JPH0847072A - Speaker - Google Patents

Abstract

PURPOSE:To prevent intrusion of foreign matter such as dust through a throughhole for air intake inexpensively by providing a filter section formed as a mesh to a position of a name plate opposite to the air intake throughhole. CONSTITUTION:A yoke 1 to which a center pole 1a is stood upright, a torus magnet 2 and a top plate 3 form a magnetic circuit whose magnetic gap G. A throughhole 1b is made open to the center pole 1a to let the air inside and the one outside of the speaker be made to communicate with each other. A filter section 14b with a fine mesh is provided to a middle of a nameplate 14 formed by punching a metallic thin plate made of aluminum or the like. When the nameplate 14 is adhered to a bottom of the yoke 1, the filter section 14b is designed to be opposite to the throughhole 1b of the yoke 1. Since the intrusion of foreign matter such as dust is prevented by the filter section 14b, it is not required to mount a dust-proof exclusive component such as a dust- proof net.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker, and in particular,
The present invention relates to a dustproof measure for preventing dust and the like from entering through a through hole that communicates air inside and outside a speaker.

[0002]

2. Description of the Related Art FIG. 4 is a vertical cross-sectional view of a generally known speaker.

The speaker illustrated in FIG. 1 has a yoke 1 in which a columnar center pole 1a is erected, an annular magnet 2 placed on the yoke 1 so as to surround the center pole 1a, and this magnet 2. A magnetic circuit is constituted by the top plate 3 placed on the above,
A voice coil 5 wound around a coil bobbin 4 is loosely inserted in a magnetic gap G formed between the outer peripheral surface of the center pole 1a and the inner peripheral surface of the top plate 3. An inner peripheral portion of a diaphragm 6 made of cone paper or the like is bonded to the coil bobbin 4, and an outer peripheral portion of the diaphragm 6 is supported by a frame 8 via a cone edge 7. Further, the inner peripheral portion of the damper 9 is bonded to the coil bobbin 4, and the inner peripheral portion of the diaphragm 6 and the coil bobbin 4 are supported by the frame 8 via the damper 9. A lead wire 10 led out from the voice coil 5 and drawn out to the side wall 8a of the frame 8 is connected to a terminal board 11, and a voice is connected via an external lead wire (not shown) connected to the terminal board 11. By supplying a voice signal current to the coil 5, the voice coil 5 is driven in the magnetic gap G by receiving an electromagnetic force, and the diaphragm 6 vibrates accordingly to emit a voice.

Reference numeral 12 in the drawing denotes a blind and dustproof center cap which is adhered to the diaphragm 6, and 13 is a dustproof net made of cloth or the like which is adhered to the top surface of the center pole 1a of the yoke 1. Reference numeral 14 is a name plate adhered to the bottom surface of the yoke 1 and displaying a manufacturer name, a product name, and the like.
Here, the dustproof net 13 has a through hole 1b formed in the center pole 1a for communicating air inside and outside.
This is to prevent foreign matter such as dust from flowing in through the. That is, if there is a large difference in atmospheric pressure between the inside and outside of the speaker, the vibration characteristics of the diaphragm 6 will be significantly deteriorated. Therefore, a through hole 1b is usually provided in the approximate center of the yoke 1 to let air in and out. However, if foreign matter flows in through the through hole 1b, the narrow magnetic gap G may be adversely affected. Therefore, the dustproof net 13 prevents such foreign matter from flowing in advance, thus improving reliability. Is increasing. An opening 14a for allowing air to flow in and out without closing the through hole 1b is provided at the center of the name plate 14.

[0005]

However, in the above-mentioned conventional speaker, the dustproof net 13 is bonded to the yoke 1 in order to prevent foreign matter such as dust from flowing in through the through hole 1b for air communication. Therefore, the number of parts and the number of assembling steps increase accordingly, which has been a factor of increasing the manufacturing cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a speaker which can prevent the inflow of foreign matter through the through hole for air communication at a low cost.

[0007]

The above-mentioned object of the present invention is to provide a magnetic circuit in which a yoke and a magnet are combined to provide a magnetic gap around the yoke, a voice coil arranged in the magnetic gap, and a voice coil. In a speaker that includes a diaphragm that is driven by a coil to vibrate and a nameplate that is attached to the bottom surface of the yoke, and that communicates air inside and outside through a through hole provided in the yoke, This is achieved by providing a filter portion formed into a mesh shape at a position facing the through hole.

[0008]

According to the above-mentioned solving means, since the filter portion of the nameplate prevents foreign matter from entering from the outside of the speaker toward the through hole of the yoke, it is not necessary to separately install a dust-proof component separately, and the number of components and the assembly are improved. Man-hours can be reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of a speaker according to the present invention, and FIG. 2 is a plan view of a nameplate which is a constituent element of the same embodiment, which corresponds to FIG. 4 used for explaining a conventional example. The parts are denoted by the same reference numerals.

