Browse Prior Art Database

Thin Cursor Control Device

IP.com Disclosure Number: IPCOM000103644D
Original Publication Date: 1993-Jan-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Abrahamsen, R: AUTHOR [+3]

Abstract

By using a flexible top element having a conductive underside, pressure from a fingertip or pencil eraser at appropriate positions on the top of the element causes contacts to be made on an underlying printed circuit to provide indication of direction for desired cursor motion. Included in the device is a central contact for enter or on-off toggle switch operations. The entire device is less than one quarter of an inch (6.35 mm) thick.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 75% of the total text.

Thin Cursor Control Device

       By using a flexible top element having a conductive
underside, pressure from a fingertip or pencil eraser at appropriate
positions on the top of the element causes contacts to be made on an
underlying printed circuit to provide indication of direction for
desired cursor motion.  Included in the device is a central contact
for enter or on-off toggle switch operations.  The entire device is
less than one quarter of an inch (6.35 mm) thick.

      Fig. 1 is a plan view of internal contacts.  Fig. 2 is a
cross-section of the complete device at A-A of Fig. 1, but having
enlarged vertical dimensions.  Printed circuit card 2, having raised
contact 4 and wiring connection 6 serves as a base for the device and
provides contact 4 for enter or toggle operations.  Thin (Flex)
circuit 8 has an open central region, inner ring conductive circuit
10 and a ring of raised cursor directionality contacts (CDCs), e.g.,
12, 14, 16, 18, 20, 22, 24 and 26, each of which is connected
externally to decoding circuitry (not shown).  Top flexible element
28, having a conductive underside, is mounted on support ring 30.
Element 28, shown as a simple membrane, may be a heavier molded
element to resist wear but must have the necessary local flexibility
required to result in contact between ring 10 and only one or two
CDCs after deflection by finger pressure.

      The number of CDCs may be increased to provide increased
angular resolution.  Somewhat m...