JP3061938U - Electronic beam deflection device - Google Patents

Abstract

(57) Abstract: A ventless electron beam deflecting device capable of easily adjusting a color shift of an image in a color display tube. SOLUTION: An XH correction piece 51 composed of a ferrite core extending in the circumferential direction and movable in the direction of the axis P is mounted on the outer periphery of the vertical deflection coil 30 on the neck side, and the outer periphery of the vertical deflection coil 30 on the neck side is provided. An upwardly extending Y made of a ferromagnetic material extending in the circumferential direction and movable in the direction of the axis P and in the circumferential direction.
H Attach the cross correction piece 53.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a ventless electron beam deflecting device capable of easily adjusting a color shift of an image in a color display tube.

[0002]

[Prior art]

Electron tubes for displaying color images (hereinafter, referred to as “color display tubes”) used in televisions, computer displays, and the like are, as indicated by reference numeral 100 in FIG. 7, R (red), G (green), and B (blue), respectively. A tubular neck 110 incorporating emission units 101R, 101G, 101B for emitting three electron beams E _R , E _G , E _B carrying image signals corresponding to the three primary colors of light, and this neck 110 And a display section 120 on which a matrix of fluorescent dots for emitting an R, G, B light to display an image by the projection of the electron beam emitted from the emission section is formed. ing . The outer periphery of the tube leading to the display unit 120 from the neck 110 of the color display tube 100, the electron beam E _R, E _G, electron beam deflection device for deflecting the path of E _B in the horizontal and vertical directions 200 is mounted.

The electron beam deflecting device 200 used in the color display tube 100 is generally coaxial with the axis P of the color display tube 100 and at the neck of the color display tube 100 as shown in FIGS. A pair of horizontal deflection coils 210, 210 which are formed in a tubular shape whose diameter gradually increases from the side toward the display unit, and are vertically opposed to each other, and a coil in which the horizontal deflection coils 210, 210 are mounted on the inner surface. A pair of vertical deflection coils 230, 230 are formed along the outer periphery of the separator 220 via a separator 220 and are arranged to face each other in the horizontal direction. Further, an annular ferromagnetic core (ferrite core) ) 240.

In the electron beam deflector 200, a pair of horizontal deflection coils 210 and 210 apply a vertical magnetic field to the paths of the electron beams E _R , E _G and E _{B so} that the electron beams E _R , E _G and E _B are moved in the horizontal direction. The pair of vertical deflection coils 230 and 230 have a function of vertically deflecting the electron beam by applying a horizontal magnetic field to the path of the electron beam. The coil separator 220 separates the horizontal deflection coil 210 and the vertical deflection coil 230 from each other and supports them so that their positions do not shift. The ferromagnetic core 240 is mounted in order to increase the density of magnetic flux formed in the path of the electron beam E _R, E _G, E _B by the horizontal deflection coil 210 and vertical deflection coil 2 30.

As shown in FIG. 9, the horizontal deflection coil 210 is generally formed in a saddle shape whose diameter gradually increases from the neck of the color display tube toward the display. The conventional horizontal deflection coil is called a "vent type", and has a portion in which the electric wire rises in the radial direction with respect to the axis P and is wound, that is, a vent portion 211 is formed on the neck side. In the bent type electron beam deflecting device, the vertical deflection coil 230 is also formed into a substantially similar shape, and a similar vent portion 231 is formed.

However, the vent type has a complicated assembly procedure. For example, the ferromagnetic core 240 and the like cannot be mounted unless the split type is used. For example, as shown in FIG. 6, an example of a horizontal deflection coil is a so-called “ventless type” horizontal deflection coil and a vertical deflection coil which only gradually expands in diameter from the neck to the display side and lacks a vent. Coils have come to be used.

In this ventless type electron beam deflector, the horizontal deflection coil 210 and the vertical deflection coil 230 only unilaterally increase in diameter from the neck side to the display unit side. The flange-shaped vent portions 211 and 231 are not formed. Therefore, when assembling the electron beam deflector, a pair of vertical deflection coils 230 and 230 are mounted on the outer surface of the coil separator 220 having a pair of horizontal deflection coils 210 and 210 mounted on the inner surface, and then the outer periphery thereof is mounted. The above-described annular ferromagnetic core 240 may be simply fitted and the fitted ferromagnetic core 240 may be bonded and fixed to the coil separator 220 using a hot melt adhesive or the like. The device has the advantage that the number of parts and the number of assembly steps can be significantly reduced.

