JP4126870B2 - Speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker used in various mobile communication devices.
[0002]
[Prior art]
Along with the recent miniaturization of mobile communication devices, it is desired to further reduce the size of the mobile communication speakers used therein.
[0003]
Here, a conventional mobile communication speaker will be described with reference to FIGS.
[0004]
4 (a) is a rear front view of a conventional speaker for mobile communication, FIG. 4 (b) is a half side sectional view, FIG. 4 (c) is the front view, and FIG. 5 is an exploded perspective view. It is.
[0005]
According to the figure, reference numeral 1 denotes a circular diaphragm that generates air vibrations, and the outer periphery of the diaphragm 1 is held by a frame 2 having a plurality of first sound holes 2a on the outer periphery by an adhesive. ing.
[0006]
One end portion of the voice coil 3 is fixed to the central portion of the diaphragm 1, and both ends of the voice coil 3 are electrically connected to a terminal portion 4 provided below the periphery of the frame 2.
[0007]
The terminal unit 4 is also connected to an audio output terminal (not shown) of the audio equipment.
[0008]
A magnetic circuit 8 including a magnet 5, a top plate 6, and a yoke 7 is integrally provided in the central hole portion of the frame 2 by insert molding when the frame 2 is molded, and the vibration is placed in the gap of the magnetic circuit 8. The other end side of the voice coil 3 fixed to the plate 1 is fitted.
[0009]
An audio signal output from the audio output terminal of the acoustic device is input to the voice coil 3 via the terminal unit 4, and the voice coil 3 is driven to vibrate the diaphragm 1 and emit sound waves. is there.
[0010]
Reference numeral 9 denotes a protector, which plays a role for protecting the diaphragm 1.
[0011]
Further, the protector 9 is provided with a second sound hole 9 a that is line-symmetrical or point-symmetric with respect to the central portion viewed from the plane direction, and the second sound hole 9 a is a sound wave emitted from the diaphragm 1. Is radiated outward.
[0012]
[Problems to be solved by the invention]
However, in the conventional speaker, as the size of the speaker progresses, the ratio of the terminal portion 4 to the entire speaker increases, and accordingly, the first sound hole 2a provided in the frame 2 is biased (the terminal portion 4 has the first sound hole 1a). The sound hole 2a is not provided), and there is no choice but to disproportionately arrange the air flow into the speaker due to the vibration of the diaphragm 1 when the speaker is driven. There is a problem that abnormal sound generation of the speaker occurs.
[0013]
The present invention solves the above-described problems, and provides a speaker having excellent sound quality even if the speaker is small and the arrangement of sound holes in the frame portion is unbalanced.
[0014]
[Means for Solving the Problems]
According to the first aspect of the present invention, the plurality of second sound holes of the protector attached to the frame of the speaker are arranged so as to be biased toward the terminal portion side of the frame, and enter from the protector side. Makes the air non-uniform, balances with the non-uniform air entering from the frame side, corrects the vibration of the diaphragm to a vertical motion with suppressed distortion, and reduces phenomena that cause abnormal noise such as rolling phenomenon It is intended.
[0015]
The invention according to claim 2 of the present invention is such that the diameters of the plurality of second sound holes provided in the protector are different from each other by two or more types, and the sound holes having a plurality of diameters are used. Therefore, it becomes possible to adjust the inflow amount of air more finely and further improve the sound quality of the speaker.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0017]
In the description, the same parts as those in the prior art are given the same numbers, and the description is omitted.
[0018]
(Embodiment 1)
1 (a) is a rear view of the speaker of the present invention, FIG. 1 (b) is a half sectional view thereof, FIG. 1 (c) is a front view thereof, and FIG. 2 (a) is a sound pressure characteristic at the same frequency. FIG. 2 (b) is a distortion characteristic diagram and mainly claims 1 of the claims.
[0019]
Only the differences from the prior art will be described with reference to FIG. 10. Reference numeral 10 denotes a protector attached to the frame 2 by adhesion, and reference numeral 10a denotes a plurality of second sound holes provided in the protector 10, which are provided below the frame 2. It arrange | positions so that it may be biased to the downward side of the protector 10 relatively so that the terminal part 4 currently provided may be opposed.
[0020]
FIG. 2A shows a comparison of frequency sound pressure characteristics between the speaker of the first embodiment and a conventional speaker, and FIG. 2B shows the same distortion characteristics. Although the speaker of the form 1 is shown as a and the conventional one is shown as b, as is clear from this characteristic diagram, no extreme difference was observed in the frequency sound pressure characteristic, but the distortion characteristic of the present embodiment It was confirmed that the speaker No. 1 was superior.
[0021]
This is because the protector 10 is biased toward the terminal portion 4 side of the protector 10 and the air that enters the diaphragm 1 non-uniformly from the plurality of first sound holes 2a at the location excluding the terminal portion 4 from the frame 2 side. This is because the air that enters the diaphragm 1 from the provided second sound holes 10a non-uniformly harmonizes and suppresses the occurrence of distortion of the diaphragm 1 and vibrates.
[0022]
(Embodiment 2)
The second embodiment of the present invention will be described mainly with reference to claim 2 in FIGS. 3A, 3B, and 3C.
[0023]
3A is a rear view of the speaker according to Embodiment 2 of the present invention, FIG. 3B is a half sectional view thereof, and FIG. 3C is a front view thereof. Only differences from the speaker of the first embodiment shown in FIG. 1 will be described with reference to FIG. 1. Reference numeral 11 denotes a protector, and the second sound hole 11a is biased toward the terminal portion 4 as in the sound hole 10a of the first embodiment. The second sound hole 11a is provided with sound holes having three types of hole diameters.
[0024]
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 finely adjusted in a well-balanced manner, and the sound quality of the speaker can be further improved. It is something that can be done.
[0025]
In the above-described embodiment, the second sound holes 10a and 11a are all provided on the opposite side of the terminal portion 4 below the center. However, as apparent from the above description, the frame 2 The unevenness of the balance of the inflow of air from the side is balanced by increasing the amount of inflow of air in the portion facing the terminal portion 4 of the protector 10 or 11 more than other portions. Without being limited thereto, a sound hole may be provided on the upper side from the center as long as the inflow amount of air is small, thereby enabling fine balance adjustment.
[0026]
【The invention's effect】
As described above, the speaker of the present invention balances the inflow of air flowing in through the protector by adjusting the positions of the plurality of second sound holes of the protector and the air entering nonuniformly from the frame side. In this way, 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 cross-sectional view thereof, and FIG. 2C is a front view thereof; FIG. Fig. 3 (a) Rear view of the second embodiment (b) Same half side sectional view (c) Same front view [Fig. 4] (a) Rear view of a conventional speaker (b) Same half Side sectional view (c) Front view [Fig. 5] Exploded perspective view [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)

A frame provided with at least a terminal part, a magnetic circuit mounted in a central hole part of the frame, a plurality of first sound holes provided on a peripheral edge of the magnetic circuit of the frame excluding the terminal part , A diaphragm having an outer periphery coupled with the other end of a voice coil having one end fitted in a magnetic gap of a magnetic circuit, and a plurality of second sounds mounted on the frame so as to cover the diaphragm A speaker configured with a protector provided with a hole, wherein the plurality of second sound holes are arranged so as to be biased toward the terminal side of the protector, thereby providing a frame side accompanying vibration of the diaphragm A loudspeaker that balances the air coming in unevenly .   The speaker according to claim 1, wherein the protector is provided with a plurality of second sound holes each having a diameter different from each other by two or more.

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