JP2000195445A - Cathode-ray tube and its stem base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid formation of a V-shaped groove to be a cause of a crack, between a nib formed on the base part of a stem pin of a stem and a neck part inner wall, in fusing the stem on the end part of a neck part, by forming a stem pin standing base part on the opposite part to the neck part side of the stem, namely, a stem pin standing face inside a vacuum envelope, as a flat face. SOLUTION: A stem part of a cathode-ray tube is composed of a stem pin 14, a stem 17 and an exhaust pipe 18. A stem pin standing base part on the opposite face to a neck part of the stem 17 is flat, and a nib is not formed. By applying this structure, the incidence of a V-shaped groove can be avoided on the fusion part with the neck part, even if the inner diameter of the neck part is reduced to some extent, and the difference between the diameter of a pin circle and the inner diameter of the neck part can be reduced, therefore the outer diameter of the neck part can be reduced, too. Also, even if an electron gun having many stem pins is sealed in a cathode-ray tube having a small size neck part diameter, a crack is not generated on the stem fusing part, to thereby improve reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cathode ray tube,
In particular, the present invention relates to a cathode ray tube having a neck portion formed by fusing a plurality of stem pins and having an annularly implanted stem, and a stem base for protecting a stem pin implanted outside the stem.

[0002]

2. Description of the Related Art In general, a color cathode ray tube known as a cathode ray tube which emits a plurality of electron beams has a phosphor screen (screen) having a phosphor applied on an inner surface thereof and a shadow mask suspended close to the phosphor screen. A vacuum envelope having a panel portion and a neck portion connected by a funnel-shaped funnel portion having a diameter gradually reduced from the panel portion, and holding the electron gun housed in the neck portion and holding the open end of the neck portion. A closed vessel (vacuum envelope) is constituted by a stem fused to a neck edge (hereinafter, also referred to as a neck edge).

[0003] The stem holds electrodes of an electron gun housed in a neck portion and a plurality of stem pins for introducing various signal voltages from an external circuit are annularly penetrated and implanted.

[0004] A deflection yoke is provided in the transition region between the funnel portion and the neck portion, and deflects a plurality of electron beams emitted from the electron gun after being modulated by an image signal in two directions, horizontal and vertical. Play a visible image on the phosphor screen.

FIG. 15 is a schematic cross-sectional view for explaining a schematic structure of a color cathode ray tube as an example of a cathode ray tube to which the present invention is applied, wherein 14 is a stem pin, 15 is a stem base,
17 is a stem, 20 is a panel part, 21 is a neck part, 22
Is a funnel portion, 23 is a phosphor screen (also called a screen or a screen), 24 is a shadow mask, 25 is a mask frame, 26 is a magnetic shield, 27 is a shadow mask suspension mechanism, 28 is an electron gun, 29 is a deflection yoke, 30 Is an external magnetic device, 31 is a contact spring, 32 is a funnel getter, and 33 is an explosion-proof band.

As described above, this type of color cathode ray tube has a panel section 20, a neck section 21, and a panel section 20.
A vacuum envelope, that is, a vacuum container is formed from the funnel portion 22 connecting the neck portion 21 and the funnel portion 22.

The inner surface of the panel section 20 has a screen on which a phosphor screen 23 coated with phosphors of three colors is formed.
An electron gun 28 for emitting three electron beams in-line is accommodated in the inside 1, and a shadow mask 24 having a large number of apertures or an interdigital etching shape near the phosphor screen 23 of the panel section 20. Is arranged.

The funnel 22 and the neck 21
A deflection yoke 29 is provided in the transition region.

The stem 17 sealed to the neck for accommodating the electron gun 28 holds each electrode of the electron gun,
A plurality of stem pins 14 for introducing various signal voltages from an external circuit are annularly penetrated and planted, and are formed of an insulating material such as a resin material having a pin hole into which the plurality of stem pins 14 are fitted. A stem base 15 is provided to protect the stem pin 14.

