JPS63213182A - Disk cartridge - Google Patents

Abstract

PURPOSE:To eliminate a mistake in chucking by forming in about same dimension the gap between the outer periphery at the tip part of a spindle shaft and the inner periphery of an annular wall and the gap between the outer periphery at the tip of the spindle shaft and the plane part of the annular wall with the gap between the lower case center hole and the annular wall outer periphery being in uniform state. CONSTITUTION:A pair of plane parts 12a, 12b in V shape are formed on the inner peripheral face of the annular wall 12 engaged with a spindle shaft tip 18 and centering is effected with this face abutting to the outer periphery of the spindle shaft. The gap between the outer periphery of the tip part 18 of the spindle shaft and the plane part of the annular wall and the gap between the outer periphery of the spindle shaft tip part 18 and the inner periphery 12d of the annular wall 12 can be uniformized by moving in the apex direction of the V-shaped plane part to the extent of about 1/4 of the difference in the outer diameter of the spindle shaft tip part 18 and the inner diameter of the circle in cribing to the plane parts 12a, 12b of the annular wall 12 the center of the inner periphery 12d for the center of the outer periphery 12D of the annular wall 12, and the chucking mistake of the spindle shaft tip part 18 mounting on the annular wall 12 can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disk cartridge such as a magnetic disk cartridge, and more particularly to a disk car (IJ) equipped with a disk positioning mechanism.

BACKGROUND OF THE INVENTION FIG. 3 is an exploded perspective view of a conventional disk cartridge.

An upper case 1 and a lower case 2, which are molded from synthetic resin, house a magnetic disk 3 in a rotatable manner and a write protector 4 in a slidable manner, and are fixed to each other. Further, a shutter 5 is fitted so as to sandwich the fixed upper case 1 and lower case 2, and the shutter 5 is always pressed in one direction by a spring 6 so as to close the head window doors of the upper and lower cases.

FIG. 4 shows a state in which a conventional disk cartridge is installed in a drive.

As shown in this figure, the drive reference shaft 9 on the drive side is inserted into the drive fitting hole 8 provided in the lower case 2, the position of the cartridge relative to the drive is determined, and the spindle shaft 1o of the drive is inserted into the lower case 2. An annular wall 1 fitted with a center hole 11 with a moderate gap.
Further, a drive pin 13 provided on the spindle shaft 10 engages with a drive hole 15 of a disk support 14 to which the magnetic disk 3 is fixed.

A permanent magnet 16 is housed in the spindle shaft 10 and attracts a disk support 14 made of a magnetic plate. Further, as shown in FIG. 6, a pair of V-shaped flat parts 12&, 12b are formed on the inner circumferential surface of the annular wall 12 that engages with the spindle shaft 10, and this surface Centering is achieved by contacting the outer periphery of 10.

Furthermore, while the cartridge is installed in the drive, the shutter 6 shown in FIG. 3 operates to automatically open the head window 7 by a mechanism on the drive side, and then as shown in FIG. The double-sided magnetic recording head 1a on the drive side comes into contact with the magnetic disk 3 on which the magnetic disk 3 is formed.

Problems to be Solved by the Invention However, when a conventional disc cartridge having such a structure is inserted into a drive (drive means a recording/reproducing device), recording/reproducing failures may occur due to chucking errors. In some cases, if this incorrectly inserted product was taken out of the drive again and then inserted again, normal chucking was performed. However, this phenomenon has become a problem because it must not occur in magnetic recording disk cartridges which require high reliability.

Therefore, we conducted an analysis to find out the cause, and the following results were obtained. This will be explained based on the diagram.

FIG. 6 shows the disk cartridge just about to be inserted into the drive.

The engagement hole 8 of the cartridge is about halfway inserted into the drive reference shaft 9 of the drive, and then the tip 18 of the spindle shaft 1o of the drive is about to be inserted into the annular wall 12 of the cartridge. If the cartridge is vertically lowered in this state, the insertion is completed normally.

However, when analyzing the chucking error, as shown in FIG. 7, the annular wall 12 is offset to one side of the center hole 11 of the lower case 2. It was found that the chucking error was caused by riding on parts 122L and 12b.

A more detailed analysis revealed the following.

