JP2002074629A - Method and apparatus for controlling rotary head position - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic recording/reproducing device in which the problem of wear is solved when MR heads 31A and 31B are used as rotary magnetic heads for reproduction. SOLUTION: A signal is recorded from a magnetic tape 29 wound around a rotary head drum 60 by using recording inductive magnetic heads 32A and 32B, the signal is reproduced from the magnetic tape 29 wound around the rotary head drum by using reproducing MR heads 31A and 31B, and only when the signal is reproduced from the magnetic tape 29 wound around the rotary head drum 60 by using the reproducing MR rotary heads 31A and 31B, the MR rotary heads 31A and 31B are controlled to be positioned so as to be abutted on the magnetic tape 29, and thus the unnecessary wear of the MR rotary heads 31A and 31B is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position where a signal can be recorded on a magnetic tape wound around a predetermined position of a rotary head device, a position where a signal recorded on the magnetic tape can be reproduced, and a position where the signal can be reproduced. TECHNICAL FIELD The present invention relates to a rotary head mounting position control method for setting a magnetic head at a position distant from a magnetic head, and a rotary head mounting position control device to which the rotary head mounting position control method is applied.

[0002]

2. Description of the Related Art In recent years, there has been a tendency to reduce the gap depth of an operating gap of a magnetic head in order to increase the recording density when magnetically recording and reproducing signals on a magnetic recording medium. In particular, the magnetoresistance effect (magnetoresistance
effect) is a magnetoresistive effect type magnetic head (hereinafter referred to as an MR type head) constituted by using a member as a magneto-electric signal conversion member, by winding a signal line around a ring-shaped magnetic core having an operating gap. This has the advantage of having higher read sensitivity when reading information recorded on a magnetic recording medium as compared with a magnetic head configured as described above (hereinafter referred to as an inductive head). Suitable for playing recorded signals.

However, even with this MR type head, in order to obtain high reproduction sensitivity in reproducing a signal recorded at a high density, it is necessary to sufficiently reduce the MR height corresponding to the gap depth of the induction type head. .
For example, in the case of an MR head having a reproduction gap width of about 10 microns, the MR height needs to be 3 microns or less.

By the way, in a hard disk drive, an MR type head is frequently used, and the MR head in this hard disk device is used in a so-called floating head utilizing an air flow generated on the surface of a high-speed rotating disk. Is used in a state in which a minute gap is maintained between the disk and the MR type head, that is, in a state in which it does not contact the hard disk. Therefore, even if the MR height is 3 microns or less, there is no particular problem of head wear.

[0005]

However, when such an MR type head is mounted on a rotary head device and used as a reproducing head, the magnetic tape and the MR type head are kept in a non-contact state and the magnetic tape is used. It is practically impossible to reproduce the signal, and the MR type head must be used in a state of sliding contact with the magnetic tape. However, when the MR type head is constantly used in a state of being in sliding contact with the magnetic tape, a problem arises in that the sliding surface of the MR type head is quickly worn.

As a result of such wear, M
The output level and waveform characteristics of the signal reproduced from the R-type head change, which has a significant effect on the S / N of the reproduced signal. Further, in order to obtain a high reproduction sensitivity in reproducing a signal recorded at a high density, the life of the MR type head, in which the MR height corresponding to the gap depth of the induction type head is reduced to about 10 microns, is remarkably increased. There is a problem of shortening.

The present invention has been made in view of such a conventional problem, and when an MR type head is mounted on a rotary head device and used as a reproducing head, it is necessary to use the MR type head as a reproducing head. During the period in which no signal is recorded on the magnetic tape as an example, the MR head is kept in a non-contact state with the magnetic tape or in a weaker contact pressure state than in the reproduction state. It aims to solve the problems that have been solved.

[0008]

Means for Solving the Problems In order to solve the above-mentioned problems and the like, and to achieve the above-mentioned object, a first aspect of the present invention is described.
In the method for controlling the position of a rotary head, a signal is recorded by a rotary head for recording on a magnetic tape wound around a predetermined range of a rotary head drum having a rotary head for recording and a rotary head for reproduction. A method for controlling a mounting position of a rotary head with respect to a rotary magnetic head drum, wherein a signal recorded on the magnetic tape is reproduced from the magnetic tape by the reproducing rotary head;
The reproducing rotary head can be moved between a position where the rotary head is brought into contact with a magnetic tape wound around a predetermined range of the rotary head drum and a position separated from the magnetic tape, When recording a signal on the magnetic tape wound around a predetermined area of the rotating magnetic head drum by a recording rotating head, the reproducing rotating head was wound around a predetermined area of the rotating head drum. When a signal is reproduced from a magnetic tape wound around a predetermined range of the rotating magnetic head drum by a reproducing rotating head, the reproducing rotary head is rotated. The head drum is controlled so as to be brought into contact with a magnetic tape wound around a predetermined area of the head drum. By performing the position control of the rotary head in this way, in the rotary head position control method according to the first aspect of the present invention, useless wear of the reproducing rotary head can be avoided.

In the method of controlling the position of a rotary head according to a third aspect of the present invention, a magnetic tape wound around a predetermined area of a rotary head drum having a rotary head for recording and a rotary head for reproduction is provided. A signal is recorded by a recording rotary head, and a signal recorded on the magnetic tape is reproduced from the magnetic tape by the reproducing rotary head. Thus, the recording rotary head can be moved between a position where the recording rotary head is in contact with the magnetic tape wound around a predetermined area of the rotary head drum and a position separated from the magnetic tape. And the position at which the rotary head for reproduction is brought into contact with the magnetic tape wound around a predetermined area of the rotary head drum. When a signal is recorded by the recording rotary head with respect to the magnetic tape wound around a predetermined area of the rotary magnetic head drum so that the magnetic tape can be moved between a position separated from the magnetic tape and the recording head. The recording rotary head is brought into contact with the magnetic tape wound around a predetermined area of the rotary head drum, and the reproducing rotary head is positioned within a predetermined area of the rotary head drum. When a signal is reproduced by a reproducing rotary head from a magnetic tape wound around a predetermined range of the rotating magnetic head drum, the signal is controlled so as to be at a position separated from the wound magnetic tape. The rotating head is positioned at a position where the rotating head is brought into contact with the magnetic tape wound around a predetermined area of the rotating head drum. The rotary head is controlled to be at a position separated from the magnetic tape wound around a predetermined area of the rotary head drum, and signals are recorded from the magnetic tape by the rotary head for recording and reproduced from the magnetic tape. When the signal is not reproduced by the rotary head for recording, the rotary head for recording and the rotary head for reproduction are controlled to be separated from the magnetic tape. By performing the position control of the rotary head in this way, in the rotary head position control method according to the third aspect of the present invention, it is possible to avoid unnecessary wear of the rotary head for recording and the rotary head for reproduction. .

