JPH01157037A - Deflection yoke - Google Patents

Abstract

PURPOSE:To restrain a temperature rise in the high frequency deflecting operation of a horizontal deflection coil by winding a vertical deflection coil constituting a deflection yoke in a plurality of coil grooves formed on the internal surface of a magnetic core in an axial direction. CONSTITUTION:The lead wire of a vertical deflection coil 2 wound about each half body of a magnetic core 1 is applied precisely at the predetermined winding position with the predetermined winding distribution via a winding groove 4 formed axially on the internal surface of the core 1 and winding guides 7 and 7' at the side of front and rear end openings thereof. According to the aforesaid construction, a magnetic shield effect due to the core 1 is obtained and eddy current generated in the vertical deflection coil 2 with a horizontal defection magnetic field is reduced, thereby reducing a loss in generated Joule heat. The heat generation of the horizontal deflection coil 1 associated therewith drops consequently.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a deflection yoke used in 111i definition color cathode ray tube receivers and the like, and particularly to a deflection yoke optimal for high frequency deflection.

<Prior art> Fig. 2 shows a conventional example, in which Fig. 2(a) is a cross-sectional view of a main part of a deflection yoke, Fig. 2(b) is a perspective view of a vertical deflection coil toroidally wound around a magnetic core, and Fig. 2(b) is a perspective view of a vertical deflection coil toroidally wound around a magnetic core. ! I(c) is same figure(b)
FIG. 3 is a cross-sectional view of the magnetic core taken along line D to D'.

In the figure, 1' is a half magnetic core (hereinafter referred to as core) that constitutes a truncated cone-shaped magnetic core with one end having a small diameter and the other end having a large diameter. Each coil 2 is toroidally wound. 3 is a horizontal deflection coil wound in a saddle shape, and 5 is a separator made of insulating resin.

In the case of a deflection yoke having such a configuration, when a high frequency deflection ffi current flows through the horizontal deflection coil 3, a vortex is generated in the vertical deflection coil 2 due to the horizontal deflection magnetic field generated from the horizontal deflection coil 3. Ii flow, resulting in Joule heat loss. This Joule heat loss becomes larger as the horizontal deflection frequency becomes higher, and the amount of heat generated by the vertical deflection coil 2 increases, leading to an increase in the temperature of the horizontal deflection coil 31 and the entire deflection yoke.

Therefore.

In order to reduce Joule heat loss caused by eddy currents generated in the vertical deflection coil by such high-frequency horizontal deflection magnetic fields, horizontal deflection coils have been conventionally used.

Changing the conductor wire of the vertical deflection coil from a solid wire to a stranded conductor such as Lindt wire, or changing the core material (An-Z
Methods such as changing the n-Mg system to the Mn-Zn system have been adopted.

<Problem to be solved> However, even when the above measures are taken, when the horizontal deflection frequency reaches a high frequency range of, for example, 64 to
It also reaches deg. Therefore, when the operating temperature and environmental condition is 40 DEG C., the temperature inside the device reaches 80 DEG to 90 DEG C., which poses a problem in reliability during use. Furthermore, when the horizontal deflection frequency is 90 klb or when double-speed horizontal deflection with a horizontal deflection frequency of 33 convex is performed using a +10" wide-angle deflection picture tube, the temperature rise within the horizontal deflection coil device will be 50 to 60 deg. In order to solve these problems, measures have been taken to forcibly cool the deflection yoke using a cooling fan. , attaching a cooling fan to a display device, etc.
The present invention was developed in view of these drawbacks, and is not a sufficient solution since it increases the power consumption of the device and generates noise, and the problem of the reliability of the fan itself remains. The present invention aims to provide a highly reliable display 5A arrangement by suppressing the temperature rise during high-frequency deflection operation of the deflection coil.

<Means for Solving> The mounted deflection coil constituting the deflection yoke is arranged at a predetermined pitch in the circumferential direction of each half of the magnetic core of a cylindrical or truncated conical core that can be divided into two, and The vertical deflection coil is wound with a predetermined winding distribution in multiple winding grooves provided in the axial direction of the inner circumferential surface between the front end and rear end openings to magnetically shield the deflection magnetic field generated from the horizontal deflection coil. Vortex m generated in the coil
It is constructed to suppress the flow.

