JP2000188066A - Color cathode ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color cathode ray tube provided with an electron gun having a built-in resistor having a stable and good voltage supply function. SOLUTION: A terminal 22 comprises a resistor pattern formed on a surface of an insulating plate, a conductive film for terminal connection formed on both ends and a middle of the resistor pattern, and a metal eyelet including a cylinder part 22B planted in the center of a recess of a dish-shaped flange part 22A having one or a plurality of slits 22c on the peripheral edge and a connection piece 22a integrally formed on the outer edge. The cylinder part 22B is inserted and caulked in a through hole provided so as to pass through the conductive film for terminal connection and the insulating plate, and thus, the flange 22A and the conductive film for terminal connection are made surface-contact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube, and more particularly to a color cathode ray tube having a built-in resistor for applying voltages having different potentials to a plurality of electrodes constituting an electron gun accommodated in a neck portion thereof. About pipes.

[0002]

2. Description of the Related Art A color cathode ray tube used as a monitor tube of a television receiver or an information terminal accommodates an electron gun for emitting a plurality of electron beams at one end of a vacuum envelope, and a plurality of electron guns at the other end. It has a phosphor screen (screen screen) coated with a color phosphor film. A deflection yoke is provided outside the vacuum envelope to display a required image by two-dimensionally scanning an electron beam from an electron gun on a phosphor screen.

[0003] Many color cathode ray tubes have a shadow mask which is a color selection electrode provided in close proximity to a phosphor screen, and a plurality of electron beams emitted from an electron gun are projected on each phosphor film. A color image is formed.

In order to improve the color image formed on the phosphor screen over the entire screen screen, an electron gun having a system in which a high voltage other than the anode voltage is applied to a plurality of electrodes for focusing an electron beam is provided. A known color cathode ray tube is known.

The mainstream of the electron gun is a so-called in-line type electron gun which emits three electron beams in parallel on one plane.

FIG. 6 is a side view of a main part of a color cathode ray tube accommodating an in-line type electron gun having a built-in resistor.
FIG. 7 is a side view of the electron gun in FIG. 6 viewed from an in-line direction.

The electron gun is a vacuum envelope 1 of a color cathode ray tube.
An anode (sixth grid electrode) 1 which is housed in the neck portion 32 of 0 and to which the highest voltage (anode voltage) is applied, an intermediate grid electrode 2 to which a voltage divided by the built-in resistor is supplied, A fifth grid electrode group 3 including a plurality of electrodes constituting a main lens for converging an electron beam emitted from the cathode K, a fourth grid electrode 4, a third grid electrode 5, a second grid electrode 6, And the first grid electrode 7.

Each of the electrodes 1 to 7 has a part of its outer edge embedded in a pair of insulating support rods 9 and is fixed at a predetermined order and at a predetermined interval. Reference numeral 45 denotes a stem pin for holding the electron gun and supplying a required signal.

Further, a shield cup 8 is attached to the sixth grid electrode 1.
One end of a contact spring 11 is welded to a front side surface of the contact spring.

An inner wall of the vacuum envelope 10 has a part of a neck portion for supplying an anode voltage (maximum voltage) introduced from an anode button (not shown) provided in a funnel portion to the electron gun. An inner conductive film 10a such as graphite is applied so as to extend, and the other end of the contact spring 11 is elastically contacted with the inner conductive film 10a to supply an anode voltage to the sixth grid electrode 1.

A built-in resistor 12 is attached to one of the insulating support rods 9 for fixing the electrode group of the electron gun. The built-in resistor 12 has external lead-out terminals (hereinafter simply referred to as terminals) 22, 23 and 24 for connection, and the terminal 22 is connected to a side wall of the shield cup 8 to which an anode voltage is applied.
Terminal 23 is welded to intermediate grid electrode 2 and
4 is connected to the ground electrode of the electron gun.

That is, a connection piece 22 a is attached to the terminal 22, and this connection piece 22 a is welded to the side surface of the shield cup 8.

A connecting piece 23a is pulled out from the terminal 23 and welded to the intermediate grid electrode 2, and a high voltage obtained by dividing the anode voltage by a resistance ratio is supplied to the intermediate electrode 2.

From the terminal 24, a metal piece 1 embedded in the insulating support rod 9 via a connecting piece 24a and a connecting piece 24c.
Connect to 7. The metal piece 17 is connected to one of the stem pins 45, and is connected to a potential (ground potential) such as ground outside the cathode ray tube through the stem pin 45.

FIG. 8 is a perspective view illustrating the structure of the terminal portion of the built-in resistor, and FIG. 9 is a partial view illustrating the structure of the terminal portion.

The built-in resistor 12 is formed by pattern-printing a resistive material (metal oxide such as ruthenium oxide) having a predetermined resistance pattern on an insulating substrate 18 preferably made of ceramic, dried and fired. A body layer 19 is formed.