In the method of controlling the position of a rotary head according to a fifth aspect of the present invention, a magnetic tape wound around a predetermined area of a rotary head drum having a rotary head for recording and a rotary head for reproduction is provided. A signal is recorded by a recording rotary head, and a signal recorded on the magnetic tape is reproduced from the magnetic tape by the reproducing rotary head. The position at which the recording rotary head is brought into contact with the magnetic tape wound around a predetermined area of the rotary head drum with a predetermined contact pressure, and the position at which the predetermined contact pressure is applied to the magnetic tape. The head can be moved between the contact position with a weak contact pressure and the rotating head for reproduction is rotated by a rotating head drum. A position brought into contact with a predetermined contact pressure against the wound magnetic tape to a predetermined range,
The magnetic tape can be moved between a position where the magnetic tape is in contact with the magnetic tape with a contact pressure weaker than a predetermined contact pressure, and the magnetic tape wound around a predetermined range of the rotary magnetic head drum is moved. When a signal is recorded by the recording rotary head, the recording rotary head is brought into contact with the magnetic tape wound around a predetermined range of the rotary head drum with a predetermined contact pressure, and The rotating magnetic head for reproduction is controlled so as to be in a position where it contacts the magnetic tape wound around a predetermined area of the rotating head drum with a contact pressure weaker than a predetermined contact pressure. When a signal is reproduced from the magnetic tape wound around the area by the rotary head for reproduction, the rotary head for reproduction is connected to the rotary head drum. At a position where the magnetic tape wound around a predetermined area is brought into contact with a predetermined contact pressure with a predetermined contact pressure, the recording rotary head is moved with respect to the magnetic tape wound around a predetermined area of the rotary head drum. Control the contact position with a contact pressure that is weaker than the predetermined contact pressure so that the signal is recorded on the magnetic tape by the recording rotary head and the signal is reproduced from the magnetic tape by the reproduction rotary head. At times other than reproduction, the recording rotary head and the reproducing rotary head can be brought into contact with the magnetic tape with a contact pressure weaker than the predetermined contact pressure. It is characterized by being controlled. By performing the position control of the rotary head in this manner, in the rotary head position control method according to claim 5 of the present invention, each of the rotary head for recording and the rotary head for reproduction is not separated from the magnetic tape. Unnecessary wear can be avoided.

In the rotary head position control device according to the present invention, the magnetic tape wound around a predetermined area of a rotary head drum having a rotary head for recording and a rotary head for reproduction is provided. A rotary head mounting position control device for a rotary magnetic head drum, in which a signal is recorded by a recording rotary head and a signal recorded on the magnetic tape is reproduced from the magnetic tape by the reproducing rotary head. Thus, the rotary head for reproduction can be moved between a position where the rotary head is brought into contact with the magnetic tape wound around a predetermined area of the rotary head drum and a position separated from the magnetic tape. When a signal is recorded on a magnetic tape wound around a predetermined area of the rotating magnetic head drum by a recording rotating head. In this method, the rotating head for reproduction is controlled to be at a position separated from the magnetic tape wound around a predetermined area of the rotating head drum, and the magnetic head wound around a predetermined area of the rotating magnetic head drum is controlled. When a signal is reproduced from the tape by the reproducing rotary head, the control is performed such that the reproducing rotary head is brought into contact with the magnetic tape wound around a predetermined range of the rotary head drum. It is characterized by. By performing the position control of the rotary head in this way, in the rotary head position control device according to claim 7 of the present invention, it is possible to avoid unnecessary wear of the rotary head for reproduction.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary head position control method according to the present invention and a preferred rotary head position control apparatus to which the rotary head position control method is applied will be described with reference to the drawings. .

FIGS. 1 to 7 show an embodiment of the present invention. FIGS. 1 to 7 show a case where a magnetic tape cassette is used as a recording medium which is a specific example of a magnetic recording / reproducing apparatus. An example in which a rotary head position control device of the present invention is applied to a rotary head type digital video tape recorder (hereinafter referred to as a cassette type VTR). As another specific example of the magnetic recording / reproducing apparatus, a digital audio tape recorder (DA)
T), a magnetic recording / reproducing apparatus capable of magnetically recording or reproducing various information such as a data recorder on a tape medium of various forms.

FIG. 2 is a block diagram showing a main part of a magnetic recording / reproducing apparatus according to the present invention, and FIG. 2 is a block diagram showing an example of a main part of a signal processing apparatus according to the present invention. The signal processing device 1 includes a recording / reproducing circuit unit 2, a memory interface 3, a tape head drive control unit 4, a system control circuit unit 5, a display unit 6, and an operation unit 7.

Next, an example of a tape cassette applicable to the present invention will be described with reference to FIGS. FIG. 3A is a bird's-eye view of the tape cassette, and FIG. 3B is a cross-sectional view showing a portion of the tape cassette cut at a position indicated by a cutting line AA in FIG. 3A.

In FIG. 3A, reference numeral 20 denotes a tape cassette;
Reference numeral 1 denotes the cassette case, and the cassette case 21 has a rectangular shape that is long on the left and right as viewed in a plane, and has a flat box shape with a small vertical width. And this cassette case 21
Inside, a magnetic tape supply reel (hereinafter referred to as a supply reel) 28A and a magnetic tape take-up reel (hereinafter referred to as a take-up reel) 28B are rotatable as shown in FIG. It is stored in. A part of the magnetic tape 29 wound around the supply reel 28A and the take-up reel 28B is led out of the cassette case 21 from outlet windows 26A and 26B of the tape formed on the front surface 21e of the cassette case 21, and FIG. Are located along the front surface at the position shown by the dashed line.

A front lid 22 is supported at the front end of the cassette case 21 so as to be vertically rotatable.
d), the front lid 22 opens and closes the front surface 21e of the magnetic tape 29 located along the front surface of the cassette case 21. 21a is the rear surface of the cassette case 21, 21b is its upper surface, 21c
Is its lower surface and 21d is its side surface. In FIG. 2, the upper surface 21A of the cassette case 21 is omitted to explain the internal configuration of the cassette case 21.

On the rear surface 21a, electrical information detecting terminals 23a, 23b, 23c and 23d are arranged in an exposed state. That is, these electrical information detecting terminals 2
Each of 3a, 23b, 23c and 23d is formed on a printed circuit board 24. As shown in FIG. 3B, the printed circuit board 24 has electrical information in a shallow recess 25 formed on the inner surface of the rear wall 21a of the cassette case 22. Detection terminal 23
a, 23b, 23c, and 23d are fitted and fixed in the rearward direction, and these electrical information detecting terminals 23a, 23b, and 2d pass through a window 26 formed in a shallow recess 25.
3c and 23d are exposed.
The printed circuit board 24 is mounted with an electrically erasable and rewritable ROM (hereinafter, referred to as an EEPROM) 27, and includes terminals 23a for detecting electrical information,
23b, 23c and 23d are configured as data signal input / output terminals of the EEPROM 27,
1 through these terminals from outside the EEPROM 27.
And data can be read from and read from the memory.