An inner conductive film (not shown) is applied to the inner surface of the funnel portion 22.
The contact spring 31 provided at 8 elastically contacts and supplies a high voltage to the electron gun.

A funnel getter 32 accommodating a getter material is attached to the mask frame 25, and the getter material is heated from the outside to evaporate, thereby increasing the degree of vacuum inside the vacuum envelope.

An image signal and a focus signal from the drive circuit are supplied to a stem base fitted into the stem pin 14 through a socket (not shown).

The three electron beams (Bc, Bs × 2) emitted from the electron gun after being modulated by image signals are supplied to the deflection yoke 2.
The light is deflected in two directions, horizontal and vertical, by the horizontal and vertical deflecting magnetic fields generated in 9, and receives color selection at the aperture of the shadow mask 24 and collides with each phosphor to form a color image.

FIG. 16 is an explanatory view of a fusing operation for sealing the stem to the neck portion. The stem 17 has a substantially disk-shaped surface with a flat or U-shaped cross section facing the open end of the neck portion 21, and an exhaust pipe 18 extends at the center thereof.

A plurality of stem pins 14 are annularly penetrated between the exhaust pipe and the outer periphery of the stem 17, and are provided on the inner surface, that is, at the base of the stem pin inside the vacuum vessel, for maintaining the mechanical strength of the stem pin. A raised portion called a dowel (hereinafter, referred to as a dowel 11) is formed.

After the electron gun 28 is attached to the stem pin 14 to be located in the neck portion and necessary wiring is performed, the electron gun 28 is inserted into the neck portion 21 as shown by the arrow, and the two are brought into contact with each other. The part is fused and shaped by heating from the outer periphery with a burner or the like.

After the stem 17 is fused, exhaust is performed through the exhaust pipe 18 and the getter is heated to obtain a required degree of vacuum.

[0018]

FIG. 17 is a sectional view of an essential part for explaining a fused portion between a neck portion and a stem of a conventional cathode ray tube. FIG. 18 is a sectional view of an essential part for explaining the configuration of only the stem portion in FIG.

As described above, the end portion of the neck portion 21 and the peripheral portion of the stem 17 are in contact with each other at the end portion of the neck portion 21 in contact with the outer peripheral upper surface of the stem 17 (the side opposite to the exhaust pipe 18). In a state, it is heated by a burner or the like.

In recent cathode ray tubes, the number of stem pins 14 implanted on the stem 17 has been increased for the purpose of improving and maintaining the focus characteristics, so that the diameter of the annular arrangement of stem pins (referred to as a pin circle) has been increased. Cannot be reduced below a certain level.

Therefore, in a so-called dynamic focus type electron gun, the number of stem pins arranged in a ring is increased, and the reduction of the diameter of the pin circle is limited.
A V-shaped groove as shown by an arrow A is formed in the gap between 1 and the inner wall of the neck portion 21.

When such a V-shaped groove is formed, stress tends to concentrate on that portion, resulting in a problem that mechanical strength is reduced and cracks occur.

In particular, in a dynamic focus type electron gun in which the number of stem pins 14 arranged in a ring is large, the reduction of the pin circle is limited, and the dowel 11 and the neck 21
And the V-shaped groove is easily generated.

On the other hand, regarding the outer diameter of the neck portion 21, it is necessary to minimize the outer diameter of the neck portion where the deflection yoke is mounted in order to save power of the cathode ray tube.

In the case where the deflection yoke is inserted from the end of the neck after the stem is sealed, for example, the stem pin 14 is annularly penetrated by a pin circle having a diameter of 15.24 mm, and the focus adjustment voltage is applied. In a stem provided with two high-pressure stem pins for applying a pressure, a stem base provided with a pin hole inserted into the stem pin after sealing the vacuum envelope is installed.

Therefore, the maximum diameter of the portion through which the deflection yoke passes cannot be made smaller than 24.3 mm in consideration of the limitation on the thickness of the glass tube at the neck.

