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:
Oct. 10, 2017
Filed:
Dec. 17, 2013
Flatfrog Laboratories Ab, Lund, SE;
Hakan Bergstrom, Torna-Hallestad, SE;
Ola Wassvik, Brosarp, SE;
Thomas Craven-Bartle, Sodra Sandby, SE;
Olov Von Hofsten, Arsta, SE;
Bjorn Le Normand, Stockholm, SE;
Leif Ek, Bandhagen, SE;
FLATFROG LABORATORIES AB, Lund, SE;
Abstract
A touch-sensitive aparatus operates by light frustration (FTIR) and comprises a light transmissive panel () with a front surface () and a rear surface (). Light emitters () are optically coupled to the panel () at entry ports along a periphery region of the panel (), and light detectors () are optically coupled to the panel () at exit ports along the periphery region for detecting light transmitted inside the panel (). At least one optical sheet () is provided on the rear surface () in the periphery region. In an outcoupling installation, the light detectors () are arranged at the respective optical sheet () to receive, on a respective light-sensitive surface (A); light from the optical sheet (), and each light detector () is arranged with the light-sensitive surface (A) essentially perpendicular to the rear surface (). In an incoupling installation, each light emitter () is arranged at the respective optical sheet () to emit diverging light with a main direction that is essentially parallel to the rear surface () such that a portion of the diverging light impinges on the optical sheet () so as to define a respective entry port.