PL92985B1 - - Google Patents

Description

The patent description was published: October 31, 1977 MKP HOlj 29/32 Int. Cl.2 H01J 29/32 READING ROOM Palentowago office fitefcm tuaxm «\ 'tt Li * mj Inventor: Patent holder: Tokyo Shibaura Electric CO, LTD, Sainai-ku, Kawasaki-shi (Japan) A method of producing a strip screen in color production picture tubes The invention relates to a method of making the belt screen on the front panel of the colored ki¬ a telescope fitted in a line electron launchers.

An equipped color picture tube is known in one line of electron depositories, to emit a central electric beam a new one and a pair of side electron beams.

Such a color picture tube has a lumines- price 3 with emitting blue, green ny and red color strips of phosphor 4B, 4G and 4R formed on the inner surface of the disc front panel 2, as well as light-absorbing stripes 5 formed between the phosphor strips, as is the case has been shown in Fig. 1 in the accompanying drawing.

Phosphor strips and light absorbing strips lo are formed in the direction perpendicular to the plane on which the launchers are placed electrons 6B, 6G and 6R forming set in one line a team of launchers. Center discharge 6G electrons are placed on the lamp axis, and a pair of side electron guns 6B and 6R it is arranged symmetrically with respect to the center 6G electron launcher. Between the ejection electrons 6B, 6G and 6R and the front plate 2 there is a shadow mask 7 fitted to front plate 2 and having a large number of slotted 8 holes arranged along the length of the strip phosphor blocks with bridges 9 left on by the mixture between slotted openings. Slotted holes 8 are formed substantially over the entire surface shadow mask 7.

If in the described cathode ray tube 1 wide light absorbing bones 5 and a belt phosphor 4B, 4G and 4R, which are strongly alloyed and influence the brightness of the luminescent screen, it will not be performed with the desired equation Nowadays on the entire surface of the screen, it is half color reproducibility will be significantly impaired white, even with each wiring harness the new one will correctly fall through the mask shade 7 on the corresponding phosphor strip.

When the screen 3 of the cathode ray tube is formed enter 1 then light-absorbing stripes 5 two are usually cut before forming the orifice strips minophore. Because the width of the phosphor strips in contact with the faceplate is defined by the width of the light-absorbing stripes, it the brightness of the image displayed on the screen is largely controlled by a wide range of a bone of light-absorbing stripes. As a consequence It is desirable for the width to absorb the light of the stripes was very carefully molded over the entire surface of the screen.

When a color picture tube screen is formed pu was then widely used there is a photographic process that employs such devices non-illuminating 10, as shown in 2, this is the forehead-plate assembly input 2 having formed on its inner 92 98 592 985 4 the surface of the photosensitive layer 11, and from the mask the shade 7 fixed in an approximate position parallel to the front plate, to be placed on the illuminating device 10.

Inner face plate 2 na¬ is illuminated through the corrective lens 13 and Place the correction filter 14 through the light source 12 connected at the bottom of the lighting device 10 in half position corresponding to the center of the bond deflection electron ki. Correction lens 13 necessary is to provide optical correction, thanks which is caused by the optical path of the light corresponds to the electron beam path, while when a correction filter needs to be adjusted the distribution of light on; the inside surface of the liquid you forehead.

Then ^ * when the luminescent screen is formed- for a cathode ray tube lamp equipped with an adjustable in one line the set of launchers, because the middle A conical electron gun is located behind the gate substantially coaxial with the lamp axis, as optical correction associated with the central electrode harness only the radius correction is necessary shaft with deflection characteristics according to which means of deflecting the electrode beam the new one moves towards the screen along with an increasing swing angle.

As an optical correction for a pair of side vents is necessary in addition to the correction axis, ungroup correction, with which the center displacement is compensated for deflection perpendicular to the lamp axis due to the presence of a converging magnetic field dynamic load. For this reason, in order to form luminescent screen. cathode ray tube ditch fitted in one line launchers necessary are usually two types of s¬ correction coils, one for the center beam and one for a pair of side harnesses. This means that in the production process of cathode ray tubes at least two separate devices are required illuminating them.

