JP5388025B2 - Ultrasonic transmitting / receiving element and ultrasonic transmitting / receiving sheet - Google Patents

Description

  The present invention relates to an ultrasonic transmission / reception element and an ultrasonic transmission / reception sheet, and more specifically, an ultrasonic transmission / reception element having an organic transistor and a transmission / reception member formed of a polymer material having a piezoelectric effect, and an organic transistor on a bendable sheet. The present invention relates to an ultrasonic transmission / reception sheet in which a plurality of ultrasonic transmission / reception elements each having a transmission / reception member formed of a polymer material having a piezoelectric effect are arranged.

Conventionally, as this type of sheet, a sheet in which a plurality of sensor elements each having an organic transistor connected to a sensor are arranged in a matrix on a bendable sheet has been proposed (for example, see Patent Document 1). In this sheet, by applying and scanning the gate voltage of each organic transistor in order, the physical quantity and chemical quantity detected by each sensor element are obtained, and the physical quantity and chemical quantity obtained by data processing are obtained. Detailed data for the target object can be obtained. As the sensor, any one or more of a pressure sensor, a temperature sensor, an optical sensor, an acceleration sensor, a strain sensor, a magnetic sensor, a temperature sensor, a capacitor, a voltage sensor, and a chemical sensor can be used.
JP-A-2005-150146

  In general, since ultrasonic waves have less influence on the human body than electromagnetic waves, they are attracting attention as being used for sensing in devices that assume that a person is present in the vicinity. On the other hand, a thin plate-like member formed of a polymer material having a piezoelectric effect is also known as a cylindrical member that is used for transmission / reception of ultrasonic waves. Arrangement is not easy, and many man-hours are required to manufacture such a sheet.

  A main object of the ultrasonic transmitting / receiving element of the present invention is to provide an element having a structure that can be easily arranged on a bendable sheet. Another object of the ultrasonic transmission / reception sheet of the present invention is to provide a plurality of ultrasonic transmission / reception elements arranged on a bendable sheet.

  The ultrasonic transmission / reception element and the ultrasonic transmission / reception sheet of the present invention employ the following means in order to achieve the main object described above.

The ultrasonic transmission / reception element of the present invention comprises:
An ultrasonic transmitting / receiving element capable of transmitting and receiving ultrasonic waves,
An organic transistor,
A transmission / reception member formed into a rectangular thin plate shape by a polymer material having a piezoelectric effect, and having one end in the longitudinal direction electrically connected to one of the source and drain of the organic transistor and fixed in a cantilever manner When,
The transmitting / receiving member is disposed between the organic transistor and the transmitting / receiving member so as to be aligned with the other end in the longitudinal direction of the transmitting / receiving member, and the transmitting / receiving member is curved by pushing the other end away from the organic transistor. A bending member;
It is a summary to provide.

  In the ultrasonic transmission / reception element of the present invention, one end in the longitudinal direction of a transmission / reception member formed into a rectangular thin plate shape by a polymer material having a piezoelectric effect is electrically connected to one of a source and a drain of an organic transistor. Then, the bending member is disposed between the organic transistor and the transmission / reception member so as to align with the other end in the longitudinal direction of the transmission / reception member, and the other end of the transmission / reception member is connected to the organic transistor. The transmission / reception member is bent by being pushed away from. Since the transmission / reception member can adjust the reception sensitivity according to the degree of bending, the degree of bending at which the sensitivity of the transmission / reception member with respect to the target ultrasonic wavelength with respect to dimensions such as the length and width of the transmission / reception member is good. By adjusting the size of the bending member so as to be, an ultrasonic transmission / reception element having good sensitivity can be configured with a simple structure. In addition, the organic transistor can be formed in a matrix form on the sheet by using a printing technique, and can be formed in a sheet form by connecting a plurality of transmitting and receiving parts at one fixed end thereof, Considering that a plurality of bending members whose dimensions are adjusted can be connected to form a sheet, it is easy to place a plurality of ultrasonic transmission / reception elements of the present invention on a bendable sheet. .

