KR100786830B1 - Deflection apparatus for cathode ray tube - Google Patents

Abstract

A deflection device for a cathode ray tube which deflects an electron beam emitted from an electron gun, and corrects a mis-convergence pattern by matching three-beam electron beams in all parts of a screen, wherein the deflection device includes at least one of a horizontal deflection coil and a vertical deflection coil. (A) A pair of small-diameter flange portions located on the electron gun side, a large-diameter flange portion located on the fluorescent surface side, a pair of connecting portions respectively connecting one end of the small-diameter flange portion and the large-diameter flange portion, and a part of the small-diameter flange portion And an auxiliary magnetic field forming portion protruding toward the large-diameter flange portion or protruding in a direction opposite to the large-diameter flange portion to generate an auxiliary magnetic field for the G electron beam.

Cathode ray tube, electron gun, deflection device, horizontal deflection coil, vertical deflection coil, misconvergence, auxiliary magnetic field, deflection magnetic field

Description

Deflection Device for Cathode Ray Tubes {DEFLECTION APPARATUS FOR CATHODE RAY TUBE}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partial cutaway sectional view of a cathode ray tube equipped with a deflection apparatus according to the present invention;

2 is a perspective view of a deflection coil according to a first embodiment of the present invention.

3 is a plan view of a deflection coil according to a first embodiment of the present invention.

4 is an enlarged view of a portion of FIG. 3 for explaining current flow;

5 is a cross-sectional view taken along the line C-C of FIG.

FIG. 6 is a schematic diagram illustrating the magnetic field pattern of FIG. 5 as a multipolar magnetic field. FIG.

FIG. 7 is a schematic diagram illustrating a force received by an electron beam by the magnetic field pattern of FIG. 6. FIG.

8 is a schematic view of a cathode ray tube showing the path of travel of an electron beam;

9 is a plan view of a deflection coil according to a second embodiment of the present invention.

10 is a partially enlarged view of FIG. 9 for explaining current flow;

FIG. 11 is a sectional view taken along the line D-D in FIG. 10; FIG.

FIG. 12 is a schematic diagram illustrating a force received by an electron beam by the magnetic field pattern of FIG. 11; FIG.

13 is a plan view of a deflection coil according to a third embodiment of the present invention.

FIG. 14 is an enlarged view of a portion of FIG. 13 for explaining current flow; FIG.

15 is a plan view of a deflection coil according to a fourth embodiment of the present invention.

FIG. 16 is a partially enlarged view of FIG. 15 for explaining current flow; FIG.                 

17 is a plan view of a deflection coil according to a fifth embodiment of the present invention.

18 is a front view of a bobbin according to an embodiment of the present invention.

19A to 19C are partially enlarged views of the bobbin shown in FIG. 18.

20 is a schematic diagram of a deflection apparatus according to the prior art and a magnetic field pattern generated in the deflection apparatus.

21 is a perspective view of a deflection coil according to the prior art.

Fig. 22 is a schematic diagram showing a miss-convergence pattern occurring in a cathode ray tube according to the prior art.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cathode ray tubes used in color televisions and the like, and more particularly, to a deflection apparatus mounted on a cathode ray tube to deflect an electron beam emitted from an electron gun.

In general, the cathode ray tube has a panel in which a fluorescent surface is formed on an inner surface, a neck portion in which an electron gun is mounted, and a funnel connecting the panel and the neck portion are integrally combined, and a shadow mask for color separation of the electron beam is provided. Fixed inwardly, a deflection device for electron beam deflection is coupled on the outer periphery of the funnel.

With this arrangement, the three-stem electron beam emitted from the electron gun is deflected by the magnetic field generated by the deflector, and is separated into the corresponding R, G, and B fluorescent films provided on the fluorescent surface while passing through the holes of the shadow mask, and the predetermined color image. Will be implemented.

Here, in the conventional deflection apparatus, a horizontal deflection coil and a vertical deflection coil are respectively installed inside and outside the separator with a separator as an insulator interposed therebetween, and a conical core is connected to the vertical deflection coil at the outside of the separator. Is done.

