JP3531705B2 - Surface mount type electromagnetic sounding body - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic sounding body which produces a sound by vibrating a vibrating plate with an electromagnet, and more particularly to a surface mounting which is directly mounted on a substrate having a conductive pattern formed on the surface thereof. Type electromagnetic sounder.

[0002]

2. Description of the Related Art With the recent surface mounting of small electronic components, a surface mounting type electromagnetic sounding device has been devised and commercialized.

As a conventional surface mount type electromagnetic sounding body of this kind, Japanese Patent Application Laid-Open No. 8-22 filed by the applicant of the present invention is disclosed.
Some were disclosed in Japanese Patent No. 3693. The surface mount type electromagnetic sounding body has a compact outer shape by arranging the connecting portion between the end of the coil and the surface mounting terminal inside the magnet or in the notch provided in the magnet.

[0004]

In the above surface mount type electromagnetic sounding body, since the connecting portion between the coil terminal and the surface mount terminal is arranged in the magnet, the outer shape can be made extremely small. It was possible to commercialize a compact and thin surface mount type electromagnetic sounding body that has never existed before.

However, when the connecting portion is arranged inside the magnet, the diameters of the magnet and the coil are limited, and when the magnet is provided with a cutout portion, the suction balance of the diaphragm sucked by the magnet is deteriorated and abnormal vibration occurs. However, there is a problem that the sound quality may deteriorate.

The present invention has been made in view of the above problems, and an object of the present invention is to further reduce the outer diameter of the diaphragm without restricting the diameters of the magnets and coils while maintaining the structure capable of reducing the outer diameter. (EN) Provided is a surface-mounted electromagnetic sounding body capable of improving the sound quality.

[0007]

A surface mount type electromagnetic sounding body of the present invention includes a case, a yoke housed in the case, a coil attached to the yoke, and a ring arranged around the coil. A magnet having a recessed portion that has a shape and is open in the direction of the lower surface, the inner peripheral surface, and the outer peripheral surface; the diaphragm supported by the magnet or the support frame; and integrally fixed to the case, A terminal for surface mounting, which has a joining portion drawn to the outside and a mounting portion that is drawn into the recessed portion of the magnet and has the end of the coil attached from the opening on the inner peripheral surface side of the recessed portion. ,.

The surface mount type electromagnetic sounding body of the present invention is
A case, a yoke housed in the case, a coil attached to the yoke, a magnet that is arranged around the coil, has a ring shape, and has a recess that opens in the direction of the lower surface and the inner peripheral surface, The vibrating plate supported by the magnet or the support frame is integrally fixed to the case, and is joined to the outside of the case and drawn out into the recess of the magnet so that the end of the coil is inside the recess. And a terminal for surface mounting having a mounting portion mounted from the opening on the peripheral surface side.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The coil terminal and the surface mounting terminal in the surface mount type electromagnetic sound generator of the present invention are connected in the recessed part or recessed part of the magnet. Therefore, this connecting portion does not affect the diameters of the magnet and the coil, and the magnet can have a ring shape, so that abnormal vibration can be eliminated. In particular, even if the magnet is provided with a recessed portion or a recessed portion and the connecting portion between the coil terminal and the surface mounting terminal is disposed there, the outer shape does not become large.

[0010]

1 is a cross-sectional view showing the structure of a surface-mounted electromagnetic speaker according to an embodiment of the present invention, and FIG. 2 is a perspective view of the surface-mounted electromagnetic speaker shown in FIG. In the figure, 2 is a plastic case. The case 2 in this embodiment has a box-shaped outer shape having a rectangular planar shape, and is composed of an upper case 4 and a lower case 6.

Reference numerals 8 and 10 denote terminals for surface mounting, which are insert-molded on the bottom of the lower case 6. One end of each of the terminals 8 and 10 is drawn out of the lower case 6 to form a joint 8a and 10a, and the other end of the terminal 8 and 10 projects above the upper surface of the bottom of the lower case 6. To form the mounting portions 8b and 10b. In addition, the lower case 6 without the terminals 8 and 10
Dummy terminals 7 and 9 are insert-molded at the bottom corners of the bottom of the.