  In such an ultrasonic transmission / reception element of the present invention, as a material for forming the transmission / reception member, polyvinylidene fluoride, vinylidene fluoride / trifluoride ethylene copolymer, vinylidene fluoride / tetrafluoroethylene copolymer, polyvinyl fluoride, Various polymer materials having piezoelectric effect such as polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyacrylonitrile, vinylidene cyanide / vinyl acetate copolymer, vinylidene cyanide / vinyl benzoate copolymer can be used. However, polyvinylidene fluoride, vinylidene fluoride / trifluorinated ethylene copolymer, and vinylidene fluoride / tetrafluoroethylene copolymer having particularly high piezoelectricity are suitable.

  Further, in the ultrasonic wave transmitting / receiving element of the present invention, the bending member is a predetermined ratio centered on 0.8 with respect to a distance between a contact portion of the transmitting / receiving member and the fixed portion of the transmitting / receiving member. The other end may be formed to be pushed away from the organic transistor.

The ultrasonic transmission / reception sheet of the present invention comprises:
A transmission / reception unit formed in a rectangular shape by a polymer material having a piezoelectric effect and capable of transmitting and receiving ultrasonic waves, and an organic transistor in which one source or drain electrode is electrically connected to one end of the transmission / reception unit An ultrasonic transmission / reception sheet comprising a plurality of ultrasonic transmission / reception elements arranged on a bendable sheet,
An organic transistor sheet formed by arranging a plurality of the organic transistors on a bendable sheet;
A plurality of transmission / reception units are arranged at positions where one end of the transmission / reception unit is aligned with one electrode of the source or drain of each organic transistor in the organic transistor sheet when stacked on the organic transistor sheet, A transmission / reception unit sheet formed by connecting the one end of the transmission / reception unit;
When the organic transistor sheet and the transmission / reception unit sheet are arranged and joined, the other end of the plurality of transmission / reception units in the transmission / reception unit sheet is pushed away from the organic transistor sheet. A bending part sheet in which a plurality of bending parts for bending a plurality of transmission / reception units are formed;
The organic transistor sheet, the bending portion sheet, and the transmission / reception unit sheet in this order, the one electrode of each organic transistor in the organic transistor sheet and the one end of each transmission / reception unit in the transmission / reception unit sheet It is joined to be electrically connected and fixed.
This is the gist.

  In the ultrasonic transmission / reception sheet of the present invention, the organic transistor sheet is formed by arranging a plurality of organic transistors on a bendable sheet, and when the transmission / reception unit sheet is stacked on the organic transistor sheet, the source of each organic transistor in the organic transistor sheet Alternatively, a plurality of transmission / reception units are arranged at a position where one end of a transmission / reception unit which is formed in a rectangular shape with a polymer material having a piezoelectric effect on one electrode of a drain and can transmit / receive ultrasonic waves is aligned and a plurality of When one end portion of the transmission / reception unit is connected, and the bending portion sheet is arranged and bonded between the organic transistor sheet and the transmission / reception unit sheet, the plurality of transmission / reception units in the transmission / reception unit sheet For multiple bends that bend multiple transmit / receive units by pushing the other end away from the organic transistor sheet Position is formed. The ultrasonic receiving sheet of the present invention is an organic transistor sheet, a bending portion sheet, and a transmitting / receiving unit sheet, which are stacked in this order, and one of the source and drain electrodes of each organic transistor in the organic transistor sheet and the transmitting / receiving unit sheet It is obtained by joining so as to electrically connect and fix one end of each transmitting / receiving unit connected. In the ultrasonic transmission / reception sheet of the present invention, the ultrasonic transmission / reception element has the same structure as the ultrasonic transmission / reception element of the present invention described above. A plurality of ultrasonic transmitting / receiving elements having good sensitivity are arranged on a bendable sheet by adjusting the size of the bending portion so that the degree of bending is improved so that the sensitivity of the transmitting / receiving member with respect to the wavelength is good. Can do.

