JPH10134328A - Recording track straightforwardness adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely perform straightforwardness adjustment even in an adjusting magnetic tape with any tape width within an allowable range of a format by measuring a recording track straightforwardness of a straightforwardness adjusting magnetic tape without an effect of a recording track straightforwardness error of a test mechanism. SOLUTION: A straightforwardness test mechanism 122 is adjusted so that the straightforwardness error becomes least at a reference tape width. The straightforwardness data measured by a first straightforwardness measurement part 125 using the reference tape width are stored in a first storage part 126 as the reference straightforwardness error data. Succeedingly, the straightforwardness adjusting magnetic tape 121 is reproduced by the test mechanism 122, and the straightforwardness error data are subtracted from the straightforwardness data 124 measured by a second straightforwardness measurement part 123 by a straightforwardness error removal part 127, and the straightforwardness error is removed. When the tape width is wider or narrower than the reference width, the straightforwardness error due to a difference of the tape width is added to the original straightforwardness error and stored in a second storage. part 128 as the error data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In recent years, tape recorders, camera-integrated VTRs, and the like have been required to be smaller and lighter and have higher image quality. Therefore, it is necessary to increase the recording density for 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 the recording / reproducing pattern recorded on the tape.

[0003] A recording track straightness adjusting device of a conventional 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 regulation post, and 12 is a pinch taper.
And 13 is a pinch which is a rotation axis of the pinch arm 12.
A column 15 is a rotary cylinder around which the magnetic tape 8 is wound to record and reproduce signals, 16 and 17 are guide rollers, and 18 is a taper together with the capstan 1 for holding the magnetic tape 8. Transferable pinch rollers
It is.

In the above-described conventional magnetic recording / reproducing apparatus, recording on a predetermined magnetic tape is performed so as to ensure so-called compatible reproduction so that a magnetic tape recorded by another apparatus can be reproduced. The shape of the pattern is determined for each recording format. Among the recording pattern formats, the straightness of the recording pattern is important for ensuring the compatible reproduction.

A description will be given with reference to FIG. Now, it is assumed that the format of the recording pattern is truly straight, as indicated by a broken line 8b in FIG. At this time, if the recording pattern is bent with respect to the format as shown in 8a, the reproduction envelope signal by the magnetic head 15b does not become flat as shown by a solid line 9a in FIG. For this reason, if the rectilinearity error of the recording pattern exceeds a certain limit, problems such as generation of noise on the reproduction screen occur.
If the recording pattern is originally recorded as shown by 8b, the reproduced envelope signal becomes flat as shown by 9b in FIG. 9 and such a problem does not occur. Therefore, in a normal magnetic recording / reproducing apparatus, the magnetic head 15b of each magnetic recording / reproducing apparatus can record / reproduce a recording pattern according to a format so as not to cause a problem such as screen noise due to the compatible reproduction as described above. Thus, the so-called recording track straightness adjustment for adjusting the state in which the magnetic tape 8 travels on the lead 15b of the cylinder 15 is performed.

The recording track straightness adjusting device will be described below. First, a straightness adjusting standard tape 8 used for adjusting the recording track straightness is prepared. As shown in 8b of FIG. 8, recording is performed on the standard tape 8 for straightness adjustment so that the straightness is as good as possible according to the format. Attention will be focused on a reproduced signal when such a straightness adjusting standard tape 8 is reproduced by a magnetic recording / reproducing apparatus which is going to adjust the recording track straightness.

At this time, the reproduced envelope signal is 9b in FIG.
If the guide rollers 16 and 17 are adjusted by moving the guide rollers 16 and 17 up and down in the L and M directions and the N and O directions in FIG. 8 so as to be flat, the magnetic head 15b correctly travels on the recording pattern 8b. It is considered that the recording track straightness was adjusted so that it could be performed.

