Hamamatsu-photonics K.k.

Tomohiro Ishizu

Tetsuya Fujita

Takahiro Suzuki

Suenori Kimura

Motohiro Suyama

Masuo Ito

Atsuhito Fukasawa

Tetsuya Morita

Yasuyuki Egawa

Masami Furuhashi

A photomultiplier according to an embodiment of the present invention has a sealed container the interior of which is maintained in a vacuum state, and an electron multiplier unit housed in the sealed container, and the sealed container is partly constructed of ceramic side tubes, on the assumption that the photomultiplier is used under high-temperature, high-pressure environments. The photomultiplier further has a structure for fixing an installation position of the electron multiplier unit relative to the sealed container, for improvement in anti-vibration performance.

Photomultiplier and sensor module

Photomultiplier tube

An electron tube of the present invention includes: a vacuum vessel including a stem portion made of quartz and formed with an opening; a lid portion connected to the stem portion via a joining member made of aluminum so as to seal the opening, having a recess portion depressed to a vacuum side in the opening, and made of Kovar; a voltage applying section arranged in the vacuum vessel; and wiring for electrically connecting the voltage applying section and the lid portion.

Electron tube

A photomultiplier excellent in vibration resistance and improved in pulse linearity characteristic and time-response. The fourth, and sixth to ninth dynodes (Dy, Dyto Dy) have a similar shape to that of the second dynode (Dy). The third and fifth dynodes (dy, Dy) are smaller than the dynode (Dy). The first to tenth dynodes (Dyto Dy) are so arranged that the dynode inner space path defined between opposed dynodes is perpendicular to the tube axis (X). The anode (A) is a mesh anode (A), and is opposed to the dynode (Dy) with respect to the tube axis (X).

Photomultiplier

A photomultiplier that prevents rattling between the dynodes and the base plates, the parts being fixed securely to achieve excellent vibration resistance. The dynode of the second stage (Dy) includes a curved surface (DyA) having an arcuate cross-section and a flat surface (DyB) formed continuously and flush with the curved surface. The curved surface (DyA) and flat surface (DyB) make up the secondary electron emitting surface. Side walls (DyC) erected from the curved surface (DyA) are formed through a pressing process on either lengthwise end of the curved surface (DyA). First ear portions (DyD) extend outward from both side walls (DyC). Second ear portions (DyE) extend outward from both lengthwise ends of the flat surface (DyB). The first and second ear portions (DyD and DyE) are not parallel to each other but form a fixed angle.

A photomultiplier tube excellent in vibration resistance and having an anode with good pulse linearity characteristic. The photomultiplier tube has a mesh anode (A) composed of an anode frame (A) and a mesh electrode (A) supported and surrounded by the anode frame (A). The central portion of one long side (AB) of the anode frame (A) serves as an electron converging part (F). The inner side of the anode frame (A) swells toward the inner part of the anode (A), more from the middle of the long side (AB) toward the corners of the anode frame (A) along the long side (AB), and therefore the thickness of the anode frame (A) increases from the middle of the long side (A) to the corners along the long side (AB).

The present invention relates to a light-receiving module of a heat-resistant, vibration-resistant type for use in petroleum exploration or the like, and a radiation detecting apparatus equipped with the light-receiving module. The light-receiving module comprises a photomultiplier having a faceplate and a stem opposing each other, a bleeder circuit board provided so as to sandwich the stem together with the faceplate and electrically connected to the photomultiplier, a module case provided so as to accommodate the photomultiplier and the bleeder circuit board, said module case having an opening for exposing the faceplate of the photomultiplier, a step provided on an inner surface of the module case, and a stopper seated on the step, defining the position of the photomultiplier in the module case.

Growing community of inventors

Hamamatsu, Japan

Tomohiro Ishizu