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:
Aug. 13, 2002
Filed:
Dec. 19, 1997
Nokia Mobile Phones Limited, Espoo, FI;
Abstract
It is possible to create a two channel data transfer system using an infrared link according to the invention. It is possible by utilizing it to transfer data between two terminal devices ( ) simultaneously to both directions (full duplex), or to establish a two-channel data transfer connection between two terminal devices ( ). An infrared link according to the invention is realized using linearly polarized infrared light (LV, LH). In it a data transfer channel formed using an infrared connection is divided into two separate channels using e.g. polarizers (V , V , H , H ) or beam splitters (BS , BS ). In this case, when data is transferred between two terminal devices ( ), the data transfer to one direction is realized e.g. using vertically polarized infrared light (LV), and correspondingly to the other direction using horizontally polarized infrared light (LH).