In other words, the magnetic head 15b shown in FIG. 8 can perform recording and reproduction 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 recording is performed so that the straightness is as good as possible, and the standard tape 8 for straightness adjustment is prepared. However, it is difficult to make the error free from the ideal value.
Therefore, the magnetic recording / reproducing apparatus which attempts to adjust the recording track rectilinearity, requires at least the rectilinearity error of the straightness adjusting standard tape 8 to have a rectilinearity error with respect to the format. The sex may be adjusted. 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, such a standard tape for straightness adjustment is used.
It has been conceived that the straightness error of the recording track 8 is corrected and the straightness of the recording track is adjusted.

This will be described with reference to the block diagram of FIG. First, the straightness adjusting standard tape 8 is developed by the straightness adjusting magnetic tape developing unit 132, and the straightness is measured by the straightness measuring unit 133 from the pattern. Straightness measuring unit 133
The straightness data measured in Step 2 is transferred to a straightness adjustment standard tape 8
Is stored in the storage unit 134 as the straightness data.

The case where there is a magnetic recording / reproducing apparatus whose straightness is to be adjusted will be described with reference to the block diagram of FIG. The magnetic recording / reproducing device 142 reproduces the straightness adjusting standard tape 141, and the straightness during reproduction is measured by the first straightness measuring unit 143. From the rectilinearity data measured by the first rectilinearity measuring unit 143, the rectilinearity data stored in the second storage unit 144 previously obtained is subtracted by the rectilinearity eliminating unit 145 to obtain the linearity adjusting magnetic tape itself. Is eliminated, and the second straightness measuring section 146 can measure the straightness of only the magnetic recording / reproducing apparatus whose straightness is to be adjusted. 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 from the flow of straightness data with reference to FIG. FIG. 10 shows the waveform of the envelope signal of the standard tape for straightness adjustment.
The straightness error of the straightness adjusting standard tape 8 is measured by the straightness measuring means 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 straightness adjustment is reproduced by a magnetic recording / reproducing apparatus which attempts to adjust the straightness of the recording track, the bent portion of the detection waveform of the envelope signal becomes as shown in FIG. 10 (b). . The amount of curve h in the detection waveform of this envelope signal
By subtracting the straightness error g of the straightness adjustment standard tape 8 previously obtained from the above, the recording / reproducing track of the magnetic recording / reproducing apparatus for performing the recording track straightness adjustment as shown in FIG. Standard straightness 8 for straightness adjustment
The display can be performed excluding the influence of the straightness error of itself. Here, if the waveform of "hg" in FIG. 10C is adjusted so that the wavy line becomes flat, the recording track rectilinearity adjustment is performed by the magnetic recording / reproducing apparatus that performs the recording track rectilinearity adjustment. The straightness can be adjusted more accurately without including the straightness error of the straightness adjusting standard tape 8.

[0015]

However, in the above-mentioned conventional configuration, the tape width of the standard tape 8 for straightness adjustment has a predetermined allowable width centering on the reference width determined by the format. This variation in the tape width adversely affects the accuracy of the recording track straightness adjustment, and causes a problem that the accuracy of the recording track straightness adjustment is deteriorated. The problem will be described below.

A description will be given below with reference to FIGS. Now, 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. In this case, the tape travels in the same manner as when the tape 8 travels, and its tape pattern is substantially straight as shown in FIG.

Next, in the magnetic recording / reproducing apparatus in which the recording track rectilinearity is adjusted by the standard tape 8 for adjusting the rectilinearity of the reference tape width W1 as described above, as shown in FIG. It is assumed that recording is performed using a magnetic tape having a wider tape width W2. In this case, the magnetic tape 8
Are the guide rollers 16 and 17 and the rotating cylinder 15
In a state of being sandwiched between the lead portion 15a provided on the outer periphery of the device. That is, the magnetic tape 8 is deformed in the vicinity of A and B in FIG. 2, and the recording pattern of the magnetic tape 8 having the width of W2 is different from the format standard straight line as shown in G and H in FIG. And it has a straightness error.

