• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A piezo-electric transducer, such as, a bi-morph leaf, comprised of a pair of piezo-electric elements which are oppositely poled in opposite directions and interposed between inner and outer electrodes with each element being bonded to the other at the respective inner electrodes, is provided with a drive circuit applying a drive voltage across the outer electrodes, one of which is desirably grounded, for deflecting the transducer, and which clamps the voltage at the bonded together inner electrodes to a relatively small maximum value at least in response to a polarity of the drive voltage opposed to the direction in which one of the piezo-electric elements is poled so as to avoid substantial depolarization of at least that one element. The foregoing arrangement is particularly desirable in an apparatus in which a magnetic head is moved along a track on a magnetic tape or other record medium for reproducing information signals recorded in such track which the bi-morph leaf supports the head for deflecting the latter in a direction transverse to that along the track in response to the drive voltage.
    公开号:SU1367845A3
    申请号:SU782703352
    申请日:1978-12-28
    公开日:1988-01-15
    发明作者:Сакамото Хитоси
    申请人:Сони Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

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     CM
    The invention relates to radio engineering, in particular, to devices for reproducing video signals or other information signals recorded on a nose: video recorder, in particular a magnetic tape.
    The aim of the invention is to improve the reliability of the device by simplifying the voltage limiter circuit and reducing the interference signal.
    The drawing schematically shows the proposed device.
    The device for reproducing information signals contains a reading head 1 mounted on the end of a cantilever bimorph plate 2, which is made of two oppositely polarized piezoelectric elements 3 and 4 (polarization directions are shown by arrows 5 and 6), and these elements are located between the common internal 7 and external 8, 9 electrodes, respectively, specifying the circuit and the limiting circuit. In the driver circuit, the source voltage driver AC is connected on one side to the ground bus 11, while the other side is connected to the external electrode 8 of the bimorph plate 2. The other external electrode 9 of the plate 2 is connected to the ground bus 12, for example , through the structure 13, to which one end of the plate 2 is attached. Since the external electrode 9 is grounded, the reading head 1, for example, for reproducing video signals can be attached directly and directly to the free end of the plate 2 on its external electrode 9, since in this case mutual interference between the video or other information signals reproduced by the head 1. And the reference signal supplied to the plate 2 for its bending does not occur. The limiting circuit comprises a diode 14 and a zener diode 15 (for example, a Zener diode) connected in series and connected between the inner 7 and external 8 electrodes as well as a diode 16 and a zener diode 17 (for example, a Zener diode) connected in series and connected between the internal electrode 7 and the external electrode 9 or the earth bus 12. The diodes 14, 16 are arranged in such a way as to conduct current in directions in which the elements 4,3 are polarized
    five
    5 0 0 5 0 5 0 5
    respectively. Preferably, when using Zener diodes as zener diodes 15 and 17, these diodes would have a Zener voltage V.J, i.e. between 1/3 E and 1/2 E, where EU, o, kc is the maximum value of the voltage that can be applied to elements 3 and 4 in the direction in which they are polarized, to create a virtually linear relationship between the resulting bend and the value of the applied voltage.
    With a relatively small maximum value of the voltage on the electrode 7, at least depending on the polarity of the drive voltage from the source 10, which is opposite to the direction in which one of the piezoelectric elements 3 or 4 is polarized, the limiting circuit eliminates a significant drop provision of at least one of these elements. In the case where the driver, the voltage from the source 10 is the alternating current voltage, the limiting circuit allows to eliminate the significant depolarization on both elements 4 and 3.
    Diodes 14 and 16, as well. Zener diodes 15 and 17, used as zener diodes, act as a voltage divider so that if the driving voltage from source 10 is ± E, the voltage is + 1 / 2E and is applied to each of the piezoelectric elements 3 and 4. When such a voltage is lower than the Zener voltage Y ", i.e. + E + 2V, then each of the Zener diodes 15, 17 is in the off position so that the bimorph plate 2 is energized by the voltage + E. If the driving voltage + E is higher than ± 2V, then one or the other of the Zener diodes 15, 17 begins to conduct or is turned on so that the voltage of the conducting Zener diode is limited at iV. When the drive voltage is + E + 2V, the diode 14 is biased so that the Zener diode 15 is in its off position, while the diode 16 is biased directly, resulting in the Zener diode 17 in its on position. Consequently, the voltage at the junction point between the Zener diodes 15, 17 is limited at V. Although the voltage applied to the piezoelectric element 4 is opposite to the direction of its polarization, the described limitation ensures that the voltage is kept constant small value. At the same time, the voltage (E-V is applied to the piezoelectric element 3 in the direction of polarization of the latter in order to bend upward the bimorph plate 2,
    When the driving voltage is -E-2, then the diode 16 is biased back, and the Zener diode 17 is in its off position, while the diode 14 is biased directly, and the Zener diode 15 is in its on position. Consequently, a constant relatively low voltage V, which is opposite to the direction of polarization of element 3, is applied to the latter, and voltage (E-V) is applied to another element 4 to bend down the bimorph plate 2.
