JPS5927012Y2 - deflection yoke - Google Patents

Description

[Detailed description of the invention] This invention is a semi-toroidal deflection yoke having a saddle-shaped horizontal deflection coil and a toroidal-shaped vertical deflection coil of a self-convergence type inline color cathode ray tube. The present invention also relates to a deflection yoke with improved deflection and focus.

Conventionally, self-convergence type in-line color cathode ray tubes have a saddle-shaped horizontal deflection coil with a bottle cushion-shaped magnetic field distribution and a doloidal-shaped vertical deflection coil with a barrel-shaped magnetic field distribution to correct misconvergence of the deflection yoke. , color cathode ray tube center electron gun (
Green) For sensitivity correction, a field controller (FC) as shown in Fig. 1 is used to increase the center beam sensitivity in the vertical and horizontal directions on the face of the color cathode ray tube.

However, these field controllers (FC) used in color cathode ray tubes must be small and precisely crafted in order to be enclosed in the color cathode ray tube electron gun, and their installation accuracy is limited. There is almost no distance from other electrodes, making it very difficult and expensive.At the same time, the center beam sensitivity changes greatly depending on the deflection yoke used even in color cathode ray tubes of the same size. F
C) The shape had to be changed, causing problems such as changes in color cathode ray tube performance and lack of compatibility within the same size.

At the same time, installing this field controller (FC) applies a locally strong magnetic field to a very small space and changes the center beam, which distorts the electron beam spot, causing deterioration of deflection and focus. The focus quality on the screen deteriorated.

Therefore, there has been a demand for a deflection yoke that can vary the center beam without using a field controller for a color cathode ray tube and that can improve deflection and day focus.

It is an object of the present invention to provide a deflection yoke that satisfies the above requirements, eliminates the field controller in a color cathode ray tube, increases center beam sensitivity in misconvergence, and improves deflection and focus.

Embodiments of the present invention will be described in detail below with reference to the drawings.

That is, as shown in FIGS. 2 and 3, there is a self-convergence type in-line collar having a saddle-shaped horizontal deflection coil with a bottle cushion-shaped magnetic field distribution and a toroidal-shaped vertical deflection coil 1 with a barrel-shaped magnetic field distribution. A set of two magnetic bodies 3 is attached to the neck part of a cathode ray tube 2 so as to be substantially parallel to the electron gun.

As a result, the backward magnetic field 4 from the neck of the vertical deflection coil 1 as shown in FIG. 4 a, l) is collected by the magnetic body 3 as shown in FIG. The magnetic field 4 behind the neck portion of the vertical deflection coil 1 is directed in the direction of the bottle cushion magnetic field, thereby increasing the center beam sensitivity in the vertical direction.

At this time, both side beam sensitivity is increased and vertical deflection sensitivity is also increased.

Next, regarding the deflection day focus, the vertical magnetic field distribution in the deflection yoke of the conventional self-convergence type is a barrel-shaped magnetic field as a whole, as shown in Figure 6. In order to increase this, the spot distortion of the electron beam was increased in order to create a locally strong pin magnetic field.

Therefore, in this embodiment, as shown in Fig. 7, the perpendicular magnetic field distribution of the deflection yoke is changed to a magnetic field at the rear of the neck as a pin magnetic field using the air gap of the magnetic material, thereby increasing the center beam sensitivity and at the same time reducing the deflection day focus. Improvements are also being made.

As the material of the magnetic body 3, for example, silicon steel plate, permalloy, ferrite sheet, iron, etc. can be used.

The structure of the magnetic body 3 may be a set of two semi-cylindrical plates 301, 302 as shown in FIG. 303 may be integrally formed, and furthermore, a contact piece 304 for contacting the ferrite core of the deflection yoke may be integrally provided on the semi-cylindrical plates 301 and 302 as shown in FIG. 8C.

In this case, the protruding piece 303 spreads the vertical magnetic field over a wide range, and the contact piece 304 functions to take out the vertical magnetic field directly from the vertical coil.

The semi-cylindrical plate 301 is used to generate a pin magnetic field at the neck portion using the vertical magnetic field extracted by the protruding piece 303 and the contact piece 304.

Compared to the method using only the semi-cylindrical plate 301, by combining the protruding piece 303 and the contact piece 304, the vertical magnetic path length becomes longer, the vertical deflection sensitivity can be increased, and the vertical center beam (green) Sensitivity can be adjusted freely.

In this way, the effect can be varied depending on the material and shape of the magnetic body, the gap distance t between the two semi-cylindrical plates 301 and 302, etc.

As described above, according to the present invention, distortion in the deflection yoke, misconvergence of both side beams, horizontal sensitivity,
It is possible to improve vertical center beam sensitivity, vertical deflection sensitivity, and deflection focus without changing characteristics such as landing, and it is also possible to eliminate the field controller of a color cathode ray tube.

[Brief explanation of drawings]

Fig. 1 is a layout diagram of a field controller of a conventional color picture tube electron gun seen from the funnel side, Fig. 2 is a side view showing an embodiment of the present invention, Fig. 3 is also a rear view, and Fig. 4 Figures a and l) show the rear magnetic field of the vertical coil neck of the deflection yoke in the absence of a magnetic material according to the present invention, a is a diagram showing the relationship with the electron beam, b is a diagram showing the relationship with the vertical coil, Fig. 5 is a diagram showing an example of the rear magnetic field of the vertical coil neck of the deflection yoke according to the present invention, Fig. 6 is a diagram showing the distribution of the conventional vertical coil magnetic field in the axial direction of the CRT, and Fig. 7 is a diagram showing an example of the vertical coil neck rear magnetic field according to the present invention. Figures 8a, 1) and 8c are schematic perspective views showing different examples of the magnetic material according to the present invention. 1... Vertical deflection coil, 2... In-line color cathode ray tube, 3... Magnetic material.

Claims (1)

[Scope of utility model registration request] In the deflection yoke of a self-convergence type in-line color cathode ray tube, the magnetic field distribution by the horizontal deflection coil is bottle-shaped and the magnetic field distribution by the vertical deflection coil is barrel-shaped. A deflection yoke characterized in that two semi-cylindrical magnetic bodies are arranged facing each other, and the magnetic field behind the neck of the vertical deflection coil is made into a bottle cushion magnetic field between the mutually opposing ends of the magnetic bodies.