CN1295679C - Magnetic recording/producing device - Google Patents
Magnetic recording/producing device Download PDFInfo
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- CN1295679C CN1295679C CNB988017091A CN98801709A CN1295679C CN 1295679 C CN1295679 C CN 1295679C CN B988017091 A CNB988017091 A CN B988017091A CN 98801709 A CN98801709 A CN 98801709A CN 1295679 C CN1295679 C CN 1295679C
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Abstract
A helical scan magnetic recording/reproducing device having an MR reproducing magnetic head wherein data to be recorded on a magnetic tape is converted through a modulation circuit into a DC-free code sequence. The device comprises a high-pass filter for attenuating the low frequency components of a reproduced signal picked up by an MR head, and a circuit for demodulating the reproduced signal from the high-pass filter to produce data before being converted into th DC-free code sequence. The low band noise (thermal asperity) produced due to the contact of the magnetic tape with the MR head is removed and a noise-suppressed reproduction output can be obtained. A rotary transformer mounted on a rotary drum is employed as the high-pass filter.
Description
Technical field
The present invention relates to a kind of helical scan type magnetic recording/reproducing apparatus, this equipment comprises a magnetoresistance effect head, and this magnetic head reappears magnetic head as it.
Background technology
Such magnetic recording/the reproducing apparatus of data-storage system that resembles video tape recorder, blattnerphone and computing machine is applicable to a kind of spiral scan method, thereby increase recording density so that the increase capacity, every kind of magnetic recording/reproducing apparatus all adopts the tape as recording medium.
Now required the magnetic recording/reproducing apparatus of aforementioned type can further increase recording density and increase capacity.In order further to increase recording density and increase capacity, invented a kind of method, it adopts one helical scan type magnetic recording/reproducing apparatus, and this equipment comprises a magnetoresistance effect head (hereinafter being called " MR head "), and this magnetic head reappears magnetic head as one.
The MR head is a kind of magneto-resistance effect device magnetic head of (hereinafter being called " MR device ") that comprises, this magneto-resistance effect device is as the Magnetic Sensor that detects a recording medium magnetic field.In the practical application, the reproduction magnetic head of MR head as a hard disk drive.Usually, the sensitivity MR head that is better than an induction type magnetic head sensitivity can access a lot of reproduction output quantities.When the MR head is used as the reproduction magnetic head, can realize higher recording density and bigger capacity.
Hard disk drive is fixed on one with the MR head and floats on the slide plate (float slider), in order at MR head playing data for broadcasting under the state that floats on this disk.On the other hand, when the MR head is suitable for this spiral scan method, the MR head under the state that slides on the tape from this tape playing data for broadcasting.
If the MR head slides on tape, a lot of variation then taken place aspect reproduction output level (levels), although can from the MR head, obtain a lot of reproduction output quantities, but also produce excessive noise.So this can cause the problem that can't obtain stable output.Another problem is, do not export any reproducing signal, unlocked frequency promptly occurs.Therefore, will not comprise that yet helical scan type magnetic recording/the reproducing apparatus as the MR head that reappears magnetic head drops into practical application.
Summary of the invention
The purpose of this invention is to provide a kind of helical scan type magnetic recording/reproducing apparatus, this equipment comprises one as the MR head that reappears magnetic head, and can access stable reproduction output quantity.
Magnetic recording/reproducing apparatus according to the present invention is a kind of helical scan type magnetic recording/reproducing apparatus, and it comprises: one is fixed on the MR head on the rotary head drum; One Hi-pass filter; And demodulating equipment; One rotary transformer.This MR head is fixed on the rotary head drum, so that detect a reproducing signal from a tape, has recorded the data that are converted to no DC sign indicating number chain (DC-free code trains) on this tape.This Hi-pass filter makes to be included in by the low frequency component in MR the detected reproducing signal decays.This demodulating equipment is demodulating data under a state, data are converted to no DC sign indicating number chain from reproducing signal under this state, and the low frequency component of this reproducing signal is decayed by Hi-pass filter.Rotary transformer is used for to stationary part transmission by the detected reproducing signal of described magnetoresistance effect head that is fixed on the described rotary head drum.Wherein, the cutoff frequency of described Hi-pass filter is not less than the noise frequency in the low frequency region, this cutoff frequency is determined by the mutual inductance of the output resistance of a reproducing amplifier, described rotary transformer and the input resistance of an equipment side circuit, this reproducing amplifier is used for amplifying the detected reproducing signal of described magnetoresistance effect head, this equipment side circuit is connected to the stationary part of described rotary transformer, produces this noise frequency when during reappearing this signal a tape and described magnetoresistance effect head being in contact with one another.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, a cutoff frequency of wherein said Hi-pass filter is not higher than the low-limit frequency of the signal frequency range that is recorded on the tape.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, wherein a cutoff frequency of described Hi-pass filter is f[Hz during supposition reappears this signal], and the relative velocity between described tape and the described magnetoresistance effect head is V[m/s] time, satisfy following relation:
f[Hz]＞50×10
3[m
-1]×V[m/s]。
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, the cutoff frequency of wherein said Hi-pass filter is 500kHz or higher.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, the data that are recorded on this tape are that an existing error correction code adds data wherein, and an error correction device is provided, and it makes described demodulating equipment demodulated data stand an error recovery procedure according to this error correction code.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, also comprise: modulating device, it is used for the data-modulated that is recorded on the tape is the data that need not DC sign indicating number chain form; With a write head, it is fixed on the described rotary head drum, and is configured to the data of described modulating device modulation are recorded on the tape.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, also comprise the error codes adding set, it is used for an error correction code added to by described write head and is recorded in the data on the tape.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention; wherein paired magnetoresistance effect head is set to described magnetoresistance effect head; and in this paired magnetoresistance effect head each is all set a predetermined position angle; paired write head is set to described write head; and in this paired write head each is all set a predetermined position angle; when being recorded in data on the tape; described paired write head carries out guard bandless recording when data being recorded on this tape; and when playing data for broadcasting from this tape, described paired magnetoresistance effect head reappears by described paired write head by the guard bandless recording recorded data.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, wherein said magnetoresistance effect head comprises a Magnetic Sensor, this Magnetic Sensor detects a magnetic field from tape, and this Magnetic Sensor is one to have the magneto-resistance effect device of magnetoresistance, and described magnetoresistance effect head is equipped with a soft magnetic film, and this soft magnetic film is pressed on the described magneto-resistance effect device by an insulating film layer.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, wherein said magnetoresistance effect head is fixed on the described rotary head drum, so that at least a portion of described magnetoresistance effect head reaches on the outside surface of described rotary head drum.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, the tape slidingsurface of wherein said magnetoresistance effect head has been worn into cylindrical on a glide direction, and with the perpendicular direction of this glide direction on worn into cylindrically, wherein said magnetoresistance effect head slides on tape along this glide direction.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, also comprise the contact pressure control device, be used for controlling the contact pressure between tape and the described magnetoresistance effect head.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, also comprise power transmission device, be used for to the described magnetoresistance effect head power supply that is fixed on the described rotary head drum.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, wherein said tape is the tape with a metal magnetic layer, and this metal magnetic layer is formed on its non magnetic support member.
According to above-mentioned magnetic recording/reproducing apparatus of the present invention, wherein said tape is one to have the tape of carbon type film, and this carbon type film is formed on its surface.
The present invention also provides a kind of helical scan type magnetic recording/reproducing apparatus, comprising:
One magnetoresistance effect head, it is fixed on the rotary head drum, and is set to the reproducing signal that can detect from a tape, has recorded on this tape and has been converted to the data that need not DC sign indicating number chain; One Hi-pass filter, its low frequency component in the detected reproducing signal of described magnetoresistance effect head that is used for decaying; Demodulating equipment, it is used for being converted under the state before need not DC sign indicating number chain demodulating data from reproducing signal in data, and the low frequency component of this reproducing signal is by described Hi-pass filter decay; And a write head, it is fixed on the described rotary head drum, and is configured to the data of described modulating device modulation are recorded on the tape; Wherein paired magnetoresistance effect head is set to described magnetoresistance effect head, and all sets a predetermined position angle in this paired magnetoresistance effect head each; Paired write head is set to described write head, and all sets a predetermined position angle in this paired write head each; When being recorded in data on the tape, described paired write head carries out guard bandless recording when data being recorded on this tape; When playing data for broadcasting from this tape, described paired magnetoresistance effect head reappears by described paired write head by the guard bandless recording recorded data; And the width of the Magnetic Sensor of described magnetoresistance tape part, greater than by the track width of described write head by the magnetic track record that guard bandless recording write down, and less than total track width of two adjacent magnetic track records.
The present invention also provides a kind of helical scan type magnetic recording/reproducing apparatus, comprise: a magnetoresistance effect head, it is fixed on the rotary head drum, and is set to the reproducing signal that can detect from a tape, has recorded on this tape and has been converted to the data that need not DC sign indicating number chain; One Hi-pass filter, its low frequency component in the detected reproducing signal of described magnetoresistance effect head that is used for decaying; And demodulating equipment, it is used for being converted under the state before need not DC sign indicating number chain demodulating data from reproducing signal in data, and the low frequency component of this reproducing signal is by described Hi-pass filter decay; Wherein said magnetoresistance effect head comprises a Magnetic Sensor device, and this device detects a magnetic field from tape, and this device is supported by paired magnetic cup.
The present invention also provides a kind of helical scan type magnetic recording/reproducing apparatus, comprise: a magnetoresistance effect head, it is fixed on the rotary head drum, and is set to the reproducing signal that can detect from a tape, has recorded on this tape and has been converted to the data that need not DC sign indicating number chain; One Hi-pass filter, its low frequency component in the detected reproducing signal of described magnetoresistance effect head that is used for decaying; And demodulating equipment, it is used for being converted under the state before need not DC sign indicating number chain demodulating data from reproducing signal in data, and the low frequency component of this reproducing signal is by described Hi-pass filter decay; Wherein said magnetoresistance effect head comprises a Magnetic Sensor device and a permanent magnet, and this device detects the magnetic field from tape, and this device is one to have the magneto-resistance effect device of magnetoresistance, and described permanent magnet is arranged on the both sides of described magneto-resistance effect device.
According to foregoing invention, when by tape and MR head are slided each other from this tape during playing data for broadcasting, be contained in from the noise in the reproduction output quantity of MR head and contain multiple low frequency component usually.Magnetic recording/reproducing apparatus according to the present invention comprises Hi-pass filter, and it is decayed by contained low frequency component in MR the detected reproducing signal.Therefore, can remove effectively by contained noise in MR the detected reproducing signal according to magnetic recording/reproducing apparatus of the present invention.In addition, by being the data that are converted to no DC sign indicating number chain according to the data that magnetic recording/reproducing apparatus of the present invention reappeared.Therefore, if Hi-pass filter decay low frequency component, playing data for broadcasting reliably then.
Description of drawings
Fig. 1 is a skeleton view, represents the structure example of a rotary head drum unit, and this rotary head drum unit is fixed on one according on magnetic recording/reproducing apparatus of the present invention;
Fig. 2 is a planimetric map, represents the simple structure of a tape travel mechanism example, and the rotary head drum unit is equipped with in this mechanism;
Fig. 3 is a curve map, and expression is when the noise spectrum distribution example that causes during playing data for broadcasting by making the mutual slip of a MR head and a tape;
Fig. 4 is a sectional view, the inner structure of expression rotary head drum unit;
Fig. 5 is the simple circuit structure of expression rotary head drum and the synoptic diagram of peripheral circuit thereof;
Fig. 6 is the figure of expression one circuit, and this circuit equivalent is in a zone, and to an equipment side circuit, this reproducing amplifier is connected to the rotating part of a rotary transformer from a reproducing amplifier in this zone, and this equipment side circuit is connected to the stationary part of this rotary transformer;
Fig. 7 is a skeleton view, and expression is fixed on an example of the MR head on the rotary head drum;
Fig. 8 is a planimetric map, and MR head is in the past seen in expression from the surface that tape slips in the above;
Fig. 9 is a synoptic diagram, expression MR head work in case from the tape a kind of state of playing data for broadcasting;
Figure 10 is a curve map, is illustrated in one and does not make this signal by not writing down the signal example that any data tape reappears by the MR head from one under the Hi-pass filter state as yet;
Figure 11 is a curve map, is illustrated in one and does not make this signal by recording the signal example that data tape reappears by the MR head from one under the Hi-pass filter state as yet;
Figure 12 is a curve map, is illustrated in one and has made this signal by recording the signal example that data tape reappears by the MR head from one under the Hi-pass filter state.
Embodiment
Embodiments of the invention are described now.
Magnetic recording/reproducing apparatus according to the present invention is the magnetic recording/reproducing apparatus of a tape as recording medium.For example, equipment according to the present invention is used as the data-storage system of video tape recorder, blattnerphone or computing machine.Magnetic recording/reproducing apparatus according to the present invention is a kind of helical scan type magnetic recording/reproducing apparatus, and it is equipped with and is used for the rotary head drum of recording data.One MR head is used as the reproduction magnetic head that is fixed on this rotary head drum.
Fig. 1 and 2 represents the structure example of a rotary head drum unit, and this rotary head drum unit is fixed on according on magnetic recording/reproducing apparatus of the present invention.Fig. 1 is a skeleton view, schematically shows the structure of a rotary head drum unit 1.Fig. 2 is a planimetric map, schematically shows a tape travel mechanism 10, and this mechanism 10 comprises rotary head drum unit 1.
