Electro-visual indicators

Details Electro-visual indicators Electro-visual indicators

1974-03-28

1976-01-27

Pitts, Harold I.

Communications: electrical

Audible indication

Percussion-type sound producer

340378R, 340324R, 340336, G08B 500

Patent

active

039355713

ABSTRACT:
An electro-visual indicator comprises a space having two parts. A transparent member covers one of the two parts. A magnetic fluid partially fills the space. An electromagnet is disposed so as to set up a magnetic field within the other part of the space when energized, the magnetic field being effective to draw the magnetic fluid into that part. The shape of the part behind the member is so defined that a capillary action is effective to draw the magnetic fluid into that part when the electromagnet is de-energized. The presence and absence of fluid within the part of the space visible through the transparent member are externally visually distinguishable through the member to thereby indicate the state of energization of the electromagnet. The fluid is given a color which contrasts with the background color of the space.

REFERENCES:
patent: 3648269 (1972-03-01), Rosenweig
patent: 3787839 (1974-01-01), Fayling

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