JPH0448618Y2 - - 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. 8 to 10 show a conventional deflection yoke 1 of 1.
Give an example. In each figure, 2 is a saddle-shaped horizontal deflection coil;
3 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. 11, 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. 9, 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 as shown by reference numeral 9 from the divergence part 7c, thereby preventing screen distortion. It functions to correct.

Problems to be Solved by the Invention As shown in FIG. 11, magnetic fluxes φ _H1 and φ _H2 flow around the flange portion 2a of the horizontal deflection coil 2.
Here, the transmission portion 7b of the cross arm magnetic body 7 is in close contact with the outer surface of the front portion 4b of the separator 4, and is close to the front flange portion 2a of the horizontal deflection coil 2 by about 1 mm. 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 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 7b)
Distance to 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. 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 the coils 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 configuration in which the cross arm magnetic body is provided apart from the front part of the coil separator with a space between the cross arm magnetic body and the front part of the coil separator.

Effect With this configuration, the cross-arm magnetic body is separated from the front flange of the horizontal deflection coil, and the number of magnetic fluxes interlinked with the cross-arm magnetic body among the magnetic flux generated from the front flange of the horizontal deflection coil is reduced. The amount of Joule heat caused by the current is suppressed, and the temperature rise of the cross arm magnetic body is suppressed.

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. 8 to 11 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. 8 to 11 are designated by the same reference numerals with a suffix A added thereto.

As shown in FIGS. 2 and 3, the coil separator 4A has a flange portion 4c and a ring portion 4d each having a height h as a space forming portion.
Ribs 4e and 4f are formed. Locking groove 4g
is formed on the step portion 4h that protrudes from the flange portion 4c.

The cross arm magnetic body 7 connects the tongue portion 7a- ₁ formed extending from the magnetic flux absorbing portion 7a to the locking groove portion 4.
It is attached by engaging with g. Magnetic flux transmission part 7b
Of these, the flange portion 7b- ₁ is in contact with the top of the rib 4e, the peripheral wall portion 7b- ₂ is in contact with the top of the rib 4g, and the magnetic flux transmission portion 7b and the front portion 4 of the separator 4 are in contact.
Spaces 11 and 12 having an interval equal to the height dimension h of the ribs 4e and 4g are formed between the outer surface of the ribs 4e and 4g.

Here, the effects of the spaces 11 and 12 will be explained with reference to FIG. 4.

Magnetic fluxes φ _H1 and φ _H2 flow around the 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
and the peripheral wall portion 7b- ₂ are the front portion 4 of the separator 4, respectively.
It is spaced apart by a dimension h from the flange portion 4c and ring portion 4d of b. 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 , and only a portion of the magnetic fluxes flow through the flange portion 7b-1 and the surrounding wall portion 7b-2.
_-1 and the surrounding wall portion 7b- ₂ . This results in
The joule heat generated in the flange portion 7b- ₁ and the peripheral wall portion 7b- ₂ 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.

The inventor of the present invention changed the dimensions A and B in Fig. 4 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. 5 shows a deflection yoke 20 of another embodiment of the present invention.
shows. In the figure, parts that are the same as those shown in FIGS. 1 and 2 are designated by the same reference numerals, and substantially the same parts are designated by the suffix A.

7A is a cross arm magnetic body, and as shown in FIG. 6, there are bent pieces 7d as space forming parts at both ends of the magnetic flux transmitting part 7b, that is, both ends of the flange part 7b- ₁ , and both ends of the peripheral wall part 7b- ₂ . A bent piece 7e is formed as a space forming portion. Tongue piece 7a
_-1 is formed at the tip of the extending arm portion 7a- ₂ .

As shown in FIGS. 5 and 7, this cross arm magnetic body 7B has tongue pieces 7a- ₁ connected to the separator 4.
The bent pieces 7d and 7e are engaged with the locking groove 4g of the front part 4b and the flange part 4c and the ring part 4d, respectively.
It is installed in contact with the These bent pieces 7d and 7e create a space 21 between the flange portion 7b- ₁ and the flange portion 4c, and a peripheral wall portion 7b- _2.
A space 22 is formed between the flange portion 4c and the ring portion 4d, and the flange portion 7b- ₁ and the peripheral wall portion 7b- ₂ are spaced apart from the flange portion 4c and the ring portion 4d, respectively. As a result, similarly to the deflection yoke 10 of the above embodiment, the number of interlinkages of the magnetic fluxes φ H1 and φ _H2 with respect to the flange portion 7b- ₁ and the peripheral wall portion 7b _{-2 is} small, and temperature rise is suppressed.

It goes without saying that the structure for forming a space between the cross arm magnetic body and the coil separator is not limited to the ribs 4e, 4f and the bent pieces 7d, 7e of the above embodiment.

Effects of the Invention As mentioned above, according to the deflection yoke of the present invention, since the cross arm magnetic body is attached with a space formed between it and the coil separator, the magnetic flux from the horizontal deflection coil is reduced. Of these, the number that interlinks with the cross arm magnetic material can be reduced, which reduces the amount of heat generated by eddy currents, suppressing the temperature rise of the cross arm magnetic material, and improving the quality of the material of the component parts. It is possible to guarantee the reliability of the deflection yoke without any effort, and since the cross arm magnetic material does not get very hot when touched, 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, and FIGS. 2 and 3 are views showing how the cross arm magnetic body in FIG. 1 is attached to the coil separator, respectively. 4 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 transmission part of the cross arm magnetic body in the deflection yoke of FIG. 1, and FIG. FIG. 6 is a perspective view with a partial cutaway of another embodiment of the deflection yoke, FIG. 6 is a perspective view of the magnetic body of the cross arm in FIG. 8 is a front view showing an example of a conventional deflection yoke, and FIGS. 9 and 10 are longitudinal sectional views and front openings of the deflection yoke shown in FIG. 4, respectively. FIG. 11, a left side view seen from the side, is a diagram showing how the magnetic flux from the flange portion of the horizontal deflection coil in FIG. 9 interlinks with the magnetic flux transmission portion of the cross arm magnetic body. 2... Horizontal deflection coil, 3... Vertical deflection coil, 4, 4A... Coil separator, 4b... Front part, 4c... Flange part, 4d... Ring part, 4
e, 4f...rib, 4g...locking groove, 4h...
Stepped portion, 7, 7A...Cross arm magnetic body, 7a...
...magnetic flux absorption part, 7a- ₁ ...tongue, 7a- ₂ ...extending arm part, 7b ...magnetic flux transmission part, 7b _-1 ...flange part, 7b- ₂ ...peripheral wall part, 7c ...magnetic flux Diverging portion, 7d, 7e...Bending piece, 10, 20...Deflection yoke, 11, 12, 21, 22...Space.

Claims (1)

[Claims for Utility Model Registration] A saddle-shaped horizontal deflection coil, a coil separator located outside the horizontal deflection coil, a toroidal vertical deflection coil disposed outside the coil separator, and the vertical deflection coil. In the deflection yoke, the deflection yoke has a cross-arm magnetic body consisting of a magnetic flux absorption part that absorbs leakage magnetic flux from the coil separator, a magnetic flux transmission part that transmits the absorbed magnetic flux, and a magnetic flux divergence part that diverges the transmitted magnetic flux. Alternatively, the deflection yoke has a structure in which the cross arm magnetic body is provided with a space forming portion, and the cross arm magnetic body is attached with a space formed between the cross arm magnetic body and the coil separator by the space forming portion.