Dynamic magnetic information storage or retrieval – Head mounting – For shifting head between tracks
Reexamination Certificate
1999-04-19
2001-08-21
Ometz, David L. (Department: 2652)
Dynamic magnetic information storage or retrieval
Head mounting
For shifting head between tracks
C360S245900
Reexamination Certificate
active
06278585
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to transducer suspension systems and more particularly to suspension systems having integral electric leads.
2. Description of Prior Art
Direct access storage devices (DASD), or disk drives, store information on concentric tracks of a rotatable magnetic recording disk. A magnetic head or transducer element is moved from track to track to record and read the desired information. Typically, the magnetic head is positioned on an air bearing slider which flies above the surface of the disk as the disk rotates. In some proposed disk drives, the slider (or carrier) rides on a liquid film or bearing on the disk. A suspension assembly connects the slider to a rotary or linear actuator. The suspension provides support for the slider.
The suspension must meet several requirements. The suspension must be flexible and provide a bias force in the vertical direction. This is necessary to provide a compensating force to the lifting force of the air bearing in order to keep the slider at the correct height above the disk. Also, vertical flexibility is needed to allow the slider to be loaded and unloaded away from the disk. Another requirement of the suspension is that it must provide a pivotal connection for the slider. Irregularities in operation may result in misalignment of the slider. The slider is able to compensate for these problems by pitching and/or rolling slightly to maintain the proper orientation necessary for the air bearing. Another requirement of the suspension is that it must be rigid in the lateral direction. This is needed to prevent the head from moving from side to side, which will result in the head reading the wrong track.
Disk drives have become smaller in size, and the recording track density has increased dramatically. This has necessitated the use of smaller and smaller heads and suspensions. The smaller size makes it more difficult to string individual wires along the suspension to the head. Recently, electrical leads (or lines) have been integrally formed directly into the suspension, by etching or deposition in order to do away with the need to string separate wires.
It is sometimes difficult to efficiently connect these electrical lines to the electrical connections at the rear of the suspension. Often, the electrical lines are spread out in a vertical plane at the rear of the suspension for attachment to a connection card mounted to the side of the actuator arm. As the vertical space between the disks get smaller and smaller, there is less vertical space available for the electrical lead termination.
SUMMARY OF THE INVENTION
Briefly, in a preferred embodiment of the present invention, a suspension system comprises an actuator arm and two suspensions. Each suspension is attached to an opposite surface of the arm. Each suspension comprises a rigid load beam and a laminated member. The laminated member is comprised of three layers: a supporting steel layer, an electrically insulating layer, and an electrically conducting layer. The laminated member is etched such that the electrical leads are formed in the conducting layer.
The electrical leads run from a transducer head, located at the distal end of each suspension, back to a connection card located on the side of the actuator arm. As the electrical leads leave the rear of the suspension, they are bent down such that they run along the side surface of the actuator arm. The electrical leads from the top and bottom suspensions overlap one another as they run along the side of the arm, thereby reducing the necessary vertical height. The first suspension has a laminated member having all three layers present in the overlap section. The laminated member of the second suspension has the lower support layer removed in the overlap section such that its insulating layer provides insulation between both sets of electrical leads.
For a fuller understanding of the nature and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
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Olson Stephen Arnold
Palmer Darrell Dean
Vesci Anthony
International Business Machines - Corporation
Millett Douglas R.
Ometz David L.
Watko Julie Anne
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