  In the ultrasonic transmission / reception sheet of the present invention, materials for forming the transmission / reception unit sheet include polyvinylidene fluoride, vinylidene fluoride / trifluoride ethylene copolymer, vinylidene fluoride / tetrafluoroethylene copolymer, and polyfluorination. Use various polymer materials with piezoelectric effect such as vinyl, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyacrylonitrile chloride, vinylidene cyanide / vinyl acetate copolymer, vinylidene cyanide / vinyl benzoate copolymer, etc. However, polyvinylidene fluoride, vinylidene fluoride / trifluorinated ethylene copolymer, and vinylidene fluoride / tetrafluoroethylene copolymer having particularly high piezoelectricity are suitable. In addition, the transmission / reception unit sheet in the ultrasonic transmission / reception sheet of the present invention may be formed by punching a thin plate member formed of any of the materials described above.

  Further, in the ultrasonic transmission / reception sheet of the present invention, each bending portion in the bending portion sheet is at an interval between a contact portion of each transmitting / receiving portion in the transmission / reception portion sheet and the fixed portion of the transmitting / receiving portion. On the other hand, the other end may be formed so as to be pushed away from the organic transistor sheet by a predetermined ratio centered on 0.8. Furthermore, in the ultrasonic transmission / reception sheet of the present invention, the plurality of ultrasonic transmission / reception elements may be arranged in a matrix.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of a configuration of an ultrasonic transmission / reception element 20 as an embodiment of the present invention. The ultrasonic transmission / reception element 20 according to the embodiment includes a transmission / reception member 22 formed in a rectangular thin plate shape by a polymer material having a piezoelectric effect, and an electrode 38 of a drain 36 by bonding 39 on one end 24 of the transmission / reception member 22. The organic transistor 30 is electrically connected, and the bending member 40 is configured to bend the transmitting / receiving member 22 by pushing up the other end 26 of the transmitting / receiving member 22 from the organic transistor 30 side. Note that a surface different from the connection surface of the one end portion 24 of the transmitting / receiving member 22 to the electrode 38 is provided. Since the transmission / reception member 22 has a piezoelectric effect as described above, when the voltage pulse is generated in the electrode 38, the transmission / reception member 22 vibrates at the frequency of the voltage pulse, and conversely, when the transmission / reception member 22 is vibrated, the electrode 38 is vibrated. A voltage pulse corresponding to the vibration is generated. The transmission / reception member 22 has the above-described configuration, and one end 24 is a cantilever fixed end, and the other end 26 is an open end of what is supported by the bending member 40.

  The polymer material forming the transmission / reception member 22 may be any material as long as it has a piezoelectric effect, but may be polyvinylidene fluoride, vinylidene fluoride / trifluoride ethylene copolymer, vinylidene fluoride.・ Tetrafluoroethylene copolymer, polyvinyl fluoride, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyacrylonitrile, vinylidene cyanide / vinyl acetate copolymer, vinylidene cyanide / vinyl benzoate copolymer, etc. are suitable. is there. In particular, polyvinylidene fluoride, vinylidene fluoride / trifluorinated ethylene copolymer, and vinylidene fluoride / tetrafluoroethylene copolymer having high piezoelectricity are suitable.

  The ultrasonic transmitting / receiving element 20 according to the embodiment is applied when a voltage pulse in an ultrasonic region having a frequency of 20 kHz or higher is applied to the source 34 in a state where the voltage is applied to the gate 32 of the organic transistor 30 and the organic transistor 30 is turned on. The transmission / reception member 22 vibrates in response to the generated electrical pulse, thereby transmitting ultrasonic waves from the transmission / reception member 22. On the other hand, when a voltage is applied to the gate 32 of the organic transistor 30 and the organic transistor 30 is turned on in the state where the ultrasonic wave is irradiated, the transmission / reception member 22 vibrates according to the frequency of the ultrasonic wave. Ultrasonic waves are received by detecting the generated voltage pulse on the source 34 side.

