WO2013084911A1 - 超音波トランスデューサーおよび重送検知用センサ - Google Patents
超音波トランスデューサーおよび重送検知用センサ Download PDFInfo
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- WO2013084911A1 WO2013084911A1 PCT/JP2012/081455 JP2012081455W WO2013084911A1 WO 2013084911 A1 WO2013084911 A1 WO 2013084911A1 JP 2012081455 W JP2012081455 W JP 2012081455W WO 2013084911 A1 WO2013084911 A1 WO 2013084911A1
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- ultrasonic transducer
- signal potential
- vibrator
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- 238000001514 detection method Methods 0.000 title claims description 66
- 230000005540 biological transmission Effects 0.000 claims description 6
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- 230000003321 amplification Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
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- 238000007639 printing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
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- 239000003822 epoxy resin Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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- 230000005484 gravity Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
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- 238000005304 joining Methods 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
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- 229920001187 thermosetting polymer Polymers 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
- B06B1/0611—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/50—Piezoelectric or electrostrictive devices having a stacked or multilayer structure
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/87—Electrodes or interconnections, e.g. leads or terminals
- H10N30/875—Further connection or lead arrangements, e.g. flexible wiring boards, terminal pins
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/88—Mounts; Supports; Enclosures; Casings
Definitions
- the present invention relates to an ultrasonic transducer including a vibrator that vibrates in the thickness direction in the stacking direction of an electrode layer and a piezoelectric layer.
- the present invention also relates to a double feed detection sensor including an ultrasonic transducer.
- the ultrasonic transducer includes a vibrator for transmitting or receiving a sound wave.
- a general vibrator is configured such that an electrode layer and a piezoelectric layer are laminated to cause area vibration, and the vibration of the vibrator causes vibration between the vibrator and the other member by joining the vibrator and the other member. It is comprised so that it may convert into a bending vibration (for example, refer patent document 1).
- An ultrasonic transducer including such a vibrator may be used as a double feed detection sensor for detecting double feed of a sheet by a printing machine or the like.
- the double feed detection sensor uses absorption and reflection of sound waves on an extremely thin sheet, so that the ultrasonic transducer for transmission and the ultrasonic transducer for reception face each other with the paper conveyance path in between. Are arranged at intervals of several cm or less. For this reason, when the ultrasonic transducer on the transmission side is driven, electrostatic coupling noise is superimposed on the detection signal of the ultrasonic transducer on the reception side due to the stray capacitance between the two ultrasonic transducers.
- FIG. 5A is a diagram illustrating a detection signal in which electrostatic coupling noise is superimposed in a single-feed state of a sheet in a conventional double-feed detection sensor.
- FIG. 5B is a diagram illustrating a detection signal in which electrostatic coupling noise is superimposed in a double feed state of a sheet in a conventional double feed detection sensor.
- the detection of the double feed state of the paper by the double feed detection sensor is performed by comparing the difference between the detection signal level at the time of single paper feed and the detection signal level at the time of paper double feed, and is thus superimposed on the detection signal. If the electrostatic coupling noise is large, erroneous detection is likely to occur at the time of paper double feeding, and the electrostatic coupling noise must be at least smaller than the detection signal level at the time of single paper feeding.
- each of the transmitting ultrasonic transducer and the receiving ultrasonic transducer is used.
- a shield case is provided to cover the side surface of the vibrator excluding the sound wave transmitting / receiving surface.
- the installation of the shield case increases the cost of the ultrasonic transducer and the multifeed detection sensor and complicates the manufacturing process. It becomes a factor of. Therefore, an ultrasonic transducer having high noise resistance is desired without providing a shield case.
- the double feed detection sensor uses absorption and reflection of sound waves on an extremely thin sheet, it is necessary to use sound waves in a higher frequency band than sensors for other applications.
- the ultrasonic transducer according to the conventional example is downsized as it is, the vibration area at the center of the vibration surface is significantly reduced. It is unavoidable that the sound wave characteristics are deteriorated.
- unnecessary vibration occurs at a frequency near the resonance frequency, and when the resonance frequency shifts due to material variation or the like, the sound wave characteristic is deteriorated due to the influence of the unnecessary vibration.
- an object of the present invention is a structure suitable for use in a high frequency band, an ultrasonic transducer capable of suppressing the influence of electrostatic coupling noise, and double feed detection using the ultrasonic transducer.
