Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1985-03-07
1987-12-01
Caldwell, Sr., John W.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
178 18, 250221, 250225, G09G 100
Patent
active
047107600
ABSTRACT:
A touch-sensitive device comprising a photoelastic screen having light reflecting edges and a unique light emitting/receiving module placed at two of the four corners of the screen advantageously determines the location at which a force is applied to the screen. Circularly and linearly polarized light focused into the photoelastic screen by the modules reflects off the edges of the screen and is returned to the modules where it is absorbed by a circular polarizer. The polarization of light passing through a point at which the screen is touched is changed thereby allowing these rays or signals to pass through each module's absorber. The location as well as the magnitude and direction of the force imparted to the screen by the touch is then determined from the changes in the signals that pass through the absorber.
REFERENCES:
patent: 4008960 (1977-02-01), Reytblatt
patent: 4204262 (1980-05-01), Fitelson et al.
patent: 4507557 (1985-03-01), Tsikos
patent: 4553842 (1985-11-01), Griffin
patent: 4558313 (1985-12-01), Garwin et al.
patent: 4568182 (1986-02-01), Modjallal
Nicholas Negroponte et al., One-Point Touch Input of Vector Information for omputer Displays, US Army Research Institute for Behavioral & Social Sciences, Oct. 1978, TR-78-TH, pp. 1-17.
W. B. Spillman, Jr., "Multimode Fiber-Optic Accelerometer Based on the Photoelastic Effect," Applied Optics, vol. 21, No. 15, Aug. 1, 1982, pp. 2653-2655.
Terry Costlow, "Retroreflectors Cut Component Count in CRT Touch Panels," Electronic Design, Sep. 15, 1983, pp. 41-42.
Wesley R. Iversen, "Hands-On Gestures Manipulate Objects on Display Screen," Electronics Week, Jul. 23, 1984, pp. 50-51.
American Telephone and Telegraph Company, AT&T Information Syste
Caldwell Sr. John W.
Fatahi-Yar Mahmoud
Luludis Frederick B.
LandOfFree
Photoelastic touch-sensitive screen does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photoelastic touch-sensitive screen, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoelastic touch-sensitive screen will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1933919