JPS6095758A - Floppy disc device - Google Patents

Abstract

PURPOSE:To make the wear of a disk uniform and its service life long by making a contact pressure between a floppy disc and a magnetic head at the disc center larger than the circumferential to miniaturize a motor. CONSTITUTION:A tensile coil spring 22 pushing a pad 5 onto a floppy disc 1 is bridged over between the middle part of a load arm 10 and a constituting member 8 via pins 13, 23. Thus, the vertical component of a force P2 of the spring 22 at the innermost circumference is increased more than the vertical component P at the innermost circumference and the contact pressure is changed stepless from the P1 to the P2. Thus, the wear resistance of the outer circumference of the disc 1 is decreased, the torque load of the disc 1 is uniformed and the drive motor is miniaturized. Furthermore, the wear of disc is uniformed at the inner and outer circumference, no remarkable wear appeares at the outer circumference observed often in a conventional system and the disc service life is extended.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a floppy disk device, and more particularly to a pressurizing arrangement for bringing a spider head into contact with a floppy disk.

(b) Background of the technology Floppy disk devices using flexible recording media have advantages such as large capacity, small size, low cost, easy handling, maintenance-free, and random access. Because of this, it is used in Teder input/output devices, simple file storage devices, and Sondam access loaders, but with the development of word processors and microcontrollers, its production has expanded significantly.

(cl) Prior Art and Problems Figure 1 is a side view showing the conventional configuration of the main parts of a floppy disk device, in which 1 is a floppy disk, 2 is a spindle that rotates at high speed, 3' is a huff, 4 is a magnetic head, and 5 1 is a load pad, 6 is a guide rod, 7.8 is a component supporting the guide rod 6, 9 is a carrier that moves along the guide rod 6, 10 is a load arm with the pad 5 at one end collapsed, 11 is an arm 10 A shaft 12 whose other end is supported by the carrier 9 is connected to the carrier 9 via a pair of pins 13.
And hooked up to the arm 10 is a tension coil spring.

In the apparatus configured in this manner, the disk 1 rotates together with the spindle 2, and the carrier 9 is moved in the radial direction of the disk 1 by a positioning mechanism (not shown). However, the arm 10 can swing around the center of rotation, and the pressure with which the magnetic head 4 contacts the disk 1 is determined by the component force of the coil spring 12 pressing the pad 5 against the disk 1 via the arm 10. It depended on the position of head 4 and remained constant at 4 yen. Therefore,
As the position where the head 4 and pad 5 contact the disk 1 moves away from the center of rotation of the disk 1, the torque load of the frictional resistance where the head 4 and pad 5 contact the disk 1 gradually increases. For this reason, all motors that can rotate the spindle 2 at full speed when the torque load reaches its maximum are used, and miniaturization and reduction of power consumption have reached their limits. At the same time, since the optical surface speed of the rotating child disk 1 increases as it moves away from the center of rotation, the wear of the disk 1 is more pronounced on the outside than on the inside, thereby shortening the life of the disk.

fdl OBJECTS OF THE INVENTION An object of the present invention is to downsize the drive motor for a spindle for rotating a disk, to equalize the wear on the disk, and to reduce the wear on the magnetic head.

tel Structure of the Invention The above object is characterized in that the contact pressure between the floppy disk and the magnetic head moving in the radial direction of the floppy disk is increased by the movement toward the center of rotation of the floppy disk. This is achieved by a floppy disk device.

if) Embodiments of the Invention A floppy disk device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a side view showing the main parts of a floppy disk device according to an embodiment of the present invention, FIG. 3 is a diagram for explaining the force with which the pad shown in FIG. 2 is pressed against the disk, and FIG. The same reference numerals (1 to 11.1
3) Uses k.

In FIG. 2, a tension coil spring 22 for bringing the disk 1 into contact with the magnetic head 4 by pressing the pad 5 against the floppy disk 1 is connected to the intermediate portion of the load arm 10 through the pins 13 and 23. The member 8 and the hook are connected to each other, and its vertical component is the pressing force.

Therefore, as shown in Fig. 3, the height difference (vertical distance) between the bins 13 and 23 is Hk 15 mm, and the horizontal distance between the bins 13 and 23 when the magnetic head 4 is located at the outermost side of the magnetic recording area on the disk surface. The direction interval L1 is 4Q111!
When the vertical force kP+ of the coil spring 22, P+ head 4 is located at the innermost position of the magnetic recording area, bin] 3 and 2.
3, the horizontal distance L2 k is 55 mm, and the coil spring 2
If the vertical force of 2 is 1 self-force kPt, then the coil spring 22 has a free length of 32 mm and a spring constant k of 4 g/+Im, and P is approximately 1511. , Pi is set to approximately 2.6.9.

It should be noted that 15 g of Pl and 269 of P2 are an example in consideration of the fact that in the conventional position, the force for pressing the pad against the disk was 10 to 30 g. Further, although the above embodiment applies the present invention to a single-sided device in which the magnetic head 4 and the pad 5 face each other, the above embodiment also applies to a double-sided device in which a pair of magnetic heads face each other with a floppy disk sandwiched between them. It should be noted that the present invention can be applied in the same manner as described above, and that the present invention can be carried out without being restricted by the structure of the carrier etc. shown in the above-mentioned embodiments or the method of the one-direction fixing mechanism (not shown).

(gl) As described in detail, according to the present invention, the contact pressure between the floppy disk and the ejection head that moves in the radial direction is increased steplessly toward the center of rotation of the disk. By equalizing the torque load on the disc due to contact pressure, it is possible to use a smaller motor for rotating the disc swiddle, which consumes less power than conventional motors, making the device more compact and energy efficient.tL7 ``In addition to C, floppy disks have a longer lifespan due to evened out wear, and are further away from the disk's center of rotation at high speeds +11.
At 11, the contact pressure is lowered by 1 degree than before, so the wear of the magnetic head is reduced and the effect is extremely large.

[Brief explanation of the drawing]

Figure 1 shows the conventional configuration of the floppy disk unit.
2 is a side view showing the essential parts of a floppy disk device according to an embodiment of the present invention, and FIG. 3 is a diagram for explaining the pressing force of the pad shown in FIG. 2. In the figure, 1 is a floppy disk, 4 is a magnetic head, 5 is a load pad, 6 is a guide rod, 7, 8
is a component supporting the kite rod 6, 9 is a carrier,
10 is a load arm, and 12°22 is a tension coil spring.

Claims (2)

[Claims] (1) A floppy disk device characterized in that the contact pressure between a floppy disk and a magnetic head moving in the radial direction of the floppy disk is increased by the movement toward the center of rotation of the floppy disk. (2) The contact member is connected to the intermediate portion of the load arm, which has a load pad fixed to one end that makes the magnetic head fully contact the floppy disk, and the component that is fixed without being affected by the movement. A patented floppy disk device characterized in that the load is applied by the vertical component of the tension coil spring.