JPH0311800Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a deflection device used in an in-line color cathode ray tube. The present invention relates to a deflection device that corrects convergence deviation.

<Prior Art> In this type of deflection device, which has a pair of horizontal deflection coils and a pair of vertical deflection coils, and corrects convergence deviation by changing the circuit impedance of the horizontal deflection coil with the vertical deflection period, the horizontal deflection Conventionally, as a means for differentially changing the circuit impedance of the coils in the vertical deflection period, horizontal deflection coils 8 and 8' are connected in series to the ferrite core 3, as shown in FIGS. 4a and 4b. Wind each horizontal auxiliary coil 1, 1', 2, 2',
Further, vertical auxiliary coils 10, 10', 11, 11' connected in series with each vertical deflection coil 9, 9' are wound on each of these horizontal auxiliary coils 1, 1', 2, 2'. A saturable reactor is formed by disposing a magnet 4 for applying a magnetic bias to the horizontal auxiliary coils 10, 10', 11, 11' by passing a vertical deflection current through the vertical auxiliary coils 10, 10', 11, 11'. By changing the impedance of 2 and 2' in the vertical deflection period, the magnitude of the horizontal deflection current flowing through each horizontal deflection coil 8 and 8' is differentially changed. As another means, as shown in FIGS. 5a and 5b, horizontal auxiliary coils 1, 1', 2, 2' each wound around a ferrite core 3 and magnetically biased by a magnet 4 are used. In addition to being connected in series with a pair of horizontal deflection coils 8 and 8', these horizontal auxiliary coils 1, 1', 2, and 2' are arranged in close proximity to the annular core 12 of the deflection device, so that the air is emitted from the annular core 12. By changing the impedance of the horizontal auxiliary coils 1, 1', 2, and 2' in the vertical deflection period using the vertical deflection magnetic flux generated by It was changing.

<Problem to be solved by the invention> However, in the former case, the conventional deflection device described above changes the circuit impedance of the horizontal deflection coil with the vertical deflection period, but the vertical auxiliary coil corresponding to each horizontal auxiliary coil is In addition, since the horizontal auxiliary coil and vertical auxiliary coil, which have a large potential difference, are wound around the same ferrite core, it is necessary to provide sufficient insulation between the two coils, so the ferrite core becomes larger. A drawback was that the deflection device as a whole had to be large. In the latter case, the impedance of the horizontal auxiliary coil is changed in the vertical deflection period by using the vertical deflection magnetic flux emitted from the annular core of the deflection device, so the vertical auxiliary coil used in the former method is This made it possible to make the device smaller by eliminating the need for a coil, but the biggest drawback was that
Since the magnitude of the vertical deflection magnetic flux emitted from the annular core of the deflection device is determined by the dimensions of both sides of the cathode ray tube used, the circuit impedance of the horizontal deflection coil changes with the vertical deflection period. In other words, there is a limit to the amount of change in the vertical deflection current, which places a large restriction on the amount of correction for the convergence shift.

In addition, in this type of deflection device, it is inevitable that manufacturing variations occur in the magnetic core, coil, deflection coil, etc., so when assembling a color receiver, characteristics must be adjusted while checking compatibility with the color receiver. ing. Since it is difficult to replace the magnetic core or coil, it is reasonable to perform this adjustment by preparing several types of magnetic bias magnets and replacing them. However, conventional deflection devices do not take such an adjustment method into account, and the adjustment work is not easy.

<Means for Solving the Problems> The present invention aims to eliminate the various drawbacks of the conventional deflection devices described above, and to provide a deflection device that is small in size, has excellent convergence deviation correction, and has a structure that is easy to assemble and adjust. In a color picture tube deflection device equipped with a pair of upper and lower horizontal deflection coils and a vertical deflection coil, two I-shaped drum-shaped magnets arranged with their magnetic core axes substantially parallel are used. A horizontal auxiliary coil is wound around each of the cores, and the two horizontal auxiliary coils are arranged in substantially parallel and connected in series so that the magnetic directions are opposite to each other, and one end of the two drum-shaped magnetic cores. One magnetic bias magnet is placed across the sides to form a U-shaped set, and two sets of these U-shaped sets are placed with their other ends facing each other and stored in an insulating case. and a vertical auxiliary coil is wound around the outer periphery of the insulating case, one horizontal auxiliary coil of the two sets is connected in series with the upper one of the pair of horizontal deflection coils, The other horizontal auxiliary coil is connected in series with the lower one of the pair of horizontal deflection coils, and the vertical auxiliary coil is connected in series with the vertical deflection coil.

