GB507556A - Improvements in or relating to scales illuminated by edge lighting for wireless receiving and other apparatus - Google Patents

Abstract

507,556. Adjusting wireless apparatus; illuminating clocks; indicating dials &c. HAUSERMANN VEREINIGTE FABRIKEN CHEMISCHER GRAVUREN UND METALLWAREN GES. Dec. 18, 1937, No. 35136 and 35137. Convention dates, Dec. 18, 1936 and May 28, 1937. [Class 37] [Also in Groups XVIII and XIX] An edge-lit scale for watches, clocks, measuring apparatus, tuning scales for wireless apparatus &c. is lit from one edge only and comprises a front transparent plate. bearing the matter to be illuminated, spaced approximately 1/10 mm. from a dark background plate to which it is secured peripherally by a raised edging or border. As applied to a tuning scale for a wireless receiver,. a front transparent plate A of glass, mica or synthetic material, has the scale indicia D, E, printed on its front or rear surface and is secured to the back-plate B of glass, metal, synthetic material, &c. by a raised border C, for example, of Chatterton's compound. The back-plate, if of glass, is rendered opaque or translucent except along strips F lying behind the waveband scales E through which a luminous tuning spot or pointer moving behind the rear plate may be seen.. The several wave-band scales E and lists of station names D may be differentially coloured, and the front plate may be made up of a plurality of juxtaposed elements separately illuminated by sources at one edge of each element, the juxtaposed edges forming screws preventing passage of light between adjacent elements whereby the latter may be selectively illuminated.