Floating type head slider, floating type head device, and disc d

Details Floating type head slider, floating type head device, and disc d Floating type head slider, floating type head device, and disc d

1996-11-07

1999-06-22

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

G11B 560, G11B 1732

Patent

active

059148330

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to a floating type head slider on which there is mounted a transducer such as a magnetic head, etc. for carrying out recording and/or reproduction of information signals with respect to a disc-shaped recording medium on which information signals are recorded, such as a magnetic disc or magneto-optical disc, etc., a floating type head device using such a head slider, and a disc drive using such a head device.
Hitherto, as the internal memory unit of an information processing device such as a computer, etc., or the external memory unit for a computer, disc drive mechanisms (hereinafter simply referred to as disc drive depending upon circumstances) using, as a recording medium, a hard disc which is the magnetic disc having rigidity, are used.
Such a disc drive comprises, as shown in FIG. 1, a magnetic disc 1 rotationally operated in the direction indicated by arrow R.sub.1 in FIG. 1, at a constant angular velocity by the spindle motor, and a magnetic head unit 2 for scanning the signal area of the magnetic disc 1 extending over the inner and outer circumferences thereof. This magnetic head unit 2 is of a structure as shown in FIG. 2 in which a magnetic head 4 is integrally attached to a head slider 3 moving on the signal recording area of the magnetic disc 1. The magnetic head unit 2 is supported at the front end side of a rotational arm 5 rotationally operated in the direction indicated by arrow X.sub.1 in FIG. 1, with the support shaft being as the center by the voice coil motor. Namely, the magnetic head unit 2 is adapted so that when the voice coil motor is driven so that the rotational arm 5 is rotationally operated, the unit 2 is caused to undergo movement operation in the direction indicated by arrow X.sub.1 in FIG. 1 extending over inner and outer circumferences of the magnetic disc 1 rotationally operated, thus to carry out recording/reproduction of predetermined information signals with respect to recording tracks of the magnetic disc 1.
In this example, the head slider 3 is supported at the front end of the rotational arm 5 through a displaceable elastic (resilient) supporting member in the directions to come into contact with the surface of the magnetic disc 1 and to become away therefrom.
Meanwhile, the head slider 3 on which the magnetic head 4 is provided is adapted as shown in FIG. 2 so that a pair of side rails 6a, 6b forming air bearing are formed between the head slider 3 and the surface of the magnetic disc 1 on the both sides of the lower surface side opposite to the magnetic disc 1 to allow the portion between these side rails 6a, 6b to be a recessed portion 7. These side rails 6a, 6b are formed in a manner substantially in parallel to the tangential direction of recording tracks formed on the magnetic disc 1 when the magnetic head unit 2 is opposed to the magnetic disc 1. At the air inflow end side opposite to the rotational direction of the magnetic disc 1 of the side rails 6a, 6b, taper portions 8a, 8b are formed.
In this example, the magnetic head 4 is provided at the end portion of the air outflow side opposite to the air inflow side of the head slider 3.
The head slider 3 formed in a manner as described above is adapted when it is caused to be close to the surface of the magnetic disc 1 rotationally operated as shown in FIG. 1, it is caused to undergo floating force produced by air flow flowing into the portion between the side rails 6a, 6b and the surface of the magnetic disc 1 in accordance with rotation of the magnetic disc 1 so that it is floated from the surface of the magnetic disc 1. When the head slider 3 is floated from (i.e., above) the surface of the magnetic disc 1, the magnetic head 4 attached on the head slider 3 is also floated from the surface of the magnetic disc 1 as shown in FIG. 3, and is moved on the magnetic disc 1 in the state where a floating quantity d of a very small spacing (distance) is maintained between the magnetic head 4 and the surface of the magnetic disc 1. As stated above, as the result of the f

REFERENCES:
patent: 4475135 (1984-10-01), Warner et al.
patent: 4802042 (1989-01-01), Strom
patent: 5097370 (1992-03-01), Hsia
patent: 5343343 (1994-08-01), Chapin
patent: 5396386 (1995-03-01), Bolasna et al.

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