Browse Prior Art Database

Optical Digitizing Stylus

IP.com Disclosure Number: IPCOM000043889D
Original Publication Date: 1984-Oct-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Murphy, AS: AUTHOR [+2]

Abstract

An alternative to an optical mouse shaped as a stylus for use in association with a digitizing tablet is disclosed. The stylus carries four central optical detector fibers in square formation connected to a detector together with two adjacent optical fibers spaced on either side of the central fiber. The latter two fibers illuminate a tablet with visible and infrared light which is reflected to the central fibers via a lens. Alternatively, the two fibers may be replaced by a transparent tube surrounding the central fibers for illumination purposes. To allow the ends of the optical fibers to contact the tablet, the lens may be dispensed with, but this requires a beam splitter between the optical fibers to connect to a light source and the detector. Fig.

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Optical Digitizing Stylus

An alternative to an optical mouse shaped as a stylus for use in association with a digitizing tablet is disclosed. The stylus carries four central optical detector fibers in square formation connected to a detector together with two adjacent optical fibers spaced on either side of the central fiber. The latter two fibers illuminate a tablet with visible and infrared light which is reflected to the central fibers via a lens. Alternatively, the two fibers may be replaced by a transparent tube surrounding the central fibers for illumination purposes. To allow the ends of the optical fibers to contact the tablet, the lens may be dispensed with, but this requires a beam splitter between the optical fibers to connect to a light source and the detector. Fig. 1 illustrates the stylus having a barrel 1 shaped so that it can only be gripped in one position. The upper end of barrel 1 has a cable 2 connected to a light-emitting diode (LED) light source and photoelectric detectors. The lower end of barrel 1 terminates fiber-optic reading head 3 adjacent to tablet surface 4. Head 3 is surrounded by support 5 which includes, adjacent to tablet surface 4, pads to reduce friction and may also include magnets for parking the stylus at the side of the tablet. Fig. 2 shows details of optical head 3. Barrel 1 is tapered at 7 to a smaller diameter adjacent to tablet surface 4 and protects a central bundle of four detector fibers 8 together with two optical f...