JP2005285747A - Deflection device for projection tube, and the projection tube device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently compensate for upper and lower pin cushion distortions, while improving deflection efficiency and reducing change of shape of beam spot. <P>SOLUTION: A deflection device 24 for a projection tube is provided with a main deflection device 25 for generating raster and an auxiliary deflection device 29 for compensating convergence. The auxiliary deflection device 29 is provided with a troidal type auxiliary horizontal coil 30, a saddle type auxiliary vertical coil 31, and a ferrite core 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a deflection device for a projection tube and a projection tube device having the same.

  In recent years, projection-type projection televisions have become widespread due to market demands for larger screens and lower prices. FIG. 1 is a schematic diagram showing a configuration of a projection television. Projection tube devices 1 to 3 corresponding to the respective colors of red, green, and blue are provided, and a deflection device 4 is provided in each of the projection tube devices 1 to 3. Rasters generated from the projection tube apparatuses 1 to 3 of the respective colors are projected on the screen 5 to form a color image.

  FIG. 2 is a side view of the deflection device 4 included in the projection tube devices 1 to 3 used in the projection type projection television. The main deflection device 6 that generates a raster includes a main horizontal coil 43, a main vertical coil 7, and a main core 8. On the neck side of the main deflection device 6, red, green, and blue projection tube devices (projection tube devices 1 to 3 in FIG. 1) are placed on the projection TV screen 5 due to an error when the projection tube device is assembled to the projection television set. A sub-deflecting device 9 is provided for correcting the generated raster deviation (misconvergence).

  FIG. 3 is a front view of the sub deflection device 9. Here, the tube axis of the projection tube device (projection tube devices 1 to 3 in FIG. 1) provided with the main deflection device 6 is the Z axis, and the horizontal direction orthogonal to the Z axis is orthogonal to the X axis, the X axis, and the Z axis. An XYZ orthogonal coordinate system with the vertical axis as the Y axis is defined. The sub deflection device 9 includes a sub core 10, a sub horizontal coil 11, and a sub vertical coil 12. The sub horizontal coil 11 is wound in a toroidal shape near the position where the X axis of the sub core 10 intersects, and the sub vertical coil 12 is wound in a toroidal shape near the position where the Y axis of the sub core 10 intersects. An appropriate current is supplied to the sub-deflection device 9 having such a configuration, and convergence correction is performed so that an appropriate color image without color misregistration can be obtained on the screen of the projection television (screen 5 in FIG. 1).

  By the way, in the case of the toroidal type sub deflection coil, as shown in FIG. 4A, for example, the deflection magnetic field 13 of the main horizontal coil 43 of the main deflection device 6 is linked to the sub horizontal coil 11 to As shown in B), a pulse-like induced voltage Vt having the same period as the horizontal period is generated between the terminals of the sub-horizontal coil 11. Therefore, in order to perform an appropriate convergence correction, a high voltage for canceling the induced voltage Vt is required as a driving voltage for the sub-deflection device, and there is a problem that power consumption increases.

  Further, as shown in FIG. 5, since the sub horizontal coil 11 and the sub vertical coil 12 are wound in a toroidal shape, the magnetic field generated from the winding existing outside the sub core 10 becomes a leakage magnetic field 14 and contributes to deflection. Therefore, there is a problem that the deflection efficiency is poor.

  A deflecting device that solves these problems is disclosed in Patent Document 1. 6A is a front view of the sub deflection device 19 of Patent Document 1, and FIG. 6B is a side view thereof. The sub-deflecting device 19 includes a saddle-type sub-horizontal coil 15, a saddle-type sub-vertical coil 16, and a sub-core 17. The sub-horizontal coil 15 and the sub-vertical coil 16 are sub-horizontal magnetic field 18 and sub-vertical, respectively. A magnetic field 20 is generated. Since the sub horizontal coil 15 is a saddle type, for example, the number of magnetic fluxes that the deflection magnetic field 13 of the main horizontal coil 43 of the main deflection device 6 is linked to the sub horizontal coil 15 is small. Therefore, the induced voltage Vs generated between the terminals of the sub horizontal coil 15 is smaller than Vt, so that the power consumption can be reduced.

FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. Since the sub deflection device 19 is symmetric with respect to the XZ plane and the YZ plane, only the first quadrant is shown in FIG. Since the sub horizontal coil 15 and the sub vertical coil 16 are both saddle type and the winding is wound inside the sub core 17, the deflection efficiency is better than that of the toroidal type.
JP 2002-330446 A

  However, the deflecting device of Patent Document 1 in which the sub horizontal coil 15 and the sub vertical coil 16 are both saddle type is larger than the deflecting device in which the sub horizontal coil 11 and the sub vertical coil 12 are both toroidal. Although the power consumption can be reduced by reducing the induced voltage due to the main deflection magnetic field generated by the deflection coil, there is a problem that the effect is not yet sufficient. Hereinafter, the reason will be described with reference to FIGS.

