JPS63155539A - Electron beam deflection device - Google Patents

Abstract

PURPOSE:To enable a spiral transmission line having a uniform characteristic impedance to be easily formed by providing a pair of a conductive earth member, a pair of a dielectric, and a pair of a spiral conductor. CONSTITUTION:A vertical deflection device 1 is formed by opposingly arranged first and second parts 9 and 10 with a tube axis as the center. These parts 9 and 10 are provided with a spiral conductor 11, a dielectric 12, and an earth conductor 13 respectively, united by an unillustrated supporting member, and fixed to a tube body 2. The first input terminal 14 and the first output terminal 15 are connected to the spiral conductor 11 of the first part 9, and the second input terminal 16 and the second output terminal 17 are connected to the spiral conductor 11 of the second part 10. An earth conductor 13 of the first and second part 9 and 10 is connected to the ground by lead members 18 and 19. Output terminals 15 and 17 are connected to a terminal unit. This constitution enables to obtain a spiral transmission line having a uniform characteristic impedance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a traveling wave type electrostatic deflection device in a cathode ray tube (CckT).

[Conventional technology and its problems]

A helical deflection plate is used to match the moving speed of the electron beam and the traveling speed of the deflection electric field (signal). When a large number of support members are coupled to the spiral deflection plate in order to fix the spiral deflection plate to the tube body of the CRT, the characteristic impedance distribution in the spiral deflection plate is disturbed.

In order to make the characteristic impedance uniform and to facilitate the support of the 21I2 type deflector plate, a structure was proposed in Japanese Patent Publication No. 58-14021 in which a ground conductor was placed inside the spiral conductor and the spiral conductor was fixed to the ground conductor by an insulating support. It is disclosed in the publication No. If you adopt this structure.

Although it certainly reduces the disturbance in % sexual impedance.

Since the spiral conductor must be supported using a large number of insulating supports, its farming is difficult and difficult. There is a possibility that the two-wire struts may cause non-uniformity of characteristic impedance.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electron beam deflection device having a structure that allows a spiral transmission line with uniform characteristic impedance to be easily obtained.

[Means for solving problems]

In order to solve the above-mentioned problems and achieve the above-mentioned objects, the present invention includes a pair of conductive grounding members disposed opposite to each other along a single beam path, and surrounding the pair of 2411 grounding members. and a pair of dielectrics that are mechanically supported, and a first dielectric provided on opposing surfaces of the pair of dielectrics, respectively.
a pair of spiral conductors each comprising a surface portion, a second surface portion provided on a surface opposite to the opposing surface, and a portion connecting the first and second surface portions, respectively. An electron beam deflection device VCg characterized by
It's a bad thing.

[For production]

The dielectric in the above invention forms a transmission line having a desired characteristic impedance and also functions as a ground conductor and a support for the helical conductor. Electron beam transmission of signal 8 to helical conductor 11? If a spiral transmission line is formed so that the transmission speed along Vc is equal to the electron movement speed, it becomes possible to observe high frequency signals.

〔Example〕

Next, with reference to one drawing, an embodiment of the present invention VCe different CRT
and its deflection device will be explained. FIG. 1 shows in principle a CRT including a deflection device 1 according to the invention. This CRT includes a known electron gun 3, a traveling wave type vertical deflection device], a pair of horizontal deflection plates 4, a deflection magnifying lens 5. It is constructed by arranging a fluorescent screen 6 and a rear acceleration electrode 7. The electron beam 8 emitted from the electron gun 3 in the direction of the NuClean 6 is deflected in the vertical direction by the vertical deflection device f1t1, deflected in the horizontal direction by the horizontal deflection f41c, and is projected onto the screen 6 through the deflection magnifying lens 5. be done. As a result, a waveform corresponding to the observed signal supplied to the vertical deflection device can be drawn on the screen 6.

