H - Electricity – 01 – J
Patent
H - Electricity
01
J
355/3, 316/9, 31
H01J 29/26 (2006.01) H01J 29/50 (2006.01) H01J 29/96 (2006.01)
Patent
CA 1110364
ABSTRACT OF THE DISCLOSURE 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 simi- larity 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 varia- tions in the temperature patterns. An associated method provides for positioning and arranging the discrete sections comprising the voltage divider. - 2 -
310405
Bing Valentijn B.
Schwartz James W.
Macrae & Co.
Zenith Radio Corporation
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