JPS63213181A - Disk cartridge - Google Patents

Abstract

PURPOSE:To perform the recording and reproducing without any track deviation by providing an orthogonal bending part on a part of the disk supporting body consisting of a magnetic stainless steel plate, etc., and abutting the disk driving body of a magnetic recording and reproducing device to this orthogonal face. CONSTITUTION:The driving hole 23 engaged with the driving pin 22 of a recording and reproducing device is provided on the metallic disk supporting body 21 supporting a recording disk 27. The annular regulation rib 24 regulating the movement in the diameter direction of a recording disk body and opposing to the insertion opening part of the disk driving body 26 of a cartridge case is provided on the disk supporting body 21 as well. On the regulation rib 24, a pair of the V shaped regulation rib plane parts 24a, 24b for abutting to one side face of the circular outer peripheral part of the disk driving body 26 are formed by subjecting one part of the disk supporting body 21 to orthogonal bending by punching with a press. Since a metal is used for the plane parts 24a, 24b of the regulation rib 24 there are no troubles of wear, dent, etc. even in the case of long time use.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a recording disk body used for example in a magnetic disk cartridge, and in particular, a recording disk body is attached to one side of a circle m portion of a disk drive body of a magnetic recording and reproducing device. This invention relates to a recording disk body in which the center position of the recording disk body is determined by abutting a flat part provided on the inner periphery of a regulating rib protruding from the side surface of the recording disk body.

BACKGROUND OF THE INVENTION FIG. 4 is a sectional view of a main part of a conventional magnetic disk cartridge installed in a recording/reproducing apparatus.

A magnetic disk body 2 is rotatably housed in a cartridge case 1. This magnetic disk body 2 includes a donut-shaped magnetic disk 3, a disk-shaped disk support 4 made of a magnetic plate such as magnetic stainless steel to which the inner circumference of the magnetic disk 3 is adhesively fixed to the outer circumference, and the disk support. The device regulating rib 6, which is composed of a synthetic resin regulating rib 6 protruding from the lower surface of 4 and near the outer periphery by outsert molding, has an annular shape as shown in FIG. A pair of substantially V-shaped flat portions 6b and θb are formed on the surface so as to face each other.

By inserting the tip of the disk drive body 7 into the regulation rib 6 from the disk drive body insertion opening 6 of the cartridge case 1, the permanent magnet 9
Due to the magnetic attraction force of
The magnetic disk body 2 is placed on top to regulate its position in the vertical direction, and the flat portions eh, 6b of the regulating ribs 6 abut against the outer periphery 8b of the receiving portion 8, thereby centering the magnetic disk body 2.

Further, as shown in FIG. 6, a drive bin 1o is embedded in the disk drive body 7, and engages with a drive hole 4b of the disk support body 4 to rotate the disk support body 4.

This centering mechanism is connected to the magnetic disk 3 as shown in FIG.
The torque T generated by the frictional resistance of the head 11 of the magnetic recording and reproducing device is
Receive with a and eb and perform centering.

Problems to be Solved by the Invention However, in this method, if a plastic material that is subject to severe wear or has low mechanical strength is used as the material for the regulating rib, the flat portion 68L will be damaged as it is used.

When a load is applied to 6b, wear or denting occurs, and the initial track position shifts, resulting in poor reproduction.

In particular, the deviation is magnified at the outer periphery of the magnetic disk body 3, and if there is abrasion or denting on the flat surface of several μ, the deviation will be several times larger at the outer periphery. If the density is 2 for recording and reproducing, the reproduction will be defective. Further, as described above, track deviation varies not only due to wear and mechanical strength, but also due to changes in the perpendicularity between the disk support 4 and the flat portions 6a, 61) of the regulating ribs. Therefore, unless a synthetic resin with a coefficient of linear expansion comparable to that of the disk support made of a magnetic stainless steel plate is used for the regulating ribs, the perpendicularity will fluctuate due to temperature changes and track misalignment will occur. As mentioned above, when selecting the material for the regulating ribs, consider factors such as wear, mechanical strength, linear expansion coefficient, and resin that is easy to outsert mold.
There are many constraints, and the synthetic resins that can be used are inevitably limited, making it necessary to use expensive synthetic resins. However, since it is a synthetic resin, it is impossible to completely eliminate wear, dents, coefficient of linear expansion, etc.

In view of the above-mentioned problem, the present invention attempts to solve this problem by using metal for the plane portion of the regulating rib.

