公开(公告)号：WO1984003788A1

公开(公告)日：1984-09-27

申请号：PCT/JP1984000110

申请日：1984-03-16

Applicant: SONY CORPORATION ,  HAYAKAWA, Kiyonori ,  MISHIMA, Akio

Inventor： SONY CORPORATION

IPC: G11B05/12

CPC classification number: G11B5/1278

Abstract: A single magnetic pole type of composite magnetic head for perpendicular recording comprises a perpendicular recording-reproducing head unit and an erase head unit. The perpendicular recording-reproducing head unit consists of a main recording-reproducing magnetic pole (10) made of a thin film of a soft magnetic material of which one end faces a magnetic recording medium (11), and which has a predetermined width; non-magnetic guard members (12a) (12b) which clamp, from both sides, the surface of the main recording-reproducing magnetic pole (10) which faces the magnetic recording medium; a magnetic core part (13a) which is integrated with the non-magnetic guard member (12a) and is positioned a predetermined distance away from the magnetic recording medium (11) in contact with at least one surface of the main recording-reproducing magnetic pole (10); and a groove part (15) provided in the magnetic core part (13a) which separates a first auxiliary magnetic pole part (14a) in contact with the main recording-reproducing magnetic pole (10) and a return path part (14b) acting as a return path for the magnetic flux of the main recording-reproducing magnetic pole (10), and about which a winding is provided on the main recording-reproducing magnetic pole (10). On the other hand, the erase head unit is composed of a pair of main erasing magnetic poles (18a) (18b) which are positioned a predetermined distance away from the main recording-reproducing magnetic pole (10) in the direction of travel of the magnetic recording medium (11), facing the medium, and are arranged so that the distance therebetween is smaller than the width of the main recording-reproducing main magnetic pole (10); and an erasing winding (21) exciting the main erasing magnetic poles (18a) (18b). The main recording-reproducing magnetic pole (10) and the main erasing magnetic poles (18a) (18b) are integrated with each other by the non-magnetic guard member (12b) at the surfaces thereof which face the magnetic recording medium. Thus there is no possibility that previous data is left unerased when rewriting, even if a track deviation occurs because of some misalignment of the magnetic recording medium (11) in loading, or the expansion and contraction thereof due to changes in temperature or humidity, and it is possible to obtain accurate data during reproduction.

公开(公告)号：WO1984003386A1

公开(公告)日：1984-08-30

申请号：PCT/JP1984000064

申请日：1984-02-22

Applicant: SONY CORPORATION ,  HAYAKAWA, Kiyonori

Inventor： SONY CORPORATION

IPC: G11B05/12

CPC classification number: G11B5/1278

Abstract: A perpendicular magnetic recording head comprises a main magnetic pole (2) constituted by a thin layer of a soft magnetic material and a pair of guard blocks (4) (4') integrally bonded to the main magnetic pole (2) so as to sandwich it from both sides thereof. The guard blocks (4) (4') are each constituted by a composite of a non-magnetic material portion (5) or (5') extending from the surface of the head which comes into contact with a magnetic recording medium, as far as a predetermined position, and a magnetic material portion (6) or (6'). The joint between each non-magnetic material portion (5) or (5') and the corresponding magnetic material portion (6) or (6') is provided with a groove (9) or (9') constituting an auxiliary magnetic pole portion (7) or (7') which is connected magnetically to the main magnetic pole (2) so as to act as an auxiliary magnetic pole across the width in the direction of travel of the magnetic recording medium. Each auxiliary magnetic pole portion (7) or (7') formed by the groove (9) or (9') has a smaller width in the direction of the track than that of the guard block (4) or (4'). A winding C is provided on the main magnetic pole (2) within the grooves (9) (9'), and the impedance of the winding C is reduced to increase the magnetic recording and reproduction efficiency.

