JPH0454674Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a deflection yoke that aims to reduce the level of unnecessary radiation, and more particularly, to a deflection yoke that is equipped with an auxiliary coil that reduces the level of unnecessary radiation.

[Prior art] For example, West German VDE (Verband Deutscher
The unnecessary radiation regulation frequency required by the (Elektorotechniker) standard is 10KHz or higher, and unnecessary radiation generated by horizontal deflection current becomes a problem in cathode ray tube display devices.

Unnecessary radiation is caused by the deflection yoke through which the horizontal deflection current flows, the flyback transformer, the horizontal width adjustment coil,
This is caused by leakage magnetic flux from the horizontal linearity adjustment coil, but of the amount of unnecessary radiation to the outside, the deflection yoke accounts for approximately 70%, the flyback transformer accounts for approximately 20%.
Other horizontal width adjustment coils account for approximately 10%.

FIG. 5 is a partially exploded perspective view of a cathode ray tube display device equipped with a conventional unnecessary radiation prevention device, in which 1 is a chassis, 2 is a cathode ray tube, 3 is a deflection yoke, and 4 is a flyback transformer (hereinafter abbreviated as FBT). ).
Unnecessary radiation sources such as a horizontal width adjustment coil (not shown) are surrounded by a heat sink 5, cover 6', and chassis 1 made of a highly conductive metal plate or magnetic material, and are surrounded by a deflection yoke 3, FBT, etc. By confining leakage magnetic flux radiated from the components through which the horizontal deflection current flows, the level of unnecessary radiation to the outside was reduced.

[Problems to be solved by the invention] Conventional unnecessary radiation prevention devices have a structure in which a magnetic shielding plate surrounds the source of unnecessary radiation, which not only imposes large restrictions on the structure of the display device, but also There is a problem with poor heat dissipation,
Another problem was that the cost was high.

This idea was made to solve the above problems, and without surrounding it with a magnetic shielding plate,
The purpose is to obtain a deflection yoke with a low level of unnecessary radiation.

[Means for Solving the Problems] The deflection yoke according to this invention has an auxiliary coil formed in a hollow shape, and a first coil formed in a position along the front and rear crossing lines of the horizontal deflection coil of the separator. , a second coil holding part and a coil locking part provided near at least one of these holding parts to hold the horizontal deflection coil in a posture along the horizontal deflection coil, and to hold the horizontal deflection coil horizontally along the auxiliary coil. The structure is such that a deflection current is applied.

[Function] In this device, the leakage magnetic flux of the deflection yoke is reduced by the magnetic flux generated by the auxiliary coil, which is stably held in a posture along the horizontal deflection coil by the holding part and the locking part formed on the separator. This reduces unnecessary radiation levels.

[Embodiment of the invention] Figure 1 is a side view showing an embodiment of the invention.
7 is a ferrite core, 7a is a core clip, 8 is a toroidal-shaped vertical deflection coil, and 9 is a separator, inside of which a square-shaped horizontal deflection coil (not shown) is installed. 9a is the front end of the separator that covers the outside of the front crossover wire of the horizontal deflection coil; 9b is the rear end of the separator that covers the outside of the rear crossover wire of the horizontal deflection coil; 10a and 10b are the rear ends of the separator that covers the outside of the front crossover wire of the horizontal deflection coil; Front end 9a, rear end 9
The first and second holding portions are respectively formed in b, and in this example, are grooves formed in the outer circumferential surface. Reference numeral 11 denotes locking portions, and in this example, two locking portions are provided following the first and second holding portions 10a and 10b. FIG. 2 is a side view of the structure of this locking portion as viewed from the line in FIG. 1, and FIG. 3 is a perspective view of the locking member. It is composed of a housing part 11a and a locking member 11b formed of, for example, a synthetic rubber molded product, and the locking claw 11d of the locking member 11b locks the housing part 11.
It is configured to be hooked onto the stepped portion 11c of a. 12 is an auxiliary coil, which is horizontal deflection coil 3~
It is formed in a square shape with 10% of the number of turns, and the front and rear coil sides 12a and 12b are the first and second coil sides, respectively.
It is housed in the second holding parts 10a, 10b, and the front and rear ends of the left and right coil sides 12c are housed in the holding part 11a and fixed by locking members 11b. As a result, the auxiliary coil 12 is positioned such that the front and rear coil sides 12a and 12b are along the front and rear crossover lines of the horizontal deflection coil, respectively, and the left and right coil sides 12c are in a position where they do not come into contact with the core clip 7a or the like. However, it is held in fixed possession.

