JP2001169388A - Electroacoustic transducer and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electroacoustic transducer and its manufacturing method where the assembling of the electroacoustic transducer can be simplified and an automatic machine with a high clock rate can be utilized for the assembling. SOLUTION: The electroacoustic transducer (1) is provided with a diaphragm (4) fitted to a hold ring (6) and a coil (5) that is fixed to the diaphragm (4) and has lead wires. The lead wires have a hold part (7) in an area of the hold ring (6) in common or individually and the hold part (7) is fixed to the hold ring (6).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electro-acoustic transducer and a method of manufacturing the same, and more particularly, to the structure and assembly of an electro-acoustic transducer based on the principle of electrodynamics.

[0002]

2. Description of the Related Art Acoustic transducers of this kind (such as microphones or loudspeakers) are nowadays used in a wide variety of applications, such as, for example, car telephones, dictation recorders, radio telephones, helmets for aviators and motorcycles. It is being used with increasing degree of miniaturization, with a diameter of only a few millimeters.

[0003] The diaphragm used at that time follows this trend. At present, in the above-mentioned fields of application, the vibrating plate is mainly formed from a flat raw material in a heated state by a father die or a mother die, and is partially formed. Are made of plastic films with a thickness of several microns, closed, and these are sometimes molded in plastic film forms.

[0004] The finished diaphragm generally has a central crowned area and a toroidal ring area radially outward of the central crowned area. In the transition region there is an area consisting of two regions which are substantially cylindrical and are arranged concentrically with each other and which transition at each other at the lower end, wherein the lower coupling region is It is annular and has an end surface with respect to the diaphragm axis, on which the end surface of the coil is bonded or otherwise bonded.

Since the coil is submerged in the ring-shaped slit of the magnet mechanism, when a movement occurs between the coil and the magnet mechanism, an electric current is induced in the coil conductor (microphone operation), and conversely, when an alternating current flows through the coil. The coil is excited and vibrates, then the diaphragm resonates and the transducer acts as a speaker.

[0006]

The coil conductor is usually withdrawn from the coil at two locations diametrically opposite each other,
Turned individually or, often together, by 90 ° from the point of withdrawal from the coil, exited substantially radially from the diaphragm area and passed through appropriate contact points. Such a structure is selected because the supply lead wire of the coil has a loop structure covering substantially 90 ° so that the rigidity of the coil wire does not change or affect the vibration mode of the diaphragm. This is to take into account.

As is evident from the above, handling brittle and weak components of this type is a delicate and difficult task, and is usually a bottleneck in manufacturing. The reason for this is that the assembly of the coil and the diaphragm and the subsequent attachment to the magnet mechanism and the casing, including the contact of the supply conductor, is a costly operation.

[0008] It is an object of the present invention to simplify such an assembly and to make available an automatic machine with a high clock rate for the assembly.

[0009]

In order to achieve the above object, an electric acoustic transducer of the present invention is configured as follows.

[0010] 1. An electroacoustic transducer comprising a diaphragm (4) attached to a retaining ring (6) and a coil (5) fixed to the diaphragm and having a supply conductor, wherein the supply conductor is provided with a retaining ring. In the region of (6), holding portions (7, 7 ') are provided in common or individually, and one or a plurality of holding portions (7, 7') are fixed to the holding ring (6). An electroacoustic transducer, characterized in that:

[0011] The supply conductor is electrically connected to the holding portion.

2. One or more holding parts (7, 7 ')
2. An electroacoustic transducer according to claim 1, wherein the transducer is made of an electrically insulating plastic and is arranged in a notch (12) of the retaining ring (6).

3. One or more holding parts (7, 7 ')
2. The electroacoustic transducer according to claim 1, wherein the electroacoustic transducer is made of an adhesive tape section which is an electrically insulating plastic film.

4. One or more holding parts (7, 7 ')
Has at least one electrical conductor, for example a contact (1
3. The electro-acoustic transducer of paragraph 1 or paragraph 2, characterized in that it comprises 3), the conductor being connected to one or more supply conductors.

[0015] 5. At least one holding part (7, 7 ')
Has a wing (16) projecting radially outwardly from the outer contour of the retaining ring at an end remote from its supply conductor. Sound transducer.

6. At least one holding part (7, 7 ')
6. The electro-acoustic transducer according to any one of claims 1 to 5, wherein the transducer is made of at least one of steel, copper, brass, and aluminum.

[7] Item 1. In the method for manufacturing an electroacoustic transducer according to any one of Items 1 to 6, before the coil (5) is fixed to the diaphragm (4), the supply conductor is connected to one or more holding portions (7). ), And a retaining ring (6) is assembled to the diaphragm (4).

[8] 8. The method according to claim 7, wherein the fixing of the coil (5) to the diaphragm (4) is performed simultaneously with the fixing of one or more holding parts (7) to the holding ring (6). Method.

According to the invention, the object is that the supply wire of the coil is already connected to at least one holding part in the course of the manufacture of the coil, and the diaphragm is connected to the holding ring in the course of its manufacture. This is achieved in that the ring has cutouts or through holes for the holding of one or more coil supply conductors.