FIG. 20 is a schematic view of a deflection device and a magnetic field pattern generated in the deflection device, wherein horizontal deflection coils 1a disposed above and below the horizontal axis X with respect to the horizontal axis X of the cathode ray tube are pincushioned horizontally. A magnetic field is generated to deflect the electron beams in a horizontal direction, and the vertical deflection coils 1b disposed on the left and right sides of the vertical axis Y with respect to the vertical axis Y of the cathode ray tube generate a barrel-type vertical magnetic field to generate the electron beams. Deflect in the vertical direction.

In particular, the magnetic field generated in the deflecting device is a barrel-type weak magnetic field to the electron gun side in the horizontal deflection coil 1a so that the three-beam electron beams can be matched in all parts of the screen, and a rectangular linear screen can be realized according to the shape of the panel. (Not shown), a strong pincushion type magnetic field is generated toward the fluorescent surface side, and a weak barrel type magnetic field is generated as a whole in the vertical deflection coil 1b.

Fig. 21 is a perspective view of a deflection coil according to the prior art, wherein the deflection coil 1 includes a small diameter flange portion 3 located on the electron gun side, a large diameter flange portion 5 located on the fluorescent surface side, and each flange portion. It consists of a pair of connections 7 which connect the ends, and a deflection magnetic field mainly occurs at the pair of connections 7. The deflection magnetic field is thus adjusted by varying the coil distribution of the connection 7.                         

However, since the current cathode ray tube is gradually flattening the panel shape, it is necessary to reset the deflection magnetic field corresponding to the flattened panel shape, but the change in the coil distribution of the connection part 7 is positive for the flattened panel shape. It is not possible to respond.

That is, in order to cope with the flattened panel shape, the horizontal deflection coil 1a increases coil distribution of the connection portion 7 near the large diameter flange portion 5 to further strengthen the existing strong pincushion type magnetic field, and together with the small diameter The coil distribution of the connection 7 near the flange 3 must also be increased to change the existing weak barrel type magnetic field into a strong barrel type magnetic field. In addition, the vertical deflection coil 1b should increase the coil distribution of the connecting portion 7 as a whole to generate a stronger barrel magnetic field.

However, as shown in FIG. 22, when the horizontal deflection coil 1a generates a strong barrel-type magnetic field toward the electron gun side, the deflection sensitivity with respect to the center G electron beam among the three stem electron beams increases, and the G electron beam The so-called HCR (Horizontal Center Raster) miss-convergence pattern in which the scan trajectory is located outside the scan trajectory of the R / B electron beam is generated.

At the same time, when the barrel-type magnetic field generated by the vertical deflection coil 1b is further strengthened, the deflection sensitivity with respect to the center G electron beam is decreased, so that the scanning trajectory of the G electron beam is higher than that of the R / B electron beam in the upper and lower portions of the screen. It has a disadvantage of deteriorating the screen quality of the cathode ray tube, such as a so-called VCR (Vertical Center Raster) miss-convergence pattern located inside.

Therefore, the present invention is to solve the above problems, an object of the present invention is to implement a more rectangular straight screen corresponding to the flat panel shape, and match the convergence of the three-strip electron beam in all parts of the screen HCR and VCR The present invention provides a deflection device for a cathode ray tube capable of correcting a mis-convergence pattern.

In order to achieve the above object, the present invention,

A separator that is an insulator, a pair of horizontal deflection coils installed inside the separator, a core installed outside the separator, and a pair of vertical deflection coils connected to the core and installed outside the separator,

At least one of the horizontal deflection coil and the vertical deflection coil,

A small diameter flange portion positioned at one side end, a large diameter flange portion disposed at the other end side opposite to the small diameter flange portion, and a pair of connecting portions connecting one end of the small diameter flange portion and the large diameter flange portion, respectively; It provides a deflecting device for a cathode ray tube comprising an auxiliary magnetic field forming portion for protruding toward the large diameter flange portion from a portion of the small diameter flange portion or in a direction opposite to the large diameter flange portion to generate an auxiliary magnetic field for the G electron beam. .