Further, the auxiliary coil 12 is connected in series or parallel with the horizontal deflection coil, and is supplied with a horizontal deflection current.

FIG. 4 is a diagram for explaining the action of the auxiliary coil 12, and is a side view of the deflection yoke with the vertical deflection coil and separator removed. In the figure, 13
13a is a horizontal deflection coil, and 13a is a front crossover wire portion thereof, and 13b is a rear crossover wire portion thereof. When a horizontal deflection current is applied to the horizontal deflection coil, a leakage magnetic flux is generated in the direction indicated by a broken line arrow 14. On the other hand, on the coil sides 12a and 12b before and after the auxiliary coil, magnetic flux is generated in the direction indicated by the dashed-dotted arrow 15, thereby reducing the leakage magnetic flux 14 and reducing the level of unnecessary radiation.

In this embodiment, an example was shown in which the horizontal deflection current was applied with the polarity such that the direction of the magnetic flux 15 generated by the auxiliary coil 12 was opposite to that of the leakage magnetic flux 14. Since the level of unnecessary radiation may be reduced by using the power source, it is necessary to change the polarity of the current while measuring the level of unnecessary radiation, and connect the polarity with the polarity that lowers the level of unnecessary radiation.

In the above embodiment, the locking portions 11 are provided at two locations following the first and second holding portions 10a and 10b of the separator 9, but the locking portions 11 may be provided at either one of the locations.

Further, although an example has been shown in which the holding portions 10a and 10b are formed on the outer peripheral surfaces of the front end 9a and the rear end 9b of the separator, respectively, they may be formed on the side surfaces.

Furthermore, although an example has been shown in which the holding parts 10a and 10b are formed with grooves, a plurality of protrusions formed at appropriate intervals can also be used to form the coil side 1 of the auxiliary coil 12.
2a and 12b may be hooked together.

[Effects of the invention] As explained above, this invention stably holds the auxiliary coil, which is formed in a hollow shape, in a posture along the horizontal deflection coil using the holding part and the locking part provided on the separator. This eliminates the risk of the auxiliary coil coming into contact with core clips, etc. and damaging the insulation, and the auxiliary coil is held in an accurate position, resulting in a deflection yoke with low unnecessary radiation levels and little fluctuation. There are benefits to be gained.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of this invention, Fig. 2 is a diagram showing the structure of the locking part seen from the line of Fig. 1, and Fig. 3 is a perspective view of the locking member constituting the locking part. , Fig. 4 is a side view of the deflection yoke with the ferrite core and vertical deflection coil removed to explain the action of the auxiliary coil, and Fig. 5 is a partially exploded view of a cathode ray tube device equipped with a conventional unnecessary radiation prevention device. FIG. 3...Deflection yoke, 9...Separator, 9a...
...Front end, 9b...Rear end, 10a, 10b
... Holding part, 11 ... Locking part, 12 ... Auxiliary coil, 12a ... Front coil side, 12b ... Rear side coil side, 12c ... Left and right coil sides, 13 ...
...Horizontal deflection coil, 13a...front side crossing line part,
13b... Rear side crossing line part. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] An auxiliary coil is formed in a hollow shape that is almost the same shape as the horizontal deflection coil and is connected in series or parallel with the horizontal deflection coil, and an auxiliary coil is formed at the front end of the separator and the front side of the auxiliary coil is connected to the horizontal deflection coil. a first coil holding part that holds the coil at a position along the front crossover line; and a first coil holding part that is formed at the rear end of the separator and holds the rear coil side of the auxiliary coil at a rear crossover line of the horizontal deflection coil; a second coil holding part that is held at a position along the auxiliary coil; and a locking part that is formed near at least one of the first and second coil holding parts and that locks the left and right coil sides of the auxiliary coil. A deflection yoke comprising: