JPH0965487A - Electromagnetic sounder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic sounder with high reliability in which the generation of the slack of the coil winding of a coil bobbin is prevented, the generation of distortion of a sound signal caused by the contact of the coil winding to a diaphragm or a broken coil winding at assembling is prevented. SOLUTION: A diaphragm, a coil 4 vibrating the diaphragm, a coil bobbin 22 to which a couple of lead terminals 25, 26 are arranged, and a yoke board are sequentially arranged in a package. An outer circumferental coil winding 29 of the coil 4 is wound on a projection 27 formed to one side face of the coil bobbin 22 and an inner circumferential coil winding 30 is inserted to the other side face and wired to a major side opposite to the side on which the coil 4 is arranged and connected to lead terminals 25, 26. A recessed part 28 is provided between the lead terminals 25, 26 at the major side opposite to the side of the coil bobbin 22 and the outer circumferential coil winding 29 and the inner circumferential coil winding 30 are in crossing while keeping electric insulation in the recessed part 28.

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 having a structure in which a coil is attached and the coil wire is soldered to a lead terminal.

[0002]

2. Description of the Related Art An electromagnetic sounding body is used as a voice generating component such as a handset of a telephone. A conventional electromagnetic speaker is, for example, shown in a sectional view of FIG. 4, an exploded view of FIG. 5, and an external perspective view of FIG.
In some cases, a magnetic flux generating means combining a vibrating plate 3, a coil 4 and a magnet 5 is arranged inside a container body composed of a yoke plate 2 serving as a container cover.

A sound leakage hole 7 to which an acoustic resistance cloth 6 such as Tetron mesh is attached is formed on the bottom surface of the container 1.
On its inner wall, a first step portion 8 on which the diaphragm 3 is placed from the bottom side, a second step portion 9 on which a magnetic flux generating means combining the coil 4 and the magnet 5 is placed, and the yoke plate 2
A third step portion 10 for mounting the is formed. At the center of the yoke plate 2, a protrusion 11 that protrudes toward the inside of the container 1 is formed.
Are formed.

The diaphragm 3 is placed on the first step portion 8 and fixed inside the container 1 with an adhesive 12. The vibrating plate 3 is made of thin magnetic material such as aluminum or SUS304 or a resin film, and is made of 42Ni-Fe alloy or the like in order to improve the magnetization efficiency by the magnetic flux emitted from the protrusion 11 of the yoke plate 2. A small disk-shaped armature (magnetic metal plate) 12 is arranged. This amateur 12 is usually attached to the central portion of the diaphragm 3 by spot welding or an adhesive layer made of an epoxy resin adhesive.
Fixed.

A coil 4 and a magnet 5 which are combined with the diaphragm 3 and serve as magnetic flux generating means are fixed to a plastic coil bobbin body 13, and the coil 4 is fixed by winding a wire rod around the insert bobbin 14. The magnet 5 is bonded around the insert bobbin 14. These are placed on the second step portion 9.

The container 1 has a diaphragm 3 and a coil bobbin body.
13 is fixed via an adhesive, and the yoke plate (lid) 2 is placed on the third step portion 10 so as to close the opening of the container 1 and fixed by an adhesive or a mechanical structure. There is.

As a result, the inside of the container 1 is partitioned by the diaphragm 3 into the sound output side space (front air chamber) A and the back surface side space (rear air chamber) B, and the coil 4 and the magnet 5 arranged on the sound output side. The vibrating plate 3, particularly the armature 12 thereof, is magnetized by the magnetic flux generated by the magnetic flux emitted from the protrusion 11 of the yoke plate 2 made of a magnetic material such as iron.

A coil bobbin body 13 is provided on the side of the container 1.
The lead terminals 16 and 17 fixed to the end 15 of the are exposed, and the AC signal corresponding to the audio signal given to the coil 4 is supplied from the external drive circuit as a current signal through the lead terminals 16 and 17. To be done.

Then, these lead terminals 16 are attached to the coil 4.
When an AC signal corresponding to the audio signal is given via 17, the strength of the magnetic flux emitted from the protruding portion 11 of the yoke plate 2 and the direction of generation of the magnetic flux fluctuate, and the diaphragm 3 flexurally vibrates accordingly. Will be done.

As a result, the air in the front air chamber A and the air in the rear air chamber B vibrate, and acoustic signals of a predetermined frequency are emitted from the sound emission holes 18 ... Formed on the surface of the yoke plate 2. Will be. Note that the magnetic flux corresponding to the audio signal leaks to the outside of the sound emitting side of the container 1, and if the leak magnetic flux is captured by a pickup coil or the like, the hearing-impaired person can obtain the audio signal.

