JPH0447651A - Color picture tube apparatus - Google Patents

Abstract

PURPOSE:To get rid of cross miss-convergence in the image middle part by dividing a horizontally deflecting coil into a plurality of divided horizontal- deflecting coil connected in series and putting a saturable reactor in the opposite to each of a plurality of divided horizontally deflecting coils. CONSTITUTION:When vertical deflection current is applied to each auxiliary coil 40, 43 in the vertical side of a first and a second saturable reactors 22-1, 22-2 by operation of a deflecting yoke 21, magnetic fluxes which change in vertical deflection cycle are generated. The sized of circuit impedance of the upper part coil 33a and the lower part coil 33b of the first divided horizontally deflecting coil 32-1 are changed differentially and the sizes of circuit impedance of the upper part coil 34a and the lower part coil 34b of the second divided horizontally deflecting coil 32-2 are changed differentially, so that difference is caused in electric current running in the upper coils 33a, 34a, and the lower coils 33b, 34b. Consepuently, the intensity of the generated magnetic field is adjusted in each saturable reactor 22-1, 22-2, and thus cross miss-convergence in image middle part is properly corrected.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a color picture tube device, and in particular to an in-line color picture tube device by changing the circuit impedance of a horizontal deflection coil with a vertical deflection period. The present invention relates to a color picture tube device that corrects a convergence error between a pair of side beams of a picture tube.

(Prior Art) In general, a color picture tube deflects three electron beams emitted from an electron gun using horizontal and vertical deflection magnetic fields generated by a deflection yoke attached to the outside of an envelope, and has many electron beam passing holes. A color image is displayed on the phosphor screen by horizontally and vertically scanning the phosphor screen through a shadow mask formed with the phosphor screen.

In particular, for in-line collar receiving and storage systems that emit three electron beams arranged in a row, consisting of a center beam and a pair of Zide beams, which pass on the same horizontal plane from an electron gun, the horizontal deflection magnetic field is binction type and the vertical deflection magnetic field is barrel type. By creating a uniform magnetic field, simply by combining this deflection yoke with a color picture tube, the three electron beams arranged in rows can be self-focused and spread over virtually the entire screen without using any external circuit correction means. A self-convergence method has been realized to match the

One of the deflection yokes of such an in-line color picture tube
As an example, as shown in Figure 3, a ferrite core (1)
A so-called semi-toroidal type has a pair of upper and lower saddle-shaped horizontal deflection coils (2) arranged inside the core, and a pair of upper and lower toroidal vertical deflection coils (3) wound directly around the core (1) on the outside. There is a deflection yoke.

By the way, regarding this self-convergence type in-line color picture tube, even if the winding distribution of the horizontal and vertical deflection coils is adjusted so that the three electron beams are concentrated on the top, bottom, left and right sides of the screen, and the magnetic field distribution is changed, It is difficult to concentrate the three electron beams on a part of the screen corner, and the fourth
As shown in the figure, cross misconvergence occurs between the convergence patterns (5B) and (5R) of the pair of side beams. The convergence error between the convergence patterns (5B) and (5R) of the pair of side beams is called a trilemma Tr, and is expressed by the following formula by adjusting the three convergence error elements Xh, Yl(, PQV) shown in the drawing.

Tr = Xh - Yl (+PQV) The symbol in this equation assumes that the electron gun array emits blue, green, and red electron beams from the left when viewed from the screen side, and represents the convergence pattern (5B) shown in the figure.

A case where (5R) deviates as shown is considered positive.

In ordinary color picture tubes, the three elements of convergence error, Xh, Yl(, and PQV), are combined and put into practical use. When it comes to pipes, the errors can no longer be ignored.

One way to solve this problem is to use horizontal and vertical deflection coils to make XhSYl (zero), and to correct PQV using a saturable reactor that changes the horizontal deflection magnetic field with the vertical deflection period.

FIG. 5 shows the conventional saturable reactor. This saturable reactor consists of a pair of parallelly arranged cores arranged in series, and two sets of four saturable cores (8a), (8b) each magnetically biased by permanent magnets 7) arranged at both ends.
) , (8c) , (8d) and their respective sets of saturable cores (8a) , (8b) and (8c) , (8
d) horizontal side auxiliary coils (9a) respectively wound on
, (9b) and (9c), (9d) and four saturable cores (8a), (8b).

It consists of (8c) and (8d) a vertical auxiliary coil (10) wound entirely. Then, as shown in Figure 6,
One of the horizontal auxiliary coils (9a) and (9b) is connected to one of the pair of horizontal deflection coils (2) above and below the deflection yoke, for example, the upper horizontal deflection coil (12a), and the other horizontal auxiliary coil (9c) , (9d) is the other horizontal deflection coil (2), that is, the lower horizontal deflection coil (12b)
connected in series. In addition, the vertical side auxiliary coil (10
) are connected in series with the vertical deflection coil (3).

