JP2699446B2 - Deflection yoke - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke installed in a cathode ray tube of a television receiver or the like.

2. Description of the Related Art For example, there is a large video projector that projects images of primary colors of red, blue, and green onto a screen using independent cathode ray tubes and synthesizes images of three primary colors on the screen. In the case of such a configuration, the degree of deviation of the image of each primary color, that is, the convergence is adjusted by individually changing the position and shape of the raster for each cathode ray tube. Generally, a kind of deflecting yoke called a convergence yoke is provided in each cathode ray tube, thereby deflecting an electron beam that forms an image.

Hereinafter, an example of a conventional convergence yoke will be described. FIG. 7 is a perspective view of a main part of the convergence yoke, and FIG. 8 is a plan view of the convergence yoke. 7 and 8, reference numeral 21 denotes an annular magnetic core, and 22, 23, 24, and 25 denote protrusions formed so as to protrude inside the magnetic core 1, and a protrusion 22 therein. , 23 are disposed so as to face each other in the vertical direction, and the protrusion 2
4, 25 are arranged so as to oppose each other in the lateral direction.
Reference numerals 26, 27, 28 and 29 denote coil bobbins, each of which is provided with a coil 30 by winding a conductive wire. Each of the coil bobbins 26, 27, 28, 29 has a protrusion 22, 23, 24, 25 of the magnetic core 1.
It is fitted in. The tips of the projections 22, 23, 24, 25 are cut so as to fit the neck of the cathode ray tube. FIG. 9 shows a state in which the convergence yoke configured as described above is mounted on the cathode pipe 16.

Problems to be Solved by the Invention In the above configuration, the coil bobbins 26, 27,
In order for the protrusions 28, 29 to be fitted into the protrusions 22, 23, 24, 25 of the core, the cross section of each protrusion must be sized and shaped so as to be able to pass through the through hole of the coil bobbin. However, for example, as shown in FIG.
The same applies to 3, 24, and 25), which face the cathode ray tube at the tip, so that the shape must be designed in consideration of the magnetic field distribution in the cathode ray tube. In order to obtain a larger deflection amount with a small magnetomotive force, it is desirable to increase the width of the opposed portion 26 in the tube axis direction, that is, the vertical width L, and the width of the opposed portion 26 in the direction perpendicular to the tube axis direction. That is, when the width W is increased, a desired magnetic field can be obtained in a wider range. However, in the conventional configuration, the size and the shape of the tip of the protruding portion, that is, the facing portion facing the cathode ray tube are limited in order to pass through the bobbin, so that better characteristics cannot be pursued.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a deflection yoke that can make the size and shape of a cathode ray tube facing portion appropriate without affecting other portions. With the goal.

Means for Solving the Problems According to the present invention, to solve the above problems, the magnetic pieces are engaged by engagement claws provided at the end of the coil bobbin on which the protrusion is inserted and on the opposite end.

Operation With this configuration, the magnetic piece is easily positioned by the engagement claw, and the efficiency of the magnetic field can be improved.

Embodiment Hereinafter, an example of a convergence yoke for a video projector will be described as an embodiment of a deflection yoke according to the present invention with reference to the drawings. FIG. 1 is a perspective view of a main part of a convergence yoke in the present embodiment, and FIG. 2 is a plan view of the convergence yoke. In FIG. 1 and FIG. 2, reference numeral 1 denotes an annular magnetic core, and reference numerals 2, 3, 4, and 5 denote protrusions formed on the magnetic core 1 so as to protrude inward. 6, 7, 8, and 9 are coil bobbins, and 10 is a coil provided by winding a conductive wire around the coil bobbin 6. The other coil bobbins 7, 8, and 9 are similarly provided with coils. Each of the coil bobbins 6, 7, 8, 9 is provided with a protrusion 2, 3,
Numerals 11, 12, 13, and 14 fitted in 4, 5 are magnetic pieces made of a magnetic metal plate, and are bent to fit the neck of the cathode ray tube.

3 and 4 are a plan view and a side view showing the coil bobbin 6 and the magnetic piece 11, respectively. In FIGS. 3 and 4, reference numeral 15 denotes a claw that engages with the magnetic piece 11. The magnetic piece 11 is temporarily held on the coil bobbin 6 by the claws 15 in the assembly process. That is, as shown in FIG. 5, in the assembling process, the magnetic piece 11 is temporarily held on the coil bobbin 6, and
In this state, the coil bobbin 6 is attached to the protrusion 2. Similarly, the other coil bobbins 7, 8, 9 are provided with claws for temporarily holding the magnetic pieces, and are similarly attached to the protruding portions 3, 4, 5 while temporarily holding the magnetic pieces. In this case, an adhesive is applied to the protruding portions 2, 3, 4, 5 and the coil bobbins 6, 7, 8, 9, and the coil bobbins 6, 7, 8, 9 are protruded by the adhesive. , 5.

FIG. 6 shows a state in which the convergence yoke constructed as described above is mounted on the cathode ray tube 16. Sixth
As shown in the figure, for example, the size of the cross section of the protrusion 3 is a size that allows the coil bobbin 7 to be fitted, and yet the magnetic piece 12 facing the cathode ray tube 16
Is designed to be large considering the magnetic field distribution in the cathode ray tube 16. That is, in order to obtain a larger deflection amount with a small magnetomotive force, the vertical width L is very large, and the horizontal width W of the facing portion is also large.

Effect of the Invention As described above, according to the present invention, the magnetic piece is easily engaged with the engaging claw provided at the end opposite to the side into which the projecting portion of the coil bobbin is inserted. In this way, it can be easily fixed without displacement, and the deflection amount can be efficiently and reliably performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of the convergence yoke in the present embodiment, FIG. 2 is a plan view of the convergence yoke, and FIG. 3 is a view of a coil bobbin and a magnetic piece of the convergence yoke as shown by an arrow A in FIG. FIG. 4 is a side view showing the coil bobbin and the magnetic piece, FIG. 5 is an explanatory view showing how the convergence yoke is assembled, and FIG. 6 is a state in which the convergence yoke is mounted on a cathode ray tube. FIG. 7 is a perspective view of a main part of a conventional convergence yoke, FIG. 8 is a plan view of the convergence yoke,
FIG. 9 is a side view showing a state where the convergence yoke is mounted on a cathode ray tube. 1 ... magnetic core, 2,3,4,5 ... projection 6,7,8,9 ... coil bobbin 10 ... coil 11,12,13,14 ... magnetic piece 15 ... claw, 16 ... Cathode ray tube

Claims (1)

(57) [Claims] 1. An annular magnetic core, a plurality of protrusions integrally protruding in an inner circumferential direction from an inner circumferential wall of the magnetic core, a coil bobbin inserted into the protrusion, and a coil wound around the coil bobbin. Coil that corrects the convergence, and a magnetic piece formed so as to be wider than a cross section orthogonal to the protruding direction of the protruding portion and formed along the curved surface of the cathode ray tube, wherein the magnetic piece is the coil bobbin of the coil bobbin. A deflection yoke, which is engaged with an engagement claw provided at an end opposite to a side on which the protrusion is inserted.