(1) When the cartridge is inserted into the drive and the drive fitting hole 8 and the drive reference shaft 9 are aligned, the drive and cartridge should be aligned so that the center of the cartridge center hole 11 and the center of the drive spindle shaft 10 are aligned. Designed.

12) The center of the outer circumference and the center of the inner circumference of the annular wall 12 of the cartridge coincide.

(3) A circle that is in contact with the flat part of the annular wall 12 having the same center as the center of the outer periphery of the annular wall 12 of the car 1-IJ edge,
The outer periphery of the spindle shaft tip 18 has approximately the same diameter.

According to the above three conditions, when the cartridge is properly installed, the center hole 11 of the cartridge
and the center of the annular wall 12 overlap, and the annular wall flat part 12 &
, 12b and a part of the outer periphery of the spindle shaft tip 18 are in contact with each other. However, in order to make the magnetic disk body 19 freely rotatable or to make it easier to assemble the magnetic disk body 19 into the lower case 2, the annular wall outer diameter 0 dimension is made smaller than the ■ dimension of the center hole 11. .

If we look at specific numbers, ■ is 16 feet long, ■ is 14 meters wide, and there is a gap of 0.6 feet on each side. In other words, a state in which there is a uniform gap of 0.61 between the center hole 11 and the outer diameter of the annular wall 12 with a part of the outer circumference of the spindle shaft tip 18 and the annular wall flat parts 12&, 12b in contact with each other. Since it is designed as a reference state, if the annular wall is offset in the placement direction, there is a gap between the outer periphery of the spindle shaft tip 18 and the inner periphery of the annular wall 12, so a chucking error will not occur. However, if the annular wall 12 is offset in the placement direction, the spindle shaft 1
8 rides on the annular wall 12, resulting in a chucking error.

In order to prevent this, one of the flat parts of the annular wall should be
There is a method of making many radii or chamfers on the corner parts of 21L and 12b and the corner part of the spindle shaft tip 18, but if there are many radii and chamfers, the annular wall flat part 12J12
If the length of contact between b and the outer periphery of the spindle shaft tip 18 is short, there is a risk that problems will occur in the transmission of rotational force.

Therefore, the present invention aims to completely eliminate chucking errors without increasing the amount of radius and chamfering.

Means for Solving the Problems To achieve this object, the present invention provides that when the annular wall is positioned so that the gap between the outer circumference of the annular wall and the inner diameter of the center hole of the lower case is uniform, the outer circumference of the spindle shaft The gap between the inner periphery of the annular wall and the gap between the outer periphery of the spindle shaft and the flat portion provided on the inner periphery of the annular wall have substantially the same dimensions.

Effect The present invention has the above-described configuration, so that the center of the inner circumference of the annular body is approximately A of the difference between the outer diameter of the spindle shaft tip and the inner diameter of a circle inscribed in the flat surface of the annular body. V
By moving toward the apex of the flat part of the letter, the outer periphery of the spindle shaft tip and the annular body can be adjusted so that the gap between the center hole of the lower case and the outer diameter of the annular body is even. The gap between the flat parts and the gap between the outer periphery of the spindle shaft tip and the inner periphery of the annular body can be made uniform, and chucking errors in which the spindle shaft tip rides up on the annular body can be eliminated.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is an enlarged plan view and a sectional view showing the magnetic disk cartridge according to this embodiment when it is inserted into a drive in a standard state, and FIG. 2 is an enlarged plan view and a sectional view of the magnetic disk cartridge according to this embodiment. FIG. 7 is an enlarged plan view showing a state in which the annular wall is positioned at a fixed position as the spindle shaft of the drive rotates.

The difference between the disk cartridge of this embodiment and the conventional disk cartridge is the shape of the annular wall 12 provided on the side surface of the disk support 14. That is,
The center line of the outer periphery 18 of the spindle shaft tip, and the center line of the outer periphery 12D of the annular wall 12.

x- which is the center line of the inner circumference of the center hole 11 of the lower case 2
With respect to The plane part of the V-shaped annular wall is adjusted so that the gap between the outer periphery 18 of the gear knob and spindle shaft tip of the plane part 12&, 12b and the inner periphery 12a of the annular wall 12, to be more specific, the minimum gap is almost the same. It is moved in the direction of the vertices of 122L and 12b. As a result, the gap between the lower case center hole 11 and the outer circumference 12D of the annular wall 12 is uniform, and the gap between the outer circumference 18 of the spindle shaft tip and the inner circumference 12d of the annular wall 12, and the gap between the outer circumference 18 of the spindle shaft tip and the annular wall The gaps between the planar parts 12&, 12b are almost the same.

