JPS5843858B2 - color ink color ink - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a color cathode ray tube that is suitable for application to a color image projection device that uses a cathode ray tube and can obtain a color image of a dog screen from the playback screen of the cathode ray tube. Related to equipment.

Prior to explaining the present invention, the above-mentioned color image projection device will be explained. As this color image projection device,
For example, as shown in FIG. 1, a single color cathode ray tube 1 capable of obtaining a normal color reproduction image is used, and a color reproduction image 2 reproduced on its fluorescent surface is transmitted to a reflecting mirror 3 and a projection lens system 4. Although not shown, there is a device configured to project onto a projection screen.

Alternatively, as shown in FIG. 2, images 2 of red, green, and blue, respectively.
R, 2G and 2B - each monochromatic 3 that reproduces only the color
Using two cathode ray tubes II (, , IG, IB), each red, green and blue image 1, 2 by each cathode ray tube IR, , IG, IB is used.
G and 2B are enlarged by projection lens systems 4R, 4G and 4B and superimposed on each other on a projection screen (not shown), thus obtaining a color projected image in which images of each color are combined. There is something.

The single-tube color image projection device shown in FIG. In the color image projection apparatus having the three-tube configuration shown in the figure, each color is reproduced and synthesized by the respective cathode ray tubes IR, 1G, and IB, so in principle, the color image projection apparatus shown in FIG. Although the brightness is three times as bright as that of the conventional color image projection device, the disadvantage is that the device is significantly larger and more expensive.

In order to avoid such drawbacks, the present applicant proposed a color image projection device having a two-tube configuration.

As shown in FIG. 3, this color image projection apparatus includes a first cathode ray tube 1 for producing a monochromatic reproduced image, for example, a red reproduced image.
2 with each component of R and two other colors, e.g. blue and green.
A second cathode ray tube IBG that reproduces an image 2BG in primary colors
For example, the dichroic mirror 7 reflects the optical image of the reproduced image 2R of the first cathode ray tube 1R, and transmits the blue and green reproduced images 2BG obtained by the second cathode ray tube IBG. 2R and 2
The optical images by 8G are superimposed, and these images 2R and 2B are
The optical image obtained by G is enlarged by a projection lens system 4 and projected onto a screen (not shown).

With such a configuration, the image reproduced by the single-tube cathode ray tube 1R can have sufficient brightness because it is monochromatic, and the other two colors can also be reproduced with sufficient brightness.
Since it is constructed using a cathode ray tube IBG having a color tube construction, the brightness can be improved more than in the case of the three-color tube construction shown in FIG.

In other words, in a normal three-color cathode ray tube, the aperture ratio of the electrode for determining the electron beam arrival position, such as the slit in the aperture grill, is limited to 20% at most, and the remaining 80% of the electrons are absorbed by the aperture grill itself. Upon impact, the energy is converted into heat and lost.

In comparison, according to the two-color color cathode ray tube IBG, the opening ratio of the aperture grill is 2 when the three colors are used.
Even if you simply convert the aperture ratio of 0% to the aperture ratio for two colors, it will be about 30%, which is 1.5 times the aperture ratio for three colors.
The brightness will be improved accordingly.

However, the present invention provides a multi-color color cathode ray tube whose brightness is further improved in such a color image projection apparatus.

In other words, the aperture ratio of the electrode for determining the electron beam arrival position in a normal color cathode ray tube is the number of electron beams when the pitch of the through-hole part, for example, adjacent slits, is 1.00%. In other words, the ratio divided by the number of colors in the phosphor (for example, 3 for a three-color cathode ray tube) is 100 3% for a three-color tube, and 7% for a two-color tube. ) The aperture ratio should be selected as below, and in consideration of the landing margin, for example, in the case of a three-primary color cathode ray tube, the aperture ratio should be selected as 20%. There is.

Therefore, when configuring a two-color color cathode ray tube, the aperture ratio of the electrode for determining the electron beam arrival position is 100%-50.
% or less, for example 30%? In particular, in the present invention, in this two-color cathode ray tube, (1) the aperture ratio of the electrode for determining the electron beam arrival position;

Set to more than 100 3 3 (i.e. %) and less than 7 (i.e. 4 x 100%).

On the other hand, during the application of the phosphors of each color constituting the phosphor surface, the widths of the two are selected to be approximately equal to each other.

Next, an example of a color cathode ray tube device according to the present invention will be described with reference to FIGS. 4 and 5. In this example, a color image using two primary colors of blue and green is reproduced. It is.

In the present invention, as shown in FIG. 4, an electron gun G is provided that emits two electron beams, an electron beam BB corresponding to blue and an electron beam BG corresponding to green. The emitted electron beams BB and BG are connected to an electrode for determining the electron beam arrival position, such as a slit S of an aperture grill AG.
Landing scanning is performed on the fluorescent surface S through L.

For example, the electron gun G has two cathodes KB and KG.
are arranged in the same horizontal plane on both sides of the tube axis, and a first grid Gl (control electrode) and a second grid G2 (acceleration electrode) are commonly connected to these cathodes KB and KG.
Similarly, for example, the third grid G (first anode), fourth grid G4 (focusing type pole), and fifth grid G5 (second anode) constituting a common unipotential main electron lens are coaxially arranged. After the fifth grid G5,
Convergence means C are arranged.