Next, an example of a magnetic head device applicable to the present invention will be described with reference to FIGS. 4A and 4B. FIG. 4A
FIG. 4B is an exploded perspective view showing a main part of an induction type head part constituting a recording head of the magnetic head device. FIG. 4B is a perspective view showing a main part of an MR type head part constituting a reproducing head of the magnetic head device. It is the exploded perspective view shown.

In FIG. 4, reference numeral 30 denotes a magnetic head device. The magnetic head device 30 comprises an MR head unit 31 and an inductive head unit 32. The MR head unit 31 constitutes a read-only head, The unit 32 constitutes a recording-only head. This MR type head portion 31 is formed of the MR film layer 3.
9, first magnetic domain control film layer 40A, second magnetic domain control film layer 4
0B, the shunt film layer 41, the first electrode layer 42A and the second
Is formed. The inductive head section 32 includes a first magnetic core layer 33, a second magnetic core layer 34, and a signal recording coil 35.
36 is a head substrate part, and 37 is a shield layer.

Then, as shown in FIG. 4B, an MR film layer 39, a first magnetic domain control film layer 40A, a second magnetic domain control film layer 40B, a shunt film layer 41, a first electrode layer The MR head section 31 is formed by sequentially attaching and integrating each of the second electrode layer 42A and the second electrode layer 42B. Then, on the head substrate portion 36, the shield layer 37, the first magnetic core layer 33, the signal reading coil 35, and the second magnetic core layer 3
4A are adhered and integrated in the order shown in FIG. 4A to form the inductive head portion 32.

At the time of this attachment and integration, a nonmagnetic layer 33C having a predetermined thickness is formed on the inner surface 33B side of the tip portion 33A of the first magnetic core layer 33. The leading end 33A and the leading end 34A of the second magnetic core layer 34 are integrated via the nonmagnetic layer 33C, and a signal recording area is provided between the leading end 33A and the leading end 34A of the second magnetic core layer. Is formed. Therefore, FIG.
The recording gap width indicated by 43 in A is the width of the recording track recorded on the magnetic recording medium by the induction type head unit 32. The width indicated by 44 in FIG.
1 is the reproduction width of this recording track.

Still referring to FIG.
Reference numeral 5 denotes a part of the coil wound a plurality of times around the joint between the first magnetic core layer 33 and the second magnetic core layer 34 formed on the opposite side from the working gap.

Next, an example of a magnetic tape loading apparatus applicable to the present invention will be described with reference to FIG. .

In FIG. 2, reference numeral 50 is a plan view showing the structure of the main part of the magnetic tape loading device. The magnetic tape loading device 50 has two drawer guides 51A.
And a first tape pull-out guide 51, a second tape pull-out guide 52, a tape pull-out ring 53, and a third tape pull-out guide 54 provided on the tape pull-out ring 53. It is configured.

Next, the magnetic tape loading device 50
The magnetic tape loading operation will be described.

In the unloading state where the magnetic tape 29 is at the position shown by the dashed line in FIG. 2, the first tape pull-out guide 51 having two pull-out guides 51A and 51B is shown in FIG. At the position indicated by point A, the second
The tape pull-out guide 52 of FIG. 2 stands by at the position indicated by the point B in FIG. 2, and the third tape pull-out guide 54 is positioned at the position indicated by the point C in FIG. It is in a waiting state.

When the standby state is shifted to the tape loading state, the loading ring 53 is rotated counterclockwise by the drive shaft 55. The pull-out guide 5 constituting the first tape pull-out guide 51 according to the rotation of the loading ring 53
Each of 1A and 51B is moved to the position shown by the point D in FIG. 2 while pulling out the magnetic tape 29, and the third tape pull-out guide 54 is drawn out by the point E in FIG. Moved to the position where the

Then, in accordance with the tape withdrawn state,
With the rotation of the loading ring 53, the third tape pull-out guide 54 is rotated counterclockwise, and the magnetic tape 29 is pulled out to the position indicated by the point F in FIG. A tape loading state in which the magnetic tape 29 is wound over a predetermined range is established. 55A and 55B are planted at predetermined positions on the loading ring 53, and the portion of the magnetic tape 29 which is turned by the third tape pull-out guide 54 and returned to the take-up reel 28B side is transferred to the second tape pull-out guide 52. The tape guide shafts 56 for guiding the magnetic tape 2 are located within a predetermined range of the rotating magnetic head drum 60.
9 is a position regulating fixed guide shaft provided to regulate the wound state, 57 is an auxiliary fixed guide shaft, 58 is a capstan device, and 59 is rotatably supported and mounted on a loading ring 53. Is a pinch roller.

Next, the signal processing apparatus 1 described with reference to FIG.
Will be described.

First, the operation at the time of recording will be described.

When the operation section 7 is operated in the recording state, information indicating that the operation section 7 has been operated in the recording state is supplied to the system control circuit section 5 as the operation information signal Sck. The generated recording switching signal Se is supplied to the recording / reproducing circuit unit 2, and the recording / reproducing circuit unit 2 is switched to the recording state, and the recording signal S
r is the induction type head units 32A and 32 of the magnetic head device 30
2B.

As described above, the recording signal Sr is supplied to the inductive heads 32A and 32B, and the recording drive signal Sd is generated via the system control circuit 5 based on the recording switching signal Se. Sd is supplied to the tape head drive control unit 4, and a rotary head drum drive signal Sf and a capstan drive signal Sg are generated based on the recording drive signal Sd and a synchronization signal generated from the recording signal.

The rotary head drum drive signal Sf
The rotary head drum 60 is driven on the basis of the capstan driving signal Sg.
Is driven, and the guide tape units 32A and 32B record a predetermined recording signal on the magnetic tape 29 which is pressed against the capstan device 58 by the pinch roller 59 and transferred at a predetermined speed. Take-up reel 2
The drive unit 8B (not shown) is driven and controlled by the tape / head drive control unit 4, and is wound up on the take-up reel with a predetermined tape tension applied to the magnetic tape 29. Further, a signal serving as a reference for rotating head tracking at the time of reproduction is generated by the system control circuit unit 5,
It is recorded on a predetermined portion of the magnetic tape 29.

On the other hand, information such as recording time data at the time of recording and service data required when reproducing the magnetic tape 29 is written to the EEPROM 27 via the memory interface 3. Then, when the recording state is completed and the operation unit 7 is operated to rewind, the magnetic tape 29 is in a state of being rewound to the supply reel 28A.

