JPH02230581A - magnetic disk cartridge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Field of Application 2B-7 The present invention relates to a magnetic disk car (IJ), specifically a case body formed of an upper case and a lower case, in which a magnetic disk can be rotated. This relates to a stored magnetic disk cartridge.

2. Description of the Related Art Conventionally, this type of magnetic disk cartridge (hereinafter simply referred to as a cartridge) has had a configuration as shown in FIG. 2 and subsequent figures. FIG. 2 is a perspective view showing the appearance of a 3.5-inch microfloppy disk (or 90ffff flexible disk cartridge), and shows the lower case 71.
and the upper case 2 form a cartridge body.

The internal structure of this cartridge is shown in FIG. FIG. 3 is a sectional view showing the vicinity of a thrust bearing portion that slides into contact with the tip of a drive shaft 11 provided in an external disk drive. In FIG. 3, a case body 7 is composed of a lower case 1 and an upper case 2, and a magnetic disk (a thin disc-shaped sheet recording medium) that magnetically records and reproduces information within the internal space of the case body 7. (simply referred to as disk) 3
is accommodated. A center core 4 is fixed to the center of the disk 3, and a hole 1 for inserting a disk drive is provided in the center of the case 71 so that the center core 4 can be rotated by the external drive shaft 11. Also, on the inner surface of the upper case 72, a sheet-like center plate 6 made of polyethylene or the like is formed as a bearing part that slides into contact with the tip of the drive shaft 11.
is attached with double-sided adhesive tape. The upper cane 2 is combined with the lower cane 1 and joined by ultrasonic welding.

Problems to be Solved by the Invention However, in such a conventional configuration, the center plate 5 is made of an expensive material such as ultra-high molecular weight polyethylene, and it is attached using double-sided adhesive tape, which reduces material costs. The problem is that the center plate 6 becomes high and that positional deviation occurs when attaching the center plate 6 to the case 2.

Means for Solving the Problems In order to solve the above-mentioned problems, the magnetic disk cartridge cartridge of the present invention uses solid lubrication instead of the conventional center fly 1- on the thrust bearing portion that makes sliding contact with the drive shaft 11 on the inner surface of the upper case. It is coated with an agent.

Function: With this configuration, the center plate 5 and double-sided adhesive tape are omitted for the null bearing portion on the inner surface of the upper case, and the configuration and assembly process are simplified.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. Note that the same numbers are used for parts corresponding to those in the conventional example, and redundant explanations are omitted.

FIG. 1 is a sectional view around a thrust bearing inside a cart nozzle according to an embodiment of the present invention, and corresponds to FIG. 3 of the conventional example. The difference between FIG. 1 and FIG. 3 is that a solid lubricant 6 containing fluororesin as a main component is applied to the bearing portion of the inner surface of the upper case 2 that makes sliding contact with the drive shaft 11. The lubricant 6 may also be molybdenum disulfide, graphite 1, etc.

Further, as a method for applying the solid lubricant 6, a spraying method or a pad printing method is suitable, but other methods may also be used. When applying the solid lubricant using the method described above, installing a printing machine or a spraying machine on the side of the molding machine that molds the upper case 2 and immediately applying the solid lubricant to the formed upper case 72 will speed up the process. It is convenient because it is simple and the application surface is not cold and clean. The upper case 72 is combined with the upper case 1 and joined by ultrasonic welding as in the conventional case.

Effects of the Invention As described above, according to the present invention, the solid lubricant 6 is applied to the inner surface of the upper case to create a null bearing that makes sliding contact with the drive shaft 11, so that the center plate can be removed without losing the melanut bearing function. Since the 5th grade can be omitted,
This has the advantage of simplifying the assembly equipment, improving its operating rate, and reducing the cost of parts.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing essential parts of a magnetic disk 6-7 cartridge according to an embodiment of the present invention, FIG. 2 is an external perspective view showing an example of a magnetic disk cartridge to which the present invention is applied, and FIG. is a sectional view showing the main part thereof. 1...F case, 2...Upper Keine, 3
...Magnetic disk, 4...Center core, 6. Old solid lubricant, 11. Drive shaft.

Claims (3)

[Claims] (1) A lower case that has a hole for receiving the drive shaft, an upper case that has a thrust bearing portion on its inner surface that makes sliding contact with the drive shaft, and a case body that is housed in the internal space of the case body, which is made up of the lower case and the upper case, and that drives the drive shaft. 1. A magnetic disk cartridge comprising: a magnetic disk rotated by a shaft; the thrust bearing portion is formed by applying a solid lubricant to the injection-molded upper case. (2) Claim 1 wherein the solid lubricant has a fluororesin as its main component.
The magnetic disk cartridge described. (3) The magnetic disk cartridge according to claim 1 or 2, wherein the solid lubricant is applied to the injection-molded upper case by a spraying method or a pad printing method immediately after molding.