Visual display with magnetic overlay

Details Visual display with magnetic overlay Visual display with magnetic overlay

1977-02-03

1978-07-18

Pitts, Harold I.

Communications: electrical

Audible indication

Percussion-type sound producer

340381, 340378A, 40621, G09F 704

Patent

active

041018842

ABSTRACT:
An imperforate display membrane is backlit by placing an apertured support between a light source and the display membrane so that light travels through the support and forms a spot on the membrane at a desired position having display indicia in registration therewith. One or more overlay members are provided and with said members having revised indicia thereon which either up-dates, corrects or otherwise revises the indicia on the original membrane. The membrane support and each overlay member are constructed to provide mutual magnetic attraction therebetween. Furthermore, each overlay member is provided with an opening which is adapted to register with the light aperture in the membrane support when the overlay member is magnetically held in place to the support and over the old indicia.

REFERENCES:
patent: 3010235 (1961-11-01), Roberts
patent: 3666936 (1972-05-01), Webster
patent: 3928921 (1975-12-01), Gurman
patent: 3987567 (1976-10-01), Fritts
patent: 3988845 (1976-11-01), Boatman

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