JPH10134302A - Recording track straight forwardness adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording track straight forwardness adjusting device capable of performing the recording track straight forwardness adjustment of a magnetic recording and reproducing device with high accuracy every when magnetic tapes for recording and reproducing straight forwardness adjustment having any kinds of tape widths are used within the allowable range of a format. SOLUTION: The tape width of a straight forwardness adjustment magnetic tape 8 is measured in a tape width measuring part 123 and a straight forwardness error due to the error of the tape width is determined by comparing an error with respect to the reference of the tape width with a experimental value. Then, the error obtained by adding a straight forwardness error data due to the error of the tape width and the straight forwardness error measurement value calculated from the recording patterns of the magnetic tape for straight forwardness adjustment 8 in an adding part 125 is made to be the straight forwardness error of the straight forwardness adjustment tape 8 of its own. At the time of performing the recording track straight forwardness adjustment of other magnetic recording and reproducing device with the straight forwardness adjustment tape 8, the error of the straight forwardness adjustment tape 8 of its own is to be canceled by subtracting the straight forwardness error of the straight forwardness adjustment tape 8 of its own calculated in the above manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording track straightness adjusting device used for a magnetic recording / reproducing device such as a tape recorder or a VTR for recording / reproducing using a tape-shaped medium.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for tape recorders, camera-integrated VTRs, and the like to be smaller and lighter and have higher image quality. Therefore, it is necessary to further increase the recording density on magnetic tapes. Therefore, in order to increase the recording density, for example, in the case of a helical scan type VTR, the track width per track is becoming narrower, and in order to guarantee interchangeability between VTRs, the magnetic tape is more precisely than ever. It has become an important factor to ensure the rectilinearity of a recording / reproducing pattern recorded on a recording medium.

A conventional recording track straightness adjusting device for ensuring the recording / playback straightness of a magnetic recording / reproducing apparatus will be described below.

FIG. 7 is a plan view of a tape drive used in a magnetic recording / reproducing apparatus. In FIG. 7, 1 is a capstan that is driven to rotate, 8 is a magnetic tape used for recording and reproduction, 11 is a regulating post, 12 is a pinch arm holding a pinch roller 18 at its tip, and 13 is rotation of the pinch arm 12 A pinch arm support, which is a shaft, 15 is a rotary cylinder, and 16 and 17 are guide rollers for guiding the magnetic tape 8 to be wound around the rotary cylinder 15.
Reference numeral 8 denotes a pinch roller for transferring the capstan 1 by holding the magnetic tape 8 therebetween.

In the magnetic recording / reproducing apparatus as described above,
To ensure that the magnetic tapes recorded for each device can be reproduced from each other, the shape of the recording pattern for the magnetic tape, which is predetermined in order to ensure so-called compatible reproduction, is determined for each format of each recording system. Among the formats of the recording pattern, the straightness of the recording pattern is important for ensuring the compatible reproduction.

The operation of the conventional recording track straightness adjusting device configured as described above will be described below with reference to FIG.

The format of the recording pattern is 8b in FIG.
It is assumed that the vehicle is truly straight, as indicated by the wavy line shown in FIG. At this time, if the recording pattern is bent with respect to the format as shown in 8a, the reproduced envelope signal by the magnetic head 15b does not become flat as shown by a solid line 9a in FIG. 9, for example. For this reason, when the rectilinearity error of the recording pattern exceeds a certain limit, a problem such as generation of noise or the like on the reproduction screen occurs. Originally, the recording pattern is 8b
, The reproduced envelope signal becomes flat as shown at 9b in FIG. 9, and such a problem does not occur. Therefore, in a normal magnetic recording / reproducing device, the magnetic head 15b of each magnetic recording / reproducing device can record / reproduce a recording pattern according to a format so as not to cause a problem such as screen noise due to compatible reproduction as described above.
A so-called recording track straightness adjustment for adjusting a state in which the magnetic tape 8 runs on the lead 15b of the rotary cylinder 15 is performed. An example of the recording track straightness adjustment method will be described below.

First, a straightness adjusting standard tape 8 used for recording track straightness adjustment is prepared. As shown in 8b of FIG. 8, recording is performed on the straightness adjusting standard tape 8 so that the straightness is as good as possible. Attention will be paid to a reproduction signal when such a straightness adjusting standard tape 8 is reproduced by a magnetic recording / reproducing apparatus for which recording track straightness is to be adjusted.