An illuminating device used for production of light-absorbing stripes, specification sliding those areas that correspond to the stripes light-emitting phosphor upon reaching them in the middle electron beam, has a source lo of light located on the axis of the lamp, that is, on central axis of the front plate and correction filter and a corrective lens for radial correction in relation to the center beam. On the other hand again hand exposure device used in the production of light-absorbing strips which define those regions that correspond to the belt light emitting phosphor cells upon arrival to them pairs of side electron beams, po a light source located away from lamp axis so that it corresponds to the side harness © once a correction filter and a correction lens to radial correction and ungrouping correction in relation to the side harnesses.

As a lighting device for pairs of beams one type may be used an illuminating device capable of relative it rotates the optical system, that is, the source light, corrective lens and corrective filter it, and the lighting system (mask unit front end) one to the other through the angle of 180 ° around the lamp axis. The width of the absorbing light stripes - which (Determine the width of the space than between the light-absorbing stripes and the city between which the strips are to be formed later phosphor - is determined by the amount of light, exposure time, light distribution, etc.

Only the amount of light and the exposure time can be carefully inspected even when separate lighting devices are used jace. It is very difficult to achieve this completely the same light transmission characteristics in the used for correction filters in separate lighting devices.

Therefore, in the conventional method of transferring blasting between light-absorbing stripes in which phosphor strips are to be formed emitting light under the influence of the central beam electrons have an undesirable tendency to occupy speaking of the width different from the space between light-absorbing stripes in which they have be formed strips of phosphor emitting light under the influence of a pair of side electron beams out. This again adversely affects the reproducibility The white color of the reproduced image.

It is an object of the invention to overcome the above failures convenience and the purpose of the present invention is obtaining a method for producing a stripped screen nu on the inner surface of the faceplate, in the manufacture of color picture tubes includes a team placed in one line launcher for emitting a central electro beam a new and a pair of side electron beams and face plate having phosphor strips formed on its inner surface in which it In this way, the width of the phosphor strips is determined by the brightness of the reproduced image is * o matched with the desired balance all over face plate surface.

The method of output according to the present invention the way of exposure to the strip screen a linear light source through a shadow mask 45 and a corrective lens located between the ruler source of light and the shadow mask character is characterized by the fact that the lens is corrective and linear Light sources are used at each stage making a strip screen, the being 50 relative azimuth of corrective lens between with a stage of illumination corresponding to the said the central beam, and the stages of illumination correspond to giving the aforementioned side bundles differences at an angle of 90 °, while a linear light source 55 whose direction coincides with the direction of the strip on the screen moves to the position corresponding to each electron beam at each stage of illumination.

The invention will be explained more slowly See the accompanying drawing in which fig. 1 shows a partial perspective view cut, showing a color picture tube fitted w three electric launchers aligned in one line of thrones, fig. 2 - cross-section of the irradiating device 65 used in the formation of luminescent-5 92 985 6 screen of the color picture tube, Figs. 3A-3H show the stages of luminescent formation of the screen, Figs. 4A-1 to 4A-3> - top view and projection you side to explain in line with it Another invention of the method of irradiating steam side lashings, Figs. 4B-1 to 4B-3 - view top and side views to explain the problem central beam, fig. 5-1 to 5- —3 - top view and side views for an explanation of how to illuminate the beam in the center a, Figs. 6-1 to 6-3 are plan views, and corrective lens cuts used in the method of lighting according to the invention.

First, the method of forming will be explained luminescent screen, then way irradiation.

As shown in Fig. 3A applied first is on the inner face of the face plate 2 photosensitive layer 20 such as polyvinyl alcohol for example, containing ammonium dichromate you. Next, Fig. 3B, inner surface the face plate 2 is illuminated by a light source 21 through the shadow mask 7. As a light source a linear light source is used so that produce light absorbing strips 5 without switching rival parts corresponding to the bridges 9 provided between the holes 8 of the mask. Na¬ the illumination is performed one time in succession (three times in all), each time the light source is placed in the correct position representing the measure of the deviation of each bundle electron. When irradiation is made according to the conventional method, it is one device the irradiation is used for the middle electron beam while the other is used for pairs of side harnesses.