Conversely, in the magnetic recording / reproducing apparatus in which the recording track rectilinearity is adjusted by the standard tape 8a for adjusting the rectilinearity of the reference tape width W1, as shown in FIG.
It is assumed that recording is performed using a magnetic tape having a tape width W3 smaller than 1. In this case, the magnetic tape 8 is formed by the guide rollers 16 and 17 and the lead 1 of the rotary cylinder 15.
The vehicle travels with a gap between the vehicle and the vehicle 5a. 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, it is bent with respect to the format reference straight line, and there is an error in the straightness.

At this time, depending on whether the width of the magnetic tape 8 is wider or narrower than the width of the magnetic tape 8 on which the recording track straightness adjustment has been performed, a direction having a straightness error as can be seen from FIGS. Is the opposite. Therefore, considering that there are tapes of various widths within the allowable range, in order to minimize the linearity error with respect to the straight line of the format, the width of the standard tape 8 for adjusting the linearity is set at the center of the allowable tape width. That is, it is considered that the reference value W1 is sufficient.
However, there is a problem in that it is difficult to always prepare a tape having a width almost close to the reference value for the standard tape 8 for adjusting the straightness, because of the production accuracy of the magnetic tape.

The present invention solves the above-mentioned problem, and it is possible to accurately adjust the recording track rectilinearity regardless of the tape width of the recording / reproducing linearity adjustment 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.

[0021]

In order to solve the above-mentioned problems, a recording track straightness adjusting device according to the present invention comprises a magnetic tape for straightness adjusting for recording track straightness of a magnetic recording / reproducing apparatus, and a recording track. A first straightness measuring means for measuring straightness; a first storage means for storing recording track straightness data measured by the first straightness measuring means; and a magnetic tape for straightness adjustment. Second rectilinearity measuring means for measuring the rectilinearity of the recording track of the recorded magnetic tape while reproducing, and second storage means for storing the rectilinearity data of the recording track measured by the second rectilinearity measuring means It is provided with.

Further, the rectilinearity of the recording track of the inspection mechanism is measured by the rectilinearity measuring means, and the result data is stored in the first track.
When the linearity adjusting magnetic tape is measured by the linearity measuring means while the linearity adjusting magnetic tape is reproduced by the inspection mechanism, the data stored in the first storage means is subtracted. The recording track straightness of the straightness adjusting magnetic tape itself is measured without the influence of the recording track straightness error of the inspection mechanism, and the recording track straightness data of the straightness adjusting magnetic tape itself is stored in the second storage means. When the recording is performed and the linearity of the recording track is adjusted by another magnetic recording / reproducing apparatus, the linearity of the recording track is measured by the linearity measuring apparatus while the magnetic tape for adjusting the linearity is run. By subtracting the data in the second storage means from the result, the recording track straightness adjustment can be performed without the influence of the straightness error of the straightness adjusting magnetic tape itself. It is.

According to the present invention, the recording / reproducing of any tape width within the allowable range of the format can be performed without specially selecting the width of the tape as the recording / reproducing linearity adjusting magnetic tape as in the conventional example. Even if the linearity adjusting magnetic tape is used, it is possible to accurately adjust the recording track linearity of the magnetic recording / reproducing apparatus.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention is directed to a magnetic tape for adjusting the rectilinearity of a recording track of a magnetic recording and reproducing apparatus, and a first tape for measuring the rectilinearity of a recording track. Straightness measuring means, first storage means for storing the recording track straightness data measured by the first straightness measuring means, and recorded magnetic tape while reproducing the straightness adjusting magnetic tape. A second straightness measuring means for measuring the straightness of the recording track of the loop, and a second storage means for storing the straightness data of the recording track measured by the second straightness measuring means. With such a configuration, the recording / reproduction linearity adjustment of any tape width within the allowable range of the format can be performed without specially selecting the tape width as the magnetic tape for recording / reproduction linearity adjustment as in the conventional example. Even using a magnetic tape, it is possible to perform recording track linearity adjustment accuracy magnetic recording and reproducing apparatus.

The recording track straightness adjusting device of the present invention will be described below 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. 7, 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 pin team, 13 is a pin team support, and 15 is a rotary cylinder. , 16 and 17 are guide rollers, and 18 is a pinch roller for holding and transporting the magnetic tape 8 together with the capstan 1.

Hereinafter, in the magnetic recording / reproducing apparatus as shown in FIG. 7, a configuration for performing the straightness adjustment of the recording track is shown in FIG.
2 will be described.

First, the straightness checking mechanism 122 is set. The rectilinearity inspection mechanism 122 has been previously adjusted for recording track rectilinearity by a conventional method.
This adjustment state is adjusted so as to minimize the straightness error at the reference tape width W1 as shown in FIGS. This is because the reference width W1, the wide width W2, and the narrow width W3
No. 1 tape is recorded, and the straightness of the developed pattern is
The measurement is performed by the straightness measuring unit 125 of FIG. The tape width W1 at the stage when the recording track straightness adjustment is completed.
The straightness data 126 measured by the straightness measurement unit 125 at
The straightness error data of the inspection mechanism shall be used.

Next, the rectilinearity adjusting magnetic tape 121 is reproduced by the rectilinearity inspection mechanism 122, and the rectilinearity is measured using the second rectilinearity measuring unit 123. From the straightness data 124 measured by the straightness measurement unit 123, the straightness data 126 by the first straightness measurement unit 125 of the straightness inspection mechanism 122 stored in the first storage unit 126 is converted to the straightness error elimination unit 127. , The straightness error of the straightness inspection mechanism 122 can be eliminated, and straightness error data of only the straightness adjusting tape 121 can be obtained. At this time, if the tape width of this straightness adjusting tape is wider W2 and narrower W3 than the reference W1, a straightness error due to the difference in tape width occurs as shown in FIGS. 5 and 6, This error is added to the original straightness error of the straightness adjustment tape and stored in the second storage unit 128 as straightness error data.

This will be described with reference to FIG. If there is a magnetic recording / reproducing apparatus 144 whose straightness is to be adjusted, the magnetic recording / reproducing apparatus 144 uses the standard tape 141 for straightness adjustment.
Is reproduced, and the rectilinearity at the time of reproduction is measured by the first rectilinearity measuring unit 14.
Measure at 3. When the rectilinearity data stored in the second storage unit previously obtained is subtracted by the rectilinearity rejection unit 145 from the rectilinearity data measured by the first rectilinearity measuring unit 143, the linearity adjusting magnetic tape itself is subtracted. Since the straightness error is eliminated, the straightness of only the magnetic recording / reproducing device 142 whose straightness is to be adjusted can be measured by the second straightness measuring unit 146. Therefore, the guide roller 16 shown in FIG.
And 17 are moved up and down to adjust the recording track straightness
7, the recording track straightness adjustment of the straightness adjustment can be performed.

The above procedure will be described again with reference to FIGS. 10 and 11 from the flow of straightness data.

In the above description, the straightness adjustment state of the inspection mechanism is such that the straightness of the recording track is adjusted with the smallest straightness error at the reference tape width W1. At this time, the straightness of the developed recording pattern measured by the straightness measuring unit when the reference tape width W1 is recorded by the inspection mechanism is defined as i. Therefore, since “i + ia” obtained by adding the inverted shape ia to the inverted shape i becomes flat like a broken line, it is possible to eliminate the influence of the linearity error of the inspection mechanism itself. This inverted shape ia is stored in the first storage unit.

Next, when the straightness is measured while running the straightness adjusting standard tape 8 in the inspection mechanism, the inverted shape ia of the straightness error of the inspection mechanism itself stored in the first storage unit is stored. By the addition, the straightness of the straightness adjusting standard tape 8 itself can be measured. It is assumed that this shape has a shape like g. The straightness data of g is stored in the second storage unit.

