JP2001167714A - Vertical deflection bobbin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke which is inexpensive, and has a little variation in fabrication. SOLUTION: A vertical deflection bobbin 20 comprises a screen-side plane portion 22a, an electron-side plane portion 22b, and coupling portions 23a-23d coupling them. At the coupling portions 23a, 23b are formed grooves 24a, 24b notched from the plane portion 22a, respectively. As the plane portion 22a has the grooves 24a and 24b formed thereon, it can be enlarged. A core 1 is inserted from its electron gun-side with the plane portion 22a, and is held by the plane portion 22a by being driven from the outer circumferential side. Thus, the core 1 can be easily inserted against the vertical deflection bobbin 20 and fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke device for a cathode ray tube, and more particularly to a bobbin (hereinafter referred to as a "vertical deflection bobbin" in the present specification) serving as a winding frame of a vertical deflection coil in which a vertical deflection coil is wound in a saddle shape. ). For example, the present invention is applied to a color CRT having an in-line type or a delta type electron gun.

[0002]

2. Description of the Related Art FIG. 19 shows, for example, Proceedings of The
Third International Display Workshop, "Development
2 is a side view showing a procedure of assembling a conventional deflection yoke device shown in of 0.26 mm-Pitch 20V DIAMONDTRON "(1996). Unless otherwise noted,
The electron gun side (hereinafter simply referred to as “electron gun side”) of the cathode ray tube to which the deflection yoke device is attached is set upward, and the screen side (hereinafter simply “screen side”) of the cathode ray tube is set downward. I have.

The deflection yoke device includes a vertical deflection bobbin 2, a bobbin (hereinafter referred to as "horizontal deflection bobbin") 3 serving as a bobbin of a horizontal deflection coil, a neck structure 4, and a coil cover 6.
And a circuit board 7.

The neck structure 4 has an auxiliary coil 4a, a fixing tool 4b for fixing the deflection yoke device to a neck portion provided with an electron gun of a cathode ray tube, and a fixing claw 4c. The circuit board 7 incorporates a circuit for distortion correction and the like. The coil cover 6 is installed on the screen side of the horizontal deflection bobbin 3 and covers the screen side of a horizontal deflection coil (not shown).

The vertical deflection bobbin 2 includes a bobbin 2a located on the screen side and a bobbin 2b located on the electron gun side. These cover the core 1 from the screen side and the electron gun side, respectively, and fit the fitting claw 29a of the bobbin 2a and the bobbin 2b.
The vertical deflection bobbin 2 is configured by fitting and combining with the fitting groove 28b of the vertical deflection bobbin.

In assembling the deflection yoke device, a vertical deflection coil (not shown) is wound in a saddle shape around a core 1 and a vertical deflection bobbin 2, and a horizontal deflection coil is wound on the core 1 and the vertical deflection bobbin 2 wound with wires. A screen-side bobbin 3a and an electron gun-side bobbin 3b constituting the bobbin 3 are attached from the screen side and the electron gun side, respectively.

To the structure obtained in this way, the neck structure 4 is attached, the circuit board 7 is combined, necessary wiring is provided, and then the coil cover 6 is assembled to complete the deflection yoke device.

FIGS. 20 and 21 are side views showing a process of mounting the vertical deflection bobbin 2 on the core 1. FIG. First core 1
Is put on the bobbin 2a (FIG. 20). Furthermore, the bobbin 2b is covered from above, the fitting claw 29a and the fitting groove 28b are fitted, and the core 1 is sandwiched between the bobbins 2a and 2b (FIG. 2).
1). The bobbins 2a, 2b may be bonded to each other.

Next, a wire (not shown) constituting a vertical deflection coil is wound around the vertical deflection bobbin 2 combined with the core 1 by a winding machine.

The bobbin 2a has an annular flat portion 22 on the screen side.
a has a wire regulating rib 21a protruding from the plane portion 22a to the screen side. The bobbin 2b has an annular flat portion 22b on the electron gun side and a wire regulating rib 21b protruding from the flat portion 22b toward the electron gun.

