JPH09330675A - Color cathode ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the positioning of the positioning pawls of a getter support spring by forming recesses biting to the shield cup side on positioning lug base sections provided on the shield cut opening end edge of an electron gun. SOLUTION: A pair of positioning lugs 5a, 5b of a getter support spring 3 are formed at the symmetrical positions with the tube axis at the position slightly drifted from the center of the side wall of a shield cup 1. Recesses 8 are formed at the base sections of the lugs 5a, 5b retreatively in the direction of the shield cup 1. The width size W1 in the peripheral direction of the shield cup 1 on the positioning pawls 3a cut and formed at both ends in the width direction of the support spring 3 and the width size W2 of the recess 8 formed at the base sections of the lugs 5a, 5b formed on the opening end edge are selected to W1>W2, and positioning can be made with high accuracy when the positioning pawls 3a of the getter support spring 3 are brought into contact with the base sections of the positioning lugs 5a, 5b.

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 in which a getter support spring having one end fixed to a shield cup constituting an electron gun and a getter supported at the other end is installed at an accurate position. Regarding tubes.

[0002]

2. Description of the Related Art A color cathode ray tube used as a monitor tube of a television picture tube or an information terminal has an electron gun for emitting a plurality (generally three) of electron beams at one end of a vacuum envelope, and others. A plurality of phosphors, each of which has a phosphor screen coated with phosphor films of a plurality of colors (three colors) and an internal shadow mask, which is a color selection electrode installed close to the phosphor screen, and which is emitted from the electron gun. A desired image is displayed by two-dimensionally scanning the electron beam of (2) with a magnetic field generated by a deflection yoke installed outside the vacuum envelope.

FIG. 7 is a cross-sectional view for explaining an example of the structure of a color cathode ray tube to which the present invention is applied.
1 is a neck portion, 22 is a funnel portion, 23 is a phosphor film,
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 in-line electron gun, 29 is a deflection yoke, 30 is a beam correction device, and 31 is an internal conductive film. 1 is an electron gun 2
The shield cup 2 constituting the reference numeral 8 is a contact spring for supplying the anode voltage from the inner conductive film 31 to the electron gun 28 and positioning the electron gun 28 at a predetermined position in the neck portion 21. Getter support spring that fixed one end and supported the getter on the other end,
4 is a getter.

In this color cathode ray tube, a vacuum envelope is formed by a panel portion 20 and a neck portion 21, and a funnel portion 22 connecting the panel portion 20 and the neck portion 21.

A so-called display screen having a phosphor film 23 coated with phosphors of three colors is formed on the inner surface of the panel portion 20,
An electron gun 28 that emits three electron beams in-line is housed inside the neck portion 21.
A shadow mask 24 having a large number of apertures or a blind shape is provided near the phosphor film 23.

Bc and Bs are three electron beams (B
c, Bs × 2), showing the funnel portion 22 and the neck portion 2
A deflection yoke 29 is externally mounted on the first transition region.

The three electron beams Bc and Bs emitted from the electron gun 28 are deflected in two directions, horizontal and vertical, by the vertical and horizontal deflection magnetic fields generated by the deflection yoke 29, and are colored by the aperture of the shadow mask 24. A color image is formed on the phosphor film 23 by receiving the selection and impinging on each phosphor.

FIG. 8 is a side view for explaining the entire structure of the electron gun used in the color cathode ray tube according to the present invention.
8 is an electron gun, P is a pin, S is a stem, K is a cathode, G
Is a grid group.

In this electron gun, a getter support spring 3 is welded to a shield cup 1. One end of this getter support spring 3 is fixed between the contact springs 2 and the other end supports a getter 4 housed in a container. Has been done.

The getter 4 is heated by the energy of high frequency or the like applied from the outside after the color cathode ray tube is assembled and is evaporated and scattered to increase the degree of vacuum in the vacuum envelope.

That is, the getter 4 is welded to its shield cup in the process of assembling the electron gun.

Conventionally, the getter support spring 3 is positioned on the shield cup 1 by contacting a claw formed near one end of the getter support spring with an open edge of the shield cup to determine the position in the tube axis direction and the shield cup. Positioning in the circumferential direction was carried out by using a method of applying a jig to the projection 6 for welding the contact spring formed on the shield cup 1 and a marking formed on the side wall of the shield cup as a guide.

9A and 9B are explanatory views of an example of a conventional positioning method for attaching a shield cup and a getter support spring. FIG. 9A is a side view and FIG. 9B is A in FIG.
It is a principal part sectional drawing cut | disconnected by the A line. In addition, 1a is an engraved mark on the side surface of the shield cup 1 and 3a is a positioning claw.