    Note that the sensitivity of the deflecting system of the bimorph plate 2 is constant, regardless of the value of the drive voltage. In particular, when the absolute value of the drive voltage E is lower than 2V, the voltage 1 / 2E is applied to each of the elements 3.4. Therefore, the resulting deviation of the bimorph plate 2 corresponds to the absolute value E of the driving voltage. When the absolute value of the voltage E is higher than 2V, the Zener voltage is applied to one of the elements 3, 4, and the voltage (E-Vj) is applied to the other of the element plates. Therefore, one of the elements 3.4 is bent in accordance with the voltage V, while the other with the voltage (E-V) so that the total deviation of the bimorph plate 2 corresponds to the voltage E.
    In addition, since the Zenerov voltage V has a relatively low value, for example, between 1 / 3Ej, a, and 1 / 2E „, then its feed
    on elements 3 or 4 in 1 direction, opposite to the direction of polarization of these elements, will not lead to
    any significant depolarization of this element.
    If one of the polarities of the ac voltage setting from source 10 is actually a limited absolute value, then from the limiting circuit you can exclude either a circuit from a series-connected diode 14 and a zener diode 15, or a chain of a series-connected diode 16
     and zener diode 17.,
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    Playback device
    the information signals recorded on the track of the recording medium, comprising a read head mounted on the end of a cantilever bimorph plate with the possibility of moving perpendicular to the direction of the track of the recording medium, in which the bimorph plate is made of two oppositely polarized piezoelectric elements, each of
    which is located between the common internal and external electrodes connected to the control voltage source, and a voltage suppressor, characterized in that, in order to increase reliability by simplifying the voltage limiter circuit and reducing the interference signal, the voltage suppressor is
    voltage divider associated with
    external electrodes and having a midpoint connected to the internal electrode of the bimorph plate, and each of the branches of the divider for example
    a one-way conductor opposite to the direction of polarization of the piezoelectric elements, contains a series-connected diode and a zener diode, with
    This external electrode, on the side of which a reading head is mounted on a bimorph plate, is connected to the ground.
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1367845A3|1988-01-15|Device for reproducing information signals recorded on recording medium track
    US4594526A|1986-06-10|Bimorph electromechanical transducer and control circuit device therefor
    US4410918A|1983-10-18|Helical scan VTR with deflectable head
    CA1111959A|1981-11-03|Tracking-error correcting system for use with record medium scanning apparatus
    US4169276A|1979-09-25|Drive circuit for controlling a movable magnetic head
    CA1119293A|1982-03-02|Video signal reproducing system
    US4203140A|1980-05-13|Helical scan VTR with deflectable head
    EP0032834B1|1984-01-25|A positionable element driving circuit
    US4164781A|1979-08-14|Track servoing system using signals from tunnel erase heads
    US4438469A|1984-03-20|Deflectable transducer mounting assembly
    US4072883A|1978-02-07|Bi-directional motor drive servo
    US4326228A|1982-04-20|Magnetic transducer supporting apparatus
    EP0223825B1|1991-07-10|Unambiguously tracking a data track in response to signals derived from the track data itself
    US4720753A|1988-01-19|Auto tracking apparatus for scanning tracks with controllable head displacement
    US3810236A|1974-05-07|Data recording and verification system
    US3526899A|1970-09-01|Magneto-acoustic transducer for high track density recording
    US5036419A|1991-07-30|Electro-mechanical transducing element and a moving device using the same
    EP0128623B1|1988-05-25|Apparatus for recording and reproducing information on a record carrier in the form of a tape
    US3855629A|1974-12-17|Combined magnetic head for recording and playback having adjustable end faces
    SU1265840A1|1986-10-23|Device for controlling displacement of video head in autotracking system
    GB1455480A|1976-11-10|Multitrack magnetic read/write heads
    SU726580A1|1980-04-05|Tape-driving mechanism
    US4455581A|1984-06-19|Self-correcting record-play system and method
    SU1614033A1|1990-12-15|Device for moving magnetic head relative to moving tape
    GB1142993A|1969-02-12|Improvements in or relating to magnet head arrangements
    同族专利:
    公开号 | 公开日
    ATA936778A|1983-10-15|
    FR2413840A1|1979-07-27|
    IT7831422D0|1978-12-29|
    BR7808536A|1979-07-10|
    CH626764A5|1981-11-30|
    GB2011734A|1979-07-11|
    DE2856508A1|1979-07-12|
    US4237399A|1980-12-02|
    DE2856508C2|1993-07-29|
    IT1101699B|1985-10-07|
    NL191375C|1995-06-16|
    JPS6123569B2|1986-06-06|
    DK584878A|1979-06-30|
    SE438222B|1985-04-01|
    AT374940B|1984-06-12|
    SE7813380L|1979-06-30|
    DK153608C|1989-01-02|
    GB2011734B|1982-08-18|
    DK153608B|1988-08-01|
    NL191375B|1995-01-16|
    JPS5492307A|1979-07-21|
    AU4226078A|1979-07-05|
    AU523309B2|1982-07-22|
    NL7812079A|1979-07-03|
    ES476411A1|1979-11-16|
    FR2413840B1|1985-11-22|
    CA1132707A|1982-09-28|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP52158187A|JPS6123569B2|1977-12-29|1977-12-29|
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