JPH0145076Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a holding device for a ring magnet such as a convergence purity magnet mounted on a cathode ray tube of a television receiver.

For example, as shown in FIG. 1, a conventional ring magnet holding device has a flange-shaped locking wall 2 formed at one end of a cylindrical holder 1, and other parts of the holder 1 are placed in contact with the locking wall 2. Convergence from the edge
A plurality of ring magnets (usually 3 pairs as shown in the figure for a total of 6 magnets) 3 such as locking magnets are rotatably mounted via a spacer 4, and are integrally formed on the outer periphery of the holder 1. A locking ring 5 is screwed into the threaded portion, and the ring magnets 3 are tightened to be pressed and fixed to the locking wall 2. That is, the ring magnet holding device is fixed to the cathode ray tube neck portion by a plurality of fastening tongues 6 and a fastening metal fitting 7 that are integrally formed at one end of the holder 1 so as to protrude outside of the locking wall 2. After adjusting the ring magnet 3 with the lock ring 5 loosened, the lock ring 5 is tightened to fix the ring magnet 3.

However, in such a configuration, the tightening force is applied to the ring magnet 3 by the rotational force of the lock ring 5, so the rotation of the lock ring 5 causes the ring magnet 3 and the entire holder to rotate, making it necessary to readjust the ring magnet 3. There were drawbacks such as having to do it.

A ring magnet holding device constructed as shown in FIGS. 2 to 4 has also been proposed. In FIG. 2, reference numeral 11 denotes a cylindrical holder, and as shown in FIG. A locking pawl 13 is provided diagonally, and a flange-shaped upright wall 14 is formed at the other end facing the locking pawl 13 at a predetermined distance from the locking pawl 13 in the circumferential direction.

The upright wall 14 of the cylindrical holder 11 has four protrusions 15 located diagonally on the side surface facing the locking claw 13 and projecting in the axial direction. A tightening tongue piece 16 is formed for fixing to the cathode ray tube neck. On the outer periphery between the locking claw 13 and the upright wall 14 of the cylindrical holder 11, a plurality of ring magnets 17 (3 to 6 in the drawing), such as convergence/pilot magnets, are installed between each pair. via a spacer 18 so as to be rotatable. On the outer periphery of the cylindrical holder 11, between the upright wall 14 and the ring magnet 17, a lock ring 19 is attached to the ring magnet 17.
The length between the locking claw 13 of the cylindrical holder 11 and the upright wall 14 is set to a length that allows the ring magnet 17 and the lock ring 19 to be attached. be done. The lock ring 19 mounted on the outer circumference of the cylindrical holder 11 has three rotation knobs 21 on the outer circumferential surface, and an upright wall in the circumferential direction of the side facing the upright wall 14, as shown in FIG. Four 1/4 circular engaging portions 22 each consisting of a groove that engages with the projections 15 are formed in correspondence with the projections 15 provided in the projections 14 . Engagement part 2
2, the thickness in the axial direction (in other words, the depth of the groove) gradually changes from the starting end 22A to the terminal end 22B, and is thinnest at the starting end 22A (deep groove) and thickest at the terminal end 22B (groove shallow) is set. Further, the side surface of the lock ring 19 facing the ring magnet 17 is formed into a flat shape. During assembly, a lock ring 19 and a ring magnet 17 are sequentially installed between the locking claw 13 on the outer periphery of the cylindrical holder 11 and the upright wall 14 from the locking claw 13 side. At this time, the protrusion 1 provided on the upright wall 14
5 to the engaging portion 2 of the lock ring 19, respectively.
2 and engage the starting end 22A. Thereafter, the lock ring 19 is rotated via the knob 21 so that the tip of the protrusion 15 that engages with the engaging portion 22 is directed toward the terminal end 22B of the engaging portion 22. lock ring 1
9 rotates, the protrusion 15 slides against the surface of the engaging surface 22 whose thickness becomes thicker (the groove becomes shallower) toward the terminal end 22B, and the lock ring 19 responds to the change in the thickness of the engaging surface 22. The ring magnet 17 gradually moves in the direction of the ring magnet 17 in proportion.
is pressed in the direction of the locking claw 13. In this case, after the entire device is fixed on the cathode ray tube and the ring magnet 17 is adjusted to a position that produces the optimum magnetic field characteristics, the lock ring 19 is placed so that the tip of the protrusion 15 is located at the terminal end 22B of the engaging portion 22. The ring magnet 17 is rotated again until it reaches the locking claw 13, and the ring magnet 17 is pressed with the maximum amount of pressing force in the direction of the locking claw 13, thereby holding and fixing the ring magnet 17 on the cylindrical holder 11.

