Device for illuminating measuring instruments

Details Device for illuminating measuring instruments Device for illuminating measuring instruments

1984-07-27

1987-04-07

Miller, Carl Stuart

Illumination

Illuminated scale or dial

Internal light source

73431, 362221, 315 85, 313115, G01D 1128

Patent

active

046565612

ABSTRACT:
A cold cathode discharge tube is disposed as a light source on the front side of a display unit, and a grounded connector is disposed on and/or in the neighborhood of the outer periphery of the cold cathode discharge tube. The conductor causes electric noise generated from the cold cathode discharge tube to flow to the ground, thus preventing the rupture and erroneous operations of the liquid crystal display unit accommodating driving ICs.

REFERENCES:
patent: 2581959 (1952-01-01), Koehler
patent: 2653270 (1953-09-01), Kompfner
patent: 2845474 (1958-07-01), Langworthy
patent: 3779640 (1973-12-01), Kidd
patent: 3867623 (1975-02-01), Widlund
patent: 3996493 (1976-12-01), Davenport
patent: 4033191 (1977-07-01), Kreuz
patent: 4419719 (1983-12-01), Boer
patent: 4504891 (1985-03-01), Mazis

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