JPH10162544A - Tape reel and tape cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent single side elongation of a magnetic tape which has been generated due to deformation of the external hub of a lower reel owing to winding pressure of the tape in regard to a tape reel for winding the magnetic tape. SOLUTION: In a tape reel 1 in which the lower reel 4 and upper reel 7 respectively having disc type flanges 3, 6 are assembled and the magnetic tape 12 is wound around a cylindrical hub 2 of the lower reel, the cylindrical hub 2 is formed of an external hub 2b which becomes a winding surface of the magnetic tape 12 and an internal hub 2a having an engaging section 10 which is arranged to have the gap 2c at the internal side of the external hub to be engaged with the pawl of the reel base of a magnetic recording/reproducing apparatus. At the gap 2c between the external hub 2b and internal hub 2a, a radial rib 11 is provided to couple both hubs and the upper end portions of both external and internal hubs are integrally coupled with each other by means of a disc type coupling portion 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tape reel on which a magnetic tape is wound and a tape cassette equipped with the tape reel.

[0002]

2. Description of the Related Art Conventionally, a video tape recorder (VT)
R) and the magnetic tape for magnetic recording and reproduction
The tape reel is wound around a pair of tape reels including an upper reel and a lower reel, and the tape reel is housed in a tape cassette formed by assembling an upper half and a lower half.

FIG. 3 shows the structure of a conventional general tape reel on which the magnetic tape is wound. The lower reel 4a constituting the tape reel 1a has a generally cylindrical hub 2
And a downhole flange 3 connected to a lower portion of the hub 2. The cylindrical hub 2 has an inner hub 2a formed by equally arranging, in the inner circumferential direction, claws 10 in which the claws of the reel stand of the VTR mesh with inner circumferential wall surfaces having both ends opened, and a radius from a lower portion of the inner hub 2a. And a cylindrical outer hub 2b integrally formed with a predetermined gap 2c outside the inner hub 2a via a connecting portion A extending in the direction.

A gap 2c between the inner hub 2a and the outer hub 2b
In order to prevent sinking of the lower reel 4a, to make the thickness uniform, and to prevent deformation of the outer hub 2b serving as a winding surface on which the magnetic tape is wound, a plurality of reinforcing ribs 11 are provided. They are provided radially at predetermined intervals.

On the other hand, an upper reel 7a is fitted inside the outer hub 2b, and is connected to the inner hub 2a in a ring-like connecting portion 5a. An upper reel flange is provided on the upper end of the connecting portion 5a. 6 are provided integrally.

[0006] A reel plate 8 is mounted on the upper portion of the inner hub 2a of the lower reel 4a by a spring action to prevent the VTR from rattling with the reel base, and the upper reel 7a is assembled thereon. The upper end of 2a and the ring-shaped connecting portion 5a are connected by connecting means such as ultrasonic welding or caulking,
The tape reel 1a is formed by assembling the upper reel 7a and the lower reel 4a integrally.

As shown in FIG. 5, between the upper end surface of the outer hub 2b of the lower reel 4a and the lower surface of the upper reel flange 6 of the upper reel 7a, and between the outer hub 2b and the connecting portion 5a. About 0.3 as clearance required for assembly
A gap b of about 0.5 mm and a gap c of about 0.5 to 1.5 mm are provided. The magnetic tape 12 is wound around the outer hub 2b of the tape reel 1a thus configured.

[0008]

However, when the magnetic tape 12 is wound around the tape reel 1a, in the case of a long magnetic tape, the winding pressure increases as the number of windings increases, and the tape reel 1a When a large compressive force is applied to the outer hub 2b, the magnetic tape 12 gradually contracts when it is stored in a wound state for a long time in an unused state, or when there is a change in the environment such as a temperature change, the magnetic tape 12 gradually contracts. When the winding pressure of the tape 12 further increases, the outer hub 2b of the tape reel 1a is often deformed so as to fall from the regular position shown by the phantom line to the inside of the cylinder.

That is, the outer hub 2b is provided with reinforcing ribs 11 for reinforcement between the outer hub 2b and the inner hub 2a, but the upper end of the outer hub 2b is further higher than the upper end of the inner hub 2a. As shown in FIG. 5, since the upper end of the outer hub 2b is not reinforced with respect to the force in the axial direction as shown in FIG. Has become.

