JPH02244539A - Chromatic observation adjusting device for color cathode-ray tube - Google Patents

Abstract

PURPOSE:To provide possibility for an unskillful operator to make band pattern adjustment precisely in a short time by determining the amounts of motion of the measuring pattern for each color at its center and two ends of the panel front face, determining the factor for each adjusting magnet from these amounts of motion, and controlling magnet operating means according to the factors obtained. CONSTITUTION:The amounts of motion in the center and two ends of a dot pattern for measurement due to differential movement of adjusting magnet 3, 4 are determined from the image of the dot pattern for measurement photographed by ITV cameras 10, 11, 12, which are installed in the center and at two ends of the panel front face of this color CRT concerned 1. From these amounts of motion, operations of the adjusting magnets 3, 4 are controlled through determination of factors Ka, Kb for them. This generates automatic determination of the factors Ka, Kb, which ensures that adjustment of baud pattern due to differential movement of these magnets 3, 4 with each other is made certainly in a short time.

Description

Detailed Description of the Invention [Purpose of the Invention (Industrial Application Field) The present invention is directed to a method for adjusting the so-called beau baton, in which the amount of color misregistration increases from the center of the color cathode ray tube toward both ends. Relating to an adjustment device.

(Conventional technology) To adjust the image of a color CRT, use the board. (bow) There is something called a slam adjustment.

Here, the occurrence of this beau baton will be explained.

When a measurement dot pattern as shown in Figure 6 is displayed on a color cathode ray tube, if normal, each of the R (red) and B (blue) electron beams is Irradiates accurately to the same location. However, when a bombardment occurs, the irradiation position of the electron beam shifts in the vertical direction for both R9B as shown in FIG. In the same figure, R
It shows the beau baton generation in the oB electron beam, and R
The iJ'f Bohm of 1B is slightly shifted upward with respect to the phosphor dots at the center of the color cathode ray tube 1, and is greatly shifted upward at both ends. In other words, R
, H in the vertical direction is largely shifted from the center of the color cathode ray tube 1 toward both ends. When this amount of deviation is continuously shown, it becomes curved as shown in FIG.

By the way, such beau baton adjustment is performed as follows. That is, as shown in FIG. 9, two sets of adjustment magnets 3 and 4 are provided on the neck portion 2 of the color cathode ray tube 1, and the beau baton is adjusted by operating these adjustment magnets 3 and 4. Here, each of the adjustment magnets 3 and 4 consists of a pair of ring-shaped magnets 3a, 3b, and 4a, 4b each magnetized into four poles. In the initial state, the positional relationship between the magnetic poles N and S is the first O.
As shown in the figure, a north pole and a south pole are arranged every 906, and if one magnet, for example 3a, is an south pole, the other magnet 3b is arranged with a north pole. In addition, in FIG. 10, the other magnet 3b
For illustration purposes, the magnetic poles are not shown in parentheses and are 2. These magnets 3a and 3h are configured to rotate in the directions of arrows (a) and (b), respectively. Note that the R shown in the figure together with the magnet 3a
, G, and B each indicate the arrangement state of the electronic mirrors of each color L7.

On the other hand, the adjustment magnet 4 has the same structure as the adjustment magnet '.

To explain the function of each of the adjusting magnets 3 and 4 configured in this way, in the initial state, that is, the state in which the magnetic poles N and S overlap each other as shown in FIG. 10, the magnetic flux becomes zero, and the electron beam There is no effect of magnetic field on. Therefore, as shown in FIG. 11, for example, the magnet 3a is rotated in the direction of arrow (B) and the magnet 3b is rotated in the direction of arrow (A) (hereinafter, this operation is referred to as differential). When SS and SS are superimposed on each other, magnetic fields H1°H2, H move from magnetic pole N to magnetic pole S as shown in FIG.
3, H4 occurs. As a result, the combined magnetic field Ha of the respective magnetic fields H1 and H2 acts on the electric r beam of R, and the electric f beam of C' R moves in the direction of the arrow (c) in response to this combined magnetic field Ha. Similarly, each magnetic field H is applied to the electron beam B.
A composite magnetic field Hb of 3 and H4 acts, and the electron beam of B moves in the direction of arrow (d) in response to this composite magnetic field Hb. On the other hand, as shown in FIG.
When the same polarity NN and SS are overlapped with each other by differentially moving the magnet 3b in the direction of the arrow (b), magnetic fields H5, H6, 8? as shown in FIG. 14 are generated. , H8 occurs. As a result, the electron beam of R is exposed to each magnetic field 11.5. The composite magnetic field of He acts to move in the direction of the arrow (bo), and
The electron beam B moves in the direction of the arrow (toward) due to the action of the composite magnetic field Hd.

It should be noted that the same effect is achieved for the adjustment magnet 4 as well.

Incidentally, the amount of movement of each electron beam due to the differential movement of these adjustment magnets 3.4 is smaller at both ends of the color cathode ray tube 1 than at the center, as shown in FIG. In other words, the amount of movement of the electron beam of R is ver.
and V "" at both ends.

vl'', and the amount of movement of the electron beam at B is v at the center.
Cl) and v'b, vlb at both ends, (vtr +vlb +vrb +vrr,) /
The relationship is the amount of movement: 2<ver +veb. Further, if the ratio of the amount of movement of the electrician beam at the center portion by each adjusting magnet 34 to the amount of movement at both ends is defined as coefficients Ka and Kh, the relationship Ka>Kb holds true.

However, the adjustment of the beau baton is carried out by an operator differentially moving each adjustment magnet 3.4 using the above relationship. First, the adjusting magnet 3 is moved differentially to zero the vertical deviation of each of the R and B electron beams at the center of the screen. At this time, R, B at both ends of the screen
The vertical deviation of each electron beam is assumed to be 1''. Next, move the adjustment magnet 4 differentially to R1°B in the direction of the curved convex part of the beau baton and to the position where the vertical deviation of each R and B electron beam at the center of the screen is about 10 times the measured value. Separate each electron beam from each other. Thereafter, the adjusting magnet 3 is moved differentially again to superimpose the R and B electron beams, which are shifted in the vertical direction, at the center of the screen. With the above operations, the adjustment of Beaubatin is completed.

However, since the above-mentioned adjustment is performed visually by the operator, there are variations in the adjustment accuracy (1) and there are also variations in the adjustment results depending on the operator. Moreover, it takes time to adjust, especially for inexperienced users.

(Problems to be Solved by the Invention) As described above, when adjusting the beau baton, the adjustment accuracy varies and the adjustment takes time.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a color shift adjustment device for a color cathode ray tube that allows even an unskilled person to perform Beauvatin adjustment, which is one of the color shifts in a color cathode ray tube, with high precision and in a short time.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides imaging devices disposed at the center and both ends in the horizontal direction of the front panel of a color cathode ray tube;
A pattern display means for displaying measurement dot patterns of each color on a color cathode ray tube, two sets of adjustment magnets each consisting of a pair of ring-shaped quadrupole magnets provided in the neck of the color cathode ray tube, and these adjustment magnets. From the images of the measurement dot patterns captured by the magnet operation means operated by each image carrier, the amount of movement of each color measurement pattern in the center and both ends of the front panel of the panel due to the operation of each adjustment magnet is determined. A color shift adjustment device for a color cathode ray tube which achieves the above object by comprising: a first stage of adjustment for determining coefficients for each adjustment magnet from these moving amounts and controlling the operation of the magnet operating means according to the coefficients; It is.

(Function) With the provision of such a means, the adjustment means can calculate the measurement dot pattern from the images of the measurement dot patterns taken by the respective imaging devices arranged at the center and both ends of the front panel of the color cathode ray tube. Measurement dot pattern of each color due to the operation of each adjustment magnet provided on the neck. Obtain the amount of movement in the center and both ends of the front panel, and calculate each coefficient for each adjustment magnet from these amounts of movement. The operation of the magnet operating means is controlled according to the coefficient. Then, by this operation control, the electron beams of each color are moved to adjust the color shift.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same parts as in FIG. 10 are given the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 1 is a block diagram of a color shift adjustment device for a color cathode ray tube. There are three IT units in front of the color cathode ray tube 1 panel.
V (industrial television) cameras 10, 11.12 are arranged. These ITV cameras 1.0. 1. ]
,, 1.2 is arranged as shown in FIG. 2, and the ITV camera 10 is placed in the center of the front panel, and the ITV camera 1.1. ．． 12 is placed on a horizontal line passing through the placement positions of the ITV cameras 10 at both ends of the front surface of the panel. These ■1"V cameras 11°12 are arranged at intervals f from the central ITV camera 10.These ITV cameras 10°11.
The ITV cameras 10, 11, . Each image signal output from 12 is sent to image processing device 5 through camera controller 13 and camera switching section 14. The camera switching unit 14 sends a switching signal to the camera controller 13 to perform 1. TV right camera 0.11
, 1.2, one of the ITV cameras is operated to take an image.

