JP2000350276A - Loudspeaker and loudspeaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a nondirectional loudspeaker of a loudspeaker system which makes it possible to drive plural loudspeakers for a mid-range to a high range by using one shielded magnetic circuit. SOLUTION: An external magnetic circuit is composed of two magnets, a magnetic gap part 17 is formed between a plate 4 or yoke 1 provided in the two magnets 3 and 5 and a shield cover 10, and loudspeakers for a mid- range to a high range are arranged at the outer periphery of the shield cover 17 to provide a nondirectional loudspeaker or a loudspeaker system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker or a loudspeaker device capable of driving at least one loudspeaker for medium or treble sound or a treble sound using a loudspeaker having one magnetically shielded magnetic circuit.

[0002]

2. Description of the Related Art Heretofore, a magnetic circuit used in a speaker has used a magnetic shield type cancel magnet to increase the magnetic flux density in a magnetic gap portion in which a voice coil is pivotably pivoted to reduce the driving force. The present applicant has proposed a magnetic circuit that is approximately twice as large as a magnetic circuit using one magnet.

FIG. 8 is a sectional view showing a main part of the above-described magnetic circuit. In FIG. 8, reference numeral 1 denotes a yoke made of a substantially disk-shaped metal, which has a columnar center pole 2 at the center of the disk, is integrated with the yoke 1, and has a substantially inverted T-shaped cross section. Have been. On the yoke 1, S.P. N
Concentric first magnet that becomes a cancellation magnet magnetized with
The magnets 3 are joined via an adhesive or the like.

[0004] A first plate 4 made of concentric metal is bonded on the first magnet 3 with an adhesive or the like, and a first concentric metal plate serving as a second main magnet is formed in the first direction in the thickness direction.
A second magnet 5 magnetized with N and S in the direction opposite to the thickness direction of the magnet 3 is bonded on the first plate 4 with an adhesive, and the second magnet 5 is formed of a concentric metal. The second plate 6 is bonded with an adhesive or the like, and the yokes 1 to 2 are placed in a shield cover 10 made of a bottomed cylindrical metal.
The magnetic circuit up to the plate 6 is inserted and fixed to form a magnetic circuit.

A magnetic gap 9 formed between the inner diameter of the first plate 4 and the outer diameter of the center pole 2 in such a magnetic circuit.
A voice coil 8 wound around a voice coil bobbin 7 pivotally attached to a frame or the like in a vertical direction via a diaphragm is interposed therein, and an acoustic signal is supplied to the voice coil 8 to drive the diaphragm. are doing.

According to the magnetic circuit having the above-described configuration, the N pole of the first magnet 3 passes through the magnetic gap 9 via the yoke 1 and the center pole 2, and passes through the first plate 4 via the first plate 4.
The first magnetic flux φ ₁ flowing in the magnetic path reaching the S pole of the magnet 3 and the magnetic gap between the N pole of the second magnet 5 and the second plate 6 and the center pole 2 and the center pole 2
And the magnetic flux φ ₂ flowing through the magnetic path to the S pole of the second magnet 5 via the first plate 4 via the magnetic gap 9 via the first magnetic field, the magnetic gap 9 of the conventional external magnet type magnet. The magnetic flux density of the magnetic gap 9 is increased as compared with the case where the utilization efficiency of the inside is only about 1/3 of the total magnetomotive force of the first and second magnets 3 and 5, and the driving force of the diaphragm is increased. Can be substantially doubled.

[0007]

A low-mid speaker is constructed using the above-described magnetic circuit shown in FIG. 8, and a coaxial speaker is often used when a high-tone speaker is added. For this purpose, a separate magnetic circuit must be prepared, and it is difficult to obtain an omni-directional speaker with directional characteristics. Since the loudspeaker is of the coaxial type, the directional characteristics cannot be freely selected.

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problem, and uses at least one medium-high sound speaker or high sound speaker as a shield cover by using one magnetic shield type magnetic circuit constituting a low medium sound speaker. It is an object of the present invention to provide a speaker and a speaker device formed along the outer periphery of the speaker 10.

[0009]

SUMMARY OF THE INVENTION A speaker according to the present invention is a magnetic shield type speaker having an outer magnet type magnetic circuit, wherein a yoke or a plate provided between a cancel magnet and a main magnet constituting the outer magnet type magnetic circuit and a shield cover. At least one magnetic gap is formed therebetween, and a medium or high frequency speaker is provided.

A speaker device according to the present invention is a magnetic shield type speaker having an external magnetic circuit, wherein at least one yoke or plate provided between a cancel magnet and a main magnet constituting the external magnetic circuit and at least one plate between a shield cover. A speaker in which a magnetic gap portion is formed and a speaker for medium or high frequency sound or high frequency sound is disposed is opposed to a speaker mounting hole formed in a top plate or a bottom plate of a speaker box.