In the above configuration, it is preferable that the flange on the other end side of the U-shaped drum-shaped magnetic core is thicker than the flange thickness on the one end side.

<Operation and Embodiments> The present invention will be described below with reference to the embodiments shown in FIGS. 1 to 3. Fig. 1a is an external side view showing an embodiment of the deflection device according to the invention, Fig. 1b is a sectional side view of the main part of the invention, Fig. 2 is a connection diagram of the deflection coil of the invention, and Fig. 3 FIG. 2 is a sectional side view of a main part of another embodiment of the present invention.

In the figure, coils 1 and 1' are horizontal auxiliary coils connected in series with an upper horizontal deflection coil 8, and coils 2 and 2' are connected in series with a lower horizontal deflection coil 8'. and 1' and 2
and 2' are respectively wound around a drum-shaped ferrite core 3, and the upper horizontal auxiliary coils 1 and 1' are connected in series so that the magnetic fields φ _H and φ' _H are in opposite directions as shown in FIG. 1b. Similarly, the lower horizontal auxiliary coils 2 and 2' are connected in series so that the magnetic fields φ _H and φ' _H are in opposite directions, and the horizontal auxiliary coils 1, 1' and 2, 2' Magnets 4 and 4' for applying DC magnetic bias are respectively arranged with the same poles facing each other. Although the north poles are shown facing each other in the figure, the south poles may be facing each other. Now, the horizontal auxiliary coils 1 and 1' and 2 and 2' formed in this way are arranged such that the upper horizontal auxiliary coils 1 and 1' are approximately parallel to each other, and similarly the lower horizontal auxiliary coils 2 and 2' are approximately parallel to each other. Place it in
Moreover, each drum-shaped ferrite core 3 of the upper horizontal auxiliary coil 1, 1' and the lower horizontal auxiliary coil 2, 2'
It is housed in an insulating case 6 together with magnets 4 and 4', which are arranged so that the flange surfaces on one side face each other and apply a magnetic bias. Further, a coil 6 connected in series with a pair of vertical deflection coils 9, 9' is wound on the outer periphery of the insulating case 6 in which the horizontal auxiliary coils 1, 1' and 2, 2' are housed. , constitute the coil unit 7. In the deflection device equipped with the coil unit 7 configured as described above, when a vertical deflection current flows through the coil 5, a vertical deflection magnetic flux is generated from the coil 5 that changes with the vertical deflection period, and this vertical deflection magnetic flux The upper horizontal auxiliary coils 1, 1' and the lower horizontal auxiliary coils 2,
2' indicates that when the upper horizontal auxiliary coils 1, 1' tend to be saturated, the lower horizontal auxiliary coils 2, 2' tend to be unsaturated, and the lower horizontal auxiliary coils 2, 2' tend to be saturated. upper horizontal auxiliary coil 1,
The circuit impedance of the upper horizontal deflection coil 8 and the circuit impedance of the lower horizontal deflection coil 8' are varied differentially by repeating such changes in the vertical deflection period that 1' tends to be unsaturated. let As a result, the amplitude of the current flowing through the upper horizontal deflection coil 8 and the current flowing through the lower horizontal deflection coil 8' is modulated by the vertical deflection period, and when the horizontal deflection magnetic field distribution has a barrel tendency on the upper side, a pink tension tendency on the lower side; When there is an upper pinking tendency, the lower side becomes a barreling tendency, and the convergence deviation, so-called trilemma, is corrected.
In this case, the magnetic fields φ _H , φ′ _H generated from the upper horizontal auxiliary coils 1 and 1′, respectively, and the magnetic fields φ _H , φ′ _H generated from the lower horizontal auxiliary coils 2 and 2′, respectively, are in the closed magnetic path. It has the advantage of being able to obtain inductance extremely efficiently.
It becomes possible to reduce the number of turns of the horizontal deflection coil, and reducing the number of turns has the effect of reducing heat generation of the horizontal auxiliary coil.

In addition, in the configuration of the above-described invention, as shown in FIG. By configuring the opposing brim thickness of the ferrite core 3 to be thick,
Since the effect of the coil 5 as a magnetic core is enhanced and the efficiency is improved, it is also possible to reduce the number of turns of the coil 5.

