JP6654047B2 - Electroacoustic transducer and method of manufacturing the same - Google Patents

Description

  The present invention relates to an electro-acoustic transducer and a method for manufacturing the same. For example, in an electro-acoustic transducer for driving a planar diaphragm, a conductive line is easily and reliably drawn from a coil patterned on the diaphragm. The present invention relates to an electroacoustic transducer that can be made and a method for manufacturing the same.

  In an electroacoustic transducer in which a coil is formed on a planar diaphragm, since the entire diaphragm is driven, there is little unevenness in the frequency response of sound pressure due to divided vibration. On the planar diaphragm, a coil pattern is formed as a conductor on an insulating thin film such as a polymer film. The planar diaphragm is driven by the current flowing through the conductor. As the conductor, aluminum, which is lightweight and has high conductivity, like the ribbon microphone, is preferable.

  For example, Patent Document 1 discloses a diaphragm 50 in which a coil 52 is formed on a surface of an insulating thin film 51 made of, for example, polyimide as shown in FIG. The coil 52 is formed of a conductive material pattern in which bent portions 52a and linear portions 52b are formed alternately and continuously.

  When such a diaphragm is driven, a plurality of magnets 55 arranged opposite to the diaphragm 50 are used as shown in FIGS. 7A and 7B. Here, when a current is applied to the coil 52, a magnetic flux substantially parallel to the vibration surface of the diaphragm 50 is generated between the adjacent magnets 55. According to Fleming's left-hand rule, a force F is generated in a direction perpendicular to the vibration surface of the diaphragm 50. That is, the vibrating surface of the diaphragm 50 vibrates according to the electric signal to generate an acoustic signal.

JP 2000-345369 A

By the way, as shown in FIG. 6, a connection is made between a terminal pin (not shown) for drawing out a conductive wire from the conductor (coil 52) formed on the diaphragm 50 made of an insulating thin film and the conductor. Can not be soldered. This is because the soldering is performed at a high temperature, and the diaphragm 50 (insulating thin film) is deformed by heat.
On the other hand, by using a material having high heat resistance for the diaphragm 50, deformation of the diaphragm 50 can be suppressed. However, with such a material, there is a problem that the acoustic mechanical characteristics of the diaphragm 50 are limited, and sufficient performance cannot be obtained.
Although not shown, eyelets or a conductive adhesive is conventionally used to connect the conductor on the diaphragm 50 to the outer cord. However, these have a problem that electrical connection is obstructed, such as weather resistance and cracking when a stress is applied to the connection portion.

  The present invention has been made by paying attention to the above points, and in an electroacoustic transducer for driving a planar diaphragm, drawing of a conductive wire from a coil patterned on the diaphragm made of an insulating thin film. To provide an electro-acoustic transducer capable of easily and reliably performing the above-described steps, and a method for manufacturing the same.

To solve the problems described above, the electro-acoustic transducer according to the present invention, a flat surface shape of the diaphragm, and a coil formed on a surface of the vibration plate, at an end portion of the diaphragm, the coil on which is disposed a conductive elastic member that will be electrically connected to the coil, and the terminal pins which are arranged on the conductive elastic member, while being disposed in the conductive elastic member, the diaphragm comprising a fixed electrode are spaced a predetermined distance from, while being retained to the fixed pole, a magnet arranged opposite previously Kiko Lee Le, the height dimension of the conductive elastic member , the much larger than the height of the magnet, the terminal pin through the conductive elastic members are electrically connected to the coil, in particular with the features.
Incidentally, before Symbol terminal pins, Ru is sandwiched by said conductive elastic member, it is preferable.
Preferably, the conductive elastic member is a conductive cloth.

According to such a configuration, the conductive wire can be drawn out of the conductive elastic member without performing processing such as soldering or eyelet that causes heating to the diaphragm. Therefore, there is no deformation of the diaphragm, and it is possible to eliminate an adverse effect on driving of the diaphragm.
In addition, by using the conductive elastic member, a plurality of contacts can be used to connect to the pattern forming the coil, so that electrical connection can be reliably performed.
Furthermore, since the conductive elastic member holds the diaphragm, the end of the diaphragm can be mechanically braked by the elasticity and mechanical resistance of the conductive elastic member, and sound quality can be adjusted. .

