JPS5829894Y2 - electron gun structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electron gun assembly, particularly to a resistive element that supplies a focus voltage to the interior of a cathode ray tube by using a resistance division method to supply a high voltage.

Conventionally, a resistive element that supplies a focus voltage to a focus electrode forming a part of an electron gun structure is made of, for example, Ag-Pd, Ru0, on the upper surface of an insulating support for supporting the electron gun electrode.
It was formed by applying a high-resistance material containing a binder and glass frit to 2 in the form of a belt, or by applying a resistor circuit pattern and printing the high-resistance material from above.

For this reason, the length of the resistance element may vary, making it impossible to obtain the desired resistance value, and because the resistance material is coated on the top surface of the insulating support, the potential difference between adjacent high-resistance materials may occur in the middle of the resistance circuit. It had the disadvantage of causing electric discharge at the bending portion which becomes larger.

Therefore, the purpose of the present invention is to provide a groove with a resistor circuit pattern on the top surface of an insulating support, and fill the groove with a high-resistance material, thereby making the resistance length constant and the potential difference between adjacent high-resistance materials. This prevents electrical discharge at the bending portion where the amount of energy increases.

The electron gun assembly according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram illustrating the main parts of an electron gun assembly according to the present invention, particularly an example of an in-line three-beam integrated electron gun assembly housed in a color cathode ray tube.

In the figure, 1 is the neck of a color cathode ray tube, 2 is an internal conductive film extending from the inner wall of the neck part 1 to the inner wall of the funnel part (not shown), and 3 is a high voltage supplied to the internal conductive film 2, which is introduced into the electron gun. A contactor 14 is disposed through the end face of the neck portion 1 to supply power to the electron gun, a stem lead 5 is a cathode of each electrode of the electron gun, 6 is a first grid, 7 is a second grid, and 8 is a focus electrode. is the third grid, 9 is the fourth grid, and 10 is the shield cup.

Further, 11 is an insulating support made of multiform glass, and this insulating support 11 is connected to the cathode 5. 1st
grid 6, second grid 7, third grid 8. The electron gun electrode group consisting of the fourth grid 9 and the shield cup 10 is firmly held and fixed on the same axis.

Further, on the outer surface side of the insulating support 11, that is, on the back side of the electrode group fixing part, a groove 12 is formed in a zigzag shape along the longitudinal direction, as shown in FIG.

As shown in FIG. 3, a high-resistance material 13 is poured and filled into the groove 12 to form high-resistance elements 14A and 14B having different resistance values.

(See Figure 1). In this case, the length of the groove 12 is determined from the resistance value per unit length of the high resistance material 13 and the high resistance division ratio for providing a desired focus voltage to be applied to the focus electrode.

Further, a midpoint 14C between the high resistance elements 14A and 14B is a tap point from which the focus voltage is taken out, and this midpoint 14C is connected to the third grid 8, which is a focus electrode, via a conductor 15, and the high resistance The terminal 14a on the element 14A side is connected to the shield cup 10 via the conductor 15, and the terminal 14b on the high resistance element 14B side is connected to the conductor 1
5 to a stem lead 4, which is connected to a variable resistance element 16, and the other end thereof is grounded.

In the electron gun assembly configured in this way, a high voltage of about 25 KV supplied to the anode of a color cathode ray tube (not shown) is applied to the internal conductive film 2, and the shield cup 10
The fourth grid 9 is supplied via a contactor 3 attached to the fourth grid 9.

In other words, the terminal 14a of the high resistance elements 14A and 14B has approximately 2
A high voltage of 5KV will be applied.

Then, high resistance elements 14A, 1 provided on the insulating support 11
4B and the externally provided variable resistance element 16 are connected to the intermediate point 14C between the high resistance elements 14A and 14B using a resistance division ratio of about 20% of the high voltage of about 25KV applied to the fourth grid 9.
% focus voltage is applied to the variable resistance element 16.
By setting variably, the electron beam can be optimally focused on the fluorescent surface.

For example, if the resistance value of the high-resistance element 14A is 90MQ, the resistance value of the other high-resistance element 14B is 20MΩ, and the external variable resistance value is set to 0 to 15MJ7, the intermediate point 14C for focus voltage extraction has a resistance of about 4 to A focus voltage of 7KV can be extracted.

In the above embodiments, the case where the electron gun assembly uses a pi-potential type electron gun is explained, but the present invention is not limited to this, and can be applied to a pi-potential type electron gun of a general cathode ray tube, a unipotential type electron gun, etc. It can also be used in electron guns and multi-stage focusing electron guns.

As explained above, according to the electron gun assembly according to the present invention,
The resistance value is determined simply by filling the predetermined grooves of the insulating support with a high-resistance material, which is extremely effective in terms of mass production.

In addition, since the grooves are filled with high-resistance material, adjacent parts are separated by multiform glass, which is an insulating support, which prevents discharge in parts with large potential differences, such as roundabout curves of the resistance pattern. You can get excellent effects such as:

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a main part showing an example of an electron gun structure according to the present invention, and FIGS. 2 and 3 are a perspective view and a sectional view of a main part showing an example of an insulating support of an electron gun structure according to the present invention. It is. 1... Neck part, 2... Internal conductive film,
3... Contactor-14... Stem lead, 5... Cathode, 6... First grid, 7... Second grid, 8...
3rd grid (focus electrode), 9...4th
Grits, 10...Shield Cup, 11...
... Insulating support, 12 ... Concave groove, 13 ...
...High resistance material, 14A, 14B...High resistance element, 14a, 14b...Terminal, 14 C.
...Middle point, 15...Conductor, 16...
...Variable resistance element.

Claims (1)

[Scope of utility model registration request] In an electron gun assembly including an insulating support for holding and fixing a plurality of electrode groups, a groove is provided on the surface of the insulating support,
filling the groove with a high-resistance material to form a high-resistance element;
An electron gun assembly characterized in that a focus voltage is supplied to the focus electrode from a part of the high resistance element.