The vertical deflection current flowing through the vertical auxiliary coil (10) generates a magnetic flux that changes with the vertical deflection period, and this magnetic flux causes the horizontal auxiliary coil (9a) to move as shown by the curve (L3a) in FIG. , (9b) tend to be saturated, the horizontal auxiliary coils (9c), (9d) tend to be unsaturated, as shown by the curve (L3b) in the figure, and conversely, the horizontal auxiliary coils (9a) tend to be unsaturated. ), <9b) tend to be unsaturated, the horizontal auxiliary coils (9c), (9
d) has a saturated tendency, and the saturated/unsaturated tendency is repeated in the vertical deflection period, and the upper horizontal deflection coil (1, 2a)
The magnitude of the circuit impedance of and the lower horizontal deflection coil (
+2b) The magnitude of the circuit impedance is changed differentially. As a result, the amplitude of the current flowing through the upper horizontal deflection coil (12a) and the amplitude of the current flowing through the lower horizontal deflection coil (1, 2b) are modulated by the vertical deflection period, so that when the upper side tends to barrel, the lower side The cross misconvergence is corrected by generating a magnetic field distribution in which the upper side tends to bink, and conversely, when the upper side tends to bink, the lower side tends to barrel.

However, even if the cross-misconvergence is corrected using the saturable reactor as described above, the convergence error shown in FIG. 8 remains in relatively large color display tubes, such as the 20-inch class. That is, if a negative PQV remains between the convergence patterns of a pair of side beams when not corrected by a saturable reactor, 1. (The convergence pattern in Figure 4 is positive.) When this is corrected using a saturable reactor, the correction by the saturable reactor becomes almost linear with respect to the distance d1 from the horizontal axis, that is, the absolute value of the vertical deflection current. 32 in Figure 3
．． Corresponding to S 3, the curves (14), (1,,5)
As shown in , the cross misconvergence in the middle part is overcorrected.

(Problem to be Solved by the Invention) As mentioned above, the self-convergence type in-line color picture tube originally focuses the three electron beams over the entire screen, but in reality, it horizontally so that the three electron beams are concentrated at the
Even if the winding distribution of the vertical deflection coil is adjusted to change the magnetic field distribution, it is difficult to concentrate the three electron beams at a part of the screen corner, and cross misconvergence occurs between the convergence patterns of a pair of side beams. .

In order to eliminate this convergence error, the three elements
h, YH5PQV, Xh and YH are set to zero by the horizontal and vertical deflection coils of the deflection yoke, and PQV is corrected using a saturable reactor that changes the horizontal deflection magnetic field with the vertical deflection period.

However, even if this saturable reactor is used, in high-resolution tubes such as large consumer color picture tubes and color display tubes, the correction by the saturable reactor is almost linear with respect to the absolute value of the vertical deflection current. In particular, there is a problem in that the cross misconvergence in the intermediate region is overcorrected.

This invention has been made to solve the above problems, and aims to eliminate cross misconvergence in the middle of the screen and to configure a color picture tube device that has good convergence characteristics over the entire screen. .

[Structure of the Invention] (Means for Solving the Problem) A deflection yoke having horizontal and vertical deflection coils for deflecting the plurality of beams in horizontal and vertical directions is attached to a color picture tube that emits a plurality of beams arranged in a row. , has a horizontal auxiliary coil connected in series with the horizontal deflection coil and wound around a magnetically biased saturable core, and a vertical auxiliary coil connected in series with the vertical deflection coil and wound around the saturable core. , a saturable reactor that modulates the horizontal deflection current flowing through the horizontal deflection coil with the vertical deflection current flowing through the vertical deflection coil, the horizontal deflection coil being connected in series to form a plurality of divided horizontal deflectors. The structure is such that the coil is divided into coils, and the above-mentioned saturable reactor is provided opposite to each of the plurality of divided horizontal deflection coils.

(Function) As described above, if the horizontal deflection coil of the deflection yoke is divided into a plurality of divided horizontal deflection coils, and a saturable reactor is provided opposite each of the divided horizontal deflection coils, the impedance of each saturable reactor can be differentiated. By dynamically modulating the magnitude of the deflection current flowing through each divided horizontal deflection coil, the horizontal deflection magnetic field obtained from all of them is made vertically asymmetric, and the strength of the magnetic field is adjusted to each individual saturable reactor. This can be adjusted by increasing or decreasing the number of turns of the vertical auxiliary coil connected in series with the vertical deflection coil, thereby making it possible to correct cross misconvergence in the middle of the screen.

