JP2009104713A - Cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cartridge which prevents increase in production lead time while preventing winding disorder even if a magnetic tape is taken up at high speed. <P>SOLUTION: The cartridge comprises a magnetic tape 3 and a reel 2 which takes up the magnetic tape 3. The reel 2 has a hub 4 which takes up the magnetic tape 3, a first flange 5 prepared at one end of the hub 4, and a second flange 6 prepared at the other end of the hub 4. The first flange 5 includes a conductive material and its surface electric resistance value is ≤10<SP>12</SP>Ω/square, and the surface electric resistance value of the second flange 6 is ≥10<SP>14</SP>Ω/square. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cartridge that rotatably stores a reel around which a magnetic tape is wound.

  As shown in FIG. 7, the magnetic tape cartridge is configured such that the magnetic tape 103 is housed in a reel 102 in which an upper flange 105 and a lower flange 106 are coupled to a hub 104, and the reel 102 is built in a tape case 101. When the cartridge 107 having such a configuration is loaded into a recording / reproducing apparatus (hereinafter referred to as a drive apparatus), the reel 102 is engaged with a reel drive shaft on the drive apparatus side and rotated. Further, the cartridge 107 opens the magnetic tape 103 by rotating a lid (not shown) that opens and closes a tape loading space formed in the front portion. The drive device loads the opened magnetic tape 103 from the front surface of the cartridge 107 onto a magnetic head (not shown), and runs the magnetic tape 103 while performing a predetermined recording / reproducing operation.

  The reel 102 constituting the cartridge 107 is generally formed by injection molding a thermoplastic synthetic resin material such as ABS (acrylonitrile butadiene styrene) or POM (polyacetal) from the viewpoint of productivity and weight reduction. On the other hand, the magnetic tape 103 is configured by applying a magnetic material on an insulating nonmagnetic support such as PET (polyethylene terephthalate) by coating or vapor deposition.

  Therefore, the upper flange 105 and the lower flange 106 may be charged by friction with the nonmagnetic support of the magnetic tape 103. As described above, when the magnetic tape 103 is wound into the cartridge 107 by using the reel 102 in which the upper flange 105 and the lower flange 106 are charged, a force for pulling the magnetic tape 103 toward the upper flange 105 and the lower flange 106 during winding. (Electrostatic attractive force) acts.

  The magnetic tape 103 is wound up while the air between the magnetic tapes 103 is discharged by the winding tension (usually, it is uniformly pushed out to the upper flange side and the lower flange side). When the magnetic tape 103 is wound around the cartridge 107, if electrostatic attraction acts on the upper flange 105 and the lower flange 106, the winding tension of the magnetic tape 103 becomes unstable in the width direction, and the air is discharged. Becomes unstable.

  The magnetic tape 103 is subjected to air discharge reaction (pneumatic force) applied to the opposite side to the air discharge side and the above-described electrostatic attraction. Therefore, when the direction in which air is discharged during winding becomes unstable, the resultant force of the air exhaust force and the electrostatic attractive force becomes unstable. Therefore, a part of the magnetic tape 103 protrudes from the tape edge on the upper flange 105 and the lower flange 106 side, and so-called “rolling disturbance” in which the magnetic tape 103 becomes uneven is generated.

  On the other hand, from the viewpoint of production efficiency of magnetic tape and the necessity of reading a necessary area in a short time during use, it is desired to increase the winding speed. Increasing the winding speed of the magnetic tape tends to cause winding disturbance. The magnetic tape 103 in which the turbulence is generated while being wound around the cartridge 107 is easily damaged by the tape edge during transportation, which is a serious problem in quality control as a recording medium.

In order to solve such a problem, a method for suppressing the winding disturbance of the magnetic tape has been proposed by the following method (see, for example, Patent Document 1). In this method, at the time of manufacturing a magnetic tape, a wide magnetic tape (magnetic tape original) is cut to a specified width, and then the magnetic tape is wound around a taper-shaped reel to create a pancake. Next, in the prepared pancake, the shape change with time occurring in the width direction of the magnetic tape is biased (curved) to one side by being stored in a high temperature and high humidity environment for a long time. Next, the magnetic tape curved in this way is wound around the cartridge by a predetermined length. Since the magnetic tape is curved, the air discharge direction is stable and turbulence can be suppressed.
JP 2005-228448 A

  In the above conventional winding method, in order to obtain the amount of bending required for the magnetic tape, it is necessary to store the magnetic tape in a high temperature and high humidity environment for a long time. Therefore, there is a problem that production lead time becomes long due to long-term storage.

