JPS62133Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a color cathode ray tube, particularly to a neck magnet provided in the neck portion.

A conventional color cathode ray tube device has a configuration as shown in FIG.

In FIG. 1, numeral 1 is a color cathode ray tube having a fluorescent film (not shown) on its inner surface. 2 is a panel that is an image projection part, 3 is connected to panel 2,
The funnel 4, which is approximately cone-shaped, is connected to the funnel 3 by a neck portion made of a glass cylinder. Reference numeral 5 denotes an electron gun that generates a plurality of electron beams, and is provided within the network portion 4. 6
is a base 6 that supplies various voltages for operating the electron gun 5;

In such a configuration, when operating such a color cathode ray tube, the deflection yoke 10
It is also necessary to attach the neck magnet 20 to the neck portion 4. The deflection yoke 10 is a magnetic device that deflects the electron beam (not shown) from the electron gun 5 and guides it to a necessary part of the fluorescent film provided on the inner surface of the panel 2. It is attached near the connection part 4. The network magnet 20 connects the plurality of electron beams from the electron gun 5 as a whole or/and each other to the color cathode ray tube 1.
deviated from the position required for operation. This "misalignment" is mainly caused by assembly errors during the manufacture of color cathode ray tubes and the influence of unnecessary external magnetic fields in the place where the color cathode ray tube is operated, but a special pattern is generally used to magnetically correct this. It is made up of a combination of a plurality of disc-shaped ring-shaped magnets 21 magnetized to
It is attached to the neck 4 by a suitable retaining ring 22. The number of ring-shaped magnets 21 is six in the case of 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 at a certain angle as a whole. The other two beams generate a magnetic field that bends two of the three electron beams by the same amount in opposite directions, and the last two beams bend the three electron beams in opposite directions. It is magnetized to generate a magnetic field that bends the two beams on both sides by the same amount in the same direction. By adjusting the direction with respect to the color cathode ray tubes 1 as a set, the magnitude and direction of the bending can be arbitrarily obtained. In the end, the desired correction can be made by adjusting the mounting angles (directions) of all six magnets.

The amount of correction, that is, the direction, is determined by actually attaching the deflection yoke 10 and the net magnet 20 to the color cathode ray tube 1, operating them, looking at the projected screen, and checking the actual image so that it is the best. Each ring-shaped magnet of the neck magnet 20 is normally fixed at its best position. However, this work requires skill and is difficult to automate, contributing to the increased cost of color cathode ray tubes. Therefore, in recent years, it has become common practice to make a net magnet 20 as shown in Fig. 2 from a sheet of magnetic material and magnetize it according to the state of the screen, that is, the state of the error to be corrected. I'm getting old. The 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 cut 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 electrically measure the state of the screen, calculate the necessary magnetization distribution from this, and automatically operate the magnetizer according to this, making it possible to automatically perform a series of operations at once. The above-mentioned difficulty in automation can be solved, and materials can also be saved.

In this case, it is necessary to wrap the material of the neck magnet 20 uniformly over 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 the diameter of the neck part of about 30 mm. It is assumed that you will not receive any. Therefore, if the material to be wrapped around the neck part 4 is prepared in advance in a rectangular shape of a certain size, the seam 2 to be joined in the circumferential direction as shown in FIG.
3 shall be provided. In this case, if the diameter of the neck portion deviates from the design value, a gap or an overlapping portion of the magnet material will appear at the joint 23, and the amount thereof will reach a maximum of about 3 mm. This significantly impedes automatic magnetization.

The present invention was devised in order to eliminate such inconveniences, and the magnet material is made of a magnet material having a certain degree of elasticity, which is made by mixing a magnet alloy or oxide into a synthetic resin, and is made of a pipe with no seams in the circumferential direction. With this structure, a novel color cathode ray tube device is provided which can eliminate gaps or overlapping parts that may occur at joints.

An embodiment of the present invention will be described below. As shown at 20a in FIG. 3, the magnet material is composed of a pipe made of a so-called plastic magnet or rubber magnet, which is made by mixing a magnetic alloy or oxide into a synthetic resin having a certain degree of elasticity. This pipe 20a has no joints in the circumferential direction, and its inner diameter is
Make it slightly smaller than the minimum diameter of the variation range of the outer diameter of the neck part 4 to which this is to be attached,
It is forcibly fitted into the neck portion 4 to some extent. In this way, not only can the above-mentioned problem of gaps or overlaps between the joints be solved, but also the fixing of the neck magnet 20 to the neck 4 becomes extremely easy, and the joint 23 can be fixed using high-grade adhesive. In order to prevent the net magnet 20 from coming off, it is possible to eliminate the extra effort of wrapping another tape over it, and at most it can be fixed sufficiently by applying an inexpensive adhesive or paint. It can be done, and it can be done at a low cost. Furthermore, it is also conceivable that the plastic into which the magnetic material is mixed has heat-shrinkable properties. In this case, the inner diameter of the magnet material 20a before it is attached to the neck part 4 may be larger than the outer diameter of the neck part 4, and when it is attached, it can be appropriately heated to shrink it and securely fixed.
In some cases, it is possible to securely tighten and fix by only temporarily fixing and then using the heat generated by the electron gun 5 itself.

It goes without saying that the present invention can also be applied to a case where a thin annular spacer is interposed between the magnet material 20a and the neck portion 4 for cushioning or other purposes.

As explained above, according to the present invention, the neck magnet provided around the neck portion is made of a magnetic material having a certain degree of elasticity, which is made of a synthetic resin mixed with a magnetic alloy or oxide, and connected in the circumferential direction. Since it is constructed from a seamless pipe, there are no gaps or overlaps between the joints of the neck magnets as in the past, making automatic magnetization easier, and the neck magnets can be fixed easily and firmly. can.

[Brief explanation of the drawing]

1 and 2 are configuration diagrams of a conventional color cathode ray tube, and FIG. 3 is a component explanatory diagram for explaining an embodiment of the present invention. Note that the same reference numerals in the figures indicate the same or corresponding parts. 1...color cathode ray tube, 2...panel, 3...
...funnel, 4...network department, 5...electron gun,
6...Base, 10...Deflection yoke, 20...Net magnet, 20a...Magnet material, 21...Ring magnet, 22...Retaining ring, 23...Seam.

Claims (1)

[Claims for Utility Model Registration] (1) A neck part, an electron gun held in the neck part, and a magnet material provided around the neck part that has a certain degree of elasticity and is joined in the circumferential direction. A color cathode ray tube device comprising a neck magnet having a seamless pipe, the pipe being made of a synthetic resin mixed with a magnetic alloy or oxide. (2) The color cathode ray tube device according to claim 1, wherein the synthetic resin has heat shrinkability.