JPH06195620A - Magnetic head for magnetic tape - Google Patents

Abstract

PURPOSE:To enhance a cross feed characteristic and to stabilize an erasing characteristic with the magnetic head device for a magnetic tape to be used for a magnetic recorder utilizing the magnetic tape. CONSTITUTION:This magnetic head device has a magnetic head 18 for erasing having a shielding cover 20 formed with a tape sliding guide 19 on which the magnetic tape slides in the position placed in the same plane with the tape sliding surfaces 9 of head cores 18a, 18b for erasing at the prescribed winding angle. As a result, the head cores 18a, 18b for erasing are completely shielded up to the tape sliding surfaces 9 and the direct influence of the deflection of the magnetic tape during traveling on an erasing gap part 2 is averted. The high cross feed characteristic and the stable erasing characteristic are thus obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device for a magnetic tape used in a magnetic recording device using a magnetic tape.

[0002]

2. Description of the Related Art In recent years, a magnetic head device uses a magnetic metal material such as permalloy or a non-metal magnetic material such as ferrite as a magnetic material, and has various recording, reproducing and erasing functions. Is generally used for recording information on a magnetic tape, which is a magnetic recording medium, and reading prerecorded information for reproduction.

On the other hand, the erasing magnetic head is a magnetic recording medium prerecorded with a width dimension equivalent to the width dimension of a magnetic tape which is a magnetic recording medium or a width dimension approximately equal to the track width on which each information is recorded. Erase the information above.

In order to improve the recording / reproducing characteristics, various measures have been taken to stabilize the running performance of the magnetic tape and to accurately regulate the sliding characteristics of the magnetic tape (for example, actual Kaihei 1-5).
209, JP-A-4-111209).

A conventional magnetic head device for a magnetic tape will be described below. As shown in FIGS. 4 to 6, an erasing magnetic head having an erasing gap portion 2 formed by sandwiching a non-magnetic material between erasing head cores 1a and 1b and having a predetermined track width. By 1, the data on the magnetic tape is erased. The track width of the erasing head cores 1a and 1b is set to be equal to or larger than the width dimension of the magnetic tape in order to erase the data on the magnetic tape at one time. Also, on both sides of the erasing head cores 1a and 1b, when the magnetic head device moves while recording data on the magnetic tape (hereinafter referred to as streaming), the magnetic tape falls off the erasing head cores 1a and 1b, and For the purpose of preventing damage to the tape and blocking the leakage flux to both sides generated from the erasing gap 2 to reduce the influence on the recording / playback head, glass, ceramics, etc. A side block 4 made of an oxide magnetic material such as ferrite is adhered with an epoxy resin or the like through the non-magnetic body 3.

Further, the erasing head cores 1a and 1b are
A coil winding 6 is provided on a bobbin 5 mounted on the opposite side of the erase gap portion 2 for insulation protection, and by connecting the coil winding 6 to a relay terminal plate 7, a cable wire or the like is used for relaying. An electric signal from the outside is transmitted through the terminal board 7.

A tape sliding surface 9 is formed on a part of the slider portion 8 of the recording / reproducing magnetic head made of ferrite.
In addition, a recording head core 10 and a reproducing head core 11
Are arranged with a recording gap 12 and a reproducing gap 13 respectively corresponding thereto. The slider portion 8 is fixed by the holder 14 made of aluminum alloy, and at the same time, the erasing head cores 1a and 1b also have a predetermined winding angle between the slider portion 8 and the magnetic tape via the erasing head base plate 15. Further, the magnetic tape is attached so as to maintain a predetermined positional relationship with the recording head core 10 and the reproducing head core 11 also in the width direction of the magnetic tape.

The erasing head base plate 15 and the erasing magnetic head 1 are made of a non-magnetic material 16 such as glass or ceramics.
Are joined through.

A shield cover 17 made of a magnetic material such as permalloy or ferrite is fitted under the side block 4 and is generated from a portion other than the erasing gap portion 2 of the erasing magnetic head 1 together with the erasing head base plate 15. Recording / reproducing head core 1 by blocking the leakage flux
The effects on 0 and 11 are excluded.

