JPH0139383Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a dynamic differential coil used for correcting misconvergence in an in-line color television receiver.

[Prior art]

In general, in color television receivers, the horizontal deflection coil of the deflection yoke attached to the receiver is asymmetrical, which causes relative positional deviations of the beams R and B, causing the upper and lower corners of the screen to Misconvergence of forward or reverse crosses may occur.

In order to correct such misconvergence, a differential coil has conventionally been used as shown in FIG. 7. The differential coil according to this prior art includes a differential coil 33 connected in series to one side of a pair of horizontal deflection coils 31 and 32 constituting a deflection yoke, and a movable core movably provided on the differential coil 33. 34, each horizontal deflection coil 31, 32
A horizontal deflection current terminal 35 is connected to one side, and another horizontal deflection current terminal 36 is connected to the midpoint of the differential coil 33, and the movable core 34 is connected to the seventh
By moving in the direction of arrow 37 in the figure, one horizontal deflection coil 31 and the other horizontal deflection coil 32 are moved.
The misconvergence is corrected by changing the ratio of current flowing through the

However, since this differential coil correction is performed uniformly over the entire screen, it is not possible to correct for misconvergence that increases vertically from the center of the screen. A dynamic differential coil with a control winding (V coil) that changes direction according to the deflection period is required.

However, conventional television receivers to which the above-mentioned dynamic differential coil is applied are single-function receivers that only display images of received broadcasts. Therefore, there is no need for an external insulating chassis for the entire television receiver, and there is no need for the deflection yoke, flyback transformer, dynamic differential coil, etc. to be individually insulated.

However, recent television receivers are used as so-called multi-functional receivers, in addition to their original broadcast video function, they also serve as video tape recorder video devices, personal computer display devices, and other video functions. It has become like that. For this reason, if the television receiver itself does not have an insulating structure, there is a risk of damaging peripheral devices connected to it, such as video tape recorders and personal computers, and safety standards may not be met. Can not.

Therefore, when a television receiver is used as a multifunctional receiver, the dynamic differential coil must have an insulating structure similar to the deflection yoke, flyback transformer, etc.

However, the differential coil 33 according to the prior art is equipped with a movable core 34 and has a mechanically movable part.
Another drawback was that dynamic convergence correction was not possible. [Problems to be solved by the invention] The present invention has been devised in view of the problems of the prior art described above. The object of the present invention is to provide a dynamic differential coil in which an insulation gap according to safety standards can be secured between the horizontal coil and the vertical coil, and the insulating bobbin can be easily attached. .

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides first and second drum cores each having a large-diameter flange at both ends and an intermediate flange having a smaller diameter than each of the large-diameter flange at an intermediate portion; A pair of horizontal coils wound so that magnetic fields are generated in opposite directions between the intermediate flange of the drum core and each large-diameter flange, and between the intermediate flange of the second drum core and each large-diameter flange. Another pair of horizontal coils are wound so that magnetic fields are generated in opposite directions, and the outer periphery of each drum core and each pair of horizontal coils is wound with each pair of horizontal coils wound around each drum core. an oblong drum-shaped insulating bobbin made up of a pair of half-drum-shaped bobbin members mounted so as to surround the insulating bobbin; and a drum-shaped insulating bobbin wound around the outer periphery of the insulating bobbin so as to face each pair of horizontal coils. a vertical coil, and a first
The first drum core has a magnetic field oriented in one direction, and the second drum core has a magnetic bias magnet arranged so that a magnetic field is oriented in the opposite direction.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 6.

In the drawing, reference numeral 1 denotes a first drum core, and the drum core 1 has large diameter flanges 1A and 1B at both ends, and a diameter approximately half of these diameters in the middle of each of the large diameter flanges 1A and 1B. The intermediate collar 1C is connected to the large diameter collars 1A and 1B by small diameter rod-shaped parts 1D and 1E. The drum core 1 has horizontal coil winding portions 2A and 2B formed in a concave ring shape located between the intermediate collar 1C and the large diameter collars 1A and 1B.
(see figure).

3 is a second drum core, and this drum core 3 also has large diameter flanges 3A, 3B at both ends, and has a diameter approximately half of these diameters at the middle part of each of the large flanges 3A, 3B. It has an intermediate flange 3C, and the intermediate flange 3C and the large-diameter flanges 3A, 3B are connected by small-diameter rod-shaped portions 3D, 3E. and,
The drum core 3 also has an intermediate flange 3C and a large diameter flange 3A,
3B, the horizontal coil winding parts 4A, 4
B is formed in a concave ring shape.