Further, the lower end of the outer hub 2b is integral with the lower reel flange 3, and is connected to the lower end of the inner hub 2a by a connecting portion A therearound. The resistance to the winding pressure is increased and there is no fear of deformation.

Therefore, the outer hub 2b of the tape reel 1a
The upper end of the tape is inclined inward, and the magnetic tape 1
6 deforms following this deformation, and as shown in FIG. 6, the edge 12a wound on the lower end side of the outer hub 2b expands and spreads, and becomes a wakame shape by so-called one-sided stretching. .

In the case of the magnetic tape 12 which has become unilaterally stretched into a wakame-like shape, when a recording / reproducing operation is performed by a VTR, the contact of the rotating magnetic head on the rotating drum is caused by the extended edge 12 a of the magnetic tape 12. become weak. As a result, it is difficult to obtain the output of the extended edge 12a of the magnetic tape 12 due to one end of the rotating magnetic head, and there is a disadvantage that the error rate is deteriorated. As described above, the conventional tape reel has a problem to be solved in correspondence with the winding pressure of the magnetic tape.

[0013]

SUMMARY OF THE INVENTION In order to solve the above problems of the tape reel according to the present invention and achieve the above object, a tape for assembling a lower reel and an upper reel and winding a magnetic tape around a cylindrical hub is provided. A reel, wherein the cylindrical hub is provided with a gap inside the outer hub serving as a winding surface of a magnetic tape, and is engaged with a claw of a reel base of a magnetic recording / reproducing apparatus. An inner hub having an engaging portion, a plurality of reinforcing ribs for connecting the hubs are radially provided in a gap between the outer hub and the inner hub, and upper ends of the outer hub and the inner hub are provided. The parts are integrally connected by a disk-shaped connecting part.

The gist of the tape cassette according to the present invention is that the lower reel and the upper reel are assembled and a tape reel for winding a magnetic tape around a cylindrical hub is housed in an internal space. The hub has an outer hub serving as a winding surface of a magnetic tape, and an inner hub which is disposed inside the outer hub with a gap and engages with a claw of a reel base of the magnetic recording / reproducing apparatus. In the gap between the outer hub and the inner hub, a plurality of reinforcing ribs for connecting the two hubs are radially provided, and each upper end of the outer hub and the inner hub is a disc-shaped connecting portion. Are connected together.

According to the tape reel and the tape cassette of the present invention, the outer hub of the cylindrical hub around which the magnetic tape is wound is reinforced at the upper portion by the disc-shaped connecting portion over the entire circumference in the circumferential direction. The middle portion is reinforced with radial ribs, and the lower portion is reinforced with a lower flange, which sufficiently opposes the tightening force in the axial direction of the cylindrical hub due to the winding of the magnetic tape and prevents inward deformation. .
Therefore, in any of the both edges of the magnetic tape, the tape cassette does not lose its wrinkle shape, i.e., one-sided stretching due to environmental changes such as long-term storage of the tape cassette and changes in temperature, thereby preventing the error rate related to the output of recording and reproduction from deteriorating. .

[0016]

Next, a tape reel and a tape cassette according to the present invention will be described with reference to the drawings. Note that, for easy understanding of the invention, portions corresponding to the conventional example are denoted by the same reference numerals as the conventional example.

As shown in FIGS. 1 and 2, the tape reel 1 according to the present invention is made of a synthetic resin molded by injecting a hot-melt synthetic resin into a mold. A lower reel 4 comprising a cylindrical hub 2 having both ends opened, a lower reel flange 3 provided in a disk shape from the lower part of the cylindrical hub 2 perpendicular to the axis, and an upper end of the cylindrical hub 2 And an upper reel 7 having an upper reel flange 6 provided in a disc shape from the coupling portion 5 fitted to the
Consists of

A metal reel plate 8 is mounted between the inner upper end surface of the cylindrical hub 2 and the lower end surface of the connecting portion 5.

