JP4651869B2 - Reel for recording media tape - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording media tape reel in which a disc-shaped flange is welded to an end of a cylindrical hub that winds a tape around an outer peripheral surface.
[0002]
[Prior art]
One type of recording media used in recording and playback devices such as external storage devices such as computers is a recording media tape such as a magnetic tape. This recording media tape is wound around a reel and accommodated in one reel or two. A reel-type recording medium cartridge is provided, loaded in a recording / reproducing apparatus, and a recording medium tape is run as the reel rotates, and recording / reproduction is performed on the recording surface.
[0003]
For example, in the external storage magnetic tape, the capacity that can be recorded per volume has recently increased from several tens GB to several hundred GB. In order to realize this high capacity, the track pitch width is narrowed, the tape thickness is reduced to increase the amount of stored tape, and servo signals are written. Accordingly, high precision is required for the tape running mechanism and the cartridge structure of the drive device, and in particular, the shape accuracy and strength of the reel on which the recording media tape is wound are required.
[0004]
The reel includes a cylindrical hub that winds a tape around an outer peripheral surface, and flanges that are positioned on both sides of the tape that is wound in a disk shape from both ends of the hub. In general, when this reel is formed of a resin molded product, one flange and a hub are integrally formed, and the other flange formed separately is fixed to the end of the hub.
[0005]
The hub and the flange are usually fixed by ultrasonic welding. This ultrasonic welding is short in processing time, lowers the running cost in that the molded product is directly melt-bonded, and is widely used in the manufacture of reels.
[0006]
[Problems to be solved by the invention]
By the way, if the recording density of the recording media tape is increased as described above, the influence on the recording / reproducing characteristics due to the fluctuation in the width direction of the tape occurs, and the tape traveling height accuracy is required more strictly. If the variation in the tape running position is large, read / write errors increase and the reliability decreases.
[0007]
Further, in order to improve the contact with the head and improve the adhesion, the tape tension tends to increase. When the tape tension increases, the load applied to the reel increases, and the hub is compressed by the load, for example, the flange. There arises a problem that deformation occurs so that the tape travel height is insufficiently regulated and errors are increased.
[0008]
On the other hand, the flange in the conventional reel is formed of a transparent material so that the amount and state of winding of the tape can be observed, and the above-described deformation tends to occur greatly due to its elastic modulus, that is, strength different from that of the hub. . In particular, when the flange is welded to the end portion of the hub, the strength of the flange on the welding side to which ultrasonic vibration is applied is likely to be reduced.
[0009]
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a recording medium that suppresses the winding load accompanying the increase in tape tension and the deformation accompanying welding and ensures the tape running height accuracy to obtain good recording / reproducing characteristics. The object is to provide a tape reel.
[0010]
[Means for Solving the Problems]
The reel for recording media tape of the present invention has a lower flange made of a disc-shaped resin material and an inner peripheral portion of one end of the hub at one end of a hub made of a cylindrical resin material on which the tape is wound around the outer peripheral surface. are integrally molded with the bottom wall being connected so as to close the, the other open end of said hub, recording medium tape made by welding a flange on which are separately molded by a disk-shaped resin material In the reel, the upper flange has a circular opening at the center, and a peripheral edge of the central circular opening is welded to the other opening end of the hub, and the upper flange has the same thickness as the lower flange. The upper flange is formed of a resin material having a higher elastic modulus than the resin material of the integrally formed hub and lower flange .
[0012]
Another recording media tape reel of the present invention has a lower flange made of a disc-shaped resin material and one end portion of the hub inside a hub made of a cylindrical resin material on which the tape is wound around the outer peripheral surface . peripheral portion is connected and a bottom wall so as to close the are integrally molded, the other open end of said hub, made by welding a flange on which are separately molded by a disk-shaped resin material recording medium In the tape reel, the upper flange has a circular opening in the center, and a peripheral edge of the central circular opening is welded to the other opening end of the hub, and the upper flange is the same as the lower flange. The upper flange is molded with a resin material having a higher elastic modulus than the resin material of the integrally molded hub and lower flange , and the base material of the resin material of the hub and the resin material of the flange Mother of When bets are no compatibility, and is characterized in that to obtain the weldability by blending a resin having compatibility with at least one resin material.
[0013]
【The invention's effect】
According to the present invention as described above , the bottom wall is formed such that the lower flange and the inner peripheral portion of one end of the hub are closed at one end of the hub made of a cylindrical resin material on which the tape is wound around the outer peripheral surface. : it is molded integrally is connected, the other peripheral edge of the circular opening in the center of the upper flange that are separate molded into the open end of the welded, the upper flange is the same as the lower flange thickness of the hub , and the by the upper flange is molded with resin material with high modulus of elasticity than the resin material of the hub and a lower flange integrally molded increases the strength of the upper flange than the strength of the hub and lower flange, on the can the deformation of the open end portion of the hub that flange and welded suppressed, the outer peripheral edge of the upper flange on the outside at the open end of the hub be wound tape play a significant tape tension fell dramatically toward the center depression open such deformation Can, excellent recording and reproducing characteristics by securing a flange outer rim runout small tape running height accuracy due to the rotation is obtained, and sufficiently adaptable for high capacity.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is a cross-sectional view showing a recording medium tape reel according to one embodiment together with a part of a drive device.
[0015]
The reel 1 includes a cylindrical hub 2 on which a recording media tape (not shown) such as a magnetic tape is wound around an outer peripheral surface 2a, and a radial direction from the outer periphery of one end (downward in the drawing) of the hub 2. A disc-shaped upper flange 4 is integrally molded with a resin material, and a disc-shaped upper flange 4 is molded separately from the resin material at the other end (upper in the figure) of the hub 2 with ultrasonic welding. Being done.
[0016]
That is, the upper flange 4 is provided with a boss portion 4b that protrudes to the periphery of the central circular opening, and this boss portion 4b is fitted on the inner peripheral surface of the open end of the hub 2 so that a welding horn (not shown) The contact surface between the inner peripheral portion of the flange surface 4a and the end surface 2b of the hub 2 is welded by the applied ultrasonic vibration.
[0017]
A bottom wall 5 is connected to the inner peripheral side portion of the hub 2 so as to close the inner peripheral portion of the disc-shaped lower flange 3, and a reel gear for rotationally driving the reel 1 is provided on the outer surface of the bottom wall 5. 6 is engraved in an annular shape, and a reel plate 7 made of an annular metal plate for magnet type attraction is inserted on the inner peripheral side of the reel gear 6 during molding.
[0018]
The reel 1 is wound with a recording media tape and stored in a cartridge case (not shown), and the recording media cartridge is configured such that the reel gear 6 of the reel 1 is exposed from an opening opened on the bottom surface of the case.
[0019]
The drive device 10 includes an annular drive gear 12 and a magnet (not shown) on the upper end surface of the rotary shaft 11, and the chucking operation is performed when a cartridge loaded in a bucket (not shown) is attached to the rotary shaft 11. The drive gear 12 is engaged with the reel gear 6 and the reel plate 7 is attracted by the magnet to maintain the engaged state.
[0020]
The upper flange 4 of the reel 1 is formed of a resin material having an elastic modulus equal to or greater than that of the resin material of the hub 2 and the lower flange 3. Both resin materials are selected from materials having an elastic modulus (strength) corresponding to the tape tension of the recording media tape to be wound and capable of being welded to each other. In particular, the welding side (upper end in the figure) of the hub 2 is opened, and the center of the upper flange 4 is also opened, so that the welding side is more flexible than the integrated hub 2 and lower flange 3. Therefore, the upper flange 4 is preferably made of a resin material having a higher elastic modulus than the resin material of the hub 2.
[0021]
Specific examples of the resin material of the hub 2 and the resin material of the upper flange 4 are shown in Examples 1 to 4 below.
[0022]
< Reference Example 1>
The hub 2 is formed of glass fiber reinforced polycarbonate resin, and the upper flange 4 is formed of glass fiber reinforced polycarbonate resin. The upper flange 4 has an elastic modulus equivalent to that of the hub 2 and can be welded to each other.
[0023]
<Example 1 >
The hub 2 is formed of glass fiber reinforced polycarbonate resin, and the upper flange 4 is formed of carbon fiber reinforced polycarbonate resin. The upper flange 4 has an elastic modulus equal to or higher than that of the hub 2 and can be welded to each other.
[0024]
<Example 2 >
The hub 2 is formed of polycarbonate / ABS alloy resin, and the upper flange 4 is formed of glass fiber reinforced polycarbonate resin. The upper flange 4 has an elastic modulus equal to or higher than that of the hub 2 and can be welded to each other.
[0025]
<Example 3 >
The hub 2 is formed of polyetherimide / polycarbonate resin, and the upper flange 4 is formed of carbon fiber reinforced polycarbonate resin. In this example, the hub 2 and the upper flange 4 have a higher elastic modulus, but the resin base material of the hub 2 and the resin of the upper flange 4 are not compatible, and are compatible on the hub 2 side. Both can be welded by blending the resin.
[0026]
According to the present embodiment (Examples 1 to 3) , the resin material of the upper flange 4 has a higher elastic modulus than the resin material of the hub 2 and the lower flange 3 , and the strength of the upper flange 4 is increased and the reel 1. The strength of the whole 1 is also increased, deformation due to tape winding with a large tape tension accompanying an increase in recording capacity can be reduced, and further, strength reduction and deformation associated with welding between the hub 2 and the upper flange 4 can be suppressed. When the recording medium tape 1 is driven to rotate and the recording media tape travels as the reel 1 rotates, the surface deflection of the upper flange 4 and the lower flange 3 is small, affecting the height position and the like of the traveling recording media tape. This recording media tape runs on the running path of the recording / reproducing apparatus at an accurate height without giving a good recording / reproducing operation at a high recording density, thereby improving the reliability.
[Brief description of the drawings]
FIG. 1 is a sectional view of a reel according to an embodiment of the present invention.
1 reel 2 hub
2a Outer surface
2b End face 3 Lower flange 4 Upper flange
4a Flange surface
4b Boss part 6 Reel gear
10 Drive device
12 Drive gear

Claims (2)

A lower flange made of a disc-shaped resin material and a bottom wall are connected to one end of a hub made of a cylindrical resin material on which the tape is wound around the outer peripheral surface so as to close the inner peripheral portion of the one end of the hub. are integrally molded is, the other open end of the hub, the recording medium reel tape made by welding a flange on which are separately molded by a disk-shaped resin material,
The upper flange has a circular opening in the center, and the peripheral edge of the central circular opening is welded to the other opening end of the hub,
For the recording media tape, wherein the upper flange has the same thickness as the lower flange, and the upper flange is formed of a resin material having a higher elastic modulus than the resin material of the integrally formed hub and lower flange . reel. A lower flange made of a disc-shaped resin material and a bottom wall are connected to one end of a hub made of a cylindrical resin material on which the tape is wound around the outer peripheral surface so as to close the inner peripheral portion of the one end of the hub. are integrally molded is, the other open end of the hub, the recording medium reel tape made by welding a flange on which are separately molded by a disk-shaped resin material,
The upper flange has a circular opening in the center, and the peripheral edge of the central circular opening is welded to the other opening end of the hub,
The upper flange has the same thickness as the lower flange, and the upper flange is molded from a resin material having a higher elastic modulus than the resin material of the integrally molded hub and lower flange , and the mother of the resin material of the hub A reel for a recording media tape, wherein when a material and a base material of the resin material of the flange are not compatible, a compatible resin is blended into at least one resin material to obtain weldability.

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