JPH0221840Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a piezoelectric handset, such as a telephone handset, which performs electroacoustic conversion using a piezoelectric vibrator made of ceramic or the like.

(Prior Art) Conventionally, this type of piezoelectric receiver generally has a structure in which an electrode is provided on a piezoelectric vibrator, and is not equipped with a voice coil like an electromagnetic receiver.

(Problem that the invention aims to solve) For this reason, conventional telephone receivers of this type cannot perform the hearing aid function by detecting the magnetic field generated by the voice coil and extracting it as sound. There was a problem that it was not possible to meet the various standards required by the industry.

The present invention was proposed in order to solve the above problems, and its purpose is to provide a piezoelectric type that sufficiently fulfills the hearing aid function by being equipped with a magnetic field generating coil for voice pickup. The purpose is to provide a handset.

(Means for solving the problems) The present invention will be explained below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
1 is a printed wiring board, on the surface of which a magnetic field generating coil 1a made of a copper foil pattern formed by etching is formed as shown in FIG.
A sound current proportional to a voltage applied to an electrode of a piezoelectric vibrator 3, which will be described later, is applied to this magnetic field generating coil 1a. Further, terminals 1c are attached to the lower surface of the printed wiring board 1 to be connected to electrodes 1b at both ends of the magnetic field generating coil 1a.

Next, as shown in FIG. 1A, a diaphragm 2 having an approximately truncated conical outer shape so as to be hollow inside is attached to the outer periphery of the surface of the printed wiring board 1. A piezoelectric vibrator 3 made of ceramic or the like is integrally fixed to the inner surface so as to face the printed wiring board 1. Here, the piezoelectric vibrator 3 is provided with a plurality of electrodes (not shown), and these electrodes are connected to the circuit pattern on the surface of the printed wiring board 1 by lead wires (not shown), and are connected to terminals. 1b. In the figure, reference numeral 4 indicates a unit cover that is attached to the outer peripheral edge of the printed wiring board 1 so as to cover the diaphragm 2.

To explain this operation, the piezoelectric vibrator 3 vibrates due to the voltage applied to the piezoelectric vibrator 3 via the terminal 1c, and the diaphragm 2 vibrates accordingly to generate sound. At the same time, the magnetic field generating coil 1a
Since an audio current proportional to the voltage flows through the
A magnetic field corresponding to this current is generated around printed wiring board 1 . Therefore, for example, a hearing aid with a built-in small pickup coil may be preformed.
When a hearing-impaired person presses the telephone receiver according to the present invention against the ear on which the hearing aid is worn,
A voltage is induced in the pick-up coil inside the hearing aid, causing a sound current to flow, and it is possible to pick up the same sound as that produced by the piezoelectric vibrator 3, and by amplifying this sound as appropriate, it can be used as a hearing aid. It satisfies the function.

Next, FIG. 2 shows a second embodiment of the present invention, which includes a component 5 of an impedance conversion circuit for impedance matching between a piezoelectric vibrator 3 and a magnetic field generating coil 1a. It is arranged on the outer periphery of the printed wiring board 1.

Furthermore, FIGS. 3 and 4 show a third embodiment and a fourth embodiment of the present invention, in which printed wiring boards 1A,
A magnetic field generating coil made of a copper foil pattern is formed on 1B in the same manner as described above, and it also serves as a diaphragm, and a piezoelectric vibrator 3 is fixed to the inner surface of the printed wiring boards 1A and 1B. According to these embodiments, the cost can be reduced by reducing the number of members by omitting the diaphragm 2 of the first embodiment, and especially in the example of FIG. The use of the wiring board 1B has the advantage that the receiver can be made thinner.

(Effects of the invention) As described above, according to the invention, a magnetic field is provided in which a current proportional to the voltage is supplied to the printed wiring board for supplying the voltage applied to the piezoelectric vibrator fixed to the diaphragm. Since the generating coil is formed of copper foil, it is possible to provide a hearing aid function even though it is a piezoelectric type, and it is possible to easily construct a receiver that can be used even by people with hearing loss.

In addition, since the magnetic field generating coil can be formed using a copper foil pattern on a printed wiring board, there is no need for space for the magnetic field generating coil, making it possible to make the handset thinner and more compact. It has the advantage of being low cost and easy to perform by etching or the like.

[Brief explanation of the drawing]

FIG. 1A is a sectional view showing the first embodiment of the present invention;
2 is a plan view of a printed wiring board showing a second embodiment of the present invention, and FIGS. 3 and 4 are a plan view of a printed wiring board showing a third embodiment and a fourth embodiment of the present invention, respectively. FIG. 3 is a side sectional view of a main part showing an example. 1, 1A, 1B...Printed wiring board, 1a...Magnetic field generation coil, 2...Vibration plate, 3...Piezoelectric vibrator.

Claims (1)

[Scope of utility model registration request] A piezoelectric receiver comprising a printed wiring board for supplying a voltage applied to a piezoelectric vibrator fixed to a diaphragm, and a magnetic field generating coil to which a current proportional to the voltage is supplied formed of copper foil. .