As is apparent from FIGS. 1 and 2, this embodiment is
The center portion of the nameplate 14 bonded to the bottom surface of the yoke 1 is processed into a mesh shape, and the through hole 1b for air communication.
It is different from the conventional example shown in FIG. 4 in that a normal dustproof net for covering foreign matter and preventing foreign matter from entering is omitted.
The other configurations are the same as those of the conventional example.

That is, in FIG. 1, reference numeral 1 is a yoke in which a center pole 1a is erected, 2 is an annular magnet, 3 is a top plate, and these constitute a magnetic circuit having a magnetic gap G. 1a is a through hole 1 for communicating air inside and outside the speaker.
b has been opened. Reference numeral 4 is a coil bobbin, 5
Is a voice coil wound around the coil bobbin 4, 6 is a diaphragm made of cone paper, 7 is a cone edge, and 8 is a side wall 8.
a frame having a, 9 a damper, 10 a lead wire of the voice coil 5, 11 a terminal plate to which the lead wire 10 is connected, 12 a center cap,
Are loosely inserted in the magnetic gap G.

Then, as shown in FIGS. 1 and 2, a fine mesh shape is formed in the central portion of the name plate 14 formed by punching a thin metal plate such as aluminum for displaying the manufacturer name, product name, etc. A processed filter portion 14b is provided, and when the name plate 14 is adhered to the bottom surface of the yoke 1, the filter portion 14b is designed to face the through hole 1b of the yoke 1. The filter unit 14
b can be simultaneously formed by a pressing machine when punching the name plate 14 from a thin metal plate.

Now, the mesh-shaped filter portion 1 facing the through hole 1b of the yoke 1 in the central portion of the nameplate 14 as described above.
When the filter portion 1b is provided, foreign matter such as dust is prevented from entering from the outside of the speaker to the through hole 1b for air communication.
Since it can be prevented by 4b, it is not necessary to incorporate a dustproof exclusive component such as a dustproof net attached to the conventional product in order to improve reliability. As a result, the number of parts and the number of assembling steps can be reduced without deteriorating the reliability of the speaker, and since the filter portion 14b can be formed at the time of punching the name plate 14, the number of steps before assembling does not increase, thus significantly reducing the manufacturing cost. It becomes possible.

FIG. 3 is a main part explanatory view showing another embodiment of the speaker according to the present invention, in which parts corresponding to those in FIGS.

That is, in FIG. 3, the nameplate 1 is attached to the bottom surface of the yoke 1.
4 shows the state of aligning and attaching 4 to each other. In this embodiment, since the convex filter portion 14c to be fitted into the through hole 1b is provided in the central portion of the name plate 14, this filter portion 14c is If the yoke 1 is inserted into the through hole 1b from the bottom surface side, the nameplate 14 is automatically aligned with the bottom surface of the yoke 1 without complicated positioning work. Is improved.

Like the filter portion 14b, the convex filter portion 14c can be formed at the time of punching the nameplate 14, and the through hole 1b is formed from the outside of the speaker.
Performs a dustproof function to prevent foreign matter such as dust toward the outside. In addition, although the present embodiment exemplifies the bowl-shaped filter portion 14c having an outer diameter equal to or slightly smaller than the inner diameter of the through hole 1b, the convex portion to be fitted into the through hole 1b has a shape other than the bowl shape. Alternatively, the filter portion 14c may be formed only on a part of the convex portion.

Furthermore, in each of the above-mentioned embodiments, the nameplate 14 is made of metal, but the present invention can be applied to the case where the nameplate 14 is made of synthetic resin.

[0019]

As described above, according to the present invention,
The nameplate attached to the bottom surface of the yoke of the magnetic circuit is provided with a mesh-shaped filter part facing the through hole for air communication, and this filter part is a foreign substance such as dust that goes from the outside of the speaker to the through hole. Since it prevents the intrusion of dust, there is no need to separately install a dust-proof component like the conventional product,
There is an effect that the number of parts and the number of assembling steps can be reduced, and as a result, it is possible to provide a highly reliable speaker with dustproof measures at low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a speaker according to the present invention.

FIG. 2 is a plan view of the nameplate shown in FIG.

FIG. 3 is a main part explanatory view showing another embodiment of the speaker according to the present invention.

FIG. 4 is a vertical cross-sectional view of a conventionally generally known speaker.

[Explanation of symbols]

 1 yoke 1a center pole 1b through hole 2 magnet 5 voice coil 6 diaphragm 14 nameplate 14b, 14c filter part G magnetic gap

Claims (2)

[Claims] 1. A magnetic circuit in which a yoke and a magnet are combined to provide a magnetic gap around the yoke, a voice coil arranged in the magnetic gap, a diaphragm vibrated by being driven by the voice coil, In a speaker having a nameplate attached to the bottom surface of the yoke and communicating air inside and outside through a through hole provided in the yoke, a mesh shape is formed at a portion facing the through hole of the nameplate. A speaker provided with a processed filter portion. 2. The speaker according to claim 1, wherein the nameplate is provided with a convex portion to be fitted into the through hole, and the filter portion is provided on at least a part of the convex portion.