[0011]

Since the conventional deflection yoke device is constructed as described above, the vertical deflection bobbin 2
Requires two types of bobbins 2a and 2b on the electron gun side and the screen side, respectively. This tends to increase the cost. Since each of the bobbins 2a and 2b has a dimensional error, the fitting claw 29a and the fitting groove 28b
When the mating state with the bobbin 2
There is a possibility that a gap may be generated between a and 2b. This causes the center axis of the core 1 and the center axis of the vertical deflection bobbin 2 to shift, and in view of the fact that the positional accuracy of the wire greatly affects various characteristics of the deflection yoke, the convergence performance due to so-called axis shift varies. This can lead to problems.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a vertical deflection bobbin which is inexpensive and in which the center axis of the core is not easily deviated from the center axis, and a deflection yoke device using the same. The purpose is to get.

[0013]

Means for Solving the Problems Claim 1 of the present invention
According to the first aspect, a core that extends from a first side to a second side is inserted, and a first flat portion that is arranged on the first side more than the core, and a core that is arranged on the second side more than the core. A vertical deflection bobbin having a vertical deflection coil wound in a saddle shape together with the core, the second deflection portion including a second flat portion and a connecting portion connecting the first flat portion and the second flat portion to each other. So,
The whole is an integral part.

According to a second aspect of the present invention,
2. The vertical deflection bobbin according to claim 1, wherein the second plane portion has a notched groove.

According to a third aspect of the present invention,
2. The vertical deflection bobbin according to claim 1, wherein the vertical deflection bobbin protrudes from the inner peripheral side to the inner peripheral side of the second flat portion and is urged outward by abutting on the outer surface of the core on the second side. 3. And a stopper that deforms.

According to a fourth aspect of the present invention,
4. The vertical deflection bobbin according to claim 1, wherein the first plane portion is substantially annular, and wherein the first plane portion is substantially annular. 5.
A fixing surface which is in contact with the inner surface of the first side of the core on the inner peripheral side of the flat portion.

According to a fifth aspect of the present invention, there is provided:
A core extending from the first side to the second side is inserted, and a first flat portion disposed on the first side of the core and a substantially annular second portion disposed on the second side of the core. A second flat portion, an elastic protrusion provided on an inner surface of the second flat portion and in contact with an outer surface of the core on the second side;
And a connecting portion for connecting the second flat portion and the second flat portion to each other, and a vertical deflection coil is wound in a saddle shape together with the core.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 and 2
FIG. 2 is a side view and a bottom view of the vertical deflection bobbin 20 according to the first embodiment of the present invention. Here, the bottom surface is a plan view seen from the screen side.

The vertical deflection bobbin 20 has a structure in which the conventional vertical deflection bobbins 2a and 2b are integrated, and has a substantially ring-shaped plane portion 22a on the screen side, a substantially ring-shaped flat portion 22b on the electron gun side, and a flat surface. Connecting part 23 for connecting parts 22a and 22b
a, 23b, 23c, and 23d, and the whole is an integral part.

The number of connecting portions need not be limited to four as long as it is plural. Further, for example, a facet 27 may be formed on the flat portion 22a. The inner diameter of the flat portion 22a is described as A.

The vertical deflection bobbin 20 includes a wire regulating rib 21a protruding from the flat portion 22a toward the screen and a flat portion 22a.
b and a wire regulating rib 21b protruding toward the electron gun. Each of the wire regulating ribs 21a and 21b functions to arrange a wire (coil) on the inner surface of the core 1. Then, when changing the direction of the wire from the circumferential direction to the radial direction in order to wind the coil in a saddle shape, the flat portions 22a and 22
It becomes a fulcrum on 22b. How and how many turns the wire is wound between the wire regulating ribs are designed in advance according to the magnetic field distribution to be realized.

The connecting portions 23a and 23b are respectively provided with grooves 24a and 24 extending from the peripheral end of the flat portion 22a.
b is formed, and the connecting portions 23a and 23b are easily spread in the circumferential direction. Thereby, the flat portion 22a is slightly easily spread in the radial direction.

FIG. 3 is a bottom view of the core 1, showing the inner side 1a.
And the bottom surface 1b. The core 1 has a shape that spreads from the electron gun side to the screen side. The outer diameter of the core 1 on the screen side is denoted by B, and the inner diameter of the core 1 on the electron gun side is denoted by D.

FIG. 4 is a sectional view showing the vicinity of the wire regulating rib 21b. The wire restricting rib 21b also has an elastic portion 222 protruding toward the screen on the inner peripheral side of the flat portion 22b, and the outer peripheral surface 221 of the portion 222 has the inner side surface 1a when the core 1 is assembled. Abut In FIG. 2, a circular envelope indicated by a diameter C indicates the position of the outer peripheral surface 221.