An insulating film layer 21 made of glass (for example, lead borosilicate glass) is formed so as to cover the pattern of the resistor layer 19 (resistor pattern). Also,
A similar insulating film layer is formed on the back surface of the insulating plate 18.

A terminal 22 at one end of the built-in resistor 12 is connected to a shield cup 8 fixed to the sixth grid electrode 1 by a connection piece 22a, and a terminal 24 at the other end is connected to an electrode piece at ground potential by a connection piece 24a. Terminal 23 connected and provided in the middle
Are connected to the intermediate electrode 2 by connecting pieces 23a.

The connection pieces 22a, 23a and 24a are
Terminal connection conductive films 22b and 2 connected to the resistor layer 19
The terminals 22, 23, and 24 made of metallic eyelets fixed by caulking to 3 b and 24 b respectively are integrally formed.

FIGS. 10A and 10B are explanatory views of the configuration of the metallic eyelets constituting the terminals, wherein FIG. 10A is a plan view as seen from the dish-like flange side, and FIG. 10B is a side view.

This metallic eyelet is composed of a cylindrical portion 22B planted in the center of a concave portion of a dish-like flange portion 22A having a connection piece integrally formed on the outer edge. And, the flange portion 22
A connection piece 22a is integrally formed on the edge of A, and the metal eyelets constituting the terminal 22 are, as shown in FIG.
The cylindrical portion 22B is connected to the insulating substrate 18 and the conductive film 2 for terminal connection.
It is inserted into a through hole 18a penetrating through 2b, and pressed from above and below with a caulking jig (not shown) to be caulked. Terminals 23, 24
The same is true for

The caulking is performed by placing the flange portion 22 on the caulking table.
A is placed on the cylindrical portion 22A protruding from the insulating substrate and a punch is applied to apply a load.

A color cathode ray tube having a built-in resistor of this kind is disclosed in, for example,
38484 can be mentioned.

[0024]

Generally, the metallic eyelets constituting the terminals are formed of a hard metal such as stainless steel. Therefore, when the insulating substrate is swaged, the flange portion does not become flat, and the distal end portion is not flattened. There was a problem that only a part of the conductive film could not be brought into contact with the terminal connection conductive film, the bonding strength was reduced, and the electrical connection was unstable.

As a countermeasure, it is conceivable to increase the load at the time of caulking. However, if the caulking load is large, the edge of the opening of the through hole of the insulating substrate may be damaged.

Conventionally, heat treatment is performed to soften the eyelets made of metal. However, after crimping, the flange portion becomes flat and the contact with the conductive film for terminal connection becomes good, but the operating temperature of the cathode ray tube is reduced. Due to the change, the contact between the insulating substrate and the insulating substrate is deteriorated due to the difference in thermal expansion, which causes a connection failure and a supply failure of the focus voltage.

It is an object of the present invention to provide a color cathode ray tube including an electron gun having a built-in resistor having a stable and good voltage supply function by solving the above-mentioned problems of the prior art.

[0028]

In order to achieve the above object, the present invention is characterized in that a slit is provided in a flange portion of a metal eyelet constituting a terminal of a built-in resistor.

According to this configuration, heat treatment is unnecessary, the caulking load on the flange portion of the metal eyelet is reduced, the loss of the opening edge of the through hole of the insulating substrate is prevented, and the contact with the conductive film for terminal connection is improved. . And the difference in thermal expansion with the insulating substrate due to the temperature change is absorbed by the concave portion of the flange portion,
The electrical connectivity is improved, the supply of a stable focus voltage is maintained, and a highly reliable color cathode ray tube is obtained.

A typical configuration of the present invention is described as follows. That is, (1) an electron beam generator, a focusing accelerator for focusing and accelerating the electron beam toward the phosphor screen, and a plurality of electrodes forming the electron beam generator and the focusing accelerator are arranged in a predetermined order and at intervals. And a color cathode ray tube containing an electron gun having a built-in resistor attached to the insulating support rod for supplying required voltages having different potential differences to a plurality of electrodes constituting the focusing accelerator. The built-in resistor,
A resistor pattern formed on the surface of the insulating plate, a terminal connection conductive film formed at both ends and an intermediate portion of the resistor pattern, and a connection piece integrally formed on an outer edge and one or more slits formed on a peripheral edge. A metal eyelet constituted by a cylindrical portion planted at the center of the concave portion of the dish-shaped flange portion is provided as an external lead terminal, and the metal-made eyelet is provided in a through hole provided so as to penetrate the terminal connecting conductive film and the insulating plate. The metal eyelet flange and the terminal-connecting conductive film were brought into surface contact by swaging by inserting the eyelet cylindrical portion.

