JPS6276006A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the decrease of output and to provide a higher recording density and longer life by providing a recording and reproducing head and pseudo heads of which the surfaces to contact with a magnetic recording medium are formed to curved surfaces in front of said head. CONSTITUTION:The pseudo heads 8, 9 are disposed in front of the recording and reproducing head 1 in the direction X where where the magnetic recording medium 7 advances so as to sandwich the medium 7 therebetween. The heads 8, 9 consisting of ceramics such as Al2O3-TiC, crystallized glass, nonmagnetic ferrite or high-hardness material such as sapphire and the side thereof to contact with the medium 7 is finished and polished to a specular surface so as to have the curved surface having 30-300mm radius of curvature. The heads 8, 9 are in contact with the medium 7 under 5-20g load. The decrease of the output is thereby prevented and the recording density is improved; in addition, the life is made longer and the reliability is made higher.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording and reproducing apparatus suitable for recording and reproducing information at high density, particularly by causing a magnetic recording medium to run in contact with a recording and reproducing head.

BACKGROUND OF THE INVENTION In recent years, research on high-density recording has been actively conducted in the field of magnetic recording. In the conventional longitudinal recording method, which forms residual magnetization parallel to the surface of a magnetic recording medium such as a magnetic tape or magnetic sheet, it is necessary to increase the coercive force of the magnetic recording medium, make the film thinner, and increase the saturation magnetic flux density. In addition, by narrowing the magnetic gap at the magnetic head and increasing the saturation magnetic flux density of the head material, it is possible to achieve high-density recording.

On the other hand, forming residual magnetization in the thickness direction of the magnetic recording medium,
The so-called perpendicular magnetization recording method is expected to be a method that compensates for the drawbacks of the longitudinal recording method. The reason for this is that in the longitudinal recording method, the self-demagnetizing field becomes larger as the recording signal becomes shorter in wavelength, whereas in the perpendicular recording method, the self-demagnetizing field becomes smaller.

A typical example of the longitudinal recording method will be explained below with reference to FIG. In FIG. 3, reference numeral 101 denotes a ring-type recording/reproducing head, which is composed of a magnetic core 102 made of Ni--Zn ferrite, etc., and a recording/reproducing coil 103. 10.1 is a magnetic recording medium, γ-Fly! 03, CrO2, Co-rF12
03, has residual magnetization in the longitudinal direction of the magnetic recording layer made of CoNi or the like.

Recording and reproduction can be performed by running the magnetic recording medium 104 in contact with the magnetic core 102.

Next, a typical example of the perpendicular recording method will be explained with reference to FIG. Figure 4 shows Japanese Patent Publication No. 57-17281 and Japanese Unexamined Patent Publication No. 5
This figure shows a configuration using a main pole excitation type perpendicular head that is improved based on the perpendicular recording method disclosed in Japanese Patent No. 8-139323.

The vertical head 105, that is, the recording/reproducing head is mounted on the nonmagnetic substrate 1.
06, a main magnetic pole film 107 formed on the non-magnetic substrate 106 and made of a high permeability magnetic thin film, and a recording/reproducing coil 1 wound around the non-magnetic substrate 106 and the main magnetic pole film 107.
08, a magnetic core 109 for enhancing magnetic flux circulation efficiency and magnetic shielding effect, and a magnetic auxiliary block 110 facing the magnetic core 109. 11
1 is a magnetic recording medium having magnetic anisotropy in the thickness direction of a magnetic recording layer made of CoCr, Ba ferrite, or the like.

The magnetic recording medium 111 is sandwiched between the magnetic core 109 and the magnetic auxiliary block 110, and recording and reproduction can be performed by running the magnetic recording medium 111 in contact with the magnetic core 109.

In any of the above conventional recording systems, if the spacing between the recording/reproducing head 101.105 and the magnetic recording medium 104.111 is large, not only will the output decrease, but the upper limit of the recording density will be determined. To achieve recording density, this spacing must be made as small as possible. In order to reduce this spacing loss, the surface properties of the magnetic recording media 104, 111 are improved, and the magnetic recording media 104, 111 and the recording/reproducing head 101.
The contact pressure of 105 is increased.

Problems to be Solved by the Invention However, the surface of the magnetic recording medium 104.11.1 is contaminated with foreign matter (dust) from manufacturing equipment and the air, making it difficult to make the surface completely flat. I can't. Therefore, the magnetic recording medium 104, 111 is
When running in contact with 01.105, deposits are caught between them. This deposit mixes with the lubricant applied to the surface of the magnetic recording medium 104, 111, and once it adheres to the recording/reproducing groove 101, 105, it is difficult to remove and gradually accumulates over time of use. There is.

Therefore, the recording and reproducing heads 101 and 105 eventually rise up, and the recording and reproducing heads 101 and 105 and the magnetic recording medium 1
A spacing occurs between 04.111 and 04.111. As a result, the output decreases and an upper limit to the recording density is determined. Also, due to this deposit, the recording/reproducing head 101.1
05 and the magnetic recording medium 104, 111, which not only results in a decrease in output, but also shortens life and reduces reliability.

Therefore, the present invention can prevent the spacing between the recording/reproducing head and the magnetic recording medium, and also prevent the recording/reproducing head and the magnetic recording medium from being scratched by foreign matter or other foreign matter attached to the magnetic recording medium. Provided is a recording/reproducing device which can prevent a decrease in output, improve recording density, extend life, and improve reliability. This is what I am trying to do.

Means for solving the problems The technical means of the present invention for solving the above problems are as follows:
It is equipped with a recording/reproducing head and a pseudo head which is disposed in front of the recording/reproducing head in the direction in which the magnetic recording medium enters and whose contact surface with the magnetic recording medium is formed into a curved surface.

