JP2000059889A - Electroacoustic transducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic speaker and a magnetic earphone where the weight of a vibrating plate is reduced, an excellent high frequency sound characteristic is obtained, and a reproduced sound is obtained without causing undesired distortion when vibration amplitude of the plate is increased. SOLUTION: The transducer is provided with a magnetic vibration plate 22 and a drive section 16 that receives a drive current based on a voice signal and acts magnetic force changing in correspondence to the voice signal on the magnetic vibration plate 22 to vibrate the magnetic vibration plate 22, and the magnetic vibration plate 22 has a thin plate or a thin film base and a magnetic thin film layer coated on the base.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The invention described in the claims of the present application comprises a plate-shaped vibrating member and a drive unit for vibrating the plate-shaped vibrating member according to an audio signal, and emits a reproduced sound based on the audio signal. The present invention relates to an electroacoustic transducer.

[0002]

2. Description of the Related Art An electroacoustic transducer typified by various kinds of speakers or earphones is provided with a plate-shaped vibration member having a cone shape or a flat plate shape, and the plate-shaped vibration member is based on an audio signal. It is driven by the drive unit to which the drive current is supplied, and generates vibration corresponding to the audio signal, thereby generating a reproduced sound corresponding to the audio signal. Such an electro-acoustic transducer employs several different driving methods for driving the plate-shaped vibration member by the driving unit to generate vibration according to the audio signal. Are classified into movable coil type and magnetic type.

Under such circumstances, a magnetic type electroacoustic transducer has a conical or flat plate-shaped vibrating member, for example, in which a magnetic material is disposed at the center thereof. Alternatively, there is provided a drive unit which is formed entirely of a thin plate-shaped magnetic body and has a fixed coil to which a drive current based on an audio signal is supplied. Then, the driving unit supplies a driving current based on the audio signal to the coil, and the magnetic signal disposed on the plate-shaped vibrating member or the thin plate-shaped magnetic material forming the plate-shaped vibrating member is converted into the audio signal. A magnetic force that changes in response to the force acts on the plate-like vibrating member, whereby the entire plate-shaped vibrating member is brought into a state of generating vibration corresponding to the audio signal, and emits a reproduced sound.

[0004] According to the principle of operation of such a magnetic type electroacoustic transducer, good efficiency can be obtained and power consumption can be made relatively small. Therefore, adoption from such a viewpoint is attempted. I have.

[0005]

As described above, in a magnetic type electro-acoustic transducer, for example, a magnetic type speaker, a magnetic type earphone and the like,
A plate-shaped vibrating member that generates vibration according to the audio signal under the action of the magnetic force that changes according to the audio signal from the driving unit,
For example, it is assumed that a magnetic material is arranged in the center portion, or that the whole is formed by a thin plate-like magnetic material, and usually, since the magnetic material has a relatively large mass,
The weight tends to be relatively large as compared with a plate-shaped vibrating member in which another magnetic body is not provided or a whole of which is formed of a non-magnetic body. The plate-shaped vibration member that tends to have a relatively large weight as described above is
High-frequency vibration characteristics are not considered to be good, and therefore, it may be difficult for a magnetic speaker, a magnetic earphone, and the like to obtain good high-frequency characteristics.

In a magnetic speaker, when the amplitude of the plate-like vibration member is increased in order to obtain a relatively large sound output, the amount of the diaphragm driving force component that is not proportional to the driving current becomes remarkable. As a result, the vibration characteristics are deteriorated, and for example, there is a problem that the reproduced sound under the condition that the vibration amplitude is large causes undesired distortion. Furthermore, when the area size of the plate-shaped vibration member is increased to obtain a relatively large sound output, the weight of the plate-shaped vibration member increases remarkably with the increase in the area size, and the vibration characteristics deteriorate. And, for example,
There is a problem that efficiency is reduced and frequency characteristics are deteriorated. Therefore, the conventional magnetic speaker
It is not suitable for use as a device for obtaining relatively loud reproduced sounds.

In view of the above, the invention described in the claims of the present application provides a plate-shaped vibrating member and a driving unit that drives the plate-shaped vibrating member by applying a magnetic force that changes according to an audio signal. In the magnetic type provided with the plate-shaped vibrating member, the weight of the plate-shaped vibrating member is reduced, and the vibration characteristics, particularly, the high-frequency vibration characteristics are improved, and therefore, excellent high-frequency characteristics are obtained. In addition, the present invention provides an electro-acoustic transducer capable of forming a device that can obtain a relatively large reproduced sound without undesired distortion because the diaphragm area of the plate-shaped vibrating member can be large.

