JP2001167717A - Deflection yoke fixing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a deflection yoke to a CRT in an exact and easy manner. SOLUTION: On a funnel portion of CRT 1 are formed protrusions 20a, 20b, 20c, 20d. Further, on a separator 13 of a deflection yoke 4 are formed engaging nails 21a, 21b, 21c, 21d. Upon fixing the deflection yoke, the protrusions 20a, 20b, 20c, 20d and the locking nails 21a, 21b, 21c, 21d are fitted with each other and fixed at exact positions, only by mounting the reflection yoke 4 on the CRT 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke fixing mechanism for fixing a deflection yoke to a cathode ray tube (CRT) such as a television and a computer display.

[0002]

2. Description of the Related Art Conventionally, in a CRT used for a television or a computer display, a deflection yoke for scanning an electron beam from an electron gun is provided outside the CRT. The deflection yoke is fixed to a CRT after its position is adjusted so that the display characteristics are best. Conventionally, there are the following mechanisms for fixing the deflection yoke.

Here, FIGS. 10 (a) and 10 (b) show at present
It is the side view and front view which show an example of the fixing mechanism of the deflection yoke most frequently used. As shown in the figure, a band 2 is screwed to the neck side of the cathode ray tube 1 and three to four rubber wedges 3a, 3b,... Are inserted into the gap between the CRT 1 and the deflection yoke 4 at the opening side. And the deflection yoke 4 is C
It is fixed to RT1. The rubber wedges 3a, 3b,... Are provided with a double-sided tape (not shown).
And the rubber wedges 3a, 3b,... Also,
.. May be fixed with silicone rubber (not shown) in order to prevent the rubber wedges 3a, 3b,.

Next, FIG. 11 is a side view showing another example of a deflection yoke fixing mechanism according to the prior art. FIG.
5A, screws 5a and 5 provided on the deflection yoke 4 side are used.
By pressing b, ... against the funnel of CRT1,
The deflection yoke 4 is fixed. 11B, blocks 6a, 6b,... Having a surface parallel to the Z axis are attached to the funnel portion of the CRT 1, and screws 7a, 7b,. , 6
The deflection yoke 4 is fixed by pressing against the b. In FIG. 11C, a slide pin 8 that slides integrally with the deflection yoke 4 is provided on the opening side of the deflection yoke 4.
are provided, and the slide pins 8a, 8b,... are pressed against the funnel portion of the CRT 1, and when the positions are determined, the slide pins 8a, 8b,. Thus, the deflection yoke 4 is fixed.

Next, FIG. 12 is a conceptual diagram showing an example of a landing pattern on the fluorescent screen of the CRT 1 depending on the position (front and rear) of the deflection yoke attached to the CRT. G
When adjusting the landing of (green), if the deflection yoke 4 is attached to the panel (fluorescent screen = front) side,
As shown in FIG. 12A, R (red), G (green), and B (blue) appear as landing patterns on the phosphor screen. When the deflection yoke 4 is mounted on the gun (= electron gun, rear) side, as shown in FIG. 12B, a landing pattern is formed on the phosphor screen as a landing pattern.
B (blue), G (green), and R (red) appear. Further, when the deflection yoke 4 is attached to the exposed position (normal position), only G (green) appears as a landing pattern on the phosphor screen, as shown in FIG. If the mounting position of the deflection yoke 4 is not ensured, mislanding occurs and the color purity is reduced.

Next, FIGS. 13A and 13B are conceptual diagrams showing convergence of R (red) and B (blue) beams depending on the position (up, down, left, and right) of a deflection yoke attached to a CRT. 13 (c) and 13 (d) are conceptual diagrams showing the distortion of the raster depending on the position (up, down, left and right) of the deflection yoke attached to the CRT. When the position of the deflection yoke 4 is shifted downward with respect to the CRT 1, FIG.
As shown in (a), a rotational shift of the R (red) and B (blue) beams occurs. FIG. 13B shows that when the position of the deflection yoke 4 is shifted to the left with respect to the CRT 1, R
The size of the (red) and B (blue) beams is shifted. The G (green) beam is omitted because it is located between the R (red) and B (blue) beams. Similarly, when the position of the deflection yoke 4 is shifted downward, as shown in FIG. 13C, raster distortion (image distortion) having a width different in the vertical direction occurs. Similarly, when the deflection yoke 4 is shifted to the left, a raster distortion (image distortion) in which the left and right heights are different occurs as shown in FIG. If the mounting position of the deflection yoke 4 is not ensured in this way, the color bleeding increases, and surface distortion occurs, resulting in a screen that is difficult to see.

