JPH06103583B2 - Magnetic recording device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording device such as a floppy disk device or a magnetic disk device used in an external recording device used in a computer or the like.

2. Description of the Related Art Conventionally, in this type of device, a magnetic head is moved to a required track, a position detection signal of a recording medium is read, and a deviation between the magnetic head and the recording track is changed, and a current balance to a step motor is changed to perform microstep driving. I was correcting it.

Problems to be Solved by the Invention However, the above-described conventional magnetic recording device has a problem that the correction value cannot be sufficiently corrected when the correction value is slightly corrected due to friction on the load side.

The present invention solves such a conventional problem, and provides an excellent magnetic recording apparatus having a large recording capacity by enabling accurate correction to a correction value and reducing a deviation between a recording track and a magnetic head. That is the purpose.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a micro-shock input circuit in a step motor drive circuit to change a phase current imbalance and perform a micro-step operation each time a micro-step operation is performed. By applying a small impact input in the same direction as the head moving direction by the method, a required current imbalance is applied to the step motor.

Action The present invention has the following effects due to the above configuration. That is, when a minute impact input is applied, a minute impact force is applied to the carriage connected to the step motor, static friction approaches dynamic friction, and when the current imbalance is set to a required value, only this balance The carriage moves with low friction. Therefore, the carriage can be moved accurately with respect to the current imbalance applied to the step motor, and the head can be corrected to the required track more accurately. Further, since the minute impact input is applied in the same direction as the head moving direction by the micro step operation, the head can be moved more smoothly.

Embodiment FIG. 1 shows the structure of an embodiment of the present invention.
In FIG. 1, 1 is a recording medium, and a spindle motor 2
Is rotated by. A magnetic head 3 is a carriage 4
And is connected to the step motor 5. A microcomputer 6 outputs a control signal and a control amount to the micro impact generator 7 and the micro step generator 8. Reference numeral 9 is a step motor drive circuit.

Next, the operation of the above embodiment will be described. In the above embodiment, the head 3 reads the track position information and outputs it to the microcomputer 6. The microcomputer 6 calculates based on the above position information and outputs the correction amount and the correction direction for the head 6 to the microstep generator 8 and the micro impact generator 7. The micro-impact generator 7 outputs the micro-impact output to the step motor drive circuit 9 only when the current imbalance occurs. The step motor drive circuit 9 outputs the outputs of the micro step generator 8 and the micro impact generator 7 to the step motor 5 to drive the step motor 5. Therefore, according to the above-described embodiment, when the correction amount (current imbalance for microstep) changes, the micro impact generator 7 operates to generate a micro impact force in the same direction as the head moving direction by the my step operation. Step motor 5
It is transmitted to the carriage 4 through the. Then, the carriage 4 receives a slight impact force, the movement of the carriage 4 becomes smooth, the head 3 can be moved accurately with respect to the correction amount, and there is an advantage that the deviation between the track and the head 3 can be minimized. Therefore, there is an effect that the track pitch can be narrowed and the storage capacity can be increased. FIG. 2 shows a correction amount, a micro impact input, a micro step output, and a movement of the carriage according to the present invention.
This indicates that the carriage 4 is moving more accurately.

EFFECTS OF THE INVENTION As is apparent from the above-described embodiment, the present invention provides a stepper motor drive circuit with a micro-shock input circuit, and applies a micro-shock input every time a micro-step operation is performed by changing the phase current imbalance. Since it is configured to give the required current unbalance to the step motor, there is an advantage that the position of the head can be corrected more accurately by adding a simple circuit. Further, since the minute impact input is applied in the same direction as the head moving direction by the micro step operation, the head can be moved more smoothly. Therefore, the track density can be increased and the storage capacity can be increased.

[Brief description of drawings]

FIG. 1 is a block diagram of a portion for performing a microstep operation in one embodiment of the present invention, and FIG. 2 is a timing diagram showing main signals of the device. 1 ... Recording medium, 2 ... Spindle motor, 3 ... Magnetic head, 4 ... Carriage, 5 ... Step motor, 6
...... Microcomputer (microcomputer), 7 ... Micro impact generator, 8 ... Micro step generator, 9 ... Step motor drive circuit.

Claims (1)

[Claims] 1. A magnetic head for recording or reproduction, a carriage for fixing the magnetic head, a step motor for moving the carriage to a required track, and a positional deviation between the head and the required track for the step motor. A magnetic recording device comprising a micro-shock generator that applies a micro-shock input in the same direction as the head movement direction by the micro-step operation.