JPS61253669A - Floppy disk device - Google Patents

Abstract

PURPOSE:To stabilize head touch and to improve reliability by moving a head holder by driving an electromagnetic mechanism by a prescribed signal and making a head pressure to the disk medium of a pair of heads variable. CONSTITUTION:When the logic of an external input signal 13 to an electromagnet driving circuit 12 is varied, for instance, from '0' to '1', a driving output signal 14 is varied, the magnetic pole of an electromagnet 7 is varied, repels a magnet 8 each other and the magnet 8 ascends and abuts on the upper end of a case 22. Accordingly, an oscillating arm 9 is also oscillated in an upper direction by its portion, a coil spring 11 is drawn in the upper direction, a head holder 5 is also oscillated in the upper direction by a portion corresponding to said drawing, a movable head 3 moves upward by some quantity and the head pressure of heads 2, 3 to a medium 1 is reduced by its portion. In this way, even if the revolving speed of a spindle motor or the medium 1 is different, a correct head pressure corresponding to it can be obtained and the correct characteristic of read or write can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floppy disk device, and particularly to a mechanism for varying head pressure.

[Prior Art] Conventionally, in this type of floral disc device, the head pressure of the magnetic head was constant and did not change.

[Problems to be solved] In the conventional Flo7V disk device described above, the head pressure is
Although it is constant, for example, when the rotation speed of the Sugundol motor changes or when using a different type of media, the head touch changes, which can cause the characteristics during reading and writing to deteriorate. There was a point.

[Means for Solving Problems] The present invention solves the above-mentioned problems, and includes a pair of devices disposed on both sides of a disk medium, which read or write the "0" information and "1" information of the disk medium, respectively. a head carriage to which the one head is fixed, a head holder having the other head and movably attached to the head carriage, an electromagnetic mechanism for moving the head holder, and a predetermined signal. The apparatus includes an electromagnet drive circuit that outputs and drives the electromagnet mechanism to move the head holder and vary the head pressure of the pair of heads against the disk medium.

[Example] Next, an example thereof will be described with reference to FIGS. 1 to 3.

1 and 2 are partially cutaway side views of an embodiment of the floppy disk device according to the present invention before and after operation, respectively;
FIG. 3 is a block diagram of the main circuitry of the above device.

In FIG. 1, in the floppy disk device, medium 1 is
It is written with binary information of 0 (zero) and 1. This medium 1 is sandwiched between a fixed rad 2 for reading or writing "0" information and a movable rad 3 for reading or writing rlJ information.

The fixed heald 2 and the electromagnet 7 are fixed to a head carriage 4, and the movable held 3 is fixed to a head holder 5. Further, the head holder 5 has a cylindrical spring holding part 10-1, and is connected to the head carriage 4 by a leaf spring 6, so that it is fixed in the direction perpendicular to the plane of the paper and can swing in the vertical direction. ing.

Further, reference numeral 9 denotes a swinging arm, which is pivotally supported on the head carriage 4 by a pin 21 so as to be swingable in the vertical direction, and has a magnet 8 and a cylindrical spring holding portion 10-2. The electromagnet 7 and the magnet 8 are housed in a cylindrical case 22, and a coil spring 11 is interposed between a pair of spring holding parts 10-1 and 10-2.

Here, in FIG. 1, the swing arm 9 has a magnet 8 and an electromagnet 7.
Because they are attracted to each other, the coil spring 11 is at its lower limit of movement.
is pressed downward.

Therefore, the head holder 5 is swung downward by the coil spring 11, and both heads 2.3 are in contact with the medium 1 at a constant pressure at the lower limit of movement.

Next, the operation will be explained. In FIG. 3, the logic of the external input signal 13 to the electromagnet drive circuit 12 changes from O (zero) to 1, for example. Then, the drive output signal 14 changes, the magnetic pole of the electromagnet 7 changes, and it repels the magnet 8.

Therefore, as shown in FIG. 2, the magnet 8 rises and comes into contact with the upper end of the case 22. As a result, the swing arm 9 also swings upward by that amount, pulling the coil spring 11 upward. Therefore, the head holder 5 also swings upward by a corresponding amount, and the movable head 3 moves upward by a certain amount. Therefore, the medium
The head pressures of both heads 2 and 3 are also reduced accordingly. Therefore, even if the rotational speed of the spindle motor or the medium 1 is different, a corresponding appropriate head pressure can be obtained, and appropriate reading or writing characteristics can be obtained.

[Effects of the Invention] As explained above, the present invention changes the head pressure using an input signal from the outside, so that the medium is always pressed with the optimum head pressure, the head touch is stable, and the writing time is improved. This has the effect of reducing deterioration in reading characteristics and improving reliability.

[Brief explanation of the drawing]

1 and 2 are partially cutaway side views of an embodiment of the floppy disk device according to the present invention before and after operation, respectively;
FIG. 3 is a block diagram of the main circuitry of the above device. l Medium 10-1.10-2 Spring holding part 2 Fixed head 11 Coil spring 3 Movable head 12 Electromagnet drive circuit 4 Head carriage 13 External input signal 5 Head holder 14 Drive output signal 6 Leaf spring 21 Bin 7 Electromagnet 22 Case 8 Magnet 9 Swing arm

Claims (1)

[Claims] It is placed in a position sandwiching the disk medium, and the “
A head holder having a pair of heads for respectively reading or writing ``0'' information and ``1'' information, a head carriage to which the one head is fixed, and the other head, the head holder being movably attached to the head carriage. an electromagnet mechanism that moves the head holder; and an electromagnet that outputs a predetermined signal to drive the electromagnet mechanism to move the head holder and vary the head pressure of the pair of heads against the disk medium. A floppy disk device comprising a drive circuit.