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公开(公告)号：JPH04155224A
公开(公告)日：1992-05-28
申请号：JP28087890
申请日：1990-10-18
Applicant: YAMAHA CORP
Inventor： IIJIMA KENZABURO , KONDO KATSUFUMI
Abstract: PURPOSE:To detect a chord vibration within a plane orthogonal to a direction of tightening a chord by arranging a light emitting means and a photo detecting means on one side of the chord to detect vibration of the chord receiving the reflected light from the chord. CONSTITUTION:Six sets of light emitting elements 16A-16F and six sets of photo detectors 17A-17F are arranged under chords 14A-14F to detect vibrations of the chords to form a photo reflector. The photo detectors 17A-17F are arranged at such a position to maximize the reflected light from the chord in a direction orthogonal to a direction of tightening the chord and the focus of the photo detecting means is set outside an amplitude of the chord vibration. With such an arrangement, the light emitting elements 17A-17F generate photocurrents varying corresponding to changes in vertical and horizontal vibrations of the chords 14A-17F. The currents are converted into voltage values with a current-voltage conversion circuit 19F and outputted to a speaker amplifier after amplified.
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公开(公告)号：JPH03173583A
公开(公告)日：1991-07-26
申请号：JP31257089
申请日：1989-12-01
Applicant: YAMAHA CORP
Inventor： HARADA MUTSUMI , IIJIMA TAKASHI , HOSHI TOSHIHARU , IIJIMA KENZABURO
IPC: A63B53/04 , A63B102/32
Abstract: PURPOSE:To obtain a club head of a thin and highly accurate structure, to increase the flying distance, and to improve the directional stability, by manufacturing a hollow club head shell by an electrorytic separation of chromium. CONSTITUTION:A model furnishing the size and the outer form same as a club head to be a target is produced, and an outer electrode body 1 furnishing the inner surface made by copying negatively the whole outer surface from the model, as it is produced. On the other hand, an inner electrode body 3 a little smaller than the target club head furnishing a similar figure is produced. Then, the outer electrode body 1 is made as a cathode and the inner electrode body 3 as an anode, and by connecting them to a DC power source to carry out a chromium plating while pouring a chromium plating solution in the clearance 6, the chromium is separated electrolytically to the electrode surface 2 of the outer electrode body 1, piled up gradually, and the form of the electrode surface 2 is copied accurately. As a result, by forming the uneven surface responding to score lines and the like on the electrode surface 2 beforehand, the score lines and the like can be formed on the obtained club head, and furthermore, a bulge and a roll of the face can be also formed accurately.
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公开(公告)号：JPH0217845B2
公开(公告)日：1990-04-23
申请号：JP12329581
申请日：1981-08-06
Applicant: YAMAHA CORP
Inventor： SADA GAKUO , TAKAMURA MASAYUKI , IIJIMA KENZABURO
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公开(公告)号：JPH0291821A
公开(公告)日：1990-03-30
申请号：JP24282788
申请日：1988-09-28
Applicant: YAMAHA CORP
Inventor： IIJIMA KENZABURO , KONDO KATSUFUMI , KATO SHINJI
Abstract: PURPOSE:To eliminate the need for providing the conversion table of a carrier signal frequency corresponding to the address signal of a track and to record and reproduce data with high density by previously recording a synchronizing signal every track of an optical disk. CONSTITUTION:Plural pits corresponding to the synchronizing signal are previously recorded in the specified position A part in the optical disk 1. In order to record the data, the A part is detected by a position detector 8 at first and a timing signal and a recording inhibiting signal are generated 9 and recording is performed by making a data signal synchronize with a clock in synchronism with the synchronizing signal in a period when the inhibiting signal is not generated (an area except the A part). In order to reproduce the data, the A part is detected and the timing signal and inhibiting signal are generated, and the data is reproduced by making the signal read with laser light in the area except the A part correspond to the clock in synchronism with the synchronizing signal. Since the data is recorded and reproduced by synchronizing with the synchronizing signal, the data can be recorded and reproduced with high density on the disk.
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公开(公告)号：JPH0260382A
公开(公告)日：1990-02-28
申请号：JP21179488
申请日：1988-08-26
Applicant: YAMAHA CORP
Inventor： SADA GAKUO , IIJIMA KENZABURO , KONDO KATSUFUMI , KATO SHINJI
Abstract: PURPOSE:To reproduce a desired part of a slight time before by alternatively selecting and displaying the picture signal outputted from a television tuner and that outputted from a read pickup driving part. CONSTITUTION:Since a write head driving part 3 performs endless writing, programs of the station to which a television tuner 1 is tuned are continuously recorded on a magnetic disk 4. While a read pickup driving part 5 searches the innermost track, a read control circuit 32 reads out data in a RAM 31. When the signal of the internal tuner is switched to the output signal of a demodulating circuit 6, an image receiving part 7 starts display from picture data of the time, which corresponding to a designated track, before. Thus, data recorded on the disk 4 and data in the RAM 31 are alternatively selected to reproduce a desired part of a slight time before.