FIG. 8 is a graph showing a result of measuring the Y-axis direction component By of the sub horizontal magnetic field 18 generated by the sub horizontal coil 15 along the X axis. As shown in the figure, the Y-axis direction component By becomes maximum when X = 0, and decreases as the distance from X = 0 (that is, the Y-axis) increases. The magnetic field 21 having such an intensity distribution is generally called a barrel type. As shown in FIG. 7, when the winding angle θ _H of the sub horizontal coil 15 is larger than 30 ° and smaller than 90 °, the sub horizontal magnetic field becomes a barrel type magnetic field. Here, the winding angle θ _H is the center point in the circumferential direction centered on the Z axis of the secondary horizontal coil 15 existing in each quadrant partitioned by the XZ plane and the YZ plane on the XY plane, and the Z axis. Defined by an angle formed by a straight line passing through and the X axis. The winding angle at which the deflection efficiency of the sub-horizontal coil 15 becomes the best is θ _H = 0 °. The deflection efficiency decreases as the winding angle θ _H increases, and decreases most at θ _H = 90 °.

The sub horizontal coil 15 has been described above, but the same applies to the sub vertical coil 16. However, the winding angle θ _V of the sub-vertical coil 16 is set in the circumferential direction around the Z axis of the sub-vertical coil 16 existing in each quadrant partitioned by the XZ plane and the YZ plane in the XY plane. It is defined by an angle formed by a straight line passing through the point and the Z axis and the Y axis.

As can be seen from FIG. 7, in the deflection apparatus of Patent Document 1, the inner diameters D _H and D _V of the sub horizontal coil 15 and the sub vertical coil 16 are the same, and the sub horizontal coil 15 and the sub vertical coil 16 interfere with each other. In order to avoid this, both winding angles θ _H and θ _V must be larger than 30 °. Accordingly, the magnetic fields generated by the sub horizontal coil 15 and the sub vertical coil 16 are both barrel-type magnetic fields. Therefore, the deflection efficiency is poor, and the deflection apparatus of Patent Document 1 reduces the induced voltage Vs due to the deflection magnetic field 13 of the main horizontal coil 43 by making both the sub horizontal coil 15 and the sub vertical coil 16 saddle type. Even if it can, power consumption cannot be reduced sufficiently as a whole.

Further, as shown in FIG. 9, it is possible to appropriately set the winding angles θ _H and θ _V by making the inner diameter D _H of the saddle type sub-horizontal coil 15 different from the inner diameter D _{V of the} saddle type sub-vertical coil 16. Is possible. However, in this case, the sub-horizontal coil 15, the sub-vertical coil 16, and the sub-core 17 need to be stacked in order from the Z axis toward the outside, and the inner diameters of the sub-vertical coil 16 and the sub-core 17 are increased. As the distance increases, the deflection efficiency eventually decreases.

  In general, in the case of a projection television, the sub-deflection device also has a function of correcting pincushion distortion at the top and bottom of the screen in addition to the convergence correction function. The power required to correct the pincushion distortion at the top and bottom of the screen is significantly larger than the power consumption at the time of convergence correction. Therefore, in order to efficiently reduce the power consumption in the projection television set, it is important to improve the deflection efficiency of the sub-vertical coil for deflecting in the vertical direction of the sub-deflecting device.

  Further, as described above, in the deflecting device of Patent Document 1, since the sub horizontal magnetic field and the sub vertical magnetic field are both barrel magnetic fields, the spot shape of the electron beam in the peripheral area of the screen changes when the sub deflecting device is operated. FIG. 10 shows a beam spot in the first quadrant of the screen. First, the electron beam 22 on the X axis will be described. Since the sub-horizontal magnetic field is a barrel type, the Lorentz force Fa acting on the electrons 22a closer to the Y axis of the electron beam 22 is larger than the Lorentz force Fb acting on the electrons 22b far from the Y axis of the electron beam 22. . As a result, the electron beam 22 has a vertically long shape as indicated by a dotted line 23, which causes image quality deterioration. For the same reason, the electron beam 22 'on the Y axis has a horizontally long shape as indicated by a dotted line 23' due to the barrel-type sub-vertical magnetic field. For this reason, the cross-sectional shape of the electron beam differs depending on the degree of operation of the sub-deflecting device, and there is a problem that the variation is large among mass-produced deflecting devices.

  In view of the above-described conventional problems, the present invention can improve the deflection efficiency, reduce the beam spot shape change, and can efficiently correct the upper and lower pincushion distortion, and the deflection apparatus. It is an object of the present invention to provide a projection tube device provided with a deflection device.

The projection tube deflection apparatus of the present invention includes a main deflection apparatus for raster generation and a sub deflection apparatus for convergence correction, and the sub deflection apparatus includes a sub horizontal coil, a sub vertical coil, and a ferrite core. In the first projection tube deflecting device, the sub-horizontal coil is a toroidal type coil, and the sub-vertical coil is a saddle type coil. In the second projection tube deflecting device, the sub-horizontal coil is a saddle type coil, and the sub vertical coil is a toroidal type coil. Next, the projection tube device of the present invention is the first of the present invention. Alternatively, a second projection tube deflecting device is provided.

