JPH10302673A - Cathode-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode-ray tube device wherein compactibility of a magnetic core is not damaged, adjustment of winding distribution is facilitated, and convergence and the like are satisfactory. SOLUTION: A multiplicity of linear grooves 34 running in a radial manner are provided substantially at regular intervals in an inner circumferential surface of a magnetic core 31 of a deflection yoke and projection-shaped partition parts 35 are formed between the linear grooves 34. A larger diameter end 31a which serves as a phosphor screen side front end when mounted on a cathode- ray tube and a smaller diameter end 31b which serves as an electron gun side rear end are each mounted with a semi-annulus ring-shaped guide 36 having a multiplicity of hook-like winding lock parts 37. Further, the guide 30 is provided with a hook-like winding position regulating part 38, similarly to the winding lock part 37, on at least one linear groove part among the multiplicity of linear grooves 34. When a saddle type deflection coil is windingly mounted on this magnetic core 3, windings having passed in the linear grooves 34 are hung up on the winding lock parts 37 or on the winding position regulating parts 38, which are selected in accordance with magnetic field distribution adjustment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube device such as a picture tube device comprising a vacuum envelope and a deflection yoke which is provided on the vacuum envelope and applies a deflection magnetic field to an electron beam.
The present invention relates to a deflection yoke having a magnetic core provided with a plurality of grooves.

[0002]

2. Description of the Related Art In general, a cathode ray tube device used for a television receiver or a monitor terminal has a structure in which a deflection yoke is provided on a vacuum envelope constituting a cathode ray tube. A panel portion having a certain phosphor screen formed on an inner surface, a neck portion having an electron gun for emitting an electron beam toward the phosphor screen, and a funnel portion connecting the panel portion and the neck portion. That is, the deflection yoke is provided on the boundary region between the funnel portion and the neck portion.

The deflection yoke includes at least a horizontal deflection coil and a vertical deflection coil for deflecting an electron beam emitted from an electron gun of a cathode ray tube in horizontal and vertical directions, respectively, and a magnetic core disposed close to the deflection coils. Configuration. In a cathode ray tube for a display such as a monitor terminal, a configuration in which both a horizontal deflection coil and a vertical deflection coil are arranged as saddle type coils and disposed inside a magnetic core is general.

Recently, as shown in FIG. 7, a slot type magnetic core 11 provided with a large number (usually several to several tens) of slot-shaped grooves 12 on its inner surface is used and wound around these grooves. A part of the wire (not shown) is housed, hooked on the winding engagement part 15 of the guide 14, and the transition part of the saddle type coil is housed in the concave part 16 formed by the winding engagement part 15 of the guide. There is a deflection yoke 10 as described above.

This slot type magnetic core reduces the eddy current generated in the horizontal and vertical deflection coils by the high frequency horizontal deflection magnetic field, reduces the Joule loss, thereby reducing the amount of heat generated, and the partition between the grooves is formed by the cathode ray tube. Since the deflection sensitivity is increased by approaching the neck and the driving power can be reduced, the deflection frequency is relatively high, such as the deflection yoke used in the cathode ray tube device for computer displays, which requires measures against heat generation. Is particularly effective.

[0006]

Recently, the deflection angle of a cathode ray tube apparatus for a computer display has been reduced to 90 degrees.
With the transition from degrees to wide deflection angles, finer adjustment of the magnetic field distribution is required.

When a saddle-type deflection coil is wound using the above-mentioned slot-type magnetic core, there is a certain limitation in adjusting the winding distribution. That is, since the slot-type magnetic core is manufactured by press-molding a magnetic material and then sintering the same, in consideration of the removability, as shown in FIG. The slot-shaped groove 12 can be provided only in the vicinity of the upper part, and the winding engaging portion 1 located at the extension of the partition 13 between the slot-shaped grooves.
5 is used to wind the winding. As a result, the winding 17 on the inner surface of the core follows the radiation direction, and adjustment for obtaining a desired magnetic field distribution with good convergence characteristics is performed by the winding arranged linearly in the radiation direction through the center of the tube axis. It must be performed, and fine adjustment of the winding distribution cannot be performed.