[0007]

By the way, the screens of CRTs such as televisions and computer displays have recently been flattened. In the conventional round screen, as described above, the convergence and the image distortion can be set to the best positions almost simultaneously by the swing adjustment (position adjustment) of the deflection yoke 4. However, when the screen becomes flat, the sensitivity difference between the convergence characteristic and the image distortion characteristic due to the swing adjustment of the deflection yoke 4 increases, and it is difficult to adjust the convergence and the image distortion only by adjusting the position of the deflection yoke 4. It has become to. Some deflection yokes 4 do not adjust the swing. in this case,
The convergence and the image distortion are adjusted by a correction circuit provided in the deflection yoke 4 in order to improve the accuracy. Also,
Image distortion has also been digitized, and is improved by moving a video signal. As described above, when the deflection yoke 4 is not adjusted to swing, the fixing mechanism of the deflection yoke 4 according to the related art as described above deteriorates productivity of a television receiver, a computer display, and the like, and leads to an increase in cost. is there.

Accordingly, an object of the present invention is to provide a deflection yoke fixing mechanism capable of accurately and easily fixing a deflection yoke to a CRT.

[0009]

According to a first aspect of the present invention, there is provided a deflection yoke fixing mechanism for fixing a deflection yoke to a funnel portion of a cathode ray tube. A projection is provided, and a plurality of locking claws are provided at positions corresponding to the plurality of projections on the opening side of the deflection yoke, and when the deflection yoke is mounted on the cathode ray tube, the plurality of projections are provided. And the plurality of locking claws are fitted to fix the deflection yoke.

In a preferred embodiment, in the deflection yoke fixing mechanism according to the first aspect, the plurality of locking claws are locked by sandwiching the plurality of projections. May be provided.

In a preferred embodiment, in the deflection yoke fixing mechanism according to claim 1, the plurality of locking claws are locked by enclosing the plurality of projections. May be provided.

In a preferred embodiment, for example, in the deflecting yoke fixing mechanism according to the fourth aspect, the plurality of locking claws are provided so as to mount the deflecting yoke on the cathode ray tube. A tongue piece having elasticity for pressing the plurality of protrusions in a state where the tongues are fitted to the plurality of protrusions may be provided.

According to the present invention, the plurality of projections provided on the funnel portion of the cathode ray tube and the plurality of locking claws provided at positions corresponding to the plurality of projections on the opening side of the deflection yoke. Are fitted to fix the deflection yoke. Therefore, the deflection yoke can be accurately and easily fixed to the cathode ray tube.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of the embodiment of the present invention. Parts corresponding to those in FIG. 9 are described with the same reference numerals. In the figure, CRT
An electron gun that emits an electron beam is enclosed in 1, and a deflection yoke 4 that deflects the electron beam emitted from the electron gun is attached outside the CRT 1.

FIG. 2 is a sectional view showing the structure of the deflection yoke of the present embodiment, and FIG. 3 is a front view showing the structure of the deflection yoke. 2, a deflection yoke 4 includes a horizontal deflection coil 10 for deflecting the electron beam to the left and right,
A vertical deflection coil 11 that deflects up and down is combined, and a core 12 made of ferrite is provided outside the vertical deflection coil 11 in order to increase the efficiency of the magnetic field generated by the deflection coils 10 and 11.
Is installed. The vertical deflection coil 11 and the core 12
Is mounted outside the separator 13 and is fixed by hot melt. On the neck side of the deflection yoke 4,
A ring magnet 14 for correcting an assembly error of the electron gun is mounted. The clad horizontal coil 10 is assembled inside the separator 13 and fixed by the separator 13 as shown in FIG.

Next, FIG. 4 is a side view showing an example of the deflection yoke fixing mechanism of the present embodiment, and FIG.
FIG. 3 is a perspective view showing a projection provided on a funnel portion of T1. FIG.
It is a perspective view which shows the locking nail | claw provided in. In FIG. 5, the core of the deflection yoke and the like are omitted. CRT
As shown in FIG. 5 (a), a CR
Projections 20a, 20b, 20c, and 20d are formed integrally with T1. Also, on the opening side of the deflection yoke 4,
As shown in FIG. 5B, the protrusions 20a, 20b,
Locking claws 21a, 21b, 21c, and 21d are provided on the separator 13 at positions where they are fitted with 20c and 20d.

