JPS59933B2 - Color: Brown - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring the emission intensity distribution of a phosphor coated on the inner surface of a face plate of a color cathode ray tube.

The fluorescent surface of a color cathode ray tube consists of 100 to 700 phosphors that emit red, green, and blue to reproduce any color tone.
It is composed of microscopic pieces with a size of μ.

The shapes of these minute pieces include dots, stripes, and rectangles, and the dots will be described below. However, the present invention is applicable to phosphor particles having any of the shapes described above. When the color cathode ray tube is operated, the electron beam passing through the hole in the shadow mask stimulates the phosphor dots, causing them to emit light.
The state of light emitted by these phosphor dots is important when evaluating the characteristics of color cathode ray tubes, especially when evaluating brightness or phosphor surface formation technology. In general, the phosphor dots in a color cathode ray tube are stimulated by the electron beam passing through the hole in the shadow mask, and do not emit light uniformly; in reality, the electron beam ejection hole in the electron gun is finite. , or due to mutual repulsion of electrons within the electron beam, the periphery of the electron beam passing through the shadow mask hole is blurred, and the phosphor dots may not emit light with uniform brightness.

Furthermore, a distribution of light emission occurs within the phosphor dots due to the arrangement of the phosphor particles within the phosphor dots, the small holes in the aluminum film, the base material on which the aluminum film is deposited, and the like. Therefore, when evaluating the brightness of the phosphor film in a color CRT, it is not possible to simply evaluate the brightness of the color CRT by dividing the brightness of the phosphor by the luminous area of the phosphor. Measuring the luminescence distribution of color cathode ray tubes is an important means of breaking down the brightness of color cathode ray tubes into factors related to design or phosphor film formation. As a method for measuring the luminescence distribution within a phosphor dot, a suspended microphotometer with a minute slit (a 10μ x 10μ slit is suitable for this purpose) on the imaging plane is used to mechanically measure the luminescence distribution within a phosphor dot. One possible method is to move it in front of the photometer and record the photometer output on a recorder.

However, considering the mechanical movement of the receiver and the response speed of the photometer, this method requires at least 10 seconds to scan one phosphor dot. Microscopic vibrations in the measuring instrument and color bra one tube operating system cause large errors. Another drawback is that it is not possible to monitor the location where the slit is scanned during measurement. There is also a method of using glass fiber instead of a slit,
The problems are the same as those of the above method. Therefore, the present invention has been made to solve the above-mentioned problems and to measure the luminescence distribution of minute parts.

In the present invention, as shown in FIG. 1, a magnified phosphor dot image is formed using a microscope on the light-receiving surface of an image pickup tube, etc., and this image is scanned to generate a serial electrical signal. By displaying an enlarged image above and inputting a serial signal into an oscilloscope to draw its waveform, the luminescence distribution of any cross section of the phosphor dot can be observed.

In the figure, d is a color cathode ray tube, and 9 is a signal processing section. When the present invention is actually used, a high-resolution vidicon camera e with a 10x objective lens is used as a light receiving section, and an enlarged phosphor dot image 1 formed on the vidicon light receiving surface is displayed on a monitor cathode ray tube f. displayed.

While looking at this cathode ray tube, we adjusted the pits, selected measurement points, and observed the landing state of the electron beam on the phosphor dot. The magnified image of the phosphor dots converted into an electrical serial signal by the vidicon camera is transmitted to the monitor cathode ray tube and then input to the vertical axis of the oscilloscope h. A horizontal synchronization signal was input. Oscilloscope horizontal axis scan 3msec/CT! If it is about L, it will look like Figure 2a.
A waveform as shown in is observed. This waveform shows a cross-section of the phosphor luminescence distribution seen from the direction of arrow a in Figure 1 on a monitor CRT. One scanning line is shown. If one of these scanning lines is taken out, the emission distribution in the cross section represented by scanning line Bc in FIG. 1 can be observed on the oscilloscope as shown in FIG. 2b. For this purpose, a delay circuit is used and the point J (j
The point corresponds to the scanning line Bc in Figure 1), and the horizontal synchronization of the oscilloscope was set to 0.4μSec/? This was done by expanding it to . In addition, waveforms were recorded using Polaroid photographs. Therefore, compared to the above-mentioned mechanical scanning method, this method requires a shorter scanning time, eliminates errors caused by vibration, and because it uses a CRT for monitoring, it is possible to check landing conditions, selected locations, pit adjustments, etc. There are advantages to doing so.

Moreover, as a light receiver, not only a vidicon camera but also a C. C. It is also possible to use a device in which the photoreceptor surface is not continuous but quantized, such as in a D camera.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a color cathode ray tube phosphor emission intensity distribution measuring device, Fig. 2a shows a serial signal waveform, and Fig. 2b shows a serial signal waveform.

Claims (1)

[Claims] 1. A microscope that magnifies the light-emitting phosphor particles on the fluorescent surface of a color cathode ray tube, and a camera equipped with an element that converts an optical image into an electrical signal on the imaging surface of the objective lens of the microscope is used as a light receiver, A serial electrical signal is extracted by scanning the image formed on the image, the signal is displayed as an enlarged image on a cathode ray tube screen, and an arbitrary part of the serial electrical signal is extracted and displayed as a signal waveform on an oscilloscope. It is equipped with a signal processing unit that calculates the luminescence intensity distribution within the luminous phosphor particles on the fluorescent surface of the color cathode ray tube.
A color cathode ray tube phosphor emission intensity distribution measuring device for observing and measuring a signal waveform on the oscilloscope.