  According to the projection tube deflecting device of the present invention, one of the sub horizontal coil and the sub vertical coil is a toroidal coil and the other is a saddle type coil. It is possible to efficiently correct the upper and lower pincushion distortion while reducing the shape change of the beam spot during the operation of the sub deflection device.

  Further, according to the projection tube device of the present invention, since the projection tube deflection device of the present invention is provided, it is possible to provide a projection tube device with low power consumption and little variation in image quality.

  In the present invention, the tube axis of the projection tube apparatus provided with the main deflection device is the Z axis, the horizontal axis orthogonal to the Z axis is the X axis, and the vertical axis orthogonal to the X axis and the Z axis is the Y axis. Define an XYZ Cartesian coordinate system.

  In the first projection tube deflecting device of the present invention, in the XY plane including the X axis and the Y axis, the sub-horizontal coil is on or near a straight line passing through the Z axis and forming 30 ° with respect to the X axis. It is preferable that the deflection contributing portion parallel to the Z axis of the sub vertical coil is arranged on or near a straight line passing through the Z axis and forming 30 ° with respect to the Y axis. Further, in the second projection tube deflecting device of the present invention, in the XY plane including the X axis and the Y axis, the deflection contributing portion parallel to the Z axis of the sub-horizontal coil passes through the Z axis to the X axis. It is preferable that the sub-vertical coil is disposed on or near a straight line that forms 30 ° with respect to the Y axis. According to such a preferable configuration, the shape distortion of the beam spot during the operation of the sub-deflection device can be further reduced. In the present invention, “the vicinity of a straight line forming 30 °” preferably means within a range of 30 ° ± 7.5 °, more preferably within a range of 30 ° ± 5 °.

  In the first projection tube deflecting device of the present invention, the transition portion substantially parallel to the XY plane of the sub vertical coil protrudes in the Z-axis direction with respect to the ferrite core, and the transition portion and the Z of the sub vertical coil The deflection contribution portion parallel to the axis is preferably arranged on a common virtual cylindrical surface centering on the Z axis. According to such a preferable configuration, the inductance of the sub vertical coil can be reduced without reducing the number of turns of the sub vertical coil. Further, in the second projection tube deflecting device of the present invention, the transition portion substantially parallel to the XY plane of the sub horizontal coil protrudes in the Z-axis direction with respect to the ferrite core, and the transition portion and the sub horizontal coil The deflection contributing portion parallel to the Z axis is preferably disposed on a common virtual cylindrical surface centered on the Z axis. According to such a preferable configuration, the inductance of the sub horizontal coil can be reduced without reducing the number of turns of the sub horizontal coil. Therefore, the power consumption of the projection tube device can be further reduced by any configuration.

  In the first projection tube deflecting device of the present invention, a protrusion is formed on the inner peripheral surface of the ferrite core, and the inner diameter of the ferrite core at the top of the protrusion is smaller than the outer diameter of the sub vertical coil. Is preferably small. According to such a preferable configuration, the effective inner diameter of the sub horizontal coil can be reduced. In the second projection tube deflecting device of the present invention, a protrusion is formed on the inner peripheral surface of the ferrite core, and the inner diameter of the ferrite core at the top of the protrusion is outside the sub-horizontal coil. It is preferable that the diameter is smaller than the diameter. According to such a preferable configuration, the effective inner diameter of the sub vertical coil can be reduced. Accordingly, the deflection efficiency can be further improved by any configuration.

In the first projection tube deflecting device of the present invention, the sub-horizontal coil is disposed at a plurality of positions symmetrical with respect to the XZ plane including the X axis and the Z axis and the YZ plane including the Y axis and the Z axis. Preferably, the sub vertical coil includes a plurality of toroidal windings and a pair of saddle windings disposed on both sides with respect to the YZ plane. In this case, of the inner peripheral surface of the ferrite core, there are two pairs of deflection contributing portions parallel to the Z-axis of the portion where the plurality of toroidal windings are disposed and the pair of saddle windings. It is preferable that a protrusion is formed in a region excluding the arranged portion. Further, the inner diameter of the ferrite core in the sub-horizontal coil recess in which the toroidal winding is disposed is D _H1 , and the inner diameter of the ferrite core in the sub-vertical coil recess in which the deflection contributing portion is disposed is D _V1. It is preferable that D _H1 > D _V1 > D _P is satisfied, where D _P is the inner diameter of the ferrite core at the top of the protrusion. Furthermore, on one side with respect to the XZ plane, an angle formed by two straight lines passing through the Z axis and each of the Y-axis side ends of the pair of sub-horizontal coil recesses existing on both sides with respect to the YZ plane was a theta _S, when a unit of the inside diameter D _P and mm, and the unit of the angle theta _S °, preferably satisfies the _{2.6 <θ S / D P <} 3.35. According to such a preferable configuration, the deflection efficiency of the sub-horizontal coil is improved and the power consumption can be reduced.