Therefore, the movement view of the annular wall 12 in all directions within the case center hole 11 can be calculated from the outer periphery of the spindle shaft tip.
8, the inner circumference 12d of the annular wall 12, and the flat portion 12&, 12
This is canceled out by the gear b, and furthermore, R19 provided at the tip of the spindle shaft serves as a guide, making it possible to eliminate chucking errors in which the spindle shaft 18 rides on the annular wall 12.

After chucking, as shown in FIG.
' can match, and there is no problem under normal rotation conditions.

Although this embodiment has been described with respect to a magnetic disk cartridge, the present invention is not limited thereto, and can also be applied to, for example, an optical disk cartridge. Further, in this embodiment, the side wall formed on the disk support body is an annular wall and has a cylindrical shape, but it may be in the form of interrupted protrusions.

In addition, the lower case center hole 11 and the outer periphery 12 of the annular wall 12
In order to create a gap between the outer periphery 18 of the spindle shaft tip and the flat parts 121L and 12b of the annular wall while maintaining a uniform gap D, the inner periphery 12d and the outer periphery 12D of the annular wall 12 are
Although the center of the circular wall is shifted, the flat portions 12a and 12b of the circulating wall may be moved away from the outer periphery 18 of the tip of the spindle shaft.

Effects of the Invention As described above, the present invention has a large dimensional margin when a cartridge is inserted into a drive, and can completely eliminate chucking errors that have occurred in the past.

[Brief explanation of the drawing]

1A and 1B are an enlarged plan view and a sectional view of a magnetic disk cartridge according to an embodiment of the present invention when it is inserted into a drive in a standard state, and FIG. 2 is a magnetic disk of a magnetic disk cartridge according to this embodiment. 3 is an exploded perspective view of a conventional disk cartridge, and FIGS. 4A and 4B are main parts showing a state in which a conventional disk cartridge is installed in a drive. 6 is a sectional view, an enlarged sectional view of main parts, and a plan view showing a state in which a magnetic disk body of a conventional disk cartridge is positioned by a spindle shaft of a drive;
Fig. 6 is a cross-sectional view showing a conventional disk cartridge about to be inserted into a drive, Fig. 7 is a plan view showing a conventional disk cartridge in a state of chucking error, and Fig. 8 is a conventional disk cartridge. Figure 9 is an enlarged plan view when the cartridge is inserted into the drive in its standard state. As a countermeasure against the conventional cartridge chucking error, a large radius has been applied to the spindle shaft tip and the flat part of the inner periphery of the annular wall. FIG. 2... Lower case, 3d... Magnetic media inner diameter, 11... Center hole, 12... Annular wall, 12a. 12b...Annular wall flat part, 12d...Annular wall inner angle, 12D annular wall outer periphery, 14...Disc support, 18...Spindle shaft tip. Name of agent: Patent attorney Toshio Nakao and 1 other person! @
2 Figure q;

Claims (1)

[Claims] The recording disk body includes a cartridge case and a recording disk body rotatably housed in the cartridge case, and the recording disk body includes a recording disk, a disk support that firmly supports the recording disk at an inner peripheral portion of the recording disk, and a disk support body that firmly supports the recording disk at an inner peripheral portion of the recording disk. an annular wall protruding from the side surface of the disk support body and opposing the center hole of the lower case of the cartridge case to restrict radial movement of the recording disk body; a pair of substantially V-shaped flat or curved portions for determining the center position of the recording disk body by coming into contact with one side of the outer periphery of the tip of the spindle shaft of the recording/reproducing device when the disk rotates; The annular wall is positioned so that the gap between the outer periphery of the annular wall and the inner diameter of the center hole of the lower case is uniform when the disk cartridge fitting hole is inserted into the drive reference shaft of the recording/reproducing device. When the wall is positioned, the gap between the outer periphery of the tip of the spindle shaft and the inner periphery of the annular wall and the gap between the outer periphery of the tip of the spindle shaft and the flat part provided on the inner periphery of the annular wall are approximately A disk cartridge characterized by having the same dimensions.