Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1979-03-02
1981-12-01
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
178 18, 310311, 310338, 340710, 369144, G08B 536
Patent
active
043039146
ABSTRACT:
An input device for a computer controlled visual display enables an operator to instruct the shift of a display element in a chosen direction by hand movement of the input device sensor in an analogous direction over a plane surface. The sensor includes a conventional piezoelectric audio pick-up which produces a succession of unidirectional pulses when the stylus is drawn across a microscopically textured surface such as a sheet of paper, the polarity of the pulses being indicative of the direction of motion along a selected axis. A second pick-up is arranged to give a maximum response to motion along an orthogonal axis and for the component of motion on each axis a bi-directional pulse counter enables the direction of motion to be determined by a comparison of the counts held in successive time intervals.
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patent: 3541541 (1970-11-01), Engelbart
patent: 3544774 (1970-12-01), Peklenik
patent: 3618019 (1971-11-01), Nemirovsky et al.
patent: 4078226 (1978-03-01), Eernisse et al.
National Research Development Corporation
Trafton David L.
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