JPH0448620Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a deflection yoke, and more particularly, to a deflection yoke used in a color television receiver or a display device using a color picture tube.

Prior Art FIGS. 4 to 6 show an example of a conventional deflection yoke 1. In each figure, 2 is a saddle-shaped horizontal deflection coil;
4 is a toroidal vertical deflection coil, 4 is a morning glory-shaped synthetic resin coil separator that separates both coils, 5 is a core, and 6 is a core fastener.

The front part (screen side) 4b of the separator 4, which is the opposite side to the neck part 4a, has an annular shape with an L-shaped cross section, and is composed of a flange part 4c and a ring part 4d. The front part of the horizontal deflection coil 2 is a flange part 2a, and this front flange part 2a enters inside the front part 4b of the separator 4.

7 is a cross arm magnetic body, and the magnetic flux absorption part 7
a, and a magnetic flux transmitting portion 7b (consisting of a flange portion 7b- ₁ and a peripheral wall portion 7b- ₂ ) that absorbs and transmits magnetic flux.
and a magnetic flux divergent part 7c. As shown in FIG. 7, this cross arm magnetic body 7 has a magnetic flux transmitting portion 7b attached in close contact with the outer surface of the front portion 4b of the separator 4, and a magnetic flux absorbing portion 7a facing the vertical deflection coil 3. However, the magnetic flux divergent portion 7c is oriented in a predetermined direction.

As shown in FIG. 6, the magnetic flux 8 from the vertical deflection coil 3 is absorbed by the absorption part 7a, passes through the transmission part 7b, and is diverged in a predetermined direction from the divergence part 7c as shown by reference numeral 9, thereby preventing screen distortion. It functions to correct.

Problems to be Solved by the Invention As shown in FIG. 7, magnetic fluxes φ _H1 and φ _H2 flow around the flange portion 2a of the horizontal deflection coil 2.

Here, the coil separator 4 has a flange portion 4
c and the ring portion 4d also have the same thickness as the curved surface portion 4e, approximately 1 mm. Therefore, the magnetic flux transmitting portion 7b of the cross arm magnetic body 7 and the front flange portion 2a of the horizontal deflection coil 2 are close to each other by about 1 mm. Therefore, most of the magnetic fluxes φ _H1 and φ _H2 are transferred to the cross arm magnetic body 7.
It becomes interlinked with

Since the magnetic field formed by these magnetic fluxes φ _H1 and φ _H2 is an alternating magnetic field with a horizontal deflection frequency, an eddy current flows in the part of the transmission part 7b where the magnetic fluxes φ _H1 and φ _H2 interlink, and this causes Joule heat. occurs.

Generally, the eddy current J is expressed by the following formula.

J=-k・1/r・dφ/dt...(1) Here, r: From the magnetic flux generation part to the conductor (transmission part 7
Distance to b) φ: Magnetic flux k: Constant determined by the magnetic permeability of the conductor, etc.

Further, the Joule heat W is expressed by the following formula.

W=∫ρs・Js ²・dS (2) where Js: Eddy current flowing in a certain region S in the conductor ρs: Specific resistance in a certain region S in the conductor.

In order to increase the size and speed of scanning in recent years, it is necessary to increase dφ/dt in equation (1), which increases eddy currents, increases Joule heat,
That is, heat generation becomes a problem.

For example, when a 15-inch picture tube is used and the horizontal deflection frequency is 64 kHz, the temperature rise due to the above-mentioned eddy current in the cross arm magnetic body 7 is as high as 52.0°C. Furthermore, since the temperature inside the display is generally about 60°C, the temperature of the cross arm magnetic body 7 exceeds 100°C, and the synthetic resin separator 4 in contact with it as well as the coatings of each coil 2 and 3 is also adversely affected, and the reliability of the deflection yoke 1 is significantly reduced. In order to maintain reliability, it is conceivable to change the materials of the component parts to ones that are heat resistant, but this would make the deflection yoke expensive.

Furthermore, since the cross-arm magnetic body 7 is hot, assembly and adjustment of the deflection yoke and display must be performed with care not to touch the cross-arm magnetic body 7, which significantly reduces work efficiency.

An object of the present invention is to provide a deflection yoke that solves the above problems.

Means for Solving the Problems The present invention has a structure in which the flange portion and the ring portion that constitute the front portion of the coil separator that accommodates the front flange portion of the horizontal deflection coil inside thereof are thickened.

Function: The thick flange portion and ring portion space apart the front flange portion of the horizontal deflection coil and the magnetic flux transmission portion of the cross arm magnetic body. This reduces the number of magnetic fluxes that interlink with the cross arm magnetic body among the magnetic flux generated from the front flange of the horizontal deflection coil, suppresses the amount of Joule heat generated by eddy currents, and suppresses the temperature rise of the cross arm magnetic body. It will be done.

Embodiment FIG. 1 shows an embodiment of a deflection yoke 10 according to the present invention. In the figure, the same components as those shown in FIGS. 4 to 7 are denoted by the same reference numerals, and the explanation thereof will be omitted. Components that are substantially the same as those shown in FIGS. 4 to 7 are designated by the same reference numerals with a suffix A added thereto.

As shown in FIG. 2, the coil separator 4a has a front portion 4bA that is thicker than other portions. The front part 4bA of the coil separator 4A is
It consists of a flange portion 4cA having a thickness t ₂ several times the thickness t ₁ of the curved surface portion 4e, and a ring portion 4dA having a thickness t ₃ several times the thickness t ₁ of the curved surface portion 4e.
The thicknesses t ₂ and t ₃ are, for example, 4 mm.

The horizontal deflection coil 2 is placed inside the coil separator 4A with the flange surface 2a- ₁ of the front flange portion 2a in contact with the inner surface of the flange portion 4cA and the circumferential surface 2a- ₂ in contact with the inner surface of the ring portion 4dA. It is provided.

The cross arm magnetic body 7 engages the tongue piece 7d with the locking groove 4f of the coil separator 4A, so that the flange part 7b- ₁ , which is the magnetic flux transmission part 7, is connected to the flange part 4.
At c, the peripheral wall portions 7b- ₂ are attached to the ring portions 4d in close contact with each other.

Here, the effects of the thick front portion 4bA, that is, the thick flange portion 4cA and the ring portion 4Ad will be explained with reference to FIG.

Magnetic fluxes φ _H1 and φ _H2 flow around the front flange portion 2a of the horizontal deflection coil 2 as in the conventional case.

However, the flange portion 7b- ₁ of the magnetic flux transmission portion 7b
is spaced apart from the front flange portion 2a by a dimension corresponding to the thickness t ₂ of the thick flange portion 4cA.
The peripheral wall portion 7b- ₂ is connected to the front flange portion 2a,
They are spaced apart by a dimension corresponding to the thickness _t4 of the thick ring portion 4dA.

Therefore, most of the magnetic fluxes φ _H1 and φ _H2 flow without interlinking with the flange portion 7b- ₁ and the peripheral wall portion 7b- ₂ ,
Only a part of it is the flange part 7b- ₁ and the peripheral wall part 7.
Interlinks with b- ₂ . As a result, the flange portion 7b
_-1 and the surrounding wall portion 7b- ₂ , the Joule heat generated is considerably lower than in the past.

As a result, the temperature rise value of the cross arm magnetic body 7 can be suppressed to a lower value than that of the conventional one, and the temperature when used in a television receiver does not affect other components of the deflection yoke 10. The temperature is said to be at a level that does not cause Therefore, the deflection yoke 10 has sufficient reliability even without upgrading the materials of its constituent parts. Also, since the cross arm magnetic body 7 does not get very hot when touched,
Assembly and adjustment of the deflection yoke 10 and the display can also be performed with good work efficiency.