It should be noted that the present invention is not limited to the above configuration, and various changes can be made without departing from the technical idea of the present invention, and a color cathode ray provided with an electron gun for emitting a plurality of electron beams. The present invention can be similarly applied to not only a tube but also various kinds of cathode ray tubes which emit a single electron beam, for example, a projection type cathode ray tube, and other types of cathode ray tubes provided with an electron gun having a built-in resistor.

[0032]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a metal eyelet 1 constituting a terminal of a built-in resistor provided in an electron gun of a color cathode ray tube according to the present invention.
It is explanatory drawing of an example, (a) is a top view seen from the flange part side, (b) shows a side view.

The metallic eyelets constituting the terminal 22 are formed by a dish-shaped flange portion 22 having a connection piece 22a integrally formed on the outer edge.
It is composed of a cylindrical portion 22B planted in the center of the concave portion of A. A plurality of slits 22 are provided on the periphery of the flange portion 22A.
c is formed, and a connection piece 22a is integrally formed at a part of the edge. This slit 22c is
It is formed at a position symmetrical to the central axis in the longitudinal direction of a.

The cylindrical portion 2B of this metallic eyelet is inserted into the insulating substrate of the built-in resistor and the through hole of the conductive film for terminal connection in the same manner as described with reference to FIG. 9, and is caulked by a caulking jig.

At the time of this caulking, the presence of the slit 22c does not increase the caulking load but increases the flange portion 22A.
Sufficient contact is obtained between the terminal and the conductive film for terminal connection.

Therefore, a highly reliable color cathode ray tube can be obtained by using an electron gun having a built-in resistor having this terminal configuration.

FIG. 2 is an explanatory view of another example of a metal eyelet constituting a terminal of a built-in resistor provided in an electron gun of a color cathode ray tube according to the present invention. FIG. 2 (a) is a plan view seen from a flange portion side. (B) shows a side view.

The metallic eyelet constituting the terminal 22 is formed of a cylindrical portion 22B planted at the center of a concave portion of a dish-like flange portion 22A having a connection piece integrally formed on the outer edge, similarly to the above embodiment. . A plurality of slits 22c are formed on the peripheral edge of the flange portion 22A, and a connection piece 22a is integrally formed on a part of the edge.

In this configuration example, the slit 22c is formed at a position symmetrical with respect to the longitudinal center axis of the connecting piece 22a. This takes into account the efficiency of press punching in the production of metallic eyelets.

By using an electron gun having a built-in resistor having this terminal configuration, a highly reliable color cathode ray tube can be obtained.

Slit 22 formed in flange portion 22A
The position of c is not particularly limited. The number of the slits 22c may be at least one, but is preferably three as in the embodiment, from the viewpoint of the load balance at the time of caulking and the connection strength.

FIG. 3 is an explanatory view of the caulking step of the metallic eyelets constituting the terminal. In the figure, reference numeral 30 denotes a caulking stand, on which an axis 31 for inserting the cylindrical portion 22B of a metal eyelet is planted.

During the caulking operation, as shown in FIG. 3A, a through hole formed in the insulating substrate 18 of the built-in resistor is
The cylindrical portion 22 is formed so that the metal eyelet flange portion 22A constituting the terminal 22 is in contact with the terminal connection conductive film 22b.
Insert B. At this time, the tip of the cylindrical portion 22B is formed to have a size slightly protruding from the insulating substrate 18.

Next, as shown in FIG. 3B, a punch is applied to the flange portion 22B protruding from the insulating substrate 18, and a load is applied to bend the edge of the cylindrical portion to caulk.

In the caulking step, since a slit is formed in the flange portion of the metal eyelet, the same caulking can be obtained even if the load for caulking is smaller than the conventional one, and the flange portion 22A and the conductive material for terminal connection are obtained. The film 22b is connected in a surface contact state.

FIG. 4 is an explanatory view comparing the relationship between the displacement of the flange portion of the insulating substrate and the metal eyelet due to the caulking load and the change in temperature between the prior art and the embodiment of the present invention. In the figure,
(A) is a conventional case without a slit and no heat treatment, (B) is an embodiment of the present invention with a slit and no heat treatment,
(C) shows the characteristics of conventional metal eyelets without slits and heat treatment.

As shown in the characteristic curve of FIG. 10, when the required amount of deflection upon caulking is 0.1 mm, the required load required for caulking in the embodiment of the present invention is 7.0 kgf.
(B) is about 15% smaller than 8.2 kgf in the conventional example and is in the elastic range. Therefore, the positional deviation due to the temperature change is elastically absorbed, and the electrical contact is maintained.