Vertical deflection device] is a first deflection device which is arranged opposite to each other around the tube axis.
i and second part9. ] Consists of O. First and second parts9. 0 is a helical conductor 2, a dielectric 2 and a ground conductor 3, each of which is integrated by a supporting member (not shown) and fixed to a tube body 2. A first input terminal 14 and a first output terminal ]5 are connected to the spiral conductor 1 of the first portion 9, and a spiral conductor 11 of the second portion 10 is connected to the first input terminal 14 and the first output terminal ]5.
is connected to a second input terminal ]6 and a second output terminal ]7. , the ground conductors [3] of the first and second parts 9, 10 are connected to ground by lead members 18, 19. Output terminals 15.17 are connected to a terminator. Note that in order to apply a bias voltage to the signal source connected to the input terminal 1136, the output shrines 15 and 17 may be connected to the bias application power supply Vc via a terminator.

By inputting a positive observed signal to the first input terminal 4 and inputting an opposite observed signal to the second input terminal 16, a vertical deflection electric field is created between the pair of spiral conductors. is obtained.

The first part 9 and the second part 0 of the vertical deflection device 1 are of the same construction and are constructed as shown in FIGS. 2 to 5, respectively.6 As is most obvious from FIG. body J2
is a suffix conductor made of, for example, a metal plate; a j-th dielectric body @ 12a disposed on one main surface side of 3; and a ground conductor 13;
and a second dielectric plate 12h disposed on the other main surface side of the ground conductor J3. The first and second dielectric plates 32a and 12b are each made of an alumina plate and are bonded to each other with an adhesive (not shown). The dielectric plates 12a, 12b may be made of another dielectric such as quartz glass.

The helical conductor 1 is constructed by winding a metal band around the surface of a dielectric material 2 having a rectangular cross-section and attaching it thereto. To explain this helical conductor 1 in more detail, the first surface portion 1 provided on the surface of the dielectric 2 opposite to the tube axis.
1a and the @2 surface portion 11h provided on the opposite surface of the dielectric J2, and the first and second side portions 11c connecting these.

11d. The relative position of the helical conductor [] with respect to the ground conductor 13 is determined by the thickness of the dielectric plates 12a and 12b. Therefore, a spiral conductor with desired dimensions can be easily and accurately produced. Furthermore, the gap between the manufacturer's helical conductor [] and the ground conductor 13 does not vary.

The facing interval between the first portion 9 and the second portion 0 of the deflection device 1 becomes narrower toward the electron gun as shown in FIG. 1 in order to increase the deflection sensitivity. Therefore, the first
and second part9. The capacitance per unit area between the helical conductors of 0 and 0 increases as it moves toward the electron gun. In this embodiment, in order to compensate for this change in capacitance per unit area and make the 1% impedance uniform.

The width of the spiral conductor] becomes narrower as it advances toward the electron gun.1,8. This uniformity of characteristic impedance is
This can also be achieved by increasing the thickness of the dielectric 12 toward the electron gun.

Since the distributed capacitance at the opposing surface part KM of the helical conductor is larger than the distributed capacitance at the non-opposing surface part, the thickness of the first dielectric plate 12a on the opposing surface side is reduced by the thickness of the second dielectric plate 12b.
By making the capacitance thicker than the thickness of the capacitor, the distributed capacitance is made uniform. In addition.

This uniformity of the distributed capacitance is achieved by km of the first dielectric plate 12a.
This can also be achieved by reducing the ratio, or by narrowing the width of the opposite surface of the spiral conductor J.

The characteristic impedance of a signal transmission line based on J is the inductance of a helical conductor.

It is decided by the distributed capacitance between the helical conductor ]] and the ground conductor ]3. In this example, a helical conductor]1 and a ground conductor1
Since the dielectric plates 12a and 12h are continuously interposed between the electrodes 3 and 3, the uniformity of the % impedance is good. Therefore, the traveling speed of the deflection electric field C (deflection signal) is made uniform, and the movement of the deflection electric field (deflection signal) is well synchronized with the movement of the electron beam, making it possible to observe the frequency signal.

Next, a deflection device according to another embodiment of the present invention shown in FIGS. 6, 7, and 8 will be described. , 6 and 7 show only a portion of the portion corresponding to the first portion 9 of the deflection device shown in FIG. 1.

