JP2000048529A - Magnetic tape cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the contact area of a magnetic tape for an inner wall surface and to prevent a magnetic tape from being applied to the inner wall surface by providing recessed and projecting parts on the inner wall surface near a tape-leading opening part at the side wall of a cartridge case close to the boundary line of the tape maximum winding diameter side of a tape- running region. SOLUTION: A magnetic tape cartridge made of hard plastic is made of a lower half 3 and an upper half that is overlapped to it and is joined and accommodates a single reel 4 where a magnetic tape 20 is wound. When the cartridge is to be used, the reel 4 can be rotated freely since the drive-releasing member of a recording/reproducing device releases braking. An opening 26 for leading the magnetic tape 20 is formed at one side wall of the cartridge. In a region that is sandwiched by a boundary line L1 at the tape maximum winding diameter side of a tape-running region M and an inner wall 3b of a half close to it, recessed and projecting parts consisting of a plurality of ribs 40 being extended in upper and lower directions are formed on an inner wall close to the opening 26 for leading the magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape in which a single reel on which a magnetic tape is wound is rotatably accommodated in a cartridge case, and a tape draw-out opening is formed in a side wall of the cartridge case. It relates to a cartridge.

[0002]

2. Description of the Related Art Conventionally, a magnetic tape cartridge used as a backup recording medium for computer memory has a single reel wound with a magnetic tape, and this reel is rotatably housed in a cartridge case. Types are known.

[0003] Since important information is stored in the magnetic tape, it is configured so that troubles such as tape jamming do not occur and that the magnetic tape is not inadvertently pulled out.

In this type of magnetic tape cartridge, a lower half having a substantially rectangular planar shape and an upper half having a planar shape similar to the lower half and superimposed on the upper portion of the lower half are screwed together at four corners. And a plastic cartridge case joined by such joining means.

FIG. 8 is a plan view showing an example of the configuration near the tape pull-out opening in the lower half of such a cartridge case.

In the figure, a tape pull-out opening 26 is formed at the end of the side wall 3a of the lower half 3.
On the upper surface of the bottom wall, a concave portion 28 facing the tape drawing-out opening portion 26 is formed. It is configured to be detachably held by a member. L1 indicates a boundary line of the tape running area on the tape maximum winding diameter side, and L2 indicates a boundary line of the tape running area on the tape minimum winding diameter side. An arc-shaped rib 32 is erected outside the reel 4 around which the magnetic tape 20 is wound. Further, near the tape pull-out opening 26, when this magnetic tape cartridge is mounted on a recording / reproducing apparatus. Boss 34 provided with positioning holes (blind holes) 33 used for positioning of screws, and insertion holes (through holes) for upper and lower shell fastening screws
The boss 36 provided with the boss 35 is erected close to the boss 36.

[0007]

In the one-reel type magnetic tape cartridge, unlike the two-reel type magnetic tape cartridge, the pull-out direction of the magnetic tape 20 is the direction A indicated by the arrow at the lower right of FIG. Or, it is often the direction B (the direction C in FIG. 8 for the two-reel type). For this reason, on the tape maximum winding diameter side of the tape running area, as shown by the boundary line L1, the magnetic tape 20 runs close to the side wall 3b of the cartridge case, and a plastic cartridge in which static electricity is likely to be generated. There is a problem that the magnetic tape 20 easily sticks to the side wall 3b of the case. Also, when the magnetic tape 20 is stored, the magnetic tape 20 is stored in a state of being wound on a reel, so that the magnetic tape 20 is also easily stuck to the side wall 3b due to static electricity.

[0008] Therefore, during running, the magnetic tape 20 comes into contact with the side wall 3b, and the magnetic tape 20 is damaged, resulting in inconveniences such as loss of data and inability to record / reproduce data. Further, powder is generated because the magnetic tape 20 scrapes the wall surface of the side wall 3b, which causes dropout. Further, at the time of storage, the component applied to the magnetic tape 20 may react with the resin component of the cartridge case, and the magnetic tape 20 may be adhered to the wall surface of the side wall 3b.