In this state, when the operation section 7 is operated to the reproduction state, the capstan device 58 is driven by the capstan drive signal Sg supplied from the head / tape drive control section 4 in the tape loading state, and the pinch roller is driven. In a state where the magnetic tape 29 pressed by the capstan device 58 by the capstan device 58 is transported at a predetermined speed, the rotating magnetic drum 29 is driven by a rotating head drum driving signal Sf generated based on a signal serving as a reference for the reproduced rotating head tracking. In the reproduction tracking servo state in which the head drum 60 is driven, the reproduction signal Sp reproduced from the recording track of the magnetic tape 29 by the MR heads 31A and 31B is input to the recording / reproduction circuit 2.

The information such as the service data written in the EEPROM 27 is read out via the memory interface 3, converted into a displayable signal form via the system control circuit section 5, and supplied to the display section 6. Is displayed.

It should be noted that these inductive head portions 32A and 32
4B has the same configuration as the inductive head unit 32 shown and described as an example in FIG.
Each of A and 31B has the same configuration as the MR type head unit 31 shown and described as an example in FIG. 4B.

Next, an example of the recording / reproducing circuit unit 2 will be described with reference to FIG. FIG. 5 shows an example in which a video signal is recorded and reproduced. In FIG. 5, reference numeral 61 denotes a block diagram showing a circuit configuration of a video signal recording system, and reference numeral 68 denotes reproduction of a recorded video signal. FIG. 3 is a block diagram showing a circuit configuration of a system.

First, an example of the configuration of the video signal recording system will be described.

Reference numeral 61 denotes a main part of the video signal recording system. The video signal recording system 61 includes a sampling frequency conversion unit 62, a band compression unit 63, an error correction encoding unit 64, a channel coding unit 65, and a signal addition unit 66. And a recording current variable amplifier 67.

The video signal supplied to the video signal input terminal 62a is divided into a plurality of blocks having a fixed number of pixels and lines in a two-dimensional manner via a sampling frequency conversion unit 62, and a two-dimensional DCT (discrete cosine) is provided. transfor
m) An operation is performed to obtain a two-dimensional DCT transform coefficient. Then, the two-dimensional DCT coefficients are rearranged into one-dimensional DCT coefficients and supplied to the band compressing unit 63.
, Each of the DCT coefficients is quantized, and further subjected to variable-length coding to be band-compressed. The band-compressed signal is further transmitted to the error correction coding unit 6.
4, an error correction code is added to the band compression signal via the error correction coding unit 64, and the resultant signal is supplied to the channel coding unit 65. The data of the band-compressed signal to which the error correction code is added via the channel coding unit 65 suppresses a low-frequency component such as an 8-10 conversion code, for example, a bit array suitable for the characteristics of the magnetic recording / reproducing system. A process of converting the data into a bit array that can be performed by the channel coding method is performed.

Further, the band-compressed signal data thus processed and to which the error correction code is added is supplied to the signal adding section 66, and the band-compressed signal data to which the error correction code is added is applied to the data. The recording servo pattern data required for tracking and reproducing the recording pattern recorded on the magnetic tape 29 via the signal adding section 66 by the MR type head section 31 is added to the recording current variable amplifier 67. Supplied.

On the other hand, when the tape cassette 20 is mounted in the state shown in FIG. 2, the data stored in the EEPROM 27 is read out to the system control circuit unit 5 through the memory interface 3, and the read data is read out. Thus, the signal recording / reproducing characteristics of the magnetic tape 29 incorporated in the tape cassette 20 are determined. When the operation unit 7 is operated to the recording state, a recording mode signal Sc for setting the recording current of the magnetic tape 29 according to the determination result is input from the system control circuit unit 5 to the recording current control input of the recording current variable amplifier 67. 67a, the magnetic tape recording current is set.

Then, a recording signal Sr including the recording signals Sr1 and Sr2 is generated via the recording current variable amplifier 67, and the recording signal Sr1 is supplied to the inductive head 32A, and the recording signal Sr2 is converted to the inductive head 32B. And recorded on the magnetic tape 29.

Next, an example of the configuration of the video signal reproducing system will be described.

In FIG. 5, reference numeral 68 denotes a main part of the video signal reproducing system.
9. Equalization detection unit 70, error correction unit 71, band expansion unit 72
And a sampling re-frequency conversion unit 73.

The reproduced signals Sp1 and Sp reproduced from the magnetic tape 29 by the MR heads 31A and 31B.
The reproduction signal Sp obtained by adding the error correction code to the reproduction signal of No. 2 is amplified through the reproduction amplifier 69 to a signal level necessary for processing by the equalization detection unit 70 at the next stage, and is continued. The equalization detection unit 7
Through 0, a code that is equivalent to a signal waveform suitable for signal detection and that has been converted by a channel coding method during recording is decoded into an original code. The band-compressed signal to which the decoded error correction code is added is supplied to the error correction unit 71, and error correction is performed based on the error correction code via the error correction unit 71. This produces a band-compressed signal with corrected errors.

Further, the band-compressed signal in which the error has been corrected is supplied to the band extending unit 72, and the signal is subjected to signal processing reverse to that of the band compressing unit 63 via the band extending unit 72 and expanded. The video signal supplied to the video signal input terminal 62a is supplied to the sampling re-frequency conversion unit 73, and is subjected to a process reverse to that of the sampling frequency conversion unit 62 via the sampling re-frequency conversion unit 73. The original video signal is restored and output from the video signal output terminal 73a.

Further, in the examples shown in FIGS. 2 to 5, the recording / reproduction of the video signal is performed in the state of the digital signal. However, the present invention is not limited to such an example in which recording / reproduction is performed in the state of a digital signal, and when recording / reproduction is performed in the state of an analog signal, a luminance signal component constituting a video signal is an example. And recording an analog signal component obtained by mixing a signal component obtained by FM-modulating a carrier signal component with the luminance signal component and a low-frequency conversion color signal component obtained by frequency-converting the color signal component into a low frequency. Of course, the present invention may be applied to the case where reproduction is performed.

Next, referring to FIG. 1, the same reference numerals are given to the same parts as in FIGS.
R type heads 31A and B and induction type magnetic head 3
An example of the protrusion amount variable mechanism of 2A and 2B will be described.

In FIG. 1A, 45A, 45B, 45
Reference numerals C and 45D denote examples of a head protrusion amount variable mechanism, respectively. The induction type magnetic head 32A is attached to the rotary magnetic head drum 60 via the protrusion amount variable mechanism 45A, and the induction type magnetic head 32B is provided The MR type head 31A is mounted on the rotary magnetic head drum 60 via the mechanism 45C via the mechanism 45B, and the MR type head 31B is mounted on the rotary magnetic head drum 60 via the mechanism 45D via the variable protrusion amount mechanism 45C. To the rotating magnetic head drum 60.

