JPS593418Y2 - tape reel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape reel on which a magnetic tape is wound for use in a magnetic recording/reproducing device such as a video tape recorder.

In recent years, magnetic recording and reproducing devices that use a tape cassette in which a magnetic tape is housed in a cassette case are rapidly becoming popular.

In the tape cassette mentioned above, there is a structural limit to the storage space for the magnetic tape, so in order to be able to use it for long periods of recording (playback) while maintaining its compact size, the thickness of the magnetic tape must be extremely thick. By making it thinner,
A long magnetic tape must be stored in the storage space.

Hereinafter, the magnetic tape whose thickness has been reduced as described above will be referred to as a thin magnetic tape.

Here, in the conventional video cassette used in a cassette type video tape recorder, for example,
A magnetic tape 2 wound around a tape reel 1 having a structure as shown in FIG. 1 is housed in a cassette case (not shown).

In FIG. 1, a tape reel 1 includes a reel hub 3 as a winding shaft for a magnetic tape 2, a lower reel flange 4 extending from the lower edge of the reel hub 3, and a lower reel flange 4 extending parallel to the lower reel flange 4. an upper reel flange 5 fixed to the upper edge of the reel hub 3;
The structure is such that the positions of the edges 2a and 2b of the magnetic tape 2 wound around the magnetic tape 2 are regulated by the opposing surfaces 4a and 5b of the flanges 4 and 5, respectively.

By the way, thin magnetic tape has a low stiffness of the tape itself, so the so-called stiffness of the tape is weak.
If a tape reel 1 as described above is used, the tape reel 1 may be wound around the reel flange 3 with its lower edge 2a curved, as shown in FIG. There is a risk of it being damaged.

When the magnetic tape 2 wound with the lower edge 2a curved in this way is unwound from the tape reel 1, the third
As shown in the figure, the lower edge 2a becomes so-called seaweed-like, resulting in poor contact with the magnetic head of the magnetic recording/reproducing device, making it impossible to use it for recording/reproducing.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention aims to provide a tape reel with a structure that allows even thin magnetic tape to be wound reliably without damage.

Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment.

An exploded perspective view of an embodiment of the tape reel according to the present invention is shown in FIG. 4, and a longitudinal sectional front view of the assembled state is shown in FIG.

In this embodiment, the reel hub 11. In the tape reel 10 consisting of the upper flange 12 and the lower flange 13, the flange interval T on the reel hub 11 side portion is approximately 7 or less of the maximum winding diameter R of the magnetic tape 20 to be wound, and the flange interval t on the outer peripheral side portion is approximately 7 or less. , each opposing surface 12a, 13a is formed on the outer circumferential side of each of the reel flanges 12, 13 so that the width is larger than the flange spacing T on the outer circumferential side part, that is, the reel hub side part is wide and the outer circumferential side part is narrow.
It has a structure in which ring-shaped protrusions 14 and 15 are formed, respectively, protruding toward.

Here, each opposing surface 12 a, 13 a formed by each of the protrusions 14.15 is the opposing surface 12 a,
13 Inclined surfaces 16° and 17, each at an angle of 0° with respect to a
The flange 12.73 is smoothly connected to each opposing surface 12b, 13b on the reel hub 11 side via the flange 12.73.

Each of the above protrusions 14.15 is connected to each reel flange 12°13
By providing them on the outer circumferential side, ring-shaped concave spaces 18 and 19 are respectively formed on the reel hub 11 side.

Therefore, in the embodiment of the structure described above, when winding the thin magnetic tape 20 with small stiffness, tape running failure due to insufficient tension may occur when starting the magnetic recording/reproducing apparatus, etc. Even if the magnetic tape 20 is wound while the tape edge 201 portion is in contact with the facing surface 13a of the outer peripheral subdivision of the flange 13, the flange interval t on the reel hub 11 side is changed to the flange interval T on the outer peripheral side.
Since the edge 203 of the magnetic tape 20 wound around the reel hub 11 is not curved as shown in FIG. In this position, tape winding is performed.

Therefore, even a thin magnetic tape 20 can be wound correctly on such a tape reel 10 without causing damage.

Here, each opposing surface 13a of the lower flange 13.

13b is smoothly continuous via the inclined surface 17, so that when winding and unwinding the magnetic tape 20, the position of the tape edge 20a is regulated by the facing surface 13a on the outer peripheral side of the lower flange 13. You can do it right.

Note that it is possible to prevent tape edge curvature by simply widening the flange spacing, but doing so poses a problem in regulating the tape edge position using the reel flange, and also prevents tape reel bending. There is a drawback that the shape has to be enlarged.

Further, since the tape cassette is normally used in a horizontal position, providing the protruding portion 15 only on the lower flange 13 can provide a sufficient effect.

As is clear from the description of the embodiments described above, according to the present invention, in a tape reel consisting of an upper reel flange, a lower reel flange, and a reel hub that are parallel to each other, the distance between the opposing inner surfaces of the upper and lower reel flanges is By making the reel hub side wider and the outer circumferential side narrower around half of the maximum winding diameter of the magnetic tape being wound, the tape edge can be curved even when thin magnetic tape has small stiffness. We can provide tape reels that are ideal for tape cassettes, which can be wound correctly without causing damage, and which are desired to enable long-term recording and playback by using thin magnetic tape. can be a distant relative of the purpose of

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing a tape reel conventionally used in a video cassette, FIG. The figure is a plan view of the thin magnetic tape wound around the tape reel in a state in which it has been rewound. FIG. 4 is an exploded perspective view showing an embodiment of the tape reel according to the present invention, FIG. 5 is a longitudinal sectional front view of the assembled state, and FIG. 6 is an enlarged sectional view of the main parts showing the magnetic tape wound state. It is a diagram. 10... Tape reel, 11... Reel hub, 12
...Upper reel flange, 13...Lower reel flange, 12a. 12 b, 13 a, 13 b... Reel flange facing surface, 14° 15... Protrusion, 16.17...
- Inclined surface, 18.19... Concave space, 2D... Magnetic tape.

Claims (1)

[Scope of utility model registration request] In a tape reel consisting of an upper reel flange, a lower reel flange, and a reel hub that are parallel to each other, the distance between the opposing inner surfaces of the upper and lower reel flanges is approximately half the maximum winding diameter of the magnetic tape to be wound. A tape reel characterized in that the reel hub side part is wide and the outer peripheral side part is narrow.