On the other hand, Japanese Patent Application Laid-Open No. Hei 4-79133 discloses a method of providing a bypass groove. However, when manufacturing a magnetic core by pressing is also considered, the method of forming a groove for bypass is also disclosed. It is difficult to remove the mold, and since the bypass groove is formed in advance, there is a limit in adjusting the winding distribution depending on the bypass position.

Accordingly, the present invention is to provide a cathode ray tube device having a deflection yoke for easily adjusting the winding distribution without impairing the moldability of the magnetic core and having good predetermined characteristics such as convergence. Aim.

[0010]

In order to solve the above-mentioned problems, the present invention comprises a panel having a phosphor screen formed on an inner surface thereof, and an electron gun for emitting an electron beam toward the phosphor screen. A vacuum envelope comprising a neck portion, a funnel portion connecting the panel portion and the neck portion, and a plurality of sheaths provided at a boundary region between the funnel portion and the neck portion, and a large number of inner portions at predetermined intervals along the circumferential direction. A cathode ray tube device comprising a magnetic core provided with a groove, and a deflection yoke provided with a deflection coil wound on the magnetic core by a part of the winding entering the groove. It is an improvement.

[0011] The present invention is characterized in that the magnetic core has a winding position regulating portion located at at least one of the plurality of grooves at a front end or a rear end of the magnetic core. In addition, saddle winding is enabled by having a winding locking portion located at an extension of the partition wall between the grooves.

The present invention is also directed to a panel having a phosphor screen formed on an inner surface thereof, a neck provided with an electron gun for emitting an electron beam toward the phosphor screen, the panel and the neck. A vacuum envelope consisting of a funnel portion and a magnetic core which is provided in a boundary region between the funnel portion and the neck portion, and has a plurality of grooves provided at predetermined intervals along a circumferential direction on the inside. A front guide having a plurality of winding engaging portions disposed at a front end and a rear end of the magnetic core and arranged at predetermined intervals in a circumferential direction; And a deflection yoke having a deflection coil wound around the magnetic core and the guide.

In the present invention, the front or rear guide has a winding position regulating portion at a position corresponding to at least one of the grooves. The winding position restricting section allows the windings running obliquely to be arranged in the groove, thereby facilitating the adjustment of the magnetic field distribution.

The winding locking portion according to the present invention is characterized in that it is a hook-shaped member extending along the inner peripheral surface of the magnetic core by extending the partition between the grooves. Further, the winding position regulating member is a hook or a projection protruding in the direction of the center of the tube axis of the cathode ray tube or along the tube axis. By doing so, the position of the winding running obliquely in the groove can be reliably regulated, and the transition portion of the saddle-type coil can be formed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of a cathode ray tube device according to the present invention, and the deflection yoke will be described with reference to FIGS.

FIG. 1 shows a color picture tube apparatus. A cathode ray tube on which a deflection yoke described later is mounted includes a panel section 22 having a phosphor screen 21 formed on an inner surface thereof.
The electron beam 23B is directed toward the phosphor screen 21.
It has a neck portion 25 in which an electron gun 24 for emitting 23G and 23R is provided, and a funnel portion 26 connecting the panel portion 22 and the neck portion 25. The panel portion 22, the funnel portion 26, and the neck Constructs an envelope. A deflection yoke 30 is provided on the boundary between the funnel 26 and the neck 25. As described above, since the present embodiment is a color picture tube device, a shadow mask 27 as a color selection electrode is disposed inside the panel portion 22 with its periphery supported by the mask frame 28, and
The phosphor screen 21 also has a configuration in which a large number of red, green, and blue phosphor dots are formed.

