JPH11306714A - Magnetic tape cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid causing such damage to signals to improve the reliability of the magnetic tape cartridge that if a magnetic tape is taken up at a high speed, an irregular winding would tend to occur to damage the tape edge located at the irregularly wound part, resulting in the damage of record signals when long stored. SOLUTION: A signal recording area W of a magnetic tape 2 is provided below a buffer area C provided along the tape top edge. The spacing H between opposed reel flanges 5, 6 of the tape reel 3 is set to the tape width B of the magnetic tape 2 plus a gap margin E which is set to a smaller value than the width of the buffer area C to avoid damaging magnetic signals recorded on the signal recording area W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel-to-reel type magnetic tape cartridge and a single-reel type magnetic tape cartridge having tape reels on the left and right inside a case body.

[0002]

2. Description of the Related Art As this kind of magnetic tape cartridge, various kinds of magnetic tape cartridges are generally used for video and computer data. Both have a pair of tape reels on the left and right inside the case body, and record magnetic signals on the magnetic tape while feeding out the magnetic tape from one tape reel and winding it on the other tape reel. .

[0003] The tape reel has a pair of flanges above and below the hub, and the distance between the two flanges is set slightly larger than the width of the magnetic tape. Therefore, in the state where the magnetic tape is wound, a slight margin is generated between the tape winding layer and one of the flanges.

[0004]

As described above, a margin is added to the distance between the pair of flanges facing each other when there is a disturbance factor such as an inclination of the tape traveling system or a variation in the back tension, or when the tape has It is intended to take up the magnetic tape properly without any trouble even when the width dimension varies. Incidentally, in the case of a typical VHS video magnetic tape cartridge in which the tape width of the magnetic tape is 12.65 mm, the conventional clearance is 0.75 mm.
Was set to However, when performing high-speed tape feeding such as a fast-forward mode or a rewind mode, a number of concentric steps may be formed on the tape winding layer within the margin, or a part of the magnetic tape may be tape-wound. Winding turbulence such as protrusion at the upper end surface of the layer occurs. In particular, when a thinner magnetic tape is used in order to improve the signal recording density and lengthen the signal recording time, the tape itself has low rigidity, so that the winding is more likely to be disturbed.

If a magnetic tape is stored for a long period of time with such a winding disturbance, the tape edge protruding from the end surface of the tape winding layer may be damaged, and the recorded signal in that portion may not be reproduced. Particularly, in the case of a thin magnetic tape having low rigidity and low buckling strength, the tape edge is easily damaged. Incidentally, if the magnetic tape is rewound at a low speed, it is possible to return the tape winding layer to an orderly state without any turbulence even when the tape thickness is small. However, this winding operation takes a lot of time and effort,
Inevitably increases costs.

As described above, since it is inevitable that a winding disturbance occurs at the time of high-speed tape winding, the track distribution of the magnetic tape is being changed. For example, conventional VHS
In the case of the magnetic tape cartridge of the system, a mono-channel or stereo-channel audio signal track was secured on the upper edge of the tape. However, without writing a signal to this audio track, the audio signal was recorded inside the main signal recording area. Is recorded in a video system together with a video signal. The present inventor has focused on such a new video system and has developed and improved this.

SUMMARY OF THE INVENTION It is an object of the present invention to suppress the amount of turbulence when a magnetic tape is wound at a high speed, and to prevent the recording signal from being destroyed due to scratches on the tape edge during long-term storage.
It is another object of the present invention to prevent the recording signal from being destroyed even when the tape edge is damaged, thereby improving the reliability of the magnetic tape cartridge during long-term storage.

[0008]

A magnetic tape cartridge according to the present invention is provided inside a case body 1 as shown in FIG.
A tape reel 3 on which the magnetic tape 2 is wound is disposed, and the tape reel 3 has a hub 4 as shown in FIG.
And a pair of upper and lower reel flanges 5 and 6 provided at the upper and lower ends of the hub 4, respectively.
Is set to a value obtained by adding the allowance E to the tape width B of the magnetic tape 2.

In such a magnetic tape cartridge,
According to the present invention, as shown in FIG. 1, the signal recording surface of the magnetic tape 2 is set to have a narrow width along the upper edge of the tape, and a buffer region C where no magnetic signal is recorded and a buffer region C below the buffer region C. A signal recording area W is provided adjacent to and in which a magnetic signal is recorded.
Is set to be equal to or smaller than the width dimension of.

As shown in FIG. 3, a track for obliquely recording a magnetic signal by a rotating magnetic head is provided in the signal recording area W in the longitudinal direction, and a track is provided along the lower edge of the magnetic tape 2. A narrow control track T on which a synchronization control signal corresponding to a track in the signal recording area W is recorded.
Is provided.

The tape width B of the magnetic tape 2 is 12.
When it is 65 mm, the value of the clearance E is 0.25 to 0.5 mm, and the width of the buffer region C is 0.5 to 1.4 mm, more preferably 0.5 to 1.4 mm.
Set to 0.7 mm. Also, the tape width B of the magnetic tape 2 is
When it is 6.35 mm, the value of the clearance E is set to 0.25 to 0.6 mm, and the width of the buffer area C is set to 0.50 mm. Further, when the tape width B of the magnetic tape 2 is 8.0 mm, the value of the clearance E is
0.5 to 0.7 mm, and the width of the buffer area C is set to 0.70 mm.

More specifically, FIG. 1 to FIG.
Illustrates a magnetic tape cartridge for video,
In FIG. 2, a pair of tape reels 3 for winding the magnetic tape 2 is disposed on the left and right inside the case body 1. The entire amount of the magnetic tape 2 before recording the magnetic signal is wound around the left tape reel 3 in FIG. 2, and the magnetic tape 2 fed from the left tape reel 3 is replaced with the right tape reel 3. And a reel-to-reel system in which a magnetic signal is recorded on the magnetic layer while being wound.
The magnetic tape 2 at the time of signal recording is pulled out to the front of the case body 1, and a magnetic signal is recorded by a rotating magnetic head.

In FIG. 3, the signal recording surface (magnetic layer) of the magnetic tape 2 includes a narrow buffer region C provided along the upper edge of the tape and a signal recording region W adjacent below the buffer region C. , And a narrow control track T provided along the lower edge of the tape. In the signal recording area W, a video track for obliquely recording a video signal by a rotating magnetic head is provided adjacent to the longitudinal direction. Synchronization control signals corresponding to these video tracks are recorded on the control track T. The buffer area C is formed in a non-signal area where a magnetic signal is not recorded. Conventionally, the audio signal recorded in the buffer area C is recorded together with the video signal at the track end or in the middle of the track of the signal recording area W in both monaural and stereo cases.

In FIG. 1, a tape reel 3 is a hub 4
And a pair of upper and lower reel flanges 5 and 6 provided at the upper and lower ends of the hub 4. A spline hole-shaped drive hole is provided inside the hub 4 so as to open downward, and the entire tape reel 3 can be rotationally driven by a drive-side drive shaft that is fitted and engaged in the hole. In order to take up the magnetic tape 2 without hindrance,
The opposing interval H between the upper and lower reel flanges 5 and 6 is set to a value obtained by adding a margin E to the tape width B of the magnetic tape 2.

When the magnetic tape 2 is taken up by the tape reel 3, the maximum upward displacement of the magnetic tape 2 is equal to the value of the margin E. Therefore, the value of the clearance E is set smaller than the width of the buffer region C, and even when the magnetic tape 2 is wound on the tape reel 3 in a state where the magnetic tape 2 is displaced by the maximum amount of displacement, The upper portion of the signal recording area W is prevented from being exposed to the space defined by the allowance E.

If the value of the allowance E is too small, serious troubles such as a tape edge caught on the periphery of the reel flanges 5 and 6 are likely to occur. To avoid such a serious winding defect, the minimum value of the clearance E is 0.25.
mm or more, and more preferably the same value is set to 0.3 mm or more. Further, if the value of the allowance E is too large, turbulent winding will be promoted. Therefore, the maximum value of the allowance E is set to 0.7 mm or less.

[0017]

As described above, according to the tape reel 3 in which the value of the margin gap E is set in relation to the buffer area C, the magnetic tape can be used at the time of tape feeding at a high speed such as a fast-forward mode or a rewind mode. 2, even if winding disturbance occurs, the maximum amount of winding disturbance can be suppressed as compared with the conventional example. Further, since the maximum amount of the turbulence is always smaller than the width of the buffer region C, even if the tape edge protruding toward the margin E is deformed or bent, the signal recording region W is left. Dropout and distortion of the recorded magnetic signal can be reliably prevented, and reliability during long-term storage can be improved. When the width of the buffer area C is less than the clearance (0.7
When it is smaller than 5 mm), the maximum amount of turbulence can be suppressed as compared with the conventional tape reel, and the position where the tape edge is damaged can be moved away from the signal recording area W by that much.

