GB2315156A - A deflection yoke for a cathode ray tube - Google Patents

Abstract

A deflection yoke for a cathode ray tube consists of a separator 5 formed from two half-funnel shaped parts around which a horizontal deflecting coil H is wound. To allow the windings to be finely adjusted in order to improve convergence, the parts are formed with holes (8) in which pins 9 can be selectively inserted, the pins locally changing the path of the windings between discontinuous winding slots M and projections 6,7.

Description

DEFLECTION YOKE The present invention relates to a deflection yoke, and particularly to a deflection yoke including a deflecting coil formed in a section-winding manner using a coil bobbin, wherein the coil bobbin has a plurality of through-holes, whereby a winding distribution of a wire can be adjusted more finely than that in a related art deflection yoke by use of pins selectively inserted in the through-holes.

In a related art deflection yoke, a convergence characteristic, etc. have been controlled by adjustment of a winding distribution, and for this purpose, a deflecting coil has been formed in a so-called section-winding manner using winding slots formed in a coil bobbin.

Fig. 6 is a front view of a horizontal deflecting coil H formed in a section-winding manner. The horizontal deflecting coil H is formed by winding a magnet wire around a separator 1 formed into a shape taken as a half of an approximately funnel shape. The separator 1 has L-shaped projections 2 at each of end surfaces thereof both on a funnel bend side and on a neck bend side. Linear projections extending along the tube axis of a cathode-ray tube are formed on an inner side surface of the separator 1 correspondingly to the L-shaped projections 2. Each winding slot M is formed between the adjacent linear projections. In such a deflection yoke, the horizontal deflecting coil H is formed by winding the magnet wire along the winding slots M while catching it on the L-shaped projections on the funnel bend side and neck bend side. At this time, in order to form a desired deflecting magnetic field, a winding distribution is adjusted by forming the horizontal deflecting coil H while suitably selecting arrangement of the winding slots M.

In the related art deflection yoke, however, even if a winding distribution is adjusted by suitably selecting arrangement of the winding slots M, it is actually difficult to entirely correct a misconvergence of the deflection yoke, and consequently, the remaining misconvergence is corrected using an auxiliary device such as a correcting coil.

If the winding distribution can be more finely adjusted, it may be considered that the configuration of the auxiliary device of this type can be simplified, and works for adjustment of convergence and the like can be also simplified.

An object of the present invention is to provide a deflection yoke capable of adjusting a winding distribution more finely than that in the related art deflection yoke.

To achieve the above object, according to the present invention, there is provided a deflection yoke disposed extending from a neck portion of a cathode-ray tube along the tube axis of the cathode-ray tube, including: first and second separators, each of which is formed in a shape taken as a half of a funnel shape; and a magnet wire wound around the first and second separators; wherein at least one of the first and second separators has a plurality of through-holes formed in an outer peripheral portion thereof.

In the above deflection yoke, preferably, pins are selectively inserted in the through-holes, and a horizontal deflecting coil is formed by winding the magnet wire around the first and second separators while catching the magnet wire on the pins. Each of the pins preferably includes an insertion portion and a flange portion. Preferably, the separator has an end surface on the funnel bend side and an end surface on the neck bend side, and L-shaped projections are formed on each of the end surfaces both on the funnel bend side and on the neck bend side. Moreover, linear projections extending in the direction of the cathode-ray tube are preferably formed on an inner side surface of the separator correspondingly to the L-shaped projections.

According to the present invention, the provision of a plurality of through-holes in a coil bobbin along the circumferential direction allows a wire to be restricted in position by use of pins projecting from an inner side surface of the coil bobbin through the through-holes. As a result, by selectively arranging these pins, a winding distribution of the wire can be adjusted more finely than that in the related art deflection yoke.

These and other objects of the invention will be seen by reference to the description, taken in connection with the accompanying drawings, in which: Fig. 1 is a front view of a horizontal deflecting coil according to a first embodiment of the present invention; Fig. 2 is a side view of a separator; Fig. 3 is a side view of the separator, as seen from the opposed side to that in Fig. 2; Fig. 4 is a sectional view taken on line A-A of Fig. 2; Fig. 5 is a perspective view showing another embodiment of the pin; and Fig. 6 is a front view of a related art horizontal deflecting coil.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a front view of a horizontal deflecting coil of a deflection yoke according to a first embodiment of the present invention. The horizontal deflection yoke H is formed in a section-winding manner using a separator 5, followed by combination with another horizontal deflecting coil, and then vertical deflecting coils, a core, and the like are arranged outside the combined horizontal deflecting coils, whereby a deflection yoke is formed.

Figs. 2, 3 show the separate 5, as seen from inside and outside thereof, respectively. As shown in these figures, the separate 5 is formed from resin by injection molding into a shape taken as a half of an approximately funnel shape. The separate 5 has L-shaped projections 6 at each of end surfaces thereof both on the funnel bend side and on the neck bend side. Linear projections 7, which extend along the tube axis of the cathode-ray tube, are formed on an inner side surface of the separate 5 correspondingly to the L-shaped projections 6. Each winding slot M is formed between the adjacent linear projections 7. Thus, the horizontal deflecting coil H is formed around the separate 5 by selectively arranging the winding slots M.

