JPS6070569A - Magnetic disc cartridge - Google Patents

Abstract

PURPOSE:To stabilize the floating characteristic of a magnetic head in any position on a magnetic disc by providing an air flow hole and a groove communicating to the hole radially on a clamping plate and a disc hub. CONSTITUTION:The air flow hole 17 is formed on the center part of the clamping plate 5 and plural air flow grooves 18 communicating to the air flow hole 17 are radially formed on the lower surface of the plate 5. In addition, the air flow hole 19 communicating to the air flow hole 17 and plural radical grooves 20 communicating to the outer peripheral part of the mounting surface of the magnetic disc 4 are formed on the disc hub 3. When the magnetic disc 4 is rotated in said magnetic disc cartridge, air is made to flow into the air flow holes 17, 19 and then flow into the upper and lower surfaces of the magnetic disc 4 through respective air flow grooves 18, 20 by its centrifugal force. Thus, the floating characteristics of the magnetic head can be stabilized in any position on the upper and lower surfaces of the magnetic disc 4 by the flowing function.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to improvements in magnetic disk cartridges.

(Prior art) Magnetic disk cartridges have almost the same diameter as floppy disks, have a larger storage capacity, are driven at higher speeds, and can access the storage surface with a floating head, making them easier to use than floppy disks. It is attracting attention as a storage medium for small computers that can replace disks.

In the mechanism that floats the head, when the magnetic disk is rotated at high speed, the air between the magnetic disk and the case is pushed from the center to the periphery.

Due to this stable air flow, the head flies under dynamic pressure due to the air 70 in the circumferential direction accompanying the rotation of the magnetic disk, and the gap between the head and the magnetic disk is approximately 0.3μ.
Float while maintaining a gap of m1. At the same time, it is said that contaminants such as minute dust that have entered the case are blown away by the air flow before the magnetic head enters the cartridge case.

In order to achieve this new function, this type of magnetic disk cartridge 1-ridge allows air to enter from the magnetic head insertion port of the cartridge case, and is installed on one side of the case to generate air flow as the magnetic disk rotates. The structure is such that air is discharged from the air discharge passage.

However, it is extremely questionable whether the airflow is actually occurring uniformly in each part of the case.

In particular, the disk hub and clamp plate are located at the center of the magnetic disk, and their thickness varies.
The inventors have confirmed that the air 70- is unstable around the center.

This unstable air flow is particularly likely to occur near the center of A3.
This creates a situation in which it is difficult to reliably remove contamination that has formed on the surface of a magnetic disk and has an adverse effect on the flying characteristics of the magnetic head. The purpose is to ensure that the flying characteristics of a magnetic head are stable at any position on the disk and that contamination is reliably removed.

(IM construction of the invention) In order to achieve the above object, the present invention provides a clamp play I
- An air circulation hole is formed in the center of the disk hub, and a plurality of grooves communicating with the air circulation hole are formed radially on the contact surface with the magnetic disk hub.

(Embodiment) FIGS. 1 to 3 show a ridge on a magnetic disk car 1 to which the present invention is applied.

In each figure, this magnetic disk car 1-ridge includes a lower cover 18 constituting a cartridge case, and a disk hub that also serves as an arch core whose lower surface is fitted into an opening 2 formed in the center of the lower cover 18. 3, a magnetic disk 4 whose center is positioned on the disk huff 3, a clamp plate 1-5 that clamps and fixes the magnetic disk 4 between the disk hub 3 and the disk hub 3 via screws B, and It consists of a latching lever 6 that engages with the peripheral flange portion 3a, a leaf spring 7 that pushes the latching lever 6 against the inner bottom surface of the lower cover 18, and the upper cover 1b.

Inside the lower cover 18, a concentric partition wall 8 is formed along the outer peripheral edge of the magnetic disk 4.

An exhaust passage 1o communicating with an exhaust port 9 formed on one side of the cover 1 is formed at one end thereof.

Further, an opening 11 through which a magnetic head is inserted is formed in the center of one side of the lower cover 18, and a notch 8a is also formed in the partition wall 8 in communication with this opening 11. An LJ shutter 12 is installed between the frontage 11, the Jul air opening 9, and the partition wall 8.

A lever 13 for opening and closing is provided on one side of the shutter 12.
The threads are intertwined. This lever 13 is moved by a spring 14 to position the shutter 12 in one direction, thereby causing the opening 1
1J3 and exhaust port 9 are closed.

A groove 3b is formed on the protruding end of the lower surface of the disc hub 3 to protrude from the peripheral edge of the frontage portion 2 and engage with the vertical wall 2a in a labyrinth shape, and this tie 31)
A plastic ring 15 is fitted to the inner peripheral portion of the ring 17, and in a normal fixed state, the inside of the space 17 is airtightly opened by fitting the ring 15 with the stand W2a. Further, a center positioning hole 3a is formed in the center of the lower part, and the diameter of the center positioning hole 3a increases toward the bottom side, and the upper part of this hole 3C is formed in the lid 1G.
There is a J: sticker on it.

An air circulation hole 17 is formed in the center of the clamp plate 5, and the lower surface of the clamp plate h5 has one end communicating with the air circulation hole 17 and the other end communicating with the outer periphery thereof. A plurality of communicating air circulation grooves 18, 18... are formed radially.

Further, a communication hole 19 is formed in the center of the upper part of the disk hub 3 and communicates with the communication hole 17, and one end is connected to the communication hole 19 at the periphery of the upper surface of the disk hub 3, and l
[(A plurality of free grooves 20, 20... are formed whose ends communicate with the circumferential portion of the γi seat surface of the magnetic j'r disk 4.

When the magnetic disk cartridge configured as shown below is loaded into the disk driver, the image shown on the right side of FIG.
, A release bin P protrudes from the bottom of the sea urchin - Holding the CC hook lever G, 'j bin (press 3a j-i)'
, J, and the engagement of the re-disk hub 3 is released. Also, the bottom of this j゛ishap 3 is the spindle rotor 30.
It is attracted to the tip of the 5 sill:J/, : by the electromagnetic clamp tourer 31, and in this state it is rotated by the rotation of the motor 30. The lever 13 is further rotated and the shutter 12 is moved in the direction of the arrow in FIG. 3, thereby opening the frontage 11 and the exhaust port 9 of the case.

In this state (when the magnetic disk rotates), air is swept from the center to the periphery as described above, and contamination is removed.

Furthermore, a head (not shown) is inserted from the gap 1 section 11 and supplied to the surface of the magnetic disk 4, and operations such as writing and reading are performed.

When the magnetic disk 4 rotates in the direction of the arrow in FIG. 3, the cartridge 1-ridge case and the magnetic disk 4 are
The air between them is blown away in the direction of arrow A, and flows along the inner periphery of the sea urchin partition wall 8 from the discharge passage 10 in the direction of the arrowhead (not shown).
l is discharged to outlet 9.

As a result, there is a negative pressure in the central part, but the air circulation holes 1'l and 18 are formed in this part as described above.
The air circulation groove 18.2 is twisted due to the centrifugal force.
Due to this circulation effect, air flows reliably and stably from the center of rotation of the magnetic disk 4 along the outer radial direction from the center of rotation of the magnetic disk 4. However, the flying characteristics of the magnetic head can be stabilized at any position on the upper and lower surfaces of the magnetic disk 4.

In addition, if the force ~ [- ridge is not in use or contamination occurs within the driver, the magnetic disk 4 (=
Even if J ff occurs, the centrifugal force caused by the rotation and stable air circulation will instantly exhaust the J ff.

In the above embodiments, the radial grooves are formed in a straight line from the center to the periphery, but it goes without saying that they may be formed in a curved shape with respect to the rotational direction or the opposite direction.

(Effects of the Invention) In this invention, (a) small air circulation holes and radial grooves are provided (a) to stabilize the top characteristics of the magnetic head no matter where it is placed on the top and bottom surfaces of the magnetic disk. Furthermore, even if contamination that has entered the case adheres to the surface of the magnetic disk, it is immediately blown away by the air 70-, so that the surface of the magnetic disk can be cleaned. Therefore, in the present invention, the head and storage surface are not damaged, and access errors caused by these can be prevented.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a magnetic disk cartridge according to the present invention, FIG. 2 is a sectional view showing a state in which the magnetic disk cartridge is in the same phase, and FIG. 3 is a plan view thereof. 1a...Lower cover, 11)...Upper cover 2...
...Front area 3...Disk hub 4...Magnetic disk 5...Clamp plate 1
7...Air circulation hole, 1...Air circulation hole 18.20...Air circulation groove Applicant: Seiko Tateki Co., Ltd. Agent Mogami Tsutomu

Claims (1)

[Claims] (1) Car 1 - The groove formed on the bottom of the ridge case [1]
J5 is a magnetic disk cartridge equipped with a disk hub that also functions as an armature that protrudes from the armature, a magnetic disk whose rotation center is positioned on this disk hub, and a clamp plate that holds the magnetic disk between it and the disk hub. , a magnetic disk car characterized in that an air circulation hole is formed in the center of the clamp plate J3 and the disk hub, and a plurality of grooves passing through the air circulation hole are formed radially on the contact surface with the magnetic disk. 1~Rituji.