JPH04328226A - Deflection yoke for color cathode-ray tube - Google Patents

Abstract

PURPOSE:To provide an excellent grade of displaying with no risk of misconvergence. CONSTITUTION:A deflection yoke of a color cathode ray tube is equipped at least three guide grooves 1 for making location upon inserting a wedge-shaped jaunting adjustment tool in the separator part 2. Therewith the deflection yoke 4 can be secured certainly.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke for a color cathode ray tube, and more particularly to a deflection yoke for an autoconvergence type color cathode ray tube.

0002

[Prior Art] When adjusting the installation of a deflection yoke in an auto-convergence type color cathode ray tube, the installation position in the direction of the tube axis affects color purity, and the installation angle with the tube axis affects convergence. High installation accuracy is required.

For this reason, a wedge-shaped deflection yoke attachment adjustment tool 3 as shown in FIG. 3 is used.

FIG. 4 is a side view showing an example of how a conventional deflection yoke is attached, and FIG. 5 is a rear view of FIG. 4. In FIGS. 4 and 5, 4 is a deflection yoke, 5 is a cone portion of the cathode ray tube, and 6 is a neck portion of the cathode ray tube.

As shown in FIGS. 4 and 5, a deflection yoke 4
is finally fixed to the neck part 6 by a tightening fitting 7, but the installation position in the tube axis direction and the installation angle with respect to the tube axis are such that it is inserted between the cone part 5 and the front surface of the deflection yoke 4. This is determined by the wedge-shaped attachment adjustment tool 3. After the mounting position and angle are determined, three mounting adjustment tools 3 are inserted into the gap between the deflection yoke 4 and the cone portion 5 of the cathode ray tube at intervals of about 120°, and fixed with an adhesive.

That is, image reproduction on a color cathode ray tube is achieved by precisely adjusting and fixing this deflection yoke.

[0007]

[Problems to be Solved by the Invention] However, in the conventional adjustment and fixing method, although precise and accurate adjustment is performed, it is difficult to manually insert the wedge-shaped attachment adjustment tool 3 when adjusting the attachment of the deflection yoke 4. Because this is done during work, the insertion angle of the wedge-shaped attachment adjustment tool 3, which should normally be inserted at 120° intervals in the radial direction with respect to the tube axis, is not constant, and after the deflection yoke 4 is fixed, the angle between the deflection yoke 4 and the tube axis is not constant. There was a problem in that the angle changed, causing a shift in convergence and having to be readjusted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a deflection yoke for a color cathode ray tube that provides excellent display quality without convergence deviation due to changes in the angle between the deflection yoke and the tube axis.

[0009]

[Means for Solving the Problems] The present invention provides a deflection yoke for an auto-convergence type color cathode ray tube, in which guide grooves are provided in at least three locations for inserting and positioning a wedge-shaped attachment adjustment tool into a separator portion. It is characterized by:

0010

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a first embodiment of the present invention.

In the first embodiment, as shown in FIG. 1, a guide groove 1 is provided for inserting a wedge-shaped attachment adjustment tool 3 shown in FIG.
Cuts with a width of 2 mm and a width that allows installation adjustment tool 3 to be inserted are made at 120° intervals, and installation adjustment tool 3 is inserted.
The structure allows the tube to be inserted accurately at 120° intervals in the radial direction of the tube axis.

By providing such a guide groove 1 in the separator portion 2 of the deflection yoke 4, there is no change in the angle between the deflection yoke 4 and the tube axis after the deflection yoke 4 is fixed, and the occurrence of convergence deviation can be prevented.

FIG. 2 is a perspective view of a second embodiment of the invention.

In the second embodiment, as shown in FIG. 2, a separator portion 2 forming the outer shell of a deflection yoke 4 is fitted with a pair of protrusions 8 having a width that allows the adjustment tool 3 to be inserted and a height of 1 mm. This is an example in which guide grooves 1 are provided at intervals of 120°.

This embodiment also provides the same effects as the first embodiment.

[0017]

[Effects of the Invention] As explained above, the present invention provides a guide groove for inserting a wedge-shaped adjustment tool in the separator portion of the deflection yoke, thereby making it possible to securely fix the deflection yoke, thereby eliminating convergence deviation. This has the effect of providing better display quality.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a first embodiment of the invention.

FIG. 2 is a perspective view of a second embodiment of the invention.

FIG. 3 is a perspective view of an example of an attachment adjustment tool for fixing the deflection yoke.

FIG. 4 is a side view showing an example of a state in which a conventional deflection yoke is attached.

FIG. 5 is a rear view of FIG. 4;

[Explanation of symbols]

1 Guide groove 2 Separator part 3. Installation adjustment tool 4 Deflection yoke 5 Cone part 6 Neck part 7 Tightening metal fittings 8.Protrusion

Claims (1)

[Claims] [Claim 1] A deflection yoke for an auto-convergence type color cathode ray tube, characterized in that at least three guide grooves are provided in the separator portion for inserting and positioning a wedge-shaped attachment adjustment tool. deflection yoke.