In the separator 5, each of the linear projections 7 is disconnected at a region near the funnel side, and each of the winding slots is disconnected at the region where each projection 7 is disconnected. In the region where each winding slot M is disconnected, the separator 5 has a plurality of through-holes 8 extending along the circumferential direction. Each through-hole 8 is formed into a circular shape, and as shown in Fig. 4 which is a sectional view taken on line A-A of Fig. 2, it is offset in the circumferential direction from the center of the corresponding winding slot M.

In the separator 5, pins 9 are inserted in the through-hole 8 from the outer peripheral side of the separator 5 as needed, and accordingly the horizontal deflecting coil H can be formed in a desired winding distribution by winding the magnet wire around the separator 5 while catching it on the pins 9. Specifically, the pin 9 is fittingly held in the through-hole 8 in a state that a columnar leading end of the pin 9 is inserted in the through-hole 8 and projects from the inner side surface of the separator 5 until a flange 9A formed at the base of the pin 9 is brought in contact with the outer side surface of the separator 5.

At the step of forming the horizontal deflecting coil H of the deflection yoke according to this embodiment, the horizontal deflecting coil H is formed by winding the magnet wire around the separator 5 having the above configuration. As shown in Figs. 1, 2, the pins 9 are inserted in the through-holes 8 of the separator 5 in accordance with the necessary winding distribution and the separator 5 in such a state is then set in a winding machine. The horizontal winding coil H is formed in a section-winding manner using such a winding machine by a manner of winding the magnetic wire along the desired winding slots M while catching it on the L-shaped projections 6 formed at the end surfaces on the funnel bend side and on the neck bend side.

In the above winding, the magnetic wire for the horizontal deflecting coil H is offset from the winding slots M and is caught by the pins 9 at the region where the pins 9 are inserted in the through-holes 8. The winding angle of the magnet wire is thus locally changed at the region where the winding slots M are disconnected, with a result that the winding distribution can be adjusted more finely than that in the case in which the magnetic wire is simply wound along the winding slots.

With this configuration, since the separator 5 has the plurality of through-holes 8 arranged along the circumferential direction, the winding distribution of the horizontal deflecting coil B can be finely adjusted by winding the magnet wire for the horizontal deflecting coil H around the separator 5 while catching it on the pins 9 selectively inserted in the through-holes 8. As a result, it is possible to correspondingly improve the convergence characteristic of the deflection yoke, and also to flexibly adjust changes in characteristics caused at the time of production.

The pin having the columnar leading end corresponding to the circular through-hole has been used in the above embodiment; however, the present invention is not limited thereto and it is to be understood that pins corresponding to through-holes having various shapes may be used. For example, a pin having a flat-shaped leading end shown in Fig. 5 may be inserted in a slit-like throughhole.

The pins have been directly inserted into the separator in the above embodiment; however, the present invention is not limited thereto and it is to be understood that the pins may be inserted by a winding machine. In this case, after winding is performed using the pins, the magnet wire are fixed with adhesive and then the pins are removed.

Although description has been made by example of formation of the horizontal deflecting coil in the above embodiment, such description is for illustrative purpose only, and it is to be understood that the present invention can be extensively applied to formation of a vertical deflecting coil.

Claims (9)

1. A deflection yoke to be disposed extending from a neck portion of a cathode-ray tube along the tube axis of said cathode-ray tube, comprising: first and second separators, each of which is formed in a shape taken as a half of a funnel shape; and a magnet wire wound around said first and second separators; wherein at least one of said first and second separators has a plurality of through-holes formed in an outer peripheral portion thereof.

2. A deflection yoke according to claim 1, comprising pins selectively inserted in said through-holes, wherein a horizontal deflecting coil is formed by winding said magnet wire around said first and second separators while catching said magnet wire on said pins.

3. A deflection yoke according to claim 2, wherein each of said pins comprises an insertion portion and a flange portion.

4. A deflection yoke according to claim 1, 2 or 3 wherein said separator has an end surface on the funnel bend side and an end surface on the neck bend side, and L-shaped projections are formed on each of said end surfaces both on the funnel bend side and on the neck bend side.

5. A deflection yoke according to claim 4, wherein linear projections extending in the direction of said cathode-ray tube are formed on an inner side surface of said separator correspondingly to said L-shaped projections.

6. A cathode-ray tube assembly comprising a cathoderay tube and a deflection yoke according to any preceding claim, wherein the deflection yoke is disposed extending from a neck portion of the cathode-ray tube along the tube axis of said cathode-ray tube.

7. A method of constructing a deflection yoke according to any preceding claim, the method comprising: selectively inserting pins into said through holes; and winding said magnet wire around said first and second separators while catching said magnet wire on said pins.

8. A deflection yoke constructed and arranged substantially as hereinbefore described with reference to and as illustrated by Figures 1 to 5 of the accompanying drawings.

9. A method of constructing a deflection yoke substantially as hereinbefore described with reference to and as illustrated by Figures 1 to 5 of the accompanying drawings.