JP2002304960A - Deflector and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a focus in the peripheral area of a screen by offsetting a distorted magnetic field in the rear of a deflection yoke. SOLUTION: The rear end of a saddle type horizontal deflection coil composing a deflection yoke 16 takes the shape of a flat bent part 17B', and a magnetic field compensating means 23 for compensating distortion is provided in the rear of the flat bent part 17B' of the horizontal deflection coil 17 so as to offset magnetic flux leaked from the flat bent shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflecting device mounted on an in-line type cathode ray tube and a display device such as a television receiver or a computer provided with the deflecting device.

[0002]

2. Description of the Related Art A conventional display device for a television receiver or a computer has a cathode ray tube (hereinafter referred to as a CRT) 10 provided in a housing of the display device as shown in FIG.
The CRT 10 includes a panel unit 11 for displaying a display image,
It is composed of a glass tube composed of a funnel-shaped funnel 12 and a cone 14 connecting the funnel 12 and the tubular neck 13. Inside the panel 11, red (R), green (G), and blue ( A phosphor screen (not shown) in which the respective color phosphors of B) are arranged in a predetermined pattern and an aperture grill (not shown) serving as a color selection mechanism are provided. an electron gun 15 which includes is provided on the cone portion 14 (hereinafter referred to as deflection yoke) deflection device for deflecting in-line-shaped electron beam B _R emitted from the electron gun 15, B _G, and B _B 16 is mounted I have.

The electron beam B _R emitted from the electron gun 15,
B _G, B _B is emitted from the tube axis direction of the neck portion 13 (Z-axis direction), the inner surface of the panel 11 by the deflection yoke 16, the horizontal scanning L in the X axis direction, Y axis direction to a vertical scanning V
Is done.

FIG. 7 is a partially cutaway side view of a deflection yoke mounted on the CRT of FIG. 6, and FIG. 9 is a side sectional view of a half of FIG. 7, in which a deflection yoke 16 is formed in a funnel shape. A saddle-type horizontal deflection coil 17 is provided inside a separator 19 made of synthetic resin or the like, and a saddle-type vertical deflection coil 18 is provided outside the separator 19. Further, a funnel-shaped ferrite or the like is provided on the outer periphery of the vertical deflection coil 18. Core 2 made of magnetic material
0 is provided. The core 20 is a horizontal and vertical deflection coil 1
In order to further increase the magnetic fields of the coils 7 and 18 and to correct the frame distortion by the frame correction coil 22, the ring magnet 21 is connected to the electron gun 15.
Is provided at the rear of the deflection yoke 16 (on the side of the electron gun 15) in order to correct the assembly error.

The horizontal deflection coil 17 and the vertical deflection coil 18 are formed in a saddle shape as shown in FIGS. 8A and 8B. FIG. 8A is a perspective view showing a case where a half of the horizontal deflection coil 17 is wound in a saddle shape using a winding die, and front and rear bend-up portions 17F and 17B are formed in a semicircular shape. FIG. 8B shows a horizontal deflection coil 17 for reducing deflection power in which the front bend-up portion 17F has a rectangular shape and the rear bend-up portion 17B has a semicircular shape.

The front bend-up portion 17F and the rear bend-up portion 17B of the saddle-type horizontal deflection coil 17 are inserted into the front bend storage portion 19F and the rear bend storage portion 19B of the separator 19 as shown in FIG. The bend-up portions before and after the saddle type vertical deflection yoke 18 are also provided in the bend storage portions 19.
F and 19B are located between the rear and front walls.

The Z in the tube axis direction (Z-axis direction) of the neck portion 13 of the CRT 10 of the horizontal deflection coil 17 having such front and rear bend-up portions (crossover portions) 17F and 17B.
= 0 position on the reference line (design origin) of the CRT 10, and the Z behind the rear bend-up portion 17B.
FIG. 10 shows measurement points of the magnetic field in the ± X-axis directions of Z ₁ , Z ₂ , and Z _{3 on} the axis.