公开(公告)号：WO1984003167A1

公开(公告)日：1984-08-16

申请号：PCT/JP1984000037

申请日：1984-02-09

Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. ,  SATOMI, Mitsuo ,  KUROE, Akio ,  SAWAI, Eisuke ,  HIGASHIONJI, Masaru ,  SAKAKIMA, Hiroshi ,  KONDO, Kenji

Inventor： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

IPC: G11B05/12

CPC classification number: G11B5/147

Abstract: A magnetic head is constituted by a block composed of a magnetic core made of sputtered amorphous magnetic alloy layers (2a, 2b) formed on a non-magnetic substrate (1), a non-magnetic ceramic layer (4) provided on the sputtered layer (2b), and a non-magnetic substrate (5) bonded to the non-magnetic ceramic layer (4) by a bonding glass layer (6). Since the sputtered amorphous magnetic alloy layer (2b) and the bonding glass layer (6) are isolated from each other by the nonmagnetic ceramic layer (4), the properties of the bonding glass layer (6) are protected and do not change, and so a firm bonding strength is maintained. The amorphous ceramic layer (4) is also firmly bonded to the sputtered layer (2b), so that a highly reliable magnetic head can be realized.

公开(公告)号：EP0105531A3

公开(公告)日：1986-02-05

申请号：EP83111439

申请日：1983-07-14

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Sawazaki, Norikazu

IPC: G11B05/00 ,  G11B05/33 ,  G11B05/62 ,  G11B05/12

CPC classification number: G11B5/1278 ,  G11B5/00 ,  G11B5/33 ,  G11B5/332 ,  G11B5/62

Abstract: Signals are recorded on a magnet tape (1) having a magnetic recording layer (1b-2) containing a magnetic material whose high frequency characterstic varies with a magnetic field produced therein. Changes in the coupling degree of a high frequency coupling circuit (12, 20a) caused by a signal field allows to reproduce a recorded signal.

Abstract translation: 信号记录在具有包含磁性材料的磁记录层（1b-2）的磁带（1）上，磁性材料的高频特性随其中产生的磁场而变化。 由信号场引起的高频耦合电路（12,20a）的耦合度的变化允许再现记录的信号。

公开(公告)号：EP0081855A3

公开(公告)日：1985-11-06

申请号：EP82111647

申请日：1982-12-15

Applicant: Matsushita Electric Industrial Co., Ltd.

Inventor： Miyatake, Norio ,  Uenishi, Mitsuaki ,  Kashimura, Nobuo ,  Ishiwatari, Keizo

IPC: G11B05/12

CPC classification number: G11B5/325 ,  G11B5/00826 ,  G11B5/024

Abstract: A permanent magnet type erasing head for generating a gradually decreasing alternating magnetic field in which a plurality of magnetic poles (43-45, 110, 111) are provided along a magnetic recording medium. The first magnetic pole (43, 110) generates a magnetic field of an intensity strong enough to saturate the magnetic recording medium while each of the second and succeeding magnetic poles (44, 111) except the last magnetic pole (45) have a magnetic field with an opposite polarity to that of a preceding magnetic pole and a weaker intensity than that of the preceding magnetic pole.

公开(公告)号：EP0110365A3

公开(公告)日：1985-06-19

申请号：EP83111898

申请日：1983-11-28

Applicant: OLYMPUS OPTICAL CO., LTD.

Inventor： Yunoki, Yutaka ,  Kimura, Kenji ,  Kato, Akira ,  Imamura, Tasuo

IPC: G11B05/008 ,  G11B05/52 ,  G11B05/78 ,  G11B05/12 ,  G11B05/02

CPC classification number: G11B5/531 ,  G11B5/0086 ,  G11B5/02 ,  G11B5/1278 ,  G11B5/534 ,  G11B5/538 ,  H04N5/78263

Abstract: A helical scanning type video tape recorder having a rotary cylinder (2) which is slidable on a video tape (3); and a pair of vertical magnetization recording heads (11, 12) mounted on the peripheral wall of the rotary cylinder (2) at prescribed positions; that plane of the vertical magnetization recording heads (11, 12) which faces the magnetic plane of the video tape (3) being provided with a main magnetic pole (33) and auxiliary magnetic pole (31), thereby causing at least one portion (34a) of the recording magnetic flux (Φ) passing from the auxiliary magnetic pole (31) to the main magnetic pole (33) to penetrate the recording magnetic layer (3c) of the video tape (3) at substantially right angles.

