JPS62126525A - Color cathode-ray tube - Google Patents

Abstract

PURPOSE:To make an adjusted state of color purity of an electron beam to a phosphor judgeable instantaneously, by forming a color adjusting part, generating a color adjusting light emitting zone, in a longitudinal edge of a mask opening for a shadow mask. CONSTITUTION:An inline type color picture tube has plural electron beams landed on plural colored phosphors disposed in striped form via a slotted hole- form mask opening 9 of a shadow mask 8, displaying colors. At this time, in a longitudinal edge of the mask opening 9 of the shadow mask 8, there is provided with a color adjusting part 13 which generates a color adjusting light emitting zone as connected to a light emitting dot for color displaying at least a partial zone of a surface displaying colors. And, whether the light emitting zone exists in the center of phosphor width or not, an adjusted state of color purity is judged. Accordingly, mislanding is no longer required, thus color purity adjusting efficiency is sharply improvable.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a color cathode ray tube.

[Technical background of the invention and its problems] Conventionally, in the adjustment and inspection process of color picture tubes, the color purity (
For example, the adjustment of the stability is performed as follows. First, the position of the deflection yoke relative to the picture tube is changed in the tube axis direction, so that the electron beam is not irradiated in a normal state.

This causes a so-called mislanding condition. Next, in this state, while visually checking the emission pattern of the phosphor on the display surface of the picture tube using a special microscope, the color purity adjustment magnet is slightly moved in the circumferential direction of υ around the tube axis.
The deflection position of the electron beam is adjusted by moving the installation position of the deflection yoke along the tube axis. Then, a series of these adjustment operations is performed for each of the red (几), green (G), and blue (CB) electron beams. At the point when it is least! i11 Finish the adjustment.

However, with this conventional adjustment method, you must first perform the extra work of causing a mislanding.
Secondly, it is generally difficult to determine the correspondence between the amount of mislanding of the electron beam on the phosphor and the amount of visibility, and there are many variations depending on the adjuster. iI alignment is low. Further, accurate adjustment requires skill and the burden on the adjuster is heavy, making it impossible to perform efficient adjustment.

In other words, when we examine the drawbacks of conventional adjustment methods in detail, we find that when an electron beam lands on a phosphor through a shadow mask, the lateral position of the electron beam depends on the coating of the phosphor around the phosphor. Since the electron beam is hidden in the unmarked stripe area and cannot be seen on the display surface of the color picture tube, when adjusting the landing, it is necessary to make a mislanding once and confirm the landing position of the electron beam before performing the color purity adjustment.

[Purpose of the invention]

This invention was made in response to the above points, and includes color adjustment,
In particular, the present invention provides a color cathode ray tube in which color purity adjustment can be performed with high precision.

[Summary of the invention]

That is, the present invention provides a color cathode ray tube that displays color by landing a plurality of electron beams on phosphors of a plurality of colors arranged in a stripe pattern through a shadow mask. A color cathode ray tube is obtained in which a portion for emitting light is provided in the active area.

[Embodiments of the invention]

Next, an embodiment in which the cathode ray tube of the present invention is applied to an in-line stripe type color picture tube will be described with reference to the drawings.

In-line stripe type color picture tubes are well known to those skilled in the art, so details thereof will be omitted.

As shown in Figures 3 and 4, an in-line stripe type color picture tube has a cathode ray tube face plate (
1) red 0 green (Q, blue@3) extending vertically on the inner surface of
Colored phosphor bands (2), <3), (4) are arranged periodically at predetermined intervals, and these phosphors +2), +3),
+4) to 几.

G, 83-color electron beam (5) , (6) , (7
) is accelerated and focused, and enters the shadow mask (8) while scanning through a deflection yoke (not shown) (see FIG. 2). That is, as shown in FIGS. 1 and 4, the shadow mask (8) has a width of 200 μm and a length of 11 μm, for example.
m mask apertures (9) are provided. Electron beams (5), (6) incident on this shadow mask (8)
(7) The electron beam generated from the IIi electron gun (not shown) is accelerated and focused, and is incident on the shadow mask (8) while scanning through a deflection yoke (not shown). In a color picture tube having such a configuration, in order to facilitate color purity adjustment, the light emitting dots (hatched areas) Ql, αV, α2 by the electron beams (5), (6), and (7) are Creating a light-emitting area for color adjustment (9) An embodiment of the present invention is to cause one eye to emit light.

In order to cause the color adjustment light emitting regions Qoa), Qob), and Qoc) to emit light, the following embodiment is used.

That is, FIG. 2 shows the three-color light emitting state of the screen of the inline stripe type color picture tube in this embodiment. As mentioned above, the screen of the color picture tube consists of three types of phosphors: red (R) (21), green (G) (3), and positive (8 units, 4 units).
This is a set of -, and these traps are arranged alternately. FIG. 1 shows the shadow mask (8) of this embodiment. That is, the shadow mask (8) has a color adjustment area formed with a rectangular protrusion at one end along the center line (→) of the elongated mask opening (9). There is.

Figure 4 shows the shadow mask (8) of the color picture tube at line D shown in Figure 2 and the R, G, B phosphor bands (2), (3
), (This is a partially enlarged view Wr'y7J showing the positional relationship between the 41 and the face plate (1), and shows the state of normally adjusted phosphor emission. In other words, the deflection yoke (not shown) ), the electron beams are incident at different angles after receiving a predetermined deflection (5) , (6) ,
(7) is the respective phosphor (2) passing through the aperture (9) of the shadow mask (8).

(31, (landing at 410) At this time, the diameter (width) H of the incident electron beam is the phosphor band (21, (3),
(The width of 41 'Op, 77 goebo is much larger, and even if the angle of incidence θ is slightly off, the phosphor band (2), (3
1. (This corresponds to 41.

However, on the other hand, when trying to measure or adjust the deviation of the incident angle θ, the black stripe a9 between the phosphors
The center of the beam @H is aligned with each phosphor [r
It is not possible to determine how much the phosphor is shifted from the center of the o, goy bo, and goy bo respectively.

For this reason, as shown in FIG. 1, the shadow mask (8) is provided with a line C, which overlaps perpendicularly with the center line a of the aperture (9) of the shadow mask in FIG. It is being Each electron beam that passed through this aperture a3 +5), (61, (7) is each phosphor band f2),
+3), (4) K Atashi, it is possible to correct and adjust the angle of incidence 0, which is the landing adjustment, from the position of the part where the light is emitted in the round direction when the light is emitted. In this way, it can also be used to measure the landing state of assembled and completed color picture tubes.

That is, each phosphor band +2+, (3), (41
In the display luminescent dots αt), (lυ, (12), the color adjustment luminescent area (13a)... is a phosphor band (2).
, (3), (4) indicates a normal beam landing state, while the phosphor band (2)
1, (3), (41) If the light is emitted away from the center, it indicates a mislanding.

The present invention is not limited to the above embodiments. For example, in the above embodiment, one color adjustment portion (1... This is done because the non-light emitting parts (13b) in the center of the phosphors (2), (3), +4) are shifted as shown in the figure. Furthermore, the shape of the color adjustment portion α-tension is not limited to a rectangular shape, and may be triangular, round, elliptical, or a non-symmetrical shape.

Furthermore, color adjustment parts (13...) are mask openings (9).
)...Not only one end, but also the other end trap may be formed at both ends. Furthermore, in the above embodiment, an example was explained in which the color adjustment apertures were arranged over the entire surface of the color picture tube display surface, but the color purity adjustment portion a3... was formed only in a part of the display surface. Good too. Furthermore, the number of color purity adjustment parts may also be set arbitrarily.

〔Effect of the invention〕

As explained above, according to the present invention, color purity is adjusted and judged without mis-landing, whereas in the conventional method, color purity is adjusted and determined by mis-landing. The color purity of the electron beam against the phosphor can be immediately determined by whether or not the mark for III is located at the center of the width of the phosphor.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the structure of a shadow mask of a color cathode ray tube according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a cathode ray tube display state when the shadow mask of FIG. 1 is used.
Figure 3 is an explanatory diagram of the relationship between the electron beam trajectory and the phosphor arrangement at the E-line position in Figure 2, and Figure 4 is an explanatory diagram of the relationship between the electron beam trajectory and the phosphor arrangement at the D-line position in Figure 2. FIG. 5 is a plan view of a shadow mask of a color cathode ray tube according to another embodiment of the present invention, and FIG. 6 is an explanatory diagram of a cathode ray tube display state when the shadow mask of FIG. 5 is used. (2), (3), (4)...fluorescent band, Ql
, (II) , (+3... Luminous dot for display, α
F...color! 1 circumference part. Agent Patent Attorney Noriyuki Chika Yudo Kikuo Takehana Figure 1 Figure 2 Figure 3 Figure 4

Claims (6)

[Claims] (1) In a color cathode ray tube that displays color by landing a plurality of electron beams on phosphors of multiple colors arranged in a stripe pattern through a mask aperture in the form of a long hole in a shadow mask, the mask aperture in the shadow mask is A color cathode ray tube characterized in that a color adjustment portion is formed at a longitudinal end portion of the color display surface in at least a part of the color display surface to connect to the light emitting dots for color display to generate a color adjustment light emitting region. . (2) The color cathode ray tube according to claim 1, wherein the color adjustment portion is a projection projecting inside the mask opening. (3) The color cathode ray tube according to claim 1, wherein the color adjustment portion is a notch recessed outside the mask opening. (4) The color cathode ray tube according to claim 2, wherein the color adjustment portion is smaller than the width of the mask aperture. (5) The color cathode ray tube according to claim 1, wherein the light emitting portion for color adjustment is formed at one end of the mask opening. (6) The color cathode ray tube according to claim 1, wherein the light emitting portions for color adjustment are formed at both ends of the mask opening.