Further, a method of manufacturing an electroacoustic transducer according to the present invention, which has been made to solve the above-described problem, includes a step of forming a coil on a surface of a planar diaphragm, and a step of forming a coil on an end portion of the diaphragm. A step of electrically connecting the coil and the conductive elastic member to each other, and arranging a terminal pin on the conductive elastic member so that the terminal pin and the conductive elastic member And a step of electrically connecting a fixed pole for holding a magnet on the conductive elastic member, supporting the fixed pole by the conductive elastic member, and opposing the coil to the magnet. And arranging.

The step of forming a coil on a surface of the planar diaphragm, comprising the step of forming the coil on both sides of the diaphragm symmetrically, the conductive on the coil at the ends of the diaphragm The step of arranging an elastic member and electrically connecting the coil and the conductive elastic member includes a step of arranging the conductive elastic member on each of the coils formed on both surfaces of the diaphragm. The step of disposing the fixed pole holding the magnet on the conductive elastic member, supporting the fixed pole by the conductive elastic member, and disposing the magnet in opposition to the coil includes the step of: Arranging the fixed poles on each of the conductive elastic members arranged on both sides of the diaphragm, supporting each of the fixed poles with each of the conductive elastic members, and opposing each of the coils. magnet It is preferable to have a step of disposing respectively.

Further, by arranging the terminal pins to the conductive elastic member, the step of electrically connecting the conductive elastic member and the terminal pin, the conductive elastic member on the coil at the ends of the diaphragm Is arranged, and is preferably performed after the step of electrically connecting the coil and the conductive elastic member.
Alternatively, a terminal pin is disposed on the conductive elastic member, and instead of the step of electrically connecting the terminal pin and the conductive elastic member, a terminal pin is inserted into the conductive elastic member, A step of electrically connecting the terminal pin and the conductive elastic member may be performed.

  According to such a manufacturing method, the electro-acoustic transducer according to the present invention can be formed, and the above-described effects can be obtained.

  In an electroacoustic transducer that drives a planar diaphragm, it is possible to easily and reliably draw out a conductive wire from a coil patterned on the diaphragm made of an insulating thin film.

FIG. 1 is a plan view of a dynamic headphone element as an electroacoustic transducer according to the present invention. FIG. 2 is a cross-sectional view of the dynamic headphone element of FIG. FIG. 3A is a plan view of a diaphragm included in the dynamic headphone element of FIG. 1, and FIG. 3B is a cross-sectional view thereof. FIG. 4A is a plan view in which conductive cloths are arranged at both ends of the diaphragm shown in FIG. 3, and FIG. 4B is a cross-sectional view thereof. FIG. 5 is a cross-sectional view for explaining a method of assembling a dynamic headphone element as an electroacoustic transducer according to the present invention. FIG. 6 is a perspective view of a conventional planar diaphragm. 7A and 7B are cross-sectional views for explaining the principle for driving the diaphragm shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a dynamic headphone element which is an example of an electroacoustic transducer according to the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG.
As shown in FIG. 2, the dynamic headphone element 1 is preferably a push-pull type element. A dynamic headphone element 1 is formed by forming coils 3 and 4 made of a conductor pattern on both sides of a diaphragm 2 made of an insulating thin film, for example, a polymer film 2a. As a material for forming the conductor pattern, for example, aluminum is used. The coils 3 and 4 have the same pattern shape. More specifically, the coil 3 has a bent portion 3a and a straight portion 3b (4b) alternately as shown in a plan view of FIG. 3A and a cross-sectional view of FIG. Formed continuously. As shown in FIGS. 2 and 3B, the patterns of the coils 3 and 4 are arranged such that the positions of the linear portions 3b coincide with each other via the insulating thin film.

  As shown in FIG. 2, the diaphragm 2 is disposed so as to be sandwiched between two fixed poles 7 and 8. Acoustic holes 7a, 8a are formed in fixed poles 7, 8, and a plurality of straight rod-shaped magnets 5, 6 are held. A plurality of magnets 5 arranged above and opposed to the upper surface side of the diaphragm 2 correspond to the coils 3, and a plurality of magnets 6 arranged below and opposed to the lower surface side coil 4. Corresponds.

  Further, as shown in FIG. 2, the gap between the fixed poles 7, 8 and the diaphragm 2 is set to be at least larger than the height of the magnets 5, 6. Specifically, conductive cloths 10 and 11 (conductive elastic members) are disposed on the upper and lower surfaces of both ends of the diaphragm 2, and the fixed poles 7 and 8 are supported on the conductive cloths 10 and 11. You. That is, the height of the conductive cloths 10 and 11 is at least larger than the height of the magnets 5 and 6. As the conductive cloths 10 and 11, for example, a plurality of conductive cloth tapes that can be stuck with a conductive adhesive and have a predetermined thickness can be used.

