JP3173242B2 - Assembly jig for magnetic circuit and manufacturing method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling jig for a magnetic circuit having an elliptical magnetic gap and a manufacturing method using the same, and particularly to a loudspeaker used for various audio equipment. Things.

[0002]

2. Description of the Related Art Various types of speakers, particularly dome-shaped tweeters and semi-dome-shaped speakers, have already been disclosed using a voice coil having an elliptical cross section. However, a method of manufacturing a magnetic circuit for the speaker has not yet been clarified. Not.

A method of manufacturing a conventional magnetic circuit for a speaker will be described below. FIGS. 4 and 5 show a method of assembling an outer-magnet type magnetic circuit and a magnetic circuit assembling jig used in a conventional method of manufacturing a magnetic circuit for a speaker having a magnetic gap having a circular cross section. 4 and FIG.
Is a lower plate having a pole piece portion 2 having a circular cross section, 3 is a ring-shaped magnet fixed on the lower plate via an adhesive, and 4 is an upper portion having a circular through hole 5 in the center. A plate 6, a magnetic gap formed by the pole piece 2 and the through hole 5, a magnetic circuit assembly jig 7 having an annular thin portion 8 corresponding to the magnetic gap 6, and a sealed air chamber 9 This hole allows the air to flow through.

A method of manufacturing a magnetic circuit of a speaker using the magnetic circuit assembling jig configured as described above will be described.
This will be described below. First, an adhesive is applied onto the lower plate 1 to fix the ring-shaped magnet 3, and the magnetic circuit assembly jig 7 is inserted into the pole piece 2 of the lower plate 1. Next, an adhesive is applied onto the ring-shaped magnet 3, the through holes 5 of the upper plate 4 are fitted into the magnetic circuit assembling jig 7, and the upper plate 4 is fixed. After drying in this state, The magnetic circuit assembly jig 7 is removed to complete the magnetic circuit in which the magnetic gap 6 is formed.

[0005]

However, as described above, in a conventional magnetic circuit for a speaker using a voice coil having a circular cross section, the shape of the magnetic gap 6 is axially symmetric. The assembly jig 7 for the magnetic circuit can be easily obtained by cutting or the like. However, when the shape of the magnetic gap 6 is elliptical, the assembly jig 7 for the magnetic circuit is required to make the magnetic gap length uniform. Must be formed in an elliptical shape, and it is difficult to determine the accuracy of the assembly jig for the magnetic circuit, and it is expected to be very difficult to manufacture, for example, it will be expensive in terms of cost.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide an assembling jig for a magnetic circuit having an elliptical magnetic gap and a manufacturing method using the same.

[0007]

SUMMARY OF THE INVENTION To solve this problem, a magnetic circuit assembling jig and a manufacturing method using the same according to the present invention provide a plurality of rod-shaped jigs having a diameter corresponding to the magnetic gap length of a magnetic circuit. A ring-shaped magnet is mounted on a lower plate having a pole piece part having an elliptical cross section, using a magnetic circuit assembly jig in which pins are arranged in accordance with the shape of the magnetic gap part and bonded to the base material. Arranged and connected, the magnetic circuit assembly jig is fitted to the pole piece portion, and the jig is fitted with the through hole of the upper plate having an elliptical through hole in the center, and is arranged. According to another aspect of the present invention, there is provided a method of assembling a magnetic circuit for a speaker in which an elliptical magnetic gap is formed by coupling to a top surface of the magnet.

[0008]

According to the present invention, a magnetic circuit for a speaker having an elliptical magnetic gap having a uniform magnetic gap length can be easily realized by using the jig constructed as described above. Furthermore, the construction of the magnetic circuit assembly jig is based on point contact, and the outer diameter of the rod-shaped pins constituting the jig is easy to obtain the accuracy, so that the accuracy of the magnetic gap length can be easily obtained and the cost is also reduced. It can be realized at low cost. Further, when incorporated in a speaker, it can contribute to solving the quality problem of abnormal sound generation such as gap rubbing.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a magnetic circuit assembly jig of this embodiment and a manufacturing method using the same.
1 and 2, reference numeral 11 denotes a lower plate having a pole piece portion 12 having an elliptical cross section, 13 denotes a ring-shaped magnet fixed on the lower plate via an adhesive,
Reference numeral 14 denotes an upper plate having a through hole 15 formed in an oval shape at the center, and 16 denotes the pole piece 12 and the through hole 15.
An elliptical magnetic gap 17 formed by: is formed by arranging a plurality of rod-shaped pins 18 having a diameter that accurately matches the magnetic gap length of the magnetic gap 16 according to the shape of the magnetic gap 16. This is an assembly jig for a magnetic circuit coupled to a member 19.

