JPH07240003A - Digital magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To suppress the occurrence of a read error in the data and running unstability and to prevent the deterioration in a tape at the time of high speed search and high speed reproduction by making a tape winding angle to a rotary drum smaller than that at the time of usual recording/reproducing. CONSTITUTION:An oblique guide pin 17c is fixed to a base 17a, and the base 17a is engaged with roller guide units 15, 18 freely rotatably around a pin 17b, and similar oblique guides 16, 17 are constituted. The turning tip part of the base 17a is energized at a usual recording/reproducing position by a spring 17e, and is turned in the direction of the arrow by a hook 17d against the energizing. The hook 17d and the rotary drum 2 are driven by first and second drive means, and the guides 16, 17 are moved in the direction of receding from the drum 2, and the drum 2 is moved in the direction shown by a broken line. Thus, the winding angle of the vapor deposited tape 1 to the drum 2 is reduced to that from a usual position to high speed search and high speed reproduction, and the occurrence of the read error in the data is reduced, and the deterioration and the running unstability in the tape 1 are suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus using a rotary drum, and more particularly to a digital magnetic recording / reproducing apparatus for recording / reproducing a digital signal.

[0002]

2. Description of the Related Art Currently, a typical DAT (digital audio recording device) for consumer use is a digital audio recording device.
There is a tape recorder). One of the features of this DAT is a high-speed search function that can find the beginning of a song in a short time. In this high-speed search, the tape is run at a speed as high as about 200 times that during normal reproduction. Further, since the tape used in this DAT is a coating type metal medium, deterioration of the tape does not become a big problem even if the tape is operated at such a high speed.

By the way, in recent years, digitalization has advanced in the world of images, and research on consumer digital VTRs has become active. In this system, the current analog VT
Higher density than R, recording density 1.4 μm ²
/ Bit has been achieved. With such a high recording density, it is difficult to achieve high-density recording with conventionally used coating type metal tapes, and it is essential to use a vapor deposition tape (ME tape) that can achieve higher-density recording.

However, the vapor-deposited tape has a drawback that its durability is remarkably inferior to that of the coating type tape because the metal magnetic material occupies most of its volume due to its constitution. In order to improve this durability, the vapor deposition tape used for a high-eight VTR (high-bandwidth 8 mm VTR) that records an analog image signal is also coated with various lubricants on the surface of the magnetic layer.

Further, the metal tape improved for high-density recording also has improved surface smoothness and therefore has poor durability like the vapor deposition tape.

The digital VTR is equipped with a high-speed search function similar to that of DAT in order to bring out a characteristic which the analog VTR does not have.
The high-speed search is performed at a tape speed of 200 times that is almost the same as the above.

Conventionally, as one method of preventing damage to the tape during high-speed search, a method of suppressing damage to the tape during braking has been proposed. this is,
When the tape reaches the vicinity of the end portion, the search speed is reduced by about 100 times, the minute rotation of the tape loading motor is detected, and the brake is instantaneously actuated so that the tape is not overloaded. .

Further, conventionally, in order to achieve the stabilization of the load applied to the vapor deposition tape, the guide pin is moved to control the tape tension at a constant level, and the rotating roller is frequently used to reduce the fluctuation of the running load. A deck mechanism technology for recording / reproducing has been proposed (1992, IEICE Magnetic Recording Study Group material, MR92-43).

Further, conventionally, there has been proposed a method of preventing deterioration of image quality during high-speed reproduction and making an image easy to see. For example, Japanese Patent Application Laid-Open No. 4-86195 discloses a configuration for reproducing a faithful color image during high speed reproduction. This is because when the pixel data on the screen is divided into a plurality of rectangular units, and one rectangular unit is composed of a luminance signal and a color difference signal and the pixel order is rearranged by shuffling and recorded, the same position is displayed on the screen. The rectangular units of a certain luminance signal and color difference signal are rearranged so as to be included in the same block on the recording medium. As a result, during high-speed playback,
Since the luminance signal and the color difference signal at the same position on the screen are always reproduced at the same time, a faithful color image is reproduced.

