Browse Prior Art Database

Human Factors Improvement to Portable Computer Systems Power Control

IP.com Disclosure Number: IPCOM000110824D
Original Publication Date: 1994-Jan-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Osborn, NA: AUTHOR

Abstract

Described is a hardware implementation to improve human factors regarding portable computer systems main power control so as to prevent accidental or unintended powering OFF of the system.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 66% of the total text.

Human Factors Improvement to Portable Computer Systems Power Control

      Described is a hardware implementation to improve human factors
regarding portable computer systems main power control so as to
prevent accidental or unintended powering OFF of the system.

      Typically, small portable computers, particularly hand-held
models with limited size and weight, have power switches located that
can inadvertently power OFF a system.  The concept described herein
provides a modification to the power control state machine operation
by implementing a means of differentiating ON vs OFF activations.

      Many battery-operated computing devices employ a number of
different power-saving techniques, such as an ON/OFF switch that is
used as a "soft" switch.  In this case, the switch does not directly
control the power, but rather is an input to some control circuitry
which evaluates the machine state and initiates the power ON and
power OFF sequences.

      Small, portable computers, especially hand-held machines, are
limited by their nature as to where the power switches can be
located.  Further, weight and manufacturing restrictions limit the
covers and interlocks that can be affixed to switches.  Because the
machine in its normal operation is intended to be handled by the
user, there is a possibility that the user will accidentally activate
the power switch.  Typically, the design of the switch is such that
accidental operation of the switch will not occ...