The induction type magnetic heads 32A and 32B
Each of the MR type heads 31A and 31B includes an operating gap 32C of the induction type magnetic head 32A and the MR type head 31.
The angle division between the operation gap 31D of the MR type head 31B and the operation gap 32D of the induction type magnetic head 32B is 90 degrees.
At an angle, and the angle division between the operating gap 32D of the induction type magnetic head 32B and the operation gap 31C of the MR type head 31A is 90 degrees, and the operation gap portion 31C of the MR type head 31A and the induction type magnetic head 32A. At the position where the angle division between the working gaps 32C is 90 degrees, the head protrusion variable mechanisms 45A, 45B, 45C and 45D are attached to the rotating magnetic head drum 60.

The head protrusion amount variable mechanism 4
Each of 5A, 45B, 45C, and 45D is configured by an element that converts an electrical change made of a piezoelectric element into a mechanical displacement as an example. The head protrusion variable mechanism 45A moves the operating gap 32C of the induction type magnetic head 32A from the magnetic tape guide surface portion 60A of the rotating magnetic head drum 60 as shown in FIG. 1B according to the bias voltage supplied to the piezoelectric element. The working gap 32C is made to protrude toward the magnetic tape 29 so that the working gap 32C is pressed against the magnetic tape, and conversely, the working gap 32C is retracted from the magnetic tape 29 as shown in FIG. 1C. It is provided for displacing to.

The head protrusion amount variable mechanism 45C
In response to the drive signal supplied to the piezoelectric element, the operating gap 31C of the MR type head 31A is moved to the magnetic tape guide surface 60 of the rotating magnetic head drum 60 as shown in FIG.
A is protruded from the magnetic tape 29 toward the magnetic tape 29, and the operating gap 31C is pressed against the magnetic tape. On the contrary, the operating gap 31C is provided to retreat from the magnetic tape 29 to the position shown in FIG. 1B. It is a thing.

The head protrusion amount variable mechanism 45B
The operating gap 32D of the induction type magnetic head 32B is changed according to the drive signal supplied to the piezoelectric element, as shown in FIG.
0A toward the magnetic tape 29, the operating gap 32D is pressed against the magnetic tape, and
Conversely, the operation gap 32D is provided to retreat from the magnetic tape 29 to the position shown in FIG. 1C.

Further, the head protrusion variable mechanism 45D responds to a drive signal supplied to the piezoelectric element.
The operating gap 31D of the MR type magnetic head 31B is shown in FIG.
As shown in C, the rotating magnetic head drum 60 is projected from the magnetic tape guide surface 60A toward the magnetic tape 29,
The operation gap 31D is provided in a state of being pressed against the magnetic tape, and the operation gap 31D is provided to retreat from the magnetic tape 29 to the position shown in FIG. 1D.

That is, a signal is recorded on the magnetic tape in a state where only the operation gap 32C (32D) side of the induction type magnetic head 32A (32B) is pressed against the magnetic tape 29 by the head protrusion variable mechanism 45A (45B). The state where only the operation gap 31C (31D) side of the MR type magnetic head 31A (31B) is pressed against the magnetic tape 29 by the head protrusion variable mechanism 45C (45D) is a state where signals are reproduced from the magnetic tape. is there.

The magnetic tape 29 is being loaded toward a predetermined position on the rotary head drum 60, the magnetic tape 29 thus loaded is being unloaded, or the magnetic tape 29 is being loaded onto the rotary head drum 60. In a pause state where the magnetic tape is stopped while the rotary head drum 60 is being rotated while the rotary head drum 60 is being rotated, as shown in FIG. 1D, the operation of the induction type magnetic head 32A (32B) is performed. Gap 32C
Both (32D) and the operating gap 31C (31D) of the MR type magnetic head 31A (31B) are retracted from the magnetic tape 29 to prevent wear of these operating gaps.

In the example shown in FIG. 1, when recording tracks on the magnetic tape 29 are reproduced, so-called overwriting recording / reproduction is performed to eliminate the guard band between the recording tracks and improve the recording density. In order to suppress the crosstalk component from the adjacent track, the width-direction angle of the operating gap 32C of the induction magnetic head 32A with respect to the recording track recorded by the induction magnetic head 32A and the induction magnetic head 32B. The angle in the width direction of the operation gap 32 of the induction type magnetic head 32B with respect to the recorded recording track is made different.

Accordingly, the operating gap 31 of the MR type head 31A for reproducing the recording track recorded in this manner.
The angle in the width direction of C with respect to the extension direction of the recording track is set to an angle corresponding to the angle with respect to the extension direction of the recording track in the width direction of the operating gap 32C of the inductive magnetic head 32A, and thus recording is performed. The angle of the width direction of the working gap 31D of the MR type head 31B for reproducing the recording track with respect to the extension direction of the recording track matches the angle of the width direction of the working gap 32D of the induction type magnetic head 32B with respect to the extension direction of the recording track. Angle is set.

The head protrusion amount means that the MR type heads 31A, B and the induction type magnetic heads 32A, B are projected from the magnetic tape guide surface 60A, and the operating gaps C, D, 32C, D of these heads are changed to the magnetic tape 29. These pressure gaps when pressing against the magnetic tape guide surface 6
In this example, this dimension is set to about 25 μm as an example, and the contact state (so-called “round”) between the magnetic tape and these heads is optimized. However, this dimension is dependent on the rigidity characteristics of the magnetic tape used and the radius of curvature of the sliding surface of the magnetic tape near the working gap of these heads. Of course.

In the MR type head, the influence of the worn state of the tape sliding surface on the signal reproduction characteristics tends to be greater than that of the induction type magnetic head. Therefore, in the present embodiment, as a countermeasure, the head protrusion amount on the MR type head side is set to about 5 μm, and the protrusion amount of the inductive magnetic head is set to about 25 μm, which is smaller than that. Is also good.

In the example shown in FIG. 1, the induction type magnetic heads 32A and 32B and the MR type heads 31A and 31B are used.
B were arranged along the magnetic tape guide surface 60A of the rotating magnetic head drum 60 at intervals of 90 degrees. However, in this embodiment, as shown in FIG. 6, the distance between the induction type magnetic heads 32A and 32B is 180 degrees.
The MR type heads 31A and 31B maintain the angle division state of degrees.
With the angle division of 180 degrees maintained between them, the induction type magnetic head 31A and the MR type head 32A are arranged close to each other, and the induction type magnetic head 32B and the MR type head 31B are arranged close to each other. May be provided.

Next, referring to FIG. 7, the same parts as those in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description is omitted.
R type heads 31A and B and induction type magnetic head 32A
An example of the control unit of the protruding mechanism of FIGS.