The stem base has a pin hole for the high pressure stem pin and a pin hole for the high pressure stem pin so as to surround the pin hole for the high pressure stem pin so as to isolate the pin hole for the high pressure stem pin. A shield-shaped protrusion along the extension surface is formed.

FIGS. 19A and 19B are explanatory views of a conventional stem base. FIG. 19A is a top view, FIG. 19B is a side view as viewed from the direction of arrow B in FIG. FIG. 3 shows a side view as seen from the direction.

The stem base 15 has a substrate portion 40 having a pin hole 42 for a high-pressure stem pin and a pin hole 43 for another stem pin, and a boss portion 4 for receiving a cut-off portion of an exhaust pipe.
1 and a shield-like projection 44 formed around the pin hole 42 for the high-pressure stem pin.

As shown in the figure, the shield projection 44 is provided with a pin hole 4 for a high-pressure stem pin (that is, a focus pin).
2 is isolated from other adjacent pins so that no discharge or contact occurs between them.

When the stem base is installed on the stem of the cathode ray tube, the shield projection 44 having such a shape has a shape along the extension surface of the neck outer diameter. It was also one of the causes of limiting the reduction of the maximum diameter of the portion through which the gas passes.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a space between a dowel formed at the base of a stem pin of the stem and an inner wall of the neck when the stem is fused to an end of the neck. Another object of the present invention is to provide a cathode ray tube and a stem base thereof, which avoid the formation of a V-shaped groove that causes cracks and can save power.

[0033]

The above object is achieved by making the stem pin planting base at the portion of the stem facing the neck portion side, that is, the flat surface of the stem pin planting surface inside the vacuum envelope. You.

Further, the present invention is attained by eliminating the shape of the shield-like projection formed on the stem base along the extended surface of the neck outer diameter.

Typical configurations of the present invention are as follows. That is, (1) a neck in which a panel portion having a fluorescent film on the inner surface and a stem that is annularly planted through one of a plurality of stem pins for holding an electron gun and for introducing a required signal voltage is fused to one end. And a substantially funnel-shaped funnel portion connecting the other end of the neck portion and the panel portion to form a vacuum envelope, wherein stem pins of the stem are erected inside the vacuum envelope. The surface is a flat surface.

Since there is no dowel in the stem pin erected surface inside the vacuum envelope of the stem, that is, in the stem fusion portion at the neck, the diameter of the pin circle of the stem and the clearance between the stem pin and the inner wall of the neck. The size is increased, and the occurrence of a V-shaped groove in the fused portion can be avoided, and the inner diameter of the neck portion can be reduced by making the inner diameter of the neck portion closer to the diameter of the pin circle.

(2) In the above (1), a dowel is formed so as to surround each of the stem pins on the stem pin setting base on the stem pin setting surface side of the stem outside the vacuum envelope. It is characterized by.

By forming the dowels, the mechanical strength of the stem pins can be increased as in the case of the conventional dowels formed in the stem pin planting base inside the neck portion.

(3) a panel having a fluorescent film on the inner surface;
A neck portion in which a plurality of stem pins for holding an electron gun and for introducing a required signal voltage are penetrated and an annularly erected stem is fused at one end, and between the other end of the neck portion and the panel portion. A stem base having a plurality of pin holes arranged so as to be fitted to each of the stem pins of a cathode ray tube which constitutes a vacuum envelope with a substantially funnel-shaped funnel portion connecting the pin holes. Between the high-voltage pin hole into which the high-voltage pin for applying the voltage for focus adjustment is fitted and another pin hole adjacent to the high-voltage pin hole, the high-pressure stem pin fitted into the high-voltage pin hole and another pin hole And a shield-like wall member for isolating only between the other stem pins fitted in the fin.

(4) A plurality of high pressure stem pins in (3), wherein the shield wall member is provided between each of the high pressure stem pins and another stem pin adjacent to these high pressure stem pins. .