The auxiliary magnetic field forming unit generates an auxiliary magnetic field for moving the central G electron beam toward the electron gun side of the deflection coil, apart from the deflection magnetic field for deflecting the three-stem electron beam to each part of the screen when a current is supplied to the deflection coil. And correct the travel path.

Accordingly, the present invention has the advantage of easily correcting the miss-convergence pattern of the screen by matching the R / B electron beam scanning trajectory and the G electron beam scanning trajectory, and realizing a more linear rectangular screen corresponding to the flat panel shape.

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

1 is a partial cut-away cross-sectional view of a cathode ray tube provided with a deflection apparatus according to an embodiment of the present invention, in which the deflection apparatus 2 is a separator 4 which is an insulator and horizontally provided inside and outside the separator 4, respectively. A deflection coil 6a and a vertical deflection coil 6b, and a conical core 8 which is installed in connection with the vertical deflection coil 6b from the outside of the separator 4; ) Shows a saddle-saddle type that surrounds the vertical deflection coil 6b.

The deflecting device 2 having the above-described configuration is disposed on the outer circumference of the funnel 10 and is located between the electron gun 12 and the fluorescent surface 14 on the tube axis Z of the cathode ray tube, and respectively above and below the electron beam path. The horizontal magnetic field is generated from the pair of horizontal deflection coils 6a disposed, and the vertical magnetic field is generated from the pair of vertical deflection coils 6b disposed on the left and right sides of the electron beam path, respectively. The stem electron beam is deflected onto the fluorescent surface 14.

Here, the deflection device 2 according to the present embodiment corrects the miss-convergence pattern of the three-stripe electron beam and vertically deflects the horizontal deflection coil 6a and the vertical deflection so as to implement a more linear rectangular screen corresponding to the flat panel shape. At least one of the coils 6b is manufactured in the following configuration.

2 and 3 are a perspective view and a plan view, respectively, of the deflection coil according to the first embodiment of the present invention, wherein the deflection coil 6 is located on one side (left side in the drawing) facing the electron gun on the tube axis Z of the cathode ray tube. The small diameter flange portion 16, the large diameter flange portion 18 located on one side (right side in the drawing) facing the fluorescent surface, and one end of the small diameter flange portion 16 and the large diameter flange portion 18, respectively. And a pair of connecting portions 20 and an auxiliary magnetic field forming portion 23 protruding toward the large diameter flange portion 18 from the center of the small diameter flange portion 16.

The auxiliary magnetic field forming unit 23 connects the pair of auxiliary connecting portions 24 bent toward the large diameter flange portion 18 at two points of the small diameter flange portion 16 and the two ends of the auxiliary connecting portion 24. It consists of an auxiliary flange 22, in this embodiment, the auxiliary connecting portion 24 is parallel to the connecting portion 20 on the small diameter flange 16 side, the auxiliary flange 22 is a small diameter plan It is configured parallel to the branch 16.

As the auxiliary magnetic field forming portion 23 protrudes from the small diameter flange portion 16 as described above, the auxiliary flange portion 22 is connected to the small diameter flange portion 16 in the tube axis Z direction of the cathode ray tube. It has a predetermined step B. Thus, when the distance between the small diameter flange portion 16 and the large diameter flange portion 18 is A on the tube axis Z of the cathode ray tube, the distance between the large diameter flange portion 18 and the auxiliary flange portion 22 is AB. Becomes

The operation of the deflection coil 6 having the above-described configuration will be described below by taking the horizontal deflection coil 6a as an example.

4 is a partially enlarged view of a horizontal deflection coil 6a for explaining current flow, and FIG. 5 is a cross-sectional view taken along line CC of FIG. 4. In general, the deflection coil has a structure in which wires are wound and fixed several times according to a predetermined shape. Here, it is shown assuming that a case consisting of one wire for convenience, in Figure 5 a pair of horizontal deflection coil (6a) is mirror-arranged on the upper, lower portion of the horizontal axis (X) relative to the horizontal axis (X) of the cathode ray tube The cross-sectional shape thereof is shown.

