JPH076311A - Magnetic recording and reoproducing device - Google Patents

Abstract

PURPOSE:To simplify a device constitution by providing a specified difference of level between two sets of magnetic heads whose head widths are larger than a track pitch and making the following magnetic head scan projectingly from a recording track formed by the leading magnetic head. CONSTITUTION:The same head width Tw is selected for magnetic heads A to D and a value for the width Tw is selected larger by specified amount than a track pitch Tp. Further, as to the heads A and B, the head B of a negative azimuth angle is arranged with a difference of level by the pitch Tp against the head A of a positive azimuth angle. Thus, a part of an area scanned by the leading heads at the time of recording is overwritten and recording tracks TA and TB are formed by the sequential pitch Tp. The heads C and D are arranged having a difference of level (m+2Tp) larger by a specified amount (m) against a distance twice as large as the pitch Tp. Recording tracks having azimuth angles opposite to those formed by the heads A and B are scanned by the heads C and D by straddling these tracks.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 2 and 3) Operation (FIGS. 2 and 3) Embodiment (1) Overall Configuration of Embodiment (FIG. 1) ) (2) Arrangement of magnetic heads (Figs. 2 to 5) (3) Effects of the embodiment (4) Other embodiments (Fig. 6) Effects of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing device, and can be applied to, for example, an external storage device of a computer.

[0003]

2. Description of the Related Art Conventionally, in a magnetic recording / reproducing apparatus for converting an audio signal into a digital signal and recording it on a magnetic tape, a non-tracking technique is applied to simplify the structure of a magnetic tape running system. Have been proposed. That is, this magnetic recording / reproducing apparatus is
The audio data is divided into predetermined blocks, and address data and error correction code are added to each block to generate recording data.

Further, this magnetic recording / reproducing apparatus has a pair of recording / reproducing magnetic heads mounted on a rotary drum at a predetermined angular interval, and a pair of magnetic heads for recording / reproducing are formed at an angular interval of 180 degrees. The reproduction-only magnetic head is mounted on a rotary drum, and the rotary drum is rotationally driven at a predetermined rotational speed. Further, the magnetic recording / reproducing apparatus winds a magnetic tape around a rotating drum and runs the magnetic tape at a predetermined speed, and in this state, sequentially outputs the recorded data to the recording / reproducing magnetic head in synchronization with the rotation cycle of the rotating drum.

As a result, this magnetic recording / reproducing apparatus sequentially forms recording tracks of positive and negative azimuth angles during recording. At this time, the guard band is omitted to sequentially form recording tracks, and at the same time, the audio tracks are recorded on the recording tracks. The data can be recorded in azimuth.

On the other hand, at the time of reproducing, this magnetic recording / reproducing apparatus keeps the magnetic tape running speed at the same speed as that at the time of recording, and rotationally drives the rotating speed of the rotary drum at twice the rotating speed at the time of recording ( That is, double density Sukiyan). Therefore, in the magnetic recording / reproducing apparatus, during reproduction, the two sets of magnetic heads scan the recording tracks obliquely.

Here, the read-only magnetic head is
Like scanning recording tracks with opposite azimuth angles,
The magnetic head having a corresponding azimuth angle is provided with a step. As a result, the magnetic recording / reproducing apparatus scans the scanning locus of the recording / reproducing magnetic head corresponding to the reproducing-only magnetic head by ½ track pitch when the double density scanning is performed during reproduction.

As a result, in this magnetic recording / reproducing apparatus, for an area in which the read-only magnetic head or the read / write magnetic head is largely off-tracked, the read / write magnetic head or read-only magnetic head having the corresponding azimuth angle is set to a small off-track amount. It is designed to scan. That is, this magnetic recording / reproducing apparatus mounts two sets of magnetic heads on a rotary drum and performs double-density scanning at the time of reproduction to form a state in which each magnetic head scans a recording track obliquely. The magnetic head is designed to scan a recording track having an azimuth angle corresponding to the magnetic head with a small amount of off-track without leakage.

Here, this magnetic recording / reproducing apparatus records an audio signal in the form of a digital signal,
Even if the track is slightly off-tracked, the audio data can be demodulated, and by adding an error correction code and recorded, the correct audio data can be reproduced.

