Electrode of electron gun for cathode ray tube

Details Electrode of electron gun for cathode ray tube Electrode of electron gun for cathode ray tube

1999-06-21

2001-06-12

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

C313S410000, C313S414000

Reexamination Certificate

active

06246166

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electrode of an electron gun for a cathode ray tube (CRT), and more particularly, to an electrode of an electron gun for a CRT with an improved structure so as to enhance flatness of the electrode.
2. Description of the Related Art
Generally, an electron gun for a CRT is formed by embedding a cathode and a plurality of electrodes constituting an electrostatic lens in a bead glass such that they are spaced apart from one another. The embedded part of the electrode for an electron gun is usually fixed on the bead glass using a fusion splicer. As shown in
FIG. 1
, a heated bead glass
100
mounted on a holder
12
is pressed on electrode supports
14
a
of the electrodes
14
at both sides of an electrode assembly
11
on which a plurality of electrodes
14
constituting an electron gun are supported, so that the electrode supports
14
are embedded in the bead glass
100
.
However, when the electrodes of an electron gun for a CRT are assembled in such a manner, a stress due to pressing of the bead glass
100
is applied to the electrode supports
14
a
of the electrodes
14
, which is eventually applied the overall electrodes. Thus, the flatness of an electron beam passing plane on which electron beam passing holes are formed is significantly degraded.
Also, in the course of a pressing process performed for forming an electrode into a predetermined shape, a residual stress applied to the electrode due to plastic deformation deforms the electrode, by which the flatness of the electron beam passing plane may be degraded.
If the flatness of electrodes of an electron gun is worsened due to the above-described factors, the electrostatic lens formed between electrodes of the electron gun may be distorted, thereby disabling to focus and accelerate electron beams in a desirable manner.
SUMMARY OF THE INVENTION
To solve the above problem, it is an object of the present invention to provide
It is another object of the present invention to provide an electrode of an electron gun for a cathode ray tube which can prevent the flatness of an electron beam passing plane of the electrode from being degraded during electrode assembly and fabrication, by increasing the structural strength of the electrode.
Accordingly, to achieve the above object, there is provided an electrode of an electron gun for a cathode ray tube including an electron beam passing plane on which one or more electron beam passing holes are formed, an upper sloping portion of a truncated cone shape, slantingly extending downward and outward from the peripheral edges of the electron beam passing plane, and a vertically extending portion of a cylindrical shape, extending downward from the lower portion of the upper sloping portion and extending substantially perpendicular to the electron beam passing plane.
According to another aspect of the present invention, there is an electrode of an electron gun for a CRT further including a lower sloping portion of a truncated cone shape, slantingly extending downward and outward from the lower portion of the vertically extending portion, and a flange extending from the lower portion of the lower sloping portion in a direction substantially parallel to the electron beam passing plane.
Preferably, the conical generatrices of the upper and lower sloping portions are curved.

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