On the other hand, in the conventional heat-treated (C), the required load is 4.4 kgf, which is about 4 kgf higher than that of the embodiment of the present invention.
Although it is sufficient to reduce the displacement by 6%, since this positional deviation results in plastic deformation, the difference in thermal expansion between the color cathode ray tube and the insulating substrate due to the operating temperature cannot be absorbed. In (A), although the flange portion is in the elastic region, the caulking load is large, and the opening edge of the through hole of the insulating substrate is damaged, and sufficient surface contact between the flange portion and the terminal connecting conductive film of the insulating substrate is obtained. Difficult to get.

As described above, according to the embodiment of the present invention, the heat treatment of the metal eyelets is unnecessary, and the surface contact between the flange portion and the insulating substrate can be established by the crimping operation with a smaller load.

Therefore, stable electrical contact is ensured for a long period of time, a divided voltage can be reliably supplied to the focus electrode, and a highly reliable color cathode ray tube can be provided.

FIG. 5 is a plan view for explaining an example of the actual shape of the built-in resistor used in the color cathode ray tube according to the present invention. The terminals 22, 23, and 24 of the built-in resistor 12 have the above-described metal eyelet caulking structure, and are connected to the shield cup 8, the intermediate electrode 2, and the metal piece 17 connected to the ground in FIG.

The resistor pattern 19 has a bent and folded pattern as shown in the figure in order to set a divided resistance for obtaining a required voltage value on a limited plane of the insulating substrate 18.

By using this built-in resistor 12,
The electrical connectivity is improved, the supply of a stable focus voltage is maintained, and a highly reliable color cathode ray tube is obtained.

[0055]

As described above, according to the present invention in which the slit of the flange portion of the metal eyelet constituting the terminal of the built-in resistor is provided, a sufficient surface with the conductive film for terminal connection can be obtained with a small caulking load. Because contact is obtained, and positional deviation due to changes in operating temperature is reduced, and electrical connectivity is improved,
A stable supply of the focus voltage is maintained for a long time, and a highly reliable color cathode ray tube can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an example of a metal eyelet constituting a terminal of a built-in resistor provided in an electron gun of a color cathode ray tube according to the present invention.

FIG. 2 is an explanatory view of another example of a metal eyelet constituting a terminal of a built-in resistor provided in an electron gun of a color cathode ray tube according to the present invention.

FIG. 3 is an explanatory view of a caulking step of a metallic eyelet constituting a terminal.

FIG. 4 is an explanatory diagram comparing the relationship between the displacement amount of the flange portion of the insulating substrate and the metal eyelet due to the caulking load and the temperature change, comparing the prior art and the embodiment of the present invention.

FIG. 5 is a plan view illustrating an example of an actual shape of a built-in resistor used in a color cathode ray tube according to the present invention.

FIG. 6 is a side view of a main part of a color cathode ray tube accommodating an in-line type electron gun having a built-in resistor.

FIG. 7 is a side view of the electron gun in FIG. 6 as viewed from an in-line direction.

FIG. 8 is a perspective view illustrating a configuration of a terminal portion of a built-in resistor.

FIG. 9 is a partial view illustrating a configuration of a terminal unit.

FIG. 10 is an explanatory diagram of a configuration of a metal eyelet forming a terminal.

[Explanation of symbols]

 12 Built-in resistor 18 Insulating substrate 19 Resistor pattern 21a, 21b Insulating coating layer 22c Slit 22, 23, 24 External lead-out terminal (metal eyelet) 22A Flange part 22B Cylindrical part 22a, 23a, 24a Connection piece 22b, 23b, 24b Conductive film for terminal connection.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Satoru Miyamoto 3300 Hayano, Mobara-shi, Chiba F-term (Reference) 5C041 AA03 AB14 AC14 in Electronic Device Division, Hitachi, Ltd.

Claims (1)

[Claims] An electron beam generator, a focusing accelerator for focusing and accelerating an electron beam toward a phosphor screen, and a plurality of electrodes forming the electron beam generator and the focusing accelerator are arranged in a predetermined order and at a predetermined interval. And a color cathode ray tube containing an electron gun having a built-in resistor attached to the insulating support rod for supplying required voltages having different potential differences to a plurality of electrodes constituting the focusing accelerator. The built-in resistor is formed integrally with a resistor pattern formed on the surface of the insulating plate, a terminal connection conductive film formed on both ends and an intermediate portion of the resistor pattern, and a connection piece formed on an outer edge. A metal eyelet composed of a cylindrical portion planted in the center of a concave portion of a dish-shaped flange portion having one or a plurality of slits on its periphery is provided as an external lead-out terminal, and penetrates the conductive film for terminal connection and the insulating plate. By caulking by inserting the cylindrical portion of the metal eyelet to Kita hole, a color cathode ray tube characterized by comprising a flange portion and the terminal connecting conductive film of the metal eyelet by surface contact.