JPH02302915A - Magnetic head device for data recording and reproducing device - Google Patents

Abstract

PURPOSE:To unify an exclusive-use servo head with a simple structure by providing a gap for reading servo data to use exclusively for reading the servo data in a track adjoining to a read/write gap or at the other side of a head slider. CONSTITUTION:A gap 13 for reading servo data is formed in the position of a head slider 10a corresponding to the track adjoining to the track of a recording medium corresponding to a read/write gap 11 or in the position of a head slider 10 having a distance corresponding to the prescribed portion of a track. Consequently, the servo data recorded in the deep layer of the recording medium can be successively read. In such a way, with the simple structure, the servo head to use exclusively for reading the servo data can be unified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) Part of the present invention is a data recording and reproducing device having a servo mechanism;
In particular, the present invention relates to a magnetic head device for a floppy disk drive.

(Prior Art) In recent years, floppy disk devices with a large storage capacity have been developed as data recording and reproducing devices.

Some of these devices use a servo mechanism capable of highly accurate control as a head positioning control mechanism because the recording density of the recording medium is high. The servo mechanism reads servo data recorded in advance on a recording medium, and positions the head on a target track on the recording medium based on this servo data.

Here, as a recording method for servo data, for example, an embedded servo method such as a sector servo method in which servo data is recorded on a part of the data surface, or a deep servo recording method in which servo data is recorded in a recording layer deeper than the data surface. There is. In the embedded servo method, servo data is read by a read/write head that reads and writes normal data, so a dedicated servo head is not required. However, since servo data can only be obtained intermittently, continuous head positioning control operation is impossible.

On the other hand, in the deep servo recording method, servo data is recorded on the entire deep layer which conceptually corresponds to the data surface, so it is possible to read out the servo data continuously. However, a dedicated servo head is required to read servo data continuously. A floppy disk drive has an erase head in addition to a magnetic head and read/write head. For this reason, in the conventional magnetic head, it is extremely difficult to simply provide a servo head from a structural standpoint.

(Problem to be Solved by the Invention) In conventional deep servo recording type floppy disk drives, a dedicated servo head (i.e., a gap for reading servo data) is required, or a servo head is simply provided in a conventional magnetic head. This is difficult from the structural standpoint of the head.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head device for a data recording/reproducing device that has a simple structure and is integrally equipped with a dedicated servo head for reading servo data in a deep servo recording system.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a data recording/reproducing device equipped with a servo mechanism of a deep servo recording type, which includes a read/write gap gap and a servo data reading gap. This is a magnetic head device. The servo data reading gap of this device is located at a position of the head slider corresponding to a track adjacent to the track of the recording medium corresponding to the read/write gap, or at a position of the head slider having a distance corresponding to a predetermined track. It is formed.

With such a configuration, it becomes possible to continuously read out servo data recorded deep in the recording medium.

(Example) The present invention will be described in detail below with reference to the drawings. 1 and 2 are plan views showing the configuration of a magnetic head device used in a floppy disk device according to a first embodiment. As shown in FIG. 2, the magnetic head device of the same embodiment includes a head slider lO that contacts the surface of the recording medium and constitutes the main body of the device. The head slider lO has a contact surface with respect to the recording medium that is divided into a -blade side 10a and the other side lOb with a central groove 10c in between. The groove 10c is for preventing an adsorption phenomenon when the recording medium comes into contact with the recording medium.

A read/write gap 11, an erase gap 12, and a servo data reading gap 13 are provided on one blade side LOa of the head slider IO.

Read/write gap 11 and erase gap I2
As shown in FIG. 1, they are provided in parallel to the circumferential direction of the recording medium within a range corresponding to the tracks of the recording medium. The erase gap 12 is a gap of the erase head of the advanced wide erase method, and erases data over a wide range at a position preceding the read/write gap 11 (in the rotational direction A of the recording medium). On the other hand, the servo data reading gap 13 is provided within a range corresponding to a track adjacent to the track corresponding to the read/write gap 11. The servo data reading gap 13 is a dedicated gap for reading servo data recorded deep in the recording medium. Furthermore, in order to prevent crosstalk with the read/write gap 11, the gap 13 is formed to have a predetermined azimuth.

FIG. 3 is a block diagram for explaining the configuration of the servo system according to the same embodiment. As shown in FIG. 3, the floppy disk device is provided with a spindle mechanism 21 that rotates a recording medium 20.
The SO head 2 and the S1 head 23 are configured to seek in the radial direction relative to the radial direction. Each head 22.2
3 are constructed as shown in FIGS. 1 and 2, respectively. Each of the heads 22 and 23 is mounted on a carriage 24, and seeks by moving the carriage 24.

The carriage 24 is moved in the radial direction of the recording medium 20 by a carriage drive circuit 25.

Each head 22. 23 from the read/write circuit 26.

The read signal read from the recording medium 20 is output to the read/write circuit 26.

