摘要:
In an X-ray generation apparatus of transmission type including an electron passage surrounded by and formed in an electron passage forming member, and generating an X-ray by colliding electrons having passed through the electron passage against a target, wherein the electron passage includes a secondary X-ray generation portion that generates an X-ray with collision of electrons reflected by the target against the secondary X-ray generation portion, the secondary X-ray generation portion and the target are arranged such that the X-ray generated with direct collision of the electrons against the target and the X-ray generated with the collision of the electrons reflected by the target against the secondary X-ray generation portion are both radiated to an outside, and an atomic number of a material of the electron passage forming member is larger than that of the target. X-ray generation efficiency is increased by effectively utilizing the electrons reflected by the target.
摘要:
Provided is an X-ray generator including an electron passage in an electron-passage forming member; and a target on an insulative substrate. The transmission X-ray generator irradiates the target with electrons that have passed through the electron passage to generate X-rays. The target is provided at a central region of the substrate; the electron passage accommodates a secondary-X-ray generating section that generates X-rays by irradiation with electrons reflected from the target; the secondary-X-ray generating section and the target are disposed so that both of X-rays generated by direct irradiation of the target with the electrons and X-rays generated by irradiation of the secondary-X-ray generating section with the electrons reflected from the target are radiated to the outside; and at least part of the peripheral region of the substrate has higher transmittance for the X-rays generated at the secondary-X-ray generating section than the central region of the substrate.
摘要:
Provided is an X-ray generator including an electron passage in an electron-passage forming member; and a target on an insulative substrate. The transmission X-ray generator irradiates the target with electrons that have passed through the electron passage to generate X-rays. The target is provided at a central region of the substrate; the electron passage accommodates a secondary-X-ray generating section that generates X-rays by irradiation with electrons reflected from the target; the secondary-X-ray generating section and the target are disposed so that both of X-rays generated by direct irradiation of the target with the electrons and X-rays generated by irradiation of the secondary-X-ray generating section with the electrons reflected from the target are radiated to the outside; and at least part of the peripheral region of the substrate has higher transmittance for the X-rays generated at the secondary-X-ray generating section than the central region of the substrate.
摘要:
In an X-ray generation apparatus of transmission type including an electron emission source, and a target generating an X-ray with collision of electrons emitted from the electron emission source against the target, the X-ray generation apparatus further includes a secondary X-ray generation portion generating an X-ray with collision of electrons reflected by the target against the secondary X-ray generation portion, and the secondary X-ray generation portion and the target are arranged such that the X-ray generated with the direct collision of the electrons against the target and the X-ray generated with the collision of the electrons reflected by the target against the secondary X-ray generation portion are both radiated to an outside. X-ray generation efficiency is increased by effectively utilizing the electrons reflected by the target.
摘要:
Provided is an X-ray generator (10) which causes electrons having passed through an electron path (4), formed by an electron path formation member (3) surrounding the periphery of the electron path (4), to be emitted against a target to generate an X-ray, in which: an X-ray generated when the sub X-ray generating portion (5) provided in the electron path (4) is irradiated with the electrons backscatterred off the target is capable of being taken out; a material which constitutes the target and a material which constitutes at least the sub X-ray generating portion (5) of the electron path formation member (3) are the same material of which atomic number is 40 or greater. X-ray generation efficiency can be improved by effectively using the electrons backscatterred off the transmission target.
摘要:
In an X-ray generation apparatus of transmission type including an electron emission source, and a target generating an X-ray with collision of electrons emitted from the electron emission source against the target, the X-ray generation apparatus further includes a secondary X-ray generation portion generating an X-ray with collision of electrons reflected by the target against the secondary X-ray generation portion, and the secondary X-ray generation portion and the target are arranged such that the X-ray generated with the direct collision of the electrons against the target and the X-ray generated with the collision of the electrons reflected by the target against the secondary X-ray generation portion are both radiated to an outside. X-ray generation efficiency is increased by effectively utilizing the electrons reflected by the target.
摘要:
An electron beam apparatus is provided having an electron emitting device which has a simple configuration, exhibits high electron emission efficiency, operates stably, and in which emitted electrons are effectively converged. The electron beam apparatus includes: an insulator having a notch on its surface; a gate positioned on the surface of the insulator; at least one cathode having a protruding portion protruding from an edge of the notch toward the gate, and positioned on the surface of the insulator so that the protruding portion is opposed to the gate; and an anode arranged to be opposed to the protruding portion via the gate, wherein the gate is formed on the surface of the insulator so that at least a part of a region opposed to the cathode is projected outward and recessed portions are provided in which ends of the gate are recessed and interpose the projected region.
摘要:
An image forming apparatus in which a first substrate provided with an electron-emitting device and an image displaying member which electrons emitted from the electron-emitting device irradiate are arranged to be opposed is provided with a deflecting means deflecting the electrons emitted from the electron-emitting device and a trapping unit trapping an inert gas ionized by the electrons. Thereby, the damages of the electron-emitting device by the inert gas are prevented, and the life of an image display apparatus is aimed to be elongated.
摘要:
A semiconductor laser includes a distributed feedback semiconductor laser structure having a plurality of regions. The regions are electrically separated from each other. A phase shift section is provided in a grating in one of the regions. In the semiconductor laser, .alpha. parameters for transverse electric (TE) and transverse magnetic (TM) polarization modes, in the vicinity of threshold currents for the TE mode and the TM mode, are made different from each other. An .alpha. parameter is defined by 4.pi./.lambda..multidot.(dn/dN)/(dg/dN) where .lambda. is a Bragg wavelength, n is an effective refractive index, N is an injection carrier density and g is a gain for each of the TE mode and the TM mode.
摘要:
A convex portion 2 having a specific sectional shape is formed on a substrate 1 between electrodes 3 and 4, and a gap 6 is formed on a conductive film 5, connecting the electrodes 3 and 4, on the convex portion 2, whereby the distance from the center of the gap 6 serving as a electron-emitting portion to the stagnation point is reduced so as to enhance an electron emission efficiency.