With this configuration, the outer diameter of the stem base can be reduced, for example, the diameter of the pin circle is 15.24 mm.
Therefore, even when two high-pressure stem pins for focus adjustment are provided, the maximum outer diameter of the portion through which the deflection yoke passes is set to 24.
It becomes possible to make it smaller than 3 mm.

The present invention is not limited to the above configuration and the configuration of the embodiment described later, and various modifications can be made without departing from the technical idea of the present invention.

[0043]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the illustrated embodiments.

FIG. 1 is a sectional view of a main portion of a stem portion of a cathode ray tube for explaining the structure of a first embodiment of a cathode ray tube according to the present invention. Similar to FIG. 17, 14 indicates a stem pin, 17 indicates a stem, and 18 indicates an exhaust pipe.

As shown in the figure, the stem pin planting base on the surface of the stem 17 facing the neck is flat, and does not have a dowel as in the prior art. With this structure,
Even if the inner diameter of the neck portion is reduced to some extent, the occurrence of a V-shaped groove in the fusion portion with the neck portion is avoided, and the difference between the diameter of the pin circle and the inner diameter of the neck portion can be reduced, and the outer diameter of the neck portion can also be reduced. .

FIG. 2 is a sectional view of a main part of a stem portion of a cathode ray tube for explaining the structure of a cathode ray tube according to a second embodiment of the present invention. The same reference numerals as those in FIG. 1 correspond to the same parts.

In this embodiment, the stem 17 has a substantially U-shaped cross section having a protruding portion 17 ′ protruding toward the end face of the neck portion on the outer edge of the stem 17. The stem pin planting base on the surface of the stem 17 facing the neck is flat as in the first embodiment.
No dowels as in the prior art are formed. Even with this structure, the occurrence of a V-shaped groove in the fusion portion with the neck portion is avoided, and the inner diameter of the neck portion can be made closer to the diameter of the pin circle, so that the outer diameter of the neck portion can be reduced.

FIG. 3 is a sectional view of a main part of a stem portion of a cathode ray tube for explaining a configuration of a third embodiment of the cathode ray tube according to the present invention. The same reference numerals as those in FIG. 1 correspond to the same parts.

In this embodiment, as in the first embodiment, the stem pin planting base on the surface of the stem 17 facing the neck is flat, and the dowel is not formed unlike the prior art.
A dowel is formed on a stem pin planting base on the stem pin planting surface outside the vacuum envelope of No. 7 so as to surround each of the stem pins.

With this structure, the occurrence of a V-shaped groove in the fused portion with the neck portion is avoided, and the difference between the diameter of the pin circle and the inner diameter of the neck portion can be reduced, so that the outer diameter of the neck portion can also be reduced. At the same time, the mechanical strength of the stem pin can be improved.

FIG. 4 is a sectional view of a main part of a stem portion of a cathode ray tube for explaining the structure of a cathode ray tube according to a fourth embodiment of the present invention. The same reference numerals as those in FIG. 2 correspond to the same parts.

In this embodiment, similarly to the second embodiment, the protruding portion 1 protruding toward the end face of the neck portion is provided on the outer edge of the stem 17.
7 ′ and a stem 17
A dowel is formed on a stem pin planting base on the stem pin planting surface side outside the vacuum envelope of the above-mentioned vacuum envelope so as to surround each of the stem pins.

According to this structure as well, the occurrence of a V-shaped groove in the fusion portion with the neck portion can be avoided, and the inner diameter of the neck portion can be made closer to the diameter of the pin circle. Can be improved in mechanical strength.

FIG. 5 is a sectional view of a principal part for explaining a first structural example of a neck portion of a cathode ray tube and a fused portion of the stem constituted by using the stem shown in FIG. 1 or FIG. As illustrated, even if the inner diameter of the neck portion is reduced to some extent, the inner surface and the outer surface along the axial direction of the neck portion 21 can both have a straight shape.

As described above, by forming the stem fusion portion of the neck portion and the main portion on the funnel side into a straight shape, the deflection yoke can be easily inserted.