[0010]

Even during high-speed search and high-speed reproduction, the magnetic tape is wound around the rotary drum in the same manner as in normal reproduction in order to read information recorded on the magnetic tape. However, when the vapor deposition tape is wound around the rotating drum at high speed, the lubricant on the surface of the vapor depositing tape is gradually scraped off. As a result, the scraped lubricant adheres to the surface of the rotary drum, or The magnetic layer itself may be damaged, resulting in deterioration of the reproduced signal and increase of errors.

Further, a double coating metal coating medium (trade name ATO) in which a metal magnetic layer and a non-magnetic layer are combined.
Since the surface smoothness of the coating type metal medium improved for high density recording (MM) is also improved, the tape sticks to the rotating drum and the running becomes unstable during high speed search and high speed reproduction. There is.

As described above, conventionally, a method for suppressing the damage of the tape during braking and a technique for controlling the tape tension at the time of normal reproduction have been proposed. DA as the coating medium
There is no mention of a solution for suppressing the deterioration of these magnetic tapes when performing a high speed search at a speed similar to T, and the problems in the high speed search and high speed reproduction operation of these tapes remain. It was.

Further, in the apparatus for faithfully reproducing a color image at the time of high speed reproduction according to the above-mentioned publication, the image is reproduced by devising rearrangement at the time of shuffling so that the luminance signal and the color difference signal coincide with each other in time and position. However, the problem of deterioration of these tapes during high-speed search and high-speed reproduction has not been solved.

Therefore, the present invention provides a digital magnetic recording / reproducing apparatus capable of reducing the occurrence of a data reading error and suppressing the deterioration of the vapor deposition tape when performing a high speed search using the vapor deposition tape. The purpose is to

Further, according to the present invention, the durability of the vapor deposition tape and the improved metal coated medium can be improved to ensure running stability, and the deterioration of image quality during high speed reproduction can be suppressed.
It is another object of the present invention to provide a digital magnetic recording / reproducing device that ensures operation during high-speed search.

[0016]

In order to achieve the above object, the digital magnetic recording / reproducing apparatus of the present invention, in the first aspect (corresponding to claim 1), repeats the above high speed search a number of times. Also, in order to prevent the reproduction signal from deteriorating and the error from increasing, a wrapping angle changing means for reducing the wrapping angle of the vapor deposition tape around the rotary drum is provided at the time of high speed search.

Furthermore, the present invention provides a second aspect (claim 2).
In order to avoid image quality deterioration, the tape winding angle on the rotary drum should be adjusted so that at least the video area of the information recorded on the vapor deposition tape can be played during high-speed playback (variable speed playback). And a winding angle changing means for changing

Further, according to the present invention, in the third aspect (corresponding to claim 4), during the high speed search, at least the information of the subcode area among the information recorded on the vapor deposition tape is reproduced to the rotary drum. And a means for changing the number of rotations of the rotary drum to a predetermined value so that the relative speed between the tape and the head becomes substantially the same as that during normal reproduction.

In order to reduce the winding angle of the vapor deposition tape around the cylinder, it is preferable that the tilt guide is rotatably provided and that the first drive means is provided for rotating the tilt guide in the direction away from the rotary drum. Also,
In order to reduce the winding angle, it is preferable to include a second driving unit that moves the pedestal holding the rotating drum rotatably in a direction away from the vapor deposition tape. Further, in order to reduce the winding angle, it is preferable that the tilt guide and the roller guide unit are configured to return from the tape mounting completion position to a predetermined position by the tape loading mechanism.

[0020]

According to the first aspect of the present invention, the deterioration of the vapor deposition tape and the improved metal coated tape can be suppressed by providing the winding angle changing means for reducing the winding angle of the tape during the high speed search.

