Abstract:
A cathode ray tube (400) comprising an electron source and an extraction electrode (140) provided with an electrode aperture (170). The extraction electrode (140) is arranged to produce an electric field so as to effect the transport of electrons from said electron source and through said electrode aperture (170). Furthermore, the cathode ray tube (400) comprises an aperture electrode (150) located between said extraction electrode (140) and the electron source. The aperture electrode (150) comprises an aperture region (180) provided with a plurality of apertures (190), each aperture of said plurality of apertures (190) being shaped such that an electron beam with a beam current in a predetermined range of beam currents is formed at low drive voltage so that the cathode ray tube has a desired gamma value.
Abstract:
PROBLEM TO BE SOLVED: To provide a multi-beam electron gun which generates a plurality of electron beams which are matched in characteristics. SOLUTION: The multi-beam electron gun 2 is composed of a plurality of electron guns 2a to 2c. The electron gun 2a is equipped with an electron source 21a, a Wehnelt electrode 22a, an anode electrode 23, and furthermore, a shield electrode 24 interposed between the Wehnelt electrode 22a and the anode electrode 23. The shield electrode 24 is capable of reducing electric field interference between the electron guns. COPYRIGHT: (C)2004,JPO
Abstract:
The invention relates to a cathode arrangement (20) comprising: • - a thermionic cathode comprising an emission portion (30) provided with an emission surface for emitting electrons, and a reservoir (38) for holding a material, wherein the material, when heated, releases work function lowering particles that diffuse towards the emission portion and emanate at the emission surface at a first evaporation rate; • - a focusing electrode (40) comprising a focusing surface for focusing the electrons emitted from the emission surface of the cathode; and • - an adjustable heat source (50) configured for keeping the focusing surface at a temperature at which accumulation of work function lowering particles on the focusing surface is prevented.
Abstract:
One embodiment relates to an electron beam apparatus which includes a dual-lens electron gun for emitting an electron beam. The electron beam is a high beam-current electron beam in a first operating mode and a low beam-current electron beam in a second operating mode. The apparatus further includes a column aperture which is out of the path of the high beam-current electron beam in the first operating mode and is centered about an optical axis of the electron beam apparatus in the second operating mode. Another embodiment relates to an electron gun which includes a first gun lens, a beam limiting aperture, and a second gun lens. The first gun lens focuses the electrons before they pass through the beam-limiting aperture while the second gun lens focuses the electrons after they pass through the beam-limiting aperture. Other embodiments, aspects and features are also disclosed.
Abstract:
One embodiment disclosed relates to an electron source for generating an electron beam. The electron source includes an electron emitter having a tip from which an electron beam is extracted. The electron further includes a non-planar extractor with an extractor opening and a built-in beam-limiting aperture. The extractor opening is larger than the beam-limiting aperture, and central axes of both the extractor opening and the beam-limiting aperture are aligned with the tip along a beam axis. Another embodiment relates to a method of generating an electron beam using an electron source having a non-planar extractor. Another embodiment relates to an array of electron sources for generating an array of electron beams. The array of electron sources includes an array of electron emitters and an array of non-planar extractor structures. Other embodiments, aspects and features are also disclosed.
Abstract:
A cold-cathode electron source having an improved use efficiency of an electron beam and a simple structure. The cold-cathode electron source comprises a gate electrode (4) provided on a substrate (2) through an insulating layer (3) and an emitter (6) extending through the insulating layer (3) and the gate electrode (4) and disposed in an opening of the gate. During the emission of electrons from the emitter (6), the relationships are satisfied: 10 [V/ mu m] > (Va-Vg) / (Ha-Hg) > Vg / VaVg / Hg [V/ mu m] > VaX10 X (9.7-1.3 X ln(Hg)) X (1000/Ha) where Ha [ mu m] is the distance between the anode and emitter, Va [V] is the voltage between the anode and emitter, Hg [ mu m] the distance between the gate and emitter, and Vg [ mu m] is the voltage between the gate and emitter.
Abstract:
The invention relates to a cathode arrangement (20) comprising: a cathode body housing an emission surface (32) for emitting electrons in a longitudinal direction (Z), wherein the emission surface is bounded by an emission perimeter (35); a focusing electrode (40) at least partially enclosing the cathode body in a transversal direction and comprising an electron transmission aperture (44) for focusing the electrons emitted by the emission surface, wherein the aperture is bounded by an aperture perimeter (45), wherein the cathode body is moveably arranged within the focusing electrode over a maximum transversal distance (d1) from an aligned position (R0), and wherein the aperture perimeter transversally extends over the emission surface and beyond the emission perimeter over an overlap distance (d2) that exceeds the maximum transversal distance.
Abstract:
A gun with a cold cathode is disclosed in the present invention. A cold cathode made of a material for a cold cathode is held on a base, a mesh gate is right over the cold cathode, a focusing electrode in a circular hole-shape is right over the mesh gate, and the above-described electrodes are insulated with each other and held on the base. A mesh shielding electrode may be also provided right over the focusing electrode and is fixed on the base by a support for the shielding electrode. Depending on circumstances, the shielding electrode is required in a smaller device such as a pixel tube, but is not required in the applicattion of a cold lamp. The gun with a cold cathode according to the present invention is simple in structure, excellent in performance, and mainly used for a electron source, a electrical lamp with a cold cathode, and a pixel tube, it may be also used for other circumstances having the require similar to that.