FIG. 6 is a cross-sectional view of a principal part for explaining a second structural example of the neck portion of the cathode ray tube and the fused portion of the stem constituted by using the stem shown in FIG. 1 or FIG. In this structural example, the inner and outer diameters of the main portion (funnel side) 21a of the neck portion 21 are made smaller than those of the vicinity 21b of the fusion portion of the stem 17, and the stem 17 and the neck portion 21 are maintained while maintaining the power saving effect. The tolerance of the fused portion with the edge of the above is increased.

With this structure, the neck 21
V-shaped grooves can be further prevented from being formed at the fused portion between the shaft and the stem 17.

The thickness of the main part 21a of the neck part 21 and the vicinity 21b of the fused part may be a constant thickness as shown (the inner and outer diameter difference is constant) or may be gradually changed from the main part 21a to the fused part (FIG. (Thin).

FIG. 7 is a sectional view of a principal part for explaining a third structural example of the neck portion of the cathode ray tube and the fused portion of the stem constituted by using the stem shown in FIG. 1 or FIG. In this structural example, the main portion 21a of the neck portion 21 and the vicinity 2
The inner and outer diameters in the middle of 1b are slightly increased, and the inner and outer diameters of the fused portion are reduced as in the main portion 21a.

With this structure, the stem 1
The margin of the fusion portion between the neck 7 and the edge of the neck portion 21 is increased, and the formation of a V-shaped groove in the fusion portion between the neck portion 21 and the stem 17 can be further prevented.

The thickness of the main portion 21a and the fusion portion 21b of the neck portion 21 may be constant as shown, or may gradually change from the main portion 21a to the large diameter portion, or from the large diameter portion to the fusion portion 21b. (Gradually thin or gradually thick).

FIG. 8 is a cross-sectional view of a principal part for explaining a fourth structural example of the neck portion of the cathode ray tube and the fused portion of the stem constituted by using the stem shown in FIG. 1 or FIG. In this structural example, the outer surface of the neck 21 along the axial direction is the stem 17.
And a straight shape is formed over the fused portion, and the inner diameter in the vicinity 21b of the fused portion is smaller than that of the main portion 21a.

As described above, since the inner diameter of the stem fused portion of the neck portion is made larger than the inner diameter of the main portion by reducing the thickness of the neck portion glass, the power saving effect is maintained while the power saving effect is maintained. The occurrence of a V-shaped groove in the fusion portion with the pin portion is avoided, the difference between the diameter of the pin circle and the outer diameter of the neck portion can be reduced, and the insertion of the deflection yoke is facilitated.

FIG. 9 is a sectional view of a principal part for explaining a fifth structural example of the neck portion of the cathode ray tube and the fusion portion of the stem constituted by using the stem shown in FIG. 1 or FIG. In this structural example, the outer surface of the neck 21 along the axial direction is the stem 17.
Is formed in a straight shape over the fused portion, and the inner diameter in the vicinity 21b of the fused portion is gradually reduced to halfway from the main portion 21a.

As described above, the inner diameter of the stem fused portion of the neck portion is made larger than the inner diameter of the main portion by changing the thickness of the neck portion glass. The occurrence of a V-shaped groove in the fused portion with the above is avoided, the outer diameter of the neck portion can be made closer to the diameter of the pin circle, and the deflection yoke can be easily inserted.

Although the edges of the neck portion 21 in each of the above structural examples have a straight shape, the present invention is not limited to this. The present invention can be similarly applied to a case where the edge has a flared shape.

In each of the above structural examples, the stem 17
The outer peripheral edge of the stem 17 is shown as being in contact with the edge of the neck portion 21 in the axial direction of the neck portion. However, the present invention is not limited to this, and the outer peripheral edge of the stem 17 is included in the edge of the neck portion 21. May be.

Further, even if the stem shown in FIG. 3 or FIG. 4 is used as the stem in FIG. 5 to FIG. 9, it is possible to avoid the formation of the V-shaped groove of the fused portion or to obtain the power saving effect. it can.

