Indicator

Details Indicator Indicator

1990-06-22

1992-07-14

Fields, Carolyn E.

Radiant energy

Luminophor irradiation

With ultraviolet source

2504631, 116286, G01D 1328

Patent

active

051305488

ABSTRACT:
Disclosed is an improved indicator, which includes a scale plate having a pointer rotatably mounted thereon; an ultraviolet light source for illuminating said scale plate; and indicia arranged on the scale plate for indicating a specific value in cooperation with the pointer, each of the indicia including first and second parts, and in which the second part includes fluorescent brightener therein so as to be illuminated when the ultraviolet light source is turned on. When the ultraviolet light source is turned on, particularly at night, the second parts of the indicia will become visible so that the visibility of the indicia is changed from the daylight condition in which the light source is turned off. Namely, an interesting design change of the indicia of the indicator can be obtained.

REFERENCES:
patent: 258801 (1882-05-01), Payson, Jr.
patent: 911401 (1909-02-01), Junghans
patent: 1414628 (1922-05-01), Cuntz
patent: 1951783 (1934-03-01), Beard
patent: 2459694 (1949-01-01), Gordon
patent: 2777228 (1957-01-01), Andrews
patent: 4536656 (1985-08-01), Sowa

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