Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1988-12-13
1991-02-05
Brier, Jeffery A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340784, 340765, 341 31, G09G 336
Patent
active
049909010
ABSTRACT:
An apparatus for providing a control signal utilizes a liquid crystal panel and means for transiently forming transparent windows therein. There is a source of electromagnetic radiation (EMR) adjacent the panel and positioned to pass EMR through transiently open windows. There is an EMR detector positioned adjacent the source and a defined EMR path between the source and detector which path is formed in response to a transiently open window and includes an area for the positioning of an object to occlude the EMR radiation passing between the source and detector. The path also includes a reflector which directs EMR from the source back in the same general direction to the detector. There is a timing and logic circuit correlating the opening of the transient windows and the detection of EMR at said detector to provide a control signal.
REFERENCES:
patent: 4774404 (1988-09-01), Hasegawa et al.
patent: 4820050 (1989-04-01), Griffin
patent: 4837430 (1989-06-01), Hasegawa
patent: 4847606 (1989-07-01), Beiswenger
Brier Jeffery A.
Technomarket, Inc.
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