Further, a television controller 16 is connected to the color cathode ray tube 1, and this television controller 16 has a total of 11 units connected to the color cathode ray tube 1 as shown in FIG.
R and G dot patterns for FI.

It has a function of displaying each color of B.

On the other hand, 17 is a magnet operating means, which is a mechanism for differentially moving the adjustment magnets 3 and 4.

Specifically, three motors 18°19.20 are provided,
Of these, the adjusting magnet 3 is differentially driven by the motor 18, and the adjusting magnet 4 is differentially driven by the motors 19 and 20. In addition, each motor 1
8°1.9.20 and each adjusting magnet 3.4 are connected by gears. And each motor 18°192
0 are each driven and controlled by a motor controller 21.

The image processing unit 15 is connected to each ITV camera 10°11.12.
Each image signal is digitally converted and stored as image data, and from this image data, the content instructed by the main control unit 22, for example, the position of each color electron beam when the adjustment magnets 3 and 4 are moved differentially. It has the function of determining the following.

The main control section 22 controls the image processing section 15 in accordance with the adjustment flowchart shown in FIG. Camera switching unit 14, motor controller 21
and the television controller 16 to control the adjustment operation, that is, each ITV camera 10,
1. From the image of the measurement dot pattern taken in 1.12, determine the amount of movement of the measurement dot pattern of each color in the center and both ends of the panel front due to the operation of each adjustment magnet 3 and 4, and calculate these movements. Coefficients Ka and Kb for each of the adjusting magnets 3 and 4 are determined from the quantities, and an operation command is sent to the motor controller 2 according to these coefficients Ka and Kb.

Next, the operation of the apparatus constructed as described above will be explained according to the adjustment flowchart shown in FIG. Here, due to the differential movement of the adjustment magnets 3 and 4, the amount of movement of the electron beam is smaller at both ends than at the center of the front panel of the color cathode ray tube 1, and each adjustment magnet 3 and 4
The coefficients Ka and Kb have a relationship of Ka>Kh.

■ Calculating the coefficient Kb of the adjustment magnet 4 First, the main control unit 22 controls the television controller 16 with R,
A pattern generation command for each color of B is issued. As a result, the color cathode ray tube 1 displays dot patterns as shown in FIG. In order to set the initial state to zero, the main control unit 22 issues an initial state command to the motor controller 21.As a result, each motor 1.8, 1.9.20 is driven, and each adjustment magnet 3, 4 is set to the initial state. In this state, R,
Electron beams of each color G and B are connected to adjustment magnets 3 and 4.
The phosphor is irradiated without being affected by the magnetic field from the phosphor. Therefore, in step s1, each ITV camera 10, 11, 12 images each dot of the measurement dot pattern within the imaging area and outputs the image signal. These image signals are sent from the camera controller 13 to the image processing section 15 via the camera switching section 14.

This image processing unit] 5 digitally converts each image signal and stores it as each image data. Here, as shown in FIG. 4, the positions of the measurement dots for each color of RlB are rye, ryr, r in the order of center, right end, and left end in the drawing.
yL and hye, byr, and byl at SB, the ITV camera 10 images rye and bye, the ITV camera 11 images ryr and hyr, and the ITV camera 12 images ryf and byl. However, the image processing unit 15 calculates rye, ryr, ryl of R and bye of B from the pixel position of each stored image data.

Detect the positions of byr and byl. Next, main control section 2
2 is R rye , ryr , R in step S2.
Calculate the following formula from each position of bye, byr, and M+ of ryf and B to calculate the deviation ff1vlseo,
Calculate veseO and vrscO.

That is, vlseo -ryl -byl vcseO-rye -bye v"seO-ryr -byr
=11).

Next, proceeding to step s3, the main control section 22 issues a command to the motor controller 21 to differentially move the adjustment magnet 4 by a predetermined angle θb. As a result, the adjustment magnet 4 differentially generates a magnetic field, and upon receiving this magnetic field, R, B
Each electron beam of moves. In this state, in step s4, each ITV camera 10, 11, 12 takes an image and outputs the image signal, and these image signals are sent to the image processing section 15. This image processing unit 15 calculates the position r of the electron beam of each color of R and B from each image data as described above.
yC, r)'r, ryl and hye, byr
, detect byl. Although the position of each electron beam has moved, the same reference numerals are used for convenience. Next, in step s5, the main control unit 22 shifts 1 from these positions.
Calculate ivlsel, vesef, and vrsel. That is, vlscl -ryl -byl vesel -rye -bye vrsel -ryr -byr
-(2).