According to the loudspeaker and the loudspeaker device of the present invention, it is possible to provide a plurality of loudspeakers for medium or high frequency or high frequency by using one magnetic shield type magnetic circuit for low and medium frequency.
The treble speaker can be made non-directional, and the directional characteristics can be freely selected.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a speaker and a speaker device according to the present invention will be described below with reference to FIGS.

FIG. 1 is a side sectional view of a speaker according to the present invention, and FIG.
FIG. 3 is another side sectional view of the speaker of the present invention, FIG. 3 is still another side sectional view of the speaker of the present invention, FIG. 4 is an explanatory view of a magnetic circuit used in the speaker of the present invention, and FIG. FIG. 6 is a perspective view showing an assembled state of another magnetic circuit to be used, FIG. 6 is a sectional side view showing an embodiment of the speaker device of the present invention, and FIG. 7 is a sectional side view showing another embodiment of the speaker device of the present invention. .

An embodiment of a speaker used in the present invention will be described below with reference to FIG.

In FIG. 1, the magnetic circuit used for the speaker 11 of this embodiment has a magnetic-shield type configuration. Specifically, a ring-shaped S.O.M. in the thickness direction, for example, is provided below the center pole 2 erected in the center of the disk-shaped yoke 1. A first magnet 3 constituting a cancel magnet magnetized with N is joined via an adhesive, and a thickness direction of the first magnet 3 constituting a ring-shaped main magnet is reversed on the upper side of the yoke 1. For example, N. The S and the magnetized second magnet 5 are joined via an adhesive, and a ring-shaped plate 6 is joined on the second magnet 5.

The bottom surface of the first magnet 3 is joined to the inner surface of the bottom plate of a cylindrical shield cover 10 having a bottom. The position of the cylindrical portion of the shield cover 10 facing the outer periphery of the yoke 1 is shown in FIG. As will be described later, at least one circular magnetic gap 17 is formed.

The upper inner diameter portion of the cylindrical portion of the shield cover 10 is configured to be in contact with the outer periphery of the plate 6 to form a magnetic shield type magnetic circuit.

A frame 12 pressed with a funnel-shaped metal or the like is fixed to the upper side of the plate 6 by tacking or the like.

The voice coil 8 wound around the voice coil bobbin 7 is inserted between the magnetic gap 9 formed between the inner diameter of the ring-shaped plate 6 and the outer diameter of the center pole 2, and the concentric corrugated damper 14 is formed. The inner diameter portion is stuck to the outer diameter portion of the voice coil bobbin 7, the outer diameter portion of the damper 14 is stuck to the outer diameter portion of the bottom surface of the frame 12, and the voice coil 8 can be swung up and down in the magnetic gap portion 9. Pivot to.

Further, the inner diameter portion of the cone-shaped diaphragm 15 is joined to the upper outer diameter portion of the voice coil bobbin 7 with an adhesive, and the outer peripheral portion of the edge 16 of the diaphragm 15 having the fixed edge or the free edge 16 is joined. The diaphragm 15 is pivotally attached to the frame 12 by being joined to the outer periphery of the maximum diameter of the frame 12 via a gasket 18 so that the diaphragm 15
Of the drive system.

Reference numeral 21 denotes an input terminal fixed on the frame 12. The input terminal 21 is connected to the voice coil 8 via a tinsel wire 20, and an acoustic signal is supplied to the voice coil 8 to drive the diaphragm 15. Is done.

As shown in FIG. 4A, at least one yoke 1 shown in FIG.
In (A), three projections 1a, 1b, 1c are projected in the radial direction, and this projection 1a is curled in a semicircular shape, and at the tip thereof, disc-shaped pole pieces 22a, 22b,
22c are integrally formed, and the pole pieces 22a, 22b, 22c # are inserted into at least one circular through-hole formed on the cylindrical outer periphery of the shield cover 10 to form the magnetic gap 17, 17 #. It is made to form.

In FIG. 4A, 3
The voice coils 24a, 24b, 24c are wound around the three voice coil bobbins 23a, 23b, 23c, and the dome-shaped vibrating body 2 is wound around the voice coil bobbins 23a, 23b, 23c.
6a, 26b, 26c and concentric edge 27 of waveform
a, 27b and 27c are integrated into an edge 27a, 27c.
b, 27c are concentric gaskets 28a, 28
The b and 28c are joined to the cylindrical outer periphery of the shield cover 10 to constitute at least one middle / treble speaker or treble speaker.

