JPS63874A - Floppy disk device - Google Patents

Abstract

PURPOSE:To perform the track correction of a coarse and a fine operations with a simplified constitution and high accuracy by one motor, by detecting positional deviation between a magnetic head, and a recording and reproducing medium, and performing correction by the fine operation of a step motor. CONSTITUTION:After performing a coarse operation, the positional deviation between a floppy disk 1, and a head 7 is detected by a read/write circuit 8, and a position detection circuit 20, and the quantity of off-track, and a direction are calculated, and a microstep circuit 21 drives a step motor 17 through a step motor driving circuit 20. Therefore, so that it is possible to switch two operations, the coarse and the fine operations, at a switching circuit 11, and a control circuit 18 by one motor 17, the track correction can be obtained with the inexpensive constitution and with high accuracy.

Description

[Detailed description of the invention] Regarding the floppy disk device used.

Conventional technology Conventionally, this type of floppy disk device was
8 As described in Publication No. 151.613)2
It was equipped with two step motors, and corrected the track position by making coarse and fine movements. Therefore, it was expensive and its operation was complicated.

Problems to be Solved by the Invention However, in the above-mentioned conventional floppy disk device, two step motors cannot be combined into one because the coarse and fine step motors perform the papermaking operation. There is a problem in that the track correction becomes step-like due to the papermaking operation, making it impossible to perform more accurate correction.

The present invention solves these conventional problems, and aims to provide an inexpensive floppy disk device with a large recording/playback capacity by performing more accurate track correction using a single step motor. That is.

Means for Solving the Problems In order to achieve the above object, the present invention provides a phase switching circuit for performing a papermaking operation, a microstepping circuit for performing a microstepping operation, and a switching circuit for switching between the papermaking operation and the microstepping operation. Both coarse movement (sheet-forming operation) and fine movement (micro-stepping operation) can be performed using one step motor.

Effects The present invention has the following effects due to the above structure. In other words, by switching the switching circuit to coarse movement (step operation) or fine movement (microstep operation), 1
Two step motors can be used for coarse or fine movement.

Example FIG. 1 shows the configuration of an embodiment of the present invention.

1 is a floppy disk for recording or playback,
The drive motor 2 is given the required rotation speed. Reference numeral 6 denotes a magnetic head for recording or reproducing, which is attached to the carriage 7. The carriage 7 is connected to a step motor 17, and a floppy disk 10 is connected to the carriage 7.
The throat 6 can be moved toward the magnetic field in the radial direction. Further, the step motor 17 is driven by a step motor drive circuit 20, which performs both a coarse movement (step operation) and a fine movement (microstep operation) by a switching circuit 11. 18 is a control circuit such as a microconbeater.

Next, the operation of the present invention will be explained. After the coarse movement operation, the control circuit 1 detects the positional deviation (off-track amount) between the recording track of the floppy disk 1 and the magnetic head 7 using the read/write circuit 8 and the position detection circuit 10.
8 is output. The control circuit 18 performs arithmetic processing on the off-track amount and direction and outputs the result to the microstep circuit 21 . The microstep circuit 21 causes the step motor 17 to perform a fine movement operation (microstep operation) via the step motor drive circuit 20 based on the calculation result output from the control circuit 18 .

In this way, even if there is only one step motor 17 according to the above embodiment, the switching circuit 11 and the control circuit 18 can be used for both coarse movement and fine movement.
This has the advantage that by switching between two operations, two operations can be realized with one step motor.

Effects of the Invention As is clear from the above-mentioned embodiments, the present invention realizes a step motor by using a single step motor to perform step motion and micro step motion using a coarse motion and fine motion switching circuit. It has the advantage of being able to

Furthermore, since there is only one step motor, the structure is simple, and a high-capacity floppy disk device can be realized at a low price.

[Brief explanation of drawings]

The drawing is a schematic block diagram of a floppy disk device according to an embodiment of the present invention. 1°゛° floppy disk, 2... Drive motor, 3... Drive motor drive circuit, 4... Drive motor drive signal, 5... Motor rotation/stop signal, 6...
・・Magnetic head, 7・Carnon, 8・・Read/
Write circuit, 9a...Read/write signal, 9b
...Position detection signal,]0...Position detection circuit, 11.
...Phase switching signal, 13...Microstep switching signal,
14... Microstep control signal, 15... Microstep control amount/direction signal, 16... Floppy disk holder, 17... Step motor, 18...
Control circuit, 19... Step signal, 20... Step motor drive circuit, 21... Micro step circuit.

Claims (1)

[Claims] A recording portion for position detection on a medium for recording or reproduction, comprising a magnetic head for recording or reproduction, a carriage for fixing the magnetic head, and a single step motor for moving the carriage to a desired track. A floppy disk characterized in that a track position is corrected using a medium having a magnetic head, and a track misalignment between the magnetic head and the recording/reproducing medium is corrected by operating the step motor in microsteps, thereby increasing the recording/reproducing capacity. Device.