[0008]

An electroacoustic transducer according to any one of the first to tenth aspects of the present invention includes a plate-shaped magnetic vibration member, A drive unit for supplying a drive current based on the signal, thereby applying a magnetic force that changes in accordance with the audio signal to the magnetic vibration member to vibrate the magnetic vibration member, wherein the magnetic vibration member is a thin plate or a thin film. And a magnetic thin film layer adhered to the substrate.

In particular, in the electroacoustic transducer according to the invention described in claim 9 or 10 in the claims of the present application, a plurality of driving units are arranged for one magnetic vibration member, and the plurality of driving units are arranged. The driving units cooperate to vibrate one magnetic vibrating member. For example, the driving current supplied to each of the plurality of driving units is based on a plurality of different audio signals.

In the electroacoustic transducer according to any one of the first to tenth aspects of the present invention having the structure described above,
A plate-shaped magnetic vibrating member that vibrates under the action of a magnetic force that changes in response to an audio signal from a driving unit is made up of a thin plate or thin film base and a magnetic thin film layer adhered to the base. By being included, the thickness is reduced and the weight is significantly reduced while exhibiting magnetism. In addition, even when the overall size of the magnetic vibration member is relatively large, the increase in weight due to the increase in size is suppressed, and the magnetic vibration member is relatively light. Further, even if the magnetic vibrating member is further arranged on another vibrating member as required, the overall weight is significantly reduced.

Therefore, the magnetic vibrating member in the electroacoustic transducer according to any one of the first to tenth aspects of the present invention changes according to the audio signal from the drive unit. Vibration characteristics, particularly high-frequency vibration characteristics, are considered to be good when vibrating under the action of a magnetic force. Therefore, the electroacoustic transducer according to any one of claims 1 to 10 in the claims of the present application provides excellent high-frequency characteristics and vibration amplitude of the plate-shaped vibration member. Can be obtained without accompanying undesired distortion, and can be adapted for use as a device for obtaining a relatively large reproduced sound.

Particularly, in the electroacoustic transducer according to the ninth or tenth aspect of the present invention, a plurality of driving units are provided for one magnetic vibration member. , The plurality of driving units are, for example,
A drive current based on a plurality of different audio signals is supplied, and cooperates to vibrate the magnetic vibration member. At this time, the magnetic vibrating member has a thin plate or thin film base and a magnetic thin film layer adhered to the base, so that the overall size is relatively large. In this case as well, the increase in weight due to the increase in size is suppressed and the weight is relatively light, so that, for example, sounds based on a plurality of different audio signals can be faithfully reproduced with excellent high-frequency characteristics. Will be done. Further, the electroacoustic transducer according to the ninth or tenth aspect of the present invention is suitable for constituting a relatively large-scale sound reproducing apparatus.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of an electroacoustic transducer according to the invention described in any one of claims 1 to 6 of the present application. Of the handset described above, a magnetic speaker built in the receiver section is formed.

In the example shown in FIG. 1, in the receiver 10 of the handset provided in the telephone,
The magnetic pole piece 11, the annular coil 12 provided around the magnetic pole piece 11, the annular magnet 13 surrounding the annular coil 12, and the magnetic pole piece 11, the annular coil 12, and the annular magnet 13 are supported and face each other. A driving unit 16 including a pair of magnetic plates 14 and 15 is fixed to the case 17 and disposed. Both ends of the annular coil 12 are connected to a pair of drive current terminals 18 a and 18 b protruding outward from the case 17, and the drive current terminals 18 a and 1
A drive current based on the audio signal is supplied through 8b.

A vibration member 20 having a plate shape formed in a cone shape and a frame portion 21 for supporting the vibration member 20 are arranged in the receiver 10. The vibration member 20 has a plate-shaped magnetic vibration member 22 attached to a central portion thereof, and a peripheral portion 20 </ b> A directly attached to the frame portion 21. The magnetic vibration member 22
The magnetic pole piece 11 included in the driving section 16 is opposed to and close to the end face of the magnetic pole piece 11 via a small gap.

A plate-shaped magnetic vibrating member 22 attached to the central portion of a cone-shaped plate-shaped vibrating member 20 has a thin plate-shaped base 30 as shown in FIG. A plate-like body having the layer 31 applied thereto, or
As shown in FIG. 3, it is formed of a plate-like body in which a magnetic thin film layer 31 is adhered to a thin-film base 32.

In the plate-like body shown in FIG. 2 in which the magnetic thin film layer 31 is adhered to the thin plate-like base 30, the thin plate-like base 30 is made of, for example, a resin thin plate or glass. The magnetic thin film layer 31 is formed by forming a magnetic thin layer on the surface of the base 30 using a technique such as chemical plating, vapor deposition, or sputtering. Alternatively, a magnetic thin film or a magnetic thin plate formed in advance is adhered to the surface of the base 30,
It is assumed to be adhered to the base 30. Then, the plate-like body shown in FIG.
Is extremely small in thickness, significantly reduced in weight, and has relatively large elasticity.

In the plate-like body shown in FIG. 3 in which the magnetic thin film layer 31 is adhered to the thin-film base 32, the thin-film base 32 is, for example, a resin film.
The magnetic thin film layer 31 is formed on a base 32 made of a resin film by using a technique such as chemical plating, vapor deposition, or sputtering.
By forming a magnetic layer on the surface of
A magnetic thin film or a magnetic thin plate formed in advance is adhered to the surface of the base 32 made of a resin film, so that the base is attached to the base 32. And FIG.
The entire plate including the base 32 and the magnetic thin film layer 31 has an extremely small thickness, is significantly reduced in weight, and has a relatively large elasticity. You.

Accordingly, the magnetic vibrating member 22 formed of a plate as shown in FIG. 2 or FIG.
The high-frequency vibration characteristics are good.

Under these circumstances, when the driving current based on the audio signal is supplied to the annular coil 12 included in the driving unit 16 through the driving current terminals 18a and 18b, the driving unit 16 responds to the audio signal. The magnetic force that changes by the change is applied to the magnetic vibration member 22 attached to the central portion of the vibration member 20 to vibrate the magnetic vibration member 22 and the vibration member 20 according to the audio signal. Thereby, a reproduced sound corresponding to the audio signal is emitted from the vibration member 20.

At this time, the magnetic vibrating member 20 is formed by attaching a magnetic thin film layer 31 to a thin base 30 or a thin base 32 as shown in FIG. 2 or FIG. Therefore, the weight is reduced, and the vibration characteristics, particularly, the high-frequency vibration characteristics are improved.
Lighter weight with relatively small dimensions will suffice. Therefore, the vibrating member 20 and the magnetic vibrating member 22 attached to the vibrating member 20 are reduced in thickness and significantly reduced in weight, and even when the overall size is relatively large, The increase in weight due to the increase in
It is relatively lightweight.

Accordingly, the example shown in FIG. 1 having such a vibrating member 20 and the magnetic vibrating member 22 attached to the vibrating member 20 can obtain excellent high-pitched sound characteristics and have a large vibration amplitude of the plate-shaped vibrating member. The reproduced sound can be obtained without undesired distortion.

The above-described example shown in FIG. 1 includes a vibrating member 20 having a plate shape formed in a cone shape and a magnetic vibrating member 22 attached thereto. Any one of claims 1 to 6,
Alternatively, in the electroacoustic transducer according to the seventh aspect of the present invention, the vibrating member 20 having a plate shape formed in a cone shape provided in the example shown in FIG. Instead of the plate-shaped magnetic vibration member 22,
A flat plate-shaped magnetic vibration member may be provided. Each of A, B and C in FIG. 4 and A, B and C in FIG.
Are each provided with a magnetic vibrating member having a flat plate shape, and the electric power according to any one of claims 1 to 6 or the invention according to claim 7 in the claims of the present application. An example of an acoustic conversion device is schematically shown.

The examples shown in FIGS. 4A, 4B and 4C respectively are:
In each case, the magnetic pole piece 5
1, annular coil 52 provided around magnetic pole piece 51, annular magnet 5 surrounding annular coil 52
3, and a drive unit 56 including a magnetic pole piece 51, a magnetic plate 54 for supporting the annular coil 52 and the annular magnet 53 is fixedly arranged. Both ends of the annular coil 52 are connected to a pair of drive current terminals 55 a and 55 b protruding outward from the frame portion 50.
A driving current based on the audio signal is supplied through 5a and 55b.

The drive unit 5 is provided by the frame unit 50.
6, a flat plate-shaped magnetic vibrating member 57 disposed so as to cover the magnetic vibrating member 6 is supported.
A is directly fixed to the end face of the frame part 50.

The flat plate-shaped magnetic vibration member 57 also has
As shown in FIG. 2, a thin substrate 3 made of a resin thin plate, a glass thin plate, a ceramic thin plate, or the like.
In FIG. 3, a magnetic layer is formed on the surface of the substrate 30 by using a method such as chemical plating, vapor deposition, or sputtering. A magnetic layer is formed on the surface of the base 32 by using a technique such as chemical plating, vapor deposition, or sputtering on a thin-film base 32 as a resin film, as shown in FIG. It is formed by a plate-like body on which the body thin film layer 31 is adhered.

In the example shown in FIG. 4A, the length of the annular magnet 53 is larger than the length of the magnetic pole piece 51, and one end surface of the annular magnet 53 has a flat plate-like magnetic vibration member 57. Is in contact with When the magnetic vibrating member 57 vibrates, a portion of the magnetic vibrating member 57 where one end surface of the annular magnet 53 abuts forms a "node" of vibration. Further, in the example of FIG. 4B, the length of the magnetic pole piece 51 is larger than the length of the annular magnet 53, and one end surface of the magnetic pole piece 51 contacts the flat plate-shaped magnetic vibration member 57. In contact. When the magnetic vibrating member 57 vibrates, a portion of the magnetic vibrating member 57 where one end surface of the magnetic pole piece 51 abuts forms a “node” of vibration. Further, in the example of FIG. 4C, the length of the magnetic pole piece 51 is substantially equal to the length of the annular magnet 53, and one end surface of the magnetic pole piece 51 and one end surface of the annular magnet 53 are both flat. It is not in contact with the magnetic vibration member 57.

In the example shown in FIGS. 4A, 4B and 4C, the driving current based on the audio signal is supplied to the annular coil 52 included in the driving section 56 through the driving current terminals 55a and 55b. Is supplied, the driving unit 56
Applies a magnetic force that changes according to an audio signal to a magnetic vibrating member 57 having a flat plate shape to vibrate the magnetic vibrating member 57 according to an audio signal. Thereby, the magnetic vibration member 5
7, a reproduction sound corresponding to the audio signal is emitted.

The examples shown in FIGS. 5A, 5B and 5C are also:
In each case, the magnetic pole piece 5
1, annular coil 52 provided around magnetic pole piece 51, annular magnet 5 surrounding annular coil 52
3, and a drive unit 56 including a magnetic pole piece 51, a magnetic plate 54 for supporting the annular coil 52 and the annular magnet 53 is fixedly arranged. Both ends of the annular coil 52 are connected to a pair of drive current terminals 55 a and 55 b protruding outward from the frame portion 50.
A driving current based on the audio signal is supplied through 5a and 55b.

The drive unit 5 is provided by the frame unit 50.
6, a flat plate-shaped magnetic vibration member 58 disposed to cover the magnetic vibration member 58 is supported.
8A, the frame portion 50 with the annular elastic member 59 interposed therebetween.
It is attached to the end face.

The flat plate-shaped magnetic vibration member 58 is
As shown in FIG. 2, a thin substrate 3 made of a resin thin plate, a glass thin plate, a ceramic thin plate, or the like.
0, a magnetic material layer is formed on the surface of the substrate 30 by using a technique such as chemical plating, vapor deposition, or sputtering, thereby forming a plate-like body on which the magnetic material thin film layer 31 is adhered. It is said.

In the example shown in FIG. 5A, the length of the annular magnet 53 is larger than the length of the magnetic pole piece 51, and one end surface of the annular magnet 53 is in contact with a flat plate-shaped magnetic vibration member 58. In contact. When the magnetic vibration member 58 vibrates, a portion of the magnetic vibration member 58 where one end surface of the annular magnet 53 abuts forms a “node” of vibration. Further, in the example of FIG. 5B, the length of the magnetic pole piece 51 is larger than the length of the annular magnet 53, and one end face of the magnetic pole piece 51 is in contact with the flat plate-shaped magnetic vibration member 58. In contact. Magnetic vibration member 5
When the vibrating member 8 vibrates, a portion of the magnetic vibrating member 58 where one end surface of the magnetic pole piece 51 abuts forms a "node" of vibration. Further, in the example of C in FIG.
The length of the magnetic pole piece 51 is substantially equal to the length of the annular magnet 53, and neither the one end face of the magnetic pole piece 51 nor the one end face of the annular magnet 53 is in contact with the flat plate-shaped magnetic vibrating member 58.

