JPS60239979A - Cartridge incorporating magnetic disc - Google Patents

Abstract

PURPOSE:To rotate stably a disc by providing an open part in part of outside periphery of a stabilizing plate and an auxiliary plate, and closing approximately completely the other parts to prevent unstability of the rotation of disc of a conventional cartridge. CONSTITUTION:An open part 25 is formed in a part of peripheral parts (<=1/8 of overall peripheral parts) of a stabilizing plate 18 and an auxiliary plate 20, and this open part 25 is closed by a shutter 27 which is provided on the outside and has a projecting part 26. When this cartridge is set to a disc device, the projecting part 26 of the shutter 27 is pressed by a device-side pin, and the shutter 27 is moved to open the open part 25, and simultaneously, a shutter 22 is rotated to open a head projecting hole 21 and a center hole 29, and a disc 19 can be operated. Air between the stabilizing plate 18 and the disc 19 is flowed out of the open part when the disc 19 is rotated. Thus, unstability of the rotation of disc which is generated in the conventional cartridge is prevented to rotate the disc stably.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention incorporates a flexible magnetic disk, and a stabilizing plate using Bernoulli's principle is provided as part of the case in order to provide stable rotation to the flexible magnetic disk. This invention relates to a cartridge of a thin carrier held in a cartridge.

(b) Background of the Technology and Problems with the Prior Art In recent years, cartridges containing flexible magnetic disks (hereinafter referred to as disks) have been used in magnetic disk drives used in various information processing systems. As recording density increases, cartridges have a sealed structure to prevent dust from entering the cartridge and to prevent manual contact to improve reliability.

Further, in order to make magnetic disk drives thinner and to reduce storage space, cartridges are being made thinner.

Although this sealed structure and thin cartridge utilizes the Bernoulli effect to provide stable rotation to the disk, various problems have arisen. A typical example of this is that the closed structure prevents the air from flowing smoothly, disrupting the smooth rotation of the disk and making it impossible to provide stable rotation.

Conventionally, for example, as in the magnetic disk drive shown in FIG. 1 presented in Japanese Patent Publication No. 47-45534, a shaft directly connected to a motor 5 is placed inside a cover 4 sealed by a back plate 1, side plates 2, and a lid 3. Disc 7 is written on disc 6 several times. By making a hole 8 at or near the center of rotation of the disk, the rotation of the disk 7 allows air to circulate as shown by the dotted line. Note that 9 indicates a magnetic head.

However, in a study conducted by the inventor of the present application, when compared with a device in which the periphery of the top plate 1 and lid 3 are open, the flow of air from the center to the outer periphery of this device is not smooth because there is no outlet. In addition, in the case of a thin structure, the space between the lid 3 and the disc 7 becomes narrower, so air flows between the lid 3 and the disc 7, so the disc 7 is pulled toward the lid 3 to some extent, and the back plate 1 The gap between the disc 7 and the disc 7 widens, making it impossible to obtain stable rotation. Proposals to improve this include, for example, providing a large number of openings on the lid 3 side, or providing a turbulent flow promoting material on the lid 3 side to cause turbulent flow, but none of these are satisfactory. .

(e) Purpose of the Invention The purpose of the present invention is to provide a thin carrier cartridge that maintains a dust-proof structure during storage, and further provides stable rotation to a disk on which data is written when it is attached to a device and data is processed. Our goal is to provide the following.

(d) Structure and object of the invention According to the present invention, at least the stabilizing plate and the auxiliary plate are provided with a through hole in the center of rotation of the disk, and the stabilizing plate is provided with a through hole for head movement. This is achieved by using a cartridge in which a hole is made, a part of the periphery of the stabilizing plate and the auxiliary plate is coated with a gold film, and the other part is almost sealed.

3- That is, in the present invention, the area around the stabilizing plate and the auxiliary plate is sealed to maintain a dust-proof structure during storage, and furthermore, when the disk is installed in a device and data is processed, the air flows from the center of the disk. Openings are provided around the stabilizing plate and the auxiliary plate so that the air will not lose its outlet and flow out from the head protrusion hole, thereby preventing disturbances in the rotation of the disk and creating a stable 71-seat rotary chamber for the disk. Given.