As a result, the magnetic recording / reproducing apparatus sequentially demodulates the reproduced signals obtained from the two sets of magnetic heads to perform error correction processing, and for blocks that have been correctly error-corrected, address data added to the blocks. Is stored as a reference in a predetermined memory. Further, when the reproduced audio data of each recording track is stored in the memory, the magnetic recording / reproducing apparatus converts the audio data into an audio signal in the recording track forming order and outputs the audio signal.

As a result, the magnetic recording / reproducing apparatus performs double-density scanning using two sets of magnetic heads, and selectively stores correctly reproduced audio data in the memory and outputs the audio data, so that the magnetic heads are correctly reproduced. The audio signal can be reproduced from the recording tracks that are sequentially formed obliquely without scanning the recording tracks by tracking them on-track.

As a result, in this type of magnetic recording / reproducing apparatus, it is possible to omit the highly accurate tracking control as in the conventional video tape recorder, so that the audio signal can be recorded / reproduced with a simple structure as a whole. Has been done.

[0013]

If a magnetic recording / reproducing device of this kind can be applied to an external storage device of a computer and various data can be recorded / reproduced, the usability of the computer system of this type is improved. It is thought to get. However, in this type of external storage device,
At the time of recording, it is necessary to judge whether or not the data could be recorded correctly, and if the data could not be recorded correctly, it is necessary to record the data again.

That is, when applied to this type of external storage device, it is necessary to configure the magnetic recording / reproducing device so as to perform so-called read-after-write.

In this case, in this non-tracking magnetic recording / reproducing apparatus, read-after-write can be performed by disposing this read-after-write magnetic head in addition to the recording / reproducing magnetic head. However, if the magnetic head for the read-after-write is separately arranged in this way, there is a problem that the structure of the rotary drum becomes complicated accordingly.

As a method for solving this problem, a method is conceivable in which one of the two magnetic heads used in this type of magnetic recording / reproducing apparatus is also used as the read-after-write magnetic head. However, the magnetic head for this read-after write needs to be arranged so that the same track as the data-recorded magnetic head is on-track at the time of recording, and when the non-tracking method is applied to this, at the time of recording, The magnetic heads of the corresponding azimuth angles must be arranged to scan the recording tracks of the opposite azimuth angles.

Therefore, there is a problem that read-after-write cannot be performed if the read-only magnetic head is simply diverted to the read-after-write magnetic head.

The present invention has been made in consideration of the above points. In a magnetic recording / reproducing apparatus for recording / reproducing desired data by applying a non-tracking method, read-after-write can be performed with a simple structure. An attempt is made to propose a magnetic recording / reproducing device that can be used.

[0019]

In order to solve such a problem, in the present invention, a rotary drum 1 rotating at a predetermined speed.
By winding the magnetic tape 2 around the magnetic tape 2 and running it at a predetermined speed, the recording tracks TA and T are sequentially recorded on the magnetic tape 2.
In the magnetic recording / reproducing apparatus 1 for forming desired data D1 by forming B, ... And reproducing the data D1 recorded on the magnetic tape 2, a pair of recording / reproducing with different azimuth angles on the rotary drum 12. Magnetic head A,
B and a pair of reproducing magnetic heads C and D having an azimuth angle corresponding to the recording and reproducing magnetic heads A and B are mounted, and at the time of recording, the rotation speed of the rotary drum 12 with respect to the traveling speed of the magnetic tape 2 is predetermined. Is maintained and the recording / reproducing magnetic heads A, B are driven to sequentially form the recording tracks TA, TB, ... At the same time, the recording / reproducing magnetic heads A, B form the recording tracks TA, TB ,. ... are sequentially scanned by the reproducing magnetic heads C and D, the reproducing signals obtained from the reproducing magnetic heads C and D are processed, and the data D1 recorded by the recording and reproducing magnetic heads A and B is read-after-written and reproduced. Time,
The rotation speed of the rotary drum 12 relative to the running speed of the magnetic tape 2 is switched to a value higher than that during recording, and the reproduction signals output from the recording / reproducing magnetic heads A and B and the reproducing magnetic heads C and D are selectively processed. The data D1 recorded on the magnetic tape 2 is reproduced by accumulating and outputting the data, and the recording / reproducing magnetic heads A and B and the reproducing magnetic heads C and D are reproduced.
Is head width T _W is recording tracks TA, TB, is selected to a value smaller than 2 times the size 2T _P of large and track width T _P than track width T _P of ..., reproducing magnetic heads C, D is During recording, the recording tracks TA, TB formed by the recording / reproducing magnetic heads A, B having corresponding azimuth angles are recorded.
, And the recording tracks TA, TB, ... Adjacent to the recording tracks TA, TB, ... Are scanned by a predetermined value with respect to the recording / reproducing magnetic heads A, B having the corresponding azimuth angles. It is arranged by providing (m + 2nT _P ).