FIGS. 10A and 10B are explanatory views of a first embodiment of a stem base applied to a cathode ray tube according to the present invention, wherein FIG. 10A is a top view and FIG. 10B is a side view as viewed from the direction of arrow B in FIG. Figure,
(C) shows the side view seen from the arrow C direction of (a).

The stem base 15 includes a base 40 having two pin holes 42 for high-pressure stem pins for focus adjustment and a pin hole 43 for other stem pins, a boss 41 for receiving a cut-off portion of an exhaust pipe, and a high-pressure stem. It is composed of two plate-shaped shield-shaped wall members 45a and 45b provided between a pin hole 42 for a stem pin and another pin hole 43, and is an extension of the conventional neck portion outer diameter shown in FIG. The shape along the surface is missing.

The shield-like wall members 45a and 45b separate the two pin holes 42 for the high-pressure stem pins from other pin holes 43 adjacent thereto so that no discharge or contact occurs between them. The conventional shape shown in FIG. 18 along the extension surface of the neck outer diameter may be formed on the socket side (not shown).

The shield-shaped wall members 45a and 45 having such shapes
b, when the stem base 15 is fixed to the stem of the cathode ray tube with an adhesive, the shield-shaped wall members 45a and 45b
Since 5b is located inside from the extension surface of the neck outer diameter, the reduction of the maximum diameter of the portion through which the deflection yoke passes is not limited.

FIGS. 11A and 11B are explanatory views of a second embodiment of the stem base applied to the cathode ray tube according to the present invention, wherein FIG. 11A is a top view, and FIG. 11B is a side view as viewed from the direction of arrow B in FIG. Figure,
(C) shows the side view seen from the arrow C direction of (a).

The stem base 15 is composed of a substrate portion 40 having two pin holes 42 for high-pressure stem pins for focus adjustment and another pin hole 43 for stem pins, and a boss portion 41 for receiving a cut-off portion of an exhaust pipe. Be composed. That is, the structure does not include the shield-like wall member shown in FIG.

When the stem base 15 having such a shape is fixed to the stem of the cathode ray tube with an adhesive, it is possible to reduce the maximum diameter of a portion through which the deflection yoke passes. If electrical isolation between the high-pressure stem pin 42 and another stem pin is required, an appropriate wall member may be formed on the socket (not shown).

FIGS. 12A and 12B are explanatory views of a third embodiment of a stem base applied to a cathode ray tube according to the present invention, wherein FIG. 12A is a top view, and FIG. 12B is a side view as viewed from the direction of arrow B in FIG. Figure,
(C) shows the side view seen from the arrow C direction of (a).

The stem base 15 has a base portion 40 having two pin holes 42 for high-pressure stem pins for focus adjustment and a pin hole 43 for other stem pins, a boss portion 41 for receiving a cut-off portion of an exhaust pipe, and a high-pressure portion. It is composed of a plate-shaped shield-shaped wall member 45a provided between one of the pin holes 42 for the stem pin and the other pin hole 43.

The shield wall member 45a isolates one pin hole 42 for the high-pressure stem pin from another pin hole 43 adjacent thereto so that no discharge or contact occurs between them.

With this configuration, in addition to the effects of the above embodiment,
The penetration between the stem pin and the socket is improved, and the mechanical load on the stem pin can be reduced.

When electrical isolation is required between the other high-pressure stem pin and another adjacent stem pin, an appropriate wall member may be formed on the socket (not shown).

FIGS. 13A and 13B are explanatory views of a fourth embodiment of the stem base applied to the cathode ray tube according to the present invention, wherein FIG. 13A is a top view, and FIG. 13B is a side view as viewed from the direction of arrow B in FIG. Figure,
(C) shows the side view seen from the arrow C direction of (a).

The stem base 15 has a base portion 40 having two pin holes 42 for high-pressure stem pins for focus adjustment and a pin hole 43 for other stem pins, a boss portion 41 for receiving a cut-off portion of an exhaust pipe, and a high-pressure portion. It is composed of a plate-shaped shield wall member 45b provided between one of the pin holes 42 for the stem pin and the other pin hole 43.

The shield-shaped wall member 45b is isolated from the other pin hole 43 adjacent to the other one of the two pin holes 42 for the two high-pressure stem pins so as to prevent discharge or contact between them. Is what you do.

With this configuration, the same effects as in the embodiment shown in FIG. 12 can be obtained. When it is necessary to electrically isolate one high-pressure stem pin of FIG. 12 from another stem pin adjacent to the high-pressure stem pin, an appropriate wall member may be formed on a socket (not shown) in FIG. Same as the example.

FIGS. 14A and 14B are explanatory views of a fifth embodiment of the stem base applied to the cathode ray tube according to the present invention, wherein FIG. 14A is a top view, and FIG. 14B is a side view as viewed from the direction of arrow B in FIG. Figure,
(C) shows the side view seen from the arrow C direction of (a).

The stem base 15 has a substrate portion 40 in which two pin holes 42 for high-pressure stem pins for focus adjustment and a pin hole 43 for other stem pins are formed, and a boss portion 41 for receiving a sealing cut portion of an exhaust pipe. And two shield-shaped wall members 45c and 45d formed between the pin hole 42 for the high-pressure stem pin and the other pin hole 43, and have a conventional neck outer diameter shown in FIG. The shape along the extension surface is missing.

The two shield-shaped wall members 45c and 45d are different from the shield-shaped wall members 45a and 45b shown in FIGS.
5 does not extend to the outer peripheral edge of the substrate portion 40, but forms an amount of wall necessary for withstand pressure between the high-pressure stem pin and the low-pressure stem pin in the outer peripheral edge.

Note that these two shield-like wall members 45c and 45d may be formed on either one as shown in FIGS.

According to this structure, FIGS.
The same effect as that of the embodiment shown in FIG.

According to each of the embodiments of the present invention, even when a stem in which a stem pin is erected with a pin circle diameter of the same size as the conventional one is used, power consumption can be further reduced as compared with the conventional one.

The present invention is not limited to the panel-shaped cathode ray tube shown in FIG. 15, and it goes without saying that the present invention can be similarly applied to a cathode ray tube having a flat panel surface.

[0092]

As described above, according to the present invention,
Even with the same pin circle diameter as before, power consumption can be further reduced.Especially, even if a dynamic focus type electron gun with a large number of stem pins is sealed in a small-sized cathode ray tube with a neck diameter, the stem fusion can be reduced. Cracks do not occur in the attachment portion, and a highly reliable cathode ray tube can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a stem portion of a cathode ray tube for explaining a configuration of a cathode ray tube according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a stem portion of a cathode ray tube for explaining a configuration of a second embodiment of the cathode ray tube according to the present invention.

FIG. 3 is a sectional view of a main part of a stem portion of a cathode ray tube for explaining a configuration of a third embodiment of the cathode ray tube according to the present invention.

FIG. 4 is a sectional view of a main part of a stem portion of a cathode ray tube for explaining a configuration of a cathode ray tube according to a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view of a principal part for explaining a first structural example of a neck portion of a cathode ray tube and a fused portion of the stem configured using the stem shown in FIG. 1 or FIG. 2;

FIG. 6 is a sectional view of a principal part for explaining a second structural example of a neck portion of the cathode ray tube and a fusion portion of the stem constituted by using the stem shown in FIG. 1 or FIG. 2;

FIG. 7 is a cross-sectional view of a principal part for explaining a third structural example of a neck portion of the cathode ray tube and a fused portion of the stem constituted by using the stem shown in FIG. 1 or FIG. 2;

FIG. 8 is a cross-sectional view of a principal part for describing a fourth structural example of a neck portion of a cathode ray tube and a fused portion of the stem constituted by using the stem shown in FIG. 1 or FIG. 2;

FIG. 9 is a cross-sectional view of a principal part for describing a fifth structural example of a neck portion of a cathode ray tube and a fused portion of the stem constituted by using the stem shown in FIG. 1 or FIG. 2;

FIG. 10 is an explanatory view of a first embodiment of a stem base applied to a cathode ray tube according to the present invention.

