JPH04353682A - Tape reel - Google Patents

Abstract

PURPOSE:To suppress the generation of a dropout and a drop in C/N by preventing transfer onto a magnetic tape by a step caused between a clamp and the outer circumferential surface of a reel hub concerning a tape reel which is used by winding it with a metal powder coated type magnetic tape or a metal thin film deposited type magnetic tape. CONSTITUTION:An adhesive layer 8 is arranged on the circumferential surface of a reel hub 2 using no clamp to hold a leader tape and a trailer tape 4 which are engaged with the initial and final ends of a magnetic tape 5.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape reel used for winding a magnetic recording medium.

0002

2. Description of the Related Art In VHS video cassettes and 8 mm video cassettes that have been widely used in the past, a tape reel has a magnetic tape 5 placed in a recess 3 provided on a part of the outer periphery of a reel hub 2, as shown in FIG. The ends of the leader tape and trailer tape 4 that are engaged with each other are inserted, the clamp 6 is fitted into the recess 3 to fix the leader tape and the trailer tape 4, and the magnetic tape 5 is wound around the outer circumferential surface of the reel hub 2. used.

0003

[Problem to be Solved by the Invention] However, with the progress of magnetic recording in recent years, the magnetic recording layer has become smoother and the overall thickness of the magnetic tape has become thinner. Clamp 6 and reel hub 2
Because there is a difference in level between the outer circumferential surface of the reel hub 2 and the outer peripheral surface of the reel hub 2, the step shape 7 may be transferred to the magnetic tape 5 wound around the reel hub 2 or the magnetic tape 5 may be formed into multiple layers due to long-term storage or storage in a high-temperature environment. Due to the tightness of the magnetic tape 5 when it is wound,
Since the surface shape of the back coat layer is transferred to the magnetic recording layer of the magnetic tape 5, there are problems such as dropouts and deterioration of C/N characteristics when used inside a cassette case. Was.

[0004] In view of the above problems, the present invention does not use a clamp, but by disposing an adhesive layer on the outer circumferential surface of the reel hub, the leader tape and the trailer tape are held on the reel hub, and there is no space between the clamp and the outer circumferential surface of the reel hub. The present invention provides a tape reel that suppresses the generation of steps and the transfer of the surface shape of the magnetic tape back coat layer to the magnetic recording layer of the magnetic tape.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the tape reel of the present invention has a structure in which a leader tape and a trailer tape are held on the tape reel by disposing an adhesive layer on the outer peripheral surface of the reel hub. It is something.

[0006]

[Operation] With the above-described structure, the present invention holds the leader tape and trailer tape without using a clamp, so there is no difference in level between the clamp and the outer peripheral surface of the reel hub, and the step shape is transferred to the magnetic tape. The elastic force of the adhesive layer placed on the reel hub prevents the surface shape of the back coat layer of the magnetic tape from being transferred to the magnetic recording layer, preventing dropouts and C.
/N characteristics can be suppressed from deteriorating.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A tape reel according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a tape reel according to an embodiment of the present invention. 1, the difference from the conventional example shown in FIG. 4 is that an adhesive layer 8 is disposed on the outer peripheral surface of the reel hub to hold the leader tape and trailer tape 4 without using a clamp. The adhesive layer 8 may have a one-layer structure as shown in FIG. 3, and may be applied directly to the reel hub 2, or may have an adhesive layer formed on both sides of a polymer film such as polyethylene terephthalate or polypropylene as shown in FIG. You may also apply so-called double-sided tape. Materials for the adhesive layer 8 include acrylic resin, epoxy resin, urethane resin, butyl rubber, and the like. The thickness of the adhesive layer is preferably 5 μm or more, more preferably 10 μm or more, in order to sufficiently absorb the surface shape of the back coat layer.

An embodiment of the present invention will be explained in more detail below. An adhesive made of acrylic resin is applied to the outer peripheral surface of the reel hub 2 to various thicknesses, a leader tape and a trailer tape 4 are adhered, and a cobalt adhesive is applied to the outer circumferential surface of the reel hub 2.
A thin metal film-deposited magnetic tape 5 made of a nickel alloy was wound and rotatably housed in the main body case, and an environmental preservation test was conducted.

[0010] The tape reel conditions and environmental preservation test results for each example and comparative example are summarized (Table 1).

[0011]

[Table 1]

[0012] Environmental preservation test was carried out at a temperature and humidity of 40°C and 80%.
The dropout and C/N characteristics of a magnetic tape that had been left and stored for one month under these conditions were measured. Dropout is a video tape cassette that is loaded into a video deck, a video signal is recorded, and the output when played back is 15.
A time when the power decreased by 16 dB or more in a time of 1 μsec or more was counted as one, and the number of occurrences per minute was measured. The C/N characteristic is the C/N when the obtained video tape cassette is loaded into a video deck and a video signal is recorded and played back.
was measured and compared with the C/N before being left under conditions of temperature and humidity of 40° C. and 80%. Surface observation was performed using an optical microscope (magnification: 1
The presence or absence of transfer of the surface shape of the back coat layer on the surface of the magnetic recording layer of the magnetic tape 5 was examined.

As can be seen from Table 1, by using the tape reel of the present invention, the stepped shape of the clamp unlike the conventional example is eliminated, and the transfer of the surface shape of the back coat layer of the magnetic tape 5 is suppressed. It is possible to suppress an increase in dropout and a decrease in C/N characteristics, and it is possible to obtain a higher level of storage reliability. Example 1~
As shown in Figure 3, when the thickness of the adhesive layer is 10 μm or less, although it is more effective than the comparative example, it cannot sufficiently absorb the surface shape of the back coat layer, resulting in an increase in dropouts and poor C/N characteristics. It can be seen that it is not possible to sufficiently suppress the decrease in .

In the above example, a metal thin film deposited magnetic tape was used, but it has been confirmed that a metal powder coated magnetic tape has the same effect.

[0015]

[Effects of the Invention] As described above, the tape reel of the present invention has
In both cases, compared to conventional tape reels, shape transfer to the magnetic tape wound around the outer peripheral surface of the reel hub is suppressed, and superior effects such as dropouts and deterioration of C/N characteristics can be obtained.

[Brief explanation of drawings]

FIG. 1: Exploded perspective view of one embodiment of the present invention

FIG. 2 is a cross-sectional view of an adhesive layer according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of an adhesive layer according to an embodiment of the present invention.

[Figure 4] Exploded perspective view of a conventional tape reel

[Figure 5] Exploded perspective view of a conventional tape reel

[Explanation of symbols]

1 Reel flange 2 Reel hub 4 Leader tape and trailer tape 8 Adhesive layer 9 Polymer film

Claims (1)

[Claims] 1. A tape reel that is used by winding a magnetic tape around the outer peripheral surface of a reel hub and storing it in a cassette case, the leader tape having an adhesive layer arranged on the outer peripheral surface of the reel hub and engaging with the magnetic tape; Tape reel characterized by holding trailer tape