JPS6168836A - Beam index type color cathode-ray tube - Google Patents

Abstract

PURPOSE:To make it possible to surely obtain an index signal by specifying application order of two kinds of photoindex signal luminous bodies. CONSTITUTION:Application is performed in such order that the intervals from a photoindex signal luminous body 9b having the short afterglow time 9b to the index signal luminous body 9a having the long afterglow time 9a may be shorter than those from the photoindex signal luminous body 9a having the long afterglow time to the photoindex signal luminous body having the short afterglow time in relation to the scanning direction. Thereby, as the luminous body 9a emits light after the light of the luminous body 9b is fully attenuated, AC components of two kinds of signals are enlarged thus being able to be surely detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the application sequence of optical index signal emitters in a beam index type color cathode ray tube.

FIG. 1 shows a conventional optical beam index type color cathode ray tube. 3G) in the figure, 1 is a valve,
2 is the funnel, 3 is the neck.

6 indicates a face plate. As is well known, in the beam index type color television, the electron beam 5 emitted by the Peng electron gun 4 is placed on the front side of the metal back 80.
A lighting window 1 in which the primary color phosphor 7 is made to emit light, and the original index signal light emitting member 9 on the back side thereof is also made to emit light, and the light index signal 10 generated here is transmitted to a part of the funnel.
In this method, a color image is reproduced by sequentially switching the three-part color signal applied to the cathode based on this signal. Note that 13 is an internal conductive film made of an aluminum vapor-deposited film, and the lighting window 11 is formed by omitting this internal conductive film only in that portion. Further, FIG. 2 is an enlarged view of the face plate portion of FIG. 1, and shows the arrangement relationship between the three primary color phosphors and the optical index signal light emitter. In the figure, one optical index signal emitter is provided for one set of three primary color phosphors of red, green, and evening. This shows the so-called 1/1 method, but in general, the n/m method (which has n optical index signal emitters for m sets of three primary color phosphors)
+n and n are integers).

Now, not only the 1/1 method shown in Figure 2, but also the n
When one type of optical index signal emitter is used in the / m method, the interval between each optical index signal emitter is constant. However, for example, even with the same 1/1 method, as shown in FIG. In order to avoid cross-modulation, which is a problem, when forming a 1/1 system using two types of optical index signal emitters 9a and 9b, the intervals between the respective optical index signal emitters are not constant, and the third As shown by A and B in the figure.

It can be both long and short. Normally, the afterglow times of the two types of optical index signal emitters are not the same, so as shown in Figure 3,
If the intervals between the respective optical index signal emitters are not constant, the order in which the two types of optical index signal emitters are applied will cause a difference in the output obtained from the photoelectric conversion element. For example, in FIG. If 9b is an optical index signal emitter with a long afterglow time, and 9b is an optical index signal emitter with a short afterglow time, then the output of the sensor that receives both the index lights from 9a and 9b will be the same as the optical component of the index signal. It becomes smaller.

An object of the present invention is to ensure that an index signal is obtained by devising the application order of the two types of optical index signal emitters when detecting light from at least two types of optical index signal emitters. It's about doing.

The key point of the present invention is that, in the horizontal scanning direction, the distance from the optical index signal emitter with a short afterglow time to the optical index signal emitter with a long afterglow time is The method is to apply the optical index signal emitters in an order in which the afterglow time is shorter than that of the optical index signal emitters having short afterglow times.

Hereinafter, the present invention will be explained in detail based on examples. usually,
P47 phosphor and P4 are used as optical index signal emitters.
Six phosphors were used, and the emission spectra of these phosphors are shown in FIG. 4, and the afterglow characteristics are shown in FIG. P4 as shown in Figure 5? Fluorescent 10% afterglow time is 8Qns
ec, the 10-chi afterglow time of P46 phosphor is 145ns
It is ec.

Now, when forming a 1/1 system using these two types of optical index light emitters 1, for example, Fig. 6 fa)
As shown in , if the distance from the P46 phosphor to the P47 phosphor in the horizontal scanning direction is shorter than that from the P47 phosphor to the P46 phosphor, the afterglow of each phosphor The optical index signals obtained by the characteristics are as shown in the figure (Fig. 2), and the alternating current components of each signal become small. The light body emits light.

Therefore, FIG. 7(a) shows an embodiment of the present invention, but as shown in this figure, the order of application of the P47 phosphor and the PAS phosphor is reversed from that of FIG. 6(a). The coating is performed in the order in which the distance from the P47 phosphor to the P46 phosphor is shorter than that from the P46 phosphor to the P47 phosphor in the horizontal scanning direction. In this case, the P46 phosphor emits light after the light from the P47 phosphor has sufficiently attenuated.
As shown in the figure, the alternating current components of the two types of signals are thick (and can be detected reliably).

Here, we have described the case of using two types of optical index signal emitters, the P47 phosphor and the P46 phosphor, but the point is that the optical index signal emitter has a short afterglow time in the scanning direction. The interval from the light index signal light emitter with the longest afterglow time to the light index signal light emitter with the short afterglow time is shorter than that from the light index signal light emitter with the long afterglow time to the light index signal light emitter with the short afterglow time. It is fine to apply it easily.

Also, although only the 1/10,000 system has been described here, for example, the 1/3 system would be as shown in Figure 8.

Furthermore, it goes without saying that the same applies when three or more types of optical index signal light emitters are used.

According to the present invention, when using two or more types of optical index signal light emitters with different afterglow times, it becomes possible to reliably detect the signal n, respectively.

[Brief explanation of the drawing]

Figure 1 is a side cross-sectional view showing an example of a conventional index-type color cathode ray tube, Figures 2 and 3 are views showing its face plate, and Figure 4 is a relative view of the P46 phosphor and P47 phosphor. Figure 6 shows the emission spectrum, WJ5 shows the afterglow characteristics, Figure 6 shows the structure of the face plate when using two types of original index signal light emitters,
This figure is a diagram showing one embodiment of the present invention in contrast to FIG. 6, and FIG. 8 is a structural diagram of a face plate showing another embodiment of the present invention. 2...Funnel 4...Electron gun 8...Metal back 10...Original index signal 12...Photoelectric conversion element'2 1 Product 7 Z Figure 7 et al. -) Figure 74 Figure '300 4/ )6 svo 1)6
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Claims (1)

[Claims] In an optical beam index type cathode ray tube, which has at least a face plate coated with one or more types of optical index signal emitters at different intervals and an electron gun that emits an electron beam, the afterglow time is determined in the horizontal scanning direction. The distance from the short optical index signal emitter to the optical index signal emitter with long afterglow time is greater than that from the optical index signal emitter with long afterglow time to the optical index signal emitter with short afterglow time. A beam index type color cathode ray tube characterized in that optical index signal emitters are applied in decreasing order.