In one embodiment of the invention, two holding parts are used, one for each supply line, these holding parts possibly being electrically conductive materials, preferably metals or metal alloys. For example, if they are made of steel, copper, brass or aluminum, and these holding parts are made of electrically conductive material, they should be spaced apart from each other in the holding ring for insulation. It is intended to have and be insulated from the magnet mechanism.

According to this measure, the diaphragm is connected to one part during the molding process or shortly thereafter, ie to a retaining ring, which facilitates the subsequent handling of the diaphragm, in particular the coil. To facilitate connection. The coil is provided with a holder in the area of its free supply lines, individually for each supply line or in common for both supply lines.

The holding part makes it possible to precisely position the supply line with respect to the holding ring of the diaphragm for subsequent mounting of the electro-acoustic transducer. For this purpose, the coil and the end face of the diaphragm mentioned at the beginning are glued together, and at the same time the holding part is inserted into the notch or opening of the holding ring provided for it, where friction joining,
By gluing or otherwise stopping, a unit that is mechanically stable and can be handled without problems is created.

The holding part can also make contact with the supply line, so that on the side of the holding part facing away from the diaphragm there is a suitable contact area for the supply line, or It is also possible for the conductors to be held only in the part or only to penetrate the holding part and for the contact of the conductor to be made later outside the core region of the electro-acoustic transducer.

In one form of the invention, the retaining ring comprises:
Since it has all the steps, stairs, shoulders, lugs, etc. necessary to receive or secure the cover of the electro-acoustic transducer and its bottom plate, etc., the electro-acoustic transducer The entire vessel is mounted around this retaining ring, and in some cases the retaining ring will still define said position when installing the completed electro-acoustic transducer. Thereby, the precise alignment of the individual parts in the device in which the electro-acoustic transducer is housed and of the entire transducer is greatly facilitated and at the same time improved.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an electroacoustic transducer 1 according to the present invention.
Is exploded along its axis 2 (FIG. 3) in exploded view. From top to bottom, the next part is visible. A cover 3, a diaphragm 4, a coil 5, a retaining ring 6, a retaining part 7, a magnet mechanism 8, a two-part bottom plate 9, two contact plates 10, and two contact springs 1.
It is one.

As can be seen by contrasting FIGS. 1 and 3, the holding part 7 is inserted into the notch 12 of the holding ring 6, at which point the holding ring 7 is rubbed, glued or clamped. It is held by a magnet mechanism 8 that enters inside.

Although the supply conductor of the coil 5 is so thin that it is not shown in FIGS. 1 to 3, it joins the holding part 7 on the upper side of the holding part 7 facing the coil 5.

In the example shown, the holding part 7 has two contact parts 13 on the supply side and the opposite side of the supply conductor (FIG. 5), so that these contact parts 13 do not come into contact with each other. Properly dimensioned.

In the example shown, the contact parts 13 of the holding part 7 are bent inward at right angles (FIG. 7), each partially covering the bottom area of the electro-acoustic transducer 1 of the invention. The two contact plates 10, 10 'are brought into contact with each other. Both contact plates 10, 10 '
Are separated from one another in the example shown by a spacing 14 providing isolation for insulation.

It is of course also possible to design the contact part 13 so that it can be used directly for contacting the electro-acoustic transducer 1, for example, by spring action against a corresponding contact surface of the device in which the transducer is housed. This is done by surrounding the contact portion as described above. Another possibility is, for example, that the contact can be inserted into a spring-fitting cutout of the device.

As can be seen from FIGS. 7 and 1, the electrical connection between the two contact plates 10, 10 'is already fixed at one end to a device (not shown) in which the electroacoustic transducer 1 according to the invention is housed. This is done by contacting the spring 11 that is present.
The entire transducer can thus be inserted into the notch provided for it and at the same time be brought into contact. Here, a suitable positioning lug or groove may be provided on the retaining ring 6 to reach an accurate contact.

In the example shown, the cover 3 is also fitted to the retaining ring 6 by elastic frictional bonding, but the cover 3 can of course be bonded to the retaining ring 6.

Next, another embodiment having two electrically conductive holding portions 7 'will be described below with reference to FIG.
This will be described with reference to FIG.

The folded shape of the two holding parts 7 ′ inserted into the corresponding grooves or notches of the holding ring 6 can be seen in the drawing. This can be seen particularly clearly in FIG.

From FIG. 10, it is possible to know the space 17 with the magnet mechanism 8 which can be replaced with an insulator or supplement the insulation, and the shape of the contact surface facing down the holding portion 7 '. . As shown in FIG. 9, the contact surface (contact terminal) has a part
Protruding from the outer contour of the device, where contact is made with a device not shown.

Naturally, it is not necessary for the holding part 7 ′ to have a size, as is clearly shown in FIG. 8, and the holding part 7 ′ can either contact or assemble on the holding ring 6 or its seating. In order to simplify or improve the above, a tongue or the like may be provided. Also in this example, the supply lead wire is thin, and the contact with the holding portion 7 'is not shown for the sake of clarity.