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Patent Agency Ranking
公开(公告)号：JPH0244569A
公开(公告)日：1990-02-14
申请号：JP19512988
申请日：1988-08-04
Applicant: YAMAHA CORP
Inventor： SADA GAKUO , IIJIMA KENZABURO , KONDO KATSUFUMI , KATO SHINJI
Abstract: PURPOSE:To successively read data from data to correspond to a desired time by providing a writing processing part which repeats writing and reading processing part to successively execute reading according to a writing order from a designated track in an optical disk. CONSTITUTION:Since a writing head driving part 3 executes the writing with being endless, the program of a station, which is turned by a television tuner 1 is continuously recorded to a magneto-optical disk 4. Next, by the operation of an operating part, a reading pick-up driving part 5 starts the reading of the disk 4 from the designated track. After the reading of the outer-most circumference track is finished, the driving part 5 searches the track in the inner-most circumference and starts the reading again. During the search, a reading control circuit 32 reads the data in a RAM 31. When the display of a televisions set 7 is executed by switching the output signal of a demodulating circuit 6, the picture data at a time, which goes back only by the time of correspond to the designated track, can be displayed on the television set 7.
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公开(公告)号：JPH01311219A
公开(公告)日：1989-12-15
申请号：JP14259788
申请日：1988-06-09
Applicant: YAMAHA CORP
Inventor： HAYASHI YOSHINORI , IIJIMA KENZABURO
Abstract: PURPOSE:To obtain accurate digital displacement data by calculating the digital displacement data from 1st and 2nd digital data. CONSTITUTION:A comparator 51 decides the level of a 1st displacement detection signal according to a reference level and outputs 1st and 2nd sampling clocks C1 and C2. Then a sample-hold circuit 54 reads the level of a 2nd displacement detection signal with the clock C1 and outputs it. Further, a sample-hold circuit 55 reads the level of a 3rd displacement detection signal with the clock C2 and outputs it. Then a comparator 56 subtracts the output level of the circuit 55 from the output level of the circuit 54 to output a 1st level signal difference Vxy and a comparator 57 outputs the level difference Vyx between the circuits 55 and 54. Further, switches 60 and 61 select the level difference signals Vxy and Vyx and output a reference level correcting signal VADJ. Then a comparator 62 corrects the reference level with the signal VADJ. Then a dividing circuit 30 quantizes 1st and 2nd displacement signals to calculate the digital displacement data from the 1st and 2nd digital data.
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公开(公告)号：JPH01194118A
公开(公告)日：1989-08-04
申请号：JP1842988
申请日：1988-01-28
Applicant: YAMAHA CORP
Inventor： HOSHI TOSHIHARU , IIJIMA KENZABURO
IPC: G11B5/235
Abstract: PURPOSE:To obtain a large reproducing output and to improve the S/N of a reproducing signal by arranging a gap material made of a superconductor for a head gap. CONSTITUTION:A gap material 28 made of the superconductor is arranged for a head gap 16. Consequently, by the Meissner effect of the superconductor, the leakage flux of the head gap 16 is efficiently guided to the side of a recording medium, a magnetic flux density passing through the recording medium increases and recording depth can be deeply obtained also to a high coercive force recording medium. Thus, the large reproducing output can be obtained, the S/N of the reproducing signal is improved, it is unnecessary to increase the number of the turns of a coil 12 or a recording current, therefore, the enlargement of a magnetic head and the increase of power consumption can be prevented, further, it is unnecessary to widen gap length and therefore, recording can be executed with a high recording density.
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公开(公告)号：JPH01141871A
公开(公告)日：1989-06-02
申请号：JP29957287
申请日：1987-11-27
Applicant: YAMAHA CORP
Inventor： SADA GAKUO , IIJIMA KENZABURO , HOSHI TOSHIHARU
Abstract: PURPOSE:To obtain a superconducting material having stable superconductive characteristics by heating compds. of a rare earth metal, an alkaline earth metal and copper to dry the compds., calcining and pulverizing the dried compds., molding and sintering the resulting powder. CONSTITUTION:When starting materials are mixed, calcined and pulverized and the resulting powder is molded and sintered to produced superconducting material, compds. of a rare earth metal, an alkaline earth metal and copper as the starting materials are dried to =100 deg.C, preferably 500-1,100 deg.C, e.g., in the air. The produced superconducting material is represented by the formula (where R is Sc, Y, La, Nd, Pm, Sm, Eu, Gd, Ho, Er, Tm, Yb and/or Lu, A is Mg, Ba, Sr and/or Ca, 0.5
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公开(公告)号：JPS6463809A
公开(公告)日：1989-03-09
申请号：JP22091587
申请日：1987-09-03
Applicant: YAMAHA CORP
Inventor： IIJIMA KENZABURO , NISHIMURA KIYOYA , HAYASHI YOSHINORI
Abstract: PURPOSE:To dispense with position alignment of the origin when the title device is fitted to a substance to be detected, by providing a writing means to write an origin information in an information recording element and an erasing means to erase the origin information written in the information recording element. CONSTITUTION:When the basic position of rotation of a substance to be detected is altered, terminals 6a and 6b and terminals 6d and 6e of selector switch 6 are connected respectively. Thereby an output of a power source 4 for erasure is supplied to a magnetic head 3 through the switch 6. A magnetic disk 1 is rotated one time in this state. An origin mark written in a track T2 is thereby erased. The substance to be detected is rotated to a new basic position of rota tion thereafter, and terminals 6a and 6c and terminals 6d and 6f of the switch 6 are connected in a short time respectively at a point of time when the new basic position of rotation is reached. Thereby a new origin mark is written in the track T2.
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