JPS60224396A - Speaker unit - Google Patents

Abstract

PURPOSE:To obtain a speaker unit capable of reducing the interference of sounds by disposing acoustic resistance paltes having plural holes on a front surface, rear surface or both surfaces of a diaphragm. CONSTITUTION:A front surface acoustic resistance plate 10 is fitted on a diaphragm 4 through a gasket 8. Plural small holes 20 and 21 are drilled on the resistance plate 10, and the diameter of the hole 20 at the center is larger than that of the hole 21. The total area of these holes is decided to be 20-30%. Plural holes 30 are drilled on a frame 5, and formed in a slender shape at same intervals along a periphery of a coil 2, thereby functioning as a rear surface acoustic resistance plate. By providing acoustic resistance plates before and after the diaphragm 4 in such a way, sounds in a low frequency can be escaped through holes formed around resistance plates 5 and 10, which is effective in canceling out of low frequency parts and makes turning-around smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a speaker unit, and more particularly to a speaker unit that generates sound by vibrating a diaphragm in accordance with a current flowing through a voice coil.

[Prior art]

Conventional speakers have difficulty reproducing low frequencies by themselves.

This is because the sound emitted from the front surface of the diaphragm and the sound emitted from the rear surface interfere with each other, reducing the sound radiation efficiency. In order to prevent this, various methods have been considered to reduce the interference between the front waves and the rear waves by using a baffle plate or a BOX.

〔the purpose〕

SUMMARY OF THE INVENTION Therefore, the present invention has been made in order to eliminate such conventional drawbacks, and an object thereof is to provide a speaker unit that can reduce sound interference.

In order to achieve this object, the present invention adopts a structure in which an acoustic resistance plate having a plurality of holes is disposed on the front or rear surface of the diaphragm, or on both front and rear surfaces.

〔Example〕

Hereinafter, the present invention will be described in detail according to embodiments shown in the drawings.

In FIG. 1, the reference numeral 1 indicates a center pole, and a voice coil 2 is disposed coaxially with this center pole within a gap between the center pole 1 and a yoke 6.

The voice coil 2 is fixed to a cylindrical portion 4a of the diaphragm 4, and a bolt 6, whose one end is supported by a frame 5, is fixed to the cylindrical portion 4a. The periphery of the diaphragm 4 is fixed to the frame 5 via a gasket 8, and the cylindrical portion 4a of the diaphragm is connected via a center gap 7.

Further, the front acoustic resistance plate 10 is attached to the diaphragm 4 with a gasket 8.
Mounted via.

As shown in FIG. 2, a plurality of small holes 20 and 21 are formed in the front acoustic resistance plate 10, and the diameter of the hole 20 at the center of the trench is larger than the diameter of the surrounding holes 21. It is formed. The total area of the holes is set at 20 to 30 inches.

The frame 5 also has a plurality of holes 3 as shown in FIG.
0 is set. These holes have an elongated shape and are formed at equal intervals along the circumference of the reed and coil 20. This frame 5
functions as a rear acoustic resistance plate.

In a speaker unit having such a configuration, acoustic resistance plates are provided before and after the diaphragm 4, so that low-frequency sounds can escape through holes formed in the front and rear acoustic resistance plates 5, 10. Therefore, it is possible to eliminate the cancellation of the low-pitched sound part, and to reduce the wrap-around effect, thereby reducing the sound distortion and improving the extension of the low-pitched sound. Moreover, the high-pitched sound part can be released through the central part 10a of the front acoustic resistance plate 10.

In the embodiment described above, both the front and rear acoustic resistance plates are preferably arranged as close as possible to the diaphragm 4;
Also, the hole 6o in the rear acoustic resistance plate is arranged as close as possible to the neck 5a.

The holes formed in each acoustic resistance plate may have various shapes, but are limited to the shapes shown. Further, the center portion 10a of the front acoustic resistance plate 1o may be completely cut out.

[Brief explanation of drawings]

FIG. 3 is a plan view of the rear acoustic resistance plate. 1...Center pole 2...Voice coil 6...
・Damper 7...Center gap 8...Gasket 10...Front acoustic resistance plate 20.21.30...
Hole patent applicant Wa〇-Toyo Electronics Co., Ltd.
Patent Attorney Takashi Kato Figure 1 B 12

Claims (1)

[Claims] vibrates the diaphragm according to the current flowing through the voice coil,
1. A speaker unit that generates sound, characterized in that an acoustic resistance plate having a plurality of holes is disposed on at least the front, rear, or both sides of a diaphragm.