JP3062034U - Electronic beam deflection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventless type electron beam deflecting device for a cathode ray display tube, in which the magnetic field distribution of a horizontal deflection coil is locally changed to optimize the conversion (focusing) of an electron beam in the cathode ray display tube. Adjust the balance and reinforce the magnetic field strength of the horizontal deflection coil as a whole. SOLUTION: The electric wires are divided into bundles, and the plurality of windows 32A, 32 of the vertical deflection coil 30 wound so that a plurality of through-hole windows 32A, 32B ... are formed between the electric wire bundles.
B. A part or all of the magnetic layer 3 made of ferromagnetic powder
3 is loaded.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is directed to a ventless type electron beam deflecting device, which can locally change the magnetic field distribution of the horizontal deflection coil and adjust the conversion of the electron beam in the cathode ray display tube to an optimal balance. The present invention relates to an electron beam deflector that can reduce power consumption by reinforcing the magnetic field strength.

[0002]

[Prior art]

 As shown in FIG. 4, a cathode ray display tube (hereinafter, simply referred to as a “display tube”) used for a television or a computer display includes a tubular neck portion 110 having a built-in emission section 101 for an electron beam E; A display unit 120 extending from the neck 110 to display an image by the impact of the electron beam E; and an outer periphery of the path of the electron beam E, the axis P of the display tube and A tube-shaped electron beam deflecting device 200 is mounted coaxially and gradually increases in diameter from the neck to the display. The electron beam deflecting device 200 deflects an electron beam E emitted by carrying an image signal in the electron beam emitting unit 101 in a horizontal direction and a vertical direction. The same applies to the case of a color display tube, in which three electron beams carrying image signals corresponding to the three primary colors of R (red), G (green), and B (blue) are emitted from the electron beam emitting unit, respectively. The electron beam is deflected in the horizontal and vertical directions by the electron beam deflecting device, and the deflected electron beams strike fluorescent dots emitting R, G, and B light on the fluorescent screen of the display unit to form an image.

As shown in FIGS. 4 and 5, an electron beam deflecting device used for these display tubes is generally coaxial with the axis P of the display tube 100 and from the neck side of the display tube 100. A pair of horizontal deflection coils 210, 210 which are formed into a tubular shape whose diameter gradually increases toward the side and are vertically arranged to face each other, and a coil separator 220 having the horizontal deflection coils 210, 210 mounted on the inner surface thereof. It has a pair of vertical deflection coils 230, 230 which are formed along the outer periphery and are arranged to face each other in the horizontal direction, and further have an annular ferromagnetic core (ferrite core) 240 arranged on the outer periphery. doing.

In the electron beam deflecting device 200, a pair of horizontal deflection coils 210 and 210 have a function of deflecting the electron beam E in the horizontal direction by applying a vertical magnetic field to the path of the electron beam E. The pair of vertical deflection coils 230, 230 has the function of deflecting the electron beam in the vertical direction by applying a horizontal magnetic field to the path of the electron beam. The coil separator 220 separates the horizontal deflection coil 210 and the vertical deflection coil 230 from each other and supports them so that their positions do not shift. The ferromagnetic core 240 is mounted to increase the density of the magnetic flux formed on the path of the electron beam E by the horizontal deflection coil 210 and the vertical deflection coil 230.

As shown in FIG. 6, the horizontal deflection coil 210 is generally formed in a saddle shape whose diameter gradually increases from the neck of the display tube toward the display. A conventional horizontal deflection coil is called a "vent type", and a portion where an electric wire rises radially with respect to an axis P in a flange shape and is wound, that is, a vent portion 211 is formed on the neck side. . In the bent type electron beam deflector, the vertical deflection coil 230 is also formed into a substantially similar shape, and a similar vent portion 231 is formed.

However, the vent type has a complicated assembly procedure. For example, the ferromagnetic core 240 and the like cannot be mounted unless the split type is used. For example, as shown in FIG. 3, one example of a horizontal deflection coil is a so-called “ventless type” horizontal deflection coil and a vertical deflection coil that only gradually expands in diameter from the neck to the display, but lacks a vent. Coils have come to be used.

In this ventless type electron beam deflector, the horizontal deflection coil 210 and the vertical deflection coil 230 only unilaterally increase in diameter from the neck side to the display unit side. The flange-shaped vent portions 211 and 231 are not formed. Therefore, when assembling the electron beam deflector, a pair of vertical deflection coils 230 and 230 are mounted on the outer surface of the coil separator 220 having a pair of horizontal deflection coils 210 and 210 mounted on the inner surface, and then the outer periphery thereof is mounted. The above-mentioned annular ferromagnetic core 240 may be simply fitted, and the fitted ferromagnetic core 240 may be bonded and fixed to the coil separator 220 using a hot melt adhesive or the like, so that the number of parts and the number of assembly steps are reduced. There is an advantage that it can be greatly reduced.

[0008]

[Problems to be solved by the invention]

 When the above-mentioned ventless type deflection coil is used, the magnetic flux density of both the horizontal deflection coil 210 and the vertical deflection coil 230 is enhanced by the ferromagnetic core 240. However, since there is no flange-shaped vent portion 211, the magnetic field distribution is locally changed in order to adjust the conversion (convergence) of the electron beam in the display tube, particularly in the horizontal deflection coil 210 arranged in the inner layer. However, there is a problem that the method of adjusting the magnetic field distribution used for the bent type deflection coil, such as attaching a ferromagnetic material to the vent portion 211, cannot be used. Further, since the horizontal deflection coil 210 is farther from the ferromagnetic core 240 than the vertical deflection coil 230, the intensity of the magnetic field generated by the constant current is generally smaller than that of the vertical deflection coil 230. In order to obtain the amount of deflection, it is necessary to supply a relatively large current to the horizontal deflection coil 210, and there is a problem that the power consumption of the electron beam deflection device increases. The present invention has been made to solve the above-described problem, and accordingly, the purpose is to locally change the magnetic field distribution of the horizontal deflection coil to achieve an optimal balance of electron beam conversion in the display tube. It is an object of the present invention to provide an electron beam deflecting device for a display tube that can be adjusted as described above, and an electron beam deflecting device for a display tube that can reduce power consumption by totally reinforcing the magnetic field strength of a horizontal deflection coil.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, the present invention is directed to a first aspect of the present invention, in which a pair of horizontal deflection coils arranged vertically opposed to each other, and a pair of vertical deflection coils arranged horizontally opposed to each other on the outer periphery thereof. And an annular ferromagnetic core disposed on the outer periphery thereof, wherein the vertical deflection coil divides the electric wires into bundles, and a plurality of through-hole windows are formed between the bundles of electric wires. An electron beam deflecting device in which a magnetic layer made of ferromagnetic powder is loaded in a part of the plurality of windows so as to locally change the magnetic field distribution of the horizontal deflection coil. provide.

In the electron beam deflecting device according to the first aspect, since a magnetic layer made of a ferromagnetic material is loaded in a part of the plurality of windows formed in the vertical deflection coil, a loading position of the magnetic layer is provided. By adjusting the loading amount and the magnetic field distribution of the horizontal deflection coil, the conversion of the electron beam in the display tube can be adjusted to an optimum balance.

The present invention provides an electron beam deflecting device according to claim 2, wherein all of the plurality of windows are loaded with a magnetic layer made of the ferromagnetic powder. In this case, the effect similar to that of bringing the ferromagnetic core closer to the horizontal deflection coil side can be obtained by the magnetic layer loaded in all of the plurality of windows, and as a result, the magnetic layer is disposed in the innermost layer. The vertical magnetic field strength of the horizontal deflection coil is reinforced as a whole, so that the amount of power supplied to the horizontal deflection coil can be reduced.