FIG. 11 shows Z at such a measurement point.₁=
-50mm, Z_Two= -55mm, Z _Three= -60mm
The strength of the magnetic field at a distance in the ± X-axis direction (± 15 mm) is plotted.
It shows the measurement results obtained from this curve.
Changes in magnetic field strength at the left and right ends (L / R) of ± X axis on Z axis
It turns out that the conversion is relatively small.

In contrast to the horizontal deflection coil 17 of the deflection yoke 16 as described above, the rear bend-up portion 17B extends along the semi-circular tube wall of the CRT 10 in the Z-axis as shown in FIGS. A saddle-type horizontal deflection coil 17 having a rear flat bend portion 17B 'extending toward the electron gun 15 has been proposed. FIG. 12A shows a round type horizontal deflection coil, and FIG. 12B shows a square type horizontal deflection coil.

The horizontal deflection coil 17 having such a flat bend portion 17B 'has the same Z = Z ₁ ,
FIG. 13 shows measurement points of the strength of the magnetic field on the ± X axis on Z ₂ and Z ₃ , and FIG. 14 shows the measurement results as in FIG.

The results of the above comparison show that, when the rear bend-up portion 17B is formed as a flat bend portion 17B ', the magnetic field changes greatly as the distance from the center of the X-axis to the ± X-axis direction increases. The magnetic field distortion becomes larger than that in the case of (1).

Further, a magnetic field control element (Field
Four magnetic pieces are fixed diagonally along the Z-axis of the CRT at the rear end of the deflection yoke at the rear end of the deflection yoke in order to correct the coma aberration generated in the diagonal direction of the center raster of the panel generated by using the controller. Such a deflection yoke is disclosed in Japanese Patent Application Laid-Open No. 55-157846.

[0013]

FIG. 15 is a side sectional view showing the vicinity of the rear portion of the horizontal deflection coil 17 provided with the rear bend-up portion 17B and the flat bend portion 17B 'as described above.
The difference between the measurement results of FIGS. 11 and 14 will be described with reference to FIGS.

As shown in FIGS. 15A and 15B, the rear bend-up portion 17B and the rear flat bend portion 17 are provided.
The magnetic field generated from the main winding 17M of the horizontal deflection coil 17 having B ′ has a main magnetic field φ _M and a leakage magnetic flux φ as shown by a solid line.
Occurs in the _L direction. On the other hand, the rear bend up section 17B
And main magnetic field phi _M and the leakage magnetic field phi _L from the magnetic field direction together both main winding portion 17M generates a bend field phi _B shown by the broken line generated from the rear flat bend 17B 'is bend field phi _B It occurs in the direction of offset.

Therefore, the electron gun 15 side of the Z axis of the CRT 10
Deflection with a flat bend 17B '
The coil 17 has a leakage magnetic field φ_LBend magnetic field to offset
Generation center position distance is R₁> R_TwoBecome flat bend
The horizontal deflection coil 17 having the portion 17B 'is canceled.
And the effective diameter of the magnetic field φ₁And φ _Two
Is φ₁> Φ_TwoIt has become.

Therefore, in other words, the small effective diameter φ ₂ of the magnetic field at the end of the saddle-shaped horizontal deflection coil 17 having the rear flat bend portion means that the distortion magnetic field (barrel magnetic field) of the leakage magnetic field φ _L is large and the distortion (barrel magnetic field) is large. 14), this causes a relatively large change in the magnetic field strength in the ± X-axis direction as shown in FIG.

In order to cancel out such a barrel-shaped distortion magnetic field of the leakage magnetic field φ _L , it is necessary to distort the generated magnetic field φ _M of the main winding 17M into a pin shape.

When considering the deflection yoke 16 as a whole, the CRT 1
0, the convergence takes place over the entire area of the screen of the panel unit 11, but the main winding 17M is used to cancel the leakage magnetic field φ _L.
Large main magnetic field φ for a beam of the neck 13 as seen from the panel side of the CRT10 as shown in FIG. 16 (A) is _M are making strain field of pin-shaped, right of the red electron beam B _R of the panel section 11 of When viewed on the right side of the panel section 11 due to the pin distortion, the electron beams B _R , B _G , B
Red electron beam B _R pin field of _B (vertical magnetic field)
Receive a large convergence effect. Now, when to just focus the high visibility green electron beam B _G, red electron beam B _R becomes the over-focus, blue electron beam B _B is a under-focus red electron beam B electron beam spot B _R of _R ' Becomes larger, and the blue electron beam B _B ′ becomes smaller.

