Telegraphy – Systems – Position coordinate determination for writing
Patent
1975-08-29
1977-03-15
Robinson, Thomas A.
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
040125882
ABSTRACT:
An apparatus for determining the position of a movable element or stylus which is movable in a data space. In accordance with the invention there are provided first and second spaced receivers, each receiver comprising a hollow shell of piezoelectric material, which may be cylindrical or spherical in shape, and resilient conductive means coupled across the inner and outer surfaces of the shell. Means are provided for periodically generating a source of sound waves for travel between the stylus and the first and second receivers. Timing means are coupled to the receivers and synchronized with the generation of the sound waves for measuring transit time of the sound waves between the source and receivers. Computing means are employed to determine the positional coordinates of the stylus in a desired coordinate system, such as rectangular coordinates. In an embodiment of the invention the first and second receivers have conductive mesh loaded within the shell and in contact with the inner surface of the shell. In this embodiment a spring contact is coupled to the outer surface of the shell. In an embodiment of the invention the movable element or stylus is passive and means are provided for periodically generating sound waves at a source position spaced from the movable element. This eliminates the need for an "active" stylus and the problems associated therewith.
REFERENCES:
patent: 3355603 (1967-11-01), Hesse et al.
patent: 3613066 (1971-10-01), Cooreman
patent: 3692936 (1972-09-01), Moffitt
patent: 3731273 (1973-05-01), Hunt
patent: 3821469 (1974-06-01), Whetstone et al.
patent: 3838212 (1974-09-01), Whetstone et al.
Davis Robert L.
Howells Joseph A.
Novack Martin
Robinson Thomas A.
Science Accessories Corporation
LandOfFree
Position determining apparatus and transducer therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Position determining apparatus and transducer therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Position determining apparatus and transducer therefor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-426941