JP3477624B2 - Deflection yoke device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke device to be combined with a cathode ray tube used for a television receiver or the like. [0002] A conventional deflection yoke device will be described below. A cathode ray tube used in a television receiver or the like is provided with a so-called in-line electron gun in which electron guns are arranged in a row, and is generated by a deflection yoke device so as to scan an electron beam emitted from the in-line electron gun. The horizontal deflection magnetic field generated by the horizontal deflection coil for deflecting the electron beam in the horizontal direction is used as a pincushion magnetic field, and the vertical deflection generated by the vertical deflection coil for deflecting the electron beam in the vertical direction. The magnetic field is a barrel magnetic field. However, in recent cathode ray tubes, since the screen is flattened so as to emphasize the naturalness of the screen, raster distortion caused by the scanning of the electron beam and horizontal deflection magnetic field in the horizontal line are pincushion. Although it becomes a straight line, the vertical line has a pincushion distortion because the vertical deflection field is a barrel magnetic field. In order to correct the vertical pincushion distortion with the deflection magnetic field, it is preferable to set the electron gun side of the vertical deflection magnetic field to a barrel magnetic field and the screen side to a pincushion magnetic field. A method has been used in which an electric wire is wound and a necessary magnetic field is generated in a barrel magnetic field by using a magnetic material on the electron gun side (for example, see JP-A-4-262346). As shown in FIGS. 6 and 7, an insulating frame 3 is interposed between a horizontal deflection coil 1 formed of a saddle type and a vertical deflection coil 2 formed of a toroidal type.
And a pair of rectangular magnetic members 4 each having an arcuate concave surface that is in contact with the surface of the insulating frame 3 on the outer surface thereof. Note that reference numeral 5 in the figure is a core. In general, when the horizontal deflection coil 1 is incorporated in the insulating frame 3, the insulating frame 3 is formed by dividing the left and right into two parts as shown in FIG. The frame 3a and the right insulating frame 3b are moved from the left and right in the directions indicated by arrows, and the end surface 6a of the insulating frame 3a and the end surface 6b of the insulating frame 3b are brought into close contact with each other to form the mating surface 6 of the insulating frame 3. . The magnetic body 4 blocks a vertical deflection magnetic field generated by the vertical deflection coil 2 only at a certain portion of the magnetic body 4 (ie, a barrel magnetic field portion on the electron gun side), and a vertical line which is a desired characteristic on a screen. Correct raster distortion of. Therefore,
As shown in FIG. 9, a vertical deflection magnetic field generated by the vertical deflection coil 2 by the magnetic body 4 (the magnetic flux lines φV are indicated by dotted arrows).
Shutting off also means that the magnetic body 4 is left in the vertical deflection magnetic field, so that the magnetic body 4 vibrates in the horizontal axis direction as indicated by the outline arrow due to the line of magnetic force φV. This vibration also occurs at 60 Hz because the vertical deflection magnetic field is an alternating magnetic field having a period of 60 Hz. The vibration of the magnetic body 4 at 60 Hz becomes a groan sound and leaks to the outside.
As shown in FIGS. 10 and 11, a rectangular magnetic body 4 having a long side 4 a and a short side 4 b is formed by a hook hand projection 7 formed inside the vertical deflection coil 2 and on the outer surface of the insulating frame 3. The adhesive tape 8 was attached and fixed so that the central part of the long side 4a was positioned, and insulation from the vertical deflection coil 2 was secured from above. However, in such a configuration, the vibration of the magnetic body 4 cannot be sufficiently suppressed, and the hand projection 7
In this case, only the positioning of the magnetic body 4 is not performed, and neither vibration damping nor vibration suppression of the solid-borne sound is performed. In addition, the adhesive tape 8 affixed to the surface of the magnetic body 4 has an effect on sound insulation and sound absorption of air-borne sound. Did not. Therefore, when a cathode ray tube display device is used for a terminal of an electronic computer or a silent screen such as an environmental art such as a video clip in recent years, a growling sound generated from the magnetic material 4 is generated by the object. This is an obstacle for the cathode ray tube display device. [0013] As described above, in the conventional configuration, the vibration of the magnetic body 4 in the horizontal axis direction cannot be sufficiently suppressed, and the growling sound generated by the vibration of the magnetic body 4 is not transmitted to the outside. There was a problem that leakage occurred. The present invention solves the above-mentioned conventional problems, and provides a deflection yoke device in which the vibration of the magnetic body in the horizontal axis direction is reduced to reduce the howling noise generated by the vibration to the outside. The purpose is to do. To achieve this object, a deflection yoke device according to the present invention comprises a horizontal deflection coil and a vertical deflection coil.
