Browse Prior Art Database

Contact of Port Replicator and Notebook PC for EMI Noise Reduction

IP.com Disclosure Number: IPCOM000123133D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 3 page(s) / 69K

Publishing Venue

IBM

Related People

Tsumita, M: AUTHOR [+2]

Abstract

Disclosed is a structure which connects a notebook personal computer (PC) to a Port replicator with low impedance, and which reduces EMI (ElectroMagnetic Interference) noise. The structure consists of security-locks (latches; see Fig. 1) of the Port replicator and Latch-acceptors in the PC. The latches connect with the signal ground of the Port replicator. Latch-acceptors connect with the signal ground of the PC, and connect with the latch of the port replicator when locked. When there is no connection between the PC and the port replicator through the latch and the Latch-acceptor, potential difference is generated across them, and the port replicator emits EMI noise. The Latch-acceptor is on the latch in most conventional connection methods as shown in Fig. 3.

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Contact of Port Replicator and Notebook PC for EMI Noise Reduction

   Disclosed is a structure which connects a notebook personal
computer (PC) to a Port replicator with low impedance, and which
reduces EMI (ElectroMagnetic Interference) noise.  The structure
consists of security-locks (latches; see Fig. 1) of the Port
replicator and Latch-acceptors in the PC.  The latches connect with
the signal ground of the Port replicator.  Latch-acceptors connect
with the signal ground of the PC, and connect with the latch of the
port replicator when locked.  When there is no connection between
the PC and the port replicator through the latch and the
Latch-acceptor, potential difference is generated across them, and
the port replicator emits EMI noise.  The Latch-acceptor is on the
latch in most conventional connection methods as shown in Fig. 3.
The latches are turned by arms in the port replicator for the purpose
of Lock/Unlock as shown in Fig. 2.  It is necessary to connects not
only between the latch and the Latch-acceptor but also between gears
of the latch and the arm with low impedance.  However, the tolerance
exists between the gears and the arm for moving the latch as shown in
(1) of Fig. 2.  In the disclosed structure, latch-acceptor is placed
under the latch.  As the latch is slightly turned back by elasticity
of the new Latch-acceptor, the gears securely connect with the arm.

   Fig. 4 shows the example of this structure.  Place the
Latch-acceptor in the PC und...