(Example) Hereinafter, the present invention will be described based on an example with reference to the drawings.

FIG. 2 shows a color picture tube device which is one embodiment of the present invention.

This color picture tube device includes a color picture tube (20) and a deflection yoke (21) attached to the color picture tube (20).
) and a saturable reactor (22) attached to this deflection yoke (21).

The color picture tube (20) has a three-color phosphor layer that emits blue, green, and red light on the inner surface of the panel (24) of the envelope, which is composed of a panel (24) and a funnel (25) that are joined together. Opposing and close to this phosphor screen (26), a shadow mask (26) having a large number of electron beam passage holes formed inside the phosphor screen (26) is formed.
27) is installed. Also, in the neck (28) of the funnel (25), a center beam (29G) and a pair of Zide beams (29B) passing on the same horizontal plane,
An electron gun (30) is provided which emits three electron beams arranged in a row of (29R).

The three electron beams emitted from the electron gun (30) are deflected by the horizontal and vertical deflection magnetic fields generated by the deflection yoke (21) described below, and pass through the electron beam passage hole of the shadow mask (27) to the phosphor screen ( By horizontally and vertically scanning the phosphor screen (26),
It is formed into a structure that displays a color image on top.

The deflection yoke (21) is connected to the color picture tube (20).
A pair of upper and lower saddle type horizontal deflection coils are attached to the outside of the envelope and placed inside the mold, and a pair of upper and lower toroidal type vertical deflection coils are wound around a ferrite core and placed outside the mold. It has a coil. The horizontal and vertical deflection coils are respectively
Generate horizontal and vertical deflection magnetic fields that deflect the electron beam horizontally and vertically.

In particular, the deflection device (2]) of the color picture tube device in this example is
As shown in FIG. 1, the horizontal deflection coil is divided into two divided horizontal deflection coils (32-1) and (32-2). Then, each divided horizontal deflection coil (3
2-1), upper coil (33a) of (32-2)
, (34a) is connected to the lower coil (33b) via the upper horizontal auxiliary coil of the saturable reactor (22) below.
, (34b) are connected in series via the lower horizontal auxiliary coil.

The saturable reactor (22) is arranged opposite to each divided horizontal deflection coil (32-1), (32-2) of the deflection yoke (21), as shown surrounded by broken lines in the figure. The first and second saturable reactors (22-1,), (2
2-2).

The first saturable reactor (22-1,) has a pair of parallel cores arranged in series, and permanent magnets (3
6) and magnetically biased two sets of four saturable cores (37a) to (37d), and one set of the two sets of four saturable cores (37a) to (37d). a two-part horizontal auxiliary coil (38a) wound around the saturable core (37a), (37b) and connected in series to the upper coil (33a) of the split horizontal deflection coil (32-1), and the other set. The lower horizontal auxiliary coil (3) is wound around the saturable cores (37c) and (37d) of
8b) and two sets of four saturable cores (37a) to (37d
) and a vertical auxiliary coil (40) wound around the entire vertical deflection coil (39) and connected in series to the vertical deflection coil (39).

Moreover, the second saturable reactor (22-2) is formed in the same structure as the first saturable reactor (22-1), and has a pair of cores arranged in parallel, and a permanent magnet at both ends. (36) is arranged and magnetically biased into two sets of four saturable cores (41a) to (41d), and the other set of saturable cores (4La) and (41b) are wound and divided. An upper horizontal auxiliary coil (42a) connected in series to the upper coil (34a) of the horizontal deflection coil (32-2), and the other set of saturable cores (41,c), (4Ld
) and connected in series to the lower coil (34b) of the divided horizontal deflection coil (32-2), and two sets of four saturable cores (41a) to (
41d) and a vertical auxiliary coil (43) wound around the entire vertical deflection coil (39) and connected in series to the vertical deflection coil (39).

By the way, in the color picture tube device configured as described above, the deflection yoke (21) is operated to
When a vertical deflection current is passed through the vertical auxiliary coils (40), (43) of the saturable reactors (22-1,), (22-2), the vertical auxiliary coils (40), (43) of the saturable reactors (22-1,), (22-2)
43), a magnetic flux that changes with the vertical deflection period is generated. This magnetic flux causes the first divided horizontal deflection coil (32-1
) differentially changes the circuit impedance of the upper coil (33a) and the lower coil (33b) of the upper coil (34a) of the second divided horizontal deflection coil (32-2). Differentially changing the circuit impedance of the lower coil (34b) and the circuit impedance of the lower coil (34b), thereby
The upper coils (33a) and (34a) of each divided horizontal deflection coil (32-1) and (32-2) and the lower coil (3
3b).

