Canon Kabushiki Kaisha

Shuji Aoki

Kazuyuki Ueda

Miki Tamura

Ichiro Nomura

Yoshihiro Yanagisawa

Takahiro Oguchi

Takao Ogura

Yasue Sato

Koji Yamazaki

Akihiko Yamano

Mitsutoshi Kuno

Naoto Abe

Kazuya Miyazaki

Makiko Mori

Yasuhiro Hamamoto

Tatsuro Yamazaki

Kazuhiro Sando

Koichi Tsunoda

Hideshi Kawasaki

Shoji Ihara

Shunzo Imai

Izumi Tabata

Hisashi Sakata

Provided is an X-ray generating apparatus, which includes: an X-ray generating tube configured to emit X-rays through a first window; an outer case configured to contain the X-ray generating tube and provided with a second window transmitting the X-rays at a position facing the first window; an insulating fluid with which an unoccupied space of the outer case is filled; an insulating member located between the first window and the second window and provided with an opening in an irradiation area of the X-ray through the first window; and an insulating third window removably fit into the opening of the insulating member, wherein a linear expansion coefficient of the third window is greater than a linear expansion coefficient of the insulating member, and the third window and the first window face each other via a gap through which the insulating fluid is flowable.

X-ray generating apparatus and radiography system

Both the size reduction and the increase in breakdown voltage of a high-voltage isolation transformer are realized, which is to be used in an insulating liquid in an X-ray generating apparatus. In the isolation transformer, an annular core and a primary coil wound around the annular core are housed in a first container, and a secondary coil is wound around the first container. A first opening through which an insulating liquid flows is provided in the first container.

Isolation transformer, and X-ray generating apparatus and radiography system including the same

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

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 a multi-source radiation generating apparatus including a plurality of combinations of a cathode and a target, an extraction electrode is disposed for a plurality of cathodes in common. When a potential of the extraction electrode is constant, potentials for the cathodes are selectively switched between a cutoff potential which is higher than the potential of the extraction electrode and an emission potential which is lower than the potential of the extraction electrode.

Multi-source radiation generating apparatus and radiographic imaging system

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 generator includes: a radiation tube configured to generate radiation by emitting electrons from a cathode through a grid to a target; a grid-voltage generating unit configured to apply an extraction voltage to the grid in response to an external request for radiation output; a cut-off voltage generating unit configured to generate a cut-off voltage applied to the grid so as to lower the potential of the grid relative to the potential of the cathode when there is no external request for the radiation output; and a detection unit configured to detect a decrease in the cut-off voltage, wherein the target is not irradiated by the electrons when the decrease in the cut-off voltage is detected.

Radiation generator including cut-off voltage generator and associated detection unit

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 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

A radiation generating apparatusaccording to the present invention including: a radiation generating tubehaving a target, a tubular shielding memberthat shields a part of a radiation generated from the targetand also has an aperturethrough which the radiation generated from the targetpasses, and an envelopethat has the targetso as to be brought into contact with the internal space thereof and also has the tubular shielding memberso as to protrude toward an external space thereof; a storage containerfor storing the radiation generating tubetherein; and an insulating liquidthat comes in contact with the tubular shielding memberand the storage container, wherein the tubular shielding memberhas a protruding portion P, and the protruding portion P is covered with a solid insulating member

Radiation generating apparatus and radiation imaging apparatus using the same

In a radiation imaging apparatus, an envelope has a first window for transmitting radiation and is filled with an insulating liquid, and a radiation tube in the envelope has, at a position facing the first window, a second window for transmitting the radiation, and a shielding member. A solid insulating member is arranged between the shielding member and the inner wall of the envelope, and an opening is formed at a position on the insulating member corresponding to the first window. The shortest distance from the shielding member to the first window or the inner wall of the envelope through the opening of the insulating member without the insulating member is made to be longer than the shortest distance from the shielding member to the first window or the inner wall of the envelope through the insulating member, thereby improving withstand voltage performance without reducing an radiation amount.

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

The present invention relates to a radiation generating apparatus which includes an envelope provided with a first window through which radiation is transmitted, a radiation tube housed in the envelope and provided with a second window through which the radiation is transmitted, the second window being located at a position opposite the first window, and an insulating fluid adapted to fill the space between the inner wall of the envelope and the radiation tube. Plural plates are arranged side by side between the first window including its periphery and the second window including its periphery, and overlapping one another with gaps between them. The gaps are formed among the plates, and thereby the withstanding voltage between the first window and second window is made larger.

In a construction having a radiation tube in an envelope filled with an insulating liquid, a radiation generating apparatus which realizes a miniaturization of the apparatus, an improvement of a withstanding voltage between the envelope and the radiation tube, and a decrease in attenuation amount of the radiation and a radiation imaging apparatus using the radiation generating apparatus are provided. The radiation generating apparatus has an envelopehaving a first windowfor transmitting the radiation, a radiation tubeenclosed in the envelopeand having a second windowfor transmitting the radiation at a position in opposition to the first window, and an insulating liquidfilled between the envelopeand the radiation tube. A solid-state insulating memberis placed between the first windowand its periphery and the second windowand its periphery.

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.

Growing community of inventors

Yokohama, Japan

Shuji Aoki