Servo data reading gap 13 of each head 22, 23
The servo data read out is output to the servo circuit 27 and processed. The servo circuit 27 connects each head 22
．． Based on the servo data read from the head 23, a positioning control signal for positioning each head 22 and 23 on the target track is generated through the carriage drive circuit 25.

Next, the operation of this embodiment will be explained. First, in the floppy disk device, the seek mode is used to position the head 22.23 on the target track of the recording medium 10, and the positioned spatula 22.23 performs data write/write to the target l/rack. It is broadly divided into read/write modes.

In the seek mode, the designated heads 22 and 23 read servo data from the recording medium 20 and output it to the servo circuit 27. Here, the recording medium 20 is provided with a front data surface and a deep servo data surface area corresponding to the data surface in the depth direction. The heads 22 and 23 have a servo data reading gap 13 as shown in FIG.
Servo data is read from the deep servo data surface area.

The servo circuit 27 generates a positioning control signal based on servo data read by the head 22.23, and drives and controls the carriage drive control circuit 25.
The basic operation of 7 is similar to the servo system of a hard disk drive. In the same embodiment, servo data reading gap 1
3 is at a position shifted by one track with respect to the read/write gap 11, positioning control processing is executed assuming this positional shift error. The carriage drive control circuit 25 controls the carriage 2 by drive control of the servo circuit 27.
4 in the direction of the target track. Specifically, the carriage drive control circuit 25 drives and controls a driving source of the carriage 24, such as a stepping motor (or voice coil motor), to move the carriage 24.

By controlling the movement of the carriage 24, each head 22°23
Once positioned at the target track, it shifts to read/write mode. Each head 22, 23 performs data write/write to the target track.

In this way, with respect to the read/write gap 11, the servo data read Ji;! is installed at a position corresponding to an adjacent track. Servo data recorded deep in the recording medium 20 is read out through the gap 13 . Based on this read servo data, each head 22, 23 will be positioned on the target track.

In this embodiment, since the servo data reading gap 13 is provided at a position corresponding to the adjacent track with respect to the read/write gap 11, it is possible to set the center position interval between each gap with high precision. . In addition to the advantage of being able to read out servo data continuously, in addition to the advantage of using the read/write gap 11 in combination with the servo data reading gap, we also set the gap length of the servo data reading gear/tube to the optimum value. Can be set to . Further, by providing an azimuth in the servo data reading gap 13, it is possible to reduce crosstalk with the read/write gap 11.

4 to 6 are plan views of a second embodiment of the present invention.

In the second embodiment, as shown in FIG.
It is provided in ob. A read/write gap 11 and an erase gap 12 are provided on one side 10a of the head slider 10, as shown in FIG.

That is, the servo data reading gap 13 is provided at a distance corresponding to several tracks in the radial direction of the recording medium 20 from the position of the read/write gap 11.

Further, the servo data reading gap 13 has a predetermined azimuth with respect to the read/write gap 11, as shown in FIG. The configuration and operation of the servo system when using the magnetic head of the same embodiment are the same as those of the first embodiment.

With the configuration of the same embodiment, the distance between the servo data reading gap 13 and the read/write gap 11 is larger than that of the first embodiment, so the effect of preventing crosstalk can be enhanced. becomes possible.

[Effects of the Invention] As detailed above, according to the present invention, in the deep servo recording method, a dedicated servo data reading gap for reading servo data is set to a track or head adjacent to the read/write gap. The structure provided on the other side of the slider makes it possible to provide a magnetic head device with a simple structure and an integrated dedicated servo head. With the device of the present invention, it is possible to realize a continuous servo data read operation with almost no influence of crosstalk with the read/write gap.

[Brief explanation of drawings]

1 and 2 are plan views showing the configuration of a magnetic head device according to a first embodiment of the present invention, FIG. 3 is a block diagram showing the configuration of a servo system according to the same embodiment, and FIG. 4 6 to 6 are plan views of the second embodiment of the present invention, respectively. lO...head slider, 11...read/write gap, 12...erase gap, 13...servo data reading gap. Applicant's agent Patent attorney Takeshi Suzue Figure 5 Figure 6

Claims (2)

[Claims] (1) In a data recording/reproducing device equipped with a deep servo recording servo mechanism for positioning the head on a target track, there is a read/write gap formed on the head slider that contacts the surface of the recording medium, and this read/write gap. A magnetic head device for a data recording/reproducing apparatus, comprising: a servo data reading gap formed at a position of the head slider corresponding to a track located near the corresponding track of the recording medium. (2) In a floppy disk device equipped with a deep servo recording servo mechanism for positioning the head on a target track, a read/write gap formed on one side of the head slider that contacts the surface of the recording medium; an erase gap formed on one side of the head slider so as to be parallel to the read/write gap in the circumferential direction of the recording medium; and an erase gap formed on the other side of the head slider so as to be parallel to the read/write gap in the circumferential direction of the recording medium; 1. A magnetic head device for a data recording/reproducing apparatus, comprising: a servo data reading gap provided at a position having a distance corresponding to a predetermined track in the radial direction of the recording medium.