Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Reexamination Certificate
2001-03-02
2002-10-15
Wong, Don (Department: 2821)
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
C315S001000, C335S213000
Reexamination Certificate
active
06465943
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a winding apparatus and a winding method of deflection coil such as a horizontal deflection coil and a vertical deflection coil utilized for a deflection yoke, and further relates to a deflection yoke manufactured by the winding apparatus and the winding method thereby.
2. Description of the Related Art
In a picture displaying apparatus utilizing a color picture tube of an inline three electron gun type, there existed one method, which utilizes a deflection yoke of a self-convergence system, out of several methods for converging three electron beams emitted from three electron guns on a screen or a picture excellently. Such a deflection yoke of self-convergence system is usually composed of a pair of upper and lower saddle shaped horizontal deflection coils and a pair of right and left saddle shaped vertical deflection coils, and then an excellent convergence characteristic can be obtained.
However, when a raster distortion appearing in upper and lower areas on a screen is adequately compensated in a color picture tube of an inline three electron gun type, a miss-convergence pattern shown in
FIG. 1
is generated. In
FIG. 1
, a solid line represents a horizontal bright line of red (R) color, a broken line represents a horizontal bright line of blue (B) color, and an arrow “X” exhibits the horizontal direction of a screen. In other words, in an edge area of the screen in the vertical direction, the “R” is shifted upward more than the “B” in the first and third quadrants. In the second and fourth quadrants, the “R” is shifted downward more than the “B”. Further, in a middle area of the screen in the vertical direction, The “R” is shifted downward more than the “B” in the first and third quadrants, and the “R” is shifted upward more than the “B” in the second and fourth quadrants. A pattern in the edge area is referred to reverse cross and a pattern in the middle area is referred to normal cross. Miss-convergence such that a cross pattern is reversed in the respective edge and middle areas is usually called reversal trilemma.
With respect to means for improving the trilemma, as disclosed in the Japanese Patent No. 2967683, for example, a method of combining a vertical deflection coil provided with a center tap with a diode switching circuit and other methods such that a saturable reactor connected to a horizontal deflection coil is combined with a diode switching circuit are realized.
Further, a convergence characteristic and a deflection distortion characteristic in a deflection yoke are extremely affected by locations and distributions of wires in a horizontal deflection coil and a vertical deflection coil (hereinafter referred as a deflection coil generically). Accordingly, a deflection coil of a deflection yoke, which is mass-produced commonly, obtains required characteristics by dividing a coil into a plurality of sections with controlling wire locations by a so called dividing pin and adjusting a location of each section and a number of windings when the wire is wound so as to form the coil.
A severer requirement is imposed on convergence and deflection distortion characteristics of a deflection yoke as a displaying apparatus has been in higher definition recently. In order to improve fundamental performances and flexibility of designing in response to the requirement, obtaining a more accurate characteristic is required by increasing a number of sections to be divided so as for a wire or coil allocation and wire distribution or winding distribution to be assigned minutely.
With reviewing a current method of improving the reversal trilemma first, a circuit for compensating the reversal trilemma and component parts such as a saturable reactor must be added by the current improving method. Accordingly, there existed some problems such that manufacturing cost will increase and manpower for assembling a deflection yoke will increase.
With examining a requirement for increasing dividing sections in a deflection coil next, a gap between dividing sections must be narrowed so as to increase a number of dividing sections of a deflection coil. In order to narrow the gap between dividing sections, a distance between dividing pins must be shortened. A dividing pin is controlled its putting in and out to a winding allocation by a pin driving device provided on a coil form of a winding apparatus. Accordingly, distances between the pin driving devices must be shortened so as to shorten the distance between the dividing pins. As far as adjacent pin driving devices interfere with each other, the distance between pin driving devices can not be shortened any more, as a matter of course, so that it is limited to shorten the distance between dividing pins. In other words, a distance between two dividing pins and a number of dividing pins are physically limited by a dimension of pin driving device being mounted on a coil form.
Therefore, a current winding apparatus and winding method of utilizing the winding apparatus sometimes can not realize a necessary number of dividing pins and their allocations and fails to improve performance of a deflection coil. Accordingly, there existed a problem such that a deflection yoke satisfying a severe requirement for the convergence characteristic and the deflection distortion characteristic can not be obtained.
SUMMARY OF THE INVENTION
Accordingly, in consideration of the above-mentioned problems of the prior art, an object of the present invention is to provide a winding apparatus and a winding method of a deflection coil such as a horizontal deflection coil and to provide a deflection yoke, which can improve the reversal trilemma without utilizing a circuit or a component part for compensating the reversal trilemma. Another object of the present invention is to provide a winding apparatus and a winding method of a deflection coil and a deflection yoke, which can improve flexibility of designing winding distribution of a deflection coil, and further can improve the convergence and deflection distortion characteristics.
In order to achieve the above object, the present invention provides, according to an aspect thereof, a winding apparatus having a convex form and a concave form for forming a horizontal deflection coil utilized for a deflection yoke being mounted on a neck portion of a color picture tube, wherein the horizontal deflection coil is formed by winding a wire in a winding space between the convex form and the concave form so that the neck portion corresponds to a smaller diameter section a screen side of the color picture tube corresponds to a larger diameter section, and an area connecting the smaller diameter section and the larger diameter section corresponds to a side section the winding apparatus includes: a plurality of dividing pins of regulating winding distribution in the side section being inserted in the winding space while winding the wire the plurality of dividing pins further includes: a first dividing pin provided within a range of 20 to 35% of a length between the larger diameter section and the smaller diameter section in a direction from the larger diameter section to the smaller diameter section and within an angle of 10 to 25 degrees to a horizontal axis of the screen and a line connecting the first dividing pin and an axial line of the color picture tube viewing from a cross section at a position of inserting the first dividing pin in the winding space; and a second dividing pin provided within a range of 55 to 70% of a length between the larger diameter section and the smaller diameter section in a direction from the larger diameter section to the smaller diameter section and within an angle of 25 to 40 degrees to the horizontal axis of the screen and a line connecting the second dividing pin and the axial line of the color picture tube viewing from a cross section at a position of inserting the second dividing pin in the winding space.
According to another aspect of the present invention, a winding method of deflection coil is provided.
Asayama Manabu
Nozawa Takahiro
Connolly Bove & Lodge & Hutz LLP
Dinh Trinh Vo
Victor Company of Japan Ltd.
Wong Don
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