In FIG. 7A, reference numeral 80 is a block diagram showing an example of a main part of the control section. The control section 80 includes a drive section 81, a control section 82, and a frequency conversion section 9 of a head protrusion mechanism.
0 and a modulator 91. And 83
Reference numeral denotes a rotary transformer. Various types of rotary transformers 83 are known. As an example, as shown in a sectional view of FIG. A desk-shaped head mounted coaxially with the rotating shaft 87 on the lower surface portion 60B side of the rotating magnetic head drum 60 mounted on a rotating shaft 87 of a head drum motor 86 rotatably supported via a shaft. Rotor 88 and this rotor 88
And fixed drum 8 in a state where
4 is constituted by a desk-shaped stator 89 mounted coaxially with the rotation shaft 85 on the upper surface portion 84A.

On the side of the rotor 88, a first signal coil 88-1, a second signal 88-2, a third signal coil 8
8-3, a fourth signal coil 88-4 and a fifth signal coil 88-5 are provided.
, A second signal coil 89-2, a third signal coil 89-3, a fourth signal coil 89-4, and a fifth signal coil 89-5. The signal coil 88-1 and the first signal coil 89-1,...
, And between the fifth signal coil 88-5 and the fifth signal coil 89-5, the rotor 88 and the stator 89
, And the first signal coil 88-1 and the first signal coil 89-1,..., And the fifth signal coil 88-5 and the fifth signal coil 89- 5
The rotary transformer section is configured so that a signal is transmitted between them.

In FIG. 7B, Sr, Sp, and FSC
The signal line indicated by k is connected to each of the first signal coils 89-1,..., 89-5 disposed on the stator 89 as shown in FIG. Are signal lines to be input and output. FSck will be described later.

Next, the operation of the control unit 80 shown in FIG. 7 will be described.

A signal generated according to the operation of the operation unit 7 from the operation unit 7 shown in FIG. 2, for example, a reproduction operation, a recording operation / stop / pause operation, a fast-forward / rewind, or a tape loading / The operation information signal Sck of the operation unit 7 generated according to each operation mode of unloading is input to the frequency conversion unit 90, and is different from each other in each of these operation modes via the frequency conversion unit 90. It is converted into a frequency signal of a frequency value. The frequency signals corresponding to the respective operation modes converted into the frequency signals are input to the modulator 91, and a predetermined carrier frequency signal is modulated to obtain an operation signal FSck. , And the signal is transmitted from the signal coil 89-5 to the fifth signal coil 88-5 and input to the control unit 82.

The reason for providing the step of frequency conversion and further modulation is that it is difficult to transmit the DC signal component via the rotary transformer 83, and the fifth signal coil 88- If the signal transmission means using a slip ring and a metal shoe is used instead of the signal transmission means according to 5 and 89-5, the operation information signal Sck can be transmitted as it is. The operation information signal S
If the signal format of ck is a PCM signal, channel coding can be performed as necessary, and the signal can be transmitted through the rotary transformer unit 83. Furthermore, the signal form of the operation information signal Sck may be an information signal based on a code number.

The operation information signal FSck input to the control unit 82 is demodulated into the original operation information signal Sck via the control unit 82, and the demodulated operation information signal Sck
Is supplied to the drive unit 81. A variable control is performed via the drive unit 81 to vary the head protrusion amount by each of the head protrusion amount variable mechanisms 45A, 45B, 45C, and 45D according to the operation information signal Sck.

That is, when the content of the operation information signal Sck is information indicating a reproduction operation, as shown in FIG.
The R-type heads 31A and 31B are connected to the magnetic tape guide surface 60.
A, and is pressed against the magnetic tape 29. On the contrary, the induction type magnetic heads 32A and 32B are maintained in a state of being separated from the magnetic tape 29, or in a state where the pressing force on the magnetic tape 29 is weakened.

When the content of the operation information signal Sck is information indicating a recording operation, the induction type magnetic heads 32A and 32B are made to protrude from the magnetic tape guide surface 60A as shown in FIG. Let M
The R-type heads 31A and 31B are kept apart from the magnetic tape 29, or are kept in a state where the pressing force against the magnetic tape 29 is weakened.

If the content of the operation information signal Sck is information indicating any one of a stop / pause operation, a fast forward / rewind operation, and a tape loading / unloading operation, as shown in FIG. 1D. Induction type magnetic heads 32A and 32B and MR type head 31A
31B and 31B are kept apart from the magnetic tape 29, or are kept in a state where the pressing force against the magnetic tape 29 is weakened.

If the operation information signal Sck is information indicating a recording operation, as shown in FIG. 7A, the first signal coil 89-1 is further supplied to the recording current variable amplifier shown in FIG. The recording signal Sr1 is supplied from the first signal coil 89-1 to the first signal coil 88-1.
The recording signal Sr2 is supplied from the recording current variable amplifier 67 to the second signal coil 89-2, and is supplied to the induction type magnetic head section 32A to be recorded at a predetermined position on the magnetic tape 29. The signal is transmitted from the second signal coil 89-2 to the second signal coil 88-1 and supplied to the inductive magnetic head 32B to be recorded at a predetermined position on the magnetic tape 29.

If the operation information signal Sck is information indicating a reproducing operation, as shown in FIG. 7A, the recording signal reproduced from the magnetic tape 29 by the MR type head section 31A is further transmitted to the MR type head. The third signal coil 88-3 supplies the signal from the section 31A to the third signal coil 88-3, the third signal coil 89-3 transmits the third signal coil 89-3, and the reproduction output from the third signal coil 89-3. Signal Sp
1 is supplied to the input side of the regenerative amplifier 69 shown in FIG.
A recording signal reproduced from the magnetic tape 29 by the MR head 31B is supplied from the MR head 31B to the fourth signal coil 88-4, and from the fourth signal coil 88-4 to the fourth signal coil. 89-4, and the reproduced signal Sp output from the fourth signal coil 89-4.
2 is supplied to the input side of the regenerative amplifier 69.

[0078]

As described above, according to the method for controlling the position of a rotary head according to the first aspect of the present invention, a rotary head for recording on a magnetic tape wound around a predetermined area of the rotary magnetic head drum is used. When a signal is recorded by the head, the rotating head for reproduction is controlled so as to be at a position separated from the magnetic tape wound around a predetermined area of the rotating head drum, and is wound around a predetermined area of the rotating magnetic head drum. When a signal is reproduced from the attached magnetic tape by the reproducing rotary head, a position where the reproducing rotary head is brought into contact with the magnetic tape wound around a predetermined range of the rotary head drum is set. By doing so, it is possible to avoid unnecessary wear of the reproducing rotary head.

