JPS60202579A - Magnetic disc cartridge - Google Patents

Abstract

PURPOSE:To decrease the number of parts and to attain a thin structure of a magnetic disc cartridge by using an elastic member which engages a sleeve in a taper form, and also presses a disc hub to the opening fringe of the bottom surface of a case and at the same time to eliminate a play between the disc hub and the case opening part to prevent the generation of contamination. CONSTITUTION:A sleeve 16 having an engagement hole 16a opening toward its upper part is provided at the center part of an upper case 11. The head part 17a of a shaft 17 is fitted in a taper form into the hole 16a. The lower part of the shaft 17 is put through an attachment hole 12a through which the center of a disc hub 12 passes. A flange 18 which rubs the inner circumferential part of the hole 12a is unified at the lower edge of the shaft 17, and a compression coil spring 19 is set at the outer circumference of the shaft 17 between the flange 18 and the upper part of the hole 12a. The hube 12 is energized upward by the spring 19 when a cartridge is not used, and a flange part 15a has a close touch to the fringe of an opening part 10a. Thus both the hub 12 and a magnetic disc 13 are fixed at the center of the case 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvements in magnetic disk cartridges.

(Prior Art) As shown in FIG. 1, the conventional structure of a magnetic disk cartridge includes a magnetic disk 2 rotatably housed in a plastic cartridge case 1, and a magnetic disk 2.
A disc hub 3 that also functions as an armature and protrudes from an opening 1a formed in the bottom of the case 1 has a fixed rotation center.
and at least a pair of screws whose rear ends are pressed against the inner bottom surface of the case 1 by the leaf spring 4 and whose tips are pressed into contact with a flange formed on the periphery of the disk hub 3 to fix the disk hub 3 to the inner bottom surface of the case 1. It consists of a latching lever 5.

When the magnetic disk cartridge is not in use (shown on the left side in the figure), the disk hub 3 is held and fixed in the case 1 together with the magnetic disk 2 by the spring elasticity of the latching lever 5. When the cart thread case 1 is loaded into the magnetic disk driver, the holding pin 5a of the latching lever 5 is pushed up by a release pin provided inside the driver, releasing the pressure on the disk hub 3. At the same time, a magnetic clutch provided at the tip of the spindle motor 7 engages with the lower end surface of the hub 3, allowing the magnetic disk 2 to rotate.

However, the cartridge with this configuration requires a large number of parts to clamp the magnetic disk 2, and is difficult to assemble.

Adjustment takes a lot of time and costs are high.

In addition, since the spring 4 and the latching lever 5 are stacked in the thickness direction of the magnetic disk 2, the case 1 must be sufficiently thick, and the overall thickness of the magnetic disk 2 must be made thinner. could not.

Furthermore, in this type of magnetic disk, there is a large dimensional difference between the inner diameter of the opening 1a and the outer diameter of the disk hub 3, so a large gap is formed between the two, and the magnetic disk 2 and disk hub 3 are held together by a spring. Although the disk hub 3 is fixed to the inner bottom of the case 1 by force, if it is handled roughly or shaken strongly, the disk hub 3 will wobble, and this wobbling may cause contamination due to wear or open gaps in the joints, causing dust and dirt to form. This causes contamination to occur in case 1.

In this type of magnetic disk cartridge, the occurrence of contamination is a major problem.

In other words, when a magnetic disk is driven to rotate at high speed, the dynamic pressure between the magnetic head and the magnetic disk causes the gap between the magnetic head and the magnetic disk to be approximately zero.
Because it is designed to float while maintaining 1llll of 3μ- to 0.5μ-, if minute dust enters the cartridge case, it may cause a **, head crash, or access error. This may cause

(Objective of the Invention) An object of the present invention is to reduce the number of parts and achieve thinning, and also to eliminate looseness between the disk hub and the opening of the case, thereby preventing the occurrence of contamination.

(Structure of the Invention) In order to achieve the above object, the present invention provides a sleeve that is provided at the center of the upper surface of the case and has an engagement hole that expands upward, and that engages with the sleeve in a tapered shape,
A shaft is inserted through a mounting hole formed through the center of the disc hub, and the shaft is inserted between the lower end of this shaft and the upper end of the mounting hole, and the disc hub is biased upward to move the disc hub to the periphery of the opening on the bottom of the case. It is characterized by the provision of an elastic material for pressing.

(Embodiment) FIG. 2 shows the overall structure of a magnetic disk cartridge according to the present invention, and FIGS. 3(a) and 3(b) show the main structure thereof.

