Browse Prior Art Database

Pen Input Device

IP.com Disclosure Number: IPCOM000119890D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 4 page(s) / 143K

Publishing Venue

IBM

Related People

Meissler, MH: AUTHOR [+2]

Abstract

Input mechanisms of the modern window system rely on the mouse for pointing and the keyboard for data input. Proposed is a scheme to perform input using a single pointing and drawing device which is normally linked to the use of flat screens with input sensing on the screen surface.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 44% of the total text.

Pen Input Device

      Input mechanisms of the modern window system rely on the
mouse for pointing and the keyboard for data input. Proposed is a
scheme to perform input using a single pointing and drawing device
which is normally linked to the use of flat screens with input
sensing on the screen surface.

      The scheme permits the facilities of flat panel technologies,
but is primarily for use with normal CRTs. Its potential for
generating hard copy of the computer input is not available with flat
panel displays.  It offers both the fast pointing capabilities and
the accurate rendition of stroke input required for handwritten
input, accurate selection and gesture editing.  It performs better
than the mouse as it offers the same function in a more acceptable
and familiar package.  It also has a second adapter mode, selectable
via the window interface or an application program that is capable of
registering input accurately. Usage of the pen is placed at the end
of this disclosure.
The Pen

      The overall pen configuration is shown in Fig. 1, and the pen
tip cross section in Fig. 2.  The pen 1 is fabricated with five optic
fibers arranged in a cross and held by a spacer.  The center fiber 2
is used for illumination by a high intensity yellow LED 6, and the
four surrounding fibers 3 function as detectors of movement.  The
user "writes" with the pen on a special pad (Fig. 3) which is printed
with a pattern composed of horizontal and vertical lines.  The
horizontal lines are of different color to the vertical lines.  The
space between the lines is printed black and the cross-sections of
the lines contain both colors in equal proportion.  The fibers on the
pen are made selectively sensitive to the two colors of the pad by
color filters 4.  The two fibers on the horizontal beam of the cross
are sensitive to the color of the vertical lines on the pad, and,
vice versa, the two fibers on the vertical beam respond to the color
of the horizontal lines.  A pressure sensor 5 generates a
'pen-on-paper' signal.  The optical fiber sense matrix is fixed
inside the pen such that its orientation with respect to the pen body
is fixed.  The sense matrix senses the reflective pattern on the pad
surface which is illuminated via the central optical fiber 2.
Sensing Pattern and Optical Matrix

      The sensing pattern on the pad surface and the optical fiber
matrix must be designed to register accurately small movements of the
pen.  In addition, it must be possible to determine the direction of
movement and the amount of movement.  The optical sense matrix is a
cruciform-shaped array of five fibers.  The sense matrix enables a
pattern decoder to measure pen movement with respect to the pad
surfaces.  The trajectory across a line is assumed to be linear; that
is, corruption of codes by changes of direction within a sequence are
assumed to be infrequent.  Absolute movement is determined by
observing the output of the optical ma...