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公开(公告)号：JPH03290884A
公开(公告)日：1991-12-20
申请号：JP9369490
申请日：1990-04-09
Applicant: SONY CORP
Inventor： FUJII HIROSHI , YAMASHITA KEITARO
IPC: G11B23/087
Abstract: PURPOSE:To improve the exactness of reel lock by twisting a link part by pressing one lock part, turning a lock part, moving the other lock part and rotating another tape reel in a direction increasing the tension of a tape. CONSTITUTION:A lock pawl 19a is moved in an arrow E direction by force F applied onto a lock arm 19, and a lock part 13 is turned in a counter-closwise direction by the torsion of a link part 14. With this turn, another lock arm 19' receives turning force in the counter-clockwise direction and therefore, a lock pawl 19'a is pressed to a gear 8' of a lower flange 7' on a T reel side. Then, a lower flange 7 further receives rotational force in an arrow B' direction. In such a way, since force in the direction increasing the tape tension is applied onto a magnetic tape 5 can be prevented from being unfastened. Thus, the suitable tension is applied onto the tape at all times and the reel lock is enabled without fail.
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公开(公告)号：JPH03280202A
公开(公告)日：1991-12-11
申请号：JP7911490
申请日：1990-03-28
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO , SAITO TAKEHIKO
IPC: G11B5/008
Abstract: PURPOSE:To make it possible to compact a rotary drum without increasing rotational frequency by setting up the product of the 2nd drum diameter and the 2nd tape winding angle equally to the product of the 1st drum diameter and the 1st tape winding angle and executing the time base extension of a video signal to obtain interchangeability with a reference system. CONSTITUTION:The product of the 2nd drum diameter D2 and the 2nd tape winding angle Q2 is set up equally to the product of the 1st drum diameter D1 and the 1st tape winding angle Q1 and the 2nd digital processing part 60 executes the time base extension of a video signal based upon the 1st processing clock signal to be utilized by the 1st digital processing part and the 2nd processing clock signal relating to the ratio of the 1st and 2nd drum diameters D1, D2 to obtain interchangeability with the reference system. Consequently, the rotary drum can be made compact without increasing the rotational frequency of the rotary drum.
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公开(公告)号：JPH03139076A
公开(公告)日：1991-06-13
申请号：JP27646989
申请日：1989-10-24
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO
Abstract: PURPOSE:To discriminate video signals whose frame frequencies are equal and whose effective scanning lines are different by detecting a signal level of a prescribed line of an input video signal. CONSTITUTION:In the case of transmitting a video signal of a studio standard by an MUSE(multiple sub-Nyquist sampling encoder) system, a video part allocated to a specific line is eliminated in a demodulated video signal. Therefore, by detecting the eliminated part of the video signal of the line, the kind of an input signal SE can be discriminated. Accordingly, by generating a video part discriminating pulse PSE, based on a horizontal synchronizing signal SH from a pulse generating circuit 10, and taking OR to a line discriminating signal SL, whether the video signal of the specific line exists or not is detected. In such a way, the video signal transmitted by the studio standard and the MUSE system is discriminated, and the video signal can be displayed surely.
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公开(公告)号：JPH02124693A
公开(公告)日：1990-05-11
申请号：JP27826388
申请日：1988-11-02
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO
IPC: H04N9/79 , G11B15/467
Abstract: PURPOSE:To obtain a beat signal with excellent S/N at reproduction by applying 1/4 offset to a frequency of a pilot signal with respect to a horizontal frequency and applying 1/2 offset to a frequency of a beat signal with respect to the horizontal frequency. CONSTITUTION:Frequencies f1-f4 of a pilot signal are selected so as to have 1/4 offset with respect to an integral number of multiple nfh of the horizontal frequency, and a frequency of a beat signal is selected so as to have 1/2 offset. A tracking error is detected based m on a level of a beat signal of frequencies (1/2fh and 3/2fh) between a pilot signal of an object track and a pilot signal from both adjacent tracks at the reproduction side, the capstan servo system or the piezoelectric element of a moving head is controlled by the error to apply tracking control. Thus, the S/N of the heat signal is improved.
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公开(公告)号：JPH02122402A
公开(公告)日：1990-05-10
申请号：JP27514288
申请日：1988-10-31
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO
IPC: G11B5/02
Abstract: PURPOSE:To decrease an induced voltage, and to improve an S/N in an RF transmission system in a wide range by setting a signal current in a reverse direction between a first coil and a second coil formed with folding one edge of the first coil. CONSTITUTION:A coil 1 consists of a coil 1a at a radius ra, and a coil rb at a radius rb, which is formed by folding one edge of the coil 1a, formed so as to have the reverse winding direction to the coil 1a and so as to be concentric (radius rb > radius ra), and the coil 1a is concentrically arranged inside the coil 1b, and a signal currents 'is' are applied in mutually reverse directions between the coils 1b and 1a. Further, a coil 2 has the same constitution, and the signal currents is are applied in the mutually reverse directions between coils 2d and 2c. Thus, the induced voltage is offset, and the influence of unnecessary radiation on a rotary transformer can be decreased.
