JPH04112435A - Deflection yoke device - Google Patents

Abstract

PURPOSE:To provide a deflection yoke device capable of correcting mislanding of a color cathode-ray tube by furnishing an aux. vertical coil at the rear of a deflection yoke, and thereby generating uniform bipolar magnetic field in horizontal direction in synchronization with the horizontally deflecting magnetic field. CONSTITUTION:Series connection is made to horizontally deflecting coils 10a, 10b wherein the connection polarity is such that the magnetic fields 16, 17 generated from aux. vertical coils 14, 15 are directed horizontally in the same direction and same intensity at all times so as to provide a bipolar magnetic field which is inverted in synchronization with horizontally deflecting magnetic fields 13a, 13b. These magnetic fields 16, 17 for correction of landing produced by the aux. vertical coils 14, 15 invert their directions up and down according to the deflection left and right of the electron beam. As a result, a vertical mislanding generated on the left and right of a screen is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a deflection yoke device for an in-line color cathode ray tube.

[Conventional technology]

FIG. 3 is a side sectional view showing the schematic structure of a color cathode ray tube. (1) is a color cathode ray tube, and (4) is a funnel having a phosphor film (2) on the inner surface of the panel (3). It is connected to the panel (3) and is approximately cone-shaped. (5
) is the neck made of a glass cylinder, and the funnel (4)
It is connected to the. (6) is an in-line electron gun that generates a plurality of electron beams, and is housed within the neck portion (5). (7) is a base for supplying driving voltage to each electrode; (8) is a deflection yoke that deflects the electron beam emitted from the electron gun (6); (9) is a shadow mask; This is to selectively irradiate the electron beam deflected by the phosphors (2) of three colors of red, green, and blue formed on the inner surface of the panel (3).

FIG. 4 is a perspective view of the deflection yoke (8), showing the horizontal deflection coil flOal, (IOb) and the vertical deflection coil (I
1a) (llb).

In Fig. 3, in order to project an image on the face of the panel (3), the electron beam emitted from the electron gun 5) is passed through one of the many holes in the shadow mask (9).
An appropriate deflection magnetic field is applied from the deflection yoke (8) so as to properly hit the appropriate phosphor (2) on the inner surface of the panel.

This deflection magnetic field is generated by the horizontal deflection coil (10a), fl
A sawtooth horizontal deflection current as shown in Fig. 7 is applied to the vertical deflection coil (IIallilb).
The vertical deflection magnetic fields (12a) and (12b) are magnetic fields in which the polarity in the horizontal direction is reversed, as shown in Fig. 5. (13a) and (13b) are magnetic fields whose polarity is reversed in the vertical direction.

In this case, the deflection magnetic field generated from the deflection yoke (8) is
The electron beam passing through the hole in the shadow mask (9) is affected by the external environment and an appropriate deflection magnetic field is not applied.
Occasionally, a suitable phosphor (2) is not irradiated, and this deviation in the point at which the electron beam reaches a certain phosphor is called landing deviation.

Figure 6 is a diagram showing an example of the directional pattern of this landing shift. When raster scanning an electron beam with a color cathode ray tube, on the left side of the screen, the electron beam is oriented upwardly relative to a predetermined phosphor. On the right side of the screen, it is shifted downwards.

As mentioned above, the deviation in the arrival point of the electron beam to the phosphor, which is reversed on the left and right sides of the screen, is not only caused by the environment in which the color cathode ray tube is operated, but also due to the assembly accuracy of the deflection yoke and the assembly of the color cathode ray tube itself. It also depends on accuracy etc.

[Problems to be Solved by the Invention] In the conventional deflection yoke device, there was a problem in that a landing shift occurred in opposite directions on the left and right sides of the raster screen, resulting in loss of monochromatic linearity and color purity tolerance. .

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a deflection yoke device that can correct mislanding of a color cathode ray tube.

[Means for Solving the Problems] A deflection yoke device according to the present invention is provided at the rear of a deflection yoke, and is configured to generate a horizontally uniform two-dimensional magnetic field in synchronization with a horizontal deflection magnetic field.
It is equipped with an auxiliary vertical coil that generates a polar magnetic field.

[Effect]

In this invention, the auxiliary vertical coil attached to the rear of the deflection yoke generates a horizontal two-pole magnetic field that corrects mislanding in synchronization with the horizontal deflection magnetic field, so that it can be oriented downward from one side to the left and right of the screen. Misland ink that occurs can be effectively corrected.

[Example] Hereinafter, an embodiment of this invention will be described.

