JPS6384287A - Deflector for color cathode-ray tube - Google Patents

Abstract

PURPOSE:To simplify the constitution of a correcting coil device and to miniaturize formation by fixing correcting cores, which constitute a correcting coil device, from outsides of small diameter parts of a conical core to positions near the horizontal axis. CONSTITUTION:Insertion parts 14 and l4' consisting of transmission holes or recessed parts are formed on a division face or small-diameter parts near the division face of a conical core 10 consisting of a ferrite, and one-side ends of correcting cores 15 and 15' are inserted to insertion parts 14 and 14'. Permanent magnets 16 and 16' to give a DC magnetic bias are set to the other ends of cores 15 and 15', and correcting coils 17 and l7' are wound around cores 15 and 15'. One end of the coil 17 is connected to one end of a coil 18 out of horizontal deflecting coils 18 and 18', and one end of the coil 17' is connected to one end of the coil 18'. The other end of the coil 17' is connected to not only the other end of the coil 18 but also a terminal 19, and one end of the coil 18' is connected to a terminal 20. Thus, cores 15 and 15' are provided to not only simplify the constitution of the device but also miniaturize formation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a deflection device for an in-line color cathode ray tube such as a color television receiver or a color one-terminal display.

(Prior Art) In a color television receiver using a conventional in-line color cathode ray tube.

In-line form factor 2 - The cathode ray tube uses a self-convergence method that does not require convergence adjustment.For this purpose, the horizontal deflection magnetic field of the deflection yoke is set to a strong pincushion magnetic field, and the vertical deflection magnetic field is set to a strong barrel magnetic field. Convergence 7 Lee. However, when the deflection angle of a color cathode ray tube exceeds 90°, effective convergence cannot always be achieved due to compensation for screen pincushion distortion.For this reason, improvements have been made to further improve convergence. As one method, a technique has been developed as shown in Japanese Unexamined Patent Publication No. 14453/1983.The technique described in this publication uses the magnetic flux emitted from the core of the deflection yoke. The circuit impedance of the horizontal deflection coil is changed by changing the circuit impedance of the horizontal deflection coil, and the current flowing through the horizontal deflection coil is differentially changed in the vertical deflection period.The phase of the horizontal deflection magnetic field distribution is changed over time to correct the convergence shift. In other words, the coil that constitutes the reactor is installed close to the core of the deflection yoke, and this coil is operated by obtaining a magnetic flux that changes with the vertical deflection period from the core of the deflection yoke, thereby achieving modulation in the vertical period. The convergence adjustment is performed by changing the circuit impedance of the horizontal deflection coil without providing a separate coil.

Although this conventional technology provides a significant improvement in convergence adjustment, the circuit configuration has become large. That is, four drum cores are attached to the outside of the small diameter portion of the conical core, a permanent magnet for direct current bias is attached to each drum core, and a modulation coil is connected in series with a horizontal deflection coil to this drum core. It must be constructed by winding it. Therefore, although electrically sufficient convergence correction can be expected, structurally it is necessary to arrange four drum cores around the outer periphery of the core, which complicates the configuration and increases the size. is what is left.

(Problems to be Solved by the Invention) As described above, in the conventional deflection device, a large number of drum cores are used, the structure becomes complicated, and the structure becomes large. An object of the present invention is to provide a deflection device for a color cathode ray tube which has a simple configuration and can improve convergence characteristics to the same extent without increasing the size of the configuration.

[Structure of the invention]

(Means for solving the problem) In the present invention, in order to modulate the horizontal deflection current with a vertical period,
By fixing the correction core constituting the correction coil device at a position close to the horizontal axis from outside the small diameter portion of the conical core, it is intended to produce the same effect as that of the conventional drum core.

(Function) This correction core is inserted into an insertion part consisting of a through hole or a recess formed near the dividing surface (including the dividing surface) of the conical core. The passing magnetic flux also passes through the correction core, so that correction bζ can be performed with a pair of correction cores, and it is possible to configure the device more compactly.

(Example) Examples of the deflection device for a color cathode ray tube according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a circuit configuration diagram showing a deflection device for a color cathode ray tube according to the present invention, in which a conical core (10) made of ferrite is provided, and this core (10) has two parts on the horizontal axis.
It is configured to be divided. Vertical deflection coils (11) (11') are wound toroidally around this core (10), and the ends of the respective coils (11) (11') are connected to each other to form a vertical deflection output circuit. (not shown) are connected to terminals (12) and (13). An insertion portion (14) (14') consisting of a through hole or a recess is formed on or near the dividing surface of the core (10) at a small diameter portion (on the electron gun side of the cathode ray tube).

This insertion part (14) (14') is also made of ferrite and has a cylindrical correction core (15) (ta').
) is inserted. This core (15) (1
A permanent magnet (16) (16') for applying a DC magnetic bias is attached to the other end of the core (15'), and a correction coil (17') is attached to the outer periphery of this core (15) (15').
) (17') is wound. One end of this correction coil (17) is connected to the horizontal deflection coil (18) (18'
) is connected to the negative end of the upper coil (18), and one end of the correction coil (17') is connected to one end of the lower coil (18'). The other end of the correction coil (17') is connected to the upper coil (
18) and is connected to a terminal (19) which is connected to the horizontal deflection output circuit (not shown).

One end of the lower coil (1B') is connected to a terminal (20) connected to the horizontal deflection output circuit. Although not clearly shown in this Figure 1, the horizontal deflection coil (1B)
(18') is formed in a hollow shape, and this horizontal deflection coil (1B) (1B') is connected to a core (10) around which vertical deflection coils (11) (11') are wound via spacers.
).

Next, to explain the operation of this deflection device, it is assumed that the direction of the vertical magnetic flux in the core (10) when deflecting the beam in the upward direction shown in FIG. 2 is the direction of -ψV in the figure. In the explanation of FIG. 2, the same parts as in FIG. 1 are denoted by the same reference numerals, and detailed explanation thereof will be omitted. So the vertical deflection coil (11)
(11') magnetic flux ψV, permanent magnet (16) (1
6') magnetic flux ψD.

Then, the magnetic flux obtained in the correction coil (17) is ψV+
ψDC, and the magnetic flux obtained in the other correction coil (17') becomes ψV-φD○. As a result, the correction coil (1
The inductance on the 7) side is small and the correction coil (17'
) side becomes larger and changes differentially.

Moreover, when deflecting downward, the operation is reversed. Therefore, the relationship between the vertical deflection current and the inductance of the correction coils (17) (17') is as shown in FIG. Therefore, the current flowing through the horizontal deflection coils (18) (18') to which the correction coils (17) (17') are connected is differentially changed in synchronization with the vertical period, and convergence correction is possible. It is possible.

As mentioned above, misconvergence can be corrected by this configuration. It can be formed from things.

In the above explanation, the insertion part is a through hole, and the correction core is also explained as being cylindrical.1For example, as shown in Figure 2, the inner diameter of the core is The insertion part may be formed as a through hole or recess with a conical shape; in this case, of course, it is necessary to set the shape of the core to match the insertion part. ,
The shape of the core may also be such that a flange is provided at one end and a permanent magnet is attached to the flange as shown in FIG. Furthermore, instead of this permanent magnet, a DC magnetic bias may be applied by winding a coil and passing a DC current.

Various other modifications and applications may be considered, but those that do not depart from the present invention are included within the scope of the present invention.

〔Effect of the invention〕

The present invention corrects misconvergence by differentially changing the impedance of the horizontal deflection coil in a vertical period [by changing the horizontal deflection magnetic field distribution over time, and the configuration of the correction coil device used for this purpose is It is possible to provide a deflection device for a color cathode ray tube that can be easily formed into a smaller size.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing a color cathode ray tube deflection device according to the present invention, FIG. 2 is a circuit configuration diagram of main parts for explaining its operation, and FIG. 3 is a characteristic diagram for explaining its operation. be. 10-...Conical core 11.11'...
...Vertical deflection coil 14, 14'...Insertion part
15; 115'...Correction core 16, 16'.
...Permanent magnet 17, 17'...Correction coil 18, 18'...Horizontal deflection coil Attorney Noriyuki Chika (one person) Figure 1 Foil figure 2

Claims (1)

[Claims] A two-part conical core in which a vertical deflection coil is wound in a toroidal shape, an insertion portion formed in contact with the dividing surface of the small diameter portion of this core from the outer side to the inner side; It is equipped with a correction core that is inserted into the insertion section and given a magnetic bias, and a correction coil that is wound around this core and inserted in series with the horizontal deflection coil, and converts the impedance of the horizontal deflection coil into vertical deflection. A color cathode ray tube deflection device characterized by differentially changing the period.