KR920005023B1 - Measuring equipment of convergence aberration - Google Patents

Abstract

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Description

Convergence misalignment measuring device of color CRT

1 is an overall configuration diagram according to a first embodiment of the present invention.

2 is a diagram showing a positional relationship between a light emitting point and a photoelectric conversion element according to the first embodiment.

3 is a view showing the shape of the horizontal and vertical deflection current according to the present invention.

4 shows a scanning method of an electron beam.

5 is a graph showing coordinates of the maximum value of the photoelectric conversion output for each horizontal scan line.

6 shows a scanning method of an electron beam.

7 is a graph plotting the maximum value of photoelectric conversion output for each vertical scan line.

8 is a specific block diagram of a control circuit according to the first embodiment.

9 (a) and 9 (b) are flowcharts for performing measurements of the first embodiment.

10 is a diagram showing a positional relationship between a phosphor and a photoelectric conversion element according to the second embodiment of the present invention.

FIG. 11 is a diagram showing the shapes of horizontal and vertical deflection currents according to the second embodiment; FIG.

12 shows a scanning method of an electron beam.

13 is a graph showing the relationship between the horizontal deflection current and the maximum value of the photoelectric conversion output.

14 is a flowchart for carrying out the measurements of the second embodiment.

FIG. 15 is a diagram showing a positional relationship between a phosphor and a photoelectric conversion element according to the third embodiment of the present invention. FIG.

FIG. 16 is a diagram showing the shapes of horizontal and vertical deflection currents according to the third embodiment; FIG.

17 shows a scanning method of an electron beam.

18 (a), (b) and (c) are graphs showing the relationship between the horizontal deflection current and the maximum value of each photoelectric conversion output.

19 is a diagram showing the positional relationship between the phosphor and the photoelectric conversion element according to the fourth embodiment of the present invention.

20 and 21 are flowcharts for performing measurements of the third and fourth embodiments.

FIG. 22 is a diagram showing a specific configuration of a control circuit according to the third embodiment and the fourth embodiment. FIG.

* Explanation of symbols for main parts of the drawings

1: Color Brown Tube 2: Driving Power

3: deflection yoke 4: deflection power source

5: magnifying lens 6: photoelectric conversion element

7: light emitting point 8: control device

9a, 9b: control signal 10: vertical deflection current

11: horizontal deflection current

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convergence misalignment measuring apparatus suitable for automating convergence adjustment in the manufacture of a color brown tube or a color display device using a color brown tube.

In the manufacturing process of the color brown tube or the manufacturing process of the color image display apparatus using the color brown tube, in order to faithfully reproduce the color of the image, the three primary colors electron beams are focused on one point of each pixel for the entire display screen area. have. This adjustment is usually called a convergence adjustment.

Conventionally, automation of convergence adjustment work is disclosed, for example, in "Development of a color-brown tube purity convergence automatic adjustment device" (Technical Report IE 77-72, 1978). However, this device is large and very expensive.

In addition, even though the light emitting surface of the color CRT is large, only a slight color shift (misconvergence) is measured. Therefore, since the conventional technology is a large-scale device, the convergence shift is still measured by human vision. There is a situation.

The prior art requires an expensive large-scale device for automation and a large installation space. In addition, workers had to be skilled workers, and there was a problem of working conditions such as heavy work fatigue.

SUMMARY OF THE INVENTION An object of the present invention is to provide a convergence shift measurement device capable of automating convergence shift measurement at low intervals.

An apparatus for measuring convergence misalignment of a color brown tube of the present invention for achieving the above object includes a photoelectric conversion element for detecting the intensity of light from a light-emitting body of a screen of a CRT and generating an output signal according to the intensity of the light, and an electron beam. A deflection power source for generating a deflection signal, a red electron beam, a green electron beam, and a blue electron beam to deflect a predetermined unit length in a predetermined direction of the screen in response to the deflection signal, respectively. The driving power source for deflecting and the output signal from the photoelectric conversion device are collected at predetermined timings in synchronization with the deflection signal, and the luminous intensity of red, green, and blue is maximized among the output signals. The position of the screen image is detected and the convergence is based on the difference in the elevation distance between the positions of the detected maximum luminous intensity. It consists of a control device for determining a namryang.

