JPH0124737Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a wrapping tape for a magnetic recording/reproducing device for removing dirt adhering to the video head of the magnetic recording/reproducing device.

[Description of prior art]

In general, since a magnetic recording tape is slid onto the surface of a video head in a magnetic recording/reproducing device at high speed, a broken layer is formed by minute abrasions on the surface of the magnetic recording tape. In a high frequency range (4 MHz to 5 MHz) such as a video signal, the fracture layer formed on the surface of the video head acts as a nonmagnetic layer and significantly reduces the recording and reproducing efficiency of the video head.

Therefore, the dirt on the surface of the video head is removed by wiping the gap area of the video head with a cotton swab or the like impregnated with a cleaning liquid or the like. Furthermore, to remove stubborn dirt that cannot be removed by wiping, a wrapping tape (cleaning tape) for magnetic recording and playback devices can be slid onto the surface of the video head to polish away dirt near the gap of the video head. and removed. This wrapping tape for magnetic recording and playback devices has an abrasive material coated over the entire width of the tape surface, which is the width of the magnetic recording tape.It reliably removes the broken layer that has already adhered to the video head. Recording and playback efficiency can be improved. However, since the surface of the video head is easily damaged and has a different stiffness from that of the magnetic recording tape, the tape touch of the magnetic recording tape to the video head after polishing deteriorates. The drawback was that pacing loss was likely to occur and high-quality images could not be obtained.

By the way, the surface of the video head wears out over a long period of use due to the abrasive action of the magnetic recording tape. This wear is affected by the tape running mechanism and is caused by the first gap position of the video head.
As shown in the figure and FIG. 2, it tends to be biased. Figure 1 shows a state in which the video head 1 is more worn 3' at the rear of the gap 2 in the rotation direction, and Figure 2 shows a state in which the video head 1 is worn more at the front of the gap 2 in the rotation direction. . Due to the wear 3 of the video head 1 as shown in FIG. 1, the output level of the reproduction output of the video head 1 drops at the beginning of cutting the magnetic recording tape, as shown in FIG. 3, and the S/N ratio at the upper end of the screen deteriorates. Furthermore, due to wear 3' of the video head 1 as shown in Fig. 2, the output level of the playback output of the video head 1 drops at the end of cutting the magnetic recording tape as shown in Fig. 4, and the S/N at the bottom edge of the screen deteriorates. do. Such uneven wear of the video head 1 cannot be improved in any way by the above-mentioned conventional wrapping tape for magnetic recording and reproducing devices.

[Summary of the idea]

The present invention was developed to further improve the above-mentioned wrapping tape for magnetic recording and playback devices.It can be attached to magnetic recording and playback devices, and the wrapping tape can be wrapped around a tape with a width narrower than the tape width. A magnetic recording and reproducing device that is equipped with a band that causes only minor damage to the video head surface, corrects uneven wear of the video head, and holds the video head in a manner that allows high-quality images to be obtained. The purpose is to provide wrapping tape for

[Explanation of Examples]

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 5 to 10. 5 and 6 are perspective views of main parts showing different embodiments of the wrapping tape for the magnetic recording and reproducing apparatus of the present invention, and FIGS. 9 and 10 are a plan view and a front view for explaining the sliding relationship of tapes, respectively, and FIGS. 9 and 10 are respectively the wrapping tapes for the magnetic recording and reproducing apparatus of the present invention shown in FIGS. It is a figure for explaining the effect of the Example.

In the one shown in FIG. 5, an abrasive band 5 coated with an abrasive of about #10,000 is provided on the upper half of the starting or ending end of the magnetic recording tape 4. This abrasive band 5 is narrower than the tape width of the magnetic recording tape 4 and is formed by pasting a tape coated with an abrasive material on the magnetic recording tape 4 in advance. The magnetic recording tape 4 is housed in a cassette housing (not shown), and is configured to be able to be attached to a magnetic recording/reproducing device.

In the example shown in FIG. 6, an abrasive band 5' is provided at the lower half of the starting or ending end of the magnetic recording tape 4.

Here, the sliding relationship of the magnetic recording tape to the rotating head will be explained. As shown in FIG. 6, the magnetic recording tape 4 is guided by the guide posts 7, 7 and wound around the rotating rotary head 6, and is driven by the capstan 8 and travels. Due to the frictional force between the rotating head 6 and the magnetic recording tape 4, the sliding pressure of the magnetic recording tape 4 against the rotating head 6 is large at the front in the rotational direction of the rotating drum 6 at part A at the beginning of winding, and at B at the end of winding. It becomes larger at the rear in the rotational direction of the rotating drum 6. As shown in FIG. 8, the video head 1 slides on the lower side of the magnetic recording tape 4 at section A at the beginning of winding, and the video head 1 slides on the upper side of the magnetic recording tape 4 at section B at the end of winding. are doing.

