JPS6219026Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a double-sided drive speaker, which sends in-phase superimposed sound to the front of the speaker housing using a front diaphragm and a rear diaphragm connected by a reversing lever, increasing the low-frequency reproduction ability. It relates to a double-sided drive speaker.

Unlike sealed speakers, bass reflex and drone cone speakers make use of the sound pressure inside the speaker housing, which can increase the overall sound pressure. In particular, in the case of the drone cone type, unlike the bass reflex type which uses resonance only at a specific frequency, it is effective within the range where the diaphragm can move as a piston, so its effect extends over a wide range of frequencies.

However, drone cone type speakers,
This method enhances the low frequency range by lowering the resonant frequency of the drone cone, but it is extremely difficult to set the mass of the drone cone itself, and it is necessary to adjust the drone cone individually depending on the size of the speaker housing and other conditions. However, it had disadvantages such as a lack of versatility.

The present invention eliminates the above-mentioned drawbacks, and by connecting the diaphragms provided on the front and back sides of the speaker housing to each other using a reversing lever, and superimposing the sound obtained from both sides of the speaker housing in the same phase, low-frequency sound can be achieved. An object of the present invention is to provide a double-sided drive speaker that can effectively reproduce the sound.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an embodiment of a double-sided drive speaker according to the present invention, FIGS.
FIGS. 4A and 4B are a front view and a side view of the rear bumpy case, respectively, and FIGS. 4A and 4B are longitudinal sectional side views of the speaker housing showing the operation of the speaker, respectively.

In the figure, a double-sided drive speaker 1 is a speaker housing 1.
A front diaphragm 2 is attached to the upper front half of the speaker housing 1a, and a back diaphragm 3 is attached to the lower half of the rear panel so that they can vibrate back and forth, and both diaphragms 2 and 3 are pivoted at the center inside the speaker housing 1a. The configuration is such that they are connected using a lever 4. Therefore, when the front diaphragm 2 vibrates back and forth, the back diaphragm 3 vibrates back and forth with an opposite phase. Therefore, elongated holes 5 are provided on both sides of the speaker housing 1a so that the air inside the speaker housing 1a can freely flow in and out of the speaker housing 1a.

A back bump-full case 7 is attached to the back of the speaker housing 1a via a rubber plate 6 for preventing standing waves, and the sound sent out by the back diaphragm 3 is transmitted through the air hole 7a on the side of the bump-full case 7. The structure is such that it can wrap around the front side of the speaker housing 1a.

Here, the sound that passes through the inside of the double case 7 and wraps around to the front side of the speaker housing 1a is the sound that has been reflected once by the wall etc. behind the double case 7, so the sound produced by the rear diaphragm 3 is are in opposite phase,
The sound from the front diaphragm 2 is in the same phase.
Therefore, in front of the speaker 1, the front diaphragm 2
The sound created by the rear diaphragm 3 and reflected and made to be in phase is superimposed on the sound created by the rear diaphragm 3. In other words, these sounds do not interfere with each other, but amplify each other's strengths by overlapping peaks and valleys.

Therefore, the sound pressure obtained is approximately twice that of the case where the front diaphragm 2 is used alone, and unlike conventional closed-type speakers, there is no bass canceling phenomenon caused by sound going around from the back of the speaker housing. , the low frequency reproduction ability is large, and even compared to closed speakers of the same class, it can reproduce sufficiently low frequencies (50 to 100Hz), as shown by the solid line in the frequency characteristic diagram shown in Figure 5. I see that it is possible. In the figure, the dotted line represents the frequency characteristics of other conventional speakers.

In the above embodiment, the lower front half and the upper half of the rear surface of the speaker housing 1a are closed, but as in the double-sided drive speaker 11 shown in FIGS. Vibration plates 12 and 13 are provided throughout the whole, and these vibration plates 12 and 13
It is also possible to have a configuration in which the two are connected by four reversing levers 14. In this case, since the areas of the diaphragms 12 and 13 are large, the resulting sound pressure is also large.

Note that the air hole 17a on the side of the buff-full case 17 on the back side of the speaker housing 11a may be formed of a plurality of small holes as shown in FIG. 8B.

As explained above, according to the double-sided drive speaker of the present invention, the front diaphragm provided on the front side of the speaker housing and the back diaphragm provided on the back side are connected to each other by a reversing lever, and both diaphragms are reversed from each other. By driving in phase, the sound from the rear diaphragm, which is reflected behind the speaker housing and whose phase is reversed, is superimposed on the sound from the front diaphragm, so the sound from the front diaphragm and the sound from the rear diaphragm are It prevents deterioration in the low range due to sound interference and enables reproduction at sufficiently low frequencies.Also, since the displacement transmission between the two diaphragms is performed mechanically, it is suitable for use with, for example, drone-cone speakers. There is no phase shift between the driving side and the driven side, which is seen in speakers with a single diaphragm. Therefore, it has excellent effects such as being able to obtain a sound pressure twice as high as that of a single diaphragm speaker without impairing the reproduction characteristics. play.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of a double-sided drive speaker according to the present invention, Figs. 2 A and B are longitudinal sectional front views and longitudinal sectional side views of the speaker housing, respectively, and Figs. 3 A and B.
are the front view and side view of the back full case, respectively.
4A and 4B are vertical side views of the speaker housing showing the operation of the speaker, FIG. 5 is a frequency characteristic diagram showing the reproduction characteristics of the double-sided drive speaker, and FIG. 6 is the double-sided drive speaker according to the present invention. FIGS. 7A and 7B are a front view and a side view of the speaker housing, respectively. FIGS. 8A and 8B are a front view and a side view of the back full case, respectively. Figure A,
B is a vertical side view of the speaker housing showing the operation of each speaker. 1, 11...Double-sided drive speaker, 1a, 11a
...Speaker housing, 2,12...Front diaphragm,
3, 13... Back diaphragm, 4, 14... Reversing lever.

Claims (1)

[Scope of utility model registration request] A front diaphragm that sends sound to the front of the speaker housing,
It consists of a rear diaphragm that is mechanically connected to the front diaphragm via a reversing lever and sends sound to the rear of the speaker housing, and by driving both diaphragms in opposite phases to each other, the speaker housing is A double-sided drive speaker in which the sound transmitted by the rear diaphragm reflected at the rear is superimposed in phase with the sound transmitted by the front diaphragm on the front side of the speaker housing.