Further, by disposing the conductive cloths 10 and 11 at both ends of the diaphragm 2, the patterns of the coils 3 and 4 on the diaphragm 2 and the conductive cloths 10 and 11 are electrically connected at a plurality of points. You.
Also, terminal pins 15, 16, 1 having a predetermined length are placed on the conductive cloths 10, 11.
7, 18 ( input terminals) are arranged. Since the conductive cloths 10 and 11 are conductive elastic members, the terminal pins 15, 16, 17 and 18 are sandwiched by the conductive cloths 10 and 11 so as to be buried and are electrically conductive with the terminal pins 15, 16, 17 and 18. The cloths 10 and 11 are electrically connected at a plurality of points.
That is, the coils 3, 4 on the diaphragm 2 and the corresponding terminal pins 15, 16, 17, 18 are electrically connected via the conductive cloths 10, 11.

According to the dynamic headphone element 1 configured as described above, signals to the coils 3 and 4 formed on the diaphragm 2 are input via the conductive cloths 10 and 11.
That is, regarding the electrical connection between the terminal pins 15, 16, 17, 18 which are conductive wires and the coils 3, 4 on the diaphragm 2, there is no need for soldering which causes heating or eyelet processing which may apply unnecessary force. Thus, the deformation of the diaphragm 2 is prevented.
Further, since the diaphragm 2 is held by the conductive cloths 10 and 11, a mechanical braking force is exerted on the ends of the diaphragm 2 by the elasticity and mechanical resistance of the conductive cloths 10 and 11.

Next, a method of manufacturing the dynamic headphone element (electroacoustic transducer) configured as described above will be described.
First, as shown in the plan view of FIG. 3A and the cross-sectional view of FIG. 3B, a conductor pattern made of, for example, aluminum is formed on the upper surface and the lower surface of the polymer film 2a, and the vibration provided with the coil 4 A plate 2 is obtained. The patterns of the coils 3 and 4 on the diaphragm 2 are formed to extend to both ends of the film as shown in FIG. 3A (only the coil 3 is shown).

Next, as shown in the plan view of FIG. 4A and the cross-sectional view of FIG. 4B, for example, tape-type conductive cloths 10 and 11 as conductive elastic members are provided on both surfaces of both ends of the diaphragm 2. And a plurality of sheets are stuck together so that the height is Specifically, the height of the conductive cloths 10 and 11 is formed to a predetermined dimension that is at least larger than the height dimension of the magnets 5 and 6.
Then, as shown in the cross-sectional view of FIG. 5, the terminal pins 15, 16, 17, and 18 are adhered to the conductive cloths 10 and 11 disposed on both ends of the diaphragm 2 by a conductive adhesive or the like.

A plurality of magnets 5 are arranged in parallel on the fixed pole 7 having a plurality of acoustic holes 7a. The fixed pole 7 and the diaphragm 2 are supported by the conductive cloth 10 and are assembled so that the magnet 5 and the coil 3 face each other.
On the other hand, a plurality of magnets 6 are also arranged in parallel on the fixed pole 8 in which the plurality of acoustic holes 8a are formed, and the magnet 6 and the coil 4 are assembled so that the magnets 6 and the coils 4 are opposed to each other like the fixed pole 7. The conductive cloths 10 and 11 and the fixed poles 7 and 8 are bonded by a conductive adhesive.
Thus, the diaphragm 2 is disposed so as to be sandwiched between the fixed poles 7 and 8 (magnets 5 and 6), and the dynamic headphone element 1 is manufactured.

As described above, according to the embodiment of the present invention, the conductive cloths 10 and 11 are attached to the diaphragm 2 made of the polymer film 2a on which the patterns of the coils 3 and 4 are formed, and The patterns of the coils 3 and 4 are electrically connected to the terminal pins 15, 16, 17, and 18. That is, the conductive wire can be drawn out without performing processing such as soldering or eyelet that causes heating that causes deformation of the diaphragm 2. Therefore, the diaphragm 2 is not deformed, and an adverse effect on the driving of the diaphragm 2 due to the deformation can be eliminated.
Further, by using the conductive cloths 10 and 11, it is possible to connect the coils 3 and 4 to the pattern with a plurality of contacts. Therefore, electrical connection is ensured.
Further, since the conductive cloths 10 and 11 hold the diaphragm 2, the ends of the diaphragm 2 can be mechanically braked by the elasticity and mechanical resistance of the conductive cloths 10 and 11, so that sound quality can be adjusted. It is possible to do.