As is clear from the above description, according to the present invention, each part to be assembled can be handled without any serious problems despite its small size and brittleness. The harmony between the retaining ring 6 and the retaining part 7 is not only achieved in the illustrated embodiment of the invention but also in that the coil 5 including the supply conductor is simply and accurately mounted on the diaphragm 4,
The subsequent assembly of the electroacoustic transducer 1 can also be automated to a high degree and performed at a high clock rate.

The invention is, of course, not limited to the examples shown, but can be varied in various ways. For example, the retaining ring 6 does not have to play the additional role shown and described here, and the retaining part 7 or the plurality of retaining parts 7 'need not have the illustrated shape.

It is possible for each of the two supply conductors to have its own holding part 7 ′, which holding part is not necessarily configured to be electrically conductive, but rather has a conductor. The other parts are made of electrically insulated material. At this time, if the (respective) holding parts are appropriately tapered, a sufficiently firm fixation can be achieved by friction welding,
In this case, depending on the situation, the connection is further reinforced by bonding. Of course, both holding parts may be in contact with one another (provided for electrical insulation between the supply lines) or may be connected to one another.

The holding part 7 can have a variety of shapes and mechanical properties. For example, the holding part is made of a kind of adhesive tape, on which the supply conductor can be attached. At this time, the adhesive tape may be closed as a whole in a ring shape, and may be wrapped around the entire circumference inside the holding ring 6. Notch 1 of retaining ring 6
2 in this case simply over a corresponding circumferential area,
Increase the internal radius according to the thickness of the adhesive tape. When attaching both supply conductors to the common holding part 7, care must be taken to keep them electrically insulated from each other. For this purpose, the holding part 7 is made of an electrically insulating material or is connected to the holding part 7 in such a manner that at least one of the conductors is insulated. At this time, whether the holding portion 7 is considered to be insulated as a whole or the insulated connection is considered to be the second holding portion may be either from the viewpoint of the present invention.

Of course, other forms are conceivable, but the important point is that when the coil 5 is assembled to the diaphragm 4, the supply wire of the coil 5 is already connected to the holding portion 7, and at that point the diaphragm 4 is The only difference is that the retaining ring 6 is already provided.

It is obvious that the present invention is not limited to the above-described embodiment, and that various changes can be made within the scope of the technical idea.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electro-acoustic transducer according to the invention, broken down in an exploded view along the transducer axis.

FIG. 2 is a plan view showing the electro-acoustic transducer of FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a view showing the holding unit according to the present invention from four angles, where A is a plan view, B is a front view, C is a side view, and D is a bottom view.

FIG. 6 is a view showing the retaining ring according to the present invention from three angles, where A is a bottom view, B is a cross-sectional view taken along the line cc, and C is a plan view.

FIG. 7 is a bottom view showing the electroacoustic transducer of FIG. 1;

FIG. 8 is an exploded perspective view showing another embodiment.

FIG. 9 is a sectional view of FIG. 8;

FIG. 10 is a sectional view of a portion different from FIG. 9 in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electroacoustic transducer 3 Cover 4 Diaphragm 5 Coil 6 Retaining ring 7 Retaining part 8 Magnet mechanism 9 Bottom plate 10 Contact plate 11 Contact spring 12 Notch

Claims (8)

[Claims] 1. An electroacoustic transducer comprising: a diaphragm (4) mounted on a retaining ring (6); and a coil (5) fixed to the diaphragm and having a supply wire. The supply conductors have holding parts (7, 7 ') in the area of the retaining ring (6), or individually,
An electro-acoustic transducer, characterized in that one or more holding parts (7, 7 ') are fixed to a holding ring (6). 2. One or more holding parts (7, 7 ') are made of electrically insulating plastic and are arranged in notches (12) of the holding ring (6). The electroacoustic transducer according to claim 1, wherein 3. The electrical device according to claim 1, wherein the one or more holding parts (7, 7 ') are made of adhesive tape sections, which are electrically insulating plastic films. Sound transducer. 4. One or more holding parts (7, 7 ') are provided with at least one electrical conductor, for example a contact part (13).
3. An electroacoustic transducer according to claim 1, wherein the conductor is connected to one or more supply conductors. 5. At least one holding part (7, 7 ') has at its end remote from the supply line a wing (16) projecting radially outward from the outer contour of the holding ring. An electroacoustic transducer according to any one of claims 1 to 4, characterized in that: 6. The method according to claim 1, wherein at least one of the holding portions is made of at least one of steel, copper, brass and aluminum. An electroacoustic transducer as described. 7. A method for manufacturing an electro-acoustic transducer according to claim 1, wherein the coil (5) is provided.
Before fixing to the diaphragm (4), the supply conductor is connected to one or more holding parts (7) and the holding ring (6) is assembled to the diaphragm (4). However, the manufacturing method. 8. The fixing of the coil (5) to the diaphragm (4),
The method according to claim 7, characterized in that it is carried out simultaneously with the fixing of one or more holding parts (7) to the holding ring (6).