KR19990020158A - Assembly structure with air-cooled air space of deflection yoke for cathode ray tube - Google Patents

Abstract

The present invention provides an assembly structure having an air-cooled air space of a deflection yoke for a cathode ray tube (CRT).

The assembly having the air-cooled air space fixes the horizontal and vertical deflection coils 22, 26 in the deflection yoke 20 of the cathode ray tube 10 between the outer circumferential wall of the cathode ray tube 10 and the core 28. In the supporting assembly structure 24, at least one air circulation space 49a between the inner and outer walls of the assembly structure 24 and the horizontal and vertical deflection coils 22 and 26 so that air can circulate. Characterized in having a.

According to the configuration according to the present invention, in the deflection yoke using the film-type deflection member including the conducting wire to form a plurality of amperons on the film, to effectively heat the heat generated in the deflection yoke when driving the cathode ray tube By providing the assembly structure having an air-cooled air space for, there is an effect that the reliability of the characteristics of the deflection yoke is increased.

Description

Assembly structure with air-cooled air space of deflection yoke for cathode ray tube

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly structure of a deflection yoke for a cathode ray tube (CRT). Specifically, a deflection yoke using a film type deflection member including a conductor for forming a plurality of amperons on a film may drive a cathode ray tube. The present invention relates to an assembly structure having an air-cooled air space of a cathode ray tube deflection yoke having a structure for effectively generating heat generated by a deflection yoke.

In general, the CRT 10 used in a display device such as a TV is schematically described with reference to the bar shown in FIG. 1, and has a generally narrow cylindrical neck 12 having an electron gun or the like and a generally funnel connected to one side thereof. The funnel 14 in which the inside of the vacuum is made of an alternative shape. The other side of the funnel 14 is formed with a screen 18, which is a screen viewed by the user, and the electron beam e emitted in the Z-axis direction from the electron gun in the neck 12 passes through the shadow mask 16 and the screen 18. Is reached (landing) through the screen 18.

R (red), G (green), and B (blue) electron beams e emitted in the Z-axis direction from the electron gun in the neck 12 are installed on the outer periphery of the portion where the neck 12 and the funnel 14 are connected. The X-axis and the X-axis are formed by the magnetic field in the Y-axis and X-axis directions formed in the funnel 14 by, for example, a sawtooth deflection current flowing through the horizontal and vertical deflection coils 22 and 26 of the deflection yoke 20, which is a deflection device. It is deflected in the Y-axis direction and scanned over the relatively wide screen 18.

Typically, the deflection yoke 20 includes a horizontal deflection coil 22 and a vertical deflection coil 26 for causing the electron beam e to be deflected horizontally and vertically of the screen 18. In addition, the size of the magnetic field is increased. Core 28 and a bobbin 24 that is an assembly structure that is framed so that each component can be assembled to the funnel shape of the funnel 14.

The horizontal deflection coil 22 and the vertical deflection coil 26 include a donut-shaped toroidal type and a saddle-shaped saddle type according to the winding method of the conductive wire, and the horizontal deflection coil 22 has a bobbin 24 and Located between the funnel 14 and saddle type, the vertical deflection coil 26 is located between the bobbin 24 and the core 28 and is a toroidal type or saddle type.

Referring to the bar shown in Figure 2 will be described the conducting structure and the deflection action of the saddle-type deflection coil in general. 2 is a plan view briefly showing, for example, the conductor connecting structure of the saddle type deflection coil constituting the horizontal deflection coil 22 from the neck 12 toward the funnel 14.

The horizontal deflection coil 22 is constituted by the same pair of left and right deflection coils 220a and 220b. The conductive wires constituting the deflection coils 220a or 220b each have a neck end turn unit 222 and a pair of deflections. It has a plurality of amperage numbers (N) consisting of a portion 224 and a funnel end turn portion 226. The neck end turn portion 222 generally refers to a conductor portion wound in a semicircle on the outer circumference of the neck 12 in parallel with the XY plane, and the funnel end turn portion 226 also has the outer circumference of the funnel 12 in the XY plane. This is the lead portion that is wound along. On the other hand, the deflection portion 224 is attached to the outer periphery of the funnel 14 along the Z axis, the magnetic field generated from the deflection portion 224 substantially deflects the electron beam (e).

For example, as shown in FIG. 2, when the deflection current I flows in the clockwise direction in the left deflection coil 220a and counterclockwise in the right deflection coil 220b, the respective end turns 222 and 226 The magnetic fields cancel each other out, and the magnetic field B by the deflection portion 224 is generated in the Y direction. Since the electron beam e travels perpendicular to the magnetic field B, i.e., moves in the Z-axis direction, the electron beam e is subjected to a force F in the direction perpendicular to the magnetic field B and its movement direction, that is, in the X direction, and is deflected. Here, since the electron beam e moves perpendicular to the magnetic field B, the deflection force F received by the electron beam e is proportional to the magnitude of the magnetic field B.