In recent years, since a compact and large-capacity one-reel type backup magnetic tape cartridge has been developed, a tape wound body (wound ball) accommodated in a cartridge case is formed on an inner wall surface of the cartridge case. In addition, the large-capacity type magnetic tape has a low rigidity due to its small thickness of several μm, and tends to be easily affected by static electricity.

In view of such circumstances, the present invention is to prevent the magnetic tape from sticking to the inner wall surface of the cartridge case and to avoid the above-mentioned problems, thereby allowing the magnetic tape to run stably. It is intended for.

[0011]

According to the present invention, a single reel around which a magnetic tape is wound is rotatably accommodated in a cartridge case, and an opening for drawing out a tape is formed in the cartridge case. In the magnetic tape cartridge, irregularities are provided on at least an inner wall surface of the cartridge case near the tape drawing-out opening.

The irregularities can be provided, for example, by forming knurls on the inner wall surface.

[0013] Further, in an area outside the tape running area,
The rib or boss may be provided in the vicinity of the tape pull-out opening in a region sandwiched between a boundary line on the tape maximum winding diameter side of the tape running region and a side wall of the cartridge case adjacent to the boundary line. The goal can be achieved.

Further, the above object can also be achieved by performing an antistatic treatment on at least the sliding portion in the cartridge case near the tape drawing-out opening. This antistatic treatment can be performed by applying an antistatic agent to the surface of the sliding portion, or by forming the sliding portion with a material mixed with an antistatic agent.

[0015]

According to the present invention, at least the inner wall surface of the cartridge case near the tape pull-out opening is provided with
For example, by forming knurls and providing irregularities, the contact area of the magnetic tape on the inner wall surface is reduced,
In addition, since air is interposed between the inner wall surface and the magnetic tape, it is possible to prevent the magnetic tape from sticking to the inner wall surface of the cartridge case.

Therefore, it is possible to avoid inconveniences such as loss of data, inability to record and reproduce data, and occurrence of dropout when the magnetic tape runs. In addition, when the magnetic tape is stored, there is no possibility that the magnetic tape sticks to the inner wall surface of the cartridge case.

Further, by providing ribs or bosses on the inner wall surface of the cartridge case near the tape pull-out opening, these ribs or bosses are also used as ribs or bosses for supporting the locking member of the leader member. When these ribs or bosses are provided integrally with the side wall of the cartridge case, it is possible to prevent the side wall from falling down during molding and to provide the ribs or bosses near the tape drawing opening. Thereby, it is also possible to perform a dustproof function.

Further, by applying an antistatic treatment to at least a sliding portion, for example, a sliding door, in the vicinity of the tape drawing-out opening in the cartridge case, generation of static electricity due to sliding can be prevented. It is possible to prevent the magnetic tape from sticking to the inner wall surface of the cartridge case.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing the configuration of an embodiment of a magnetic tape cartridge according to the present invention, and FIG. 2 is a perspective view of a main part of the cartridge case of FIG. 1 with a part cut away.

As shown in FIG. 1, a magnetic tape cartridge 1 has a lower half 3 having a rectangular planar shape and an upper half which has a planar shape similar to the lower half 3 and is superimposed on the upper portion of the lower half 3. 2 is provided with a flat hard plastic cartridge case 7 which is joined to each other at four corners by joining means such as screws, and a single reel 4 on which a magnetic tape 20 is wound in the cartridge case 7. Are rotatably accommodated.

The reel 4 has a configuration in which a lower reel 5 and an upper reel 6 are joined by ultrasonic welding.
Is formed by integrally molding a cylindrical reel hub 23 around which the magnetic tape 20 is wound around the outer periphery and a flange portion 24 projecting radially from the outer periphery of the lower end of the reel hub 23 using a synthetic resin. A reel plate 8 is attached to the bottom outer surface of the reel hub 23 for joining a magnetic rotary drive unit for driving the reel 4 to rotate. On the inner surface of the bottom of the reel hub 23, a brake button 9 is provided. A stopping gear 23A that is engaged with the gear 9A for restraining rotation when not in use is provided. An opening 23B is formed in the reel hub 23, through which a drive release spindle provided in an external recording / reproducing apparatus using the magnetic tape cartridge 1 is inserted, and the brake button 9 is moved upward.