As described above, the electron beam deflector 200 is mounted coaxially with the axis P of the color display tube 100. However, the electron beam emitting units 101R, 101G, and 101B in the color display tube have a configuration in which 101G is located at the position of the axis P and 101R and 101B are disposed on the left and right sides thereof, as shown in FIG. Therefore, when the three electron beams E _R , E _G , and E _B are deflected in the horizontal and vertical directions by the electron beam deflector 200, the electron beams E _R and E _B off the axis P are focused. Each corner changes, and the display unit 120 collides with a fluorescent dot different from a predetermined fluorescent dot, causing a color shift in the image.

As shown in FIG. 3, the type of the color misregistration is a case where the spread angle of the R image and the B image in the horizontal (H) direction on the image plane of the display unit 120 is different (hereinafter, referred to as “ XH shift), as shown in FIG. 4, when the vertical (V) axis of the R image and the B image intersect at an angle (hereinafter referred to as “YH cross”), FIG. As shown in the figure, it is recognized that the spread angle of the R image and the B image in the vertical (V) direction is different (hereinafter, referred to as “YV shift”). These color shift, the electron beam E _R, not only from the displacement of the axis P of E _B and the electron beam deflection device 200, electron beam deflection device Ya both axial deviation when mounting the color display tube These color shifts need to be corrected for each individual display device because they also occur due to inclination and the like.

In order to correct these color shifts, various types of correction means are provided in the conventional vent type and ventless type electron beam deflectors. For example, with respect to the XH displacement described above, in the bent-type electron beam deflector, an XH correction piece made of a vertical rod-shaped iron piece or a ferrite core is mounted on one side in the horizontal direction of the vent portions 211 and 231. The piece is moved and adjusted with respect to the axis P in the perspective direction for correction. In addition, for a YH cross, for example, in a ventless electron beam deflector, an arc-shaped iron piece along the outer circumference is provided on the neck side outer circumference straddling the upper or lower boundary of the pair of vertical deflection coils 230, 230. Is attached, and is moved and adjusted in the direction of the axis P (neck side-display section side) to correct.

[0011]

[Problems to be solved by the invention]

 However, since the ventless electron beam deflecting device lacks the vent portions 211 and 231, the correcting means used in the vented electron beam deflecting device has no effect on the XH deviation. Also, no simple and effective means for correcting the YV deviation in a ventless type electron beam deflector has been found. The present invention has been made to solve the above-mentioned problem, and therefore, the purpose thereof is to easily perform the above-described XH shift correction, YH cross correction and YV shift correction in a ventless electron beam deflector. An object of the present invention is to provide an electron beam deflecting device capable of performing the above-described operations.

[0012]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, the present invention is directed to a ventless-type electron beam deflecting device according to claim 1, wherein at least one of the pair of vertical deflecting coils is provided on the outer periphery of the neck side. Provided is an electron beam deflector provided with an XH correction piece made of a ferrite core extending in a direction and movable in an axial direction. The XH shift piece made of the ferrite core can correct the XH shift by moving its mounting position in the axial direction. In this case, it was found that the desired XH correction effect could not be obtained if iron pieces were used instead of the ferrite core.

In the above, the surface of the XH correction piece facing the vertical deflection coil is preferably formed in a concave shape along the peripheral surface of the vertical deflection coil. As a result, the opposing area between the XH correction piece and the deflection coil increases, and a large correction effect can be obtained.

In the above, a coil cover is attached to the outer periphery of the neck portion of the vertical deflection coil, and a guide rail for supporting the XH correction piece movably in the axial direction is provided on the coil cover. preferable. Thus, the adjustment of the optimum position of the XH correction piece can be easily performed by sliding the guide rail back and forth while monitoring the image displayed on the display section of the color display tube. Thereafter, the XH correction piece can be easily fixed to the coil cover with a hot melt adhesive or the like.

[0015] The present invention is also a ventless type electron beam deflecting device according to claim 4, wherein the pair of vertical deflecting coils extend in a circumferential direction on an outer periphery of a neck portion straddling at least one of upper and lower boundaries. Provided is an electron beam deflecting device equipped with a YH cross correction piece made of a ferromagnetic material which is movable in the axial direction and the circumferential direction. The electron beam deflector can perform the YH cross correction by moving the position of the YH cross correction piece in the axial direction, and when the YH cross correction piece is moved in the circumferential direction, the YV cross correction can be performed. It could be easily corrected.

In the above, it is preferable that a surface of the YH cross correction piece facing the vertical deflection coil is formed in a concave shape along a peripheral surface of the vertical deflection coil. As a result, the opposing area between the YH cross correction piece and the deflection coil increases, and a large correction effect can be obtained.

In the above, a coil cover is attached to the outer periphery of the neck portion of the vertical deflection coil, and the coil cover is provided with a guide plate that enables the YH cross correction piece to move in the axial direction and the circumferential direction. Is preferred. This makes it possible to easily adjust the optimum position of the YH cross correction piece by moving the guide plate back and forth and circumferentially while monitoring the image displayed on the display section of the color display tube. After the adjustment, the YH cross correction piece can be easily fixed to the coil cover by using a hot melt adhesive or the like.

