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JPH02158299

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DESCRIPTION JPH02158299
[0001]
[Outline] The present invention relates to a telephone receiver for generating a leakage magnetic
field according to received voice, and it is an object of the present invention to provide a
magnetic leakage coil which is provided on the receiver side, has an iron core and reduces the
number of turns and constitutes a step-up transformer. , A circular coil in which the primary coil
and secondary coil of a circular winding are closely coupled and the outer side is roughly
toroidally wound with a wire or a strip of high permeability material to form a transformer,
coaxial position with the receiver To connect the primary coil to the output of the external
receiver drive circuit, connect the secondary coil to the input of the receiver, and generate a
leaked magnetic field according to the received voice in the axial direction and outer peripheral
radial direction of the receiver Configure. BACKGROUND OF THE INVENTION 1. Field of the
Invention The present invention relates to a telephone receiver for generating a stray magnetic
field in response to incoming speech. In recent years, telephones in western countries are aiming
at the welfare of people with deafness, and require a magnetic leakage standard for coupling to a
receiver to a hearing aid, for example, in the United States, it does not conform to R3504
standard of EIA standard. And selling is getting difficult. 2. Description of the Related Art In the
past, the conversion efficiency from the electro-magnetic receiver to the electric + magnetic →
acoustic was poor, the leakage magnetic field from the drive coil of the diaphragm of the receiver
was large, and the magnetic coupling to the hearing aid was easy. In recent years, as a result of
the pursuit and improvement of the electroacoustic conversion efficiency, that is, the sensitivity,
in both the electromagnetic type handset and the dynamic type handset, the leakage magnetism
is hardly generated. Furthermore, in the case of the piezoelectric handset, in principle no leaked
magnetic field is generated at all. Therefore, in recent years, in both the dynamic type and the
piezoelectric type, a coil for frQ% leakage is often provided outside or integrally with the receiver
to meet the above requirement. [Problems to be Solved by the Invention] However, ■ The
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piezoelectric handset requires high impedance and high voltage driving, and when the subscriber
line loss is large, the voltage drop becomes large and the handset driver circuit does not operate
sufficiently. There is a fear that the loud sound may distort. ■ The handset drive circuit in the
main unit should be common, and it should be possible to use it for both piezoelectric and
dynamic handsets. ■ A coil for magnetic leakage for a piezoelectric receiver is driven by a part
of receiver drive power, but in order to increase its efficiency, it is necessary to wind an
extremely fine wire several thousand times in the air core, and the productivity is not good .
There were problems such as An object of the present invention is to provide a magnetic leakage
coil which is provided on the receiver side, has an iron core, reduces the number of turns, and
constitutes a step-up transformer. [Means for Solving the Problems] As shown in FIG. 1, the
above-mentioned problem is that the primary coil 1 and the secondary coil 2 of the circular
winding are tightly coupled, and the outside is a wire of high permeability material or A circular
coil 4 that is roughly toroidally wound by a strip 3 to form a transformer is disposed coaxially
with the receiver 5, and the primary coil l is connected to the output of the external receiver
drive circuit 6, a secondary coil 2 Is solved by the receiver of the present invention, which is
connected to the input of the receiver 5 and generates a leakage magnetic field corresponding to
the received voice in the axial direction and the outer peripheral radial direction of the receiver
5.
