JPS6231074A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To extremely reduce a malfunction resulting from a thermal off track during reading and writing information by disposing two magnetic heads carrying out a reading of a positioning signal among plural magnetic heads held by a carriage. CONSTITUTION:When writing and reading of the information are carried out by a read are write head group 91 situated at an inner side of a magnetic disk 8, a positioning operation is performed by a servo head 9a situated at the inner side. When the writing and the reading of the information are carried out by a read and write head group 90 situated at an outer side, the positioning operation is performed by a servo head 9b situated at the outer side. Accordingly, even when the difference of the temperature in a head and disk assembly is large during writing the information and during reading it, the quantity of a thermal off track becomes minimum. Thereby, a malfunction during writing and reading the information is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to the configuration of a track following type magnetic disk device.

[Prior Art] Conventionally, this type of magnetic disk device is
There is something like the one shown in the figure. In Figures 2 and 3, l is an upper board, 2 is a lower board, 3 is a spindle, 5 is a carriage, 6 is a frame, 7 is a magnetic circuit, 8 is a magnetic disk, 8a is a servo disk, 9 is a magnetic Head (read/write head), 9a is a magnetic head (servo head)
Of the magnetic heads 9 attached to the carriage 5, there is only one magnetic head (servo head) 9a for reading positioning signals, and the remaining magnetic heads 9 are all magnetic heads (read heads) for reading and writing data signals. It consisted of 9 light heads.

[Problems to be Solved] In the conventional magnetic disk drive shown in FIG. If there is a difference, the relative positional relationship with the servo Rad 9a changes, causing the so-called thermal off-track phenomenon.
There is a drawback that malfunctions occur when writing and reading information.

Furthermore, in the conventional magnetic disk device having the configuration shown in FIG. A read/write controller 9 located at a different radius distance from the magnetic disk 8 than the servo controller 9a shown in the figure.
Although this is slightly improved compared to the thermal off-track, since the servo RAD 9a and the read/write RAD 9 are located at different radial distances of the magnetic disk 8, thermal off-track still occurs and the information The disadvantage is that it causes malfunctions in writing and reading.

[Means for Solving Problems] The present invention has been made by focusing on the above-mentioned conventional problems, and provides a magnetic disk that can minimize malfunctions caused by thermal off-track when writing and reading information. This is what I am trying to do.

To this end, the present invention includes a substrate, a spindle rotatably attached to the substrate, at least one magnetic disk rotatably mounted on the spindle integrally with the spindle, and the magnetic disk. a plurality of magnetic heads provided correspondingly to write and read data signals or read positioning signals; a carriage that holds the magnetic heads and positions them on predetermined tracks of the magnetic disk; A magnetic disk device comprising a magnetic circuit for driving a positioning operation, characterized in that two magnetic heads for reading positioning signals are provided among the plurality of magnetic heads held by the carriage. The company provides disk devices.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a magnetic disk device that is an embodiment of the present invention.

Referring to FIG. 1, a spindle 3 has a plurality of magnetic disks 8 fixedly mounted thereon in almost parallel, rotatably supported by a lower substrate 2 and an upper substrate l, and driven by a dedicated motor (not shown). is driven by

The carriage 5 includes a magnetic head (read/write head) 9 for writing and reading data signals to and from a magnetic disk 8, and a magnetic head (read/write head) 9 for recording positioning signals (servo signals) and reading servo signals from a servo disk 8a. Two servo drives 9a and 9b are mounted on the servo so that they can linearly reciprocate toward the center of the magnetic disk 8. In order to drive the linear reciprocating motion of the carriage 5, a magnetic circuit 7 constituted by a permanent magnet is provided.
It is attached to the upper substrate 1 and the lower substrate 2 via the coils 1 and 2, and cooperates with a coil (not shown) provided on the carriage 5 to cause the carriage 5 to reciprocate.

The magnetic disk device configured as described above operates as follows. When the magnetic disk 8 is driven by the motor and rotates together with the spindle 3, when a positioning command is received from the host device, the carriage 5 is instructed by a positioning control circuit (not shown) to perform a seek operation, and at the commanded predetermined position. The read/write head 9 records or reproduces information. Therefore, the temperature inside the head skewer disk assembly (hereinafter abbreviated as HDA) during recording and reproduction of information varies depending on the operating environment temperature and the motor. There may be large differences due to differences in the driven time course.

In the embodiment of the present invention, when writing/reading information is performed by the read/write head group 9f located on the inch side of the magnetic disk 8, the servo head group 9a located on the inch side is used.
When the read/write head group 9o located on the outer side performs positioning operation and the read/write head group 9o located on the outer side performs the positioning operation, the servo head 9b located on the outer side performs the positioning operation. Even if there is a large temperature difference inside the HDA between writing and reading, the amount of thermal off-track is minimized, reducing malfunctions when writing and reading information.

[Effects of the Invention] As explained above, the present invention includes a substrate, a spindle rotatably attached to the substrate, and at least one magnetic sheet rotatably mounted on the spindle integrally with the spindle. A disk, a plurality of magnetic heads provided corresponding to the magnetic disk for writing and reading data signals or reading positioning signals, and holding the magnetic head and positioning it on a predetermined track of the magnetic disk. In a magnetic disk device comprising a carriage and a magnetic circuit for driving a positioning operation of the carriage, two magnetic heads are provided for reading positioning signals among the plurality of magnetic heads held by the carriage. Since the magnetic disk device is characterized by this, it has the effect of minimizing malfunctions caused by thermal off-track when writing and reading information.

[Brief explanation of drawings]

FIG. 1 is a front view of a magnetic disk device according to an embodiment, and FIGS. 2 and 3 are front views of a conventional magnetic disk device. 1; Upper board 2: Lower board 3 Nispindle 5: Carriage 7: Magnetic circuit 8: Magnetic disk 8a: Servo disk 9: Magnetic head (read/write head) 9a, 9b: Servo head

Claims (1)

[Claims] a substrate, a spindle rotatably attached to the substrate, at least one magnetic disk mounted on the spindle so as to be rotatable integrally with the spindle, and a data signal provided corresponding to the magnetic disk. a plurality of magnetic heads for writing and reading or reading positioning signals; a carriage for holding the magnetic heads and positioning them on predetermined tracks on the magnetic disk; and a magnetic circuit for driving the positioning operation of the carriage. A magnetic disk device comprising: a magnetic disk device comprising: two magnetic heads for reading positioning signals among the plurality of magnetic heads held by the carriage;