Here, the YH cross correction piece has a plurality of projections or ridges extending in the axial direction arranged in the axial direction, and the guide plate has a plurality of grooves extending in the axial direction. It is preferable that the YH cross correction piece is fixed to the coil cover by the engagement of the protrusion or the ridge of the cross correction piece with the groove. In this case, the YH cross correction piece can be slid in the axial direction without inadvertent displacement in the circumferential direction in a state where the protrusion or the ridge is engaged with the groove of the coil cover. At the same time, when the projection or the ridge gets over the groove, the protrusion or the ridge can be moved in the circumferential direction in a click manner, and the YV displacement can be accurately corrected.

[0019]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings using examples. FIG. 1 shows an electron beam deflector according to an embodiment of the present invention. The electron beam deflector 1 is of a so-called ventless type, and is entirely formed into a tube whose diameter gradually increases from the neck of a color display tube (not shown) toward the display portion. A pair of horizontal deflection coils 10 and 10 arranged vertically opposed, and a coil separator 20 formed in a tubular shape whose diameter gradually increases from the neck side to the display unit side, are arranged horizontally opposed to each other. The pair of vertical deflection coils 30 and 30 (only one of them is shown in FIG. 1) and an annular ferromagnetic core 40 made of ferrite are respectively built in a self-contained manner. . In the following description, “neck side” means the direction of the neck of the color display tube, and “display side” means the direction of the display unit of the color display tube.

In the electron beam deflector 1, a substantially cylindrical coil cover 50 is mounted on the outer periphery of the neck of the vertical deflection coil 30. An XH correction piece 51 made of a ferrite core extending in the circumferential direction and movable in the direction of the axis P is attached to the coil cover 50 so as to face the outer periphery of the neck of one of the vertical deflection coils 30. ing.

As shown in FIG. 2, the coil cover 50 is provided with guide rails 52, 52 extending on the outer circumference in the direction of the axis P, and the XH correction piece 51 is provided with the guide rails 52. , 52 so as to be slidable in the direction of the axis P. The XH correction piece 51 has a surface 51a facing the vertical deflection coil 30 formed in a concave shape along the peripheral surface of the vertical deflection coil 30.

The electron beam deflecting device 1 is attached to a color display tube in a process of assembling the display device, and then, while monitoring a display image of the color display tube, moves the XH correction piece 51 back and forth along the axis P (the neck). Part-display part side), find the position where the deviation between the R image and the B image in the horizontal (H) direction is minimum on the image surface, and attach the XH correction piece 51 with the hot melt adhesive to the coil cover 50. By adhesively fixing the display device, a display device in which the XH deviation is corrected can be obtained. Further, by adjusting the movement of the XH correction piece 51, not only the XH deviation but also the YV deviation can be reduced.

The above-mentioned coil cover 50 also has an outer periphery that straddles the upper boundary (the V direction in FIG. 2) of the pair of vertical deflection coils 30, extends in the circumferential S direction, and extends in the axis P direction and the circumferential direction. A YH cross correction piece 53 made of an iron piece movable in the S direction is mounted. The YH cross correction piece 53 is curved in a concave shape along the peripheral surface of the vertical deflection coil 30, and is placed on a guide plate 54 provided on the peripheral surface of the coil cover 50. While being held by guide rails 55 provided on both sides of the shaft 54 and extending in the direction of the axis P, it is movable in the direction of the axis P and in the direction of the circumference S.

The YH cross correction piece 53 is provided with a handle 56 projecting upward so as to be movable by hand, and two downward projections 57, 57 arranged in the direction of the axis P. Are formed. A plurality of grooves 58 extending in the direction of the axis P are formed in the guide plate 54. When the YH cross correction piece 53 is placed on the guide plate 54, the protrusions 57 engage with any of the grooves 58, and the protrusions 57 ride over the grooves 58. Unless otherwise, the YH cross correction piece 53 can be moved only in the direction of the axis P.

The electron beam deflecting device 1 is attached to the color display tube in the process of assembling the display device, and then the handle 56 is used to move the YH cross correction piece 53 along the axis P while monitoring the display image of the color display tube. If it is slid forward and backward (neck side-display side), the YH cross where the vertical (V) axis of the R image and the B image intersect can be corrected. When the handle 56 is turned in the circumferential (S) direction, the projections 57, 57 get over the groove 58, and the YH cross correction piece 53 moves in the circumferential (S) direction in a click manner, and the R image and the B image are moved. YV shift in which the spread angle in the vertical (V) direction deviates from the above. After the correction of the YH cross and the YV deviation is completed, the display device in which the YH cross and the YV deviation are corrected can be obtained by bonding and fixing the YH cross correction piece 53 to the coil cover 50 with a hot melt adhesive. .

[0026]

[Effect of the invention]

 The electron beam deflecting device according to the first aspect of the present invention is an XH compensator comprising a ferrite core extending in the circumferential direction and movable in the axial direction on the outer periphery of at least one of the pair of vertical deflection coils on the neck side. Since X is mounted, it is possible to easily correct the XH shift in which the R image and the B image are shifted in the horizontal (H) direction on the image plane. The electron beam deflecting device according to the fourth aspect of the present invention extends in the circumferential direction and can move in the axial direction and the circumferential direction on the neck-side outer circumference straddling at least one of the upper and lower boundaries of the pair of vertical deflection coils. Since the YH cross correction piece made of a ferromagnetic material described above is attached, the YH cross where the vertical (V) axis of the R image and the B image intersect on the image plane, and the vertical (V) It is possible to easily correct the YV deviation in which the spread angle in the direction V) is shifted.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing the coil cover of the embodiment shown in FIG. 1;

FIG. 3 is a conceptual diagram illustrating an XH shift on an image plane of a color display tube.

FIG. 4 is a conceptual diagram illustrating a YH cross on an image plane of a color display tube.

FIG. 5 is a conceptual diagram illustrating a YV shift on an image plane of a color display tube.

FIG. 6 is a perspective view showing an example of a ventless horizontal deflection coil.

FIG. 7 is a sectional view showing a general configuration of a color display tube and an electron beam deflector.

FIG. 8 is a perspective view showing a general configuration of an electron beam deflecting device.

FIG. 9 is a perspective view showing an example of a vent type horizontal deflection coil.

[Explanation of symbols]

 1: Electron beam deflection device 10: Horizontal deflection coil 20: Coil separator 30: Vertical deflection coil 40: Ferromagnetic core 50: Coil cover 51: XH correction piece 51a; Surface 52: Guide rail 53: YH cross correction piece 54: Guide Plate 55: guide rail 56: handle 57: projection 58: groove P: axis S: circumference (direction) H: horizontal (direction) V: vertical (direction)

Claims (7)

[Utility model registration claims] 1. A ventless type electron beam which is formed in a tubular shape and surrounds a path of an electron beam in a color display tube and gradually expands in diameter from a neck portion to a display portion side coaxially with the color display tube. A deflecting device, wherein the electron beam deflecting device has a pair of horizontal deflection coils arranged vertically opposed to each other, and a pair of vertical deflection coils arranged horizontally opposed to each other on the outer periphery thereof. An XH correction piece comprising a ferrite core extending in the circumferential direction and movable in the axial direction is mounted on at least one of the pair of vertical deflection coils on the neck side outer periphery. Beam deflecting device. 2. The electron beam deflector according to claim 1, wherein a surface of said XH correction piece facing said vertical deflection coil is formed in a concave shape along a peripheral surface of said vertical deflection coil. . 3. A coil cover is mounted around the neck of the vertical deflection coil, and the coil cover is provided with a guide rail for supporting the XH correction piece movably in an axial direction. Item 2. An electron beam deflector according to Item 1. 4. A ventless type electron beam which is formed in a tubular shape so as to surround a path of an electron beam in a color display tube and to gradually increase in diameter from a neck side to a display portion side coaxially with the color display tube. A deflecting device, wherein the electron beam deflecting device has a pair of horizontal deflection coils arranged vertically opposed to each other, and a pair of vertical deflection coils arranged horizontally opposed to each other on the outer periphery thereof. A ferromagnetic material that extends in the circumferential direction and is movable in the axial direction and the circumferential direction on the neck-side outer circumference straddling at least one of the upper and lower boundaries of the pair of vertical deflection coils;
An electron beam deflector having an H cross correction piece mounted thereon. 5. The electron beam deflecting device according to claim 4, wherein a surface of said YH cross correction piece facing said vertical deflection coil is formed in a concave shape along a peripheral surface of said vertical deflection coil. apparatus. 6. A coil cover is mounted on the outer periphery of the neck of the vertical deflection coil, and a guide plate is provided on the coil cover so as to move the YH cross correction piece in the axial direction and the circumferential direction. The electron beam deflector according to claim 4, wherein 7. The YH cross correction piece has a plurality of projections or ridges extending in the axial direction arranged in the axial direction, and the guide plate has a plurality of grooves extending in the axial direction. 7. The electron beam deflecting device according to claim 6, wherein the YH cross correction piece is fixed to the coil cover by engaging a protrusion or a ridge of the cross correction piece with the groove.