вход по аккаунту



код для вставкиСкачать
Patent Translate
Powered by EPO and Google
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
Specification 1, Name of the Invention Ultrasonic Transducers l) Composed of a transmitting
layer consisting of a material having a relatively high dielectric constant and a high acoustic
impedance, and a receiving layer consisting of a material having a relatively low dielectric
constant and a low acoustic impedance. An ultrasonic transducer, wherein in the ultrasonic
transducer, the two layers are planarly stacked and coupled to each other in a hybrid technology.
2, the scope of claims
8. Detailed description of the invention The present invention is formed of a transmitting layer
consisting of a material having a relatively high dielectric constant and high acoustic impedance,
and a receiving layer which is more aggressive than a material having a relatively low dielectric
constant and low acoustic impedance. Relates to an ultrasonic transducer. For conventional
ultrasonic transducers, companies including, for example, ultrasound in the form of an array with
a large number of unit transducers arranged in tandem, but particularly for medical applications,
have high penetration depths. Is required. However, at the same time, pulse processing that is
faithful to the KIr sound upon reception is also increasingly regarded as important, for example,
in tissue diagnosis. Conventional ultrasonic transducers use only one piezoelectric material as a
transmitter and simultaneously as a receiver. Condition company required in this case. For
example, it can only be obtained at relatively high technical costs, such as subdivision of unit
oscillators in the case of array configurations. Rapid improvement on reception has already been
tried. For example, polyvinyl difluoride (PVFt) was used instead of the piezoelectric material for
transmission and reception. An ultrasonic transducer of this type is disclosed, for example, in the
periodical publication "ELECTRONIC 8 LETTER 3 = issue of August 12 1976, page 12 and page
16 of page 16 and page 864". It is an object. This known converter does indeed improve the
quality of the signal. However, at the same time, the transmission time becomes worse. Because
the energy delivery at the time of transmission is a little too much because of the PVF that forms
the transmitting layer, the low efficiency of the layer. Another proposal has been made to give
some good para / s between send and nine times, and this is Florida's KeyB [May 29-June 2
1978]. R, G, 5tarts and J, D at the 6th 8th International Symposium on Contrast Imaging held at 5
cayn @. It is recommended in a paper titled @MONOLITHICS Summer LICON-PVF,
PIEZOELECTRIC ARRAYS FOR ULTRA SONIC IMAGING "by Plt + mmer. And <K page 15 the socalled "one-theta" array transducer described in the rationale on page 15 is a polyvinyl difluoride
internally having a very small dimension of this, from the piezoceramic ring serving as a
transmitter A receiver array consisting of (PVF,) layers is arranged.
A disadvantage of the arrangement of the spatially separated transmit and receive layers is the
loss of compactness, which makes the transmit / receive ratio less favorable than this k. The
object of the present invention is to construct an ultrasound transducer of the type mentioned at
the outset in such a way that a compact structure is obtained simultaneously with the best
possible results for transmission and reception. EndPage: 2 This object is achieved according to
the invention by planarly overlapping and combining K both layers in a hybrid technique.
Therefore, the invention belongs to the possibility of a very compact construction of the
converter. At the same time, considerations are made to optimize the conditions at the time of
transmission and reception. In a particularly advantageous embodiment of the invention, the
receiving layer is simultaneously used as a tuning layer for transmission. The configuration is
further simplified by simultaneously utilizing the receiving layer as the adjusting layer. By this k,
the excitation of a shorter pulse is kk 〈行 行. The receiving layer can be configured as a
conditioning layer for adaptation to body tissue or as a conditioning layer for adaptation to water
prior to the water section. Hereinafter, the present invention will be further described in detail
with reference to the drawings. Light up. FIG. 1 shows in cross-section the ultrasound transducer
according to the invention and the gWJ shows in cross-section the ultrasound transducer
according to the invention whose construction is cost-formed. In FIG. 1, an ultrasonic transducer
of a sand-inch structure comprises a substrate 1 provided with a transmitting layer 2 and a
receiving layer 8. All layers are connected to one another in a broad aspect by hybrid technology.
For the transmission layer, a material having a relatively high dielectric constant and high
acoustic impedance, for example, a piezoceramic material is used. In this case, it is preferred that
the transmitting layer be made of lead-zirbonate-titanate or lead-methaniobate. On the other
hand, the receiving layer 8 is made of a material having a lower dielectric constant and a lower
acoustic impedance. The receive layer simultaneously serves as a matching layer for
transmission. A convenient embodiment S ↑ uses a piezoelectric synthetic resin film having a Q
of about 8 · 16 pas / m and a Q of about 15. A convenient material for the piezoelectric synthetic
resin film used as the receiving layer 8 is polyvinyl difluoride (PVF). An epoxy resin can be used
as the substrate l. However, in this case the elastic force as a suitable backing material such that
an elastic flexible transducer structure is possible in relation to the elastic piezoelectric synthetic
resin film and the appropriate segmented piezoelectric ceramic material It is also possible to use
a rubber that is
In the embodiment of the converter of the at figure, the transmission layer 2 has on the side
opposite to the reception layer 8 a contact terminal for the transmission amplification. Therefore,
an electrical high frequency pulse for exciting the transmission layer 2 is led to the transmission
layer 2 through the transmission amplifier 4 so that transmission of ultrasonic pulses is
performed. Another contact, such as a thin contact layer or a contact path, may be interposed by
printed circuit technology between the receiving layer 8 and the transmitting layer 2, this contact
being the transmission pulse received by the receiving layer 8. It has an electrical reception
connection for reception s6 for counter pulse. A switch 5 is provided in parallel with the
receiving amplifier 6 so that the receiving amplifier 6 can be shorted during transmission by the
switch. At this time, k is a reference potential between the transmission layer 2 and the reception
layer 8. Furthermore, a connection line for a reference potential on the side opposite to the
receiving layer 8 on the side opposite to the transmitting layer 9? Have. A transducer which is a
variation of the embodiment of FIG. 1 is shown in FIG. This converter has a sandwich structure
consisting of a substrate 11 transmitting layer 2 and a receiving layer 8 as in FIG. However,
unlike the converter of FIG. 1, the component part 8 of the receiving circuit between the
transmitting layer 2 and the receiving layer 8 in a sandwich manner and <k receiving amplifier
are interposed in an IC configuration . This integrated construction style produces a particularly
compact construction form. The connection of the rc components between the transmitter layer
2 and the receiver layer 8 takes place via the signal 419. The ultrasound transducer, of which
only the cross section is shown in FIGS. 1 and 2, has in particular a rectangular shape in this
example. Arrays of this form are described, for example, in German Patent Application
Publication No. 261! Shown in 18492. Of course, transducer arrays of other shapes, such as
transducer arrays having a matrix arrangement of single (lO) EndPage: 3rd elements, can also be
used, in which case the planar geometry of the entire device is arbitrary. It can be square or
round. It is also possible to use ultrasound arrays which are likewise subdivided by unit elements.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views of different
embodiments of the present invention. 1: Substrate 2: Transmission layer 8. Reception layer 4:
Transmission amplifier 5. Switch 6. Reception amplifier? · · · · Connection line, 8 ... reception
amplifier. (11)EndPage: 4
Без категории
Размер файла
12 Кб
Пожаловаться на содержимое документа