F = qvB

Where F is the deflection force, q is the charge of the electron beam, v is the speed of the electron beam, and B is the magnitude of the magnetic field. The magnetic field B is proportional to the deflection current I.

B NI

Where B is the magnitude of the magnetic field, N is the number of turns of the wire, and I is the magnitude of the deflection current. Therefore, the deflection force F is proportional to the deflection current I.

F B I.

In fact, the horizontal deflection current I is a sawtooth wave current that changes with time having a frequency of 15.75 kHz, for example, and the magnetic field B generated by the horizontal deflection coil 22 also fluctuates with time. As a result, the deflection force F, which varies in time, allows the electron beam e to be scanned over the entire horizontal width on the screen 18 shown in FIG.

On the other hand, when the vertical deflection coil 26 is a saddle type, the structure and operation are similar to the case of the horizontal deflection coil 22 described above, and description thereof will be omitted.

Here, if the deflection portions 224 in one deflection coil 200a or 220b are not symmetrical with each other, the magnetic field B through which the electron beam e passes will not be symmetrical, and the deflection force F will act in an unintended direction. Can be. When the neck end turn portions 222 and the funnel end turn portions 226 of the left and right deflection coils 200a and 200b that are not symmetrical with each other, the magnetic field components of the left and right deflection coils 200a and 200b do not exactly cancel each other. It may adversely affect the deflection of the electron beam (e).

By the way, the space in which the magnetic field B through which the electron beam e passes is formed is a complicated space that is gradually expanded in a funnel or trumpet shape from the narrow neck 12 to the funnel 14. Accordingly, it is not easy to manufacture the saddle type deflection coils 200a and 200b symmetrically.

In general deflection coils 22 and 26 in which a conventional wire is wound, the windings of the wires forming the deflection coils 22 and 26 are uniform in right and left symmetry so that the magnetic field B having a predetermined size becomes symmetrical. Not only this should be secured, but also had to be manufactured in consideration of the change in characteristics due to deformation due to heat or non-uniform tension, etc., there was a problem that many manufacturing conditions were difficult.

Accordingly, a film-type deflection member in which conductive wires are patterned on a thin film has been proposed in place of a conventional deflection coil in which a conductive wire is wound. Such film-like deflection members are disclosed, for example, in European Patent Publication No. EP 0 169 613 A (applicant: Philips) published January 29, 1986.

Conventionally, when fabricating such a film type biasing member to produce the deflection yoke 20, the assembly bobbin 24, as shown in Figure 3, was simply used as part of the means for supporting the biasing member. The bobbin 24 is composed of a neck end turn support 242, a deflection support 244 and a funnel end turn support 246, a fixed projection for fixing the deflection coil to a predetermined portion of the deflection support 244 ( 248 is formed.

In the conventional bobbin 24 which is an assembly structure configured as described above, the horizontal deflection coil 22 is in close contact with the inner wall of the bobbin 24 and the vertical deflection coil 26 is in close contact with the outer wall of the CRT 10. The outer periphery of the connecting portion of the neck 12 and the funnel 14 is contacted. At this time, the bobbin 24 supporting each of the horizontal and vertical deflection coils 22 and 26 so as to be in close contact with the outer circumference of the CRT 10 has a generally smooth plane in which the inner and outer walls thereof are smooth. Therefore, the conductive wires constituting the horizontal and vertical deflection coils 22 and 26 are compressed and assembled with little space between the outer wall of the CRT 10 and the bobbin 24 and the core 28.

After assembling the deflection coil using the film type deflection member to the bobbin 24 which is a conventional flat assembly structure for the deflection yoke, and then driving the CRT 10, Joule heat is generated in the pattern forming portion of the conductive line in the film. do. At this time, if the frequency of the deflection current flowing through the deflection coil is increased, the skin effect is increased, and the resistance of the conductor is also increased, thereby further facilitating heat generation. In addition, the film-type deflection member that can secure an excellent surface area compared to the deflection coil by the conventional wire winding, despite its advantages, the heat generation conditions are not very good because of the material properties of the base film.

That is, in a deflection coil using a film type deflection member, heat generated in the pattern forming portion of the conductive wire gradually diffuses to the entire base film. The base film used in the film type deflection member is an electrically insulating material having low electrical conductivity. Since the thermal conductivity of the thermal insulation material is small, there is a problem that heat generated in the pattern portion of the conductive wire is not easily radiated to the outside.

Further, according to the structure of the bobbin 24 which is a conventional assembly structure, since the base film of the deflection member is in close contact with the inner wall and the outer wall of the bobbin 24, heat dissipation is hardly achieved.

