Barrier transmission apparatus
US5422494A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1994 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Jan 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0421
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a touch input device has a flame and explosion resistant enclosure supporting a display device which is observable from outside the enclosure. The touch screen input device comprises a frame attachable to an axial end of the housing. A transparent window is receivable in the frame for securement to the housing to form an end of the enclosure and defining a view port for viewing the display device. An interface between the window and the frame defines a flame suppressing path extending continuously about the periphery of the interface. A light emitting device is located within the enclosure for directing a beam of light through the window. A first reflector is located on a side of the window opposite the light emitting device for reflecting the beam of light across the view port. A second reflector is located on the same side of the window as the first reflector and spaced from the first reflector to reflect the beam of light from the first reflector through the window and into the enclosure. A light receiving device is located within the enclosure on the same side of the window as the light emitting device. The light receiving device for detecting the presence of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.