As shown in FIG. 2, the deflection yoke 30 has a structure in which a pair of saddle type horizontal deflection coils 32 and a pair of saddle type vertical deflection coils 33 are arranged inside a magnetic core 31. The magnetic core 31 is provided with a number of grooves on the inside at predetermined intervals along the circumferential direction, and a part of the winding (usually a saddle type coil forming a deflection coil) is formed in the grooves. A deflection coil is wound around the magnetic core as a result of entry of a portion other than the transition portion).

The magnetic core will be described in more detail with reference to FIGS. The magnetic core 31 shown in FIG.
It is divided into two parts in the radial direction, and forms a headed cylindrical magnetic core 31 together with the other magnetic body (not shown).
On the inner peripheral surface of the magnetic core 31 made of ferrite, a large number of radially extending grooves 34 are provided at substantially equal intervals, and a convex partition wall 35 is provided between the grooves. And
Each of the large-diameter end 31a serving as the front end on the fluorescent screen side and the small-diameter end 31b serving as the rear end on the electron gun side when attached to the cathode ray tube has a large number of hook-shaped winding locking portions 37. A semi-annular guide 36 is mounted on the magnetic core 31 so that a saddle-type coil (not shown) can be wound on the magnetic core 31. Each hook 37 provided on the guide 36 is provided on an extension of the partition wall 35 between the grooves, and the hook 37 is provided on at least one of the plurality of grooves 34. Similarly to the above, a hook-shaped winding position restricting portion 38 is provided. In order to simplify the drawing, only the front end guide is shown and the rear end guide is omitted.

With such a configuration, as shown in an enlarged view in FIG. 4, the winding position regulating portion 38, which is a hook-like member, is also located at a portion corresponding to the groove 34. FIG. 4B shows a cross section along the partition wall 35 between the grooves, and FIG. 4C shows a cross section along the grooves 34. As is clear from FIGS. 4B and 4C, the winding locking portion 37 and the winding position regulating portion 38 are both moved from portions 37 a and 38 a substantially along the inner surface of the magnetic core 31 to the center of the tube axis. Radially outwardly bent portion 37
b, 38b. And
A cross section storage section 39 having a substantially U-shaped cross section is formed on the outer periphery of the guide by the hook. When a saddle-type deflection coil is wound using such a magnetic core, the winding passing through the groove 34 is wound in accordance with the adjustment of the magnetic field distribution.
Alternatively, it is formed by selecting the winding position restricting portion 38 and looping it over the selected hook so as to go around the concave portion and pass a predetermined groove, and the like is repeated.

According to the deflection yoke having such a configuration, as shown in FIG. 5, in addition to the winding 41 running linearly in the radial direction from the center of the tube axis in one groove 34, the center of the tube axis does not pass. Since the windings 42 and 43 running in the non-radiation direction can also be arranged, the winding distribution can be arbitrarily changed and an arbitrary magnetic field distribution can be obtained. Further, since the winding position regulating portion 38 is provided on at least one of the front and rear end guides of the magnetic core,
Since the groove 34 may extend linearly in the radial direction from the center of the tube axis, the magnetic core can be easily manufactured by press molding.

Further, in this embodiment, since the winding engaging portion and the winding position regulating portion are provided integrally with the guide, the winding is not affected by the press beam of the magnetic core. It is possible to easily form a structure capable of reliably holding a bent portion which is a boundary between the main deflection magnetic field generating portion and the crossover portion of the coil.

By mounting such a deflection yoke on a cathode ray tube, it is possible to obtain a cathode ray tube device having good predetermined characteristics such as convergence. In the present embodiment, the winding position restricting portions are provided on the guides disposed before and after the magnetic core, but may be provided only on one of the front end and the rear end guides. Further, the winding position restricting portions need not be provided corresponding to all the grooves, but may be provided corresponding to positions where the winding distribution is to be adjusted. Further, the shape of the winding position restricting portion is not limited to the above-described hook shape, and may be a protrusion 44 as shown in FIG. Although this projection protrudes toward the center of the tube axis in the drawing, it may be a projection that protrudes in the direction along the tube axis.