(e) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

Figures 2 to 5 are cross-sectional views illustrating the basic principle of the IJ cartridge of the present invention, Figure 6 is a perspective view showing one embodiment of the cartridge of the present invention, and Figure 7 (A). , (b) are diagrams illustrating the operation of the shutter of the present invention.

In FIG. 2, a disk 11 is placed on the underside of the stabilizing plate 10 on the shaft extension of the motor 12, for example a magnet 13.
It is chucked using.

At the same time as the motor 12 rotates, the disk 11 rotates,
The disk 11, which was initially sagging as shown by the dotted line, now appears as shown by the solid line. At this time, the centrifugal force caused by the rotation of the disc 11 acts on the air near the disc 11, causing it to flow from the inside toward the outside. Disc 11. Since the disc 11 is originally chucked close to the stabilizing plate 10 (0.5 mm or less), an air flow is generated between the disc 11 and the stabilizing plate 10, and an air bearing is formed. As the air flows, the pressure becomes negative and is further drawn toward the disk 11 stabilizing plate 1o. Here, the area of the air supply port 14 of the stabilizing plate 1° is smaller (3- or more), the disk 11 is attracted to the stabilizing plate 10, and the rotation of the disk 11 becomes more stable.

Next, when the auxiliary plate 15 is provided as shown in Fig. 3, air flow will also occur between the disk 11 and the auxiliary plate 15, creating a negative pressure, so the disk 11 will be drawn toward the auxiliary plate 15 to some extent. When a hole 16 is provided in the center of the auxiliary plate 15 as shown in FIG. , the negative air pressure between the auxiliary plate 15 and the disk 11 decreases. This is because the flow rate increases, and the larger the hole 16 is, the closer it is to atmospheric pressure, and the less force that pulls the disk 11 toward the auxiliary plate 15, the more stable the rotation of the disk 11. Become something.

Next, when the surroundings of the stabilizing plate 10 and the auxiliary plate 15 are sealed as shown in FIG. , the disk 11 becomes as shown in FIG. 5, the disk 11 is scratched, and furthermore, the rotation of the motor 12 may stop. Although this phenomenon does not occur if the head protrusion hole 17 is blocked, the head protrusion hole 17 is necessary for the device configuration. If the surrounding area is sealed, the phenomenon of damaging the disk 11 as described above occurs because the air loses its outlet and flows out from the head protrusion hole 17, so it is best to create an opening around the area for air to flow out. . Ideally, the entire circumference would be open, but this is not possible in order to create a dust-proof structure. As a result of investigation by the inventor of the present application, it was possible to obtain satisfactory results even if only a portion of the surrounding area was opened. Since it is best to have the entire circumference open, it was thought that a larger open area would be better, but as a result of research, considering that the open area is to be sealed when not in use, it is better to have a somewhat narrower area. I came to the conclusion that it was good. The value varies depending on the distance between the stabilizing plate 10 and the auxiliary plate 15 and the area of the air inlet of the stabilizing plate 10 and the auxiliary plate 15, but under any conditions it must be 1/8 or less of the entire circumference of the cartridge. I got the result.

This is because when a shutter is provided in each hole or opening, which will be explained in detail later, the narrower the structure, the better and ideal.

As mentioned above, in order to improve reliability, the cartridge needs to have a dust-proof structure. Therefore, the stabilizing plate 10.
The opening of the auxiliary plate 15 and the partially open area around the cartridge must be covered when the cartridge is not in use, and the cover must be removed when the cartridge is in use. The specific car) IJ
FIG. 6 shows an embodiment of the switch.

In FIG. 6, 18 is a stabilizing plate, 19 is a disk, 2
0 is an auxiliary plate, 21 is a head protrusion hole, and 227- is a shutter, which rotates around the shaft 23 on the upper surface of the stabilizing plate 18 to seal the head protrusion hole 21 and the central hole 29 into which the motor shaft is inserted by the stabilizing plate 18. A return spring 24 is provided on the shaft 23. 25 is a stabilizing plate 18
and an open part 25 around a part (1/8 or less of the entire circumference) of the auxiliary plate 20, and this open part 25 is sealed by a shutter 27 having a protrusion 26 provided on the outside. To open the shutter 27, press the protrusion 26 to open the shutter 27 with the arrow a.
, and the return is returned by the return bus 28. Note that the upper surface of the stabilizing plate 18 in the rotation area of the shutter 22 is a recess, the upper surface is covered with a plate 30, and there is also a groove 31 into which a pin for pushing the shutter 22 is inserted.