The convergence means C includes, for example, a deflection electrode plate C1 disposed at the center and outer deflection electrode plates C2 disposed on both sides thereof.
and C3, and a convergence voltage is applied between the deflection electrode plate C4 at the center and the deflection electrode plates C2 and C3 on both sides.

Electron beam B emitted from cathodes KB and KG, respectively
B and B intersect with each other approximately at the center of the main electron lens made up of grids 03 to G5, and are spaced apart from each other to connect to the deflection electrode plate C1 at the center of the convergence means C and both sides thereof. The beams enter between the electrode plates C2 and C3, respectively, where they are deflected and converged.

The phosphor surface S is arranged in such a way that the blue and green phosphor stripes B and G extend in a direction substantially orthogonal to the arrangement direction of the beams BB and BG, for example, in a vertical direction, and each width is equal to that of the adjacent one. 100% gold mine of matching phosphor stripes B and G
When , the widths are selected to be equal to each other, which is 50% of each half.

On the other hand, the aperture ratio of the slit SL of the aperture grill AG, which serves as the electrode for determining the electron beam arrival position, is selected to be more than 24 or less.

For example, when the pitch between adjacent lines 1-8L, that is, the center distance between adjacent lines 1-8L is taken as 100%, the area F1 blocked by the aperture grille AG is set to 33%, and the remaining aperture ratio is set to 67%.

In this way, the Surin 1-
Each beam B landing on the fluorescent surface S through 8L
As mentioned above, when the sum of the widths of a pair of adjacent phosphors B and G on the phosphor surface S is set to 1, the landing spots SPB and SPQ of B and BG exceed the above and below ヾ, for example, 67 4%.

Therefore, each beam spot SPB and SPG is selected more closely than Wp in the cauldron of each phosphor stripe B and G, and in the normal landing state of spots SPB and SPG, each side of each spot SPB and S I) Make it protrude from both sides of the phosphors B and G.

In other words, on both sides of each phosphor stripe B and G, two electron beams are made to land in a superimposed manner.

Therefore, in this part, a color mixture in which blue and green signals are mixed occurs, but twice the brightness of each is obtained.

The reason why the aperture ratio of the electrode for determining the electron beam arrival position, that is, the sulin t-8L of the aperture grille AG, is selected to be less than □ is that if it exceeds this, color mixture becomes an eyesore.

As described above, according to the configuration of the present invention, a portion of the beam corresponding to the other color lands on both sides of the phosphor of each color. The projected image is a dog, and in this case, brightness is more impressive to the human eye than color fidelity, especially when a two-color tube configuration with a combination of blue and green is used. Since the mixture of blue and green colors is less likely to be an eyesore to human vision, the mixture of the two colors does not pose much of a problem, and improving the brightness is a major benefit.

The above example of the present invention is a case where one beam, that is, two beams are scanned corresponding to each color, but for example, if a three-beam system is used, two of the beams are scanned by one It is also possible to land on a phosphor, for example a green phosphor, so that the beam lands twice with respect to the green phosphor.

That is, even though the blue and green phosphor stripes B and G are arranged alternately as explained in FIG. 5, for example, the phosphor stripes of one color, for example, the blue phosphor The stripe B is arranged so as to face the slit SL of the aperture grille AG, and among the three beams arranged in-line in the direction intersecting the extension direction of the phosphor stripe and the slit SL, the central beam is located at the slit SL. The two beams on both sides are regulated by the blue phosphor stripe B and the green phosphor stripe G on both sides. -8L, and land on the green phosphor stripes G on both sides and across the width of a portion of the blue phosphor strips B on both sides.

Therefore, in this case, the green phosphor is landed twice through the adjacent Surins 1-8L.

Furthermore, in the above example, the present invention is applied to a two-color cathode ray tube using a combination of blue and green, but the present invention may also be applied to a color cathode ray tube using two different primary colors. You can also do it.

The case where an aperture grille AG having a slit SL is used as an electrode for determining the electron beam arrival position has been described, but a mask having slots, circular holes, etc. can also be used as the electrode, and the phosphor can be adjusted accordingly. The arrangement pattern is not limited to stripes, but may take various other patterns.

Further, it is obvious that the electron gun G is not limited to a double-beam single electron gun, but can be modified in various ways, such as having a multiple electron gun configuration.

[Brief explanation of the drawing]

1 to 3 are layout diagrams of a color image projection device used to explain the present invention, FIG. 4 is a configuration diagram showing an example of a color cathode ray tube device according to the present invention, and FIG. 5 is a layout diagram of its main parts. FIG. IBG is a two-color cathode ray tube according to the present invention, 2BG is its reproduced image, G is an electron gun, AG is an aperture grill as an electrode for determining the electron beam arrival position, SL is its slit, S is a fluorescent surface, B and G are the front and green fluorophores, respectively.

Claims (1)

[Scope of Claims] It has a fluorescent surface formed by sequentially painting phosphors of 12 colors, and the ratio of the widths of the phosphors of each color on the fluorescent surface is selected to be approximately equal to each other. A color cathode ray tube device in which the aperture ratio of the electrode for determining the electron beam arrival position, which is arranged opposite to the fluorescent surface, is greater than 100 and less than or equal to 7.