As shown in FIG. 4, when the current of the horizontal deflection coil 6a is provided to the small diameter flange portion 16 through the first connection portion 20a in the upper portion of the drawing, for example, the small diameter flange portion 16 The current provided at the upper end of the supply is provided to the auxiliary flange portion 22 through the first auxiliary connection portion 24a, and the current is then lowered to the second auxiliary connection portion 24b and the small diameter flange portion 16 at the bottom of the drawing. It passes through the end part through the 2nd connection part 20b of the lower figure to the large diameter flange part 18 which is not shown in figure.

As described above, the current flow of the horizontal deflection coil 6a is opposite to each other at the first connection portion 20a and the first auxiliary connection portion 24a, and opposite to each other at the second auxiliary connection portion 24b and the second connection portion 20b. Direction, and each of the first and second auxiliary connections 24a, 24b has a current flow in the opposite direction with respect to each other.

As a result, the horizontal deflection coil 6a is further formed with a current flow by the auxiliary flange 22 and the pair of auxiliary connecting portions 24, compared to the deflection coil structure according to the prior art, and further, the auxiliary connecting portion 24. The current flow of is opposite to the current flow in the neighboring connection 20.

Therefore, referring to the current flow in the cross section of the horizontal deflection coil 6a based on the current flow shown in FIG. 4, the currents of the first connection part 20a and the second auxiliary connection part 24b are grounded as shown in FIG. 5. Outwards (dots in the circle), the current of the first auxiliary connection 24a and the second connection 20b represents a flow into the ground (x mark in the circle), and each connection 20 by the current flow And magnetic fields (shown in dashed lines) are formed around the auxiliary connecting portion 24.

Here, if the direction of the magnetic field is defined using Fleming's right-hand rule, a magnetic field in a counterclockwise direction is formed around the first connecting portion 20a and the second auxiliary connecting portion 24b, and the first auxiliary connecting portion 24a is formed. ) And a second magnetic field is formed around the second connecting portion 20b.

FIG. 6 is a diagram illustrating the magnetic field pattern of FIG. 5 as a multipolar magnetic field, and FIG. 7 is a diagram illustrating the force applied to the electron beam by the magnetic field pattern of FIG. 6, and the image of the cathode ray tube vertical axis Y is defined by the deflection coil shape. N-poles and S-poles are formed at the bottom, a pair of S-poles are formed above the horizontal axis X, and a pair of N-poles are formed below the horizontal axis X, respectively, to form a six-pole magnetic field.

Therefore, the magnetic force lines generated in the horizontal deflection coil 6a are first magnetic lines (shown by dotted arrows) from the N poles on the vertical axis Y to the S poles, and opposite to the first magnetic lines on the left and right sides of the first magnetic lines. It consists of second and third magnetic lines generated by. In this case, the first magnetic force line is due to the current flow of the first and second auxiliary connection parts 24a and 24b, and the second and third magnetic force lines are due to the current flow of the first and second connection parts 20a and 20b. The deflection coil further forms a first magnetic line of force as compared to the conventional structure.                     

As a result, the three stems R, G, and B electron beams emitted from the electron gun 12 have a force in the left direction of the drawing (see the solid arrow in FIG. 7) under the influence of the second and third magnetic lines as shown in FIG. 8. When the deflector is deflected and directed toward the fluorescent surface, and the barrel-type magnetic field of the electron gun side of the horizontal deflection coil 6a is strengthened in response to the flat panel shape as described above, the center G electron beam increases the deflection sensitivity and the R / B electron beam. Scan trajectory is formed outside of.

At this time, as the horizontal deflection coil 6a according to the present embodiment additionally forms the first magnetic field lines inside the small-diameter flange portion 16 on the electron gun side, the central G electron beam is separated by the influence of the first magnetic lines. The deflection force strengthened by the barrel-type magnetic field is canceled by receiving a force (see the dashed line arrow in FIG. 7) in a direction opposite to the deflection direction of the stem electron beam.

Accordingly, the horizontal deflection coil 6a may correct the scan trajectory of the G electron beam to coincide with the scan trajectory of the R / B electron beam in the left and right portions of the screen, and the moving path of the corrected G electron beam is illustrated by a dotted line.

On the other hand, the deflection sensitivity of the G-electron beam by the first magnetic force line is proportional to the step B between the small-diameter flange portion 16 and the auxiliary flange portion 22, that is, the length of the auxiliary connection portion 24 shown in FIG. By adjusting the step B, the deflection sensitivity of the G electron beam can be easily controlled.

When the current flow of the horizontal deflection coil 6a is reversed, the direction of the magnetic force lines shown in FIGS. 5 to 7 is reversed, so that the three stem R, G, and B electron beams in FIG. The deflection sensitivity is adjusted and the center G electron beam is deflected by the influence of the first magnetic field line so that the scanning trajectory of the G electron beam can be matched with the scanning trajectory of the R / B electron beam.

9 is a plan view of a deflection coil according to a second embodiment of the present invention, and FIG. 10 is a partially enlarged view of a deflection coil for explaining current flow, and an auxiliary magnetic field forming unit in the deflection coil 6 according to the present embodiment. Reference numeral 27 protrudes in a direction opposite to the large-diameter flange portion 18 at the center of the small-diameter flange portion 16.

That is, the auxiliary magnetic field forming portion 27 is a pair of auxiliary connecting portion 28 bent in the opposite direction to the large diameter flange portion 18 at two points of the small diameter flange portion 16, and the auxiliary connecting portion 28 It consists of an auxiliary flange portion 26 connecting the two ends, in this embodiment, the auxiliary connecting portion 28 is parallel to the connecting portion 20 on the small diameter flange portion 16 side, the auxiliary flange portion 26 Is configured in parallel with the small diameter flange portion 16.

Therefore, the auxiliary flange portion 26 has a predetermined step B ′ with the small diameter flange portion 16 in the tube axis Z direction of the cathode ray tube, and the small diameter flange portion on the tube axis Z of the cathode ray tube. When the distance between the 16 and the large diameter flange portion 18 is A, the distance between the large diameter flange portion 18 and the auxiliary flange portion 26 is A + B '.

With this configuration, the current flow of the deflection coil 6 is in the same direction at the first connecting portion 20a and the first auxiliary connecting portion 28a, and the same at the second auxiliary connecting portion 20b and the second connecting portion 20b. Direction, each of the first and second auxiliary connections 28a, 28b has a current flow in the opposite direction with respect to each other.

The operation of the deflection coil having the above configuration will be described with reference to the vertical deflection coil 6b as follows.

FIG. 11 is a cross-sectional view taken along line DD of FIG. 10, and FIG. 12 is a diagram illustrating a force applied to an electron beam by the magnetic field pattern of FIG. 11. In the drawing, a pair of vertical deflection coils 6b refers to the vertical axis Y of the cathode ray tube. The mirrors are arranged to the left and right of the vertical axis Y.

As shown in the drawing, when the current of the vertical deflection coil 6a is supplied to the auxiliary flange portion 26 through the first connection portion 20a and the first auxiliary connection portion 28a, the first connection portion 20a and the first connection portion 20a are provided. The current of the auxiliary connecting portion 28a comes out of the ground (dotted in the circle), and the current of the second connecting portion 20b and the second auxiliary connecting portion 28b represents the flow into the ground (x in the circle). As a result, a magnetic field in the counterclockwise direction is formed around the first connecting portion 20a and the first auxiliary connecting portion 28a by the current flow, and clockwise around the second connecting portion 20b and the second auxiliary connecting portion 28b. A magnetic field is formed.

Therefore, the left side of the horizontal axis (X) of the cathode ray tube becomes the N pole, the right side is the S pole, a pair of N poles are formed on the left side of the vertical axis (Y), and a pair of S poles are formed on the right side of the vertical axis (Y). A magnetic field is formed, and three magnetic lines of force are formed inside the vertical deflection coil 6b by the magnetic field. Among the three magnetic lines, the first magnetic lines are newly generated by the current flow of the first and second auxiliary connectors 28a and 28b, and the second and third lines are generated by the current flow of the first and second connectors 20a and 20b. It has the same direction as the magnetic force line.

Accordingly, the three-stem electron beam emitted from the electron gun 12 is deflected by the force (see the solid arrow) in the downward direction of the drawing under the influence of the second and third magnetic lines to face the fluorescent surface 14, as described above. When the barrel-shaped magnetic field of the vertical deflection coil 6b is strengthened in correspondence with the panel shape, the deflection sensitivity with respect to the center G electron beam is reduced.

However, as the first magnetic force line is further formed on the electron gun side of the vertical deflection coil 6b in this embodiment, the central G electron beam receives the force (see the dashed line arrow) in the same direction as the deflection direction of the three-strip electron beam. The deflection sensitivity weakened by the barrel type magnetic field increases.

Accordingly, the vertical deflection coil 6b may correct the scan trajectory of the G electron beam by the first magnetic force line to coincide with the scan trajectory of the R / B electron beam in the upper and lower portions of the screen.

FIG. 13 is a plan view of a deflection coil according to a third embodiment of the present invention, and FIG. 14 is a partially enlarged view of a deflection coil for explaining current flow, and an auxiliary magnetic field forming unit in the deflection coil 6 according to the present embodiment. 30 consists of a pair of auxiliary connection parts 32 bent at a predetermined angle with respect to any bending point 30a located on the large diameter flange portion 18 side from two points of the small diameter flange portion 16. .

As described above, the structure in which the auxiliary magnetic field forming portion 30 has a substantially triangular shape can be wound based on the bending point 30a when the electric wire is wound at the time of manufacturing the deflection coil 6, so that the deflection coil 6 ) Is easier to manufacture, and the strength of the first magnetic line is easily adjusted according to the change in distance from the bending point 30a with respect to the small-diameter flange portion 16, so that the action of the present invention by the first magnetic line It has the advantage of implementing more effectively.

In the deflection coil 6 having the above-described configuration, the magnetic field pattern newly generated by the auxiliary connecting portion 32 and the adjustment principle for the G electron beam are made the same as in the first embodiment described above.

FIG. 15 is a plan view of a deflection coil according to a fourth embodiment of the present invention, and FIG. 16 is a partially enlarged view of a deflection coil for explaining current flow, and an auxiliary magnetic field forming unit in the deflection coil 6 according to the present embodiment. 34 is a pair of auxiliary connections 36 that are bent at an angle with respect to any bending point 34a located in a direction opposite the large diameter flange portion 18 from two points of the small diameter flange portion 16. Is made of.

The magnetic field pattern newly added by the configuration of the auxiliary magnetic field forming unit 34 and the principle of adjusting the deflection sensitivity with respect to the G electron beam are the same as in the second embodiment described above.

FIG. 17 is a plan view of a deflection coil according to a fifth embodiment of the present invention. In the deflection coil 6 according to the present embodiment, the auxiliary magnetic field forming portion 39 has a large diameter plan at two points of the small diameter flange portion 16. It consists of a pair of auxiliary connecting portions 40 bent at a predetermined angle in a direction opposite to the branch portion 18, and an auxiliary flange portion 38 connecting two ends of the auxiliary connecting portions 40 to have a substantially trapezoidal shape. .

The deflection coil 6 having the auxiliary magnetic field forming portion 39 of the above-described configuration also has the same effect as the second embodiment described above.

The deflection coils 6 of the various embodiments described above are mounted on a deflection device wound on separate bobbins manufactured for each embodiment, or wound on a separator having the bobbin shape. Here, as an example, a bobbin for manufacturing a deflection coil according to a first embodiment of the present invention will be described. The bobbin shape described below can be applied to a separator.

18 is a front view of a bobbin according to an embodiment of the present invention, Figures 19a to 19c is a partial enlarged view of the bobbin, the bobbin 42 and the small diameter hook portion 44 corresponding to the shape of the small diameter flange portion; And a large diameter hook portion 46 corresponding to a large diameter flange portion shape, and a curved portion 48 formed into a predetermined curved surface corresponding to the shape of the connecting portion, and the small diameter hook portion 44 includes a small diameter flange portion. It is comprised by the main hook part 44a for a structure, and the auxiliary hook part 44b for configuring an auxiliary flange part.

