Acoustic touchscreen constrted directly on cathode ray tube
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A touch screen, sound technology, applied in the input/output process of data processing, instruments, mechanical mode conversion, etc., can solve problems such as unavailability
Inactive Publication Date: 2005-01-05
ELO TOUCHSYST
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However, the piezoelectric element of the grating sensor must be placed under the tou
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[0061] The sensor typically applied to sound touch screens is a wedge sensor, as disclosed in Davis-Cannon et al., US 5,739,479 (1998), which is incorporated herein by reference. Therefore, this description specifically refers to wedge sensors, although our invention is not limited to wedge sensors. Other sensors may also be used, such as the interdigital sensor of Kent, US 5,708,461 (1998), as shown in Figure 4, which is incorporated herein by reference. Figure 4 here shows a cross-sectional view of a wedge sensor 20 mounted on the surface of the touch screen 1, and with a piezoelectric element 21 as a component, a coupling wedge 22, made of plastic, such as poly (methyl) Acrylate) (PMMA). The wedge shape 22 is adhered to the surface of the touch screen 1 by an adhesive, such as a UV curable adhesive, so that one is connected to the other audibly. The piezoelectric element 21 is mounted on the back of the coupling wedge 22 and is electrically connected to the electronic controlle...
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Abstract
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.
Description
Technical field [0001] The invention relates to an acoustic touch screen directly built on a cathode ray tube and a method thereof. Background technique [0002] The sound touch screen has a touch-sensitive area where touch events and touch positions are felt through the effect of touch on sound wave transmission. A common type of acoustic touch screen is Rayleigh wave (a term used here, including quasi-Rayleigh wave). The disclosed examples of Rayleigh wave touch screens include: Adler, US 4,642,423 (1987); US 4,645,870 (1987); US 4,700,176 (1987); US 4,746,914 (1988) (hereinafter referred to as "Adler'914"); US 4,791,416 (1988) and Re 33,151 (1990); Adler et al., US 4,825,212 (1989); US 4,859,996 (1989); and US 4,880,665 (1989); Brenner et al., US 4,644,100 (1987); Davis-Cannon et al., US 5,739,479 (1998); and Kent, US 5,708,461 (1998) and US 5,854,450 (1998). It is also known that sound touch screens use other types of sound waves, such as Lamb waves or shear waves, or combina...
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