Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
1999-07-13
2001-05-22
Ometz, David L. (Department: 2754)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
C360S264200, C360S265100
Reexamination Certificate
active
06236531
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to the field of disc drive data storage devices, and more particularly but not by way of limitation, to a flex support snubber for protecting a hard disc drive from damage due to non-operational, mechanical shocks while retaining and guiding a flex circuit assembly.
BACKGROUND OF THE INVENTION
Disc drives are commonly used in workstations, personal computers, portables, and other computer systems to store large amounts of data in a form that can be made readily available to a user. In general, a disc drive comprises one or more magnetic discs that are rotated by a spindle motor at a constant high speed. The surface of each disc is divided into a series of data tracks which are spaced radially from one another across a band having an inner diameter and an outer diameter. The data tracks extend generally circumferentially around the discs and store data in the form of magnetic flux transitions within the radial extent of the tracks on the disc surfaces. Typically, each data track is divided into a number of data sectors that store fixed sized blocks.
A head includes an interactive element such as a magnetic transducer which senses the magnetic transitions on a selected data track to read the data stored on the track, or to transmit an electrical signal that induces magnetic transitions on the selected data track to write data to the track. The head includes a read/write gap that positions the active elements of the head at a position suitable for interaction with the magnetic transitions on the data tracks of a disc as the disc rotates.
As is known in the art, each head is mounted to a rotary actuator arm and is selectively positionable by the actuator arm over a preselected data track of the disc to either read data from or write data to the preselected data track. The head includes a slider assembly having an air bearing surface that causes the head to fly over the data tracks of the disc surface due to fluid air currents caused by rotation of the disc.
Typically, several discs are stacked on top of each other and the surfaces of the stacked discs are accessed by the heads mounted on a complementary stack of actuator arms which comprise an actuator assembly, or “E-block”. The E-block generally includes head wires which conduct electrical signals from the heads to a flex circuit, which in turn conducts the electrical signals to a flex circuit bracket mounted to a disc drive base deck. For a general discussion of E-block assembly techniques, see U.S. Pat. No. 5,404,636 entitled METHOD OF ASSEMBLING A DISK DRIVE ACTUATOR, issued Apr. 11, 1995 to Stefanslky et al., assigned to the assignee of the present invention and incorporated herein by reference.
As will be recognized, a continuing trend in the industry is the reduction in size of modern disc drives. As a result, the discs in the disc stacks of modern disc drives are being brought closer together, providing narrower vertical gaps between adjacent discs. Although facilitating greater amounts of storage capacity, such narrow vertical spacing of the discs gives rise to a problem of increased sensitivity of the disc drives to non-operating, mechanical shocks; particularly, predominant failure modes in modern disc drives have been found to include damage to the surfaces of the discs and damage to the actuator arms as a result of mechanical shocks encountered during the shipping and handling of the drives.
Computer modeling of particular disc drives has revealed that one primary cause of interference between discs and actuator arms is the first mechanical bending mode of the discs, which has been found to cause over 50% of the motion between the arms and discs in selected disc drive designs. The bending mode is generally dependent upon the material, diameter and thickness of the discs, and these factors are not readily modified in a disc drive design.
Thus, there is a need for an improved approach to reducing the susceptibility of damage in disc drives as a result of non-operating, mechanical shocks.
SUMMARY OF THE INVENTION
The present invention provides a flex support snubber for protecting a disc drive from damage due to non-operational mechanical shocks and for guiding and retaining flex strips of a flex circuit assembly.
As exemplified by preferred embodiments, a disc drive has a disc mounted for rotation at a constant speed about a vertical axis. The disc has an inner radius and an outer radius. A rotary actuator is mounted adjacent the disc and is controllably rotatable with respect to the disc. A flex support snubber is mounted on the side of the actuator and adjacent the disc. The flex support snubber has a body portion rigidly affixed to the actuator and includes a plurality of arms extending therefrom and toward the disc. Each pair of arms form a groove to receive the outer radius of the disc.
A plurality of slits are interposed with the grooves to receive flex strips therein. The slits provide for retention of the flex strips from the heads. At an opposite end of the flex support snubber, the flex support snubber curves to form a U-shaped bend. The U-shaped bend guides a dynamic portion of a flex away from the actuator assembly while providing stiffness and support for the flex.
Other objects, advantages, and features of the present invention will be apparent from the following description when read in conjunction with the drawings and appended claims.
REFERENCES:
patent: 3713121 (1973-01-01), Fasano et al.
patent: 4491888 (1985-01-01), Brown et al.
patent: 4843503 (1989-06-01), Hazebrouck et al.
patent: 5121273 (1992-06-01), Slezak
patent: 5140478 (1992-08-01), Yoshida
patent: 5189577 (1993-02-01), Nishida et al.
patent: 5214549 (1993-05-01), Baker et al.
patent: 5231556 (1993-07-01), Blanks
patent: 5235482 (1993-08-01), Schmitz
patent: 5404636 (1995-04-01), Stefansky et al.
patent: 5422770 (1995-06-01), Alt
patent: 5483397 (1996-01-01), Gifford et al.
patent: 5483398 (1996-01-01), Boutaghou
patent: 5644448 (1997-07-01), Suzuki
patent: 5666239 (1997-09-01), Pottebaum
patent: 5801899 (1998-09-01), Genheimer
patent: 6018439 (2000-01-01), Forbord et al.
patent: 6084744 (2000-07-01), Genheimer et al.
patent: 402156490 (1990-06-01), None
Allsup David S.
Aragon Maureen A.
Cox Alvin E.
Duvall Matthew G.
Genheimer Stephen R.
Castro Angel
Crowe & Dunlevy
Ometz David L.
Seagate Technology LLC
LandOfFree
Flex support snubber does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flex support snubber, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flex support snubber will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2439113