JPS61128450A - Color picture tube device - Google Patents

Abstract

PURPOSE:To get a good convergence with a deflection yoke of convergence-free, by setting a magnetic piece which is narrower in its width than the space between both side electron beams, at the lower side of a vertical deflection coil, and at the neck side from the center of a deflection yoke. CONSTITUTION:A single electron gun color picture tube device which has three cathodes, which are called 'one-gun three-beams', is formed as setting a magnetic piece 7 which is preset-sized in its length and narrower in its width than the space between both side electron beams B, R, at the lower side of a vertical deflection coil 6V of a deflection yoke 6 of the color picture tube device, and at the neck-side from the center of this yoke 6. Then, the dangling phenomenon of a green central electron beam is corrected through decreasing the intensity of the vertical deflection magnetic field of the center part of a raster which is correspondent with the green central electron beam, and this green raster is put upon red and blue rasters. In this way, a precise TV-receiver of high quality can be got as a good convergence can be got with a deflection yoke of convergence-free.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color picture tube device suitable for use in a high-definition color television receiver.

[Conventional technology]

As a conventional color picture tube device, a Trinitron (trade name) picture tube device as shown in FIGS. 4 and 5 has been proposed. This color picture tube device has three horizontally arranged cathodes (I
A single electron gun type electron gun (1) having R) (IG) (IB) and these three cathodes (IR) (IG) (
Electron beams R, G emitted from IB).

After B intersects at the center of the main lens constituted by the bleeds 01 to G5 of the electron gun (1), an electrostatic deflection plate (2) that electrostatically deflects the discrete electron beam and a color selection mechanism are installed. The aperture grill (3), red, green,
A phosphor surface (4) in which striped phosphors emitting blue light are sequentially and repeatedly arranged, and horizontal and vertical deflection coils (6H).
and (6v), and has a deflection yoke (6) arranged near the boundary between the neck part (5a) of the glass pulp (5) and the funnel part (5b).

The Trinitron (trade name) picture tube device has excellent resolution because it uses a large diameter, single electron gun, and three-beam system. In addition, because the color selection mechanism uses Ano 4-char grill (3), the transmittance of the electron beam is high, and there is little deterioration of color purity due to geomagnetism.The detailed structure of the fluorescent surface is similar to dots and slots. When independent objects are arranged in an array, moiré (light interference) occurs due to the beat with the horizontally deflected raster, but in the case of a vertical lattice like stripes, no moiré is observed. The structure of the sorting mechanism prevents doming due to the heat of localized electron beam irradiation (there is no deterioration of color purity, etc.).

By the way, recently, in order to correct dynamic misconvergence in such a color picture tube device, a current for misconvergence correction is superimposed on the horizontal deflection coil (6H) and the vertical deflection coil (6V) without providing a convergence correction yoke. A convergence-free deflection yoke (6) is used.

[Problem that the invention seeks to solve]

In such a convergence-free deflection yoke (6), a vertical deflection coil (6v
) is a barrel magnetic field as shown in FIG. 6, and the horizontal magnetic field distribution due to the horizontal deflection coil (6H) is a pin magnetic field as shown in FIG. 6B.

In this way, in a color picture tube device using a convergence 7-lead deflection yoke, the red R as shown in Figure 7B.
1. This causes a phenomenon in which the green G of the central electron beam sag with respect to the blue B, and there is an inconvenience that this misconvergence occurs especially when the pitch of the phosphor surface is fine and high definition is achieved. There was an inconvenience that the sense could not be corrected.

In view of this point, the present invention aims to provide a deflection yoke with a convergence of 7 lees so that good convergence can be obtained.

[Means for solving problems]

The present invention uses three cathodes (IR) that emit electron beams.
, (IG), and (IB) are arranged horizontally in a color picture tube device, below the vertical deflection coil (6) of the deflection yoke (6), and at the bottom of the deflection type coil (6). A magnetic piece (7) of a predetermined length is provided on the neck side K of the deflection yoke (6) with a width narrower than the distance between the electron beams at both ends on the neck side with respect to the center of the deflection yoke (6).

[Effect]

According to the present invention, it is placed below the vertical deflection coil (6v) and on the neck side with respect to the center of the deflection yoke (6), and on the neck side with respect to the center of this deflection yoke (6). Since a magnetic piece (7) of a predetermined length is provided with a width narrower than the distance between the electron beams at both ends, the vertical deflection magnetic field at the center of the raster corresponding to the green center electron beam is weakened, as shown in FIG. As shown in Figure 7, the drooping phenomenon of the central electron beam of green G is corrected and the raster of green G becomes smaller. In this case, for example, as shown in FIG.
8), it is possible to weaken the vertical deflection magnetic field of only the red R and blue B electron beams on both sides, and the red R and blue B rasters can be superimposed on the green G raster, and in this case, convergence free deflection yoke (6)
good convergence can be obtained.

〔Example〕

Hereinafter, one embodiment of the color picture tube device of the present invention will be described with reference to FIGS. 1, 2, and 3. This first
In FIGS. 4 to 3, parts corresponding to those in FIGS. 4 and 5 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In this example, as shown in FIGS. 4 and 5.

For example, a cathode (IR
), (IG), and (IB), and these three cathodes (IR), (
Electron beams R, G emitted from IG) and (IB)
, B intersect at the center of the main lens composed of grids 01 to G51C of this electron gun (1), and then an electrostatic deflection plate (2) electrostatically deflects the scattered electron beam, and a color selection mechanism. Consisting of A/#-chargrill (3), red,
A fluorescent surface (4) in which stone-like phosphors emitting green and blue light are repeatedly arranged in sequence, and horizontal and vertical deflection coils (
6H) and (6v), and has a deflection yoke (6) arranged on the outer periphery near the boundary between the neck part (5a) and the 77-channel part (5b) of the glass pulp (5). Vertical deflection coil (6) of this deflection yoke (6)
Between the lower side of v) and the outer side of the glass bulb (5), as shown in Figure 1 and BK, this deflection yoke (6) is placed on the neck (5a) side from the midpoint in the tube axis direction. A magnetic piece (7) of gumalloy or the like having a predetermined length with a width smaller than the distance between the electron beams R and B at both ends at the midpoint in the tube axis direction.
will be established. In this case, the magnetic piece (the length of the force is determined according to the amount of sagging of the central electron beam G). Also, in this case, the deflection yoke (6) has a convergence-free configuration.

Further, in this example, as shown in FIGS. 3A and 3B, the deflection plates (2a) and (2) on both sides of the electrostatic deflection plate (2) of the color picture tube are
Sol pieces (8) made of gumalloy plate or the like are provided on the outside grid side of each of 2d). In this case, between the deflection plates (2a) and (2b), a red electron beam R1 between the deflection plates (2b) and (2C), the center electron beam G is green, and between the deflection plates (2C) and (2d), the center electron beam G is blue. B's electron beam B passes through and is deflected by the deflection plate (2) by this sol piece (8).
The electrostatic deflection magnetic field between a) and (2b) and between (2C) and (2d) is weakened, and the electrostatic deflection magnetic field between the deflection plates (2b) and (2C) is reduced by this pole piece (8). Not affected. The rest of the structure is the same as the conventional high-definition Trinitron (trade name) tube device.

This example is configured as described above, so the deflection yoke (6) has a convergence-free configuration, but is located below the vertical deflection coil (6v) and from the midpoint of this deflection yoke (6) in the tube axis direction. This deflection yoke (6) on the neck (5a) side
The vertical magnetic field distribution at the magnetic piece (7) is as follows: 2 In the approximately barrel magnetic field shown in Figure A, the magnetic piece (7
) becomes a weakened magnetic field, and the deflection of the central electron beam G is weakened at this intermediate position, and there is no effect at either end of the raster, so it is small, but as shown in Figure 7A. The result will be a raster with no sag. In this case, this magnetic piece (7) is located closer to the neck than the midpoint in the tube axis direction of the deflection yoke (6) and has a narrower width than the distance between the electron beams R and B at both ends, so that the center electron beam GK is affected by the magnetic piece (7). However, the electron beams R and B at both ends are not affected.

In addition, in this example, as shown in FIGS. 3A and 3B, pole pieces (8) are provided on the outside of each of the deflection plates (2a) and (2d) on both sides of the electrostatic deflection plate (2), Since the electrostatic deflection magnetic field of the red R and blue B electron beams R and B in this electrostatic deflection plate (2) section is weakened, the deflection of the second class electron beams R and B is weakened, and the second class electron beams R and B are deflected accordingly. The R and blue B rasters can be superimposed on the green G rasters, and good comparability can be obtained with the convergence-free deflection yoke (6). Other operations are the same as before.

Note that the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be obtained without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, it is possible to obtain a convergence-free deflection yoke with good surface convergence, so there is an advantage that a high-definition, high-quality color telepinoyon receiver can be obtained.

[Brief explanation of the drawing]

FIG. 1A is a cutaway cross-sectional view of a main part of an embodiment of the color picture tube device of the present invention, FIG. 1B is a front view of FIG. 1A, and FIGS. Diagram for explaining the invention, No. 3
Figure A is a perspective view of an example of the main part of Figure 1, Figure 3B is a cross-sectional view of Figure 3, and Figures 4 and 945 are diagrams showing examples of a conventional color picture tube device. (1) is an electron gun, (IR), (IG), and (IB) are cathodes, (2) is an electrostatic deflection plate, (5) is glass pulp, (6) is a deflection yoke, and (6v) is vertical. deflection coil,
(7) is a magnetic piece, and (8) is a pole piece. Figure 4

Claims (1)

[Claims] In a color picture tube device in which three cathodes that emit electron beams are arranged horizontally, the deflection yoke is placed below the vertical deflection coil of the deflection yoke and on the neck side with respect to the center of the deflection yoke. A color picture tube device characterized in that a magnetic piece of a predetermined length is provided with a width narrower than the spacing between electron beams at both ends on the neck side with respect to the center of the color picture tube device.