Further, in the second invention, the head width T _W
Is at least 4/3 the size of the track pitch T _P , and has magnetic heads A and B for recording / reproduction and magnetic head C for reproduction.
The same size is selected in D, and the step (m + 2nT _P ) is
A value obtained by subtracting the track pitch T _P from the head width T _W to the integer multiple value 2nT _P that is twice the track pitch (T _W -T _P ).
2nT _P + (T _W −T _P ).

[0021]

The head width T _W of the recording / reproducing magnetic heads A and B and the reproducing magnetic heads C and D is set to the recording tracks TA and T.
Larger than the track width T _P of B, ... and the track width T
_It is selected to be twice as large as _P and smaller than 2T _P , and the reproducing magnetic heads C and D are recording tracks T formed by the recording and reproducing magnetic heads A and B having corresponding azimuth angles during recording.
.. and the recording tracks TA, TB, ... Adjacent to the recording tracks TA, TB, ..
If the reproducing magnetic heads C and D are arranged with a step difference (m + 2nT _P ) with respect to B, the recording tracks TA and T formed by the recording and reproducing magnetic heads A and B are recorded.
B and so on can be read and written by the reproducing magnetic heads C and D, and at the time of reproducing, double density scanning is performed to record and reproduce the magnetic heads A and B and the reproducing magnetic heads C and D on the magnetic tape 2. It is possible to reproduce the data D1 recorded in.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Overall configuration of the embodiment In FIG. 1, reference numeral 1 denotes a data recorder as a whole,
The data D1 output from the computer is recorded on the magnetic tape 2 by using it as an external storage device of the computer, and the data D1 obtained by reproducing the magnetic tape 2 is output to the computer.

That is, the data recorder 1 receives the control command output from the computer via the input / output circuit 3 in the system control circuit 4, analyzes the control command, and controls each circuit block as needed. It outputs a code, which controls the entire operation according to the control command output from the computer. As a result, when the entire operation mode is set to the recording mode, the data recorder 1 inputs the input data D1 input via the input / output circuit 3 to the recording circuit 5, where the input data D1 is non-traffic. Converted to the recording data applied to the King method.

That is, the recording circuit 5 divides the input data D1 input at a predetermined timing into a predetermined block unit, adds an error correction code to each block, and adds address data, whereby the input data D1 is obtained. Converted to recording data D2. This allows the data recorder 1
Outputs the recording data D2 to the amplifying circuit 6 in sequence at a predetermined timing, and the amplifying circuit 6 drives the recording / reproducing magnetic heads A and B according to the recording data D2.

As a result, the data recorder 1 can sequentially form the recording tracks to record the input data D1. At this time, the reproduction signals output from the magnetic heads C and D are processed by the reproduction system. It is designed to be read-after-writeable. Ie magnetic head C
And D have positive and negative azimuth angles, respectively, and are adapted to scan the recording tracks formed by the magnetic heads A and B of positive and negative azimuth angles, respectively.

As a result, the magnetic heads C and D output the reproduction signals, which are the recording results of the magnetic heads A and B, respectively, to the amplifier circuit 7, where the reproduction signals are amplified and output to the reproduction circuit 8. The reproducing circuit 8 demodulates the reproduced signals sequentially input to obtain reproduced data, performs error correction processing on the reproduced data, and outputs the error-corrected data.

