摘要:
A vacuum ionization gauge (30) includes a cathode (31), an anode ring (33), a shield electrode (32), an ion educed electrode (34), a reflector (35) and a collector (36). The cathode is positioned corresponding to a first opening of the shield electrode, and the ion educed electrode is positioned corresponding to an opposite second opening of the shield electrode. An ion educed hole (341) is defined in a middle of the ion educed electrode. The reflector has a curving surface generally surrounding the second opening of the shield electrode. The collector is positioned at a center of the curving surface of the reflector and points toward the ion educed hole. The anode ring is positioned in the middle of the shield electrode. The vacuum ionization gauge is small volume and has low power consumption and improved sensitivity.
摘要:
A light source apparatus (8) includes a rear plate (80), a front plate (89) formed with an anode layer (82), and a cathode (81) interposed therebetween. The cathode includes a plurality of electrically conductive carriers (812) and a plurality of field emitters (816) formed thereon. The field emitters are uniformly distributed on anode-facing surfaces of the conductive carriers. The anode layer includes a plurality of curving portions (820) corresponding to the conductive carriers. Preferably, the field emitters extend radially outwardly from the corresponding conductive carriers. The conductive carriers are parallel with each other, and are located substantially on a common plane. Each of the conductive carriers can be connected with a pulling device arranged at least one end thereof, and an example of the pulling device is a spring. The conductive carriers may be cylindrical, prism-shaped or polyhedral.
摘要:
An emitter includes an electrode, and a number of carbon nanotubes fixed on the electrode. The carbon nanotubes each have a first end and a second end. The first end is electrically connected to the substrate and the second end has a needle-shaped tip. Two second ends of carbon nanotubes have a larger distance therebetween than that of the first ends thereof, which is advantageous for a better screening affection. Moreover, the needle-shaped tip of the second ends of the carbon nanotube has a lower size and higher aspect ratio than the conventional carbon nanotube, which, therefore, is attributed to bear a larger emission current.
摘要:
A field emission display includes a field emission cathode and an anode electrode plate arranged above the field emission cathode. The filed emission cathode includes a substrate, and a plurality of electron-emitting areas spaced apart from each other and arranged on the substrate. Each of the electron-emitting areas includes a cathode, a gate electrode, and a number of first and second conductive lines. The cathode includes a first conductive substrate and a first carbon nanotube assembly having a plurality of carbon nanotubes each having a cathode emitting end having a needle-shaped tip. The gate electrode is faced to the cathode emitting end. The taper-shaped tips of the cathode emitting ends and the gate have a small size and higher aspect ratio, allowing them to bear a larger emission current at a lower voltage.
摘要:
An exemplary electron emission device includes an electron emitter, an anode opposite to and spaced apart from the electron emitter, a first power supply circuit, and a second power supply circuit. The first power supply circuit is configured for electrically connecting the electron emitter and the anode with a power supply to generate an electric field between the electron emitter and the anode. The second power supply circuit is configured for electrically connecting the electron emitter with a power supply to supply a heating current for heating the electron emitter whereby electrons emit therefrom. Methods for generating an emission current with a relatively higher stability also are provided.
摘要:
An emitter includes an electrode, and a number of carbon nanotubes fixed on the electrode. The carbon nanotubes each have a first end and a second end. The first end is electrically connected to the substrate and the second end has a needle-shaped tip. Two second ends of carbon nanotubes have a larger distance therebetween than that of the first ends thereof, which is advantageous for a better screening affection. Moreover, the needle-shaped tip of the second ends of the carbon nanotube has a lower size and higher aspect ratio than the conventional carbon nanotube, which, therefore, is attributed to bear a larger emission current.
摘要:
A vacuum ionization gauge (30) includes a cathode (31), an anode ring (33), a shield electrode (32), an ion educed electrode (34), a reflector (35) and a collector (36). The cathode is positioned corresponding to a first opening of the shield electrode, and the ion educed electrode is positioned corresponding to an opposite second opening of the shield electrode. An ion educed hole (341) is defined in a middle of the ion educed electrode. The reflector has a curving surface generally surrounding the second opening of the shield electrode. The collector is positioned at a center of the curving surface of the reflector and points toward the ion educed hole. The anode ring is positioned in the middle of the shield electrode. The vacuum ionization gauge is small volume and has low power consumption and improved sensitivity.
摘要:
A field emission lamp (30) includes a tube (31) having a closed end and an open end, an encapsulation board (38) mated with the open end, an anode layer (32) formed on an inner surface, a fluorescence layer (33) formed on the anode layer, a cathode down-lead pole (342) located at the encapsulation board, a cathode fixing pole (341) located at the closed end, a cathode filament (34) having a carbon nanotube layer formed on a surface thereof fixed between the cathode down-lead pole and the cathode fixing pole, an anode down-lead ring (321) located at the anode layer near the open end, and an anode down-lead pole (322) located at the encapsulation board and electrically connected with the anode down-lead ring. The field emission lamp has a simple structure, thereby having an enhanced production rate and a reduced cost.
摘要:
A cold cathode device (20) includes a grid (24), a cold cathode (21) positioned under the grid, and a shield electrode (26) positioned above and parallel to the grid. A vacuum gauge includes a shell (32), a collector (39), an anode (38), and the cold cathode device of the present invention. The cold cathode device and the collector are positioned symmetrically relative to the anode. The collector, the grid and the cold cathode device are received in the shell. The shield electrode can shield an electric field of the grid for preventing from disturbing a symmetrical saddle field in the vacuum gauge. Electrons produced by the cold cathode device can obtain a long electron track because the electron vibration in the saddle field is symmetrical. Thus, the vacuum gauge has an improved sensitivity, and can be widely used to measure pressure in ultra-high and extremely high vacuum conditions.
摘要:
A light source apparatus (8) includes a rear plate (80), a front plate (89) formed with an anode layer (82), and a cathode (81) interposed therebetween. The cathode includes a plurality of electrically conductive carriers (812) and a plurality of field emitters (816) formed thereon. The field emitters are uniformly distributed on anode-facing surfaces of the conductive carriers. The anode layer includes a plurality of curving portions (820) corresponding to the conductive carriers. Preferably, the field emitters extend radially outwardly from the corresponding conductive carriers. The conductive carriers are parallel with each other, and are located substantially on a common plane. Each of the conductive carriers can be connected with a pulling device arranged at least one end thereof, and an example of the pulling device is a spring. The conductive carriers may be cylindrical, prism-shaped or polyhedral.