JP3236921B2 - Two-way radiation speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker which is provided in various kinds of audio equipment and radiates sound in both front and rear directions with a magnetic circuit as a center, and which has low leakage magnetism.

[0002]

2. Description of the Related Art Conventionally, a speaker 30 of this type has a magnetic circuit 34 comprising a yoke 31, a top plate 32 and a magnet 35, as shown in FIG.
1 and a top plate 32, an annular magnetic gap 33 is formed, a frame 40 is mounted on the magnetic circuit 34, and a voice coil 36 connected to an external electric input.
Is supported by a vibration system formed of a damper 38, a diaphragm 39 and the like concentrically fixed to a voice coil bobbin 37 around which the voice coil 36 is wound so that the voice coil 36 is loosely supported by the magnetic gap 33. It is attached to the frame 40. 41 is a dust cap, 42 is a gasket for pressing the outer periphery of the diaphragm 39 against the frame 40.

[0003]

Therefore, in the conventional magnetic circuit 34 of the speaker 30 of this type, the magnetic leakage from the peripheral portion of the magnet 35 is large, and there is a possibility that the magnetic effect will be exerted on other peripheral devices. There was probably. Also, since there is only one set of magnetic gaps 33, only one set of vibration systems having a single diaphragm 39 can be attached, so that there is a problem that sound can be radiated only in one direction.

Therefore, in order to solve the problems of the conventional speaker 30, the present invention forms an annular magnetic gap 3 in which a ring-shaped magnet 5 is mounted, as shown in FIG. While extending the center pole 2 of the ordinary external magnet type magnetic circuit backward to form an extension 2a,
The outer edge of the top plate 6 is extended outward and extended, and is joined to the outer edge of the bowl-shaped outer yoke 4, between the center hole provided at the center of the yoke 4 and the extension 2 a of the center pole 2. The annular magnetic air gap 3a is formed in the ring magnet 5 so that the annular magnetic air gap 3,
By providing the configuration 3a, it is intended to provide a bidirectional radiating speaker 23 equipped with a magnetic circuit 15 which enables bidirectional acoustic radiation and minimizes leakage magnetism.

[0005]

The structure of the present invention for achieving the object will be described with reference to FIGS. 1 and 2 corresponding to the embodiment. In the magnetic circuit 15 in which the annular magnetic air gap 3 is formed, an extension end 2 a is formed by extending a lower end of a center pole 2 erected perpendicularly to the center of the inner plate 1 to the rear of the inner plate 1 and a top plate. The outer edge of the outer yoke 4 is extended outward and joined to the outer edge of the bowl-shaped outer yoke 4 between the center hole provided at the center of the outer yoke 4 and the extended end 2a of the center pole 2. The bidirectional radiating speaker 23 has a configuration in which the magnetic circuit 15 having the annular magnetic air gaps 3a formed therein and the annular magnetic air gaps 3 and 3a formed on both front and back surfaces of the ring-shaped magnet 5 is mounted.

[0006]

Therefore, the two-way radiating speaker 23 of the present invention is
With such a structure, the magnetic circuit 15
With the magnetic gaps 3, 3a as the centers, the diaphragms 9, 19,
Sound is radiated in both directions of the magnetic circuit 15 by mounting the outer periphery of the acoustic radiation vibration system in which the voice coils 7a, 17a, the bobbins 7, 17, the dampers 8, 18 and the like are assembled and joined concentrically. Can be.

As a result, on the axis of the speaker 23, the sound from the diaphragm 9 (19) of one of the acoustic radiation vibrating systems is transmitted in the front and back directions on the axis of the speaker 23 and the other diaphragm 19 (, 19).
9), the two diaphragms 9, 19 are mounted on a reflective cabinet capable of radiating in the same direction as the sound from (9).
Can be added to one another in one direction. Also,
In this case, the characteristics of the front and rear diaphragms 9 and 19 can be changed, for example, like a woofer and a tweeter, so that various characteristics can be provided by a single speaker. In addition, since the outer edge of the top plate 6 that is extended outward is joined to the outer edge of the bowl-shaped outer yoke 4, the outer edge of the ring-shaped magnet 5, that is, the inner plate 1 or the top plate 6. Since it is possible to shield the leakage magnetism that leaks from the joints or the like, it is possible to eliminate the possibility that other devices in the vicinity of the speaker 23 are adversely affected by the magnetic field.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and FIG. 2 are views showing one embodiment of the present invention, and FIG. 1 is a cross-sectional view of the speaker of the present invention. FIG. 2 is a sectional view of a magnetic circuit used for the speaker of the present invention. As shown in FIGS. 1 and 2, reference numeral 1 denotes a flat disk-shaped inner plate made of magnetically soft soft iron, and a center pole 2 is vertically provided at the center thereof. The center pole 2 is extended rearward of the inner plate 1 to form an extension 2a.

