JP2667227B2 - Flat picture tube device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat picture tube device comprising a flat picture tube and a deflection yoke mounted on a funnel portion of the picture tube.

2. Description of the Related Art A conventional flat picture tube apparatus is configured as shown in FIGS. 4 and 5, and an electron beam emitted from an electron gun 3 provided in a neck portion 2 of the flat picture tube 1. 4 is
The phosphor screen 7 is scanned by the deflection action of the deflection yoke 6 mounted on the funnel unit 5. The rear panel section 8 supporting the phosphor screen 7 is in a plane inclined with respect to the gun axis 9 of the electron gun 1, and the image drawn on the phosphor screen 7 by the scanning passes through the transparent front panel section 10. Since the image is viewed from the scanning surface side through, a high-luminance image can be obtained. The deflection yoke 6 includes a pair of toroidal type vertical deflection coils 11a and 11b, and a ferrite core 1
2. It has a pair of saddle type horizontal deflection coils 13a, 13b and an insulating coil supporting frame (not shown). The pair of horizontal deflection coils 13a, 13b are shown in FIG. 6 and FIG. As shown, they are formed vertically symmetrically.

Problems to be Solved by the Invention In the flat type picture tube device configured as described above,
While the neck 2 is cylindrical, the rear panel 8
Since the front panel 10 and the front panel 10 are both almost flat, the deflection yoke 6, particularly the horizontal deflection coil 12, which is mounted so as to surround the funnel 5 connecting the two, is connected to the picture tube 1 on the phosphor screen 7 side. Not completely along the outer surface of
In particular, in the case of a vertical inclination or a phosphor screen, a barrel-type distortion is easily generated at the upper part of the raster and a pincushion-type distortion is easily generated at the lower part of the raster. Further, in addition to the difficulty in obtaining a high deflection efficiency, there is a problem that the margin of the so-called neck shadow, in which the electron beam 4 is caught on the neck portion 2 and the funnel portion 5, is low.

Means for Solving the Problems The flat-type picture tube device of the present invention includes a flat-type picture tube in which a phosphor screen is provided on a rear panel portion inclined with respect to the gun axis of an electron gun, and at least the above-mentioned picture tube. A rear panel portion side has a funnel portion having a rectangular cross section and a deflection yoke mounted along an outer peripheral surface of a neck portion having a circular cross section, and the deflection yoke is arranged on the rear panel with respect to the gun shaft. And a pair of horizontal deflection coils on the side of the rear panel and a pair of horizontal deflection coils on the side of the rear panel. The horizontal deflection coil on the side opposite to the rear panel is larger than the coil.

In the flat type picture tube device configured as described above,
Since the inner surface of the horizontal deflection coil is better aligned with the outer surface of the picture tube, particularly at the funnel portion, even if the funnel portion has a substantially pyramid shape on the large diameter side, tilting of the deflection yoke can be prevented. Further, the coil winding angle of the pair of horizontal deflection coils in the direction along the outer peripheral surface of the rectangular funnel portion is set to be greater for the horizontal deflection coil on the side opposite to the rear panel than on the rear panel. , The barrel-type distortion at the upper part of the raster and the pincushion-type distortion at the lower part of the raster, which occur in the phosphor screen of the flat picture tube, can be prevented. Furthermore, since the effective coil inner diameter becomes smaller,
The deflection efficiency can be increased, and the mounting position of the deflection yoke can be further shifted to the phosphor screen side, so that the margin of the neck shadow can be increased.

Next, the present invention will be described with reference to embodiments shown in the drawings.

As shown in FIGS. 1 and 2, a pair of saddle type horizontal deflection coils 14a and 14b mounted on the funnel portion of the flat picture tube 1 are a pair of toroidal type vertical deflection coils (not shown). , The ferrite core, the insulating coil support frame and the like constitute a deflection yoke, which is formed vertically asymmetrically with respect to the horizontal plane 15 including the gun shaft 9. That is, the cross-sectional shapes at the position a on the phosphor screen side in the region along the gun axis, the position c on the electron gun side, and the intermediate position b are shown by a, c, b in FIG.
, Respectively.

The cross-sectional shape of the coil at the position c on the electron gun side has an inner surface along an arc having a radius of curvature centered on the gun axis 9 and an eccentric outer surface in the form of a horizontal plane similarly to the conventional horizontal deflection coil.
It is symmetrical with reference to 15. On the other hand, the cross-sectional shape of the coil at the phosphor screen side position a is substantially along a horizontally long rectangle rounded at a corner portion,
Almost along the outer surface of the funnel. However, as shown in FIGS. 2 and 3, the coil winding angles of the pair of horizontal deflection coils 14a and 14b in the direction along the outer peripheral surface of the funnel portion,
That is, the angle between the horizontal axis 15 and the ends of the winding regions of the horizontal deflection coils 14a and 14b away from the horizontal axis 15 is determined by the horizontal deflection coil 14a on the rear panel section 8 side and the front panel section 1
The 0-side horizontal deflection coil 14b is larger. Also,
The cross-sectional shape of the coil at the intermediate position b is intermediate between the cross-sectional shapes at the positions a and c. Such a deformation tendency is not limited to the position b and moves from the vicinity of the position c to the position a. It is configured to occur gradually.

In the picture tube device of the present invention, since the inner surface of the horizontal deflection coil is substantially completely along the outer surface of the funnel portion of the flat type picture tube,
The inclination of the deflection yoke can be prevented, and the coil winding angle of the pair of horizontal deflection coils in the direction along the outer peripheral surface of the rectangular funnel portion is determined by the horizontal deflection col on the rear panel side. Since the horizontal deflection coil on the side is larger, it is possible to prevent barrel-type distortion at the upper part of the raster and pincushion-type distortion at the lower part of the raster, which occur in the phosphor screen of the flat picture tube. Thus, the effective coil inner diameter can be reduced, and the deflection efficiency can be improved. Further, since the mounting position of the deflection yoke can be further shifted to the phosphor screen side, the margin of the neck shadow can be increased.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a flat picture tube apparatus embodying the present invention, FIG. 2 is a front view of a pair of horizontal deflection coils of the flat picture tube apparatus, and FIGS. 3 (a), (b) and 3 (b). (C) is a diagram showing the cross-sectional shape of the horizontal deflection coil at three places in FIG. 2, FIG. 4 is a side cross-sectional view of a conventional flat picture tube device, FIG. 5 is a perspective view of the device, and FIG. The figure is a perspective view of a pair of horizontal deflection coils of the device,
FIG. 7 is a side view of the deflection coil. DESCRIPTION OF SYMBOLS 1 ... Flat type picture tube, 3 ... Electron gun, 5 ... Funnel part, 7 ... Phosphor screen, 9 ... Gun shaft, 14a, 14b ...
... horizontal deflection coil, 15 ... horizontal plane.

Claims (1)

(57) [Claims] 1. A flat picture tube having a phosphor screen provided on a rear panel portion inclined with respect to a gun axis of an electron gun;
At least the funnel portion having a rectangular cross-section at the rear panel portion side of the picture tube and a deflection yoke mounted along an outer peripheral surface of a neck portion having a circular cross-section are provided on the picture tube. A pair of horizontal deflection coils are provided on the rear panel portion side and the opposite side with respect to an axis, and the coil winding angle of the pair of horizontal coils in a direction along the outer peripheral surface of the rectangular funnel portion is defined as A flat picture tube device wherein the horizontal deflection coil on the side opposite to the rear panel is made larger than the horizontal deflection coil on the rear panel.