JPS6120986B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manufacturing apparatus for a hollow-shaped deflection coil used in a hollow-shaped deflection coil that is attached to the neck portion of a cathode ray tube in pairs, and particularly for use in in-line color cathode ray tubes. The present invention relates to a manufacturing apparatus suitable for use in manufacturing a saddle-shaped vertical deflection coil.

For example, in an in-line color cathode ray tube in which red, green, and blue electron beams are emitted horizontally in a straight line, the flight distance of the electron beams from the electron gun to the fluorescent surface of the screen is There is a difference between landing at the center of the screen and landing at the periphery of the screen, and the flight distance is longer when landing at the periphery of the screen. Due to this difference in flight distance of the beams, the three beams do not necessarily intersect at the aperture grille. As a result, misconvergence occurs at the periphery of the screen, and the red, green, and blue rasters at the periphery of the screen no longer match.

Therefore, in conventional in-line color cathode ray tubes, a convergence device is installed in the neck section, and the red and blue beams on both sides of the three electron beams are first corrected by this device, and then the magnetic field of the polarizing coil is corrected. The above problem is solved by deflecting the beam.

However, installing such a convergence device not only makes the device complicated but also requires troublesome adjustment.
Proposed in No. 106154. This deflection device has a horizontal deflection coil wound in a saddle shape, and
The resulting horizontal deflection magnetic field is used as a pink tension magnetic field, and the vertical deflection coil is wound in a toroidal shape, and the resulting vertical deflection magnetic field is used as a barrel magnetic field. Whether or not a sufficient gap is formed between the horizontal deflection coil and the deflection width of the electron beam in the horizontal direction at the inner position of the bend portion on the electron beam emission side of the horizontal deflection coil is equal to the deflection width in the vertical direction. It has been made bigger.

Although this device eliminates the need for convergence correction, as mentioned above, a toroidal type is used as the vertical deflection coil, which makes winding the coil inefficient, and the coil cannot be wound with high precision. The problem is that it cannot be rotated.

An object of the present invention is to provide an apparatus for manufacturing a saddle-shaped coil that corrects the above-mentioned problems. In the coil manufacturing apparatus, at least one of the pair of winding formers is provided with a slit extending in the direction of the winding axis of the wire, and the other winding former is provided with a pushing means that can be inserted into the slit. A manufacturing apparatus for a saddle-shaped deflection coil, characterized in that the bonding surfaces of the wound coils are separated from the bonding surfaces of other coils while increasing their distance from each other as they move forward. This is related to. Therefore, according to the present invention, it is possible to provide a saddle-shaped coil with high accuracy and high efficiency, which corrects the above-mentioned problems.

The present invention will be explained below with reference to examples.

First, the coil manufacturing apparatus will be explained with reference to FIGS. 1 and 2. The main parts of this manufacturing apparatus are a convex die 1, a concave die 2, a piece 3 fixed to the concave die 2, and a pair of bend parts for forming the coil. It is composed of press plates 4, 5 and a pair of press plates 6, 7 for forming the joint portion.

The convex mold 1 has a continuous curved side surface and a front surface, and a V-shaped recess 8 into which the piece 3 is fitted is formed on the front surface. Also convex type 1
Four slit-like grooves 9 are formed symmetrically on both sides of the holder. A pair of side plates 10 and 11 are attached to the top and bottom of this convex mold 1. These side plates 10 and 11 are for preventing the bend parts 13 and 14 of the coil 12 from escaping upward and downward when the bend parts 13 and 14 are pressed by the press plates 4 and 5.

This convex mold 1 is connected to the face plate 1 through the mounting plate 15.
It is attached to 6. Face plate 16 is bracket 1
It is attached to the tip of the rotary shaft 18 via 7. Note that this rotating shaft 18 is rotatably supported by a frame 20 by a bearing 19.