  An object of the present invention is to provide a cartridge that does not cause turbulence even when a magnetic tape is wound at a high speed and does not lengthen the production lead time.

  The cartridge of the present invention includes a magnetic tape and a reel for winding the magnetic tape. The reel includes a hub for winding the magnetic tape, a first flange provided at one end of the hub, and the hub. And a second flange provided at the end. In order to solve the above problems, the first flange includes a conductive material.

  Here, including a conductive material includes a case where a conductive material is formed on the surface of the first flange and a case where a conductive filler is added to the constituent material of the first flange.

  According to the present invention, since electrostatic attraction acts only in one direction of the magnetic tape at the time of winding, there is no turbulence even if the magnetic tape is wound at high speed, and there is no need to lengthen the production lead time. Can be provided.

  In the cartridge of the present invention, the first flange may be configured such that a conductive material is formed on the surface.

  The first flange may be made of a synthetic resin material to which a conductive filler is added.

  Moreover, it can also be set as the structure whose ratio of the surface electrical resistance value of a said 2nd flange and a said 1st flange is 100 or more.

The first flange may have a surface electrical resistance value of 10 ¹² Ω / □ or less, and the second flange may have a surface electrical resistance value of 10 ¹⁴ Ω / □ or more.

  Hereinafter, preferred embodiments of the reel of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view showing a configuration of a cartridge 7 according to Embodiment 1 of the present invention. A reel 2 around which a magnetic tape 3 is wound is provided on a tape case 1. The reel 2 includes a hub 4 that winds the magnetic tape 3, an upper flange 5, and a lower flange 6 (first flange or second flange).

  FIG. 2 is a cross-sectional view showing the structure of the magnetic tape 3. On the surface of a nonmagnetic base film 11 made of PET (polyethylene terephthalate), PEN (polyethylene naphthalate), or the like, a magnetic layer 12 is formed by applying a magnetic material by coating or vapor deposition. A protective layer 13 can be provided on the magnetic layer 12. Furthermore, the lubricating layer 14 can be provided on the protective layer 13. A back coat layer 15 made of urethane or the like is formed on the back surface of the base film 11.

  As an example of the tape case 1 of FIG. 1, an 8 mm video tape cassette for a video tape recorder will be described. The upper flange 5 and the lower flange 6 are made of PS (polystyrene) resin, POM (polyacetal) resin, AS (acrylonitrile styrene) resin, ABS (acrylonitrile butadiene styrene) resin in consideration of strength and ease of molding. And synthetic resin such as PC (polycarbonate) resin. The upper flange 5 is preferably formed using a transparent synthetic resin material such as an AS resin, a PS resin, or a PC resin so that the winding state of the magnetic tape 3 can be confirmed as will be described later.

  The upper flange 5 is configured such that a conductive material is formed on the surface and the surface electrical resistance value is lower than that of the lower flange 6. The surface electrical resistance value is measured by, for example, a measurement method defined in ASTM-D257.

  One end of a transparent leader tape (not shown) is fixed to the reel 2 configured as described above via a clamper (not shown). The other end of the leader tape is joined to the end of the magnetic tape 3 via a splice tape (not shown), and the continuous magnetic tape 3 is wound around the reel 2 in the tape case 1. .

  Next, an example of the winding operation of the magnetic tape 3 in the cartridge of the present invention will be described. The magnetic tape 3 has a total thickness of approximately 5 μm and has the structure shown in FIG. First, a wide tape having a width of 50 cm or more (hereinafter referred to as a magnetic tape original fabric) is cut into a width of 8 mm using a slitting device, wound up on a hub without a flange, and a pancake is formed. The original magnetic tape is cut by passing through the blade of the slitting device at a speed of 1.6 m / s to 5 m / s to form a pancake made of 10000 m of magnetic tape 3.