- a sensor is a structure suitable for use in a high frequency band, an ultrasonic transducer capable of suppressing the influence of electrostatic coupling noise, and double feed detection using the ultrasonic transducer.
- the ultrasonic transducer of the present invention includes a vibrator, a signal potential connection terminal, a reference potential connection terminal, a signal potential connection portion, and a reference potential connection portion.
- the vibrator is formed by alternately laminating piezoelectric layers having an even number of layers and electrode layers having an odd number of layers, with the electrode layers serving as outermost layers, and vibrate in the thickness direction.
- the signal potential connection terminal is a terminal connected to the signal potential.
- the reference potential connection terminal is a terminal connected to the reference potential.
- the signal potential connection portion is connected to the even-numbered electrode layers in the arrangement order of the electrode layers, and is connected to the signal potential connection terminal.
- the reference potential connection portion is connected to an odd-numbered electrode layer in the arrangement order of the electrode layers, and is connected to a reference potential connection terminal.
- the ultrasonic transducer includes a shield case that covers a side surface that intersects the main surface located in the stacking direction of the transducers and is connected to a reference potential.
- the multifeed detection sensor includes a wave transmitting section and a wave receiving section that are arranged with an interval therebetween so as to face each other with a sheet conveyance path therebetween, and the wave transmitting section and the wave receiving section At least one of them includes the above-described ultrasonic transducer.
- the double feed detection sensor of the present invention includes a wave transmitting section and a wave receiving section that are arranged at an interval so as to face each other with the paper conveyance path interposed therebetween,
- the above-described ultrasonic transducer is provided as a first ultrasonic transducer connected to the first signal potential and the reference potential, and the wave receiving unit is a second signal potential connected to the second signal potential.
- a second ultrasonic transducer having a connection terminal and a third signal potential connection terminal connected to a third signal potential having a waveform opposite in polarity to the second signal potential; and a second signal A differential amplifier circuit that is connected to the potential connection terminal and the third signal potential connection terminal and that differentially amplifies the second signal potential and the third signal potential;
- the double feed detection sensor using the above-described ultrasonic transducer, it is possible to improve the detection accuracy of the state where the paper is being double fed. If both the wave transmitting unit and the wave receiving unit are provided with the above-described ultrasonic transducer, it is possible to extremely increase the detection accuracy of the state in which the sheets are being multi-fed. In addition, even when only the transmission unit includes the ultrasonic transducer having high noise resistance as described above, differential amplification that differentially amplifies two signal potentials having opposite waveforms in the reception unit If a circuit is provided, common mode noise can be canceled and detection accuracy of a double feed state can be extremely increased.
- the vibrator since the vibrator vibrates in thickness, the entire vibration surface of the vibrator is displaced (vibrated) almost uniformly in the thickness direction, so that no vibration node is generated on the vibration surface, and high vibration efficiency is achieved. Can be realized. Therefore, even if the ultrasonic transducer is downsized, it is difficult for the sound pressure and sensitivity to decrease.
- the electrode layer which is the outermost layer in the stacking direction is connected to the reference potential, the influence of electrostatic coupling noise can be suppressed. It is possible to realize high detection accuracy in a state where paper is being double fed by using the double feed detection sensor.
- FIG. 1A is a perspective view of the vibrator 11 according to the present embodiment.
- 1A is the direction in which ultrasonic waves are transmitted and received, and is the front direction of the vibrator 11.
- the vibrator 11 has a columnar shape with a square front and back, and includes a matching layer 11A and a piezoelectric element layer 11B.
- the shape of the front surface and the back surface of the vibrator 11 is preferably a square or a circle because vibration efficiency can be increased and unnecessary vibration can be prevented.
- a shape such as a rectangle or an oval may be used to control the directivity of the sound wave.
- the matching layer 11A is made of a low specific gravity material in which a glass balloon is mixed with an epoxy resin that can be bonded by potting and thermosetting, and is positioned on the front side of the vibrator 11.
- the matching layer 11A is provided to match the acoustic impedance between the piezoelectric element layer 11B and the outside (outside air).
- the piezoelectric element layer 11B is located on the back side of the vibrator 11, and a total of four piezoelectric layers 11C1 to 11C4 and a total of five electrode layers 11D1 to 11D5 with the direction between the front and the back as the stacking direction, Are stacked alternately from the back side to the front side.
