JPH0448619Y2 - - 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. 5 to 7 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.

A 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.
The front flange portion 2a is inserted inside the front portion 4b of the separator 4.

7 is a cross arm magnetic body, and the magnetic flux absorption part 7
a, and a magnetic flux transmission section 7b that transmits the absorbed magnetic flux.
(Composed of flange part 7b- ₁ and peripheral wall part 7b- ₂ )
and a magnetic flux divergent part 7c. As shown in FIG. 8, 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. 8, magnetic fluxes φ _H1 and φ _H2 flow around the flange portion 2a of the horizontal deflection coil 2. Here, the front flange portion 2a of the horizontal deflection coil 2 is in contact with the inner surface of the front portion 4b of the coil separator 4, and the front flange portion 2a is close to the magnetic flux transmission portion 7b of the cross arm magnetic body 7 by about 1 mm. ing. Therefore, most of the magnetic fluxes φ _H1 and φ _H2 interlink with the cross arm magnetic body 7.

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

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

J=-k・1/r・dφ/dφ...(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 increase due to the above-mentioned eddy current in the cross arm magnetic body 7 is as high as 52.0°C. Also, since the temperature inside the display is generally around 60℃, the temperature of the cross arm magnetic body 7 is 100℃.
, and the coatings of the coils 2 and 3 are adversely affected as well as the synthetic resin separator 4 in contact with the separator 4, 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 arranges a horizontal deflection coil and a coil separator with a space formed between the front flange of the horizontal deflection coil and the surface of the coil separator that faces the front flange. The configuration consists of

Effect: Due to the above-mentioned space, the magnetic flux transmission section, which is a portion of the cross arm magnetic body near the front flange of the horizontal deflection coil, is separated from the front flange. 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 parts as those shown in FIGS. 5 to 8 are designated by the same reference numerals, and the explanation thereof will be omitted. Components that are substantially the same as those shown in FIGS. 5 to 8 are designated by the same reference numerals with a suffix A added thereto.

As shown in FIG. 2, the coil separator 4A has a flange portion 4cA having a larger diameter than the conventional one.
Ribs 4e and 4f of height h are formed concentrically on this flange portion 4cA as space forming portions.

The horizontal deflection coil 2 is provided on the inner surface of the coil separator 4a with the flange surface 2a- ₁ of the front flange portion 2a in contact with the ribs 4e and 4f, and the front flange portion 2a and the flange portion 4cA are disposed on the inner surface of the coil separator 4a.
A space 11 with a width corresponding to the height of the ribs 4e and 4f is formed between the front flange portion 2a and a space 12 with a width g between the peripheral surface 2a- ₂ of the front flange portion 2a and the ring portion 4d. There is.

The front flange portion 2a is positioned in contact with the ribs 4e and 4f, and the horizontal deflection coil 2 is mounted with high precision.

The cross arm magnetic body 7 locks the tongue piece 7d into the locking groove 4.
g, and the flange portion 7b- ₁ , which is the magnetic flux transmitting portion 7, is attached to the flange portion 4c, and the peripheral wall portion 7b- ₂ is attached to the ring portion 4d, respectively.

Here, the effects of the spaces 11 and 12 will be explained with reference to FIG. 3.

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 the space 1 above with respect to the front flange portion 2a.
Dimension A is the width of 1 plus the thickness of the flange part 4cA
They are separated. The peripheral wall portion 7b- ₂ is spaced apart from the front flange portion 2a by a dimension B, which is the width of the space 12 plus the thickness of the ring portion 4d.

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,
Assembling and adjusting the deflection yoke 10 and the display can also be performed with good work efficiency.

The inventor of the present invention changed the dimensions A and B in Fig. 3 to 4.
When conducting an experiment with a temperature of about 1.5 mm, it was found that the temperature rise of the cross arm magnetic body 7 was up to 38° C., and the temperature was suppressed to about 14° C. lower than that of the conventional one.

FIG. 4 shows a deflection yoke 20 of another embodiment of the present invention.
The main parts of Components corresponding to those shown in FIG. 1 and FIG. 2 are designated by the same reference numerals, and their explanations will be omitted. The structure of the coil separator 4B is the same as that shown in FIG. 2 except that the ribs 4e and 4f of the coil separator 4A shown in FIG. Spaces 21 and 22 are formed between the flange portion 4cB and the ring portion 4d. This deflection yoke 20 has the same effect as the deflection yoke 10 described above.

Note that the structure for providing a space between the front flange portion of the horizontal deflection coil and the front portion of the coil separator is, of course, not limited to the above embodiment.

Effects of the invention As described above, according to the deflection yoke of the present invention, since the structure is such that a space is provided between the front flange part of the horizontal deflection coil and the flange part and ring part of the coil separator, the cross arm magnetic The magnetic flux transmission part, which is the part of the body closest to the front flange of the horizontal deflection coil, can be placed relatively far from the front flange of the horizontal deflection coil, thereby reducing the heat generated by Joule heat due to eddy currents. It is possible to suppress the temperature rise of the cross arm magnetic material, guarantee the reliability of the deflection yoke without upgrading the material of the component parts, and it is possible to reduce the temperature rise of the cross arm magnetic material. Since it does not get hot, it has the advantage that the deflection yoke and display can be assembled and adjusted with good work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of an embodiment of the deflection yoke according to the present invention, FIG. 2 is a sectional view showing how the front flange of the horizontal deflection coil is attached to the front of the coil separator, and FIG. The figure shows how the magnetic flux from the front flange part 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. 4 shows another example of the deflection yoke according to the present invention. FIG. 5 is a front view showing an example of a conventional deflection yoke, and FIGS. 6 and 7 are views of the deflection yoke of FIG. 4, respectively. The longitudinal sectional view, the left side view seen from the front opening side, and Figure 8 are diagrams showing how the magnetic flux from the front flange of the horizontal deflection coil in Figure 6 interlinks with the magnetic flux transmission part of the cross arm magnetic body. be. 2...Horizontal deflection coil, 2a...Front flange portion, 2a- ₁ ...Flange surface, 2a- ₂ ...Surrounding surface,
3... Vertical deflection coil, 4A, 4B... Coil separator, 4b... Front part, 4cA, 4cB... Flange part, 4d... Ring part, 4e, 4f... Rib, 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,
20... Deflection yoke, 11, 12, 21, 22...
…space.

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 a space is provided between the front flange portion and the flange portion and ring portion of the coil separator.