After the end of illumination, the mask 7 is removed it is from the front panel 2. Polyalcohol layer wi¬ nylon is induced, and unlit steam the tie layers of polyvinyl alcohol are removed, to make strips of polyvinyl alcohol 22, as shown in Fig. 3C, where the polyvinyl alcohol strips 22 are applied longitudinally, in the direction perpendicular to the surface no paper.

As shown in Fig. 3D, on the inside the surface of the face plate is marked with a light-absorbing layer 23, such as a pigment graphite. 22 polyvinyl alcohol strips are dissolved for example with a solution hydrogen peroxide and then strips of polyalcohol vinyl 22 and light-absorbing parts material 23 covering these polyalcohol strips vinyl sheets are rinsed with hot water.

As a result, absorbents are formed jace light strips 5 as it is depicted on 3E, with lots 22 of polyvinyl alcohol strips left as spaces of 24 months between light-absorbing stripes. Next a layer 25 of lumino suspension is applied Phosphorus having green phosphor particles powdered in a bichromate polyalcohol solution a vinyl alcohol as shown in Fig 3F.

In turn (Fig. 3G) using a light source 26 positioned at the center of the center of the electron beam which strikes the stripes of the green luminous nofor, light is projected through the mask 7 on the inner surface of the face plate 2. After mask 7 is removed from the plate front panel 2 is exposed to development Niu and the non-illuminated parts are from the front panel removed, thus creating an interim specific light-absorbing stripes, a belt ki 4G green phosphor as it is shown in Fig. 3H.

Same processes as for making the strips of the green phosphor are repeated over the formation strips of blue phosphor and strips red phosphor.

In the above-described method of forming a strip light absorbing screen, nano stripes They are done before applying the phosphor strips.

The reverse process is also possible. However. applying the light absorbing agents is preferable strips before applying the phosphor strips, because the edges that absorb light graze 3F may be made more evenly.

In the described method, slant when applied luminous strips and strips of phosphor two separate lighting devices are used, as in the known case techniques. Although in this case it may be this one illuminating device is taking under pay attention to the production capacity of cathode ray tubes the use of two lighting devices is recommended jacych. Then when the light-absorbing stripes turn on are worn first, the width of the areas emit a- light (the width of the parts touching each other from the forehead) of the phosphor strips determined is given by the width of the space between the stripes light-absorbing and therefore striped The phosphor may have its edges superimposed * «For light-absorbing stripes. This means that six The length of the phosphor strips need not be so good neatly kept, like the width of the stripes absorbing the light.

The method of illumination used in the 45 light-absorbing strips are like are shown in Figs. 4A and 4B in that they have a line the light source 21 is placed so that his the direction coincides with the direction of the bars that are to be created on the screen, whereby A linear light source 21 is used to prevent it the appearance of the shadow of the shadow mask bridges 7 on the screen and deposition of the phosphor material in the form of stripes on the faceplate 2. As a filter a corrective one may be used that has such 55 same light transmission characteristics as conventional correction filters. E.g preferably the correction filter has a conversion factor wearing light, radially graduated, so that the transfer factor increases towards 80 peripheral parts of the filter.

For a pair of side electron beams, from corrective lens 28 is required to have the ability of radial correction and reconstruction composing. However, since the corrective lens 95 na is used in the application of absorbers 92 985 '8 light of stripes extending in the direction of the straight to the plane on which they are located They're electron launchers don't need to be capable displacement correction in the longitudinal direction cut these stripes, so the radius correction component nowa 31 and the ungroup correction component 33 corrective lens 28 are suitably formed symmetrically about axis 32 as shown in Figures 6-1 to 6-3. In practice, a stopper lens however, it may have a small component of the horse an ungrouping reaction formed in the direction of Y — Y, perpendicular to the X — X direction in which the ungroup correction component is formed cej 33.

At the stage of illumination to be created light absorbing matching stripes one of the side bundles, corrective lens it is positioned as shown in Figures 4A-1 to 4A-3, so that the regrouping correction component junction forming the X-X direction or axis of symmetry 32 is aligned with the plane of the switch in one line of three bundles. Source light 21 is placed in the position corresponding to giving one of the side bundles. When light-absorbing stripes are created beam on the other side, optical system comprising a light source 21 and a stopper lens filter 28 and the correction filter 29 is turned to a hundred to the face plate 2 and mask 7 with a 180 ° angle around the center axis 16 of the faceplate 2 like this arrow 30 is shown in Figs. 4A-1. As a consequence light source 21 moves its position to the position corresponding to the bundle on the other side. Perhaps rotated in this case also 180 ° to the optical system faceplate - mask complex 7.

When light-absorbing stripes are applied corresponding to the middle lane, then the system optical is rotated from position for one link 90 ° angle relative to the front panel 2 and masks 7 as shown in Figs. 4B-1 to 4b — 3, the light source is rotated, it is still only angle of 90 °, as a result of which the light source 21 z condition placed in the corresponding position the center loom as shown at broken line help. However, the location the light source 21 is not symmetrical with respect center of the front panel and it is likely that stripes will gradually change their width from one end to the other. Therefore, also beneficial there is a shift of the light source towards the belt as shown by arrow 35 in Figs. 4B-1.

At the stage of illumination corresponding to the beam the middle is as shown in 5-1, rotation of the face plate 2 and mask 7 at 90 ° angle from the relative position they occupied face plate 2, mask 7 and light source 21 at the stage of illumination corresponding to the beams side, and also turning the light source 21 90 ° around its axis 36. Favorable relationship position between the optical system and the unit lem forehead - mask are obtained also and when the corrective lens 28 is not becomes rotated 90 ° about axis 16, and the source the light 21 is displaced towards the center axis front panel 16 2.

According to the invention, when poisons are formed, light-absorbing strips corresponding to the bundle median, the axis of symmetry of the corrective lens is positioned perpendicular to the plane placed on one line of three bundles. No this poses no problem as it absorbs The luminous stripes only require accuracy in terms of width, and they do not require any depth at all clarity as to length.

Therefore, with the same device illumination, it is possible to create a given positions of those absorbing light strips having a predetermined width and which correspond to each electron beam.

Therefore, after creating the light-absorbing the stripes are well-balanced pattern on the entire surface of the screen corresponding to the appropriate strips of phosphor, having an initial period lone width. Consequently, horses are obtained luminaire picture tubes having excellent reproducibility colors.

Although the way was presented in the relationship with colored picture tubes having luminous stripes nophores and light-absorbing stripes, that's the way it can also be used for manufacturing tube lamps having only tricolor phosphor strips.

Claims (5)

1. Claims 85 1. A method of producing a strip screen for the production of color cathode-ray tubes containing in one line a set of electron guns emitting a central electron beam and a pair of side beams, a strip screen formed on the inner the face plate surface and the shadow mask integrated in the forehead plate and having a large number of average holes, the path of irradiation with a linear light source through the shadow mask and a corrective lens positioned between the light source and the shadow mask, characterized in that the corrective lens is and a linear light source are used at each step of the strip screen making, the relative azimuth of the correcting lens between the 50 irradiation steps corresponding to the central beam and the irradiation steps corresponding to the side beams differ by an angle of 90 °, and the linear light source whose direction coincides with the direction of the stripes on the screen and moves to the position corresponding to each electron beam at each stage of illumination. 2. The method according to claim The method of claim 1, characterized in that the axis of symmetry of the corrective lens at the steps 60 of irradiation corresponding to the side beams is aligned with the plane of the three beams aligned. 3. The method according to p. The method of claim 1, wherein the strip screen is formed of light-absorbing stripes. 15 20 25 30 35 40 45 50 5592 985 10 4. The method according to p. The method of claim 1, characterized in that the strips alternating between the strips of the strip screen are formed from strips of phosphor absorbing the light. 5. .5 FIG. i \ o W YV \ i — ttti VA <\ LJ92 985 FIG. 3A, FIG. 3B FIG. 3C FIG. 3D T- 8 9 8 7 \ h. FIG. 3E FIG. 3F 24 5 FIG. 3G FIG. 3H 22 2392 985 FIG. 4B-3 FIG. 4B-292 985 FIG. 5-l FIG. 5-3 FIG. 5-2 FIG. 6-2 FIG. 6-3 OZGraph. Lz. 1096 (110 + 25 copies) Price PLN 10