JPS639099Y2 - - Google Patents

Description

[Detailed description of the invention] Fig. 1 is a side view illustrating a conventional color cathode ray tube device. A connected funnel 3 having a substantially pyramidal shape, a neck portion 4 made of a glass cylinder connected to the funnel 3, and an electron gun that generally generates a plurality of electron beams enclosed within the neck portion 4. 5. It consists of a base 6, which is a terminal for supplying various voltages for operating the electron gun 5.

When operating such a color cathode ray tube 1,
The deflection yoke 10 and the neck magnet 20 are connected to the neck part 4.
It is necessary to attach it to. The deflection yoke 10 is a magnetic device for deflecting an electron beam (not shown) from the electron gun 5 and directing it to a required portion of the fluorescent film provided on the inner surface of the panel 2, and is generally a funnel. It is attached near the connection part between 3 and the network part 4.

The net magnet 20 is deviated from the position necessary for the operation of the color cathode ray tube 1 as a whole or with respect to each other of the plurality of electron beams from the electron gun 5 (this "deviation" is mainly caused by assembly errors during the manufacture of the color cathode ray tube or It is used to magnetically compensate for the effects of external unnecessary magnetic fields in the area where the color cathode ray tube is operated, and is generally a disk-shaped ring magnetized in a special pattern. It consists of a plurality of shaped magnets 21 assembled together, and is attached to the neck portion by means of a suitable retaining ring 22.

The number of ring-shaped magnets 21 is six in an ordinary color cathode ray tube in which three electron guns are arranged in a row, and two of them have the property of bending the three electron beams by a certain angle as a whole. The other two beams generate a magnetic field of
It generates a magnetic field that bends the books by the same amount in opposite directions, and the last two sheets also bend the two on either side of the three electron beams by the same amount in the same direction. Each set of two pieces is magnetized to generate a magnetic field, and by adjusting the mutual angle around the neck portion 4 and the direction of the set of two pieces with respect to the color cathode ray tube 1, the above-mentioned The size and direction of the curl can be arbitrarily determined, and the desired correction can be made by adjusting the mounting angle (direction) of all six magnets.

This amount of correction, that is, the direction, is actually determined by the color cathode ray tube 1, the deflection yoke 10, and the net magnet 20.
is attached, and while operating these and looking at the screen displayed, the best position is determined based on the actual situation, and each ring-shaped magnet 21 of the net magnet 20 is usually fixed at its best position. It is.

However, this work requires skill and is difficult to automate, contributing to the increased cost of producing color cathode ray tubes.

Therefore, in recent years, a net magnet 20 as shown in FIG. 2 has been made from a single sheet of magnetic material.
This has come to be magnetized according to the state of the screen, that is, the state of the error to be corrected. This magnet material is generally a magnetic plate metal or a plastic magnet (plastic with magnetic material mixed in), which is wrapped around the neck part 4 by an appropriate method and fixed, and then partially fixed according to the amount of correction. An appropriate magnetizing machine is used to magnetize the material in the preferred direction. According to this method, it is possible to measure the state of the screen optically or electrically, calculate the necessary magnetization distribution from this, and automatically operate the magnetizer according to this, making it possible to perform a series of operations. It becomes possible to employ an automatic machine that performs the process all at once, which solves the above-mentioned difficulty in automation, and also saves magnet materials.

However, when this is executed, the following problems occur. That is, the material of the neck magnet 20 needs to be wrapped uniformly around the entire circumference of the neck part 4, but in the case of general color cathode ray tubes, the tolerance is about ±1 mm for a diameter of the neck part of about 30 mm. It is said that you do not get . Therefore, if the material to be wrapped around the neck portion 4 is prepared in advance to a certain rectangular size and a seam 23 is provided as shown in FIG. 2, the diameter of the neck portion may deviate from the designed value. If so, a gap or an overlap between the magnet materials will appear at the seam 23, and the amount of the gap will reach a maximum of about 3 mm, which will be a major cause of unsatisfactory characteristics.

Furthermore, magnetic material generally has some elasticity, but when it is wrapped around the neck part 4,
The end face tends to lift up due to the elastic force, and in some cases, the correction effect changes during long-term operation, which can easily become a problem.

To prevent this, it is possible to wrap tape around the outside of the magnet material, but such work is time-consuming, difficult to mechanize, and tends to increase costs.

In view of these circumstances, the present invention provides a neck magnet in which a cylindrical holder having a constant inner diameter is arranged around the neck portion, and a magnetic material is provided inside the cylindrical holder.

FIG. 3 shows a partially cutaway side view of a color cathode ray tube showing an embodiment of the present invention.

The magnet material 24 has a cylindrical shape, is made by bending a generally rectangular material into a cylindrical shape, and is held by a cylindrical holder 25. Cylindrical holding body 2
Reference numeral 5 is made of plastic or the like into a cylindrical shape, and its inner diameter is made constant. A plurality of elastic front tongue pieces 2 are provided at both ends of the cylindrical holder 25, respectively.
6a and a rear tongue piece 26b are integrally molded with this cylindrical holder. These tongue pieces 26
By means of a and 26b, the cylindrical holder 25, and therefore the magnet material 24, are always held concentrically with respect to the neck portion 4 even if the outer diameter of the neck portion varies to some extent.
At least one of the front tongue piece 26a and the rear tongue piece 26b (the rear tongue piece 26b in the example shown) is formed to be slightly longer, and this part is attached to the neck part 4 with adhesive or adhesive tape. By fixing, the entire neck magnet 20 is fixed to the neck portion.

With this configuration, since the inner diameter of the cylindrical holder 25 is made constant, even if the magnet material 24 attached to the inner surface is made to have a constant rectangular shape at the beginning, there will be variations in diameter at the joints. There are almost no gaps or overlaps caused by this, and its properties can always be maintained in a desirable state. Moreover, since the outer side of the magnet material 24 is held by the cylindrical holder 25 over the entire circumference, even if there is an elastic force in the cylindrical holder 25, the outer periphery of the neck portion 4 as shown in FIG. Unlike wrapping it around a cloth, there is no chance of the ends curling up outwards. Therefore, the magnet material 24 and the cylindrical holder 25 can be simply bonded together, and in some cases, by utilizing the elastic force of the magnet material 24 itself, the cylindrical holder 25 can be simply bonded without adhesion. You can also relieve yourself by just fitting it into the holder 25. Further, either the front portion 26a or the rear portion 26b may be omitted from the tongue piece.

As described above, the present invention can eliminate the disadvantages of the conventional method by surrounding and holding the outside of the magnet material 24 with the cylindrical holder 25 having a constant inner diameter. Of course, the specific embodiment is not limited to that shown in FIG.

In particular, various methods can be considered for fixing the cylindrical holder 25 to the neck portion 4.
A method as shown in the figure can also be used. In the figure, A shows an elastic sponge-like cushioning material 27 inserted further inside the magnet material 24 for holding purposes. As a result, even if the neck portion 4 has a slightly different outer diameter, the magnetic material 24 can always be attached concentrically to the neck portion 4.

For fixing between the neck portion 4, the buffer material 27, and the magnet material 24, an appropriate method such as the use of adhesive can be selected.

The cushioning material 27 does not necessarily have to be spongy.
An annular spring-like cylinder made of elastic plastic may also be used. The function and fixing method of the buffer material 27 in this case can be considered the same as in case A.

Note that since the cylindrical holder 25 is arranged outside the magnet material 24, the problem with magnetizing the magnet material 24 from the outside with an automatic magnetizer as needed is to make the cylindrical holder sufficiently thin. It is possible to sufficiently avoid this by devising the magnetization method.

It goes without saying that the magnet material 24 does not necessarily have to be rectangular at first, but may be a parallelogram, a rod, or a long material wound several times.

[Brief explanation of the drawing]

1 and 2 are a side view and an enlarged side view of the neck of a conventional color cathode ray tube, FIG. 3 is an enlarged side view of the neck of a color cathode ray tube showing an embodiment of the present invention, and FIG. 4 is an enlarged side view of the neck of a color cathode ray tube according to the present invention. It is the same enlarged side view of a neck part showing another Example. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. In the figure, 1...color cathode ray tube, 2...
Panel, 3...Funnel, 4...Network section, 5
... Electron gun, 6 ... Base, 10 ... Deflection yoke, 20 ... Net magnet, 21 ... Ring-shaped magnet, 22 ... Holding ring, 24 ... Magnet material, 2
5... Cylindrical holder, 26... Tongue piece, 27... Cushioning material.

Claims (1)

[Claims for Utility Model Registration] (1) A collar characterized by a neck magnet made of a cylindrical holder with a constant inner diameter and a magnetic material attached to the inside of the holder and attached concentrically to the outside of the neck of a color cathode ray tube. CRT device. (2) The cylindrical holder has a plurality of tongues arranged at its end so as to surround the neck, and the neck magnet is attached to the neck by the tongues. Scope of claim for utility model registration No. 1
The color cathode ray tube device described in Section 1. (3) The color cathode ray tube device according to claim 1, wherein the neck magnet is attached to the neck portion by disposing an annular buffer material inside the magnet material.