Next, proceeding to step s8, the main control unit 22 calculates each of the deviations mvlseO, veseo, vrseo, and vlsel obtained above.

The coefficient Kb of the adjustment magnet 4 is determined by calculating the following formula from vesel and vrsel. That is, first, the amounts of change vlse, vese, and v+rse are determined.

vlsc-vlsel, -vlscOvcse-v
escl -veseOvrse-vrsel -
vrscO=13) The coefficient Kl) is determined from the result of the following equation (3).

Kl) - (vlse+vrse) / 2 conflict ves
e = 14) ■ Calculating the amount of beautification generated When the coefficient Kb of the adjustment magnet 4 is determined as described above, the main control section 22 issues a command to return the adjustment magnet 4 to its initial state in step s7. Then, in order to obtain the original amount of beautification generated, the main control unit 22 issues a command to the motor controller 21 to differentially move the adjustment magnet 4 again, and adjusts the R and B electron beams in the center of the color cathode ray tube 1 up and down. Make sure there is no color shift in the direction. At this time, the image processing section 15 receives an image signal from the ITV camera 10, and the determination of color shift is performed from the detection position of the R and B electron beams of this image data. In this way, when the R and B color shift in the central portion becomes almost zero due to the differential movement of the adjustment magnet 4, each ITV camera 10 is brought into this state in step s9.
, 11 and 12 respectively perform imaging and output image signals. The image processing unit 15 then processes R, H from each image data.
The positions of each electron beam rye , ryr , ryl
and bye, byr.

Detect byl. Then, in step slO, the following formula is calculated from these positions to obtain the bow baton generation amount bow.
Calculate. That is, vl-ryl -byl ve -rye -bye vr -ryr -byr -
(5) Therefore, bov= (vl+ vr -2ve), / 2
-(6).

Next, in step sll, the main control unit 22 compares the occurrence of a beau bang ff1bov with a preset determination value,
If the bow button occurrence ff1bov is within the determination value, there is no color shift, and the adjustment is completed in step s12. However, if the bow baton generation amount bow is outside the judgment value,
The main control unit 22 moves to step s1.3 and calculates the coefficient Ka of the adjustment magnet 3.

(1) Calculating the coefficient Ka of the adjustment magnet 3 In step s13, the main control section 22 issues a command to the motor controller 21 to differentially move the adjustment magnet 3 by a predetermined angle θa. As a result, the adjusting magnet 3 differentially moves to generate a magnetic field, and each of the R and B electron beams moves in response to this magnetic field.

In this state, in step s14, each ITV camera 10
．． 11 and 12 respectively perform imaging and output the image signals, and these image signals are sent to the image processing section 15. This image processing unit 15 processes R, B from each image data in the same way as above.
The positions of the electron beams of each color rye , ryr , r
Detect yl and hye, byr, byl.

Note that, also here, the same reference numerals are used for the positions of each electron beam for convenience. Next, in step s15, the main control unit 22 shifts from these positions mvln, vCn,
Calculate vrn. That is, vln −ryl −
1) Y! ven - "ye -bye vrn -ryr -byr -
(7). Then, in the 31st step slO, the main control unit 22 adjusts these deviations jitvln, ven,
The coefficient Ka of the adjustment magnet 3 is calculated from vrn. That is, Ka −((vln +v′n) −(vl+vr)
)+2(ven-ve)...
(8).

■ Beauvatin adjustment When the coefficient Ka of the adjustment magnet 3 is obtained in the above manner, the main control section 22 adjusts the color cathode ray tube 1 by the differential movement of the adjustment magnet 3 in step s1.7.
A command is issued to the motor controller 21 to vertically separate the positions of the R and B electron beams at the center of the motor. At this time, the distance by which each electron beam is separated can be determined as follows. In other words, the release Iik ta is ta - how / (Kb - K・a)
=-(9). Then, the differential ff1aj of the adjustment magnet 3 is made to differ by the angle θa when calculating the coefficient Ka of the adjustment magnet 3, so aj −θa t a / (yen −v
e) -θa... (10) When the differential amount aj of the adjusting magnet 3 is determined in this way, the main control unit 22 causes the motor controller 21 to differentially move the adjusting magnet 3 in step s18;
Issue a command to make a differential at aj. As a result, the adjustment magnet 3 moves differentially, and each of the R and B electron beams moves in accordance with the magnetic field generated by this differential movement. After that, the main control unit 22 issues a command to the motor controller 21 to set the adjustment magnet 4 to the initial state, and in the next step s20, each T of R and B at the center of the color cathode ray tube 1 is
A command for differential adjustment of the adjustment magnet 4 is issued to the motor controller 21 so that the deviation of the if beam is zero.