According to the present invention, with the above-mentioned configuration, deposits such as foreign matter attached to the surface of the magnetic recording medium encounter the pseudo head before reaching the recording/reproducing head. By crushing the
Deposits can be removed or reduced. Therefore, spacing between the recording/reproducing head and the magnetic recording medium can be prevented, and damage to the recording/reproducing head and the magnetic recording medium can be prevented.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, a recording/reproducing apparatus according to a first embodiment of the present invention will be described. FIG. 1(A) is a sectional view, and FIG. 1(B) is an enlarged view of the main part. In FIG. 1(A), a recording/reproducing head 1 is constructed in the same manner as the conventional example shown in FIG. 4 above. That is, a non-magnetic substrate 2, a main magnetic pole film 3 formed on the non-magnetic substrate 2, a recording/reproducing coil 4 wound around the non-magnetic substrate 2 and the main magnetic pole film 3, a magnetic core 5 and It is composed of a magnetic auxiliary block 6 facing the magnetic core 5. Reference numeral 7 denotes a magnetic recording medium, which is constructed similarly to the conventional example shown in FIG. 4 and runs in the direction of the arrow. 8
．． Reference numeral 9 denotes a pseudo head, which is disposed in front of the recording/reproducing head 1 in the direction of entry of the magnetic recording medium 7, so as to sandwich the magnetic recording medium 7 therebetween. The pseudo head 8.9 is made of Al
103-TiC1 is made of crystallized glass, ceramics such as non-magnetic ferrite, or a highly hard material such as sapphire, and the side in contact with the magnetic recording medium 7 has a radius of curvature of 30 mm.
It has been polished to a mirror finish with a curved surface of 300m+n.

These pseudo heads 8 and 9 are in contact with the magnetic recording medium 7 with a weight of 5 to 207.

The operation of the above configuration will be described below. The magnetic recording medium 7 travels in the direction of the arrow x and first contacts the pseudo nodal 8.9, and then contacts the recording/reproducing head 1. Then, as shown in FIG. 1(B), the deposits 10 such as foreign matter adhering to the magnetic recording medium 7 come into contact with the pseudo head 9, so that the left end of the pseudo head 9, that is, the magnetic recording medium 7 enters. Deposits on the direction side. Alternatively, the attached matter 10 is crushed by the destructive force of the pseudo head 9. Therefore, it is possible to prevent the deposit 10 from adhering to the recording/reproducing head 1.

Next, a recording/reproducing apparatus according to a second embodiment of the present invention will be described.

FIG. 2 is a cross-sectional view of the pseudo head section in this embodiment, and the recording/reproducing head portion is omitted, but the recording/reproducing head has the same configuration as that in FIG. 1 of the first embodiment. There is. The pseudo hemlock 8.9 in FIG. 2 is composed of two or more types of composite substrates made of different materials. That-
As an example, in the pseudo head 8.9, a substrate 11 made of a high hardness material and a substrate 12 having solid lubricant properties are alternately laminated and bonded in the running direction of the magnetic recording medium 7, and the side in contact with the magnetic recording medium 7 has a curved surface. Polished to a mirror finish. Specifically, as the hardness substrate 11, At203-
Ceramics such as TiC crystallized glass, nonmagnetic ferrite, or sapphire are used, and the solid lubricant substrate 12 is made of amorphous carbon, graphite, or the like.

The operation of the above configuration will be explained below.

An attachment 10 such as a foreign substance on the magnetic recording medium 7 is a pseudo head 9.
The fact that the recording/reproducing head 1 can be protected from the deposits 10 by depositing them on the entrance direction side of the magnetic recording medium 7 is the same as in the first embodiment, but in this embodiment, in addition to this, Since a portion of the pseudo head 8.9 has solid lubricating properties, the surface of the magnetic recording medium 7 is slightly lubricated, and therefore, the movement relative to the recording/reproducing head 1 can be stabilized.

In the first and second embodiments described above, the pseudo heads 8.9 are made of the same material and are used as a set. The pseudo heads 8 and 9 made of different materials shown in FIG. 2 may be used in combination.

Effects of the Invention As described above, according to the present invention, since the pseudo head is provided in front of the recording/reproducing head in the direction in which the magnetic recording medium enters, it is independent of the recording/reproducing head. It is possible to remove adhesion such as foreign matter by attaching it to the pseudo head or destroying it before it reaches the recording/reproducing head, thereby preventing spacing between the recording/reproducing head and the magnetic recording medium. It is possible to prevent the recording/reproducing head and the magnetic recording head from being scratched.

Therefore, it is possible to prevent a decrease in output, improve recording density, extend life, and improve reliability.

[Brief explanation of drawings]

FIGS. 1(A) and 1(B) show a recording/reproducing device according to a first embodiment of the present invention, FIG. 1(A) is a sectional view, and FIG. 1(B) is a sectional view.
2 is a sectional view of a pseudo head and a magnetic recording medium in a second embodiment of the present invention, and FIGS. 3 and 4 are sectional views of a conventional recording/reproducing device, respectively. be. 1... Recording/reproducing head, 7... Magnetic recording medium, 8.
9...Pseudo head. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 1 (A) (β)

Claims (3)

[Claims] (1) Recording/playback head, and for this recording/playback head,
1. A recording/reproducing device comprising a pseudo head disposed in front of the magnetic recording medium in the direction of entry thereof, and having a curved surface on the side in contact with the magnetic recording medium. (2) The recording/reproducing device according to claim 1, wherein the pseudo head is made of a highly hard material. (3) The recording/reproducing apparatus according to claim 1, wherein the pseudo head is formed by alternately laminating high-hardness substrates and solid lubricant substrates in the running direction of the magnetic recording medium.