Therefore, when a wrapping tape for a magnetic recording/reproducing device having an abrasive band 5 provided on the upper half of the magnetic recording tape 4 shown in FIG. It undergoes abrasion, with more abrasion occurring at the rear in the direction of rotation.
Furthermore, when a wrapping tape for a magnetic recording/reproducing device having an abrasive band 5' provided on the lower half of the magnetic recording tape 4 shown in FIG. More polishing occurs at the front in the direction of rotation.

Therefore, as shown in FIG. 1, the video head 1 is more worn 3 at the rear in the direction of rotation of the gap 2, whereas the lower half of the video head 1 shown in FIG.
If you polish it with a wrapping tape for a magnetic recording/playback device equipped with a gap 2, as shown in Figure 9,
The amount of wear can be made uniform around .
Furthermore, as shown in FIG. 2, if the video head 1 is more worn 3' in the front of the gear 2 in the rotational direction, an abrasive band 5' is added to the upper half of the video head 1 as shown in FIG.
Polishing can be done using a wrapping tape for magnetic recording and reproducing devices equipped with a tape.

Therefore, according to the wrapping tape for a magnetic recording and reproducing device of the present invention having the above-described configuration,
Dirt on the video head 1 is removed, and in particular, the amount of wear on the video head 1 can be made uniform around the gap 2.

It should be noted that it can be appropriately determined from the reproduced image whether the wrapping tape for the magnetic recording/reproducing apparatus should be used, with the abrasive bands 5, 5' in the upper half or the lower half.

In the above embodiment, the abrasive bands 5, 5' are attached to the magnetic recording tape 4, but as shown in FIG. The tape 10 may be spliced to the beginning or end of the magnetic recording tape 4 by splicing 11. Furthermore, a tape having the same width as the magnetic recording tape 4 may be wound around the cassette housing, and the abrasive bands 5, 5' may be provided on the upper or lower half of the tape. Furthermore, an abrasive band 5 is placed on the upper half of the tape up to half the length from the beginning of the tape.
, and an abrasive band 5' may be provided on the lower half of the remaining tape. When this single tape is provided with an upper half polishing band 5 and a lower half polishing band 5', the polishing of the video head 1 can be appropriately selected depending on the position where the tape is used.

[Effect of idea]

As explained above, according to the wrapping tape for a magnetic recording and reproducing device having the above structure, since the width of the abrasive band is narrow, it is possible to abrade more appropriate parts of the video head, and This not only removes dirt from the surface of the head, but also makes the amount of wear on the video head uniform around the gap, making it possible to maintain high-quality reproduced images.

[Brief explanation of the drawing]

Figure 1 shows a state in which the video head is more worn at the rear in the direction of rotation of the gap, Figure 2 shows a state in which the video head is worn more at the front in the direction of rotation of the gap, and Figure 3 shows a state in which the video head is worn more at the front in the direction of rotation of the gap. 4 shows the playback output of the video head in the worn state of FIG. 1, FIG. 4 shows the playback output of the video head in the worn state of FIG. 2, and FIGS. FIGS. 7 and 8 are perspective views showing different embodiments of the wrapping tape for the magnetic recording and reproducing device of the invention; FIGS.
The figures are a plan view and a front view for explaining the sliding relationship of the magnetic recording tape to the rotary head, and FIGS. 9 and 10 are for the magnetic recording and reproducing apparatus of the present invention shown in FIGS. 5 and 6. Figure 1 for explaining the function and effect of each embodiment of the wrapping tape.
FIG. 1 is a diagram showing still another embodiment of the wrapping tape for a magnetic recording/reproducing apparatus of the present invention. In the figure, 1...video head, 2...gap, 3...wear, 4...magnetic recording tape, 5...
5', 9...Abrasive band, 6...Rotating head, 7...
Guide post, 8...capstan, 10...leader tape, 11...springing.

Claims (1)

[Claims for Utility Model Registration] (1) A magnetic recording and reproducing device that can be freely attached to a magnetic recording and reproducing device, and characterized in that a tape having the width of a magnetic recording tape is provided with an abrasive band whose width is narrower than the tape width. Wrapping tape for. (2) The wrapping tape for a magnetic recording and reproducing device according to claim 1, wherein the abrasive band is provided on the upper half or the lower half of the tape. (3) The magnetic recording tape according to claim 1 or 2 of the utility model registration claim, characterized in that the abrasive band is provided at either the starting end, the ending end, or both ends of the magnetic recording tape. Wrapping tape for playback equipment.