Browse Prior Art Database

Battery Shielding Label

IP.com Disclosure Number: IPCOM000118643D
Original Publication Date: 1997-Apr-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 64K

Publishing Venue

IBM

Related People

Mito, T: AUTHOR [+2]

Abstract

Disclosed is a battery shielding label for a notebook Personal Computer (PC) that can prevent noise from its system unit.

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

Battery Shielding Label

      Disclosed is a battery shielding label for a notebook Personal
Computer (PC) that can prevent noise from its system unit.

      A battery is connected with the system unit by Direct Current
(DC) connector of several pins of (+), (-), (T: thermistor), (S:
battery select), and (C: communication).  When about 100 MHz to 500
MHz of high  frequency noise is applied to these battery lines inside
the system logic  circuit, noise will be generated and spread out
from the battery body to outside the system unit.  Usually, battery
cover material is non-conductive and ferrite beads on the battery
power lines are not effective to prevent this high frequency noise.
This shield will provide  a solution to solve this problem.

      Figs. 1 through 4 show examples of this battery shield.  The
battery bottom and top surface is covered by a conducted shield label
(1) and has a conductive opening (2) at the bottom and side to
connect with the system unit battery bay (3) by a spring (4).  This
spring is connected to the system flame to keep a firm connection of
the grounding.  This figure is for a bottom connection type.

      Therefore, the system noise through DC lines will be protected
by these conducted shields which cover the battery pack surface.  It
is also effective not only for ElectroMagnetic Interference (EMI)
radiation but Electric Static Discharge (ESD) protection.