According to the second and third aspects of the present invention, the tape winding angle is minimized during high speed reproduction or high speed search. As a result, deterioration of the tape and running instability can be suppressed, and necessary and sufficient data for image retrieval can be reproduced.

In the helical scanning mechanism, the scanning locus of the rotary magnetic head on the tape changes depending on the speed and direction of the tape and the head. Therefore,
The effective tape scanning speed of a rotating magnetic head is represented by the relative speed between the tape and the head. Then, this relative speed is determined by vector-wise composition of the running speed of the tape and the rotating speed of the magnetic head. In the third aspect of the present invention, the rotational speed of the rotary drum is lowered during high-speed search, and the relative speed between the tape and the head is made approximately the same as during normal reproduction. As a result, the reproduction signal wavelength detected by the reproduction head can be prevented from being shortened, and a high reproduction output can be obtained.

FIG. 1 is a schematic skeleton diagram of the basic construction provided with the winding angle changing means in the present invention. As a first aspect of the wrapping angle changing means, the rotatable tilt guides 16 and 17 are used for high speed reproduction or high speed search.
By the first drive means 26 in the figure, the tape is rotated in a direction to reduce the winding angle of the tape around the cylinder.

As a second aspect, during high-speed reproduction or high-speed search, the pedestal holding the rotating drum 2 rotatably rotates the tape around the cylinder by the operation of the second drive means 27. Is moved in the direction of decreasing. Further, as a third aspect, during the high speed reproduction or the high speed search, the operation of the tape loading mechanism 25 causes
By returning the tilt guide and roller guide units 15 and 18 from the tape mounting completion position to a predetermined position,
The winding angle of the tape around the cylinder can be reduced.

[0025]

EXAMPLES Examples of the present invention will be described below.

FIG. 4 is a plan view showing the tape running system during normal operation. The vapor deposition tape 1 travels while forming a wrap angle of about 180 degrees on the rotary drum 2 during normal recording and reproduction.
At this time, the rotary drum 2 is rotating at a speed of 9000 rpm.

FIG. 5 is an explanatory diagram showing the data format on the vapor deposition tape. As shown in the figure, an ITI sector 4, an audio sector 5, a video sector 6, and a subcode sector 7 are divided into respective sectors via an edit gap 8. Further, an ID code is added to the audio sector 5 and the video sector 6, and at the time of cueing an image and sound, by detecting the ID code at the beginning of the sector, a desired image and sound can be generated. I'm searching.

The tape running during normal operation will be described with reference to FIG. The vapor deposition tape 1 pulled out from the cassette 11 by the tape loading mechanism 25 (see FIG. 1) is
The rotary drum 2 is mounted with a wrap angle of about 180 degrees.

The tape running in the normal operation after being mounted is as follows. The vapor deposition tape 1 pulled out from the cassette 11 has a fixed guide 12, a tension control pin 13,
After passing through the fixed guide 14, the roller guide unit 15
to go into. The roller guide unit 15 includes a tilt guide 16
Are rotatably engaged, and the vapor deposition tape 1 passes through an inclined guide 16 for obliquely winding the vapor deposition tape 1 around the rotary drum 2 and is wound around the rotary drum 2.

After that, the vapor deposition tape 1 travels along the leads of the rotary drum 2, then passes through the tilt guide 17 and the roller guide unit 18, and enters the fixed guide 19. The vapor deposition tape 1 enters a pinch roller 20 and a capstan 21 that drive the vapor deposition tape 1 while being supported from below. Then, the vapor deposition tape 1 that has passed through the capstan 21 passes through the feeding roller guide 22 and the fixed guide 23 and is wound into the cassette 11.

Next, an embodiment according to the first aspect of the present invention will be described, and tape running during high speed search will be described.

