JPS645820Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a color television receiver, in particular,
The present invention relates to a deflection yoke device for an in-line color picture tube in which a plurality of (usually three) electron guns are arranged in-line.

As is well known, in a color picture tube in which multiple electron guns (usually three electron guns, blue, green, and red) are arranged horizontally in-line, the electron guns on both sides are Due to displacement in the rotational direction (gun rotation) or unbalance of the horizontal deflection magnetic field generated by the horizontal deflection coil of the deflection yoke mounted on the picture tube, etc. , B, the electron beam B from the blue gun may cause a downward or upward arcuate misconvergence with respect to the electron beam R from the red gun on the horizontal center line of the screen.

Conventionally, the above-mentioned misconvergence correction was
A pair of magnets is mounted facing each other on the tail side of a vertical deflection coil that is toroidally wound around a core that forms part of the deflection yoke, and the horizontal deflection magnetic field distribution generated from the horizontal deflection coil is determined by the magnetic field from the magnet. This was done by locally changing the temperature. However, in such a configuration,
Although the arcuate misconvergence is corrected, the magnetic field from the magnet adversely affects other deflection characteristics, such as landing characteristics, and as a result, it is extremely difficult to obtain good screen characteristics.

The present invention relates to a deflection yoke device made in view of the above-mentioned matters, and in particular has a configuration that can always obtain good screen characteristics without adversely affecting other deflection characteristics when correcting bow-shaped misconvergence. This invention relates to a deflection yoke device.

Hereinafter, one embodiment of the deflection yoke device of the present invention will be described in detail with reference to the drawings. FIGS. 2 and 3 show a partially sectional side view and a front view of an embodiment of the deflection yoke device of the present invention.
is a deflection yoke body, which is made up of a pair of horizontal deflection coils 2a, 2b wound in a saddle shape, and horizontal deflection coils 2a, 2b arranged on the inner surface of the tube symmetrically vertically with respect to the tube axis. a coil bobbin 3 and an annular core 4 arranged on the outer surface of the coil bobbin 3
and a vertical deflection coil 5 toroidally wound around a core 4.Through a tightening means 6 formed at the rear end of the coil bobbin 3, three of the blue guns 7, green guns 8, and red guns 9 are connected. A real electron gun is mounted and fixed on a picture tube 10 arranged in-line in a horizontal direction with respect to the tube axis. The rear enlarged portion 3a of the coil bobbin 3 constituting the deflection yoke main body 1 includes:
The differential coil 11 is attached and fixed. Differential coil 1
1, as shown in FIG. 4, horizontal deflection coils 2a,
2b, and for the downward arcuate misconvergence shown in FIG. 1A, the horizontal deflection coil 2a located above the tube axis of the differential coil 11 as shown in FIG. A diode 12 is connected in parallel between the side end 11a and the approximately midpoint 11b, and in order to prevent the upward arcuate misconvergence shown in FIG. 1B, as shown in FIG. Horizontal deflection coil 2b located at the bottom with respect to the tube axis
A diode 12 is connected in parallel between the side end 11c and approximately the middle point 11b.

In the deflection yoke device having such a configuration, correction will be made below when the electron beam B from the blue gun 7 causes a downward arcuate misconvergence (shown in FIG. 1A) with respect to the electron beam R from the red gun 9. explain. In this case, horizontal deflection coil 2
A differential coil 11 is connected in series between a and 2b, and a diode 12 is connected in parallel between the end 11a of the differential coil 11 on the horizontal deflection coil 2a side and the midpoint 11b.
The horizontal sawtooth wave current flowing through the differential coil 11 is connected to the coil 2 as shown in FIG.
The a-side half is bypassed by the diode 12, and the differential becomes ineffective in that part (indicated by A in the figure). (When the diode 12 is not connected, the current waveform in the half of the coil 2a is shown by the dotted line H.) As a result, the current has a shape in which the amount of magnetic field applied to the blue beam B increases compared to the red beam R, and the first The misconvergence of the lower bow of the blue beam B shown in FIG. A is corrected. Next, a description will be given of correction when the blue beam B causes an upward arcuate misconvergence (shown in FIG. 1B) with respect to the red beam R. In this case, horizontal deflection coils 2a, 2
For the differential coil 11 connected in series between
The diode 12 is located at the end 1 on the horizontal deflection coil 2b side.
It is connected in parallel between 1c and midpoint 11b,
As shown in FIG. 7, the horizontal sawtooth wave current flowing through the differential coil 11 is bypassed by the diode 12 in the half on the coil 2b side, and the differential is no longer active in that part (indicated by C in the figure). When the diode 12 is not connected, the current waveform in the half on the coil 2b side is as shown by the dotted line H. As a result, the current has a shape in which the amount of magnetic field applied to the blue beam B is reduced compared to the red beam R, and This corrects the upward arcuate misconvergence of the blue beam B shown in FIG. 1B.

As described above, according to the deflection yoke device of the present invention, the differential coil is connected in series to a pair of horizontal deflection coils wound in a saddle shape, and the differential coil is connected between one end of the differential coil and approximately the midpoint. It has a simple and inexpensive configuration, and can correct bow-shaped misconvergence without adversely affecting other deflection characteristics, ensuring always good screen characteristics. With the available products, it is now possible to use a deflection yoke that causes arcuate misconvergence, which was previously considered unusable, or a picture tube that has gun rotation and results in arcuate misconvergence. , material costs etc. are reduced accordingly, and the practical effects are great.

[Brief explanation of the drawing]

Figures 1A and B are explanatory diagrams of the arcuate misconvergence of the electron beam from the blue gun and the electron beam from the red gun that occurs on the screen, and Figure 2 is a part of the deflection yoke device in one embodiment of the present invention. 3 is a front view, FIG. 4 is a horizontal deflection coil connection circuit diagram showing the connection state of the differential coil, and FIG. 5 is a differential coil connection in another embodiment of the present invention. The horizontal deflection coil connection circuit diagrams, Figures 6 and 7, showing the status are shown in Figures 4 and 7, respectively.
FIG. 6 is a schematic diagram of a horizontal current waveform generated by the differential coil of the connection circuit diagram shown in FIG. 5; 1... Deflection yoke main body, 2a, 2b... Horizontal deflection coil, 11... Differential coil, 12... Diode.

Claims (1)

[Scope of utility model registration request] A deflection yoke characterized in that a differential coil is connected in series to a pair of horizontal deflection coils wound in a saddle shape, and a diode is connected in parallel between one end of the differential coil and approximately the midpoint. Device.