Then, a ring-shaped magnet 5 is concentrically mounted on the inner plate 1 and a top plate 6 is further mounted thereon, and a hole formed in the center of the top plate 6 is provided. An annular magnetic gap 3 is formed between the center pole 2 and the center pole 2. A center hole formed in the center of the bottom of the bowl-shaped yoke 4 by extending the outer edge of the top plate 6 outward and joining the outer edge of the bowl-shaped external yoke 4; An annular magnetic air gap 3a is formed between the second magnetic member 2 and the extension 2a.

Accordingly, the magnetic circuit 15 is a magnetic circuit having a structure in which the magnetic gaps 3 and 3a are provided before and after the ring magnet 5. Frames 10 and 20 are respectively attached to the front and rear surfaces of the magnetic circuit 15 having such a structure, and voice coils 7a and 17a connected to external electric inputs
Are concentrically fixed to voice coil bobbins 7, 17 around which the voice coils 7a, 17a are wound so as to be loosely supported in the magnetic gaps 3, 3a.
Attached to the frames 10 and 20 by an acoustic radiation vibration system formed of diaphragms 9 and 19 and the like. 1
1 and 21 are dust caps, 12 and 22 are diaphragms 9 and 1
9 is a gasket for pressing the outer periphery of the frame 9 against the frames 10 and 20.

As described above, the speaker 23 of the present invention is provided with the annular magnetic air gap 3,
With the configuration in which 3a is formed, it is possible to radiate sound in both directions before and after the magnetic circuit 15. The operation of the loudspeaker having the dual gap magnetic circuit of the present embodiment configured as described above will be described. Inputs from the same or independent signal sources are applied to the voice coils 7 and 17, and the diaphragms 9 and 19 can be driven independently.

The ability to operate these two sets of speakers has many advantages. Although the speaker has been described in which the outer shape of the center pole 2 is configured to have the same diameter in both the upper and lower portions, it is needless to say that the speakers may have different diameters. That is, if one is used as a speaker for radiating low-frequency sound and the other is used as a speaker for radiating high-frequency sound, HiFi is used as a two-way speaker.
Reproduction can be performed with extremely good sound quality in reproduction. Further, by installing different types of speakers, it is possible to reproduce various sound qualities by various sound effects. Although the embodiments that are considered to be representative of the present invention have been described above, the present invention is not necessarily limited to only the structures of the embodiments, and has the above-described configuration requirements according to the present invention, and
The present invention achieves the object of the present invention and can be appropriately modified and implemented within the range having the following effects.

[0013]

As is clear from the above description, in the speaker of the present invention, the mounted magnetic circuit has a very good use efficiency of a single ring-shaped magnet, and has a very small magnetic leakage. Therefore, two sets of speakers can be operated in both directions before and after one magnetic circuit,
It is an excellent speaker for HiFi playback. Also, 2
Compared to a case where the sets of speakers are separately assembled, the cost of parts materials and the number of steps can be reduced, and thus there is a remarkable effect that the cost can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a magnetic circuit of the speaker shown in FIG. 1;

FIG. 3 is a cross-sectional view of a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal plate 2 Center pole 2a Extension 3,3a Magnetic gap 4 External yoke 5 Ring-shaped magnet 6 Top plate 7,17 Voice coil bobbin 7a, 17a Voice coil 8,18 Damper 9,19 Vibration plate 10,20 Frame 11,21 Dust cap 12,22 Gasket 15 Magnetic circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-62298 (JP, A) JP-A 61-124183 (JP, U) JP-A 1-171169 (JP, U) Jiko 32-32 4929 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04R 9/06 G10K 11/26 H04R 9/00 H04R 9/02 102 G10K 11/28

Claims (1)

(57) [Claims] In a magnetic circuit in which a ring-shaped magnet is mounted and an annular magnetic gap is formed, a center pole is set upright at a center of an inner plate of the magnetic circuit.
Of the top plate 6 and the outer edge of the top plate 6 is extended outward and joined to the outer edge of the bowl-shaped outer yoke 4. An annular magnetic air gap 3a was formed between the center hole provided at the center of the center pole 4 and the extended end 2a of the center pole 2, and the annular magnetic air gaps 3 and 3a were formed in both front and back directions of the ring magnet 5. A two-way radiation speaker 23 to which the magnetic circuit 15 is attached.