Browse Prior Art Database

Head Suspension Assembly Anti-Noise Feature

IP.com Disclosure Number: IPCOM000102573D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Brooks Jr, WW: AUTHOR

Abstract

Disclosed consists of a controlled burr 1 on the suspension which guarantees electrical continuity from the suspension, through the slider/suspension adhesive bond 2, and to the slider. This burr is on the flexure load tongue 3 as shown in the figure. The burr is generated by shearing off the front of the flexure load tongue with a special shear die. The clearance in the die is adjusted to control the height of the burr such that the burr will always penetrate the adhesive layer to make contact with the slider. The burr is also kept from becoming so high that it would adversely affect the strength of the adhesive bond. Any adverse effect the burr might have on the slider static attitude is minimized by limiting the maximum burr height, and by keeping the burr on the front of the flexure load tongue.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 84% of the total text.

Head Suspension Assembly Anti-Noise Feature

       Disclosed consists of a controlled burr 1 on the
suspension which guarantees electrical continuity from the
suspension, through the slider/suspension adhesive bond 2, and to the
slider.  This burr is on the flexure load tongue 3 as shown in the
figure.  The burr is generated by shearing off the front of the
flexure load tongue with a special shear die. The clearance in the
die is adjusted to control the height of the burr such that the burr
will always penetrate the adhesive layer to make contact with the
slider.  The burr is also kept from becoming so high that it would
adversely affect the strength of the adhesive bond.  Any adverse
effect the burr might have on the slider static attitude is minimized
by limiting the maximum burr height, and by keeping the burr on the
front of the flexure load tongue.  However, if more contact area were
needed for lower resistance of the joint, the burr could be extended
around the entire load tongue perimeter.

      Close packing of drive motors, voice coil motor and other
electronic components causes the ambient electrical noise level in
files to be quite high.  Meanwhile, the very high areal density of
the files means that the levels of desired signals are quite low.
The combination of these two factors makes reliable data transmission
very difficult.

      Conductive slider bodies which are ungrounded can allow a
capacitive coupling path between noise signals on t...