JPH054394Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (industrial field of application) This invention is a piezoelectric receiving unit incorporated into a telephone handset, which incorporates a field coil to improve hearing loss when using a hearing aid. The present invention relates to a piezoelectric receiving unit with a field coil that makes it easy for a person to receive a call.

(Conventional technology) When a hearing-impaired person who uses a hearing aid listens to a telephone call,
Normally, the receiver of a telephone set is brought close to the receiver of a hearing aid so that the transmitted voice can be heard using the sound waves emitted from the receiver of the telephone. However, this method makes it inconvenient to handle the handset, so we installed a microphone inside the hearing aid that receives sound waves and a pickup that receives the signal magnetic field from the phone and outputs an output.
Hearing aids that can be used by switching between the two have recently become popular.

In order to receive a signal magnetic field, a field coil is incorporated into the receiving unit built into the handset of the telephone, and when receiving a call, the magnetic field formed by this field coil is applied to the pick-up of the hearing aid to generate a voice current and receive the call. ing.

FIG. 3 shows an example of a conventional piezoelectric receiving unit equipped with such a field coil. A piezoelectric diaphragm 3 made of a ceramic plate is sandwiched between the frame 1 and the fixing ring 2, and a conductive connector 4 and a terminal piece 5 for applying a signal voltage to the diaphragm 3 are connected to the frame 1, the fixing ring 2, and the back case. 6, etc., wrap them in a metal case 7, and connect them by caulking. A sound hole 8 is provided on the front side of the metal case, and the metal case 7,
Necessary acoustic volumes 9, 9 are formed between the diaphragm 3, the frame 1, and the back case 6. A field coil 12 and a printed circuit board 13 are surrounded by a coil case 14 and attached to the back surface of the back case 6 (lower surface in FIG. 3). Reference numerals 15 and 16 are input terminals of this receiving unit.

When an audio signal is applied to the terminals 15 and 16, this vibrates the piezoelectric diaphragm 3 and generates a sound wave, which exits through the sound hole 8 and enters the ear. can do.

Furthermore, since this audio signal enters the field coil 12 and forms a sufficiently strong magnetic field around it, a hearing-impaired person can sense it with the pickup of a hearing aid and receive the call.

(Problems to be solved by the invention) The conventional receiver unit with a field coil piezoelectric type has a field coil attached to the finished receiver unit which forms acoustic volumes 9, 9 and is acoustically adjusted to achieve high performance. Since it is a type of structure that is attached, the structure is complicated and the number of parts is large.

B. Composition of the invention (Means for solving the problem) This invention involves attaching a field coil to a printed circuit board along with other electrical components, and using the printed circuit board as part of the wall that forms the acoustic volume. , the structure of the receiving unit with field coil piezoelectric type can be simplified and the number of parts can be reduced.

(Function) The piezoelectric receiving unit with a field coil of the present invention has a printed circuit board with a field coil attached and the necessary wiring, stacked on a frame in the same way as a conventional printed circuit board, caulked together with a diaphragm in a metal case, and printed. Because an acoustic volume is formed between the board, frame, and diaphragm, it eliminates waste and reduces assembly time compared to the conventional method of using a coil case on the completed receiving unit and attaching the field coil later. A piezoelectric receiving unit with a field coil can be obtained.

(Embodiment) FIG. 1 is a half longitudinal cross-sectional view showing a first embodiment of the receiving unit according to the present invention. The same reference numerals are used for parts equivalent to those of the conventional example shown in FIG. 3, and this will be explained below.

A printed circuit board 13 is stacked on the back surface (lower surface in FIG. 1) of the frame 1 on which the piezoelectric diaphragm 3 is stacked, and is caulked together with the frame 1 and the like by a metal case 7. A circular protrusion 7a formed on the periphery of the metal case 7 presses the periphery of the diaphragm 3 against the frame 1 instead of the conventional fixing ring 2. Metal case 7, diaphragm 3, printed circuit board 13
Acoustic volumes 9, 9 and a sound passage 17 are formed between them. The field coil 12 is attached to the upper surface (upper surface in FIG. 1) of a printed circuit board 13 prior to assembly of the receiving unit, and necessary wiring is provided between the field coil 12 and the printed circuit board. An input signal that causes the diaphragm to vibrate is applied to the diaphragm 3 via a metal elastic piece 18 soldered to a printed circuit board and a metal case 7 .

In this way, the field coil 12, like other electrical components 19, etc., is attached to the printed circuit board 13 and wired in advance, and this printed circuit board is connected to the frame, metal case, etc. in the same way as a conventional receiver unit. The assembly work is easy, and since the printed circuit board 13 is used as a partition wall for forming the acoustic volume 9, the conventional back case 6 for forming the acoustic volume is not required, and separate parts such as the coil case 14 are used. It is no longer necessary, and the number of parts can be reduced.

FIG. 2 shows a second embodiment of the invention. In this example, a field coil 12 is attached to the lower surface of a printed circuit board 13, the lower part thereof is covered with a back case 20, and the back case 20 is caulked together with a frame 1, a diaphragm 3, etc. with a metal case 7.

In this embodiment as well, the field coil can be incorporated by caulking the printed circuit board 13 to which the field coil 12 is attached and the frame 1 etc. with the metal case 7 in the same manner as in the past. Between the case 20 and the printed circuit board 1
3 to form an acoustic volume 9,9. Although the back case 20 is used, its structure and installation work are simpler than the conventional coil case 14 in which the field coil 12 is embedded and bonded.

C. Effects of the invention (1) Since the field coil 12 is attached to the printed circuit board 13 and wired in advance, and this is connected to the frame 1 and the diaphragm 3 through the metal case, the field coil can be easily attached.

(2) Since the printed circuit board 13 acts as a partition wall that forms an acoustic volume, the back case 6, coil case 14, etc. for forming this volume are no longer necessary.
Assembly is also easier.

(3) The number of parts can be reduced.

[Brief explanation of drawings]

Fig. 1 is a half longitudinal sectional view of the first embodiment of the piezoelectric receiving unit with field coil of the present invention, Fig. 2 is a longitudinal sectional view of the second embodiment, and Fig. 3 is a longitudinal sectional view of a similar conventional receiving unit. It is a partially vertical side view. DESCRIPTION OF SYMBOLS 1... Frame, 2... Fixed ring, 3... Piezoelectric diaphragm, 4... Conductive connector, 5... Terminal piece, 6... Back case, 7... Metal case, 7a...
... Protrusion, 8 ... Sound hole, 9 ... Acoustic volume, 12 ...
...Field coil, 13...Printed circuit board, 1
4... Coil case, 15, 16... Input terminal,
17... Sound passageway, 18... Ballistic piece, 19... Electrical parts, 20... Back side case.

Claims (1)

[Scope of utility model registration request] Piezoelectric diaphragm 3, frame 1, printed circuit board 1
3 are caulked together with a metal case 7 to form an acoustic volume 9 inside, and a field coil 12 is attached. A piezoelectric receiver unit with a field coil, characterized in that the partition wall forms an acoustic volume 9.