Next, regarding the concave mold 2, a concave portion having a curved surface is formed in the concave mold 2, and a piece 3 having a substantially V-shaped cross section is attached to the approximately central portion of this concave portion. This piece 3 is configured to be received in a V-shaped recess 8 of the convex mold 1. Further, four slit-shaped grooves 21 are formed symmetrically in the recessed portion of the recessed mold 2. And this concave type 2
is attached to a mounting plate 22, and this mounting plate 22 is supported by a bracket 24 via a face plate 23. Bracket 24 is bearing 2
5, it is rotatably attached to the support shaft 26.

Also, a plurality of guide pins 27 are attached to this bracket 24, and a smaller face plate 2 is inserted into the bracket 24 by the guide pins 27.
8 is movably supported. The press plates 4 and 5 for forming the bend portion are attached to the face plate 28. The press plates 4 and 5 are configured so that when the face plate 28 moves in the longitudinal direction of the support shaft 26, it can pass through a slit-shaped opening 29 formed in the face plate 23. And this face plate 2
3 is inserted into a bored hole 30 of the support shaft 26 and is attached to the tip of a pressing shaft 31 that is rotatably and slidably supported with respect to the support shaft 26 . Therefore, when the face plate 28 is pressed by the pressing shaft 31, the pressing plates 4, 5 move forward, and the pressing parts 32, 33 formed in semicircular shapes on the pressing plates 4, 5 bend the coil 12. The parts 13 and 14 will be press molded.

On the other hand, the bracket 17 also has a plurality of guide pins 34.
is installed. And this guide pin 34
A face plate 35 is supported slidably thereon.
This face plate 35 is inserted into a boring hole 36 formed in the rotating shaft 18, and the pressing shaft 3 is supported rotatably and slidably with respect to the rotating shaft 18.
It is connected to the tip of 7.

The press plates 6 and 7 for forming the joint portion are attached to the face plate 35. The press plates 6 and 7 have curved surfaces that follow the curved surfaces on both sides of the convex mold 1. Four flat insertion claws 38 are attached to the opposing sides of these press plates 6 and 7, respectively. These pushing claws 38 are for pushing in and bending a part of the joint portion 39 of the coil 12. Note that the portion of the joint 39 of the coil 12 that is not pressed by the claw 38 is pressed by the pressing surfaces 40 of the press plates 6, 7,
41 to be pressed and molded.

Next, a process of manufacturing a coil using the coil manufacturing apparatus having the above configuration will be explained.

The coil 12 produced here is a vertical deflection coil for an in-line color cathode ray tube.

First, as shown in FIG. 2, the support shaft 26 is moved to the left to move the face plate 23 in a direction closer to the face plate 16. Then, the concave die 2 attached to the face plate 23 moves in the direction of the convex die 1 attached to the face plate 16. The piece 3 fixed to the concave mold 2 is fitted into a V-shaped recess 8 formed in the convex mold 1. When the tip of the piece 3 is in contact with the bottom of the recess 8, a predetermined gap is formed between the convex mold 1 and the concave mold 2. At this time, the face plate 35 and the face plate 28 are retracted, and therefore the press plates 6, 7 for forming the joint portion and the press plates 4, 5 for forming the bend portion are retracted.

In this state, the tip of the wire forming the coil is fixed to the piece 3. Next, the rotating shaft 18 is rotated via a drive means (not shown). Then this rotation axis 1
8, bracket 17, face plate 16 and mounting plate 15
The convex mold 1 fixed through the rotary shaft 18 rotates around the axis of the rotating shaft 18. Since the convex mold 1 and the concave mold 2 are connected via the piece 3, the concave mold 2 also rotates. When the concave die 2 is rotationally driven, the face plate 23 and bracket 24 supporting the concave die 2 also rotate, but the bracket 24 and the support shaft 26
Since the bearing 25 is interposed between the support shaft 26 and the support shaft 26, the support shaft 26 does not rotate.

