Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1989-10-06
1991-11-12
Oberley, Alvin E.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
33 1M, 33 1N, 340709, G09G 302
Patent
active
050651455
ABSTRACT:
A method and apparatus for indicating the position of a cursor on a surface in first and second different directions. The cursor is mounted on a member such as a gantry, and the gantry is guided for movement in the first direction on a carriage. The carriage is mounted for movement in the second direction on a member such as a rail. Radiation reflection strips extending and an acute angle with respect to one another are mounted on the gantry, and adapted to reflect light from a linear light source on said rail and extending in the second direction. Reflected light is sensed by a linear detector on said rail, for producing signals corresponding to the locations from which light was reflected. The coordinates of the cursor are determined by triangulation from these signals.
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patent: 3956588 (1976-05-01), Whetstone et al.
patent: 4331954 (1982-05-01), Bauman et al.
patent: 4530243 (1985-07-01), Lund et al.
patent: 4892407 (1990-01-01), McMurtry et al.
patent: 4932131 (1990-06-01), McMurtry et al.
Miller Darin
Oberley Alvin E.
Summagraphics Corporation
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