According to the position control method of the rotary head according to the third aspect of the present invention, the position where the rotary head for recording is brought into contact with the magnetic tape wound around a predetermined area of the rotary head drum. And, while being able to move between the position separated from this magnetic tape,
The rotating head for reproduction can be moved between a position where the rotating head is brought into contact with a magnetic tape wound around a predetermined area of the rotating head drum and a position separated from the magnetic tape, When recording signals on the magnetic tape wound around a predetermined area of the rotating magnetic head drum by the recording head, the recording head is wound around a predetermined area of the rotating head drum. The position of the rotating magnetic head drum is controlled so that the rotating head for reproduction is at a position separated from the magnetic tape wound around a predetermined area of the rotating head drum. When a signal is reproduced from a magnetic tape wound around a predetermined range by a rotary head for reproduction, the rotary head for reproduction is rotated by a rotary head drum. The rotary head for recording should be located at a position abutted against the magnetic tape wound around a predetermined range, and at a position separated from the magnetic tape wound around a predetermined range of the rotary head drum. When recording signals from the magnetic tape by the recording rotary head and when reproducing signals from the magnetic tape by the reproducing rotary head, the recording rotary head and the reproducing By controlling the rotary head so that it can be separated from the magnetic tape wound around a predetermined area of the rotary head drum, it is possible to avoid unnecessary wear of the rotary head for recording and the rotary head for reproduction. it can.

According to the position control method of the rotary head according to the fifth aspect of the present invention, the recording rotary head is brought into contact with the magnetic tape wound around a predetermined area of the rotary head drum at a predetermined contact pressure. And a reproducing head can be moved between a position where the magnetic tape is brought into contact with the magnetic tape and a position where the magnetic tape comes into contact with the magnetic tape with a contact pressure weaker than the predetermined contact pressure. Between the position where the magnetic tape wound around the predetermined area is brought into contact with the magnetic tape with a predetermined contact pressure and the position where the magnetic tape is brought into contact with the magnetic tape with a lower contact pressure than the predetermined contact pressure. When a signal is recorded by a recording rotary head on a magnetic tape wound around a predetermined range of a rotary magnetic head drum, the recording The rotary head is brought into contact with the magnetic tape wound on a predetermined area of the rotary head drum with a predetermined contact pressure, and the rotary head for reproduction is wound on a predetermined area of the rotary head drum. A control is performed so that the magnetic tape is brought into contact with the attached magnetic tape with a contact pressure weaker than the predetermined contact pressure. When reproducing, the reproducing rotary head is brought into contact with the magnetic tape wound around a predetermined area of the rotary head drum with a predetermined contact pressure, and the recording rotary head is rotated. At a position where it comes into contact with the magnetic tape wound around a predetermined range of the rotary head drum with a contact pressure weaker than the predetermined contact pressure. The recording rotary head and the reproducing rotary head are controlled when a signal is recorded on the magnetic tape by the recording rotary head and when the signal is reproduced from the magnetic tape by the reproducing rotary head. By controlling the magnetic tape to be in a position where it comes into contact with the magnetic tape with a contact pressure weaker than the predetermined contact pressure,
Unnecessary wear can be avoided without separating the recording rotary head and the reproducing rotary head from the magnetic tape.

According to the rotary head position control device of the present invention, the position at which the rotary head for reproduction comes into contact with the magnetic tape wound around a predetermined area of the rotary head drum. When recording signals on a magnetic tape wound around a predetermined range of a rotating magnetic head drum by a recording rotary head, a signal can be moved between the magnetic tape and a position separated from the magnetic tape. The rotating head for reproduction is controlled so as to be located at a position separated from the magnetic tape wound around a predetermined area of the rotating head drum, and the reproduction is performed from the magnetic tape wound around a predetermined area of the rotating magnetic head drum. When a signal is reproduced by the rotary head for reproduction, the rotary head for reproduction is applied to a magnetic tape wound around a predetermined area of the rotary head drum. By controlling so as to be as was contacting position, it is possible to avoid unnecessary wear of the reproducing rotary head.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a projecting operation of a magnetic head provided in a rotary head device according to the present invention.

FIG. 2 is a configuration diagram for explaining an example of a rotary head type magnetic recording / reproducing apparatus according to the present invention.

FIG. 3 is a configuration diagram for explaining an example of a tape cassette applicable to the rotary head type magnetic recording / reproducing apparatus.

FIG. 4 is a configuration diagram for explaining an example of a configuration of a magnetic head applicable to the rotary head type magnetic recording / reproducing apparatus.

FIG. 5 is a block diagram for explaining an example of a signal recording / reproducing circuit applicable to the rotary head type magnetic recording / reproducing apparatus.

FIG. 6 is a configuration diagram for explaining another example of an arrangement of magnetic heads applicable to the rotary head type magnetic recording / reproducing apparatus.

FIG. 7 is a diagram for explaining an example of an operation of a control unit for controlling a protrusion operation of the magnetic head according to the present invention.

[Explanation of symbols]

29 ... magnetic tape, 31A, B ... MR type head,
32A, B ... Inductive magnetic head, 60 ... Rotating magnetic head drum, 81 ... Drive unit of head ejection mechanism, 82 ... Control unit, 83 ... Rotary transformer unit

Claims (10)