Means for Solving the Problem In order to solve this problem, the present invention punches out a part of a disk support made of a magnetic stainless steel plate or the like and provides a right-angled bent portion, and a disk drive of a magnetic recording/reproducing device is formed on this right-angled surface. It is characterized by the fact that it makes contact with the body.

According to the above-mentioned structure, the present invention is able to absorb the torque generated by the frictional resistance between the magnetic disk body and the head through the drive hole provided in the metal disk support and the drive hole formed by bending a part of the disk support. However, since the flat part is made of metal, there is no need to worry about wear or denting even when used for a long time, and it also resists changes in the usage environment due to the difference in linear expansion coefficient. Tilt of the plane part does not occur.

Example An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 21 is a metal disk support that firmly supports the recording disk at the inner circumference of the recording disk 27.
The disk support 21 is provided with a drive hole 23 that engages with a drive bin 22 of a recording/reproducing device. Further, the disk support is provided with an annular regulating rib 24 that protrudes from the side surface of the disk support 21, faces the disk drive body insertion opening of the cartridge case, and regulates the radial movement of the recording disk body. There is. Further, the regulating rib 24 has a pair of V-shaped regulating rib flat portions 24&, 2 that come into contact with one side of the circular outer peripheral portion of the disk drive body 26.
4b presses a part of the disk support 21 as shown in FIG. 2a.
It is provided by punching it out as shown in FIG. 2 and forming a right-angled bent part 26 as shown in FIG.

Torque generated by the frictional resistance between the magnetic disk body and the head is applied to the drive hole provided in the metal disk support and the flat part formed by bending a part of the disk support. (4) Since it is made of metal, wear and dents may occur even after long-term use, and the flat surface may tilt due to differences in linear expansion coefficients due to changes in the usage environment. There is no.

In this embodiment, the bend is made on the outside, but as shown in FIG. 3, pressing may be performed in the opposite direction to the pressing in FIG. 2, and the bend may be placed on the inside. Although the surface that comes into contact with the disk drive body 6 is a flat surface, it may be a gently curved surface.

Effects of the Invention The present invention has the above-described structure, in which the disk drive body and drive bin of the recording/reproducing device, which are made of metal, are connected to the drive hole provided in the disk support of the disk cartridge, which is made of the same metal. And since it comes into contact with a flat part provided by bending a part of the disk support, it is possible to eliminate track deviations due to wear, dents, differences in linear expansion coefficients, etc. In addition, since the disc support alone forms a connection with the disc drive of the recording/reproducing device without relying on the regulation ribs, the role of the regulation ribs is to be used when transporting the disc cartridge. This is only to prevent the magnetic disk body from being excessively biased to one side and causing damage due to the outer circumferential portion of the magnetic disk coming into contact with the inner surface of the cartridge case.9 Cheap resin can be used. Furthermore, the bending provided on the disk support can also be used to increase the bonding force with the regulating ribs.

[Brief explanation of the drawing]

FIGS. 1a and 1b are plan views and cross-sectional views of a disk cartridge according to an embodiment of the present invention, and FIGS. 2a and 2b are plan views showing the expanded punched state of the disk support and the main parts of the right-angled bent portion. 3 is a sectional view of the main part showing the state when right angle bending is performed on the inside, Fig. 4 is a sectional view of the main part of a conventional disk cartridge, and Fig. 5 is an enlarged view of the main part of the regulating rib. 6a and 6b are a plan view, 2 and a side view of a disk drive body provided in a recording/reproducing device, and FIG. 7 is a diagram showing a state in which a magnetic disk body touches a recording/reproducing head and generates torque while rotating. FIG. 21... Disc support, 22... Drive pin, 23... Drive hole, 24...
...Regulation rib, 24a, 24b...Regulation rib flat part, 25...Right angle bending part, 26...
disk drive. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Figure 7 Evening - Ward, 8 2 Ward Cq ν Q) faction and p

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 and a metal disk support that firmly supports the recording disk at an inner peripheral portion of the recording disk. An annular regulating rib is provided that protrudes from the side surface of the recording disk body and the disk support body, faces the disk drive body insertion opening of the cartridge case, and regulates the radial movement of the recording disk body; A pair of approximately V-shaped flat or curved portions are provided on the inner circumferential surface of the recording disk for determining the center position of the recording disk body by coming into contact with one side of the circular outer circumferential portion of the disk drive body when the disk rotates. A disk cartridge characterized in that a portion of a disk support is exposed on a flat or curved surface by bending.