JPH0422049A - Deflecting device for cathode-ray tube - Google Patents

Abstract

PURPOSE:To solve problems regarding withstand voltage by dividing each of two deflecting coils using a middle extension wire into two coil portions one located in front of and the other behind the middle extension wire when seen from the direction in which to start winding each coil, while varying the ratio of the inductance of the two coil portions to each other from one deflecting coil to the other. CONSTITUTION:One deflecting coil 20B is wound in the direction opposite to that in which the other deflecting coil 20A is wound and the deflecting coils 20A, 20B are disposed opposite each other so that the inductance of a winding- finishing side coil portion 22c located in front of a middle extension wire 21b when seen from the direction in which to start winding each coil is Lm, while the inductance of a winding-start side coil portion 22d located behind the middle extension wire 21b is Ln. The coils can therefore be connected to each other without bringing the high-voltage side portion of one coil located on current supply side into contact with the low-voltage side portion of the other coil where voltage is dropped by the inductance of the coil. The problem of withstand voltage is thus solvent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Industrial Application Field) The present invention relates to a cathode ray tube deflection device having at least one pair of saddle-shaped deflection coils. The present invention relates to a deflection device for a cathode ray tube that is divided by lead wires.

(Prior Art) Generally, a deflection device for a cathode ray tube consists of a pair of horizontal deflection coils that generate a magnetic field that horizontally deflects the electron beam emitted from the electron gun of the cathode ray tube, and a pair that generates a magnetic field that deflects the electron beam vertically. A saddle-saddle type having a vertical deflection coil, each pair of horizontal and vertical deflection coils being a saddle type, and arranged vertically or horizontally symmetrically across a horizontal axis or a vertical axis perpendicular to the tube axis. The deflection device or a pair of horizontal deflection coils are arranged vertically symmetrically across a horizontal axis perpendicular to the tube axis. Semi-toroidal deflection devices in which deflection coils are vertically symmetrically arranged across a horizontal axis are widely used.

As an example, FIG. 3 shows the specific structure of a semi-toroidal deflection device installed in, for example, a color picture tube. In this semi-toroidal deflection device, a pair of saddle-shaped horizontal deflection coils (2a) and (2b) are arranged vertically symmetrically across the horizontal axis inside a cylindrical separator (1).
is arranged, and a pair of toroidal vertical deflection coils (4a) and (4b) wound around the core (3) are arranged vertically symmetrically across the horizontal axis on the outside of the seven rake (1). There is.

Conventionally, a pair of saddle-shaped deflection coils of such a deflection device have been manufactured using one mold. In this case, the winding directions of the pair of coils are reversed so that when the pair of coils are placed facing each other as shown in Figure 3, the opposing pair of coils generate magnetic fields in the same direction. The wires are connected so that when a current is passed from the beginning of winding of one coil, the current flows from the end of winding of the other coil.

In a pair of saddle-type deflection coils configured in this way, the inductance of the windings before and after the intermediate lead wire is the same, whether it is a normal deflection coil without an intermediate lead wire or a deflection coil with an intermediate lead wire. A deflection coil designed in this manner does not pose any particular problem in terms of withstand voltage. However, with respect to a deflection coil in which the windings before and after the intermediate lead-out wire have different inductances, a problem arises in terms of withstand voltage.

In other words, due to the difference in the windings before and after the intermediate leader wire, the inductance of the windings before and after the intermediate leader wire is LotSLn.
Regarding a pair of deflection coils where (L port ≠ Ln), as shown in Fig. 4, the inductance of the winding (7a) on the winding start side before the intermediate lead wire (6a) when viewed from the winding start direction. The inductance of the winding (7b) at the end of the winding after the intermediate lead wire (6a) is Ln.For one deflection coil (8A), the other deflection coil (8B) facing it is , the inductance Ln of the winding (7c) on the winding start side before the intermediate lead wire (6b)
, the winding on the winding end side after the intermediate lead wire (6b) (
7d) are arranged to face each other so that the inductance is LIm. Moreover, a pair of deflection coils (8A) like this
, (8B), when they are placed facing each other, the windings of each coil (8A) and (8B) are wound in opposite directions, similar to a normal deflection coil without an intermediate lead wire. It's dark.