When the electron beam of the color brush tube is moved at a predetermined unit length, the output of the photoelectric conversion element is maximized when the electron beam reaches the light emitting body passing through the central axis of the photoelectric conversion element. Therefore, the convergence shift can be measured from the electron beam positional relationship when the photoelectric conversion output is maximized for the electron beams corresponding to the three primary colors. In other words, if each electron beam focuses on one point, the photoelectric conversion output is maximized at almost the same position when the so-called convergence is in agreement, but if there is misconvergence, the maximum point of the photoelectric conversion output by each electron beam becomes the same position. Do not. The difference between the positions of the maximum points is the convergence shift amount.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a predetermined voltage is applied to the electron gun of the color brown tube 1 by the driving power source 2. As shown in FIG. The deflection yoke 3 is connected to a deflection power source 4 capable of moving the electron beam by a predetermined unit length. In addition, an enlarged lens 5 is disposed on the front surface of the light emitting surface of the color brown tube 1, and a photoelectric conversion element 6 (sensor) is disposed behind the enlarged lens 5. Here, the magnifying lens 5 and the photoelectric conversion element 6 are enlarged to one light emitting point 7i among the light emitting points 7 on the inner surface of the color brown tube 1, as shown in FIG. The center positions of the lens 5 and the photoelectric conversion element 6 are arranged to coincide. The photoelectric conversion output of the photoelectric conversion element 6 is signal processed by the control device 8. Further, control signals 9a and 9b for controlling the drive power source 2 and the deflection power source 4 are output from the control device 8.

Next, a measuring method is demonstrated. The drive power supply 2 is controlled by the control signal 9a from the control device 8, and one of three colors of red, green, and blue is emitted. Then, the deflection power source 4 is controlled by the control signal 9b of the control device 8, and the output waveform of the deflection power source 4 is shown in FIG. If the stage is controlled to be about tens of thousands of stages of the horizontal deflection current 11, the light emitting point 7 sequentially moves in the horizontal direction as shown in FIG. At the end of the horizontal movement, the light emitting point 7 moves down one step and repeats the same operation.

Referring to FIG. 2, the light emitting point 7 on the vertical plane passing through the optical axis of the photoelectric conversion element 6 is moved from top to bottom.

When the light emitting point 7i of the electron beam is reached, the center of the light emitting point 7i and the photoelectric conversion element 6 coincide with each other, so that the photoelectric conversion output is maximized. The light output incident on the photoelectric conversion element 6 from the light emitting points in the upward and downward directions from the luminous material 7i is L _max . COSθ [L _max : maximum photoelectric conversion output, θ: angle of light emission position with respect to the optical axis passing through the photoelectric conversion element 6 and the light emitting point 7i]. Therefore, the photoelectric conversion output decreases as the light emitting position moves away from the point 7i. The light emitting position at which the photoelectric conversion output of the photoelectric conversion element 6 is maximized is calculated and calculated by the controller 8. Therefore, when the light emitting position where the photoelectric conversion output is maximized is obtained for each of the three colors of red, green, and blue, and the deviation of each light emitting point is calculated by the control device 8, this is determined by screening. There is a convergence shift in the vertical direction. Similarly with respect to the horizontal convergence misalignment of the screen, the light emission position is obtained from the step difference of the stepped waveform applied to the deflection yoke 3, and can be obtained from the difference between the maximum points in the three color photoelectric conversion outputs. have.

Next, the procedure for calculating the convergence shift amount with the control device 8 of FIG. 1 and the specific configuration of the circuit will be described in more detail with reference to FIGS. 4 to 9 (b).

The fifth is to turn the electron beam corresponding to a given color, the fourth, as shown in Fig performs a horizontal scan, each horizontal scan line _{(V P = 0,1,2, ... C} ... n) the maximum amount of light emission of the ( The maximum value of the photoelectric conversion output) is shown in the coordinates. From Fig. 5, the electron beam of this color gives the peak of the photoelectric conversion output at the position of the photoelectric conversion element. When the convergences match, photoelectric conversion output characteristics having a peak at the same V _P = C point as in Fig. 5 are obtained when scanning two different color electron beams as shown in Fig. 4, respectively. If the convergences do not match, the peaks of the three colors are different.