  Next, the performance of the ultrasonic transmitting / receiving element 20 of the embodiment will be described. FIG. 2 shows the bending distance d between the bonding member 39 and the bending member 40, which connects one end 24 of the transmitting / receiving member 22 when the ultrasonic transmitting / receiving element 20 is irradiated with ultrasonic waves of 40 kHz, and the bending member 40. 4 is a graph showing a relationship between a bending height h when the transmitting / receiving member 22 is bent and an output voltage generated in an electrode 38. As shown in the figure, for a 40 kHz ultrasonic wave, the ratio of the bending height h to the bending interval d (h / d) is in the range of 0.7 to 0.9 when the bending interval d is small, that is, 0. The sensitivity is good in a range including 8, and when the curve interval d is large, the sensitivity is good at 0.5 or more. FIG. 3 is a graph showing the relationship between the width W of the transmitting / receiving member 22, the length L of the transmitting / receiving member 22, and the output voltage generated at the electrode 38 when the ultrasonic transmitting / receiving element 20 is irradiated with 40 kHz ultrasonic waves. As shown in the figure, for a 40 kHz ultrasonic wave, the transmission / reception member 22 exhibits a good sensitivity when the length L is 10 mm or more and the width W is 2 mm or more. Therefore, for a 40 kHz ultrasonic wave, the transmitting / receiving member 22 having a small size and good sensitivity has a length L of 10 mm, a width W of 5 mm, a bending interval d of 5 to 7 mm, and a bending height h. 4 to 6 mm. For ultrasonic waves having a frequency other than 40 kHz, the length L, the width W, the bending interval d, and the bending height h of the transmitting / receiving member 22 with good sensitivity can be obtained by performing a similar experiment or the like. .

  FIG. 4 is an explanatory diagram showing reception directivity when ultrasonic waves are received by the ultrasonic transmission / reception element 20 of the embodiment, and FIG. 5 is transmission directions when ultrasonic waves are transmitted from the ultrasonic transmission / reception element 20 of the embodiment. It is explanatory drawing which shows property. As shown in the figure, the ultrasonic transmitting / receiving element 20 of the embodiment has good reception directivity and transmission directivity in all directions.

  As described above, the ultrasonic transmission / reception element 20 of the embodiment is suitable not only as a transmission element that transmits ultrasonic waves but also as a reception element that receives ultrasonic waves. However, as illustrated in FIG. A pulse transmitter 52 that transmits a pulse and a receiver 54 are connected to the source 34 of the ultrasonic transmission / reception element 20 via a changeover switch 56, and the pulse transmitter 52 and the ultrasonic transmission / reception element 20 are connected by a changeover switch 56. Then, it is possible to transmit ultrasonic waves from the ultrasonic transmission / reception element 20 and then connect the receiver 54 and the ultrasonic transmission / reception element 20 by the changeover switch 56 to receive the ultrasonic waves reflected by the object. In this way, by measuring the time from when the ultrasonic wave is transmitted until it is received, the distance between the ultrasonic transmitting / receiving element 20 and the object can be measured.

  Next, the ultrasonic transmission / reception sheet 100 in which the ultrasonic transmission / reception elements 20 of the embodiment are arranged in a matrix will be described. FIG. 7 is an explanatory diagram illustrating an outline of the configuration of the ultrasonic transmission / reception sheet 100 according to the embodiment. The ultrasonic transmission / reception sheet 100 according to the embodiment includes 64 ultrasonic transmission / reception elements 20 arranged in 8 rows and 8 columns on a bendable sheet, and the gate 32 of the organic transistor 30 of the ultrasonic transmission / reception element 20 for each row. And bit lines BL1 to BL8 for connecting the source 34 of the organic transistor 30 of the ultrasonic transmitting / receiving element 20 for each column.

  The ultrasonic transmission / reception sheet 100 according to the embodiment includes an organic transistor sheet 110 formed with a plurality of organic transistors 30 arranged in a matrix as illustrated in FIG. 8, and an organic transistor sheet 110 as illustrated in FIG. A plurality of transmission / reception members 22 are arranged in a matrix so that one end 24 is aligned with the electrode 38 of the drain 36 of each organic transistor 30 when stacked, and one end 24 of the plurality of transmission / reception members 22 is arranged. The transmission / reception unit sheet 120 connected by the connection unit 124, the vertical connection unit 122, and the horizontal connection unit 126, and the transmission / reception member 22 when stacked on the transmission / reception unit sheet 120 as illustrated in FIG. A plurality of bending members 40 are arranged in a matrix so that the bending member 40 is aligned with the other end portion 26, and the bending is performed. The bending portion sheet 130 formed by connecting the material 40 with the vertical connecting portion 134 and the horizontal connecting portion 136 and the organic transistor sheet 110, the bending portion sheet 130, and the transmitting / receiving portion sheet 120 are superposed in this order. The electrode 38 of the organic transistor 30 and the one end 24 of the transmission / reception member 22 can be joined by bonding 39.