[0032]

First Embodiment The first embodiment is as follows. Figure 2
FIG. 4 is a plan view showing a main part of a tape running system during a high speed search in one embodiment of the present invention. As shown in the figure,
During the high speed search, the tilt guides 16 and 17 are rotated by a predetermined amount in the direction away from the rotary drum by the first driving means 26 in FIG. 1, and the winding angle of the vapor deposition tape 1 on the rotary drum 2 is reduced. It will be about 90 degrees.

FIG. 3 is a perspective view of the tilt guide 17 according to the present invention. Since the tilt guides 16 and 17 have the same configuration, the tilt guide 17 will be described here. The inclined guide pin 17c is fixed to the base 17a,
A is engaged with a member of the roller guide unit 18 so as to rotate around the pin 17b. A hook 17d for rotating the base 17a and a spring 17e are engaged with both ends of the base 17a in the rotation direction.
The driving means 26, for example, a solenoid, hooks 17d
Is sucked and the tilt guide 17 rotates.

At the time of high speed search, the solenoid is operated by a control circuit (not shown), and the tilt guide 17 shown in FIG.
Is sucked in a direction away from the rotary drum, the tilt guide 17 rotates, and the winding angle of the vapor deposition tape 1 on the rotary drum 2 decreases. When the normal reproduction is resumed from the high speed search, the solenoid is released and the attraction force of the spring 17e causes the tilt guide 17 to return to its original position.

The hook 17d in the embodiment shown in FIG.
It is also possible to reverse the mounting position of the spring 17e and rotate the tilt guide 17 in the direction away from the rotary drum by the suction force of the spring at high speed, and return it to the original position by the solenoid at the time of reproduction.

[0036]

Second Embodiment Next, a second embodiment of the present invention will be described. As shown in FIG. 2, the rotary drum 2 is moved to the second position in the direction indicated by the broken line.
By moving the drive means 27 (see FIG. 1), the winding angle of the vapor deposition tape 1 around the rotary drum 2 can be reduced.

FIG. 6 shows a schematic side view for explaining the operation of the second embodiment. The drum 2 has a base 32a different from the base 31 on which the roller guide unit 15 is arranged,
It is rotatably attached to 32b. A long hole 33 is formed in the pedestal 31, and a guide pin 34 fixed to the pedestal 32a is inserted into the long hole 33, and the guide pin 34 moves along the long hole 33. A part of the side surface of the pedestal 32a has a stepped notch or a notch 3 such as a tooth profile of a gear.
5 is formed and is driven by a driving means (not shown) that engages with the cutout portion 35, for example, a latch means or a gear driving means, in a direction in which the rotary drum 2 is moved away from the vapor deposition tape 1 together with the pedestals 32a and 32b during high speed search. To move. Since the stepped notches of the notch portion 35 can be formed at a pitch of 0.1 mm, the movement amount can be controlled with high accuracy and the winding angle can be set arbitrarily.

[0038]

Third Embodiment Next, a third embodiment of the present invention will be shown. Third
This embodiment is a winding angle changing means utilizing the operation of the tape loading mechanism. Tape loading mechanism 2
After the tape 1 is pulled out from the cassette 11 by 5 and the roller guide units 15 and 18 move together with the operation of the tape loading mechanism 25, the vapor deposition tape 1 is mounted on the rotary drum 2 with a wrap angle of about 180 degrees. ,
Tape loading is complete. Here, at the time of high speed search, the winding angle of the vapor deposition tape 1 around the rotary drum 2 is reduced by returning the roller guide units 15 and 18 from the tape loading completion position to a predetermined position.

It should be noted that the winding angle of the vapor deposition tape in the high speed search of the above embodiment is not limited to 90 degrees, and even if it is larger or smaller than this, the occurrence of data reading error can be reduced. It is possible to suppress the deterioration and running instability of the vapor deposition tape.

[0040]

Fourth Embodiment Next, an embodiment according to the second aspect of the present invention will be described. The present embodiment relates to improvement of tape durability and running property and prevention of deterioration of image quality when a vapor deposition tape is used during high speed reproduction.

