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公开(公告)号：JPH0482574A
公开(公告)日：1992-03-16
申请号：JP19584190
申请日：1990-07-24
Applicant: YAMAHA CORP
Inventor： HARADA MUTSUMI , HOSHI TOSHIHARU , IIJIMA KENZABURO
IPC: A63B53/04 , A63B102/32
Abstract: PURPOSE:To reduce the rigidity of a crown surface without reducing the thickness of the crown surface by corrugating the crown surface of a head body formed of a metal or FRP with the wave length in the ball driving direction. CONSTITUTION:A head body 1 of a wood club for golf has a super-plastic alloy shell structure made of stainless steel, aluminum alloy or magnesium alloy and formed of a face surface 2, back surface 3, sole surface 4, crown surface 5, toe side surface 6, heel side 7 and hosel part 8 to which a shaft S is mounted. The whole crown surface 5 of the head body 1 is formed with a corrugated part 51 producing the progress of wave motion in the ball driving direction to reduce the rigidity of the crown surface 5 in the ball driving direction. Thus, when a ball is driven by the face surface 2 of the head body 1, while an initial ball driving angle is enlarged, the locus of a ideally large trajectory with few lofty fly is obtained.
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公开(公告)号：JPH03209586A
公开(公告)日：1991-09-12
申请号：JP407990
申请日：1990-01-11
Applicant: YAMAHA CORP
Inventor： HAYASHI YOSHINORI , IIJIMA KENZABURO , TAKEUCHI NANAYUKI , INOKI AKIHITO , MIKI AKIRA , YAMASHITA MASAYOSHI
IPC: G06K7/10
Abstract: PURPOSE:To obtain scan at equal speed by converting the respective resistance values of first and second supporting wires to be changed corresponding to the oscillation of a reflection mirror to angular signals and controlling the oscillation angle and oscillation speed of the reflection mirror by an error signal corresponding to difference between the angular signal and a reference angular signal. CONSTITUTION:When a power source is turned on to a laser scanner and a reference angular signal Rtheta is inputted to an input terminal T2, the signals of sintheta and costheta to be respectively detected corresponding to the torsion amounts of upper and lower wires W1 and W2 are converted to an angle detection signal Dtheta by a digital phased lock loop 3. Next, the angle detection signal Dtheta is converted to an angle feedback signal ftheta by a digital / analog converter 4 and compared with a reference angular signal Rtheta. Then, a servo loop is formed and control is executed so that an error signal Es of (Rtheta-ftheta) to be outputted from an adder 5 can be 0. Thus, the oscillation of a plane mirror MR is controlled at fixed speed.
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公开(公告)号：JPH03165214A
公开(公告)日：1991-07-17
申请号：JP30528389
申请日：1989-11-24
Applicant: YAMAHA CORP
Inventor： IIJIMA KENZABURO , HAYASHI YOSHINORI , TAKEUCHI SHICHIYUKI , SUZUKI TAKESHI
Abstract: PURPOSE:To accomplish the prolongation of life and increase of torque by keeping a permanent magnet and a magnetic detecting element in a non-contact state. CONSTITUTION:A circuit substrate 13 provided with an MR sensor 11 and an amplifier 12, etc., is disposed on the upper stage part 10C of a main body 10, and in the inner part, a rotor 16 is rotatably disposed. The columnar permanent magnet 17 is fitted in the rotor 16 so that it may be provided with a prescribed off-set toward the central axis of rotation. The MR sensor 11 is formed so that two MR elements 1 may be arranged to be orthogonally crossed with each other, and by changing the resistance of the MR element 1 in accordance with the rotation of the rotor 16, a voltage provided with a straight line >=3.0% in accordance with the rotation at the angle of 300 deg. is outputted. A rotation angle can be detected by measuring the voltage.