A deflection coil, the horizontal deflection coil and the vertical deflection coil.
An insulating frame disposed between the vertical deflection coils and a part of the vertical deflection magnetic field of the vertical deflection coil ,
Forming a recess in contact with the surface of the insulating frame;
A magnetic body with notches formed on both end faces along the circumferential direction
Provided, cut in the end surfaces of the magnetic rod-shaped projections provided on the respective insulating frame <br/> on along the circumferential direction of the insulating frame
Each of the notches is fitted and works in the direction of opening to the magnetic body
A position where the force and the force acting on the insulating frame in the closing direction are balanced
And fixing the magnetic body to the insulating frame. [0016] [act] In this arrangement, the rod-like projections provided on the respective insulating frame, notches that Katachi設on both end surfaces of the magnetic body across between the insulating frame is integrated, the rod-like protrusions are magnetic of a body
Vibration in the horizontal axis direction is suppressed. Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. In the embodiment of the present invention, the same components as those of the above-described conventional example are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIGS. 1 and 2, the present embodiment is characterized in that an arc-shaped concave surface in contact with the surface of the insulating frame 3 is formed in place of the magnetic body 4 in the above-described conventional configuration. ,
And a rectangle having a long side 9a and a short side 9b, and a short side 9b
The magnetic body 9 has semicircular cutouts 9c and 9d formed at both end surfaces of the magnetic body 9, and the cutouts 9c and 9d of the magnetic body 9 are formed on the rod-shaped protrusions 10a and 10b provided on the insulating frames 3a and 3b. That is, the magnetic body 9 is fixed by fitting. Rod-shaped projection 1
The cross-sectional shapes of 0a and 10b are circular to fit into the notches 9c and 9d. Next, a method of fixing the magnetic body 9 to the insulating frame 3 will be described. First, as shown in FIG. 3A, the notches 9c and 9d of the magnetic body 9 are aligned with the rod-shaped protrusions 10a and 10b of the insulating frames 3a and 3b, and are moved in the direction shown by the arrow to move the rod-shaped. protrusions 10a, is gradually fitted entrance from above of 10b. At this time, the mating surface 6 of the insulating frame 3 is made as small as possible with a gap. Next, as shown in FIG. 3 (b), the notches 9c and 9d of the magnetic body 9 are inserted into the rod-shaped projections 10a and 10b.
The magnetic body 9 is completely fitted to a position where the magnetic body 9 does not advance earlier than the above. As a result, a force for opening in the direction indicated by arrow A acts on the magnetic body 9, and a force for closing in the direction indicated by arrow B opposite thereto acts on the insulating frame 3. The magnetic body 9 is fixed to the insulating frame 3 at a position where the opposing forces are balanced. That is, a state in which stress in the opposite direction is applied between the magnetic body 9 and the rod-shaped protrusions 10a and 10b of the insulating frame 3 is provided. When a vertical deflection current is applied to the vertical deflection coil 2 in this state, the magnetic body 9 vibrates in the direction indicated by the white arrow C as shown in FIG. However, since the opposing stress acts on the magnetic body 9 as described above,
The vibration is attenuated by the stress. as a result,
The growling sound emitted from the magnetic body 9 is reduced. As described above, according to this embodiment, the insulating frame 3
The rod-shaped protrusions 10a, 10b provided on the magnetic member 9 are fitted and integrated with the cutouts 9c, 9d formed on both end surfaces of the magnetic member 9, thereby fixing the rod-shaped protrusions 10a, 10b.