FIG. 7 is an explanatory diagram showing the data format on the tape of the digital VTR. A video signal having a field frequency of 60 Hz and 525 horizontal scanning lines is recorded by so-called segment recording in which one frame of image data is divided into 10 tracks as shown in FIG. In one track, a track information area 51, an audio data area 52, a video data area 53, and a subcode data area 54 are formed in order from the track head.

FIG. 8 is an explanatory diagram showing the dimensions of each data area in one track in the digital VTR. As shown, the track information area 51, the audio data area 52, and the edit gaps G1 and G3 are 3.844 in total.
mm, the video data area 53 is 27.004 mm, the subcode data area 54 is 0.910 mm, and the overwrite margin area 55 is 0.305 mm. All areas 51-55 and edit gap G
When 1 to G3 are added, it becomes 33.195 mm, and this portion is wound around the rotary drum 2 of the vapor deposition tape 1, and the effective winding angle is 174 °. The diameter of the rotating drum of the digital VTR in this embodiment and the following fifth embodiment is 21.7 mm, and the number of rotations of the drum during recording is 9000.
The rpm and the tape feeding speed are 18.812 mm / s.

9 to 11 show track scanning loci during variable speed reproduction. Fig. 9 shows double speed reproduction, Fig. 10 shows 8
Double-speed reproduction, and FIG. 11 is an explanatory diagram showing 16-speed reproduction.
The tracks 56 are recorded simultaneously by two double azimuth heads arranged on the side of the rotary drum 2.

In FIG. 9, the broken line shows the reproduction scanning locus 57 by the reproducing head, the tape speed is twice that in normal reproduction (37.624 mm / s), and the rotation speed of the rotary drum 2 is the same as in normal reproduction. It is 9000 rpm. The reproducing head is the same as the recording head.

As shown in FIG. 9, during double speed reproduction,
All the video data areas 53 in one frame are not scanned and perfect reproduction is not performed. However, most of the purpose of using the high speed reproduction is to feed the tape quickly to a desired scene, and it is enough that the approximate image can be discriminated during the high speed reproduction. Therefore, as shown in FIG.
It can be used well even if it is played in a scattered manner.

Further, at the time of high speed reproduction, it is not always necessary to reproduce the track information area 51, the audio data area 52, and the subcode data area 54. That is, the image can be reproduced by scanning the video data area 53.

FIG. 12 is an explanatory diagram showing in detail the data arrangement in the video data area. The video data area 53 in one track is composed of 149 lines from the 19th line to the 167th line of the sync block number, and one line consists of 90 bytes. The magnetic head sequentially scans from the 19th line, and the video data area 53 ends at the 167th line. The effective video area 58, which is the minimum required line for image reproduction, is 135 lines from the 21st line to the 155th line.

Since 27.004 mm of the video data area 53 consists of 149 lines, 135 of the effective video area 58.
The line portion corresponds to 24.467 mm. Also, the length of 33.195 mm on the tape is 174 ° of the effective winding angle.
Therefore, 24.467 mm corresponds to 128.2 °. Therefore, if the winding angle of the vapor deposition tape 1 is at least 129 °, the image can be reproduced. It should be noted that an image can be more effectively secured by having a wrap angle of 142 ° corresponding to 27.004 mm.

When the operation mode changes from the normal operation to the high speed reproduction operation, the winding angle of the vapor deposition tape is changed by the winding angle changing means shown in the embodiment of the first aspect. In this embodiment, for example, the inclined guide 1 is arranged so that at least the effective image area 58 of the image data area 53 on the tape comes into contact with the rotary drum 2.
The wrapping angle can be changed by rotating 6 and 17 by a predetermined amount.

Even during the high speed reproduction shown in FIGS. 10 and 11, the rotation speed of the rotary drum 2 is 9000 rpm.
The tape feeding speed is 150.496 mm / with 8x speed playback.
It becomes 300.922 mm / s at 16s speed reproduction. Also in these cases, an image can be reproduced if the winding angle of the vapor deposition tape 1 is at least 129 °.