Further, the front flange portion 2a of the horizontal deflection coil 2 is in contact with the inner surface of the front portion 4bA of the coil separator 4A, and the magnetic flux transmitting portion 7b of the cross arm magnetic body 7 is also in contact with the outer surface of the front portion 4bA. These are assembled with high precision.

The inventor of the present invention has proposed the deflection yoke 1 of the above embodiment.
In an experiment conducted at 0, it was found that the temperature rise of the cross arm magnetic body 7 was up to 38 degrees Celsius, and the temperature was suppressed to about 14 degrees Celsius lower than that of the conventional one.

Effects of the invention As described above, according to the deflection yoke of the present invention, both the flange part and the ring part constituting the front part of the coil separator are thick, so that the front flange part of the horizontal deflection coil and the cross section are thick. The magnetic flux transmission part of the arm magnetic body can be arranged with a thickness separation between the flange part and the ring part, thereby reducing the amount of heat generated by Joule heat due to eddy current and suppressing the temperature rise of the cross arm magnetic body. This makes it possible to guarantee the reliability of the deflection yoke without upgrading the material of the component parts.Also, since the cross arm magnetic material does not get very hot when touched, it is easier to assemble and adjust the deflection yoke and display. In addition, since the front flange of the horizontal deflection coil and the magnetic flux transmission part of the cross arm magnetic body can be brought into contact with the inner and outer surfaces of the front part of the coil separator, the horizontal deflection coil and The cross arm magnetic body can be assembled with good dimensional accuracy, and the dimensional accuracy of the assembly is not impaired.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of an embodiment of the deflection yoke of the present invention, and Fig. 2 shows the front flange portion of the horizontal deflection coil and the state in which the cross arm magnetic body is attached to the front portion of the coil separator. 3 is a cross-sectional view showing how the magnetic flux from the front flange of the horizontal deflection coil hardly interlinks with the magnetic flux transmitting part of the cross arm magnetic body in the deflection yoke of FIG. 1, and FIG. A front view showing one example of a yoke, FIGS. 5 and 6 are a vertical cross-sectional view of the deflection yoke in FIG. 4, a left side view as seen from the front opening side, and FIG. 7 is a horizontal deflection coil in FIG. 5. FIG. 4 is a diagram showing how the magnetic flux from the front flange portion of the cross arm interlinks with the magnetic flux transmission portion of the cross arm magnetic body. 2...Horizontal deflection coil, 2a...Front flange portion, 2a- ₁ ...Flange surface, 2a- ₂ ...Surrounding surface,
3... Vertical deflection coil, 4A... Coil separator, 4bA... Front part, 4cA... Flange part, 4
dA...Ring part, 4e...Curved surface part, 7...Cross arm magnetic body, 7a...Magnetic flux absorption part, 7b...
Magnetic flux transmission part, 7b- ₁ ... Flange part, 7b- ₂ ...
...Peripheral wall part, 7c...Magnetic flux divergence part, 10...Deflection yoke.

Claims (1)

[Claims for Utility Model Registration] A coil separator having a front part consisting of a flange part and a ring part, and a saddle-shaped coil separator arranged inside the coil separator with the front flange part located inside the front part. A horizontal deflection coil, a toroidal vertical deflection coil disposed outside the coil separator, a magnetic flux absorption section that absorbs leakage magnetic flux from the vertical deflection coil, a magnetic flux transmission section that transmits the absorbed magnetic flux, and a transmission. A deflection yoke comprising a magnetic flux dispersion section for dispersing the magnetic flux generated by the horizontal deflection coil, and a cross-arm magnetic body attached with the magnetic flux transmission section positioned outside the front section of the coil separator. A deflection yoke having a structure in which the flange portion and the ring portion of the coil separator are made thick so as to separate the front flange portion and the magnetic flux transmission portion of the cross arm magnetic body.