Reference numeral 12 is a yoke, which is a mounting portion 8b, 10b.
It is composed of a disk-shaped magnetic circuit board 12a partially provided with a notch 12b so as to escape and a center pole portion 12c rising from the center thereof.

Reference numeral 14 is a center pole portion 12 of the yoke 12.
It is a ring-shaped coil attached to the outer periphery of c. Two coil terminals 14a and 14b are drawn out from the coil 14.

Reference numeral 16 is a ring-shaped magnet, which is a yoke 12
Is installed on the magnetic circuit board 12a. The magnet 16 in the present embodiment is provided with a recessed portion 16a which is open in the direction of the lower surface, the inner peripheral surface and the outer peripheral surface.

A support frame 18 is arranged outside the magnet 16.

Reference numeral 20 is a diaphragm having a weight 20a attached to the center thereof, the outer periphery of which is placed on the support frame 18.

The surface mount type electromagnetic sounding body in this embodiment is assembled by sequentially assembling the above-mentioned respective components on the lower case 6. That is, first, the yoke 12 is fitted and fixed in the lower case 6 in which the terminals 8 and 10 and the dummy terminals 7 and 9 are insert-molded. At this time, the notch 12b of the yoke 12 is positioned so as to be located at the mounting portions 8b, 10b of the terminals 8, 10. Next, the coil 14 is attached to the center pole portion 12c of the yoke 12. At this time, the coil terminal 14
The a and 14b are guided or entangled in the direction of the attachment portions 8b and 10b of the terminals 8 and 10 to be brought into a tangled state. Next, the coil terminals 14a and 14b are attached to the mounting portions 8b and 10
Then, the magnet 16 is mounted on the magnetic circuit board 12 a of the yoke 12. At this time, the coil terminals 14a and 14b and the mounting portion 8 are provided in the recess 16a of the magnet 16.
The magnet 16 is positioned so that the connecting portion connecting b and 10b is housed. Then, the diaphragm 2 is placed on the support frame 18.
0 is placed to face the center pole portion 12c of the yoke 12 and the magnet 16, and the upper case 4 is covered and fixed thereto.

In the surface-mounted electromagnetic sounding body assembled as described above, the connecting portion connecting the coil terminals 14a, 14b and the mounting portions 8b, 10b is housed in the recess 16a of the magnet 16. The connecting portion can be arranged within the width between the outer diameter and the inner diameter of the magnet 16 without changing the diameter or outer shape of the magnet 16 and the coil 14. Also,
Since the recessed portion 16a in the present embodiment has openings on the lower surface, inner peripheral surface and outer peripheral surface side of the magnet 16, it can be formed by forming a ring-shaped magnet and then performing a cutting process. It can also be formed during magnet molding.

FIG. 3 is a sectional view showing a surface mount type electromagnetic sounding body according to a modification of the present invention, and FIG. 4 is a perspective view of the magnet shown in FIG. In this partially modified example, the magnet 16 is provided with a concave portion 16b which is open in the direction of the lower surface and the inner peripheral surface thereof, and a ring-shaped step portion 16c provided on the upper surface of the magnet 16 without providing a support frame. The diaphragm 20 is supported.

In this partially modified example, the coil end 14
The connecting portions between a and 14b and the mounting portions 8b and 10b of the terminals 8 and 10 are housed in the recess 16b of the magnet 16.
The recess 16b accommodates the connecting portions of the coil terminals 14a and 14b and the mounting portions 8b and 10b of the terminals 8 and 10, and has openings on the lower surface and the inner peripheral surface side that are the minimum necessary for drawing out the coil terminals 14a and 14b. Therefore, the recess 1
Since the change in the magnetic force and strength of the magnet 16 due to the provision of 6b can be minimized, good sound quality can be obtained.

