Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1988-11-03
1990-04-03
Oberley, Alvin
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340783, 40449, 40452, G09F 937, G09F 1334
Patent
active
049144278
ABSTRACT:
This matrix system and method for displaying graphic characters has a vertical panel with openings arranged in a rectangular array. At each opening is a display disk rotatable 180.degree. in a path between a non-reflective upright forward facing first position, and a light reflective upright forward facing second position. Each disk is turned on a horizontal axis and can be stopped in horizontal position midway in the path of disk rotation by an electromagnetically extensible and retractable stop member. The disks are turned by interaction between an electromagnetically energized magnetic core, and a permanent magnet rotatable with the disk. Lamps behind the disk can project back light through the openings when the disks are in midway positions to display graphic characters. Retraction of the stop members allows selected disks to turn to an upright light reflective position, to display graphic characters by ambient reflected light, while remaining disks provide a light blocking non-reflective background. At dusk all disks can be turned to upright non-reflective position while all stop members are extended to stop any selectively rotated disks in a horizontal position and while the back lights are turned on. At dawn, all stop members can be retracted, lights turned off, and disks in midway position turned to upright light reflective position to display graphic characters, only by reflected light.
REFERENCES:
patent: 3680083 (1972-07-01), Pihl
patent: 4069480 (1978-01-01), Helwig
patent: 4161832 (1979-07-01), Bergamini
patent: 4163332 (1979-08-01), Salam
patent: 4295127 (1981-10-01), Sautter et al.
Loveman Edward H.
Oberley Alvin
The Staver Company Inc.
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