JPS5929324Y2 - Stem for cathode ray tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stem for a cathode ray tube, and is particularly intended to prevent the generation of sparks within the cathode ray tube.

Generally, in order to improve the resolution of a cathode ray tube, it is necessary to reduce the beam diameter of the electron beam.

There are two ways to reduce the beam diameter of this electron beam: increasing the final acceleration voltage of the electron beam, and increasing the potential of an intermediate electrode such as a focus electrode.

The voltage at the intermediate electrode is generally applied by an external power source via a stem pin that passes through a stem glass body at the end of the cathode ray tube.

When the voltage of this intermediate electrode is increased, the electric field around the electrode feeder line connecting the stem pin and the intermediate electrode becomes stronger, and discharge sparks and microdischarges are more likely to occur within the tube.

If these occur frequently, the operation of the cathode ray tube becomes unstable and its lifespan is shortened.

In particular, when the electrode feed line has sharp irregularities, the electric field at the sharp irregularities becomes extremely strong (and the above-mentioned tendency becomes remarkable).

On the other hand, conventionally, electrode feeding lines have been spot-welded to stem pins using thin wires due to manufacturing reasons.

Therefore, it was inevitable that quite sharp uneven portions would be formed in this welded portion.

The present invention solves the above-mentioned conventional drawbacks, reduces unevenness at the connection between the stem pin and the electrode feeder line, and alleviates the high electric field generated at this connection, thereby improving high voltage characteristics. An embodiment of the present invention will be described below with reference to the drawings.

The figure is a longitudinal sectional view of the stem for a cathode ray tube of this embodiment.

In the figure, 1 is a stem glass body at the 2nd end of the neck tube of a cathode ray tube.

Stem pins 3, 4.5 pass through the stem glass body 1 and are fused and fixed thereto.

Reference numerals 6, 7, and 8 are electrode feed lines connected to each electrode (not shown) in the cathode ray tube.

Reference numerals 9 and 10°11 are mushroom-shaped connectors, with cylindrical portions 9a, 10a, and 11a and bowl-shaped cylindrical portions 9b and 10b, respectively.

11b, and within the cylindrical portions 9at 10a, 11a, the stem pins 3, 4.5 and the pole feed lines 6, 7.8 are connected by welding or the like.

Further, the cylindrical portions 9b, 10b, and 11b are located on the electrode side.

In the above configuration, the cylindrical portion 9a of the connector 9, 10.11
, 10a, 11a even if the surfaces of the cylindrical parts 9a, 11a are uneven due to welding.

Since 11a is covered by the cylindrical parts 9b, 10b, and 11b, no high electric field is generated due to the unevenness, and since the difference parts 9b, 10b, and 11b are bowl-shaped, electric lines of force are concentrated there. The electric field is significantly relaxed.

This eliminates the cause of discharge sparks, making it possible to safely increase the potential of intermediate electrodes such as the focus electrode.

For example, the difference part 9b of the connectors 9, 10.11.

The radius of 10b and 11b is 5rIrM, and the length of the cylindrical part is 2.
When used as a cylinder, no discharge spark occurs even when a voltage of up to about 15KV is applied, making it possible to increase the voltage applied to the electrodes compared to the limit of 8KV in the case of the conventional configuration. has been proven.

Note that if the surfaces of the difference portions 9b, 10b, and 11b are made smooth by electric field polishing or the like, discharge sparks are even less likely to occur.

As described above, the cathode ray tube stem of the present invention electrically connects the stem pin and the electrode feeder wire within the cylindrical portion of the mushroom-shaped connector, and this connection makes it possible to generate discharge sparks, thus reducing the internal flow inside the cathode ray tube. The voltage applied to each electrode can be increased.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view of a stem for a cathode a-tube showing an embodiment of the present invention. 1... Stem crow body, 3,4.5...
・Stem pin, 6, 7, 8... Electrode feeder line, 9
,10.11...Connector, 9a, 10a, 11
a... Cylindrical part, 9b, 10b, llb...
...Difference.

Claims (1)

[Scope of utility model registration request] A stem glass body of a cathode ray tube, a stem pin passing through the stem glass body, an electrode feed line connected to an electrode in the cathode ray tube, and a mushroom-shaped connector having a bowl-shaped cylindrical portion and a cylindrical portion. . A stem for a cathode ray tube, wherein the electrode feed line and the stem pin are connected by welding within the cylindrical portion, and the cylindrical portion is located on the electrode side and covers the cylindrical portion.