The speaker 11 shown in FIG. 2 shows another configuration example of this embodiment. The magnetic circuit is the same as that shown in FIG. 8 except for the configuration of the shield cover 10 and the first plate 4. FIG. 1 shows a driving system for a low-middle sound diaphragm and a driving system including at least one middle-high sound or high-sound speaker vibration plate provided on the outer periphery of the shield cover 10.
Therefore, the corresponding parts are denoted by the same reference numerals, and redundant description will be omitted. Only the parts different from those in FIGS. 1 and 8 will be described below.

The first plate 4 used in the magnetic circuit shown in FIG.
FIG. 4B is a perspective view showing one embodiment of the present invention. In this embodiment, a voice coil 8 constituting a drive system for a low / middle sound vibration system is inserted into a magnetic gap 9 having a high magnetic flux density formed between the inner diameter of the first plate 4 and the outer diameter of the center pole 2. It is pivotally mounted so as to be swingable in the vertical direction.

The outer peripheral portion of the first plate 4 is, for example, 120 ° around the center O of the first plate 4 in FIG.
The projections 1a, 1b, 1c are formed in the radial direction at the angular position of, and the ends of the projections 1a, 1b, 1c are bent downward at right angles to form bent portions, and the pole is formed in a substantially disk shape. The pieces 22a, 22b, 22c are fixed to the bent portions with studs or the like, and the outer circumferences of the pole pieces 22a, 22b, 22c are circular magnetic gaps 1 formed in the shield cover 10.
7 is inserted.

The shield covers are a cylindrical first shield cover 10a having a bottom and a cylindrical second shield cover 10a.
b, semicircular grooves are formed in the first and second shield covers 10a and 10b in the circular magnetic gap portion, and the two first and second shield covers 10a and 10b are formed. When superimposed, the semi-circular magnetic gaps 17a and 17b, 17c and 17d, 17e and 17f (not shown) formed by the semi-circular grooves shown in FIG. 2 form circular magnetic gaps 17a to 17f. 17f is formed so that the magnetic circuit can be easily assembled.

As shown in FIG. 1, the diaphragms 26a, which constitute three treble speakers, are located at positions where the outer circumference of the shield cover 10 is divided into three equal parts as in FIG.
26b and 26c are arranged so as to be swingable.

FIGS. 3 and 5 show still another configuration of the speaker 11 of the present invention. The speaker 11 and the magnetic circuit of FIG. 3 have substantially the same configuration as that of FIG.
Are different from each other, and these will be described with reference to the perspective view of FIG.

In FIG. 3 and FIG. 5, the first shield cover 10a is formed by pressing a metal having high magnetic permeability into a cylindrical shape having a bottom, and a semicircle at an angle of 180 ° above and below the cylindrical portion passing through the center of the bottom. The through holes 30c and 30d are formed. The bottom of the yoke 1 is joined to the upper surface of the bottom of the first shield cover 10a, and the S.V. The first magnet 3 magnetized with N is joined on the yoke 1, and the first plate 4 is further joined on the first magnet 3.

The first plate 4 is formed in a ring shape as shown in the perspective view of FIG. 5, has a through hole 4a in the center, and has a projection projecting radially at an angle of 180 degrees up and down on the outer periphery. A first portion made of a disk-shaped magnetic metal serving as a center pole is formed at the tip of each of the protrusions 1a and 1b.
Then, the second pole pieces 22a and 22b are fixed by spot welding or tacking.

On one side of the front surface of the first plate 4 described above, a concentric circle having a diameter smaller than the diameter of the first plate 4 and having an inner diameter larger than the inner diameter of the through hole 4 a of the first plate 4. In the thickness direction. S and the magnetized second magnet 5 are joined via an adhesive or the like.

When joining the first plate 4 on the first magnet 3, the first and second pole pieces 22
The first and second cylindrical gap guides are formed so that magnetic gaps 17b and 17d having a predetermined gap length are formed between the outer peripheral portions of the first and second shield holes 10a and 10b and the semicircular through holes 30c and 30d of the first shield cover 10. Through the pole pieces 22a and 22b. Of course, the magnetic gap 9 is also adjusted via the gap guide so as to form a predetermined gap.

Next, on the upper side of the first plate 4, the same shape as that of the first magnet 3 is set. The S and the magnetized second concentric magnet 5 are joined via an adhesive.

After joining the second ring-shaped plate 6 to the upper surface of the second magnet 5, the second shield cover 10b is joined to the outer periphery of the second plate 6 after the second shield cover 10b is joined to the second shield cover 10b. Predetermined magnetic gaps 17a and 17c are formed between the inner circumferences of the formed semicircular through holes 30a and 30b and the outer circumferences of the first and second pole pieces 22a and 22b.
Thus, the second shield cover 10b is joined to the outer periphery of the second plate 6 via a gap guide.

In the loudspeaker 11 having the above-described configuration, the two loudspeakers 2 provided on the outer periphery of the first and second shield covers 10a and 10b are provided.
One high frequency speaker and a normal low / middle frequency speaker provided on a magnetic shield type magnetic circuit can be easily constituted by one magnetic circuit.

Further, the directional characteristics can be freely selected, and a non-directional speaker can be easily obtained.

Further, the magnetic flux applied to the magnetic gaps 17 and 17a to 17f of the loudspeaker for the middle and treble section, the two magnets are added to each other, so that the magnetic flux density is increased and the magnetic force is effectively increased. Will be available.

FIGS. 6 and 1 show side sectional views when the above-described speaker is used as an omnidirectional speaker device.

FIG. 6 shows diaphragms 26a, 2a such as insulating lugs on first shield cover 10a of speaker 11 shown in FIG.
For example, a cylindrical speaker box is provided in which input terminals 37 and 37 for driving 6b and 26c are provided, and a support string 32 is hung from the ceiling 31 to surround the frame 12 of the diaphragm 15 for low and medium sounds. 33, a duct 34 is provided to radiate low and medium sounds from the top and bottom and in the horizontal direction from the duct 34, and to generate middle and high sounds or high sounds from the first to third diaphragms 26a,
The speaker device radiates horizontally in three directions from 26b and 26c and is omnidirectional.

FIG. 7 shows a normal box-shaped speaker box 33.
A speaker 34 is formed on a top plate of a speaker box 33, and a speaker sound emitting hole 35 is formed on a top plate of the speaker box 33. The speaker 11 described in detail in FIG. is there. Note that c indicates a low-frequency cut capacitor.

In the loudspeaker device having this configuration, the low and middle sounds from the diaphragm 15 are radiated through the duct 34 and the opening 36 formed in the frame 12 so as to have a non-directional characteristic in the horizontal direction as shown by an arrow D. , Diaphragms 26a, 26b, 26
7 are also radiated horizontally in three directions within an angle range of 120 degrees as shown by the arrow D in the speaker of FIG. I can do it.

[0043]

According to the present invention, the following effects can be obtained. (A) An omnidirectional speaker or speaker device can be easily configured over the entire band. (B) As a magnetic circuit of the loudspeaker, it is possible to drive one low / middle sound speaker and a plurality of middle / high sound or high sound speakers by using only one magnetic shield type magnetic circuit. (C) The magnetomotive force of the two magnets can be used effectively,
The magnetic flux density of the plurality of magnetic gaps is increased. (D) A magnetic circuit of a magnetic-shield type can be provided.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one embodiment of a speaker of the present invention.

FIG. 2 is a side sectional view showing another embodiment of the speaker of the present invention.

FIG. 3 is a side sectional view showing still another embodiment of the speaker of the present invention.

FIG. 4 is a perspective view of a yoke and a plate used in the present invention.

FIG. 5 is an explanatory view showing an assembled state of a magnetic circuit used for the speaker of the present invention.

FIG. 6 is a side sectional view showing one embodiment of the speaker device of the present invention.

FIG. 7 is a side sectional view showing another embodiment of the speaker device of the present invention.

FIG. 8 is a side sectional view of a conventional magnetic circuit.

[Explanation of symbols]

1} yoke, 1a, 1b, 1c projection, 2 center pole, 3 first magnet, 4 first plate, 5 second magnet, 6 second Plate, 8 ‥‥ voice coil, 9, 17, 17a to 17f ‥
{Magnetic gap, 11} speaker, 15, 26a, 26
b, 26c {diaphragm, 22a, 22b, 22c} pole piece

Continued on the front page (72) Inventor Kenji Tokushige 6-35 Kitashinagawa, Shinagawa-ku, Tokyo F-term (reference) in Sony Corporation 5D012 CA09 DA04 FA05 FA08 GA01 5D018 AF30

Claims (3)

[Claims] 1. A magnetically shielded speaker having an external magnetic circuit, wherein at least one magnetic gap is provided between a yoke or plate provided between a cancel magnet and a main magnet constituting the external magnetic circuit and a shield cover. To form
A loudspeaker comprising a speaker for middle or high frequency sounds or a high frequency sound. 2. The yoke or plate has at least one
2. The speaker according to claim 1, wherein two projections are formed, and a pole piece is formed at a tip of the projection. 3. A magnetically shielded loudspeaker having an external magnetic type magnetic circuit, wherein at least one magnetic gap is provided between a yoke or plate provided between a cancel magnet and a main magnet constituting the external magnetic type magnetic circuit and a shield cover. To form
A loudspeaker device comprising: a speaker provided with a medium or treble speaker or a treble speaker disposed opposite a speaker mounting hole formed in a top plate or a bottom plate of a speaker box.