Note that when assembling and adjusting the color receiver, the upper horizontal auxiliary coils 1, 1' and the lower horizontal auxiliary coils 2,
Since the 2' coil itself cannot be adjusted,
The characteristics are adjusted by replacing the magnetic bias magnets 4 and 4', but in the structure of the present invention, the magnetic bias magnet 4 and the magnetic bias magnet 4' have the same polarity facing each other, so that they cannot be mutually disposed. Therefore, the adjustment of the upper horizontal auxiliary coils 1, 1' by the magnetic bias magnet 4 and the adjustment of the lower horizontal auxiliary coils 2, 2' by the magnetic bias magnet 4' can be performed independently. Therefore, adjustments can be made easily and in a short period of time. That is, there is an effect that the number of steps required for assembling a color receiver can be reduced.

<Effects of the invention> As described above, the tendency device according to the invention is equipped with a coil for generating magnetic flux that changes with the vertical deflection period, so that the saturation characteristics of the horizontal auxiliary coil can be arbitrarily selected, and the convergence deviation is reduced. The degree of freedom in correction has been significantly improved.

In addition, each horizontal auxiliary coil is housed in one insulating case, and the vertical deflection magnetic flux generating coil is wound around the outer periphery of the insulating case to form an integrated coil unit. This has made it possible to sufficiently improve the withstand voltage between the two and to make it possible to downsize the deflection device.

In addition, the horizontal auxiliary coil of the present invention is configured to form a closed magnetic path between the upper horizontal auxiliary coil and the lower horizontal auxiliary coil, so it has the advantage that inductance can be obtained extremely efficiently.
It is possible to reduce the number of turns of the horizontal auxiliary coil, and reducing the number of turns has the effect of reducing heat generation of the coil.

Furthermore, by increasing the thickness of the opposing inner ribs of the drum-shaped core of the horizontal auxiliary coil, it is possible to increase the magnetic core efficiency of the vertical deflection magnetic flux generating coil, thereby improving the vertical deflection magnetic flux generation efficiency.

Furthermore, when assembling and adjusting the color receiver, the two magnetic bias magnets can be replaced independently and without interference, which facilitates the adjustment operation and shortens the adjustment time.

[Brief explanation of the drawing]

FIG. 1a is a side view of a deflection device according to an embodiment of the present invention, FIG. Fourth sectional side view of main parts according to another embodiment of the invention
The figure shows a conventional example; figure a is a side sectional view of the horizontal and vertical auxiliary coils, figure b is a connection diagram of the deflection coil, figure 5 shows another conventional example, figure a is the deflection device. The rear view, Figure b, shows a connection diagram of the deflection coil. Explanation of symbols, 1, 1'...Upper horizontal auxiliary coil,
2, 2'... Lower horizontal auxiliary coil, 3... Drum type ferrite core, 4, 4'... Magnet, 5
... Coil, 6 ... Insulation case, 7 ... Coil unit, 8 ... Upper horizontal deflection coil, 8' ... Lower horizontal deflection coil, 9,9' ... Vertical deflection coil,
12... Annular core.

Claims (1)

[Claims for Utility Model Registration] 1. In a deflection device for a color picture tube equipped with a pair of upper and lower horizontal deflection coils and a vertical deflection coil, two I-shaped deflection devices arranged with their magnetic core axes substantially parallel to each other are provided. A horizontal auxiliary coil is wound around each of the drum-shaped magnetic cores, and the two horizontal auxiliary coils are arranged in parallel and connected in series so that their magnetic directions are opposite to each other. One magnetic bias magnet is placed across one end of the core to form a U-shaped set as a whole.
Two sets of these U-shaped sets are arranged with their other ends facing each other, and are housed in an insulating case, and a vertical auxiliary coil is wound around the outer periphery of the insulating case, and one of the two sets is the horizontal auxiliary coil is connected in series with the upper one of the pair of horizontal deflection coils; the other horizontal auxiliary coil of the two sets is connected in series with the lower one of the pair of horizontal deflection coils; A deflection device characterized in that a vertical auxiliary coil is connected in series with the vertical deflection coil. 2 Utility model registration claim 1, characterized in that the flange on the other end of the U-shaped drum-shaped magnetic core is formed thicker than the flange on the one end. deflection device.