Flatfrog Laboratories Ab

Airport Technology in Scandinavia Ab

Dentronic Ab

Leif Ek

Hans Ahlen

Håkan Bergström

Ola Wassvik

Thomas Craven-Bartle

Olov Von Hofsten

Bjorn Le Normand

Gustav Wolrath

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.

Optical coupling in touch-sensing systems

A procedure and an arrangement for determining a three dimensional shape of a dental object includes the steps of providing a laser, a matrix of photo-detectors, and a controller; scanning a first narrow laser beam from the laser across a first surface area of the dental object; reflecting the first narrow laser beam away from the object; receiving a first scanning image of the reflected first narrow laser beam on the matrix of photo-detectors; determining first elevation profile data based upon the first scanning image relating to the first surface area; changing a relative angle between the laser, matrix of photo-detectors or dental object; scanning a second narrow laser beam from the laser across a second surface area of the dental object; reflecting the second narrow laser beam away from the object; receiving a second scanning image of the reflected second narrow laser beam on the matrix of photo-detectors; determining second elevation profile data based upon the second scanning image relating to the second surface area; and consolidating the first elevation profile data and the second elevation profile data to determine a three dimensional shape of the dental object.

Method and arrangement for making artificial teeth

Embedded light fitting for runways

Growing community of inventors

Bandhagen, Sweden

Leif Ek