Cathode-ray tube socket substrate

Claim 1

A cathode-ray tube socket assembly, comprising: (A) an insulating substrate having N through holes formed therein, N being an integer greater than 1; (B) N electrodes provided on said subtrate, each said electrode being associated with a respective said through hole; (C) a cathode-ray tube socket having N pin terminals and being located on a first side of said substrate, one of said pin terminals being a focus electrode pin terminal and extending through a first said through hole and being electrically connected to the electrode associated with said first through hole, each of the remaining said pin terminals being inserted into a respective one of the remaining said through holes and being electrically connected to said electrode which is associated with the said through hole through which said pin terminal extends; (D) a color output circuit mechanically coupled to said substrate and electrically connected to at least one of said pin terminals of said cathode-ray tube socket; and (E) a high-voltage variable resistor provided on said insulating substrate for applying a focus voltage to said focus electrode pin terminal of said socket, said high-voltage variable resistor comprising: (1) a center electrode electrically connected to said electrode associated with said first through hole; (2) an arcuate film resistor defining a variable resistance part, said film resistor and said center electrode being located on a second side of said insulating substrate which is opposite said first side of said insulating substrate; and (3) a rotary shaft provided with a slider, one part of which is in contact with said center electrode, a second part of which is in contact with and slides along said arcuate film resistor; and (F) an insulating casing mounted on said insulating sustrate and covering both said film resistor and said center electrode, said casing rotatably supporting said rotary shaft.