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Patent Agency Ranking
公开(公告)号：JPS63275002A
公开(公告)日：1988-11-11
申请号：JP11141087
申请日：1987-05-07
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO
IPC: G11B5/027
Abstract: PURPOSE:To reduce the interference due to an undesired reproducing signal component by forming a correction signal component based on a reproduced component obtained by the action of a magnetic gap in a reproducing signal from a magnetic head. CONSTITUTION:A 1st signal multiplied with the coefficient Ee/Eg, where Eg is a level of a reproduced component obtained by the action of a magnetic gap from a reproducing signal obtained from a magnetic head and Ee is a level of the undesired reproduced component from the edge of a magnetic core, (¦Eg¦>¦Ee¦) or a 2nd signal obtained by retarding the reproducing signal by a prescribed time, and a 3rd signal obtained by multiplying a coefficient of Ee/Eg with the level of the reproducing signal are formed in pairs. Then the processing subtracting the 1st signal from the reproducing signal obtained from the magnetic head or the processing subtracting the 3rd signal from the 2nd signal is applied. Thus, the undesired reproducing signal component in the reproducing signal obtained from the magnetic head is effectively reduced.
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公开(公告)号：JPS63213101A
公开(公告)日：1988-09-06
申请号：JP4521987
申请日：1987-03-02
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO , KOMURO TERUYOSHI
IPC: G11B5/02
Abstract: PURPOSE:To prevent quality from being lowered by damping the leakage of a signal picked up by a rotary head for erasure to a reproducing signal and improving the S/N of the reproducing signal at a time of reproduction, by providing an HPF between the rotary head for erasure and a rotary transformer. CONSTITUTION:When a rotary drum RD is rotated and is slid on a tape TP, the reproducing signals are impressed on coils L and L on a rotary side via the rotary heads H1 and H2 of first and second channels, and are transmitted to coils L1' and L2' on a fixed side. In such a case, the HPF4 is provided between the rotary head HE for erasure and the rotary transformer RT, and the signal reproduced (picked up) by the head HE at the time of reproduction is inputted to the HPF4, and a level of low frequency band area is damped to the level causing no problem for a practical use. In other words, as for the signal reproduced by the head HE and applied on a coil Le, the leakage of the signal from the coil Le is damped even when the transformer RT without having a short ring between the coils L2 and Le is used, and it is possible to improve the S/N of the reproducing signal, and to prevent deterioration in picture quality from occurring.
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公开(公告)号：JPS6371903A
公开(公告)日：1988-04-01
申请号：JP21653186
申请日：1986-09-13
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO
Abstract: PURPOSE:To improve productivity by specifying the erasing track width and making a rotary erasing head perform erasing operation in a non-operation period of a magnetic head connected to a specified coil and at the rate of once in three rotation of a rotary drum. CONSTITUTION:A rotary erasing head Hfe connected to a signal for erasing transmitting coil Lfe is made to perform erasing operation in the non-operation period of a magnetic head connected to an adjoining signal transmitted coil and at the rate of once in three rotation of a rotary drum, and the erasing track width Tw is made Tw>=4Tp (where Tp is recording track pitch). Thereby, a short ring between the signal transmitting coils of magnetic heads of the same azimuthal angle and a short ring between the signal transmitting of the magnetic head and the signal for erasing transmitting coil are made unnecessary, and accordingly, the number of grooves of the core of a rotary transformer can be reduced, and the accuracy of working and assembling can be eased.
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公开(公告)号：JPS6371901A
公开(公告)日：1988-04-01
申请号：JP21653386
申请日：1986-09-13
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO
Abstract: PURPOSE:To make good recording and erasing without causing trouble by making the saturation magnetic flux density of one of a pair of magnetic cores lower than the saturation magnetic flux density of another magnetic core and reversing the direction of rotation of a discoid magnetic recording medium when recording and when erasing. CONSTITUTION:Out of a pair of magnetic cores 11, 12 that form a gap (g), the saturation magnetic flux density (Bs) of one magnetic core 11 having thickness t1 is made lower than the saturation magnetic flux density of another magnetic core 12 having thickness t2. At the time of recording, a magnetic disk D is rotated in positive direction, for instance, in the direction of arrow mark A in the figure, and at the same time, the signals supplied from a terminal 21 are sent to a magnetic head 10 through a recording/reproducing processing circuit 22 and a change-over switch 23, and recorded in the magnetic disk D. At the time of erasing, the magnetic disk D is rotated in reverse direction, for instance, in the direction of arrow mark B, and at the same time, the AC signals for erasing are supplied from an oscillator 24 to the magnetic head 10 through an amplifier circuit 25 and a change-over switch 23, and the erasing operation is performed.
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公开(公告)号：JPS6370901A
公开(公告)日：1988-03-31
申请号：JP21407686
申请日：1986-09-12
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO
Abstract: PURPOSE:To dispose magnetic heads adjoining each other without interposing short rings and to reduce the number of short rings by short-circuiting the signal transmission coils of such ones of magnetic heads whose azimuth angles are equal to each other as not in an acting state. CONSTITUTION:A signal transmission coil Lfe for erasing is disposed in the inner neighborhood of a signal transmission coil L1a disposed innermost circumference among the signal transmission coils L1a-L2b of a rotary transformer 17, and rotary erasing head Hfe is activated only during the nonacting period of the magnetic head H1a connected to the adjacent signal transmission coil L1a. This means that the magnetic head H1a acts only for a period in which it rotates for a rotary angle of 270 deg.+alpha+beta during one cycle. During the time other than this acting period, the signal transmission coil L1a is short-circuited, and the rotary erasing head Hfe is activated only within the nonacting period of the magnetic head H1a. As a result, the signal transmission coil Lfe for erasing and the signal transmission coil L1a can be disposed adjoining each other without a short ring.
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