JPH0757634A - Electron gun sealing device - Google Patents

Abstract

PURPOSE:To prevent an electron gun from rotating to a mount pin after the electron gun is positioned in the rotating direction, and seal/fix the electron gun in/to an accurate position of a cathode-ray tube by arranging a means to regulate rotation of the electron gun when the electron gun is sealed in a neck part of the cathode-ray tube. CONSTITUTION:A cathode-ray tube 3 is supported upward with a plurality of head parts 2 arranged in a peripheral part of a turntable 1, and an electron gun 4 is set on a lower mount pin 5. The turntable 1 is rotated by a prescribed angle, and the electron gun 4 is positioned in the rotating direction. Next, a head part 2 moves to a position where the electron gun 4 is inserted in a neck part 2 by rotation of the turntable 1, and the mount pin 5 rises, and the electron gun 4 is inserted in the neck part 6 of the cathode-ray tube 3. In this case, since a rotation regulating means composed of a recessed part and a rotation regulating pin is arranged on the mount pin 5, the electron gun 4 can be prevented from rotating to the mount pin 5, so that the electron gun can be sealed accurately in a correct position of the cathode-ray tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun sealing device, particularly an electron gun supported by mount pins, which is positioned in the rotational direction and then inserted into the neck portion of a cathode ray tube to seal the neck portion. The present invention relates to an electron gun sealing device in which the electron gun is welded to a neck portion by heating.

[0002]

2. Description of the Related Art An electron gun sealing step is one of the indispensable steps in manufacturing a cathode ray tube. This is performed by inserting an electron gun into the neck portion of a funnel having a cathode ray tube panel fixed to the front surface and heating the sealed portion of the neck portion from the periphery to weld the electron gun.

FIGS. 4A, 4B, and 4C are side views sequentially showing a part of the work performed by the electron gun sealing device. Reference numeral 1 denotes a turntable having a plurality of heads 2 arranged at the periphery thereof, each head 2 supporting a cathode ray tube 3 in an upward direction, and a mount pin 5 supporting an electron gun 4 therebelow. The turntable 1 rotates and each head unit 2 changes its position, so that a series of processing for sealing progresses.

FIG. 4A shows a state in which the cathode ray tube 3 is set on the head portion 2 and an electron gun (bead glass is not shown for convenience) 4 is set below the cathode ray tube 3 by a mount pin 5. Next, when the turntable 1 is rotated by a predetermined angle, the head part 2 in which the setting of the electron gun 4 has been completed comes to a position for positioning in the rotational direction.
Then, as shown in FIG. 4B, the electron gun 4 is rotated to perform positioning in the rotation direction. What is important in fixing the electron gun 4 to the neck portion 6 of the cathode ray tube 3 is that the central axis of the cathode ray tube 3 and the central axis of the electron gun 4 coincide with each other, and
That is, the positioning in the rotation direction of is accurately performed. Especially in a color cathode ray tube, if the positioning in the rotational direction is not accurate, the color purity and the landing characteristics will deteriorate, so positioning in the rotational direction is extremely important. Positioning in the rotational direction is performed by providing holes in the electron gun grid through which light passes at two locations, and rotating the electron gun in a direction in which light for position detection is passed through the two holes.

Then, after the positioning in the rotational direction is completed, the turntable 1 is rotated by a predetermined angle and the head portion 2 is moved to a position where the electron gun is inserted into the neck portion, as shown in FIG.
As shown in (C), the mount pin 5 is raised and the electron gun 4 is inserted into the neck portion 6 of the cathode ray tube 3.
Then, although not shown, sealing by heating is performed thereafter.

FIG. 5 (A) is a sectional view showing a conventional example of a mount pin, and FIG. 5 (B) is an enlarged sectional view of a part of which is enlarged. Reference numeral 7 is a stem forming a base portion of the exhaust pipe 8 of the electron gun 4, and outer pins 9, 9, ... Are fixed to the stem 7 in a penetrating manner. Reference numeral 10 is a central hole of the mount pin 5, in which the exhaust pipe 8 on the side of the electron gun 4 fits. , 11 are pin accommodating holes provided in the mount pin 5 corresponding to the outer pins 9, 9, ... Of the electron gun 4, and the mount pin 5 is an outer hole in the pin accommodating holes 11, 11 ,. The electron gun 4 is supported with the pins 9, 9, ... Reference numeral 12 is a receiving surface for receiving the tips of the outer pins 9, 9, .... The diameter of each pin receiving hole 11, 11, ... Is larger than that of the outer pins 9, 9 ,. Otherwise, all the outer pins 9, 9, ... Can not be inserted into the corresponding pin receiving holes 11, 11 ,.

[0007]

By the way, according to the conventional mount pin shown in FIG. 5, after the mount pin 4 is positioned in the rotation direction [see FIG. 4 (B)], the mount pin 4 is mounted on the cathode ray tube 3. When inserting it into the neck 6 of the
(See (C)], the mount pin 4 often rotates. It has been found that the rotation occurs because the diameter of the pin housing holes 11, 11, ... Is larger by 0.2 mm than that of the outer pins 9, 9 ,. The rotation caused by such rattling has not been a problem before because the rotation angle is small, but it cannot be overlooked as the rotation allowable error of the electron gun becomes smaller as the resolution becomes higher, the image quality becomes higher, and the screen becomes larger. There is.

The present invention has been made to solve such a problem, and an object thereof is to prevent the electron gun from rotating with respect to the mount pin after the position of the electron gun in the rotational direction is determined. .

[0009]

An electron gun sealing device according to a first aspect of the present invention is characterized in that the mount pin is provided with rotation restricting means for restricting rotation of the supported electron gun. According to a second aspect of the present invention, in the electron gun sealing device according to the first aspect, the rotation restricting means comprises a concave portion having a V-shaped cross section provided in a portion for receiving a tip of an outer pin of the electron gun. To do. According to a third aspect of the present invention, in the electron gun sealing device according to the first aspect, the rotation restricting means comprises a rotation restricting pin fitted in a hole formed in a centripetal direction between pin through holes through which outer pins of the electron gun pass. It is characterized by

[0010]

According to the electron gun sealing device of the first aspect, since the mount pin is provided with the rotation restricting means, there is no fear that the electron gun rotates with respect to the mount pin after the positioning in the rotational direction. Therefore, it is possible to prevent the electron gun from rotating with respect to the mount pin after the electron gun is positioned in the rotation direction. According to the electron gun sealing device of the second aspect, the sectional shape V provided at the position where the rotation restricting means receives the tip of the outer pin.
Since it consists of a V-shaped recess, when the electron gun is set on the mount pin, the tip of the outer pin fits in the V-shaped recess of the cross section, and the tip position of the outer pin is fixed without rattling. The rotation of the gun relative to the mount pin is completely restricted.

According to the electron gun sealing device of the third aspect, the rotation restricting means comprises the rotation restricting pin fitted in the hole formed in the centripetal direction between the pin through holes through which the outer pin passes.
When the electron gun is set on the mount pin, the position of the outer pin is defined by the rotation restriction pin, and by extension, the rotation of the electron gun with respect to the mount pin is completely defined.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The electron gun sealing device of the present invention will be described in detail below with reference to the illustrated embodiments. 1 (A) to 1 (C) show the essential parts of one embodiment of the electron gun sealing device of the present invention.
(A) is a sectional view, (B) is an enlarged sectional view in which a part of (A) is enlarged, and (C) is a plan view showing a concave portion which is a rotation restricting means. The mount pin 5a, which is the main part of the present electron gun sealing device, differs greatly from the conventional mount pin 5a shown in FIG. The common points and common points have already been described, so description thereof will be omitted and only different points will be described. Further, common parts are denoted by common reference numerals throughout the drawings.

In the drawing, reference numeral 13 is a recess formed in the receiving surface 12 for receiving the tip of the outer pin 9 of the mount pin 5, and has a conical shape in which the diameter decreases as the depth increases. The recess 13 is provided below each pin receiving hole 11,
The center 14 is located on an extension of the center line of the pin housing hole 11. The recess 13 is formed by the mount pin 5a.
This means that the cross section perpendicular to the centripetal direction has a V shape.

According to this electron gun sealing device, there is rattling of about 0.2 mm between each pin housing hole 11, 11, ... And the outer pin 9, 9 ,. , The tip portions of the outer pins 9, 9 ... Are fitted into the concave portions 13, 13, ... Having a V-shaped cross section and their positions are fixed, so that the electron gun 4 is held against the mount pin 4 without rattling. ing. Therefore, when the mount pin 5 is inserted into the neck 6 of the cathode ray tube 3 after positioning the electron gun 4 in the rotation direction by rotating the mount pin 5 [FIG.
(See (C)], it is possible to prevent the electron gun 4 from rotating with respect to the mount pin 5 and causing a rotation angle error of the electron gun 4 with respect to the cathode ray tube 3.

Table 1 below shows an electron gun for the mounted mount pin when the mount pin shown in FIG. 1 is used (Example) and when the conventional mount pin shown in FIG. 5 is used (Conventional example). The rotation angle is measured and the standard deviation σ [minute] is compared with the diffusion R [minute].

[0016]

[Table 1]

As is apparent from Table 1, according to this embodiment, the standard deviation σ is changed from 20.35 'to 10.38' by about 4.
It was possible to reduce the dispersion R by 9% and the dispersion R from 96.2 'to 33.9' by 65%. FIG. 2 shows a modification 13a of the recess. The recess 13a is the same as the recess 13 of FIG. 1 in that the cross section of the mount pin 5 at a right angle to the centripetal direction is V-shaped, but extends in the centripetal direction with respect to the center of the mount pin 5. 14a is its apex. Even if such elongated recesses 13a, 13a, ... Are formed, the respective recesses 1 are formed.
, 3a, 13a, ... only extend in the centripetal direction with respect to the center of the mount pin 5, so that rattling in the rotation direction of the electron gun 4 can be eliminated, and the function as the rotation restricting means is the recesses 13, 13. , ... are the same.

FIGS. 3A to 3C show a main part of another embodiment of the electron gun sealing device of the present invention, that is, a mount pin 5b. FIG. 3A is a plan view and FIG. FIG. 3C is a sectional view taken along the line C-C for showing the formation position of the hole fitted in the rotation restriction pin of FIG. In the mount pin 5b of this embodiment, the rotation restricting means has holes 15, 15, 1 formed in the centripetal direction between the pin through holes 11 through which the outer pin passes.
The rotation restricting pins 16, 16 and 16 are fitted in the pin 5.

.. (not shown in FIG. 3, see FIG. 1) are defined by the rotation restricting pins 16, 16, 16, so that the outer pins 9 and the pin accommodating holes 11 are formed. Even if there is rattling between the two, the rotation restricting pins 16, 16, 16 can regulate the rotation of the electron gun 4 without rattling. And the rotation regulation pin 16
Since the number is as small as three, the insertion of the outer pins 9, 9, ... Of the electron gun 4 into the respective pin storage holes 11, 11 ,.

[0020]

According to the electron gun sealing device of the first aspect of the invention, the mount pin is provided with a rotation restricting means for restricting the rotation of the supported electron gun. Therefore, according to the electron gun sealing device of the first aspect, since the rotation restricting means is provided on the mount pin, there is no fear that the electron gun rotates with respect to the mount pin after the positioning in the rotation direction. Therefore,
It is possible to prevent the electron gun from rotating with respect to the mount pin after positioning the electron gun in the rotation direction.

According to another aspect of the electron gun sealing device of the present invention, the rotation restricting means has a V-shaped recess in a cross section perpendicular to the centripetal direction of the mount pin provided at a portion for receiving the tip of the outer pin of the electron gun. It is characterized by consisting of. Therefore, according to the electron gun sealing device of the second aspect, since the rotation restricting means comprises the concave portion having a V-shaped cross section provided at a position for receiving the tip of the outer pin, the outer pin is set when the electron gun is set on the mount pin. Of the outer pin is fixed in the recess having a V-shaped cross section without rattling in the rotation direction, and the rotation of the outer pin with respect to the mount pin is completely restricted.

According to another aspect of the electron gun sealing device of the present invention, the rotation restricting means comprises a rotation restricting pin fitted in a hole formed in a centripetal direction between pin through holes through which the outer pin of the electron gun passes. To do. Therefore, according to the electron gun sealing device of the third aspect, the rotation restricting means is composed of the rotation restricting pin fitted into the hole formed in the centripetal direction between the pin through holes through which the outer pin passes, so that the mount pin has an electron. When the gun is set, the position of the outer pin is defined by the rotation restricting pin, and by extension, the rotation of the electron gun with respect to the mount pin is defined.

[Brief description of drawings]

1 (A) to 1 (C) show essential parts (mount pins) of one embodiment of an electron gun sealing device of the present invention.
(A) is a vertical cross-sectional view, (B) is an enlarged cross-sectional view in which a part of (A) is enlarged, and (C) is a plan view of a recess serving as a rotation restricting means.

FIG. 2 is a plan view showing a modified example of a recess.

3 (A) to 3 (C) show essential parts (mount pins) of another embodiment of the electron gun sealing device of the present invention.
Is a plan view, (B) is a vertical cross-sectional view, and (C) is a cross-sectional view taken along the line C-C for showing the formation position of the hole fitted in the rotation restriction pin of (B).

4A to 4C are side views sequentially showing a part of the work relating to the sealing.

5A and 5B show a main part (mount pin) of a conventional example, (A) is a longitudinal sectional view, and (B) is (A).
It is an expanded sectional view which expanded a part of FIG.

[Explanation of symbols]

 4 Electron Gun 5a, 5b Mount Pin 9 Outer Pin 13 Recess (Rotation Control Means) 15 Hole 16 Rotation Control Pin (Rotation Control Means)

Claims (3)

[Claims] 1. An electron gun supported by mount pins is positioned in the rotational direction, inserted into the neck portion of a cathode ray tube, and the sealing portion of the neck portion is heated to weld the electron gun to the neck portion. In the electron gun sealing device according to the present invention, the mount pin is provided with rotation restricting means for restricting rotation of the supported electron gun. 2. The rotation restricting means comprises a V-shaped concave portion in a cross section perpendicular to the centripetal direction of the mount pin provided at a portion for receiving the tip of the outer pin of the electron gun. The electron gun sealing device according to claim 1. 3. The electron gun seal according to claim 1, wherein the rotation restricting means comprises a rotation restricting pin fitted in a hole formed in a centripetal direction between pin through holes through which the outer pin of the electron gun passes. Stop device