Canon Kabushiki Kaisha

Sony Corporation

Hitachi, Ltd.

Sophia School Corporation

Canon Anelva Corporation

Ganon Kabushiki Kaisha

Ichiro Nomura

Hidetoshi Suzuki

Tetsuya Kaneko

Yoshikazu Banno

Toshihiko Takeda

Naoto Nakamura

Kazuyuki Ueda

Takao Ogura

Masato Yamanobe

Yasue Sato

Toshikazu Ohnishi

Seishiro Yoshioka

Kojiro Yokono

Miki Tamura

Shinya Mishina

Takeo Ono

Haruhito Ono

Masanori Mitome

Shuji Aoki

Yoshihiro Yanagisawa

Katsumi Kishino

Mitsuru Yamamoto

Yasuhiro Hamamoto

Toshiaki Majima

Takeo Tsukamoto

Osamu Tsujii

Tatsuya Iwasaki

Hitoshi Nakamura

Tsunenori Asatsuma

Kohei Nakata

Koshi Tamamura

Takashi Noma

Rie Ueno

Sumiko Fujisaki

Takeshi Kikawa

Kumi Iwai

Masanori Takenouchi

Hideaki Mitsutake

Toshihiko Miyazaki

Hisaaki Kawade

Akira Miyake

Yoshiyuki Osada

Mitsuaki Amemiya

Aoji Isono

Eiji Yamaguchi

Kazuhiro Sando

Fumitaka Kan

Hiroaki Toshima

Noritake Suzuki

Yasuyuki Todokoro

Shigeki Matsutani

Naoji Hayakawa

Tamayo Hiroki

Kunihiko Tasai

Yoshihisa Sano

Keisuke Yamamoto

Akira Shimizu

Masahiko Okunuki

Hiroshi Nakajima

Koji Yamazaki

Sotomitsu Ikeda

Kazuya Miyazaki

Hirokatsu Miyata

Katsuhiko Shinjo

Tsukuru Ohtoshi

Michiyo Nishimura

Yuji Kasanuki

Shigehisa Tanaka

Masahiro Okuda

Shinichi Kawate

Kazuhiro Takada

Kazuya Tsujino

Takashi Shiozawa

Hirokuni Kawashima

Koji Goto

Isamu Kajita

An electron gun includes a cathode including an electron emitting portion, an extraction electrode for extracting electrons emitted from the electron emitting portion, and a focusing electrode for focusing the electrons extracted by the extraction electrode. The focusing electrode includes an outside electrode having a tubular shape, and an inside electrode arranged inside the outside electrode. The inside electrode defines a first space having a columnar shape, and includes a first surface on a side of the cathode, and a second surface on an opposite side of the first surface. An inside surface of the outside electrode and the second surface of the inside electrode define a second space. The inside electrode includes an electron passage hole, and a communicating portion which makes the first space and the second space communicate with each other.

Electron gun, X-ray generation apparatus, and X-ray imaging apparatus

A radiation generating apparatus includes a radiation generation tube including an electron emitting source having an electron emitting member, a transmission type target, a tubular backward shielding member having an electron passing hole facing the target layer at one end, located at the electron emitting source side of the transmission type target, and connected to the periphery of the base member. The radiation generating apparatus further includes a collimator having an opening for defining an angle for extracting the radiation at the opposite side of the electron emitting source side of the transmission type target, and an adjusting device connected to the collimator, and configured to vary an opening diameter of the opening, wherein the target layer has a portion separated from a connection portion of the base member and the backward shielding member at the periphery.

Radiation generating tube and radiation generating apparatus including radiation generation tube

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.

X-ray generator and X-ray imaging apparatus

A radiation generating apparatus includes: an envelopehaving a first windowthrough which a radiation is transmitted; and a radiation tubebeing held within the envelope, and having a second windowwhich is arranged in opposition to the first window, and through which the radiation is transmitted; and a radiation shielding memberthermally connected to the second window, having a radiation transmitting holearranged in communication with the second window, and having a protruding portion protruding from the second windowtoward the first window. A thermally conductive memberhaving a higher thermal conductivity rather than that of the radiation shielding memberis connected to the protruding portion of the radiation shielding member. The radiation generating apparatus can shield an unnecessary radiation and cool a target with a simple structure and is entirely reduced in weight.