As described above, at the time of high speed reproduction, by reproducing only the information in the image area, the contact area between the rotary drum and the vapor deposition tape becomes small, and deterioration of the vapor deposition tape and running instability can be prevented. Becomes As a result, the image quality during high-speed reproduction can be ensured, and the durability and running property of the vapor deposition tape can be improved.

[0052]

Fifth Embodiment Next, an embodiment according to the third aspect of the present invention will be described. In this embodiment, the output voltage level of the magnetic head is increased by making the relative speed at the high speed search the same as that at the normal reproduction. FIG. 13 is an explanatory diagram showing a track scanning locus during high-speed search. In the figure, the tape speed is 200 times, and the rotation speed of the rotary drum is lower than that during normal reproduction. Generally, when reproducing a signal recorded on a tape, the wavelength of the reproduced signal relatively changes depending on the tape running speed and the drum rotation angular velocity. That is, it depends on the relative speed between the tape and the head.

When the number of rotations of the rotary drum 2 is the same as that in the normal reproduction and the tape feeding speed is 200 times, the relative speed between the tape and the head becomes higher than that in the normal reproduction.

FIG. 14 is an explanatory view schematically showing the relationship between the tape speed and the magnetic head rotation speed. During normal reproduction, the composite vector of the tape speed vector Vt and the drum rotation vector (magnetic head rotation vector) Vh during normal reproduction becomes the relative speed vector V1 of the rotary magnetic head. Therefore, the relative speed vector V2 when the tape speed is n times speed is a composite vector of the tape speed vector nVt and the drum rotation vector Vh when the tape speed is n times speed.

As shown in the figure, the relative speed increases at n times speed. As a result, even at the same recording frequency,
During high-speed search, the reproduction frequency becomes high and the signal wavelength becomes short. In particular, at 200 times speed, 63% of the wavelength (0.31 μm) with respect to the wavelength (0.49 μm) during normal reproduction.
m).

FIG. 15 is an explanatory diagram showing the reproduction output voltage level by the magnetic head with respect to the wavelength of the recording signal. As shown in the figure, when the wavelength becomes short, the output voltage level of the magnetic head decreases. When the output voltage decreases, the S / N ratio decreases, and as a result, it becomes difficult to maintain a normal search operation. In the present embodiment, at the time of high speed search of 200 times, the rotation speed of the drum is made lower than that at the time of normal reproduction, and the relative speed is made the same as that at the time of normal reproduction, thereby avoiding the shortening of the wavelength of the reproduced signal and increasing the voltage level. Is getting the playback signal of.

The drum rotation speed varying means detects the drum rotation speed from the clock frequency generated by the reproduction signal,
This can be realized by changing the amount of power supplied to the drive motor of the rotary drum in accordance with the tape speed during high-speed search. Alternatively, the number of drum rotations may be detected by a frequency generator attached to the rotary drum, and the amount of power supplied to the drive motor may be varied.

At the time of high-speed search, it is not necessary to reproduce the image, and the subcode data area 5 shown in FIG. 7 is used.
It is only necessary that the time code recorded in 4 can be reproduced. Therefore, the winding angle around the rotary drum 2 may be at least 4.8 ° corresponding to the subcode data area 54. When it is difficult to control the angle of 4.8 °, it is preferable that the subcode data region 54 and the overwrite margin region 55 are combined to be at least 6.3 °.

As described above, by reducing the winding angle of the tape and lowering the number of rotations of the drum, it is possible to prevent the vapor deposition tape from deteriorating and running instability at the time of high-speed search, and to increase the voltage. It is possible to obtain a level reproduction output signal.

By integrating the embodiments from the second and third viewpoints, the normal reproduction mode, the high-speed reproduction mode, and the high-speed search mode can be freely controlled while maintaining the effect of suppressing tape deterioration and running instability. A digital VTR that can be switched to

Although the vapor-deposited tape has been described in Examples 1 to 5, the same effect can be obtained by using the coating type metal medium improved for high density recording.

