Display element write sensor

Communications: electrical – Audible indication – Percussion-type sound producer

Patent

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Details

3403782, 340166R, G08B 522

Patent

active

041568729

ABSTRACT:
A drive is provided for a rotatably mounted display element which is distinctively colored on opposite sides and having a magnet rotatable therewith defining a magnetic axis transverse to the axis of rotation, a pole piece of reversible permanently magnetizable material, designed so that the reversible field of said pole piece will produce opposite orientations of said display element, a coil for energizing said pole piece. There is provided means for determining from the characteristics of current resulting from voltage applied to said coil whether or not the polarity of said pole piece is being reversed.

REFERENCES:
patent: 4069480 (1978-01-01), Helwig

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