In FIG. 1 (a), the formation position of the marking 1a is, for example, 2.0 ± 2 from the center of the outer wall of the shield cup 1 to the one contact spring welding projection 6 side.
It is formed at a position of 0.1 mm, 5.0 mm in the tube axis direction, and 1.0 mm retracted from the open end of the shield cup 1. The marking 1a is also formed on the opposite side of the shield cup 1 in the circumferential direction.

Conventionally, the side edge of the getter support spring is aligned with the marking 1a for circumferential alignment, and the position in the pipe axis direction is the getter support spring 3 shown in FIG. The positioning claw 3a formed near one end is brought into contact with the open end edge of the shield cup 1.

10 (a) and 10 (b) are explanatory views of another example of the conventional positioning method when the shield cup and the getter support spring are attached, wherein (a) is a side view and (b) and (c) are enlarged views of the main parts thereof. Is.

In this prior art example, a projection 5 for positioning the getter support spring 3 is formed separately from the projection 6 for welding the contact spring on the open end of the shield cup 1 to form the getter support spring in the circumferential direction and the tube. The alignment with the axial direction is performed at the same time.

That is, as shown in FIG. 1A, the getter support spring 3 is provided at the open end of the shield cup 1 in addition to the projection 6 for welding the contact spring.
Is formed with a projection 5 for positioning.

Positioning claws 3a formed on the getter support spring 3 are brought into contact with the projections 5 to simultaneously align the circumferential direction and the pipe axis direction.

[0020]

When the getter support spring 3 is attached to the shield cup 1, a jig is applied to the contact spring welding projection 6 formed on the open end of the shield cup 1 to surround the shield cup 1. In the method of positioning in the direction and welding after that, a jig for that purpose is required, and the work efficiency is reduced.

In the method of aligning the side edges of the getter support spring 1 described above with reference to FIG. 9 by aligning the engraved marks 1a, the operator sets the position visually, so that accurate positioning is performed. It is difficult to perform, and there is a large variation in accuracy among workers.

Further, the positioning projection 5 described with reference to FIG. 10A is provided, and the projection 5 has a positioning claw 3a which is a positioning portion of the getter support spring 3.
In the case of aligning the protrusion 5 with the base of the projection 5, as shown in FIG. 7B, due to the existence of the curved edge portion 9 of the base, which is inevitably generated in punching and drawing, When the positioning claw 3a is pressed against the base of the protrusion 5, accurate positioning is not performed, resulting in a decrease in accuracy.

Further, in this type of cup-shaped electrode component such as a shield cup, a flat plate is formed by drawing. Particularly, when a protrusion is formed on the open end of the shield cup, when drawing the flat plate, or After drawing, the part corresponding to the open end is made into a flange shape and the required press processing is performed, and after that,
The whole is made into a cup shape by drawing again.

In the shield cup formed by such a processing method, a so-called ironing residue 10 may be formed at the base of the protrusion 5, as shown in FIG.

For this reason, the positioning claw 3a of the getter support spring 3 on the projection 5 hinders accurate positioning of the squeeze debris 10 formed on the base portion, which also lowers the mounting accuracy.

The object of the present invention is to solve the above-mentioned problems of the prior art, without using a special positioning jig, and to use the positioning projection 5 on the positioning claw 3a of the getter support spring 3. A color cathode-ray tube equipped with an electron gun having a shield cup having a structure capable of performing positioning with high precision when abutting against the base of the projection 5 and avoiding generation of ironing residue on the base of the projection. To provide.

[0027]

In order to achieve the above object, the present invention provides an open end of a shield cup of an electron gun.
The present invention is characterized in that a projection for positioning the getter support spring which is projected in the tube axis direction is provided, and a recessed portion that digs into the shield cup side is formed at the base of the projection.

That is, in the first aspect of the present invention, a panel portion having a phosphor film of a plurality of colors on its inner surface, a shadow mask structure suspended in the vicinity of the phosphor film, and a plurality of electron beams are provided. A neck part containing an electron gun to fire,
And a vacuum envelope consisting of a funnel portion connecting the panel portion and the neck portion, a deflection yoke externally mounted in the transition region between the funnel portion and the neck portion, and one end fixed to the open end of the shield cup constituting the electron gun. In the color cathode ray tube having at least a getter support spring having a getter mounted on the other end, the shield cup 1
And a pair of positioning claws 3a for restricting the position in the tube axis direction by cutting and raising a part of each of the getter support springs 3 in the width direction both ends and abutting them on the tube cup direction open end of the shield cup. Then, the shield cup 1 restricts the position in the direction orthogonal to the tube axis by abutting one side surface of the pair of positioning claws 3a provided at one end of the getter support spring 3 on the open end in the tube axis direction. The projection 5 is formed in the tube axial direction as shown in FIG.
A concave portion 8 is formed at the base portion of the shield cup 1 so as to recede from the open end of the shield cup 1 and enter the shield cup 1 side.

With the structure of the first invention, when fixing one end of the getter support spring 3 to the shield cup 1 by welding or the like, the positioning claw 3a formed near the one end of the getter support spring 3 is attached to the shield cup 1.
When the projection 5 formed on the open end of the projection 5 is pressed in the tube axial direction and the circumferential direction of the shield cup 1, the presence of the recess 8 formed at the base of the projection 5 is shown in FIG. Since there is no curved edge portion 9 as described above, and since there is no generation of the aperture dust 10 shown in FIG. 7C, the positioning claw 3a of the getter support spring 3 and the protrusion 5 formed on the open end edge of the shield cup 1 are not formed. The base and the open edge of the shield cup 1 can be accurately aligned, and the getter support spring is always accurately aligned with the shield cup without the need for jigs, markings, or other special alignment means. Therefore, it becomes possible to manufacture a high-precision electron gun.

Therefore, a color cathode ray tube using this electron gun has no characteristic variations and high quality image display can be obtained.

In a second aspect of the invention, the width of the shield cup 1 in the circumferential direction of the positioning claws 3a formed on both side edges of the getter support spring 3 in the first aspect is W1. The width dimension of the recess 8 in the circumferential direction of the shield cup 1 is W2 and W2> W2.

With the configuration of the second invention, when the getter support spring is positioned with respect to the shield cup according to the first invention, the contact between the positioning claw 3a and the open end of the shield cup 1 is ensured. .

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a color cathode ray tube according to the present invention will be described below in detail with reference to the illustrated embodiments.

FIGS. 1A and 1B are explanatory views of a configuration example of a shield cup constituting an in-line type electron gun used for a color cathode ray tube according to the present invention, wherein FIG. 1A is a front view and FIG. 1B is a side view.

In the figure, 1 is a shield cup, 5
Reference numerals a and 5b are projections for positioning the getter support spring, 6a, 6b, 6c and 6d are contact spring welding projections, and 7a, 7b and 7c are electron beam passage holes.

Protrusions 5a, 5 for positioning the getter support spring formed on the open end of the shield cup 1
A pair of b is formed at a position slightly deviated from the center of the side wall of the shield cup 1 (direction passing through the tube axis and perpendicular to the in-line arrangement direction) and symmetrical to the tube axis of the shield cup 1.

This is because the getter support spring 3 can be attached at a predetermined position even when the shield cup 1 is rotated by 180 °.

In this embodiment, the protrusions 5a and 5b are formed with a width of 2 to 3 mm in the circumferential direction from the position where the angle is 9 ° ± 1.5 ° from the center of the side wall of the shield cup 1.
The amount of protrusion in the tube axis direction is 0.8 mm.

FIG. 2 is an enlarged view of an essential part of a portion B surrounded by a circle in FIG. 1, which is an enlarged view of a portion 5a for positioning the getter support spring formed on the open end of the shield cup. And 8 indicates a recess formed in the base of the protrusion 5a (5b).

As shown in the figure, the concave portion 8 has a protrusion 5a.
At the base of (5b), it is formed so as to recede in the direction of the shield cup 1. Therefore, the existence of the concave portion 8 avoids the formation of the curved edge portion 9 of the base portion as shown in FIG. 10B, and the ironing residue 10 as shown in FIG. 10C is generated by the concave portion 8. It does not affect the positioning of the getter support spring 3.

FIG. 3 is a side view showing a state in which the getter support spring is positioned and attached to the open end of the shield cup using the projection having the recess shown in FIG. 2, and 3 is the getter support spring. The same reference numerals as those in FIG. 1 correspond to the same parts.

In the figure, the getter support spring 3 is aligned with the shield cup 1 with high accuracy and then fixed by welding.

FIG. 4 is an enlarged view of an essential part showing a position aligning portion between the getter support spring and the shield cup in FIG. 3. 3a is a positioning claw, and the same reference numerals as those in FIG.

In the figure, the positioning claws 3 are formed by cutting and raising both ends of the getter support spring 3 in the width direction.
a (the other claw is not shown) in the circumferential width W1 of the shield cup 1 and the same width W2 of the recess 8 formed at the base of the projection 5a formed at the open end of the shield cup 1. Are selected so that W1> W2.

In this embodiment, W1 = 0.5 mm, W2 =
0.2 mm.

FIG. 5 is an explanatory view of a method of forming a getter support spring positioning protrusion on a shield cup constituting an electron gun of a color cathode ray tube according to the present invention.

First, drawing with a flange is performed,
The flange has a depth of 0.5 m as shown in Fig. 3 (a).
A concave shape having m and a radius of curvature R of 0.15 is processed by press punching. The flange shape after processing is indicated by 14. The contact spring welding projections 6a, 6b, 6c, 6d
Is conventional.

