JP2002279910A - Color cathode-ray tube and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color cathode-ray tube that is superior in impact resistance. SOLUTION: A panel pin 3 arranged inside a panel of the color cathode-ray tube has a projection 3a near the tip thereof. An elastic support 2 mounted on a frame, arranged inside the panel receives the projection 3a that passes through a passing hole 2c, and engages a conical side of the panel pin 3 via pressing force by elastic restoring force, to thus support the frame on the panel. In order to prevent the projection 3a from slipping out of the passing hole 2c for disengaging the elastic support 2 from the panel pin 3, a locking member 1 fixed to the elastic support covers a part of the insertion hole 2c.

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 a method of manufacturing the same, and more particularly, to an improvement for improving impact resistance.

[0002]

2. Description of the Related Art FIGS. 8 to 11 show a mounting mechanism between a panel 4 and a color selection mechanism assembly 12 in a conventional color cathode ray tube. More specifically, FIG. 8 is a rear view illustrating the inside of the panel of the color cathode ray tube before the funnel is connected, and FIG. 9 is a perspective view of the elastic support 8 and the panel pin 13 before being attached to each other. FIG. 10 shows the elastic support member 8 and the panel pin 13 attached to each other.
11 is a sectional view taken along line III-III of FIG.

The panel 4 has a face portion 5 and a skirt portion 6, and a panel pin 13 is attached to each corner of the skirt portion 6. Color sorting mechanism assembly 12
A shadow mask 10 having a metal thin plate having an electron beam transmission hole 11 formed thereon, a frame 9 having a metal plate thicker than the metal thin plate and holding the shadow mask 10,
An elastic support member (8) provided at a corner of the frame (9). The elastic support 8 is made of a metal plate, and has a free end 8a and a fixed end 8b. Free end 8a
The other end of the free end 8a and the other end of the fixed end 8b are connected to each other such that one end of the fixed end 8b faces one end of the fixed end 8b. The other end of the fixed end 8b is fixed to a corner of the frame 9. The other end of the free end 8a has an insertion hole 8c, and engages the conical side surface of the panel pin 13 inserted into the insertion hole 8c with elastic pressing force.
Thereby, the frame 9 is supported on the panel 4. FIG. 8 shows only a part of the electron beam transmitting hole 11 for convenience of drawing.

[0004]

In a conventional process for manufacturing a color cathode ray tube having the above-described structure, a process of forming a black matrix on a panel surface, a process of forming a phosphor pixel for each color, and the like are performed in a panel. Since the attachment / detachment of the color selection mechanism assembly 7 to the color selection mechanism assembly 4 is repeated, the panel pin 13 is formed in a truncated cone shape so that the color selection mechanism assembly 7 can be easily attached / detached, and the elastic support 8 has an elastic pressing force. It is formed to be about 2 kg weight (about 20 N). For this reason, the panel pin 13 and the elastic support 8 tend to become unstable with each other, and when an impact such as dropping is applied to the completed color cathode ray tube from the outside, the panel pin 1
There has been a problem that the engagement between the elastic support 3 and the elastic support 8 is disengaged or the engagement position is shifted, and as a result, color unevenness easily occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and has as its object to provide a color cathode ray tube having excellent impact resistance and a method of manufacturing the same.

[0006]

An apparatus according to a first aspect of the present invention is a color cathode ray tube, comprising: a panel; a projection having a tapered shape projecting toward the inside of the panel; and a part of a side surface of the projection. A panel pin attached to the inside of the panel, a frame installed inside the panel and holding a shadow mask, an end fixed to the frame, and an insertion hole at the other end. Is provided, and the projection is inserted through the insertion hole, and is engaged with the side surface of the projection by a pressing force due to an elastic restoring force, thereby supporting the frame to the panel. A locking member fixed to the elastic support so as to close a part of the insertion hole, thereby preventing the protrusion from coming out of the insertion hole.

According to a second aspect of the present invention, in the color cathode ray tube according to the first aspect, the elastic support engages with a portion of the side surface of the projection adjacent to the projection.

According to a third aspect of the present invention, in the color cathode ray tube according to the first or second aspect, the locking member has a cross section in which the projection and the projection are combined at a portion where the projection projects. It has an insertion hole shaped like a shape.

According to a fourth aspect of the present invention, in the color cathode ray tube according to any one of the first to third aspects, the cross-sectional shape of the protrusion is circular, and the shape of the insertion hole of the elastic support is: A circular portion that contacts the side surface of the projecting portion of the panel pin; and a portion of the circumference of the circular portion that corresponds to the opposite side to the projecting portion of the panel pin protrudes in an elliptical shape along the radial direction. And an oval shape having a portion.

According to a fifth aspect of the present invention, there is provided a manufacturing method comprising
The method for manufacturing a color cathode ray tube according to any one of the inventions, wherein (a) the projection of the panel is inserted into the insertion hole of the elastic support having the one end fixed to the frame holding the shadow mask. (B) engaging the elastic support with the side surface of the protrusion with the pressing force of the elastic restoring force of the elastic support, thereby supporting the frame on the panel. The process
(a) after the step of removing the elastic support from the panel pin by pulling out the projection of the panel pin from the insertion hole of the elastic support, (c) the step (a) and the step (b) performing the step (a) again after the combination with (b) has been performed at least once;
(c) fixing the locking member to the elastic support so as to prevent the protrusion from coming out of the insertion hole by closing a part of the insertion hole.

[0011]

1 to 7 show a mounting structure between a panel 4 and a color selection mechanism assembly 7 in a color cathode ray tube according to an embodiment of the present invention. More specifically, FIG. 1 is a rear view depicting the inside of the panel of the color cathode ray tube before the funnel is connected, and FIG. 3 is a perspective view of the panel pin 3, the elastic support 2, and the locking member 1 in a state where the panel pin 3 is attached to each other, and FIG. 4 is a perspective view of the panel pin 3 and the elastic support 2. FIG. 5 is a plan view of the locking member 1 and FIG. 5 is a sectional view taken along line II-II of FIG. 1 in a state where the locking member 1 is not attached.
FIG. 7 is a sectional view taken along line II-II of FIG. 1 in a state where the locking member 1 is attached, and FIG. 7 is a sectional view showing a part of FIG. 6 in an enlarged manner. In FIGS. 1 to 7, the same reference numerals are given to the device elements which are formed the same as the device elements according to the prior art shown in FIGS.

The panel 4 has a face portion 5 and a skirt portion 6. The color selecting mechanism assembly 7 includes a shadow mask 1 having a thin metal plate having an electron beam transmitting hole 11 formed therein.
0, a frame 9 having a metal plate thicker than the thin metal plate and holding a shadow mask 10, and an elastic support 2 provided at a corner portion of the frame 9. In addition,
FIG. 1 shows only a part of the electron beam transmitting hole 11 for convenience of drawing.

The panel pin 3 has a protruding portion in the shape of a truncated cone, and a protruding portion 3a is provided on a portion of the conical side surface close to the tip. The panel pin 3 has a trapezoidal conical protruding portion inside each of the four corners of the skirt portion 6 protruding toward the inside of the panel 4, and the protruding portion 3 a is arranged in the tube axis direction of the color cathode ray tube. 1 toward the face portion 5 side (that is, from the near side to the far side in FIG. 1).
It is attached to project.

The elastic support 2 is made of a metal plate, has a free end 2a and a fixed end 2b, and extends along the tube axis of the color cathode ray tube. The other end of the free end 2a and the other end of the fixed end 2b are connected to each other such that one end of the free end 2a and one end of the fixed end 2b face each other. The other end of the fixed end 2b is fixed to a corner of the frame 9. The other end of the free end 2a is the insertion hole 2
c and engages with elastic pressing force on the conical side surface of the panel pin 3 inserted into the insertion hole 2c. Thereby, the frame 9 is supported on the panel 4.

The locking member 1 is made of a metal plate and has a flat plate shape, and has an insertion hole 1a for inserting the panel pin 3 at the center. The locking member 1 is fixed to the elastic support 2 so that the elastic support 2 interferes with the protrusion 3a, and thereby plays a role of preventing the elastic support 2 from coming off the panel pin 3.

The shapes of the insertion hole 1a of the locking member 1 and the insertion hole 2c of the elastic support 2 are depicted in detail in FIGS. The insertion hole 1a has a Dharma shape having a short diameter d1 and a long diameter d2. That is, the insertion hole 1a is
It has a shape that resembles a cross-sectional shape of a portion of the panel pin 3 where the protruding portion 3a protrudes and the protruding portion 3a in combination with the conical portion.

More specifically, the insertion hole 1a has a circular portion through which a trapezoidal cone-shaped portion of the panel pin 3 can pass, and a notch projecting radially from a part of the circular portion so that the projection 3a can pass through. 1b. The diameter of the circular portion corresponds to the minor diameter d1, and the notch-shaped portion 1
The sum of the heights of b corresponds to the major axis d2.

The insertion hole 2c has an oval shape having a major axis d3 and a minor axis d4. More specifically, the insertion hole 2c is
It has a circular portion that comes into contact with the conical side surface of the panel pin 3 and a portion that protrudes in a radial direction from a part of the circular portion along the radial direction. The diameter of the circular portion corresponds to the minor axis d4,
The sum of the diameter of the circular portion and the height protruding in an oval shape corresponds to the long diameter d3. The oval portion protrudes in the radial direction on the side opposite to the protrusion 3a.

The sectional shape of the panel pin 3 in a section perpendicular to the trapezoidal conical axis and including the projection 3a is a major axis d5.
And a short diameter d6. More specifically, this cross-sectional shape has a circular portion corresponding to the cross section of the truncated cone shape of the panel pin 3 and a portion corresponding to the cross section of the projection 3a. The diameter of the circular portion corresponds to the minor diameter d6, and the sum of the diameter of the circular portion and the height of the protrusion 3a corresponds to the major diameter d5.

Between the major axis and the minor axis, d3>
The relationships d2> d5 and d4>d1> d6 are set. As a result, the elastic support 2 is
Can be inserted through the insertion hole 2c, and can be further engaged with the side closer to the bottom of the truncated cone than the projection 3a. Further, the locking member 1 is provided with a projection 3a.
Can be inserted through the insertion hole 1a.

The elastic support 2 is engaged with the panel pin 3,
The details of the step of fixing the locking member 1 to the elastic support 2 are as follows. In the manufacturing process of the color cathode ray tube according to the present embodiment, in the process of forming a black matrix pattern on the face portion 5 of the panel 4, the process of forming phosphor pixels for each color, etc. 7 is repeated.

When the color selection mechanism assembly 7 is mounted on the panel 4, the projection 3a of the panel pin 3 is inserted into the insertion hole 2c provided in the flat portion of the free end 2a of the elastic support 2. As a result, the free end 2a of the elastic support 2 is engaged with the conical side surface of the panel pin 3 by the elastic pressing force of the elastic support 2 (FIGS. 5 to 7). By displacing the center axis of the trapezoidal conical shape of the panel pin 3 from the center of the circular portion having the diameter of the short diameter d4 of the insertion hole 2c in the direction in which the panel pin 3 protrudes in an oval shape along the long diameter d3. 3a can be inserted through the insertion hole 2c (FIG. 2).

In the step of forming a black matrix pattern on the face portion 5 of the panel 4 and the step of forming phosphor pixels for each color, the face portion 5
Is installed upward along the vertical axis, so panel 4
The color selection mechanism assembly 7 incorporated in the camera moves downward along the vertical axis by its own weight. At this time, since the elastic support 2 inserted into the panel pin 3 also moves downward along the vertical axis similarly to the color selection mechanism assembly 7, the circular portion having the short diameter d4 in the insertion hole 2c has a diameter. Contact the conical side surface. That is, the trapezoidal conical center axis of the panel pin 3 is located at the center of the circular portion having the minor axis d4 as the diameter (FIG. 7). Thereafter, even if the direction of the panel 4 and the color selection mechanism assembly 7 is changed, the elastic support 2
By the action of the elastic restoring force, the position of the center axis of the trapezoidal cone of the panel pin 3 is held at the center of the circular portion having the minor diameter d4 in the insertion hole 2c. That is, the elastic support 2 is stably engaged with the predetermined portion of the panel pin 3 throughout the manufacturing process.

In the step of forming a black matrix pattern on the face portion 5 of the panel 4 and the step of forming phosphor pixels for each color, the attachment and detachment between the panel 4 and the color selection structure assembly 7 are repeated. . When the color selection structure assembly 7 is detached from the panel 4, the elastic support 2 is elastically deformed so that the projection 3a of the panel pin 3 is pulled out of the insertion hole 2c. Removed from panel pin 3. This process is also performed in Panel 4
As in the step of mounting the color selection mechanism assembly 7, the operation can be easily performed.

After the color selection mechanism assembly 7 is mounted on the panel 4 at the end of the repetition of the detachment, the locking member 1 is attached to the free end 2a of the elastic support 2 (FIGS. 3 and 6).
And FIG. 7). The locking member 1 is configured such that the notch-shaped portion 1b is oriented in the same radial direction as the projection 3a, and the trapezoidal conical portion of the panel pin 3 is inserted into the insertion hole 2c together with the projection 3a, so that the free end portion is formed. It is possible to easily overlap the flat portion 2a. After being superimposed on the flat portion of the free end 2a, the locking member 1 is fixed to the free end 2a by, for example, spot welding. A black triangle in FIG. 7 shows an example of a spot welding portion.

As a result of the locking member 1 being fixed to the elastic support 2, a part of the insertion hole 2c of the free end 2a is closed by the locking member 1. More specifically, a portion or a part of the insertion hole 2c that protrudes in an oval shape along the long diameter d3 from the center of a circular portion having a diameter of the short diameter d4, or a part thereof, is covered by the locking member 1. . In other words, the insertion hole formed by the overlap of both the insertion hole 1a of the locking member 1 and the insertion hole 2c of the free end portion 2a has a short diameter d2 (FIG. 4 (a)) that is approximately equal to the diameter. And a short diameter d4 (FIG. 4).
(b)) and a semicircle having a diameter, which is smaller than the major diameter d5 of the panel pin 3 (FIG. 4 (c)).

As a result, the center axis of the truncated cone is sufficiently displaced from the center of the circular portion having the diameter of the short diameter d4 of the insertion hole 2c in the direction protruding into an oval shape along the long diameter d3. And the protrusion 3a cannot escape from the insertion hole 2c. That is, even if an external impact or the like is applied, the free end 2 of the elastic support 2 is locked by the projection 3 a of the panel pin 3, so that the elastic support 2 cannot come off the panel pin 3. Further, as described above, the insertion hole 1a of the locking member 1 has a cross-sectional shape in which the trapezoidal conical portion of the panel pin 3 and the projection 3a are combined. The range in which the elastic support 2 shifts in the direction perpendicular to the axis of the panel pin 3 is narrowly limited. That is, the displacement of the engagement position is suppressed.

As shown in FIG. 7, there is a gap between the free end 2a and the projection 3a in a state where the free end 2a is engaged with the panel pin 3 by the pressing force of the elastic restoring force. Is also good. Even if the engagement position between the free end 2a and the panel pin 3 is displaced in the direction along the axis of the panel pin 3 due to the application of an impact or the like from the outside, the displacement is determined as described above. It can be suppressed to the range of the gap. Thus, after the locking member 1 is fixed to the free end 2a, the engagement relationship between the elastic support 2 and the panel pin 3 is further stabilized. In addition, by setting each major axis and each minor axis such that the elastic support 2 engages with a portion of the conical side surface of the panel pin 3 adjacent to the projection 3a, the gap can be set narrow. Therefore, it is possible to further suppress the displacement of the engagement position.

The panel 4 incorporating the color selection mechanism assembly 7 is then welded to a funnel having an electron gun incorporated in the neck using a glass material. And then
The color cathode ray tube is completed through an exhaust process and the like. In the color cathode ray tube of the present embodiment manufactured as described above, the flat portion of the free end 2 of the elastic support 2 is locked by the projection 3a of the panel pin 3 as described above. The performance is improved.

Modified example. (1) It is desirable that the locking member 1 has an insertion hole 1a, but without providing the insertion hole 1a, for example, a panel pin 3
A plate having a semi-circular cut along the cross section of the conical side surface, a plate having no cut, or a plate other than a plate closes a part of the insertion hole 2c of the free end 2a. As long as the member can be fixed to the elastic support 2, a corresponding effect can be obtained.

(2) It is desirable that the projection of the panel pin 3 has a truncated cone shape in terms of ease of manufacture, stability of engagement, and the like. However, in general, a tapered projection having an arbitrary cross section may be used. The effect that the elastic support 2 engages the side surface of the protruding portion with the pressing force due to the elastic restoring force can be obtained.

[0032]

According to the first aspect of the present invention, the elastic support is engaged with the side surface of the projecting portion of the panel pin by the pressing force due to the elastic restoring force of the elastic support, and furthermore, the locking member is provided so that the projecting portion does not come off. Closes a part of the insertion hole, so that even if an external impact is applied, the elastic support does not come off from the panel pin, and the displacement of the engagement position is suppressed.

In the device according to the second aspect of the present invention, since the elastic support engages with the portion of the side surface of the projection of the panel pin adjacent to the projection, the displacement of the engagement position of the elastic support due to the impact is further reduced. Is suppressed.

In the device according to the third aspect of the present invention, since the locking member has the insertion hole shaped like a cross section formed by combining the projection and the projection at the location where the projection projects, the displacement of the engagement position is further reduced. Effectively suppressed.

In the device according to the fourth aspect of the present invention, since the cross-sectional shape of the projecting portion of the panel pin is circular and the shape of the insertion hole of the elastic support is an oval shape set according to the shape of the panel pin, The body is stably engaged with the side surface of the projection of the panel pin by the elastic restoring force.

In the manufacturing method of the fifth invention, the step of engaging the elastic support with the side surface of the projecting portion of the panel pin by the pressing force due to the elastic restoring force of the elastic support, and the step of releasing the engagement thereafter. By repeating, attachment and detachment between the frame and the panel for performing a predetermined process can be easily repeated. In addition, since the projection is provided on the panel pin, when the elastic support is engaged with the panel pin, the engagement state is stabilized. Furthermore, in the last step in which it is not necessary to release the engagement, a part of the insertion hole is closed by the locking member so that the projection of the panel pin does not come out of the insertion hole of the elastic support. Is applied, the elastic support does not come off from the panel pin, and the displacement of the engagement position is suppressed.

[Brief description of the drawings]

FIG. 1 is a rear view illustrating the inside of a color cathode ray tube according to an embodiment.

FIG. 2 is a perspective view of the color cathode ray tube of FIG. 1 before mounting members.

FIG. 3 is a perspective view of the color cathode ray tube of FIG. 1 after mounting members.

FIG. 4 is a plan view of members of the color cathode ray tube of FIG. 1;

FIG. 5 is a sectional view taken along line II-II of FIG. 1 before attaching a locking member.

FIG. 6 is a cross-sectional view taken along line II-II of FIG. 1 after attaching a locking member.

7 is a cross-sectional view showing a part of FIG. 6 in an enlarged manner.

FIG. 8 is a rear view depicting the inside of a conventional color cathode ray tube.

9 is a perspective view of the color cathode ray tube of FIG. 8 before the members are mounted.

FIG. 10 is a perspective view of the color cathode ray tube of FIG. 8 after the members are mounted.

11 is a sectional view taken along the line III-III in FIG.

[Explanation of symbols]

Reference Signs List 1 locking member, 1a insertion hole, 2 elastic support, 2c
Insertion hole, 3 panel pin, 3a projection, 4 panel,
9 frames, 10 shadow masks.

Claims (5)

[Claims] 1. A panel, comprising: a projection having a tapered shape and projecting toward the inside of the panel; and a projection projecting from a part of a side surface of the projection.
A panel pin attached to the inside of the panel, a frame installed inside the panel and holding a shadow mask, one end fixed to the frame, an insertion hole provided at the other end, and the projection formed by the insertion hole. And an elastic support that engages the side surface of the protruding portion with a pressing force due to elastic restoring force, thereby supporting the frame to the panel, and closing a part of the insertion hole. A color cathode ray tube comprising: a locking member fixed to the elastic support to prevent the protrusion from coming out of the insertion hole. 2. The color cathode ray tube according to claim 1, wherein the elastic support engages with a portion of the side surface of the protrusion adjacent to the protrusion. 3. The locking member according to claim 1, wherein the locking member has an insertion hole shaped in a cross-sectional shape in which the protrusion and the protrusion are combined at a position where the protrusion protrudes. Color cathode ray tube. 4. A cross-sectional shape of the projecting portion is circular, and a shape of the insertion hole of the elastic support is a circular portion that contacts the side surface of the projecting portion of the panel pin, and a circumference of the circular portion. 4. An oval shape having a portion protruding in an elliptical shape along a radial direction from a portion corresponding to a side opposite to the protrusion of the panel pin. Color cathode ray tube. 5. The method for manufacturing a color cathode ray tube according to claim 1, wherein: (a) the elastic support having the one end fixed to the frame holding the shadow mask. The projection of the panel is inserted into the insertion hole of the body, and the elastic support is engaged with the side surface of the protrusion by the pressing force of the elastic restoring force of the elastic support, whereby the frame is (B) after the step (a), by removing the projection of the panel pin from the insertion hole of the elastic support, thereby removing the elastic support from the panel pin. (C) performing the step (a) again after the set of the step (a) and the step (b) is performed at least once; and (d) performing the step (c). Later, by closing a part of the insertion hole, Serial insertion hole so that the protrusion does not come out, the production method of the color cathode ray tube comprising the steps of securing the locking member to the resilient support.