FIG. 5 is a side view showing the manner in which the core 1 is incorporated into the vertical deflection bobbin 20. The core 1 is inserted into the vertical deflection bobbin 20 from the screen side to the electron gun side by urging the grooves 24a and 24b in a direction in which the grooves 24a and 24b are expanded by using the outer tapered portion 11 of the core 1. At this time, the flat portion 22
a slightly spreads in the radial direction, so that even if the combination of A <B is satisfied, the core 1 is inserted into the vertical deflection bobbin 20 until the bottom surface 1b is located at the plane portion 22a or the electron gun side. can do. Also part 222
Has elasticity and slightly narrows in the radial direction, so that even if a combination of C> D is satisfied, the inner wall surface 1 a
By contacting the top surface 1c with the flat portion 22b, the core 1 can be more reliably fixed.

FIG. 6 is a sectional view partially showing the structure of the vertical deflection bobbin 20 in a state where the core 1 is incorporated. After the bottom surface 1b is disposed at the position of the flat portion 22a or on the electron gun side therefrom and the vertical deflection coil is wound, the connecting portions 23a and 23b urge the groove portions 24a and 24b to be narrowed. The core 1 has flat portions 22a, 22
b and fixed.

In order to improve the insertion and fixation, BA, C-
It is desirable to set the value of D to a positive appropriate value. If the core 1 is too large, the plane portion 22a does not spread or the portion 222 does not narrow so that the core 1 is fitted to the vertical deflection bobbin 20.

With this structure, since the vertical deflection bobbin 20 is integrated, the number of parts can be reduced, and the winding positions of the electron gun and the screen can be kept constant. Further, rattling between the vertical deflection bobbin 20 and the core 1 is reduced, and the positional relationship between the central axis of the core 1 and the central axis of the vertical deflection bobbin 20 can be kept constant. Therefore, it is possible to reduce variations in characteristics such as convergence performance due to the deflection yoke. If the variation in the screen characteristics is reduced, the productivity of the deflection yoke or the time required for the adjustment process when combined with the cathode ray tube in the subsequent process can be greatly reduced.

FIGS. 7 and 8 are a side view and a bottom view, respectively, showing a modification of the present embodiment. In this modification, the groove portion 24 does not coincide with the connecting portion 23 in the radial direction, and the connecting portion 2
3 at a position substantially 45 ° different along the circumferential direction from
A groove 24 is provided in 2a. Even in such a structure, when the core 1 is inserted into the vertical deflection bobbin 20, the flat portion 22a is slightly easily spread in the radial direction, and FIGS.
Has the same effect as the configuration shown in FIG.

Embodiment 2 FIG. FIG. 9 is a bottom view of the vertical deflection bobbin 20 according to the second embodiment of the present invention. FIG. 10 is an enlarged bottom view showing the portion 10 of FIG.
In the present embodiment, in the vertical deflection bobbin 20 according to the first embodiment, instead of the grooves 24, 24a to 24d,
A plurality of protruding portions 25 having a height d made of, for example, resin are provided on the inner diameter surface of the flat portion 22a.

In the present embodiment, the inner diameter A of the flat portion 22a and the outer diameter B of the core 1 on the screen side when the projection 25 is neglected.
And the relationship of A>B> Ad is set between
There is no need for a to spread. FIG. 11 is a bottom view of the vertical deflection bobbin 20 according to the second embodiment of the present invention.
FIG. 12 is a bottom view showing a portion 12 of FIG. 11 in an enlarged manner. In each case, the core 1 is inserted into the vertical deflection bobbin 20 while crushing the projection 25 on the outer periphery of the core 1 on the screen side. The height δ of the protrusion 25 is smaller than the height d, and the protrusion 25 has elasticity, so that the core 1 is urged inward in the radial direction to be fixed and supported.

Since the protrusion 25 can be provided with good symmetry in the vertical deflection bobbin 20, the vertical deflection bobbin 2
0 can be created with high accuracy. Therefore, in addition to the effect of the first embodiment, there is an advantage that a deflection yoke device with less variation in performance can be obtained.

Embodiment 3 FIG. 13 is a perspective view illustrating a part of the vertical deflection bobbin 20 according to the third embodiment of the present invention. 14 is a bottom view of the vertical deflection bobbin 20, FIG. 15 is a partially broken side view of the vertical deflection bobbin 20 near the screen side, and FIG. 16 is a sectional view 16 of FIG.
It is sectional drawing which expands and shows.

