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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of the
loudspeaker of the present invention, FIG. 2 is a longitudinal sectional view of an insert including
a transducer, and FIG. 3 is a longitudinal sectional view of a clamped transducer, FIG. FIG. 5 is an
exploded perspective view of the insert. 1 ииииии Cone-shaped diaphragm, 2 иии и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и centering disc, 4 и и и и и и cone frame, 5 и и и
ииииииииииииииииииииииииииииииииииииииииии ? mounting plate 21 ...... shallow cup-, 22 ...... rim, 23 ...... printed wiring,
24.25.26 ...... top electronic device, 27 ...
иииииииииииииииииииииииииииииииииииииииииииииииииии Rubber Mounting base, 35.36 и и и и и Large solder contacts. ?
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
comprising a conical lift plate with a voice filter and a bobbin fitted with a piezoelectric
transducer, wherein the output voltage of the transducer is negatively fed back to the associated
amplifier. It is a thing. Generally, such speakers are used to recreate low tones of 1000) 1z or
less, and German Patent No. 967/67 uses piezoelectric transducers with one end clamped so that
the output voltage is not properly proportional to the acceleration of the speaker cone A
description is given of what is generally referred to as a motional feedback speaker for use with
///. According to the speaker of the present invention, the piezoelectric transducer is in the form
of a thin plate, the surface of which is perpendicular to the central axis of the voice coil, and is
hinged to a winding frame along the edges of two ridges. This arrangement has the advantage
that the frequency characteristics of the converter are perfectly linear and constant in the region
below 1000 H 2, so that the feedback voltage is directly proportional to the acceleration of the
cone. In a particularly advantageous example, the piezoelectric plate is rectangular and
suspended on a rubber mount along the opposite edge of am. It is necessary to connect it to an
impedance transformer, as the impedance of the piezoelectric transducer is very poor. It is
preferable to place the impedance transformation circuit as close as possible to the converter in
order to avoid possible introduction of ham (?). In this way the detrimental effects of added
parallel capacitance are avoided. For this purpose, in the seven embodiments of the present
invention, each mount is a printed circuit to which the electrical elements of each cage are
attached to form an impedance transformer as a whole. It is advantageous to place the printed
circuit board in a shallow tip and to form an airtight separation between the piezoelectric
transducer and the winding frame as a whole. By means of the air-tight separation it is possible
to avoid the effects on the hinged I + sheet of the air following the movement of the cone in the
cone winding. The natural frequency of the transducer is determined by its mass and by the stay
of the clamp. By appropriate selection of the amount of solder used to set the electrical
connection to one electrode of the piezoelectric plate, the overall natural frequency, including the
suspension of the transducer, can easily be maintained above 3000 H2. The present invention
will be described with reference to the drawings. Most of the first illustrated inventive
loudspeakers are known. A cone-shaped diaphragm l formed of paper fibers is suspended to a
metal frame through a rubber ring member 2 and a centering disk 3 called a spider. The winding
frame j provided with the voice coil 6 is fixed to the center of the cone / side. In this bonding
operation, the FF 7 and the insert 7 for supporting the thickness of the electric conversion lid 3
are also fixed in place.
This converter produces a voltage whose frequency range up to 7000 H2 is directly proportional
to the acceleration of the center of the cone. An ordinary style ?) hood t is provided to prevent
dust on the upper end of the winding frame j. In the present example, dust is removed from the
insert 7. The voice coil is disposed in the space of the ridge 1 of the magnet thread to which the
hoon frame q is fixed. In FIG. 2 the 4 comb insert 7 has a mounting plate I'5- in which the
shallow knob 2 is clamped. This mounting plate is tightened with a rim. For example, the
mounting plate is made of fQl synthetic material which can be manually operated as a registered
trademark "pertinax J", and the printed wiring B is provided on the lower surface thereof.
Electronic elements 2e, 15- and electrodes which together form an impedance transformation
circuit are provided on the upper surface, and the interconnections Cn and the like and the
transducers are connected by the printed wiring 23. The transducer I is configured as a
rectangular plate, which fixes the two layers of permanent polarized permanent magnet in the
opposite direction of the piezoceramic material. Gold metal electrodes y and 3? are deposited on
one major surface of a rectangular plate, and connected to the conductors 3 / and 32 by these
solderings. The rectangular plate 1 is clamped by two opposite parallel edges of rubber mounts
33 and 3 dabs. In addition, this tightening allows, for example, pivoting movement of the board.
The mass of the plate and the stiffness of the clamping together define the resonant frequency of
the converter. In order to locate this resonant frequency outside the operating area of the
loudspeaker, the large solder contacts 3S and 36 are used to increase the mass of the plate. The
support tip 2 of the insert 7 separates the transducer from the former in an air-tight manner
from the former, so that the effect of the 11 effect on the transducer plate pivoted by the
oscillating cylinder of the air in the latter can be avoided. The speaker of the example had the
following values: Speaker cone diameter = 200 # III speaker cone weight: 9 g voice coil weight: t7
size of piezoelectric plate: thickness of Ir ? О squared piezoelectric plate = 0.6 Il 11
Piezoelectric plate weight = 0.3 ? ? ? solder dripping weight: o, ig
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