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(1) Technical Field of the Invention The present invention relates to a transmitter or receiver for
a telephone. [2] Prior Art and Problems Conventionally, there are various types of transmitters
for telephones, such as carbon type, electromagnetic type, electrodynamic type, and receiver
types such as electromagnetic type, electrodynamic type and the like. However, these
conventional types have a large number of parts and require precision machining of the parts,
and there is a problem of <@ in order to achieve miniaturization @ cost reduction and cost
reduction. (3) Purpose of the Invention It is an object of the present invention to provide a small,
lightweight, low-cost new telephone handset. (4) Configuration of the Invention The present
invention is basically based on a diaphragm as a vibrator for converting sound pressure into an
electric signal (in the case of a transmitter) or electric signal into a sound pressure (in the case of
a receiver). By using the diaphragm with a ceramic piezoelectric element formed by integrating a
ceramic piezoelectric element, the number of parts can be reduced, the structure can be
simplified, and the above object can be achieved. That is, in the handset according to the present
invention, the vibrator comprising the diaphragm with the ceramic piezoelectric element as
described above and the back cover comprising the printed wiring board in the frame are the
front and rear air chambers before and behind the vibrator respectively. Are connected together
to the conductor pattern of the back cover through the entire frame of the vibrator and all the
conductors of the ceramic piezoelectric element of the Mano vibrator, and the conductor of the
back cover All external circuits are connected to the pattern. (5) Embodiments of the Invention
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings. FIG. 1 is a longitudinal sectional view, FIG. 2 is a bottom view, and FIG. 3 is a
perspective view from the bottom side in a disassembled state. This transmitter basically
comprises a frame 1, a vibrator 2, a spacer 3 and a back cover 4. The frame l is made of a gold
plated material and has a lower annular wall la and a "two-part cover portion lbk", and the upper
cover portion lb has a vent hole IC formed therein. The ceramic piezoelectric element 2b (! "-Integrally bonded, generally referred to as unimorph oscillator 0 unimorph oscillator has been
conventionally used for electronic buzzers and the like (3). Low frequency applications that can
be used have been put to practical use. The spacer 3 is of ring shape. The back cover 4 is made of
a printed wiring board, the circuit element 5 is mounted on the lower surface, and the external
circuit 6 is connected. The vibrator 2, the spacer 3 and the back cover 4 are assembled in the
frame 1 as shown in FIG. 1 and fixed and supported by cutting the lower edge of the lower
annular wall 1a of the frame l.
Thus, one front air chamber A and one rear air chamber B are formed before and after the
vibrator 2, that is, between the vibrator 2 and the frame upper cover portion ib and between the
vibrator 2 and the back cover 4 respectively. Be done. Further, the upper surface of the low
moving plate 2a of the vibrator 2 is in contact with the inner surface of the stepped portion of
the frame 1, and the caulking portion of the frame lower annular wall 1a is in contact with the
conductor pattern (not shown) of the back cover 4. Thus, the diaphragm 2a is connected to the
circuit elements of the back cover 4 through the frame l. On the other hand, the ceramic
piezoelectric element 2 b of the vibrator 2 is connected to the conductor pattern of the back
cover 4 by a conducting wire 4) and connected to the circuit element 5. According to the
configuration as described above, since the number of parts is small and the processing of the
parts does not require high accuracy, cost reduction is possible. In addition, since only one front
air chamber and one rear air chamber are formed on the front and rear sides of the unimorph
oscillator, the structure is simple and the size and weight can be reduced. Furthermore, since the
back cover is formed of a printed wiring board, the entire circuit element can be mounted
thereon as shown in the example. This is particularly effective for improving the characteristics
of the transmitter. That is, in the case of a transmitter, if the distance between the vibrator and
the circuit element is long, the impedance becomes high and noise occurs. However, if the circuit
element can be mounted on the back cover as shown in the illustrated example, the distance mt
to the imaging actuator can be shortened to the minimum, and a low impedance can be realized.
This provides a high performance transmitter with less noise. On the other hand, in the case of
the handset, there is no such problem, and there is no need to mount it on the circuit element
gold back cover. In the illustrated example, the back cover 4 is also provided with the vent holes
8, and the acoustic film 9 made of non-woven fabric is attached to the holes to improve the
acoustic characteristics. Further, although the illustrated example is a case of a transmitter, this
structure can also be applied to a receiver by appropriately selecting the capacities of the front
air chamber and the rear air chamber. (6) Effects of the Invention As described above, according
to the present invention, a small, lightweight, inexpensive, and high-performance telephone
handset can be realized.
Brief description of the drawings
FIG. 1 is a longitudinal sectional view, FIG. 2 is a bottom view, and FIG. 3 is a perspective view
from the bottom side in a disassembled state.
1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2 · · · · · · · · 2 · · · · · · · · · · · · · · · · ceramic
piezoelectric element, 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · ... Afterair room. Figure 1 Figure 20. Fig. 3) b
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