JPS63102495A - Piezo-electric receiver - Google Patents

Abstract

PURPOSE:To produce leakage flux even if a piezo-electric receiver is used so that a person who has difficulty in hearing can use the piezo-electric receiver, by providing coil housing sections inside a handset at a receiver fitting part and keeping coils in the housing sections between the piezo-electric receiver and handset. CONSTITUTION:A piezo-electric receiver 1 is fixed to a handset 3 with coils 2 in between. The coils 2 are wound around coil bobbins 7 having U-shaped cross sections. Input terminals 4 and 5 are connected with the lead wires 6 and 9 of the coils 2 in parallel. Person who have no handicap hear the acoustic waves produced when a ceramic piezo-electric body vibrates as sounds produced from ear piece 8 and the person who have difficulty in hearing can hear the acoustic waves through the signal led to the pickup coil of a hearing aid provided in the vicinity of the ear pieces 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a piezoelectric receiver for use in telephone receivers and intercom receivers.

Conventional technology There are three types of handsets used in telephones and intercoms: electromagnetic, electrodynamic, and piezoelectric.The former two use a coil and a permanent magnet, so the leakage magnetic flux depends on the amount of current flowing through the coil. It occurs in such a way that it increases or decreases in proportion to.

In the case of the piezoelectric type, the operating principle is completely different from the electromagnetic type and electrodynamic type, and no magnetic field is generated at all.

In such a piezoelectric type, electrodes are provided on both sides of a piezoelectric ceramic thin plate, and when a signal is applied between the electrodes, the ceramic piezoelectric body expands and contracts in response to the signal. When this ceramic piezoelectric body is bonded to a metal plate, the whole body is deflected and deformed, which generates sound waves.

FIG. 3 shows a half-sectional view showing the mounting state of a conventional piezoelectric telephone receiver. The piezoelectric receiver 21 is fixed at a predetermined position on the handset 22 using a fixing jig 25. Input is performed through an input terminal 23 provided on the piezoelectric receiver 21. 24 is an earpiece that emits the output sound pressure.

Problems to be Solved by the Invention In the configuration of such a conventional piezoelectric handset, since sound is generated using the piezoelectricity of the ceramic piezoelectric body, almost no magnetic field is generated, and therefore no leakage magnetic flux is generated. . When a hearing-impaired person uses a telephone, there is a method of detecting magnetic flux leakage from the receiver, but this method cannot be used with telephones using conventional piezoelectric receivers.

The present invention is intended to solve these problems, and it is an object of the present invention to generate leakage magnetic flux even when a piezoelectric receiver is used, so that it can be used even by people with hearing loss.

Means for Solving the Problem In order to solve this problem, the present invention consists of a piezoelectric receiver, a coil, and a handset. It is designed to hold a coil inside.

Effect: With this configuration, the output sound pressure from the piezoelectric handset generates a signal for a healthy person, and the leakage magnetic flux from the coil generates a signal for a pickup coil for a hearing-impaired person, allowing both healthy and hard-of-hearing people to use a telephone using a piezoelectric handset. I did it like that.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 is a half-sectional view of the piezoelectric handset according to this embodiment. A piezoelectric receiver 1 is fixed to a handset 3 so as to sandwich a coil 2 therebetween. The coil 2 is wound around a coil coil 7 having a U-shaped cross section.
The thickness of the piezoelectric receiver 1 determines the volume of the second front air chamber, which is the space formed when the piezoelectric receiver 1 is attached. In this figure, piezoelectric handset 1
Although the input terminals 4 and 5 of the coil 2 are connected in parallel with the lead wires 6 and 9 of the coil 2, it is also possible to connect them in series. A healthy person hears the sound waves generated by the vibration of the ceramic piezoelectric body as sound emitted from the earpiece 8, and a hearing-impaired person hears
It can be heard by a signal induced by a pickup coil of a hearing aid installed near the earpiece 8.

FIG. 2 shows a half-folded view of a piezoelectric handset representing another embodiment according to the invention. In this case, the coil 12 is housed in a ring-shaped recess formed inside the handset 13. The ring-shaped protrusion inside the recess is in contact with the front surface of the piezoelectric receiver 11, and determines the volume of the space at the time of installation. The outer ring-shaped protrusion regulates the position of the outer periphery of the piezoelectric receiver 11. The functions of the earpiece 1, lead wire 16, and input terminals 14 and 15 are similar to those shown in FIG.

Effects of the Invention As is clear from the above description, the present invention is composed of a piezoelectric receiver, a coil, and a handset. By sandwiching the coil between the handsets, the piezoelectric handset can be used even by people with hearing loss, and by placing the coil directly inside the handset, it is possible to leak a large amount of magnetic flux. Furthermore, the coil bobbin can be used as a spacer when directly attaching the receiver.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a piezoelectric receiver according to one embodiment of the present invention, FIG. 2 is a cross-sectional view of a piezoelectric receiver according to another embodiment,
FIG. 3 is a sectional view of a conventional piezoelectric telephone receiver. 1.11.21...Piezoelectric receiver, 2,12.
...Coil, 3,13.22...Handset. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3

Claims (1)

[Claims] 1. A piezoelectric receiver, characterized in that a coil storage part is provided in a receiver attachment part inside the handset, and the coil is held between the receiver and the piezoelectric receiver.