FIG. 12A, which is caused by the factors described above,
(B) Red, green, and blue electron beam spots B _R , B _G , B projected on the panel section 11 of the CRT 10 by a deflection yoke 16 using a horizontal deflection coil 17 having a flat bend section 17B ′ as shown in FIG. _B has a beam spot size of B _R ′> B _B ′ within a range of, for example, 2 to 3 cm (depending on the size of the screen) from the right end of the right side of the screen of the panel unit 11 as shown in FIG. the left side of the screen panel portion 11 size of the beam spot has a _B B '> B _R'.

On the other hand, the deflection yoke disclosed in Japanese Patent Application Laid-Open No. 55-157846 is provided with a distortion correcting means at the rear of the deflection yoke in order to correct the coma aberration (defective sensitivity) of the deflection yoke. other B on the sensitivity of B _G not sufficiently against the action the action of the vertical deflection magnetic field with respect to the other two red and blue electron beam B _R, B _B is for green electron beam B _G generated by the panel center _R, are those sensitivity of B _B corrects the diagonal direction of the coma aberration of the screen of the panel portion caused by insufficient, the strain to be Hodokoso correction of the present invention is quite different different.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a deflection yoke using a flat bend type horizontal deflection coil and a display device having the deflection yoke. The point at which the focus at the left or right end of the screen on the panel portion or at the corner of the screen becomes loose is corrected by a simple correction means.

According to a first aspect of the present invention, there is provided a deflection yoke in which a rear portion of a saddle-type horizontal deflection coil 17 has a flat bend portion 17B '.
The magnetic field compensating means 23 is arranged such that side beams of beams arranged in-line in the horizontal direction (X-axis) behind the rear end of the flat bend portion 17B 'of FIG. The deflection yoke 16 is used.

According to the first aspect of the present invention, the spot size of the left and right blue and red electron beams on the panel screen due to the pin distortion of the main magnetic field caused by the flat bend-shaped saddle-type horizontal deflection coil is reduced. Good focus can be obtained around the suppression screen.

According to a second aspect of the present invention, the magnetic field correction means is a pair of magnets 23 arranged in a horizontal direction so as to cancel the barrel magnetic field of the side beams arranged in-line. The deflection yoke 16 of FIG.

According to the second aspect of the present invention, it is possible to correct barrel-shaped distortion in the X-axis direction of the horizontal deflection coil with a pair of magnets.

According to a third aspect of the present invention, there is provided the magnet
3. The device according to claim 1, wherein the third member is disposed between the neck portion of the CRT and the neck portion of the separator mounted on the horizontal deflection coil or on the outer periphery of the neck portion of the separator. The deflection yoke 16 of FIG.

According to the third aspect of the present invention, the rear flat bend portion 17B 'of the horizontal deflection coil is arranged to cancel the barrel-shaped leakage magnetic field formed by the rear flat bend portion 17B' formed in the horizontal deflection coil 17. By arranging them at the rear, the right and left electron beam spot sizes of red and blue can be appropriately adjusted.

According to a fourth aspect of the present invention, there is provided a display device having a deflection yoke 16 having a flat bend portion 17B 'at the rear of the saddle-shaped horizontal deflection coil 17, wherein the flat bend portion 17B of the horizontal deflection coil 17 is provided. Magnetic field correcting means 2 for pulling side beams of beams arranged in-line in the horizontal direction (X-axis) behind the rear end toward each other in the deflection direction
3 is provided with a deflection yoke 16 in which the display device 3 is disposed.

According to the fourth aspect of the present invention, the spots of the left and right blue and red electron beams on the panel screen due to the pin distortion of the main magnetic field caused by the flat bend-shaped saddle type horizontal deflection coil. A good focus screen can be obtained around the screen while suppressing an increase in size.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A deflection device (deflection yoke) according to the present invention.
A display device provided with this deflection yoke will be described in detail with reference to FIGS. 6 to 16 are denoted by the same reference numerals, and the description will proceed.

FIG. 1 is a side view of the present invention showing one embodiment of a deflection yoke corresponding to FIG. 7 of the related art, and FIG. 2 is a half body of the present invention showing another embodiment of the deflection yoke corresponding to FIG. FIG.

FIG. 1 shows a frame correction coil 2 of a separator 19.
A pair of plate-like magnets 23 as a magnetic field correction means is placed on the separator neck 19A formed so that the separator 19 surrounds the neck 13 of the CRT 10 by extending the space between the ring magnet 2 and the mounting portion of the ring magnet 21. 1
This is a case where the light emitting device is disposed to face the X-axis direction (horizontal direction) of 9A.

A different point from FIG. 9 in the half deflection yoke 16 of another embodiment shown in FIG.
Funnel-shaped separator 1 of deflection yoke 16 mounted on
9 denotes a rear flat bend portion 17 of a horizontal deflection coil 18.
An extension 17C that can accommodate, for example, a pair of magnets 23 of the magnetic field correction means is provided following the terminal end of B '.

FIG. 2B is a side sectional view in the case where the extension portion 17D capable of accommodating the magnet 23 is provided below the frame correction coil 22.

FIG. 3 is a sectional view taken along the line AA 'of FIG. 1, and FIG. 4 is a sectional view taken along the line BB' and CC 'of FIGS. 2 (A) and 2 (B). Yes, in the case of FIG.
On the left side in the X-axis direction perpendicular to the Z-axis of the CRT 10 on the outer wall of the separator neck portion 19A.
A flat and rectangular plastic magnet (or rubber magnet) 23L is provided along the tube wall of the neck portion 13 of the 0, and one end of the rectangular magnet 23L, for example, the upper side is an N pole and the lower side is an S pole. Magnetize.

Similarly, a flat rectangular plastic magnet (or rubber) along the tube wall of the neck portion 13 of the CRT 10 is provided on the right side in the X-axis direction perpendicular to the Z-axis of the CRT 10 on the separator neck portion 19A. magnet)
23R is disposed so as to face the magnet 23L, and the upper end, which is one end of the rectangular magnet 23R, is magnetized to the S pole and the lower side to the N pole.

FIG. 4 shows a magnet having the same structure as that of FIG.
This is a case where it is provided between the outer periphery of the tube wall of the neck portion 13 of T10 and the extending portion 17C or 17D of the separator 19.

A flat bend type horizontal deflection coil 1
In FIG. 7, since the rear bend-up portion 17B is not formed as shown in FIGS. 12A and 12B, there is no rear bend storage portion 19B as shown in FIG. A hook portion 19B is formed at a rear portion of the horizontal deflection coil 17 at the rear end of a window portion 17W formed as a triangular space portion of the horizontal deflection coil 17 shown in FIGS. 12A and 12B. A) and insertion as shown in FIG. 2 (B) to prevent displacement in the B direction. The front bend-up portion 17F is fixed on the opening side of the separator 19 with an adhesive such as hot melt.

The magnet 23 as the above-described magnetic field correction means
The magnetic field canceling operation when the L and 23R are mounted on the neck portion 13 of the CRT 10 will be described with reference to FIGS. 5 (A) to 5 (C).

FIG. 5A shows the leakage magnetic flux φ _L in the neck portion 13 on the XY plane at the rear end in FIG. 15B and generates a barrel-shaped magnetic field. The direction of the magnetic field indicates the direction when the screen projected on the panel unit 11 of the CRT 10 is deflected to the right when viewed from the front.

FIG. 5B shows the magnetic field generated by the magnets 23L and 23R of the present invention. The generated magnetic field φ _Mg of the magnet in the neck of the pair of magnets 23L and 23R from the N pole to the S pole is pin-shaped. Produces a magnetic field of

FIG. 5C shows the composite magnetic field φ _CM of FIGS. 5A and 5B. When the right side of both surfaces is deflected, the left magnet 23L cancels out and the right magnet 23R
In the magnetic field, such as pulled outside of the added X-axis direction of the red electron beam B _R neck portion 13 (right side) is synthesized.

