JPH0453063A - Disk driving device - Google Patents

Abstract

PURPOSE:To easily execute sector servo by generating an index pulse or a sector pulse based on a signal for rotation control to be used for controlling the rotating speed of a motor. CONSTITUTION:The control signal is outputted from a motor control circuit 6 so that the rotating speed of a motor 1 can be reference rotating speed set in advance, and according to this control signal, the motor 1 is controlled. A pulse generating circuit 7 outputs the sector pulse by dividing the frequency of an FG pulse to be outputted, and this generated pulse is inputted to a read / write control circuit 8. Based on a sector signal corresponding to the read of an ID mark, an index signal is outputted from the circuit 7 and this pulse is inputted to the control circuit 8. Thus, the sector pulse and the index pulse are inputted from the circuit 7 to control circuit 8 and based on these signals, the control circuit 8 controls the drive of a magnetic head 3 for recording and reproducing operations.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disk drive device that drives a magnetic disk such as a floppy disk or a hard disk, and in particular, the present invention relates to a disk drive device that drives a magnetic disk such as a floppy disk or a hard disk. The present invention relates to a disk drive device.

[Conventional technology]

A data zone of an information recording medium such as a floppy disk or a hard disk is composed of, for example, many concentric tracks and many sectors divided in the radial direction.

Sector pulses are used to write and read this information.

Conventionally, to obtain sector pulses, an index sensor was built into the motor that drives the magnetic disk, the index sensor detected an index signal, and a counter generated sector pulses at equal intervals based on this index signal. Ta.

Alternatively, a method has been adopted in which the position of servo data written on the magnetic disk is detected and sector pulses are generated based on this detected position.

[Problem to be solved by the invention]

As described above, in order to obtain an index signal, a motor with a built-in index sensor requires an index sensor, which increases the cost and requires space for its installation.

In addition, in a device that detects the servo data position written on the magnetic disk and generates a sector signal based on the detected position, a dedicated detection circuit is required to detect servo data position 1, and A servo writer is required to write servo data. This made the configuration of the device complicated, resulting in poor productivity.

An object of the present invention is to provide a disk drive device that can easily perform sector servo without providing a special sensor or dedicated detection circuit.

c! Means for Solving Iu] To achieve the above object, the present invention provides a disk-shaped information recording medium having a data area in which a recording track on which data is recorded, and a disk-shaped information recording medium that is rotatably driven. A disk drive device comprising: a motor for controlling the rotation of the motor; a head device for writing or reading information on the information recording medium; and a transport means for transporting the head device. , a pulse generating circuit that generates sector pulses or index pulses.

[Effect]

In the present invention, since index pulses and sector pulses can be generated based on the rotation control signal used to control the rotational speed of the motor, sector servo can be easily performed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram showing the overall configuration of the embodiment, and FIG. 2 is a signal waveform diagram showing the operation of the embodiment.

As shown in FIG. 1, a magnetic disk 2 is mounted on a rotating shaft 1a of a motor 1, and the rotation of the motor 1 drives the magnetic disk 2 to rotate. Record information on the magnetic disk 2 by directly facing the magnetic disk 2.
A magnetic head 3 for reproduction is provided.

A rotation control signal (FG) for detecting the rotation speed of the motor 1
) A detection circuit 5 is connected to the motor 1, and an output terminal of this FG detection circuit 5 is connected to a motor control circuit 6 and a pulse generation circuit 7. The output terminal of this motor control circuit 6 is connected to the motor 1, and the output terminal of the pulse generation circuit 7 is connected to a read/write control circuit 8, which controls the reproduction/recording drive of the magnetic head 3. is configured to take place.

Next, the operation of the embodiment having such a configuration will be explained.

FG is output from the motor 1, and this FC is input to the FG detection circuit 5, and from the FC detection circuit 5, (1) in FIG.
An FG pulse as shown in FIG.

The motor control circuit 6 to which the FC pulse is input monitors the rotation speed of the motor 1 based on this FG pulse signal, and controls the motor control circuit so that the rotation speed of the motor 1 reaches a preset reference rotation speed. A control signal is output from the motor 6, and the motor 1 is controlled by this control signal, so that the motor 1 is always driven at a constant rotational speed.

Further, the pulse generating circuit 7 divides the frequency of the input FG pulse into 1/2, for example, and the pulse generating circuit 7 divides the frequency of the input FG pulse into 1/2.
The sector pulse shown in (2) in the figure is output and input to the read/write control circuit 8. In this case, it is necessary to initialize the counter so that the sector pulse occurs at the beginning of the sector. As a method for this, for example, (1) an ID mark is written in a part of the servo data immediately after the power is turned on, and a counter is reset when the ID mark is read normally.

Alternatively, (2) write an ID mark in the information data and reset the counter when the ID mark is read normally, or (3) write the servo data with a 1/2 track shift for on-track control. Therefore, it is also possible to detect the fluctuation in the output voltage due to this and reset the counter. (1), (3) above
This method utilizes the fact that servo data is written immediately after a sector pulse. Note that when generating an index pulse, it is possible to use the methods (1) and (2) above, and if a sector pulse is not required and only the index pulse is required (when there is only one servo in the - cycle),
This is possible using methods (1), (2), and (3) above.

Further, based on the sector signal corresponding to the above-mentioned ID mark reading, the pulse generation circuit 7 outputs an index signal as shown in (4) in FIG. is input.

In this way, the sector pulse and the index pulse are inputted from the pulse generation circuit 7 to the read/write control circuit 8, and the read/write control circuit 8 drives and controls the magnetic head 3 based on these signals. Playback/recording operations are performed.

According to such an embodiment, there is no need to separately provide an index sensor as in the conventional example, and there is no need for a dedicated detection circuit or servo writer for detecting the servo data position.
The structure is made with holes for parts, which improves productivity and also makes it possible to downsize the entire device.

Further, since sector servo is easily performed and on-track control is performed in synchronization with FC, the speed of the motor can be easily controlled by the motor control circuit.

In addition, in the above embodiment, each rotation of the magnetic disk has 4
Although a case has been described in which one sector pulse is created by dividing the FG pulse by 172, the present invention is not limited to this, and even if the frequency is divided by other than 1/2, or the FG pulse interval If the sector pulse interval matches the FC pulse, the FC pulse may be used as the sector pulse as it is without frequency division.

〔Effect of the invention〕

As described above, the present invention eliminates the need for an index sensor or a dedicated position detection circuit, and can perform sector servo with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the overall configuration of one embodiment of the present invention, and FIG. 2 is a signal waveform diagram showing the operation of one embodiment of the present invention. 1...Motor, 2...Magnetic disk, 3...Magnetic head, 5...
......FG detection circuit, 6...Motor control circuit, 7...Pulse generation circuit,
8...Read/write control circuit.

Claims (1)

[Claims] A disk-shaped information recording medium having a data area in which a recording track on which data is recorded, a motor that rotationally drives the information recording medium, and a head device that writes or reads information to or from the information recording medium. and a transfer means for transferring the head device, the disk drive having a pulse generation circuit that generates a sector pulse or an index pulse based on a rotation control signal of the motor. Device.