The measurement of the convergence shift amount in the horizontal direction only rotates 90 DEG C in the scanning direction in FIG. 4, and the rest is the same as the measurement of the convergence shift in the vertical direction described above. FIG. 6 shows the scanning method of the electron beam, and FIG. 7 shows the characteristics of the maximum values for the respective scanning lines H _P = 0, 1, 2, ... C ... n of the output of the photoelectric conversion element 6. Indicates. If the convergence in the horizontal direction is consistent, the photoelectric conversion outputs of all colors have a peak value at the position of the photoelectric conversion element 6. If the convergence does not match, each color will have a different position of the peak value.

8 shows a specific configuration of the control device 8. In the embodiment of FIG. 8, the control device 8 includes a CPU composed of a microprocessor, a memory, a clock / timing signal generator, an analog / digital converter (A / D), and an amplifier (AMP). The CPU incorporates a program for executing the flowcharts shown in Figs. 9A and 9B. The CPU measures the maximum light emitting position in the horizontal direction and the maximum light emitting position in the vertical direction according to the programs of FIGS. 9A and 9B. This program is used three times, one for each of three colors. The CPU also outputs the vertical and horizontal deflection signals Pb to the deflection power source 4 as shown in FIG. The pattern of this deflection signal is stored in the memory. The CPU also applies a command signal 9a for generating an electron beam of a predetermined color to the drive power source 2.

The above content will be described in detail with reference to FIGS. 8, 9 (a) and 9 (b). The amplifier AMP is a current / voltage conversion amplifier for converting a small photocurrent (a few mA conductance) from the photoelectric conversion element 6 into a voltage and amplifies up to several V which is an optimal input level for an analog / digital converter. .

The analog / digital converter A / D converts the analog signal into a digital signal according to the instructions of the CPU and the clock / timing generator. The memory is used for storing the control program of the CPU and storing the arithmetic processing data and at the same time storing the output data of the analog / digital converter A / D.

The data of the horizontal emission position (H _P ) and the vertical emission position (V _P ) output from the CPU are converted into analog signals by the digital / analog converter (D / A), and then the horizontal and vertical deflection signals ( 9b) is applied to the deflection power source 4.

The shift display indicates the convergence shift amount determined by measurement and calculation. Next, the overall operation will be described. The CPU sends a command to the RG B switch 9a to emit one color. Next, in synchronization with the timing signal 100 in the clock / timing generator, the CPU outputs the horizontal light emitting position H _P and the vertical light emitting position V _P data. The data of the two horizontal light emitting positions H _P and the vertical light emitting positions V _P are applied to the respective D / As through the AND circuit together with the gate signal 101 of the clock / timing generator, and are used as the analog signal. After the conversion, the amplifiers are amplified to predetermined levels by the amplifiers 102a and 102b and applied to the deflection power source 4 as horizontal and vertical deflection signals 96. After the clock / timing generator outputs the gate signal 101, the clock / timing generator delays for more than a time until the light emission of the color CRT becomes stable, and then outputs the gate signal 103 which becomes a start command of the A / D conversion. Further, the CPU outputs the light emission position output completion signal 104 each time the update of the horizontal light emission position H _P and the vertical light emission position V _P is completed.

The AND (logical) of the gate signal 103 and the light emission position completion signal 104 is taken to perform the conversion operation of the A / D converter A / D as the A / D conversion start signal 105.

The photoelectric conversion signal digitally signaled by the A / D conversion is stored in the memory. In this case, it goes without saying that the photoelectric conversion signal is stored together with the information of the horizontal light emitting position H _P and the vertical light emitting position V _P.

The above operation can be repeated to obtain the conversion output for each light emitting position.

In addition, with reference to Fig. 9A, the measurement processing of the maximum light emitting position in the horizontal direction will be described. Following the start of the program 200, in the process 201, the horizontal light emission position H _P and the vertical light emission position V _P are each set to zero. In this state, the light emitting position is located on the upper left of the screen. Next, in process 203, the output of the photoelectric conversion element (sensor) is A / D converted and stored in the memory. Next, the value of the previous value + 1 is set at the vertical light emitting position V _P. Thus updated and stored in a vertical position emission (V _P), the maximum value of the output of the coupling to come back to the point 202, the photoelectric conversion element (sensor) to reach the (MAX), A / D conversion by the memory. When the vertical light emitting position V _P reaches the maximum value, the processing proceeds to the next processing 206. In this process 206, from among the set of the output of the photovoltaic device obtained by repeating the process 203 ~ processing unit 205, that is, data that is stored in the memory to the V _P = MAX-1 from the V _P = 0 The maximum data is stored at the horizontal light emitting position (H _P = 0) as the output of the photoelectric conversion element.