As shown in Figure 1, rotary head drum unit 1 comprises: the static magnetic drum 2 of a cylindrical shape; One cylindrical shape rotary head drum 3; One motor 4, it is used for rotating rotary head drum 3; Paired induction magnetic head 5a and 5b, they are fixed on the rotary head drum 3; With paired MR 6a and 6b, they are fixed on the rotary head drum 3.
Be to be noted that a kind of usually said upper drum rotary head drum unit 1 of present description, this unit 1 comprises the rotary head drum 3 that is fixed on the static magnetic drum 2.The present invention can be widely used in helical scan type magnetic recording/reproducing apparatus.Therefore, the type of rotary head drum unit is unrestricted.For example, can adopt a kind of usually said intermediate magnetic drum type rotary head drum unit, this unit comprises a rotary head drum of paired static magnetic drum clamping.
The static magnetic drum 2 of rotary head drum unit 1 is a kind of non-rotary magnetic drum, promptly is a kind of magnetic drum that is held as mentioned above.Form guide rail part 8 along a direction in the side surface of static magnetic drum 2, tape 7 moves on this direction.As described later, when executive logging/reproduction process, tape 7 moves along guide rail part 8.Be provided with rotary head drum 3 to such an extent that its central shaft is overlapped with the central shaft of static magnetic drum 2.
Each induction magnetic head 5a and 5b are write heads, and wherein paired magnetic core interconnects by a magnetic gap.In addition, a coil is on this magnetic core.When data being recorded on the tape 7, use induction magnetic head 5a and 5b.Induction magnetic head 5a and 5b are fixed on the rotary head drum 3, and making induction magnetic head 5a and 5b is 180 ° with respect to the center angle of rotary head drum 3.In addition, the magnetic gap of induction magnetic head 5a and 5b partly reaches on the outside surface of rotary head drum 3.Induction magnetic head 5a and 5b are arranged to relative position angle, thereby carry out unprotect frequency band (guard-band-less) record of tape 7 with a predetermined party parallactic angle.This position angle is preferably 5 °～30 °.
Aforementioned induction magnetic head 5a and 5b can be known write heads, and they have been used for traditional helical scan type magnetic recording/reproducing apparatus.Specifically, preferably adopt usually said MIG (the metal M etal In Gap in a magnetic gap) magnetic head, this magnetic head comprises the magnetic core that a kind of soft magnetic material such as ferrite are made, and also comprises the metal magnetic film that is formed on this soft magnetic material.In addition, paired magnetic core interconnects, and the metal magnetic film is oppositely arranged by a magnetic gap.
On the other hand, MR 6a and 6b reappear magnetic head, and they comprise the MR device as Magnetic Sensor, are used for detecting the magnetic signal from tape 7.When playing data for broadcasting from tape 7, use MR 6a and 6b.MR 6a and 6b are fixed on the rotary head drum 3, make MR 6a and 6b about the center of rotary head drum 3 180 ° of angles each other.In addition, the part that is provided with the MR device reaches on the outside surface of rotary head drum 3.MR 6a and 6b are configured to have and induction magnetic head 5a and the similar position angle of 5b, so that detect with the magnetic signal of a predetermined party parallactic angle guard bandless recording on tape 7.
By slip tape 7 on rotary head drum unit 1, magnetic recording/reproducing apparatus is recorded in data on the tape 7, and from the tape 7 playing data for broadcasting.
Specifically, when carrying out recording operation, as shown in Figure 2, carry tape 7, make tape 7 on rotary head drum unit 1 by deflector roll (guide roller) 12 and 13 from feed wheel 11.Like this, executive logging/reproduction process on rotary head drum unit 1.
When data being recorded on the tape 7, paired induction magnetic head 5a and 5b and tape 7 relative slips.Like this, induction magnetic head 5a and 5b carry out the guard bandless recording operation.When playing data for broadcasting from tape 7, a paired MR 6a and 6b and tape 7 relative slips.Like this, reappeared by MR 6a and 6b by paired induction magnetic head 5a and 5b recorded data.
Make the tape 7 that is subjected to the 1 recording processing of rotary head drum unit can pass through deflector roll 14 and 15, driving wheel 16 and deflector roll 17, thereby move to winding roller 18.That is to say that driving wheel 16 moves tape 7 under a predetermined pull and predetermined speed, driving wheel 16 is by capstan motor 19 rotations.Then, tape 7 and induction magnetic head 5a and 5b and MR 6a and 6b are contacted so that in a predetermined contact pressure lower slider, wherein these magnetic heads are fixed on the rotary head drum 3 of rotation.Then, tape 7 is on winding roller 18.
As mentioned above, rotary head drum unit 1 is equipped with driving wheel 16, and driving wheel 16 is by capstan motor 19 rotation and as a contact pressure control device, and this control device is used for controlling the contact pressure between induction magnetic head 5a and 5b and MR 6a and 6b and the tape 7.
When mobile tape 7 as mentioned above, rotary head drum 3 shown in arrow A among Fig. 1 by motor 4 rotations.
On the other hand, tape 7 moves along the guide rail part 8 of static magnetic drum 2, so that slide sideling on static magnetic drum 2 and rotary head drum 3.That is to say that shown in arrow B among Fig. 1, tape 7 from tape entry partly moves on a tape motion direction of being scheduled to along guide reel part 8, so that slide on static magnetic drum 2 and rotary head drum 3.Then, shown in arrow C among Fig. 1, tape 7 moves to the tape exit portion.
In the operating process of MR 6a and 6b playing data for broadcasting, when MR 6a with 6b during with tape 7 relative slips, contacting with sliding between MR 6a and 6b and the tape 7 produces heat of friction.The influence of heat of friction has changed the temperature (hereinafter being called " MR magnetic head temperature ") of MR 6a and 6b.Usually, it is relevant with temperature with the MR device on the 6b to be fixed on MR 6a.If this temperature variation then produces noise in reappearing output.The noise that is caused by MR magnetic head temperature variation is called hot unevenness (asperity).
The spectrum distribution example of expression noise among Fig. 3, thus when when making MR 6a and 6b and tape 7 work relative slips and playing data for broadcasting, produce this noise.Among Fig. 3, oblique line part is corresponding to hot unevenness.As shown in Figure 3, hot unevenness concentrates on low frequency range.Its reason is that the magnetic head variation of temperature is a low frequency variations.Specifically, the relative velocity of supposing 7 of MR 6a and 6b and tapes is V[m/s], then hot unevenness district is not higher than one by 50 * 10
3[m
-1] * V[m/s] expression frequency.If the relative velocity V that MR 6a and 6b and tape are 7 is 10m/s, then hot unevenness district is not higher than 500kHz.
As described later, the low frequency component in reproducing signal is decayed, thereby removes the unevenness of reducing phlegm and internal heat, and obtains the signal that noise component is wherein decayed.
By MR 6a carried out in the process of data reproduction with tape 7 relative slips with 6b, if snotter draws between MR 6a and 6b and the tape 7, usually said signal drop-out (dropout) appears then.As described later, present embodiment has a kind of like this structure, the leakage of reproducing signal even occurs, then carries out an error recovery procedure, so that raw data obtains reappearing.
Preferably, rotary head drum 3 diameters of above-mentioned rotary head drum unit 1 are about 10mm～60mm.In addition, the rotating speed of rotary head drum 3 is about 500rpm～8000rpm.Can change the diameter and the rotating speed of rotary head drum 3 arbitrarily, to satisfy the requirement of system.If the diameter of rotary head drum 3 is big and rotating speed is high, the then relative velocity raising of 7 of an induction magnetic head 5a and 5b and MR 6a and 6b and tapes.Thus, there is the surface of induction magnetic head 5a that tape slides and 5b and MR 6a and 6b easily impaired on it.Like this, its lost of life.Especially, MR 6a that has on it that tape slides and the surface abrasion of 6b easily influence MR 6a and 6b.If the surface that has tape to slide on it is worn, then performance reduces widely.Therefore, preferably, be the diameter of rotary head drum 3 and speed setting some values like this, MR the 6a and the 6b that promptly have these values can have the in fact gratifying life-span, and these values satisfy above-mentioned scope.
The inner structure of rotary head drum unit 1 is described now with reference to Fig. 4.
As shown in Figure 4, a turning axle 21 inserts the middle body of static magnetic drum 2 and rotary head drum 3.Be to be noted that static magnetic drum 2, rotary head drum 3 and turning axle 21 made by conductive material, so that above-mentioned parts is electrically connected mutually.Static magnetic drum 2 ground connection.
For axle sleeve (sleeve) inside of static magnetic drum 2 is provided with two bearings 22 and 23.Like this, with respect to static magnetic drum 2 rotation supporting rotating shafts 21.That is to say that with respect to static magnetic drum 2, turning axle 21 is subjected to the rotation of bearing 22 and 23 and supports.On the other hand, the inside for rotary head drum 3 is provided with a flange 24.Flange 24 is fixed to the upper end of turning axle 21.Like this, rotary head drum 3 can rotate synchronously with the rotation of turning axle 21.
Adorn a rotary transformer 25 in the rotary head drum unit 1, this rotary transformer 25 is a kind of non contact signal transmission unit, and it is used for transmission signals between static magnetic drum 2 and rotary head drum 3.This rotary transformer 25 comprises a stator 26 and one rotor core 27 unshakable in one's determination, and stator core links to each other with static magnetic drum 2, and rotor core 27 links to each other with rotary head drum 3.
Electric power transfer ring 26d and 27d provide and make a paired MR 6a and the required electric power of 6b work.That is to say that rotary head drum unit 1 comprises the electric power transfer ring 26d and the 27d of rotary transformer 25, they constitute the supply unit to MR 6a and 6b power supply.
The motor 4 that is used for rotary head drum 3 is rotated is connected to rotary head drum unit 1.This motor 4 comprises a rotor 28 and a stator 29, and rotor 28 is rotating parts, and stator 29 is stationary parts.Rotor 28 is connected to the lower end of turning axle 21, and is equipped with an actuating magnet 30.On the other hand, stator 29 is connected to the lower end of static magnetic drum 2, and is equipped with an operating coil 31.When an electric current passes through operating coil 31, rotor 28 rotations.Thus, be connected to turning axle 21 rotations of rotor 28.Synchronous with this rotation, be fixed to rotary head drum 3 rotations on the turning axle 21.
Describe the recording operation of being carried out rotary head drum unit 1 now with reference to Fig. 5, Fig. 5 schematically shows the circuit and the peripheral circuit thereof of rotary head drum unit 1.
When making rotary head drum unit 1 work when data being recorded on the tape 7, an electric current offers motor 4 operating coils 31.Like this, rotary head drum 3 rotations.Under rotary head drum 3 rotating states, as shown in Figure 5, provide a tracer signal to scrambler 41 from external circuit 40.
Supplied with 41 pairs of this tracer signal decodings of scrambler of this tracer signal from external circuit 40, and added a predictive error correcting code.That is to say that this scrambler 41 is as an error correction code adding set, it is deciphered the tracer signal from external circuit 40, and error correction code is added to the data that must be recorded on the tape 7.Added the data of error correction code by scrambler 41, be provided for a modulation circuit 42.
Specifically, this modulation can be the modulation that is used for carrying out so-called 8-10 conversion, so that the data that have been added error correction code and formed a block code are converted to 10 per 8 bit code data, so that form the no DC sign indicating number chain that has wherein limited the low frequency range intermediate frequency spectrum.As its replacement scheme, this modulation can make the modulation that is used for carrying out so-called 8-9 conversion, so that the data that have been added error correction code and formed a block code are converted to 9 per 8 bit code data, so that form the no DC sign indicating number chain that has wherein limited the low frequency range intermediate frequency spectrum.As its replacement scheme, can adopt (Miller2) method of a kind of mirror image square (mirror square).
The data of the no DC sign indicating number chain form of output are provided for record amplifier 43 or record amplifier 44 from modulation circuit 42.Synchronous with the rotation of rotary head drum 3, modulation circuit 42 is supplied with record amplifier 43 or record amplifier 44 with data.That is to say that in induction magnetic head 5a record data, modulation circuit 42 is with the record amplifier 43 of data supply corresponding to induction magnetic head 5a.In induction magnetic head 5b record data, modulation circuit 42 is supplied with data and the corresponding record amplifier 44 of induction magnetic head 5b.
Be supplied to record amplifier 43, will be amplified to a predetermined level, so that this tracer signal is supplied with the signal transmission ring 26a of stator core 26 corresponding to the tracer signal of above data from the no DC sign indicating number chain form data of modulation circuit 42.Similarly, be supplied to record amplifier 44, will be amplified to a predetermined level, so that this tracer signal is supplied with the signal transmission ring 26b of stator core 26 corresponding to the tracer signal of above data from the no DC sign indicating number chain form data of modulation circuit 42.
As mentioned above, paired induction magnetic head 5a and 5b are configured to become 180 ° of angles relatively about the center of rotary head drum 3.Therefore, induction magnetic head 5a and 5b replace record data with 180 ° of phase differential.That is to say, with 180 ° phase differential alternately switch from record amplifier 43 to provide the time of tracer signal with the corresponding signal transmission of induction magnetic head 5a ring 26a and from record amplifier 44 to providing time of tracer signal with the corresponding signal transmission of induction magnetic head 5b ring 26b.
Under contactless mode, the tracer signal of supplying with the signal transmission ring 26a of induction magnetic head 5a is transferred to the signal transmission ring 27a of rotor core 27.The tracer signal that is transferred to the signal transmission ring 27a of rotor core 27 is supplied to induction magnetic head 5a.Like this, induction magnetic head 5a is recorded in data on the tape 7.
Similarly, under contactless mode, supply with the signal transmission ring 27b that is transferred to rotor core 27 with the tracer signal of the corresponding signal transmission of induction magnetic head 5b ring 26b.The tracer signal that is transferred to the signal transmission ring 27b of rotor core 27 is supplied to induction magnetic head 5b.Like this, induction magnetic head 5b is recorded in data on the tape 7.
When rotary head drum unit 1 work during with playing data for broadcasting from tape 7, carry out a process that is similar to record data, thereby with the operating coil 31 of a current supply motor 4.Like this, rotary head drum 3 rotations.
Under the state of rotary head drum 3 rotations, as shown in Figure 5, provide a high-frequency current to an analog line driver 52 from an oscillator 51.By analog line driver 52 is the high frequency current transitions from oscillator 51 one predetermined AC electric current, then it is supplied with the electric power transfer ring 26d of stator core 26.
Under contactless mode, the AC electric current of supplying with the electric power transfer ring 26d of stator core 26 is transferred to the electric power transfer ring 27d of rotor core 27.The AC electric current that is transferred to the electric power transfer ring 27d of rotor core 27 by 53 pairs in rectifier carries out rectification, so that make it form the DC electric current of supplying with pressure regulator 54.By pressure regulator 54 with above-mentioned AC current settings to a predetermined voltage level.
As detecting electric current, the electric current that is set to a predetermined voltage level by pressure regulator 54 is supplied to a paired MR 6a and 6b.Be to be noted that the reproducing amplifier 55 that is used for detecting from the signal of MR 6a and 6b transmission, be connected to a paired MR 6a and 6b.And be supplied to reproducing amplifier 55 from the electric current of pressure regulator 54.
As described later, MR 6a and 6b are equipped with the MR device, and each MR device all has a resistance, change its resistance according to the intensity of external magnetic field.Change the resistance of the MR device of MR 6a and 6b by the magnetic field of tape 7 signal that produces.The voltage that detects electric current is changed.Reproducing amplifier 55 detects the variation of this voltage, so that handle is exported as tracer signal with the corresponding signal of the variation of this voltage.
Be to be noted that when reproducing amplifier 55 detects and exports the signal that is reproduced the rotation synchronised of reproducing amplifier 55 and rotary head drum 3 is carried out one and switched operation.That is to say, in MR 6a playing data for broadcasting, the record data that reproducing amplifier 55 outputs are detected by MR 6a.In MR 6b playing data for broadcasting, the tracer signal that reproducing amplifier 55 outputs are detected by MR 6b.
As mentioned above, MR paired 6a is configured to become 180 ° of angles relatively about the center of rotary head drum 3 with 6b.Therefore, MR 6a and 6b alternately carry out reproduction process with 180 ° of phase differential.That is to say that reproducing amplifier 55 alternately switches from MR 6a output with 180 ° phase differential and is reproduced the time of signal and is reproduced time of signal from MR 6b output.
Be supplied to the signal transmission ring 27c of rotor core 27 from the reproducing signal of reproducing amplifier 55.Under contactless mode, this reproducing signal is transferred to the signal transmission ring 26c of stator core 26.25 pairs of the rotary transformers low frequency component in must transmission signals is decayed, and carry high frequency component only.That is to say that rotary transformer 25 transmits this signal in contactless mode, and as Hi-pass filter.
Therefore, when being reproduced signal when the signal of rotor core 27 transmission ring 27c is transferred to the signal transmission ring 26c of stator core 26, the reproducing signal that is detected by MR 6a and 6b is formed the signal that does not contain low frequency component.This causes such a case,, if hot unevenness is included in the output from MR 6a and 6b, then removes hot unevenness when the signal transmission encircles 26c when reproducing signal is transferred to from signal transmission ring 27c that is.
Because the data of no DC sign indicating number chain form are recorded on the tape 7, so if rotary transformer 25 decay low frequency components just can prevent the leakage of data.
The reproducing signal that is transferred to stator core 26 signals transmission ring 26c is supplied to reproducing amplifier 56, so that amplify this signal by reproducing amplifier 56.Then, this reproducing signal is supplied to testing circuit 57.Testing circuit 57 is according to the data of the reproducing signal error detecting code chain form of supplying with reproducing amplifier 56.The data that are recorded on the tape 7 are the data that are converted to no DC sign indicating number chain.Therefore, the data that detected by testing circuit 57 are data of no DC sign indicating number chain form.
The data that detected by testing circuit 57 are supplied to demodulator circuit 58, so that these data of demodulation.If these data have been subjected to for example 8-10 position conversion of modulation circuit 42 when being recorded data, then demodulator circuit 58 carries out opposite conversion, and promptly the data that testing circuit 57 is detected are carried out the 10-8 conversion.If these data have been subjected to for example 8-9 conversion of modulation circuit 42 when being recorded data, then demodulator circuit 58 carries out opposite conversion, and promptly the data that testing circuit 57 is detected are carried out the 9-8 conversion.As mentioned above, demodulator circuit 58 plays a demodulating equipment, demodulating data under the state of this demodulating equipment be converted to no DC sign indicating number chain from reproducing signal before, and also the low frequency component of this reproducing signal has been played rotary transformer 25 decay of Hi-pass filter effect.
Be supplied to demoder 59 so that decoded by 58 demodulated data of demodulator circuit, output it to external circuit 40 then.The error correction code that is added in the data by scrambler 41 during according to record data, demoder 59 is carried out an error recovery procedure.That is to say that demoder 59 plays an error correction device, according to error correction code 58 demodulated data of demodulator circuit are carried out an error recovery procedure, this error recovery procedure is carried out according to this error correction code.
Carry out error recovery procedure as mentioned above.Therefore, if the snotter of introducing between MR 6a and 6b and the tape 7 causes the reproducing signal leakage, then can under the little situation of reproducing signal wastage, reappear raw data.
If constitute this circuit as shown in Figure 5, then paired induction magnetic head 5a and 5b, paired MR 6a and 6b, rectifier 53, pressure regulator 54 and reproducing amplifier 55 are fixed on the rotary head drum 3, so that they are with rotary head drum 3 rotations.On the other hand, scrambler 41, modulation circuit 42, record amplifier 43 and 44, oscillator 51, analog line driver 52, reproducing amplifier 56, testing circuit 57, demodulator circuit 58 and demoder 59 are set in the stationary part of rotary head drum unit 1, perhaps be produced in the external circuit, wherein external circuit and rotary head drum unit 1 constitute independently of one another.
The part of circuit shown in Figure 5 shown in Fig. 6, this part are arranged in a zone, and this zone is from being connected to the reproducing amplifier 55 of rotary transformer 25 rotating parts, up to the equipment side circuit that is connected to rotary transformer 25 stationary parts.
Symbol E
iBe output voltage from reproducing amplifier 55, R
1Be the output resistance of reproducing amplifier 55, L is the mutual inductance of rotary transformer 25, R
2Be the input resistance that is connected to the equipment side circuit of rotary transformer 25 stationary parts, E
0It is output voltage from rotary head drum unit 1.
Suppose must transmission signals frequency be f, then can represent the I/O characteristic of this equivalence circuit by following formula (1):
E
0/E
1＝(m
2+p
2)
-1/2 (1)
Wherein, m=(R
1+ R
2)/R
2, p=R
1/ (2 π fL)
Suppose that by gain (cutoff gain) be from peak value-3dB, then work as m=p
(f=f1)The time by following formula (2) expression I/O characteristic:
E
0(f＝f1)/E
0(f＝∞)＝-3dB＝2
-1/2 (2)
Since m=p, so the cutoff frequency f1 in the enough following formulas of energy (3) the expression low frequency range:
f
1＝(R
1R
2)/{2πL(R
1+R
2)} (3)
So, the cutoff frequency f in the low frequency range
1By R
1, L and R
2Determine.That is to say, be connected to the output resistance R of the reproducing amplifier 55 of MR 6a and 6b
1, the mutual inductance L of rotary transformer 25 and the input resistance R of equipment side circuit
2The cutoff frequency of decision Hi-pass filter.
Thus, adjust above-mentioned value,, when reproducing signal, produce this noise as tape and MR 6a with when 6b is in contact with one another so that the cutoff frequency of Hi-pass filter is not less than the frequency (hot unevenness) of noise in the low frequency range.
Specifically, if the relative velocity between MR 6a of supposition and 6b and the tape 7 is V[m/s], then the frequency range of hot unevenness is not higher than about 50 * 10
3[m
-1] * V[m/s].So, adjust R
1, R
2With the value of L, so that the cutoff frequency f of Hi-pass filter
1Satisfy following formula (4):
f
1[Hz]＞50×10
3[m
-1]×V[m/s] (4)
Thus, can remove noise (hot unevenness) in the low frequency range that is produced when tape and MR 6a and 6b are in contact with one another.Therefore, can access the limited signal of noise component.Be to be noted that the cutoff frequency f of Hi-pass filter
1Can accomplish and not be higher than the low-limit frequency that must be recorded in signal frequency range on the tape.Thus, can prevent the desired signal unnecessary attenuation.
In example shown in Figure 5, rotary transformer 25 is used as Hi-pass filter.But, also a Hi-pass filter can be set separately outside rotary transformer 25.In these cases, Hi-pass filter can be arranged on one from MR 6a and 6b to the district of demodulator circuit 58.And in these cases, can from reproducing signal, remove hot unevenness, this is similar to the structure of rotary transformer 25 as Hi-pass filter.
Shown in Fig. 7 and 8, MR 6 comprises: paired magnetic cup 61 and 62, and they are made by resembling nickel-such soft magnetic material of zinc polycrystalline ferrite; One MR device portions 64, it is supported by an insulator 63 by paired magnetic cup 61 and 62; Permanent magnet film 65a and 65b, they are arranged on the both sides of MR device portions 64; And conductor part 66a and 66b, they are connected to permanent magnet film 65a and 65b.As shown in Figure 8, MR device portions 64 is configured to become a predetermined party parallactic angle θ with MR the 6 glide direction D with respect to tape 7.Be to be noted that and omitted insulator 63 among Fig. 7.Fig. 8 represents MR device portions 64 and peripheral part thereof.
Usually the gap between magnetic cup 61 and the magnetic cup 62 is called " reproduction gap ".Preferably, determine to reappear the width t in gap
1So that it is applicable to the signal wavelength that is recorded on the tape 7.Specifically, above-mentioned width is about 0.1 μ m～0.2 μ m, to improve desired in recent years recording density.
By lamination one have MR device, a SAL (soft adjoining course) of magnetoresistance and place the MR device and the SAL rete between a dielectric film, just form the MR device portions 64 of MR 6.
The MR device is made by a kind of soft magnetic material, for example has the Ni-Fe that is changed resistance by external magnetic field strength.Preferably, the thickness of MR device is about 20nm～60nm.The magnetic saturation of the MR device of being made by Ni-Fe is about 600emu/cm
3～1000emu/cm
3The SAL rete imposes on the MR device by a kind of usually said SAL magnetic bias method with a vertical off setting magnetic field.The MR device is made by the magnetic material such as permalloy, and this material has bigger coercive force and higher magnetic permeability.Dielectric film makes MR device and SAL layer mutually insulated, to prevent to shunt loss (electrical shunt current loss).Dielectric film is made by the insulating material such as tantalum.
The permanent magnet film 65a and the 65b that are arranged on MR device portions 64 both sides impose on the MR device with a Horizontal offset magnetic field. Permanent magnet film 65a and 65b are configured to contact with the both side surface of MR device.Like this, just, form a usually said connected structure (abut structure). Permanent magnet film 65a and 65b are made by the magnetic material such as cobalt-nickel-platinum or cobalt-chromium-platinum, and it has bigger coercive force and magnetic permeability.
On the both side surface of magnetic cup 62, form conductor part 66a and the 66b be connected to permanent magnet film 65a and 65b, so that outside the end of conductor part 66a and 66b is exposed to.The end of conductor part 66a and 66b is made into terminal 67a and 67b, and these two terminal 67a and 67b provide the detection electric current from the outside to the MR device.That is to say, from terminal 67a and 67b, through conductor part 66a and 66b and permanent magnet film 65a and 65b, be the MR device that MR device portions 64 is provided with detecting current supply.
The MR device portions 64 of MR 6 is essentially planar rectangular.The minor axis of MR device portions 64 is made into and is substantially perpendicular to tape slidingsurface 68.In addition, MR device portions 64 is supported through insulator 63 by paired magnetic cup 61 and 62, thereby is made any side surface of MR device portions 64 be exposed to tape slidingsurface 68.
When MR head during with tape 7 relative slips, tape 7 is mainly supported by rotary head drum 3 and the air-flow that produces because of the rotation of rotary head drum 3.The MR 6 that contains MR device portions 64 and peripheral part thereof is made into tape 7 contacts and relative its and slides (wherein MR device portions 64 and peripheral part thereof reach on the outside surface of rotary head drum 3), thereby makes tape 7 formation one tent shapes (tent shape).As mentioned above, the tape slidingsurface 68 of MR 6 has been worn into cylindrical, makes the overhang maximum of MR device portions 64 and peripheral part thereof.In addition, MR 6 is fixed on the rotary head drum 3, so that worn on the outside surface that columniform part reaches rotary head drum 3.So, can improve the contact performance between MR device portions 64 and the tape 7.
When making above-mentioned MR 6 work with playing data for broadcasting from tape 7, as shown in Figure 9, tape 7 slides on MR device portions 64.Fig. 9 is a synoptic diagram that amplifies; the MR device portions 64 of expression tape 7 and MR 6; wherein with the guard bandless recording method data are recorded on the tape 7, and MR device portions 64 and the peripheral part thereof of MR 6 slide on tape 7 with a predetermined party parallactic angle θ.Fig. 9 schematically shows a state by MR 6 reconstruction processes of carrying out.Arrow D indication MR 6 direction of on tape 7, sliding shown in Figure 9.
When playing data for broadcasting from tape 7, at tape 7 just under the state that slides on the MR device portions 64, one detects electric current supplies with the MR device that is provided with for MR device portions 64 by permanent magnet film 65a and 65b, and wherein permanent magnet film 65a and 65b are connected to the two ends of MR device portions 64 and conductor part 66a and 66b.
Specifically, be connected to pressure regulator 54 for the set terminal 67a in the end of conductor part 66a.Then, apply a predetermined voltage, so that the detection electric current is provided from pressure regulator 54.In addition, the terminal 67b that is provided with for the end of conductor part 66b is connected to rotary head drum 3.Rotary head drum 3 is electrically connected on the static magnetic drum 2 through turning axle 21.In addition, static magnetic drum 2 ground connection.So the terminal 67b that is provided with for conductor part 66b passes through rotary head drum 3, turning axle 21 and static magnetic drum 2 ground connection.
In the time will detecting current supply MR device portions 64 under the state that is sliding at tape 7, the resistance of the set MR device of MR device portions 64 is changed in the magnetic field that is produced according to tape 7.The voltage that detects electric current is changed.When the change in voltage that detects electric current was detected, the magnetic field of the signal that tape 7 produces was detected.Therefore, the data that are recorded on the tape 7 are reproduced.
The MR device that is used for MR 6 can be a kind of device with magnetoresistance.For example, can adopt a kind of usually said giant magnetoresistance effect (giant magnetoresistanceeffect) device (GMR device), wherein make this device by a plurality of films of lamination to reach higher magnetoresistance.The method that bias magnetic field is imposed on the MR device is not limited to SAL magnetic bias method.For example, can adopt any one method in the following the whole bag of tricks, it comprises: permanent magnet offsetting, shunt bias method, automatic biasing method, exchange offsetting, scalable pole (barber pole) method, separation device (division device) method or servo-offset method.As for giant magnetoresistance effect and various biasing means, referring to " the BASE AND APPLICATION OFMAGNETORESISTANCE EFFECT HEAD " of Maruzen publication, KazuhikoHayashi translations.
When reappearing the data that are recorded on the tape 7 by MR 6, if the width t of MR 6 Magnetic Sensors part
2(hereinafter be called " record-header width t
2") less than the track width t of magnetic track record
3, then the output that reappears reduces.If record-header width t
2Total track width t greater than two adjacent magnetic track records
4, then can excessively produce and crosstalk.Therefore, as shown in Figure 9, preferably, record-header width t
2The big track width t that records the magnetic track record of data thereon by the guard bandless recording method by induction magnetic head 5a and 5b
3In addition, preferably, record-header width t
2Overall width t less than two adjacent magnetic track records
4Reappear head width t when setting as mentioned above
2The time, can access one and limit the big reproduction output quantity of crosstalking.
Use description to the tape 7 in the recording equipment now, this equipment comprises above-mentioned rotary head drum unit 1.
Preferably, magnetospheric coercive force is 1000 oersteds～2000 oersteds, and squareness ratio is 0.6～0.9, and remanent magnetism is 200emu/cm
3～300emu/cm
3As the magnetosphere that satisfies above-mentioned characteristic, the metal magnetic layer that preferably adopts a kind of metallicl magnetic material to make.
Specifically, preferably adopt evaporation method, spraying plating (sputtering) method or ion diffusion coating method on non magnetic support member, to form a feeromagnetic metal magnetic material, for example cobalt, cobalt-oxygen, cobalt-chromium, cobalt-nickel, cobalt-iron-nickel or cobalt-nickel-chromium.Be to be noted that magnetospheric characteristic depends on this material and formation method.That is to say,, can control remanent magnetism, squareness ratio or the like when with evaporation method with the amount of oxygen of being introduced during changing evaporation process when forming magnetosphere.
An existing trend is even reproduction output quantity and magnetospheric thickness amplify pro rata.Be to be noted that above-mentioned effect can improve, up to thickness be about recording wavelength 1/4 till.Under the situation of thickness,, then can't enlarge markedly the reproduction output quantity if strengthen thickness greater than recording wavelength 1/4.If magnetosphere is too thick, then may cause the problem that quantum of output reduces.So preferred magnetospheric thickness is about 20nm～200nm.
Can be by a monofilm, form this magnetic film by the multilayer film that obtains by the laminated multilayer film or by the composite membrane that the multilayer film of making by the lamination different materials obtain.
When forming diaphragm on magnetosphere, this diaphragm can be a kind of carbon type film, for example a rhombus carbon film or by CrO
2, AL
2O
3, BN, Co oxide, MgO, SiO
2, Si
3O
4, SiN
x, SiC, SiN
x-SiO
2, ZrO
2, TiO
2Or the film made of TiC.From improving the viewpoint of sliding properties between MR 6 and the tape 7, preferably this diaphragm adopts a kind of rhombus shape carbon film (usually said DLC film).This diaphragm can be the composite membrane that a monofilm, a kind of multilayer film of making by the laminated multilayer film or a kind of multilayer film of making by the lamination different materials are made.
At last, output to available reproducing signal is described now when above-mentioned MR 6 is used to carry out the spiral scan method.Its instantiation is shown in Figure 10 to 12.Be to be noted that MR 6 comprises the MR device that Ni-Fe is made.The width t of record gap
1Be 0.17 μ m, record-header width t
2Be 18 μ m, the track width t of magnetic track record
3Be 11 μ m, azimuth angle theta is ± 25 °, and the relative velocity V between MR 6 and the tape 7 is 10m/s.
From MR 6 reproducing signals that obtain, Figure 10 represented by this signal under the state before the Hi-pass filter when Figure 10 represented not have data to be recorded on the tape 7.As shown in figure 10, this reproducing signal has variation more significantly at low frequency range.These variations are mainly caused by hot unevenness.