As a result, the deflection yoke may be excessively heated, and as a result, not only the operation life of the deflection yoke is shortened, but the overall life of the CRT 10 is shortened. In addition, at excessively high temperatures, the characteristics of the deflection yoke and the additional elements are adversely affected, resulting in misconvergence, and the ambient temperature inside the set of the TV is increased, which adversely affects other circuit components. Furthermore, the CRT 10 There is a problem that brings about the degradation of the quality.

In addition, according to the structure of the conventional close-up assembly bobbin 24 there is a problem that the distribution of the pattern of the conductive wire formed on the base film is limited because there is almost no free space.

Accordingly, the present invention is to solve the above-described problems, the assembly structure having an air-cooled air space of the deflection yoke for cathode ray tube to dissipate heat generated in the pattern portion of the conductor in the deflection yoke composed of the film-like deflection member The purpose is to provide.

In addition, another object of the present invention is to provide an assembly structure having an air-cooled air space of the deflection yoke for the cathode ray tube to support the deflection member and to provide a sufficient space to further densify the wire pattern distribution.

1 is a partial cross-sectional view schematically showing the configuration of a cathode ray tube.

Figure 2 is a schematic diagram showing the conductor connection structure and action of the saddle type deflection coil of a typical cathode ray tube.

3 is a schematic view showing the structure of a bobbin that is an assembly structure of a conventional deflection yoke.

Figure 4 is a schematic diagram showing the structure of the assembly structure having an air-cooled air space according to an embodiment of the present invention.

Figure 5a is a schematic diagram showing a cross-sectional structure of the assembly structure having an air-cooled air space according to an embodiment of the present invention.

Figure 5b is a schematic view showing a cross-sectional structure of the assembly structure having an air-cooled air space according to another embodiment of the present invention.

Explanation of symbols for main parts of the drawings

10: cathode ray tube 12: neck

14: Funnel 16: Shadowmask

18: Screen 20: Deflection yoke

22: horizontal deflection coils 220a, 220b: left and right deflection coils

222: neck end turn 224; Deflection

226; Funnel end turn 24, 24 ': bobbin (assembly structure)

242: neck end turn support 244: deflection support

246: funnel end turn support 248: fixed protrusion

249: protrusion 249a: air space

249 ': Opening 26: Vertical deflection coil

28: core

In order to achieve the above object, the present invention, in the assembly structure for fixing and supporting the horizontal and vertical deflection coil in the deflection yoke of the cathode ray tube between the outer peripheral wall and the core of the cathode ray tube, the inner wall or outer wall of the assembly structure and the It provides an assembly structure having an air-cooled air space of the deflection yoke for cathode ray tubes, characterized in that one or more air spaces between the horizontal or vertical deflection coils.

In addition, the assembly structure having the air-cooled air space of the deflection yoke for the cathode ray tube provided by the present invention, in addition to the above configuration, the outer wall or inner wall of the assembly structure protrudes vertically from the outer wall or inner wall to have a predetermined uneven shape. And at least one projection having a generally flat top surface in contact with the horizontal and vertical deflection coils, such that the space between the projections forms an air circulation space; Alternatively, since a plurality of openings are formed, the space formed by the plurality of openings forms an air space.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

4 is a schematic view showing a structure of an assembly structure having an air-cooled air space according to an embodiment of the present invention, Figures 5a and 5b is a cross-sectional structure of the assembly structure having an air-cooled air space according to an embodiment of the present invention A schematic diagram is shown.

The bobbin 24 ′, which is an assembly structure having an air-cooled air space according to a preferred embodiment of the present invention, includes horizontal and vertical deflection coils 22 and 26 in the deflection yoke 20 of the conventional cathode ray tube 10. The structure of the bobbin 24, which is an assembly structure that is fixed and supported between the outer circumferential wall and the core 28 of (10), is improved to secure an air space 249a, which is an air circulation space of a predetermined shape.

The air space 249a is configured to allow air to circulate, and is preferably formed between the inner wall or outer wall of the bobbin 24 'of the assembly structure and the horizontal or vertical deflection coils 22 and 26. The air space 249a is formed on the deflection support portion 244 of the bobbin 24 ', and the edge portion of the bobbin 24', for example, the neck end turn support portion 242, is formed to allow the air to circulate. It may be formed to open at a portion where the pattern of the conductive wire does not pass, such as a portion for assembling the bobbin 24 ′ on the support portion 246 or the deflection support portion 244. In addition, the air space 249a may form a structure in which the whole is connected to one, but may also be formed of a plurality of independent spaces having separate open structures.

Specifically, the bobbin 24 ′ according to the embodiment of the present invention has a structure similar to that of the conventional bobbin 24 described above with reference to FIG. 3, and furthermore, the inner wall or the outer wall has irregularities not flat. It may be configured to include a protrusion 249 or openings 249 'to be shaped.