At this time, the image processing section 15 receives an image signal from the ITV camera 10 and detects the amount of deviation from the detection positions of the R and B electron beams on this image data.

Then, the main control section 22 issues a command to the motor controller 21 so that this amount of deviation becomes zero. In this way, when the deviation of each of the R and B electron beams becomes zero, the adjustment of the beau baton is completed. As a result, each of the R and B electron beams is accurately irradiated onto each phosphor dot without shifting from the center to both ends of the color cathode ray tube 1, as shown in FIG.

In this way, in the above-mentioned embodiment, each adjustment magnet is determined from the image of the measurement dot pattern taken by each of the ITV cameras 10, 11 and 12 arranged at the center and both ends of the front panel of the color cathode ray tube 1, respectively. The amount of movement at the center and both ends of the measurement dot pattern due to the differential motion of 3 and 4 is determined, and from these amounts of movement, the coefficients Ka and Kb for each yA adjustment magnet 3 and 4 are determined. , 4 are controlled, so
Each coefficient Ka of each adjustment magnet 3.4.

Kb is automatically determined and these adjustment magnets 3.4
Adjustment of the beau baton can be performed reliably in a short time by mutual differential movement of the two. In this bow batten adjustment, it is possible to accurately measure the amount of deviation of each color in each dot when the 11-degree measuring dot pattern is displayed, and there is no possibility of erroneous measurement as would be the case with visual measurement. Therefore, the adjustment of the beau baton can be made with high precision without any variation.1. It can be done in a short amount of time.

Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without departing from the spirit thereof. The coefficient Kb of the adjustment magnet 4 is determined by adjusting the R at the center of the color cathode ray tube 1 by differentially moving the magnet 4 in step s8.
, B before and after adjusting the deviation of each electron beam to zero.
The amount of deviation of each electron beam at the center and both ends of the color cathode ray tube 1 may be detected and determined from each image data obtained by imaging with the TV camera 10°11.12.

[Effects of the Invention] As described in detail above, the present invention provides a color shift adjustment device for color CRTs that can perform beau baton adjustment, which is one of the color shifts in color CRTs, with high precision and in a short time even in an inexperienced person. can.

[Brief explanation of drawings]

1 to 5 are diagrams for explaining one embodiment of the color shift adjustment device for a color cathode ray tube according to the present invention, in which FIG. 1 is a configuration diagram 6, and FIG. 2 is a layout diagram of each ITV camera. Figure 3 is an adjustment flowchart, Figure 4 is a diagram showing the light emitting position of each measurement dot when a bow button occurs, Figure 5 is a diagram showing the position of the electron beam after adjustment, and Figure 6 is a diagram showing the measurement dot. Figures 7 and 8 are diagrams showing the patterns, Figures 7 and 8 are diagrams for explaining the beau baton, Figure 9 is a diagram showing the arrangement of each adjustment magnet, and Figures 10 to 14 are diagrams showing the action of the adjustment magnets. FIG. 15 is a diagram for explaining the conventional adjustment method. 1... Color cathode ray tube, 3.4... Adjustment magnet, 10, 11.12... iTV camera, 13...
- Camera controller, 14... Camera switching unit, 15
...Image processing device, 1-6...Television controller, 17...Magnet operation means, 18.19.
20...Motor, 21...Motor controller, 2
2... Main control section. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] Each image pickup device is arranged at the horizontal center and both ends of the front panel of the color cathode ray tube, a pattern display means for displaying a measurement dot pattern of each color on the color cathode ray tube, and a pattern display means provided at the neck of the color cathode ray tube. two sets of adjustment magnets each consisting of a pair of ring-shaped quadrupole magnets, magnet operation means for operating these adjustment magnets, and images of the measurement dot pattern taken by each of the imaging devices. The amount of movement of the measurement pattern of each color at the center and both ends of the front surface of the panel due to the operation of each of the adjustment magnets is determined, each coefficient for each of the adjustment magnets is determined from these amounts of movement, and the adjustment is performed according to these coefficients. 1. A color shift adjustment device for a color cathode ray tube, comprising an adjustment means for controlling the operation of a magnet operation means.