JPS5919678B2 - speaker device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker device configured by installing speakers on two sides of a sealed box and incorporating a passive radiator into a partition plate provided inside the box. The aim is to increase the sound pressure level in the bass range without reducing the sound pressure level in the mid-to-high range.

A conventional speaker device consists of a speaker 2 attached to the front of a sealed box 1, as shown in Figure 1, and an appropriate mass is attached to a diaphragm or voice coil to increase the sound pressure level in the bass range. It was added to vibration system parts such as.

However, in such a speaker device, as shown in Figure 2, compared to the sound pressure frequency characteristics before the addition of the mass shown by the solid line, the sound pressure frequency custom-made after adding the mass shown by the broken line has a lower sound pressure level in the bass range. Although the sound pressure level increased, the sound pressure level in the mid-to-high frequency range decreased.

The present invention reduces the sound pressure level in the mid-to-high frequency range,
The present invention aims to provide a speaker device that can measure the rise in sound pressure level in the bass range.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 7.

First, in FIG. 3, reference numeral 3 denotes a box with a closed structure made of wood, synthetic resin, metal, etc., and a partition plate 4 is provided inside this box 3.

A speaker 9 consisting of a magnetic circuit 5, a frame 6, a diaphragm 7, a voice coil 8, etc. is built into the front of the box 3, and a passive radiator 12 consisting of an edge 10 and a diaphragm 11 is installed in the partition plate 4. Built-in.

FIG. 4 shows an equivalent circuit of the mechanical system of the speaker device having this configuration.

In FIG. 4, F is the force applied to the speaker 9, m□ is the mass of the vibration system of the speaker 9, Co is the compliance of the vibration system of the speaker 9, CA is the compliance due to the volume behind the speaker 9, and m is the passive radiator 12. The mass of the vibration system of the passive radiator 12, C is the compliance of the vibration system of the passive radiator 12, and CA2 is the mass of the vibration system of the passive radiator 12.
Compliance is due to the volume behind.

With such a configuration, its operating principle is that when the force F is at a low frequency, the compliance CA of the volume behind the speaker 9
If □ is small and CA1 can be ignored at low frequencies, the equivalent circuit becomes as shown in FIG. 5, and the mass of the vibration system is considered to be 1710 + m.

Furthermore, when the force F becomes medium to high frequency and the compliance CA1 of the volume behind the speaker 9 cannot be ignored, the equivalent circuit becomes as shown in Fig. 6, and the mass of the vibration system is m□
Only.

Based on such an operating principle, if the compliance CA1 of the rear volume of the speaker 9 and the mass m of the vibration system of the passive radiator 12 are determined appropriately, a speaker without any additional vibration system mass can be obtained, as shown by the solid line in FIG. Compared to a custom-made sound pressure frequency speaker device that is simply built into a box (indicated by the broken line), the sound pressure level increases in the bass range without reducing the sound pressure level in the mid-to-high range. be able to.

In the above embodiment, only the passive radiator 12 consisting of the edge 10 and the diaphragm 11 has been described, but it has the same configuration as the speaker 9 and does not apply an input signal to the voice coil 8. Good too.

Since the speaker device of the present invention is configured as described above,
It is possible to increase the sound pressure level in the bass range without reducing the sound pressure level in the mid-to-high range, and the sound pressure level can be made high over the entire 4q beak, and the playback band can be particularly low. It has industrial value because it can widen the sound range and can produce remarkable effects when used in small speaker devices that tend to lack bass.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional speaker device, Fig. 2 is a sound pressure frequency characteristic diagram of the device, Fig. 3 is a sectional view showing an embodiment of the speaker device of the present invention, and Fig. 4 is a sectional view of the same machine. 5 and 6 are equivalent circuit diagrams of the system during the same operation, and FIG. 7 is a sound pressure frequency characteristic diagram of the device. 3... Box, 4... Partition plate, 5... Magnetic circuit, 6... Frame, 7... Vibration plate, 8... Voice coil, 9... Speaker, 10... Etsuji, 11.
...Diaphragm, 12...Passive radiator.

Claims (1)

[Claims] 1. A speaker device configured by incorporating a speaker consisting of a magnetic circuit, a diaphragm, and a voice coil into a box with a sealed structure, in which a partition plate is provided inside the box, and a passive radiator is incorporated into the partition plate. A speaker device featuring: