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JP2001119792

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2001119792
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
high-pitched speaker for use in audio equipment and the like.
[0002]
2. Description of the Related Art As high-frequency speakers of this type, various structures have
been proposed so far, but here, high-frequency speakers called ribbon tweeters will be described.
The ribbon tweeter is composed of a magnetic circuit that forms a direct current magnetic field
and a ribbon made of a conductive metal foil and held freely at both ends in the direct current
magnetic field, and the ribbon vibrates by applying a signal voltage to the ribbon. Sound waves
are emitted.
[0003]
The advantage of the ribbon tweeter is that it does not require the diaphragms that other types
of speakers require, and the equivalent of the coil in other types of speakers acts as a diaphragm,
thereby significantly reducing the weight of the speaker's vibration system And high frequency
bands can be reproduced.
[0004]
However, since the ribbon tweeter is a sheet of metal foil equivalent to a coil, its electrical
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resistance is extremely low, and impedance conversion is performed to achieve electrical
matching with the speaker drive circuit. Is essential, and parts such as transformers are required,
and the structure becomes complicated and the manufacturing cost increases, and a large
current flows in the thin metal foil, so that breakage due to melting of the metal foil is likely to
occur. There was a problem.
[0005]
The present invention has been made in view of the above-described problems, and an object
thereof is to provide a high sound speaker having a simple structure, easy manufacture, and high
durability.
[0006]
[Means for Solving the Problems] In order to achieve the above-mentioned object, the high-tone
speaker according to the present invention is characterized in that a band-shaped conductor film
is partially formed on the outer periphery of a fixed coil consisting of a conductor thin wire
whose surface is insulated. In the magnetic gap in which a direct current magnetic field is
formed, a double coil formed by winding so as not to be in close contact is disposed so that an
induced current flowing through the coil made of the conductor film is orthogonal to magnetic
lines of the direct current magnetic field A coil comprising the conductive film is vibrated by
applying a signal voltage to the coil.
[0007]
According to such a configuration, since the impedance can be set to any value by adjusting the
number of turns of the fixed coil, parts for impedance conversion become unnecessary.
Moreover, since the induction current which flows into the coil which consists of a conductor
film is not large, it is hard to damage.
[0008]
It is preferable that the coil made of the conductive film be a one-turn shorted coil whose both
ends are electrically shorted, because the electric resistance is reduced and the vibrating portion
is lightened.
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[0009]
Further, it is preferable to position the fixed coil at a predetermined position in the magnetic gap
and to hold a bobbin fixed at the predetermined position, since it becomes easy to attach the coil
to the magnetic circuit.
[0010]
In addition, it is preferable that the coil composed of the fixed coil and the conductor film is
formed in a substantially rectangular cross section so that the whole of the coil is positioned in a
substantially uniform magnetic field, since distortion is reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION Specific embodiments of the present
invention will be described below with reference to the drawings.
FIG. 1 is a side sectional view of a high sound speaker according to an embodiment of the present
invention, FIG. 2 is a cross sectional view taken along line A-A of FIG. 1, and FIG. 3 is a frequency
characteristic diagram of the high sound speaker of this embodiment.
[0012]
In FIGS. 1 and 2, reference numeral 1 denotes a double coil, and a fixed coil 2 formed in a
substantially rectangular shape in cross section and a substantially rectangular shape in a cross
section. It consists of a short coil 3 fixed so as to be in close contact with the side.
[0013]
The fixed coil 2 is formed by winding a conductor fine wire whose surface is subjected to
insulation processing multiple times, and the short coil 3 is a strip of aluminum foil, so that one
side thereof faces the outer peripheral portion of the fixed coil 1. It is formed by winding one
turn around the outer peripheral portion and joining both ends.
[0014]
A bobbin 4 for holding the fixed coil 2 is an elongated one having a substantially H-shaped cross
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section formed of resin, and is fitted in an elongated magnetic gap of a fixed width formed
between the upper plates 7 and 7 (described later) There is.
The fixed coil 2 is positioned at a predetermined location in the magnetic gap by the bobbin 4
and held and fixed at the location.
[0015]
The magnetic circuit of this speaker is bonded to the upper surfaces of a pair of rectangular
parallelepiped magnets 5 and 5 arranged in parallel, the rectangular bottom plate 6 adhered to
the lower surface of these magnets, and the upper surface of each magnet 5 and 5 A long and
narrow magnetic gap of a fixed width is formed between the upper plates 7 and 7, and consists
of a pair of rectangular upper plates 7 and 7 arranged in the.
The polarization direction of the magnets 5 is as shown in FIG. 1, and in the magnetic gap, direct
magnetic lines of force from the N pole to the S pole are generated.
[0016]
As shown in FIG. 2, the fixed coil 2 and the short coil 3 are formed in a substantially rectangular
cross section so as to have a cross sectional shape approximately equal to the cross sectional
shape of the magnetic gap, whereby the entire magnetic field is substantially uniform. Because of
the position, distortion is reduced and good frequency characteristics can be obtained.
Here, G is a gap formed in the non-contacting portion of the fixed coil 2 and the short coil 3.
The resistance value (impedance) of the fixed coil 2 can be set to any value by adjusting the
number of turns, and a transformer or the like for impedance conversion is not required.
[0017]
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When a signal voltage is applied to the fixed coil 2, the short coil 3 is in the same magnetic field
as the fixed coil 2 and thus acts as a secondary coil, an induced current flows, and the short coil
3 vibrates due to the interaction with the magnetic field. Sound waves are emitted.
The short coil 3 is closely fixed to the fixed coil 2 at the three sides of the rectangle and only the
other side vibrates, so the weight of the vibrating portion is extremely light and it is possible to
reproduce a high frequency band.
In addition, since the induction current which flows into the short coil 3 is not large, the short
coil 3 is hard to be damaged.
[0018]
Although the efficiency of the electromagnetic induction depends on the distance between the
primary coil and the secondary coil and the strength of the magnetic field, in the present
embodiment, both the coils 2 and 3 are disposed in close proximity and in close contact with
three sides Because of this, electromagnetic induction is highly efficient, making it a highly
efficient speaker.
[0019]
As shown in FIG. 3, it can be seen that the loudspeaker of this embodiment can reproduce high
frequencies up to 100 KHz and flat frequency characteristics, and also has high efficiency.
[0020]
As described above, in the high-tone speaker of the present invention, the impedance can be set
to any value by adjusting the number of turns of the fixed coil, and thus no parts for impedance
conversion are required. The structure is simple and easy to manufacture.
Moreover, since the induction current which flows into the coil which consists of conductor films
is not large, it is hard to be damaged and its durability is high.
[0021]
When the coil made of a conductive film is a shorted coil of one turn in which both ends are
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electrically shorted, the electric resistance is reduced and the vibrating portion is lightened, so
that the efficiency is enhanced.
[0022]
In addition, when the fixed coil is positioned at a predetermined location in the magnetic gap and
the bobbin is held and fixed at the location, the coil can be easily attached to the magnetic circuit,
thereby improving the workability at the time of manufacture. .
[0023]
In addition, when the coil composed of the fixed coil and the conductor film is formed in a
substantially rectangular shape in cross section so that the whole thereof is positioned in a
substantially uniform magnetic field, distortion is reduced and good frequency characteristics are
obtained.
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