In addition, the above-mentioned receiver can also be used in which the winding of the circular
coil 4 is a single coil 11 and is connected in series or in parallel with the receiver 5. [Operation]
That is, by disposing a circular coil of a transformer configuration in which a magnetic wire is
toroidally wound to a receiver, the purpose can be met at once. FIG. 1 (a) shows the principle of
the present invention, FIG. 1 (b) shows a circuit diagram of the piezoelectric receiver, and FIG. 1
(c) shows a circuit diagram of the dynamic receiver. As shown in FIG. 1 (a), if the wire or strip 3
of high permeability material is roughly toroidally wound around the ring-shaped 9 windings of
the tightly coupled primary coil 1 and secondary coil 2 as a core. When the core has a core coil
and the relative permeability is equivalent to -μ, it can be reduced to 1 / vl 7 compared to the
number of turns of the coil at the time of an air core. It is also possible to emit sufficient leakage
magnetic field from the Also, as shown in FIG. 1 (b), since the impedance can be converted to a
low height by the transformer configuration, the receiver drive circuit 6 for a low impedance
dynamic type receiver can be piezoelectric through the circular coil 4 having the transformer
configuration. It can be commonly used for the type handset 5 as well. As a result, the drive
circuit for high voltage output is not used, and even when the subscriber line loss is large, it can
be operated at a sufficient volume without distortion of sound. Furthermore, the circular coil 4 is
disposed coaxially with the receiver 5 to generate a leakage magnetic field in the vicinity of the
receiver 5, so that the coupling with the hearing aid can be performed at an extremely
straightforward position. As shown in FIG. 1 (C) (with respect to the dynamic type receiver 5, a
circular coil 41 having a similar number of turns and a single coil 11 having a small number of
turns is connected in series or in parallel. , A sufficient leakage magnetic field can be generated
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with a minute power. Thus, it is possible to provide a coil for magnetic leakage which is provided
on the receiver side, has a iron core, reduces the number of winding steps, and constitutes a stepup transformer. The subject matter of the present invention will be specifically described by way
of embodiments shown in the drawings. The same reference numerals indicate the same objects
throughout the drawings, and FIG. 2 shows an embodiment of the present invention. This
embodiment relates to a telephone using the piezoelectric receiver 5. The receiver drive circuit of
the telephone main body shares the one for the dynamic receiver which has been used until now.
A circular coil 4 with a transformer configuration completed on a winding frame with a cross
section of 5 × 5 n + m and an inner diameter of 20 m + n is bonded to the rear surface of the
stepped short cylindrical piezoelectric receiver 5 with a diameter of 30 × 5 mm, It is built in.
The primary coil 1 is pulled out of the handset 7 and connected to the output of the receiver
driving circuit of the main body (not shown), and the secondary coil 2 is connected to the input
terminal 51 of the receiver 5. Here, the output of the handset driver circuit is for driving the
dynamic handset as described above, and its impedance is 150 Ω. The impedance of the
piezoelectric receiver 5 is 3 Ω, so it is sufficient to construct a transformer of primary: secondary
= 150 Ω: 3 with Ω = N: 4.47 N, and at this time, outside the coil winding. Is roughly toroidally
wound with Permalloy's width 1 × thickness 0.2 tarn strip 3 so that the equivalent relative
permeability increases and the total number of turns can be reduced to 1710 or less, but about
174 N with allowance. = 100 volumes, reduced to a total of 547 volumes. Although not shown in
the drawings, as another embodiment, the winding wire of the circular coil is a single winding
when using a dynamic handset, and has a high impedance when connecting in parallel to the
handset when using a parallel connection. It may be fixed to the outside of the receiver by
bonding or the like as a low impedance one. The above embodiment shows an example, and the
dimensions, the impedance, the number of turns, and the values of the components are merely
examples, and the configuration of the circular coil 4 is not limited to the outer diameter of the
receiver 5 or the outer shape. There is no problem even with a fixing method that does not
adhere, such as mold-in molding integrally.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a principle view of the present invention, and FIG. 2 is an embodiment of the present
invention.
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In the figure, 1 is a primary coil, 2 is a secondary coil, 3 is a strip, 4 is a circular coil, 5 is a
handset, 6 is a handset drive circuit, 7 is a handset, 11 is a single coil, 51 is an input terminal It
is. As described above, according to the present invention, the magnetic leakage coil for the
hearing aid is provided on the receiver side, and it becomes extremely easy to be coupled, and
with the iron core, the number of turns is reduced and the step-up transformer is configured.
Thus, the drive circuit of the low impedance handset can be shared with the high impedance
piezoelectric handset, and the manufacturability can be greatly improved as compared with the
conventional leakage magnetic coil, and these effects are Remarkable. x7 light n-practical bag j
second figure L circular cari) b) pressure ty 葛 葛 圀 ((リ ナ ミ 型 型 同 同 m づ m づ c ト c ト n
layer, 里m
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