Abstract: The present invention provides an emitter structure of a field emission electron gun. The emitter structure comprises an emitter being electrically conductive and being pointed at the top, wherein the top of the emitter has the highest resistance of every other part, so that the top of the emitter has the highest heat energy of every other part when the emitter emits electrons.

Abstract: An electron emitter plate (110) for an FED image display has an extraction (gate) electrode (122, 222) spaced by a dielectric insulating layer (25) from a cathode electrode including a conductive mesh (118, 218). Circular arrays (112) of microtips (14) are located concentrically within mesh spacings (116, 216) on a resistive layer (15), within apertures (26) formed on ring-shaped pads (127, 227) patterned in an extraction electrode (122). Mesh spacings (116) and pads (127) are circular. Mesh spacings (226) and pads (227) are hexagonal. For reduced capacitance, dielectric material (25) is etched from cores (144) of rings (127, 227) and from toroidal regions (148) below rings (127, 227). Mesh spacings (116, 216) are hexagonal close-packed and mesh material (118, 218) is removed from portions (142) of cathode electrode. Y-shaped bridging strips (129') have nodes (146) located over removed cathode electrode portions (142).

Abstract: The present invention is directed to an antireflection film having a multilayer structure in which an antireflection multi-layer film including at least two thin films is formed on a substrate, wherein at least one of the thin films contains a coloring agent. The antireflection multi-layer film absorbs light of an entire range of wavelength of 400-700 nm, and the reflectance of the antireflection multi-layer film with regard to the wavelength, light of which this antireflection multi-layer film can absorb, is smaller than the reflectance of the substrate. The antireflection film can be applied to a cathode ray tube or a light-transmitting display substrate of a display apparatus such as a liquid crystal display apparatus for the purpose of effectively avoiding reflection of external light.

Abstract: The vertical deflection coil of a deflection yoke is wound by repeating the process that a main winding is realized by wire wound from the one end to the central portion of each core, wire which returns back at once from the central portion to the other end of the core, is wound along the outer circumferential surface of the core. The main winding is realized by the wire wound from the other end to the central portion of the core, and the wire that returns back at once from the central portion to the one end is wound along the outer circumferential surface of the core. Therefore, the distortion of a vertical deflection magnetic field is prevented.

Abstract: Spatial NMR information is obtained from a sample by applying a magnetic field having a static component and two orthogonal periodically-varying gradient components. A recurring cycle of rf excitation pulses is applied. One of the gradient components is reduced in amplitude from its maximum to zero over a period and the other gradient component is subsequently increased from zero to its maximum over a period. The said periods are both longer than the cycle time.

Abstract: A resonator which is arranged on a hollow cylindrical support (1) for the taking of high resolution magnetic nuclear resonance spectra from a sample extending along the cylinder axis within the resonator, and having a shielding (2) which defines the sensitive region of the resonator axially along a certain length which is shorter than the axial extent of the support (1), is characterized in that the resonator is configured as an axially symmetric bird-cage resonator. It only produces static field distortions in its sensitive region which are easily correctable, has an improved fill-factor and reduced ohmic losses, and produces a homogeneous RF field while avoiding topological problems occurring with quadrature detection.

Abstract: An incandescent lamp and method of making includes the placement of a hollow annular glass cylindrical insert within the glass envelope before fusing of the envelope to the bead takes place. The cylindrical insert is preferably made of an alumino silicate glass which has melting temperature about 200.degree. C. higher than the melting temperature of the glass from which the glass envelope is made. The shaping and length of the hollow annular glass cylinder may be made to accommodate the shaping of the lens portion of the glass envelope. The higher melting temperature of the hollow annular glass cylinder will enable it to provide support to the glass envelope during the fusing process. The hollow annular glass cylinder will not enable the glass envelope to tilt to one side or the other, or to become compressed, bringing the lens portion closer to the filament, especially during the fusing operation when the final lamp is formed.

Abstract: The present invention relates to an ion-optical system for a gas-discharge ion source, the system comprising a screen grid and an accelerator grid each constituted by a respective frame and a set of wires held parallel by supports and fixed to said frames by means of springs, the frames and the grids being assembled together by means of insulators to which they are fixed. According to the invention, the system further comprises a decelerator grid constituted by a frame and a set of wires, the frame of the decelerator grid being engaged in the frame of the accelerator grid and being separated therefrom by insulators. The supports of the wires are constituted either by a comb-shaped plate or by rollers with at least one of the rollers installed in the screen grid being shaped so as to be barrel-shaped, having a larger diameter in its center than at its ends.

Abstract: An MR imaging apparatus using NMR phenomenon includes a main magnet for generating a uniform static magnetic field in an imaging space, a first to a third gradient field coils, an RF coil for emitting an excitation RF pulse and a plurality of refocus RF pulses and detecting echo signals, an RF emitter for modulating and emitting the excitation RF pulse and refocus RF pulses with predetermined timing through the RF coil, and a slice-selecting gradient field pulse generator. A phase-encoding gradient field pules generator and a reading gradient field pulse generator are provided, along with a data collector for detecting, with a predetermined frequency (reference frequency), the echo signals detected by the RF coil, and collecting data therefrom. A phase detector determines phase differences of echo peaks in the echo signals with respect to the reference frequency, respectively.

Abstract: A nuclear magnetic resonance probe is provided comprising a high frequency resonator (14, 16) having a resonant frequency, a first coaxial conductor (20) connected to the high frequency resonator, and a high frequency supply which supplies the first coaxial conductor (20) the resonant frequency of the high frequency resonator (14, 16). The high frequency supply includes a conductive sampling loop (40) at least partly placed in the high frequency resonator (14, 16) and a broad band, high frequency, amplifier (56) having an input (E) connected to the sampling loop (40) by a second coaxial conductor (50) and an output (S) connected to the first coaxial conductor (20). The assembly forming a high frequency loop oscillator locked to the resonant frequency of the high frequency resonator (14, 16).

Abstract: A magnetic resonance method is utilized for taking an image of an object. An initial projection is taken by applying a gradient magnetic field having a predetermined direction .phi. and strength G, irradiating a high frequency excitation pulse and sequentially measuring a nuclear resonance signal from the object. The signal dephases under the influence of the gradient magnetic field and the signal measuring points are assigned to points in k-space lying along a vector whose direction is determined by the direction .phi. of the gradient magnetic field, and whose magnitude by the product of the strength of the gradient magnetic field and the time interval between the excitation pulse and the taking of the corresponding measuring point. A further number of n-1 (n>>1) projections are obtained by changing the direction and/or strength of the gradient magnetic field. Additional excitations and measurements are carried out for an additional n'.ltoreq.n projections having measuring points.

Abstract: An SLP pulse is applied to an object to be imaged preceding one or more excitation pulses (a.sup.o or a) of a known magnetic resonance imaging technique. The SLP pulse tilts the nuclear magnetization away from the direction of B.sub.o, locks the magnetization with the rotating magnetic component and returns the magnetization back to the direction of B.sub.o. The known magnetic resonance imaging technique used with the SLP pulse includes applying at least one excitation pulse to generate transverse magnetization in the object. The excitation pulse causes the angle between the nuclear magnetization and B.sub.o to be less than 90.degree..