摘要:
Since a ZnTe-base compound semiconductor crystal was designed so as to have, on a ZnTe-base compound semiconductor layer, an n-type contact layer which includes a superlattice layer having n-type CdSe and n-type ZnTe grown with each other or a ZnCdSeTe-graded layer, it was made possible to raise carrier concentration of the n-type contact layer, and to control the conductivity type in a relatively easy manner. Moreover, formation of a CdSe/ZnTe superlattice layer or a ZnCdSeTe-graded layer between the contact layer and an electrode can prevent electric resistance from being increased due to difference in the energy gaps. Since CdSe and ZnTe, composing the CdSe/ZnTe superlattice or ZnCdSeTe composition-graded layer, have relatively close lattice constants, formation thereof is less likely to adversely affect the crystallinity of the semiconductor crystal, which is advantageous in obtaining the semiconductor crystal with an excellent quality.
摘要:
The present invention relates to a II-VI compound semiconductor crystal comprising an n-type contact layer which includes a superlattice layer comprising n-type CdSe and n-type ZnTe stacked with each other, on a ZnTe-base compound semiconductor layer; a A II-VI compound semiconductor crystal comprising an n-type contact layer which includes an n-type ZnCdSeTe composition-graded layer in which composition of Zn, Cd, Se and Te is gradually varies, on a ZnTe-base compound semiconductor layer; a II-VI compound semiconductor crystal comprising a p-type contact layer which includes a superlattice layer comprising p-type CdSe and p-type ZnTe stacked with each other, on a CdSe-base compound semiconductor layer; and a II-VI compound semiconductor crystal comprising a p-type contact layer which includes a p-type ZnCdSeTe composition-graded layer in which composition of Zn, Cd, Se and Te is gradually varied, on a CdSe-base compound semiconductor layer.
摘要:
A surface-conductive electron beam source having a fine particle film which is formed by repeating a film formation step of applying and calcining an organic metal compound solution several times. A pair of electrodes come in contact with the fine particle film, and an electron-emitting portion is formed at a part of the fine particle film. There is also a display device having the electron beam source, a modulation means for modulating an electron beam emitted from the electron beam source in accordance with an information signal, and an image-forming member for forming an image by the irradiation of the electron beam.
摘要:
A radiation generating apparatus includes: an envelope 1 having a first window 2 through which a radiation is transmitted; and a radiation tube 10 being held within the envelope 1, and having a second window 15 which is arranged in opposition to the first window 2, and through which the radiation is transmitted; and a radiation shielding member 16 thermally connected to the second window 15, having a radiation transmitting hole 21 arranged in communication with the second window 15, and having a protruding portion protruding from the second window 15 toward the first window 2. A thermally conductive member 17 having a higher thermal conductivity rather than that of the radiation shielding member 16 is connected to the protruding portion of the radiation shielding member 16. The radiation generating apparatus can shield an unnecessary radiation and cool a target with a simple structure and is entirely reduced in weight.
摘要:
A radiation generating tube 1 includes: an electron emitting source 3; a target 9 spaced from the electron emitting source 3, for generating radiation 11 responsive to irradiation with an electron beam from the electron emitting source 3; and a tubular shielding member 10 having an electron passing hole 8, wherein the electron passing hole 8 has an electron incident aperture at one end thereof and has a target supporting surface 9b supporting the target 9 at the other end thereof, wherein the target supporting surface 9b is connected through a brazing filler 14 to a periphery of a surface of the target at a side on which the electron is incident, and an opening size of the other end of the electron passing hole 8 is larger than an opening size of the electron incident aperture at the one end thereof.
摘要:
A radioactive ray generating apparatus includes a second shielding member, a target, and a first shielding member, which are sequentially disposed from an electron emission source side. A shortest distance from a maximum radiation intensity portion of the target to the first shielding member is shorter than a shortest distance from the maximum radiation intensity portion of the target to the second shielding member.
摘要:
A radiation generating tube 1 includes: an electron emitting source 3; a target 9 spaced from the electron emitting source 3, for generating a radiation 11 responsive to an irradiation with an electron emitted from the electron emitting source 3; and a tubular shielding member 10 having an electron passing hole 8, wherein the electron passing hole 8 has an electron incident aperture at one end thereof and has a target supporting surface 9b supporting the target 9 at the other end thereof, wherein the target supporting surface 9b is connected through a brazing filler 14 to a periphery of a surface of the target at a side on which the electron is incident, and an opening size of the other end of the electron passing hole 8 is larger than an opening size of the electron incident aperture at the one end thereof.
摘要:
A radioactive ray generating apparatus includes a second shielding member, a target, and a first shielding member, which are sequentially disposed from an electron emission source side. A shortest distance from a maximum radiation intensity portion of the target to the first shielding member is shorter than a shortest distance from the maximum radiation intensity portion of the target to the second shielding member.
摘要:
An inverter circuit is shared by respective drive circuits that supply a predetermined voltage to a lens electrode and a grid electrode, or to a lens electrode and a cathode electrode. A DC voltage obtained by full-wave rectifying a pulse train output from the inverter circuit is supplied to the lens electrode, a DC voltage obtained by half-wave rectifying a pulse train output from the inverter circuit is supplied to the grid electrode or cathode electrode. At times of a first operation and a last operation of the inverter circuit during a period of generating X-rays, operations of the inverter circuit are controlled such that a trans circuit outputs a negative polarity voltage to the full-wave rectifying circuit and the half-wave rectifying circuit, respectively.
摘要:
An X-ray source includes an electron-beam generating unit that generates an electron beam, and a transmission type target electrode to be irradiated with the electron beam to generate X-ray radiation. A plurality of convex portions each having an inclined surface with respect to an incident direction of the electron beam is formed on a surface of the transmission type target electrode.