Therefore, in this deflection device, the inductance is L
Assuming that a current is passed from the winding side of a to the winding of inductance or Ln, in one deflection coil (8A), the arrow (5
), the current flows in the winding direction of the windings (7a) and (7b), as (9a)-(10a) = (lla). On the other hand, the other deflection coil (8B) generates a magnetic field in the same direction as one deflection coil (8A),
And in order for current to flow from the winding with inductance Lm to the winding with inductance Ln, the current must be (12) - (9b) → (10b) - (llb) -
It is necessary to connect the wires so that they flow with (13).

Figure 5 shows this pair of deflection coils (8A) and (8B).
) is shown in a circuit diagram. According to this circuit diagram, the windings (7a) and (7b) before and after the intermediate lead wire
), (7c), and (7d), which have different inductances, do not seem to have any problems in terms of withstand voltage. However, in a pair of deflection coils (8A) and (8B) wound with one actual mold, the windings near (12> and (13)) are in contact and are located on the current supply side (
In contrast to 12), (13), which drops voltage due to the inductances Lm and Ln of the windings (7c) and (7d), is on the low voltage side, and with normally used insulated copper wire, there is a problem with the withstand voltage. becomes.

(Problem to be Solved by the Invention) As described above, the pair of saddle-type deflection coils of the deflection device for a cathode ray tube are generally manufactured using one mold, and the winding direction of the pair of coils is The two coils are wound in opposite directions to generate a magnetic field in the same direction, and the wires are connected so that when a current flows from the beginning of one coil, the current flows from the end of the winding of the other coil. Therefore, especially for a deflection coil that has an intermediate lead wire and the windings before and after the intermediate lead wire have different inductances, if you try to connect each deflection coil so that current flows from the winding side with the same inductance, The high voltage side part located on the current supply side and the low voltage side part where the voltage has dropped due to the inductance of the winding come into contact, and with the normally used insulated wire, the withstand voltage becomes a problem.

The present invention has been made to solve the above problems, and is directed to a current supply side of a pair of saddle-type deflection coils that have an intermediate lead wire and in which the windings before and after the intermediate lead wire have different inductances. The purpose of this invention is to avoid contact between the high voltage side part of the winding located at the winding and the low voltage side part where the voltage has dropped due to the inductance of the winding, thereby solving problems regarding withstand voltage.

[Structure of the Invention] (Means for Solving the Problems) At least a pair of saddle-shaped deflection coils are arranged axially symmetrically across a tube axis, and each winding or intermediate lead-out wire of the pair of saddle-shaped deflection coils is provided. In a cathode ray tube deflection device divided by a pair of saddle-type deflection coils, for one deflection coil, the ratio of the inductance of the windings before and after the windings divided by the intermediate lead wire, as viewed from the winding start direction, is LIIl+Ln The other deflection coil was divided at a winding ratio of Ln:Li, which is the inductance ratio of the windings before and after being divided by the intermediate lead wire when viewed from the winding start direction.

(Function) As described above, when looking from the winding start direction of the front and rear windings divided by the intermediate lead wire, one deflection coil has an inductance ratio of Lm:Ln, and the other deflection coil has an inductance ratio of Ln. :Li, it is possible to connect the high-voltage side part of the winding located on the current supply side and the low-voltage side part where the voltage has dropped due to the inductance of the winding so that they do not come into contact with each other. Voltage problems can be avoided.

(Example) Hereinafter, the present invention will be described based on an example with reference to the drawings.

FIG. 1 shows a pair of saddle-shaped deflection coils with intermediate lead wires according to one embodiment. This saddle type deflection coil may be either a horizontal deflection coil or a vertical deflection coil of a saddle-saddle type deflection device that deflects an electron beam emitted from an electron gun of a cathode ray tube in horizontal and vertical directions, or may be a semi-saddle type deflection coil. It may also be a horizontal deflection coil of a toroidal deflection device.

