JP2002165291A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact, high-quality speaker that is used for each mobile unit communication equipment kind and inhibits distortion and abnormal sounds. SOLUTION: In the loudspeaker, a second sound hole 10a of a protector 10 that is fitted to a frame 2 of the loudspeaker is provided, while being biased to the side of a terminal section 4 of the frame, air entering from the side of the protector 10 is made nonuniform, so that it is balanced with nonuniform air entering from the side of the frame 2; the vibration of a diaphragm 1 is corrected to up/down movement with inhibited distortion, and a rolling phenomenon or the like for causing abnormal sounds is reduced, thus achieving the high-quality loudspeaker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used for various mobile communication devices.

[0002]

2. Description of the Related Art With the recent miniaturization of mobile communication devices, there is a demand for further miniaturization of mobile communication speakers used therein.

Here, a conventional speaker for mobile communication will be described with reference to FIGS. 4 and 5. FIG.

FIG. 4 (a) is a front view of the back surface of a conventional speaker for mobile communication, FIG. 4 (b) is a half-side sectional view thereof, and FIG.
(C) is a front view of the same, and FIG. 5 is an exploded perspective view of the same.

Referring to FIG. 1, reference numeral 1 denotes a circular diaphragm for generating air vibration, and the outer peripheral portion of the diaphragm 1 has a plurality of first sound holes 2a provided on the outer periphery thereof with an adhesive. Is held in.

[0006] One end of a voice coil 3 is fixed to the center of the diaphragm 1, and both ends of the voice coil 3 are electrically connected to a terminal portion 4 provided below a peripheral edge of the frame 2.

The terminal unit 4 is also connected to a sound output terminal (not shown) of the audio equipment.

A magnetic circuit 8 composed of a magnet 5, a top plate 6, and a yoke 7 is integrally provided in the center hole of the frame 2 by insert molding when the frame 2 is formed. The other end of the voice coil 3 fixed to the diaphragm 1 is fitted into the diaphragm 1.

An audio signal output from an audio output terminal of the audio device is input to the voice coil 3 through a terminal unit 4, and the voice coil 3 is driven to vibrate the diaphragm 1 to emit a sound wave. Things.

Reference numeral 9 denotes a protector, which plays a role for protecting the diaphragm 1.

The protector 9 is provided with a second sound hole 9a which is line-symmetric or point-symmetric with respect to the center as viewed from the plane, and the second sound hole 9a is radiated from the diaphragm 1. The emitted sound waves are radiated outward.

[0012]

However, in the conventional loudspeaker, as the size of the loudspeaker is reduced, the ratio of the terminal portion 4 to the whole loudspeaker is increased, and the first sound hole 2a provided in the frame 2 is accordingly increased. It is inevitably imbalanced (the first sound hole 2a is not provided in the terminal portion 4), so that the inflow of air into the speaker due to the vibration of the diaphragm 1 when the speaker is driven is uniform. Therefore, there is a problem that rolling is caused and abnormal sound is generated from the speaker.

The present invention solves the above-mentioned problems, and provides a speaker having excellent sound quality even when the size of the speaker is small and the arrangement of sound holes in the frame portion is unbalanced.

[0014]

According to the first aspect of the present invention, the second sound hole of the protector mounted on the frame of the speaker is provided so as to be biased toward the terminal of the frame. The air entering from the protector side is made non-uniform, the balance with the non-uniform air entering from the frame side is balanced, and the vibration of the diaphragm is corrected to vertical movement with suppressed distortion, which causes abnormal noise such as rolling phenomenon This is intended to reduce the phenomenon.

According to a second aspect of the present invention, the plurality of second sound holes provided in the protector have different diameters by two or more types, respectively. By using this, finer adjustment of the inflow amount of air becomes possible, and the sound quality of the speaker is further improved.

[0016]

1 to 3 show an embodiment of the present invention.
This will be described below.

In the description, the same parts as those of the prior art are denoted by the same reference numerals, and the description will be omitted.

(Embodiment 1) FIG. 1A is a rear view of a speaker of the present invention, FIG.
FIG. 2C is a front view of the same, FIG. 2A is a sound pressure characteristic diagram of the same frequency, and FIG. 2B is a distortion characteristic diagram of the same frequency. .

Referring to FIG. 1, only the differences from the prior art will be described. Reference numeral 10 denotes a protector attached to the frame 2 by bonding, and reference numeral 10a denotes a plurality of second sound holes provided in the protector 10. The protector 1 is relatively opposed to the terminal portion 4 provided below.
It is arranged so as to be biased to the lower side of 0.

FIG. 2A compares the frequency and sound pressure characteristics of the loudspeaker of the first embodiment and the conventional loudspeaker, and FIG. 2B shows the same distortion characteristics. The speaker according to the first embodiment is indicated by a, and the conventional speaker is indicated by b. As is clear from this characteristic diagram, no extreme difference was observed in the frequency sound pressure characteristic, but the distortion characteristic It was confirmed that the speaker of Embodiment 1 was superior.

This is because the terminal unit 4
Air from the plurality of first sound holes 2a except for the first sound hole 2a and the second sound hole 10a provided in the protector 10 so as to be unevenly biased toward the terminal portion 4 side of the protector 10 side. It is considered that the air that uniformly enters the diaphragm 1 harmonizes with the diaphragm 1 and vibrates while suppressing the occurrence of distortion of the diaphragm 1.

(Embodiment 2) Embodiment 2 of the present invention will be described mainly with reference to FIGS. 3 (a), 3 (b) and 3 (c).

FIG. 3A is a rear view of the speaker according to the second embodiment of the present invention, FIG.
FIG. Only the differences from the speaker of the first embodiment shown in FIG. 1 will be described with reference to FIG. The second sound hole 11a is provided with sound holes having three kinds of hole diameters.

As described above, by using a plurality of second sound holes 11a having different hole diameters, the amount of air entering from the protector 11 side can be adjusted more finely and in a well-balanced manner. Can be achieved.

In each of the above embodiments, the second
The sound holes 10a and 11a have been described as being provided on the opposite side of the terminal portion 4 below the center. However, as is clear from the above description, the unevenness of the balance of the inflow of air from the frame 2 side is reduced. Since the amount of inflow of air in the portion of the protector 10 or 11 facing the terminal portion 4 is balanced by increasing the amount of inflow of air from the other portions, the amount of inflow of air is not limited to each of the embodiments. If it is small, a sound hole may be provided above the center, which enables fine balance adjustment.

[0026]

As described above, according to the speaker of the present invention, the position of the second sound hole of the protector is adjusted so that the air flowing in through the protector and the air entering unevenly from the frame side are not affected. By balancing, it is possible to provide a speaker that suppresses distortion in the diaphragm and improves sound quality.

[Brief description of the drawings]

1A is a rear view of a speaker according to a first embodiment of the present invention, FIG. 1B is a half-side sectional view of the speaker, and FIG.

FIG. 2 (a) Same frequency sound pressure characteristic diagram (b) Same distortion characteristic diagram

3A is a rear view of the second embodiment, FIG. 3B is a half-side sectional view of the same, and FIG.

4A is a rear view of a conventional speaker, FIG. 4B is a half sectional side view of the same speaker, and FIG.

FIG. 5 is an exploded perspective view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Frame 2a 1st sound hole 3 Voice coil 4 Terminal part 5 Magnet 6 Top plate 7 Yoke 8 Magnetic circuit 10, 11 Protector 10a, 11a 2nd sound hole

Claims (2)

[Claims] 1. A frame provided with at least a terminal portion, a magnetic circuit mounted on the frame, and a first sound hole eccentrically provided by the terminal portion provided on a peripheral edge of the magnetic circuit of the frame. And a diaphragm having an outer periphery coupled to the frame, the other end of which is coupled to the other end of the voice coil having one end fitted into the magnetic gap of the magnetic circuit, and a second diaphragm mounted on the frame to cover the diaphragm. A speaker comprising a protector provided with a sound hole, wherein the second sound hole is provided in the protector so as to be biased toward the terminal portion. 2. The loudspeaker according to claim 1, wherein a plurality of second sound holes each having two or more different diameters of the sound holes are provided in the protector.