JPS6316815B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to a magnetic disk device serving as an external storage device for a computer, and specifically relates to a magnetic head suspension system that eliminates the horizontal vibration of a magnetic head caused by a seek operation of the magnetic head. Regarding the mechanism.

In recent years, the storage capacity of magnetic disk devices has been increasing, and along with the miniaturization of the devices, there has been a demand for increased storage density and reliability. In order to meet these requirements, the slider of the magnetic head must have good ability to follow a magnetic storage medium, such as a flexible magnetic disk, and must always maintain a correct posture when facing the disk. In order to write or read information in such a magnetic disk device, the magnetic head first approaches the surface of the rotating magnetic disk from a perpendicular direction to a writing/reading distance (hereinafter referred to as "magnetic"). This operation is performed by moving the magnetic head in the radial direction of the disk to change tracks on the magnetic disk surface (this operation is hereinafter referred to as the seek operation of the magnetic head). During such an access or seek operation, a mechanical unbalance force is generated in the magnetic head, which may cause an undesirable phenomenon of so-called pitching or rolling of the magnetic head. . Here, pitching means that the magnetic head slider moves in the seek direction (radial direction of the disk at the magnetic head position).
The lateral movement refers to the movement in which the magnetic head slider rotates around the axis in the disk running direction at the magnetic head position.

Generally, a magnetic head suspension mechanism is such that a magnetic head slider is fixed to one end of a leaf spring, and the other end of the leaf spring is extended in the seek direction and connected to a head holder, thereby elastically suspending the magnetic head slider. It's getting old. In such a suspension mechanism, the center of gravity of the magnetic head slider has conventionally been located at a position shifted from within the plane of the leaf spring. FIG. 1 is a schematic side view showing a conventional magnetic head in contact with a magnetic disk 3, and the center of gravity 4 of the magnetic head slider 1 incorporating an electromagnetic transducer (not shown) is It is located at the position indicated by the circle in the circular black and white pattern, that is, at a position closer to the magnetic disk 3 from the leaf spring 2. Note that arrow H in the figure represents the seek direction of the magnetic head, and arrow F represents the rotation direction of the magnetic disk 3. In this way, when the center of gravity 4 of the magnetic head slider 1 is not within the plane of the leaf spring 2, an unbalance moment is generated due to the inertia force accompanying the repeated seek operation of the magnetic head, and the magnetic head slider 1 moves as shown by the arrow S. Produces a rolling motion. In order to explain this state in more detail, FIG. 2 shows the attitude of the magnetic head slider 1 when the magnetic head is sought from a resting position A to a position B. Arrow H' indicates the direction of the inertial force of the magnetic head slider 1. Magnetic head slider 1
swings around its center of gravity.
This lateral movement damages the recording surface of the magnetic disk at the slider corner, and also damages the magnetic head slider itself, which is one of the causes of shortening the durability of magnetic disk devices.

SUMMARY OF THE INVENTION An object of the present invention is to provide a slider suspension mechanism that can prevent the above-mentioned horizontal vibration of the magnetic head and improve the life of the magnetic head slider and magnetic disk even when the magnetic head slider performs high-frequency seek operations. shall be.

The gist of the present invention is to make the sum of the inertial force due to the seek operation of the magnetic head slider and the rolling moment around the center of inertia (equivalent to the center of gravity) due to both the suspension mechanism to be zero. That is, in a magnetic head suspension mechanism in which a magnetic head slider is suspended by a leaf spring, the leaf spring is fixed to the upper surface of the magnetic head slider so that the center of gravity of the magnetic slider lies within the plane of the leaf spring. The present invention is also characterized in that a balance weight is added to the upper side of the magnetic head slider.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a schematic side view showing one embodiment of the suspension mechanism according to the present invention. A balance weight 8 is attached to the magnetic head slider 1 fixed to the tip of the suspension leaf spring 2. This balance weight 8
The total center of gravity of the magnetic head slider 1 and the magnetic head slider 1 (including the electromagnetic transducer incorporated in the slider) is located at a position indicated by reference numeral 4, that is, within the plane of the suspension leaf spring 2. As a result, the direction H' in which the inertial force acts due to the seek operation and the seek direction H (both shown in Figure 3)
(indicated by two arrows) exists in the same plane, and the magnetic head slider is sought without causing any rolling motion. Therefore, it is possible to realize a long life and high durability of the magnetic disk and the magnetic head slider in high-frequency seek operations.

The structure of the suspension mechanism of the magnetic head is such that the front edge and rear edge sides of the magnetic head slider in the magnetic disk running direction are supported by two dynamically equivalent suspension springs, and the entire structure is symmetrical perpendicular to the magnetic disk running direction. By locating the center of gravity of the magnetic head slider within the plane of symmetry and within the plane of the suspension spring, both the vertical vibration associated with the access operation and the horizontal vibration associated with the seek operation can be prevented. This makes it possible to dramatically increase the lifespan of the magnetic disk device.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing a conventional magnetic head facing a magnetic disk, Fig. 2 is a side view showing the attitude of a conventional magnetic head slider during a seek operation, and Fig. 3 is a side view of a conventional magnetic head slider facing a magnetic disk. FIG. 1 is a schematic side view showing one embodiment of the suspension mechanism of the invention. 1... Magnetic head slider, 2... Leaf spring, 3
...Magnetic disk, 4...Center of gravity, 8...Balance weight, H...Seek direction, H'...Direction of inertial force.

Claims (1)

[Claims] 1. In a magnetic head suspension mechanism in which a magnetic head slider is suspended by a leaf spring, the leaf spring is fixed to the upper surface of the magnetic head slider, and a balance weight is attached to the upper side of the magnetic head slider, thereby A suspension mechanism for a magnetic head, characterized in that the center of gravity of the magnetic head slider is located within the plane of the leaf spring.