The auxiliary hook portion 44b is disposed toward the large-diameter hook portion 46 with a predetermined step in the main hook portion 44a corresponding to the shape of the auxiliary flange portion, and the bobbin 42 so that the wire 50 is wound and mounted. It is made of a shape drawn in a predetermined width from the surface of the.

As a result, as shown in FIG. 19, the electric wire 50 is guided to the large-diameter hook portion 46 through the main hook portion 44a of the small-diameter hook portion 44 from the outside of the bobbin 42. The electric wire 50 passing through the 46 passes through the large-diameter hanger 46 through the main hanger 44a, and then is led to the auxiliary hanger 44b through the main hanger 44a, and the auxiliary The electric wire 50 passing through the hook portion 44b passes through the large-diameter hook portion 46 via the main hook portion 44a again.

Therefore, by repeating the above process to produce a deflection coil including an auxiliary flange, the auxiliary hook portion 44b is for producing a deflection coil according to the first embodiment of the present invention, the auxiliary hook portion ( 44b) corresponds to the second to fifth embodiments of the present invention, and its shape and height can be adjusted to easily produce deflection coils of various embodiments.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

As described above, the present invention includes an auxiliary flange formed by bending a small diameter flange portion of the deflection coil toward the electron gun or the fluorescent surface, thereby forming a separate deflection magnetic field for controlling the deflection sensitivity of the G electron beam in addition to the magnetic field for deflecting the three-stem electron beam. The scanning trajectory of can be corrected easily. Therefore, corresponding to the planarized panel shape, the R, G, and B electron beam scanning trajectories are matched to correct a mis-convergence pattern of the screen, and a more straight rectangular screen is realized.

Claims (9)

A separator that is an insulator; A pair of horizontal deflection coils installed inside the separator; A core installed outside the separator; And A pair of vertical deflection coils connected to the core and installed outside the separator, At least one of the horizontal deflection coil and the vertical deflection coil, A small diameter flange portion located at one end; A large diameter flange portion disposed at the other end and facing the small diameter flange portion; A pair of connecting portions connecting one end of the small diameter flange portion and the large diameter flange portion, respectively; And And an auxiliary magnetic field forming portion protruding toward the large diameter flange portion from the portion of the small diameter flange portion or protruding in a direction opposite the large diameter flange portion to generate an auxiliary magnetic field for the G electron beam. The method of claim 1, And a pair of auxiliary connecting portions bent from two points of the small diameter flange portion toward the large diameter flange portion, and an auxiliary flange portion connecting an end portion of the auxiliary connecting portion. The method of claim 2, A deflection device for cathode ray tubes, wherein the auxiliary connecting portion is parallel to the connecting portion on the side of the small diameter flange portion. The method of claim 1, And a pair of auxiliary connecting portions, wherein the auxiliary magnetic field forming portion is bent from two points of the small diameter flange portion based on a bending point located on the large diameter flange portion side. The method of claim 1, And the auxiliary magnetic field forming unit includes a pair of auxiliary connecting portions bent in two directions of the small diameter flange portion against the large diameter flange portion, and an auxiliary flange portion connecting the end portions of the auxiliary connecting portions. The method of claim 5, A deflection device for cathode ray tubes, wherein the auxiliary connecting portion is parallel to the connecting portion on the side of the small diameter flange portion. The method of claim 1, And a pair of auxiliary connecting portions, wherein the auxiliary magnetic field forming portion is bent from two points of the small diameter flange portion at a bending point located in a direction opposed to the large diameter flange portion. The method of claim 1, And a pair of auxiliary connection portions bent in two directions of the small diameter flange portion against the large diameter flange portion at two points of the small diameter flange portion, and an auxiliary flange portion connecting the end portions of the auxiliary connection portions. The method of claim 1, It further comprises a bobbin for winding the deflection coil by winding, The bobbin, A small diameter hook portion including a main hook portion corresponding to the shape of the small diameter flange portion, and an auxiliary hook portion having a step with the main hook portion corresponding to the shape of the auxiliary magnetic field forming portion; A large diameter hook portion corresponding to the large diameter flange portion shape; And Deflection apparatus for a cathode ray tube comprising a curved portion formed in a curved surface corresponding to the connection portion shape.

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