[0010]

However, in the above-mentioned conventional configuration, the side blocks 4 made of an oxide magnetic material are provided on both sides of the erasing head cores 1a and 1b with the non-magnetic material 3 interposed therebetween, such as epoxy resin. Since it is used and arranged, the workability is poor and the productivity is remarkably reduced, and the parts for cutting off the leakage flux generated from the erase gap portion 2 and other than the erase gap portion 2 are divided into four (shield). In addition to the cover 17, the head base plate 15, and the two side blocks 4), the erase gap portion 2 is not covered with a cover for blocking the leakage flux, so that the erase gap portion 2 is not covered by the cover. There is a problem that the erase cross feed characteristic, which represents the ratio of the leakage magnetic flux from the magnetic head 1 side to the reproducing head core 11, is deteriorated. Since no sliding surface of the magnetic tape as a gas head device, vibration of the magnetic tape (fluttering)
However, there is a problem that the erasing characteristic becomes unstable because a gap loss occurs because it directly affects the erasing gap portion 2.

The present invention solves the above-mentioned conventional problems, and provides a magnetic head device for a magnetic tape, which is equipped with an erasing magnetic head having high productivity, high cross-feed characteristics and stable erasing characteristics. The purpose is to

[0012]

To achieve this object, a magnetic head device for a magnetic tape according to the present invention has a magnetic tape at a position which is flush with a tape sliding surface of an erasing head core at a predetermined winding angle. The magnetic head for erasing is provided with a shield cover formed with a tape sliding guide for sliding.

[0013]

In this structure, the erasing head core is completely shielded up to the tape sliding surface, and the runout of the magnetic tape does not directly affect the erasing gap portion.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In one embodiment of the present invention, the same components as those described in the above-mentioned conventional example are designated by the same reference numerals and the description thereof will be omitted.

The feature of this embodiment is that, as shown in FIGS. 1 to 3, the erasing head cores 18a and 18b are different from the conventional erasing head cores 1a and 1b in the conventional structure. Erased magnetic head 18,
The side block 4 of the conventional example is not provided, and a shield cover 20 in which a tape sliding guide 19 is formed instead of the shield cover 17 is provided. That is, although the conventional erasing head cores 1a and 1b have a straight shape, the erasing head cores 18a and 18a of the present embodiment have a straight shape.
The track width of 18b is preliminarily processed to have a sufficient width so that the magnetic tape does not fall off during streaming of the magnetic head device so that the coil winding portion having the coil winding 6 on the bobbin 5 does not protrude from the track width. It has a T-shape. As a result, the side block 4 of the conventional example becomes unnecessary, and the manufacturing cost can be reduced by reducing the number of parts and the number of assembling steps. In addition, the shield cover 20 for blocking the leakage magnetic flux generated from the erasing gap portion 2 and the erasing head cores 18a and 18b is provided with the erasing head core 18.
The erasing gap portion 2 and the erasing head core are arranged by arranging the tape sliding surfaces 9 of a and 18b on the same plane at a predetermined tape winding angle and adhering them with a mold resin 21 such as an epoxy resin. The leakage magnetic flux generated from 18a and 18b and affecting the reproducing head core 11 can be suppressed in a substantially perfect state, and the cross feed characteristic can be remarkably improved.

Further, a tape sliding guide 19 is formed on the shield cover 20 for the purpose of suppressing the shake of the magnetic tape during running from directly affecting the erasing gap portion 2. Since the contact state with the gap portion 2 is stabilized, stable and good erasing characteristics can be obtained.

[0018]

As is apparent from the above description, the present invention is a tape sliding guide in which a magnetic tape slides on the same surface as the tape sliding surface of the erasing head core at a predetermined tape winding angle. With the configuration provided with the erasing magnetic head having the shield cover formed in the above, it is possible to realize an excellent magnetic tape magnetic head device having high productivity, high cross-feed characteristics, and stable erasing characteristics.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a magnetic head device for a magnetic tape according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a schematic side view of an erasing magnetic head of a magnetic tape magnetic head device.

FIG. 4 is a perspective view of a main part of a conventional magnetic head device for magnetic tape.

FIG. 5 is an exploded perspective view of the same.

FIG. 6 is a schematic side view of an erasing magnetic head of the same magnetic tape magnetic head device.

[Explanation of symbols]

 2 Erasing gap portion 9 Tape sliding surface 10 Recording head core 11 Reproducing head core 18 Erasing magnetic heads 18a, 18b Erasing head core 19 Tape sliding guide 20 Shield cover

Claims (1)

[Claims] 1. A magnetic head device for a magnetic tape having a recording head core, a reproducing head core and an erasing head core, the magnetic head device being at the same position as the tape sliding surface of the erasing head core at a predetermined winding angle. A magnetic head device for a magnetic tape, comprising a erasing magnetic head provided with a shield cover formed with a tape sliding guide on which a magnetic tape slides.