  For example, the organic transistor sheet 110 is formed by applying silver nanoparticles on a plastic film by an ink jet printer and firing the silver nanoparticles in the atmosphere at 220 ° C. for 1 hour to produce a gate electrode of each organic transistor 30. A series resin is applied by a screen printer to produce partition walls around each gate electrode, and a polyimide precursor diluted to 8 mPas is applied onto the gate electrode in the partition by ink jet and cured at 180 ° C. in a nitrogen atmosphere. A polyimide gate insulating film (thickness 1 μm) is produced. Then, an organic semiconductor pentacene having a thickness of 50 nm is formed using a vacuum deposition method, and finally, the organic transistor 30 is completed by forming the source and drain electrodes with a vacuum deposition apparatus. .

  The transmission / reception unit sheet 120 includes, for example, polyvinylidene fluoride, vinylidene fluoride / trifluoride ethylene copolymer, vinylidene fluoride / tetrafluoroethylene copolymer, polyvinyl fluoride, polyvinyl chloride, polyvinylidene chloride, and polyacrylonitrile. A thin plate is formed from a polymer material having a piezoelectric effect, such as polychlorinated acrylonitrile, vinylidene cyanide / vinyl acetate copolymer, vinylidene cyanide / vinyl benzoate copolymer, and a sheet 120 for a transmission / reception unit is completed by stamping. Thus, it can be formed. The polymer material forming the transmission / reception unit sheet 120 is particularly preferably polyvinylidene fluoride, vinylidene fluoride / trifluoride ethylene copolymer, or vinylidene fluoride / tetrafluoroethylene copolymer having high piezoelectricity. In the examples, it was made of polyvinylidene fluoride.

  The bending portion sheet 130 can be formed, for example, by forming a thin plate from various plastic materials and completing the bending portion sheet 130 by punching.

  The ultrasonic transmission / reception sheet 100 according to the embodiment applies voltages sequentially to the word lines WL1 to WL8 to sequentially turn on the organic transistors 30 for each row and outputs voltage pulses to the bit lines BL1 to BL8 in order. Ultrasonic waves can be transmitted sequentially from the acoustic wave transmitting / receiving element 20, voltages are sequentially applied to the word lines WL1 to WL8 to turn on the organic transistors 30 in each row in order, and voltage pulses are detected on the bit lines BL1 to BL8. Accordingly, the ultrasonic wave can be received by each ultrasonic wave transmitting / receiving element 20. That is, an ultrasonic wave can be transmitted by an arbitrary ultrasonic transmitting / receiving element 20 among the plural ultrasonic transmitting / receiving elements 20 arranged in a matrix, and an arbitrary one of the plural ultrasonic transmitting / receiving elements 20 arranged in a matrix. The ultrasonic transmission / reception element 20 can receive ultrasonic waves. In the ultrasonic transmission / reception sheet 100, for example, ultrasonic waves are transmitted from the ultrasonic transmission / reception element 20 located at the center, and ultrasonic waves reflected from the object are received by all the ultrasonic transmission / reception elements 20 arranged in a matrix. The distance from the ultrasonic transmission / reception sheet 100 to the object and the shape of the object can be detected by data processing of the phase difference of the ultrasonic waves received by each ultrasonic transmission / reception element 20.

