JPS6324614Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a color cathode ray tube in which a magnetized sheet is securely fixed on the neck portion.

FIG. 1 shows a color cathode ray tube device to which this invention is applied.

The color cathode ray tube 1 has a fluorescent film (not shown) on its inner surface, a panel 2 which serves as an image projection part, a funnel 3 connected to the panel 2 and having a roughly cone shape, and a funnel 3 connected to the panel 2. An electron gun 5 that generally generates a plurality of electron beams is enclosed in the neck portion 4, and a terminal portion that supplies various voltages to operate the electron gun 5. It consists of a lead-in line 6 and a base 7.

When operating such a color cathode ray tube 1, it is necessary to attach the deflection yoke 10 and the neck magnet 20 to the neck portion 4.

The deflection yoke 10 is a magnetic device for deflecting the electron beam from the electron gun 5 and directing it to a necessary part of the fluorescent film provided on the inner surface of the panel 2, and is generally used to connect the funnel 3 and the neck portion 4. It is attached near the department. The net magnet 20 is such that the overall or mutual position of the plurality of electron beams emitted from the electron gun 5 is shifted from the position necessary for the operation of the color cathode ray tube 1. This "misalignment" is mainly caused by assembly errors during the manufacturing of the color cathode ray tube 1,
It is used to magnetically correct the external unnecessary magnetic field generated in the place where the color cathode ray tube 1 is operated, and generally uses a disk-shaped ring-shaped magnet 21 magnetized in a special pattern. It is composed of a plurality of sheets assembled together, and is attached to the neck portion 4 using a suitable holder 22, as shown in FIG.

The reason why multiple ring-shaped magnets 21 are used is because the magnetic field pattern required to correct the above-mentioned "misalignment" is relatively complex and differs depending on the product. The desired pattern is achieved by superimposing ring-shaped magnets in appropriate directions, and the direction of each magnet is generally determined by actually operating the color cathode ray tube. Usually, the decision is made based on the actual product while looking at the displayed screen.

As shown in the enlarged view of the neck part in Figure 2, the magnetic field formed by the plurality of ring-shaped magnets 21, and the enlarged view of the neck part of the structure using the heat shrinkable tube and magnetized sheet in Figure 3. As shown in the figure, a magnetized sheet 23 having a corresponding magnetic field is used in place of the ring-shaped magnet 21.

In this case, the magnetized sheet 23 is placed on the neck 4, and as a means for fixing the magnetized sheet 23 on the neck 4, a heat shrink tube 24 made of vinyl chloride is used. FIG. 4 is a sectional view of the neck portion showing this configuration.

In this case, a vinyl chloride heat shrink tube 24
has the ability to fix the magnetized sheet 23 at room temperature, but when heat such as hot air inside a television set or heat from inside the cathode ray tube is applied, part of the material of the heat shrink tube 24 or The drawback is that the entire structure stretches, reducing the fixing strength of the magnetized sheet, and the performance deteriorates due to movement of the magnetized sheet.

This invention was made to eliminate the drawbacks of the conventional ones as described above, and provides a color cathode ray tube that maintains high quality without decreasing the fixing strength of the magnetized sheet even when heat is applied. It is something.

An embodiment of this invention will be described below with reference to FIG.

A holder 22 is provided on the neck portion 4 as before, a magnetized sheet 23 is placed on this holder 22, and this magnetized sheet 23 is fixed by taping with a thermosetting epoxy resin-impregnated tape 25. . In this state, this epoxy resin-impregnated tape 2
When the part 5 is heated at 140° C. for 30 minutes, it is thermosetted and the magnetized sheet 23 inside is fixed on the holder 22.

Because of the above structure, the material fixing the magnetized sheet 23 does not expand or thermally deform due to external heat, which weakens the fixing force, unlike in the past. do not have. Therefore, during use, the magnetized sheet 23 is removed from the holder 22.
Since there is no risk of movement of the magnetic field, there is no movement of the predetermined magnetic field, and it is possible to provide a high quality color cathode ray tube by eliminating factors that degrade the performance of the cathode ray tube.

In the above-mentioned embodiment, the case where the magnetized sheet 23 is fixed on the holder 22 has been explained, but the case where the magnetized sheet 23 is fixed on the neck part 4 directly or via tape or the like without a holder is also possible. By taping the magnetized sheet 23 with a tape impregnated with a thermosetting resin, the same effect as described above can be obtained.

Additionally, if the thermosetting resin is impregnated into the tape as described above, it will be easier to handle, but this invention is not limited to this. It is also possible to coat the magnet with a thermosetting resin on the magnetized sheet.

As described above, this invention has the effect of providing a high quality cathode ray tube in which the fixing strength of the magnetized sheet does not deteriorate due to heat.

[Brief explanation of drawings]

Figure 1 is an external view of a color cathode ray tube device;
The figure is an enlarged view of the neck part, Figure 3 is an enlarged view of the neck part of a conventional cathode ray tube using a heat-shrinkable tube and a magnetized sheet, and Figure 4 is an enlarged view of the neck part of a conventional cathode ray tube using a heat-shrinkable tube and a magnetized sheet. 5 is a sectional view of a neck portion of a color cathode ray tube according to an embodiment of this invention. DESCRIPTION OF SYMBOLS 1... Color cathode ray tube, 4... Network part, 23... Magnetized sheet, 25... Epoxy resin impregnated tape. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) By installing a magnetized sheet for applying an electron trajectory correction magnetic field to the network part and coating a thermosetting resin on the magnetized sheet, the above magnetized sheet can be obtained. A color cathode ray tube characterized by having a fixed to the network part. (2) The color cathode ray tube according to claim 1, wherein the magnetized sheet is fixed to the neck portion via a holder. (3) Claim 1 of the utility model registration in which a tape is impregnated with a thermosetting resin and this tape is applied on a magnetized sheet. (4) The color cathode ray tube according to claim 1 or 3, wherein the thermosetting resin is an epoxy resin.