The cylindrical hub 2 of the lower reel 4 comprises an inner hub 2a and an outer hub 2b disposed outside the inner hub 2a with a predetermined gap 2c. The inner hub 2a is provided with a claw 10 as an engaging portion that engages when a claw of a reel stand on the VTR side, which is a magnetic recording / reproducing apparatus, is fitted into the internal space 9, and an inner periphery of the inner hub 2a. A plurality of projections are provided at equal intervals in the circumferential direction of the wall surface toward the axis. Further, a step 2e is formed on the inner peripheral surface near the upper end surface of the inner hub 2a.

In the gap 2c between the inner hub 2a and the outer hub 2b, the lower reel 4 is prevented from sinking so as to have a uniform thickness, and serves as a winding surface on which the magnetic tape is wound. In order to prevent deformation of the hub 2b, a plurality of reinforcing ribs 11 are radially provided at predetermined intervals around the axis of the cylindrical hub 2.

The outer hub 2b has an outer peripheral surface 2d serving as a winding surface of the magnetic tape 12, and the magnetic tape 12 is wound thereon. The upper end of the outer hub 2b and the upper end of the inner hub 2a are connected by a disc-shaped connecting portion 13,
The outer hub 2b and the inner hub 2a have an integral structure that is substantially continuous at the upper end.

A welding rib 14 is provided at an appropriate position on the upper surface of the disc-shaped connecting portion 13. Further, a rib 15 that stands upward is provided above the outer hub 2b of the cylindrical hub 2 and substantially flush with the outer peripheral surface 2d. The ribs 15 are used to prevent the margin from melting out on the outer peripheral surface 2d of the outer hub 2b when ultrasonic welding is performed at the position of the welding rib 14.

With respect to the lower reel 4 thus formed,
When the upper reel 7 is connected, the reel plate 8 is placed on the step 2 e of the inner hub 2 a of the lower reel 4, and is fitted so as to cover the connecting portion 5. The upper reel 7 and the lower reel 4 are integrated by, for example, ultrasonic welding means at the position of the welding rib 14 to form the tape reel 1.

The tape reel 1 of the present invention having the above configuration
, The outer hub 2b around which the magnetic tape 12 is wound
The upper portion is reinforced over the entire circumference in the circumferential direction by the disc-shaped connecting portion 13, the intermediate portion is reinforced by the reinforcing rib 11, the lower portion is reinforced by the lower reel flange 3, and the upper reel 7 is further reinforced. Is the outer hub 2b of the lower reel 4.
, The upper end of the outer hub 2b is reinforced by welding, so that even if the tightening force or the winding pressure due to the winding of the magnetic tape 12 is increased, the outer hub 2b is reinforced so as to be able to sufficiently oppose it. It has been configured.

The fitting state between the inner hub 2a of the cylindrical hub 2 of the lower reel 4 and the connecting portion 5 of the upper reel 7 is as follows.
As shown in FIG. 1, the inner peripheral wall surface of the inner hub 2a and the outer peripheral wall surface of the connecting portion 5 are fitted to each other.
The outer hub 2b and the inner hub 2a are transmitted to the reinforcing rib 11 and the inner hub 2a, and the outer hub 2b and the inner hub 2a fall down to the inside of the cylindrical body by the outer peripheral wall surface of the cylindrical coupling portion 5 to be structurally supported. It can be reinforced.

Further, the magnetic tape 1 is attached to the tape reel 1.
The tape cassette which is wound into a pair and wound into a pair is housed in a cassette internal space consisting of an upper half and a lower half, and is loaded into a VTR or the like.

The tape cassette according to the present invention is
When the tape cassette is used in such a manner, the outer hub 2b of the tape reel 1 is deformed against the winding pressure of the magnetic tape 12, even if the tape cassette has been stored in an unused state for a long time. However, since the magnetic tape 12 is not stretched in a so-called one-sided manner, the error rate in the magnetic recording / reproducing output is not deteriorated, and a good recording / reproducing output is maintained, and a high-quality image can be obtained. .

[0028]

As described above, the tape reel according to the present invention is constructed by assembling a lower reel and an upper reel each having a disc-shaped flange and winding a magnetic tape around a cylindrical hub of the lower reel. The cylindrical hub has an outer hub serving as a winding surface of a magnetic tape, and an engaging portion which is disposed inside the outer hub with a gap and which engages with a claw of a reel base of the magnetic recording / reproducing apparatus. In the gap between the outer hub and the inner hub, reinforcing ribs for connecting the two hubs are radially provided, and the upper ends of the outer hub and the inner hub are disc-shaped connecting portions. Because it is integrally connected, even if the winding pressure is increased due to winding of a long magnetic tape or the winding pressure is further increased due to a long storage state or a change in environment, the outer hub is firmly supported up and down. So that it does not tilt or deform, Not the seaweed shape gone elongation phenomenon, in which an excellent effect of being maintained in a good condition.

Further, the upper reel is fixed to the lower reel by welding means at the welding rib protruding from the upper surface of the disc-shaped connecting portion, so that the upper reel allows the upper end of the outer hub of the lower reel to be fixed. The portion is further reinforced, and has an excellent effect of preventing deformation of the outer hub.

Further, a rib that rises toward the upper reel is protruded from the outer peripheral portion on the upper surface of the cylindrical hub, so that even when ultrasonic welding is performed at the position of the welding rib, the outer peripheral surface of the outer hub is also provided. This has an excellent effect that it is possible to prevent the dissolution of the margin.

In the tape cassette according to the present invention, the tape reel according to the present invention is housed in the internal space.
Even if the magnetic tape is stored for a long period of time, the tape does not elongate and does not enter a wakame state, so that an excellent effect of obtaining a high image quality without reducing the error rate in recording / reproducing output can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a half of a tape reel according to the present invention.

FIG. 2 is a plan view of a lower reel constituting the tape reel according to the present invention.

FIG. 3 is an exploded sectional view showing components of a tape reel according to a conventional example.

FIG. 4 is a plan view of a lower reel constituting the tape reel of the conventional example.

FIG. 5 is an enlarged sectional view showing a main part of a lower reel of the conventional example.

FIG. 6 is an explanatory diagram showing a half-extended state of the magnetic tape wound on the tape reel of the same conventional example, which is caused by deformation of the outer hub.

[Explanation of symbols]

1 tape reel, 2 cylindrical hub, 2a inner hub, 2
b outer hub, 2c gap, 2d outer peripheral surface, 2e step, 3 lower reel flange, 4 lower reel, 5 coupling part, 6 upper reel flange, 7 upper reel, 8 reel plate, 9 internal space of inner hub, 10 nails , 11 reinforcing ribs, 12 magnetic tape, 13 disc-shaped connecting part, 1
4 welding ribs, 15 ribs.

Claims (4)

[Claims] 1. A tape reel for assembling a lower reel and an upper reel each having a disk-shaped flange and winding a magnetic tape around a cylindrical hub of the lower reel, wherein the cylindrical hub is configured to wind a magnetic tape. An outer hub serving as a mounting surface, and an inner hub which is disposed with a gap inside the outer hub and has an engaging portion which engages with a claw of a reel stand of the magnetic recording / reproducing apparatus. A plurality of reinforcing ribs connecting the hubs are provided radially in a gap between the inner hub and the upper ends of the outer hub and the inner hub are integrally connected by a disc-shaped connecting portion. A tape reel characterized by: 2. The tape reel according to claim 1, wherein the upper reel is fixed to the lower reel by a welding rib protruding from an upper surface of the disc-shaped connecting portion. 3. The tape reel according to claim 1, wherein a rib rising toward the upper reel protrudes from an outer peripheral portion on an upper surface of the cylindrical hub. 4. A tape reel for assembling a lower reel and an upper reel, each having a disc-shaped flange, and winding a magnetic tape around a central cylindrical hub of the lower reel, and assembling a lower half and an upper half. A tape cassette to be housed in an internal space made up of: a cylindrical hub of the tape reel; an outer hub serving as a winding surface of a magnetic tape; An inner hub having a rib that meshes with a claw of a reel stand of the reproducing apparatus; a plurality of reinforcing ribs connecting the hubs are radially provided in a gap between the outer hub and the inner hub; The upper end portions of the tape cassette and the inner hub are integrally connected by a disc-shaped connecting portion.