JPH03269822A - Magnetic disk medium and its production - Google Patents

Abstract

PURPOSE:To eliminate sticking of a core slider to the surface of a magnetic disk medium when a magnetic head starts to float by providing a retreating area for a magnetic head in a manner that the retreating area has a lubricating layer of smaller thickness than in the recording area or CSS area. CONSTITUTION:The lubricating layer 3 is formed on a magnetic film layer 2 by coating with a sprayer, etc., to larger thickness than the required film thickness of the lubricating layer 3. Then the whole surface of the lubricating layer is wiped with a wiper to form a specified film thickness. Further, the inner circumference area is wiped to form a lubricating layer 3a thinner than the lubricating layer 3. The outer circumference area having the lubricating layer 3 is used as the recording area in which information is recorded from the outer circumference and as a CSS area for a magnetic head, while the inner area having the lubricating layer 3a is used as a retreating area for the magnetic head. The head is moved to the retreating area just before stopping the disk device to avoid sticking of the core slider to the disk medium surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk medium, and particularly to a lubricating film layer of a magnetic disk medium used in a magnetic disk device.

[Conventional technology]

Conventionally, in a magnetic disk device using this type of magnetic disk medium, the core slider of the magnetic head, which was in contact with the surface of the magnetic disk medium, slides and floats when the device is started, and also floats when the device is stopped. It uses a so-called contact start-stop (hereinafter referred to as C8S) floating method in which the core slider slides on the surface of the magnetic disk medium and comes to rest.Usually, the C8S operation moves the inner circumferential side of the magnetic disk medium. C to only do
The 8S area is used, and the outer circumferential side is used as a recording area for recording information. Furthermore, in order to improve the durability against sliding of the core slider in magnetic disk media, a lubricating film layer of a constant thickness is formed by the method described below.

FIG. 2 is a cross-sectional view showing a conventional magnetic disk medium, where 1 is a non-magnetic support and is made of high-purity aluminum or glass, and 2 is a magnetic film layer for recording information. It is made of ferromagnetic powder and is formed on both sides of the support 1 to a predetermined thickness. Reference numeral 3 denotes a lubricant film layer, and a lubricant is applied on the magnetic film layer 2 by a spray device W (not shown) or a spin coating device (not shown) in advance so that the thickness of the lubricant film layer is lower than the required thickness. A thick coating is applied, and then the entire coated surface is wiped using a wiping device (not shown) to form a lubricating film layer of a predetermined thickness.

E Problems to be Solved by the Invention] In the conventional magnetic disk medium described above, the thickness of the lubricating film layer is constant over the entire surface, and if the film thickness is thick, the core slider and the magnetic disk medium surface may come into contact when the magnetic head starts flying. This has the drawback of causing adsorption, and if the thickness of the lubricating film layer is made thinner in order to prevent this adsorption, the durability against C8S operation is reduced, which is a contradictory result.

[Means to solve the problem]

The present invention provides (1) a magnetic film layer and a lubricant film layer having a predetermined film thickness on a non-magnetic support, which are used in a magnetic disk device that employs a contact start-stop magnetic head flying system; In a magnetic disk medium formed in sequence, the first lubricant film layer is formed on an outer peripheral region of the magnetic disk medium, and the first lubricant film layer is formed on an inner peripheral region of the magnetic disk medium. The second lubricating film layer is thinner than the second lubricating film layer.

(2) A method for manufacturing a magnetic disk medium according to claim (1), comprising: coating a surface of the magnetic film layer with a lubricant using a spraying means or a spin coating means, and then: The first lubricant film layer is formed on the surface using a wiping means, and the second lubricant film layer is further formed on the inner peripheral region using the wiping means.

(3) A method for manufacturing a magnetic disk medium according to claim (1), wherein the surface of the magnetic film layer is coated with a lubricant using the spraying means or the spin coating means, and then coating the inner peripheral region coated with the lubricant using the wiping means;
forming a lubricant film layer on the outer peripheral region using the spraying means or the spin coating means, and then coating the outer peripheral region with a lubricant using the wiping means. It is characterized by forming.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the magnetic disk medium of the present invention. In FIG. 1, the IT rules for the non-magnetic support 1 and the magnetic film layer 2 and the method for manufacturing them are the same as those of the prior art. Reference numeral 3 denotes a lubricant film layer, which is coated on the magnetic film layer 2 with a thickness thicker than the required lubricant film layer in advance using a spray device (not shown) or a spin coating device (not shown) for applying lubricant. The entire surface of the coated lubricant film layer is wiped using a wiping device (not shown) to form a predetermined thickness of the lubricant film layer 3.Furthermore, only the inner peripheral area is similarly wiped to remove the lubricant film layer. Lubricating film layer 3 thinner than the film thickness of 3
form a.

Next, other embodiments of the magnetic disk medium of the present invention will be described. First, the process up to the formation of the magnetic film layer 2 is performed in the same manner as in the above-described embodiment. Then, the entire surface of the magnetic film layer 2 is coated with a lubricating film layer 3a using a spray device or a spin coating device.
A lubricant film layer 3a is formed by coating only the inner peripheral region with a lubricant film layer thicker than the film thickness of . Further, the outer circumferential region is coated with a lubricant film layer thicker than the lubricant film layer 3, and the outer circumferential region is wiped to form the lubricant film layer 3.

In this way, two film thicknesses consisting of the lubricant film layer 3 and the lubricant film layer 3a are provided, and the outer circumferential area having the lubricant film layer 3 is used as a recording area for recording information from the outer circumferential side and a magnetic head C.
8S area, and the inner peripheral area having the lubricating film layer 3a is used as a retreat area for the magnetic head.

〔Effect of the invention〕

As explained above, according to the magnetic disk medium of the present invention, by providing a magnetic head evacuation area having a lubricating film layer thinner than the recording area and the C8S area, the magnetic head By moving the core slider, it is possible to eliminate adhesion between the core slider and the magnetic disk medium surface when the magnetic head starts flying, and also,
It is possible to increase the thickness of the lubricating film layer in the recording area and the C8S area, and there is an effect that the durability against the C8S operation can be dramatically improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the magnetic disk medium of the present invention, and FIG. 2 is a sectional view showing a conventional magnetic disk medium. l...Nonmagnetic support, 2...Magnetic film layer, 3.3a
...Lubricating film layer.

Claims (3)

[Claims] (1) Used in magnetic disk drives that employ a contact start/stop magnetic head levitation system,
In a magnetic disk medium in which a magnetic layer and a lubricant layer having a predetermined thickness are sequentially formed on a non-magnetic support, the first lubricant layer is formed in an outer peripheral region of the magnetic disk medium. and a second lubricant film layer formed in an inner peripheral region of the magnetic disk medium and having a thickness thinner than that of the first lubricant film layer. (2) A method for manufacturing a magnetic disk medium according to claim (1), wherein the surface of the magnetic film layer is coated with a lubricant using a spraying means or a spin coating means, and then: A magnetic disk medium characterized in that the first lubricant film layer is formed on the surface using a wiping means, and the second lubricant film layer is further formed on the inner peripheral region using the wiping means. manufacturing method. (3) A method for manufacturing a magnetic disk medium according to claim (1), wherein the surface of the magnetic film layer is coated with a lubricant using the spraying means or the spin coating means, and then coating the inner peripheral area coated with the lubricant with the lubricant using the wiping means to form the second lubricant film layer; and further using the spraying means or the spin coating means. A method of manufacturing a magnetic disk medium, characterized in that the outer peripheral region is coated with a lubricant, and then the wiping means is used to form a first lubricant film layer on the outer peripheral region.