JPH08434U - Floppy disk system - Google Patents

Abstract

(57) [Summary] (Correction) [Problem] To maintain good adhesion between a magnetic disk body and a magnetic head and obtain stable input / output waveforms. SOLUTION: A center hub 4 of a floppy disc 1
The outer peripheral portion a is provided with an annular portion inclined in a conical shape toward the fixed magnetic head.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a floppy disk system using a floppy disk, and more particularly to a floppy disk system using a floppy disk having a center hub.

[0002]

[Prior art]

 Generally, a floppy disk is widely used as a recording medium for a computer because it is easy to handle and low cost.

FIG. 4 shows the structure of this floppy disk. In the figure, reference numeral 1 shows a magnetic disk body in which a magnetic material is applied to an annular flexible polyester sheet or the like. A center hole 2 of the magnetic disk main body 1 is fixed with a metal center hub 4 via an A ring 3 made of a double-sided tape or the like. A pin hole 5 is formed at the center of the center hub 4. Positioning holes 6 are formed in the outer peripheral portion.

Such a floppy disk is held and rotated on the spindle table 7 when data is recorded and reproduced. In this spindle table 7, a spindle pin 8 is arranged in the center, a slip sheet 9 and a magnet 10 are arranged around the spindle pin 8 in order from the inside, and further a drive pin 11 is arranged on the outer peripheral portion thereof.

FIG. 5 shows a holding portion for holding the floppy disk and the spindle table 7. The pin hole 5 and the positioning hole 6 arranged in the center hub 4 are the spindle pin 8 and the drive pin arranged in the spindle table 7, respectively. The center hub 4 made of metal is attracted and held by the magnetic force of the magnet 10.

The support for the rotary shaft receives a rotational force from the spindle pin 8 by the drive pin 11, and the drive pin 11 holds the center hub 4 by the elastic force of the leaf spring 12.

[0007]

[Problems to be solved by the device]

 However, in such a conventional floppy disk system, since the slip sheet 9 of the spindle table 7 and the portion of the center hub 4 that contacts the slip sheet are both flat, the flatness is not good. In this case, the holding of the spindle table 7 and the center hub 4 becomes unstable, and as shown in FIG. 6, when the magnetic head 13 fixed to the magnetic disk body 1 is brought into contact with the recording / reproducing of data, The magnetic disk main body 1 vibrates during rotation and the input / output waveform is distorted, so that the characteristics of the magnetic disk main body 1 cannot be fully utilized. However, the entire contact surface between the spindle table 7 and the center hub 4 is made uniform. There is a problem that it is very difficult to process it flat.

The present invention has been made in response to such a conventional situation, and it is possible to obtain a stable input / output waveform by improving the adhesion between the magnetic disk body and the magnetic head against the occurrence of vibration during rotation. It is intended to provide a floppy disk system that can be used.

[0009]

[Means for Solving the Problems]

 The present invention provides a floppy disk having an annular magnetic disk body, a center hub concentrically fixed to a central hole of the magnetic disk body, and having a center hub having a pin hole inserted into a spindle pin at the center, and the magnetic disk body. In a floppy disk system including a fixed magnetic head that contacts the center of the disk, the center hub is disposed on a first annular portion centered on the pin hole and on an outer peripheral portion of the first annular portion. , A second annular portion fixed to the magnetic disk body via the A ring and conically inclined toward the magnetic head.

According to the floppy disk system of the present invention, the annular portion, which is conically inclined toward the magnetic head provided on the outer peripheral portion of the center hub, prevents vibration of the magnetic disk body during rotation. Adhesion with the magnetic head can be improved and stable input / output waveforms can be obtained.

