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Position sensing systems for use in touch screens and prismatic film used therein

ActiveUS20120056807A1Maximizes parallax effectDimensionMirrorsOptical filtersPrismDihedral angle
A dual light-source position detecting system for use in touch screens is provided that utilizes parallax to determine the position of an interposing object, and a prismatic film that is brightly retroreflective over a broad entrance angle to enhance to accuracy of the parallax determination of position. The position detecting system includes at least one camera positioned to receive light radiation traversing a detection area and that generates a signal representative of an image; two spaced-apart sources of light radiation, which may be LEDs, or IR emitters positioned adjacent to the camera for outputting light radiation that overlaps over at least a portion of a detection area, and a prismatic film positioned along a periphery of at least a portion of the detection area that retroreflects the light radiation from the two sources to the camera. The prismatic film includes a plurality of triangular cube corner retroreflective elements having dihedral angle errors e1, e2, and e3 such that e1≈e2≈0 and e3≈0 to enhance the efficiency of the retroreflection of the light radiation from the two spaced apart LEDS or IR emitters along the sides of the detection area. If two cameras are mounted in opposing corners of a same side of the touch screen and two dual radiation sources are used in combination with these cameras, an unambiguous determination can be made of the location of two simultaneously interposing objects.
Owner:AVERY DENNISON CORP +1

Structure lamp pipe insert connector

An improved structure lamp pipe insert connector comprised of a locking connector component situated between upper and lower lamp pipes, the locking connector component comprised of a threaded rod, a lock sleeve fastened onto the threaded rod, and constraining rings respectively sleeved (not fastened) onto the two ends of the threaded rod and, furthermore, situated at the two sides of the lock sleeve. The interior of the constraining ring is a sloped surface and a plurality of detent slots are disposed along its inner circumferential extent and, after a spring is prepositioned on the sloped surface, it is then sleeved onto the threaded rod. Furthermore, there are revolving guide ring elements with beveled sides, each revolving guide ring element having guide blocks aligned with the constraining ring detent slot positions and capable of entry into the detent slots, thereby providing for the synchronous rotation of the revolving guide ring elements and the constraining rings. When the lamp pipes drive the constraining rings into rotation, the revolving guide ring element beveled sides are forced against the constraining ring sloped surfaces and become tightly ensconced within the inner circumference of the lamp pipes. As such, assembly is simple and enables user self-assembly and, furthermore, since each steel pipe can be disassembled, shipping dimensions are minimized.
Owner:HSIEH PI HUA
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