Further, in the second projection tube deflecting device of the present invention, the sub-vertical coil is arranged at a plurality of symmetrical positions with respect to the XZ plane including the X axis and the Z axis and the YZ plane including the Y axis and the Z axis. Preferably, the sub-horizontal coil includes a pair of saddle-type windings disposed on both sides with respect to the XZ plane. In this case, of the inner peripheral surface of the ferrite core, there are two pairs of deflection contributing portions parallel to the Z-axis of the portion where the plurality of toroidal windings are disposed and the pair of saddle windings. It is preferable that a protrusion is formed in a region excluding the arranged portion. Further, the inner diameter of the ferrite core in the sub vertical coil recess in which the toroidal winding is disposed is D _V1 , and the inner diameter of the ferrite core in the sub horizontal coil recess in which the deflection contributing portion is disposed is D _H1. It is preferable that D _V1 > D _H1 > D _P is satisfied, where D _P is the inner diameter of the ferrite core at the top of the protrusion. Furthermore, on one side with respect to the YZ plane, an angle formed by two straight lines passing through the Z-axis and each of the X-axis side ends of the pair of sub vertical coil recesses existing on both sides with respect to the XZ plane was a theta _S, when a unit of the inside diameter D _P and mm, and the unit of the angle theta _S °, preferably satisfies the _{2.6 <θ S / D P <} 3.35. According to such a preferable configuration, the deflection efficiency of the sub vertical coil is improved, and the power consumption can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
First, an embodiment of the projection tube device of the present invention will be described with reference to FIG. As shown in FIG. 11, the projection tube device 51 of the present embodiment includes a glass panel 44 having a substantially rectangular screen display section 42, a funnel-shaped glass funnel 45 connected to the panel 44, and A vacuum envelope comprising a cylindrical glass neck 46 connected to the funnel 45 is provided. The deflection device 24 is mounted on the outer peripheral surface of the envelope from the neck portion 46 to the funnel 45. The funnel 45 has a small-diameter portion from the connecting portion with the neck portion 46 to the position where the deflection device 24 is mounted, a so-called yoke portion 47. An electron gun 49 that emits an electron beam 48 is disposed in the neck portion 46. The electron beam 48 is deflected horizontally and vertically by the horizontal and vertical deflection magnetic fields generated by the deflecting device 24, and the screen 50 is scanned horizontally and vertically, thereby displaying an image.

  FIG. 12 is a side view of the deflecting device 24 according to the embodiment of the present invention. The deflection device 24 includes a main deflection device 25 in which a main horizontal coil 26, a main vertical coil 27, and a main core 28 are arranged in this order from the tube axis toward the outside, and a sub-deflection provided on the neck side of the main deflection device 25. Device 29.

  FIG. 13 is a perspective view of the sub deflection device 29. The sub deflection device 29 includes a sub horizontal coil 30, a sub vertical coil 31, and a sub core 32. The winding of the sub horizontal coil 30 is wound around the sub core 32 in a toroidal shape, and the winding of the sub vertical coil 31 is wound in a saddle shape. Although the sub-vertical coil 31 is simplified and drawn in a thin plate shape in FIG. 13, it is actually a saddle type coil of about 20 turns.

The toroidal sub-horizontal coil 30 is wound at four locations symmetrically with respect to the XZ plane and the YZ plane. In the XY plane, the winding of the sub-horizontal coil 30 is defined by the angle formed by the X-axis and a straight line passing through the middle point of the existence region in the circumferential direction around the Z-axis of each sub-horizontal coil 30 and the Z-axis. The line angle θ _H is about 30 °.

A pair of saddle-type sub-vertical coils 31 are disposed on the Z-axis side of the sub-core 32, on both sides of the YZ plane, and symmetrically on the YZ plane. The sub-vertical coil 31 includes a pair of deflection contributing portions 33 in which the windings are arranged substantially parallel to the Z axis, and a transition in which the windings are parallel to the XY plane and arranged in an arc shape centered on the Z axis. Parts 34a and 34b. In the XY plane, the winding of the sub vertical coil 31 is defined by the angle formed by the Y axis and the straight line passing through the middle point of the existence region in the circumferential direction around the Z axis of the deflection contributing portion 33 and the Z axis. The angle θ _V is about 30 °.

  With such a configuration, the power consumption of the sub deflection device can be reduced. This will be described with reference to FIGS.

  In the present invention, since the sub-vertical coil 31 is of a saddle type, as shown in FIG. 13, a pair of deflection contributing portions 33 substantially parallel to the Z axis, a transition portion 34a on the panel side that does not contribute to deflection, and a neck side side. There is an opening 39 surrounded by the transition portion 34b where no winding exists.