Figure 1 is a view of the deflection yoke device ffi[8] of this embodiment seen from the rear of the neck (5), with the auxiliary vertical coils (141, [151) sandwiched between the neck (5) and the horizontal It is characterized by being arranged in the direction.

In addition, Fig. 2 shows the auxiliary vertical coil +141 of this embodiment.
, (with connection circuit M of 151, auxiliary vertical coil (14)
(15) is the horizontal deflection coil fl[la), flO
b) are connected in series with each other, and the connection polarity is determined by the magnetic field (
+61, (+71 is always the same direction and same amount of horizontal magnetic field, horizontal deflection magnetic field f13a), (13
It is a two-pole (N pole, S pole) magnetic field that reverses in synchronization with b). In order to operate a color cathode ray tube in raster scanning, horizontal deflection coils (loa) and f are required as shown in Figure 7.
It is necessary to apply a sawtooth wave current to the electron beam (lob) to deflect the electron beam left and right.

In this case, assuming that the electron beam is deflected to the left side of the raster when the deflection current corresponds to point (1B), the auxiliary vertical coil f141. The landing correction magnetic field generated by the current flowing in (15) is indicated by the arrow (16) in Figure 1.
The winding direction of the auxiliary vertical coils (14) and (15) and the polarity of the correction current are determined so that the direction is as follows.

Also, when the horizontal deflection current in Figure 7 corresponds to point (I9), the positive and negative polarities are reversed from point (1B), so the electron beam is deflected to the right side of the raster, and in this case The direction of the correction magnetic field created by the auxiliary vertical coils (+41. +15) is the direction of the arrow (17) in FIG.

As shown in F, the landing correction magnetic field (+61. +17
1, the vertical direction is reversed according to the left and right deflection of the electron beam.

In other words, the electron beam is deflected by the horizontal deflection coil (l　Oal　).

+10b), the electron beam is deflected downward by the complementary magnetic field (I6) generated by the auxiliary vertical coil [141, (15).

Conversely, when the electron beam is deflected to the right side of the screen, the electron beam is deflected upward by the correction magnetic field (17) generated by the auxiliary vertical coils (14) and (151).
Vertical landing deviations occurring on the left and right sides of the screen as shown in FIG. 6 are corrected.

In addition, in the above embodiment, the auxiliary vertical coils (14) (15
Although the specifications, shape, etc. of ) are not described in detail, this can be done by determining the number of turns of the coil, the shape of the coil, the amount of LF current, and its waveform in accordance with the amount of correction for landing deviation.

In addition, the auxiliary vertical coils f+4] and +151 are driven by the horizontal deflection coils (IOa) and [l0b shown in FIG.
) is not limited to the configuration in which it is connected in series with the horizontal deflection coils (10al, (10bl)), but any configuration may be used as long as it is configured to generate a bipolar magnetic field in synchronization with the horizontal deflection coils (10al and 10bl).

If the landing pattern is reversed in direction from the example shown in FIG. 6, the direction of the correction magnetic field f15), (17) generated by the auxiliary hand coil may be changed.

〔Effect of the invention〕

As described above, according to the present invention, the deflection yoke device is equipped with an auxiliary vertical coil that generates a landing correction magnetic field in accordance with the period of horizontal deflection of a color cathode ray tube.
Mislanding can be effectively corrected, and there is an effect that color purity and color purity margin are not impaired.

[Brief explanation of the drawing]

Fig. 1 is a view from the rear of the deflection yoke device showing the arrangement of the auxiliary vertical coil according to the present invention, Fig. 2 is a connection circuit diagram of the auxiliary vertical coil of this embodiment, and Fig. 3 is a diagram of the color cathode ray tube. Fig. 4 is a perspective view of the deflection yoke; Fig. 5 is a diagram showing the horizontal deflection magnetic field of the deflection yoke and the direction of the vertical deflection magnetic field; Fig. 6 is a diagram showing the direction of the electron beam to the phosphor. FIG. 7 is a waveform diagram of the horizontal deflection current. +81-...Deflection yoke device, (10a)ilOb)
・,,Horizontal deflection coil, (+38+, (+3bl-・Horizontal deflection magnetic field, (14+. (15+-・・-auxiliary vertical fill, +161. +171
...Landing aid created by the auxiliary coil.
magnetic field. Note that the same reference numerals in the figures indicate the same or corresponding parts. Figure 1

Claims (1)

[Claims] (1) A deflection yoke device used in in-line color cathode ray tubes, which is attached to the rear of the deflection yoke and is an auxiliary device that generates a horizontally uniform bipolar magnetic field whose polarity is reversed in synchronization with the horizontal deflection magnetic field. A deflection yoke device characterized by being equipped with a vertical coil.