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91. 发明专利

JPH08138204A PERPENDICULAR MAGNETIC RECORDING HEAD 失效
公开(公告)号：JPH08138204A
公开(公告)日：1996-05-31
申请号：JP29784994
申请日：1994-11-07
申请人： OOPACK KK
发明人： YOSHIDA MAKOTO
IPC分类号： G11B5/39 , G11B5/02 , G11B5/127 , G11B5/17 , G11B5/245 , G11B5/265 , G11B5/29
摘要： PURPOSE: To prevent noises, etc., by bringing one single pole into sufficient proximity to a position where recording or reproducing to or from a recording medium is possible and arranging the other single pole apart >=4 times the min. magnetization inversion spacing from the recording medium. CONSTITUTION: The magnetic recording layer R1 of the recording medium R is formed with magnetization M in a perpendicular direction via the single pole 11 and recording is executable by feeding recording signals to a coil 14 of a magnetic head 10 at the time of recording a desired information on the recording medium R. At this time, the single pole 21 of the magnetic head 20 is arranged in the position apart >=4 times the min. magnetization inversion spacing from the surface of the recording medium R when the recording signals are sent to the coil 24 of the magnetic head 20 as well and, therefore, magnetism does not act on the magnetization recording layer R1 of the recording medium R but the recording signals are preferably sent to the coil 14 alone.

92. 发明专利

JP2502017B2 失效
公开(公告)号：JP2502017B2
公开(公告)日：1996-05-29
申请号：JP31327192
申请日：1992-11-24
申请人： TOSHIBA KK , TOSHIBA KONPYUUTA ENJINIARINGU KK
发明人： OKAMURA HIROSHI , KUSUNOKI MASAHIRO , OOHASHI HIROSHI , SAITO TOSHA
IPC分类号： G11B5/09 , G11B5/265 , G11B5/29 , G11B5/60

93. 发明专利

JPH08106611A MAGNETIC HEAD 失效
公开(公告)号：JPH08106611A
公开(公告)日：1996-04-23
申请号：JP24107194
申请日：1994-10-05
申请人： SONY CORP
发明人： KATAKURA TORU
IPC分类号： G11B5/265
摘要： PURPOSE: To prevent a reproducing output from being lowered by providing a notched part on a part of a magnetic core constituting an erase head chip. CONSTITUTION: A floppy head is constituted of a recording/reproducing head chip 1 having a recording/reproducing gap g1 and an erase head chip 2 having an erase gap g2 , and they are joined and integrated through a non-magnetic material 3. The recording/reproducing head chip 1 is constituted of a central core 4, a side core 5 gap joined to the side surface of the core 4 and a back core 6 touching to the leg parts of the central core 4 and the side core 5 and constituting a closed magnetic path. Then, in the floppy head, the notched part 9 is provided on a part of the side core 8 constituting the erase head chip 2. The notched part 9 is provided so that a part of the side core 8 in contact with the back core 6 is notched partially, since a magnetic core cross-sectional area in the notched part becomes smaller than other parts, saturation occurs in the notched part even when an erase current flows much through the erase head chip 2. Thus, the reproducing output is suppressed.

94. 发明专利

JPH0845018A MAGNETIC HEAD AND ITS PRODUCTION 失效
公开(公告)号：JPH0845018A
公开(公告)日：1996-02-16
申请号：JP17671794
申请日：1994-07-28
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： WATANABE OSAMU , MORI TAIICHI
IPC分类号： G11B5/265 , G11B5/127 , G11B5/23
摘要： PURPOSE:To suppress Barkhausen noises and to obtain good recording and reproducing characteristics by confining the difference in the coefft. of thermal expansion at the glass transition temp. of magnetic cores between primary fused glass and secondary fused glass and the magnetic cores within a prescribed range. CONSTITUTION:The coefft. of thermal expansion at the glass transition temp. of the primary fused glass 13 used for formation of the magnetic gap (not shown in Fig.) of a magnetic head having the magnetic core 1 for recording and reproducing consisting of ferrite and the magnetic core 2 for erasing is defined as alphaG1. The coefft. of thermal expansion at the glass transition temp. of the ferrite used for the magnetic cores 1, 2 is defined as alphaF The primary fused glass 13 of which the difference between alphaG1 and alphaF attains a range of -4.0X10

95. 发明专利

JPH07320225A HEAD DEVICE OF TAPE RECORDER 失效
公开(公告)号：JPH07320225A
公开(公告)日：1995-12-08
申请号：JP10655494
申请日：1994-05-20
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： ISHIOKA KIYOSHI
IPC分类号： G11B5/265 , G11B5/024
摘要： PURPOSE:To stabilize the tape touch of an erase head to which a tape pad does not act and to increase the erase effect without affecting the tape running characteristic, in a head device for the reversal running for audio, on which a sound recording/reproducing head and erase head are constituted integrally with each other. CONSTITUTION:The sound recording/reproducing head 1 is mounted on a head holder 3 so that a head core part 1a has a tilt angle of 0-60' in the projecting direction to the surface of the magnetic tape for all of the width of the tape 4a. Similarly, the erase head 2 is also mounted on the head holder 3 so that a head core part 2a has a tilt angle of 0-90' in the same direction, i.e., the projecting direction to the surface of the magnetic tape. Also, these heads are mounted and fixed in such a relation that the side of the erase head 2 is protruded more than the sound recording/reproducing head 1.

96. 发明专利

JPH07114003B2 失效
公开(公告)号：JPH07114003B2
公开(公告)日：1995-12-06
申请号：JP15075987
申请日：1987-06-17
IPC分类号： G11B5/33 , G11B5/09 , G11B5/265

97. 实用新型

JPH0749608Y2 失效
公开(公告)号：JPH0749608Y2
公开(公告)日：1995-11-13
申请号：JP15246785
申请日：1985-10-07
IPC分类号： G11B5/265

98. 发明专利

JPH07272230A COMPOSITE TYPE MAGNETIC HEAD 失效
公开(公告)号：JPH07272230A
公开(公告)日：1995-10-20
申请号：JP6179094
申请日：1994-03-30
申请人： SONY CORP
发明人： HASHISHITA TOSHIHIRO
IPC分类号： G11B5/465 , G11B5/024 , G11B5/127 , G11B5/265
摘要： PURPOSE:To remove the magnetization generated in a magnetic head for reproducing and to avert moire defects by passing an erasing current to a magnetic head for erasing when a composite type magnetic head does not come into contact with a magnetic recording medium. CONSTITUTION:Magnetic fluxes are picked up by tracing the tracks of the magnetic recording medium 10 and reproduced output is obtd. in the same manner as for the ordinary magnetic head for reproduction in a reproducing state when the composite type magnetic head 1 comes into contact with the medium 10. However, the head 1 is formed by integrating the magnetic head 1A for reproducing and the magnetic head 1B for erasing with one magnetic head and, therefore, the erasing current is supplied via a coil 13 to the erasing head in the blanking state when a rotary drum 15 does not come into contact with the medium 10. As a result, the generated magnetization is removed by this erasing current even if the magnetization is generated. The generation of the moire defects appearing as noises in reproduced signals does not, therefore, arise and the sufficient reproduced output is obtd.

99. 发明专利

JPH07262518A MAGNETIC HEAD 失效
公开(公告)号：JPH07262518A
公开(公告)日：1995-10-13
申请号：JP5013194
申请日：1994-03-22
申请人： SONY CORP
发明人： FUTAGAMI SHINTARO
IPC分类号： G11B5/60 , G11B5/127 , G11B5/265
摘要： PURPOSE:To improve the characteristics and productivity of a magnetic head by providing a nonmagnetic reinforcing member with a projecting part which extends in the depth direction of magnetic gaps by projecting in the track width direction of the magnetic gaps in a magnetic head chip holding hole. CONSTITUTION:This magnetic head is formed of first and second magnetic head chips 1, 2 and the nonmagnetic reinforcing member 4 having the magnetic head chip holding hole 3 facing medium-sliding surfaces 1a, 1b. The first, second magnetic head chips 1, 2 in the state of magnetically insulating the chips are so fitted into the holding hole 3 that the respective magnetic gaps g1, g2 face the medium-sliding surfaces. The chips are fixed by glass 6. The nonmagnetic reinforcing part 4 is provided with the projecting part 19 which projects in the track width direction of the magnetic gaps g1, g2 in the holding hole 3 and extends in the depth direction of the magnetic gaps g1, g2. The first and second head chips 1, 2 are so disposed as to hold the projecting part 19 therebetween. These chips are magnetically insulated. The degradation in the electromagnetic conversion characteristics of the magnetic head and the generation of production defects are obviated.

100. 发明专利

JPH07254039A MAGNETIC DATA PROCESSOR 失效
公开(公告)号：JPH07254039A
公开(公告)日：1995-10-03
申请号：JP4270094
申请日：1994-03-14
申请人： OKI ELECTRIC IND CO LTD
发明人： GOTO MASAO
IPC分类号： G06K7/08 , G11B5/265 , G11B5/29
摘要： PURPOSE:To unnecessitate a head moving mechanism and to miniaturize the mechanism by arranging a magnetic detection element on the head surface opposed to a magnetic data recording surface in an array state over the magnetic data recording range. CONSTITUTION:A head driving mechanism 11 is provided with an actuator 13 on which a piezoelectric element is laminated to slide and move a carridge 3 in the direction of the arrow A-B against a spring 12 for bias. At the time of processing magnetic information, a magnetic stripe 23 being a record carrier in a bankbook 20 is pressed on the magnetic head 2 of a magnetic data processor 1 by a pressing member 21 and a spring 22. On the head surface of the magnetic head 2, a magnetic detection element reproducing magnetic data as an electric signal and a magnetic circuit element converting the electric signal into a magnetic field are arranged in an array state over the recording range of the magnetic data recorded on the magnetic recording surface of the magnetic stripe 23. Therefore, the recorded magnetic data can be reproduced as the electric signal without moving the head opposite to the magnetic data recording surface.

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