In any of the above-mentioned inventions, it is preferable that the magnetic layer is formed by bonding ferromagnetic powder with a binder. In this way, the magnetic layer can be easily formed in accordance with the complicated shape of each window to be loaded, and can be adhered to the window with the binder. Further, by adjusting the ratio between the ferromagnetic powder and the binder, the magnetic field strength of the magnetic layer can be appropriately changed. Therefore, if an appropriate amount of the kneaded material of the ferromagnetic powder and the binder is applied in advance to the selected window and solidified, extra time is required to load the magnetic layer when assembling the electron beam deflector. Nor.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described by way of examples with reference to drawings. Embodiment 1 FIG. 1 shows an electron beam deflector according to an embodiment of the present invention. The electron beam deflecting device 1 is of a so-called ventless type, and is entirely formed into a tube whose diameter gradually increases from the neck to the display portion of a display tube (not shown). The separator 20, the vertical deflection coil 30, and the ferrite core 40 are each configured to be embedded in a fitting manner.

As shown in FIG. 2, the vertical deflection coil 30 is wound in a saddle shape in which an electric wire gradually increases in diameter from the neck portion of the display tube toward the display portion. Within the curved surface to be formed, the electric wire is divided and wound into a plurality of wire bundles 31A, 31B, and a plurality of through-hole windows 32A, 32B are formed between the wire bundles 31A, 31B. ing. In this embodiment, among these windows 32A, 32B,..., Only the window 32B formed on the side of the neck is filled with a magnetic layer 33 formed by bonding ferrite powder with a binder. ing. The vertical deflection coils 30 are combined symmetrically with respect to a vertical plane including the axis P of the display tube so as to form a pair horizontally opposed to each other. Deflects the electron beam in the display tube vertically.

The horizontal deflection coil 10 is the same as that conventionally used in a ventless type electron beam deflector, and similarly to the vertical deflection coil 30 shown in FIG. 2, an electric wire is provided on the neck side of the display tube. Is wound in a saddle shape gradually increasing in diameter toward the display unit side, and the electric wire is divided into a plurality of bundles and wound around the saddle-shaped curved surface formed by the horizontal deflection coil 10, and is wound between the electric wire bundles. , A plurality of through-hole-shaped windows are formed. However, unlike the vertical deflection coil 30, the window is not loaded with a magnetic layer. The horizontal deflection coils 10 are combined in a pair symmetrically arranged with respect to a horizontal plane including the axis P of the display tube so as to be opposed to each other in the vertical direction. , 10 (only one of which is shown in FIG. 1) deflects the electron beam in the display tube horizontally.

The coil separator 20 is a plastic molded product formed in a tubular shape whose diameter gradually increases from the neck portion side of the display tube (not shown) to the display portion side, and the horizontal deflection coils 10, 10 are provided on the inner wall thereof. keeping.

The ferromagnetic core 40 is a ferrite molded article formed in an annular shape, and is formed of a magnetic flux formed on the path of the electron beam by the horizontal deflection coils 10 and 10 and the vertical deflection coils 30 and 30. Fitted to increase density.

In the electron beam deflector 1 of the first embodiment, the magnetic layer 33 is loaded only in the window 32B that is a part of the windows 32A, 32B,... Formed in the vertical deflection coil 30. In actual use, the magnetic field distribution of the horizontal deflection coil 10 disposed in the inner layer of the vertical deflection coil 30 is locally corrected as compared with the original state in which the horizontal deflection coil 10 is not loaded, and the electron beam in the display tube is not corrected. Conversions are adjusted for optimal balance.

In the first embodiment, the magnetic layer 33 is mounted only on the window 32B. However, this magnetic layer is used to convert the electron beam in the display tube according to the type of display tube or vertical deflection coil. The loading position and the loading amount can be appropriately selected so as to achieve the optimum balance, and the window can be loaded into one or more of the plurality of windows.

(Embodiment 2) The electron beam deflector of this embodiment is the same as Embodiment 1 except that the state of loading of the magnetic layer loaded in the window of the vertical deflection coil is different. Therefore, here, only the loaded state of the magnetic layer will be described with reference to FIG. In the following description, components common to those of the first embodiment described with reference to FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof will be omitted or simplified.