Further, in the magnetic core of the embodiment described above, a large number of grooves extend from the front end to the rear end, but may have a structure provided partially along the tube axis direction. In the above embodiment, the guide is provided with the winding position restricting portion, but may be provided on the magnetic core.

[0024]

As described above, according to the present invention,
While using a magnetic core having a groove extending along the radial direction from the center of the tube axis, which is easy to press-mold, the winding distribution can be changed to a winding distribution along the non-radiating direction. The distribution can be easily obtained. As a result, it is possible to obtain a cathode ray tube device having good predetermined characteristics such as convergence.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a cathode ray tube device according to the present invention.

FIG. 2 is a diagram schematically illustrating a deflection yoke of the cathode ray tube device shown in FIG.

FIG. 3 is a diagram for explaining a magnetic core portion of the deflection yoke of FIG. 2;

FIGS. 4A and 4B are enlarged views of a main part of a magnetic core part of FIG. 3, wherein FIG. 4A is a perspective view of the main part, FIG. 4B is a cross-sectional view of a partition wall between grooves, and FIG. It is sectional drawing in a groove part.

FIG. 5 is a diagram for explaining a winding state in the deflection yoke in FIG. 3;

6A and 6B are views showing a modification of the magnetic core portion of the deflection yoke according to the present invention, wherein FIG. 6A is a perspective view of a main part, FIG. 6B is a cross-sectional view of a partition wall between grooves, and FIG. It is sectional drawing in a groove part.

7A and 7B are enlarged views of a main part of a magnetic core portion of a conventional deflection yoke, wherein FIG. 7A is a perspective view of the main part, and FIG. 7B is a cross-sectional view of a partition wall between grooves.

FIG. 8 is a diagram for explaining a winding state in the deflection yoke of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 30 ... Deflection yoke 31 ... Magnetic core 32 ... Saddle type horizontal deflection coil 33 ... Saddle type vertical deflection coil 34 ... Strip groove 35 ... Partition wall part 36 ... Guide 37 ... Winding locking part 38 ... Winding position regulating part 44 ... Projection

Claims (6)

[Claims] 1. A panel having a phosphor screen formed on an inner surface thereof, a neck provided with an electron gun for emitting an electron beam toward the phosphor screen, and a funnel connecting the panel and the neck. A magnetic core, which is provided in a boundary region between the funnel portion and the neck portion, and has a plurality of grooves provided at predetermined intervals along a circumferential direction on an inner side thereof; A deflection yoke comprising: a deflection coil wound around the magnetic core by a part of the winding entering the magnetic core; and a plurality of grooves at a front end or a rear end of the magnetic core. A cathode ray tube device comprising a winding position restricting portion located in at least one of the grooves. 2. The cathode ray tube device according to claim 1, further comprising a winding locking portion located at an extension of the partition between said grooves. 3. A panel portion having a phosphor screen formed on an inner surface thereof, a neck portion provided with an electron gun for emitting an electron beam toward the phosphor screen, and a funnel connecting the panel portion and the neck portion. A magnetic core which is provided in a boundary region between the funnel portion and the neck portion and has a plurality of grooves provided at predetermined intervals along a circumferential direction on an inner side thereof; and A front guide having a plurality of winding engaging portions arranged at a front end and a rear end of the front end and arranged at predetermined intervals in a circumferential direction, and a part of the winding enters the groove. A deflection yoke having a deflection coil wound around the magnetic core and the guide, wherein the front or rear guide has at least one of the grooves.
A cathode ray tube device having a winding position restricting portion at a position corresponding to the above. 4. The hook-shaped member according to claim 2, wherein the winding locking portion is an extension of a partition between the grooves and extends along the inner peripheral surface of the magnetic core. Cathode ray tube device. 5. The cathode ray tube device according to claim 1, wherein the winding position regulating member has a hook shape. 6. The cathode ray tube according to claim 1, wherein the winding position regulating member is a projection protruding in the direction of the center of the tube axis of the cathode ray tube or along the tube axis. Cathode ray tube device.