JP2514576Y2 - Convergence yoke device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a convergence yoke device for supplying a convergence magnetic field to the inside of the neck portion of a CRT, and more particularly to improvement of the structure of the core portion.

[Prior Art] Conventionally, a convergence yoke device has been used to perform convergence correction in a CRT.

For example, in a color projection device in which monochromatic CRTs are arranged in parallel and an image of the monochromatic CRT is projected onto a screen through a lens to obtain a color image, a convergence yoke device is used to correct distortion of the image on the screen. Is mandatory.

FIG. 2 shows a conventional configuration example of a convergence yoke device used in, for example, a color projection device.

In the convergence yoke device 10 shown in this figure, an annular portion 12 made of a magnetic material such as ferrite is used.
The core portion 14 (eight core portions 14-1 to 14-8 in the figure) is provided so as to project from the inner peripheral surface of the annular portion 12 by a predetermined number. Further, a convergence coil 16 is wound around the core portion 14. Convergence coil 16
Among the eight core portions 14, 14-8, 14-1, 14-2 are wound in phase with the same number of turns, and the core portions 14-6, 14 facing each other are wound.
In -5 and 14-4, the same number of turns is wound in the opposite phase to the former.

That is, when a convergence current having a predetermined waveform is supplied to the convergence coil 16, the core portion 14-8,
Between 14-1, 14-2 and 14-6, 14-5, 14-4, a convergence magnetic field 100 shown by a chain line in the figure is generated.

Although not shown in this figure for simplification, another convergent coil is wound around the core portions 14-8, 14-7, 14-6, and the core portions 14-2, 14- By winding the convergence coils in the opposite phases on 3 and 14-4 as well, a convergence magnetic field 200 as indicated by a broken line in the drawing is generated.

The convergence yoke device 10 shown in this figure is a CR
It is attached to the neck of T. That is, when the convergence yoke device 10 is attached to the neck portion of the CRT and a convergence current is supplied to the convergence coil 16, a convergence magnetic field as shown by 100 in the drawing is supplied to the inside of the CRT. . The same applies to the convergence magnetic field 200 related to the other convergence coils described above.

Therefore, in the past, the convergence magnetic field 100, 200 generated between the core portions 14 and supplied to the inside of the CRT causes the CRT to
It was possible to perform convergence correction on the electron beam traveling inside.

[Problems to be Solved by the Invention] However, in the past, there was a problem that the convergence magnetic field was not uniform and, as a result, an obstacle such as defocusing occurred on the screen. That is, due to the convergence current flowing in the convergence coil,
The convergence magnetic field supplied to the inside of the CRT becomes a so-called barrel-shaped magnetic field which is not a straight line especially at the ends as shown in FIG.

In order to prevent such a barrel-shaped magnetic field and obtain a more uniform magnetic field, for example, the number of turns of the convergence coil may be changed for each core portion. However, such setting of the number of turns of the convergence coil increases the cost of winding the convergence coil particularly in manufacturing the convergence yoke device. Generally, the convergence coil is attached to the core through the bobbin, but if the number of turns of the convergence coil is set as described above, it is necessary to prepare a bobbin in which the convergence coil has a plurality of turns specifications. It becomes a factor leading to an increase in component cost.

The present invention has been made to solve the above problems, and is an inexpensive convergence yoke device capable of obtaining a uniform magnetic field while winding a convergence coil with the same number of turns on each core portion. The purpose is to provide.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides an annular part formed of a magnetic material, and an annular part formed integrally with the annular part. A first core portion of a predetermined length, which is projected and is further projected and arranged in a predetermined number so as to be opposed to the predetermined number, is integrally formed with the annular portion, and both sides of the first core portion are formed. And a second core portion having a length of 1 or less with respect to the first core portion, and the first core portion and the second core portion. And a convergence coil that generates a convergence magnetic field having different strengths in the first core portion and the second core portion when supplied, and is attached to the neck portion of the CRT to supply the convergence magnetic field inside the CRT. It is characterized by

[Operation] In the present invention, when the convergence current is supplied to the convergence coil wound around the first core portion and the second core portion, the strengths differ from the first core portion and the second core portion. A convergence magnetic field is generated and is supplied to the inside of the CRT. That is, the second core portion has a shorter length than the first core portion, and the convergence magnetic field generated in the second core portion is weaker than the convergence magnetic field generated in the first core portion. It becomes a magnetic field.

Therefore, the convergence magnetic field supplied to the inside of the CRT is adjusted according to the ratio of the lengths of the first core portion and the second core portion, and becomes a more uniform magnetic field.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. The same components as those in the conventional example shown in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 shows the configuration of a convergence yoke device according to an embodiment of the present invention.

In the convergence yoke device shown in this figure
20 has a predetermined number of core portions 22 (eight core portions 22-1 to 22-8 in the figure) protruding from the inner peripheral surface of the annular portion 12. Each of the core portions 22-1 to 22-8 has a length set according to the features of the present invention.

That is, of the eight core parts 22-1 to 22-8, 22-
1,22-3,22-5,22-7 have a length A, and the other core portions 22-2,22-4,22-6,22-8 have a length B. There is. The length B is, for example, about 0.6 to 0.8 times the length A.

In this figure, the convergence coil is omitted, but the convergence coil is the same as the conventional one.
It is assumed that each core portion 22 is wound with the same number of turns.

In addition, one of the two types of (vertical and horizontal) convergence coils is wound around the core portions 22-8, 22-1, 22-2 in the same phase, and the core portions 22-6, 22-5 facing each other are wound. , 22-4 are wound in reverse phase. The other convergence coil is wound around the core portions 22-6, 22-7, 22-8 in the same phase, and oppositely wound around the core portions 22-4, 22-3, 22-2. It is supposed to be turned.

In this embodiment, when a convergence current is supplied to the convergence coil wound around the core portion 22-1 and the like, a convergence magnetic field 110 shown by a dashed line in the vertical direction in the drawing is generated. This convergence magnetic field 1
A magnetic field 10 is generated according to the length setting (that is, the setting of A and B) according to the features of the present invention. That is, the convergence magnetic field generated by the other four core parts 22-8, 22-2, 22-6, 22-4 is, in contrast to the convergence magnetic field generated by the core parts 22-1, 22-5 of length A, B / A times stronger. Therefore, unlike the convergence magnetic field 100 in the conventional example, it does not become a barrel type, and a more uniform magnetic field 110
Will occur. Especially when B / A is set to about 0.6 to 0.8, the number of simultaneous hits is high.

Such an operation is the same for the convergence magnetic field 210 shown by the broken line in the figure.

In the present embodiment, the number of core portions 22 is 8,
That is, although it has 8 poles, it may be 6 poles or 12 poles, for example.

[Effects of the Invention] As described above, according to the present invention, while keeping the number of turns of the convergence coil wound around the core part constant,
A more uniform convergence magnetic field can be supplied to the inside of the CRT, and a clearer image can be provided by an inexpensive device.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a convergence yoke device according to an embodiment of the present invention, and FIG. 2 is a plan view showing a configuration example of a conventional convergence yoke device. 12 …… Annular part 16 …… Convergence coil 20 …… Convergence yoke device 22-1 to 22-8 …… Core part A …… Length of core parts 22-1, 22-3, 22-5, 22-7 B: Length of core part 22-2, 22-4, 22-6, 22-8 110, 210 ... Convergence magnetic field

Claims (1)

(57) [Scope of utility model registration request] 1. An annular part formed of a magnetic material, and an annular part formed integrally with the annular part, a predetermined number of which are arrayed and protruded from the inner peripheral surface of the annular part, and another predetermined part facing the predetermined number. A first core portion having a predetermined length, which is arranged in a protruding manner in a number, and is integrally formed with the annular portion, and is provided so as to be adjacent to both sides of the first core portion so as to project from the first core portion. The second core portion having a length of 1 or less, and the first core portion and the second core which are wound around the first core portion and the second core portion and are supplied with a convergence current. A convergence yoke device, comprising: a convergence coil for generating a convergence magnetic field having different strengths from each other, and being attached to the neck portion of the CRT to supply the convergence magnetic field inside the CRT.