In the second and third aspects of the above embodiment, the normal tape running speed is 18.812 mm / s.
Although the digital VTR including the above is explained, it can be applied to the digital VTR in which the tape traveling speed is usually defined as 18831 mm / s in the same manner as the above-mentioned respective embodiments. In addition,
One frame in this case consists of 12 tracks.
Further, although the head configuration in each of the above-described embodiments is a configuration in which two tracks are simultaneously recorded / reproduced, a head configuration in which one head is disposed at a position facing the rotary drum may be used. Further, the traveling direction of the tape can be similarly applied to the forward direction or the reverse direction.

[0063]

As described above, the first aspect of the present invention
From the viewpoint of, by reducing the winding angle of the vapor deposition tape around the rotating drum during high-speed search compared to during normal running, it is possible to prevent deterioration of reproduced signals and the occurrence of errors due to repeated high-speed search, It is possible to avoid deterioration of the vapor deposition tape and provide a highly reliable digital VTR.

According to the second aspect of the present invention, by reproducing at least the video area information during high speed reproduction, it is possible to prevent deterioration of the tape and running instability, and to avoid deterioration of image quality. Is possible.

Further, in the third aspect of the present invention, at least the subcode data is reproduced at the time of high speed reproduction, and the relative speed between the tape and the head is set to the same relative speed as that at the time of normal reproduction. And the running instability can be prevented, and a reproduction output signal having a high voltage level can be obtained.

By integrating the present invention from the second and third viewpoints, the normal reproduction mode, the high-speed reproduction mode, and the high-speed search mode can be freely switched while maintaining the effect of suppressing tape deterioration and running instability. It is possible to provide a capable digital VTR.

Then, by providing the first drive means for rotating the tilt guide, or by providing the second drive means for moving the pedestal holding the rotary drum, or by providing the tilt guide and roller guide unit. By returning the tape mounting completion position to a predetermined position, the tape winding angle can be reduced, and it is possible to avoid occurrence of a data reading error and deterioration of the vapor deposition tape.

Further, not only the vapor deposition tape but also a metal coating type tape composed of a thin metal magnetic layer and a non-magnetic layer improved for high density recording can be used to prevent deterioration of the tape in the present invention. It is possible to ensure running stability.

[Brief description of drawings]

FIG. 1 is a schematic skeleton diagram showing a basic configuration provided with a winding angle changing means in the present invention.

FIG. 2 is a plan view showing a tape running system during high speed search according to the present invention.

FIG. 3 is a perspective view showing a rotation mechanism of the tilt guide in the present invention.

FIG. 4 is a plan view showing a tape running system during normal operation.

FIG. 5 is an explanatory diagram showing a data format on a tape.

FIG. 6 is a schematic side view for explaining the operation of the second exemplary embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a data format on a tape of a digital VTR.

FIG. 8 is an explanatory diagram showing the standard of each data area in one track in a digital VTR.

FIG. 9 is an explanatory diagram showing a track scanning locus during 2 × speed reproduction.

FIG. 10 is an explanatory diagram showing a track scanning locus during 8-times speed reproduction.

FIG. 11 is an explanatory diagram showing a track scanning locus during 16 × speed reproduction.

FIG. 12 is an explanatory diagram showing in detail the data arrangement in the video data area.

FIG. 13 is an explanatory diagram showing a track scanning locus during high-speed search.

FIG. 14 is an explanatory diagram schematically showing the relative speed between the tape and the head.

FIG. 15 is a graph showing a reproduction output voltage level with respect to a wavelength of a recording signal.