- the electrode layer 11D1 is the outermost layer on the back side of the vibrator 11, and the electrode layer 11D5 is the outermost layer on the front side of the vibrator 11.
- the electrode layer 11D2 is disposed between the piezoelectric layer 11C1 and the piezoelectric layer 11C2.
- the electrode layer 11D3 is disposed between the piezoelectric layer 11C2 and the piezoelectric layer 11C3.
- the electrode layer 11D4 is disposed between the piezoelectric layer 11C3 and the piezoelectric layer 11C4.
- the piezoelectric layers 11C1 to 11C4 are made of a lead zirconate titanate ceramic having a large electromechanical coupling coefficient and piezoelectric d constant and a small mechanical quality coefficient.
- FIG. 1B is a side view of the ultrasonic transducer 1 according to the present embodiment.
- FIG. 1C is a cross-sectional view of the ultrasonic transducer 1.
- the upward direction in the drawing is the direction in which ultrasonic waves are transmitted and received, and the front direction of the ultrasonic transducer 1.
- the ultrasonic transducer 1 includes a metal cover 2, a resin case 3, a vibrator 11, and metal terminals 5, 6, and 7.
- the metal cover 2 is made of a conductive metal material and has a cylindrical shape with an open front and back.
- the metal cover 2 holds the resin case 3 and functions as an electromagnetic shield for the side direction of the ultrasonic transducer 1.
- the metal terminal 7 is formed integrally with the metal cover 2 and extends from the metal cover 2 in the rear direction.
- the metal terminal 7 is connected to the ground potential. Thereby, the metal cover 2 is connected to the ground potential.
- the resin case 3 is formed by injection molding of a plastic resin and has a bottomed cylindrical shape with an opening on the front side.
- the resin case 3 is formed so that the outer dimension is mainly equal to the inner dimension of the metal cover 2, and a step portion 3 ⁇ / b> D is formed on the outer surface near the back surface.
- the step portion 3 ⁇ / b> D comes into contact with a part of the metal cover 2 to lock the metal cover 2. Note that a groove through which the metal terminal 7 passes is formed in the step portion 3D.
- the resin case 3 is provided with a rectangular opening 3A on the front surface.
- the opening 3A is where the vibrator 11 is inserted.
- the resin case 3 is provided with a rectangular hole 3B on the back surface.
- the hole 3B communicates with the inner bottom surface of the opening 3A, and the rear side ends of the metal terminals 5 and 6 are inserted therein.
- a groove 3C extending from the hole 3B along the inner bottom surface and the inner wall surface is formed in the opening 3A.
- the groove 3 ⁇ / b> C is for locking the metal terminals 5 and 6.
- the opening 3 ⁇ / b> A is formed so that the inner wall surface is in elastic contact with the outer wall surface of the vibrator 11 except for the formation region of the groove 3 ⁇ / b> C.
- the distance from the front surface to the inner bottom surface is set to be shallower than the thickness dimension of the vibrator 11.
- the metal terminals 5 and 6 are made of a conductive metal material.
- the metal terminal 5 is connected to the ground potential (reference potential) and corresponds to the reference potential terminal.
- the metal terminal 6 is connected to a signal potential and corresponds to a signal potential terminal.
- the metal terminals 5 and 6 are substantially rod-shaped members, and are provided with stepped portions by being bent twice near the center.
- the ends and step portions on the front side of the step portions of the metal terminals 5 and 6 are fitted into the groove 3C of the resin case 3 and are provided inside the opening portion 3A.
- the end on the back side of the stepped portions of the metal terminals 5 and 6 is provided to protrude from the hole 3B to the back side.
- the front end of the metal terminals 5 and 6 is narrowed between the side surface of the vibrator 11 and the inner wall surface of the resin case 3 in the opening 3A of the resin case 3, and protrudes toward the vibrator 11 at the center. A bow-shaped part that bends is formed.
- the metal terminals 5 and 6 are always in contact with the vibrator 11 by elastically deforming this part.
- the metal terminals 5 and 6 may be bonded to the side surface of the vibrator 11 by using a conductive adhesive or the like. Further, the vibrator 11 may be adhered to the inner bottom surface of the resin case 3 using an insulating adhesive or the like.
- connection portion 8 is electrically connected to the odd-numbered electrode layers 11D1, 11D3, and 11D5, and makes the odd-numbered electrode layers 11D1, 11D3, and 11D5 conductive to the metal terminal 5 by contacting the metal terminal 5.
- connection portion 9 is electrically connected to the even-numbered electrode layers 11D2 and 11D4 and is brought into contact with the metal terminal 6, thereby electrically connecting the even-numbered electrode layers 11D2 and 11D4 to the metal terminal 6.
- the connection portion 8 corresponds to a reference potential connection portion.
- the connection portion 9 corresponds to a signal potential connection portion.
- the polarization directions of the odd-numbered piezoelectric layers 11C1 and 11C3 and the even-numbered piezoelectric layers 11C2 and 11C4 are set to be opposite to each other. If the polarization direction is set in this way, the thickness vibrations of the piezoelectric layers 11C1 to 11C4 are accumulated, and the vibration efficiency of the vibrator 11 as a whole can be maximized.
- the vibrator 11 is configured to vibrate in thickness along the direction between the front surface and the back surface, and the entire front surface of the vibrator 11 is a vibration region. Therefore, even if the vibrator 11 is small, the resonance frequency Changes, sound pressure and sensitivity are unlikely to occur. Therefore, favorable ultrasonic characteristics can be realized as the ultrasonic transducer 1. Further, since the vibrator 11 has a part of the matching layer 11A and the piezoelectric element layer 11B disposed inside the opening 3A of the resin case 3, it is not easily affected by external impacts and has high durability performance. realizable.
- the piezoelectric layers 11C1 to 11C4 are sandwiched on both sides in the stacking direction by the outermost electrode layers 11D1 and 11D5 which are electrically connected to the metal terminal 5 which is the reference potential connection terminal, the piezoelectric layers 11C1 to 11C4 The influence of electromagnetic noise from the stacking direction is difficult to reach. Further, the metal cover 2 surrounding the side surface of the resin case 3 makes it difficult for the piezoelectric layers 11C1 to 11C4 to be affected by electromagnetic noise from the side surface direction. Therefore, the vibrator 11 and the ultrasonic transducer 1 have extremely high noise resistance.
- FIG. 2 is a conceptual diagram of the double feed detection sensor 101 using the ultrasonic transducer according to the first embodiment of the present invention.
- the two ultrasonic transducers 1A and 1B are arranged at an interval so as to face each other with the paper transport path 111 in the printing machine or the like interposed therebetween.
- the ultrasonic transducers 1A and 1B have the same configuration as the ultrasonic transducer 1, and detailed description thereof is omitted here.
- the double feed detection sensor 101 includes ultrasonic transducers 1A and 1B, an oscillator 102, an amplifier 103, and an oscilloscope 104.
- the ultrasonic transducer 1A is an ultrasonic transducer for transmitting waves
- the ultrasonic transducer 1B is an ultrasonic transducer for receiving waves.
- the oscillator 102 is connected to the metal terminal 6 of the ultrasonic transducer 1A.
- the oscilloscope 104 is connected to the metal terminal 6 of the ultrasonic transducer 1B.
- the amplifier 103 is connected between the ultrasonic transducer 1B and the oscilloscope 104.
- the metal terminals 5 and 7 of the ultrasonic transducers 1A and 1B are connected to the ground potential.
- the arrangement interval between the ultrasonic transducer 1A and the ultrasonic transducer 1B is several cm or less.
- the ultrasonic transducer 1A and the oscillator 102 correspond to a wave transmission unit.
- the ultrasonic transducer 1B, the oscilloscope 104, and the amplifier 103 correspond to a wave receiving unit.
- the oscillator 102 oscillates a frequency pulse signal for driving the ultrasonic transducer 1A.
- the ultrasonic transducer 1 ⁇ / b> A receives the frequency pulse signal and transmits an ultrasonic pulse of 100 kHz or more to the paper conveyance path 111.
- Ultrasonic pulses of 100 kHz or higher are suitable for detecting the multi-feed state for various thicknesses and types of paper.
- the ultrasonic pulse passes through the conveyed paper and reaches the ultrasonic transducer 1B. At this time, if the paper is in a double feed state, the attenuation of the sound wave is remarkably increased.
- the ultrasonic transducer 1B receives an ultrasonic pulse and outputs a detection signal.
- the amplifier 103 amplifies the detection signal input from the ultrasonic transducer 1B.
- the oscilloscope 104 determines from the detection signal amplified by the amplifier 103 that if the attenuation of the sound wave is remarkably large, it is determined that the paper is being multi-fed in the paper conveyance path 111; It is determined that it has been sent.
- the ultrasonic transducer 1A for transmitting and the ultrasonic transducer 1B for receiving the wave are arranged at an extremely narrow interval, so that the ultrasonic transducers 1A and 1B are disposed. If the metal terminal 5 connected to the outermost electrode layer is not connected to the ground potential, there is a risk of being affected by electrostatic coupling noise.
- FIG. 3A is a test in which the noise level is confirmed for a double feed detection sensor that is a target configuration of the present embodiment and a multifeed detection sensor that uses a conventional ultrasonic transducer that is a comparative configuration. It is a figure which shows a result.
- a shield case is not provided for either the transmitting or receiving ultrasonic transducer, and a shield case is provided only for the transmitting ultrasonic transducer.
- the noise level was confirmed when the shield case was provided only for the ultrasonic transducer for receiving waves and when the shield case was provided for both the transmitting and receiving ultrasonic transducers.
- the noise detection level of the target double feed detection sensor is lower than that of the comparative configuration double feed detection sensor if the shield case is in the same state.
- the double feed detection sensor of the target configuration is more than the detection signal level when the Kent paper is single-fed.
- the noise level was low, in the double feed detection sensor of the comparative configuration, the noise level was higher than the detection signal level when the Kent paper was single-fed.
- the double feed detection sensor of the comparison configuration there is a possibility that the state where the paper is double fed due to the electrostatic coupling noise may be erroneously detected as the paper is being single fed. It can be said that the occurrence of such erroneous detection can be suppressed or prevented with the double feed detection sensor.
- connection to the reference potential of the metal terminal 5 of the ultrasonic transducer and the connection to the signal potential of the metal terminal 6 were normally performed on the double feed detection sensor of the present embodiment. It is a figure which shows the test result which confirmed the noise level about the case and the case where the connection of the metal terminal 5 and the metal terminal 6 was reversed.
- the test is performed with the ultrasonic transducers for transmitting and receiving waves without a shield case.
- the noise level was the same as that of the target configuration shown in FIG.
- the noise level was deteriorated.
- the noise level was significantly deteriorated.
- both the transmitting and receiving ultrasonic transducers have the configuration shown in the present embodiment, but at least of the transmitting and receiving ultrasonic transducers. If one side is the structure of this embodiment, it turns out that a noise level falls rather than the case where both differ from the structure of this embodiment.
- the double-feed detection sensor adopting the configuration of the present embodiment for both the transmitting and receiving ultrasonic transducers, but at least for transmitting and receiving waves.
- the detection accuracy in a state where the paper is being double fed can be improved. Therefore, for example, even if only one ultrasonic transducer has the configuration of the present embodiment and the other ultrasonic transducer has a configuration different from the configuration of the present embodiment, a shield case can be provided on the other ultrasonic transducer. For example, it is considered that it is possible to sufficiently suppress erroneous detection due to electrostatic coupling noise in the double feed detection sensor.
- FIG. 4 is a conceptual diagram of the double feed detection sensor 121 according to the second embodiment of the present invention.
- the double feed detection sensor 121 according to the present embodiment has a configuration in which two ultrasonic transducers 1 ⁇ / b> A and 121 ⁇ / b> B are disposed to face both surfaces of the paper transport path 111.
- the ultrasonic transducer 121B has almost the same mechanical structure as the ultrasonic transducer 1B shown in the first embodiment, but has a different terminal connection.
- the ultrasonic transducer 121B includes two signal potential connection terminals 125 and 126 that output two signal potentials whose waveforms are opposite in polarity.
- the signal potential connection terminal 125 is connected to the even-numbered (or odd-numbered) electrode layer of the vibrator.
- the signal potential connection terminal 126 is connected to the odd-numbered (or even-numbered) electrode layer of the vibrator.
- the ultrasonic transducer 121B is provided with a reference potential connection terminal 127 that is electrically independent from the signal potential connection terminals 125 and 126 and connects the shield case to the ground potential (reference potential).
- the ultrasonic transducer 121B is connected to the oscilloscope 104 via a differential amplifier circuit 123.
- the differential amplifier circuit 123 includes two operational amplifiers 128 and 129.
- the operational amplifier 128 has a + input terminal connected to the signal potential connection terminal 125 and a ⁇ input terminal connected to the ground potential (reference potential).
- the operational amplifier 129 has a + input terminal connected to the signal potential connection terminal 126 and a ⁇ input terminal connected to the ground potential (reference potential).
- the first signal potential and the second signal potential output from the ultrasonic transducer 121 ⁇ / b> B are amplified by the operational amplifiers 128 and 129 while their waveforms are reversed in polarity, and output from the differential amplifier circuit 123 to the oscilloscope 104. Is done. Since the waveforms of the first signal potential and the second signal potential have opposite polarities, the balanced output from the operational amplifiers 128 and 129 is obtained by differentially amplifying the first signal potential and the second signal
- the present invention can be implemented, but the ultrasonic transducer of the present invention can also be used in other devices for double feed detection sensors. Further, the specific configuration and material of the vibrator and the ultrasonic transducer are not limited as long as the electrode layer located at the outermost layer in the piezoelectric element portion of the ultrasonic transducer is connected to the reference potential. It may be a thing.
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Abstract
Description
まず、本発明の第1の実施形態に係る超音波トランスデューサーおよび振動子の構成について、図1に基づいて説明する。
超音波トランスデューサー1Aと発振器102とは、送波部に相当する。超音波トランスデューサー1Bとオシロスコープ104と増幅器103とは、受波部に相当する。
図4は、本発明の第2の実施形態に係る重送検知用センサ121の概念図である。本実施形態の重送検知用センサ121は、2つの超音波トランスデューサー1A,121Bを用紙搬送路111の両面それぞれに対向させて配置させる構成である。超音波トランスデューサー121Bは、第1の実施形態に示した超音波トランスデューサー1Bとほとんど同じ機械的構造を持つが、端子接続が相違するものである。
2…金属カバー
3…樹脂ケース
3A…開口部
3B…孔
3C…溝
3D…段部
5,6,7…金属端子
8,9…接続部
11…振動子
11A…整合層
11B…圧電素子層
11C1~11C4…圧電体層
11D1~11D5…電極層
101,121…重送検知用センサ
102…発振器
103…増幅器
104…オシロスコープ
111…用紙搬送路
123…差動増幅回路
125,126…信号電位接続端子
127…基準電位接続端子
128,129…オペアンプ
Claims (4)
- 層数が偶数である圧電体層と層数が奇数である電極層とを前記電極層を最外層として交互に積層してなり、積層方向に厚み振動する振動子と、
信号電位に接続される端子である信号電位接続端子と、
基準電位に接続される端子である基準電位接続端子と、
前記電極層の配置順で偶数番目の前記電極層に接続されているとともに、前記信号電位接続端子に接続されている信号電位接続部と、
前記電極層の配置順で奇数番目の前記電極層に接続されているとともに、前記基準電位接続端子に接続されている基準電位接続部と、
を備える超音波トランスデューサー。 - 前記振動子の積層方向に位置する主面に交差する側面を覆い、前記基準電位に接続されるシールドケースを備える、請求項1に記載の超音波トランスデューサー。
- 用紙搬送路を間に介して対向するように間隔を隔てて配置されている送波部と受波部とを備えていて、
前記送波部と前記受波部の少なくとも一方は、請求項1または2に記載の超音波トランスデューサーを備えている、重送検知用センサ。 - 用紙搬送路を間に介して対向するように間隔を隔てて配置されている送波部と受波部とを備えていて、
前記送波部は、請求項1または2に記載の超音波トランスデューサーを、第1の信号電位と基準電位とに接続される第1の超音波トランスデューサーとして備え、
前記受波部は、
第2の信号電位に接続される第2の信号電位接続端子と、第2の信号電位とは波形が逆極性である第3の信号電位に接続される第3の信号電位接続端子と、を有する第2の超音波トランスデューサーと、
前記第2の信号電位接続端子と前記第3の信号電位接続端子とに接続されていて、前記第2の信号電位と前記第3の信号電位とを差動増幅する差動増幅回路と、を備えている、
重送検知用センサ。
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WO2016085014A1 (ko) * | 2014-11-28 | 2016-06-02 | 알피니언메디칼시스템 주식회사 | 다계층 초음파 트랜스듀서 및 그 제조방법 |
JP2021030517A (ja) * | 2019-08-21 | 2021-03-01 | コニカミノルタ株式会社 | 画像形成装置 |
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JP7211211B2 (ja) * | 2019-03-29 | 2023-01-24 | コニカミノルタ株式会社 | シート搬送装置、画像読み取り装置および画像形成装置 |
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