The input / output circuit 3 obtains a comparison result between the reproduced data output from the reproducing circuit 8 and the input data D1 stored in a predetermined memory, and determines whether or not the input data D1 can be correctly recorded. To do. Thus, when the data recorder 1 determines that the input data D1 has not been correctly reproduced, it outputs a resend request to the computer and repeatedly records the input data D1.

Thus, the data recorder 1 can record valuable data without damaging it.

On the other hand, during reproduction, the data recorder 1
Reproduces the input data D1 by amplifying the reproduction signals output from the magnetic heads A to D by the amplifier circuit 7 and then outputting the amplified signals to the reproduction circuit 8 where the reproduction signal processing applied to the non-tracking system is executed. To do. That is, the reproducing circuit 8 decodes the sequentially input reproduced signals, then executes error correction processing in block units, and with respect to the block that has been correctly error-corrected, this block is based on the address data added to this block. The reproduction data of is stored in the memory 9.

As a result, the data recorder 1 selectively stores only the reproduced data which can be correctly reproduced in the memory 9, and outputs the reproduced data stored in the memory 9 from the input / output circuit 3. The data recorder 1 corresponds to this recording / reproducing operation.
In the above, the servo circuit 10 controls the magnetic tape running system so that the recording tracks are sequentially formed at the time of recording, and the double density scanning can be performed at the time of reproducing.

That is, in this embodiment, the data recorder 1 mounts magnetic heads A and B having positive and negative azimuth angles in the vicinity of the rotary drum 12 with a predetermined step, and these magnetic heads A and B are mounted. Used for recording and playback. Further, the data recorder 1 sets the magnetic heads C and D of the corresponding azimuth angles at predetermined steps so as to face the magnetic heads A and B of the positive and negative azimuth angles at an angular interval of 180 degrees. The magnetic heads C and D are provided and arranged to perform read-after-write with the magnetic heads C and D, and further non-tracking reproduction processing can be executed.

The data recorder 1 includes the rotary drum 12
The magnetic tape 2 is wound at a winding angle of 180 degrees, and the rotation speed of the rotating drum 12 and the running speed of the magnetic tape 2 are controlled by the servo circuit 10. That is, at the time of recording, the servo circuit 10 causes the rotary drum 1 to rotate at a preset rotation speed.
The magnetic tape 2 is run at a predetermined running speed while driving 2 to rotate, thereby sequentially forming a recording track without guard band and recording data D2 in azimuth.

On the other hand, during reproduction, the servo circuit 10
The magnetic tape 2 is run at the same running speed as during recording, and the rotary drum 12 is rotated at twice the rotating speed during recording, so that the data recorder 1 can be double-density scanned during reproduction. There is.

(2) Arrangement of magnetic heads In this embodiment, the data recorder 1 selects the head width T _W of the magnetic heads A to D at a predetermined value and, as shown in FIG. Provide a rotating drum 1
Magnetic heads A to D are arranged on the magnetic head 2 so that the magnetic heads C and D are used for read-after-write during recording, and the magnetic heads A to D are used as reproducing heads for non-tracking during reproducing. It is designed to get you. In FIG. 2, the magnetic heads A and B represent the state in which the recording tracks are sequentially formed, and the positions of the magnetic heads C and D when the rotary drum 12 is rotated by 90 degrees from this state are indicated by broken lines. Has been done.

That is, the magnetic heads A to D are selected to have the same head width T _W , and this head width T _W is selected to be a value larger than the track pitch T _P by a predetermined value. As a result, even if the magnetic heads A to D are slightly off-tracked, the signal level of the reproduced signal does not deteriorate during read-after-write and during reproduction.

Further, the magnetic heads A and B are arranged such that, with respect to the magnetic head A having a positive azimuth angle, the corresponding magnetic head B having a negative azimuth angle is arranged with a step difference by the track pitch T _P. As a result, the data recorder 1 partially overwrites the area scanned by the preceding magnetic head A or B at the time of recording, and sequentially tracks the track pitch T.
_P is used to form recording tracks TA and TB.

