JPH05225931A - Travelling wave type deflection device - Google Patents

Abstract

PURPOSE:To facilitate the formation of an earth conductor and an insulation base body into one body by establishing easily and with accuracy the mutual interval between a first and a second deflection body in a travelling wave type deflection device. CONSTITUTION:A travelling wave type deflection device 10 is constituted by combining a first and a second earth conductor 25, 28, a first and a second insulation base body 23, 26, a first and a second spiral conductor 24, 27 and a first and a second mounting plate-like electrode 31, 38. Protruding parts 23a, 23b, 26a, 26b are provided on the first and the second insulation base body 23, 26, and the mutual interval between a first and a second deflection body 21, 22 is determined by bringing them face to face to each other. The first and the second insulation body 23, 26 are held between the first and the second earth conductor 25, 28, which are fixed on the mounting plate-like electrodes 31, 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling wave type deflection device for a cathode ray tube used in an oscilloscope, a storage oscilloscope and the like.

[0002]

2. Description of the Related Art If the deflection voltage does not change while the electron beam passes through a deflecting device, it is possible to obtain the deflection of the electron beam in proportion to the magnitude of the deflection voltage. However, if the deflection voltage changes while the electron beam passes through the deflector due to the high frequency of the deflection voltage, the desired deflection becomes impossible. In order to solve this problem, a traveling wave type deflection device is used in a CRT (cathode ray tube) for observing a signal of DC-several hundred MHz. In the traveling wave deflector,
The traveling speed of the deflection signal propagating from one end to the other end of the traveling-wave type deflection conductor (slow-wave circuit) of the spiral type and the traveling speed of the electron beam are made substantially equal. As a result, the deflection action time becomes long, the electron beam can be sufficiently deflected, and it becomes possible to provide a wide-band deflection device.

In order to form such a traveling wave type deflector easily and firmly, conventionally, a strip-shaped conductor is spirally wound around a long insulating base to insulate the first and second deflectors from each other. For example, Japanese Patent Application No. 2-121236 has a structure in which two grooves are provided in each of the bases, two earth conductor plates are arranged therein, and the two earth conductor plates are fixed by welding or the like to sandwich one insulating base. No.

[0004]

By the way, in the deflecting device disclosed in the above-mentioned application, since one insulating base is sandwiched between two ground conductor plates, integration of these can be easily achieved. Since two ground conductor plates are arranged in one deflector, the area of the spiral conductor and the ground conductor plate facing each other becomes large, and it is difficult to design the characteristic impedance of the deflection system to be high. Further, in the conventional deflecting device, it is necessary to determine the mutual distance between one and the other of the pair of deflecting members by using an assembling jig, and to incorporate it into the CRT electrode structure, so that accurate assembling can be easily achieved. Was difficult. In addition, for the characteristic inspection of the deflecting device, a C
It could only be done after it had been incorporated into the RT electrode assembly. If it is found that the deflecting device is defective after being incorporated into the CTR electrode structure, not only the deflecting device but also other electrode systems are disabled, which increases the cost of the CRT.

SUMMARY OF THE INVENTION An object of the present invention is to provide a traveling wave type deflection device which can determine the mutual distance between a pair of deflecting bodies before being incorporated in a CRT.

The present invention for achieving the above object comprises first and second deflecting bodies which are arranged to face each other with an electron beam passage interposed therebetween, and the first and second deflecting bodies are arranged so as to direct the electron beam. A long insulating substrate extending along the traveling direction, a strip-shaped conductor spirally wound around the insulating substrate, and a groove formed on the insulating substrate so as to extend along the traveling direction of the electron beam. A traveling wave type deflecting device having a ground conductor disposed in each of the first and second
A protrusion for determining the mutual distance between the strip-shaped conductors of the first deflector is provided on at least one of the insulating bases of the first and second deflectors, and the first protrusion is provided via the protrusion. And the insulating base of the second deflector is abutted against the traveling wave type deflector. As described in claim 2, the first and second
Plate electrodes for mounting are provided, one end and the other end of the ground conductors of the first and second deflecting bodies are fixed thereto, and the insulating bases of the first and second deflecting bodies are provided as the first and second insulating bodies. It is desirable to sandwich it between the ground conductors of the second deflector.

