JPS61234182A - Television receiver - Google Patents

Abstract

PURPOSE:To obtain a good video image having no interference on a picture plane of a cathode ray tube by directly connecting a conductive film outside the cathode ray tube to an earth of a power circuit by a lead wire to prevent an interference signal generated on the conductive film outside the cathode ray tube from entering a video image amplifying circuit. CONSTITUTION:A grounding conductive wire 2 formed in a U-shape is contacted with an outer conductor 5 made of graphite of a cathode ray tube 1 and therefrom in one way, connected to an earth of a printing plate 4 of a neck section by an earth wire 3. In the other way, it is connected to an earth of a print plate of a power circuit 9 by another earth wire 7 through a resistor 8 having an impedance below 100OMEGA for instance, 10OMEGA on the print plate. According to the above-mentioned construction, an unnecessary voltage produced on the conductive film outside the cathode ray tube is flowed to the earth of the power circuit to reduce the influence of the interference to the neck print and thereby obtain a good quality of a picture image. For a distance pulse in the tube, the pulse below 100OMEGA is prevented from entering a signal system circuit to prevent the destruction of a semiconductor element of the signal system circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for reducing unnecessary images appearing on a cathode ray tube screen of a television receiver or the like due to pulses generated by a power supply circuit that supplies the cathode ray tube to the cathode ray tube. This invention relates to a television receiver using a ground wire.

2. Description of the Related Art In general, a peripheral device for a cathode ray tube such as a television receiver has a cathode ray tube 1° power supply circuit 9, as shown in FIG.
It consists of a signal system circuit 10. A conductive film 5 coated on the outside of the cathode ray tube 1 is normally connected from a grounding conductive wire 2 to a neck printed board 4 for the final stage circuit of video amplification attached to the neck socket of the video cathode ray tube 1. It is connected by the ground wire 3 and is further connected to the ground #i! of the power supply circuit 9 that drives the cathode ray tube 1 from here. 6.

Problems to be Solved by the Invention In such a conventional device, when unnecessary voltage generated in the external conductive film 5 of the cathode ray tube 1 reaches the power supply circuit 9 via the ground of the video amplification final stage circuit, the neck printed board There was a problem in that an interference signal was mixed into the video amplification final stage circuit built into the video tube 4, and an unnecessary video appeared on the screen of the cathode ray tube 1.

The present invention solves these conventional problems and provides a television receiver that has a simple configuration and can display clear images without interference.

Means to Solve the Problem The television receiver of the present invention directly connects the external conductive film of the cathode ray tube, which is the source of interference, and the ground of the power supply circuit with a lead wire, without passing through the ground of the final stage circuit of video amplification. This is how it was done.

Function: In the television receiver of the present invention, the external conductive film of the cathode ray tube is directly connected to the ground of the power supply circuit using a lead wire, so that interference signals generated on the external conductive film of the cathode ray tube are prevented from entering the video amplification circuit. It is possible to obtain good images without interference on the cathode ray tube screen.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. As shown in FIG. 1, a U-shaped ground conductive wire 2 is brought into contact with the graphite outer conductor 5 of the cathode ray tube 1, and from this, on the other hand, the neck portion is printed using the ground wire 3. Connect to the ground on board 4.

On the other hand, another ground a7 is connected to the ground of the printed circuit board of the power supply circuit 9 through a resistor 8 having an impedance of 100 Ω or less, for example 10 Ω, on the printed board.

Effects of the Invention As described above, according to the television receiver of the present invention, 1.
The ground of the external conductive film of the cathode ray tube is connected to the ground of the power supply circuit through an impedance of 00Ω or less, and the unnecessary voltage generated in the external conductive film of the cathode ray tube is passed to the ground of the power supply circuit to achieve cinematographic printing. It is possible to reduce the influence of interference and thus obtain high quality images.

Further, with respect to the tube discharge pulse, it is possible to prevent the pulse from flowing into the signal system circuit by using a resistor of about 1 ooΩ or less, and it is possible to prevent the semiconductor elements of the signal system circuit from being destroyed.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a television receiver according to an embodiment of the present invention, and FIG. 2 is a perspective view of a conventional television receiver. 1...Cathode ray tube, 2...Grounding conductive wire, 3...Earth wire, 4...Neck printed board, 6...External Conductive film, 6-... Earth wire, 7... Earth wire, 8... Resistor, 9... Power supply circuit, 1o... Signal system circuit.

Claims (1)

[Claims] A ground wire connecting the external conductive film of the cathode ray tube and the ground of the power supply circuit that drives the cathode ray tube through a resistor of 100Ω or less, and a printed board attached to the neck of the image receiving cathode ray tube from the external conductive film of the cathode ray tube. A television receiver having a ground wire connected to the ground of the power supply circuit via the ground of the television receiver.