Mechanically, when the deflection yoke 4 is mounted on the CRT 1, the projections 20a, 20b, 20c, and 20d are engaged with the locking claws 21a, 21b, 21c, and 21d. At this time, the left and right locking claws 21a and 21c perform left and right positioning, and the left and right locking claws 21b and 21d perform vertical positioning. Thus, accurate positioning with respect to the CRT 1 can be simply performed. If misconvergence or image distortion still occurs, adjustment is made by a correction circuit (not shown) or a correction mechanism (not shown) provided in the deflection yoke 4. These correction circuits or correction mechanisms are well-known and will not be described.

FIG. 6 is a perspective view showing an example of another embodiment of the present invention. In the figure, locking claws 22a, 22b, 22 are fitted on the separator 13 of the deflection yoke 4 so as to sandwich the ends of the projections 20a, 20b, 20c, 20d provided on the funnel of the CRT 1.
c and 22d are provided. Mechanically, when the deflection yoke 4 is mounted on the CRT 1 in the same manner as in the above-described embodiment, the projections 20a, 20b, 20c, 20d and the locking claws 2 are used.
2a, 22b, 22c, and 22d are fitted. At this time, left and right positioning is performed by the upper and lower locking claws 22a and 22c, and vertical positioning is performed by the left and right locking claws 22b and 22d.

FIGS. 7A and 7B are a perspective view and a side view showing an example of another embodiment of the present invention. In the figure, the separator 13 of the deflection yoke 4 has a CRT
The projections 20a, 20b,
Locking claws 23a, 23b, 23c, and 23d are provided so as to wrap around the three side surfaces 20c and 20d. Mechanically, when the deflection yoke 4 is mounted on the CRT 1, the projections 20a, 2
0b, 20c, 20d and locking claws 23a, 23b, 23
By fitting c and 23d, accurate positioning with respect to the CRT 1 can be simplified.

Next, FIG. 8 is a perspective view showing a modification of the box-shaped locking claw shown in FIG. 7, and a sectional view showing its mechanism. In addition, actually, a total of four locking claws are provided on the upper, lower, left, and right similarly to the above-described embodiment, but only one locking claw will be described below for the sake of simplicity. . Since the projections 20a to 20d are formed integrally with the CRT 1, that is, are formed of glass, there is a taper for removing the funnel from the mold in the process of manufacturing the funnel, and the deflection yoke is provided. 4
If you adjust the landing by moving back and forth, rattling will occur.

Therefore, in the present modification, a locking claw 24 is provided on the separator 13 of the deflection yoke 4 at a position corresponding to the projections 20a to 20d formed on the funnel of the CRT 1. Elastic tongue pieces 24a are provided in the upper and lower portions. In a state where the deflection yoke 4 is mounted on the CRT 1, the tongue pieces 24a are continuously provided, and the corresponding protrusions 20a to 2
It is structured to contact and press 0d. Thereby, it is possible to prevent the above-mentioned play due to the taper.

FIG. 9 is a perspective view showing another modified example of the box-shaped locking claw shown in FIG. In addition, actually, a total of four locking claws are provided on the upper, lower, left, and right similarly to the above-described embodiment, but only one locking claw will be described below for the sake of simplicity. . In this modification,
On the separator 13 of the deflection yoke 4, a locking claw 25 is provided at a position corresponding to the projections 20 a to 20 d formed on the funnel portion of the CRT 1, and an elastic tongue is provided on a portion corresponding to a side surface of the locking claw 25. Pieces 25a and 25b are provided. When the deflection yoke 4 is mounted on the CRT 1, the tongue pieces 25a and 25b are constantly brought into contact with the side surfaces of the corresponding projections 20a to 20d provided on the CRT 1 and pressed. Thereby, it is possible to prevent the above-mentioned play due to the taper.

According to the above-described embodiment, the protrusions 20a, 20b, 20c, and 2 are provided on the funnel (convex portion) of the CRT 1.
0d and the separator 13 of the deflection yoke 4
By providing the locking claws 21a, 21b, 21c, 21d (or the locking claws 24, 25) thereon, the deflection yoke 4
Just by attaching to the RT1, the protrusions 20a, 20b, 20
c, 20d and locking claws 21a, 21b, 21c, 21d
(Or the locking claws 24 and 25) are fitted, and accurate positioning with respect to the CRT 1 can be simplified. Therefore, the rubber wedge which is stopped at three or four places as in the related art is not required. Therefore, the productivity of the combination of the CRT 1 and the deflection yoke 4 can be improved and wedges can be eliminated, so that the cost can be reduced.

In the prior art, the mounting position of the deflection yoke 4 shifts in a long-term temperature cycle depending on the force of inserting a rubber wedge. On the other hand, in the present embodiment, the protrusions 20a, 20b, 20
c, 20d and locking claws 21a, 21b, 21c, 21d
Since there is little stress in the fitting portion with the engaging claws 24 and 25, there is no concern that the position of the deflection yoke 4 is shifted, and the reliability can be improved.

Further, by providing an elastic tongue at a predetermined position of the locking claw provided on the separator 13 of the deflection yoke 4, accurate and accurate positioning can be simplified.

[0026]

According to the first aspect of the present invention, a plurality of projections provided on the funnel portion of the cathode ray tube and a plurality of projections provided at positions corresponding to the plurality of projections on the opening side of the deflection yoke. Since the deflection yoke is fixed by fitting a plurality of locking claws, the deflection yoke can be accurately and easily fixed to the cathode ray tube. Can be

According to the second aspect of the present invention, the deflection yoke is locked by sandwiching the plurality of projections by the plurality of locking claws. Can be fixed accurately and easily.

According to the third aspect of the present invention, the deflection yoke is locked by enclosing the plurality of projections with the plurality of locking claws, so that the deflection yoke is deflected with respect to the cathode ray tube. The advantage is obtained that the yoke can be fixed accurately and easily.

According to the fourth aspect of the present invention, tongues are provided on the plurality of locking claws, and the plurality of projections are fitted to the plurality of projections so that the deflection yoke is mounted on the cathode ray tube. Then, since the projection was pressed by the tongue piece,
An advantage is obtained in that the deflection yoke can be accurately and easily fixed to the cathode ray tube.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a structure of a deflection yoke according to the embodiment.

FIG. 3 is a front view showing the structure of the deflection yoke of the embodiment.

FIG. 4 is a side view showing an example of a deflection yoke fixing mechanism of the embodiment.

FIG. 5 is a perspective view showing a projection provided on a funnel portion of a CRT, a deflection yoke, and a locking claw provided on a separator thereof according to the embodiment.

FIG. 6 is a perspective view showing an example of another embodiment of the present invention.

FIG. 7 is a perspective view and a side view showing an example of another embodiment of the present invention.

8 is a perspective view showing a modified example of the box-shaped locking claw shown in FIG. 7, and a cross-sectional view showing its mechanism.

FIG. 9 is a perspective view showing another modification of the box-shaped locking claw shown in FIG. 7;

FIG. 10 is a side view and a front view showing an example of a deflection yoke fixing mechanism according to the related art.

FIG. 11 is a side view showing another example of a deflection yoke fixing mechanism according to the prior art.

FIG. 12 is a conceptual diagram showing an example of a landing pattern on the phosphor screen of the CRT 1 depending on the position (front and rear) of a deflection yoke attached to the CRT.

FIG. 13 is a conceptual diagram showing convergence and raster distortion depending on the position (up, down, left and right) of a deflection yoke attached to a CRT.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... CRT (cathode ray tube), 2 ... Band, 4 ... Deflection yoke, 20a-20d ... Protrusion, 21a-21d ...
... Locking claws, 22a to 22d ... Locking claws, 23a to 23d
... locking claw, 24 ... locking claw, 24a ... tongue piece, 25 ...
... Locking claw, 25a ... Tongue piece

Claims (4)

[Claims] 1. A deflection yoke fixing mechanism for fixing a deflection yoke to a funnel portion of a cathode ray tube, wherein a plurality of projection portions are provided on a funnel portion of the cathode ray tube, and the plurality of projection portions on an opening side of the deflection yoke. A plurality of locking claws are provided at positions corresponding to the above, and when attaching the deflection yoke to the cathode ray tube, the plurality of projections and the plurality of locking claws are fitted to each other, so that the deflection yoke is A deflection yoke fixing mechanism, which is fixed. 2. The deflection yoke fixing mechanism according to claim 1, wherein the plurality of locking claws have a structure for locking by sandwiching the plurality of projections. 3. The deflection yoke fixing mechanism according to claim 1, wherein the plurality of locking claws have a structure for locking by enclosing the plurality of projections. 4. The tongue having elasticity for pressing the plurality of projections in a state where the plurality of engagement claws are fitted to the plurality of projections in order to mount the deflection yoke on the cathode ray tube. The deflection yoke fixing mechanism according to claim 3, comprising a piece.