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Browse Prior Art Database

Metal Core Plate With Elongated Holes

IP.com Disclosure Number: IPCOM000102561D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Endoh, S: AUTHOR [+2]

Abstract

Disclosed is a metal core plate with elongated holes of a printed wiring board.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Metal Core Plate With Elongated Holes

       Disclosed is a metal core plate with elongated holes of a
printed wiring board.

      Figs. 1 and 2 show the metal core plates in prior technology.
In the Fig. 1, the position of the holes is decided in accordance
with a predetermined lead pitch between two lead wires of a component
to be mounted on the printed wiring board.  This structure has a
problem that a component having a different lead pitch from the
predetermined distance is not mounted.  To adapt to the components of
various lead pitches, a matrix of holes is formed in the metal core
plate, as shown in the Fig. 2.

      To realize more adaptability, a matrix of elongated holes is
formed in the metal core plate, as shown in Figs. 3, 4 and 5.  The
elongated hole has the width A which is wider than a diameter D of
the hole shown in the Figs. 1 and 2 and the length B which is
longer than a distance E.  The width A is selected to adapt to
expected thickest lead wires of a large component.  The distance B
between centers of elongated holes is selected to keep the
relationship A<B<C. The arrangement in this article adapts to various
lead pitches 51, 52, 53 and 54.  The lead wires in the elongated hole
could be insulated from the metal core plate by an insulator, as
shown in Fig. 5.