FIG. 14 is a cross-sectional view of the sub-deflecting device 29 on a plane parallel to the XY plane. As shown in FIG. 14, the auxiliary horizontal coil 30 enters the opening 39. Further, a region of the inner peripheral surface of the sub-core 32 that does not face the deflection contributing portion 33 of the sub-vertical coil 31 and the sub-horizontal coil 30 protrudes toward the Z-axis, and the sub-core protrusion 40 is formed. This sub-core protrusion 40 also enters the opening 39. The inner diameter and outer diameter of the deflection contributing portion 33 of the sub vertical coil 31 are D _V0 and D _V1 , the inner diameter of the sub horizontal coil 30 is D _H0 , and the inner diameter of the sub core 32 at the top of the sub core protrusion 40 is D _P. Then, D _V0 , D _H0 and D _P are almost equal to each other. Therefore, D _P <D _V1 and D _H0 <D _V1 . Accordingly, the deflection contributing portion 33 of the sub vertical coil 31 and the sub horizontal coil 30 can be brought as close to the electron beam as possible, so that the deflection efficiency of the sub vertical coil 31 and the sub horizontal coil 30 can be improved. . Furthermore, since the sub-core 32 is made as close as possible to the electron beam by providing the sub-core protrusion 40 on the inner peripheral surface of the sub-core 32 in a range not interfering with the sub-vertical coil 31 and the sub-horizontal coil 30. The deflection efficiency of the sub vertical coil 31 and the sub horizontal coil 30 is further improved. In addition, since the sub vertical coil 31 is a saddle type and disposed on the Z axis side with respect to the sub core 32, the sub deflection magnetic field of the sub vertical coil 31 does not leak outside the sub core 32. As described above, the total power consumption of the sub deflection device 29 can be reduced.

  Next, according to the sub deflection device 29, the power consumption of the sub horizontal coil 30 can be reduced. This will be described below.

Of the inner peripheral surface of the sub-core 32, the inner diameter of the sub-core 32 in the sub-horizontal coil recess 60 in which the toroidal winding of the sub-horizontal coil 30 is arranged is D _H1 , and the deflection contributing portion 33 of the sub-vertical coil 31 is Assuming that the inner diameter of the sub-core 32 in the disposed sub-vertical coil recess 61 (which corresponds to the outer diameter D _V1 of the deflection contributing portion 33) is D _V1 , these and the above-described sub-core protrusions the inner diameter D _P of the sub-core 32 at the top of 40,
D _H1 > D _V1 > D _P
Satisfied. That is, the bottom surface of the sub vertical coil recess 61 and the top of the sub core protrusion 40 closer to the Y axis than the sub horizontal coil recess 60 are closer to the Z axis than the bottom surface of the sub horizontal coil recess 60. . For this reason, when viewed as a whole, the inner peripheral surface of the sub-core 32 approaches the electron beam at and near the Y-axis, so that the action of the sub-horizontal deflection magnetic field substantially along the Y-axis is enhanced. As a result, the deflection efficiency of the sub-horizontal coil 30 is improved, so that power consumption can be reduced.

Further, on one side with respect to the XZ plane, two straight lines L1 passing through the Y-axis side ends 60a of the pair of sub-horizontal coil concave portions 60 existing on both sides with respect to the YZ plane and the Z-axis. An angle θ _S formed by L2 is defined. Here, the angle θ _S is an angle formed by the two intersecting straight lines L1 and L2 in a region including the Y axis. ° the unit of angle theta _S, when a unit of the inside diameter D _P of the sub-core 32 at the top of the sub-core projections 40 was set to mm, and these,
2.6 <θ _S / D _P <3.35
Satisfied. When θ _S / D _P ≧ 3.35, that is, θ _S is relatively large, the power consumption of the sub horizontal coil 30 is reduced, but the region in which the sub horizontal coil 30 can be arranged in the circumferential direction centering on the Z axis. Therefore, it becomes difficult to make a desired number of turns of the winding of the sub horizontal coil 30. When θ _S / D _P ≦ 2.6, that is, θ _S is relatively small, the Y axis extends from the inner peripheral surface of the secondary core 32 into the space on the Z axis side in the circumferential direction around the Z axis. Since the region where the sub-horizontal deflection magnetic field is blown substantially along is narrowed, the effect of improving the effect of the sub-horizontal deflection magnetic field is weakened, and the effect of reducing power consumption is reduced. That is, when the ratio θ _S / D _P satisfies the above numerical range, the deflection efficiency of the sub-horizontal coil 30 is improved and the power consumption can be reduced.

