JPH02121237A - Traveling wave deflector - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a traveling wave type deflection device for a #R polar ray tube (CRT).

[Prior Art] If the deflection voltage does not change while the electron beam passes through a deflection device, it is possible to obtain a deflection of the electron beam that is proportional to the magnitude of the deflection voltage. However, if the deflection voltage changes while the electron beam passes through the deflection device because the frequency of the deflection voltage is high, desired deflection becomes impossible.

To solve this problem, traveling wave deflectors have been used. In a traveling wave deflection device, the traveling speed of the deflection voltage (deflection signal) propagating from one end of a helical traveling wave deflection conductor (delay circuit) to the other end almost matches the traveling speed of the electron beam. let As a result, the deflection action time becomes longer, the electron beam can be sufficiently deflected, and a broadband deflection device can be provided.

In order to easily and firmly form such a traveling wave deflection device, a strip-shaped conductor is spirally wound around a long insulating substrate, and the conductor is wound inside the groove of the insulating substrate so as to be inside the spiral conductor. It is proposed to place a ground conductor at

[Problems to be Solved by the Invention] However, since the ground conductor is placed close to the spiral conductor and the beam path, when a deflection signal propagates through the spiral conductor, a current is induced in the ground conductor, and this induced current The disadvantage is that the magnetic field based on the ion beam causes unnecessary electromagnetic deflection of the electron beam.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a traveling wave deflection device that can prevent current from flowing through a ground conductor.

[Means for Solving the Problems] The present invention for achieving the above object comprises first and second deflecting bodies arranged opposite to each other with an electron beam path in between, and the first deflecting body and a first earth conductor extending in the same direction as the first spiral conductor and disposed inside the first spiral conductor; A deflection body includes a second helical conductor and a second ground conductor extending in the same direction as the second helical conductor and disposed inside the second helical conductor, providing a first deflection signal of a first polarity to the first helical conductor and providing a second deflection signal of a second polarity opposite the first polarity to the second helical conductor; In a traveling wave deflection device configured to
a current induced in the first ground conductor by applying a first deflection signal to the first helical conductor; and a current induced in the first ground conductor by applying a second deflection signal to the second helical conductor. The first ground conductor and the second ground conductor are connected so that the current induced in the second ground conductor cancels out.
This invention relates to a traveling wave deflection device characterized in that it is connected to a ground conductor.

The above object can also be achieved by connecting one ends of the first and second ground conductors to the ground and leaving the other ends open.

[Function] In the above invention, the first and second earth conductors are connected to each other so that the induced current in the first earth conductor and the induced current in the second earth conductor cancel each other out. This lick, in which substantially no current flows in the first and second ground conductors when the first and second deflection signals are applied to the second helical conductor, causes deflection disturbances based on the current in the ground conductor. Does not occur.

When the other ends (one fill) of the first and second ground conductors are opened, no current flows through the ground conductors because a closed circuit through which current flows is not formed.

In this case, in a high frequency band, a voltage may be generated on the open side of the ground conductor due to capacitive coupling. Therefore, the configuration according to claim 2 is effective in removing current in the ground conductor in a low frequency band.

[First Embodiment] Next, an oscilloscope CRT according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

As shown in Fig. 2, this CRTI
, a 1#R polar ray tube electrode ellipse 3 incorporated therein, and a fluorescent screen 4.

The cathode ray tube electrode assembly 3 includes an electron gun 7 consisting of a cathode and control grid assembly 5 and an anode 6, a first quadrupole lens 8, a second quadrupole lens 9, a vertical deflection device 10 related to the present invention, Third quadrupole lens 11, horizontal deflection device 1
2 and a deflection magnifying electron lens 13, which are supported on a common insulating support 14,15.

The fluorescent screen 4 consists of a face plate 16, a fluorescent material 117, and a conductive layer 18. The conductor layer 18 is a post-accelerating electron beam extending to the vicinity of the deflection magnifying electron lens 13.
It is connected to the.

As is clear from FIG. 1, the vertical deflection devices 10 according to the present invention are arranged to face each other across a beam path 20, and
It also includes first and second deflectors 21 and 22 arranged such that the distance between them increases as the beam advances in the direction of travel. As shown in FIG. 3, the first deflector 21 is made up of a first insulating substrate 23, a first spiral conductor 24, and a pair of first ground conductors 25a, 25b. (Z-axis direction).

Similarly, the second deflector 22 also includes a second insulating substrate 26,
A second spiral conductor 27 and a pair of second ground conductors 28
a and 28b, and are arranged to extend in the beam traveling direction (Z-axis direction).

First and second ground conductors 25a, 25b, 28a, 2
8b consists of a band-shaped metal plate having a strength capable of supporting the first and second insulating substrates 23.26 and the first and second spiral conductors 23.24, and is
The first and second insulating substrates 23 extend in the axial direction).
．． It is arranged in 7R29,30 provided in 26. First and second ground conductors 25a, 25b, 28a,
28b is located inside the first and second spiral conductors 24.27, and forms a traveling wave transmission circuit together with the first and second spiral conductors 24.27.

The first and second helical conductors 24.27 consist of strip metal plates wound around first and second insulating substrates 23.26. In addition, in order to easily and accurately form the first and second spiral conductors 24.27, a pair of side surfaces of the first and second insulating substrates 23.26 are provided with 71 as shown in FIG.
31 are provided. First and second spiral conductors 21
．． 22 to the deflection signal source, one end of these and #! Lead wires 32, 33, 34, and 35 are connected to the ends, respectively.

First and second ground conductors 25a each consisting of two sheets
, 25b, 28a, and 28b are connected to each other by a connecting conductor 36 at one end and the other end, respectively, as shown in FIG. First and second ground conductors 25a, 25b, 28a
, 28b are bent to function as support legs for the first and second deflectors 21.22, and the insulating supports 14.1
It is supported by 5.

The beam entrance side end of the first ground conductor 25a and the beam exit side end of the second ground conductor 28b are connected to each other by a connecting conductor 37 made of a metal wire.

38 is a beam person! side shield electrode, beam 3
9 has an opening 40 through which it passes. A second ground conductor 28a is connected to this shield electrode 38 by a connection conductor 41 made of a metal wire. 42 is the beam exit l
l! Aperture 4, which is the I shield electrode and through which the beam passes.
It has 3. A first earth conductor [125b] is connected to this shield conductor 5i42 by a connecting conductor 44 made of a metal wire.

[Operation] The inductance per turn of the first and second spiral conductors 24.27 in this vertical deflection device 10 is set respectively, and the inductance per turn of the first and second spiral conductors 24.27 is twice the capacitance C1, the first and second spiral conductors 24.27, and the ground conductors 25a, 25tl, 28a, 2
C1 is the sum of the respective capacitances C2 between the first and second spiral conductors 24, C8 is the capacitance between the adjacent spiral conductors 24, and C8 is the capacitance between the adjacent spiral conductors 24. Characteristics of the delay circuit based on the deflection body 21.22) ω
+・ ・ ・ (1) The second and subsequent terms that depend on the angular frequency ω in equations (1) and (2) are called dispersion terms, and are preferably as small as possible.In this example, the insulating substrate 23.26 Spiral conductor 24.2
7, it is possible to reduce co, and the second term and subsequent terms can be reduced.

The first helical conductor 2 serves to deflect the electron beam 39.
When a first deflection signal (current) of a first polarity (positive) is applied to 4 and a second deflection signal (current) of a second polarity (negative) is applied to the second spiral conductor 27, First spiral conductor 21
A first signal current Is1 flows in the direction in which the beam 39 travels, that is, in the Z-axis direction, and a first signal current Is1 flows in the second spiral conductor 27 in a direction opposite to the direction in which the beam 39 travels (-2 axis direction). A second signal current 's2 flows. Note that since the amplitudes of the first and second deflection currents are approximately the same, the amplitudes of the first and second signal currents II are also approximately the same. and the ground conductor 25a, the shield electrode 38, and the ground conductor 2.
When the pole 8b and the shield are connected with a connecting conductor (not shown), a ground current II flows in the opposite direction to the first and second signal currents 1151' through the first and second spiral conductors 24,27. Kogl・
In the case of g2, the currents induced in the ground conductors 25a, 25b, 28a, and 28b are in the same direction, so the induced current is I +
1, this earth current IIg1 g2
gl,2 imparts an undesirable electromagnetic deflection effect to the electron beam 39. On the other hand, in this embodiment, since the end of the first ground conductor 25a on the beam entrance side and the end of the second ground conductor 28b on the beam exit side are connected by the connecting conductor 37, Earth conductor 25
a, 25b, the connecting conductor 37, the connecting conductor 41, the shield electrode 40, the second earth conductors 28a, 28b,
A ground connection conductor (not shown) to which two shield electrodes 38, 42 are connected, and a shield electrode 42, #Continued l! #
A closed circuit consisting of the body 44 is formed, and the induced current of the first earth conductor 25a, 25b and the second earth conductor 28a,
28b, and no current flows through the first and second ground conductors 25a, 25b, 28a, and 28b. This eliminates the conventional problem of the first and second ground conductors 25a, It is possible to prevent the current flowing through 25b, 28a, and 28b from having an adverse effect on the electromagnetic deflection effect.

[Second Embodiment] Next, a deflection device 10a according to a second embodiment of the present invention shown in FIG. 5 will be described. However, in FIG. 5, parts that are substantially the same as those in FIG. In the deflection device 10a shown in FIG. 5, the beam entrance side portion of the first ground conductor 25a is connected to the beam entrance side shield electrode 38 by a connecting conductor 51, and the beam exit side portion of the second earth conductor 28b is connected to the beam entrance side. It is connected to the side shield electrode 38 by a connecting conductor 52, and the second earth conductor 2
The beam entrance side part of 8a is the beam exit side shield electric f.
! 42 with a connecting conductor 53, and the first earth conductor 2
5b on the beam exit side is connected to the beam exit side shield electrode 42 by a connecting conductor 54. Even if connected in this way, the first ground conductor 25a,
The induced @ current in 25b and the induced current in second ground conductors 28a, 28b cancel each other out, so that no current substantially flows in first and second ground conductors 25a, 25b, 28a, 28b.

[Third Embodiment] FIG. 6 shows a deflection device 10b according to a third embodiment of the present invention.
In FIG. 6, parts common to those in FIG. 1 are given the same reference numerals. In this third embodiment, the first
The beam entrance side portion (one end) of the second ground conductor 25a is connected to the beam entrance side shield electrode 38 by a connecting conductor 61, and the beam entrance side portion (one end) of the second ground conductor 28a is also connected to the beam entrance side shield electrode. 38 through a connecting conductor 62. In FIG. 6, one side (the other end side) of the first and second ground conductors 25a, 25b, 28a, and 28b is in an open state. With this configuration, no flow path is formed between the first and second ground conductors 25a, 25b, 28a, 28b, so no current flows, and in a low frequency band, the ground conductors 25a, 25b, 28a, 28b
becomes a constant ground potential.

[Modifications] The present invention is not limited to the above-described embodiments, and, for example, the following modifications are possible.

(1) A single ground conductor (ground plate) may be arranged in the center of the first and second spiral conductors 24, 27. In this case, for example, the first and second insulating The flexible substrates 23 and 26 are used as base bodies of a laminated structure, and a ground conductor is buried in the center thereof.

(2) Instead of forming the first and second spiral conductors 24, 27 and the ground conductors 25a, 25b, 28a, and 28b from metal plates, they may be formed from a coated and baked layer, a plating layer, or a vapor-deposited layer of conductive paint. Good to have.

(3) Instead of the insulating substrate 23.26, a suitable insulating spacer may be used to maintain a constant distance between the ground conductors 25a, 25b, 28a, 28b and the spiral conductor 24.27.

[Effects of the Invention] As explained above, according to the present invention, the current flowing through the ground conductor can be removed. Therefore, it is possible to provide a traveling wave type deflection device that does not have an electromagnetic opening effect based on the current flowing through the ground conductor.

[Brief explanation of the drawing]

1 is a partially cutaway front view showing a traveling wave type deflection device according to a first embodiment of the present invention; FIG. 2 is a partially cutaway front view showing a CRT equipped with the deflection device of FIG. 1; Fig. 3 is an end view taken along the line ■-■ in Fig. 1, Fig. 4 is a partially cutaway perspective view of the deflection body, and Fig. 5 is a part showing a traveling wave type deflection device according to the second embodiment of the present invention. Cutaway Front View FIG. 6 is a partially cutaway front view showing a traveling wave deflector according to a third embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Vertical deflection device, 21. 22... First and second deflection body, 23... First insulating substrate, 24...
First spiral conductor, 25a, 25b...first earth conductor, 26...second insulating substrate, 27...second spiral conductor, 28a, 28b...second earth conductor,
37... Connection conductor.

Claims (1)

[Scope of Claims] [1] Consisting of first and second deflectors arranged opposite to each other across the path of the electron beam, the first deflector being connected to a first helical conductor and the first helical conductor. a first ground conductor extending in the same direction as the first helical conductor and disposed inside the first helical conductor, and the second deflector is connected to the second helical conductor and the a second ground conductor extending in the same direction as the second helical conductor and disposed inside the second helical conductor; traveling wave deflection configured to provide a first deflection signal of polarity and to provide the second helical conductor with a second deflection signal of a second polarity opposite the first polarity; In the apparatus, a current is induced in the first ground conductor by supplying a first deflection signal to the first helical conductor and a second deflection signal is supplied to the second helical conductor. The first earth conductor and the second earth conductor are connected so that the current induced in the second earth conductor cancels out.
A traveling wave deflection device characterized in that it is connected to a ground conductor. [2] Consisting of first and second deflectors arranged opposite to each other across the path of the electron beam, the first deflector being arranged in the same direction as the first helical conductor and the first helical conductor. a first ground conductor extending and disposed inside the first helical conductor, and the second deflection body is connected to the second helical conductor and the second helical conductor. and a second ground conductor extending in the same direction as the conductor and disposed inside the second helical conductor, the first helical conductor having a first deflection of a first polarity. a traveling wave deflection device configured to provide a second deflection signal of a second polarity opposite to the first polarity to the second helical conductor; and a traveling wave deflection device characterized in that one end of the second ground conductor is connected to the ground, but the other end is not connected to the ground.