In the example shown in FIGS. 5A, 5B and 5C, the driving current based on the audio signal is supplied to the annular coil 52 included in the driving section 56 through the driving current terminals 55a and 55b. Is supplied, the driving unit 56
Causes the magnetic vibrating member 58 to vibrate according to the audio signal by applying a magnetic force that changes in accordance with the audio signal to the magnetic vibrating member 58 having a flat shape. Thereby, the magnetic vibration member 5
8 reproduces a reproduction sound according to the audio signal.

In the examples shown in FIGS. 4A, 4B, and 5C and FIGS. 5A, 5B, and 5C, respectively,
The magnetic vibrating member 57 or 58 is formed by a plate-like body as shown in FIG. 2 or FIG.
The magnetic thin film layer 31 is applied to the thin plate-like base 30 or the thin-film base 32, so that the weight is reduced, and the vibration characteristics, especially the high frequency vibration characteristics, are excellent. It is assumed. Therefore, the examples shown in FIGS. 4A, 4B, and 5C and FIGS. 5A, 5B, and 5C each having such a magnetic vibration member 57 or 58 can obtain excellent high-pitched sound characteristics, By increasing the diaphragm area of the vibrating member, a relatively large reproduced sound can be obtained without undesired distortion.

FIG. 6 shows another example of an electroacoustic transducer according to the invention described in any one of claims 1 to 6 in the claims of the present application. It is supposed to form.

In the example shown in FIG. 6, a magnetic pole piece 61, an annular coil 62 provided around the magnetic pole piece 61, an annular magnet 63 surrounding the annular coil 62, and a magnetic pole piece 61, Annular coil 6
2 and a magnetic plate 64 supporting the annular magnet 63
Is fixed to the frame 66 and is covered with the mold case 67. Both ends of the annular coil 62 are connected to a pair of drive current terminals 68a and 68b disposed in the mold case 67, and the annular coil 62 receives a drive current based on an audio signal through the drive current terminals 68a and 68b. Supplied.

A flat plate-shaped magnetic vibrating member 70 is supported by the frame portion 66.
Reference numeral 0 denotes a state in which the peripheral portion 70 </ b> A is directly attached to the frame portion 66, and is disposed so as to face and close to the driving portion 65. The flat plate-shaped magnetic vibrating member 70 supported by the frame 66 is covered by a sound hole mold case 72 provided with a sound hole 71.

The flat plate-shaped magnetic vibration member 70 is
As shown in FIG. 2 described above, a technique such as chemical plating, vapor deposition, or sputtering is used on a thin substrate 30 such as a resin thin plate, a glass thin plate, or a ceramic thin plate. Then, a magnetic layer is formed on the surface of the base 30 to form a plate-like body having the magnetic thin film layer 31 adhered thereto, or a resin film as shown in FIG. 3, for example. A chemical plating,
The magnetic layer is formed on the surface of the base 32 by using a technique such as vapor deposition or sputtering, so that the magnetic layer is formed by a plate-shaped body on which the magnetic thin film layer 31 is adhered. Accordingly, the weight of the flat plate-shaped magnetic vibration member 70 is reduced, and the vibration characteristics, particularly, the high-frequency vibration characteristics are improved.

Under these circumstances, when the driving current based on the audio signal is supplied to the annular coil 62 included in the driving unit 65 through the driving current terminals 68a and 68b, the driving unit 65 responds to the audio signal. Magnetic force acting on the magnetic vibrating member 70 having a flat shape,
0 is vibrated according to the audio signal. Thereby, a reproduced sound corresponding to the audio signal is emitted from the magnetic vibration member 70.

At this time, the plate-shaped magnetic vibrating member 70
Is formed by a plate-shaped body as shown in FIG. 2 or FIG. 3, that is, formed by attaching a magnetic thin film layer 31 to a thin base 30 or a thin base 32. Since the weight is reduced and the vibration characteristics, especially the high frequency vibration characteristics, are improved,
The example shown in FIG. 6 having such a plate-shaped magnetic vibrating member 70 can obtain excellent high-frequency characteristics and increase the diaphragm area of the plate-shaped vibrating member to produce a relatively large reproduced sound. It can be obtained without undesired distortion.

FIG. 7 shows another example of the electroacoustic transducer according to the invention described in claim 7 of the present application. This example also forms an earphone.

Also in the example shown in FIG. 7, the magnetic pole piece 61, the annular coil 62 provided around the magnetic pole piece 61, the annular magnet 63 surrounding the annular coil 62, and the magnetic pole piece 61, Annular coil 6
2 and a magnetic plate 64 supporting the annular magnet 63
Is fixed to the frame 66 and is covered with the mold case 67. Both ends of the annular coil 12 are connected to a pair of drive current terminals 68a and 68b disposed in the mold case 67, and the annular coil 62 receives a drive current based on an audio signal through the drive current terminals 68a and 68b. Supplied.

A flat plate-shaped magnetic vibrating member 73 is supported by the frame 66, and the magnetic vibrating member 7
3 is attached to the frame portion 66 with the peripheral portion 73A interposed with the annular elastic member 74 interposed therebetween, and is arranged in a state of being opposed to the driving portion 65 in close proximity. The flat plate-shaped magnetic vibration member 73 supported by the frame portion 66 via the annular elastic member 74 is covered by a sound hole mold case 72 provided with a sound hole 71.

The flat plate-shaped magnetic vibrating member 73 is
As shown in FIG. 2 described above, it is formed of a plate-like body in which a magnetic thin film layer 31 is adhered to a thin plate-like base 30.

The example shown in FIG. 7 operates similarly to the example shown in FIG. 6, and the same operation and effect as the example shown in FIG. 1 can be obtained.

FIG. 8 shows an example of an electroacoustic transducer according to the invention described in claim 9 of the present application, in a state applied to a large-scale sound reproducing apparatus.

In the large-scale sound reproducing apparatus shown in FIG. 8, claim 9 or 1 in the claims of the present application.
0, a plurality of (n) drive current supply circuits CD1, CD2,..., CDn connected to the speaker 80 as an example of the electroacoustic transducer according to the invention described in FIG.
Are provided.

In the case of the speaker 80, the frame portion 81
, A plurality (n) of driving units D1, D2,.
Dn is fixedly arranged. Each of the driving units D1 to Dn includes a magnetic pole piece 82, an annular coil 83 provided around the magnetic pole piece 82, an annular magnet 84 surrounding the annular coil 83, and a magnetic pole piece 8.
2. It includes a magnetic plate 85 that supports the annular coil 83 and the annular magnet 84. Both ends of the annular coil 83 are connected to a pair of drive current terminals 86a and 86b protruding outward from the frame portion 81.

A magnetic vibrating member 90 having a flat plate shape is supported by the frame portion 81.
Reference numeral 0 denotes a state in which the peripheral portion 90A is directly attached to the end surface of the frame portion 81, and is disposed in a state of being in close proximity to each of the driving portions D1 to Dn. Accordingly, in the speaker 80, a plurality of (n) driving units D1 to Dn are arranged for one magnetic vibrating member 90 having a flat shape.

The flat plate-shaped magnetic vibration member 90 is
As shown in FIG. 2 described above, a technique such as chemical plating, vapor deposition, or sputtering is used on a thin substrate 30 such as a resin thin plate, a glass thin plate, or a ceramic thin plate. Then, a magnetic layer is formed on the surface of the base 30 to form a plate-like body having the magnetic thin film layer 31 adhered thereto, or a resin film as shown in FIG. 3, for example. A chemical plating,
The magnetic layer is formed on the surface of the base 32 by using a technique such as vapor deposition or sputtering, so that the magnetic layer is formed by a plate-shaped body on which the magnetic thin film layer 31 is adhered. Therefore, the magnetic vibrating member 90 having a flat plate shape is reduced in weight, and has good vibration characteristics, particularly high-frequency vibration characteristics, and a relatively large overall size. Also, the increase in weight due to the increase in size is suppressed, and the weight is relatively reduced.

Each of the drive current supply circuits CD1 to CDn has an audio signal input terminal 91 to which one of audio signals SA1, SA2,..., SAn is supplied, and an audio signal from the audio signal input terminal 91. Are provided, and a power amplifying unit 93 to which an output signal from the audio signal processing unit 92 is supplied. The pair of output terminals of the power amplifying section 93 are connected to the driving sections D1 to D1.
n pair of drive current terminals 86a and 86b in each of n.
Connected to each other.

The audio signal processing section 92 performs processing such as amplitude control and phase control on the audio signal supplied through the audio signal input terminal 91 to form an output signal, and supplies the output signal to the power amplification section 93. The power amplifying unit 93 performs power amplification on the output signal from the audio signal processing unit 92, and supplies a driving current corresponding to the audio signal supplied to the audio signal input terminal 91 to the annular coils 83 in each of the driving units D1 to Dn. Is supplied through a pair of drive current terminals 86a and 86b.

