摘要:
An improved microelectromechanical device includes an upper plate, a lower plate, and a spacing structure. The upper plate includes a first surface and an opposite second surface. The lower plate is spaced from the upper plate. The lower plate includes a third surface that faces the first surface of the upper plate and a fourth surface that is opposite of the third surface. The lower plate also includes a series of structures disposed with the third surface of the lower plate. The spacing structure is coupled to the upper and lower plate. The spacing structure includes a base portion that is sealed to the first surface of the upper plate and the third surface of the lower plate. The spacing structure further includes a protrusion that extends from the base portion between the upper and lower plates.
摘要:
Embodiments of the disclosure relate to electron emitters for use in conjunction with X-ray emitting devices. In certain embodiments the emitter includes features that prevent, limit, or control deflection of the electron emitter at operating temperatures. In this manner, the electron emitter may be kept substantially flat or at a desired curvature during operation.
摘要:
In a device for generating X-rays or electron beams the cathode of the device is mounted on a ceramic insulator which becomes hot during operation, and the ceramic insulator is cooled by a fluid coolant flowing around the outside of the insulator at the remote end of the insulator, away from the cathode. The coolant conduit can be formed by flange rings, soldered directly on to the surface of the insulator, and the conduit may be shaped such that the coolant is in direct contact with the insulator. A method for manufacturing the de ice is also described.
摘要:
A photocathode system includes a plurality of photocathodes, and at least one combining device. The photocathodes have individually adjustable voltages, and each photocathode generates an individual electron bunch at an emission period. The combining device combines the individual electron bunches, generated at each emission period, into a combined bunch along a combined axis. The timing of the individual electron bunches is independently adjustable, so that an electron bunch with a lower energy arrives at the combined axis earlier in time compared to another electron bunch with a higher energy, thereby allowing the combined beam of electron bunches to be longitudinally compressed. The photocathodes may be distributed along a 1D column, or a 2D array, or a 3D array, or any arbitrary configuration. A linac is located near a longitudinal focusing point to boost beam energy and therefore freeze bunch length and emittance.
摘要:
Cathode structure for cathode ray tube comprising an eyelet in two separate parts positioned such that one of the parts covers, in the longitudinal direction and at least partially, the second part. The two parts are linked to each other at the shouldered ends.This structure reduces the heat losses of the cathode and reduces its consumption while it is operating.
摘要:
An optical structure enabling properties of the surface plasmons to be used is defined from a substantially binary, parameterizable unit pattern ME. The parameters a, b, c, d and hg of the pattern are chosen so as to maximize the complex amplitudes of the first two harmonics of the complex Fourier series describing the pattern ME. This structure is advantageously used in combination with a photodetector, an infrared or Terahertz optical wave emitter, or a field emission device.
摘要翻译:使用能够使用表面等离子体激元的特性的光学结构由基本上二进制的,可参数化的单元图案M E SMALLCAPS>定义。 选择图案的参数a,b,c,d和h g,以使得描述模式M E的复数傅里叶级数的前两个谐波的复振幅最大化, / SMALLCAPS>。 该结构有利地与光电检测器,红外或太赫兹光波发射器或场致发射器件组合使用。
摘要:
An electronic transmitter or receiver employing electromagnetic radiation as a coded signal carrier is described. In the transmitter, the electromagnetic radiation is emitted from ultra-small resonant structures when an electron beam passes proximate the structures. In the receiver, the electron beam passes near ultra-small resonant structures and is altered in path or velocity by the effect of the electromagnetic radiation on structures. The electron beam is accelerated to an appropriate current density without the use of a high power supply. Instead, a sequence of low power levels is supplied to a sequence of anodes in the electron beam path. The electron beam is thereby accelerated to a desired current density appropriate for the transmitter or receiver application without the need for a high-level power source.
摘要:
A phosphor screen is formed on an inner surface of a face portion whose outer surface is substantially flat. A shadow mask faces the phosphor screen. The shadow mask includes a perforated portion having a plurality of apertures, a non-perforated portion formed on a periphery of the perforated portion and a skirt portion formed on a periphery of the non-perforated portion. The non-perforated portion includes a pair of longer side portions each having an outer bead and an inner bead that are adjacent to each other and a pair of shorter side portions each having the outer bead and an inner bead that are adjacent to each other. In each of the pair of longer side portions, the spacing between the outer bead and the inner bead is at least 2 mm. This makes it possible to suppress wavy wrinkles generated in the perforated portion, so that the image quality of a color picture tube can be improved.
摘要:
A color cathode-ray tube apparatus having: a glass bulb including a face panel, a funnel, and a neck; a deflection yoke attached to the funnel to surround thereof; and a color-selection electrode disposed inside the face panel. A pair of degaussing coils are wound around the upper and lower portions of the glass bulb, respectively. A loop coil, which is disposed around the glass bulb between the color-selection electrode and the deflection yoke, includes: a first portion including two extending portions of the loop coil positioned over and below the glass bulb respectively, each center of the extending portions being substantially in a plane perpendicular to a tube axial of the glass bulb; and a second portion including two bent portions that are formed by bending right and left sides of an original form of the loop coil toward the neck.
摘要:
A picture display device comprises a cathode ray tube (1) with an elongated display screen (8) and a deflection system (9) for deflecting electron beams. The display screen is substantially rectangular with a long and a short axis. The line scanning direction is parallel to the long axis of the display screen. The cathode ray tube comprises a neck portion and between the screen and the neck portion a cone portion (3, 3a). This cone portion has an aspect ratio (ratio of x and y dimension, x/y ratio), which is near the neck below unity and changes to above unity closer to the screen as a function of z.