JPS59112542A - Deflection system for color picture tube - Google Patents

Abstract

PURPOSE:To enable correction of white ballance due to mislanding by varying the center of deflection of deflecting system relatively thereby correcting doming or extension to circumferential direction of holed section of shadow mask. CONSTITUTION:First auxiliary deflection system 22 and second auxiliary deflection system 23 comprising auxiliary horizontal and vertical deflection coils are provided in front and rear of main deflection system 21 comprising main horizontal and vertial deflection coils,then said main deflection system 21 and first auxiliary deflection system 22 are operated to move the center of deflection in Z-axis or forwardly while main deflection system 21 and second auxiliary deflection system 23 are operated to move the center of deflection in counter Z- axis or rearwardly.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a deflection device for color storage, and in particular, to correcting the white balance of a fluorescent surface caused by thermal expansion of a shadow mask built into a color picture tube. The present invention relates to a deflection device for a color picture tube that can be used in a color picture tube.

[Technical background of the invention and its problems]

As shown in Figure 1, the shadow mask structure installed in the 1mW collar receiver of the Shadow 122 type has a perforated part (2) with an electron beam passage hole and a skirt (3).
) A-Ranaru shadow mask (1) and skirt TM
(3) It is composed of a frame (5) to which the entire bath is covered.

In such a shadow mask structure, the perforated part (2) is silently deformed into a dome shape in the tube axis (Z) direction V when the electron beam from the electron gun hits it, as shown by the broken line (4). become one. Each of the electron beam passing holes (
The electron beam (6) corresponding to the paper (not shown) becomes a temporary binding (7). The deviation of the electron beam 6) in the direction of the arrow also forms a fluorescent gap (not shown).

The impact position of the electron beam on the phosphor layer, which emits blue-colored light, is off-center, which deteriorates the white balance of the color picture tube. In the figure (Bl is the center of one bucket direction.

Many applications have been filed as a countermeasure to this problem, but there are still fundamental issues and there are still some problems.

[Object of the Invention] The present invention is based on the above-mentioned points,
It is useful not only for doming the perforated part of the Yado mask, but also for expanding the perforated part in the peripheral direction by thermal J-sculpting of the frame.
The object of the present invention is to provide a deflection device for a collar 91 bulb which is designed to prevent deterioration of the lance even when the lance is used.

[Summary of G Ming]

The present invention also provides a main deflection device consisting of at least a main/K+m direction coil and a main 1-direction 11i1i coil, a royal horizontal deflection coil, and a main! l′T of the 1st edition direct deflection coil
Auxiliary / II consisting of IU + auxiliary horizontal deflection coil and/or auxiliary vertical deflection coil provided at the IJ part and the rear part
This is a deflection device for a color picture tube characterized in that the relative V deflection center position can be varied by a main direction device and an auxiliary deflection device.

[Embodiments of the invention]

First, as shown in FIG. 2, the electron beam deflected by the deflection center (B) passes through one electron beam passing hole in the perforated rod of the shadow mask uI), and is emitted by a predetermined fluorescent light. When the electron beam (16) hitting the body layer 181 is thermally deformed into a dome shape and reaches the position of the propagation line (l(1)), the electron beam α force passing through the same electron beam passage hole is as described above. It moves in the direction of the tube axis (Z) as shown, but at this time the phosphor layer 0
8) and the point where the straight line connecting the multiplex beam advance/retreat hole when doming changes with the tube axis (Z) is (Bll) and the deflection center is (B
)-n- et al. (B1) will prevent mislanding. Of course, in Figure 2, the deviation of the electron beam is enlarged for explanation, so the center of deflection (Bl
Although the distance between Bll and (Bll) is large, in reality, mislanding can be prevented by a very small deviation of the deflection center. The same effect can be achieved by moving in the opposite direction.

This embodiment is based on the above-mentioned idea.

That is, as shown in FIG. 3, the main deflection device c! consists of at least a main horizontal field coil and a main vertical deflection coil. D and this main deflection device C! An auxiliary deflection device t2 and a second auxiliary deflection device 3) are provided at the front and rear of the υ, and are composed of an auxiliary horizontal deflection coil and an auxiliary vertical deflection coil, respectively. Main deflection device C211 and the first
By operating the auxiliary deflection device C4, the main deflection device (21) and the second auxiliary deflection device (C) are moved relative to the tube axis (Z+ direction, that is, forward). By doing so, the center of deflection can be relatively moved in the opposite direction of the tube axis (Z), that is, to the rear.

These deflections & fit 1 river 21 CI! The operation and switching of 3) can be adjusted with the deflection' power supply waveform for some deflections, but the amount of doming in the peripheral direction of the perforated part is 116.
This is unique to color picture tubes such as J-type picture tubes, and during the adjustment process, the white balance due to mislanding due to these phenomena is measured on a fluorescent surface, and this value is stored in advance in a memory element, etc. It can be operated by commands from.

In the embodiment described above, two auxiliary deflection devices C27J (23
), but depending on the color picture tube, either one may be used, and it is not necessary to explain that either one of the auxiliary horizontal deflection coil and the auxiliary vertical deflection coil may be provided.

〔Effect of the invention〕

As described above, according to the present invention, the white balance caused by mislanding can be corrected by relatively varying the deflection center of the deflection device, such as the doming of the perforated portion of the mask and the expansion toward the periphery. The industrial value is great.

[Brief explanation of the drawing]

FIG. 1 is a clear view of electron beam movement due to doming of the hole Wll of the shadow mask, FIG. 2 is a detailed explanatory diagram of the present invention, and FIG. 3 is a simplified explanatory diagram showing an embodiment of the present invention. It is. l, 11...7 Yado mask 2.4, 12.14...perforated portion 6, 7.16.17...electron beam 18...fluorescent layer 21...main deflection device 22. 23... Auxiliary deflection device agent Patent attorney Inoue - Male

Claims (1)

[Claims] a main deflection device consisting of at least a main horizontal deflection coil and a main vertical deflection coil; an auxiliary deflection device consisting of an auxiliary horizontal deflection coil and/or an auxiliary vertical deflection coil provided at the front and/or rear of the main deflection device; 1. A deflection device for a color picture tube, characterized in that the deflection center position can be varied in an a-ray manner by an R8ft recorder/direction device and the auxiliary deflection device.