JPH056642A - Tape reel - Google Patents

Abstract

PURPOSE:To provide an excellent tape reel without deterioration of the quality of an image even after the reel is left alone for a long time by solving the shape transfer of a clamper to a tape with regard to the tape reel used in a recording and regenerating apparatus such as video tape recorder. CONSTITUTION:A tape 7 whose main material is polyethylene terephthalate is hooked in an recess part 5 of a hub l that is a Duracon molded product and temporarily fixed. Then, a metallic die 10 which has the shape along the hub 1 and the excellent surface property is made to push on the outer surface of the hub 1 with the tape 7 in-between. Thereafter, the material of a clamper 4 in a fused state is injected through an injecting port 9 provided in a flange 2. When the clamper 4 is sufficiently solidified, the die 10 is separated from the hub l, and the end part of the tape 7 is fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape reel most suitable for use in a recording / reproducing apparatus such as a video tape recorder.

[0002]

2. Description of the Related Art In recent years, the magnetic recording / reproducing technology has made remarkable progress, and devices such as video tape recorders have been under development for miniaturization and high image quality. Along with this, with regard to tapes, which are the medium, thin-layer recording and high-density recording of magnetic materials are being used for high-density recording. For example, the VHS format tape is coated with cobalt iron oxide having a tape thickness of about 19 μm, while the Hi-8 tape is formed by applying metal or vapor-depositing with a tape thickness of about 10 μm. These tapes are generally wound around a tape reel and stored in a tape cassette.

A conventional tape reel will be described below with reference to FIG. As shown, the hub 2 of the tape reel 23 formed by the hub 21 and the flange 22.
A fitting portion 26 into which a resin-molded clamper 25 that locks the end portion of the tape 24 is fitted is provided to the No. 1 and the end portion of the tape 14 is fixed to the fitting portion 26 by the clamper 25.

[0004]

In such a conventional tape reel, since the hub 21 and the clamper 25 are parts formed by resin molding, it is necessary to allow some variation in accuracy, and the tape 24 of the tape 24 when fitted is fitted. In many cases, a step is generated on the winding surface or a recess is formed by chamfering the corner portion of the fitting portion 26. When the tape 24 is wound and left for a long time, this shape is transferred to the inner peripheral portion of the tape 24. ,
When the shape transfer part passes the head during recording / reproduction by a video tape recorder, recording or reproduction failure occurs due to spacing loss, which causes synchronization failure on the TV screen, S / N reduction, and dropout increase. Problem has occurred. This problem was not a serious problem because the shape transfer was small when the tape thickness was large, and the spacing loss was small when the recording wavelength was long, but the tape thickness was as thin as about 10 μm like Hi-8. However, the recording wavelength becomes a short wavelength of about 0.5 μm, which is a big problem, and the deterioration of image quality after long-term storage in a high temperature environment is remarkable.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a tape reel having a good image quality even after being left for a long time.

[0006]

In order to achieve this object, the tape reel of the present invention is formed by inserting a tape into a concave portion for fixing the end portion of the tape and then molding the clamper.

[0007]

According to the present invention, since the clamper is molded last according to the outer circumference of the hub, there are few steps or dents on the tape winding surface. Therefore, shape transfer is suppressed even after standing for a long time, and the image quality is improved.

[0008]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIG.

As shown in the drawing, a tape reel 3 is formed by a hub 1 and a flange 2 which are molded by Duracon, and a recess 5 for molding a clamper 4 on a part of the outer circumference of the hub 1.
The recess 5 is provided with a recess 6 for preventing the clamper 4 from coming off, and a temporary fixing projection 8 for temporarily fixing by hooking a tape 7 whose main material is polyethylene terephthalate. An injection port 9 that communicates is formed.

Reference numeral 10 denotes a mold having a good surface property for molding the clamper 4 having a shape along the outer surface of the hub 1 and adapted to cover the recess 5.

