Browse Prior Art Database

Electro Static Discharge Protection for Magneto Resistive Head/Arm Assembly

IP.com Disclosure Number: IPCOM000106722D
Original Publication Date: 1993-Dec-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Greaves, HR: AUTHOR [+4]

Abstract

Disclosed are methods of protecting Magneto Resistive (MR) read/write heads from damage by Electro Static Discharge (ESD) on disk file head/arm assemblies. During attachment to the slider, MR leadwires are kept short circuited to each other maintaining the head pole-pieces at the same potential during the build period. Three methods of shorting out the lead wires are given.

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Electro Static Discharge Protection for Magneto Resistive Head/Arm Assembly

      Disclosed are methods of protecting Magneto Resistive (MR)
read/write heads from damage by Electro Static Discharge (ESD) on
disk file head/arm assemblies.  During attachment to the slider, MR
leadwires are kept short circuited to each other maintaining the head
pole-pieces at the same potential during the build period.  Three
methods of shorting out the lead wires are given.

      Disk file MR heads are particularly susceptible to ESD damage
during assembly operation in the plant.  Means of reducing ESD risk
are described below with reference to an embodiment of a single
head-arm assembly (1) shown in the Figure.  The arm (1) pivots about
a centre bearing (7) with the MR head (3) fitted at the tip of the
arm (1).  Connection wires (2) are routed from (3) to the arm's tail
(8) and anchored at (4) until two or more arms are stacked as a set
in the arm-actuator (not shown).  A pair of temporary handling flags
(9 and 10) are employed while assembling pairs of arms (1) into an
actuator stack.  The upper flag (9) serves to anchor connections from
the top head (3); the lower flag (10), shown hatched, serves the same
anchorage on a bottom arm (not shown) connections.  Cuts (11) in each
arm facilitate the temporary fixture of flags (9 and 10) into
locators on the arms (1).

      After heads (3), arms (1) and flags (9, 10) are brought
together the connection wires (2) can be short...