JPS5837657B2 - Broadband electron beam deflection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electron beam deflection device, and more particularly to a broadband electron beam deflection device using a helical deflection structure.

A broadband electron beam deflection device with a slow wave structure conventionally used in cathode ray tubes for oscilloscopes is disclosed in Japanese Patent Publication No. 16697/1983.
It is disclosed in US Pat. No. 3,694,689 and the like.

All of these typically involve fixing a conductive helical deflection structure to a glass or ceramic rod using a plurality of conductive pins at a point farthest from the electron beam deflection surface.

Therefore, in order to obtain stable operating characteristics, the spiral deflection structure must be fabricated and installed with extremely high precision using a material with sufficient strength, and the disadvantage is that deflection distortion occurs due to the conductive pins. There is.

The present invention has been made in order to eliminate the drawbacks of the prior art, and uses a plurality of dielectric support members without using conductive pins, and moreover, the back surface of the deflection part of the spiral deflection structure is It is an object of the present invention to provide a broadband electron beam deflection device which has high dimensional accuracy and whose operation is extremely stable against vibrations, shocks, etc. even when using materials with excellent workability by directly supporting the device.

A broadband electron beam deflection device according to the present invention includes two deflection structures disposed substantially in parallel along an electron beam path, in which at least one of the deflection structures includes a conductive plate-like member with a cross section of approximately A plurality of dielectrics are wound in a rectangular spiral and have a plurality of electron beam deflection sections parallel to each other along the electron beam path, and the back surface of the deflection section of the spiral deflection structure is arranged approximately at right angles to the electron beam path. The spiral deflection structure is directly fixed to the body support member to support the helical deflection structure.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a side view of an embodiment of a deflection device according to the present invention, and FIG. 2 is an enlarged perspective view of the portion surrounded by a broken line in FIG.

22 and 23 are deflection structures disposed substantially parallel to each other along the path of the electron beam 26, each of which is formed by winding a conductive plate-like member in a spiral shape with a substantially rectangular cross section to form a delay line. A plurality of flat electron beam deflectors 22a and 22b are parallel to each other and face each other at a predetermined interval along the path.
A balanced deflection device is constructed by forming .

A deflection electric field with desired sensitivity and scanning is formed in the gap between the plurality of electron beam deflectors 22a and 22b, and the electron beam traveling through the gap is deflected by this electric field.

Also, the impedance of the deflection structures 22, 230 is set to match the deflection amplifier driving them.

Reference numeral 19 denotes a plurality of columnar dielectric support members disposed approximately perpendicular to the path of the electron beam 26, one end of each of which is embedded in the glass rods 20 and 21, and the other end of each dielectric support member arranged perpendicularly to the path of the electron beam 26. The electron beam 26 of each deflection section 22a, 22b
Each deflection structure 22, 23 is directly fixed (using an adhesive such as brass solder, epoxy resin, or by electroplating) at a point 21 closest to the electron beam on the back surface opposite to the passage. is supported.

Each deflection structure 22, 23 is arranged between a pair of deflection body end supports 24, 25.

Such end supports 24,25 are connected to glass rods 20,2.
1 by a known method, and has a suitable opening for the electron beam to pass through.

Incidentally, one of the deflection structures 22 and 23 may be constituted by a flat conductive ground plate facing parallel to the deflection portion of the other spiral deflection structure.

Further, the glass ronds 20, 21 may be arranged so as to be located within the spiral tunnels of the deflection structures 22, 23.
It is easier to assemble if it is placed outside.

Further, the dielectric support member 19 has deflection portions 22 arranged at predetermined intervals.
It may be fixed to a and 22b.

According to the present invention described above, there are the following advantages.

Since the back surface of the electron beam deflection section of at least one of the pair of deflection structures, on the opposite side of the electron beam path, is directly fixed to and supported by the dielectric support member, unnecessary signal radiation is eliminated. , it is possible to mechanically firmly support the helical deflection structure without disturbing the deflection electric field.

Therefore, we have created a broadband electron beam deflection device that has high dimensional accuracy and is extremely stable in operation against vibrations and shocks even when using materials with excellent workability, and is capable of reliably deflecting even ultra-high frequency signals without distortion. Obtainable.

Also, because the dielectric support member has a low dielectric constant, there is little risk of significant local changes in the deflection structure zero impedance, increased forward coupling along the deflection structure, and significant radiation.

Thus, the deflection device according to the present invention is particularly suitable for application to high performance CRTs.

The preferred embodiments of the present invention have been described above, and it will be obvious to those skilled in the art that modifications and changes can be made without departing from the gist of the present invention.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of a broadband electron beam deflection device according to the present invention, and FIG. 2 is an enlarged perspective view of a portion surrounded by a broken line in FIG. 19 is a dielectric support member, 20.21 is a glass rond, 2
2. 23 is a deflection structure, 22a and 23a are electron beam deflection sections, and 26 is an electron beam.

Claims (1)

[Claims] 1. In an electron beam deflection device including two deflection structures disposed substantially parallel to each other along an electron beam path, at least one of the deflection structures includes a conductive plate member wound spirally with a substantially rectangular cross section. The spiral deflection structure has a plurality of electron beam deflection sections parallel to each other along the electron beam path, and the back surface of the deflection section of the spiral deflection structure is connected to a plurality of dielectric support members disposed substantially perpendicular to the electron beam path. A broadband electron beam deflection device, characterized in that the spiral deflection structure is directly fixed to support the above-mentioned spiral deflection structure.