JPS6242331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head such as a magnetic disk device that records and reproduces information while facing a medium, and particularly aims to eliminate static electricity noise caused by sliding between the medium and the magnetic head. It is.

FIG. 1 is a perspective view of the slider portion of the magnetic head for a flexible disk device, viewed from the magnetic disk sliding section. In this figure, 1 is a read/write core, 2 is a read/write gap, a read/write coil 3 is wound around the read/write core 1, and a closed core 4 is bonded. 5 is an erase core for reducing positioning errors of the magnetic head with respect to the track of the magnetic disk;
Has an erase gap 6 and a read/write core 1
The erase coil 7 is wound around the erase core 5. Holders 8 and 9 hold the read/write core 1 and erase core 5 from both sides and form surfaces that slide on the magnetic disk.

FIG. 2 is a diagram for explaining a conventional method of removing static electricity noise from a magnetic head for a flexible disk device. Holders 8, 9 are bonded to a holding spring 10, and the read/write core 1, erase core 5, and sliding portions of the holders 8, 9 of the magnetic head come into contact with the magnetic disk plate 14 under pressure from a pressurizing arm 11.

Currently, the holders 8 and 9 are generally made of ceramics with high resistance and high dielectric constant, such as barium titanate, and the holders 9 are coated with a conductive layer of conductive metal by plating or sputtering. 12
is formed. Here, when the magnetic disk plate 14 rotates at high speed, static electricity is generated between the magnetic disk plate 14, the read/write core 1, the erase core 5, and the holders 8 and 9. Since this static electricity becomes a signal noise source, it is grounded to the outside via the conductive layer 12, the conductive adhesive 13, and the holding spring 10.

In this way, the conventional static electricity removal method uses ceramics with high resistance and high dielectric constant to remove the holder 8,
9 and then a conductive layer 12 of conductive metal must be formed on the holders 8 and 9 by plating or sputtering, which has the disadvantage of being expensive.

This invention was made to eliminate the above-mentioned drawbacks, and is intended to eliminate static electricity noise at low cost and efficiently. This invention will be explained below.

FIG. 3 is a front view showing an embodiment of this invention.
By replacing the holders 15 and 16 with conventional high resistance and high dielectric constant materials such as ceramics, the specific resistance is 15kΩ-cm.
The magnetic head is made of a non-magnetic ferrite such as the following Zn-ferrite.

According to this configuration, static electricity generated between the holders 15, 16 and the magnetic disk plate can be suppressed to a low level, and electric charges can be easily grounded without using expensive means such as clamping. Become.
In addition, non-magnetic ferrite is read/write core 1,
Since it is the same type of ferrite as the erase core 5, a uniform state of wear can be obtained even during sliding wear with the disk plate.

In the above embodiment, the holders 15 and 16 are made of non-magnetic ferrite, but the present invention is not limited thereto, and any non-magnetic material that has the same wear rate as the cores 1 and 5 of the magnetic head may be used.

As explained above, in this invention, the holder is made of a non-magnetic material such as Zn-ferrite with a resistivity of 15 kΩ-cm or less, and the magnetic head is constructed.
Since the surface that slides on the magnetic disk plate is formed of the above-mentioned non-magnetic material, the static electricity generated between this surface and the magnetic disk plate can be suppressed to a low level, and the generated static electricity can be easily removed. can. In addition, since the wear of the core of the holder and the magnetic head is the same, even if the core wears, the surface of the holder wears out by the same amount, so not only does it not affect operation, but it also eliminates static electricity during manufacturing. No additional processing is required, which has the advantage of being cheap and easy to manufacture.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the slider portion of a magnetic head for a flexible disk device, and FIG. 2 is a diagram for explaining static electricity noise removal in a conventional magnetic head.
FIG. 3 is a front view showing an embodiment of the present invention. In the figure, 1 is a read/write core, 5 is an erase core, 10 is a holding spring, and 15 and 16 are nonmagnetic ferrite holders. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a magnetic head for a flexible disk device having a holder with a surface that contacts or faces a magnetic recording medium, the holder has a specific resistance of 15KΩ.
1. A magnetic head comprising a non-magnetic material having the same wear rate as the core of the magnetic head at -cm or less.