Browse Prior Art Database

Buffing Mechanism for Ceramic Substrates

IP.com Disclosure Number: IPCOM000118065D
Original Publication Date: 1996-Sep-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Bassi, L: AUTHOR [+2]

Abstract

When packaging ceramic substrates, it is increasingly important to exclude contaminating particles. The mechanism used for buffing such substrates must satisfy the conflicting requirements that a conductive path be provided to disperse electrostatic charges, while at the same time any brush material used should be supple enough to avoid scratching the circuitry on the substrate. It must also provide means for flushing particles away from the buffed module.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 78% of the total text.

Buffing Mechanism for Ceramic Substrates

      When packaging ceramic substrates, it is increasingly important
to exclude contaminating particles.  The mechanism used for buffing
such substrates must satisfy the conflicting requirements that a
conductive path be provided to disperse electrostatic charges, while
at the same time any brush material used should be supple enough to
avoid scratching the circuitry on the substrate.  It must also
provide means for flushing particles away from the buffed module.

      The described mechanism with reference to the Figure
effectively meets these requirements.

      Referring to the Figure, the mechanism comprises a shaft 1
which is keyed into a flange 2 which carries a composite brush 3.
The shaft 1 is made of heat-treated martensitic stainless steel and
is mounted in a grounded dry-lubricated, sintered bronze bearing to
be driven by an electric motor (not shown) to rotate the brush 3
against the ceramic substrate to provide the buffering action.

      The shaft 1 is hollow to conduct a cleaning fluid such as
demineralized water or ethanol to the brush to flush particles away
from the module.

      The flange 2 is of aluminium alloy and is drilled to receive
individual brushes forming together the composite brush 3.  The
individual brushes include both natural brushes and brass wire
brushes, the latter having been treated by etching with a 1:1
solution of nitric  acid in demineralized water and subsequentl...