[0011]

[Embodiment of device]

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

FIG. 1 shows an essential part of an embodiment of a floppy disk of the present invention. In the figure, reference numeral 4a indicates a metal center hub. The center hub 4a has a pin hole 5 arranged at the center thereof and a positioning hole 6 arranged at the outer peripheral portion thereof. In addition, the center hub 4a of this embodiment is recessed in an annular shape around the pin hole 5 and is formed into a conical inclined surface. Further, the outer peripheral portion of the center hub 4a, to which the magnetic disk body 1 in which the magnetic material is applied to the flexible polyester sheet is fixed via the A ring 3 made of a double-sided tape, is conical toward the magnetic head 13 as shown in FIG. It is formed in an annular portion that slopes like a circle.

When the floppy disk configured as described above is inserted into and held by the spindle pin 8 and the drive pin 11 of the spindle table 7 having the pin hole 5 and the positioning hole 6 respectively, the center hub 4a is held by the spindle table. Since it is held by line contact only at the outer peripheral portion of the slip sheet 9 of No. 7 away from the zero rolling axis, the holding stability is improved compared to the conventional floppy disk system, and vibration of the rotating shaft can be suppressed. .

Further, the outer peripheral portion of the center hub 4 a is formed in a conical shape so that the outer peripheral portion of the fixed magnetic disk body 1 is inclined toward the magnetic head 13, and thus is shown in FIG. As described above, the adhesion of the contact portion between the magnetic disk body 1 and the magnetic head 13 is improved.

FIG. 3 is a diagram showing a difference in output waveform between the floppy disk system of this embodiment and a conventional floppy disk system. In this figure, the pattern indicated by reference numeral (a) is a conventional floppy disk system. An example of the output waveform of the magnetic head 13 in the disk system is shown, and the pattern shown by the symbol (b) shows an example of the output waveform of the magnetic head 13 in the floppy disk system of the present embodiment. As can be seen from the figure, in the floppy disk system of this embodiment, the holding stability of the center hub 4a and the spindle table 7 is improved, and the adhesion between the magnetic disk body 1 and the magnetic head 13 is improved. Therefore, the output waveform is more stable than the output waveform of the conventional floppy disk system, and the characteristics of the magnetic disk body 1 can be fully utilized.

As described above, in the floppy disk system of the present embodiment, the stability of holding the center hub 4a and the spindle table 7 is improved, and the magnetic force fixed to the outer peripheral portion of the center hub 4a is improved. Since the disk body 1 is formed with an annular portion which is conically inclined toward the magnetic head fixed via the A ring, a stable input / output waveform can be obtained.

[0017]

[Effect of device]

 As described above, in the floppy disk system of the present invention, the center hub outer peripheral portion is provided with the annular portion which is conically inclined toward the magnetic head side, so that the adhesion between the magnetic disk body and the magnetic head is improved. It is possible to obtain high and stable input / output waveforms.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of a floppy disk system of the present invention.

FIG. 2 is a side view showing the entire floppy disk system shown in FIG.

FIG. 3 is a pattern diagram showing an example of output waveforms of the floppy disk system of the present invention and the conventional floppy disk system.

FIG. 4 is a perspective view showing the configuration of a floppy disk.

FIG. 5 is a vertical cross-sectional view showing a main part of a conventional floppy disk system.

FIG. 6 is a side view showing the entire floppy disk system shown in FIG.

[Explanation of symbols]

 1 ... Magnetic disk main body 2 ... Center hole 3 ... A ring 4, 4a ... Center hub 5 ... Pin hole 7 ... Spindle table 8 ... Spindle pin 13 ... Magnetic head

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuhiko Nishiyama 72 Horikawa-cho, Sachi-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Horikawa-machi factory (72) Inventor Yuki Izumi 72 Horikawa-cho, Kawasaki-shi, Kanagawa Prefecture Toshiba Electronic Engineering Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A floppy disk having an annular magnetic disk body, a center hub concentrically fixed to a central hole of the magnetic disk body, and having a center hub having a pin hole inserted into a spindle pin at the center, and the magnetic disk. In a floppy disk system including a fixed magnetic head that contacts a main body, the center hub is disposed on a first annular portion centered on the pin hole and an outer peripheral portion of the first annular portion. , A second annular portion fixed to the magnetic disk main body via the A ring and conically inclined toward the magnetic head.