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    3.
    发明专利
    未知

    公开(公告)号：FR2613867A1

    公开(公告)日：1988-10-14

    申请号：FR8804242

    申请日：1988-03-28

    Applicant: YAMAHA CORP

    Inventor： IIJIMA KENZABUROU ,  HOSHI TOSHIHARU

    IPC: H01L39/24 ,  H01B12/04 ,  H01B13/00 ,  C04B35/50

    Abstract: A sintered elongated core made of a ceramic type superconductive material consisting essentially of (RxBa(1-x))3Cu2Oz in which R is Sc, Y La, Ho, Dy or Eu; x is in the range of from 0.3 to 0.8; and z is in the range of from 6 yo 7, is encased in glass and then heated, stretched and drawn.

    4.
    发明专利
    未知

    公开(公告)号：DE3805964A1

    公开(公告)日：1988-09-15

    申请号：DE3805964

    申请日：1988-02-25

    Applicant: YAMAHA CORP ,  YAMAHA MOTOR CO LTD

    Inventor： IIJIMA KENZABUROU ,  HAYASHI YOHINORI ,  SUZUKI MAKOTO ,  UCHIYAMA ATSUSHI

    IPC: G01D5/245 ,  H03M1/00 ,  H03M1/12 ,  G01D5/243 ,  H03L7/00

    Abstract: In construction of a digital phase locked loop for detection of the angular displacement of a mobile object depending on input signals from an encoder, is provided a bit number control circuit so that working bit numbers of A/D converters and a counter in the loop are automatically reduced as the frequency of the input signals rise and, in accordance with such reduction in working bit number, a function generating ROM of a smaller bit number is selected from a group of function generating ROMs of different bit numbers for supply of address data to multipliers connected to the A/D converters, thereby the signal processing speed of the loop is significantly raised to face up to current speed-up in the mobile object displacement.

    5.
    发明专利
    未知

    公开(公告)号：DE3830868C2

    公开(公告)日：1996-05-30

    申请号：DE3830868

    申请日：1988-09-10

    Applicant: YAMAHA CORP

    Inventor： IIJIMA KENZABUROU ,  NISHIMURA SEIYA ,  HAYASHI YOSHINORI

    IPC: H03M1/24 ,  G01D5/244 ,  G01P3/481 ,  G01P3/487 ,  G06K19/06 ,  H03M1/22 ,  G11B5/82 ,  G01B7/00 ,  G01D15/12

    Abstract: In constructoin of a magnetic recording medium provided with one circular track for magnetic graduations and another circular track for standard marks, the standard marks are accompanied with specified magnetic identification marks so that discrimination between the standard marks can be fairly done without any influence by the number of the standard marks only by reading them out together with the identification marks. The medium is advantageously used for displacement detectors such as magnetic rotary encoders and magnetic linear scales.

    6.
    发明专利
    未知

    公开(公告)号：DE3788893T2

    公开(公告)日：1994-08-04

    申请号：DE3788893

    申请日：1987-03-04

    Applicant: YAMAHA CORP

    Inventor： IIJIMA KENZABUROU ,  KURAHASHI KAZUO ,  HAYASHI YOSHINORI

    IPC: H03M1/06 ,  H03M1/24 ,  G01D5/249

    Abstract: In construction of a non-contact detection type rotary encoder, fluctuation in clearance between a rotary recording medium and a detection head is automatically canceled to pose no substantial influence on the system output.

    ROTARY MAGNETIC ENCODER
    7.
    发明专利
    ROTARY MAGNETIC ENCODER 未知

    公开(公告)号：GB2202951A

    公开(公告)日：1988-10-05

    申请号：GB8806709

    申请日：1988-03-21

    Applicant: YAMAHA CORP

    Inventor： NISHIMURA SEIYA ,  YAMAGUCHI MITSUO ,  IIJIMA KENZABUROU

    IPC: G01D11/24 ,  H03M1/30 ,  G01D5/12

    Abstract: In construction of a peripheral-magnetization type magnetic encoder having a rotary spindle and a magnetic head, a resin housing is formed by insert moulding so as to embrace the spindle leaving a slight tubular clearance to allow free axial rotation of the spindle, thereby providing direct, simple and stable support to the rotary spindle for enhanced precision in direction.

    8.
    发明专利
    未知

    公开(公告)号：DE3686330D1

    公开(公告)日：1992-09-10

    申请号：DE3686330

    申请日：1986-12-18

    Applicant: YAMAHA CORP

    Inventor： IIJIMA KENZABUROU ,  HAYASHI YOSHINORI ,  KURAHASHI KAZUO

    IPC: G01D5/14 ,  G01D5/16

    Abstract: In construction of a non-contact type pattern sensor for detecting pattern output from a recording medium, at least a pair of detecting elements such as magnetic resistor elements are arranged facing different surfaces of the recording medium with equally spaces clearance and outputs from the detecting elements are electrically processed so that detected pattern output from the pattern sensor should not be influenced by fluctuation in clearance to be caused by low production precision and/or warping of the recording medium.

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