JPH0612655B2 - Electrode structure for electron gun of color picture tube - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an electrode assembly for an in-line type electron gun of a color picture tube.

[Background of the Invention]

The electrode assembly for an in-line type electron gun of a color picture tube generally has an electrode structure for emitting a row of a plurality of electron beams so as to travel substantially parallel to the tube axis in a single electron gun assembly, and constitutes the main lens thereof. The counter electrode used for this purpose is provided with a row of electron beam passage holes, and the edges of the electron beam passage holes are narrowed inward.

Conventionally, in order to improve the focus characteristics of such a color picture tube, as shown in, for example, Japanese Utility Model Publication No. 56-51648, a central electron beam passage hole and both sides thereof are provided inside a counter electrode forming a main lens. An auxiliary electrode consisting of a side wall portion existing in the space between the electron beam passage hole and the bottom portion connecting the side wall portion is provided, and the bottom portion of this auxiliary electrode is fixed to the side wall portion of the counter electrode, The immersion electric field is corrected.

However, since one end of the side wall of the auxiliary electrode is free, the relative position of the side wall with respect to the electron beam passage hole fluctuates, which is a problem in terms of characteristics.

[Object of the Invention]

An object of the present invention is to provide an electrode assembly for an electron gun of a color picture tube, which can always keep the relative position of the auxiliary electrode with respect to the electron beam passage hole at a constant value.

[Outline of Invention]

According to one embodiment of the present invention, two L-shaped auxiliary electrodes are provided inside the counter electrode forming the main lens, and these are fixed to one side surface of the side wall of the counter electrode. An integral coffin is attached to the electrode so as to surround the central electron beam passage hole.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Electron beam passage holes 3A, 3B and 3C are formed in a line on the bottom surface 2 of the focusing electrode 1 which constitutes the counter electrode. Inside the focusing electrode 1, an electron beam passage hole 3A,
Two L-shaped auxiliary electrodes 10 are arranged so as to be present in the space between 3B and 3C, and these auxiliary electrodes 10 are fixed to one side surface of the side wall of the focusing electrode 1 at a welding point position 11. ing. Further, an integral sleeve 12 is attached to the two L-shaped auxiliary electrodes 10 so as to surround the central electron beam passage hole 3B.

In this way, the electron beam passage holes 3A, 3
Since the portion existing between B and 3C is integrated by the integral body 12, the strength of the auxiliary electrode 10 is increased, and the relative position of the auxiliary electrode 10 with respect to the electron beam passage holes 3A, 3B and 3C is always a constant value. Reserved.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, inside the counter electrode, the counter electrode of the counter electrode is formed so as to exist in the space between the central electron beam passage hole and the electron beam passage holes on both sides thereof. Two L-shaped auxiliary electrodes fixedly attached to one side surface of the side wall portion are provided, and an integral shaft is attached to these auxiliary electrodes so as to surround the central electron beam passage hole. The relative position with respect to is always secured at a constant value, and the characteristics can be improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of a structure for an electron gun according to the present invention,
(a) is a front view, (b) is a cross-sectional view, FIG. 2 shows an auxiliary electrode to which an integral blade is attached, (a) is a front view, and (b) is a bottom view. 1 ... Focusing electrode, 3A, 3B, 3C ... Electron beam passage hole,
10 ... auxiliary electrode, 11 ... welding point position, 12 ... integrated board.

Claims (1)

[Claims] 1. An electrode structure for emitting a row of a plurality of electron beams that travels substantially parallel to a tube axis within a single electron gun structure, and a row of opposing electrodes used to form a main lens of the row. In an electron gun electrode structure of a color picture tube of a type having an electron beam passage hole and narrowing an edge portion of the electron beam passage hole inward, a central electron beam passage hole and both sides thereof are provided inside the counter electrode. The two L-shaped auxiliary electrodes fixed to one side surface of the side wall of the counter electrode are provided so as to be present in the space between the electron beam passage hole and the electron beam passage hole in the center. An electrode assembly for an electron gun of a color picture tube, characterized in that an integral casing is attached so as to surround the hole.