[Explanation of symbols]

1 vapor deposition tape (or improved metal coating type tape) 2 rotary drum 11 cassette 15, 18 roller guide unit 16, 17 tilt guide 25 tape loading mechanism 26 first drive means 27 second drive means 31, 32a, 32b pedestal 33 length Hole 34 Guide pin 35 Notch 53 Video data area 54 Subcode data area 55 Overwrite margin area 58 Effective video area

Claims (10)

[Claims] 1. A tape on a rotating drum, comprising a roller guide unit forming a part of a tape traveling system and an inclined guide for winding the tape obliquely around the rotating drum, and moving the inclined guide to a predetermined position. In a digital magnetic recording / reproducing apparatus that has a tape loading mechanism that completes the mounting of the tape, and that records and reproduces digital signals using a vapor deposition tape, the winding angle of the vapor deposition tape around the rotary drum during high-speed search is set to the rotary drum during normal recording and playback. A digital magnetic recording / reproducing apparatus comprising a winding angle changing means for reducing the winding angle of the magnetic recording medium. 2. A tape for a rotating drum, which comprises a roller guide unit forming a part of a tape traveling system and an inclined guide for winding the tape obliquely around the rotating drum and moving the inclined guide to a predetermined position. In a digital magnetic recording / reproducing apparatus equipped with a tape loading mechanism for completing the mounting of a digital signal and recording / reproducing a digital signal by using a vapor deposition tape, at least a portion of the image area of the information recorded on the vapor deposition tape can be reproduced during high speed reproduction. As described above, the digital magnetic recording / reproducing apparatus is provided with a winding angle changing means for changing the winding angle of the tape around the rotating drum. 3. A digital magnetic recording / reproducing apparatus comprising a rotating drum having a diameter of 21.7 mm and a rotating drum rotating at 9000 rpm during recording, wherein a vapor deposition tape has a winding angle of at least 129 degrees during high speed reproduction. The digital magnetic recording / reproducing apparatus according to claim 2, wherein the digital magnetic recording / reproducing apparatus is provided. 4. A tape on a rotating drum, which comprises a roller guide unit forming a part of a tape traveling system and a tilt guide for winding the tape obliquely around the rotating drum, and moving the tilt guide to a predetermined position. In a digital magnetic recording / reproducing apparatus that has a tape loading mechanism that completes the mounting of the tape and that records and reproduces digital signals using a vapor deposition tape, at least the information in the subcode area of the information recorded on the vapor deposition tape is reproduced during high-speed search. In order to be able to change the winding angle of the tape around the rotating drum, the winding angle changing means is provided, and the rotation speed of the rotating drum is set to a predetermined value so that the relative speed between the tape and the head is almost the same as that during normal playback. A digital magnetic recording / reproducing apparatus comprising: 5. A digital magnetic recording / reproducing apparatus having a rotating drum diameter of 21.7 mm and a rotating drum rotation speed of 9000 rpm during recording, wherein a winding angle of a vapor deposition tape during a high speed search is at least 4.8. The digital magnetic recording / reproducing apparatus according to claim 4, wherein the digital magnetic recording / reproducing apparatus is in degrees. 6. A digital magnetic recording / reproducing apparatus having the features of both claims 2 and 4. 7. The winding angle changing means comprises a first driving means for rotatably forming the tilt guide according to claim 1 and for rotating the tilt guide by a predetermined amount in a direction away from the rotary drum. 7. The digital magnetic recording / reproducing apparatus according to claim 1, wherein 8. The winding angle changing means comprises second driving means for moving a pedestal holding the rotating drum rotatably by a predetermined amount in a direction away from the vapor deposition tape. Item 7. The digital magnetic recording / reproducing device according to any one of items 1 to 6. 9. The winding angle changing means is means for returning the tilt guide and the roller guide unit to a predetermined position from the completion position of the tape mounting on the rotary drum by the operation of the tape loading mechanism. The digital magnetic recording / reproducing apparatus according to any one of claims 1 to 6, wherein: 10. The digital magnetic according to claim 1, wherein a metal coated tape including a thin metal magnetic layer and a non-magnetic layer is used instead of the vapor deposition tape. Recording / playback device.