JPH02213022A - Convergence measuring instrument - Google Patents

Abstract

PURPOSE:To automate measurement using a low-cost instrument by detecting a position of emission where the output of a photoelectric transfer device becomes maximum, and by providing a processor by which a deflecting power source is controlled. CONSTITUTION:A driving source 2 is controlled by a processor 7 through a control signal 7a, and one color, for example, red among three colors of red, green, blue is emitted. A deflecting power source 4 is controlled by a control signal 7b from the processor 7, so as to control an output wave form of the deflecting power source 4. The photoelectric transfer output of a photoelectric transfer device 6 is taken in the processor 7, and the position of emission where the photoelectric transfer output becomes maximum, or a position of the center of gravity for red IR is determined. The same operation is performed for the other two colors in order to determine the position of emission where photoelectric transfer output becomes maximum, or a position of the center of gravity for green or blue, IG or IB. The difference in the deflecting current obtained during the process is the difference in convergence for each color.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a convergence shift measuring device suitable for automating convergence adjustment in the manufacture of color cathode ray tubes or color display devices using color cathode ray tubes.

[Conventional technology]

In the manufacturing process of color cathode ray tubes or color display devices using color cathode ray tubes, in order to reproduce the original colors, the electron beams of each of the three primary colors are arranged in a y4 manner so that the electron beams of each of the three primary colors are concentrated at one point over the entire display surface. ing. This adjustment is usually called convergence adjustment.

Conventionally, regarding the automation of convergence adjustment work, for example, 1.
72, 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 now it is difficult to measure color misconvergence by human visual inspection. The reality is that the convergence shift is being measured.

[Problem to be solved by the invention]

The above-mentioned conventional techniques require expensive large-scale equipment for automation and require a large installation space. In addition, manual work not only required skilled workers, but also had poor working conditions, such as high fatigue.

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

[Means to solve the problem]

The above purpose consists of a magnifying lens placed in front of the light emitting surface of a color cathode ray tube to which a deflection yoke is attached, and a phosphor dot of the color cathode ray tube magnified by the magnifying lens placed behind this magnifying lens. a photoelectric conversion element having a light-receiving portion having a knee size that surrounds one or more sets of dots of three colors; a deflection power source that outputs an output waveform to the deflection yoke to move the electron beam in fixed units; and the photoelectric conversion element. This is achieved by the configuration ζ, which includes a processing device that detects the light emitting position where the output of the beam is maximum and controls the deflection power source.

This can also be achieved by replacing the photoelectric conversion element with a photoelectric conversion element having three light receiving sections, one for each color, and providing three color filters of red, blue, and green in front of this photoelectric conversion element.

This can also be achieved by replacing the above output waveform with an output waveform that moves the raster in fixed units and detecting the position of the raster.

[Effect]

When the electron beam or raster of the color cathode ray tube is moved in fixed units, the output of the photoelectric conversion element reaches its maximum when the electron beam or raster reaches the central axis of the enlarging lens and the photoelectric conversion element. Therefore, the convergence shift can be measured from the positional relationship of the electron beams or rasters when the electron beams corresponding to each of the three primary colors reach their maximum charge conversion output.

Furthermore, the photoelectric conversion element provided with three color filters allows input for each color separately, and can measure the three colors at the same time.

In the above case, if each electron beam or raster is concentrated at one point, so-called convergence, the charging conversion output will be maximum at approximately the same position. If the misconvergence occurs, it will be at its maximum when the electron beam reaches different positions depending on the amount of deviation.

〔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. color cathode ray tube 1
A deflection power source 4 capable of moving the electron beam in fixed units is connected to the deflection yoke 3 mounted on the pot. Further, a magnifying lens 5 is disposed in front of the light emitting surface of the color cathode ray tube 1, and a photoelectric conversion element 6 is disposed behind the magnifying lens 5. The charge conversion output of the photoelectric conversion element 6 is transferred to a processing device 7. The processing device 7 sends a control signal 7a for controlling the main power supply #, 2 and the deflection power supply 4.
, 7b are output.

The photoelectric conversion element 6 has one light receiving section 8 as shown in FIG. The size is such that it surrounds one or more pairs of body dots (B is a blue light body dot).

Next, the measurement method will be explained. Processor! The drive power source 2 is controlled by the control signal 7a from f7, and one color 1, for example, red is emitted from among the three colors red, edge, and blue. Then, the deflection power source 4 is controlled by the control signal 7b of the processing device 7, and the output waveform of the deflection power source 4 is controlled as shown in FIG. That is, when the horizontal deflection current filo is controlled to be in tens of thousands of steps during one stage of the vertical deflection current 9, the electron beam moves laterally on the light emitting surface of the color cathode ray tube 1 due to the horizontal deflection current filO, and then vertically It moves in the vertical direction by the deflection electric current a9.

The charge conversion output of the photoelectric conversion element 6 during the movement of the electron beam is taken into the processing device 7, and the light emission position at which the photoelectric conversion output is maximum or the center of gravity position shown in red in FIG. 4 is determined. If the same operation is performed for the other two colors, the light emission position at which the photoelectric conversion output is maximum or the center of gravity positions NG and IB of green and blue can be found in the same way. The difference in deflection current at this time becomes the convergence shift result for each color. That is, G-R is G, deviation between 13, G-B is G, deviation between 13, and B is 1.

The difference will be between 8 and 8.

FIG. 5 shows another embodiment of the invention. The previous embodiment used one light receiving section 8, but this embodiment uses three light receiving sections 8, 8G, and 8B provided with red, green, and f filters. The light passing through the red filter is Ile, IG,
, 1B, the photoelectric conversion output is larger than that of IO, , fB, and the light passing through the green filter and positive filter is
The conversion output becomes larger.

Therefore, it is not necessary to emit light for each color one by one to obtain a charging conversion output as in the above embodiment, and even if three colors are emitted at the same time to obtain a charging conversion output, each of the three colors can be accurately illuminated without being affected by other colors. The maximum input value or centroid position of the color is determined.

In this way, the convergence shift can be determined from the step difference in the DC current at the maximum output of the photoelectric conversion element 6 or the center of gravity, so the convergence shift can be accurately determined by simply reducing the step of the step waveform of the DC current until the required reading resolution is achieved. can be asked for. Furthermore, since it has a simple configuration using the driving electric current fA2, the deflection power source 4, the magnifying lens 5, the photoelectric conversion element 6, and the processing device 7, an inexpensive device can be obtained.

In the above embodiment, the electron beam was moved by a fixed unit, but the raster is emitted by the signal, and the signal f
The photoelectric conversion output may be obtained by moving the raster.

〔Effect of the invention〕

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

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram of a convergence measuring device according to an embodiment of the present invention, Figure 2 is a diagram of the relationship between the fluorescent dots and the light receiving section of the photoelectric conversion element, and Figure 3 is a diagram of the output waveform of the deflection power source. , (a) is a vertical deflection waveform diagram, lbl is a horizontal deflection waveform diagram,
FIG. 4 is a relationship diagram between photoelectric conversion output and deflection current, and FIG. 5 shows another embodiment of the present invention, and is a relationship diagram of photoelectric conversion output for each color when manually applied through a filter. 1 color cathode ray tube, 3...deflection yoke, 4...
Deflection power supply, 5. Magnifying lens, 6.
Xi conversion element, 7...processing! ! , 8.81
(,, 8G, 8B... Light receiving part〇Figure 1 1; Cuff-1 Down tube 3: Height: l-7 4: (A phrase) I

Claims (1)

[Claims] 1. A magnifying lens placed in front of the light emitting surface of a color cathode ray tube to which a deflection yoke is attached, and a color cathode ray tube placed behind the magnifying lens and magnified by the magnifying lens. a photoelectric conversion element having a light-receiving portion having a size that surrounds at least one set of three colors of phosphor dots; a deflection power source that outputs an output waveform to the deflection yoke to move the electron beam in fixed units; A convergence measuring device comprising a processing device that detects a light emitting position where the output of a photoelectric conversion element is maximum and controls the deflection power source. 2. The convergence measuring device according to claim 1,
A convergence measurement device that detects the position of a raster by using an output waveform that moves the raster in fixed units in place of the output waveform described above.