The convex mold 1, the concave mold 2, and the piece 3 are connected to the rotating shaft 18.
and when rotated around the axis of the support shaft 26,
Wire rods are sequentially wound around the outer periphery of the piece 2 in the gap between the convex mold 1 and the concave mold 2. The wire is supplied from a wire supply device by guide means (not shown) attached to the face plates 16 and 23, and is fed into the gap between the convex mold 1 and the concave mold 2.

When a length measuring roller or the like detects that a predetermined amount of wire has been fed, the drive of the rotating shaft 18 is cut off to stop the rotation of the convex mold 1 and the concave mold 2. Then, as shown in FIG. 3, the pressing shafts 37 and 31 are pressed by power cylinders (not shown), respectively, to move the face plate 35 and the face plate 28 in a direction toward each other. At this time, the pressing shafts 37 and 31
are the boring holes 36 and 30 of the rotating shaft 18 and the supporting shaft 26, respectively.
move in the axial direction relative to

When the face plate 35 moves forward as shown in FIG. 1 and enters the gap between the convex die 1 and the concave die 2, and the pressing surfaces 40, 41 of the press plates 6, 7 press the joint portion 39 of the coil 12 to form it. Furthermore, as shown in FIG. 4, the pressing claws 38 connected to the press plates 6 and 7 are formed in the slit-like grooves 9 of the convex mold 1 and the concave mold 2 as the press plates 6 and 7 move. inserted along the slit-shaped groove 21,
The joint portion 39 of the coil 12 is pressed and bent to form a bent portion 43 .

Furthermore, when the face plate 28 moves forward as shown in FIG. Side plates 10, 11
The semicircular pressing parts 32 and 33 of the press plates 4 and 5 press the bend part 1 of the coil 12.
3 and 14 are press-molded. In this way, the vertical deflection coil 12 is completed.

As shown in FIG. 5, the vertical deflection coils 12 manufactured as described above are attached in pairs vertically from the neck portion 46 to the skirt portion 47 of the in-line color cathode ray tube 45. They are attached to the outer periphery of the horizontal deflection coil 48 in pairs on the left and right in a state shifted by 90 degrees with respect to the horizontal deflection coil 48. A bobbin made of synthetic resin is interposed between the horizontal deflection coil 48 and the vertical deflection coil 12, and a core is attached to the outer periphery of the vertical deflection coil 12. These bobbins and cores are not shown.

As shown in FIGS. 6 and 7, this vertical deflection coil 12 has a bend portion 1 on the front side in the beam traveling direction (on the screen side of the color cathode ray tube).
3, and a bend portion 14 on the rear side in the direction of beam propagation (on the gun side of the color cathode ray tube). Further, the front edge of the joint portion 39 has a bent portion 43 formed by the push-in claw 38 . This bent portion 43 is extended from the joint portion 39 and is bent with respect to the bent portions 43 of other coils joined to the joint portion 39 so that the distance between them widens as it goes forward. There is. Further, since the coil 12 is formed by being wound around the outer periphery of the piece 3, it is provided with a window 49 having substantially the same shape as the piece 3. Note that this window 49 is narrow on the front side because the piece 3 has a triangular cross section.
The rear side is wide.

Moreover, when winding this coil 12, the convex shape 1
The gap between the concave mold 2 and the concave mold 2 is substantially uniform at a position corresponding to the beam traveling direction, but on the forward side in the beam traveling direction, the gap becomes larger as it approaches the window 49. ing. In other words, - on the rear side in Figures 6 and 7.
The wire cross section is as shown in FIG. 8, and the wire of the coil 12 is distributed almost uniformly in the circumferential direction of concentric circles centered on the tube axis (z-axis) 50 of the cathode ray tube 45. Also, the mutual joint portion 39 of a pair of coils
are in contact on the vertical axis (y-axis). Further, the window 49 of the coil 12 is arranged symmetrically with respect to the horizontal axis (x-axis), and its width has a length L _R which is relatively large. Therefore, as shown by the dotted line in FIG. 8, a substantially uniform magnetic field or a weak pincushion magnetic field is formed at the rear side of the coil 12.

On the other hand, the - line cross section in FIGS. 6 and 7 is as shown in FIG. 9, and the tube axis 50 of the cathode ray tube 45
Coil 1 in the circumferential direction of a concentric circle centered on
The distribution of wire rods in No. 2 becomes larger as it approaches the x-axis and becomes smaller as it approaches the y-axis.
Further, the width of the window 49 in this cross section is relatively small L _F . Note that this L _F is smaller than the above L _R . Furthermore, a gap 51 is formed by the bent portion 43 symmetrically with respect to the y-axis. The magnetic field in this cross section is a relatively strong barrel magnetic field, as shown by the dotted line in FIG. That is,
According to this vertical deflection coil 12, as shown in FIG. 13, from the front side to the rear side (horizontal axis Z direction) of the coil 12, the magnetic field strength is shown by the curve H _V and the intensity shown by the curve H _B. Magnetic field distribution can be obtained.

Next, a deflection device using this vertical deflection coil 12 will be described. Theoretically, the condition for obtaining a deflection device that does not require convergence correction is to be in the region below the straight line in FIG. Here, the horizontal axis indicates the distance between the center of horizontal deflection and the center of vertical deflection in the traveling direction of the beam, that is, on the z-axis, and as shown in FIG. Take the case where it is on the rear side, and conversely, the center of vertical deflection V
When is located ahead of the center H of horizontal deflection, -
It's on. Furthermore, the units of the horizontal axis in FIG. 10 are determined to be positions.

The vertical axis in FIG. 10 is the concentration angle of the red and blue side beams with respect to the green center beam, and FIG. 12 shows the relationship between this concentration angle and the raster on the screen. In this figure, dotted lines indicate red rasters and phantom lines indicate blue rasters. In the figure, a and b are the differences between the horizontal and vertical projection rasters, respectively, and the concentration angle θ
As _c becomes larger, the difference a and b between the projection rasters becomes larger and larger, and as the concentration angle θ _c becomes smaller, the difference a and b between the projection rasters becomes smaller.

If the concentration angle θ _c cannot be made very small, for example, if θ _c is 1°, then as is clear from FIG. 10, the relationship between the distance between the horizontal deflection center H and the vertical deflection center V By setting Δ to negative in FIG. 10, it is possible to provide a deflection device that does not require convergence correction. In particular, this tendency becomes stronger as the deflection angle of the cathode ray tube increases, and when the deflection angle is between 90° and 110°, it is necessary to set the center of vertical deflection further forward in the direction of beam travel than the center of horizontal deflection. .

In this respect, if the vertical deflection coil 12 is used, a deflection device that does not require convergence correction can be easily provided. This is because by using the saddle-shaped vertical deflection coil 12, the distribution of the windings in the front and back direction is greatly changed, and as shown in FIG. 13, the front side has a strong barrel distribution.
The rear side can have a weak pin distribution or a uniform distribution, and as shown in FIG. 13, the vertical deflection coil 12
By shifting the magnetic field distribution H _V of the horizontal deflection coil 48 relative to the magnetic field distribution H _H of the horizontal deflection coil 48, the vertical deflection center V can be positioned on the beam traveling direction side with respect to the horizontal deflection center H. Because you can.

By shifting the distribution of the magnetic fields of the vertical deflection coil 12 and the horizontal deflection coil 48 in this way, convergence can be easily obtained. This is because if the beam is swung vertically before it is swung horizontally, by the time the beam enters the horizontal deflection magnetic field that is swung horizontally, a vertical raster has already been created, and in this state, This is because misconvergence occurs when a horizontal deflection magnetic field acts, but such a situation can be prevented by vertical deflection after horizontal deflection.