However, even in such a ring magnet holding device, the ring magnet 17 is pressed in the axial direction by the rotational force of the lock ring 19, and is tightened and fixed. The rotation of the ring magnet 19 causes the ring magnet 17 and the entire holder to rotate, resulting in disadvantages such as the need for readjustment.

The purpose of the present invention is to provide a ring magnet holding device which eliminates the above-mentioned drawbacks, and in particular provides a ring magnet holding device that does not apply rotational force to the ring magnet and the holder as a whole by providing two lock rings. This invention provides a net holding device.

Below, Figures 5 to 1 are related to one embodiment of the present invention.
This will be explained in detail with reference to FIG.

In FIGS. 5 and 6, 31 is a cylindrical holder, and the holder 31 has a hole 32 in the center through which the cathode ray tube neck is inserted, and a plurality of locking pawls having spring properties in the radial direction at one end. 33 are provided diagonally, and at the other end facing the locking pawl 33, a flange-shaped upright wall 34 is formed in the circumferential direction at a predetermined distance from the locking pawl 33. Further, a pair of grooves 35 are formed in the axial direction from diametrically opposed positions on the one end of the cylindrical holder 31 . A tightening tongue 36 is formed on the outer surface of the upright wall 34 of the cylindrical holder 31 (on the side opposite to the locking claw 33 side) for fixing to the cathode ray tube neck. On the outer periphery between the locking pawl 33 and the upright wall 34 of the cylindrical holder 31, a plurality of ring magnets 37 (3 to 6 in the drawing), such as convergence magnets, are arranged between each pair. via a spacer 38 so as to be rotatable. On the outer periphery of the cylindrical holder 31, between the ring magnet 37 and the locking claw 33, a pair of first and second lock rings 39A and 39B are attached to the ring magnet 3.
7 with a spacer 40 interposed therebetween. The distance between the locking claw 33 of the cylindrical holder 31 and the upright wall 34 is set to a length that allows the ring magnet 37 and lock rings 39A, 39B to be attached.
Of the lock rings 39A and 39B mounted on the outer periphery of the cylindrical holder 31, the first lock ring 39A, which is the inner side (the side closer to the upright wall 34) in this embodiment, is as shown in FIGS. 7 and 8. ni, 4
It has slanted protrusions 41 arranged diagonally in the circumferential direction, and a pair of protrusions 42 protruding toward the center of the ring at diametrically opposed inner peripheral positions.
are integrally formed. These protrusions 42 fit into the grooves 35 of the cylindrical holder 31.
43 is a knob that protrudes from the outer peripheral surface of the lock ring 39A. As shown in FIGS. 9 and 10, the second lock ring (the outer lock ring in this embodiment) 39B has two rotating knobs 44 on its outer circumferential surface and faces the locking pawl 33. On the side surface, there are four groove-shaped engaging portions 4 that engage with the locking claws 33.
5 are formed diagonally in the circumferential direction. Further, four holes 46 into which the inclined projections 41 of the first lock ring 39A fit are formed diagonally at positions corresponding to the inclined projections 41. This second
The opposite side of the lock ring 39B, that is, the side facing the first lock ring 39A, is formed into a flat shape.

During assembly, a ring magnet 37, a first locking ring 39A,
The second lock rings 39B are installed in sequence. At this time, the lock rings 39A and 39B are installed with the inclined protrusion 41 of the first lock ring 39A fitted into the hole 46 of the second lock ring 39B, and the engaging portion 4 of the second lock ring 39B is fitted.
5 is engaged with the locking pawl 33. In this state, that is, the state in which the inclined protrusion 41 of the first lock ring 39A is fitted into the hole 46 of the second lock ring 39B, the ring magnet 37 is slightly loosened in the axial direction and is not pressed by the lock ring. Not yet. Further, since the pair of protrusions 42 of the first lock ring 39A fit into the grooves 35 of the holder 31, the first lock ring 39A can move in the axial direction, but rotational movement is prevented. Next, the second locking ring 39
In this embodiment, when B is rotated counterclockwise in FIG. 9, the inclined protrusion 41 is disengaged from the hole 46 of the second lock ring 39B and comes into contact with the flat inner surface of the second lock ring 39B. This causes the first locking ring 39A to axially extend to the upright wall 3.
4, and the ring magnet 37 is pressed towards the upright wall 34. Since this pressing force changes depending on the thickness of the inclined protrusion 41 of the first lock ring 39A, when the second lock ring 39B is rotated by a predetermined angle and an appropriate rotational torque is applied to the ring magnet 37, The rotation of the second lock ring 39B is temporarily stopped, and the ring magnet 3
7. Perform each rotation adjustment. After these ring magnets 37 are adjusted to positions that produce optimal magnetic field characteristics, the second lock ring 39B is further rotated, and the ring magnets 37 are attached to the upright wall 34.
The ring magnet 37 is fixed by pressing and tightening in the direction.

In this way, in the present invention, two lock rings are used, and the lock ring that is in contact with the ring magnet is movable only in the axial direction, and the rotation of the other lock ring allows the lock ring that is in contact with the ring magnet to move only in the axial direction. Since the lock ring is pressed in the axial direction to press and fix the ring magnet, no rotational force is applied to the ring magnet, and contradictory rotational forces are applied to the two lockrings, so No rotational force is applied to the entire holder. Therefore, the ring magnet and holder will never rotate after adjustment, and the ring magnet can be reliably fixed at the optimal adjustment position by rotation of the other lock ring, which has the great advantage of maintaining good magnetic field characteristics. be. Furthermore, since two lock rings are used, the lock rings do not wobble during rotation, allowing reliable rotation adjustment.

In the above embodiment, the lock ring is arranged on the locking claw side, but it may also be arranged between the ring magnet and the upright wall, and configured to press the ring magnet toward the locking claw side and fix it. Good and also the first
The same effect can be achieved even if the positional relationship between the upright wall and the locking pawl is reversed, as shown in FIG. Further, modifications such as forming a hole in the first lock ring and forming an inclined protrusion in the second lock ring are optional. Further, the number of inclined protrusions, the number and shape of corresponding holes, the number and shape of engaging portions, the configuration and shape of the cylindrical holder, etc. can be varied as necessary.

As described above, according to the present invention, two lock rings are used, one having an inclined protrusion and the other having a corresponding hole, and the lock ring facing the ring magnet is connected to the other lock ring. Since the ring magnet is pressed in the axial direction by rotation and fixed, it is extremely easy to fix the ring magnet, and it is possible to securely fix the ring magnet without rotating the ring magnet or holder. It has an excellent effect of being able to be fixed. Therefore, it has great practical value when applied to television receivers and other various cathode ray tube devices.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of a conventional ring magnet holding device, and Figs. 2 to 4 show other examples of the conventional ring magnet holding device.
Fig. 2 is a side view of the ring magnet holding device, Fig. 3 is a perspective view of the cylindrical holder, Fig. 4 is a front view of the lock ring, and Figs. 5 to 10 are the ring magnet holding device according to the present invention. 5 is a side view of the ring magnet holding device, FIG. 6 is a perspective view of the cylindrical holder, and FIG.
The figure is a front view of the first lock ring, and the figure 8 is a front view of the 7th lock ring.
FIG. 9 is a front view of the second lock ring, FIG. 10 is a sectional view taken along line 10-10 of FIG. 9, and FIG. FIG. 7 is a side view of a cylindrical holder in another embodiment. 31: Cylindrical holder, 33: Locking claw, 34:
Upright wall, 35: Groove, 37: Ring magnet, 3
9A: First lock ring, 39B: Second lock ring, 41: Inclined protrusion, 42: Protrusion, 4
5: Engagement part, 46: Hole.

Claims (1)

[Scope of utility model registration request] A cylindrical holder having a locking claw at one end and an upright wall formed at the other end opposite to the locking claw, and rotating between the locking claw and the upright wall on the outer periphery of the cylindrical holder. A plurality of ring magnets that are freely attached, and a pair of lock rings that are attached between the locking claw on the outer periphery of the cylindrical holder and the ring magnet or between the upright wall and the ring magnet. of the lock rings, the lock ring on the side facing the ring magnet is mounted movably only in the axial direction of the cylindrical holder, and the remaining lock rings are rotatably mounted,
One lock ring is formed with a plurality of inclined protrusions whose thickness changes in the circumferential direction, and the other lock ring is formed with a plurality of holes into which the protrusions are fitted, and when the remaining lock ring is rotated, the inclined protrusions are formed. Remove the protrusion from the hole, bring it into contact with the inner surface of the lock ring, and press the lock ring on the side facing the ring magnet in the axial direction toward the ring magnet, thereby pressing and fixing the ring magnet. A ring magnet holding device characterized by: