JPS5836816B2 - Cathode ray tube magnet assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnet assembly for a cathode ray tube, and more particularly to a mechanism for preventing leakage of X-rays generated from an electron gun.

In general, a cathode ray tube, particularly a color picture tube, has a panel section 1 having a fluorescent surface and a shadow mask, as shown in FIG.
, a funnel-shaped funnel part 2 , and a neck part 4 having an electron gun 3 .

In the case of a pi-potential type electron gun 3, the electron gun 3 includes a heak, a cathode, and first to fourth grid electrodes Gl,
A potential difference of about 22 to 30 kV is applied between the third grid electrode G3 and the fourth grid electrode G4, and the electron beam can be focused with this.

FIG. 2 shows the third and fourth grid electrodes G3 of the electron gun 3.
, shows the vicinity of G4.

In the figure, the third and fourth grid electrodes Q3,
G4 is fixed by a glass rod 5 and insulated from each other.

6 is a ball piece gauge fixed to the fourth grid G4, and this is in contact with the internal conductive coating 7 of the funnel portion 2 by a conductive spring attached to its head.

Reference numeral 8 denotes a cylindrical shield plate having one end fixed to the ball piece gauge 6 and extending in the direction of the cathode K, which is located near a portion facing the gap between the third grid electrode G3 and the fourth grid electrode G4. This serves to prevent charges from being accumulated in the electron beam, thereby preventing changes in the direction of the electron beam due to the charges.

In FIG. 1, reference numeral 9 denotes a magnet assembly, which consists of a holder 91 made of an insulating material placed around the outer periphery of the neck portion 4 and a purity magnet 92 attached to the outer periphery of the holder 91.
, a four-pole magnet 93, a six-pole magnet 94, a spacer 95, and a lock ring 96. This magnet assembly 9 enables purity adjustment or convergence adjustment.

10 is a cylindrical lead material attached and fixed to the outer periphery of the neck part, and this is the third grid electrode G3 and the fourth grid electrode G4.
It functions to shield X-rays generated by sparks between the

According to the conventional structure described above, the lead material 10 is directly fixed to the neck portion 4 and is separate from the magnet assembly.

However, according to the above configuration, when attaching the magnet assembly 9 and the lead material 10, it is necessary to perform two operations: winding the lead material 10 and then attaching the magnet assembly 9 thereon. It has the drawback that it cannot improve its mass productivity, and furthermore, the function of the magnet assembly 9 is impaired due to variations in the mounting position of the lead material 10.

Therefore, an object of the present invention is to eliminate the need for separately attaching the lead material 10, and will be described in detail below using examples.

FIG. 3 is a diagram showing details of the cathode ray tube magnet assembly according to the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals.

11 (1) It is a cylindrical lead material that is directly attached and fixed to the outer periphery of the holder 91, and is integrated with the holder 91.

Therefore, according to such a configuration, when the holder 91 is attached to the neck portion 4, the lead material 11 is also attached at the same time.
Both can be installed in one installation operation.

If the lead material 11 has a thickness of about 0.2 to 0.3 peaks, it can sufficiently shield X-rays.

Here, although the present embodiment has been described as being mounted and fixed on the outer periphery of the holder 91, the present invention is not limited to this, and may be mounted and fixed on the inner periphery thereof.

Further, the lead material 11 is not limited to a plate-like material made into a cylinder shape, but lead powder may be sprayed or vapor-deposited on the inner and outer peripheries of the holder 91 to form a layer, and the material of the holder 91 may be The holder 91 may be made of lead, or the holder 91 may be made of lead, as long as the lead material is directly integrated with the holder 91.

As explained above, according to the cathode ray tube magnet assembly according to the present invention, the lead material is directly integrated into the holder 91, or the holder 91 is formed from lead, so that the mounting work is easy and the mass productivity of the cathode ray tube itself is improved. It has the effect of improving

[Brief explanation of the drawing]

FIGS. 1 and 2 are simplified structural diagrams showing an example of a conventional magnet assembly for a cathode ray tube, and FIG. 3 is a simplified structural diagram showing an example of a magnet assembly for a cathode ray tube according to the present invention. 9... Magnet assembly, 91... Holder 92-94... Magnet, 95...
... Svesa, 96 ... Lock ring, 10
, 11... Lead material.

Claims (1)

[Claims] 1. In a magnet assembly for a cathode ray tube, which is equipped with a holder that holds a magnet placed on the outer periphery and is placed on the outer periphery of the neck part that houses the electron gun of the cathode ray tube, there is no lead material on the outer periphery, inner periphery, or inside of the holder. A magnet assembly for a cathode ray tube, characterized in that the holder is made of lead material.