In the present embodiment, with respect to the vertical deflection bobbin 20 according to the first embodiment, the stoppers 26c, 26c on the screen side, for example, on the screen side of the flat portion 22a and on the electron gun side of the wire regulating rib 21a. 26d is added to make the whole an integral part.

The stopper 26c is provided between the connecting portion 23c and the wire restricting rib 21a that match in the radial direction, has a root on the side of the wire restricting rib 21a, and extends toward the connecting portion 23c. More specifically, as it extends from the wire regulating rib 21a to the connecting portion 23c,
It is gradually curved from the direction parallel to the plane portion 22a toward the electron gun. A groove 24c is provided in the connecting portion 23c on the outer peripheral side of the stopper 26c, and the stopper 26c is allowed to move to the outer peripheral side by being urged from the inner peripheral side.

However, in the non-biased state, the inner peripheral side of the stopper 26c protrudes toward the inner peripheral side by a height e from the inner peripheral side of the flat portion 22a. By being urged to the outer peripheral side, the stopper 26c enters the groove 24c, and the inner peripheral side does not protrude more toward the inner peripheral side than the inner peripheral side of the flat portion 22a. Although FIG. 13 illustrates an example in which the groove 24c is notched, a groove in which the inner peripheral side of the connecting portion 23c is recessed may be used as long as the stopper 26c is allowed to move. Also in the present embodiment, the inner diameter A of the flat portion 22a
And the outer diameter B on the screen side of the core 1 is preferably B ≧ A.

Similarly, a stopper 26d and a groove 24d are provided in the connecting portion 23d facing the connecting portion 23c.

Unlike the grooves 23a and 23b, the grooves 24c and 24d do not need to have a function of expanding the flat portion 22a, and need only have a function of moving the stoppers 26c and 26d to the outer peripheral side. It is not necessary to extend to the portion 22a, but it may extend.

FIG. 17 is a sectional view showing a state where the core 1 is being inserted into the vertical deflection bobbin 20 having the above structure.
8 is a cross-sectional view showing a state where the core 1 is further inserted and fixed. In the same manner as in the first embodiment, the core 1 is inserted into the vertical deflection bobbin 20 while urging the grooves 24a and 24b in the expanding direction by using the outer tapered portion 11 of the core 1. At this time, the skirt on the screen side of the outer tapered portion 11 urges the stoppers 26c and 26d to the outer peripheral side, and the stopper 2
6c and 26d are pushed into the grooves 24c and 24d, respectively, so that the core 1 is moved toward the electron gun side by the vertical deflection bobbin 20.
Is not prevented (FIG. 17). In FIG. 17, the inner surface 1a of the core 1 is
It is illustrated that the outer tapered portion 11 starts to abut against the stoppers 26c and 26d earlier than the abutment starts. However, the order of the two abutments may be interchanged depending on, for example, the length of the portion 222 and the length of the stoppers 26c and 26d.

When the top surface 1c of the core 1 is in contact with the screen side of the flat portion 22b, the height of the core 1 is adjusted so that the core 1 moves toward the electron gun from the ends of the stoppers 26c and 26d. The dimensions of the stoppers 26c, 26d can be easily set according to the height h (FIG. 5). By setting as such, the urging of the stoppers 26c and 26d from the inner peripheral side is released. Since there is a relation of B ≧ A, B> Ae, and the inner peripheral sides of the stoppers 26c and 26d are the bottom surface 1b of the core 1.
Is supported from the screen side. That is, the top surface 1 c of the core 1 is formed by the stopper 26 by the screen side of the flat portion 22 b.
The bottom surface 1b is supported by c and 26d, respectively.

According to the present embodiment, after the core 1 is inserted into the vertical deflection bobbin 20, the movement and falling off of the core 1 can be further prevented, and a deflection yoke device with higher productivity can be obtained. . Of course, the relationship of C ≧ D may be set as in the first embodiment, and the inner surface 1 a of the core 1 may be supported by the outer peripheral surface 221.

[0042]

According to the vertical deflection bobbin according to the first aspect of the present invention, the second flat portion can be expanded and the first side of the core can be easily inserted from the second side of the vertical deflection bobbin. Therefore, it is not necessary to combine a pair of components from both sides of the core. Further, since the core can be fixed by elasticity, the position with respect to the core is not easily shifted.

