JPH01279549A - Misconvergence measuring device - Google Patents

Abstract

PURPOSE:To easily sense the accurate position of an electron beam with simple constitution by controlling movement of electron beam to a certain position using a light deflecting power supply, and sensing the light emission position with max. light reception output form a one-dimensional photoelectric transducer element in vertical orientation. CONSTITUTION:The deflection coil voltage of a color cathode-ray tube 1 is controlled by a light deflecting power supply 4, and an electron beam in the cathode-ray tube 1 moves horizontally a certain unit by unit. The image light from cathode-ray tube 1 generated thereby is received by a cylindrical lens and a one-dimensional photoelectrical transducer element 6 in vertical orientation, and the horizontal misconvergence of each color is determined from the electron beam locational difference where the light reception output maximizes. Through the element 6 the vertical misconvergence is alike decided by movement of electron beam in the vertical direction, and the position of the electron beam is measured precisely by a simple constitution to accomplish determination of misconvergence.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to the manufacture of color cathode ray tubes or the manufacture of color display devices using color cathode ray tubes (in this case, automation of convergence adjustment (this preferred method for adjusting convergence Measuring equipment (related to this)

[Conventional technology]

The manufacturing process of color cathode ray tubes or the manufacturing process of color display devices using color cathode ray tubes (in this process, the electron beams for each of the three primary colors are concentrated at one point over the entire display surface in order to reproduce the original color). This adjustment is usually called convergence adjustment.

Conventionally, regarding the automation of convergence adjustment work, for example, [Development of automatic color cathode ray tube purity/convergence adjustment device] (IEICE Technical Report IE77-
72. Discussed in August 1978. However, this equipment is large-scale and very expensive.

By the way, even though the light-emitting surface of a color cathode ray tube is large, it is used to measure minute color shifts (misconvergence), and the conventional technology described above requires a large-scale device, so even today, it is still difficult for humans to measure color misconvergence. The reality is that the convergence shift is measured visually.

[Problem to be solved by the invention]

The above-mentioned prior art requires expensive large-scale equipment and requires a large installation space compared to automated pots.

In addition, it is not only necessary to use skilled workers manually, but also to
There were problems with working conditions such as high fatigue.

An object of the present invention is to provide a convergence shift measuring device that can automate measurement using an inexpensive device.

[Means to solve the problem]

The above purpose is to create an output waveform that moves the front surface of the light emitting surface of the color cathode ray tube (on which the deflection yoke is attached) in a vertical direction (a one-dimensional photoelectric conversion element with a divided light receiving structure arranged in this way) and the electron beam of the color cathode ray tube in fixed units. This is achieved by a configuration including a deflection power source that outputs the deflection yoke, and a processing device that detects the light emission level fili at which the edge of the photoelectric conversion element is maximized and controls the deflection power source.

[Effect]

The one-dimensional photoelectric conversion element placed in the vertical direction obtains a horizontal image of the light-emitting dots of the color cathode ray tube. The maximum is reached when the beams reach each other.In other words, if the electron beams of each color are concentrated at one point (so-called convergence), the photoelectric conversion output will be maximum at almost the same position, but if there is misconvergence, Displacement amount i
Accordingly, it becomes maximum when the electron beam reaches different positions.

Therefore, by moving the electron beam in fixed units, the position of the electron beam can be determined accurately and easily.
This allows the convergence shift to be measured.

〔Example〕

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 color cathode ray tube 1 by a driving power source 2. As shown in FIG. A deflection power source 4 is connected to the deflection yoke 3 and is capable of moving the electron beam in fixed units. In addition, a cylindrical lens 5 is arranged vertically in front of the light emitting surface of the color cathode ray tube 1. Behind the cylindrical lens 5, as shown in FIG. A one-dimensional photoelectric conversion element 6 having a divided light-receiving structure consisting of cells 61 to 6n is similarly arranged in the vertical direction ζ.This light is subjected to photoelectric conversion output (or signal processing by a processing device) of the conversion element 6.

Further, the processing device 7 outputs a control signal 7a17b for controlling the drive #L source 2 and the deflection power source 4.

Next, the measurement method will be explained. The drive power supply 2 is controlled by the control signal 78 from the processing device 7, and the three
Let one of the colors emit light.

Then, the deflection power source 4 is controlled by the control signal 7b of the processing device 7.
is controlled, and the output waveform of the deflection power source 4 is as shown in Fig. 3 (
When the horizontal deflection current 9 is controlled to have tens of thousands of steps in one film of the vertical deflection current 8, the light emitting point 10 sequentially moves right sideways as shown in FIG. When the horizontal movement is completed, the light emitting point 10 moves one step downward, and the same operation is repeated.

When this operation is viewed from FIG. 5I, the photoelectric conversion output 11 of the photoelectric conversion element 6 depending on the horizontal position at the vertical position vi takes the form shown in FIG. Therefore, the photoelectric conversion output 11 of C can be obtained for the three primary colors, and the lateral misconvergence -it+ can be calculated from the difference in the horizontal deflection position when each becomes maximum.

Next, misconvergence in the vertical direction will be explained. Now, as shown in FIG. 7, considering the light emitting point 10 in a vertical position, the light receiving surface of the light receiving cells 61 to 6n of the photoelectric conversion element 6 facing the light emitting point 10 has the maximum photoelectric conversion output. The output power incident on the photoelectric conversion element 6 (expressed as CO8θ) decreases as the photoelectric conversion element 6 is displaced vertically from the light-receiving surface. The distance can be easily determined from the positions of the light receiving cells 61 to 6n on the light receiving surface, so below,
It can be determined in the same manner as the horizontal convergence shift described above.

In this way, the convergence shift can be found from the position of the light receiving cells 61 to 6n at the point where the output of the original conversion element 6 is maximum and the step difference in the staircase waveform, so the step of the staircase waveform can be reduced to the required convergence shift reading resolution. ,
Alternatively, an accurate convergence shift can be obtained by simply reducing the size of the divided cells 61 to 6n of the photoelectric conversion element 6. Since it has a simple configuration as explained above, an inexpensive device can be obtained.

It should be noted that if the cylindrical lens 5 is provided as shown in this embodiment, the light will be focused in the horizontal direction, covering a certain range in the horizontal direction, and the measurement accuracy will be further improved.

〔Effect of the invention〕

According to the invention, the convergence shift can be accurately and automatically determined using an inexpensive device.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an embodiment of the present invention, Fig. 2 is a front view of a light converting element, and Fig. 3 shows an output waveform of a deflection power source. h) is a horizontal deflection waveform diagram, Figure 4 is an explanatory diagram of movement of the light emitting point, Figure 5 is a front view showing the relationship between the color cathode ray tube and the photoelectric conversion element, Figure 6 is an output diagram of the photoelectric conversion element, and Figure 7. FIG. 2 is a vertical cross-sectional explanatory diagram showing the relationship between a light emitting point and a photoelectric conversion element. DESCRIPTION OF SYMBOLS 1... Color cathode ray tube, 3... Deflection yoke, 4... Deflection power supply, 5... Cylindrical lens, 6... -dimensional photoelectric conversion element, 7... Processing device. Figure 1 6: - Yamoto Kyuden Bag 4 Aoi Toki 7: Go to processing 1 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. A one-dimensional photoelectric conversion element with a divided light receiving structure arranged vertically in front of the light emitting surface of a color cathode ray tube to which a deflection yoke is attached, and the electron beam of the color cathode ray tube are moved in fixed units. A convergence shift measuring device comprising: a deflection power source that outputs an output waveform to the deflection yoke; and a processing device that detects a light emission position where the output of the photoelectric conversion element is maximum and controls the deflection power source. 2. A one-dimensional photoelectric conversion element with a divided light-receiving structure arranged vertically in front of the light emitting surface of the color cathode ray tube equipped with a deflection yoke, and a corresponding one-dimensional photoelectric conversion element placed between the color cathode ray tube and the photoelectric conversion element. a cylindrical lens,
a deflection power source that outputs an output waveform for moving an electron beam of a color cathode ray tube in fixed units to the deflection yoke; a processing device that detects a light emission position at which the output of the photoelectric conversion element is maximum and controls the deflection power source; Convergence shift measuring device equipped with