JPH04253140A - Color selecting device - Google Patents

Abstract

PURPOSE:To prevent an electron beam from being shielded by the crossing of a damp wire and a beam scanning line to generate a nonluminous portion on a fluorescent surface in a slit mask type color selecting device. CONSTITUTION:A damp wire 13 is stretched to be inclined by theta against the X-axis and kept in parallel with a beam scanning line 12, where theta is expressed by the equation theta=tan<-1>(V.fV)/(H.fH). The damp wire 13 is made parallel with the beam scanning line without crossing it, thus an electron beam is not shielded by the damp wire 13.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color sorting device, and more particularly to a color sorting device comprising a slit mask structure and a dump wire.

0002

[Prior Art] In a color television picture tube,
Opposed to the color phosphor screen, a color selection device such as a shadow mask or a slit mask is disposed so that an electron beam corresponding to each color lands on the phosphor of a predetermined color on the color phosphor screen.

The slit mask structure used as this color sorting device is constructed by extending a large number of metal strips around a frame in one direction. In this case, the metal strip may vibrate or
If the positions are shifted from each other, correct color sorting cannot be performed, so conventionally, as shown in FIG. Vibration and mutual displacement of these metal strips were suppressed by contacting or fixing them. In the figure, 20 is a frame and 22 is a scanning line.

0004

[Problems to be Solved by the Invention] On the other hand, the scanning lines of a color television picture tube are usually arranged along an axis perpendicular to the metal strip (
It has a certain specific angle θ with respect to the X-axis (hereinafter referred to as the “X-axis”). The following explanation will be given with reference to FIG. With conventional color sorting equipment,
Since the dump wire 23 is stretched parallel to the X axis, there is an angle difference of θ between the dump wire 23 and the scanning line 22. Due to this angular difference, the dump wire 23 and the scanning line 22 are connected to a certain point A.
Since the electron beam intersects at point A and is blocked by the dump wire 23, the phosphor screen extending from point A will not emit light. There was a problem in that some parts were missing.

An object of the present invention is to provide a color sorting device that prevents the electron beam from being blocked.

[0006]

[Means for Solving the Problems] In order to achieve the above object, in the color sorting device according to the present invention, a large number of metal strips are arranged to face the fluorescent screen of a color television picture tube. A frame that stretches your body,
A dump wire is stretched across the metal strip and has a specific angle between the dump wire and an axis perpendicular to the metal strip.

[0007]

As shown in FIG. 1, the color sorting device of the present invention prevents the electron beam from being blocked by stretching the dump wire 13 parallel to the scanning line 12.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a front view showing one embodiment of the present invention. In the figure, a metal strip 11 extends along the frame 10 in one direction.
Build a large number of books. Since the electron beam normally starts scanning from the upper left to the lower right, the scanning line 12 is inclined clockwise by θ with respect to the axis (X axis) orthogonal to the metal strip 11. θ is determined by the horizontal deflection frequency fH, the vertical deflection frequency fV, the horizontal deflection section H, and the vertical deflection section V, and is obtained by the following equation.

[0009] θ=tan-1 {(V・fV)/(H・f
H)}

Therefore, by stretching the dump wire 13 at an angle of θ clockwise with respect to the X axis, the dump wire 13 can be made parallel to the scanning line, and the dump wire 13 and the scanning line can intersect. This has the effect of preventing the electron beam from being blocked.

As a specific example, a 17-inch vertical color picture tube is shown below. Horizontal deflection section H is 264mm,
The vertical deflection section V is 352 mm, and the horizontal deflection frequency f
H is 15.75kHz, vertical deflection frequency fV is 60Hz
Then, the dump wire 13 is θ=tan-1{(35
2×60)/(264×15.75×103)}=0.
The above effect can be obtained by stretching the structure with a 3 degree clockwise inclination.

0012

As explained above, the present invention prevents the electron beam from being blocked by the dump wire crossing the scanning line by stretching the dump wire at an angle parallel to the beam scanning line. It has a preventive effect.

[Brief explanation of the drawing]

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

FIG. 2 is a front view showing a conventional color sorting device.

[Explanation of symbols]

10, 20 frames 11, 21 Metal strip 12, 22 scanning line 13, 23 Dump wire

Claims (1)

[Claims] 1. In a color sorting device disposed facing the phosphor screen of a color television picture tube, a frame consisting of a large number of metal strips is provided with a dump wire extending over the metal strips. A color sorting device characterized in that the metal strip is stretched and has a specific angle between the axis perpendicular to the metal strip and the dump wire.