In the above structure, the clamping operation will be described. The end portion of the tape 7 is guided into the concave portion 5 and the protruding portion 8 is introduced.
Temporarily fix by using the die 10 of the shape along the hub 1.
Is pressed against the outer surface of the hub 1 with the tape 7 interposed therebetween. The material of the clamper 4 in a molten state (the temperature at the time of injection is 120 ° C.
Of acrylic hot melt) is injected from an injection port 9 provided in the flange 2, and when the clamper 4 is sufficiently solidified, the mold 10 is separated from the hub 1, and the clamper 4 molded in the recess 5 formed in the hub 1 The end portion of the tape 7 is fixed to the hub 1.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to FIG.

The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in the figure, the hub 11 is made of a quick-drying epoxy putty and is a semi-solid cylindrical clamper 1.
2 is provided in the flange 15, and a square hole 14 communicating with the concave portion 13 is provided in the flange 15.
The presser lever 16 to be inserted into is vertically movable.

In the above structure, the clamp will be described. First, the pressing lever 16 is inserted from the outside of the flange 15 into the square hole 14, and the taper 7 whose main material is polyethylene terephthalate is used as the material of the clamper 12 without a gap. Wrap around more than one turn to make a Duracon molded hub recess 1 in hub 1.
3, the die 10 having a shape good along the peripheral surface of the hub 11 and having a good surface property is pressed against the outer periphery of the hub 11 with the tape 7 interposed therebetween, and the pressing lever 16 is moved in the arrow A direction.
Crush the material of the clamper 12. Then, when the clamper 12 is sufficiently solidified, the mold 10 is separated from the hub 11, and the pressing lever 16 is attached to the square hole 14 of the flange 15.
Clamper 1 with the end of tape 7 wound around
The end portion of the tape 7 in which 2 is fixed to the concave portion of the hub 11 is held.

The tape reel of this embodiment is provided with a ME for Hi-8.
After wrapping the tape (made by Sony) for 20 minutes with a tension of 20 g, store it in the cassette half for Hi-8, and
After leaving it in the environment of 3 ℃ 70%, 60 ℃ DRY for 1 week,
Hi-8VTR (SONY
Recording / reproduction was performed in the manufactured EV-S900 SP mode), the number of times of dropout, S / N, and synchronization failure were measured, and the results were compared with the conventional example and the unleaved product (Table 1).

[0017]

[Table 1]

The dropout was measured using a Shibasoku dropout counter, and the S / N was measured using a Shibasoku noise meter.

As is clear from this (Table 1), in both the tape reel of the present embodiment and the tape reel of the second embodiment, dropout and S / N deterioration are scarce even after being left for a long time in a high temperature environment. It can be seen that there is no synchronization failure.

As described above, according to the present embodiment, after the tape 3 is inserted into the hub 1, the clamper 2 is molded according to the mold having the shape along the outer periphery of the hub. Therefore, the step difference between the hub 1 and the clamper 2 is formed. Also, there is almost no dent, and even after the tape is wound and left for a long time, the shape transfer is small, so that good image quality can be maintained.

Although the embodiment has a flange, a tape reel without a flange is also possible. For example, the mold may have a shape that encloses the hub.
Further, although resin is used as the material of the clamper in the second embodiment, it goes without saying that a material other than resin, for example, a relatively soft metal such as lead may be used.

[0022]

As is apparent from the above embodiments, the present invention is an excellent tape reel in which the image quality is less deteriorated even after being left for a long time by molding the clamper after inserting the end portion of the tape into the clamper portion. Can be provided.

[Brief description of drawings]

FIG. 1 is a plan view showing a clamper section which is a partial cross section of a tape reel according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a clamper part which is a partial cross section of a tape reel according to a second embodiment of the present invention.

FIG. 3A is a plan view of a conventional tape reel, and FIG. 3B is a detailed sectional view of a conventional tape reel.

[Explanation of symbols]

 1,11 Hub 4,12 Clamper 5,13 Recess 7 Tape

Claims (1)

Claim: What is claimed is: 1. A tape reel comprising: inserting a tape end into a recess for fixing the tape end; and molding a clamper in the recess.