Television cathode ray tube having a voltage divider providing t

Details Television cathode ray tube having a voltage divider providing t Television cathode ray tube having a voltage divider providing t

1977-09-01

1979-03-06

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

313450, 315 52, H01J 2996

Patent

active

041432983

ABSTRACT:
An improved internal voltage divider for use in a television cathode ray tube is disclosed that provides one or more temperature-invariant voltages. The tube is subject to internal spatial temperature patterns fixed or varying with time which are incidental to tube warm-up and operation. The voltage divider according to the invention is comprised of at least two electrically series connected resistive sections having like temperature coefficients, and having resistive values of the same order of magnitude. Each section is so positioned and arranged relative to the aforesaid temperature patterns as to have similar average temperature experiences. The voltage divider is connected between a relatively high anode voltage and a suitable low-voltage terminal for receiving a relatively low voltage through the base of the tube. Means are provided for tapping off at least one temperature-invariant intermediate voltage. Due to the similiarity of the spatial average temperature experiences of the resistive sections comprising the voltage divider, the ratio of the resistive values of the resistive sections, and thus the ratio of voltage drops thereacross does not change despite variations in the temperature patterns. An associated method provides for positioning and arranging the discrete sections comprising the voltage divider.

REFERENCES:
patent: 2771566 (1956-11-01), Baracket
patent: 3299316 (1967-01-01), Wollrich
patent: 3932786 (1976-01-01), Campbell

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