<Operations and Examples> Hereinafter, an example of the present invention will be described based on the drawings. 1st
The figure shows an embodiment of the present invention, in which figure (8) is a cross-sectional view of a main part of a deflection yoke according to the present invention, figure (b) is a perspective view of a magnetic core that can be divided into two, which is a feature of the present invention, The same figure (c) is a view of the core seen from the front end opening side B in the same figure (b), and the same figure (d) is a partial sectional view of the core taken along the line ＠(C)^-A'. 1 is a half core that is divided into two parts, and windings extending in the axial direction of the inner peripheral surface between the front end opening side B and the rear end opening side C, and provided at a predetermined pitch in the circumferential direction of the core. Line grooves 4 are formed. 2 is a vertical deflection coil;
3 is a horizontal deflection coil, 6 is a core dividing groove, and 7.7' is a winding guide groove provided on the front end opening side 8 and the rear end opening side C of the core, respectively. The conductors of the vertical deflection coils 2 wound around the core 1 of each half are arranged in a winding groove 4 provided in the axial direction on the inner circumferential surface of the core, and a winding guide groove 7 on the front and rear end opening sides. 7' allows the winding to be placed precisely at the predetermined position.
It is toroidally wound with a predetermined winding distribution. It goes without saying that the vertical deflection coil is not limited to toroidal winding, but may be wound in stator style.

<Effects> As described above, since the deflection yoke of the present invention is configured such that the overlapping deflection coil is wound and housed in a predetermined winding groove provided in the axial direction of the inner circumferential surface of the core, The magnetic shielding effect achieved by the core reduces the influence of the high-frequency horizontal deflection magnetic field on the vertical deflection coil, reducing the eddy current that previously occurred in the vertical deflection coil due to the horizontal deflection magnetic field, and reducing the Joule heat loss that occurs. Therefore, the heat generated by the horizontal deflection coil is reduced. Also, according to the present invention,
The vertical deflection coil conductor is wound within the groove on the inner circumferential surface of the core and does not protrude beyond the inner circumferential surface of the core, making it possible to use a core with a smaller inner diameter than before, improving deflection sensitivity and reducing deflection power. is significantly reduced. Furthermore, as a result of assembling the core and the horizontal deflection coil closer to each other, thermal conductivity from the horizontal deflection coil to the core increases, and the heat dissipation effect by the core also increases. Furthermore, since the core can be divided into two parts, the vertical deflection coil can be created using a conventional vertical toroidal winding machine, without using a special winding machine, to prevent winding distribution due to line drawing or misalignment of the winding position. It is possible to wind the wires with a predetermined winding distribution with a good 9 degrees without any variation, and it has the effect of improving the precision of color shift and raster distortion.

[Brief explanation of the drawing]

1 [J shows one embodiment of the present invention, FIG. ) is a view of the core seen from the front end opening side n in the same figure (b), and the same figure (d) is a view of the same figure (
A partial sectional view taken along the ^-A' line of C). Figure 2 shows a conventional example, where (a) is a cross-sectional view of the main part of the deflection yoke, (b) is a perspective view of a vertical deflection coil toroidally wound around the core, and (C) is the same figure. (b) D-D
FIG. 1; I': g-core, 2: vertical deflection coil, 3: horizontal deflection coil, 4: winding groove, 5: separator. 6: Split guide groove, 7i7': Winding guide groove Figure 1 (a) (bl (C)

Claims (1)

[Claims] A deflection yoke comprising a horizontal deflection coil and a vertical deflection coil, the vertical deflection coil being wound around a magnetic core having a cylindrical shape or a truncated conical shape with one end having a small diameter and the other end having a large diameter; The magnetic core is configured to be able to be divided into two parts, and a plurality of winding grooves are formed at a predetermined pitch in the circumferential direction in the axial direction of the inner circumferential surface of each of the two halves of the magnetic core, and A deflection yoke characterized in that a vertical deflection coil is wound in the winding groove so as to magnetically shield a deflection magnetic field generated from the horizontal deflection coil, thereby suppressing eddy current generated in the vertical deflection coil.