A method of manufacturing a magnetic circuit for a speaker using the magnetic circuit assembly jig 17 configured as described above will be described below. First, the lower plate 11
The ring-shaped magnet 13 is joined by applying an adhesive on the top, and the oval pole piece 1 of the lower plate 11 is joined.
2 is inserted with the magnetic circuit assembly jig 17. Next, an adhesive is applied onto the ring-shaped magnet 13 and the elliptical through-hole 15 of the upper plate 14 is fitted to the magnetic circuit assembling jig 17 to join the upper plate 14. After drying, the magnetic circuit assembling jig 17 is removed to complete the speaker magnetic circuit in which the elliptical magnetic gap 16 is formed.

As described above, according to this embodiment, when a magnetic circuit for a speaker having a magnetic gap 16 having an elliptical cross section is manufactured, a diameter that accurately matches the elliptical magnetic gap length is used. By using a magnetic circuit assembling jig 17 in which a plurality of rod-shaped pins 18 are arranged in accordance with the shape of the magnetic gap 16 and connected to a base material 19, a speaker having a magnetic gap 16 having an elliptical cross section is used. The magnetic circuit can be secured accurately and easily, and can be manufactured stably.

FIG. 3 shows a manufacturing method for assembling an inner-magnet-type magnetic circuit for a speaker using a pot-shaped yoke using the magnetic-circuit assembling jig 17 according to the present invention. Magnet 2 in the center of the inside of the yoke 20
1 is bonded by an adhesive, and an elliptical pole piece 22 is further bonded to the upper surface of the magnet 21 by an adhesive, and the magnetic circuit assembly jig 17 is fitted into the pole piece 22. The through hole of the top plate 23 having a through hole formed in an elliptical shape is fitted in the jig 17 and arranged, and the top plate 23 is bonded to the yoke 20 with an adhesive, dried in this state, and By removing the tool 17 and using the pot-shaped yoke 20, it is possible to assemble an inner-magnet type magnetic circuit for a speaker in which a magnetic gap having an elliptical cross section is formed.

The effect of the inner-magnet type magnetic circuit is the same as that of the outer-magnet type magnetic circuit, and a description thereof will be omitted.

[0014]

As described above, according to the present invention, a magnetic pin having a configuration in which a plurality of rod-shaped pins having a diameter corresponding to the length of the magnetic gap of a magnetic circuit are arranged in accordance with the shape of the magnetic gap and connected to the substrate. A circuit assembly jig can be provided at low cost, and by using this magnetic circuit assembly jig,
A speaker magnetic circuit having an elliptical magnetic gap can be assembled with a uniform magnetic gap length and high accuracy.

Further, when this magnetic circuit is incorporated in a speaker, it can contribute to solving the quality problem of abnormal sound generation such as gap rubbing.

[Brief description of the drawings]

FIG. 1 is a half sectional front view showing a configuration of an assembly jig for a magnetic circuit according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the method of manufacturing the magnetic circuit in the embodiment.

FIG. 3 is a sectional view showing a method of manufacturing a magnetic circuit according to another embodiment of the present invention.

FIG. 4 is a half sectional front view showing the configuration of a conventional magnetic circuit assembly jig.

FIG. 5 is a sectional view showing a conventional method of manufacturing a magnetic circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Lower plate 12 Pole piece part 13 Magnet 14 Upper plate 15 Through-hole 16 Magnetic gap 17 Magnetic circuit assembly jig 18 Bar-shaped pin 19 Base material 20 Vase-shaped yoke 21 Magnet 22 Pole piece 23 Top plate

Claims (3)

(57) [Claims] 1. The magnetic circuit is fitted on a pole piece of a magnetic circuit.
An assembly jig for a magnetic circuit , wherein a plurality of rod-shaped pins having a diameter corresponding to the magnetic gap length of the magnetic circuit are arranged in accordance with the shape of the magnetic gap portion and are joined to a base material. jig. 2. A ring-shaped magnet is arranged and coupled to an upper surface of a lower plate having a pole piece part having an elliptical cross section, and the magnetic circuit assembly jig according to claim 1 is fitted to said pole piece part. An elliptical magnetic gap portion is formed by fitting the through hole of an upper plate having an elliptical through hole in the center into the assembly jig for the magnetic circuit and connecting the upper plate to the upper surface of the magnet. A method for manufacturing a magnetic circuit for an external-magnet-type speaker, on which is formed. 3. A magnet arranged and connected to the center of the pot-shaped yoke, and a pole piece having an elliptical cross section is arranged and connected to the upper surface of the magnet. An elliptical magnetic gap is formed by arranging a top plate having holes and fitting the magnetic circuit assembly jig according to claim 1 to a pole piece, positioning the top plate and connecting the top plate to a yoke. Of manufacturing a magnetic circuit for an internal magnet type speaker.