At this time, the reproduced envelope signal is 9b in FIG.
If the guide rollers 16 and 17 are adjusted up and down in the L or M direction or the N or O direction in FIG. 8 so that the magnetic head 15b is flat, the magnetic head 15b can run on the recording pattern 8b correctly. It is considered that the recording track straightness was adjusted.

That is, the magnetic head 15b shown in FIG. 8 can perform recording / reproducing while ensuring the recording pattern straightness according to the format. Thereby, the magnetic recording and reproducing apparatus can realize compatible recording and reproducing.

However, there is a problem if the recording track straightness adjustment for ensuring the straightness is performed with higher accuracy than the recording track straightness adjustment procedure described above.
That is, in the recording track straightness adjustment procedure,
It has been described that the recording is performed so that the straightness is as good as possible, and the straightness adjusting standard tape 8 is prepared. However, it is difficult to make the error free from the ideal value.
Therefore, in the magnetic recording / reproducing apparatus which attempts to adjust the recording track rectilinearity, at least the linearity error of the standard tape 8 for linearity adjustment is adjusted with the linearity error with respect to the format. May be lost. Therefore, the straightness adjusting standard tape 8
However, there is a problem that the accuracy of the linearity of the magnetic recording / reproducing apparatus varies due to the variation in the manufacturing accuracy of the magnetic recording / reproducing apparatus.

Therefore, it has been considered that the straightness error of the straightness adjusting standard tape 8 is corrected to perform the straightness adjustment of the recording track.

First, a description will be given with reference to the block diagram of FIG. The straightness adjusting standard tape 8 is developed by the straightness adjusting magnetic tape developing unit 131, and the straightness is measured by the straightness measuring unit 132 from the pattern. The straightness data measured by the straightness measurement unit 132 is stored in the storage unit 133 as straightness data of the straightness adjustment standard tape 8.

Next, a description will be given with reference to the block diagram of FIG. It is assumed that there is a magnetic recording / reproducing apparatus for which straightness is to be adjusted. The magnetic recording / reproducing device 142 reproduces the straightness adjusting standard tape 8, and the straightness during reproduction is measured by the first straightness measuring unit 143. First straightness measuring unit 14
The storage unit 14 previously obtained from the straightness data measured in Step 3
When the rectilinearity data stored in 4 is subtracted by the rectilinearity eliminating section 145, the rectilinearity error of the rectilinearity adjusting magnetic tape 8 itself is eliminated, and the second rectilinearity measuring section 146 attempts to adjust the rectilinearity. The linearity of only the magnetic recording / reproducing device 142 to be measured can be measured. Therefore, it is possible to perform the recording track straightness adjustment of the straightness adjustment by moving the guide rollers 16 and 17 of FIG. 8 up and down so that the straightness of the magnetic recording / reproducing apparatus itself goes straight.

The above procedure will be described again with reference to FIG. 10 from the flow of straightness data. The straightness error of the straightness adjusting standard tape 8 is measured by the straightness measuring unit as described above. It is assumed that this shape has a shape like g in FIG. When this straight tape for adjusting rectilinearity 8 is reproduced by a magnetic recording / reproducing apparatus which attempts to adjust the rectilinearity of a recording track, the bent portion of the detected waveform of the envelope signal is displayed as shown by h in FIG. 10B. And

By subtracting the straightness error g of the straightness adjusting standard tape 8 previously obtained from the curve h of the detected waveform of the envelope signal, the straightness adjustment of the recording track is performed as shown in FIG. The rectilinearity of the recording / reproducing track of the magnetic recording / reproducing apparatus to be performed can be displayed without the influence of the rectilinearity error of the straightness adjusting standard tape 8 itself. Here, if the recording track rectilinearity adjustment is performed on the waveform (hg) of FIG. 10C so that the wave line becomes flat, the recording / reproducing pattern of the magnetic recording / reproducing apparatus that performs the recording track rectilinearity adjustment will go straight. The performance can be adjusted more accurately without including the straightness error of the straightness adjusting standard tape 8.

[0017]

However, in the above-described conventional recording track straightness adjusting device, the tape width of the straightness adjusting standard tape 8 has a certain allowable width centered on the reference width determined by the format. This variation in tape width has an adverse effect on the recording track straightness adjustment accuracy, and there is a problem that causes the recording track straightness adjustment accuracy to deteriorate. The problem will be described below.

As shown in FIG. 1, it is assumed that the width of the straightness adjusting standard tape 8 is a reference value W1 determined by the format, and in this state, the recording track straightness is adjusted as shown in FIG. . In this magnetic recording / reproducing apparatus in which the recording track rectilinearity is adjusted, when recording is performed on the magnetic tape 8 having the same tape width W1 as that of the standard tape 8 for linearity adjustment, the running state is as shown in FIG. When the tape travels the same way as when it travels, the tape pattern becomes substantially straight as shown in FIG.

Here, as described above, the reference tape width W1
In the magnetic recording / reproducing apparatus in which the recording track rectilinearity is adjusted by the standard linearity adjusting tape 8 described above, recording is performed using a magnetic tape having a width W2 wider than the reference W1. In this case, the magnetic tape 8 is sandwiched between the guide rollers 16 and 17 and the lead 15a of the rotary cylinder 15. That is, A and B in FIG.
, The magnetic tape 8 is deformed, and the recording pattern of the magnetic tape 8 having the width of W2 is as shown in FIG.
As shown by G and H in FIG. 5, the light beam is bent with respect to the format reference straight line, and has an error in straightness.

Conversely, in a magnetic recording / reproducing apparatus in which the recording track straightness is adjusted by the straightness adjusting standard tape 8a having the reference tape width W1, recording is performed using a width W3 smaller than the reference W1. . In this case, the magnetic tape 8
Are the guide rollers 16 and 17 and the rotating cylinder 15
The vehicle travels with a gap between itself and the lead portion 15a. That is, in the vicinity of C and D in FIG. 3, the magnetic tape 8 runs away from the lead portion 15a of the rotary cylinder 15, and the recording pattern of the magnetic tape 8 having a width of W3 is represented by I and J in FIG. As described above, the curved line is bent with respect to the format reference straight line, and there is an error in the straightness. At this time, attention should be paid to the case where the width of the magnetic tape 8 is wider and narrower than the width of the magnetic tape 8 on which the recording track straightness adjustment has been performed. As can be seen from FIGS. The point of holding is opposite. Therefore, considering that tapes of various widths exist within the allowable range, in order to minimize the linearity error with respect to the straight line of the format, it is necessary to use the standard linearity adjustment tape 8.
Can be considered as long as it is the center of the allowable tape width, that is, the reference value W1. However, there is a problem that it is difficult to always prepare a tape having a width almost close to the reference value for the straightness adjusting standard tape 8 due to the production accuracy of the magnetic tape.

The present invention has been made in view of the above-mentioned conventional problems, and the recording track rectilinearity of the magnetic recording / reproducing apparatus can be accurately determined regardless of the tape width for adjusting the recording / reproducing rectilinearity of any tape width within the allowable range of the format. It is an object of the present invention to provide a recording track straightness adjusting device capable of performing adjustment.

[0022]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a recorded linearity adjusting magnetic tape used for adjusting the recording track linearity of a magnetic recording / reproducing apparatus.
First rectilinearity measuring means for measuring rectilinearity of a recording track; and tape width difference rectilinearity error detection for detecting a rectilinearity error due to a tape width difference from a width difference of the linearity adjusting magnetic tape width from a reference tape width. Means, storage means for storing the rectilinearity error of the magnetic tape for adjusting rectilinearity, and second rectilinearity measuring means for measuring the rectilinearity of the recording track of the recorded magnetic tape while reproducing the recorded magnetic tape. It is provided with.

Also, the straightness of the straightness adjusting magnetic tape is measured by using a straightness measuring means, and the tape width of the straightness adjusting magnetic tape is measured to obtain a width difference from a standard value of the format. The linearity error due to the difference in tape width from the reference width is detected by the tape width difference linearity error detection means from the difference, and the linearity data and the tape width difference of the magnetic tape for linearity adjustment obtained by the linearity measurement means are detected. The result obtained by adding the linearity data based on the width difference with respect to the reference width of the tape width obtained by the linearity error detection means is stored in the storage means, and the recording track is adjusted when performing the recording track linearity adjustment in another magnetic recording / reproducing apparatus. While running the magnetic tape for straightness adjustment with the magnetic recording / reproducing device for straightness adjustment, the straightness of the recording track is measured with the straightness measuring device, and the data in the storage means is obtained from the measurement result. Performs recording track linearity adjustment without influence of straightness error of the magnetic tape itself for straightness adjusted by to draw.

With such a configuration, it is possible to accurately adjust the recording track rectilinearity of the magnetic recording / reproducing apparatus regardless of the tape width for adjusting the recording / reproducing rectilinearity within any allowable range of the format. It is an object of the present invention to provide a recording track straightness adjusting device capable of performing the following.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a recorded linearity adjusting magnetic tape used for adjusting a recording track rectilinearity of a magnetic recording / reproducing apparatus, and a recording track rectilinearity are measured. First straightness measuring means, tape width difference straightness error detecting means for detecting a straightness error due to a tape width difference from a width difference of the straightness adjustment magnetic tape width from a reference tape width, and the straightness adjustment Storage means for storing the rectilinearity error of the magnetic tape for use, and second rectilinearity measuring means for measuring the rectilinearity of the recording track of the recorded magnetic tape while reproducing the recorded magnetic tape; and With this configuration, the recording / reproduction linearity of any tape width within the allowable range of the format can be adjusted without specially selecting the tape width as a magnetic tape for recording / reproduction linearity adjustment as in the past. Be used for adjusting the magnetic tape, it is possible to perform recording track linearity adjustment accuracy magnetic recording and reproducing apparatus.

Further, the straightness of the straightness adjusting magnetic tape is measured using straightness measuring means, and the tape width of the straightness adjusting magnetic tape is measured to obtain a width difference from a reference value of the format. The linearity error due to the difference in tape width from the reference width is detected by the tape width difference linearity error detection means from the difference, and the linearity data and the tape width difference of the magnetic tape for linearity adjustment obtained by the linearity measurement means are detected. The result obtained by adding the linearity data based on the width difference with respect to the reference width of the tape width obtained by the linearity error detection means is stored in the storage means, and the recording track is adjusted when performing the recording track linearity adjustment in another magnetic recording / reproducing apparatus. While running the magnetic tape for straightness adjustment with the magnetic recording / reproducing device for straightness adjustment, the straightness of the recording track is measured with the straightness measuring device, and the data in the storage means is obtained from the measurement result. The tape is used to adjust the recording track straightness without being affected by the straightness error of the straightness adjusting magnetic tape itself, and the tape width is specially selected as a conventional magnetic tape for recording and reproduction straightness adjustment. Without doing this, it is possible to accurately adjust the recording track rectilinearity of the magnetic recording / reproducing apparatus regardless of the tape width for adjusting the recording / reproducing rectilinearity with any tape width within the allowable range of the format.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 7 is a plan view of a tape drive used in a magnetic recording / reproducing apparatus. In FIG.
1 is a capstan that is driven to rotate, 8 is a magnetic tape used for recording and reproduction, 11 is a regulation post, 12 is a pinch arm holding a pinch roller 18 at its tip, 13 is a pinch arm 12 pinch arm support, and 15 is a rotation. Cylinders, 16 and 17 are guide rollers, and 18 is a pinch roller for transferring the capstan 1 and the magnetic tape 8 by sandwiching them.

Hereinafter, a method for adjusting the recording track straightness in the magnetic recording / reproducing apparatus as shown in FIG. 7 will be described.

This will be described with reference to the block diagram of FIG. The rectilinearity adjusting magnetic tape 8 is developed by the tape developing unit 121, and the rectilinearity of the recording pattern is measured by the rectilinearity measuring unit 122. Next, the tape width of the linearity adjusting magnetic tape 8 is measured by the tape width measuring unit 123. Here, a tape width difference straightness error detecting means for detecting a straightness error due to a tape width difference will be described.

As described above with reference to FIGS.
When the magnetic tape width is changed from the standard tape width W1 to the wide W2 or the narrow W3, the straightness of the recording pattern is changed as shown in FIGS.
It has an error like It has been experimentally confirmed that the straightness error due to the tape width difference has a correlation with the magnitude of the error with respect to the tape width standard. This is shown in FIG.
This will be described with reference to the schematic diagram of FIG.

When the width of the magnetic tape is W2c>W2b> W2a
When>W1>W3a>W3b> W3c, the linearity error with respect to the tape width error is measured as shown in FIG. The data of the straightness error due to the tape width difference is prepared within a range of a conceivable allowable width. By taking out two pieces of rectilinearity error data in the case where the tape width is wider and narrower than the tape width of the rectilinearity adjusting magnetic tape determined above from the data of the straightness error, and complementing the two data. , Calculating and setting the straightness error data due to the tape width difference.