Similarly, for the magnetic heads C and D corresponding to the magnetic heads A and B, the data recorder 1 tracks the magnetic head D having a negative azimuth angle to the magnetic head C having a positive azimuth angle. It is designed to be stepped by T _P. Further, the data recorder 1 arranges the magnetic heads C and D so as to scan the following recording tracks with respect to the magnetic heads A and B, and at this time, the magnetic heads A and B have twice the track pitch T _P. The magnetic heads C and D are arranged by providing a step (m + 2T _P ) larger than the distance by a predetermined value m.

That is, if the magnetic heads C and D are arranged with a step (m + 2T _P ) larger by a predetermined value m with respect to the distance twice the track pitch T _P , the magnetic heads C and D correspond to each other at the time of recording. Scanning is performed so as to straddle a recording track formed by the magnetic heads A and B and a recording track having an opposite azimuth angle. As a result, at the time of recording, the head width is set with respect to this step (m + 2T _P ) so that a sufficient reproduction signal can be obtained from the recording track of the corresponding azimuth angle, that is, the signal level of the reproduction signal does not deteriorate even if it is slightly off-tracked. It can be seen that by choosing T _W , magnetic heads C and D can be used for read-after-write.

On the other hand, at the time of recording, the magnetic heads C and D respectively scan so as to straddle the recording track formed by the corresponding magnetic heads A and B and the recording track having an azimuth angle opposite to each other. When the density scan is performed, the magnetic heads A and C and the magnetic heads B and D having the same azimuth angle scan the recording track without any leakage, and the step (m + 2T _P ) and the head width T _W are selected to perform non-tracking. It can be applied to.

That is, in the case of using the magnetic heads C and D for read-after-write, the signal level of the reproduction signal is 6 [db] as compared with the case of on-track scanning.
When the deterioration range is allowed, the magnetic heads C and D must scan at least half the area of the recording track having the track width T _P.

Corresponding magnetic heads A and C
When the magnetic heads A and C are arranged at a step (m + 2T _P ) as shown in FIG. 3 by taking out one recording track TA0 as a reference, the trailing edge of the magnetic head A is located on the side surface of the recording track TA0. When they match, the magnetic head C scans the trailing side by a step m from this.

FIG. 4 shows a case where the scanning locus of the magnetic head A is displaced forward and backward with x = 0 based on this state. In this case, in the magnetic head A, the head width T _W is more than the track pitch T _P. It can be seen that, by selecting a large value, the signal level of the reproduced signal does not deteriorate even if the scanning locus changes to the trailing side by the value obtained by subtracting the head width T _W from the track pitch T _P (FIG. 4A). That is, in the range where the signal level of the reproduction signal does not deteriorate, it is understood that the recording data can be correctly demodulated even if the scanning position of the magnetic head A is displaced.

As a result, in the data recorder 1,
While the magnetic head A is held in this range by applying the non-tracking method, the reproduction data can be selectively stored in the memory 9 to obtain a correct reproduction result. Is represented by the symbol ◯ (FIG. 4 (B)).

On the other hand, when the displacement x further increases toward the trailing side, or when the displacement x increases toward the leading side from the state shown in FIG. 4, the magnetic head A causes the recording track TA0.
By scanning only a part of the above, the signal level of the reproduction signal lowers accordingly.

Further, from the state where the leading end surface of the magnetic head A coincides with the leading edge of the recording track, or from the state where the trailing end surface of the magnetic head A coincides with the trailing edge of the recording track, respectively. The displacement amount to the leading side and the leading side is

[Equation 1] When the value becomes larger than the value represented by, the magnetic head A scans the adjacent recording track, and the recording track T
Reproduction signals can be obtained from both A0 and the adjacent recording track.

As a result, when the displacement amount x becomes larger than the value represented by the equation (1), the crosstalk between the adjacent and adjacent tracks increases and it becomes difficult to correctly reproduce the data.
This range is represented by the symbol x in FIG. On the other hand, within the range represented by the symbols O and X, the signal level of the reproduction signal only decreases according to the displacement amount x. In this case, since the digital signal is recorded, the error correction processing is performed and the recorded data is recorded. Can be correctly reproduced, and in FIG. 4, this range is indicated by the symbol Δ.