5A and 5B are a pair of horizontal coils wound around horizontal coil winding parts 2A and 2B, respectively, and each horizontal coil 5A and 5B is a pair of horizontal coils that are connected in series with the winding directions reversed as shown in FIG. The connection direction is either connected or connected in series by changing the connection of wires with the same winding direction as shown in FIG. As a result, when the horizontal coils 5A, 5B are energized, the magnetic field φH,
The configuration is such that φH occurs in opposite directions.

6A and 6B are another pair of horizontal coils wound around the horizontal coil winding parts 4A and 4B, respectively, and the horizontal coils 6A and 6B are also connected to the horizontal coils 5A and 5.
Similarly to B, it is wound as shown in Figure 4 or Figure 5,
When the horizontal coils 6A, 6B are energized, magnetic fields φH, φH are generated in the drum core 3 in opposite directions from the intermediate collar 3C toward the large diameter collars 3A, 3B.

7 is each pair of horizontal coils 5A, 5B, 6A,
6B and a vertical coil 11, which will be described later, and between these and drum cores 1 and 3. ,5B,6A,6
B is wound and attached to the outer periphery of these in almost intimate contact. Therefore, the insulating bobbin 7 is composed of a pair of half-drum-shaped bobbin members 8 and 9. Here, one bobbin member 8 has large diameter U-shaped parts 8A, 8B surrounding the outer periphery of each large diameter collar 1A, 1B of the drum core 1, and a small diameter U-shaped part surrounding the outer periphery of the horizontal coils 5A, 5B and intermediate collar 1C. Part 8C
and the bobbin member 8 is formed so as to overlap the other bobbin member 9 (second
(see figure). The other bobbin member 9 also has large diameter V-shaped portions 9A, 9B surrounding the outer peripheries of the large diameter flanges 3A, 3B of the drum core 3, and small diameter U-shaped portions 9C surrounding the outer peripheries of the horizontal coils 6A, 6B and the intermediate flanges 3C. and a positioning protrusion 9 in which the large diameter U-shaped portions 8A, 8B of the bobbin member 8 come into contact with the inner peripheral surfaces of the large diameter U-shaped portions 9A, 9B.
D, 9D, 9E, and 9E, and the bobbin member 9 is also formed to overlap one bobbin member 8. Further, in each of the bobbin members 8 and 9, one bobbin member 8 is a male type, and the other bobbin member 9 is a male type.
is a female type, and therefore the large diameter U-shaped portion 8A,
8B is formed smaller than the large diameter U-shaped parts 9A and 9B by the thickness of the plate, and the small diameter U-shaped part 8C is also formed smaller in diameter than the small diameter U-shaped part 9C by the thickness of the plate, and is longer in the axial direction by the thickness of the plate. ing. Thus, the bobbin member 8,
9 is assembled to form the insulating bobbin 7, the small diameter U-shaped portions 8C, 9C and the large diameter U-shaped portions 8A, 8 are assembled.
A vertical coil winding portion 10 is formed in a concave elliptical shape between B, 9A, and 9B (see FIG. 3).

Reference numeral 11 denotes a vertical coil wound around the vertical coil winding section 10, and by passing a current through the vertical coil 11, the inside of the drum cores 1 and 3 is moved from the large-diameter flanges 1A to 1B, and from 3A to 3A, as shown in FIG. 3B, each of which is configured to generate a magnetic field φV.

Further, reference numerals 12 and 13 indicate magnetic bias magnets provided on the end surfaces of the large diameter portions 1A and 1B of the drum core 1 so as to face each other.
The S pole of one magnet 12 and the N pole of the other magnet 13 face each other, creating a magnetic field φM in the opposite direction to φV. On the other hand, reference numerals 14 and 15 designate other magnetic bias magnets disposed on the end faces of the large diameter portions 3A and 3B of the drum core 3 so as to face each other.
15, the N pole of one magnet 14 and the S pole of the other magnet 15 face each other, forming a magnetic field φM in the same direction as φV.

In FIGS. 4 and 5, 16 is a horizontal deflection coil of a deflection yoke consisting of coils 16A and 16B, 17 and 18 are deflection current terminals, and 19 and 20 are
indicates the correction current terminal.

