JP3110598B2 - Deflection yoke - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke mounted on an in-line type color cathode ray tube.

[0002]

2. Description of the Related Art Conventionally, a deflection yoke mounted on an in-line type color cathode ray tube has a coil separator 4 corresponding to an electron gun side of a deflection yoke 5 as shown in FIG.
A pair of guide rails 6 are formed in the portion of the above in parallel with the in-line type electron gun. Then, one or a pair of magnetic pieces 1 are slidably mounted on the guide rail 6 to correct the horizontal anisotropic astigmatism of the minus pattern and plus pattern as shown in FIGS. 3 (a) and 3 (b). I was In addition, a silicon steel plate was generally used frequently for the magnetic piece 1.

[0003]

By the way, in the deflection yoke 5 configured as described above, for example, FIG.
In the case where the horizontal anisotropic astigmatism of the minus pattern as shown in FIG. 4 is corrected by the magnetic piece 1, there is a disadvantage that the horizontal static convergence remains in the plus pattern as shown in FIG. Therefore, after correcting the horizontal anisotropy astigmatism, it is necessary to correct the deviation of the horizontal static convergence remaining by the static magnet. Then, even if the horizontal static convergence is corrected in this manner, the horizontal isotropic astigmatism remains as a minus pattern as shown in FIG. As a result, the image quality deteriorated, the image quality did not meet the required standard, and defective products were easily manufactured.

This is because the coercive force of the silicon steel sheet is large (40 Hc (A / m) or more), so that even if the horizontal deflection magnetic field is zero, the horizontal static convergence is shifted due to the residual magnetism. Here, as shown in FIG. 3B, when the horizontal anisotropy astigmatism is a plus pattern, the patterns of the horizontal static convergence and the horizontal anisotropy astigmatism are also opposite patterns.

As described above, when the horizontal anisotropic astigmatism is corrected by using a magnetic piece made of a silicon steel sheet, there is a great difficulty that the deviation of the horizontal static convergence and the horizontal isotropic astigmatism change in conjunction therewith. there were. For this reason, the work of adjusting the image quality to be within the required standard requires skill, and there is a problem in workability.

It is an object of the present invention to provide a deflection yoke which can easily correct horizontal anisotropic astigmatism without interlocking with horizontal static convergence deviation and horizontal isotropic astigmatism.

[0007]

Means for Solving the Problems A pair of guide rails are provided at a coil separator portion corresponding to an electron gun side of a deflection yoke mounted on an in-line type color cathode ray tube, comprising a horizontal deflection coil, a vertical deflection coil, and a coil separator. the provided in parallel with the in-line type electron gun, said guide rail fitted with a magnetic piece slidably by magnetic piece in the deflection yoke configured to correct the horizontal anisotropic astigmatism by changing the magnetic field distribution, thin-strip amorphous alloy From
The becomes amorphous sheet of polyvinyl chloride resin or
Acrylic resin against the reinforcing material 3 made of polycarbonate resin
The magnetic pieces 1 comprising brought more adhered to Chakuzai 7, the horizontal scan
Influences on tactic convergence and horizontal isotropic astigmatism
The horizontal anisotropic astigmatism is corrected without affecting .

[0008]

[Function] The coercive force of the amorphous alloy is 1 / of that of the silicon steel sheet.
Because it is as small as about 10 (3.5 Hc (A / m) or more)
Remanence when the horizontal deflection magnetic field is 0 Most rather name has changed to shift or water equality isotropy astigmatism horizontal static convergence be corrected horizontal anisotropic astigmatism is Na occurs
Therefore , the image quality is improved. Further, it since by itself in a thin strip-shaped weak amorphous sheet strength bonding the reinforcing material made of a synthetic resin, the mechanical strength of the amorphous sheet is up, have use amorphous sheet like the silicon steel sheet as a magnetic piece it can.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. FIG. 1 shows several metallic elements (eg, iron, cobalt,
A magnetic sheet used in the deflection yoke of the present invention using an amorphous sheet made of a so-called ribbon-shaped amorphous alloy obtained by combining a nickel alloy), specifically, METGLAS (registered trademark for amorphous metal manufactured by Allied Signal Inc., USA). FIG. 2 is a diagram showing the deflection yoke viewed from the electron gun side. In the figure, reference numeral 2 denotes a square amorphous sheet having a thickness of about 0.02 mm, and reference numeral 3 denotes a synthetic resin reinforcing material made of polyvinyl chloride resin or polycarbonate resin, which has a thickness of about 0.3 mm. Reference numeral 7 denotes an acrylic adhesive, which adheres and fixes the amorphous sheet 2 and the reinforcing material 3. Reference numerals 6 and 6 denote a pair of guide rails provided at the rear end of the coil separator 4 of the deflection yoke 5 and formed so as to be parallel to the in-line type electron gun.

The deflection yoke according to the present invention comprises an amorphous magnetic piece 1 formed by fixing an amorphous sheet 2 cut into a predetermined length and shape to a reinforcing material 3 with an adhesive 7 and a rear end of a coil separator 4 of a deflection yoke 5. It is configured to be slidably attached to a pair of guide rails 6 provided in the section.

Table 1 shows a comparative example of characteristics when the amorphous magnetic piece 1 of the present invention and a silicon steel sheet are used as magnetic pieces. In Table 1, A represents horizontal anisotropic astigmatism, B represents horizontal static convergence, and C represents horizontal isotropic astigmatism. The unit is mm.

[0012]

[Table 1]

[0013]

According to the present invention, horizontal anisotropic astigmatism can be corrected without affecting horizontal static convergence and horizontal isotropic astigmatism. In addition, an amorphous sheet that could not be used as a magnetic piece in the past can be used in the same manner as a silicon steel sheet, and a deflection yoke with excellent adjustment workability and improved image quality can be obtained at low cost. .

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a magnetic piece used in the present invention.

FIG. 2 is a view of a deflection yoke as viewed from an electron gun side.

3A and 3B are explanatory diagrams showing horizontal anisotropic astigmatism, in which FIG. 3A shows a minus pattern and FIG. 3B shows a plus pattern.

FIG. 4 is an explanatory diagram showing a positive pattern of horizontal static convergence.

FIG. 5 is an explanatory diagram showing a minus pattern of horizontal isotropic astigmatism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic piece 2 Amorphous sheet 3 Reinforcement material 4 Coil separator 5 Deflection yoke 6 Guide rail 7 Adhesive

Continuation of the front page (56) References JP-A 3-121650 (JP, U) JP-A 61-161865 (JP, U) JP-A 63-202050 (JP, U) Dictionary of Physics October 30, 1992 Published by Nihon Baifukan pp. 1716-1717 Amorphous magnetic material (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 29/76

Claims (1)

(57) [Claims] An inline type electronic cathode ray tube comprising a horizontal deflection coil, a vertical deflection coil and a coil separator, wherein a pair of guide rails is provided on a coil separator corresponding to an electron gun side of a deflection yoke mounted on an inline type color cathode ray tube. A deflection yoke which is provided in parallel with the gun, slidably attaches a magnetic piece to the guide rail, and corrects horizontal anisotropic astigmatism by changing a magnetic field distribution by the magnetic piece ; An amorphous sheet made of an amorphous alloy is made of polyvinyl chloride resin or polycarbonate.
Acrylic resin-based adhesive to the reinforcing member 3 made of Nate resin 7
And configure allowed more contact adhesive, a horizontal static by magnetic piece 1
Affects tick convergence and horizontal isotropic astigmatism
A deflection yoke configured to correct horizontal anisotropic astigmatism without giving .