[0007]

The projection in the present invention functions as a spacer for the first and second deflectors, and determines the mutual distance between the two.
Since the insulating bases of the first and second deflectors come into contact with each other via the protrusions, the positional relationship between the two can be accurately set without relying on a jig. The first and second attachment plate-shaped electrodes in claim 2 have a function as a fixing portion of the ground electrodes of the first and second deflecting bodies, and further have a function as a attaching portion to the CRT electrode assembly.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A CRT of an oscilloscope according to an embodiment of the present invention will be described with reference to FIGS. This CR
As shown in FIG. 1, T1 includes an exhausted tube body 2, a cathode ray tube electrode assembly 3 incorporated therein, and a fluorescent screen 4. The cathode ray tube electrode assembly 3 includes an electron gun 7 including an assembly 5 of a cathode and a control grid and an anode 6, a first quadrupole lens 8, a second quadrupole lens 9, a vertical deflection device 10 according to the present invention, and a third quadrupole lens. It is equipped with a quadrupole lens 11, a horizontal deflection device 12, and a deflection magnifying electron lens 13, which are supported by common insulating supports 14 and 15. The fluorescent screen 4 includes a face plate 16, a fluorescent material layer 17, and a conductor layer 18. The conductor layer 18 extends to the vicinity of the deflection magnifying lens 13 and the post-stage acceleration electrode 19 extends.
It is connected to the.

The vertical deflection apparatus 10 according to the present invention is shown in FIG.
As is clear from the above, the first and second deflecting bodies 21 and 22 are arranged in parallel to the beam traveling direction so that the electron beam passage 20 can be obtained. First and second deflector 2
1 and 22 are arranged in parallel because the quadrupole lenses 8, 9 and 11 are used as the lens system of the CRT 1, and the first quadrupole lens 8 acts as a concave lens in the Y direction, and
This is because the quadrupole lens 9 of (1) acts as a convex lens, so that the beam in the Y direction passes while being narrowed in the vertical deflection device 10. If the beam is squeezed in this way, the first
Even if the second deflecting bodies 21 and 22 are parallel, the deflected beam reaches the screen 4 without being cut by the deflecting bodies 21 and 22. Of course, the first and second deflecting bodies 21 and 22 are arranged so as to gradually spread toward the screen 4, or 1/2 the length of the deflecting bodies 21 and 22.
It is also possible to form it so that it begins to spread from the location.

The first and second spiral conductors 24 and 27 are belt-shaped metal plates made of alumina and made of the first and second insulating bases 2.
It consists of 3 and 26 windings. And the first and second
In order to connect the spiral conductors 21 and 22 of the present invention to the deflection signal source, lead wires 40, 41 and 4 are provided at one end and the other end thereof, respectively.
2, 43 are connected respectively.

As shown in FIG. 3, the first deflector 21 is a first deflector.
The insulating substrate 23, the first spiral conductor 24, and the first ground conductor 25 made of a metal plate are arranged so as to extend in the beam traveling direction (Z-axis direction). Similarly, the second deflector 22 also includes a second insulating base 26, a second spiral conductor 27, and a second ground conductor 28 made of a metal plate, and extends in the beam traveling direction (Z-axis direction). Are arranged as follows. The deflecting device 10 includes the first and second deflecting bodies 2
Insulating support 1 of CRT electrode assembly 3 by integrating 1 and 22
It has metal-made first and second attachment plate electrodes 31 and 38 for attachment to the electrodes 4 and 15. Therefore, in this embodiment, the assembly of the deflecting device 10 with the insulating supports 14 and 15 removed from FIG. 2 is preformed and the unitized assembly is beaded with the other electrodes of the CRT. Form the CRT electrode structure 3.

First and second mounting plate electrodes 31, 38
, The first and second ground conductors 25, 26 of the first and second deflecting bodies 21, 22 are engaged. Therefore, the first and second ground conductors 25 and 26 have a strength capable of supporting the first and second insulating bases 23 and 26 and the first and second spiral conductors 23 and 24. It consists of a metal plate. As shown in the perspective view seen from the screen side in FIG. 7, the first and second ground conductors 25 and 26 have central portions 25a and 28 extending in the beam traveling direction (Z-axis direction).
a, first engaging portions 25b and 28b for engaging the first attachment plate electrode 31, and the second attachment plate electrode 3
Second engaging portions 25c, 28c for engaging with 8, and
Insulating base positioning wall portions 25d, 28d, 25e, 28 rising from one end and the other end of the central portions 25a, 28a.
with e.

The first and second insulating substrates 23 and 26 are
As shown in FIG. 4, the first and second ground conductors 25, 28
It has grooves 29 and 30 for inserting. This groove 29,
30 extends longitudinally in the beam traveling direction. As shown in FIG. 4, the first and second insulative bases 23 and 26 have an H-shaped cross-sectional shape, and have a groove 29 in the central portion connecting the left and right side walls.
30 is formed. Further, the first and second insulating bases 23 and 26 have leg portions or projecting portions 23a and 26 at both ends.
a, 23b and 26b, and the protrusions 23a and 23b of the first insulating base 23 and the protrusion 2 of the second insulating base 26.
3b and 26b are abutted with each other, thereby determining the mutual distance between the first and second spiral conductors 24 and 27.

The first mounting plate electrode 31 has an electron beam passage hole 31a at the center, an engaging groove 31b for engaging the first and second arm conductors 25 and 28, and FIG. It has a fixing portion 31c for the insulating supports 14 and 15 shown. The second attachment plate electrode 38 includes an electron beam passage hole 38a, a pair of engagement holes 38b for engaging the first and second ground conductors 25 and 28, the insulating support 14,
It has four fixing parts 38c for 15.

When the deflecting device 10 is assembled, first, the central portions 25a, 2 of the first and second ground conductors 25, 28 are inserted into the grooves 29, 30 of the first and second insulating bases 23, 26.
8a are arranged respectively. First and second ground conductors 25,
Positioning of the first and second insulating substrates 23 and 26 with respect to 28 in the beam traveling direction (Z-axis direction) is performed by the pair of wall portions 25d, 28d and 2 of the first and second ground conductors 25 and 28.
5e, 28e. The deflector 2 is shown in FIGS.
First arm conductor 25 and first insulating base 2 in FIG.
3 and the first spiral conductor 24 are shown,
The second deflector 22 is also constructed in exactly the same manner.

The first and second deflectors 21 and 22 are not independently attached to the insulating supports 14 and 15 of the CRT electrode assembly 3, but are integrated into the first and second attachment plate electrodes 31 and 38. And install it. First and second attachment plate electrodes 31, 3
The engagement of the first and second ground conductors 25 and 28 with respect to 8 is performed as shown in FIG. In FIG. 8, the first and second insulative substrates 23, 26 have been removed to clearly show the engagement of both. First and second ground conductors 25, 28
The first engaging portions 25b, 28b at one end of the first fitting plate electrode 31 are fitted into the engaging groove 31a of the first mounting plate electrode 31 and welded, and the second engaging portions 25c, 28c at the other end are the second engaging portions 25c, 28c. Plate electrode for mounting 38
Are fitted into the engaging holes 38b of the above and welded. At this time, the protrusions 23a and 23b of the first insulating substrate 23 and the protrusions 26a and 26b of the second insulating substrate 26 are butted against each other as shown in FIGS. The mutual distance between the spiral conductors 24 and 27 is fixed.

When the assembly of the first and second deflecting bodies 21 and 22 and the first and second mounting plate electrodes 31 and 38 is completed, the deflection characteristic is measured at this stage using an inspection device. Then, only good products are incorporated into the CRT electrode structure 3. That is, the fixing portions 31c and 38c of the plate-shaped electrodes 31 and 38 for attachment are fixed to the insulating supports 14 and 15 at the same time as the other electrodes.

When the deflecting device 10 is constructed as in this embodiment, the protruding portions of the first and second insulating bases 23 and 26 are independent of the mounting positions of the first and second ground conductors 25 and 28. The mutual spacing between the first and second spiral conductors 24, 27 can be determined depending on the heights of 23a, 23b, 26a, 26b, and the mutual spacing can be set easily and accurately. .. In addition, the first and second deflectors 21,
22 and the first and second plate-shaped electrodes 31 and 38 for mounting can be unitized, so that the inspection can be performed at this stage. There is no risk of incorporating defective products into the CRT electrode structure 3, and the yield of CRTs can be improved. Further, the axis of the CRT electrode structure 3 and the axis of the deflecting device 10 can be easily aligned with each other. Further, the positioning of the first and second insulating substrates 23 and 26 with respect to the first and second ground conductors 25 and 28 in the Z-axis direction is performed first.
And the rising wall portions 25d of the second ground conductors 25 and 28,
28d, 25e, 28e can be easily achieved. Further, since the first and second deflecting bodies 21 and 22 have only one earth conductor 25 and 28, respectively, as compared with the conventional two earth conductors sandwiching one insulating substrate. The capacitance between the spiral conductors 24 and 27 and the ground conductors 25 and 28 becomes small. Therefore, the characteristic impedance can be increased without sacrificing the transmission characteristics such as the phase velocity of the traveling wave transmission line. When it is not necessary to design the characteristic impedance to be high, the insulating bases 23 and 2 are reduced by the amount by which the capacitance is reduced by using one earth conductor 25 and 28.
It is possible to increase the capacitance based on No. 6, and a relatively low-cost high-dielectric-constant insulating material such as alumina is used as the material of the insulating bases 23 and 26, and the cost can be reduced. .. In addition, the first and second ground conductors 2
5, 28, the first and second insulating bases 23, 26
Since it is sandwiched and integrated with the first and second attachment plate electrodes 31 and 38, the deflecting device can be configured with a small number of parts.

[0019]

MODIFICATION The present invention is not limited to the above-described embodiments, and the following modifications are possible, for example. (1) Instead of the engagement hole 38b of the second plate electrode for attachment 38, a fitting groove may be formed. (2) The engaging portions 25b, 28b at one end of the first and second ground conductors 25, 28 and the engaging portions 25c, 28c at the other end
Similar to the positioning wall portions 25f and 28f adjacent to, can be provided. Further, the groove 31b can be a hole. (3) It can also be applied to a storage tube having a storage target.

[0020]

As described above, according to the first aspect of the present invention, the mutual interval between the first and second spiral conductors can be set easily and accurately. According to the invention of claim 2, the above effect can be obtained, and further, the insulating bases of the first and second deflecting bodies are sandwiched by the ground conductors of the first and second deflecting bodies, and these are provided. Integration can be easily achieved with a small number of parts. In addition, since the first and second deflectors are integrated before being incorporated in the CRT electrode assembly, it is possible to perform characteristic inspection in this state and prevent defective products from being incorporated in the CRT electrode assembly.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a CRT according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing the traveling wave type deflector of FIG.

FIG. 3 is a front view showing first and second deflectors of FIG.

FIG. 4 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 5 is a partially cutaway perspective view of a first deflector.

6 is a central longitudinal sectional view of the deflecting body shown in FIG.

FIG. 7 is a perspective view showing a plate electrode for attachment and a ground conductor plate.

FIG. 8 is a perspective view showing a state in which a mounting plate electrode and an earth conductor plate are engaged with each other.

[Explanation of symbols]

 21 1st deflector 22 2nd deflector 23 1st insulating base 26 2nd insulating base 24 1st spiral conductor 27 2nd spiral conductor 25 1st earth conductor 28 2nd Earth conductor 31 First mounting plate electrode 38 Second mounting plate electrode

Claims (2)

[Claims] 1. An elongate insulating member comprising first and second deflecting members arranged to face each other with an electron beam passage interposed therebetween, wherein the first and second deflecting members extend in a traveling direction of the electron beam. A conductive base, a strip-shaped conductor spirally wound around the insulating base, and an earth conductor arranged in a groove formed in the insulating base so as to extend along the traveling direction of the electron beam. In the traveling wave type deflection device having, the protrusion for determining the mutual interval of the strip-shaped conductors of the first and second deflectors has an insulating base of the first and second deflectors. A traveling wave type deflection device, which is provided on at least one of the first and second deflection bodies, and the insulating bases of the first and second deflection bodies are abutted to each other via the protrusion. 2. A first and a second plate electrode for attachment, wherein one end of the ground conductor of the first and second deflector is fixed to the first plate electrode for attachment. , The other ends of the ground conductors of the first and second deflecting bodies are fixed to the second mounting plate electrode, and the insulating bases of the first and second deflecting bodies are the first and second insulating bodies. The traveling wave type deflecting device according to claim 1, wherein the second deflecting member is sandwiched by the ground conductors.