As a result, if the magnetic head C can be used to supplement the range represented by the symbol X, it will be understood that the non-tracking technique can be applied to reproduce the recorded data without omission. Here, in the magnetic head C, by scanning the trailing side of the magnetic head A by the step m, the range of symbols ◯, Δ, and × is displaced to the leading side by the step m with respect to the magnetic head A as a whole. Can be represented by (Fig. 4 (C)
And (D)).

To summarize this (FIGS. 4 (E) and 4 (F)), the remaining magnetic heads C and A are represented by the symbols Δ or ◯ within the range represented by the symbol x of the magnetic heads A and B, respectively.
Must be represented by. Here, the range M represented by the symbol Δ between the boundary with the symbol x and the symbol Δ of the magnetic head A and the boundary with the symbol Δ and the symbol x of the magnetic head C, respectively,

[Equation 2] Is represented by (FIG. 4 (G)).

As a result, the equation (2) is modified by setting M = 0, and the following equation is obtained.

[Equation 3] It is understood that, when the value of the step m is held in the range, the range that cannot be reproduced by the magnetic head A can be reproduced by the corresponding magnetic head C. As a result, in the data recorder 1, the magnetic heads A and C are arranged so as to satisfy the relational expression (3), and the magnetic heads B and D are arranged similarly.

Further, the m and the head width T _W are given by

[Equation 4]

[Equation 5] Is selected so that the data recorder 1 prevents crosstalk from adjacent recording tracks at the time of read-after-write.

By the way, when the magnetic heads A to D are arranged in this way, at the time of read-after-write, the condition that the magnetic heads C and D scan at least half the area of the recording track having the track width T _P is satisfied. To this end, it is necessary to prevent the magnetic heads C and D from squeezing out to the adjacent tracks by ½ or more of the head width during this read-after write. Here, at the time of recording, the magnetic tape running speed is switched to 1/2 as compared with that at the time of reproduction, so that the relationship between the magnetic head A and the magnetic head C is shown in FIG.
, Where m = T _W −T from equation (3).
_{When P} is set, that is, when the scanning trace of the leading end face of the magnetic head A and the scanning trace of the trailing end face of the magnetic head C coincide with each other, the protrusion amount of the magnetic head C to the adjacent track is the largest. You can see it grows.

As a result, the value obtained by subtracting the protrusion amount T _W -T _P from the track pitch T _P is

[Equation 6] It can be seen that this condition is satisfied by selecting so as to satisfy the relational expression.

That is, by modifying the equation (6), the following equation is obtained.

[Equation 7] It is understood that the read-after-write can be performed by selecting the head width T _W of the magnetic heads A to D so as to satisfy the relational expression of

Thus, in this embodiment, the data recorder 1 satisfies the head width T _W of the magnetic heads A to D so as to satisfy the relational expressions (3), (4), (5) and (7).
And the steps are selected, and two sets of magnetic heads A to D are selected.
Is used for read-after-write, and the non-tracking method is applied to reproduce the record data D2, thereby simplifying the overall structure.

(3) Effects of the Embodiments According to the above configuration, two sets of magnetic heads having a large head width by a predetermined width with respect to the track pitch are arranged with a predetermined step, and the trailing side magnetic field is set at the time of recording. By allowing the head to scan the recording track of the azimuth angle corresponding to the head, scanning can be performed by using the subsequent magnetic head, and at the time of reproduction, the non-tracking can be performed by using these two sets of magnetic heads. It is possible to obtain a reproduction signal by applying the method of (1), and thus the magnetic head for read-after-write can be used as the magnetic head for non-tracking.
Therefore, a data recorder having a simple structure can be obtained as a whole.

(4) Other Embodiments In the above embodiments, the case where the step is selected as (m + 2T _P ) has been described, but the present invention is not limited to this, and an arbitrary integer value n is used ( The step may be selected as a value represented by m + 2nT _P ).

Further, in the above-described embodiment, the case where the head widths of the two sets of magnetic heads are selected to be equal values has been described, but the present invention is not limited to this, and the magnetic heads for recording / reproducing and read-after-write. The head widths may be selected differently for and. In this case, for a magnetic head having a small head width, the head width may be selected so that the relational expression (3) is satisfied, and the relation of the expression (5) is satisfied for any magnetic head. It is necessary to select the width.

