JPS59209251A - convergence yoke - Google Patents

Abstract

PURPOSE:To eliminate any necessity of convergence adjustment by attaching a pair of annular purity magnet plates around the circumference periphery of a supporting plate and freely-rotatably attaching a pair of annular six-magnetic-pole-type convergence magnet plates and a pair of annular four-magnetic-pole-type convergence magnet plates around a holder section between the supporting plate and a rotary ring. CONSTITUTION:A cylindrical synthetic-resin holder 1 has an inner diameter slightly larger than the diameter of the neck of an inline-type color picture tube. It has plural hooks 2 in its front open end and has a flange 3 in its body. Around the holder section 4 of the holder 1, a rotary calking ring 5 made of a synthetic resin, a pair of annular six-magnetic-pole-type convergence magnet plates 6 and 7 and a pair of annular four- magnetic-pole-type convergence magnet plates 8 and 9 are attached in such a manner as to be freely rotatable. Besides, a circular supporting plate 10 made of a synthetic resin is attached around the holder section 4. The flanges 14 and a proper number of hooks 15 of the supporting plate 10 are inserted from the front and the back of a pair of annular two-magnetic-pole-type purity magnet plates 17 and 18 freely-rotatably attached around rims 16 provided on the front peripheral end of the supporting plate 10 to support it.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a convergence yoke applied to an in-line color picture tube.

A convergence yoke applied to an in-line color picture tube consists of a pair of annular two-pole magnetic plates superimposed on the convergence yoke, as shown in, for example, Japanese Utility Model Publication No. 54-42691. A pair of annular 4-pole convergence magnet plates, a pair of annular 6-pole convergence magnet plates overlaid thereon, and a cylindrical holder that rotatably supports these magnet plates. and is attached to the neck of an in-line color picture tube. When making utility and static convergence adjustments, the magnet plate is rotated appropriately to change the magnetic flux density distribution, but no matter how perfect the adjustment is, the color picture tube device cannot be used in areas where the influence of the earth's magnetic field is different. If it is moved to , misconvergence will occur, and convergence adjustment will need to be made again.

The adjusted magnet plate is usually removably fixed to the holder by applying paint or the like, so that convergence adjustment can be performed again by releasing this fixation. However, when the fixation is released and the convergence magnet plate is rotated, the adjacent purity magnet plate tends to rotate together with it, and if this happens, readjustment of the purity is required. .

The present invention has been made to solve the conventional disadvantages of φ. Next, the convergence yoke of the present invention will be explained along with embodiments shown in the drawings.

1 and 2, a cylindrical holder 1 made of synthetic resin is an in-line color picture tube (not shown).
It has an inner diameter slightly larger than the outer diameter of the neck part, has a plurality of hook parts 2 on the opening edge of the front part, and has a flange part 3 on the abdomen.

The holder portion 4 is provided with a tightening rotating ring 6 made of synthetic resin, a pair of annular 6-magnetic pole type convergence magnet plates 6, 7, and a pair of annular 4-magnetic pole type convergence magnet plates 8°. 9 is rotatably inserted, and then an annular support plate 1o made of synthetic resin is inserted. At this time, the convex portion 11 formed on the inner circumferential surface of the annular support plate 10 fits into the four portions 12 formed on the outer circumferential surface of the holder 1, and the hook portion 2 of the holder 1 is attached to the support plate 1°. By engaging the front edge portion 13, the support plate 1
o is unrotatably fixed to the front opening edge of the holder 1.

The flange portion 14 and the appropriate number of hook portions 16 of the support plate 1o are a pair of circles that are rotatably inserted into the rim portion 16 on the front outer peripheral edge of the support plate 10, as shown in FIG. Annular two-pole magnetic plates 17 and 18 are inserted and supported from the front and rear. Further, the mutually opposing surfaces of the rotating tightening ring 5 and the flange portion 3 are spirally inclined, and when the rotating tightening ring 6 is rotated, the rotating ring 5 moves forward and backward, and the distance between the rotating tightening ring 5 and the support plate 1o changes. . That is, when the rotating ring 6 is rotated, the magnetic plates 6, 7, 8
．． 9 is tightened in the thickness direction, and when turned counterclockwise, the tightening is released. 19 indicates a tightening band. In addition, Fig. 4 (aJ, (b)) shows the relationship between the direction of the lines of magnetic force of the four-pole type convergence magnet plates 8 and 9 and the direction of the force applied to the three electron beams B, G, and R arranged in-line. , Figure 6 (a) and (b) show the direction of the magnetic field lines of the six-magnetic pole type Comparzefus Magnetoso plate 6.
It shows the relationship with the direction of the force that the electron beams B, G, and R receive.

According to the convergence magnet plate 17.18 rotatably provided on the outer periphery of the annular support plate 1o, the convergence magnet plate 6° 7.8 Since it is separated from .9, it is difficult to adjust the status when adjusting the convergence.
The fear that the Zensmagnesoto plates 6.7 and 8.9 will rotate together is eliminated. Furthermore, by increasing the diameter of the purity magnet throat plates 17 and 18, a more uniform magnetic field distribution can be achieved. Furthermore, by rotating the tightening rotary ring 5 clockwise, the adjusted magnet plates 6, 7, 8.9 can be firmly fixed to the holder 1. By turning it counterclockwise, the fixing can be immediately released, and the static cone can be readjusted easily.Furthermore, after the adjustment, the pulley magnet plate 17, 18 can be moved to Perro. There is an advantage that there is no problem even if it is fixed to the support plate 10 by coating.

In the above embodiment, a spiral inclined surface was formed on the opposing surfaces of the rotating ring 5 and the flange portion 3 as a mechanism for adjusting the forward and backward movement of the rotating ring 6. The ring 6 may be screwed together.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a convergence yoke embodying the present invention, Fig. 2 is a side sectional view of the convergence yoke,
FIG. 3 is an enlarged perspective view of a part of the convergence yoke, FIG. Figure 6 (aJ, (b) is a diagram showing the relationship between the direction of magnetic lines of force of a six-pole type convergence magnet plate and the direction of force applied to the electron beam.0 1...Cylindrical holder, 2... ... Hook part, 3 ... Flange part, 4 ... Holder part, 6 ... Rotating ring for tightening, 6, 7, 8
．． 9... Magnet plate, 10... Support plate, 11... Convex portion, 12... Concave portion, 1
3...Front edge part, 14...Flange part, 16...Hook part, 16...
, rim part, 17 , 18 = - - purity magnet plate, 19... tightening band 0 Name of agent Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 (ca) (b) Figure 5 ((A) (b)

Claims (1)

[Claims] A cylindrical holder attached to the neck of an in-line color picture tube is provided with an annular support plate on one opening edge, and a tightening rotary ring is provided on the abdomen of this holder so that it can move forward and backward, and the support plate A pair of annular purity magnet plates are rotatably inserted into the outer peripheral edge of the support plate, and a pair of annular six magnetic poles surrounding the holder part between the support plate and the rotating ring are fitted. A convergence yoke comprising a convergence magnet plate and a pair of annular four-pole convergence magnet plates rotatably inserted therein.