Radiation generating apparatus and radiation imaging apparatus

In a target structure according to the present invention, a target is provided on a central area of an insulating substrate, and a first conductive member for supplying a voltage to the target is provided on a peripheral area of the insulating substrate which is exclusive of an area overlapping the target and is not covered by the target, so that the first conductive member is in contact with and electrically connected to the peripheral portion of the target. Consequently, it is possible to easily form a voltage supply line to the target without preventing diffusion of a heat generated in the target to the substrate and while suppressing emission of an unnecessary X-ray.

Target structure and X-ray generating apparatus

A radiation generating apparatus of the present invention includes an envelopeincluding a first windowallowing radiation to pass; a radiation tubethat is accommodated in the envelope, and includes a second windowallowing radiation to pass, at a position opposite to the first window; a radiation passing holethat is thermally connected to the second windowand communicates with the second window; and a radiation shielding memberprotruding from the second windowtoward the first window. In this apparatus, a thermally conductive memberhaving a higher thermal conductivity than the radiation shielding memberis connected to an outer periphery of the protruding portion of the radiation shielding member. The simple configuration can shield unnecessary radiation, and cool the target, while facilitating reduction in weight.

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.

X-ray generation apparatus and X-ray radiographic apparatus

There is provided a radiation generating apparatus having a simple structure and capable of shielding unnecessary radiation, cooling a target, reducing the size and weight of the apparatus, and achieving higher reliability, and a radiation imaging apparatus having the same. A transmission type radiation tube is held inside a holding container filled with a cooling medium. The transmission type radiation tube includes an envelope having an aperture, an electron source arranged inside the envelope so as to face the aperture of the envelope, a target unit for generating a radiation responsive to an irradiation with an electron emitted from the electron source, and a shield member for shielding a part of the radiation emitted from the target unit. The cooling medium contacts at least a part of the shield member.

A radiation generating apparatus has a radiation generating tube held in a holding containerand a cooling medium between the holding container and the radiation generating tube. The radiation generating tube includes an envelope with an aperture, an electron emitting source arranged in the envelope, a target arranged facing the source, for generating radiation responsive to irradiation with an electron beam emitted from the source, and a tubular shield for holding the target by an inner wall thereof and shielding part of the radiation emitted from the target. The shield is arranged to protrude outward of the envelope so that the target is positioned on an outer side of the aperture, and the cooling medium contacts at least a part of the shield.

A radiation generating tubeincludes: an electron emitting sourcea targetspaced from the electron emitting sourcefor generating radiationresponsive to irradiation with an electron beam from the electron emitting sourceand a tubular shielding memberhaving an electron passing holewherein the electron passing holehas an electron incident aperture at one end thereof and has a target supporting surfacesupporting the targetat the other end thereof, wherein the target supporting surfaceis connected through a brazing fillerto 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 holeis larger than an opening size of the electron incident aperture at the one end thereof.

Radiation generating tube and radiation imaging apparatus using the same

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.

Radioactive ray generating apparatus and radioactive ray imaging system

Provided is an X-ray generator comprising an X-ray tube including a cylindrical body; an electron source in the body; a target at an end of the X-ray tube facing the electron source, the target generating X-rays by irradiation with electrons; a container in which the X-ray tube is arranged; insulating liquid filled between the X-ray tube and the container; and

X-ray generator tube having improved cooling container and X-ray imaging apparatus including the same

A radiation imaging apparatus according to the present invention includes a radiation source, a reflective structure where at least three reflective substrates are arranged with an interval and radiations being incident into a plurality of passages whose both sides are put between the reflective substrate are reflected and parallelized by the reflective substrate at both sides of the passage to be emitted from the passage, a radiation detector, and an image construction unit that constructs an image of an object based on an intensity of the radiation which is emitted from each of the passages, transmits the object and is detected by the radiation detector. When one edge of the reflective structure is an inlet of the radiation and the other edge is an outlet of the radiation, a pitch of the reflective substrates at the outlet is larger than a pitch at the inlet.

Radiation imaging apparatus

The present invention provides an X-ray optical apparatus including an X-ray reflective structure in which at least three reflective substrates are arranged with an interval and an X-ray which is incident into a plurality of X-ray passages whose both sides are put between the reflective substrates is reflected from the reflective substrate at both sides of the X-ray passage to be parallelized and emitted from the X-ray passage. When an edge of the X-ray reflective structure is an inlet of the X-ray and the other edge is an outlet of the X-ray, a pitch of the reflective substrates at the outlet is larger than a pitch at the inlet. Therefore, it is possible to efficiently parallelize the incident X-ray to be emitted with a simple structure.

X-ray optical apparatus

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.

X-ray generating apparatus and method of driving X-ray tube

Growing community of inventors

Atsugi, Japan

Ichiro Nomura