JPS62256346A - Color cathode-ray tube and its manufacture - Google Patents

Abstract

PURPOSE:To simplify formation and assembling, by holding a magnetic spherical body inside a recessed part, which is formed on a cap part of a plate spring, with a holding means having a magnet so that a frame for a color selection means can be mounted/dismounted on/off a panel part. CONSTITUTION:When a frame 4 is mounted/dismounted on/off a panel part 1, a yoke 61 of a holding means 63 is put on a cap part 21 and its magnet 62 is located in a position opposite to a recessed part 23, and then a magnetic spherical body 52 located inside the recessed part 23 is held. Arrangement of the holding means 63 forms a closed magnetic path, the loop from an end of the magnet 62-the spherical body 52-the yoke 61-the magnet 62, making the spherical body 52 to be attracted by the magnet 62 through the cap part 21 and held inside the recessed part 23. Therefore, the spherical body 52 can be engaged/disengaged with the recessed part 53, according to engagement/ disengagement of the cap part 21 with the stud pin 15.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to facing a color phosphor surface and landing an electron beam corresponding to each color onto a phosphor pattern of a predetermined color on the color phosphor surface. This invention relates to a color cathode ray tube equipped with color selection means and a method for manufacturing the same.

[Summary of the invention]

In the case where the color selection means is attached to the panel part of a color cathode ray tube body by engagement with a stud pin such as a leaf spring, the leaf spring is provided with a cap part that covers the stud pin, and the cap part The bottom surface of the stud pin and the top surface of the stud pin are provided with recessed portions facing each other, and a magnetic sphere is sandwiched between these four portions, so that the color sorting means can be reliably and firmly set in a predetermined positional relationship with respect to the panel portion. At the same time, the assembly is simplified.

[Conventional technology]

In a color cathode ray tube, as shown in Fig. 4, the panel part of the cathode ray tube body (
1), a color selection means (2) such as a shadow mask or an aperture grill is arranged. As shown in FIG.
) color-selecting electrode (3) consisting of an array of metal wires.
consists of, for example, an aperture grill stretched over a frame (4). Frame (4) has a pair of opposite frame sides (
4^) and (4B) and these frame sides (4A) and (4B)
A pair placed across the gap! R part (4C) and (4D)
The color selection electrode (3) is stretched between the frame sides (4A) and (4B).

Attachment of the color sorting means (2) to the panel part (11) is as follows:
Since this color selection means (2) is usually formed by optically printing a phosphor pattern of each color as an optical mask, it must be removably attached to a predetermined position, and it must be attached to, for example, a cathode ray tube. It is necessary to be able to return to a predetermined position even if an external shock is applied, such as by accidentally dropping the product or colliding with another object, after the product has been completed.

For example, as disclosed in Japanese Utility Model Publication No. 53-20227, the color sorting means (2) can be attached to the panel part (1) using a stud pin (5) and a handling spring (6). For example, the frame (
・One end of the leaf spring (6) is welded to each of the opposing arms (4C) and (4D) of 1) and the frame side (4B), and a hole is drilled at the free end of each of these leaf springs (6). In the through hole (7),
Each time a fritted stud pin (5) is fitted to the inner surface of the panel part (1), Ra can be freely held at a predetermined position.

The stud pin (5) is made of ceramic, for example.
The head has a conical shape, and the through hole (7) of the leaf spring (6) is the sixth
As shown in Fig. 7 and Fig. 7, the stud pin (5) is recessed into an inner shape having three sides (7A) (7B) (7G) circumscribing the circumferential surface of the stud pin (5), and a through hole. (
7) and the inner peripheral edge of each side (7A) (7B) (7C
) at each point P^.

The position is determined by point contact at three points, PB and Pc.

With such a configuration, as cathode ray tubes have become larger in size in recent years, and the color selection means (2) has accordingly become larger and heavier, reliability problems will arise. . That is, in the case of such a configuration, for example, due to an impact,
If the axes of the stud pin (5) and the through hole (7) of the slope spring (6) do not match, or the contact between the two becomes unbalanced, the stud pin may peel off. A problem arises. This will be explained. Now, for example, the 6th
In the figure, with the contact point PC as a fulcrum, the free end side of the leaf spring (6) is lifted with respect to the line passing through this point PC and the center of the through hole (η, that is, in the longitudinal direction of the leaf spring (6) in FIG. 6, Considering the case where the fixed end side is tilted so that it is pressed against the base side of the stud pin (5),
As the color sorting means (2) becomes larger and has a larger size of 21R, the diameter of the stud pin (5) increases due to the need to increase the support strength. At the facing peripheral position 'aP(:t), a large moment acts, which causes separation.

In order to ensure the engagement between the stud pin (5) and the leaf spring (6), the following steps must be taken to ensure their positioning:
It is preferable to make point contact at the plurality of points, for example, three, as mentioned above, so that the action of the force based on the above-mentioned impact, etc., and the contact between the stud pin (5) and the through hole (7) of the leaf spring (6) can be avoided.
Mislanding, such as mis-landing, such as wear and tear of the through hole (7) due to digging in, misalignment due to changes in shape due to damage, etc.
In other words, problems such as color shift occur.

[Problem that the invention seeks to solve]

The present invention aims to avoid the inconvenience caused by adopting the above-mentioned conventional configuration in which the color sorting means is supported by engagement between a stud pin and a leaf spring, and also to accurately position the color sorting means in the panel section. be able to do so.

Prior to explaining the present invention, a color cathode ray tube to be contrasted with the present invention will be explained. The structure is such that a part that mainly receives force when an external impact is applied and a part used for positioning are separated. That is, the eighth
As shown in the figure, a cross-sectional view of the engagement portion between the stud pin and the slope spring, the panel portion of the color cathode ray tube body (the mounting portion of the color selection means (11) and the frame (4) of the color selection means (2))
A cylindrical stud pin for positioning (
15) is attached by means of a frit or the like, and a leaf spring (16) is provided on the other side to engage with this stand bin (15). This leaf spring (16) is provided with a cap part (21) that covers the top of the stud pin (15) at the engagement part with the stand bottle (15). and stand bin (15)
The top surface (15a) of the top surface (15a) and the cap portion (21
), a protrusion (22) is provided on one of the axes of the bottom surface (21a), and a recess (2) that engages with the protrusion (22) in the direction intersecting the direction of action of the leaf spring (16) is provided on the other side.
3). The protrusion (22) and the recess (23) are each shaped to have a stable point of engagement on its central axis. Then, in this engaged state, the cap part (21)
and the stud pin (15) so that a gap g is created between the °C leaf spring (16) and the methanol pin (15).
However, the engagement portion between the protrusion (22) and the recess (23) is used as a fulcrum to swing slightly, and the protrusion (22) is allowed to move up to the periphery of the fourth portion (23). In this way, when such rocking or movement occurs due to fijing etc., the circumferential surface of the stand bottle (15) and the cap part (
The inner peripheral surfaces of 21) or the inner peripheral edges of the openings are brought into contact with each other by surface contact or line contact.

According to such a configuration, the color sorting means (2) can be attached to the panel part (1) using the leaf spring (16) and the stud pin (
15), so it can be attached and detached freely.In addition, the elasticity of the plate spring (16) cushions the impact from the outside, such as when accidentally dropping it, and returns it to its original position. However, especially in the above-described configuration, the position of the color sorting means (2) on the panel part (1) is set by the stud pin (15) and the protrusion (22) of the leaf spring (16). This is achieved by the engagement between the plate spring (1) and the recess (23), and the external impact is thereby
6) swings or moves relative to the stud pin (15), so that it is received mainly by the joint between the inner circumferential surface of the cap portion (21) or the opening circumferential edge and the outer circumferential surface of the stud pin (15). Therefore, it is possible to avoid positioning errors caused by impact, and since the 111 joint is in surface contact or line contact, it is possible to prevent large forces from acting locally on the stand bin (16). Stud pin (1
6) The problem of peeling at the attachment portion is effectively avoided.

However, in color cathode ray tubes with such a configuration, as the cathode ray tube becomes larger and the entrance of the color sorting means (2) becomes even larger, the projections (22) and the recesses (2) become larger.
1 of the contact part with 3)? ! If the coefficient of friction cannot be made sufficiently small, there is a risk that the protrusion (22) may be damaged due to sudden IH impact from the outside.

In the present invention, it is an object of the present invention to provide a color cathode ray tube and its manufacturing method that avoids such inconveniences, obtains the same effect as the above-mentioned protrusions and recesses, and further simplifies its manufacturing and assembly. .