When the above-mentioned cartridge is installed in the disk device, the protrusion 26 of the shutter 27 is pushed by the pin on the device side as shown in FIG. 25 is opened, another pin on the device side is inserted along the groove 31, and the shutter 22 is opened.
Turn 8- as shown by the arrow to open the head protrusion hole 21. The central hole 29 is opened to enable the disk 19 to operate.

Stabilizing plate 18 and disk 19 rotate as disk 19 rotates.
The air between them flows out from the opening 25 on the outer periphery, so that
The adhesion between the head protrusion hole 21 and the disk 19 is eliminated, and stable rotation of the disk 19 can be obtained. Naturally, the head and disk 19 surface will not be damaged.

Also, if the cartridge is removed from the device, the shutter 27
．． 22 and the device side pin are released, and the shutter 27.
22 is automatically returned by return springs 28 and 24 to seal the cartridge when not in use. In addition, Fig. 7 (
B) shows the return state of the shutter 27, with one of the return springs 28 being fixed to the shutter and the other to the stabilizing plate 18 side.

(f) Effects of the Invention As explained in detail above, the cartridge of the present invention has an open part provided on a part of the outer periphery of the stabilizing plate and the auxiliary plate, and further closes the open part with a shutter to seal the cartridge during storage. When in use, the shutter is opened and the air that has flowed in from the center between the stabilizing plate and the disk flows out to the outer periphery, which allows the disk to rotate stably without becoming unstable like in conventional cartridges. rotation is obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional magnetic disk device, FIGS. 2 to 5 are diagrams for explaining the basic principle of the cartridge of the present invention, and FIG. 6 is an embodiment of the cartridge of the present invention. The perspective views shown in FIGS. 7(A) and 7(B) are diagrams for explaining the operation of the shack of the present invention. In the figure, 10 and 18 are stabilizing plates, 11 and 19 are flexible magnetic disks, 12 is a motor, 13 is a magnet, 14 is an air supply port, 15.20 is an auxiliary plate, 16 is a hole, and 17.21 is a head protrusion. 22.27 is a shutter, 23 is a shaft, 24.28ij is a return spring, 25 is an opening, 26 is a protrusion, 29 is a central hole, 30 is a plate, and 31 is a groove. 11- Fig. 1 Fig. 2 Sencha 3 *4 Fig. 5 @ No. Otsupi 2θ la \ /゛\ \ 2 \ ・, ′-〜 ＼ to ′ 1, 37 ′ ”ts liga l a \ \ 27n I -11112q l graduate 1, \゛\ t PA 112.p,, Cl 1 Hl , 1 〆llll 1~ - /1 \, -,, / , 7/' 2 \1.28 / l / \27 /' /, / 1.\ --\ \\ / / Figure 7 (a) (b) 6

Claims (3)

[Claims] (1) In a cartridge of a thin carrier which has a stabilizing plate and an auxiliary plate, and a flexible magnetic disk is interposed between the stabilizing plate and the auxiliary plate and is made to rotate, at least the stabilizing plate and the auxiliary plate A through hole is formed in the auxiliary plate at the center of rotation of the magnetic disk, a through hole for head movement is formed in the stabilizing plate, and an opening is provided in a part of the periphery of the stabilizing plate and the auxiliary plate. , a cartridge with a built-in magnetic disk characterized by the fact that the other parts are almost sealed. (2) A car incorporating a magnetic disk according to claim 1, wherein each of the through holes and openings are covered with a shutter that can be opened and closed. (3) The opening part is 17 mm around the entire circumference of the stabilizing plate and the auxiliary plate.
Cartridge 0 incorporating a magnetic disk according to claim 1, characterized in that the magnetic disk is 8 or less.