Abstract translation: 一种具有可在录像带（3）上滑动的旋转圆柱体（2）的螺旋扫描型录像机; 和一对在预定位置安装在旋转圆筒（2）周壁上的垂直磁化记录头（11,12） 垂直磁化记录头（11,12）的面对录像带（3）的磁性平面的那个平面设置有主磁极（33）和辅助磁极（31），从而导致至少一部分 从辅助磁极（31）通到主磁极（33）的记录磁通量（Φ）的大小（图34a）基本上以直角穿过录像带（3）的记录磁性层（3c）。

公开(公告)号：EP0097975A3

公开(公告)日：1984-03-28

申请号：EP83106393

申请日：1983-06-30

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Yamamori,Kazuyoshi

IPC: G11B05/12 ,  G11B05/22 ,  G11B05/27

CPC classification number: G11B5/2651 ,  G11B5/1278 ,  G11B5/1871

Abstract: A magnetic head including a head chip (22) and head holders (24,26) for holding the head chip therebetween. The head chip includes a core (28, 30) of magentically permeable material which is closed except for a transducing gap (32, 34, 35) provided in the core and is wound by a coil (42, 44). The head holders (24,26) are made of non-magnetic material and has a guide surface which is brought into slidable contact with a magnetic recording medium. On the guide surface, grooves (50, 52) are formed along the direction of the relative movement of the magnetic recording medium with respect to the head.

公开(公告)号：EP0078374A3

公开(公告)日：1984-02-22

申请号：EP82107575

申请日：1982-08-19

Applicant: International Business Machines Corporation

Inventor： Jones, Robert Edward

IPC: G11B05/12

CPC classification number: G11B5/1278

Abstract: © A thin film inductive transducer comprises three magnetic layers (10, 11, 12) deposited on an air bearing slider substrate (13) for perpendicular recording of magnetic transitions on a movable magnetic medium. Two magnetic closures are provided. One is defined by contact of one outer magnetic layer (12 or 10) with the intermediate magnetic layer (11 or 11') within the area bounded by conductive turns (a-h) of a single layer coil (19 or 19'). The other is defined by contact (10,12 or 10', 12') outboard of the conductive turns (a-h). Magnetic transitions may be read by conventional peak detection techniques because the disclosed transducer has three pole tips (P1, P2, P3), the central one (P2) of which is approximately 3-40% of the thickness of the outer pole tips (P1, P3). To avoid "wrap-around" the pole tips (P1, P2, P3) are progressively less wide as their distance from the substrate (31) increases.

公开(公告)号：EP0071489A3

公开(公告)日：1983-09-07

申请号：EP82304048

申请日：1982-07-30

Applicant: FUJITSU LIMITED

Inventor： Toda, Junzo ,  Hiyane, Masao

IPC: G11B05/12 ,  G11B05/20 ,  G11B05/30

CPC classification number: G11B5/1278

Abstract: A perpendicular magnetic recording and reproducing head is disclosed which comprises a spiral coil (16) consisting of at least one electrically conductive thin film, and a main pole (10) consisting of a first thin magnetic film and having an end (11) for recording and reproducing information, the main pole and the spiral coil being electromagnetically coupled to each other. Such a perpendicular magnetic head can be reasonably easily manufactured, can be adapted not only to floppy disks but also to rigid disks, can be suitable for high-frequency operation, and can have an improved recording/reproducing efficiency as compared with conventional magnetic recording and reproducing heads.

公开(公告)号：EP0041133A3

公开(公告)日：1982-03-17

申请号：EP81103370

申请日：1981-05-05

Applicant: International Business Machines Corporation

Inventor： Elsel, Karl Heinz ,  Kerl, Russel Ray

IPC: G11B05/40 ,  G11B05/12

CPC classification number: G11B5/40 ,  G11B5/3143

Abstract: A magnetic head assembly comprises an air-bearing slider 10 carrying two pole pieces P1, P2 surrounded by insulating material 12, 14, 18, 20 and 22. A read/write spiral coil 16 is connected by conductor 28 to a stud 26 and external connector 24. Electrostatic charge can accummulate in the insulating material and to prevent discharge of this charge via the pole pieces P1, P2 and alternative discharge path is provided. This path is provided by buried conductor (not shown) extending from the stud 26 to the edge of the insulating layer 12. This conductor forms part of the alternative discharge path, marked desirable discharge path. The path is completed by the spark discharge gap between the conductor and the conductive slider 10 which is connected to earth. The resistance of the desirable discharge path is made substantially less than that of the undesirable discharge path via the pole pieces.