Further, according to the sub-deflecting device 29, the change in the shape of the beam spot during operation can be reduced. The reason for this will be described below with reference to FIG. When a sub deflection current is passed through the sub vertical coil 31 whose winding angle θ _V with respect to the Y axis is set to about 30 °, a magnetic field is generated around the sub vertical coil 31. The magnetic field includes a magnetic field 35 a that passes through the space on the Z-axis side with respect to the sub-core 32 and a magnetic field 35 b that passes through the sub-core 32. The magnetic field 35 b passing through the inside of the sub core 32 is blown out toward the Z-axis side space of the sub core 32 at a position far from the sub vertical coil 31. The magnetic field 35 a generated in the vicinity of the sub vertical coil 31 and the magnetic field blown from the sub core 32 are combined to form a sub vertical deflection magnetic field 36 in the space on the Z axis side with respect to the sub core 32. The magnetic field 36 is substantially parallel to the X axis, and the intensity distribution in the Y axis direction is substantially uniform. Therefore, the Lorentz force applied to the electrons constituting the electron beam 37 by the magnetic field 36 is the same regardless of the position of the electrons in the XY cross section. Therefore, regardless of the operation of the sub vertical coil 31, the spot shape of the electron beam 37 is always substantially circular. Although the sub vertical coil 31 has been described above, since the winding angle θ _H with respect to the X axis is set to about 30 ° for the sub horizontal coil 30 as well, regardless of how the sub horizontal coil 30 operates. The spot shape of the electron beam 37 is always almost circular. Therefore, according to the sub-deflecting device 29, the shape of the beam spot hardly changes regardless of the degree of operation.

  Next, the relationship between the shape of the transition portions 34a and 34b of the sub vertical coil 31 and the power consumption in the projection television set will be described with reference to FIGS. As shown in FIG. 13, the transition portions 34 a and 34 b of the sub vertical coil 31 protrude in the Z-axis direction with respect to the end surface 32 a of the sub-core 32, and the transition portions 34 a and 34 b and the deflection contributing portion 33 have the Z axis. It is almost arranged on a common virtual cylindrical surface as a central axis. As an arrangement of the transition portions 34a and 34b, in addition to FIG. 13, the transition portions 34a and 34b can be bent away from the Z axis. In this case, the crossover portions 34 a and 34 b approach along the end surface 32 a of the sub-core 32. However, the arrangement shown in FIG. 13 is preferable because power consumption in the projection television set can be reduced. The reason is as follows.

When the crossover portions 34a and 34b are projected in the Z-axis direction with respect to the end surface 32a as shown in FIG. 13, the crossover portions 34a and 34b are compared with the case where the crossover portions 34a and 34b are bent along the end surface 32a. Can be moved away from the secondary core 32. Therefore, as shown in FIG. 15, the number of magnetic fluxes sucked into the sub-core 32 in the magnetic field 41 generated from the transition portions 34 a and 34 b decreases, and the number of magnetic fluxes linked to the sub-vertical coil 31 itself decreases. Therefore, the inductance value of the sub vertical coil 31 can be reduced. Since the number of turns of the sub-vertical coil 31 does not change even when the crossing portions 34a and 34b are projected in the Z-axis direction with respect to the end face 32a, the magnetomotive force for the electron beam does not change. The frequency of the sub-deflection current applied to the sub-deflection device 29 is as high as several hundred KHz, and the power consumption depends more on the inductance than the DC resistance of the coil. By arranging the crossing portions 34a and 34b as shown in FIG. 13 and FIG. 15, the inductance value can be reduced without changing the magnetomotive force for the electron beam, so that LI ² that is an index of power consumption of the television set is obtained. It can be made small efficiently.

  Although the shape seen along the Z-axis of the sub-core protrusion 40 formed on the inner peripheral surface of the sub-core 32 shown in the above embodiment is a square (trapezoid) shape, it is not limited to this, It may be hemispherical. Moreover, the sub core protrusion part 40 does not need to be formed. When the sub-core protrusion 40 is not formed, the effect of reducing power consumption is inferior to the case where the sub-core protrusion 40 is formed, but the sub-core 32 has a simple cylindrical shape. The cost of the core 32 can be reduced.

In the configuration of the above-described embodiment, the inventors set the winding angle θ _H of the toroidal-type sub-horizontal coil 30 and the winding angle θ _V of the saddle-type sub-vertical coil 31 to about 30 °, and the sub-core 32. minimum inner diameter D results diagonal size was 31mm the _P creates experimented with projection tube apparatus 7 inch, without influence on the beam spot shape little occurs, to be able to about 25% lower than the conventional power consumption confirmed. Furthermore, when the angle θ _S shown in FIG. 14 is 103 °, LI ² , which is a power consumption index for the sub-horizontal coil 30, can be reduced by 20.5% compared to the conventional case.

  In the above embodiment, the sub-horizontal coil 30 is a toroidal type and the sub-vertical coil 31 is a saddle type. However, according to the demand of the projection television set manufacturer, for example, the induction by the main horizontal magnetic field rather than the improvement of the deflection efficiency of the sub-vertical coil When priority is given to voltage reduction, the sub-horizontal coil may be a saddle type and the sub-vertical coil may be a toroidal type. Since the configuration and effects in this case can be easily understood by replacing the above description, a detailed description is omitted. In this case, the effect of improving the deflection efficiency of the sub vertical coil is reduced, but the induced voltage induced in the sub horizontal coil can be reduced.

  The field of use of the present invention is not particularly limited, but can be used, for example, in an image projection unit of a projection type projection television.

