Kabushiki Kaisha Toshiba

Tokyo Shibaura Electric Co., Ltd.

Toshiba Electronic Devices & Storage Corporation

Hiroshi Minami

Norio Harao

Yasuhiko Kato

Takashi Kuze

Hirofumi Kuribara

Kouichi Toukairin

Kenji Mizuochi

Shigeru Juman

Takuji Tsuneoka

According to one embodiment, a disk device includes a housing, magnetic disks in the housing, and a printed circuit board attached to an outer surface of a bottom wall of the housing. The housing includes a base including a bottom wall and a side wall, and at least two base-side positioning portions provided on the bottom wall in a region overlapping the side wall. The printed circuit board includes at least two board-side positioning portions each engaged with the base-side positioning portion. One of the base-side positioning portion and the board-side positioning portion includes a pin extending substantially perpendicular to the bottom wall, and another includes a hole into which the pin is fitted.

Disk device

An X-ray image tube has a vacuum envelope, a photocathode arranged at an input side in the vacuum envelope and having a curved surface open to an output side thereof, and a phosphor screen arranged at an output side in the vacuum envelope and having a surface on which electrons emitted from the photocathode are electrooptically focused. The photocathode consists of a central surface region with a diameter which is 1/2 to 4/5 of the diameter of the photocathode and a peripheral surface region. The central surface region has a profile such that an increment of the meridional curvature radius from the center to a peripheral portion thereof is larger than a constant derived from a linearity between the increment and a distance from the axis of the photocathode. The peripheral surface region has a profile such that an increment of the meridional curvature radius from an inner peripheral portion to an outer peripheral portion is smaller than the constant derived from a linearity between the increment and the distance from the axis of the photocathode.

X-ray image tube

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

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

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Yokohama, Japan

Hiroshi Minami