That is, as illustrated in FIGS. 4 and 5A, on the outer wall or the inner wall of the bobbin 24 ′, which is an assembly structure, a plurality of protrusions 249 may be installed to have a predetermined uneven shape. The protrusion 249 preferably has a trapezoidal shape that projects vertically from the outer wall or inner wall of the bobbin 24 'and has a generally flat top surface. The horizontal and vertical deflection coils 22 and 26 may be in contact with the generally flat top surface. As a result, the space between the at least one spacer 249 may form an air space 249a through which air is circulated.

In addition, as shown in cross section in FIG. 5B, a plurality of openings 249 ′ may be formed in the outer wall or the inner wall of the bobbin 24 ′, which is an assembly structure. Thus, the space formed by the plurality of openings 249 'may form the air space 249a. At this time, the size and the position of each opening 249 'may be variously set according to the pattern shape of the conductive wire.

Further, according to a preferred embodiment of the present invention, the outer space or the inner wall of the bobbin 24 'as an assembly structure, by appropriately combining the above-described protrusion 249 and the opening 249', the air space 249a for air circulation ) Can be appropriately formed.

In the embodiments of the present invention having such a configuration, heat generated in the lead pattern of the deflection member is caused by the air circulated in the air space 249a formed on the inner and outer walls of the bobbin 24 ', which is an assembly structure. Since it can be discharged, it is possible to appropriately suppress the temperature rise effect of the deflection yoke 20.

In addition, the inner and outer walls of the bobbin 24 'are uneven, so as not to contact and support the base film of the deflection member as a whole. For example, only a part of the base film is contacted by the upper surface of the protrusion 249. Since it is maintained to some extent, the structure of the overall deflection member can be maintained in a predetermined shape.

And as a secondary effect, the passage for air circulation secured by the air space 249a can also give a degree of freedom to the pattern portion of the conductive wire formed on the base film. For example, a space for wiring can be secured, and conditions such as densifying the density of the conductor can be freer.

According to the configuration of the assembly structure having the air-cooled air space of the cathode yoke deflection yoke according to the embodiments of the present invention, in the deflection yoke using a film-type deflection member including a conductor forming a plurality of amperons on the film In addition, an air-cooled air space is provided to effectively generate heat generated in the deflection yoke when driving the cathode ray tube.

Accordingly, heat generation of the deflection yoke can be suppressed, deterioration of characteristics such as occurrence of misconvergence and the like can be suppressed, and rise in the ambient temperature in a set such as a TV can be suppressed. As a result, the life of the deflection yoke and the set can be extended, and the reliability of the characteristics of the deflection yoke is improved.

In addition, since a free space may be provided instead of a structure that is simply in close contact, the distribution of conductors in the pattern formed on the base film may also be compacted, and a deflection device capable of responding to a high frequency current may be provided.

The present invention has been shown and described with respect to the assembly structure having the air-cooled air space of the deflection yoke for cathode ray tube according to a particular preferred embodiment, but is not limited to this, and do not depart from the spirit of the present invention or the claims below Many applications and variations are possible within the limits.

Claims (5)

In the assembly structure 24 for fixing and supporting the horizontal and vertical deflection coils 22 and 26 in the deflection yoke 20 of the cathode ray tube 10 between the outer circumferential wall of the cathode ray tube 10 and the core 28. , Assembly structure having an air-cooled air space of the deflection yoke for cathode ray tubes characterized in that it has at least one air space (249a) between the inner wall or the outer wall of the assembly structure 24 'and the horizontal or vertical deflection coils (22, 26). . The outer wall or the inner wall of the assembly structure 24 ', at least one of the upper surface protruding vertically from the outer wall or inner wall and contacting the horizontal and vertical deflection coils to have a predetermined uneven shape, is generally flat. An assembly structure having an air-cooled air space of a deflection yoke for cathode ray tubes, characterized in that a space between the protrusions 249 forms an air space 249a by providing a protrusion 249. A plurality of openings 249 'are formed in an outer wall or an inner wall of the assembly structure 24', so that a space formed by the plurality of openings 249 'forms an air space 249a. Assembly structure having an air-cooled air space of the deflection yoke for the cathode ray tube, characterized in that. The outer wall or the inner wall of the assembly structure 24 ', at least one projecting vertically from the outer wall or the inner wall so as to have a predetermined uneven shape, the at least one upper surface is in contact with the horizontal or vertical deflection coils generally flat More than protrusions 249; An assembly structure having an air-cooled air space of a deflection yoke for cathode ray tubes, characterized in that a plurality of openings (249 ') are provided. The assembly structure according to any one of claims 1 to 4, wherein the air space (249a) has a height of 0.05 mm to 2 mm.