[0042] Although not shown on the same principle a magnetic field, such as pulled in the main direction of the deflection magnetic field phi _M is an electron beam B _B blue reversed outside (left side) when deflected to the left screen is synthesized.

Although the above-described magnetic field correcting means has been described using an example using a magnet, it is apparent that the magnetic field correcting means may be constituted by a coil or the like.

According to the deflection yoke and the display device of the present invention, by using a flat bend type horizontal deflection coil, a magnetic core made of ferrite or the like can be used without being divided, and the deflection yoke obtained by the flat bend type can be downsized. In addition, it is possible to obtain good focus around the screen while reducing the deflection power without impairing the effects of improving the deflection sensitivity and increasing the neck shadow margin.

[0045]

According to the deflection yoke and the display device having the deflection yoke of the present invention, the following effects can be obtained. 1) The deflection power can be reduced, and good focus can be obtained around the screen. 2) The structural magnetic field distortion can be improved by a simple method without a significant change. 3) It is possible to maintain the productivity improvement because the ferrite core, which is an advantage of flat bend, can be used without being divided.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a deflection yoke according to the present invention.

FIG. 2 is a side sectional view of a half showing another embodiment of the deflection yoke of the present invention.

FIG. 3 is a sectional view taken along the line AA 'in FIG.

FIG. 4 is a sectional view taken along arrows BB ′ and CC ′ of FIG. 2;

FIG. 5 is an operation explanatory view of the deflection yoke of the present invention.

FIG. 6 is a perspective view of a cathode ray tube applicable to the display device of the present invention.

FIG. 7 is a side view of a conventional deflection yoke.

FIG. 8 is a perspective view of a horizontal deflection coil used in a conventional deflection yoke.

FIG. 9 is a side sectional view of a half of a conventional deflection yoke.

FIG. 10 is a diagram showing measurement points of the magnetic field strength of the horizontal deflection coil shown in FIG. 8;

11 is an actual measurement graph of measurement points in FIG.

FIG. 12 is a perspective view of another horizontal deflection coil used for a conventional deflection yoke.

FIG. 13 is a diagram showing measurement points of the magnetic field strength of the horizontal deflection coil shown in FIG.

14 is an actual measurement graph of measurement points in FIG.

FIG. 15 is an explanatory diagram of a generated magnetic field for explaining a magnetic field behind a conventional horizontal deflection coil.

FIG. 16 is an explanatory diagram of a cause of generation of electron beam spots on both sides on a screen.

[Explanation of symbols]

10 ‥‥ cathode ray tube (CRT), 11 ‥‥ panel unit, 14
{Cone part, 15} electron gun, 16} deflection device (deflection yoke), 17} saddle type horizontal deflection coil, 18} vertical deflection coil, 19} separator, 20} magnetic core, 23} ‥ Magnetic field correction means (magnet)

Claims (4)

[Claims] 1. A deflection device in which a rear portion of a saddle-type horizontal deflection coil has a flat bend portion, wherein the horizontal deflection coil is arranged in-line in a horizontal direction (X-axis) behind a rear end of the flat bend portion. A deflecting device comprising magnetic field correcting means for pulling side beams of a beam toward each other in a deflection direction. 2. The deflecting device according to claim 1, wherein said magnetic field correction means is a pair of magnets arranged in the horizontal direction so as to cancel a barrel magnetic field of side beams arranged in line. 3. The magnet according to claim 1, wherein the magnet is disposed between a neck of the cathode ray tube and a neck of the separator to which the horizontal deflection coil is mounted or on an outer periphery of the neck of the separator. The deflection device according to claim 2. 4. A display device provided with a deflection yoke having a rear portion of a saddle-type horizontal deflection coil as a flat bend portion, wherein the horizontal direction (X-axis) behind the rear end of the flat bend portion of the horizontal deflection coil is provided. And a deflection yoke provided with magnetic field correction means for pulling side beams of the beams arranged in-line toward each other in the deflection direction.