Schematic diagram showing the configuration of a conventional projection TV Side view of a deflection device used in a conventional projection television Front view of conventional sub deflection device (A) is a schematic diagram showing how a main horizontal magnetic field acts on a conventional sub-deflection device, and (B) is a voltage waveform diagram generated between terminals of a sub-horizontal coil by the main horizontal magnetic field. The figure which shows the magnetic field at the time of operation | movement of the conventional sub deflection | deviation apparatus. (A) is a front view of another conventional sub deflection device, and (B) is a side view thereof. Sectional view taken along line VII-VII in FIG. The graph which showed the result of having measured the Y-axis direction component By of the subhorizontal magnetic field which a saddle type subhorizontal coil generate | occur | produces along an X-axis Sectional drawing which showed the modification of the conventional sub deflection | deviation apparatus Schematic diagram showing the effect of barrel-type sub-horizontal magnetic field and sub-vertical magnetic field on beam spot shape in a conventional deflecting device The side view of the projection tube apparatus concerning one Embodiment of this invention The side view of the deflection | deviation apparatus concerning one Embodiment of this invention. The perspective view of the sub deflection | deviation apparatus concerning one Embodiment in the deflection | deviation apparatus of this invention. Sectional drawing of the sub deflection | deviation apparatus concerning one Embodiment in the deflection | deviation apparatus of this invention. The perspective view which showed the transition part of the sub vertical coil of the sub deflection | deviation apparatus concerning one Embodiment of this invention, and the magnetic field by this.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Red projection tube apparatus 2 Green projection tube apparatus 3 Blue projection tube apparatus 4 Deflection apparatus 5 Screen 6 Main deflection apparatus 7 Main vertical coil 8 Main core 9 Sub deflection apparatus 10 Sub core 11 Sub horizontal coil 12 Sub vertical coil 13 Leakage magnetic field from main horizontal coil 14 Leakage magnetic field from sub horizontal coil and sub vertical coil 15 Sub horizontal coil 16 Sub vertical coil 17 Sub core 18 Sub deflection magnetic field 19 of sub horizontal coil Sub deflection device 20 Sub deflection magnetic field of sub vertical coil 21 Magnetic type of sub-deflection magnetic field 22, 22 'Electron beam 22a Electron 22b closer to Y-axis 22b Electron 23, 23' far from Y-axis Deformed electron beam 24 Deflector 25 Main deflector 26 Main horizontal coil 27 Main vertical coil 28 Main core 29 Sub deflection device 30 Sub horizontal coil 31 Sub vertical coil 32 Sub core 33 Sub vertical coil deflection contribution parts 34a, 34b Crossing portion 35a, 35b Sub-deflection magnetic field 36 of sub-vertical coil Sub-deflection magnetic field 37 of sub-vertical coil Electron beam 39 Aperture 40 Sub-core projection 41 Magnetic field 42 generated from transition portion Screen display unit 43 Main horizontal coil 44 Panel 45 Funnel 46 Neck part 47 Yoke part 48 Electron beam 49 Electron gun 50 Screen 51 Projection tube device 60 Sub horizontal coil concave part 61 Sub vertical coil concave part

Claims (12)