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公开(公告)号：JPH0318326B2
公开(公告)日：1991-03-12
申请号：JP8052681
申请日：1981-05-27
Applicant: YAMAHA CORP
Inventor： TAKAMURA MASAYUKI , IIJIMA KENZABURO , HAYASHI YOSHINORI
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公开(公告)号：JPH0323517A
公开(公告)日：1991-01-31
申请号：JP15784589
申请日：1989-06-20
Applicant: YAMAHA CORP
Inventor： IIJIMA KENZABURO , KONDO KATSUFUMI
IPC: G11B7/00 , G11B7/0025 , G11B7/085
Abstract: PURPOSE:To obtain high recording density and to miniaturize the device by rotating a cylindrical substrate coated with recording film centering around a shaft at equal speed and moving an optical pickup along the face of the cylindrical substrate so that recording and reproducing may be performed. CONSTITUTION:The device is provided with the hollow cylindrical substrate 2 coated with the recording film 1a and a rotation driving device 9 for rotating the hollow cylindrical substrate 2 at a fixed speed. And also the device is provided with a fixed shaft 4 coaxially inserted in the hollow cylindrical substrate 2 and for supporting the hollow cylindrical substrate 2 so that it can be freely rotated, the optical pickup 5 which is disposed so as to be freely moved along the fixed shaft 4 and a linear driving device 8 for moving the optical pickup 5 in an axial direction. And the cylindrical substrate 2 coated with the recording film 1a is rotated at a prescribed angluar velocity by the rotation driving device 9, and the recording and the reproducing on the recording film 1a are performed by the optical pickup 5 which is freely moved along the fixed shaft 4 by the linear driving device 8. Thus, the high storing density of the device can be accomplished and also the device can be miniaturized.
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Patent Agency Ranking
公开(公告)号：JPH02234017A
公开(公告)日：1990-09-17
申请号：JP5557889
申请日：1989-03-08
Applicant: YAMAHA CORP
Inventor： HARADA MUTSUMI , KATO SHINJI , HAYASHI YOSHINORI , HOSHI TOSHIHARU , IIJIMA KENZABURO
Abstract: PURPOSE:To exactly detect an exact displacement by laminating a thin Sm-CO alloy film on a substrate and magnetizing the same at the magnetization pitch of >=3 times the crystal grain size of the thin Sm-Co alloy film. CONSTITUTION:The thin Sm-Co alloy film 2 is laminated on the substrate 1 consisting of a copper or copper alloy sheet, etc., and is magnetized at the magnetization pitch of >=3 times the crystal grain size of the thin film 2. The fluctuation in the output wavelength of the magnetic recording medium is controlled to
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公开(公告)号：JPH0261859A
公开(公告)日：1990-03-01
申请号：JP21179388
申请日：1988-08-26
Applicant: YAMAHA CORP
Inventor： SADA GAKUO , IIJIMA KENZABURO , KONDO KATSUFUMI , KATO SHINJI
IPC: G11B20/00
Abstract: PURPOSE:To enable the reproduction of a desired part to be performed even in recording by performing the write of compression image data in an endless manner, storing the data from the present time up even to a past prescribed time in an optical disk, reading out the data corresponding to a desired time sequentially, and reproducing it to original image data by an expansion means. CONSTITUTION:When readout command data and track position designation data are supplied to a pickup driving part 5, the readout of a magento-optical disk 4 from a designated track is started, and hereinafter, the readout track of the driving part 5 is updated sequentially, and a readout processing is executed. Next, the optical head 21 of the driving part 5 is moved to the innermost periphery when a readout command is issued successively even after the readout of the image data on an outermost peripheral track is completed, and the readout processing is started again from the track on the innermost periphery. In such a manner, the data in a RAM 13 is read out by using a readout control circuit 32 while the driving part 5 searches the innermost peripheral track, and interruption in the image data outputted from a demodulation circuit 6 can be prevented from occurring.
