Tape reel, recording tape cartridge, take-up reel, pullout member, and drive device

Abstract

In a tape reel that includes a hub around which recording tape is wound and flanges disposed on both end portions of the hub, the elastic modulus in a radial direction of the hub is equal to or greater than 16.0 GPa, and the hub includes different radii on one end side thereof and another end side thereof. The recording tape is wound around the hub such that the side where the radius of curvature of the curvature of a tape edge of the recording tape is small corresponds to the small radius side of the hub. When the recording tape is wound around the hub, fluctuation of the recording tape in an axial direction of the hub is controlled, and one-layer protrusion and disorderly winding of the recording tape that has been wound around the hub are controlled.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority under 35 USC 119 from Japanese Patent Application No. 2007-119574, the disclosure of which is incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a tape reel and a take-up reel around which is wound recording tape such as magnetic tape used as a recording and playback medium mainly for computers and the like, a recording tape cartridge where the tape reel is housed inside a case, a pullout member that pulls out the recording tape from the tape reel inside the case, and a drive device into which the recording tape cartridge is loaded.[0004]2. Description of the Related Art[0005]Conventionally, a recording tape cartridge has been known where recording tape such as magnetic tape used as a data recording and playback medium for computers and the like is wound around a reel and the reel is singly housed inside a case. When the recordin...

AI Technical Summary

Benefits of technology

[0015]Thus, in view of the above-described circumstances, the present invention addresses obtaining a tape reel, a recording tape cartridge, a take-up reel, a pullout member and a drive device which, when recording tape has been wound around a hub, can control fluctuation of the recording tape in an axial direction of the hub, can control one-layer protrusion and disorderly winding of the recording tape that has been wound around the hub, can control problems that occur as a result of the one-layer protruding recording tape striking a flange, bending and sustaining tape edge damage when the recording tape cartridge receives a shock such as when the recording tape cartridge is dropped or the like, and can reduce servo signal reading errors and data signal recording and playback errors.

Problems solved by technology

However, in actuality, phenomena such as so-called “one-layer protrusion” occur where, even though the recording tape is supported by tape guides, the recording tape fluctuates in an axial direction (vertical direction) of a hub (winding core portion) during travel, the recording tape that has been wound around the hub becomes disorderly wound, and a portion of the recording tape equal to one circling of the hub protrudes from a winding surface of the recording tape.

When such disorderly winding fluctuates particularly in a short amount of time (when acceleration is large), there is the problem that the recording and playback head, which moves in the vertical direction on the basis of the servo signals that have been prerecorded on the recording tape, becomes unable to follow those abrupt fluctuations in the position of the recording tape and ends up becoming unable to record and play back desired data signals.

Further, when the amount of curvature of the recording tape is large, there is the danger for the recording tape to be caused to excessively move toward one of the flanges and for the tape edge to be strongly pushed against that flange and end up sustaining damage.

That problem becomes pronounced particularly when the recording tape is made thinner.

Further, when the recording tape is strongly pushed too much toward one of the flanges, there is also the danger for the one-layer protrusion phenomenon to occur because of a reaction triggered by this.

For that reason, in this reel, there is the danger for the orderly windability of the recording tape to be impaired and for this to promote tape edge damage.

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