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JPH04105792

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DESCRIPTION JPH04105792
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for
example, an MFB (motional feedback) type speaker having a detection coil for detecting
mechanical vibration of a speaker diaphragm as an electric signal in a speaker apparatus of
various audio equipment such as radio cassettes It relates to an apparatus.
[0002]
2. Description of the Related Art In an example of an MFB type speaker device generally used
conventionally, a center shaft hole is provided in a yoke with a center pole of a drive coil side
magnetic circuit, and a yoke with a center pole of a detection coil side magnetic circuit. Similarly,
a central axis hole is provided, and the detection coil side magnetic circuit is mounted on the rear
of the drive coil side magnetic circuit with the same central axis, and the dome shaped cap
mounted on the speaker diaphragm and the detection coil side magnetic circuit There is a
configuration in which a detection coil of the circuit is connected with a connecting rod through
the central axis holes of the two magnetic circuits.
[0003]
In the speaker device of the above configuration, the vibration in the piston motion region of the
speaker diaphragm is transmitted to the detection coil through the cap and the connecting rod,
and the detection coil obtains a detection signal according to the magnitude of the vibration.
There is.
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[0004]
In another example of the MFB type speaker apparatus, an auxiliary frame is attached to the
main frame of the speaker in front of the speaker diaphragm, and a detection coil side magnetic
circuit is disposed on the drive coil side in the center of the auxiliary frame. There is a
configuration in which the detection coil is connected to the speaker diaphragm so as to be
identical to and opposed to the central axis of the circuit.
[0005]
In the speaker apparatus having the above configuration in which the detection coil side
magnetic circuit is disposed in front of the speaker diaphragm, the vibration of the piston motion
area of the speaker diaphragm is transmitted directly to the detection coil via the detection coil
bobbin etc. A detection signal corresponding to the magnitude of the vibration is obtained in the
coil.
[0006]
In the former MFB type speaker device of the above-mentioned conventional type, since the
detection coil side magnetic circuit is disposed at the rear of the drive coil side magnetic circuit,
the height of the speaker device unit is increased. And the connecting rod becomes long and the
vibration system also becomes heavy.
[0007]
Further, in the above-mentioned conventional MFB type loudspeaker apparatus, since the
detection coil side magnetic circuit is disposed in front of the loudspeaker diaphragm, there is a
disadvantage that the sound pressure frequency characteristic is adversely affected.
[0008]
SUMMARY OF THE INVENTION In the present invention, the center pole of the detection coil
side magnetic circuit yoke is substantially parallel to the center pole in the center axis hole
provided in the center pole of the drive coil side magnetic circuit yoke. This is an MFB-type
speaker device which is disposed in such a manner that the coils of both magnetic circuits are
connected by a connecting plate.
[0009]
In the MFB type speaker device according to the present invention, since the connection plate is
connected to the detection coil adjacent to the drive coil of the speaker diaphragm, the vibration
system is hardly affected. Get sound pressure frequency characteristics.
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[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The magnetic circuit of the MFB
type speaker device according to the present invention uses mechanical vibration of the drive
coil side magnetic circuit 1 for driving the speaker diaphragm and the speaker diaphragm as a
signal corresponding to the magnitude of the vibration. It comprises the detection coil side
magnetic circuit 2 to detect.
[0011]
The magnetic circuit 1 comprises an annular magnet 3, a disk-like plate 4 having a desired
central hole, and a yoke 7 integrated with a center pole 6 having a desired central axial hole 5.
The magnet 4 is held between the plate 4 and the yoke 7.
[0012]
The magnetic circuit 2 comprises an annular magnet 8, a yoke 7 of the magnetic circuit 1, and a
yoke 10 integrated with a center pole 9 having a diameter smaller than the inner diameter of the
central axial hole 5. The yoke 7 and the yoke 10 sandwich the magnet 8.
[0013]
Further, the tip of the center pole 6 of the magnetic circuit 1 and the tip of the center pole 9 of
the magnetic circuit 2 are arranged side by side so as to be substantially on the same plane, and
the magnetism of the magnetic circuit 1 is provided between the plate 4 and the center pole 6. A
gap 11 is formed, and a magnetic gap 12 of the magnetic circuit 2 is formed between the center
poles 6 and 9.
[0014]
A drive coil 14 wound around the drive bobbin 13 is disposed in the magnetic gap 11, and a
detection coil 16 wound around the detection bobbin 15 is disposed in the magnetic gap 12.
Therefore, the two bobbins 13 and 15 are disposed coaxially adjacent to each other.
[0015]
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The two bobbins 13 and 15 are connected by, for example, an annular or partially connecting
plate 18 at the tip end of the diaphragm 17 side.
[0016]
A speaker diaphragm 17 and a damper 20 are mounted between the main frame 19 and the
driving bobbin 13 as shown in FIG.
Reference numeral 21 is a cap.
[0017]
In the MFB type speaker device of the above configuration according to the present invention,
when an electric acoustic signal is input to the drive coil 14, the drive coil 14 is driven by the DC
magnetic field generated in the magnetic gap 11 of the drive coil side magnetic circuit 1. Moves
in the axial direction according to the magnitude of the signal, and the speaker diaphragm 17
vibrates.
[0018]
On the other hand, the movement of the drive coil 14 is interlocked with the detection coil 16 via
the connection plate 15, and the detection coil 16 moves in the DC magnetic field generated in
the magnetic gap 12 of the detection coil side magnetic circuit 2. Thus, the vibration of the
speaker diaphragm 17 is detected by the electric signal generated in the detection coil 16.
[0019]
In the MFB type speaker device according to the present invention, the detection coil 16 is
disposed in the yoke 7 with the center pole of the drive coil side magnetic circuit 1, and the yoke
7 of the drive coil side magnetic circuit 1 is used. Since a part of the detection side magnetic
circuit 2 is configured, the height of the speaker device unit can be lowered, and the detection
side magnetic circuit 2 is not disposed in front of the speaker diaphragm 17, so the sound
pressure frequency characteristics are adversely affected. Do not give
[0020]
Brief description of the drawings
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[0021]
1 is a cross-sectional view of the main part of the MFB type speaker device according to the
present invention.
[0022]
Explanation of sign
[0023]
DESCRIPTION OF SYMBOLS 1 Drive coil side magnetic circuit 2 Detection coil side magnetic
circuit 14 Drive coil 16 Detection coil 17 Speaker diaphragm 18 Connection plate
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