As a result, each of the driving units D1 to Dn
A magnetic force that changes in accordance with the audio signal supplied to the audio signal input terminal 91 in response to the drive current supplied to the annular coil 83 is applied to the magnetic vibration member 90 having a flat plate shape. Is vibrated according to the audio signal supplied to the audio signal input terminal 91. That is, the driving units D1 to D1
Dn cooperates to form a single plate-shaped magnetic vibrating member 90.
Will be vibrated. Thereby, the magnetic vibration member 9
0 to audio signals SA1, SA2,..., SAn supplied to a plurality (n) of audio signal input terminals 91, respectively.
The reproduction sound corresponding to is generated.

At this time, the plate-shaped magnetic vibration member 90
Is formed by a plate-like body as shown in FIG. 2 or FIG. 3, that is, a structure in which a magnetic thin film layer 31 is applied to a thin base 30 or a thin base 32. As a result, the weight is reduced, and the vibration characteristics, particularly, the high-frequency vibration characteristics are improved.
Even when the overall size is relatively large, the increase in weight due to the increase in size is suppressed, and the weight is relatively small. Therefore, the speaker 80 including the magnetic vibration member 90 is used.
In this case, excellent high-frequency characteristics can be obtained, and the diaphragm area of the plate-shaped vibration member is increased, so that a relatively large reproduced sound can be obtained without undesired distortion.

Under these circumstances, for example, the audio signals SA1, SA2,... Supplied to the audio signal input terminals 91 of the drive current supply circuits CD1 to CDn, respectively.
.., SAn are different from each other, whereby the driving current supplied to the annular coil 83 in each of the driving units D1 to Dn is different from the audio signal SA.
1, SA2,..., SAn. As a result, the flat plate-shaped magnetic vibrating member 90 allows
Different audio signals SA1, SA2,..., S
A composite sound based on An is reproduced faithfully with excellent high-frequency characteristics.

In the speaker 80 shown in FIG. 8, the magnetic vibrating member 90 has the peripheral portion 90A directly attached to the end surface of the frame portion 81. As shown in FIG. 2, a thin plate-shaped substrate 30 such as a resin thin plate, a glass thin plate, a ceramic thin plate, or the like is chemically plated,
When a magnetic layer is formed on the surface of the substrate 30 by using a technique such as vapor deposition or sputtering, and the magnetic layer is formed of a plate-like body having the magnetic thin film layer 31 adhered thereto, the peripheral portion thereof is formed. May be attached to the end face of the frame portion 81 via an annular elastic member.

In each of the above-described examples, each of the magnetic vibrating members 22, 57, 58, 70, 73, and 90 is a resin thin plate, a glass thin plate, a ceramic thin plate, or the like. A thin film-shaped substrate or a thin film-shaped substrate such as a resin film is coated with a magnetic thin film layer over the entire surface. In the electroacoustic transducer according to the invention described in claim 8 in the claims, the magnetic vibration member is a thin plate made of resin, a thin plate made of glass, a thin plate made of ceramic, or the like. Substrate, or a thin-film substrate made of, for example, a resin film, in which a portion where the magnetic thin film layer is attached and a portion where the magnetic thin film layer spreading around the portion is not attached are It is configured to have what it has.

[0058]

As is apparent from the above description, in the electroacoustic transducer according to any one of the first to tenth aspects of the present invention, the driving unit includes: A plate-shaped magnetic vibrating member that vibrates under the action of a magnetic force that changes in accordance with an audio signal of a substrate has a thin plate or thin film base and a magnetic thin film layer adhered to the base. As a result, the thickness is reduced and the weight is significantly reduced while exhibiting magnetism. And, even when such a magnetic vibration member has a relatively large overall size,
An increase in weight due to an increase in size is suppressed, and the weight is relatively reduced. Further, even if the magnetic vibrating member is further disposed on another vibrating member as needed, the increase in the overall weight is significantly reduced.

Accordingly, the magnetic vibrating member in the electroacoustic transducer according to any one of the first to tenth aspects of the present invention changes according to the audio signal from the drive unit. Vibration characteristics, particularly high-frequency vibration characteristics, are considered to be good when vibrating under the action of a magnetic force. Therefore, according to the electroacoustic transducer according to any one of the first to tenth aspects of the present invention, excellent high-frequency characteristics can be obtained, and the plate-like vibration can be obtained. It is possible to obtain a reproduced sound under the condition that the vibration amplitude of the member is large without causing undesired distortion, and furthermore, any one of claims 1 to 10 in the claims of the present application. The electro-acoustic transducer according to the described invention can be adapted for use as a device for obtaining a relatively large reproduced sound.