FIG. 11 is an explanatory view of a second embodiment of the stem base applied to the cathode ray tube according to the present invention.

FIG. 12 is an explanatory view of a third embodiment of the stem base applied to the cathode ray tube according to the present invention.

FIG. 13 is an explanatory view of a fourth embodiment of the stem base applied to the cathode ray tube according to the present invention.

FIG. 14 is an explanatory view of a fourth embodiment of the stem base applied to the cathode ray tube according to the present invention.

FIG. 15 is a schematic sectional view illustrating a schematic configuration of a color cathode ray tube as an example of a cathode ray tube to which the present invention is applied.

FIG. 16 is an explanatory diagram of a welding operation for sealing a stem to a neck portion.

FIG. 17 is a cross-sectional view of a main part for explaining a fused portion between a neck portion and a stem of a conventional cathode ray tube.

FIG. 18 is a cross-sectional view of a principal part explaining the configuration of only the stem portion of FIG.

FIG. 19 is an explanatory view of a conventional stem base.

[Explanation of symbols]

 10 Dowel 14 Stem pin 17 Stem 18 Exhaust pipe 21 Neck 28 Electron gun.

Claims (5)

[Claims] 1. A neck having a panel portion having a fluorescent film on the inner surface and a stem which is annularly planted through one of a plurality of stem pins for holding an electron gun and for introducing a required signal voltage. And a substantially funnel-shaped funnel portion connecting the other end of the neck portion and the panel portion to form a vacuum envelope, wherein a stem pin is erected inside the vacuum envelope of the stem. A cathode ray tube having a flat surface. 2. A dowel which is raised so as to surround each of said stem pins, at a stem pin implantation base of said stem outside said vacuum envelope on a stem pin implantation surface side. Item 7. The cathode ray tube according to Item 1. 3. A neck having a panel portion having a fluorescent film on an inner surface thereof, and a stem which is annularly planted at one end by penetrating a plurality of stem pins for holding an electron gun and introducing a required signal voltage. And a plurality of funnels connected to the other end of the neck portion and the panel portion, the plurality of the funnel portions having a substantially funnel shape arranged so as to fit to each of the stem pins of the cathode ray tube which constitutes a vacuum envelope. A stem base having a pin hole, wherein a high-voltage pin hole for fitting a high-voltage stem pin for applying a voltage for focus adjustment among the pin holes, and another pin hole adjacent to the high-voltage pin hole. A stem base for a cathode ray tube, wherein a shield-like wall member is provided to isolate only between the high-pressure stem pin fitted into the high-pressure pin hole and another stem pin fitted into another pin hole. 4. The high-pressure stem pin according to claim 3, wherein a plurality of said high-pressure stem pins are provided, and said shield wall member is provided between each of said high-pressure stem pins and another stem pin adjacent to said high-pressure stem pins. Stem base of cathode ray tube. 5. A neck having a panel portion having a fluorescent film on the inner surface and a stem which is mounted in an annular shape through one of a plurality of stem pins for holding an electron gun and for introducing a required signal voltage, and being fused at one end. And a substantially funnel-shaped funnel portion connecting the other end of the neck portion and the panel portion to form a vacuum envelope, and a plurality of pin holes arranged so as to fit into each of the stem pins. A cathode-ray tube having a stem base having a high-pressure pin hole for fitting a high-voltage stem pin for applying a voltage for focus adjustment among the pin holes of the stem base, and another adjacent to the high-pressure pin hole. And a shield wall member for isolating only between the high-pressure stem pin fitted into the high-pressure pin hole and another stem pin fitted into another pin hole.