According to the vertical deflection bobbin according to the second aspect of the present invention, by expanding the groove, the second plane is expanded, the core is inserted, and the core is urged and fixed by the expanded groove. .

According to the third aspect of the present invention, the stopper can contact the bottom surface of the second side of the core to support the core. Moreover, when the core is inserted into the vertical deflection bobbin, the stopper is deformed outward, so that the insertion of the core is not hindered.

According to the vertical deflection bobbin according to the fourth aspect of the present invention, the fixing surface supports the inner surface on the first side of the core, and the core can be more securely fixed.

According to the vertical deflection bobbin of the present invention, by inserting the core while crushing the projection, the core is urged by the elasticity of the projection and fixed in the vertical deflection bobbin. .

As described above, according to the first to fifth aspects of the present invention, the number of molded articles constituting the vertical deflection bobbin can be reduced, and the winding positions of the electron gun and the screen are kept constant. By eliminating the play between the core and the vertical deflection bobbin, it is possible to obtain a deflection yoke device which is inexpensive and has little variation in performance.

[Brief description of the drawings]

FIG. 1 is a side view showing Embodiment 1 of the present invention.

FIG. 2 is a bottom view showing the first embodiment of the present invention.

FIG. 3 is a bottom view showing the first embodiment of the present invention.

FIG. 4 is a sectional view showing Embodiment 1 of the present invention.

FIG. 5 is a side view showing the first embodiment of the present invention.

FIG. 6 is a sectional view showing Embodiment 1 of the present invention.

FIG. 7 is a side view showing a modification of the first embodiment of the present invention.

FIG. 8 is a bottom view showing a modification of the first embodiment of the present invention.

FIG. 9 is a bottom view showing the second embodiment of the present invention.

FIG. 10 is a bottom view showing Embodiment 2 of the present invention.

FIG. 11 is a bottom view showing Embodiment 2 of the present invention.

FIG. 12 is a bottom view showing Embodiment 2 of the present invention.

FIG. 13 is a perspective view showing a third embodiment of the present invention.

FIG. 14 is a bottom view showing Embodiment 3 of the present invention.

FIG. 15 is a side view showing Embodiment 3 of the present invention.

FIG. 16 is a sectional view showing Embodiment 3 of the present invention.

FIG. 17 is a sectional view showing a third embodiment of the present invention.

FIG. 18 is a sectional view showing a third embodiment of the present invention.

FIG. 19 is a side view showing a conventional technique.

FIG. 20 is a side view showing a conventional technique.

FIG. 21 is a side view showing a conventional technique.

[Explanation of symbols]

1 core, 11 outer tapered portion, 20 vertical deflection bobbin, 22a, 22b plane portion, 23, 23a to 23d connecting portion, 24, 24a to 24d groove, 26c, 26d Stopper, 221 outer peripheral surface.

Continued on the front page (72) Inventor Yasushi Hisaoka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 5C042 FF06 FG14 FG17 FG19

Claims (5)

[Claims] 1. A core, which extends from a first side to a second side, is inserted, a first flat portion disposed on the first side relative to the core, and a first planar portion disposed on the second side relative to the core. A second flat portion, and a connecting portion for connecting the first flat portion and the second flat portion to each other. The whole is an integral part, and the vertical deflection coil together with the core is a saddle type. Vertical deflection bobbin wound in a shape. 2. The vertical deflection bobbin according to claim 1, wherein the second flat portion has a notched groove. 3. A stopper protruding inward from an inner peripheral side of the second flat portion and being urged outward by being brought into contact with an outer surface of the second side of the core to be deformed. The vertical deflection bobbin according to claim 1, comprising: 4. The core according to claim 1, wherein the first flat portion has a substantially annular shape, and further includes a fixing surface which is in contact with the inner surface of the first side of the core on an inner peripheral side of the first flat portion. 3. The vertical deflection bobbin according to any one of 3. 5. A core extending from a first side to a second side is inserted, a first flat portion disposed on the first side relative to the core, and a first planar portion disposed on the second side relative to the core. A substantially annular second flat portion, an elastic projection provided on the inner surface of the second flat portion and in contact with the outer surface on the second side of the core, the first flat portion and the second flat portion. A vertical deflection bobbin comprising: a connecting portion that connects the second flat portions to each other; and a vertical deflection coil wound in a saddle shape together with the core.