The brake button 9 is formed with the above-mentioned stopping gear 9A on the side facing the reel hub 23, and the brake guide projection formed on the upper half 2 is fitted on the opposite side. The fitting groove 9B to be formed is formed. When cartridge is not used, brake button 9
Is mounted inside the reel hub 23 in a state where it is urged downward by a coil spring 10 in the figure, and the brake button 9
The stop gears 9A and 23A of the reel 4 and the reel hub 23 are engaged with each other to prevent the rotation of the reel 4. On the other hand, when the cartridge is used, the drive release spindle of the recording / reproducing apparatus presses the brake button 9 to move the brake button 9 upward in the drawing against the urging force of the coil spring 10, whereby the stopping gears 9A, The engagement of 23A is released, and the reel 4 becomes rotatable.

An opening 26 for drawing out the magnetic tape 20 is formed on one side wall of the cartridge case 7. A slide door 27 that is movable in the direction of arrow A parallel to the side wall of the cartridge case 7 is attached to the opening 26. The slide door 27 is formed by a spring (not shown).
The opening 26 is urged in the closing direction.

When the magnetic tape cartridge 1 is not used, the magnetic tape 20 is completely wound around the reel 4, and a leader means such as a leader pin 21 attached to the end of the magnetic tape 20 is provided in the opening 26. It is locked in a recess 28 formed in the vicinity.

The above-mentioned leader pin 21 is used for the recording / reproducing apparatus using the magnetic tape cartridge 1 to hold and pull in the magnetic tape 20 through the opening 26 in order to introduce the magnetic tape 20 into the tape running path in the apparatus. A spring member 42 (see FIGS. 2 and 7) as a locking member that is detachably held in the concave portion 28 is provided.

When the magnetic tape cartridge 1 is set in the corresponding external recording / reproducing apparatus, the locking of the brake gears 9A, 23A between the brake button 9 and the reel hub 23 is released as described above, and the reel 4 Are rotatable, and the magnet type rotation driving means is joined to the reel plate 8 to rotate the reel 4. At the same time, the slide door 27 is opened, the leader pin 21 is pulled into a predetermined position on the tape traveling path, and data can be read from and written to the magnetic tape 20.

One corner 7 in the cartridge case 7
A is a non-contact type memory element (Memory In Cartridg) for recording the content of information recorded on the magnetic tape 20 and the like.
e, hereinafter referred to as MIC) 30 is attached. Here, the MIC 30 is formed of a rectangular plate-like member, and can read and write information in a non-contact manner by a method such as electromagnetic induction.

In the cartridge case 7, arc-shaped ribs 31 coaxially surrounding the magnetic tape 20 wound on the reel 4 are protruded from the top wall of the upper half 2 and the bottom wall of the lower half 3. A knurl R is engraved on the inner wall surface of the rib 31. Furthermore, the cartridge case 7
Also on the inner wall surface of the side wall near the tape drawing opening 26 of
As shown in FIG. 2, knurls R are engraved.

As described above, in the present embodiment, the rib 31
Also, by forming the knurls R on the inner wall surface of the side wall near the tape pull-out opening 26, it is possible to prevent the magnetic tape 20 from sticking to the inner wall surface of the cartridge case 7 due to static electricity.

Further, the above-mentioned object is also achieved by performing an antistatic treatment on a sliding portion near the tape lead-out opening 26, such as the sliding door 27 or the sliding portion of the leader pin 21 on the inner wall surface of the cartridge case 7. can do. This antistatic treatment can be performed by applying an antistatic agent to the surface of the sliding portion, or by forming the sliding portion with a material mixed with an antistatic agent.

FIG. 3 shows another embodiment of the present invention.
FIG. 4 is a plan view of a main part of the lower half corresponding to FIG. 8, and FIG. 4 is a schematic perspective view of a main part of the lower half of FIG. FIG. 5 is a schematic sectional view of a main part of the cartridge case.

In this embodiment, a plurality of ribs 40 extending in the vertical direction are provided on the inner wall surface of the side wall (2b for the upper half 2, 3b for the lower half 3) of the cartridge case 7.
Projections are provided at predetermined intervals along 3b. These ribs 40 are provided in the tape running area M between the boundary lines L1 and L2.
For drawing out the tape in a region outside the tape running region M and between the boundary line L1 on the tape maximum winding diameter side of the tape running region M and the side walls 2b, 3b of the cartridge case 7 close to the boundary line. It is provided near the opening 26.

FIG. 3 is the same as FIG. 8 except that a rib 40 is provided.
The same reference numerals are given to members corresponding to, and duplicate description is omitted.

In this embodiment, the provision of the ribs 40 allows the side walls 2b, 3 of the cartridge case 7 to be provided.
b can be prevented from sticking to the magnetic tape 20.

FIG. 6 is a schematic sectional view of a main part of the cartridge case showing a modification of FIG. 5 corresponding to FIG.

In FIG. 6, a boss 41 is formed on the side wall 2 from the top wall of the upper half 2 and the bottom wall of the lower half 3 of the cartridge case 7.
b and 3b are provided along the inner wall surface. These bosses 41 are also provided in a region outside the tape running region M, similarly to the ribs 40, and are also provided on a boundary line L1 on the tape maximum winding diameter side of the tape running region M and on the cartridge case 7 close to the boundary line. It is provided near the tape pull-out opening 26 in a region sandwiched between the side walls 2b and 3b. These bosses 41 also allow the cartridge case 7
It is clear that the sticking of the magnetic tape 20 to the side walls 2b and 3b of the magnetic tape can be prevented.

FIG. 7 shows a configuration in which a rib or a boss is also used as a rib or a boss for fixing a member for locking the leader pin 21. That is, in this case, as shown in FIGS. 1 and 2, the leader pin 21 attached to the end of the magnetic tape 20 is detachably and elastically engaged with the upper and lower ends thereof. Are attached to the upper and lower halves 2 and 3 respectively so as to face the tape pull-out opening 26. In the configuration shown in FIG. 7, the root of the spring member 42 is formed by a rib 40 having a hook-like cross-sectional shape. The spring member 42 is locked in the gap between the boss 41 and the inner wall surface of the side wall 3b.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the cartridge case of FIG. 1 with a part cut away.

FIG. 3 is an enlarged plan view of a main part of a lower half according to another embodiment of the present invention.

FIG. 4 is a schematic perspective view of a main part of a lower half of FIG. 3;

FIG. 5 is a sectional view of a main part of a cartridge case using the lower half of FIGS. 3 and 4;

FIG. 6 is a sectional view of a main part of the cartridge case showing a modification of FIG. 5;

FIG. 7 is an enlarged plan view of a main part of a lower half showing still another embodiment of the present invention.

FIG. 8 is an enlarged plan view of a main part of a lower half of a conventional cartridge case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic tape cartridge 2 Upper half 2b Upper half side wall 3 Lower half 3b Lower half side wall 4 Reel 7 Cartridge case 26 Magnetic tape draw-out opening 40 Rib 41 Boss 42 Spring member (locking member) L1 Tape running area Boundary line on the maximum tape diameter side L2 Boundary line on the minimum tape diameter side of the tape running area M Tape running area R Knurl

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yusuke Ishihara 2-2-1-1, Ogimachi, Odawara-shi, Kanagawa Prefecture Inside Fuji Photo Film Co., Ltd. (72) Inventor Hideaki Shiga 2-1-1, Ogimachi, Odawara-shi, Kanagawa Prefecture Fuji Photo Film Co., Ltd.

Claims (3)

[Claims] 1. A magnetic tape cartridge in which a single reel on which a magnetic tape is wound is rotatably accommodated in a cartridge case, and a tape drawing opening is formed in the cartridge case. A magnetic tape cartridge characterized in that at least the inner wall surface near the tape drawing-out opening has irregularities. 2. The tape in an area outside the tape running area and sandwiched between a boundary line on the tape maximum winding diameter side of the tape running area and a side wall of the cartridge case close to the boundary line. 2. The magnetic tape cartridge according to claim 1, wherein a rib or a boss is provided near the drawer opening. 3. A magnetic tape cartridge in which a single reel around which a magnetic tape is wound is rotatably accommodated in a cartridge case, and a tape drawing opening is formed in the cartridge case. A magnetic tape cartridge characterized in that at least a sliding portion near the tape drawing-out opening is subjected to an antistatic treatment.