In the conventional electromagnetic sounding body having the above structure, the connection between the coil 4 and the lead terminals 16 and 17 is
Coil bobbin body 13
It was routed to the lead terminals 16 and 17 side along the main body of, and was connected by soldering by twisting it from the coil winding at the root of the lead terminals 16 and 17 to the bare portion.

FIG. 7 is a plan view showing how such a conventional coil wire is drawn out. In the figure, 13 is a coil bobbin body, 14 is an insert bobbin, 4 is a coil, 15 is an end portion of the coil bobbin body 13, and 16 and 17 are lead terminals.

In the example of the figure, one coil winding 19 drawn from the outer periphery of the coil 4 is hooked on a coil wire hooking portion 20 provided on the side surface of the main body of the coil bobbin body 13 and then passed through the lower surface of the coil bobbin body 13. One lead terminal 16
It is routed up to and fixed to the base of the lead terminal 16 by
It is connected. On the other hand, the coil winding 21 pulled out from the inner circumference of the coil 4 is routed from the side surface of the coil bobbin body 13 to the other lead terminal 17 through the lower surface to lead the lead terminal.
It is fixed and connected to the root of 17 by twisting.

[0014]

However, in the above-mentioned conventional electromagnetic type sounding body, the coil bobbin body is used.
When vibration or the like is applied to the coil winding 13 and the coil 4, the coil winding 19 or 21 may be slackened, and for example, the coil winding 19 'shown by the alternate long and short dash line in FIG.
And especially when it sags in the thickness direction of the electromagnetic type sounding body,
The slack coil winding 19 'comes into contact with the diaphragm 3 as shown in FIG. 4, and as a result, the audio signal is distorted.

When the coil winding 19 or 21 sags in the outer peripheral direction of the coil 4, the slack coil winding 19 or 21 is caught in a corner of the container 1 during assembly of the electromagnetic type sounding body and is disconnected. There was also the problem of doing it.

The present invention has been devised in view of the above problems, and an object thereof is to prevent slack of a coil winding and to generate distortion of a voice signal due to contact with a diaphragm or to assemble a sounding body. Prevents the coil winding from breaking during
It is to provide a highly reliable electromagnetic sounding body.

[0017]

According to the present invention, there is provided an electromagnetic sounding body in which a vibrating plate having a magnetic metal plate attached thereto and a coil for vibrating the vibrating plate are provided on one main surface and from the outside. The coil bobbin body having a pair of lead terminals to which electric signals are applied respectively at the ends and the yoke plate are sequentially arranged, and the outer peripheral coil winding drawn from the outer periphery of the coil is one of the coil bobbin bodies. The pair of lead terminals are wound around the protrusions formed on the side surfaces to the other main surface side, and the inner circumference side coil winding drawn from the inner circumference is routed to the other main surface side through the other side surface. An electromagnetic type sounding body connected to the coil bobbin body, wherein a concave portion is provided between the pair of lead terminals on the other main surface side of the coil bobbin body, and the outer peripheral side coil winding and the inner peripheral side are provided in the concave portion. Coil winding And it is characterized in that it intersects with air insulation.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Since the cause of the slack of the coil windings 19 and 21 as described above is the biting of the coil windings 19 and 21 into the coil 4, in order to prevent such biting, The coil windings 19 and 21 may be partially fixed.

According to the electromagnetic type sounding body of the present invention, the outer peripheral coil winding drawn from the outer circumference of the coil is twisted on the protrusion which is a coil wire hooking portion formed on one side surface of the coil bobbin body, and then the other is wound. Since it is routed to the main surface side,
When the outer peripheral coil winding is bent and fixed to the root of the lead terminal, slack of the coil winding does not occur particularly in the thickness direction of the electromagnetic speaker.

Further, according to the electromagnetic type sounding body of the present invention, the concave portion is provided between the pair of lead terminals on the other main surface side of the coil bobbin body, and the outer peripheral side coil winding drawn out from the coil is formed in the concave portion. Since the inner circumference side coil windings are three-dimensionally crossed with electrical insulation, the coil windings do not sag in the outer circumferential direction of the coil. Here, the outer circumference side coil winding and the inner circumference side coil winding intersect three-dimensionally in the recess, and since tension is applied to each coil winding, there is a space between them. Since a large gap is formed, it will have electrical insulation and will not short-circuit, but normal insulation material may be interposed at the intersection of windings to further ensure electrical insulation. Needless to say.

