Tokyo Shibaura Denki Kabushiki Kaisha

Tokyo Shibaura Electric Co., Ltd.

Kabushiki Kaisha Toshiba

Norio Harao

Yoshiharu Obata

Hiroshi Minami

Fumio Sugimori

Chikae Nishino

Hidero Anno

Katsuhiro Ono

Takashi Noji

Takashi Kuze

Yoshimitsu Aramaki

Tatsuo Yamaguchi

Teruhide Nishikawa

Takuji Tsuneoka

Hiroki Tokizawa

An X-ray image intensifier includes an input screen. The input screen has a base plate, a phosphor layer formed on the base plate, a transparent conductive film formed on the phosphor layer, and a photoemissive layer formed on the conductive film. The conductive film has a crystallinity wherein an average crystal size along a direction parallel to a surface of the conductive film is 500 .ANG. or more.

X-ray image intensifier having a crystalline conductive film on the

An input phosphor screen includes a substrate having a substantially smooth surface, and first and second phosphor layers both vapor-deposited sequentially on the substrate. The first layer is made of phosphor crystal particles having a mean diameter of 15 .mu.m or less. The second layer has a thickness ten or more times that of the first layer and is made of individual columnar crystals of alkali halide grown vertically on the crystal particles, standing close together with fine spaces therebetween. A third layer is preferably deposited on the second layer as a continuous film. These three layers can be deposited by evaporating a phosphor material or materials at a prescribed temperature and at a predetermined degree of vacuum.

Method of manufacturing a radiation excited input phosphor screen

A vacuum container of a radiation image multiplier tube is disclosed, which is provided with a radiation input window made of Al or an Al alloy and an output portion made of a glass or ceramic insulator for outputting radiation image multiplied signals. Between the input window and the output portion is interposed a ring made of Fe or an Fe alloy, and an airtight joint between the ring of the input window is effected by hot pressure-bonding through a thin layer of Ni, Cu or Al. A method of manufacturing the vacuum container by means of such hot pressure-bonding is also disclosed.

Vacuum container of radiation image multiplier tube and method of

An electron tube which comprises a metal vacuum envelope, a metal high energy ray input window fitted to the envelope, and photoelectric screen held in the envelope at a point close to the high energy ray input window, and which is characterized in that a semiconductor photosensor is set at that position within the vacuum envelope which lies near the peripheral edge of the photoelectric screen and to which a material constituting the photoelectric screen can be deposited, said photoelectric screen comprising a sealed container provided with a light input window and a semiconductor element received in the container.

Electron tube having a photoelectric screen

An image intensifier apparatus which comprises an image intensifier for converting incoming radiation into light rays on an input fluorescent screen, further converting said light rays into electron beams on a photocathode, focusing said light rays by an electron lens system and converting said focused light rays into the visible form by an output screen; and a housing which receives the image intensifier and whose inner side wall is fitted with a radiation leakage-preventing layer and first magnetism shielding layer, and wherein second magnetism-shielding layer having a high radiation permeability is formed on any of those portions of the image intensifier apparatus into which radiation is carried.

Image-intensifier apparatus

A highly evacuated X-ray image intensifier, whose X-ray inlet window section made of aluminium or alloy thereof is hermetically fused to the output section of a glass vessel by means of a joint ring formed of glass-wettable alloy or alloy fusible with glass, wherein the X-ray inlet window section and joint ring are hermetically fused together by inserting therebetween at least one intermediate member selected from the group consisting of the following materials:

X-ray image intensifier

A storage target capable of storing an electric charge corresponding to an input signal and also converting the stored charge image into a visible form is provided on the inner wall of a faceplate closing the opening of a funnel constituting an evelope of a direct-viewing storage tube. The storage target includes a collector electrode formed on the inner wall of the faceplate; a plurality of fluorescent dot islands provided in contact with the collector electrode; and a dielectric material formed between those of the fluorescent dot islands which are arranged on the outermost peripheral edge of the storage target and a sealed portion joining the opening of the funnel and the faceplate so as to face the collector electrode and surround the effective area of the storage target, thereby preventing the luminescence of that portion of the target which is positioned around the peripheral edge of the effective area of the storage target.

Direct-viewing storage tube with opaque strip on transparent collector

An X-ray image intensifier photofluorography apparatus for correcting the output image brightness while photographing an optical image of a subject in an optical camera through a lens system by amplified light into which X-rays are converted after passing from an X-ray source through the subject to an X-ray image intensifier, wherein filter means whose X-ray permeability is represented by an axially asymmetric form relative to the central horizontal axis between the X-ray source and X-ray image intensifier to correct the distribution of the intensity of X-rays emitted from the X-ray source. The X-ray permeability of the filter means is adjusted by changing a length of X-ray path or the thickness of the filter means through which X-rays are transmitted. The thickness of the filter means is determined in consideration of the distribution of the intensity of X-rays emitted from the X-ray source and the distribution of brightness of each of light images from the X-ray image intensifier and from an optical lens system. Adjustment of the distribution of the X-ray intensity by the filter means enables the light image to be photographed with a suitable brightness corresponding to the X-ray permeability of the subject on a film received in the optical camera.

X-ray image intensifier photofluorography apparatus for correcting the

A cathode ray tube device includes a cathode ray tube of which cathode is heated in a waiting state as well as a normal operating state to emit an electron beam. The emitted electron beam in the waiting state is prevented from impinging the fluorescent surface of the tube by supplying a predetermined voltage or current independent of a signal for the normal operation to the grid of an electron gun assembly or a deflecting device.

Growing community of inventors

Ayase, Japan

Norio Harao