JPS6372278A - Flat color picture reproducing device - Google Patents

Abstract

PURPOSE:To reproduce a stable color picture by extracting a light index signal from a fluorescent face of a flat index or the like over the entire face, sending it to the end of an optical waveguide and leading it to a photodetector. CONSTITUTION:An electron beam 5 radiated from an electron gun 4 is deflected by a deflection yoke 6 and made incident in the fluorescent screen 3. A visual light 7 radiated from a 3-primary color fluorescent stripe and an optical index signal 7' stimulated from the index fluorescent substance transmit through a face plate 1' and are radiated externally. Moreover, the light index signal 7' is made incident from the light intake of the optical waveguide 8 and scattered while being covnerged on the rugged face. Then the scattered light index signal advances the guide path 8 while repeating reflection and is led to the end 80. The photodetector 9 is arranged opposed to the end 80 of the light guide path 8 and since the light guide path 8 is arranged to surround the fluorescent screen, the light index signal is collected stably over the entire screen.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a beam index type flat color image reproducing device that efficiently collects light from the entire surface of a phosphor screen using an optical index signal.

[Conventional technology]

In a conventional cathode ray tube, an electron gun and an electron beam deflection device are arranged on an axis substantially perpendicular to a phosphor screen. This shortens the depth of the cathode ray tube.

As an example of color TV receivers using flat beam index tubes, IE.
E.E., I.C.C.E. 85, pp. 182-183 (1985) (IEEE, ICCE8
5. P182-183 (1985).

FIG. 11 shows an outline of the above conventional example. FIG. 12 is a structural diagram of the phosphor screen of the conventional flat beam index tube. A conductive film 2' made of graphite is formed on the inner surface of the glass container 1, a part of the conductive film is removed and an index phosphor stripe I is applied, and then three primary color phosphor stripes are applied on the conductive film. A protective film 3' is coated on the phosphor. The amount of light index input 7' from the index phosphor I is determined by the light condensing plate 2 provided on the outside of the glass container 1.
0 and converted into an index signal by the photodetector 9 provided on the end face of the light condensing plate.

The index signal and the video signal supplied to the terminal 11 are processed by the index signal processing circuit 10 to form a drive signal that causes a desired color phosphor to emit light with a desired amount of electron beam. The drive signal is supplied to the electron gun 4 to reproduce a color image with the correct hue.

[Problem that the invention seeks to solve]

The above conventional technology uses two or more types of index phosphors with different emission spectrum distributions, but does not take into consideration the stable and reliable illumination of the two or more types of optical index signals over the entire surface of the phosphor screen, resulting in color reproduction. There was a problem with sexual instability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a beam index type flat color image reproducing device that stabilizes color reproducibility by stably illuminating one type of optical index signal or two or more types of optical index signals over the entire surface of a phosphor screen. It's about doing.

(Means for solving the problem) The above purpose is to scatter and reflect the optical index signal incident on the inner surface of the glass container of the flat index tube through the light introduction section on the side of the light guide provided on the outside of the glass container. This is achieved by transmitting the light to the end while guiding it to the light receiving surface of the photodetector.

[Effect]

The light guide path captures the optical index signal from the phosphor screen of the flat index tube over the entire surface, transmits the optical index signal to the end of the light guide path, and guides it to the light receiving surface of the photodetector, so the optical index signal is transmitted over the entire surface of the phosphor screen. Since the signal can be detected, stable color images can be reproduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a perspective view of a flat beam index tube used in the present invention, FIG. 2 is a sectional view taken along the line II' in FIG. 1, and FIG. 3 is a sectional view taken along the line nn' in FIG. On the inner surface of the flat glass container 1, red (R) and green (G) are coated on a metal back film 2 in which aluminum or the like is deposited.

A 3M color phosphor stripe that emits blue (B) and, for example, an invisible index phosphor stripe ■ whose emission peak is in the ultraviolet region are applied in the same manner as the 3M color phosphor stripe in a specific arrangement relationship. The optical index signal 7' is emitted to the outside of the face plate 1'.

In Figure 1, the U-shaped light guide path is connected to face plate 1'.
It is installed outside. The light guide path is an optical fiber having the cross-sectional structure shown in FIG. An uneven surface 15 is formed along the longitudinal direction on a part of the outer circumferential surface of the high refractive index core 12 made of plastic or glass, and furthermore, the outer circumferential surface except for the part opposite to the uneven surface 15 is formed. A cladding 13 having a lower refractive index than the core 12 is provided. A portion of the cladding 13 is removed from a portion of the outer peripheral surface of the core 12 that faces the uneven surface 15, and this portion serves as a light introduction portion 14 of the light guide path.

An electron beam 5 emitted from the electron gun 4 is deflected by a deflection yoke 6 and enters the phosphor screen 3.

Second. As shown in FIG. 3, the visible light 7 emitted from the three primary color phosphor stripes and the optical index signal 7' emitted from the index phosphor stripe pass through the face plate 1' and are emitted to the outside. The optical index signal 7' enters from the light introducing section 14 at the end of the light guide path, is refracted at the incident section, converges on the uneven surface 15 located at a position opposite to the incident section, and is scattered at this section. The scattered optical index signal is transmitted to the light introducing portion 14 of the inner peripheral surface of the core 12 . Uneven surface 1
The photodetector 9 is disposed opposite the end 811 of the light guide and is transmitted to the end 811 of the light guide. Since the light guide path is arranged so as to almost surround the fluorescent screen of the index tube, the optical index signal can be stably illuminated over the entire surface of the screen.

The optical index signal collected by the light guide bar is sent to the photodetector 9.
is photoelectrically converted into an index signal. The video signal supplied to the terminal 11 and the index signal are supplied to the index signal processing circuit 1o, and signal processing is performed to form a drive signal for the flat index tube, and a desired color phosphor stripe is directed to a desired electron beam. By emitting light at the correct amount, a color image with the correct hue is reproduced.

FIG. 5 shows another specific example of the light guide path. In the light guide path l', a light-diffusion material film 16 such as magnesium oxide is formed along the longitudinal direction on a part of the outer peripheral surface of the core 12.
Further, on the outside thereof, a metal film 13 such as an aluminum film is deposited on the entire surface except for the portion facing the material film 16. The part where the metal film 13 is not deposited is the light introduction part 14
A protective film 17 is applied to the outside of the metal film 13 to mechanically protect the metal film.

FIG. 6 shows another embodiment of the present invention, and FIG. 7 shows the structure of the phosphor screen. This stabilizes the operation of a beam index type color image reproducing device using two types of index phosphors already disclosed by the present inventors. As shown in 1
For example, ■ is invisible YA with a luminescence peak in the ultraviolet region.
IO, :Ce phosphor, I2 is Y, Al, :Ce or Y3A13G42 whose emission spectrum is similar to that of the total phosphor.
:Using Ce phosphor.

The first index phosphor stripe I□ is applied between the B and R phosphor stripes, and the second index phosphor is mixed with the G phosphor and applied as a G chromatic photon and second index phosphor stripe I2. This is what I did. In addition(
a+12) The reason why the phosphor stripe width is made wider than the phosphor stripe widths of other colors is to compensate for the decrease in the amount of light emitted by the total luminescent material and obtain a white color with an appropriate white balance. Each index phosphor stripe I to one set of color light tripes 1. A 1/1 method with one set of is shown. Index phosphor 11. Assuming that the phase of a pair of RGB color phosphor stripes is 360 degrees, I2 has a phase relationship of 180 degrees to each other, so one index signal can be obtained by inverting the phase of one index signal and then adding it. Can be done. The index signal obtained in this way can solve the problem of the conventional 1/1 method in which the index signal cannot be obtained when reproducing a specific hue, and it is also stable because the phase error of the index signal can be reduced. Color images with different hues can be reproduced.

When using the two types of index phosphors mentioned above, it is necessary to collect each optical index signal independently, so as shown in FIG. , 9' are provided with optical filters 18, 18' each having transmittance characteristics as shown by dotted lines in FIG.

The operation after collecting two types of optical index signals independently, inverting one of the index signals, and adding them is the same as that in the first embodiment, so a description thereof will be omitted.

In the above embodiments, the three primary color phosphor stripes and the index phosphor stripes are formed in the same layer.

Although the description has been made using a front-lighting type flat beam index tube in which the fluorescent screen is arranged diagonally with respect to the electron gun, the present invention is not limited to this. For example, as shown in FIG. The electron beam 5 emitted from the electron gun 4, which is arranged in parallel, is deflected by the deflection yoke 6, and then transferred to the sub-deflection plate 1.
Due to the electrostatic field formed in the space between the phosphor screen 9 and the phosphor screen 3, the beam is bent at a nearly right angle and enters the phosphor screen, and the visible light 7 from the three primary color phosphor stripes is emitted in front of the face plate 1'. It is also possible to apply it to index tubes. FIG. 10 is a diagram of the structure of the phosphor screen.

The index phosphor ■ is 3N through the metal back film 2.
The optical index signal 7 is coated on the side opposite to the color phosphor stripe and is excited and emitted by the electron beam 5.
' is released in the direction of the glass container 1. A light guide is installed outside the glass container 1, and it is possible to provide stable light index signals over the entire surface of the phosphor screen.

〔Effect of the invention〕

According to the present invention, the optical index signal from the flat beam index tube can be stably and reliably illuminated over the entire surface of the phosphor screen using the light guide path, and it can also be applied to a system using two types of index phosphors. The operation of the beam index type flat color image reproducing device can be stabilized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II' in FIG. 1, FIG. 3 is a sectional view taken along the line ■-II' in FIG. 1, and FIG. FIG. 5 is a sectional view of a light guide path, and FIG. 6 is a perspective view showing another embodiment of the present invention. Figure 7 is a diagram of the structure of the phosphor screen, Figure 8 is a diagram of the emission spectrum distribution of the index phosphor and the spectral characteristics of the optical filter.
9 and 10 are cross-sectional views and phosphor screen structure diagrams showing other embodiments of the present invention, FIG. 11 is a plan view and cross-sectional view of a conventional flat beam index tube, and FIG. 12 is a conventional flat beam index tube. FIG. 3 is a structural diagram of a phosphor screen of an index tube. 1... Flat glass container, 3... Fluorescent screen, 4... Electron gun. 5...Electron beam, 6...Deflection yoke, 7...-Visible light. 9... Photodetector, 12... Core, 13...-rod,
14... Light introduction part, 18.18'... Optical filter. 1st concave T' kudzu 2 ROKAZUHIKU 4 figure S 6 yen/l/ 72nd 8th 9th concave 7θ figure Taku 1/Country (2) (h) 72 figure

Claims (1)

[Claims] 1. Index fluorescence in a flat beam index tube in which an electron gun and an electron beam deflection means are arranged at an angle other than perpendicular to a phosphor screen consisting of three primary color phosphor stripes of red, green, and blue and an index phosphor stripe. The optical index signal from the body stripe enters the light guide path made of a transparent material with a high refractive index and is placed outside the flat glass container. 1. A flat color image reproducing device characterized in that the optical index signal is detected by a photodetector provided opposite to the end of the light guide path.