Therefore, according to the electromagnetic type sounding body of the present invention, the slack of the coil winding can be surely prevented, so that the distortion of the audio signal due to the contact of the slack coil winding with the diaphragm, Alternatively, it is possible to prevent disconnection of the coil winding at the time of assembling the sounding body, resulting in a highly reliable electromagnetic sounding body.

The electromagnetic sounding body of the present invention will be described below in detail with reference to the drawings.

The electromagnetic sounding body of the present invention is characterized by the coil bobbin body and the winding of the coil winding in the coil bobbin body, and the other parts are almost the same as those of the conventional electromagnetic sounding body shown in FIGS. It is the same.

FIG. 1 is a plan view showing a coil bobbin body in an embodiment of the electromagnetic speaker of the present invention, FIG. 2 is a partially enlarged view thereof, and FIG. 3 is a partially enlarged perspective view thereof. 2 and 3 show a state in which the coil bobbin body of FIG. 1 is viewed from the opposite side.

In these drawings, the coil bobbin body 22 has a substantially plate-like shape, and the insert bobbin 23 has a through hole in the substantially central portion on the one main surface side shown as the upper surface side in FIG.
And a coil 4 is formed by winding a coil winding around the insert bobbin 23. As such a coil winding, a copper-polyurethane wire having a wire diameter of about 0.03 to 0.90 mm is used.

A pair of lead terminals 25 and 26 extending to the outside are integrally formed by molding or the like at the end 24 which is constructed so as to project from a part of the container to the outside. ing.

Further, a protrusion 27 serving as a coil catching portion is formed on one side surface of the coil bobbin body 22 so as to be positioned in the immediate vicinity of the coil 4, and between the pair of lead terminals 25 and 26 on the other main surface side. A recess 28 is formed.

The outer peripheral coil winding 29 pulled out from the outer periphery of the coil 4 is bent by the protrusion 27 for about 1 to 5 turns, is routed to the other main surface side, and is pulled out from the inner periphery. The side coil winding 30 is routed to the other main surface side through the other side surface opposite to the side surface on which the protrusion 27 is formed,
The outer circumference side coil winding 29 is connected to the lead terminal 25, and the inner circumference side coil winding 30 is connected to the lead terminal 26 so that both coil windings 29 and 30 do not come into contact with each other and short-circuit. Wirings are formed in the recesses 28 so as to intersect three-dimensionally with electrical insulation.

With the above configuration, the coil winding 29.
The slack of 30 can be reliably prevented, and like the conventional electromagnetic sounding body, a diaphragm in which a metal magnetic material is attached to a plurality of steps provided on the inner surface of the container and the coil bobbin body 22
By sequentially arranging the magnet and the yoke plate serving as the lid, the electromagnetic speaker is produced.

The position and size of the protrusion 27 are appropriately set according to the specifications of the sounding body and the coil bobbin body 22. If the position is set outside the winding end point of the outer peripheral coil winding 29 and the lead terminal 26, the outer peripheral coil winding 29 will not be displaced due to being caught in the protrusion 27, and the outer peripheral coil winding 29 will not be displaced. It is preferable in that it does not sag.

The cross-sectional shape may be appropriately set to a cylindrical shape, a prismatic shape, a trapezoidal shape, or the like.

The shape, size, and depth of the recess 28 are such that the outer coil coil 29 and the inner coil coil 30 do not come into contact with each other as shown in FIGS. The coil winding 29 and the coil winding 29
It is preferred that the pull lengths of 30 be different.

In the coil bobbin body 22 shown in FIGS. 1 to 3, a portion where the inner circumference side coil winding 30 is routed to the other main surface side through the other side surface opposite to the side surface on which the protrusion 27 is formed. The notch 31 is provided in order to surely apply tension to the inner circumference side coil winding 30, but this is not always necessary as a notch, and a protrusion or a groove is not necessary. It may be provided, or the side surface may be formed in a bent shape so as to follow it.

Further, the lead terminals 25 and 26 are provided with through holes 25a and 26a having an opening diameter of 0.5 to 2.0 mm which penetrates in the thickness direction,
Width of slit 0.3 to 1.0 that connects with the through holes 25a and 26a
An example in which the notches 25b and 26b of mm are formed is shown.

By using the lead terminals 25 and 26 as described above, when the coil windings 29 and 30 are entangled at their roots and temporarily fixed and then soldered by the solder dip method, the cutouts 25b and 26b are formed. When you pull it up so that the forming direction is downward, the solder that blocks the through holes 25a and 26a is notched 25b and
Since it flows down through 26b, it is preferable that the through holes 25a and 26a are not blocked by the solder.

Therefore, when connecting a lead wire from an external circuit, the tip of the lead wire can be securely and firmly joined to the lead terminals 25, 26 through the through holes 25a, 26a.