This pair of saddle-shaped deflection coils consists of one deflection coil (
2OA>, when manufacturing using one mold, the inductance of the winding (22a) on the winding start side before the intermediate lead-out wire (21a) when viewed from the winding start direction, or Lll, the intermediate lead-out wire ( The winding (22b) on the winding end side after 21a) is manufactured so that the inductance thereof is Ln. For this one deflection coil (2OA),
The other deflection coil (20B) is manufactured with the winding direction reversed, and the intermediate lead wire (21
b) They are arranged to face each other so that the inductance of the winding (22e) on the winding end side before the intermediate bow wire (21b) is Lll, and the inductance of the winding (22d) on the winding start side after the intermediate bow wire (21b) is Ln. There is.

And this pair of deflection coils (20A), (20
In order to generate a magnetic field in the same direction in B), one deflection coil (2OA> 3a) → (24a) - "(25a
), and when a current is passed from winding 1 (22a) with inductance LIll to winding (22b) with inductance Ln, (23b) −(
24b)-(25b), and the inductance is Lm
from the winding (22c) to the winding (22c) with inductance Ln.
2d) is connected so that current flows through it. FIG. 2 is a circuit diagram showing the connection of this pair of deflection coils (2OA) and (20B).

By the way, as in this example, each deflection coil (2OA)
, (20B), like a pair of conventional saddle-type deflection coils with an intermediate lead wire, the high voltage side part located on the current supply side and the low voltage side part where the voltage has dropped due to the inductance of the winding are connected. It is possible to connect the wires without contacting them, and it is possible to solve the withstand voltage problem that occurred in a conventional pair of saddle-type deflection coils with intermediate lead wires.

[Effects of the Invention] In a cathode ray tube deflection device that has at least a pair of saddle-type deflection coils and is divided by each winding of the pair of saddle-type deflection coils or an intermediate lead wire, one of the deflection coils has a winding. The windings are divided at a winding ratio such that the ratio of inductance between the front and rear windings is Lffl:Ln when viewed from the winding start direction, and the other deflection coil is divided by the intermediate lead wire as seen from the winding start direction. If the windings are divided at a winding ratio where the inductance ratio of the windings before and after the division is Ln:I, +, the voltage will drop between the high voltage side of the winding located on the current supply side and the low voltage caused by the inductance of the winding. The wires can be connected without contacting the side parts, and coils can be manufactured using insulated wires in the same way as deflection devices without intermediate lead wires, and a pair of saddle type with conventional intermediate lead wires It is possible to avoid the problem of withstand voltage that occurs in the deflection coil.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a pair of saddle-shaped deflection coils with an intermediate lead wire of a deflection device for a cathode ray tube that is an embodiment of the present invention, and FIG. 2 is a circuit diagram showing the connection of the pair of saddle-shaped deflection coils. FIG. 3 is a diagram showing the configuration of a semi-toroidal deflection device having a pair of saddle-type horizontal deflection coils,
FIG. 4 is a diagram showing the configuration of a pair of saddle-type deflection coils with an intermediate lead wire of a conventional deflection device for a cathode ray tube, and FIG. 5 is a circuit diagram showing the connection of the pair of saddle-type deflection coils. 2OA...one deflection coil, 20B...other deflection coil, 21a, 21b...intermediate lead wire, 21a-21d...winding wire. Agent Patent Attorney Norihiro Ogo ■ Figure 0B Figure Figure Figure Figure

Claims (1)

[Claims] A cathode ray tube deflection device comprising at least a pair of saddle-type deflection coils arranged axially symmetrically across the tube axis, and each winding of the pair of saddle-type deflection coils is divided by an intermediate lead wire, wherein One deflection coil and the other deflection coil of the saddle-type deflection coil are divided at a winding ratio in which the inductance ratios of the windings before and after the windings divided by the intermediate lead wire are different from each other when viewed from the winding start direction. A deflection device for a cathode ray tube characterized by the following.