JPS63127691A - Convergence measuring instrument - Google Patents

Abstract

PURPOSE:To simplify the automatic adjusting device of pre-stage by adding an arithmetic unit calculating mis-convergence to be reached in applying vertical/horizontal turning adjustment to a deflection yoke from information of mis- convergence of at least 4 or over of designated positions on a display screen of a color picture tube to be measured. CONSTITUTION:An arithmetic control circuit 7 has,e.g., a microprocessor as a central processing section and applies operation control to each part according to a control program stored in a memory 8. Simultaneously, image pickup information from a picture memory circuit 6 is calculated to obtain 4 measuring positions of convergence respectively. Moreover, the result of arithmetic operation of the convergence of each measuring position is stored in the memory 8 and the convergence reached by the color picture tube 1 to be measured is calculated based on the stored data and displayed or recorded on a data output device 9. Thus, the automatic adjusting device of the pre-stage is simplified and the manufacturing cost of the complicated automatic adjustment device and the cost and labor for the maintenance are saved.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a concentrated state of three-color electron beams in a three-color picture tube (hereinafter referred to as a color picture tube).

That is, the present invention relates to a convergence measurement device that measures convergence.

(Prior Art) Conventionally, convergence measurement devices for color picture tubes measure misconvergence adjusted by an automatic adjustment device using a complicated adjustment mechanism, as shown in Japanese Patent Publication No. 58-6253, for example. Measurement and evaluation were carried out using a convergence measuring device shown in No.-92270.

(Problem to be Solved by the Invention) However, when only measuring the misconvergence after adjustment to the instep, it is necessary to adjust the deflection yoke vertically and horizontally as a preliminary step. The production and maintenance of this complicated adjustment device required a huge amount of cost and effort.

The present invention has been made in view of the above-mentioned conventional problems, and in the preliminary stage before measurement, only the purity adjustment and the convergence of a part of the screen center are adjusted, that is, the vertical and horizontal deflection yokes are adjusted. Convergence that can determine the amount of misconvergence that can be reached by a color picture tube to be measured even in a state where the direction swing adjustment is not performed and the convergence of the peripheral area is not adjusted from information on the amount of misconvergence of at least four peripheral areas. By providing a measuring device, the purpose is to simplify the automatic adjustment device in the previous stage.

[Structure of the invention]

(Means for solving problems) That is, the present invention is applicable to the color picture tube to be measured.

means for selectively displaying convergence measurement patterns of three colors green and red; an imaging means for imaging each color emission pattern displayed at the same position on a display screen of a color picture tube to be measured with an ITV camera; and this imaging means. In a convergence measuring device that is capable of detecting each of the color light emission patterns obtained by the method and determining the amount of misconvergence from the relative position of each color light emission pattern based on the position information obtained by the imaging means, the color picture tube to be measured is A calculation device is added to calculate the amount of misconvergence that can be reached when the deflection yoke is oscillated in the vertical and horizontal directions from information on the amount of misconvergence at at least four specified positions on the display screen. It is characterized by

(Function) Next, the function will be explained using a diagram. Figure 2 shows a red electron beam pattern (21) and a blue electron beam pattern (22) when the deflection yoke is adjusted vertically.
), and the amount of deflection yoke oscillation and the amount of change in misconvergence are constant values determined by the design of the color picture tube and deflection yoke.

, if the deflection yoke is adjusted to minimize the convergence error, the measured amount shown in Figure 4! (11) and (12) Miss Convergence Ji
From (a) and (b), . Further, from the misconvergence amounts (c) and (d) at measurement positions (13) and (14), . This shows that it is possible to calculate the amount of misconvergence that can be reached from convergence information at four measurement positions without adjusting the deflection yoke.

Figure 3 shows the change in misconvergence of the red electron beam pattern (31) and the blue electron beam pattern (32) when the deflection yoke is oscillated in the horizontal direction. The amount of change in amount and misconvergence is a constant value determined by the design of the color picture tube and deflection yoke, as in the case of vertical oscillation adjustment.

In this case as well, the convergence error is adjusted to the minimum by adjusting the deflection yoke.

From the amount of misconvergence (e) and (f) at measurement points (11) and (12) shown in FIG. 4, can be determined. Also, from the misconvergence Ji(g)(h) at measurement positions (13) and (14), is obtained. This shows that the amount of misconvergence that can be reached can be calculated from the convergence information of the four measurement positions without adjusting the horizontal direction like the vertical direction.

In addition, if the static convergence on the display screen of the color picture tube to be measured (1) is not adjusted sufficiently, add an ITC camera to measure the static convergence amount and perform a, b, 09 dlet L before calculation.
The accuracy can be further improved by correcting the measured quantity g+h. Furthermore, by adding an ITC, it is possible to measure and evaluate other measurement positions, for example, four corners. It goes without saying that if a movable ITV camera equipped with a mechanism is used, the same effect can be obtained with a single ITV camera.

(Example) Next, an example of the convergence measuring device of the present invention will be described with reference to FIG.

That is, the image signals obtained by capturing each pattern displayed at the same position on the display screen of the color picture tube (1) to be measured by the ITV camera (2) are sent to an image memory circuit consisting of an A/D conversion circuit and a buffer memory. Guided by (6).

After being temporarily stored as digital image information in the image memory circuit (6), it is guided to the arithmetic control circuit (7). This arithmetic control circuit (7) has, for example, a microprocessor as a central processing unit, and controls the operation of each part of the device according to a control program stored in a memory (8), and also receives imaging information from the image memory circuit (6). The measurement positions (11), (12), (13) shown in Fig. 4 are calculated.
) and (14), respectively. In addition, the arithmetic control circuit (7) each measurement position (11),
The convergence amount calculation results of (12), (13), and (14) are stored in the memory (8), and based on this stored data, the convergence amount that can be reached by the color picture tube (1) to be measured is determined by the aforementioned procedure. is calculated and displayed or recorded on the data output device (9).

Note that (10) is a generator that generates a plurality of image patterns according to instructions from the arithmetic and control circuit (7), and supplies these patterns to the television electronic circuit (3) to generate the color picture tube to be measured (
1) is displayed.

(Effects of the Invention) As described above, in the convergence measurement device of the present invention, only the purity adjustment and the convergence in a part of the screen center are adjusted, and the deflection yoke is not adjusted in the vertical and horizontal directions, and the convergence in the peripheral area is not adjusted. Since the amount of misconvergence that can be reached by the color picture tube under test can be determined even in an unadjusted state, it is possible to simplify the previous stage automatic adjustment device that has been used in the past. It is possible to reduce the production cost and the cost and labor required for maintenance of a complicated automatic adjustment device.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment of the convergence measuring device of the present invention, Fig. 2 is an explanatory diagram showing misconvergence when the deflection yoke is adjusted vertically, and Fig. 3 is an explanatory diagram showing the misconvergence when the deflection yoke is adjusted vertically. FIG. 4 is an explanatory diagram showing the misconvergence when the head is adjusted in the direction, and FIG. 4 is an explanatory diagram showing the convergence measurement points on the color picture tube screen.

Claims (1)

[Claims] means for selectively displaying convergence measurement patterns of three colors of blue, green, and red on a color picture tube to be measured; an imaging means for taking an image, and the blue, green, and
In the convergence measurement device, which is configured to detect convergence measurement patterns of three colors of red, and to determine the amount of misconvergence from the relative position of each emitted light color based on the position information obtained by the imaging means, At least 4 on the color picture tube display screen
1. A convergence measuring device, characterized in that the amount of misconvergence that can be reached by the color picture tube to be measured can be determined from information on the amounts of misconvergence at at least two designated positions.