Further, since the support frame is not used, it is possible to reduce the number of assembling steps and the number of parts.

In the above embodiment, the recess 16a and the recess 16b of the magnet 16 are formed by cutting or when the magnet 16 is molded, and the material of the magnet 16 is the recess 16a and the recess. Depending on the forming method of 16b, it is possible to appropriately select and use a material such as an iron, chrome, or cobalt magnet that can be cut, or a ferrite magnet that can be easily powder-molded or a plastic magnet that can be injection-molded. desirable.

Even in the partially modified example, the diaphragm 20 may be supported by using the support frame 18.

[0024]

According to the present invention, since the coil end and the mounting portion of the surface mounting terminal are connected in the recess or recess of the magnet, it is necessary to change the diameter or the outer shape of the magnet. Disappears. For this reason, it is not necessary to increase the inner diameter of the magnet as in the case of connecting the coil terminal and the terminal inside the magnet, so that there is no restriction on the diameter of the magnet, and the ring-shaped surface of the magnet can reduce the vibration plate. Since suction can be performed, the suction balance of the diaphragm can be improved and abnormal vibration can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of a surface-mounted electromagnetic speaker according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the surface-mounted electromagnetic speaker shown in FIG.

FIG. 3 is a cross-sectional view showing a partially modified example of the surface-mounted electromagnetic speaker shown in FIG.

FIG. 4 is a perspective view of the magnet shown in FIG.

[Explanation of symbols]

2 cases 4 upper case 6 lower case 8, 10 terminals 12 York 14 coils 14a, 14b Coil terminal 16 magnets 16a recessed portion 16b recess 16c step 18 Support frame 20 diaphragm

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-80774 (JP, A) actual development Sho 59-131797 (JP, U) actual development Sho 59-136699 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) G10K 9/13 101 H04R 13/00

Claims (4)

(57) [Claims] 1. A case, a yoke housed in the case, a coil attached to the yoke, a ring-shaped member arranged around the coil, and having a lower surface, an inner peripheral surface and an outer peripheral surface in directions. A magnet having an open recess, a support frame arranged around the magnet, a diaphragm supported by the support frame, integrally fixed to the case, and drawn out of the case. A surface mounting terminal having a joining portion and a mounting portion that is drawn into the recessed portion of the magnet and has the end of the coil attached from an opening on the inner peripheral surface side of the recessed portion. A characteristic surface mount type electromagnetic sounding body. 2. A case, a yoke housed in the case, a coil attached to the yoke, a ring-shaped member arranged around the coil, and having a lower surface, an inner peripheral surface and an outer peripheral surface in directions. A magnet having an open recess, a diaphragm supported by the magnet, a joint integrally fixed to the case, drawn out to the outside of the case, and drawn out into the recess of the magnet. A surface-mounting electromagnetic sounding body, comprising: a terminal for surface mounting, the terminal of the coil having a mounting portion mounted from an opening on the inner peripheral surface side of the recessed portion. 3. A case, a yoke housed in the case, a coil attached to the yoke, a recess arranged around the coil, having a ring shape, and opening in a direction of a lower surface and an inner peripheral surface. A magnet having a magnet, a diaphragm supported by the magnet, a joint part integrally fixed to the case, drawn out to the outside of the case, and drawn out into the concave part of the magnet, and the end of the coil is the concave part. A surface-mounting electromagnetic sounding body, comprising: a surface-mounting terminal having a mounting portion mounted from an opening on the inner peripheral surface side of the. 4. A case, a yoke housed in the case, a coil attached to the yoke, a recess arranged around the coil, having a ring shape, and opening in a direction of a lower surface and an inner peripheral surface. A magnet having a magnet, a support frame arranged around the magnet, a diaphragm supported by the support frame, a joint part integrally fixed to the case and drawn out of the case, and the magnet. A surface mounting terminal having a mounting portion that is drawn into the recess of the coil and has an end of the coil that is mounted from an opening on the inner peripheral surface side of the recess, and a surface mounting type electromagnetic sound generator. body.