  In the above-described embodiment, the conductive elastic member has been described using a conductive cloth as an example. However, the present invention is not limited to this example. Other members may be used as long as they are conductive elastic members. That is, if the elastic member has conductivity, it can be connected to the patterns 3 and 4 on the diaphragm 2 by a plurality of contacts. Therefore, electrical connection can be reliably performed.

In the above-described embodiment, the so-called push-pull configuration in which the patterns of the coils 3 and 4 are formed on both sides of the diaphragm 2 and the magnets 5 and 6 are arranged to face each other. Is not limited to that form.
For example, the present invention can be applied to a configuration in which a coil pattern is formed only on one surface of the conductive thin film 2a, and a magnet is disposed only on one surface side.

  In the above-described embodiment, the terminal pins 15, 16, 17, and 18 are bonded to the conductive cloths 10 and 11 by a conductive adhesive. However, the present invention is not limited to this, and the terminal pins 15, 16, 17, and 18 may be inserted into the conductive cloths 10 and 11 to be electrically connected.

1 dynamic headphone element (electro-acoustic transducer)
2 Vibration plate 2a Insulating thin film 3 Coil 3a Bending portion 3b Linear portion 4 Coil 5 Magnet 6 Magnet 7 Fixed pole 7a Sound hole 8 Fixed pole 8a Sound hole 10 Conductive cloth (conductive elastic member)
11 conductive cloth (conductive elastic member)
15 Terminal pins (output terminals)
16 Terminal pins (output terminals)
17 Terminal pin (output terminal)
18 Terminal pin (output terminal)

Claims (7)

A planar diaphragm,
A coil formed on the surface of the diaphragm,
At an end of the diaphragm, a conductive elastic member disposed on the coil and electrically connected to the coil;
A terminal pin disposed on the conductive elastic member;
A fixed pole arranged on the conductive elastic member and arranged at a predetermined interval from the diaphragm,
While being held by the fixed pole, a magnet arranged to face the coil,
With
The height dimension of the conductive elastic member is larger than the height dimension of the magnet,
The terminal pin is electrically connected to the coil via the conductive elastic member,
An electroacoustic transducer characterized by the above. The terminal pin is sandwiched by the conductive elastic member,
The electroacoustic transducer according to claim 1. The conductive elastic member is a conductive cloth,
An electroacoustic transducer according to claim 1. Forming a coil on the surface of the planar diaphragm,
Arranging a conductive elastic member on the coil at an end of the diaphragm, and electrically connecting the coil and the conductive elastic member;
Disposing a terminal pin on the conductive elastic member, and electrically connecting the terminal pin and the conductive elastic member;
A step of disposing a fixed pole for holding a magnet on the conductive elastic member, supporting the fixed pole by the conductive elastic member, and disposing the magnet opposite the coil;
including,
A method for manufacturing an electroacoustic transducer, comprising: It said step of forming a coil on the surface of the planar vibrating plate has a step of forming a coil symmetrically on both sides of the diaphragm,
The step of disposing the conductive elastic member on the coil at an end portion of the diaphragm and electrically connecting the coil and the conductive elastic member is performed on a coil formed on both surfaces of the diaphragm. Having a step of disposing the conductive elastic member on each of the
Arranging the fixed pole holding the magnet on the conductive elastic member, supporting the fixed pole by the conductive elastic member, and arranging the magnet to face the coil; The fixed poles are arranged on each of the conductive elastic members arranged on both sides of the magnet, and the fixed poles are supported by the conductive elastic members, respectively, and the magnets are respectively opposed to the coils. Having a step of arranging
A method for manufacturing an electroacoustic transducer according to claim 4. Disposing a terminal pin on the conductive elastic member, and electrically connecting the terminal pin and the conductive elastic member,
By arranging the conductive elastic member on the coil at the ends of the diaphragm are carried out with the conductive elastic member and the coil after the electrically connecting step,
A method for manufacturing an electroacoustic transducer according to claim 4. Disposing a terminal pin on the conductive elastic member, instead of the step of electrically connecting the terminal pin and the conductive elastic member,
Inserting a terminal pin into the conductive elastic member, and performing a step of electrically connecting the terminal pin and the conductive elastic member,
A method for manufacturing an electroacoustic transducer according to claim 4.

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