JPH0419657B2 - - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a sealing device used for sealing a neck portion and a stem of a cathode ray tube when manufacturing a small cathode ray tube for viewfinder use, etc. The present invention relates to a sealing device configured to align the axis of the neck portion of the cathode ray tube with the axis of the stem with high precision.

BACKGROUND TECHNOLOGY AND PROBLEMS Generally, as a step in manufacturing cathode ray tubes, a step is performed in which a stem on which a cathode is disposed is sealed in a vacuum atmosphere to encapsulate the cathode. There is. In the above sealing step, 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.

The above conventional example will be explained with reference to the drawings. A support device 1 constituting a sealing device is composed of an upper base plate 3 for holding a cathode ray tube 2 and a lower base plate 5 for holding a stem 4. Both ends 5 of the lower base plate 5
Reference shafts 6 and 7 are vertically disposed on the upper surface sides of a and 5b. On the other hand, slide holes 8 and 9 are formed in the upper base plate 3 at positions facing the reference shafts 6 and 7, and these are inserted into the reference shafts 6 and 7 via springs 10 and 11, and are inserted into the reference shafts 6 and 7 in the upper and lower positions in the figure. It is possible to reciprocate in the direction. Furthermore, a cathode ray tube neck insertion hole 12 is formed in the upper base plate 3 in a circular shape. A fixing block 13 having a V-shaped recess 13a on one side is disposed on the upper end surface of the upper base plate 3 so that the V-shaped recess 13a circumscribes the neck insertion hole 12. .
In addition, the above-mentioned fixing block 13 and the neck insertion hole 1
A movable holding plate 14 is movably provided at a position opposite to the holding plate 2 . Therefore, cathode ray tube 2
Insert the neck part 2a into the neck part insertion hole 12,
By being pressed against the fixed block 13 by the movable holding plate 14, the cathode ray tube 2 can be fixedly held on the upper base plate 3.

On the other hand, on the lower base plate 5, a stem socket 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 the flux, which is a fine powder of low melting point solder glass arranged on the stem 4, is melted by a high frequency coil (not shown). By pushing down the upper base plate 3 along the reference shafts 6 and 7, it is possible to seal the open end 2b of the cathode ray tube 2 and the stem 4.

However, in the above conventional example, in order to mold the upper base plate 3 and the lower base plate 5 separately,
Insertion hole 12 of neck part 2a and stem socket 15
The axis of the open end 2b of the neck portion 2a and the stem 4 are likely to be misaligned, and the gap between the reference shafts 6, 7 and the slide holes 8, 9 of the upper base plate 3 has an effect. It was difficult to align the axis with high precision.

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. The purpose is to

SUMMARY OF THE INVENTION In order to achieve the above object, the cathode ray tube sealing device of the present invention has a
A first V-shaped recess into which a neck portion of a cathode ray tube is fitted and held, and a stem socket having the same diameter as the neck portion which holds a stem sealed to an open end of the neck portion are fitted and held. A second V-shaped recess is provided so as to be continuous in a straight line with the same notch angle as the first V-shaped recess, and the neck portion of the cathode ray tube held in the first V-shaped recess is The stem socket held in the second V-shaped recess has a supporting device for the cathode ray tube and the stem socket, which are held coaxially and facing each other.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. 2 and 3A and 3B show an embodiment of the present invention, a support device 21 in a cathode ray tube sealing device includes a lower base plate 22, a support block 23, and an upper base plate 24. It consists of The support block 23 is the neck holding block 2
5 and a stem socket holding block 26, each holding block 25, 26 is connected to the connecting block 2.
7, and is fixedly disposed on the upper end surface of the lower base plate 22. V-shaped recesses 28 and 29 are provided in one side surface 25a and 26a of each of the holding blocks 25 and 26, respectively, and the V-shaped recesses 28 and 29 are connected in a straight line with the same notch angle. It is set up so that That is, the V-shaped recesses 28 and 29 are simultaneously cut by a cutting device based on the same standard.

V-shaped recess 2 of the neck holding block 25
8, a substantially U-shaped presser spring 30 is pivotally supported at an end portion 30a so as to be openable and closable. Also, the V of the neck portion holding block 25 of the upper base plate 24 is
A neck insertion hole 31 is provided at a position facing the letter-shaped recess 28.

Therefore, by inserting 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 closing the presser spring 30, the cathode ray tube 41 is held slidably in the vertical direction.

On the other hand, a stem socket 32 having the same diameter as the neck part 42 of the cathode ray tube 41 is fitted into the V-shaped recess 28 of the stem socket holding block 25, and is supported by an L-shaped spring 33 movably disposed on the lower base plate 22. Fixed by pressure. Above stem socket 32
A stem 44 is held on the upper end face of the cathode ray tube 41 so as to coaxially face the open end 43 of the neck portion 42 of the cathode ray tube 41.

Therefore, in the sealing device of this embodiment, the above-mentioned support devices 21 are arranged in parallel in a vacuum atmosphere, and the flux, which is fine powder of low melting point solder glass arranged on the upper end surface of the stem 44, is exposed to a high frequency wave (not shown). By melting the coil and pushing down the upper base plate 24, the neck portion 42 of the cathode ray tube 41 is melted.
By sliding downward along the V-shaped recess 28 of the neck support block 25, the open end 43 of the neck 42 and the stem 44 can be brought into contact and sealed.

In the above embodiment, the V-shaped recesses 28 and 29 of the neck holding block 25 and the stem socket holding block 26 are formed by cutting simultaneously, so that the central axis of the neck 42 and the central axis of the stem 44 are aligned. They are coaxially arranged with high precision, making it possible to seal them without causing positional deviation.

The present invention is not limited to the above-mentioned embodiments, and may be configured, for example, as a support block in which a V-shaped recess is provided in a straight line on one side of a rectangular parallelepiped block without separating the neck portion holding block and the stem socket holding block. The same effect can be obtained.

Effects of the Invention In the sealing device of the present invention, since the neck portion of the cathode ray tube and the holding portion of the stem are provided with a supporting device integrally molded, the axial center of the neck portion and the axial center of the stem are aligned with high precision. It becomes possible to seal it by letting it do so.

[Brief explanation of drawings]

Fig. 1 is an external perspective view showing a conventional example, Fig. 2 is an external perspective view showing an embodiment of the present invention, and Figs. 3 A and B.
Similarly, FIG. 3A is a plan view and FIG. 3B is a side view of the support block. 21...Support device, 25...Neck portion holding block, 26...Stem socket holding block, 2
8, 29... V-shaped recess, 32... Stem socket.

Claims (1)

[Claims] 1 A first V-shaped recess into which the neck of the cathode ray tube is fitted and held on one side of the support block, and a neck having the same diameter as the neck which holds the stem sealed to the open end of the neck. A second V-shaped recess into which the stem socket 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 Sealing of a cathode ray tube having a support device for a cathode ray tube and a stem socket, in which a neck portion of a cathode ray tube held and a stem socket held in a second V-shaped recess are coaxially opposed to each other. Device.