JPH0969269A - Tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape cassette which lightens stress to a tape resulting from a step difference between an engagement recess of a hub and a clamper and decreases an error rate. SOLUTION: In this cassette, a base end part 4a of a leader tape 4 is engaged between an engagement recess part 2 recessed in the outer periphery of a hub 1 and a clamper 3 fitted in the recess part 2. At this time, the leader tape 4 has such a length as can be wound around the hub a plurality of number of times. The leader tape is layered on an outer surface of the hub after wound around the hub a predetermined number of times. A leader tape 4b of the uppermost layer of the layered tape is fixed to a leader tape 4c of an inner layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette, and more particularly to a tape cassette in which an error caused by a step between a hub and a clamper is reduced.

[0002]

2. Description of the Related Art In a general tape cassette, the base end of a magnetic tape wound around a hub is joined to the end of a leader tape.
As shown in FIG.
04a is locked between the locking recess 102 formed in the outer periphery of the hub 101 and the clamper 103 fitted therein.

However, in the above tape cassette, a step is formed between the locking recess 102 of the hub 101 and the clamper 103, so that excessive stress is applied to the tape at this step, causing an error. It was. Especially in the case of digital recording, data loss such as burst error may occur and error correction may be impossible.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a tape cassette in which the stress on the tape due to the step between the locking recess of the hub and the clamper is reduced and the error rate is reduced.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a base end portion of a leader tape is provided between a locking recess formed in the outer periphery of a hub and a clamper fitted in the locking recess. In the locked tape cassette, the leader tape is
The hub has a length capable of being wound a plurality of times, is wound on the hub a predetermined number of times and is laminated on the outer surface of the hub,
The above object is achieved by providing a tape cassette in which the leader tape of the uppermost layer of the laminated portion is fixed to the leader tape of the inner layer.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the tape cassette of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded plan view showing a main part of one form of the tape cassette of the present invention.

As shown in FIG. 1, the tape cassette of the present embodiment has a locking recess 2 formed in the outer periphery of the hub 1 and a clamper 3 fitted in the locking recess 2. The base end portion 4a of the leader tape 4 is locked. These points are
This is similar to a conventional tape cassette of this type. The leader tape 4 is connected to the metal tape 6 via a splicing tape 5.

In the tape cassette of this embodiment, the length of the leader tape 4 is such that the hub 1 can be wound a plurality of times, and the leader tape 4 is attached to the hub 1 a predetermined number of times. It is wound and laminated on the outer surface of the hub 1, and the uppermost leader tape 4b of the laminated portion 10 is fixed to the inner leader tape 4c.

More specifically, the leader tape 4 mentioned above.
Is required to be long enough to be able to wind the hub a plurality of times in addition to the usual prescribed length.
If the tape cassette is a DAT cassette,
In addition to the length of a normal leader tape, a length that allows the hub 1 to be wound a predetermined number of times is required.

The leader tape 4 is attached to the hub 1.
The above predetermined number of times of winding is arbitrary depending on the thickness of the leader tape 4 and the kind of tape cassette, but it is wound until the step between the hub 1 and the clamper 3 becomes less than or equal to the thickness of the metal tape 6. For example, when the tape cassette is DAT, it is preferably wound 2 to 100 times, more preferably 2 to 20 times.

The leader tape 4 is laminated on the outer surface of the hub 1 by the winding, and the leader tape 4b, which is the uppermost layer of the laminated portion, is attached to the inner leader tape 4c, and the fixing portion 7 is formed. It is fixed through. Note that FIG. 1 illustrates a state before fixation for convenience of description. The fixing portion 7 is not particularly limited, but an acrylic adhesive, an SBR adhesive, an epoxy adhesive,
It can be formed by an adhesive such as a cyanoacrylate adhesive, an acrylic resin, a double-sided tape using an SBR resin, or the like. Further, it is preferable that the fixing portion 7 is provided so that the distance from the end of the adhesive portion to the end of the metal tape is 60 ± 5 mm in the case of DAT, and the thickness thereof is 30 μm or less. Is preferred.

Since the tape cassette of this embodiment is constructed as described above, the stress on the tape at the step is reduced, and the error rate is reduced.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the fixing means of the fixing portion is not limited to the adhesive / double-sided tape, and examples thereof include means such as ultrasonic welding.

The tape cassette of the present invention is a DA
In addition to T, 8 mm video tape, etc., it is suitable as a cassette tape for storing data in a computer.

[0015]

According to the tape cassette of the present invention, the stress on the tape due to the step between the locking recess of the hub and the clamper is reduced, and the error rate is reduced.

[Brief description of drawings]

FIG. 1 is an exploded plan view showing a main part of one form of a tape cassette of the present invention.

FIG. 2 is an exploded plan view of a tape cassette showing a locked state of a tape in a conventional hub.

[Explanation of symbols]

 1 hub 2 locking recess 3 clamper 4 leader tape 5 splicing tape 6 metal tape 7 fixed part

Claims (1)

[Claims] 1. A locking recess formed in the outer periphery of the hub,
In a tape cassette in which a base end portion of a leader tape is engaged with a clamper fitted in the engagement recess, the leader tape has a length capable of winding the hub a plurality of times. The tape cassette is wound around the hub a predetermined number of times and is laminated on the outer surface of the hub, and the leader tape of the uppermost layer of the laminated portion is fixed to the leader tape of the inner layer. .