JPS6043277A - Magnetic disk cartridge - Google Patents

Abstract

PURPOSE:To drive a floppy magnetic disk medium smoothly and prevent the crack growth in the disk medium by providing liners whose diameter is smaller than that of the disk medium in a magnetic disk cartridge which contains the disk medium. CONSTITUTION:The disk medium 3 and liners 2 and 2' sandwiching medium 3 from both surfaces are provided in the magnetic recording cartridge body 1, and the liner 2 is smaller in diameter than the disk medium 3. Therefore, a burr formed at the cut part of the disk medium 3, i.e. outer circumference of the disk medium 3 never contacts the liner 2 to drive the disk medium 3 smoothly. The burr formed when the medium is formed in a discoid shape is often in the cutting direction. For the purpose, the diameter of one of the liners 2 and 2' which has the burr, i.e. 2' is made smaller in diameter than the disk medium 3 to eliminate the influence of the burr.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic disk cartridge that houses a floppy magnetic disk medium formed by forming a magnetic thin film layer on a polymer substrate.

[Technical background of the invention and its problems]

The original floppy magnetic disk medium was manufactured by cutting a highly flexible sheet coated with a non-gold, low magnetic material onto a polymer substrate into a disk shape, as shown in Figure 1. The disk medium 3 was housed in the cartridge 1 together with a liner 2 having a diameter equal to or larger than the primary diameter of the disk medium 3.

In recent years, there has been a demand for higher density information stored in floppy magnetic disk media, and various improvements have been made to floppy magnetic disk media and drive devices. The so-called cloth-shaped body, which has a magnetic layer formed by mixing, dispersing, coating and drying, has reached the limit of high density due to its magnetic properties.

For this reason, we newly added the coercive force as a magnetic material, jKawa magnetization 0)
Large-sized Co-Ni-P, Co-Cr, etc.'
This pillow-shaped medium has started to attract attention; however, J1, which does not contain a binder in the magnetic layer,
1+: Continued note (・i-1 at 1ζ, the flexibility is low, i':+: is cut into a disc shape; ' is high 3. Therefore, disk media, m < !+ 11,
), Paris on the IJ month 1i side is in the cartridge l.
--There is a problem that the disk medium 3 gets caught on the disks 2 and 2 and prevents the movement of the disk medium 3 from moving around the circle 71, or causes the cracks generated during the bending or cutting to grow.

[Purpose of the invention]

The present invention improves the above-mentioned drawbacks of the connection between the magnetic disk medium and the liner, and is provided with a liner that is not affected by the impact of Paris on the cut surface that occurs when cutting the disk medium. The purpose is to provide magnetic disk cartridges.

[Expense of invention]

The present invention provides a magnetic disk cartridge containing a floppy magnetic disk medium formed by forming a magnetic thin film layer on a polymer substrate, in which a liner having a diameter smaller than 1σ diameter of the disk medium is provided in the cartridge. It is something.

[Effects of the Invention] Four Kimoto has discovered that it is possible to solve the problem that occurs when cutting a disk, where the disk comes into contact with the liner and the disk medium cannot be smoothly driven. is in contact with the liner, pfP is cut by cutting 1;
This may cause the cracks on the disk medium that occurred during +r to grow or cause new cracks to occur.
Li,! ] problem can also be solved. ■Furthermore, the burrs create a gap between the disk medium and the liner, resulting in the disk medium being damaged! It is also possible to solve the problem of poor contact between the head and the medium due to the 41f deformation.

[Embodiments of the invention]

The present invention will be described in detail below with reference to the drawings.

FIG. 2 is a plan view 2 showing one embodiment of the present invention and its A-
This is A cross section iA.

Inside the magnetic recording cartridge main body is a disk medium 3 and both! Liners 2, 2 are provided to sandwich the In. The two liners have a diameter smaller than the 1α diameter of the disk/I body 3. Therefore, the cracks generated at the outer circumference of the disk medium 3 do not come into contact with the liner 2, and the disk medium 3 is smoothly driven.

FIG. 3 is a diagram showing another embodiment of the present invention2).

When a medium is cut into a disk shape, the 2!1-prints that occur often occur in the cutting direction. Shi7 Kogatte 3rd
As shown in the figure, 11 targets can also be achieved by making only the diameter of the liner 2' on one side of the liners 2, 2 where the flash has occurred smaller than the diameter of the de-flash medium 3. Note that the liners 2, 2 do not necessarily have to be completely circular, and the length connecting two opposing points on the outer circumference of the liner is called the diameter.

4. '171 of the Drawings] Mere Description FIG. 1 shows a conventional magnetic recording cartridge, and FIGS. 2 and 3 respectively show a magnetic tape J according to the present invention.
-) It is a figure showing an example of a ridge.

l... Magnetic recording cartridge body 2.2... Liner 3... Media, r'l''
Patent Attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In an IJ (magnetic recording car) containing a magnetic disk medium formed by forming a magnetic thin film layer on a polymer substrate, a liner having a diameter smaller than the diameter of the magnetic disk medium is inserted into the cartridge. t'r+f85.
1-sized disk cartridge.