[Means for solving problems]

In the color cathode ray tube according to the present invention, as shown in FIGS. 1 and 2, the panel portion (1
), stud pins are attached to either the mounting part of the color sorting means (2), specifically the inner surface of the peripheral wall of the panel part (1), the so-called skirt part, or the frame (4) of the means (2). (15) is attached with a frit or the like, and a slope spring (16) having a cap portion (21) that covers the stud pin (15) is provided on the other side.

And the top surface (15a) of these stud pins (15)
For example, conical recesses (53) and (23) are formed on the respective central axes of the bottom surface (21a) of the cap portion (21).
are provided, and a magnetic sphere (52) is sandwiched within these recesses (53) and (23). The magnetic sphere (52) has a diameter such that it is in line contact with the inner surface of each recess (53) and (23), and a small gap is created between the top surface (15a) and the bottom surface (21a). selected according to size.

Furthermore, in the present invention, the frame (4) is attached to and detached from the panel part [1] in the manufacturing process of the color cathode ray tube having such a configuration by the following method.

That is, in the present invention, as shown in FIG. The cap part of the leaf spring (16) (
The magnetic sphere (2) is held in the recess (23) provided in 21).

In FIGS. 2 and 3, parts corresponding to those in FIG. 8 are given the same reference numerals to avoid redundant explanation.

[Effect]

As described above, in the present invention, the cap portion (21) of the leaf spring (16) and the stand bottle (15) are brought into contact with each other by the sphere (52). ), a metal ball with high strength can be used, and since it is a sphere, even if it is used as a heavy color sorting means (2), a sudden impact will be applied to the cap part (21) and the stud pin (2). 15), the sphere (52) will move while rotating, so
While obtaining the same effect as the structure described in FIG. 8, damage to the product can be avoided. Also, like this, a sphere (
52), the use of a magnetic sphere as the sphere (52) allows it to be held in place by the magnetic holding means (63). Cathode ray tube manufacturing operations such as attachment and removal to (1), for example, formation of a color fluorescent surface on the inner surface of panel portion (1), can be easily and reliably performed.

〔Example〕

Further, an example of the present invention will be explained in detail with reference to FIGS. 1 to 3. This example is an aperture grill type color sorting means (2)
In this case as well, as explained in FIGS. 4 and 5, a slit-like electron beam transmission aperture extending along the vertical direction ( A color selection means (2) is constituted by, for example, an aperture grill, in which a color selection electrode (3) made of a thin metal plate having an array of electrodes 3a) is stretched over a frame (4). The frame (4) has a pair of opposing frame sides (4^) and (4n) and a pair of arms (4C) and (40) disposed across these frame sides (4A) and (4B). ) and more.
A color selection electrode (3) is stretched between the frame sides (4^) and (4B).

In this example, leaf springs (16
) by welding one end of each leaf spring (16) and engaging a stud pin (15) fritted on the inner surface of the panel part (11) at the free end of each leaf spring (16).
2) to be freely deposited and held in a predetermined position.

The stud pin (15) is made of ceramic or metal and has a columnar or cylindrical shape, as described in FIG. The leaf spring (16) is made of a band-shaped plate made of 5US610, for example, and has a through hole (24) at its free end, into which a central lug portion (21) that covers the stud pin (15) is inserted into the free end. be fitted.

The cap part (21) has a cylindrical shape with, for example, an annular flange part (21b) integrally provided at its open end, and is made separately from the leaf spring (16) by, for example, press working of a stainless metal plate. It will be done.

The through hole (24) may be a circular hole having an inner diameter larger than the outer diameter of the cylindrical portion of the cap portion (21), or may be made wide only in the direction in which movement adjustment of the cap portion (21) is required. Make it a long hole.

The flange part (21b) of the cap part (21) should have a larger diameter than the through hole (24), or if the through hole (24) is a long hole, it should be at least larger than the width of its short diameter. The flange portion (21b) is fixed to the leaf spring (16) by spot welding or the like.

On the central axis of the top surface (15a) of the stand bin (15), for example, a recess (53) is provided integrally with the stud pin (15) at the same time as the stud pin (15) is molded.

On the other hand, a recess (23) is provided on the central axis of the bottom surface (21a) of the cap (21). This concave portion (23) can be formed on the bottom surface (21a) of the cap portion (21) itself by press working, etc.
It is also possible to press-fit a disc made of a material such as ceramic, which has low frictional resistance with the protrusion (22), and form a recess (23) in the center of the disc.

Then, the magnetic sphere (52) is inserted into these recesses (53) and (23).

On the other hand, in the present invention, a holding means (63) for the magnetic sphere (52) is prepared. For example, as shown in FIG. 3, this holding means (63) is comprised of a magnet (62) that is NS magnetized in the direction of the axis on the axis of the cup-shaped yoke (61).

When attaching the frame (4) to the panel i (1) or removing it from this attached state, the yoke (61) of the holding means (63) is attached to the cap portion (
21), its magnet (62) is placed in a position facing the recess 9 (23), and the magnetic sphere (52) placed within this recess (23) is held. That is, by arranging the holding means (63) in this way, the sphere (52) - yoke (61) - magnet (62) can be separated from the end of the magnet (62).
A closed magnetic path is formed, and the sphere (52) is connected to the cap part (21).
is attracted to the magnet (62) via the recess (
23) held within. Therefore, in this state, the sphere (52) can be engaged and disengaged in the recess (53) as the cap portion (21) is engaged and disengaged from the stud pin (15).

In the illustrated example, the slope spring (16) and the stud pin (15) are installed at three locations on both the left and right sides and the bottom side of the frame (4), and this arrangement is not possible. (In fact, in large pipes, there are two plate springs (16) on each side of the upper and lower sides of the frame (4).
It is desirable to arrange an engaging portion between the stud pin (15) and the stud pin (15).

In addition, in the above example, the plate bone (16) is attached to the frame (4) and the stud pin (15) is provided on the panel part (1) side, but the frame (4) has a stand pin ( 1
5), and a leaf spring (16) may be provided on the panel portion <11 side.

Further, the present invention is not limited to the case where it is applicable to a color cathode ray tube having an aperture grill-type color selection means (2) as in the above example, but also having various color selection means (2) such as a shadow mask. Can be used with color cathode ray tubes.

[Effects of the Invention] As described above, in the present invention, the color sorting means (2) is
As mentioned above, the positioning is done by connecting the stud pin and the cap part (21) provided on the leaf spring that engages with the stud pin to the panel part (1).
By sandwiching and engaging the magnetic sphere (52) between 3) and (23), the large ff1ffl color sorting means (2) can also be used with this engaging part as explained in FIG. The engagement and support can be performed reliably without causing damage as in the case of a protrusion structure.

In addition, since the magnetic sphere (52) can be held in one of the recesses (23) by the holding means (63) having a magnet (62), the color sorting method in each step of manufacturing the cathode ray tube is ¥2t (21 The panel portion (11) can be easily and reliably engaged with and removed from the panel portion (11).

[Brief explanation of drawings]

FIG. 1 is a rear view of the mounting part of the color selection means of an example of a color cathode ray tube according to the present invention, FIG. 2 is a sectional view of the engagement part between the stud pin and the leaf spring, and FIG. 4 is a rear view of the mounting portion of the conventional color sorting means, FIG. 5 is a perspective view of the color sorting means, and FIG. 6 is a plan view of the engagement portion between the stud pin and the temporary spring. 7 is a cross-sectional view taken along the line 8-A in FIG. 6, and FIG. 8 is a cross-sectional view of the main parts of a color cathode ray tube compared with the present invention. (11 is the panel part, (2) is the color selection means, (3) is the color selection electrode, (15) is the stud pin, (15a) is the top surface, (16) is the leaf spring, (21) is the cap Part, (
21a) is the bottom surface, (52) is the sphere, (53) and (
23) is a recess, and (63) is a holding means for the sphere.

Claims (1)

[Scope of Claims] 1. A positioning stud pin is attached to either the attachment part of the color selection means of the panel part of the color cathode ray tube tube body or the frame of the color selection means, and this stud pin is attached to the other side. A leaf spring having a cap portion that is crowned by the stud pin is provided, recesses are provided at mutually opposing positions on the top surface of the stud pin and the bottom surface of the cap portion, respectively, and a magnetic sphere is arranged between the two recesses. Color cathode ray tube. 2. A stud pin for positioning is attached to either the attachment part of the color sorting means of the panel part of the color cathode ray tube body and the frame of the color sorting means, and a cap part that covers the stud pin is attached to the other side. A plate spring is provided, a recess is provided at a position facing each other on the top surface of the stud pin and the bottom surface of the cap portion, and a magnetic sphere is placed in the recess on the bottom surface of the cap portion. A method for manufacturing a color cathode ray tube, characterized in that the cap portion and the stud pin are engaged and disengaged by being held by a holding means having a magnet disposed outside the tube.