JPH045109Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a magnetic head mechanism used in a magnetic disk device, and in particular relates to a thin film head mechanism, which has recently been actively developed.

(Prior Art and its Problems) In the magnetic head mechanism for a magnetic disk device, as the device becomes larger in capacity and higher in density, the amount of slider floating has become significantly smaller, and a gap of about 0.3 μm is now in practical use. Furthermore, magnetic heads have been developed from conventional monolithic bulk heads to thin film heads using semiconductor processes, and are beginning to be introduced into actual equipment. Thin film head mechanisms that have been put to practical use so far consist of a slider and a suspension support spring mechanism that supports the slider, and the slider is attached to a magnetic head actuator arm mechanism by screwing, caulking, or other methods. FIG. 2 shows an example of a slider and suspension mechanism currently in practical use. As can be seen from the figure, a suspension gimbal spring section is glued to the back surface of the slider. If this head mechanism is used in a 14-inch, large-capacity magnetic disk device, it will repeat high-speed random seeks with an access time of about 16 ms. At this time, the dynamic stability of the slider, which lubricates the surface of the recording medium with a film of air in submicron gaps, becomes a major problem. If the slider becomes unstable during high-speed seek and an accident (head crash) occurs in which it comes into contact with the surface of the recording medium, the information recorded on the surface of the recording medium will disappear in an instant. When looking at the thin film head mechanism shown in FIG. 2 from this point of view, there are major problems. In other words, since the pivot point that applies the load to the slider is on the back surface of the slider, the position of the slider center of gravity does not match the position of the pivot point. This means that the slider's dynamic movements around the pivot point, such as translation, pitch, and roll movements, are coupled, and the probability of a head crash occurring while causing extremely complex vibrations is low. It will be extremely high.

(Purpose of the present invention) The purpose of the present invention is to eliminate the drawbacks of the conventional thin film head mechanism described above and to provide a thin film head mechanism that is dynamically stable even after repeated high-speed random seek movements. It is in.

(Structure of the invention) According to the invention, in a thin film head mechanism in which one end is bonded to the back surface of a thin film head slider to support the thin film head, and the other end is mounted on a positioning device in a cantilever shape, a plurality of thin film heads are attached on the back surface of the thin film head slider. A thin film head mechanism is obtained in which a pivot point at which a load is applied to a slider by attaching a viscoelastic block to the slider is aligned with the position of the center of gravity of the slider.

(Example) The present invention will be described in detail below using the drawings. FIG. 1 is a diagram showing an embodiment of a thin film head mechanism according to the present invention. In this embodiment, a viscoelastic body is attached to the back surface of a thin film head slider by a method such as gluing. As the viscoelastic body, for example, polyacetal resin such as polyfluoroethylene was used. On the other hand, a conventional thin film head mechanism is shown in FIG. This structure is extremely simple; gimbal spring 2 is attached to the back of slider 1,
On top of this, a load spring 3 is configured to press approximately the center of the slider 1. In this structure, the pivot point at which a predetermined load is applied to the slider is approximately at the center in the slider longitudinal direction and in the slider width direction, but since the slider thickness direction is at the back of the slider, the pivot point is the so-called slider center of gravity. They will not match. That is, needless to say, the actual slider center of gravity exists inside the slider block. This means that when the thin film head mechanism accesses the surface of the recording medium at high speed, there is a high probability of causing random coupled vibrations. It is often the case that external disturbances are applied to the thin film head mechanism. At that time, since the slider is a pivot-supported hydrodynamic air bearing, it reacts dynamically around the pivot axis, but since its center of motion does not coincide with the slider's center of gravity, the motion is coupled and rotational moment etc. As a result, the slider exhibits unstable behavior. As is well known, since there is a minute gap of about 0.3 μm between the slider and the recording medium surface, such dynamic instability is a cause of head crash. Therefore, the head pivot point that applies the desired load to the slider must coincide with the position of the center of gravity of the slider.

The present invention was developed based on such an idea. That is, in a thin film head mechanism in which a gimbal spring is bonded to the back surface of a slider, a viscoelastic body is attached to the back surface of the slider by a method such as gluing. Therefore, the center of gravity in the thickness direction of the slider moves toward the top surface of the slider, and is equivalently positioned on the back surface to which the gimbal spring is bonded. Therefore, the pivot point at which the load is applied to the slider coincides with the position of the center of gravity of the slider, which is significantly different from the conventional mechanism. In this structure, even if a disturbance is applied to the slider when the thin film head seeks over the surface of the recording medium at high speed, the pivot axis is aligned with the center of gravity of the slider, so translational movement, pitch, and rotational movement in the roll direction are prevented. are not coupled, and instability is greatly improved. Furthermore, since the material attached to the back surface of the slider is a viscoelastic material, the slider can have a damping effect, and can even be expected to have the effect of suppressing dynamic fluctuations of the slider due to vibrations on the surface of the recording medium.

From the above, it can be said that the thin film head mechanism of the present invention can be made dynamically extremely stable by simple improvements compared to conventional thin film head mechanisms. It should be noted that any modifications may be made without departing from the idea of the present invention; for example,
The shape of the block attached to the back surface of the slider, the method of attaching the block, etc. may be optimized in each case, and it goes without saying that the above embodiments do not limit the scope of the present invention in any way.

(Effects of the invention) As explained above in detail about the invention, the thin film head mechanism of the invention can equivalently adjust the position of the slider center of gravity by attaching a plurality of viscoelastic blocks to the back surface of the slider using adhesive or other methods. This has the effect of making it possible to match the positions of the pivot point and the pivot point, and as a result, dynamically stable characteristics can be obtained.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the thin film head mechanism of the present invention in which a block is attached to the back surface of a slider, and FIG. 2 shows a conventional thin film head mechanism. In the figure, 1, 1b...slider, 2, 2b
...Gimbal spring, 3, 3b...Load spring, 4...Viscoelastic block.

Claims (1)

[Scope of utility model registration request] In a thin film head mechanism in which one end is bonded to the back of the thin film head slider to support the thin film head, and the other end is mounted on a positioning device in a cantilevered manner, a plurality of viscoelastic blocks are attached to the back of the thin film head slider. A thin film head mechanism characterized in that the pivot point at which the slider is attached and the load is applied to the slider matches the position of the slider's center of gravity.