Next, a case of adjusting the rectilinearity of a recording track of a magnetic recording / reproducing apparatus will be described with reference to FIG. When this standard tape 8 for adjusting straightness is reproduced by a magnetic recording / reproducing apparatus for adjusting straightness of a recording track, the bent portion of the detected waveform of the envelope signal is shown in FIG.
It is assumed that the image is displayed as h in (b).

By subtracting the straightness error g of the straightness adjustment standard tape 8 previously obtained shown in FIG. 10A from the curvature h of the detected waveform of the envelope signal, the straightness of the recording track can be adjusted. The linearity of the recording / reproducing track of the magnetic recording / reproducing apparatus in which the recording / reproducing operation is to be performed can be displayed excluding the effect of the linearity error of the standard linearity adjusting tape 8 itself. Here, if the recording track rectilinearity adjustment is performed so that the waveform of “hg” in FIG. 10C becomes flat, the rectilinearity of the recording / reproducing pattern of the magnetic recording / reproducing apparatus that performs the recording track rectilinearity adjustment is improved. The straightness adjustment standard tape 8 can be adjusted more accurately without including the straightness error.

What is important here is the case where the width of the straightness adjusting tape 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. Therefore, in the mechanism adjusted by the wide width W2 as compared with the case where the recording track straightness is adjusted by the reference width W1, when the tape of the narrow width W3 runs,
The gap becomes larger in the C and D portions, 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 adjusting procedure of the present invention, as described above, when the linearity adjusting magnetic tape is a wide W3, an increase in the linearity error due to the widening,
That is, the rectilinearity errors of the G and H portions in FIG. 5 are also added to the second storage unit as errors of the rectilinearity 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 is true for W2 where the width of the straightness adjusting tape is narrow.

As described above, according to this embodiment, the recording track rectilinearity adjustment state of the magnetic recording / reproducing apparatus is adjusted so that the rectilinearity of the tape having the reference width W1 is the best. .

[0039]

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

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 of a magnetic tape after straightness adjustment 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 tape pattern of a magnetic tape on which straightness has been adjusted.

FIG. 5 is a schematic view showing a tape pattern of a wide magnetic tape.

FIG. 6 is a schematic view showing a tape pattern of a narrow magnetic tape.

FIG. 7 is a plan view of a tape driving device in the magnetic recording / reproducing device.

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

FIG. 9 is a signal waveform diagram of a reproduction envelope.

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 the present embodiment;

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

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

[Explanation of symbols]

 121 Magnetic tape for straightness adjustment 123 Second straightness measurement unit 125 First straightness measurement unit 126 First storage unit 127 Straightness error elimination unit 128 Second storage unit

Claims (2)

[Claims] 1. A magnetic tape for adjusting rectilinearity of a recording track of a magnetic recording / reproducing apparatus, a first rectilinearity measuring means for measuring a rectilinearity of a recording track, and the first rectilinearity measurement Means for storing the recording track rectilinearity data measured by the means, and second rectilinearity for measuring the recording track rectilinearity of the recorded magnetic tape while reproducing the rectilinearity adjusting magnetic tape. A recording track straightness adjusting device comprising: a recording track straightness data measured by the second straightness measuring means. 2. The linearity of a recording track of an inspection mechanism is measured by a linearity measuring means, and the data is stored in a first storage means. The data stored in the first storage means is subtracted when the linearity of the recording track is measured by the property measuring means, so that the recording of the magnetic tape for linearity adjustment itself is not affected by the recording track linearity error of the inspection mechanism. The track rectilinearity is measured, the recording track rectilinearity data of the magnetic tape for adjusting rectilinearity itself is stored in the second storage means, and when the rectilinearity of the recording track is adjusted by another magnetic recording / reproducing device, the rectilinearity of the track is measured. The linearity of the recording track is measured by the linearity measuring device while running the magnetic tape for adjusting the performance, and the data in the second storage means is inserted from the measurement result. A recording track rectilinearity adjusting device which performs recording track rectilinearity adjustment without being affected by a rectilinearity error of the rectilinearity adjusting magnetic tape itself.