In the figure, 10 is a shallow container-shaped lower case made of synthetic resin, and 11 is an upper case that airtightly covers the upper opening of the lower case 1o.

Disposed within the case are a disk hub 12 and a magnetic disk 13 whose center portion is fixed to the disk hub 12 via a mounting plate 14 . Further, a fixing plate 15 which also serves as an armature is integrally provided on the lower surface of the disc hub 12.

A flange 15a is formed on the fixing plate 15 and comes into contact with the outer periphery of an opening 10a formed at the center of the lower case 1o. That is, contrary to the conventional structure, the disc hub 1-2 is in a free state when it is lowered inside the case, and when it is raised, the flange 15a abuts and is fixed to the lower surface of the lower case 1o.

Further, a sleeve 16 is integrally provided in the center of the upper case 11 and has an engagement hole 16a that is enlarged at the top. A shaft 17 is inserted through the sleeve 16, and its head 17a
is engaged in the engagement hole 16a in a tapered manner. ring 17
The lower part is a mounting hole 12 that passes through the center of the disc hub 12.
It is inserted into a. In addition, there is a mounting hole 1 at the lower end of the shaft 17.
A flange 18 that slides into contact with the inner peripheral portion of 2a is integrated. A compression coil spring 19 is arranged on the outer periphery of the shaft 17 between the flange 18 and the upper part of the mounting hole 12a.

Due to the spring force of this spring 19, the left side and third
When the cartridge is not in use as shown in FIG.
A disk hub 12 and a magnetic disk 13 are fixed at the center inside the case.

Note that 20 in the figure is a lid that covers the upper opening of the engagement hole 16a.

When the cartridge configured as described above is loaded into a magnetic disk drive as shown on the right side of Fig. 2 and Fig. 3(b), the reference shaft 21 provided at the tip of the spindle motor (not shown) will align with the mounting hole. It protrudes into the shaft 12a, presses the lower end of the shaft 17, and raises it as shown by the arrow.

On the other hand, a magnetic clutch 2 provided on the periphery of the reference shaft 21
2 sucks the fixing plate 15 downward as shown by the arrow, and as a result,
The flange portion 15a is separated from the bottom surface of the lower case 1. In this state, the magnetic disk 13 becomes rotatable.

It should be noted that before loading the magnetic disk driver, the shaft 17 is located almost at the center of the case, and the disk hub 12 is engaged with its outer circumference, so it is difficult to center the center of the disk hub 12. is almost perfect, and the reference axis 21
When the disc hub 12 is engaged with the mounting hole 12a of the disc hub 12, its center positioning is performed with high precision, and no loading errors occur.

(Effects of the Invention) In this invention, when the cartridge is not in use, the center of the disk hub is pressed upward and fixed accurately in the center of the case, so if the cartridge is not handled roughly or shaken strongly, There is no backlash such as this, and the positioning accuracy during loading can be improved.

Further, the present invention does not require complicated parts to fix the magnetic disk unlike conventional cartridges, and also eliminates the need for a release mechanism on the magnetic disk driver side.

Therefore, the cartridge and driver mechanisms can be extremely simplified, and since components are not stacked in multiple stages along the thickness direction, both the cartridge and the driver can be made thinner.

[Brief explanation of the drawing]

FIG. 1 is an explanatory sectional view showing a conventional magnetic disk cartridge, FIG. 2 is an explanatory sectional view of a magnetic disk cartridge according to the present invention, and FIG. 3(a). (I?) is a sectional view showing an enlarged main part. 10...Lower case 11...Upper case 12...Disk hub 13...Magnetic disk 16...Sleeve 17...・Shaft 17a... Tapered head 19... Compression coil spring or more Applicant: Seiko Seiki Co., Ltd. Agent Mogami

Claims (1)

[Claims] (1) A magnetic disk rotatably stored in a cartridge case, a disk hub that fixes the center of rotation of the magnetic disk and protrudes from an opening formed in the bottom of the case, and a disk hub that is attached to the disk hub. In a magnetic disk cartridge equipped with a clamp mechanism that removably engages and fixes the disk hub to the cartridge case, the clamp mechanism includes a sleeve that is provided at the center of the upper surface of the case and has an engagement hole that expands at the top. The sleeve is engaged with the sleeve in a tapered manner, and the shaft is inserted into a mounting hole formed through the center of the disc hub. A magnetic disk cartridge characterized by being provided with an elastic material that biases the disk hub against the case bottom opening m+green.