[Claims] 1. A signal is recorded on a magnetic tape wound around a predetermined area of a rotary head drum having a rotary head for recording and a rotary head for reproduction by the rotary head for recording, and a signal is recorded on the magnetic tape. A rotating head mounting position control method for reproducing a signal recorded on the magnetic tape from the magnetic tape by using the rotating head, wherein the reproducing rotary head is mounted on the rotary head drum. Moving between a position in contact with the magnetic tape wound around a predetermined area of the rotary magnetic head drum and a position separated from the magnetic tape. When recording a signal on the magnetic tape wound on the recording head by the recording rotary head, the reproducing rotary head is The magnetic tape wound around a predetermined area of the rotating head drum is controlled to be separated from the magnetic tape, and the magnetic tape wound around a predetermined area of the rotating magnetic head drum is used by the rotating head for reproduction. When the signal is reproduced, control is performed such that the rotary head for reproduction is brought into contact with a magnetic tape wound around a predetermined range of the rotary head drum. Position control method. 2. The magnetic tape is incorporated in a tape cassette, pulled out of the tape cassette in a state where the magnetic tape is mounted at a predetermined position with respect to the rotary head drum, and wound around a predetermined area of the rotary head drum. 2. The method according to claim 1, wherein the position of the rotary head is controlled to be controlled. 3. A signal is recorded on a magnetic tape wound around a predetermined area of a rotary head drum having a rotary head for recording and a rotary head for reproduction by the rotary head for recording, and the signal for reproduction is recorded. A method for controlling a mounting position of a rotary head on a rotary magnetic head drum, wherein a signal recorded on the magnetic tape is reproduced from the magnetic tape by the rotary head, wherein the rotary head for recording is mounted on the rotary head drum. And a position between the magnetic tape wound around the predetermined range and a position separated from the magnetic tape. The position of the magnetic tape wound around a predetermined area of the rotating head drum is in contact with the magnetic tape, and the position of the magnetic tape is away from the magnetic tape. When recording signals on the magnetic tape wound around a predetermined range of the rotary magnetic head drum by the recording rotary head, the recording rotary head is A position where the magnetic tape wound around a predetermined area of the rotary head drum is brought into contact with the magnetic tape, and the rotary head for reproduction is moved from the magnetic tape wound around a predetermined area of the rotary head drum. When a signal is reproduced from the magnetic tape wound around a predetermined area of the rotary magnetic head drum by the rotary head for reproduction, the rotary head for reproduction is controlled by the rotary head. At a position where the recording tape is brought into contact with the magnetic tape wound around a predetermined area of the drum, the recording head is rotated. When recording signals from the magnetic tape by the recording rotary head and controlling the magnetic tape for reproduction from the magnetic tape wound around a predetermined area of the magnetic drum. Controlling the rotation of the recording head and the rotation of the reproducing head so that the recording and reproducing heads can be separated from the magnetic tape when the signal is not reproduced by the rotating head. Method. 4. The magnetic tape is incorporated in a tape cassette, pulled out from the tape cassette in a state where the magnetic tape is mounted at a predetermined position with respect to the rotary head drum, and wound around a predetermined area of the rotary head drum. 4. The method according to claim 3, wherein the position of the rotary head is controlled to be controlled. 5. A signal is recorded on a magnetic tape wound around a predetermined range of a rotary head drum having a rotary head for recording and a rotary head for reproduction by the rotary head for recording, and a signal is recorded on the magnetic tape. A method for controlling a mounting position of a rotary head on a rotary magnetic head drum, wherein a signal recorded on the magnetic tape is reproduced from the magnetic tape by the rotary head, wherein the rotary head for recording is mounted on the rotary head drum. Between the position where the magnetic tape wound around the predetermined range is brought into contact with the magnetic tape with a predetermined contact pressure and the position where the magnetic tape is brought into contact with the magnetic tape with a lower contact pressure than the predetermined contact pressure. The magnetic head wound around a predetermined area of the rotary head drum. The magnetic tape can be moved between a position where the magnetic tape is brought into contact with a predetermined contact pressure and a position where the magnetic tape comes into contact with the magnetic tape with a contact pressure weaker than the predetermined contact pressure, and the magnetic tape is rotated. When recording a signal on the magnetic tape wound around a predetermined range of the magnetic head drum by the recording rotary head,
The rotary head for recording is brought into contact with a magnetic tape wound around a predetermined area of the rotary head drum with a predetermined contact pressure, and the rotary head for reproduction is connected to the rotary head drum. The magnetic tape wound around a predetermined area of the rotating magnetic head drum is controlled so that the magnetic tape wound around the predetermined area of the rotating magnetic head drum is brought into contact with the magnetic tape wound with a predetermined contact pressure lower than the predetermined contact pressure. When a signal is reproduced by the reproducing rotary head from a position where the reproducing rotary head is brought into contact with a magnetic tape wound around a predetermined range of the rotary head drum with a predetermined contact pressure. Along with
The magnetic tape is controlled such that the recording rotary head is brought into contact with the magnetic tape wound around a predetermined range of the rotary head drum with a contact pressure weaker than the predetermined contact pressure. When recording signals with the recording rotary head and when not reproducing signals from the magnetic tape with the reproducing rotary head, the recording rotary head and the reproducing rotary head are A method for controlling the position of a rotary head, wherein the position is controlled so that the magnetic tape is brought into contact with the magnetic tape with a contact pressure weaker than the predetermined contact pressure. 6. The magnetic tape is incorporated in a tape cassette, pulled out of the tape cassette in a state where the magnetic tape is mounted at a predetermined position with respect to the rotary head drum, and wound around a predetermined range of the rotary head drum. 6. The rotary head position control method according to claim 5, wherein the control is performed as follows. 7. A signal is recorded on a magnetic tape wound around a predetermined range of a rotary head drum having a rotary head for recording and a rotary head for reproduction by the rotary head for recording, and the signal for reproduction is recorded. A rotary head for mounting a rotary head to a rotary magnetic head drum configured to reproduce a signal recorded on the magnetic tape from the magnetic tape by the rotary head, wherein the rotary head for reproduction is connected to the rotary head drum. Moving between a position in contact with the magnetic tape wound around a predetermined area of the rotary magnetic head drum and a position separated from the magnetic tape. When recording a signal on the magnetic tape wound on the recording head by the recording rotary head, the reproducing rotary head is The magnetic tape wound around a predetermined area of the rotating head drum is controlled to be separated from the magnetic tape, and the magnetic tape wound around a predetermined area of the rotating magnetic head drum is used by the rotating head for reproduction. When a signal is reproduced, a head position control means is provided for setting the rotary head for reproduction to a position where the rotary head comes into contact with a magnetic tape wound around a predetermined range of the rotary head drum. A rotary head position control device. 8. The magnetic tape is taken out of the tape cassette in a state where the magnetic tape is incorporated in a tape cassette and is mounted at a predetermined position with respect to the rotary head drum, and is wound around a predetermined area of the rotary head drum. 8. The position control device for a rotary head according to claim 7, wherein the control is performed as follows. 9. A signal is recorded on a magnetic tape wound around a predetermined area of a rotary head drum having a rotary head for recording and a rotary head for reproduction by the recording rotary head, and a signal is recorded on the magnetic tape. A rotary head mounting position control device for a rotary magnetic head drum configured to reproduce a signal recorded on the magnetic tape from the magnetic tape by the rotary head, wherein the rotary head for recording is an induction type head. 8. The rotary head position control device according to claim 7, wherein said rotary head for reproduction is an MR type head. 10. A signal is recorded on a magnetic tape wound around a predetermined area of a rotary head drum having a rotary head for recording and a rotary head for reproduction by the rotary head for recording, and a signal for the reproduction is recorded. A rotary head for mounting a rotary head to a rotary magnetic head drum configured to reproduce a signal recorded on the magnetic tape from the magnetic tape by the rotary head, wherein the rotary head for reproduction is connected to the rotary head drum. The rotating head for recording is more than the predetermined amount of the rotating head drum than the amount of protrusion from the rotating head drum in order to make the position abutted against the magnetic tape wound around the predetermined range. That the amount of protrusion from the rotary head drum for making contact with the magnetic tape wound around the area is increased. The rotary head position control device according to claim 7, wherein: