JPH0543373U - Magnetic tape cartridge - Google Patents

Abstract

(57) [Abstract] [Purpose] The transfer phenomenon as described above due to the step formed at the joining portion of the magnetic tape and the leader tape is prevented, and an error such as a sound jump may occur during reproduction of the magnetic tape. Providing no magnetic tape cartridges. [Composition] A base end of a leader tape whose base end is locked to a spool locking part is joined to a base end of a magnetic tape,
In a magnetic tape cartridge in which the magnetic tape is wound on a spool, the end portion of the leader tape and the base end portion of the magnetic tape are superposed, and the superposed portion is joined by thermocompression bonding. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic tape cartridge, and more particularly, to a magnetic tape cartridge that is free from the risk of jumping sound or the like when reproducing a magnetic tape.

[0002]

[Prior art]

 In a general magnetic tape cartridge, the base end of the magnetic tape 2 wound around a spool is joined to the end of the leader tape 3 by an adhesive tape T as shown in FIG. The end portion is locked to the spool locking portion using a locking piece. Then, a vertical groove-shaped gap formed between the locking piece and the end of the spool locking portion sequentially affects the magnetic tape wound on the transfer phenomenon (contacts the gap or the step portion). A groove-like trace is generated on the magnetic tape due to the gap or the step, and the trace is easily transferred to each laminated portion of the magnetic tape wound and laminated on the spool). To prevent such a transfer phenomenon, there is a magnetic tape cartridge disclosed in Japanese Utility Model Publication No. 52-23315.

As shown in FIG. 6, the magnetic tape cartridge described in Japanese Utility Model Publication No. 52-23315 is press-fitted together with a locking piece 7 into a spool locking portion (recess) 5 provided on the outer periphery of the spool 1. When the magnetic tape 2 is wound around the spool 1 by the adhesive tape T that joins the distal end 32 of the leader tape 3 and the proximal end 21 of the magnetic tape 2 locked by the above-mentioned FIG. As shown in FIG. 5, the spool tape is arranged so as to face the spool engaging portion 5 so as to avoid the transfer phenomenon caused by the gap 6 by the adhesive tape T.

[0004]

[Problems to be solved by the device]

 However, in the above magnetic tape cartridge, as shown in FIG. 6, the magnetic tape 2 wound around the spool 1 at both ends of the adhesive tape T, that is, at the connecting portion 4 of the magnetic tape 2 and the leader tape. Steps 10 and 10 are generated on the upper side, and the transfer phenomenon as described above occurs due to the steps 10 and 10, which may cause an error of the magnetic tape 2.

Therefore, an object of the present invention is to prevent the above-described transfer phenomenon due to a step difference occurring at the connecting portion between the magnetic tape and the leader tape, and to cause an error such as a sound jump when reproducing the magnetic tape. The purpose of the present invention is to provide a magnetic tape cartridge that is free from the risk of

[0006]

[Means for Solving the Problems]

 The present invention relates to a magnetic tape cartridge in which a distal end portion of a leader tape whose base end portion is locked by a spool locking portion and a base end portion of a magnetic tape are combined and the magnetic tape is wound around a spool. The present invention achieves the above object by providing a magnetic tape cartridge in which the distal end portion of the leader tape and the proximal end portion of the magnetic tape are superposed and the superposed portion is joined by thermocompression bonding. It was done.

[0007]

[Action]

 According to the magnetic tape cartridge of the present invention, the end portion of the leader tape and the base end portion of the above magnetic tape are superposed, and the superposed portion is joined by thermocompression bonding, so that there is substantially a step in the joint portion. Since it does not occur, there is no possibility that a transfer phenomenon due to a step will occur in the magnetic tape wound and laminated on the spool, and there is no risk of an error such as jumping of sound when the magnetic tape is reproduced.

[0008]

【Example】

 An embodiment of the magnetic tape cartridge of the present invention will be described below with reference to the drawings. 1 is a plan view showing a main part of an embodiment of a magnetic tape cartridge of the present invention, a plan view of a spool portion in which magnetic tape is wound and laminated, and FIG. 2 is a magnetic tape in the embodiment shown in FIG. It is sectional drawing which expands and shows the joint part of a leader tape.

In the magnetic tape cartridge of this embodiment, as shown in FIG. 1, the base end portion 31 of the leader tape 3 is locked to the spool lock portion 5 and the base end portion 21 of the magnetic tape 2 is locked. The point that the magnetic tape 2 is wound around the spool 1 by coupling with the above is similar to the conventional product of this type. Thus, in the magnetic tape cartridge of this embodiment, as shown in FIG. 2, the end portion 32 of the leader tape 3 and the base end portion 21 of the magnetic tape 2 are superposed, and the superposed portion is heated. They are joined by crimping. The end portion of the magnetic tape 2 is bonded to the end portion of a leader tape (not shown) locked to the other spool (not shown) in the same manner as described above by thermocompression bonding as described above. There is.

The above-mentioned “bonding by thermocompression bonding” means that the overlapping portion of the end portion 32 of the leader tape 3 and the base end portion 21 of the magnetic tape 2 is heated and softened by an appropriate heating means (ultrasonic wave). (Including the case according to 1.), the softened overlapping portion is pressed and compressed from both the upper and lower sides by a pressing means, so that both tapes are compression-bonded at the overlapping portion.

The magnetic tape cartridge of the present embodiment will be further described. As shown in FIG. 2, the thickness of the connecting portion 4 between the leader tape 3 and the magnetic tape 2 is set to the thickness of the magnetic tape 2 and the leader tape 3. And is substantially the same. An example of the joining method by thermocompression bonding in the magnetic tape cartridge of this embodiment will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a sectional view showing a state of the overlapping portion immediately before being joined by thermocompression bonding, and FIG. 4 is a sectional view showing a state of the overlapping portion shown in FIG. 3 immediately after being joined by thermocompression bonding. In carrying out this coupling example, first, as shown in FIG. 3, the distal end portion 32 of the leader tape 3 to be thermocompression bonded and the proximal end portion 21 of the magnetic tape 2 are superposed on the workbench 8 and superposed. The end portions 32 and 21 are heated and softened to a predetermined temperature by irradiating the portion with ultrasonic waves by a heating device (not shown). Then, the pressing tool 9 arranged above the overlapping section is lowered, and the overlapping section is compressed between the work table 8 and the pressing tool 9 with a predetermined pressing force. By this compression, each end 32, 21 of the softened overlapped portion is plastically deformed and flattened, and the two tapes 2 and 3 are bonded at their contact surfaces. As a result, as shown in FIG. 4, the magnetic tape 2 and the leader tape 3 are joined by the joining portion 4 having a thickness substantially the same as their thickness.

In the magnetic tape cartridge of the present embodiment configured as described above, since there is substantially no step difference in the coupling portion 4, the magnetic tape 2 wound around the spool 1 has a transfer phenomenon due to the step difference. Therefore, there is no fear that an error such as a sound jump will occur when the magnetic tape is reproduced. Further, in the magnetic tape cartridge of the present embodiment, as shown in FIG. 1, the length of the leader tape 3 is set longer than the length of one round of the spool 1. With this structure, the leader tape 3 covers the gap 6 formed between the locking piece 7 and the end of the spool locking portion 5, so that the gap 6 does not directly contact the magnetic tape 2, The effect of preventing the transfer phenomenon can be improved.

Further, in the magnetic tape cartridge of the present embodiment, the height of the locking piece 7 on the side in contact with the base end portion 31 of the leader tape 3 is set to the above from the depth dimension of the spool locking portion (recess) 5. The thickness of the leader tape 3 is reduced. As a result, the upper surface of the base end portion 31 of the leader tape 3 that covers the locking piece 7 is at the same height as the outer peripheral surface of the adjacent spool 1, so that the leader tape 3 that goes around the spool 1 has no step. It is wound on the above-mentioned base end portion 31. The height of the locking piece 7 is the same as the outer peripheral surface of the spool 1 at the end portion of the leader tape 3 facing the base end portion 31, and the height of the locking piece 7 between them is the same. , The leader tape 3 is gradually raised from the base end 31 side. With this structure, no step is formed on the locking piece 7 and the leader tape 3 wound around the outer circumference of the spool 1, so that the transfer phenomenon is reliably prevented.

The present invention is not limited to the above embodiment, but in the above embodiment, the thickness of the connecting portion 4 between the leader tape 3 and the magnetic tape 2 is substantially the same as the thickness of the magnetic tape 2 and the leader tape 3. Although it is assumed that they are the same, if the overlapping portions are joined by thermocompression bonding, there is no substantial difference in the joining portion even if the joining portion is a little thick. To be achieved.

[0016]

[Effect of the device]

 In the magnetic tape cartridge of the present invention, since there is substantially no step at the connecting portion between the leader tape and the magnetic tape, there is no risk of a transfer phenomenon due to the step on the magnetic tape wound around the spool, and the magnetic tape There is no risk of error such as jumping of sound when playing a tape. In addition, the cost of manufacturing is reduced because the bonding process using the adhesive tape, which has poor workability, which was used in the conventional manufacturing of magnetic tape cartridges is eliminated.

[Brief description of drawings]

FIG. 1 is a plan view showing a main part of an embodiment of a magnetic tape cartridge of the present invention.

FIG. 2 is an enlarged sectional view showing a joint portion between a leader tape and a magnetic tape in the embodiment shown in FIG.

FIG. 3 is a cross-sectional view showing a state immediately before forming the joint portion shown in FIG. 2 by thermocompression bonding.

FIG. 4 is a cross-sectional view showing a state immediately after the joint portion shown in FIG. 2 is formed by thermocompression bonding.

FIG. 5 is a cross-sectional view showing, in an enlarged manner, a joining portion of a leader tape and a magnetic tape by an adhesive tape in a conventional magnetic tape cartridge.

FIG. 6 is a view corresponding to FIG. 1 in a conventional magnetic tape cartridge.

[Explanation of symbols]

 1 Spool 2 Magnetic tape 21 Base end part of magnetic tape 3 Leader tape 31 Base end part of leader tape 32 End part of leader tape 4 Coupling part 5 Spool locking part

Claims (2)

[Scope of utility model registration request] 1. A magnetic tape cartridge in which a distal end portion of a leader tape whose base end portion is locked to a spool locking portion and a base end portion of a magnetic tape are coupled to each other, and the magnetic tape is wound around a spool. A magnetic tape cartridge characterized in that the end portion of the leader tape and the base end portion of the magnetic tape are overlapped with each other, and the overlapped portion is joined by thermocompression bonding. 2. The magnetic tape cartridge according to claim 1, wherein the thickness of the joining portion between the leader tape and the magnetic tape is substantially the same as the thickness of the magnetic tape and the leader tape.