JPS61168178A - Carriage of magnetic disk device - Google Patents

Abstract

PURPOSE:To eliminate the relative shift between a servo head and a data head due to temperature variation completely by forming an arm, a draw bolt, and a housing symmetrically about the center line of a rotating shaft. CONSTITUTION:The carriage 10 of a magnetic disk device consists of the arm 2 having a magnetic head 6 supported atop, the draw bolt 4 for supporting this arm 2 on the housing 5, and rotating shaft 1 and a coil 3. The magnetic head 6 has the data head and servo head and the arm 2 has a data arm and a servo arm corresponding to them. The carriage 10 has the arm 2 and housing 5 made symmetric about a specific reference surface 7 which contains the center axis of the rotating shaft 1 and is parallel to the center axis 1 and the center axis of the draw bolt 4 is on the reference surface 7. Almost no thermal deformation is caused in the rotating direction of the carriage 10 because of the symmetry of shaped even if the arm 2 varies in temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carriage for a rotary type magnetic disk device.

[Conventional technology]

Generally, in this type of magnetic disk drive, a magnetic head is mounted on a carriage, and the air pressure generated as the magnetic disk rotates at high speed causes the magnetic head to float through a minute gap to read and write magnetic records. . The carriage of this magnetic disk device uses a servo head to read a positioning pattern written on a magnetic disk, and sets a servo loop to determine the positioning pattern.

In addition, progress is being made in the direction of improving the recording density of magnetic disk devices, and methods for improving this recording density include increasing the bit density of the trunk and increasing the trunk density by reducing the trunk width. There is. Recently, this trunk width has been reduced to about 20 μm.

By the way, as shown in FIG. 2, the carriage of a conventional magnetic disk device has an arm for supporting a magnetic head 6 at its tip, a draw bolt 4 for supporting this arm on a housing 5, and a draw bolt 4 provided on the housing 5. rotated axis■
and a coil 3. Further, the magnetic hendroid has a data head and a servo head, and
Correspondingly, arm 2 also had a data arm and a servo arm.

On the other hand, with the spread of computers, the range of environmental temperatures in which computers are installed has widened, and as a result, there may be a large difference in the environmental temperature between when writing and reading data. In such a case, the data head is relatively displaced from the trunk positioned by the servo head due to thermal expansion of various parts of the device, which is one of the major causes of off-track.

[Problems to be solved]

In the conventional magnetic disk drive carriage as described above, when off-track occurs due to a temperature difference, there is a problem that information written before the temperature change becomes unreadable due to the temperature change.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a carriage for a magnetic disk drive in which relative misalignment between a servo head and a data head due to temperature changes is improved.

[Means for solving problems]

In the structure of the carriage of the magnetic disk device according to the present invention for achieving the above object of the present invention, a magnetic head is supported by an arm, this arm is supported by a housing via a draw bolt, and a rotating shaft is attached to the housing. In the carriage of the magnetic disk device provided with the magnetic disk drive, the arm, the draw bolt, and the housing are each configured symmetrically with respect to the center line of the rotating shaft.

〔Example〕

Next, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a sectional view showing an embodiment of a carriage of a magnetic disk device according to the present invention.

The carriage 10 of the magnetic disk device according to this embodiment is as follows:
An arm 2 that supports a magnetic head 6 at its tip, a draw bolt 4 for supporting this arm 2 on a housing 5,
It is composed of a rotating shaft 1 and a coil 3. Further, the magnetic head 6 has a data head and a servo head, and correspondingly, the arm 2 also has a data arm and a length-bore arm.

Further, the carriage 10 is arranged with respect to a certain reference plane 7 that passes through the central axis of the rotating shaft 1 and is parallel to the central axis l.
The arm 2 and the housing 5 have a symmetrical shape, and the center axis of the draw bolt 4 is on the reference plane 7. Due to the symmetry of this shape, arm 2 can
Most of the thermal deformation occurred in the direction of 100 rotations of the carriage. That is, misalignment between the data arm and the servo arm of arm 2 due to thermal deformation hardly occurs.

〔Effect of the invention〕

As explained above, according to the carriage of the magnetic disk device according to the present invention, the arm, the draw bolt, and the housing are each configured symmetrically with respect to the center line of the rotating shaft, so that the following effects are achieved.

■ Eliminate relative misalignment between the servo head and data head due to temperature changes.

■ When supported on the housing by the arm and draw bolt, the static height of the magnetic head mounting part on the same arm is almost the same due to the symmetry of the shape, so the relative height between the magnetic disk and the magnetic head is The flying characteristics of the magnetic head are stabilized by controlling the size of the magnetic head.

■ When vibration is taken into consideration, due to its shape symmetry, in-plane displacement and out-of-plane displacement can be easily separated, and a stable servo loop can be constructed because no extra vibration component is generated in the direction of rotation of the carriage.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a carriage of a magnetic disk device according to the present invention. FIG. 2 is a sectional view showing a carriage of a conventional magnetic disk device.

Claims (1)

[Claims] In a carriage of a magnetic disk drive in which a magnetic head is supported by an arm, this arm is supported by a housing via a draw bolt, and a rotating shaft is provided in the housing, each of the arm, the draw bolt, and the housing is connected to the rotating shaft. A carriage for a magnetic disk device, characterized in that the carriage is configured symmetrically with respect to the center line of the shaft.