  Next, the magnetic tape 3 cut to a width of 8 mm is wound into the cartridge 7 by a specified length. FIG. 3 is a plan view showing a configuration of a winding device that winds the magnetic tape 3 from the pancake 22 onto the cartridge 7. The magnetic tape 3 is wound around the reel 2 of the cartridge 7 from the pancake 22 wound around the hub 21 via the induction roll 23. The speed at which the magnetic tape 3 is wound around the cartridge 7 is 20 m / s, the length at which the magnetic tape 3 is wound around one cartridge 7 is approximately 200 m, and the tension applied to the magnetic tape 3 during winding is 0.3 N or less.

  In the running system from the pancake 22 to the inside of the cartridge 1, the cleaning tape may be brought into contact with the surface of the magnetic tape 3 for the purpose of cleaning the surface of the magnetic tape 3. Further, the polishing tape may be brought into contact with the surface of the magnetic tape 3 for the purpose of smoothing the surface property of the magnetic tape.

  When the magnetic tape 3 is wound around the cartridge 7, the lower flange 6 constituting the reel 2 comes into contact with an insulating layer such as the base film 11 or the back coat layer 15 of the magnetic tape 3 to be wound and is charged. The lower flange 6 is charged at a place where it comes into contact with the magnetic tape 3. Accordingly, when the magnetic tape 3 is wound, electrostatic attraction acts only on the magnetic tape 3 and the lower flange 6, and the air discharge direction of the magnetic tape 3 is stably wound in one direction. Can be suppressed.

  Whether the magnetic tape 3 is disturbed or not is verified by disassembling the cartridge 7 and observing the appearance of the magnetic tape 3 wound around the reel 2 (hereinafter referred to as a winding shape). be able to. FIG. 4 is a cross-sectional view showing cutting including the center of the hub 4 of the reel 2 around which the magnetic tape 3 according to the present embodiment is wound. 4A shows a state where there is no turbulence, and FIGS. 4B and 4C show a state where turbulence has occurred.

  The winding state is confirmed by checking whether there is a space between the magnetic tape 3 and the upper flange 5 by visual observation from the outside of the reel 2 toward the center (in the direction of the arrow) perpendicular to the rotation axis of the reel 2. When there is no winding disturbance, as shown in FIG. 4A, a space is observed between the magnetic tape 3 and the upper flange 5 from the outermost peripheral portion of the wound magnetic tape 3 to the hub 4 side. On the other hand, when the winding is disturbed, no space is observed between the magnetic tape 3 and the upper flange 5 as shown in FIG. Alternatively, as shown in FIG. 4C, the space between the magnetic tape 3 and the upper flange 5 is locally narrower from the outermost peripheral portion of the wound magnetic tape 3 to the hub 4 side. Is observed. In addition, when the surface electrical resistance value of the lower flange 6 is lower than that of the upper flange 5, the winding shape is confirmed depending on whether there is a space between the magnetic tape 3 and the lower flange 6.

  Further, as shown in FIG. 5, for a cartridge that does not have a transparent window for checking the remaining amount of tape, the winding state can be confirmed without disassembling the cartridge using X-rays.

  40 or more rolls of the cartridge 7 wound with the magnetic tape 3 were formed from the pancake made of the 10,000 m magnetic tape 3, and all the cartridges 7 were disassembled to confirm the winding form.

FIG. 6 shows the ratio (%) at which the magnetic tape 3 can be wound up without being disturbed when the magnetic tape 3 is wound at the adjusted surface electrical resistance values of the upper flange 5 and the lower flange 6. It is a table | surface which shows. The upper flange 5 is made of PS resin having a surface electric resistance value of 1 × 10 ¹⁶ Ω / □, and the lower flange 6 is made of POM resin having a surface electric resistance value of 1 × 10 ¹⁴ Ω / □. In order to obtain a predetermined surface electric resistance value, silver is deposited on the surfaces of the upper flange 5 and the lower flange 6 by sputtering. When the surface electrical resistance value of one flange is 1 × 10 ¹⁴ Ω / □ or more and the surface electrical resistance value of the other flange is 10 ¹² Ω / □ or less, the magnetic tape should be wound up without being disturbed. I was able to. In other cases, turbulence occurred frequently.

Further, when the upper flange 5 is composed of AS resin (surface electrical resistance value 1 × 10 ¹⁶ Ω / □) and the lower flange 6 is composed of POM resin (surface electrical resistance value 10 ¹⁴ Ω / □), the flange When the magnetic tape 3 was wound while the surface electrical resistance value was changed by forming a film of silver on the surface by sputtering, the same result as in FIG. 6 was obtained.

  As described above, the cartridge according to the present embodiment causes the magnetic tape 3 to be wound without being disturbed by causing a difference in surface electrical resistance between the upper flange 5 and the lower flange 6 of the reel 2 on which the magnetic tape 3 is wound. Can be wound up.

  In the first and second embodiments, in order to adjust the surface electrical resistance value of the flange, the conductive material was formed by sputtering on the flange surface. However, a conductive film may be formed by plating. A conductive film may be formed by applying a conductive material.

  Moreover, although silver was sputtered to adjust the surface electrical resistance value, other conductive materials can be used.

(Embodiment 2)
In the reel 2 of the cartridge according to the second embodiment of the present invention, the upper flange 5 is made of PS resin (surface electrical resistance value 1 × 10 ¹⁶ Ω / □), and the lower flange 6 is POM resin (surface electrical resistance value 1). × 10 ¹⁴ Ω / □). Carbon nanotubes are added as conductive fillers to the upper flange 5 and the lower flange 6 to change the surface electrical resistance value. Other configurations of the cartridge are the same as those of the cartridge according to the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

  Here, the conductive filler is a filler added to impart electrical conductivity to the flange, and includes a granular filler, a flaky filler, and a fibrous filler. The particulate filler is typically conductive carbon, and the flaky filler includes aluminum flake, nickel flake, nickel-coated mica and the like. In addition, there are fibrous fillers in which carbon, aluminum, copper, brass, stainless steel, or the like is formed into a fibrous shape. In this embodiment, carbon nanotubes are used as the conductive filler, but the present invention is not limited to this.

When the surface electrical resistance values of the upper flange 5 and the lower flange 6 are changed and the magnetic tape is wound up at the respective surface electrical resistance values, the ratio at which the magnetic tape can be wound up without being disturbed is the same as in FIG. It became. That is, when the surface electrical resistance value of one flange is 10 ¹⁴ Ω / □ or more and the surface electrical resistance value of the other flange is 10 ¹² Ω / □ or less, the magnetic tape is wound up without being disturbed. I was able to. In other cases, turbulence occurred frequently.

  Hereinafter, specific examples of the reels 2 of Embodiments 1 and 2 and examples of reels (comparative examples) in which winding disturbance occurs in comparison with the examples will be shown.

  Examples 1 and 2 and Comparative Examples 1 to 3 are examples using the cartridge in Embodiment 1, and Examples 3 and 4 and Comparative Examples 4 and 5 are examples using the cartridge in Embodiment 2. is there.

(Example 1)
Silver was sputtered on the surface of the upper flange 5 to adjust the surface electrical resistance value to 1 × 10 ¹² Ω / □. Silver was not sputtered on the surface of the lower flange 6, and the surface electrical resistance value was 10 ¹⁴ Ω / □. When the magnetic tape 3 was wound at a high speed with such a configuration, it could be wound without any winding disturbance. This is because an electrostatic attractive force is generated only between the lower flange 6 and the magnetic tape 3 and the air discharge direction of the magnetic tape 3 is constant.

(Comparative Example 1)
Silver was sputtered on the surface of the lower flange 6 to adjust the surface electrical resistance value to 1 × 10 ¹² Ω / □. Silver was not sputtered on the surface of the upper flange 5, and the surface electrical resistance value was 1 × 10 ¹⁶ Ω / □. When the magnetic tape 3 was wound at a high speed with such a configuration, the cartridge 7 that could be wound without being disturbed was 16% of the whole.

  This is because the electrostatic attraction acting on the magnetic tape 3 by the upper flange 5 and the lower flange 6 is small or not, so that the running of the magnetic tape 3 becomes unstable when winding at high speed. In this case, when the magnetic tape 3 is wound at a low speed, the air between the tapes is normally evenly pushed out to the upper flange 5 side and the lower flange 6 side by the winding tension so that the magnetic tape 3 is not disturbed. However, when the winding is performed at high speed, the winding tension applied in the width direction of the magnetic tape 3 becomes unstable due to the extremely small curvature in the longitudinal direction of the magnetic tape 3.

(Comparative Example 2)
Silver was sputtered on the surface of the upper flange 5 to adjust the surface electrical resistance value to 1 × 10 ¹⁴ Ω / □. The lower flange 6 was not sputtered with silver and had a surface electrical resistance value of 1 × 10 ¹⁶ Ω / □.

  When the magnetic tape 3 was wound at a high speed with such a configuration, 7% of the cartridges could be wound without being disturbed. This is because winding of the magnetic tape 3 becomes unstable because the upper flange 5 and the lower flange 6 are charged and attract the magnetic tape 3.

  As described above, by using the reel 2 of the present invention, the lower flange 6 is charged by friction with the nonmagnetic support of the magnetic tape 3. When the magnetic tape 3 is wound into the cartridge 1 using the reel 2 charged on the lower flange 6 in this way, since the magnetic tape 3 acts on one side on the lower flange 6 side during winding, the magnetic tape 3 is magnetic. Even if the tape 3 is wound around the cartridge 7 at a high speed, the winding disturbance can be prevented.

(Example 2)
The upper flange 5 was made of AS resin on which silver was not sputtered, and the surface electric resistance value was 1 × 10 ¹⁶ Ω / □. Further, the lower flange 6 was made of POM resin, and silver was sputtered on the surface to adjust the surface electric resistance value to 1 × 10 ¹² Ω / □. When the magnetic tape 3 was wound up at a high speed using the reel 2 having such a configuration, the magnetic tape 3 could be wound up without being disturbed.

  This is because the friction between the magnetic tape 3 and the upper flange 5 causes electrostatic attraction between the magnetic tape 3 and the upper flange 5, and the direction of air discharge when the magnetic tape 3 is wound is constant. .

(Comparative Example 3)
Silver was not sputtered on the upper flange 5 and the lower flange 6, and the surface electrical resistance values were 1 × 10 ¹⁶ Ω / □ and 1 × 10 ¹⁴ Ω / □, respectively. When the magnetic tape 3 was wound at a high speed with such a configuration, there were hardly any cartridges 7 that could be wound without being disturbed. This is because the upper flange 5 and the lower flange 6 are charged and electrostatic attraction is generated between the magnetic tape 3 and the air discharge direction is disturbed when winding, and the winding of the magnetic tape 3 becomes unstable. It is because it became.

(Example 3)
The upper flange 5 was made of PS resin, and carbon nanotubes were added to adjust the surface electrical resistance value to 1 × 10 ¹² Ω / □. The lower flange 6 was made of POM resin, carbon nanotubes were not added, and the surface electrical resistance value was 1 × 10 ¹⁴ Ω / □.

  When the magnetic tape 3 was wound at a high speed with such a configuration, no turbulence occurred. This is because the lower flange 6 is charged by contact with the magnetic tape 3, and electrostatic attraction is generated between the magnetic tape 3 and the lower flange 6 by charging, and the air discharge direction of the magnetic tape 3 is constant. .

Example 4
Carbon nanotubes were added to the lower flange 6 to adjust the surface electrical resistance value to 1 × 10 ¹² Ω / □. No conductive filler was added to the upper flange 5 and the surface electrical resistance value was 1 × 10 ¹⁴ Ω / □. When the magnetic tape 3 was wound at a high speed with the reel 2 having such a configuration, no winding disturbance occurred. The wound magnetic tape 3 was wound along the upper flange 6 side in the reel 2. This is because an electrostatic attractive force is generated between the upper flange 6 and the magnetic tape 3 and the air discharge direction of the magnetic tape 3 is constant.

(Comparative Example 4)
Carbon nanotubes were added to the upper flange 5 to adjust the surface electrical resistance value to 1 × 10 ¹² Ω / □. Further, carbon nanotubes were added to the lower flange 6 to adjust the surface electrical resistance value to 1 × 10 ¹² Ω / □.

  When the magnetic tape 3 was wound at a high speed with such a configuration, there were hardly any cartridges 7 that could be wound without being disturbed. This is because no electrostatic attractive force is generated between the upper flange 5 and the lower flange 6 and the magnetic tape 3, so that the direction of air discharge during winding is disturbed and the winding of the magnetic tape 3 becomes unstable. .

(Comparative Example 5)
Carbon nanotubes were added to the upper flange 5 to adjust the surface electrical resistance value to 1 × 10 ¹⁴ Ω / □. Further, carbon nanotubes were added to the lower flange 6 to adjust the surface electrical resistance value to 1 × 10 ¹⁴ Ω / □.

  When the magnetic tape 3 was wound up at a high speed with such a configuration, there were almost no cartridges that could be wound up without being disturbed. This is because the upper flange 5 and the lower flange 6 are charged and electrostatic attraction is generated between the upper flange 5 and the lower magnetic tape 3, so that the direction of air discharge during the winding is disturbed and the winding of the magnetic tape 3 becomes unstable. It is because it became.

  From the results of the above-described Embodiments 1 to 4 and Comparative Examples 1 to 5, the upper flange 5 and the lower flange 6 may have the same winding result by either sputtering or addition of conductive filler. Recognize. That is, it can be seen that the winding of the magnetic tape 3 depends on the surface electrical resistance values of the upper flange and the lower flange 6.

  As described above, according to the present invention, the magnetic tape 3 can be wound up without being disturbed by causing a difference in surface electrical resistance between the upper flange 5 and the lower flange 6 of the reel 2 on which the magnetic tape 3 is wound.

  In addition, it can also be set as the structure which suppresses winding disorder by irradiating the upper flange 5 or the lower flange 6 with a positive or negative electric charge, and charging. The charge to be applied is applied in a direct current, alternating current, or pulse form. Moreover, since it can wind up without disturbance by enlarging the electric potential difference of the upper flange 5 and the magnetic tape 3 or the lower flange 6 and the magnetic tape 3, it can also be set as the structure which irradiates a plus or minus electric charge to a magnetic tape. .

  Moreover, the range of the optimum surface electric resistance value of the upper flange 5 and the lower flange 6 is not necessarily the above-described range, and varies depending on the mass of the magnetic tape 3 and the winding speed. It is not limited.

  Of course, the present invention is not limited to this embodiment.

  The cartridge of the present invention has an advantage that even when the magnetic tape is wound at high speed, there is little turbulence and can be used for a magnetic storage medium.

1 is an exploded perspective view showing a configuration of a cartridge according to a first embodiment of the present invention. Sectional view of the magnetic tape wound around the cartridge The block diagram which shows the structure of the winding apparatus which winds up magnetic tape to a cartridge same as the above Sectional drawing which shows the case where the winding form of the cartridge which concerns on this Embodiment is (a) When there is no winding disorder, (b), (c) When there is winding disorder The perspective view which shows the external shape of another cartridge in this Embodiment Table showing the yield of magnetic tape when the surface electrical resistance of the upper and lower flanges is changed An exploded perspective view showing a configuration of a conventional cartridge

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tape case 2 Reel 3 Magnetic tape 4 Hub 5 Upper flange 6 Lower flange 7 Cartridge 11 Base film 12 Magnetic layer 13 Protective layer 14 Lubricating layer 15 Backcoat layer 21 Hub 22 Pancake 23 Guide roll

Claims (5)

Magnetic tape,
A reel for winding the magnetic tape,
The reel
A hub for winding magnetic tape,
A first flange provided at one end of the hub;
In a cartridge having a second flange provided at the other end of the hub,
The cartridge according to claim 1, wherein the first flange includes a conductive material.   The cartridge according to claim 1, wherein a conductive material film is formed on a surface of the first flange.   The cartridge according to claim 1, wherein the first flange is made of a synthetic resin material to which a conductive filler is added.   The cartridge according to any one of claims 1 to 3, wherein a ratio of surface electrical resistance values of the second flange and the first flange is 100 or more. The first flange has a surface electrical resistance value of 10 ¹² Ω / □ or less,
The cartridge according to claim 4, wherein the second flange has a surface electrical resistance value of 10 ¹⁴ Ω / □ or more.

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