Illumination meter dial device

Signals and indicators – Indicators – Scale structure

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116334, G01D 1318

Patent

active

048754331

ABSTRACT:
An illumination meter dial device comprises a transparent base plate (32); a black semitransparent layer (38) coated on the transparent base plate so as to form marks (28 or 30); a black opaque layer (40) coated so as to cover a margin and an outer periphery of the mark formed by the black semitransparent layer (38); and a white semitransparent layer (42) coated so as to cover a margin of the black opaque layer (40) and all over the dial plate except the marks. In the daytime, the marks (28, 30) can be seen in black in contrast with the white dial plate irradiated by sunlight from the outside; in the evening, margins of the marks formed by the black opaque layer (40) not covered by the white semitransparent layer (38) can be seen in black in contrast with the marks and the dial plate irradiated with sunlight from outside and illuminated by the lamp from inside; and in the night, other thick margins of the marks formed by the black opaque layer (40) can be seen in black in contrast with the marks and dial plate illuminated by the lamp from inside.

REFERENCES:
patent: 2595973 (1952-05-01), Neugass
patent: 2664849 (1954-01-01), Nallinger
patent: 3499417 (1970-03-01), Heinke
Patent Abstracts of Japan, P 605, Aug. 15, 1987, vol. 11/No. 252.
Geiser et al., PDV-Berichte, Oct. 1977.

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