The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 1999
Filed:
Feb. 13, 1997
Richard Lawrence Garwin, Scarsdale, NY (US);
James Lewis Levine, Yorktown Heights, NY (US);
Michael Alan Schappert, Fishkill, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
This invention provides an optical pointing device, such as those used to control devices such as televisions, VCRs, video games and computers, which have improved accuracy and lower sensitivity to detrimental effects, such as noise and user hand unsteadiness, than prior art devices. Such pointing devices emit light beams, such as infrared light, which when received by a receiver are used to position cursors or other symbolic shapes, such as sliding volume controls. An advantage of the pointing device of the invention is that light emitting diodes of conventional manufacture, known to have poor optical precision and hence variable angular emission profiles, may nevertheless be used in the pointing device of the invention.