In particular, according to the electroacoustic transducer according to the ninth or tenth aspect of the present invention, for example, a sound based on a plurality of mutually different audio signals can be converted into an excellent treble sound. The electro-acoustic transducer according to the ninth or tenth aspect of the present invention constitutes a relatively large-scale sound reproducing apparatus. It is suitable for.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an electroacoustic transducer according to the invention described in any one of claims 1 to 6 in the claims of the present application.

FIG. 2 is a view showing an example of a plate-like body forming a magnetic vibration member provided in the electroacoustic transducer according to any one of claims 1 to 10 of the present application. It is a side view.

FIG. 3 shows another example of a plate-like body forming a magnetic vibration member provided in the electroacoustic transducer according to any one of the first to tenth aspects of the present invention. It is a partial side view shown.

FIG. 4 is a schematic diagram showing an example of an electroacoustic transducer according to any one of claims 1 to 6 in the claims of the present application, which is provided with a flat-plate-shaped magnetic vibration member. It is sectional drawing shown in FIG.

FIG. 5 is a cross-sectional view schematically showing another example of the electroacoustic transducer according to the invention described in claim 7 of the present application and having a flat-plate-shaped magnetic vibration member. .

FIG. 6 is a sectional view showing another example of the electroacoustic transducer according to the invention described in any one of claims 1 to 6 in the claims of the present application.

FIG. 7 is a cross-sectional view showing another example of the electroacoustic transducer according to the invention described in claim 7 of the present application.

FIG. 8 is a configuration diagram showing an example of an electroacoustic conversion device according to the invention described in claim 9 or 10 of the present application, in a state applied to a large-scale sound reproduction device.

[Explanation of symbols]

10 receiving unit, 11, 51, 61, 82 ... magnetic pole piece, 12, 52, 62, 83 ... annular coil, 13, 53, 63, 84 ... annular magnet, 1
4, 15, 54, 64, 85 ... magnetic plate, 1
6, 56, 65, D1 to Dn... Drive unit, 17.
Case, 18a, 18b, 55a, 55b, 68a, 6
8b, 86a, 86b... Drive current terminals, 22, 5
7, 58, 70, 73, 90: magnetic vibration member, 2
1, 50, 66, 81 ... frame part, 30, 32
..Base, 31 ... Magnetic thin film layer, 59, 74 ...
Annular elastic member, 67 ... Mold case, 72 ...
Sound hole mold case, 80 ... speaker, 91 ...
Audio signal input terminal, 92 ... audio signal processing unit, 93
..Power amplifiers, CD1 to CDn... Drive current supply circuits

Claims (10)

[Claims] 1. A magnetic vibrating member having a plate shape and a drive current based on an audio signal are supplied, whereby a magnetic force that changes in accordance with the audio signal is applied to the magnetic vibrating member to cause the magnetic vibrating member to move. An electroacoustic transducer, comprising: a driving unit that vibrates; and wherein the magnetic vibration member is configured to include a thin or thin substrate and a magnetic thin film layer adhered to the substrate. apparatus. 2. The electroacoustic transducer according to claim 1, wherein the magnetic vibrating member has a base made of a resin thin plate. 3. The electroacoustic transducer according to claim 1, wherein the magnetic vibrating member has a base made of a thin glass plate. 4. The electroacoustic transducer according to claim 1, wherein the magnetic vibrating member is made of a ceramic thin plate as a base. 5. The electroacoustic transducer according to claim 1, wherein the magnetic vibration member has a resin film as a base. 6. The electroacoustic device according to claim 1, further comprising a frame portion to which a peripheral portion of the magnetic vibration member is directly attached to support the magnetic vibration member. Conversion device. 7. The magnetic vibration member according to claim 1, further comprising a frame attached to a peripheral portion of the magnetic vibration member with another member interposed therebetween to support the magnetic vibration member. An electroacoustic transducer according to any one of the preceding claims. 8. A magnetic vibrating member comprising a base having a portion on which a magnetic thin film layer is not adhered around a portion on which a magnetic thin film layer is adhered.
An electroacoustic transducer according to any one of claims 1 to 7. 9. The method according to claim 1, wherein a plurality of driving units are provided for one magnetic vibration member, and the plurality of driving units cooperate to vibrate the one magnetic vibration member. Item 9. The electro-acoustic conversion device according to any one of items 8 to 8. 10. The electro-acoustic transducer according to claim 9, wherein the drive current supplied to each of the plurality of drive units is based on a plurality of different audio signals.