JPS5912541A - Sealing apparatus for cathode ray tube - Google Patents

Abstract

PURPOSE:To bring the axis of the neck portion and the axis of the stem portion in accurate alignment to enable correct sealing, by providing a first and second V-notch portions on one side of a supporting block having the same notch angles and being in alignment with each other, whereby the neck portion and the stem socket are supported by the first and second V-notch portions, respectively, to fit therein, so that the axis of the neck portion and that of the stem portion are kept in accurate alignment and correct sealing is made possible. CONSTITUTION:The supporting device 21 consists of the lower base plate 22, the supporting block 23, and the upper base plate 24. The supporting block 23 comprises the neck portion supporting block 25 and the stem socket supporting block 26, both the supporting blocks 25, 26 being made integral through the connecting block 27, and the same is fixedly disposed on the top surface of the lower base plate 22. On one side 25a, 26a of the supporting blocks 25, 26, there are provided V-notches 28, 29 having the same notch angles and being in alignment with each other. By this arrangement, the axis of the neck portion and that of the stem can be kept in accurate alignment to enable correct sealing.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a sealing device used for sealing the neck and stem of a cathode ray tube when manufacturing small cathode ray tubes such as those for viewfinders. The present invention relates to a sealing device configured to align the neck portion of the cathode ray tube with the axis of the stem with high precision.

BACKGROUND TECHNOLOGY AND PROBLEMS Generally, one of the steps in manufacturing cathode ray tubes is to seal a stem on which a cand is arranged to the neck of the cathode ray tube in a vacuum atmosphere to encapsulate the cand. There is. In the above-mentioned sealing process, it is necessary to align the axes of the neck portion of the cathode ray tube and the stem with high precision. That is, in order to prevent image deterioration due to deviation in the direction of the beam irradiated onto the screen surface of the cathode ray tube, the beam direction needs to be exactly perpendicular to the screen surface.

In the above-mentioned sealing process, when manufacturing a large quantity of small cathode ray tubes, a sealing device having a support device configured as shown in FIG. 1 is conventionally known as a device for holding cathode ray tubes and stems. There is.

To explain the above conventional example according to the drawings, a support device 1 constituting a sealing device includes an upper base plate 3 that holds a cathode ray tube 2.
and a lower base plate 5 that holds the stem 4. The upper surface side of both ends 5a and 5b of the lower base plate 5 is
Yafts 697 are arranged vertically. On the other hand, the above reference/yaft 6. A slide hole 8.9 is opened at a position opposite to γ, and the springs 10 and 11 are inserted into the reference shaft 6.1 to enable reciprocating movement in the vertical direction Q in the figure. Further, the upper pace plate 3 has a circular cathode ray tube neck insertion hole 12. On the upper end surface of the upper base plate 3, a fixed Glock 13 having four V-shaped parts 13a on the negative side is attached to the V-shaped recess 1.
3ak is arranged so as to circumscribe the insertion hole 12 of the above-mentioned I-tsuk part. Further, a movable valve plate 14 is movably provided at a position facing the fixed block 13 and the neck insertion hole 12 between them. Therefore, by inserting the neck portion 2a't of the cathode ray tube 2 into the neck insertion hole 12 and being pressed against the fixed block 13 by the movable valve plate 14, the cathode ray tube 2 is attached to the upper base plate 3. It can be held fixed.

On the other hand, on the lower base plate 5, a stem retainer 15 for holding the stem 4 is located at a position coaxially facing the open end 2b of the neck portion 2a of the cathode ray tube 2 held on the upper base plate 3. The stem 4 is held on the upper end surface of the stem socket 15.

Therefore, in the conventional sealing device, the above-mentioned support devices 1 are arranged in parallel in a vacuum atmosphere, and arranged on the stem 4.
Frisox, which is a fine powder of low melting point solder glass, is melted by a high frequency coil (not shown), and the open end 2b of the cathode ray tube 2 and the stem 4 are bonded by pushing down the upper base plate 3 along the reference shaft 6 and γ. It is possible to seal it.

However, in the above conventional example, since the upper base plate 3 and the lower base plate 5 are molded separately, misalignment easily occurs between the insertion hole 12 of the neck portion 2a and the axis of the stem holder 15, and the reference shaft 6 7 and the slide holes 8 and 9 of the upper base plate 3, it is difficult to align the axis of the open end 2b of the neck portion 2a with the axis of the stem 4 with high precision. Ta.

Purpose of the Invention In view of the above-mentioned circumstances, the present invention provides a cathode ray tube sealing device having a support device capable of aligning and sealing the axis of the neck portion of the cathode ray tube with the axis of the stem with high precision. SUMMARY OF THE INVENTION In order to achieve all of the above objects, the cathode ray tube sealing device of the present invention includes a first V in which the neck portion of the cathode ray tube is fitted and held on one side of the support block. The second V-shaped four parts, in which a stem socket having the same diameter as the neck part that holds the stem sealed to the open end of the neck part are fitted and held, are connected to the first V-shaped recess part. The neck portion of the cathode ray tube is arranged in a straight line with the same notch angle as the recess, and is held in the first V-shaped recess, and the neck portion is held in the second V-shaped recess. Embodiment 0 Hereinafter, embodiments of the present invention will be described with reference to the drawings.This embodiment is characterized by having a support device for a cathode ray tube and a stem tube held coaxially and facing each other.

2 and 3 (A) and 3 (B) show an embodiment of the present invention, the support device 21 in the sealing device for a cathode ray tube includes a lower base plate 22, a support block 23 and It consists of an upper base plate 24. The support block 23
consists of a neck holding Glock 25 and a stem holding Glock 26. Each holding block 25, 26 is integrally formed with a connecting block 27, and is fixedly arranged on the upper end surface of the lower base plate 22. . On one side 25a, 26a of each of the holding grokks 25°26, there is a V
The V-shaped recesses 28, 29 are provided so that the V-shaped recesses 2B, 29(l'' are connected in a straight line with the same notch angle. Recess 2
8 and 29 are simultaneously cut by a cutting machine based on the same standard.

A substantially U-shaped presser spring 30 is pivotally supported at an end portion 30a in the middle of the V-shaped four portions 28 of the neck holding Glock 25 so as to be openable and closable. Further, an eye-piece insertion hole 31 is formed in the upper base plate 24 at a position facing the V-shaped recess 28 of the neck holding groove 25.

Therefore, it is possible to insert the neck portion 42 of the cathode ray tube 41 held on the upper base plate 24 into the V-shaped recess 28 of the neck portion holding block 25 and close the presser spring 30.
C, the cathode ray tube 41 is held slidably in the vertical direction.

On the other hand, the V-shaped recess 2 of the stem lock holding Glock 25
A stem tube 32 having the same diameter as the neck portion 42 of the cathode ray tube 41 is fitted into the tube 8, and is pressed and fixed by an L-shaped spring 33 movably disposed on the lower base plate 22. A stem 44 is held on the upper end surface of the stem socket 32 so as to be coaxially opposed to the open end 43 of the blank portion 42 of the cathode ray tube 41 .

Therefore, in the pricking device of this embodiment, the above-mentioned support devices 21 are arranged in parallel in a vacuum atmosphere, and a high-frequency coil (not shown) is attached to the Flynn+, which is fine powder of low-melting solder glass, arranged on the upper end surface of the stem 44. By pressing down the upper base plate 24, the ink part 42 of the cathode ray tube 41 is slid downward along the V-shaped recess iηβ2 of the ink part support block 25, and the above-mentioned The open end 43 of the neck portion 42 and the stem 44 can be brought into contact and sealed.

In the above embodiment, each of the V-shaped recesses 28 and 2 of the neck holding Glock 25 and the Stemkent holding Glock 26 is
Since the neck part 9 is formed by cutting at the same time, the neck part 4
The central axis of the stem 44 and the central axis of the stem 44 are coaxially arranged with high precision, making it possible to seal the stem 44 without causing positional deviation.

The present invention is not limited to the above-mentioned embodiments, and for example, a supporting glock may be used in which a V-shaped recess is provided in a straight line on one side of a rectangular parallelepiped glock, without separating the grip-holding glock and the stem-holding glock. Similar effects can be obtained even if configured as follows.0 Effects of the Invention In the sealing device of the present invention, 1. By having a supporting device in which the neck portion of the cathode ray tube and the holding portion of the stem are integrally molded, it becomes possible to align and seal the axis of the neck portion and the axis of the stem with high precision.

[Brief explanation of the drawing]

FIG. 1 (1) is an external perspective view showing a conventional example; FIG. 2 is an external perspective view showing an embodiment of the present invention; FIGS. Figure 3 (A is a plan view, Figure 3 CB) is a side view. 21... Support device 25... Neck holding Glock 26mm
・ ・・・ Stemunknoto holding Gronk 28.29
... V-shaped recess 32 - ... 11 @ letter Stemken Kent Patent Applicant
N21 Co., Ltd. Agent Patent Attorney Koike Mimuki 1) Sakae Mura - Figure 1

Claims (1)

[Claims] On one side of the support block, a first V-shaped four part into which the neck part of the cathode ray tube is fitted and held, and a stem having the same diameter as the neck part which holds a stem sealed to the open end of the neck part. A second V-shaped recess into which the stem lock is fitted and held is provided so as to be continuous in a straight line with the same notch angle as the first V-shaped recess, and is held in the first V-shaped recess. A cathode ray tube sealing device having a cathode ray tube and a stem support device in which the neck portion of the cathode ray tube and the stem tube held in the second V-shaped recess are held so as to coaxially face each other. .