JPH0748359B2 - Deflection yoke - Google Patents

Description

The present invention relates to a deflection yoke suitable for use in a high definition CRT display device and the like.

[Conventional technology]

In recent years, as CRT display devices have become larger in size and wider in deflection, deflection yokes used in these display devices are required to have higher quality characteristics.
One of the major conditions required for such a deflection yoke is to be able to reproduce the winding distribution of the horizontal deflection coil and the vertical deflection coil at the time of manufacture with the winding distribution as originally designed. As such a deflection yoke,
There is a so-called Clarkla type deflection yoke in which a hull-shaped horizontal deflection coil and a hull-shaped vertical deflection coil obtained by directly winding a conductor wire on a hull-shaped coil winding frame provided with a guide groove of the coil winding are combined. As shown in FIG. 5, a plurality of wire guide grooves 1 extending in the axial direction of the winding frame are provided on the inner surface of the coil-shaped coil winding 8 ', and a front opening bend portion A of the coil winding frame 8'is provided. A plurality of front opening wire guide grooves 3 and a plurality of rear opening wire guide grooves 3'for folding back and guiding the wire are provided in each of the front and rear opening bend portions B, and each wire guide groove 1, 3 of this coil winding frame 8'is provided. , 3'are wound around the lead wire in a square shape to form a horizontal deflection coil and a vertical deflection coil, and the bend portion A, on the outer surface of the coil winding frame wound with the horizontal deflection coil,
A coil winding frame wound with a vertical deflection coil is mounted between B, and a ferrite core is mounted outside the coil winding frame wound with the vertical deflection coil to form a deflection yoke. By the way, generally, the convergence characteristic of the deflection yoke is expressed by the following relational expression, and when it is schematically shown, it is expressed as shown in FIG.

Trilemma = X _H + P _QV -Y _H This trilemma is significantly increased in the negative direction due to the larger screen, and as shown in Fig. 4.
It causes an increase in pincushion distortion in the upper and lower directions of the CRT screen. In order to improve such a trilemma and pincushion distortion, the starting point V _S of the vertical deflection magnetic field V is extended from the starting point H _S of the horizontal deflection magnetic field H to the neck side of the cathode ray tube as shown in FIG. 2 (b). It is known to be good. As one of the improving means, as shown in FIG. 6 of the related art, a vertical auxiliary coil 9 is arranged on the neck side of a deflection yoke, a vertical deflection current is passed through the coil 9, and a vertical deflection coil 10 is formed. A correction magnetic field F generated by the vertical auxiliary coil 9 is added to the magnetic field V to form a magnetic field distribution such that the vertical magnetic field is extended to the neck side of the cathode ray tube, whereby the trilemma and the pincushion distortion in the upper and lower directions of the screen are reduced. I was trying to improve.

[Problems to be Solved by the Invention]

The above-mentioned conventional method improves the trilemma and the upper and lower bobbin winding distortions. However, in the conventional method, it is necessary to generate a correction magnetic field different from the magnetic field generated by the deflection yoke, and it is necessary to provide a vertical auxiliary coil for generating this correction magnetic field. Further, when the vertical auxiliary coil is used, the correction magnetic field formed by the vertical auxiliary coil causes a strong local magnetic field to act on the electron beam on the neck side of the cathode ray tube, which results in a new higher-order convergence error or higher-order convergence error. However, there is a problem in that the distortion of the deflection yoke is caused and the quality of the deflection yoke is degraded.

The present invention provides a deflection yoke which has a simple structure, solves the above-mentioned drawbacks, and has excellent convergence characteristics and deflection characteristics.

[Means for Solving the Problems]

A plurality of conductor wire guide grooves extending in the axial direction of the winding frame on the inner surfaces of the pair of paddle-shaped coil winding frames, and a front opening portion for guiding the conductive wire back to each of the front opening bend portion and the rear opening bend portion of the coil winding frame. A plurality of conducting wire guide grooves and rear opening conducting wire guide grooves are provided, a horizontal deflection coil is wound around the coil winding frame, and a vertical deflection coil is arranged on the outer surface of the coil winding frame. The rear opening of the frame is formed in a bendless shape, and the conductor guide groove provided in the rear bendless opening is a groove having a depth in a direction parallel to the winding frame axial direction, and the depth of the rear opening conductor guide groove is The winding thickness of the coil winding in the rear bendless opening is made by winding the horizontal deflection coil along the conducting wire guide groove of this cushion coil winding without making the winding depth shallower from the winding start groove to the winding end groove. In addition to reducing the number, the vertical deflection coil is arranged so as to be positioned from the rear bendless opening of the hull-shaped coil frame around which the horizontal deflection coil is wound to the rear of the cathode ray tube neck side, and the deflection magnetic field of the vertical deflection coil is started. The point is shifted from the starting point of the horizontal deflection magnetic field to the position on the neck portion side of the cathode ray tube to correct misconvergence and raster distortion.

[Action]

The rear opening of the hull-shaped coil winding frame is formed in a bendless,
This rear bendless opening is provided with a conductor guide groove that is substantially parallel to the axial direction of the winding frame, and the depth of this conductor guide groove is gradually reduced from the winding start groove to the winding end groove of the conductor. The horizontal deflection coil conducting wire wound around the hull-shaped coil winding frame is guided by the guide grooves formed in the rear shallow bendless opening in order to be folded back and wound in sequence, so that the coil winding frame in the rear bendless opening is wound. The thickness in the diametrical direction hardly increases, and the thickness greatly decreases. As a result, the vertical deflection coil can be mounted so as to cover the rear bendless opening of the double-sided coil winding frame of the horizontal deflection coil, so that the vertical deflection coil can be arranged closer to the neck side of the cathode ray tube than the horizontal deflection coil. Becomes With such a configuration, the starting point of the vertical deflection magnetic field extends from the starting point of the horizontal deflection magnetic field to the neck side of the cathode ray tube, and misconvergence and deflection distortion can be improved.

〔Example〕

FIG. 1 shows an embodiment of a hull-shaped horizontal deflection coil winding frame used in the deflection yoke of the present invention. FIG. 1 (a) is its front view, FIG. 1 (b) is its plan view, and FIG. Is a bottom view thereof, and FIG. 3D is a rear view thereof. The saddle-shaped horizontal deflection coil winding frame 8 is provided with a bend insulating plate 4 and a bend wall 7 that form a bend portion in the front opening, and a wire guide groove 3 is formed between the bend walls 7 to form the bend insulating plate 4. A front crossover guide groove 5 for the lead wire to be folded back is formed between the bend wall 7 and the bend wall 7. Further, a plurality of conductor guide grooves 1 extending in the winding frame axial direction Z are provided on the inner surface of the coil winding frame 8. Further, the rear opening of the paddle coil winding frame 8 is formed in a bendless shape, and a plurality of rear bendless openings having a depth in a direction parallel to the winding frame axial direction Z are provided on the rear bendless opening side 8 '. The wire guide groove 2 is formed. The conductor guide groove 2 of the rear bendless opening has a groove depth from the winding start groove (C side) to the winding end groove (D side) of the conductor.
It is formed so that it gradually becomes shallower. A protective cover 6 is fitted to the outside of the lead wire guide groove 2 in the rear bendless opening B ′ of the paddle-shaped coil winding frame 8 if necessary.
The horizontal deflection coil is wound along each of the wire guide grooves 1, 2, 3 of the hook-shaped coil winding frame 8 configured as described above. In this way, the vertical deflection coil is arranged so as to be located closer to the cathode ray tube neck side than the horizontal deflection coil while covering the outside of the rear bendless opening B ′ of the horizontal deflection coil winding frame 8 wound with the horizontal deflection coil. . By constructing the deflection yoke in this manner, the deflection magnetic field starting point of the vertical deflection coil is displaced from the horizontal deflection magnetic field starting point to the neck side of the cathode ray tube, so that misconvergence and raster distortion are corrected. There is no difference in the object and effect of the present invention regardless of whether the vertical deflection coil is a paddle coil or a toroidal coil.

〔The invention's effect〕

According to the deflection yoke of the present invention, the starting point of the vertical deflection magnetic field is set to the cathode ray tube from the starting point of the horizontal deflection magnetic field without forming a forced and local correction magnetic field by using the vertical auxiliary coil as in the prior art. Can be easily extended to the neck side. Moreover, a deflection yoke having good convergence characteristics and deflection characteristics over the entire CRT screen can be obtained without occurrence of high-order misconvergence or deflection distortion. Moreover, the effect of the present invention is great in that it can be obtained by an extremely simple and inexpensive means.

[Brief description of drawings]

1A and 1B are explanatory views showing an embodiment of the hull-shaped coil winding frame used in the deflection yoke of the present invention. FIG. 1A is its front view, FIG. 1B is its plan view, and FIG. (C) is a bottom view thereof, (d) is a rear view thereof, FIG. 2 is an explanatory view of the configuration of the deflection yoke of the present invention and the magnetic field distribution, FIG. 3 is an explanatory view of misconvergence, and FIG. 4 is FIG. 5 is an explanatory view of a deflection distortion, FIG. 5 is an explanatory view of a conventional coil winding frame, FIG. 5A is a front view thereof, FIG. 5B is a plan view thereof, and FIG. 5C is a bottom view thereof. FIG. 6 is an explanatory view of the configuration of a conventional deflection yoke and the magnetic field distribution. 1,2,3,3 '... Conductor guide groove, 4,4' ... Bend insulation plate, 6
...... Protective cover, 7,7 '... Bend wall, 8,8' ... Coil bobbin, A ... Front opening bend part, B ... Rear opening bend part, B '... Rear bendless opening part.

Claims (1)

[Claims] 1. A deflection yoke used for a cathode ray tube, comprising a plurality of conducting wire guide grooves extending in an axial direction of a winding frame on an inner surface of a pair of coil-shaped coil winding frames, and a front opening bend portion of the coil winding frame. A plurality of front opening conductor guide grooves and a plurality of rear opening conductor guide grooves for guiding the conductor wire back and forth are provided in each of the front and rear opening bend portions, and a horizontal deflection coil is wound around the coil winding frame, and the outer surface of the coil winding frame is further provided. In the deflection yoke in which the vertical deflection coil is arranged, the rear opening of the paddle-shaped coil winding frame is formed in a bendless shape, and a conductor guide groove provided in the rear bendless opening is formed in a direction parallel to the winding frame axial direction. And the depth of the rear opening conductor wire guide groove is gradually made shallower from the winding start groove to the winding end groove of the conductor wire, and the horizontal deflection coil is wound along the conductor wire guide groove of this slat coil winding frame. do it The thickness in the diametrical direction of the coil winding frame in the one bendless opening is reduced, and the vertical deflection coil is extended from the rear bendless opening of the square coil winding frame wound by the horizontal deflection coil to the rear side of the cathode ray tube neck side. The vertical deflection coil is arranged so as to be positioned so that the deflection magnetic field starting point of the vertical deflection coil is shifted toward the neck portion side of the cathode ray tube from the deflection magnetic field starting point of the horizontal deflection coil to correct misconvergence and raster distortion. Deflection yoke to do.