From MR 6 reproducing signals that obtain, Figure 10 illustrated this signal by this signal under the state before the Hi-pass filter when Figure 11 represented that data with existing is recorded on the tape 7.Figure 12 represents by the reproducing signal after the Hi-pass filter.The cutoff frequency that is to be noted that Hi-pass filter is 500kHz.
As shown in figure 11, the noise component that comprises lower frequency by the reproducing signal before the Hi-pass filter.The above-mentioned fact is mainly caused by hot unevenness.When reproducing signal passed through Hi-pass filter, hot unevenness was removed from this reproducing signal.Like this, as shown in figure 12, can access the wherein gratifying reproducing signal of noise limited.
Preferably make the cutoff frequency of Hi-pass filter be about the highest frequency of hot unevenness.Be to be noted that this cutoff frequency must not be higher than the low-limit frequency of tracer signal frequency range.Specifically, usually preferably the cutoff frequency of Hi-pass filter is about 500kHz～1000kHz, but must wait to determine it according to the relative velocity between MR 6 and the tape 7.
Industrial applicibility
As mentioned above, can access a stable weight according to magnetic recording/producing device of the present invention Now output, this is because can remove hot unevenness from reproducing signal. So, according to this Bright, can be used as write head to the MR head that can access high sensitivity and big reproducing signal, It is fixed on helical scan type magnetic recording/reproducing apparatus. Thus, can further increase note Record density, and further capacity increasing.
Claims (3)
1. helical scan type magnetic recording/reproducing apparatus comprises:
One magnetoresistance effect head, it is fixed on the rotary head drum, and is set to the reproducing signal that can detect from a tape, has recorded on this tape and has been converted to the data that need not DC sign indicating number chain;
One Hi-pass filter, its low frequency component in the detected reproducing signal of described magnetoresistance effect head that is used for decaying;
Demodulating equipment, it is used for being converted under the state before need not DC sign indicating number chain demodulating data from reproducing signal in data, and the low frequency component of this reproducing signal is by described Hi-pass filter decay; And
One write head, it is fixed on the described rotary head drum, and is configured to the data of described modulating device modulation are recorded on the tape;
Wherein paired magnetoresistance effect head is set to described magnetoresistance effect head, and all sets a predetermined position angle in this paired magnetoresistance effect head each;
Paired write head is set to described write head, and all sets a predetermined position angle in this paired write head each;
When being recorded in data on the tape, described paired write head carries out guard bandless recording when data being recorded on this tape;
When playing data for broadcasting from this tape, described paired magnetoresistance effect head reappears by described paired write head by the guard bandless recording recorded data; And
The width of the Magnetic Sensor of described magnetoresistance tape part, greater than by the track width of described write head by the magnetic track record that guard bandless recording write down, and less than total track width of two adjacent magnetic track records.
2. helical scan type magnetic recording/reproducing apparatus comprises:
One magnetoresistance effect head, it is fixed on the rotary head drum, and is set to the reproducing signal that can detect from a tape, has recorded on this tape and has been converted to the data that need not DC sign indicating number chain;
One Hi-pass filter, its low frequency component in the detected reproducing signal of described magnetoresistance effect head that is used for decaying; And
Demodulating equipment, it is used for being converted under the state before need not DC sign indicating number chain demodulating data from reproducing signal in data, and the low frequency component of this reproducing signal is by described Hi-pass filter decay;
Wherein, described magnetoresistance effect head comprises a Magnetic Sensor device, and this device detects a magnetic field from tape, and this device supported by paired magnetic cup, and
Wherein, paired magnetoresistance effect head is set to described magnetoresistance effect head, and all sets a predetermined position angle in this paired magnetoresistance effect head each,
Paired write head is set to described write head, and all sets a predetermined position angle in this paired write head each,
When being recorded in data on the tape, described paired write head carries out guard bandless recording when data being recorded on this tape, and
When playing data for broadcasting from this tape, described paired magnetoresistance effect head reappears by described paired write head by the guard bandless recording recorded data.
3. helical scan type magnetic recording/reproducing apparatus comprises:
One magnetoresistance effect head, it is fixed on the rotary head drum, and is set to the reproducing signal that can detect from a tape, has recorded on this tape and has been converted to the data that need not DC sign indicating number chain;
One Hi-pass filter, its low frequency component in the detected reproducing signal of described magnetoresistance effect head that is used for decaying; And
Demodulating equipment, it is used for being converted under the state before need not DC sign indicating number chain demodulating data from reproducing signal in data, and the low frequency component of this reproducing signal is by described Hi-pass filter decay;
Wherein, described magnetoresistance effect head comprises a Magnetic Sensor device and a permanent magnet, and this device detects the magnetic field from tape, and this device is one to have the magneto-resistance effect device of magnetoresistance, described permanent magnet is arranged on the both sides of described magneto-resistance effect device, and
Wherein, paired magnetoresistance effect head is set to described magnetoresistance effect head, and all sets a predetermined position angle in this paired magnetoresistance effect head each,
Paired write head is set to described write head, and all sets a predetermined position angle in this paired write head each,
When being recorded in data on the tape, described paired write head carries out guard bandless recording when data being recorded on this tape, and
When playing data for broadcasting from this tape, described paired magnetoresistance effect head reappears by described paired write head by the guard bandless recording recorded data.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27455797 | 1997-10-07 | ||
| JP274557/97 | 1997-10-07 | ||
| JP001135/98 | 1998-01-06 |
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| Publication Number | Publication Date |
|---|---|
| CN1243588A CN1243588A (en) | 2000-02-02 |
| CN1295679C true CN1295679C (en) | 2007-01-17 |
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|---|---|---|---|
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|---|---|
| CN (1) | CN1295679C (en) |
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|---|---|---|---|---|
| JP4348741B2 (en) * | 2005-06-27 | 2009-10-21 | 日本電気株式会社 | Optical information recording medium and optical information reproducing apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08306015A (en) * | 1995-05-01 | 1996-11-22 | Kao Corp | Rotary head type magnetic recording/reproducing device |
| JPH09251606A (en) * | 1996-03-18 | 1997-09-22 | Toshiba Corp | Data recording and reproducing device and read signal processing method in the same device |
-
1998
- 1998-10-07 CN CNB988017091A patent/CN1295679C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08306015A (en) * | 1995-05-01 | 1996-11-22 | Kao Corp | Rotary head type magnetic recording/reproducing device |
| JPH09251606A (en) * | 1996-03-18 | 1997-09-22 | Toshiba Corp | Data recording and reproducing device and read signal processing method in the same device |
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|---|---|
| CN1243588A (en) | 2000-02-02 |
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