JPS6276140A - Deflector - Google Patents

Abstract

PURPOSE:To produce a low-cost deflector without reducing the sensitivity of vertical deflection by using four front magnetic pieces and two back magnetic pieces as members for correcting the front distribution of a vertically deflecting magnetic field into a pin-cushion from and the back distribution into a barrel form and locating these members between the vertically deflecting coil and the horizontally deflecting coil. CONSTITUTION:Front correction members consist of four magnetic pieces 5c-5f. The front magnetic pieces 5c-5f and back magnetic pieces 56a and 6b are affixed to given positions on the outer surface of a separator 3. The magnetic pieces 5c-5f produce a front vertically deflecting magnetic field 10F with a pin-cushion form. A vertically deflecting magnetic field 10 consists of the front region with a pin-cushion form and a back region with a sharp barrel form. It is distributed in a barrel form as a whole. Due to the above structure, the self convergence of this deflector and its pin-cushion distortions on the right and the left of the raster are alleviated. Furthermore, the cost of the magnetic pieces 5c-5f is low because they are small and have a simple shape. Besides, the magnetic pieces 5c-5f minimally reduce the deflection efficiency of a vertically deflecting coil 2.

Description

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

[Prior Art] As conventional devices of this type, there is a deflection device equipped with a so-called "cross arm" described in Japanese Patent Publication No. 57-85542, and "Toshiba Review" Vol. 37, Vol. 8, which is a development of this deflection device.
There is a deflection device described in No. (1981), page 219.

FIG. 5(a) is a side view of the deflection device shown in the latter FIG. 10, and FIG. 5(b) is a front view of the deflection device as seen from the funnel side c (hereinafter referred to as the front side), (1) is a ferrite core, (
2) It Cocoa 1) has a vertical deflection coil wound in a toroidal shape, (3) is a separator, and (4) a horizontal deflection coil wound in a hollow shape and placed inside the separator (3) for strong Generates a pincushion-shaped magnetic field. (5a) and (5b) are cross arms made of a member with high-speed magnetic flux such as a silicon steel plate, and each has two magnetic pieces (5c) and (
5d), (5e), (5f), and a vertical deflection coil (
2) to collect the leakage magnetic flux, and emit the magnetic flux from the four magnetic pieces (5C) to (6f) as shown in Figure 6 (
The front vertical deflection magnetic field synthesized as shown in a) (
IOF) has a pincushion shape.

In addition, (6a) and (6b) are two magnetic pieces made of silicon steel plate, etc., and are attached to the surface of the separator (3) between the vertical area coil (2) and the horizontal deflection coil (4), and the center They are arranged at centrally symmetrical positions on the vertical axis passing through the axis (9), and form the rear vertical deflection magnetic field (IOR) into a strong barrel shape, as shown in Figure 6 (bl), and the overall As shown in Figure 7, the distribution of the vertical deflection coils is strongly curved at the rear;
The front side is shaped like a pincushion, and the whole is made of firefly-shaped gin cloth to realize self-convergence and correct pincushion distortion on the top and bottom and left and right sides of the screen.

[Problem that the invention seeks to solve]

However, the above conventional front cross arm (5a).

(5b) is expensive because it needs to be formed into a large and complicated shape in order to collect the leakage magnetic flux between the vertical deflection coils (2). Since there is a magnetic material that does not contribute to the vertical deflection, there is a problem that the inductance of the vertical deflection coil increases and the vertical deflection sensitivity decreases.

This invention was made to solve these problems, and it does not reduce vertical deflection sensitivity, and
The purpose is to obtain an inexpensive deflection device.

[Means for Solving the Problems] According to the present invention, a center Two magnetic pieces are arranged in axially symmetrical vertical positions, and four magnetic pieces are also arranged in an axially symmetrical diagonal north direction on the front side. The two magnetic pieces make the rear magnetic field of the vertical deflection magnetic field into a barrel shape, and the four front magnetic pieces make the front magnetic field distribution of the vertical deflection magnetic field into a pincushion shape, and the overall shape is barrel-shaped. It is configured to form a magnetic field distribution.

[Effect]

The four magnetic pieces that correct the front vertical deflection magnetic field are small and have a simple shape, so they are inexpensive, and since they hardly increase the inductance of the vertical deflection coil, they do not reduce the vertical deflection sensitivity.

[Embodiment of the invention] Figure 1 (at is a side view of an embodiment of the invention,
1 is a plan view thereof, with the vertical deflection coil and ferrite core removed. In the figure, the same reference numerals indicate the same or corresponding components as those in the conventional example shown in FIG. , (5f) are formed into grooves, and each is pasted at a predetermined position on the outer surface of the separator (3) together with the rear magnetic pieces (6a) and (6b).