Is suppressed, and the groaning sound emitted from the magnetic body 9 is largely reduced, so that the cathode ray tube display device can be used without any obstacle even in a silent screen state. (Embodiment 2) Hereinafter, a second embodiment of the present invention will be described. As shown in FIGS. 4 and 5, this embodiment is characterized in that the magnetic material 9 is added to the configuration of the first embodiment.
Magnetic body 11 having circular holes 11c and 11d formed near both end surfaces of short side 11b in place of cutouts 9c and 9d.
That is, the inner surfaces of the holes 11c and 11d are brought into contact with the outer peripheral surfaces of the rod-shaped projections 10a and 10b of the insulating frames 3a and 3b to be fitted and integrated and fixed. Note that 11a in the figure is the long side of the magnetic body 11. The method of fixing the magnetic body 11 to the insulating frame 3 is as follows.
The description is omitted because it is the same as in the first embodiment. As described above, according to this embodiment, the magnetic material 1
1, holes 11c and 11d which are in contact with the outer peripheral surfaces of the rod-shaped projections 10a and 10b of the insulating frame 3 are formed.
a, 10b and the holes 11c, 11d are fitted and integrated and fixed.
1 and the insulating frame 3 are more firmly fixed than in the first embodiment. As is apparent from the above description, according to the present invention, notches are formed at both end faces of a magnetic body arranged to block a part of the vertical deflection magnetic field of the vertical deflection coil. The notch is fitted to a rod-shaped projection provided on each insulating frame, and the magnetic body is fixed to the insulating frame.
It is possible to realize an excellent deflection yoke device in which the horizontal vibration of the magnetic body is reduced and the howling noise generated by the vibration is reduced to the outside.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is an exploded perspective view of a main part of a deflection yoke device according to a first embodiment of the present invention, and FIG. 1 (b) is a cross-sectional view of a main part of the deflection yoke device. FIG. 3B is a front view of the magnetic body of the deflection yoke device, FIG. 3B is a plan view of the same, and FIG. 3C is a plan view of the same. FIG. FIG. 4 (a) is a front view of a magnetic body of a deflection yoke device according to Embodiment 2 of the present invention, FIG. 4 (b) is a side view thereof, and FIG. 4 (c) is a plan view thereof. 5 is an exploded perspective view of an essential part of the deflection yoke device. FIG. 6 is a half sectional view of a conventional deflection yoke device. FIG. 7 is a schematic sectional view of a position where a magnetic body of the deflection yoke device is provided. FIG. 9 is a schematic front view showing a state in which a horizontal deflection coil of the deflection yoke device is incorporated in an insulating frame. FIG. 10 is a perspective view of a state in which the magnetic body of the deflection yoke device is positioned by a hook projection. FIG. 11 is a cross-sectional view showing a fixed state of the magnetic body of the deflection yoke device. Schematic diagram [Description of symbols] 1 Horizontal deflection coil 2 Vertical deflection coil 3 Insulating frame 9 Magnetic bodies 9c, 9d Notch portions 10a, 10b Rod-like projections

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 29/76

Claims (1)

(57) [Claims 1] A horizontal deflection coil, a vertical deflection coil,
An insulating frame disposed between the horizontal deflection coil and the vertical deflection coil, and a concave surface which is disposed so as to block a part of a vertical deflection magnetic field of the vertical deflection coil and is in contact with a surface of the insulating frame. formed, with a magnetic body that Katachi設both end surfaces in the cutout portion along the circumferential direction of the insulating frame, of the insulating frame
The notches at both end surfaces of the magnetic body are fitted into rod-shaped projections provided on the respective insulating frames along the circumferential direction.
Into the magnetic body and force it to open, and close the insulating frame.
A deflection yoke device , wherein the magnetic body is fixed to the insulating frame at a position where the force acting in the turning direction is balanced .