This deflection device is refined using a multilayer circuit board.

The ground conductor 20 is connected to the first and second dielectric layers 21°220
5 first and second dielectric layers embedded in 2),
The strip-shaped conductors 24 and 25 on one and the other main surfaces 23a and 23b of the dielectric body 23 having a rectangular cross-sectional shape consisting of 22 are formed into spiral shapes by etching gold mm that has been previously formed on the entire surface. There is. Amphibian surfaces 23a, 23b
The strip-shaped conductors 24, 25 are interconnected by a connecting conductor 27 in a through hole 26 extending from one main surface 23a to the other main surface 23b. Due to this.

A deflection device is obtained in which the ground conductor 20 is surrounded by a spiral consisting of strip conductors 24, 25 and connecting conductors 27. 6th
Although only a part of the deflection device is shown in FIGS.
If you want to create a deflection device.

Figure 6 Same as Figures 1 to 8 - prepare another one from the accident,
Even in the embodiments shown in FIGS. 6 to 8, in which the conductors 24 and 25 are arranged opposite to each other in FIG.

Further, the thicknesses of the first and second dielectric layers 2 and 22 may be different.

A deflection device according to still another embodiment of the present invention shown in FIGS. 9 to 12 has an alumina substrate t-1! A strip conductor 33.3 is attached to the first and second dielectric plates 31, 32 made of
4 and grounding conductor 35 of 8 digits are prepared in advance, and as shown in FIG.
6 is used to electrically connect one strip-shaped conductor 33 and the other strip-shaped conductor 34. Since the one strip-shaped conductor 33 and the other strip-shaped conductor 34 are inclined in opposite directions, a spiral conductor can be obtained by connecting their ends with the connecting member 36. In addition.

The strip conductors 33, 34 and the ground conductor 35 can be easily formed by printing, steaming, plating, or the like.

Furthermore, the widths of the four bodies 33 and 34 and the thicknesses of the dielectric plates 3] and 32 may be changed according to changes in position, as in the case of FIGS. 11W to 5.

The invention is not limited to the embodiments described above.

For example, the following transformation is possible.

+11 Dielectric] 2. Enzyme layer 23. Attractant plate 3].

32 may be made of quartz glass.

(2) Accumulation 'gjK with accumulation tarkerat instead of fluorescent screen 60 is also a common OJ fir.

[Efficacy of invention]

As is clear from the above, one aspect of the present invention is a wideband CRT.
A deflection device for use can be easily constructed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the principle of C) IT according to an embodiment of the present invention. 2 is a plan view showing a half of the deflection device of FIG. 1; FIG. FIG. 3 is a normal rjIJ diagram of the deflection device of FIG. 2. FIG. 4 is a side view of the deflection device of FIG. 3, and FIG. 5 is a cross-sectional view of a portion corresponding to the v-v line of FIG. 1. The sixth core is a plan view showing a part of a deflection device according to another embodiment of the present invention. No. 79 is a front view of the deflection device of the sixth prisoner. FIG. 8 is a cross-sectional view of the deflection device shown in FIG. 7. FIGS. 9, 10, and 11 are perspective views respectively showing members to be picked up by the deflection device 1 according to still another embodiment of the present invention. FIG. 12 is a partially enlarged cross-sectional view of the deflection device taken out of the members shown in FIGS. 9-12. ]... Deflection device, 9... First part, ]0... Second part, 1]... Spiral conductor, ]2... Dielectric material,
13-6. ground conductor. Agent Nori Takano Figure 6 Figure 7

Claims (1)

[Claims] (1) a pair of conductive grounding members arranged oppositely along the electron beam path; a pair of dielectrics each surrounding and mechanically supporting the pair of conductive grounding members; and the pair of dielectrics. a first surface portion provided on opposing surfaces of the body, a second surface portion provided on a surface opposite to the opposing surface, and a portion connecting the first and second surface portions, respectively; An electron beam deflection device comprising a pair of spiral conductors consisting of: