JPS6121795Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a neck mounting component in a color picture tube device, particularly a deflection yoke mounting structure in a self-convergence type color picture tube device.

FIG. 1 shows a conventional color picture tube device. In the figure, 1 is a color picture tube, and this color picture tube 1 includes a panel 2 having a fluorescent film (not shown) on the inner surface, a funnel 3 connected to the panel 2 and having a substantially conical shape, and a funnel 3 connected to the panel 2 and having a substantially conical shape. It consists of an electron gun 5 which is enclosed in a network part 4 connected to the electron gun 3 and generates a plurality of electron beams arranged horizontally in a line. During this operation, the network portion 4
A deflection yoke 10 and a neck magnet 20 are attached to the deflection yoke 10 and the neck magnet 20.

The deflection yoke 10 is a device that generates a magnetic field to deflect the electron beam to a predetermined position on the fluorescent film, and has a coil 11 for generating the magnetic field.

The rear end of the deflection yoke 10 projects rearward from a cover 12 made of synthetic resin that covers the coil 11, and a cylindrical fastened portion 13 consisting of a number of tongue pieces is formed at this projecting end. There is. The above-mentioned fastened part 13
By tightening with the tightening band 14 and the screw body 15, the deflection yoke 10 is attached to the color picture tube 1.
It is fixed to the neck portion 4 of. A front end frame 16 is provided at the front end of the deflection yoke 10 and is integral with the coil 11. After a wedge member 17 is press-fitted between the front end frame 16 and the funnel 3,
This part is fixed with adhesive 18.

Further, the net magnet 20 is a magnetic field generating device for correcting slight assembly errors of the color cathode ray tube 1 and adjusting the purity and convergence.
These holders 22 and the like hold a cylindrical fastened part 23 extending from the holder 22 into a fastening band 24.
It is fixed to the neck portion 4 by tightening with screws 25 and 25.

The deflection yoke 10 is fastened by a fastening band 14 or a wedge member 17.
To fix the beam in place, when performing dynamic convergence adjustment to concentrate multiple electron beams over the entire surface of the phosphor screen, the deflection yoke 10 must be oscillated relative to the color picture tube 1 to find the optimum inclination. This is to determine and then fix. In other words, this adjustment involves first adjusting the deflection yoke 10 while looking at the screen.
Slide the deflection yoke 10 on the neck part 4 to position it at the optimum position in the tube axis direction, tighten the screw 15 at that position to fix the rear end of the deflection yoke 10 to the neck part 4, and then The optimum convergence position is determined by displacing the front end of the yoke 10 vertically and horizontally, and the wedge member 7 moves the front end of the yoke 10 into the funnel 3.
This is a method to fix it against.

This swing adjustment is performed to align the axis of the deflection yoke 10 with the central axis of the electron beam group generated by the electron gun 5, since they do not coincide. Therefore, the ideal adjustment that completely meets the original purpose is to move the deflection yoke 10 parallel to the axis perpendicular to the axis of the neck part 4, and to adjust the inclination of the axis of the deflection yoke 10 and the neck part 4. It must include a slope adjustment to change the slope. The reason why this can be accomplished by just adjusting the head as described above is because the same effect can be obtained by just adjusting the head as when adjusting both parallel movement and tilt at the same time. However, if it is desired to precisely adjust the parallel movement, the deflection yoke 10 can be moved in parallel in two mutually perpendicular directions perpendicular to the axis of the neck portion 4, that is, in the X and Y directions. This is because two sets of slide mechanisms must be introduced, making the structure very complicated and expensive.

However, in order to fully utilize the characteristics of the deflection yoke 10, this problem still needs to be improved.

By the way, it has been found that when attempting to perform only one of the above-mentioned parallel displacement adjustment and tilt adjustment, better adjustment results can be obtained with the parallel displacement adjustment. This is because the electron gun 5 is located far away from the attachment point of the deflection yoke 10, and the mismatch between the axis of the deflection yoke 10 and the center axis of the electron beam group has many parallel components. This can be inferred, and this fact has also been confirmed experimentally. In reality, in color picture tube devices with wide deflection angles, a complicated mechanism is purposely adopted to enable only this parallel movement adjustment. It is something that exists.

Therefore, in this invention, a tapered cylindrical extending portion is integrally provided on the rear surface of the cover that covers the coil of the deflection yoke, and a cylindrical extending portion is attached to the tip of this extending portion to be fastened to the neck portion. By connecting the fastened parts of the yoke and arranging the neck magnet on the outside, it is possible to make adjustments close to parallel movement without complicating the structure, and it is possible to mount the deflection yoke in the correct position with high precision. The purpose of this invention is to provide a color picture tube device that can perform

First, the principle of this invention will be explained with reference to FIG. Note that the same parts as in FIG. 1 are given the same numbers. In the figure, reference numeral 13a indicates a pair of cylindrical extensions formed on the rear surface of the cover 12, and a cylindrical fastened part 13 is attached to the tip of the cylindrical extension 13a.
b are coupled. The cylindrical fastened part 13b has substantially the same structure as the conventional cylindrical fastened part 13 shown in FIG. That is, the fastened portion 13b is composed of a plurality of tongue pieces, and is set to have an inner diameter that is approximately equal to or slightly larger than the outer diameter of the neck portion 4.

The cylindrical extending portion 13a is tapered toward the rear, for example, in a conical shape. Specifically, the rear end side of this extended portion 13a is a cylindrical fastened portion 1.
3b, and as it approaches other parts, that is, the cover 12, its inner diameter becomes smaller than the neck part 4.
It is formed so that it becomes gradually larger than the outer diameter of , and has a gap d as shown in the figure.

Furthermore, the length of the cylindrical extension portion 13a is set to be sufficiently spaced so that the length from the coil rear end surface 11a to the center line of the fastening band 14 is 15 mm or more.

The adjustment method for the deflection yoke 10 having the above structure is exactly the same as the conventional one shown in FIG. The cylindrical fastened part 13b, which is fastened and fixed to the neck part 4 by the fastening band 14, is sufficiently separated from the coil rear end face 11a via the extension part 13a, and the cylindrical part 13b is secured to the neck part 4 by the fastening band 14. There is a gap d between the shaped extension portion 13a and the neck portion 4, and the other portions have a suitably large inner diameter, so when the same swing adjustment as in the past is performed, the swing will be the same as that of the fastened portion 13b. The movement of the deflection yoke 10 with respect to the neck portion 4 is almost a parallel movement, and the deflection yoke 10
positioning accuracy can be increased. This is because the longer the cylindrical extension part 13a is made, the closer the parallel movement can be made, and the positioning accuracy is further improved.

By the way, if the above principle is used,
As a result of the cylindrical fastening portion 13b being set at a position set back in the axial direction of the neck 4, there is a risk that it may come into contact with the neck magnet 20 shown in Figure 1. Therefore, this invention solves the above problem by modifying the holder portion of the neck magnet to match the holding mechanism of the deflection yoke.

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

FIG. 3 shows an example of a color picture tube device according to this invention. In the figure, a neck magnet 20 has a plurality of ring magnets 21 rotatably attached to a holder 22. As shown in FIG. The inner diameter of the holder 22 is sufficiently larger than the cylindrical extension part 13a of the deflection yoke 10, and is arranged to cover the cylindrical extension part 13a without coming into contact with it. This holder consists of a large diameter part 22a and a small diameter part 23 following it, and the small diameter part 23 constitutes a fastened part.

The inner diameter of this fastened part 23 is set to be approximately equal to or slightly larger than the outer diameter of the cylindrical fastened part 13b of the deflection yoke 10, and these two types of cylindrical fastened parts 23 and 13b are placed one on top of the other and are fastened to the neck portion 4 with one fastening band 14 and screw 15 from above.

With this configuration, even if the cylindrical extension portion 13a is made sufficiently long, the neck magnet 20 does not become an obstacle.
Furthermore, even if the deflection yoke 10 is adjusted to swing, the neck magnet 20 does not move as a result.

In the above example, the cylindrical fastened part 23 and the cylindrical fastened part 13b of the deflection yoke 10 are made separately and overlapped, but they are all made of synthetic resin or the like. It is also possible to integrally mold the holder 22 for holding the neck magnet 20 with the cylindrical extension part 13 of the deflection yoke 10.
It suffices if it is provided so as to cover a part of the lever with sufficient space outside a. Furthermore, netsuku magnet 20
does not have to be rotatable around the holder 22, but may simply be made of a sheet of magnetic material, and magnetized to the required magnetic pole distribution using a dedicated magnetizing machine. .

By the way, in FIG. 3, the cylindrical extension part 13
a does not necessarily have to have a conical shape, but may have an inner diameter that changes stepwise from the cylindrical tightened portion 13b to the rear end cover 12, or the entire cylindrical extension portion 13a may be a rigid body. If the deflection yoke 10 is fixed in place, it may be difficult to adjust the swing of the deflection yoke 10. To avoid this, it is necessary to provide thin sections or slots in some areas, or to fix the front of the deflection yoke 10. A bellows-like portion may be provided to the extent possible.

As described above, this invention has a tapered cylindrical extension protruding from the rear surface of the coil rear end cover, connects a cylindrical fastened part to the tip of this extension, and further Since a holder for the neck magnet is placed outside this extension, the deflection yoke can be adjusted in a manner close to parallel movement, and the deflection yoke can be reliably positioned at the correct position with respect to the color picture tube, and the neck magnet can be properly positioned. It can be easily positioned regardless of the installation location.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional color picture tube device, Fig. 2 is a partial side view of the color picture tube device for explaining the principle of this invention, and Fig. 3 is a side view showing an embodiment of this invention. FIG. 3 is a partially cutaway side view. 1...Color picture tube, 4...Network section, 10...
... Deflection yoke, 11 ... Coil, 12 ... Rear end cover, 13, 13b ... Fastened part of deflection yoke,
13a... Extension portion, 14... Tightening band, 20...
...Net magnet, 21...Ring magnet, 22...
Holder, 23... Fastened portion of the holder. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A color picture tube having a funnel and a neck part is composed of a deflection yoke attached near the connection part between the funnel and the neck part, and a plurality of ring-shaped magnets attached to the neck part via a cylindrical holder. A cylindrical extension part is provided on the rear surface of the cover that covers the rear end of the deflection yoke, and has a cylindrical extension part that tapers toward the rear and has a gap with respect to the outer periphery of the neck part. A portion to be fastened to the neck portion is formed at the tip of the cylindrical holder, and the front end side of the cylindrical holder is placed in an externally fitted state such that a gap exists on the outer periphery of the extension portion, and the rear end of the cylindrical holder is By providing a clamped part that overlaps the outer periphery of the clamped part at the tip of the extension part, and by tightening and fixing both of these clamped parts to the neck part with a fastening band, the deflection yoke and the neck magnet are A color picture tube device, characterized in that: is attached to the neck portion in such a manner that the swing can be adjusted using the fastened portion of the deflection yoke as a fulcrum.