JPS5982666A - Loading mechanism of magnetic head - Google Patents

Abstract

PURPOSE:To reduce tracking shift due to the temperature change inside a magnetic disc device by composing a head arm, its holding part and a fixing part of the materials having the same coefficient of linear expansion or almost the same ones. CONSTITUTION:The holding part 5, the head arm 8 and the fixing part 10 are inserted so that the projection part 801 of the head arm 8 is engaged with the groove part 506 of the holding part 5. Subsequently, the fixing part 10 is inserted into a hole part 507, and after engaging a pawl part 12 with the engaging surface 803 of a hole part 802, the pawl part 12 is screwed with a nat 13 to fix the head arm 8 on the holding part 5. If the holding part 5, the head arm 8 and the fixing part 10 are composed of the materials having the same coefficient of linear expansion or almost the same ones, clamping torque to the head arm 8 is uniformly changed in accordance with the temperature change inside the magnetic disc device, so that the mutual position of plural magnetic heads 9 can be always kept at the set-up status and the tracking shift due to the temperature change can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic head loading/mechanism in a magnetic disk storage device.

[Technical background of the invention and its problems]

2. Description of the Related Art As the field of use of magnetic disk storage devices using magnetic recording media expands as external storage devices for electronic computers, the density of recording tracks on the magnetic disk surface is increasing.

On the other hand, the loading mechanism of the magnetic spatula (R), which positions the magnetic spatula (R) at a predetermined track position on the magnetic disk for recording and reproducing information, is also becoming more efficient as the track density of the magnetic disk increases. .

In such a situation, each component that makes up the loading mechanism may be damaged due to temperature changes within the magnetic disk drive.
The occurrence of subtle deformations is a problem that cannot be ignored.

For example, in the loading mechanism of a rotary magnetic spatula P in which a head arm with a magnetic head at the tip is fixed to a screw holding part with equal pressure, and the holding part is externally controlled to rotate, the head arm is Aluminum or the like was used for the holding part to reduce weight, and stainless steel or the like was used for the screws and the like for strength.

For this reason, the tightening torque of screws, etc. varies slightly due to temperature changes within the magnetic disk drive, and this change b in the tightening torque causes subtle deformation of the head arm. In particular, in a loading mechanism consisting of multiple helad arms, it is virtually impossible to maintain a temperature difference of 0 between the head arms, and each head arm is attached to the holding part with a different tightening torque. Since the head arms are in a fixed state, the amount of deformation of each head arm is different, and a relative positional shift occurs between the magnetic heads attached to the tips of the head arms, which causes tracking shift and the like.

[Purpose of the invention]

The present invention was made in view of the above-mentioned circumstances, and
It is an object of the present invention to provide a magnetic head loading mechanism that reduces dragging deviation due to temperature changes within a magnetic disk device.

[Summary of the invention]

The present invention provides a head arm having a magnetic spatula r at its tip;
The above object is achieved by constructing the holding part that holds the head arm and the fixing part that fixes the head arm to the holding part from materials having the same or almost the same coefficient of linear expansion.

[Structure of the invention]

Hereinafter, specific embodiments of the present invention will be described in detail with reference to FIGS. 1, 2, and 3. Note that the same reference numerals in the figures indicate the same configurations.

1 is a perspective view of a loading mechanism for a magnetic head using the present invention, FIG. 2 is a partially cutaway plan view of FIG. 1 taken from the direction of arrow X, and FIG. Y-Y in Figure 2
' is an enlarged cross-sectional view. In these figures, the dashed line AFi
It is a magnetic disk. Reference numeral 1 denotes a support shaft having a U-shaped cross section.

The support shaft 1r/'i flat board 101 and the board 10
1, and a flat plate part 103 that stands from one end of the pillar part 102.

The spindle 1 has a hole (not shown) drilled halfway through the base plate part 101 and a hole (not shown) penetrated through the flat plate part 103 to form a shaft (described later in 6). By supporting both ends of the holding portion via bearings 2 provided in the respective holes, a holding portion (described later as 5) is held in a freely rotatable manner. 3Fi, a cap, and the cap 3 is attached to the flat plate part 1.
By fixing it to the flat plate part so as to cover the hole part of 03,
A spring or the like (not shown) provided inside the cap 3 presses the bearing 2, making it possible to eliminate vertical play in the holding portion (described later).

The magnet has a cross section shaped like a Y, and is firmly fixed to one side surface of the flat plate section 103 and the upper surface of the substrate section 101.

As mentioned above, reference numeral 5 denotes a holding part that is rotatably held by the spindle l, and a shaft 6 serving as a center of rotation is inserted and fixed into the holding part 5. In order to reduce the weight of the holding part 5, aluminum is used as the material, and the structure is made as light as possible. That is, the holding part 5 is a pentagonal prism-shaped base 5 with one long side that holds the shaft 6 as the center of rotation.
01, and a coil receiving part 502.5 for attaching a coil (described later) so as to protrude in three directions from the surface of the base 5010811.
03, and a positioning section 504 for positioning the % arm (described later). The mounting surface 505, which is the widest side surface of the base 501, has a helad arm (8
) are carved in four parallel grooves 506 for positioning the ends of the base 501, and -C holes 507 are drilled in four magnolia rows passing through the base 501 from the mounting surface 505.

The tip of the positioning part 504 is a beak-shaped protrusion 508
are formed in parallel, and the protrusion 508 is (
By pressing the upper surface of the head arm (8) 17) with the lower surface of the groove 506, the lower surface of the head arm (8) serves as a height reference for the head arm (8).

7 is a coil fixedly fixed to the coil receiving portions 502 and 503. The holding portion 5 is rotated by the coil 7 and the aforementioned magnet 4.

Reference numeral 8 denotes a head arm consisting of an acute triangular flat plate with a magnetic head 9 protruding from its tip, and four head arms 8 are installed in parallel on the above-mentioned holding part 5.

Like the holding part 5, the head arm 8 is made of aluminum to reduce its weight, and its structure is hollowed out in several triangular and square shapes to the extent that strength is not compromised. A triangular protrusion 801 that engages with the groove 506 of the holding portion 5 is provided on both sides of one end surface of the head arm 8, and a square hole 802 is bored near the end surface τJ. has been done. Note that the hole portion 802 is connected to a fixing portion (described later in 10).
) Since the engaging surface 803 that engages with the claw portion (12 described later) is cut diagonally, it is possible to divide the attractive force on the head arm 8 by the claw portion (12 described later) into the horizontal and vertical directions. I consider it a thing.

Reference numeral 10 denotes a fixing portion made of aluminum or the like having the same coefficient of linear expansion as the above-mentioned j1 holding portion 5 and head arm 8.

The 11 fixed part 10 has a round rod shape, and has a threaded part 11 at one end.
is formed, and the other end is carved into a trapezoidal shape, thereby forming a pawl portion 12 with one side sloped. 13 is a nut that is engaged with the threaded portion 11.

The holding part 5, the head arm 8, and the fixing part 10 configured as described above are inserted into the groove part 506 of the holding part 5 so as to engage the protruding part 801 of the head arm 8, and then the fixing part 10
The head arm 8 is fixed to the holding part 5 by inserting the head arm into the hole 507 and tightening the nut 13 with the claw part 12 engaged with the retaining surface 803 of the hole 802. By tightening the nut 13, the pawl portion 12 moves in the direction of the arrow 2 in FIG. 3 and pulls the head arm 8 in the direction of the arrow 2. Since they each form a slope, a part of the attractive force in the Y direction becomes an upward pushing force on the helad arm 8. However, due to the attractive force in the Z direction, the end surface of the head arm 8 is pressed against the groove 506, and the groove 506 and the protrusion 801 engage with each other, thereby fixing the position of the head arm 8 in the horizontal direction. Due to the pressing force, the upper surface of the groove 506 and the lower surface of the projection 508 press against the upper surface of the head arm 8, and the position of the head arm 8 in the vertical direction is fixed.

〔Effect of the invention〕

As mentioned above, the loading mechanism in this embodiment is precisely constructed so that the magnetic head 9 is accurately positioned on a predetermined track of the magnetic disk A, and the fixing portion 10 tightens each head arm 8. The difference in torque has a subtle effect on the mutual position of the magnetic spatulas r9, but as in the present invention, the materials of the holding part 5, head arm 8, and fixing part 10 are made of materials with equal linear expansion coefficients or Since they are made of almost the same material, the tightening torque for the head arm 8 changes uniformly in response to changes in humidity within the magnetic disk drive, so the position between the magnetic spatulas r9 is always set. This has the great effect of keeping track deviation due to temperature changes to a low 1 tH.

Also, by making the measuring device part 0 lighter like the holding part 5 and head arm 8, the swinging part of the loading mechanism can be made even lighter, and the inertial mass can also be reduced. This also leads to a reduction in access time.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the loading structure of the magnetic spatula r using the present invention, Fig. 2 is a partially cutaway plan view of Fig. 1 viewed from the direction of arrow Y-Y in Figure 2
It is an explanatory view showing an attached state of the head arm in an enlarged cross-sectional view. 5...Holding part 8...Hem r7-m9...Magnetic spatula)" 10...Fixed part agent Patent attorney Noriyuki Chika (f"k or one person) 41

Claims (1)

[Claims] It consists of a head arm having a magnetic spatula IS at its tip, a holding part that holds and rotates the head arm, and a fixing part that fixes the spatula arm to the holding part. A magnetic head loading/mechanism characterized by being made of materials with equal or nearly equal coefficients of linear expansion.