The present embodiment is constructed as described above, but the first drum core 1 is biased just before magnetic saturation by the magnetic bias magnets 12 and 13, and the second drum core 1 is biased by the other magnetic bias magnets 14 and 15. The drum core 3 is biased just before magnetic saturation. In this state, a deflection current is applied to the horizontal coils 5A, 5B, 6A, and 6B, and the magnetic field φH is applied to each drum core 1, 3.
are generated in opposite directions to each other, and a sawtooth correction current with a vertical period is caused to flow through the vertical coil 11 to generate a magnetic field φV. At this time, horizontal coils 5A, 5B, 6
There is no magnetic coupling between A, 6B and the vertical coil 11. As a result, the two pairs of horizontal coils 5A, 5 are connected to the vertical coil 11 by the correction current.
B, 6A, and 6B change differentially, and this causes a difference in the deflection current flowing between each coil 16A and 16B of the horizontal deflection coil 16, causing a difference between the top and bottom of the screen of an in-line color television receiver. Beams R and B at both corner portions move in the vertical direction, and horizontal crosses at the screen corner portions are corrected.

Therefore, in this embodiment, the horizontal coils 5A, 5B,
6A, 6B and the vertical coil 11 are insulated by the insulating bobbin 7, and the outer peripheral surfaces of the intermediate flanges 1C, 3C of the drum cores 1, 3 and the large diameter flanges 1A, 1B, 3
A sufficient insulation distance from the outer peripheral surfaces and inner end surfaces of A and 3B can be provided, and an insulation structure that complies with safety standards can be achieved. Furthermore, since the bobbin members 8 and 9 constituting the insulating bobbin 7 are assembled so as to overlap each other, a sufficient insulation distance from the joint or abutting portion of the two can be ensured. moreover,
Since the insulating structure only needs to be assembled with the bobbin members 8 and 9, the structure is simple, the assembly work can be easily performed, and automatic assembly can be made possible.

In the embodiment, the magnetic bias magnets include two pairs of magnets 12, 13, 14, and 14 for each drum core 1, 3.
15, but as shown in FIG. 6, a pair of magnets 21,
22, and the magnets 21 and 22 may be magnetized as shown.

Further, in the embodiment, each bobbin member 8, 9 is illustrated so as to cover the outer peripheral surface of the magnetic bias magnets 12, 13, 14, 15, but it is not necessary to cover each of the magnets 12, 13, 14, 15.
There is no need to cover 2, 13, 14, and 15.

Further, a configuration may be adopted in which pins for winding the coil start wires or end wires of the coils 5A, 5B, 6A, 6B, 11, etc., connection terminals, etc. are attached to each bobbin member 8, 9 of the embodiment.

Further, in the embodiment, positioning projections 9D and 9E are formed on the bobbin member 9, but these may be formed as necessary.

[Effect of idea]

The dynamic differential coil according to the present invention is as described in detail above, and has a structure in which an insulating bobbin is inserted between the horizontal coil and the vertical coil to maintain an insulating interval between the two, so that it can be easily It is possible to manufacture dynamic differential coils with an insulated structure that complies with safety standards.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the dynamic differential coil according to this embodiment, and FIG. 2 is a cross-sectional view in the direction indicated by the - arrow in FIG. Fig. 3 is an exploded perspective view showing each drum core and insulating bobbin, Fig. 4 is a circuit diagram showing the winding state of each coil, Fig. 5 is a circuit diagram showing a modification of the winding state of each coil, and Fig. 6 is a circuit diagram showing a modified example of the winding state of each coil. The figure is a longitudinal sectional view showing a modification of the dynamic differential coil, and FIG. 7 is a circuit diagram showing a conventional technique. 1, 3...Drum core, 1A, 1B, 3A, 3
B...Large diameter tsuba, 1C, 3C...Intermediate tsuba, 5A, 5
B, 6A, 6B... Horizontal coil, 7... Insulating bobbin, 8, 9... Bobbin member, 11... Vertical coil, 12, 13, 14, 15, 21, 22... Magnetic bias magnet.

Claims (1)

[Scope of utility model registration request] A first and a second collar each having a large-diameter collar at both ends, and an intermediate collar having a smaller diameter than each of the large-diameter collars at an intermediate portion.
a pair of horizontal coils wound so that magnetic fields are generated in opposite directions between the middle collar and each large diameter collar of the first drum core; and the second drum core.
Another pair of horizontal coils are wound so that magnetic fields are generated in opposite directions between the middle collar and each large diameter collar of the drum core, and each pair of horizontal coils is wound around each of the drum cores. an oblong drum-shaped insulating bobbin made of a pair of half-drum-shaped bobbin members, which is attached so as to surround the outer periphery of each drum core and each pair of horizontal coils; A vertical coil is wound to face each pair of horizontal coils, and a magnetic field is oriented in one direction in the first drum core, and a second
A dynamic differential coil consisting of a magnetic bias magnet arranged so that the magnetic field is directed in the opposite direction in the drum core.