  According to the ultrasonic transmission / reception element 20 of the embodiment described above, since the transmission / reception member 22 can adjust the reception sensitivity according to the degree of curvature, the transmission / reception member having good sensitivity to the frequency of the target ultrasonic wave. By setting and using the length L, the width W, the bending interval d, and the bending height h of 22, it is possible to have good sensitivity. In addition, the organic transistor 30 can be formed in a matrix form on the sheet by using a printing technique, and can be formed in a sheet form by connecting one end portion 24 which is a fixed end of the transmission / reception member 22 to be curved. Since the member 40 can also be connected and formed into a sheet shape, a plurality of the ultrasonic transmitting / receiving elements 20 of the embodiment can be easily arranged on a bendable sheet.

  According to the ultrasonic transmission / reception sheet 100 of the embodiment, the length L, the width W, the bending interval d, and the bending height h of the transmission / reception member 22 having good sensitivity to the frequency of the target ultrasonic wave are set. By using it, a plurality of ultrasonic transmitting / receiving elements 20 having good sensitivity can be arranged on a bendable sheet.

  In the ultrasonic transmission / reception element 20 and the ultrasonic transmission / reception sheet 100 of the embodiment, the transmission / reception member 22 and the transmission / reception unit sheet 120 are made of polyvinylidene fluoride, vinylidene fluoride / trifluoride ethylene copolymer, vinylidene fluoride / tetrafluoroethylene Polymer materials having a piezoelectric effect such as polymers, polyvinyl fluoride, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyacrylonitrile, vinylidene cyanide / vinyl acetate copolymer, vinylidene cyanide / vinyl benzoate copolymer, etc. However, the present invention is not limited to these polymer materials, and any material having a piezoelectric effect may be used.

  In the ultrasonic transmission / reception sheet 100 of the embodiment, 64 ultrasonic transmission / reception elements 20 are arranged in 8 rows and 8 columns, but a plurality of ultrasonic transmission / reception elements 20 are arranged in n rows and m columns (n and m are n and m are It is good also as what arrange | positions so that it may become (natural number), and may not arrange | position in a matrix form.

  In the ultrasonic transmission / reception element 20 and the ultrasonic transmission / reception sheet 100 of the embodiment, one end 24 of the transmission / reception member 22 is electrically connected to the electrode 38 of the drain 36 of the organic transistor 30. Since the source 34 and the drain 36 are structurally equivalent, one end 24 of the transmission / reception member 22 may be electrically connected to the electrode of the source 34 of the organic transistor 30.

  In the ultrasonic transmission / reception element 20 and the ultrasonic transmission / reception sheet 100 of the embodiment, the other end portion 26 of the transmission / reception member 22 is an open end. However, since the transmission / reception member 22 only needs to be curved, the other end portion 26 is also one end. It is good also as a fixed end similarly to the part 24. In this case, the direction of the curve is not limited to the concave upward (convex toward the organic transistor 30) as shown in FIG. A convex (concave toward the organic transistor 30) arch may be used.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  The present invention can be used in the manufacturing industry of ultrasonic transmission / reception elements and ultrasonic transmission / reception sheets.

It is a block diagram which shows the outline of a structure of the ultrasonic transmission / reception element 20 as one Example of this invention. It is a graph which shows the relationship between the bending space | interval d in the transmission / reception member 22 when the ultrasonic transmission / reception element 20 is irradiated with the ultrasonic wave of 40 kHz, the bending height h, and an output voltage. 4 is a graph showing the relationship between the width W of the transmission / reception member 22, the length L of the transmission / reception member 22 and the output voltage generated at the electrode 38 when the ultrasonic transmission / reception element 20 is irradiated with ultrasonic waves of 40 kHz. It is explanatory drawing which shows reception directivity when the ultrasonic wave transmission / reception element 20 of an Example receives ultrasonic waves. It is explanatory drawing which shows the transmission directivity when the ultrasonic wave is transmitted from the ultrasonic transmission / reception element 20 of an Example. It is explanatory drawing which shows an example of the specific example which used the ultrasonic transmission / reception element 20 of the Example as an ultrasonic transmission / reception element. It is explanatory drawing which shows the outline of a structure of the ultrasonic transmission / reception sheet | seat 100 of an Example. It is explanatory drawing which shows an example of the organic transistor sheet | seat 110. FIG. It is explanatory drawing which shows an example of the sheet | seat 120 for transmission / reception parts. It is explanatory drawing which shows an example of the sheet | seat 130 for curved parts.

Explanation of symbols

  20 ultrasonic transmitting / receiving element, 22 transmitting / receiving member, 24 one end, 26 other end, 30 organic transistor, 32 gate, 34 source, 36 drain, 38 electrode, 39 bonding, 40 bending member, 52 pulse transmitter, 54 receiver, 56 changeover switch, 100 ultrasonic transmission / reception sheet, 110 organic transistor sheet, 120 transmission / reception part sheet, 122 vertical connection part, 124 connection part, 126 horizontal connection part, 134 vertical connection part, 136 horizontal connection part, WL1 ˜WL8 Word line, BL1 to BL8 bit line.

Claims (7)

An ultrasonic transmitting / receiving element capable of transmitting and receiving ultrasonic waves,
An organic transistor,
A transmission / reception member formed into a rectangular thin plate shape by a polymer material having a piezoelectric effect, and having one end in the longitudinal direction electrically connected to one of the source and drain of the organic transistor and fixed in a cantilever manner When,
The transmitting / receiving member is disposed between the organic transistor and the transmitting / receiving member so as to be aligned with the other end in the longitudinal direction of the transmitting / receiving member, and the transmitting / receiving member is curved by pushing the other end away from the organic transistor. A bending member;
An ultrasonic transmission / reception element comprising:   The ultrasonic transmission / reception element according to claim 1, wherein the transmission / reception member is made of any one of polyvinylidene fluoride, vinylidene fluoride / trifluorinated ethylene copolymer, and vinylidene fluoride / tetrafluoroethylene copolymer. . The bending member pushes the other end portion from the organic transistor by a predetermined ratio centered on 0.8 with respect to the interval between the contact portion of the transmitting / receiving member and the fixed portion of the transmitting / receiving member. The ultrasonic transmission / reception element according to claim 1 or 2 formed so as to be separated. A transmission / reception unit formed in a rectangular shape by a polymer material having a piezoelectric effect and capable of transmitting and receiving ultrasonic waves, and an organic transistor in which one source or drain electrode is electrically connected to one end of the transmission / reception unit An ultrasonic transmission / reception sheet comprising a plurality of ultrasonic transmission / reception elements arranged on a bendable sheet,
An organic transistor sheet formed by arranging a plurality of the organic transistors on a bendable sheet;
A plurality of transmission / reception units are arranged at positions where one end of the transmission / reception unit is aligned with one electrode of the source or drain of each organic transistor in the organic transistor sheet when stacked on the organic transistor sheet, A transmission / reception unit sheet formed by connecting the one end of the transmission / reception unit;
When the organic transistor sheet and the transmission / reception unit sheet are arranged and joined, the other end of the plurality of transmission / reception units in the transmission / reception unit sheet is pushed away from the organic transistor sheet. A bending part sheet in which a plurality of bending parts for bending a plurality of transmission / reception units are formed;
The organic transistor sheet, the bending portion sheet, and the transmission / reception unit sheet in this order, the one electrode of each organic transistor in the organic transistor sheet and the one end of each transmission / reception unit in the transmission / reception unit sheet It is joined to be electrically connected and fixed.
Ultrasonic transmission / reception sheet.   The transmission / reception unit sheet is formed by punching a thin plate member made of any one of polyvinylidene fluoride, vinylidene fluoride / trifluoroethylene copolymer, and vinylidene fluoride / tetrafluoroethylene copolymer. The ultrasonic transmission / reception sheet according to claim 4.   Each bending part in the bending part sheet is a predetermined ratio centered on 0.8 with respect to the interval between the contact part of each transmission / reception part and the fixed part of the transmission / reception part in the transmission / reception part sheet. The ultrasonic transmission / reception sheet according to claim 4, wherein the other end is pushed away from the organic transistor sheet. The ultrasonic transmission / reception sheet according to any one of claims 4 to 6, wherein the plurality of ultrasonic transmission / reception elements are arranged in a matrix.