Although the present invention has been described above with reference to Examples, it will be understood that the present invention is not limited to these Examples, and that various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, as shown in FIG. 9, the distribution of the wires on the front side of the vertical deflection coil 12 increases as it approaches the x-axis and decreases as it approaches the y-axis. . However, changing the distribution of the wire in this way is equivalent to providing a gap 51 symmetrically with respect to the y-axis. can be varied for the distribution of Therefore, by increasing the gap 51, that is, by increasing the bending ratio of the bent portion 43 of the coil 12, the distribution of the wire in the circumferential direction centered on the z-axis 50 of the coil 12 can be made uniform. It is possible to do so. By doing this, it becomes easier to insert the press plates 6 and 7 for molding the joint, the joint 39 can be molded reliably, and the gap between the sides of the convex mold 1 and the concave mold 2 becomes larger. Damage to the press plates 6 and 7 for molding the joint can be prevented.

As described above, according to the present invention, there is provided a saddle-shaped coil that is attached to a cathode ray tube in pairs,
The saddle-shaped coil has a joint part connected to the other coil forming the pair on the rear side thereof, and a bent part that extends from the joint part and widens the distance between the two coils as it goes forward. It can be manufactured efficiently and with high precision. The vertical deflection coil for an in-line color cathode ray tube produced by the device of the present invention does not cause misconvergence, and therefore it is possible to provide a deflection device that does not require convergence correction. In addition, the curve ratio of the bent part must be different for each model depending on the deflection angle, size, and other factors of the cathode ray tube, so in the conventional method, the mold had to be changed each time, making it extremely inefficient. Although this is bad and causes cost increases, in the present invention, the curve ratio of the bent portion can be dealt with simply by adjusting the height of the push-in claw, and the device only needs to be changed to a minimum.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is an exploded perspective view of the main parts of the apparatus for manufacturing a saddle-shaped coil, FIG. 2 is a vertical side view of the main parts, and FIG. 4 is a cross-sectional view taken along the line -- in FIG. 3, FIG. 5 is a perspective view of a color cathode ray tube with a sunshade coil made by this device, and FIG. 6 is a sunshade coil. A side view of the coil, FIG. 7 is a plan view of the same, FIG. 8 is a sectional view taken along the - line in FIGS. 6 and 7, FIG. 9 is a sectional view taken along the - line in FIGS. 6 and 7, and FIG. 11 is a schematic plan view of a color cathode ray tube showing the center of horizontal deflection and the center of vertical deflection, and FIG. 12 is a diagram showing the conditions for obtaining a deflection device that does not require convergence correction. FIG. 13 is a perspective view of the main part showing the difference in the projection raster due to the concentration angle of the side beam, and a line diagram showing the distribution of the strength of the horizontal deflection magnetic field and the vertical deflection magnetic field along the beam traveling direction. In addition, in the symbols used in the drawings, 1 is a convex type, 2 is a concave type, 9 is a slit-shaped groove,
12 is a coil, 38 is a push-in claw, 39 is a joint part,
43 is a bent portion.

Claims (1)

[Claims] 1. In an apparatus for manufacturing a vertical deflection coil for an in-line color cathode ray tube, in which a wire is wound in a gap formed between a convex winding former and a concave winding former, the wire is wound around the concave winding former. A plurality of slits are formed extending in the direction of the winding axis, and a pushing means is provided with a plurality of push-in claws that can be inserted into the slits, and the height of the push-in claws is set to a predetermined value. It is extended from the joint surface with another saddle-shaped coil forming a pair formed on one end side of the saddle-shaped coil, and as it goes to the other end side, the distance from the other saddle-shaped coil becomes a predetermined curve. 1. A manufacturing device for a vertically deflecting hollow-shaped coil for an in-line color cathode ray tube, which is configured to form a bent portion that spreads along the slit and the push-in claw.