IIIH
US006872931B2
(12) United States Patent ao) Patent No.: us 6,872,931 B2
Liess et al. (45) Date of Patent: Mar. 29,2005
(54) OPTICAL INPUT DEVICE FOR MEASURING FINGER MOVEMENT
(75) Inventors: Martin Dieter Liess, Eindhoven (NL);
Christoph Dobrusskin, Eindhoven
(NL); Aldegonda Lucia Weijers,
Eindhoven (NL)
(73) Assignee: Koninklijke Philips Electronics N.V.,
Eindhoven (NL)
( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 298 days.
(21) Appl. No.: 10/169,461
(22) PCT Filed: Nov. 6, 2001
(86) PCT No.: PCT/EP01/12990
§ 371 (c)(1),
(2), (4) Date: Jul. 2, 2002
(87) PCT Pub. No.: WO02/37411 PCT Pub. Date: May 10, 2002
(65) Prior Publication Data
US 2003/0006367 Al Jan. 9, 2003 (30) Foreign Application Priority Data
Nov. 6, 2000 (EP) 00203875