The relation of the equation (4) must be established for the magnetic head for read-after-write, and in this case, the head width of each of the magnetic heads A and C is T _WA.
And T _WC , instead of equation (7), the following equation

[Equation 8] The relational expression of must be satisfied.

Further, in the above-mentioned embodiment, the case where the pair of magnetic heads A and B and the magnetic heads C and D are arranged close to each other has been described, but the present invention is not limited to this.
As shown in FIG. 6, the magnetic heads may be arranged at angular intervals of 90 degrees.

Further, in the above-mentioned embodiment, during reproduction,
Although the case where the rotation speed of the rotary drum is switched to double the recording speed has been described, the present invention may be replaced with this in which the magnetic tape running speed is switched to 1/2 of the recording speed.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the data recorder to record and reproduce the data of the computer has been described, but the present invention is not limited to this.
The present invention can be widely applied to various magnetic recording / reproducing devices that record / reproduce various data by applying the non-tracking technique and further read / write after recording.

[0063]

As described above, according to the present invention, two sets of magnetic heads having a larger head width than the track pitch are arranged with a predetermined step, and a magnetic head preceded by a trailing magnetic head is formed. By arranging the magnetic head so as to protrude and scan the track, read-after-write can be performed by using the magnetic head following this, and the non-tracking method is applied by using these two sets of magnetic heads during reproduction. As a result, a reproduction signal can be obtained, and thus a magnetic recording / reproducing apparatus having a simple structure can be obtained as a whole.

[Brief description of drawings]

FIG. 1 is a block diagram showing a data decoder according to an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining the operation at the time of recording.

FIG. 3 is a schematic diagram for explaining the operation during the reproduction.

FIG. 4 is a schematic diagram used for the description.

FIG. 5 is a schematic diagram for explaining the operation of the read after write.

FIG. 6 is a schematic diagram for explaining another embodiment.

[Explanation of symbols]

1 ... Data recorder, 2 ... Magnetic tape, 12 ... Rotating drum, AD ... Magnetic head.

Claims (2)

[Claims] 1. A magnetic tape is wound around a rotary drum which rotates at a predetermined speed and is run at a predetermined speed, whereby recording tracks are sequentially formed on the magnetic tape to record desired data in azimuth, and the magnetic tape is further recorded on the magnetic tape. In a magnetic recording / reproducing apparatus for reproducing recorded data, a pair of recording / reproducing magnetic heads having different azimuth angles on the rotating drum, and a pair of reproducing magnetic heads having an azimuth angle corresponding to the recording / reproducing magnetic heads. During recording, the rotational speed of the rotating drum with respect to the running speed of the magnetic tape is maintained at a predetermined value, and the recording / reproducing magnetic head is driven to sequentially form the recording tracks, and The recording track formed by the reproducing magnetic head is sequentially scanned by the reproducing magnetic head, and the reproducing obtained from the reproducing magnetic head is performed. And processing the recording and reproducing magnetic head is read-after-write the data recorded, reproduction, switch the rotational speed of the rotary drum with respect to the running speed of the magnetic tape to a value greater than the time of the recording No.,
The recording / reproducing magnetic head and the reproducing signal output from the reproducing magnetic head are selectively processed and accumulated and output to reproduce the data recorded on the magnetic tape, and the recording / reproducing magnetic head and The reproducing magnetic head is selected such that the head width is larger than the track width of the recording track and smaller than twice the track width, and the reproducing magnetic head has a corresponding azimuth angle at the time of recording. The recording head formed by the recording / reproducing magnetic head and the recording track adjacent to the recording track are arranged with a step difference from the recording / reproducing magnetic head having a corresponding azimuth angle so as to scan the recording track. A magnetic recording / reproducing apparatus characterized in that 2. The head width is 4 of the track pitch.
/ 3 or more, and the same size is selected for the recording / reproducing magnetic head and the reproducing magnetic head, and the step is an integer multiple of twice the track pitch.
2. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus is selected to be larger than an addition value obtained by adding a value obtained by subtracting the track pitch from the head width.