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公开(公告)号：JPH0261519A
公开(公告)日：1990-03-01
申请号：JP21179588
申请日：1988-08-26
Applicant: YAMAHA CORP
Inventor： IIJIMA KENZABURO , INOKI AKIHITO
Abstract: PURPOSE:To uniformize a line of magnetic force being discharged and to enhance the accuracy of an encoder by setting the composition of a magnetic recording medium to a specific one and also setting a mean crystal particle size to a definite size or less. CONSTITUTION:A magnetic recording medium is constituted of a composition consisting of 10-45wt.% of Cr, 3-35wt.% of Co, 0.1-2.0wt.% of one or more kind of Ti, Zr or Al and the remainder of Fe. Further, when the area of the magnetic recording medium (e.g., the area of the detection part of an MR element) participating in a magnetic detection element (e.g., a reading head such as the MR element) is set to S and the mean particle size of the magnetic recording medium is set to (d), the relation of d is satisfied. By this method, the magnetic recording medium excellent in magnetic characteristics, composition processability and cutting processability and discharging a uniform line of magnetic force is obtained.
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公开(公告)号：JPH01189517A
公开(公告)日：1989-07-28
申请号：JP1498188
申请日：1988-01-26
Applicant: YAMAHA CORP
Inventor： NISHIMURA KIYOYA , HAYASHI YOSHINORI , IIJIMA KENZABURO
IPC: G01D5/245
Abstract: PURPOSE:To simplify an assembling process and to reduce manufacturing cost, by directly magnetically recording a magnetized pattern to one end surface of a shaft. CONSTITUTION:A shaft 12 obtained by forming a magnetic material having excellent processability and high strength such as an iron-chromium-cobalt system into a columnar shape is supported in a freely rotatable manner by a casing 10 and a magnetized pattern M is magnetically recorded on the one end surface 12a of the shaft 12 at the same pitch as a wavelength lambda along the peripheral edge thereof by magnetizing the circumference of a circle centering around the axial core of the shaft 12 by a sine wave. When the shaft 12 is rotated and the magnetized pattern M is relatively displaced with respect to the detection part of a magnetic sensor 14, the detection signal corresponding to displacement quantity and the quantity and direction of rotation of the shaft 12 are calculated. By this method, a process for mounting a separate magnetic recording medium to the shaft 12 or the control work of a gap G becomes unnecessary and an assembling process is simplified.
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公开(公告)号：JPS6475647A
公开(公告)日：1989-03-22
申请号：JP23149587
申请日：1987-09-16
Applicant: YAMAHA CORP
Inventor： SADA GAKUO , IIJIMA KENZABURO , HOSHI TOSHIHARU
Abstract: PURPOSE:To manufacture a magnetic alloy having a texture in which an easy magnetization axis is oriented in a direction perpendicular to a rolling direction, by cold-rolling an ingot of Fe-Cr-Co magnetic alloy and subjecting the above to primary recrystallization annealing in an (alpha+gamma)-phase region and successively to secondary recrystallization annealing under specific temp. conditions. CONSTITUTION:An ingot of Fe-Cr-Co magnetic alloy which has a composition consisting of, by weight, 10-40% Cr, 3-30% Co, and the balance Fe or further containing 0.01-2% Mn and 0.001-0.2% S or containing 0.01-2% Al and 0.0006-0.2% N is cold-rolled at 5.0-99.5% draft. Successively, the resulting sheet is subjected to primary recrystallization annealing at a temp. in an (alpha+gamma)-phase region and then to secondary recrystallization annealing, or subjected to primary recrystallization annealing in an alpha-phase region, to heating in an (alpha+gamma)-phase region, and then to secondary recrystallization annealing, or subjected to primary recrystallization annealing in an (alpha+gamma)-phase region, to heating in an (alpha+gamma+sigma)-phase region, and then to secondary recrystallization annealing, or subjected to primary recrystallization annealing in an alpha-phase region, to heating in an (alpha+gamma)-phase region and an (alpha+gamma+sigma)-phase region, and then to secondary recrystallization annealing.
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