Next, other constituent members of the electromagnetic sounding body of the present invention will be described.

The container is made of ABS plastic or liquid crystal polymer and has a diameter of 15 to 25 mm and a height of 1 to
It has a bottomed cylindrical shape of 3 mm, and a sound leakage hole to which an acoustic resistance cloth such as Tetoron mesh is attached is formed on the bottom surface thereof. Further, a plurality of step portions are provided around the inner wall of the container from the bottom surface side, and a diaphragm plate, a coil bobbin body 22, and a yoke plate also serving as a lid are placed on each step portion.

The yoke plate, which also serves as a lid, has a shape in which a plate-shaped portion made of a magnetic metal material such as iron plated with Ni is fitted into a stepped portion formed on the inner wall of the container. At the center of the plate-like portion, a protrusion protruding toward the inside of the container is formed with a diameter of 2 to 5 mm and a height of 0.5 to 1.5 mm. The protruding portion serves as a yoke portion, which penetrates the central hole of the coil bobbin body 22. Further, a plurality of sound emitting holes are formed on the surface of the yoke plate.

The vibrating plate is placed on a stepped portion formed on the inner wall of the container and fixed with an adhesive such as silicone. This diaphragm is made of resin such as polyimide, polyetherimide or PPS non-magnetic material, or magnetic metal material such as SUS430 stainless or Ni-Fe alloy, for example, diameter 18 mm, thickness 0.1 m.
42 alloy or SUS for improving the magnetizing efficiency by the magnetic flux emitted from the protrusion of the yoke plate on a plate of about m
4.8 mm diameter, made of 430 series stainless steel, thickness
An armature (magnetic metal plate) of about 0.2 mm is attached with a relatively soft adhesive.

The magnet is, for example, a rubber component and ferrite, or Fe-Al-Ni-Co system, Cu-Ni-.
Solidified by mixing with magnetic steel components such as Fe system,
It has a ring shape so as to be arranged around the coil 23. Such a magnet has a magnetic force of about 300 to 1,000 gauss. Then, the coil bobbin body 22 is placed on one main surface and fixed by an epoxy adhesive or the like.

In the electromagnetic sounding body of the present invention, when the diaphragm is made of a magnetic material, the entire diaphragm is magnetized by the magnetic flux from the coil 4 which is the magnetic flux generating means and the magnet. Larger capacity. Therefore, the degree of influence on the diaphragm is increased, and the sound pressure level of the acoustic characteristics is greatly improved.

Here, the amateur is for concentrating the holding force in the central portion of the diaphragm to increase the influence of vibration particularly in the central portion of the diaphragm. It is not formed to generate a storage capacity.

In the electromagnetic sounding body of the present invention, the frequency of the acoustic characteristics can be easily adjusted by the sound leakage hole formed in the container and the opening degree of the mesh of the acoustic resistance cloth attached to the sound leakage hole.

In the electromagnetic sounding body of the present invention, the above-mentioned shape of the yoke plate, the fixing method, the container structure, and the like can be variously changed, and the shape and the structure of the coil bobbin body 22 can also be changed. Various modifications and improvements can be added without departing from the spirit of the invention.

[0046]

EXAMPLES Specific examples of the electromagnetic sounding body of the present invention are shown below. First, a pair of metal pieces serving as lead terminals were sandwiched and set in a predetermined mold, and resin molding was performed to produce a coil bobbin body 22 having the shape shown in FIG.

Next, after the coil winding is entangled and temporarily fixed to the root of one of the lead terminals 25, the coil winding is drawn through the recess 28 and the notch 31 to insert the bobbin.
The coil 4 is wound around the coil bobbin 23 a predetermined number of times to form a coil 4, and then the coil bobbin body 22 is twisted once on a protrusion 27 formed on one side of the coil bobbin body 22 and then electrically insulated from the previous coil winding in the recess 28. And crossed three-dimensionally, and pulled it up to the root of the other lead terminal 26.

Next, the coil windings twisted at the roots of the lead terminals 25 and 26 were soldered by the solder dip method.
At this time, a heat-resistant liquid crystal polymer was used for the resin of the coil bobbin body 22 so that the lead terminals 25 and 26 could not be removed from the coil bobbin body 22 by the heat from the solder.

Further, as shown in FIG. 4, a container 1 having a plurality of stepped portions formed therein is prepared, and a predetermined sound leakage hole 7 is provided on the bottom surface thereof in order to equalize the sound pressure characteristics in the high frequency range. As an acoustic resistance cloth 6, a Tetoron mesh was attached by ultrasonic waves. Next, the 42 alloy diaphragm 3 having the 42 alloy armature 12 attached to the center thereof is fixed to the first step portion 8 with silicone rubber, and the coil bobbin body 22, the magnet 5 and the magnet 5 are attached to the second step portion 9. The yoke plate 2 was fixed with an epoxy resin.

The center of the yoke plate 2 is squeezed into a projecting shape, and it is fitted into a central hole of the coil bobbin body 22 to face the diaphragm 3 and the armature 12 with a predetermined gap.

When an AC signal corresponding to an audio signal was applied to the coil 4 via the lead terminals 25 and 26 to the electromagnetic type sounding body of the present invention thus produced, the protruding portion of the yoke plate 2 The magnetic flux from the tip of 11 changed, the magnetic attraction force of the diaphragm 3 changed, the diaphragm 3 vibrated, and it was converted into desired acoustic vibration. This acoustic vibration is due to insert bobbin 23
It passed through between the magnets 5 and the magnets 5 and went out to the outside as audible sound through a plurality of sound emission holes provided in the yoke plate 2, whereby it was possible to function well as, for example, a telephone handset.

When a large number of electromagnetic type sounding bodies were produced in the same manner, no breakage of the coil winding occurred during assembly, and all showed good characteristics.

Further, when a vibration test was conducted on this electromagnetic type sounding body and then an AC signal was applied in the same manner, no distortion of the audio signal due to the slack of the coil winding was observed, and the electromagnetic wave of the present invention was confirmed. It was confirmed that the pattern sounder had high reliability.

The electromagnetic sounding body of the present invention could be suitably used as a receiver of a telephone, particularly a portable telephone, because it was thin and had good acoustic characteristics.

[0055]

As described above, according to the electromagnetic sounding body of the present invention, the outer peripheral coil winding is entwined with the protrusion formed on one side surface of the coil bobbin body and then laid out to the other main surface side. Therefore, slack of the coil winding does not occur in the thickness direction of the electromagnetic speaker, and a concave portion is provided between the pair of lead terminals on the other main surface side of the coil bobbin body, and the coil winding on the outer peripheral side is formed in the concave portion. Since the wires and the coil windings on the inner circumference side are three-dimensionally intersected with each other so as not to short-circuit with electrical insulation, the coil windings do not sag in the outer circumferential direction of the coil.

As a result, according to the electromagnetic type sounding body of the present invention, the slack of the coil winding can be surely prevented, and the distortion of the voice signal is generated or the sound is generated due to the contact of the slack coil winding with the diaphragm. It was possible to prevent disconnection of the coil winding when assembling the body, and to provide a highly reliable electromagnetic sounding body.

[Brief description of drawings]

FIG. 1 is a plan view showing a coil bobbin body in an embodiment of an electromagnetic speaker of the present invention.

FIG. 2 is a partially enlarged view of a coil bobbin body in an embodiment of the electromagnetic speaker of the present invention.

FIG. 3 is a partially enlarged perspective view of a coil bobbin body in an embodiment of the electromagnetic speaker of the present invention.

FIG. 4 is a sectional view showing a conventional electromagnetic speaker.

FIG. 5 is an exploded view showing a conventional electromagnetic speaker.

FIG. 6 is an external perspective view showing a conventional electromagnetic speaker.

FIG. 7 is a plan view showing a coil bobbin body in a conventional electromagnetic speaker.

[Explanation of symbols]

 1 Container 2 Yoke Plate 3 Vibration Plate 4 Coil 5 Magnet 8/9/10 Step 12 Armor (Metallic Magnetic Plate) 22 Coil Bobbin Body 25/26 Lead Terminal 27 Protrusion 28 Recess 29 Outer Coil Winding 30 Inner Coil Winding line

Claims (1)

[Claims] 1. A vibrating plate to which a magnetic metal plate is attached, a coil for vibrating the vibrating plate on one main surface, and a pair of lead terminals to which an electric signal from the outside is applied at an end portion in a container. The coil bobbin body and the yoke plate, which are respectively arranged, are sequentially arranged, and the outer circumference side coil winding drawn from the outer circumference of the coil is entangled with the protrusion formed on one side surface of the coil bobbin body and the other main surface The coil bobbin body is an electromagnetic type sounding body in which an inner circumference side coil winding drawn from the inner circumference is routed to the other main surface side through the other side surface and connected to the pair of lead terminals, respectively. A recess is provided between the pair of lead terminals on the other main surface side, and the outer peripheral coil winding and the inner peripheral coil winding intersect with each other with electrical insulation in the recess. Electromagnetic type Pronunciation body.