(34b) allows the horizontal deflection magnetic fields generated in the first and second divided horizontal deflection coils (32-1) and (32-2) to be vertically asymmetrical. Furthermore, by changing the number of turns of the vertical auxiliary coils (40) and (43), the strength of the magnetic field generated can be adjusted by changing the number of turns of the vertical auxiliary coils (40) and (43).
22-]) and (22-2), it is possible to appropriately correct the cross misconvergence in the middle part of the screen shown in FIG. In other words, by using the two saturable reactors (22-1) and (22-2), the two-lower asymmetry of the horizontal deflection magnetic field can be adjusted in a well-balanced manner at the periphery and middle of the screen.
It becomes possible to perform optimal correction.

Although the horizontal deflection coil is divided into two parts in the embodiment described in "-," the horizontal deflection coil may be divided into two or more parts, and a saturable reactor may be provided oppositely to each part.

Further, in the above embodiments, a semi-l-loidal type deflection yoke has been described, but the present invention can also be applied to a zaddle-to-saddle type deflection yoke in which both the horizontal and vertical deflection coils are saddle-type.

[Effects of the invention] 5. The horizontal deflection coil of the deflection yoke attached to a color picture tube that emits a plurality of beams arranged in a row is divided into a plurality of divided horizontal deflection coils, and each of the divided horizontal deflection coils has a saturable When the reactors are installed in parallel, the impedance of each saturable reactor is modulated differentially, thereby creating a difference in the magnitude of the deflection current flowing through each divided horizontal deflection coil, and making the horizontal deflection magnetic field generated from all of them vertically asymmetric. By adjusting the strength of the magnetic field for each saturable reactor by increasing or decreasing the number of turns of the vertical auxiliary coil connected in series with the vertical deflection coil, cross misconvergence in the middle of the screen can be corrected. , it is possible to construct a color picture tube device having good convergence characteristics over the entire screen.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing the configuration of a deflection yoke and a saturable reactor of a color picture tube according to an embodiment of the present invention;
3 is a diagram showing the configuration of the color picture tube device, FIGS. 3 to 8 are explanatory diagrams of the conventional color picture tube device, FIG. 3 is a perspective view showing the configuration of a semi-toroidal type deflection device, and FIG. The figure shows the Talosmith convergence between the convergence patterns of a pair of side beams, Figure 5 shows the configuration of the iJ saturation reactor, and Figure 6 shows the deflection device and the "iJ
FIG. 7 is a circuit diagram showing the configuration of the saturable reactor, FIG. 7 is a diagram showing changes in magnetic flux in the saturable reactor, and FIG. 8 is an explanatory diagram of cross misconvergence that occurs after correction by the saturable reactor. 20... Color picture tube, 21... Deflection yoke, 2
2... Saturable reactor, 29B, 29R... Pair of side beams, 29G ・
- Center beam, 30... Electron gun, 32-1.32-2... Divided horizontal deflection coil, 33a
... Upper coil, 33b... Lower coil, 34a...
・Upper coil, 34b...Lower coil, 36...
Permanent magnet, 37a to 37d... Saturable core, 38a... Upper horizontal auxiliary coil, 38b... Lower horizontal auxiliary coil, ] 7 39... Vertical deflection coil, 40... Vertical auxiliary coil , 41a to 4Ld... Saturable core, 42a... Upper horizontal auxiliary coil, 42b... Lower horizontal auxiliary coil, 43... Vertical auxiliary coil,

Claims (1)

[Scope of Claims] A color picture tube that emits a plurality of beams arranged in a row, and a horizontal deflection coil that is attached to the color picture tube and that deflects the plurality of beams in a horizontal direction and a vertical deflection coil that deflects the plurality of beams in a vertical direction. a deflection yoke, a magnetically biased saturable core, a horizontal auxiliary coil connected in series to the horizontal deflection coil and wound around the saturable core, and a horizontal auxiliary coil connected in series to the vertical deflection coil and wound around the saturable core. In the color picture tube device, the color picture tube device includes a vertical auxiliary coil, and a saturable reactor that modulates a horizontal deflection current flowing through the horizontal deflection coil by a vertical deflection current flowing through the vertical auxiliary coil, wherein the horizontal deflection coil is connected in series. 1. A color picture tube device, characterized in that it is divided into a plurality of connected divided horizontal deflection coils, and each of the divided horizontal deflection coils is provided with the above-mentioned saturable reactor.