US 4,402,037 AGranted

Cathode-ray tube socket substrate

AssigneeMurata Manufacturing Co., Ltd.

InventorsEiji Iwamura, Keiichi Motoyama

Life of this patent

Estimating the term…

Loading patent…

Abstract

A cathode-ray tube socket substrate, which is to be used by being attached to a cathode-ray tube in a color cathode-ray tube display unit such as a color television receiver and the like, is disclosed. The tube socket substrate comprises at least a cathode-ray tube socket, associated color output circuitry around the cathode-ray tube, and a high-voltage variable resistor, all three elements being mounted on an insulating substrate, on which is provided a film resistor forming a resistance part of the high-voltage variable resistor, and a plurality of corresponding terminal electrodes. Connected to these terminal electrodes are pin terminals for the focusing electrode of the cathode-ray tube socket, and a terminal part onto which is connected an output terminal of a rectifier circuit. Further, the high-voltage variable resistor for taking-out the focus voltage is incorporated compactly into the socket substrate, which enables the whole apparatus to be made small-sized and that without fear of causing inductive or other interference.

Claims4

Dependent claims

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.

9 more elements

Dependencies are inferred from the claim text.