastic substance 9 becomes constant.

FIG. 4 shows another embodiment of the present invention, in which the piezoelectric diaphragm 7 is attached to the open end of the voice coil bobbin 3, that is, the center opening 1a of the cone-shaped diaphragm 1. Supplementary numbers shown in the figures through FIG. 3 indicate the same parts.

Therefore, in order to drive the speaker configured as described above, a signal may be applied to the voice coil and the piezoelectric diaphragm 7.

Note that the surface of the piezoelectric diaphragm 7 may be subjected to surface treatment such as coating for surface protection.

Since the present invention is constructed in an upwardly sloping manner, the structure is not only extremely simple compared to conventional composite speakers, but also the conflict can be achieved in the same way as the conventional electrodynamic coke 1-force. .

Further, by compensating for the output attenuation in high frequencies caused by the cone-shaped diaphragm 1 with the piezoelectric diaphragm 7, complete full-range reproduction can be achieved.

Furthermore, the cross-range portion of the same root moving plate 1 has a high sound pressure due to the overlap of the vibrations of the cone-shaped diaphragm 1.

Furthermore, the piezoelectric diaphragm I can also function as a center cap.

[Brief explanation of the drawing]

Figure 1 is an overall schematic diagram of the composite speaker according to the present invention.
FIG. 2 is an enlarged view of the same main part, and FIGS. 3 and 4 are enlarged views of main parts of other embodiments. 1... Cone-shaped diaphragm, 1a... Center opening, 2... Cap, 3... Voice coil bobbin, 4... Magnetic circuit. ,7...
...Piezoelectric diaphragm, 9...Elastic substance.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ A piezoelectric diaphragm is stretched over the open end of a cone-shaped diaphragm or a voice coil bobbin attached to the neck of the diaphragm, and tension and elastic forces are applied to the piezoelectric diaphragm. A composite type speaker in which an elastic material is filled on the center opening side of a cone-shaped diaphragm so as to give the same, and the center opening of the cone-shaped diaphragm is closed at the rear of the elastic material. 2. The composite speaker according to claim 1, wherein the center opening of the cone-shaped diaphragm is closed by solidifying the rear part of the elastic material. 3. The composite speaker according to claim 1, wherein the center opening of the cone-shaped diaphragm is closed by a cap.