As described above, the straightness error data obtained by the tape width difference straightness error detecting section 124 for detecting the straightness error due to the tape width difference, and the straightness adjusting tape obtained by the straightness measuring section 122. The result obtained by adding the linearity error of the linear tape to the linearity adjustment magnetic tape 8 is stored in the storage unit 126 as the linearity error data of the magnetic tape 8 for linearity adjustment.

Next, a description will be given with reference to the block diagram of FIG. It is assumed that there is a magnetic recording / reproducing apparatus for which straightness is to be adjusted. The magnetic recording / reproducing device 142 reproduces the straightness adjusting standard tape 8, and the straightness during reproduction is measured by the first straightness measuring unit 143. First straightness measuring unit 14
The storage unit 14 previously obtained from the straightness data measured in Step 3
When the rectilinearity data stored in 4 is subtracted by the rectilinearity eliminating section 145, the rectilinearity error of the rectilinearity adjusting magnetic tape 8 itself is eliminated, and the second rectilinearity measuring section 146 attempts to adjust the rectilinearity. The linearity of only the magnetic recording / reproducing device 142 to be measured can be measured. Therefore, the guide rollers 16 and 17 shown in FIG. 8 can be moved up and down so that the straightness of the magnetic recording / reproducing apparatus itself goes straight, so that the recording track straightness adjustment of straightness adjustment can be performed.

The above operation will be described again with reference to FIGS. 10 and 11 from the flow of the straightness data. As described above, the straightness error of the straightness adjusting standard tape 8 is measured by the straightness measurement unit as described above. This shape is shown in FIG.
It is assumed that it has a shape like g in (a). When this standard tape 8 for adjusting rectilinearity is reproduced by a magnetic recording / reproducing apparatus which attempts to adjust the rectilinearity of a recording track, the bent portion of the detected waveform of the envelope signal is displayed as h in FIG. 10B. And

By subtracting the straightness error g of the straightness adjusting standard tape 8 obtained earlier from the bending h of the detected waveform of the envelope signal, the recording of the magnetic recording / reproducing apparatus for performing the straightness adjustment of the recording track is performed. The rectilinearity of the reproduction track can be displayed without the influence of the rectilinearity error of the straightness adjusting standard tape 8 itself. Here, FIG.
The linearity of the recording / reproducing pattern of the magnetic recording / reproducing apparatus which performs the recording track linearity adjustment by making the recording track linearity adjustment flat as shown by the wavy line in FIG. The adjustment can be performed with higher accuracy without including the straightness error of the adjustment standard tape 8.

What is important here is the case where the width of the straightness adjusting tape 8 is not the reference value W1, but is wide W2 and narrow W3. For example, in the case of a wide W2, in a normal case, the recording track straightness adjustment is performed so that the wide W2 has the least deformation on the tape as shown in FIG. Accordingly, in the mechanism adjusted by the wide width W2 as compared with the case where the recording track rectilinearity is adjusted by the reference width W1, when the tape of the narrow width W3 runs, C
In addition, the gap becomes larger in the portions D and D, and the straightness error increases. Therefore, when performing the recording track straightness adjustment with the wide tape W3, it is necessary to lower the guide rollers 16 and 17 in FIG. 1 in order to minimize the straightness error when the reference width W1 runs. . However, according to the recording track rectilinearity adjustment procedure of the present embodiment, as described above, when the magnetic tape for linearity adjustment is wide W3, the linearity error increase due to the wideness, that is, FIG. The straightness errors of the G and H portions of No. 5 are also added to the storage unit as errors of the straightness adjusting tape. Therefore, at the time of the recording track straightness adjustment shown in FIG. 14, the straightness error due to the straightness error and the tape width error of the straightness adjusting tape is corrected, and the recording track straightness adjustment is performed.

As a result, even when the straightness adjusting tape having the wide width W3 is used, the straightness adjustment of the recording track can be performed in the same manner as when the adjustment is performed using the straightness adjusting tape having the reference width W1. The same applies when the width of the straightness adjusting tape is small.

As described above, according to the present embodiment, the recording track straightness adjustment state of the inspection mechanism is based on the reference width W.
It can be adjusted so that the straightness is the best for one tape.

[0039]

As described above, according to the present invention, when adjusting the rectilinearity of a recording / reproducing pattern of a magnetic recording / reproducing apparatus,
Even if the tape width of the straightness adjustment magnetic tape itself is wider and narrower than the reference value, the same adjustment as if the adjustment was performed using the straightness adjustment magnetic tape with the reference tape width was performed. It becomes possible. As described above, the magnetic recording / reproducing apparatus in which the recording track rectilinearity is adjusted by the recording track linearity adjusting means of the present invention can adjust the recording track rectilinearity to a state where the rectilinearity error is minimized with respect to variations in the tape width for recording and reproducing. This has the effect of being performed.

Further, it is possible to adjust the magnetic recording / reproducing apparatus to a running state which is least affected by the tape width without strictly controlling the tape width of the linearity adjusting magnetic tape. There is an effect that is very advantageous in manufacturing a tape.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a running state of a straightness adjusting magnetic tape according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a running state of a wide magnetic tape in the embodiment.

FIG. 3 is a schematic diagram showing a running state of a narrow magnetic tape in the embodiment.

FIG. 4 is a schematic diagram showing a recording / reproducing pattern of the magnetic tape for adjusting rectilinearity in the embodiment.

FIG. 5 is a schematic diagram showing a recording / reproducing pattern of a wide magnetic tape in the embodiment.

FIG. 6 is a schematic diagram showing a recording / reproducing pattern of a narrow magnetic tape in the embodiment.

FIG. 7 is a plan view showing the configuration of a tape drive of the magnetic recording / reproducing apparatus.

FIG. 8 is a schematic diagram showing the state of a recording pattern during recording and reproduction.

FIG. 9 is a signal waveform diagram of a playback envelope during recording and playback.

FIG. 10 is a detection waveform diagram of a reproduction envelope signal.

FIG. 11 is a detection waveform diagram of a reproduced envelope signal.

FIG. 12 is a block diagram showing a configuration of a recording track straightness adjusting device according to an embodiment of the present invention;

FIG. 13 is a block diagram showing a configuration of a conventional recording track straightness adjusting device.

FIG. 14 is a block diagram of a recording track straightness adjusting device;

FIG. 15 is a schematic diagram showing a bent state of a recording / reproducing pattern of magnetic tapes having different widths.

[Explanation of symbols]

 8 Linearity Adjustment Magnetic Tape 121 Tape Developing Unit 122 Straightness Measurement Unit 123 Tape Width Measurement Unit 124 Tape Width Difference Straightness Error Detection Unit 125 Addition Unit 126 Storage Unit

Claims (2)

[Claims] 1. A recorded magnetic tape for adjusting rectilinearity used for adjusting the rectilinearity of a recording track of a magnetic recording / reproducing apparatus, a rectilinearity measuring means for measuring the rectilinearity of a recording track,
A tape width difference rectilinearity error detecting means for detecting a rectilinearity error due to a tape width difference from a width difference with respect to a reference tape width of the rectilinearity adjusting magnetic tape, and storing a rectilinearity error of the rectilinearity adjusting magnetic tape. A recording track rectilinearity adjusting device comprising: a storage means; and a rectilinearity measuring means for measuring rectilinearity of a recording track of the recorded magnetic tape while reproducing the recorded magnetic tape. 2. The linearity of the linearity adjusting magnetic tape is measured by using a linearity measuring means, and the tape width of the linearity adjusting magnetic tape is measured to obtain a width difference from a standard value of the format. The linearity error due to the difference in tape width from the reference width is detected by the tape width difference linearity error detection means from the difference, and the linearity data and the tape width difference of the magnetic tape for linearity adjustment obtained by the linearity measurement means are detected. The result obtained by adding the linearity data based on the width difference with respect to the reference width of the tape width obtained by the linearity error detection means is stored in the storage means, and the recording track is adjusted when performing the recording track linearity adjustment in another magnetic recording / reproducing apparatus. While the magnetic tape for straightness adjustment is running with the magnetic recording / reproducing device for straightness adjustment, the straightness of the recording track is measured with the straightness measuring device, and the data in the storage means is subtracted from the measurement result. A recording track straightness adjusting device for performing the recording track straightness adjustment without being affected by the straightness error of the straightness adjusting magnetic tape itself.