Next, in process 207, the vertical light emission position V _P is set back to zero. In addition, the horizontal light emission position H _P is set as the previous value +1. The process returns to the coupling point 202 and repeats the processes 203 to 208 until the updated horizontal light emitting position H _P reaches the maximum value MAX.

Turning to the above process to the drawing, the movement of the light-emitting point is as shown in Figure 6, first, the horizontal light-emitting position perpendicular to the light emitting position in the (H _P = 0) perpendicular to the light-emitting location (V _p = 0) to the other words in the upper The light emitting points are sequentially moved to the lower end of (V _P = MAX), and the photoelectric conversion output for each light emitting point is obtained, and the maximum value is represented as the representative value. Next, the horizontal light emission position H _P is updated to obtain a representative value in the same manner. The representative value is a maximum value of a distribution of photoelectric conversion outputs for each light-emitting horizontal position (H _P) as shown in claim 7, FIG.

In addition, the measurement processing of the maximum light emission position in the vertical direction will be described with reference to Fig. 9B. This program is a process in which the horizontal and vertical directions of the measurement process in Fig. 9A are replaced.

Following the start of the program 300, in the process 301, the horizontal light emission position H _P and the vertical light emission position V _P are each set to zero. In this state, the light emitting position is located on the upper left of the screen. Next, in process 303, the output of the photoelectric conversion element (sensor) is A / D converted and stored in the memory. Next, the value of the previous value + 1 is set at the horizontal light emission position H _P. In this way, the updated horizontal light emitting position H _P is returned to the coupling point 302 until the maximum value MAX is reached, and the output of the photoelectric change element (sensor) is A / D converted and stored in the memory. When the horizontal light emission position H _P reaches the maximum value, the process proceeds to the next process 306. In this process 306, the maximum of the data stored in the memory from the output of the photoelectric conversion element obtained by repeating the above processes 303 to 305, that is, from H _P = 0 to H _P = MAX-1. The data is stored at the vertical light emitting position (V _P = 0) as the output of the photoelectric conversion element.

Next, in process 307, the horizontal light emission position H _P is set again to zero. In addition, the vertical light emission position V _P is set as the previous value +1. In this way it is executed to update the vertical light-emitting position (V _P) to come back to the coupling point (302) until it reaches the maximum value (MAX) to repeat the process 303 ~ 308.

Referring to the drawings, the movement of the light emitting point is first performed at the horizontal light emitting position H _p with respect to the vertical light emitting position V _P = 0, i.e., at the left end. The light emitting point is sequentially moved to the right end of H _P = MAX), and the photoelectric conversion output for each light emitting point is obtained, and the maximum value is the representative value. Next, the vertical light emission position V _P is updated to obtain a representative value in the same manner. The representative value is a maximum value of the distribution of the photoelectric conversion output on the V _P, as shown in FIG. 5.

Measurements in Figs. 9A and 9B are sequentially measured for three colors, and the convergence shift amounts in the vertical and horizontal directions are determined by calculation based on the obtained data. The expression is as follows.

Next, a second embodiment of the convergence shift measuring apparatus of the present invention will be described. In the first embodiment described in the above description, in the case of the measurement of the convergence shift in the horizontal direction, in order to measure the scanning direction of the electron beam as shown in FIG. It was necessary to replace the deflection currents with each other. In addition, the frequency of this stepped vertical and horizontal deflection current requires high precision for positioning. In the second embodiment, it is not necessary to replace the vertical and horizontal deflection currents in order to measure the convergence shift in the horizontal direction. In addition, since the circuit configuration of the second embodiment does not change fundamentally in the drawings (FIGS. 1 and 8) of the first embodiment, only the differences between the measuring method and the configuration of the convergence misalignment will be described next.

On the inner surface of the color brown tube 1, as shown in FIG. 10, three kinds of phosphor dots R ₁ to R ₈ , G _{1 to} G ₈ , and B _{1 to} B ₈ form a triangle and are arranged regularly. . The light receiving surface 5a of the photoelectric conversion element 5 has a phosphor dot horizontal pitch P _H so as to detect three phosphor dots in the horizontal direction. The vertical width is formed in the same manner as the phosphor-dot vertical pitch (P _V ).

The following describes the measurement method. According to the control signal 9a from the control device 8, one of three colors of red, green, and blue is emitted. Then, the deflection power source 4 is controlled in accordance with the control signal 9b of the control device 8, and the vertical deflection current I _V is stepped as shown in FIG. At the same time, the electron beam of the color brown tube 1 is deflected by a stepped waveform in which the vertical deflection current I _{V of one} step is the horizontal deflection current I _H of about tens of thousands of steps.

At this time, the movement of the electron beam is shown in FIG. The light emitting point Pi by the phosphor dot is sequentially moved in the horizontal direction, is moved down one step at the end of the horizontal movement, and the same operation is repeated to perform scanning. By the scanning, the change of the conversion output I _S of the photoelectric conversion element 6 due to the horizontal deflection current I _H flowing through the deflection yoke 3 is observed in three colors. The distribution is as shown. This shows the distribution when the light emitting point Pi passes over the phosphor notes B ₁ , G ₁ , and R _{1 in} the light receiving surface 5a of the photoelectric conversion element 6.

By the way, the convergence is that all three primary colors are concentrated at one point on the fluorescent surface, but are actually shifted by the pitch of the minute phosphor dots. In other words, when the shift amounts GB, BR and GR of the maximum value of the conversion output I _S between the three primary colors are 1 pitch or GR is 2 pitches, the convergence shift is zero. If the shift is more than one pitch or less, the convergence is shifted. This deviation can be easily obtained with high accuracy from the difference in the horizontal deflection current I _H.

The calculation method of the convergence shift amount in the second embodiment will be described in detail below. The measurement of the convergence shift amount in the longitudinal direction is the same as in the first embodiment. In other words, the maximum point in the vertical direction of each beam is determined according to the flowchart of FIG. Next, the CPU determines the maximum point in the horizontal direction according to the flowchart shown in FIG. 14 and the arithmetic expression shown in the first embodiment. Once the maximum point in each direction is determined, the convergence shift amounts DH and DV in each direction are calculated as described in the first embodiment. The program that controls the execution of this flowchart and expression is stored in memory.

Next, a third embodiment of the convergence shift measurement device of the present invention will be described. Since the overall configuration of the apparatus is the same as that of FIG. 1, only the parts different from the first embodiment will be described. However, in this embodiment, the magnifying lens 5 is not necessary.

Three photoelectric conversion elements 5a, 5b, and 5c are arranged horizontally in front of the screen of the color brown tube 1 as described later. The photoelectric conversion elements 5a, 5b This photoelectric conversion output is signal-processed by the control circuit 8.

On the inner surface of the color brown tube 1, as shown in FIG. 15, the phosphor dots R, G, and B of three primary colors are arranged regularly in a triangle. With respect to the phosphor dot arrangement, the three photoelectric conversion elements 5a, 5b, and 5c are combined in two different colors, i.e., 5a is R and G, and 5b is G and B , (5c) is arranged in the horizontal direction so as to be a combination of R and B. The interval l between the three photoelectric conversion elements 5a, 5b, and 5c denotes the vertical dimension y of the photoelectric conversion elements 5a, 5b, and 5c, and the horizontal dimension X. If so, select and place the value shown in the following formula.

l = 3, P _H , n + 0.5, P _H , m ＞ X

Provided that P _H <X <1.5, P _H

positive integer with n = 0

m = 1 to 5

In the above formula, in order to combine two colors among the three colors, the horizontal dimension X of the sensor must be at least P _H or more. In addition, the remaining one color does not completely enter the sensor, and in order to suppress the output size to about 1/2, it is necessary to limit it to 1.5 times or less of P _{H at} the maximum.

Therefore, X must be P _H <X <1.5, P _H.

3P _H. n means the interval between phosphors of the same color, and 0.5P _H. m is for the sensor adjacent to one sensor to have 1 / 2P _H misalignment for selecting another two colors. In addition, 3P _H. n + 0.5P _H. The condition where m is greater than X is to prevent the three sensors from overlapping.

Next, a measuring method is demonstrated. The control signal 9a from the control device 8 causes one of the three colors of red, green, and blue to emit light. Then, the deflection power source 4 is controlled by the control signal 9b of the control device 8, and as shown in FIG. 16, the output waveform of the deflection power source 4 is applied to the vertical deflection current I _V. At the same time, the electron beam of the color brown tube 1 is deflected by a stepped waveform in which the vertical deflection current I _{V of one} step is the horizontal deflection current I _H of about tens of thousands of steps.

