Patent ID: 11893189
Assignee: FLATFROG LABORATORIES AB
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 19:
20. A touch sensing apparatus comprising:
a panel that defines a touch surface extending in a plane having a normal axis,
a plurality of emitters and detectors arranged along a perimeter of the panel,
a light directing portion arranged adjacent the perimeter and comprising a light directing surface,
wherein the emitters are arranged to emit light and the light directing surface is arranged to receive the light and direct the light across the touch surface,
the panel comprises a rear surface, opposite the touch surface,
the emitters and/or the detectors are arranged in a cavity of a frame element and arranged opposite the rear surface to emit and/or receive light through a channel in a wall portion of the cavity, and
the light directing surface receives light from the emitters, or directs light to the detectors, through the panel and through the channel, wherein the frame element is formed from a metal and comprises the light directing portion, and the light directing surface is an anodized metal surface of the frame element.