In FIG. 3, the vertical deflection coil 30 is wound in a saddle shape in which an electric wire gradually expands in diameter from the neck portion of the display tube toward the display portion, and has a curved surface formed by the vertical deflection coil 30. Inside, the electric wire is divided and wound into a plurality of electric wire bundles 31A, 31B, and a plurality of through-hole-shaped windows 32A, 32B,... Are formed between the electric wire bundles 31A, 31B,. All of these windows 32A, 32B are filled with magnetic layers 33 formed by binding ferrite powder with a binder.

In the electron beam deflecting device of the second embodiment, since the magnetic layers 33 are loaded in all of the windows 32A, 32B,. The same effect can be obtained as when 40 is brought closer to the horizontal deflection coil 10 side, whereby the vertical magnetic field strength of the horizontal deflection coil 10 is reinforced, and therefore the power to be supplied to the horizontal deflection coil 10 for a predetermined electron beam deflection amount The amount can be reduced.

[0023]

[Effect of the invention]

 In the electron beam deflecting device according to the first aspect of the present invention, since a magnetic layer made of ferromagnetic powder is filled in a part of the plurality of windows formed in the vertical deflecting coil, By locally changing the magnetic field distribution, the conversion of the electron beam in the display tube can be adjusted to an optimum balance. In the electron beam deflecting device according to the second aspect of the present invention, all of the plurality of windows formed in the vertical deflecting coil are filled with a magnetic layer made of ferromagnetic powder. The magnetic field strength can be reinforced and power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a vertical deflection coil used in the embodiment.

FIG. 3 is a perspective view showing a vertical deflection coil used in another embodiment of the present invention.

FIG. 4 is a perspective view showing an example of a conventional ventless vertical deflection coil.

FIG. 5 is a schematic diagram of a display tube equipped with a general electron beam deflector.

FIG. 6 is a perspective view showing a configuration of a general electron beam deflector.

FIG. 7 is a perspective view showing an example of a vent type vertical deflection coil.

[Explanation of symbols]

 1: Electron beam deflector 10: Horizontal deflection coil 20: Coil separator 30: Vertical deflection coil 31A, 31B: Wire bundle 32A, 32B: Window 33: Magnetic layer 40: Ferrite core

Claims (3)

[Utility model registration claims] 1. A ventless type electron beam which is formed in a tubular shape and surrounds a path of an electron beam in a cathode ray display tube and gradually expands in diameter from a neck portion to a display portion side coaxially with the cathode ray display tube. A deflecting device, wherein the electron beam deflecting device includes a pair of horizontal deflecting coils that are vertically opposed to each other, a pair of vertical deflecting coils that are horizontally opposed to each other, and An annular ferromagnetic core disposed on the outer periphery, wherein the vertical deflection coil is wound so as to divide the electric wires into bundles and form a plurality of through-hole windows between the electric wire bundles, An electron beam deflector, wherein a magnetic layer made of a ferromagnetic powder is loaded in a part of the plurality of windows so as to locally change a magnetic field distribution of the horizontal deflection coil. 2. A ventless type electron beam which is formed in a tubular shape and surrounds a path of an electron beam in a cathode ray display tube and gradually expands in diameter from a neck portion to a display portion side coaxially with the cathode ray display tube. A deflecting device, wherein the electron beam deflecting device includes a pair of horizontal deflecting coils that are vertically opposed to each other, a pair of vertical deflecting coils that are horizontally opposed to each other, and An annular ferromagnetic core disposed on the outer periphery, wherein the vertical deflection coil is wound so as to divide the electric wires into bundles and form a plurality of through-hole windows between the electric wire bundles, An electron beam deflecting device, wherein a magnetic layer made of ferromagnetic powder is loaded in all of the plurality of windows to reinforce the magnetic field strength of the horizontal deflection coil. 3. The electron beam deflecting device according to claim 1, wherein the magnetic layer is formed by combining ferromagnetic powder with a binder.