At this time, the movement of the electron beam is shown in FIG. The light emitting point Pi by the phosphor dot is sequentially moved in the horizontal direction, is moved down one step at the end of the horizontal movement, and the same operation is repeated to perform scanning. By this scanning, if the change in the conversion output I _S of the three photoelectric conversion elements 5a, 5b, and 5c due to the horizontal deflection current I _H flowing through the deflection yoke 3 is seen, As shown in Figs. 18A, 18B, and 5C, the photoelectric conversion elements 5a, 5b, and 5c have a different color combination peak.

By the way, the convergence should concentrate on one point in the fluorescent surface, but in reality the deviation is as much as the pitch of the minute phosphor dot. That is, if the position shifts RG, GB, and RB of the peaks of the conversion output I _S between the two different colors are 1 pitch, the convergence shift is zero. If the shift is greater than or equal to 1 pitch, the convergence is shifted. This deviation can be easily obtained with high accuracy from the difference in the horizontal deflection current I _H.

19 shows a fourth embodiment of the present invention. The magnification lens 5 is arranged between the color brown tube 1 and the photoelectric conversion elements 5a, 5b, and 5c of the present embodiment, and the rest is the same as in the third embodiment. In general, the size of the phosphor dots (R), (G), and (B) is 100 µm Ø, and the interval between the adjacent phosphor dots in the horizontal direction is 50 µm.

Therefore, in the case of the third embodiment, considering the holder supporting the photoelectric conversion elements 5a, 5b, 5c, etc., (l) shown in FIG. 15 should be 3-4 mm, The three photoelectric conversion elements 5a, 5b, and 5c need to be arranged to detect two different colors for positions separated from each other.

In contrast, in the fourth embodiment, the light emitting points of the phosphor dots adjacent to the photoelectric conversion elements 5a, 5b, and 5c shown in FIG. 19 are enlarged by the magnifying lens 7, and the photoelectric conversion element 5a ), (5b), and (5c) together, the photoelectric conversion elements 5a, 5b, and 5c can detect other two colors in the vicinity, and inexpensive photoelectric conversion using the optical magnification. It can be adapted to the size of the device.

The determination of one maximum light emitting point in the vertical direction and the horizontal direction according to the third and fourth embodiments determines the CPU based on the flowcharts in FIGS. 20 and 21 and the arithmetic expressions shown below. The configuration of the control circuit 8 is shown in FIG.

20 is a flowchart of the measurement used to calculate the convergence shift in the vertical direction.

The flow of processing is the same as in FIG. 9 (a). The difference from FIG. 9 (a) is that the A / D conversion of the sensor output in the process 403 causes the switches SW ₁ to SW ₃ shown in FIG. 22 to be connected together. The sum of three inputs (5a) to (5c) is used for A / D conversion.

21 is a flowchart of the measurement used to calculate the convergence shift in the horizontal direction. In addition, the above flowchart is shown for the red beam, and for green and blue, (R _VP ) in the processing 501 may be replaced with (G _VP ) and (B _VP ).

An example of a red beam will be described with reference to the drawings. The maximum point (R _VP ) in the vertical direction of the red beam is determined by FIG. 20. Next, in process 501, the vertical light emission position V _P is set to the data of (R _VP ). In addition, the horizontal light emission position H _P is set to zero. The A / D conversion output of the sensor output for this advantage is stored in the memory (process 503). At this time, the input from the sensor connects the switches SW ₁ to SW ₃ one by one to obtain three types of data of the sensors 5a to 5c. Next, in the processing 505, the horizontal light emitting position H _P is updated, and the processes 503 to 506 are repeatedly executed until the horizontal light emitting position H _P reaches the maximum value MAX. .

When the processing is completed, the data stored in the memory obtains the distribution as shown in FIG.

Moreover, you may perform calculation by selecting two colors with a large output from each sensor 5a-5c.

22 is a block diagram which shows the control apparatus 8, and is basically the same as that of FIG. Only parts different from those in FIG. 8 will be described below.

In the third and fourth embodiments, the photoelectric conversion elements 5a, 5b, and 5c are arranged to obtain a photoelectric conversion output from each photoelectric conversion element. Therefore, the photoelectric conversion elements 5a, 5b, and 5c are connected to the switches SW ₁ , SW ₂ , and SW ₃ , respectively. Further, by switching the switches sequentially so that any one of the switches SW ₁ , SW ₂ , and SW ₃ is in a closed state and the other two are in an open state, the photoelectric change elements 5a and 5b are provided. And photoelectric conversion outputs (5c) are sequentially taken into the memory. The resistor connected to the rear end of each switch is for adjusting the output levels of the three photoelectric conversion elements to be averaged. In addition, since a signal is directly applied from the clock / timing generator to the A / D converter, the logic with the light emitting position output completion signal from the CPU as shown in FIG. 8 is not necessary.

According to the present invention, the convergence shift can be easily obtained by a simple and inexpensive device. In addition, despite the simple configuration, it is possible to improve the accuracy by 20 to 30 times the human visual accuracy.

In addition, in the present invention, since the discontinuity of the measurement by the shadow mask of the color brown tube does not occur as in the conventional apparatus, the speed of the convergence misalignment measurement is 10 times and the accuracy is 2 to 2 compared with the conventional digital chemical processing apparatus. It can be easily achieved by three times.

Claims (8)

In the apparatus for measuring the convergence deviation of a color brown tube, the screen includes a photoelectric conversion means (6) which detects the intensity of light from the light-emitting illuminant of the tube (1) and generates an output signal according to the intensity of the light, and the electron beam The electron beam deflection signal generating means 4 for generating a deflection signal for deflecting by a predetermined unit length in a predetermined direction of the beam; and a red electron beam, a green electron beam, and a blue electron beam respectively corresponding to the deflection signal. A deflection means (2) and an output signal from the photoelectric conversion means are harvested at a timing synchronized with the deflection signal for each predetermined unit length so as to scan the screen impression of the CRT, and red, green and Detects the position of the screen in which the luminous intensity of blue is the maximum, and converts it based on the distance difference between the detected maximum positions. Convergence displacement measuring device of the color picture tube, characterized in that consists of calculation means (8) for determining the scan displacement. 2. The photoelectric conversion means according to claim 1, wherein the photoelectric conversion means comprises: an optical lens (5) for enlarging the light from the light-emitting body of the screen with a predetermined magnification, and an electric light that receives light passing through the optical lens and is proportional to the intensity of the light. And a photoelectric conversion element (6) for outputting a signal. 3. The calculation unit (8) according to claim 2, wherein the calculation means (8) calculates a position at which the output of the photoelectric conversion element for each scan line is maximized with respect to electron beams of each color, and calculates this electron beam of two different colors. And a means for performing a calculation for determining a difference in convergence in the direction orthogonal to the scan line by obtaining a difference between the results. 4. The calculation unit (8) according to claim 3, wherein the calculating means (8) extracts the output of the photoelectric conversion means (6) for each of the predetermined unit lengths based on the light emission intensity on each scan line,

And a means for performing an operation for calculating the amount of convergence deviation by performing the calculation of. The photoelectric conversion unit (6) according to claim 1, wherein the photoelectric conversion means (6) has a horizontal direction having a length including three of the pore bodies and a vertical direction having a light receiving surface having a length of one light emitting body (Fig. 10, 5a, 5b), wherein the convergence misalignment measuring device of the color brown tube. The photoelectric conversion means (6) according to claim 1, wherein three photoelectric conversion elements (FIG. 15, 5a, 5b, 5c) having a light receiving surface having a size in which two light emitters are completely included are arranged horizontally. And a convex deviation measurement device for a color brown tube, which is arranged to face the screen. 7. The quenching surface of the photoelectric conversion element 6 has a dimension of x in the horizontal direction, y in the vertical direction, and l for the distance between the photoelectric conversion elements. l = 3. P _H. n + 0.5 P _H. m ＞ x Provided that P _H <x <1.5. P _H n = positive integer containing zero m = 1 to 5 Convergence misalignment measuring device of a color brown tube, characterized by the following equation. 7. The optical lens (5) according to claim 6, wherein the photoelectric conversion means (6) further extends the light from the light emitter at a predetermined magnification between the photoelectric conversion element and the screen to guide the photoelectric conversion element to the photoelectric conversion element. ) Is configured to add a color brown tube convergence deviation measurement device.

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