Acoustic touchscreen constructed directly on a cathode ray tube

G - Physics – 06 – F

Patent

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G06F 3/033 (2006.01)

Patent

CA 2356443

A touchscreen is constructed directly on the glass surface of a cathode ray tube (CRT) (15). To solve the problem of insufficient space between the CRT's bezel and frontal region (16) to accomodate the transducers (20) for the touchscreen, the transducers (20) are moved away from the frontal region (16), to the highly curved shoulder region (17) of the CRT (15). To preserve acoustic signal strength, the positioning of the transducers (20) is chosen to take advantage of the fact that an acoustic wave on a non-Euclidian surface travels along a geodesic path (31). Allowance is also made for the acoustic lens and prism effect of the corner regions (26) of the CRT (15), where the transducer (20) may be located.

Un écran tactile est construit directement sur la surface en verre d'un tube cathodique (CRT) (15). Pour résoudre le problème de l'espace insuffisant entre la lunette d'encadrement du tube cathodique et la région frontale (16) afin de recevoir les transducteurs (20) de l'écran tactile, les transducteurs (20) sont éloignés de la région frontale (16), vers la région d'épaulement (17) fortement incurvée du CRT (15). Pour préserver l'intensité du signal acoustique, le positionnement des transducteurs (20) est choisi pour tirer avantage du fait qu'une onde acoustique sur une surface non euclidienne se déplace le long d'un chemin géodésique (31). Une tolérance est également obtenue pour l'effet de lentille et de prisme acoustique des régions de coin (26) du CRT (15) où l'on peut également placer le transducteur (20).

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