This is again drawn to raise the flange portion, and as shown in FIG.
The shield cup 1 having the protrusions 5a, 5b for positioning the getter support spring and the protrusions 6a, 6b, 6c, 6d for welding the contact springs on the open end can be obtained. This raising process causes shrinkage in the protrusions, and the widthwise dimension W2 of the protrusions 5a and 5b is about 0.2 m.
m.

In this way, required projections can be formed on the open end of the shield cup 1.

FIG. 6 is a schematic explanatory view of a process of processing a shield cup which constitutes an electron gun of a color cathode ray tube according to the present invention in which a getter support spring positioning projection is formed.

In FIG. 1, first, (a) a long thin metal plate 11 such as SUS is punched out to obtain a disc-shaped plate body 1.
Make 2 (b).

This is drawn to form a cup-shaped intermediate member 1'having a flange 13 (c).

As described with reference to FIG. 5, the flange 13 is press-formed with a portion corresponding to the getter support spring positioning protrusion and a portion corresponding to the contact spring welding protrusion having a recess at the base (d).

Finally, (e) By raising the flange portion again by drawing, the projections 5a, 5b for positioning the getter support spring and the projections 6a, 6b for welding the contact springs are formed on the open edge. 6
c and 6d are formed.

Through the above processing steps, the shield cup 1 including the getter support spring positioning protrusions 5a and 5b having the recess 8 formed in the base and the contact spring welding protrusion is obtained.

Incidentally, instead of simultaneously processing the cup-shaped intermediate member 1'and the flange 13 in the step of FIG. 7C, the flange 13 may be formed after forming the cup-shaped whole.

According to the above embodiment, the getter support spring can be attached to the shield cup with high accuracy.

[0058]

As described above, according to the present invention,
Without using a special positioning jig, the positioning projection can be accurately aligned when the positioning claw of the getter support spring is brought into contact with the base of the projection. It is possible to provide a color cathode ray tube equipped with an electron gun having a shield cup that avoids the generation of iron scraps at the base of the protrusion.

[Brief description of drawings]

FIG. 1 is an explanatory view of a configuration example of a shield cup constituting an in-line type electron gun used for a color cathode ray tube according to the present invention.

FIG. 2 is an enlarged view of a main part of a portion B surrounded by a circle in FIG.

FIG. 3 is a side view showing a state in which a getter support spring is positioned and attached to the open end of the shield cup by using the protrusion having the recess shown in FIG.

FIG. 4 is an enlarged view of an essential part showing a position alignment portion between a getter support spring and a shield cup in FIG.

FIG. 5 is an explanatory view of a method of forming a getter support spring positioning protrusion on a shield cup which constitutes an electron gun of a color cathode ray tube according to the present invention.

FIG. 6 is a schematic explanatory view of a process of processing a shield cup which constitutes an electron gun of a color cathode ray tube according to the present invention in which a getter support spring positioning protrusion is formed.

FIG. 7 is a cross-sectional view illustrating a structural example of a color cathode ray tube to which the present invention is applied.

FIG. 8 is a side view illustrating the overall configuration of an electron gun used in the color cathode ray tube according to the present invention.

FIG. 9 is an explanatory diagram of an example of a positioning method when mounting a conventional shield cup and a getter support spring.

FIG. 10 is an explanatory diagram of another example of the positioning method when the conventional shield cup and getter support spring are attached.

[Explanation of symbols]

1 Shield cup 3 Getter support spring 3a Positioning claws 5a, 5b Protrusions for positioning getter support springs 6a, 6b, 6c, 6d Contact spring welding protrusions 7a, 7b, 7c Electron beam passage holes.

Claims (2)

[Claims] 1. An inner surface having phosphor films of a plurality of colors,
A vacuum envelope comprising a panel portion in which a shadow mask structure is suspended in proximity to the phosphor film, a neck portion accommodating an electron gun for emitting a plurality of electron beams, and a funnel portion connecting the panel portion and the neck portion. A color cathode wire having at least a getter support spring having one end fixed to an open end of a shield cup forming an electron gun and a getter mounted on the other end, and a deflection yoke exteriorly mounted on a transition region between a funnel portion and a neck portion In the pipe, the shield cup and the getter support spring are provided with a pair of ends for both ends in the width direction, a part of which is cut and raised and abutted against the pipe axial direction open end of the shield cup to regulate the position in the pipe axial direction. The shield cup has a claw, and one end of the getter support spring is provided at the open end of the shield cup in the tube axial direction. Has a projection formed in the tube axis direction so as to abut one side surface of the positioning claw to regulate the position in the direction orthogonal to the tube axis, and the projection is retracted from the open end of the shield cup at the base of the projection. A color cathode ray tube having a recess formed by being inserted into the shield cup side. 2. A shield cup circumferential width dimension of a positioning claw formed on both side edges of the getter support spring is W1 and a shield cup circumferential width dimension of the recess is W2 according to claim 1, A color cathode ray tube, wherein W1> W2.