A projection tube deflection device comprising a main deflection device for raster generation and a sub deflection device for convergence correction,
The sub deflection device includes a sub horizontal coil, a sub vertical coil, and a ferrite core,
The sub-horizontal coil is a toroidal coil, and the sub-vertical coil is a saddle-type coil.   The tube axis of the projection tube device provided with the main deflection device is the Z axis, the horizontal axis orthogonal to the Z axis is the X axis, and the X axis and the vertical axis orthogonal to the Z axis are the Y axis. When an XYZ orthogonal coordinate system is defined, in the XY plane including the X axis and the Y axis, the sub horizontal coil is disposed on or near a straight line passing through the Z axis and forming 30 ° with respect to the X axis. 2. The deflection device for a projection tube according to claim 1, wherein the deflection contributing portion parallel to the Z axis of the sub vertical coil is arranged on or near a straight line passing through the Z axis and forming 30 ° with respect to the Y axis.   The tube axis of the projection tube device provided with the main deflection device is the Z axis, the horizontal axis orthogonal to the Z axis is the X axis, and the X axis and the vertical axis orthogonal to the Z axis are the Y axis. When an XYZ orthogonal coordinate system is defined, a transition portion that is substantially parallel to the XY plane of the sub-vertical coil protrudes in the Z-axis direction with respect to the ferrite core, and is parallel to the transition portion and the Z-axis of the sub-vertical coil. 2. The deflecting device for a projection tube according to claim 1, wherein the deflection contributing portion is arranged on a common virtual cylindrical surface centering on the Z axis.   2. The projection tube deflecting device according to claim 1, wherein a protrusion is formed on an inner peripheral surface of the ferrite core, and an inner diameter of the ferrite core at a top of the protrusion is smaller than an outer diameter of the sub vertical coil. The tube axis of the projection tube device provided with the main deflection device is the Z axis, the horizontal axis orthogonal to the Z axis is the X axis, and the X axis and the vertical axis orthogonal to the Z axis are the Y axis. When XYZ Cartesian coordinate system is defined,
The sub-horizontal coil includes a plurality of toroidal windings arranged at a plurality of positions symmetrical with respect to an XZ plane including the X axis and the Z axis and a YZ plane including the Y axis and the Z axis,
The sub vertical coil includes a pair of saddle type windings disposed on both sides with respect to the YZ plane,
Of the inner peripheral surface of the ferrite core, a portion where the plurality of toroidal windings are arranged, and a portion of the pair of saddle type windings where two pairs of deflection contribution portions parallel to the Z axis are arranged Protrusions are formed in the area excluding
The inner diameter of the ferrite core in the concave portion for the sub horizontal coil in which the toroidal winding is disposed is D _H1 , and the inner diameter of the ferrite core in the concave portion for the sub vertical coil in which the deflection contributing portion is disposed is D _V1 , When the inner diameter of the ferrite core at the top of the protrusion is D _P ,
D _H1 > D _V1 > D _P
Satisfied,
On one side with respect to the XZ plane, an angle formed by two straight lines passing through the Z axis and each of the Y-axis side ends of the pair of sub-horizontal coil recesses existing on both sides with respect to the YZ plane is θ and _S, when a unit of the inside diameter D _P and mm, and the unit of the angle theta _S °,
2.6 <θ _S / D _P <3.35
The deflection device for a projection tube according to claim 1, wherein:   A projection tube device comprising the projection tube deflecting device according to claim 1. A projection tube deflection device comprising a main deflection device for raster generation and a sub deflection device for convergence correction,
The sub deflection device includes a sub horizontal coil, a sub vertical coil, and a ferrite core,
The sub-horizontal coil is a saddle type coil, and the sub-vertical coil is a toroidal type coil.   The tube axis of the projection tube device provided with the main deflection device is the Z axis, the horizontal axis orthogonal to the Z axis is the X axis, and the X axis and the vertical axis orthogonal to the Z axis are the Y axis. When the XYZ orthogonal coordinate system is defined, the deflection contributing portion parallel to the Z axis of the sub-horizontal coil passes through the Z axis and forms 30 ° with respect to the X axis in the XY plane including the X axis and the Y axis. 8. The deflecting device for a projection tube according to claim 7, wherein the sub-vertical coil is disposed on or near a straight line, and the sub vertical coil is disposed on or near a straight line passing through the Z axis and forming 30 [deg.] With respect to the Y axis.   The tube axis of the projection tube device provided with the main deflection device is the Z axis, the horizontal axis orthogonal to the Z axis is the X axis, and the X axis and the vertical axis orthogonal to the Z axis are the Y axis. When an XYZ orthogonal coordinate system is defined, a transition portion that is substantially parallel to the XY plane of the sub-horizontal coil protrudes in the Z-axis direction with respect to the ferrite core, and is parallel to the transition portion and the Z-axis of the sub-horizontal coil. 8. The deflection device for a projection tube according to claim 7, wherein the deflection contributing portion is disposed on a common virtual cylindrical surface centering on the Z axis.   8. The projection tube deflecting device according to claim 7, wherein a protrusion is formed on an inner peripheral surface of the ferrite core, and an inner diameter of the ferrite core at a top of the protrusion is smaller than an outer diameter of the sub horizontal coil. The tube axis of the projection tube device provided with the main deflection device is the Z axis, the horizontal axis orthogonal to the Z axis is the X axis, and the X axis and the vertical axis orthogonal to the Z axis are the Y axis. When XYZ Cartesian coordinate system is defined,
The sub-vertical coil includes a plurality of toroidal windings arranged at a plurality of positions symmetrical with respect to an XZ plane including the X axis and the Z axis and a YZ plane including the Y axis and the Z axis,
The sub-horizontal coil includes a pair of saddle type windings disposed on both sides with respect to the XZ plane,
Of the inner peripheral surface of the ferrite core, a portion where the plurality of toroidal windings are arranged, and a portion of the pair of saddle type windings where two pairs of deflection contribution portions parallel to the Z axis are arranged Protrusions are formed in the area excluding
The inner diameter of the ferrite core in the sub vertical coil recess in which the toroidal winding is disposed is D _V1 , and the inner diameter of the ferrite core in the sub horizontal coil recess in which the deflection contributing portion is disposed is D _H1 , When the inner diameter of the ferrite core at the top of the protrusion is D _P ,
D _V1 > D _H1 > D _P
Satisfied,
On one side with respect to the YZ plane, an angle formed by two straight lines passing through the Z axis and each of the X-axis side ends of the pair of sub vertical coil recesses existing on both sides with respect to the XZ plane is θ and _S, when a unit of the inside diameter D _P and mm, and the unit of the angle theta _S °,
2.6 <θ _S / D _P <3.35
The deflection device for a projection tube according to claim 7, wherein:   A projection tube device comprising the projection tube deflection device according to claim 7.

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