FIG. 1 (cl is a view seen from line C-C in FIG. 1(a), showing the placement positions of magnetic pieces (5c) to (5f). The center position of 5f) is 30° to 70° measured from the horizontal axis X passing through the central axis (9)
It is made of a silicon steel plate with a thickness of 0.3 to 0.8 fl, or a magnetic material such as permalloy.

Further, the rear magnetic pieces (6a) and (6b) are constructed in the same manner as the conventional one, and have the same functions and effects.

FIG. 2 is a front view showing the magnetic field distribution (IOF) on the front side of the vertical deflection magnetic field, and corresponds to FIG. 6(a).

As can be seen from this figure, the magnetic pieces (6C) to (6f) are
Similar to the conventional front magnetic pieces (5c) to (5f), the front vertical deflection magnetic field (IOF) is formed in a pincushion shape. Therefore, the distribution of the vertical deflection magnetic field QO is similar to the conventional one shown in FIG. The deflection device with reduced pincushion distortion is installed 1'4 (this, magnetic pieces (5C) to (5f)
) is small and simple in shape, so it is inexpensive, and
Deterioration of the deflection efficiency of the vertical deflection coil (2) is reduced.

In addition, the four front magnetic pieces (5C) to (5f) act to strengthen the pincushion shape of the horizontal deflection magnetic field 111 formed by the horizontal deflection coil (4), as shown in FIG. .

When the pincushion shape of this horizontal deflection magnetic field q11 becomes stronger, it acts to correct the vertical pincushion distortion of the raster into a barrel shape.

In addition, by strengthening the pincushion shape of this horizontal deflection magnetic field 01J, it is effective in correcting the reverse cross pattern of the convergence error (trilemma) shown in Figure 4, and the vertical and horizontal deflection distortions are corrected at the same time. It is possible to obtain convergence characteristics.

In the above embodiment, magnetic pieces (5C) to (5f), and (
Although 6a) and 6b are made of K'X steel plate or permalloy, they are not limited to these magnetic materials, and their shapes are not limited to the shapes of the embodiments.

[Effects of the Invention] This invention provides a pincushion-shaped magnetic field distribution on the front side of the screen deflection magnetic field and a member for correcting the rear side with two magnetic pieces on the rear side and four magnetic pieces on the front side. (Since tζ is disposed between the vertical deflection coil and the horizontal deflection coil, it is possible to form a vertical deflection magnetic field distribution with a certain humidity with a small and simple shape, and there is no decrease in vertical deflection sensitivity, making it an inexpensive deflection device. is sounded.

[Brief explanation of drawings]

Figure 1 (a) is a side view of an embodiment of the present invention with the ferrite core and vertical deflection coil removed; FIG. 2 is a front view seen from line C, FIG. 2 is a diagram showing the vertical deflection magnetic field distribution at the position of FIG. 1 (cl) of this embodiment, and FIG. Figure 5 (
al is a side view of the conventional deflection device, (bl is its front view, Fig. 6 (a) is a vertical deflection magnetic field distribution diagram for explaining the action of the front cross arm, and Fig. 6 (b) is the same. Vertical deflection magnetic field distribution to explain the action of the rear cross arm Figures 9 and 7 show the magnetic field distribution of the vertical deflection magnetic field in the tube axis direction to achieve both self-convergence and no distortion. (1) ... Ferrite core, (2) ... Vertical deflection coil, (3) ... Separator, (4) ... Horizontal deflection coil, (5c) to (5f). +6a), (sb) - Magnetic piece, (9)...Central axis, α
O...Vertical deflection sensitivity, q...Horizontal deflection magnetic field. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A color cathode ray tube having an in-line electronic mirror,
A saddle-shaped horizontal deflection coil that generates a pincushion-shaped deflection magnetic field,
In a deflection device having a vertical deflection coil wound in a toroidal shape, two magnetic pieces are arranged on the rear side between the horizontal deflection coil and the vertical deflection coil at positions symmetrical to the center axis in the vertical direction. and four magnetic pieces arranged on the front side in symmetrical positions along the center axis in the left and right diagonal up and down directions, and the front side is shaped like a pincushion so as to strengthen the rear side of the vertical deflection magnetic field, and
A deflection device characterized by having a barrel shape as a whole. (2) The deflection device according to claim 1, wherein the centers of the four magnetic pieces on the front side are formed to be located within a range of 30° to 70° with respect to a horizontal axis passing through the central axis.