[0018]

Embodiments of the present invention will be described below. (Example 1) 10.1 μm made of a polyester film
By forming a 2.9 μm thick magnetic layer on a thick film base, a magnetic tape 2 having a tape width B of 12.65 mm can be obtained.
Was made. In this case, the width of the buffer area C is 1.4 mm,
The width of the signal recording area W was set to 10.15 mm, and the width of the control track T was set to 1.1 mm. The distance H between the upper and lower reel flanges 5 and 6 on the tape reel 3 is 12.9 mm, and the value of the margin E at that time is 0.25 mm.
mm. Thus, the tape reel 3 on which the magnetic tape 2 was wound was housed and arranged on the left and right inside the case body 1 to obtain the magnetic tape cartridge shown in FIG.

Example 2 A magnetic layer having a thickness of 0.16 μm was formed on a film base having a thickness of 6.4 μm made of a polyester film by a vacuum deposition method, so that a tape width B was 6.3.
A 5 mm magnetic tape 2 was prepared. In this case, the width of the buffer area C was set to 0.5 mm, and the width of the signal recording area W was set to 5.85 mm. The distance H between the upper and lower reel flanges 5 and 6 on the tape reel 3 was set to 6.85 mm, and the value of the margin E at that time was set to 0.5 mm. Thus, Example 1
A magnetic tape cartridge was obtained in the same manner as described above.

Example 3 A magnetic tape 2 having a tape width B of 8.0 mm was prepared by applying a 2.5 μm thick magnetic layer to a 7.5 μm thick film base made of a polyester film. The width of the buffer area C is 0.7
The width of the signal recording area W was set to 7.3 mm. The upper and lower reel flanges 5 on the tape reel 3
The facing distance H of No. 6 was 8.7 mm, and the value of the allowance E at that time was 0.7 mm. Thus, a magnetic tape cartridge was obtained in the same manner as in Example 1.

The magnetic tape cartridge of the present invention is not limited to a video tape cartridge, but may be used for backing up computer data.

[Brief description of the drawings]

FIG. 1 is a sectional view of a tape reel.

FIG. 2 is an internal plan view of the magnetic tape cartridge.

FIG. 3 is a schematic explanatory diagram of a signal recording pattern of a magnetic tape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case main body 2 Magnetic tape 3 Tape reel 4 Hub 5.6 Reel flange B Tape width C Buffering area E Margin gap H Opposing interval W Signal recording area

Claims (5)

[Claims] 1. A tape reel 3 on which a magnetic tape 2 is wound is disposed inside a case body 1. The tape reel 3 includes a hub 4, and a pair of upper and lower reel flanges provided at upper and lower ends of the hub 4. The space H between the upper and lower reel flanges 5 and 6 of the tape reel 3 is set to a value obtained by adding a margin E to the tape width B of the magnetic tape 2. The buffer area C where the signal recording surface is set to be narrow along the upper edge of the tape and no magnetic signal is recorded.
And is provided adjacent to the lower side of the buffer area C,
A magnetic tape cartridge comprising a signal recording area W in which a magnetic signal is recorded, wherein the value of the allowance E is set to be equal to or smaller than the width of the buffer area C. 2. A signal recording area W is provided with a track in which a magnetic signal is obliquely recorded by a rotating magnetic head in a longitudinal direction, and a track is formed along a lower edge of the magnetic tape 2. 2. The magnetic tape cartridge according to claim 1, further comprising a narrow control track T on which a synchronization control signal corresponding to the W track is recorded. 3. The tape width B of the magnetic tape 2 is 12.65 mm.
, The value of the clearance E is 0.25 to 0.5 mm, and the buffer area C
3. The magnetic tape cartridge according to claim 1, wherein a width dimension of the magnetic tape cartridge is set to 0.5 to 1.4 mm. 4. When the tape width B of the magnetic tape 2 is 6.35 mm, the value of the clearance E is set to 0.25 to 0.5 mm, and the width of the buffer area C is set to 0.50 mm. 3. The magnetic tape cartridge according to 1 or 2. 5. When the tape width B of the magnetic tape 2 is 8.0 mm, the value of the allowance E is set to 0.5 to 0.7 mm, and the width dimension of the buffer area C is set to 0.70 mm. 3. The magnetic tape cartridge according to 1 or 2.