Abstract:
According to the photomultiplier tube, the dynode unit 10 is constructed from a plurality of stages of dynodes 11 laminated one on another for multiplying incident electrons in a cascade manner through each of a plurality of channels. The anode unit 13 has a plurality of anodes 24 which define a plurality of electron passage gaps 14 each for transmitting the electrons emitted from the dynode unit 10 at a corresponding channel. The inverting dynode plate 15 is provided with a plurality of electron incident strips 17 each for receiving electrons having passed through a corresponding electron passage gap 14 in the anode unit 13, multiplying the electrons, and guiding the electrons back to the corresponding anode 24. The electron incident strip 17 is designed to have: the main surface 18a confronting the electron passage gap 14; and the rising surface 18c rising toward the anode unit 13 from the edge 18b of the main surface 18a which is located at a position confronting the electron passage gap 14 in the anode unit 13.
Abstract:
A photomultiplier includes a photoelectric surface for photoelectrically converting incident light and emitting electrons, and a plurality of stages of dynodes for multiplying the electrons. The photomultiplier includes a first dynode array including box-and-grid dynodes arranged in a vessel and a second dynode array including in-line dynodes arranged in the vessel. A dynode having a curved secondary electron emitting layer opposes both a secondary electron emitting layer of a last stage dynode of the first dynode array and a secondary electron emitting layer of a first-stage dynode of the second dynode array.
Abstract:
A focus electrode for an elongated hexagonal faceplate photomultiplier tube. The elongated hexagonal face plate and an off-center cage assembly are made to function properly in a photomultiplier tube by the use of a uniquely shaped asymmetric focus electrode. The focus electrode has a base which is a partial circle with two parallel chords and is constructed with a side wall around the perimeter of the base. The side wall has different heights above the two parallel chords of the base and slopes down to minimum but equal heights at points on the curved perimeter which are approximately at the center plane of the tube.
Abstract:
A planar mesh structure that facilitates forming into a non-planar mesh structure comprises a peripheral support ring lying in a plane with a plurality of first members and a plurality of second members lying in the plane. The first members comprise substantially concentric, spaced-apart mesh rings of progressively decreasing diameter disposed within the peripheral support ring. The plurality of second members extend generally inwardly from the peripheral support ring and terminate at the innermost of the first members. The second members intersect the first members disposed between the peripheral support ring and the innermost first member to form, with the intersected first members, a plurality of apertures. In one embodiment, the second members are generally arcuately shaped and lie in a first plane with the support ring and the first members. The arcuate shape permits the second members to be formed in a second plane substantially orthogonal to the first plane without significantly stretching the second members. In an alternative embodiment, the second members have a generally undulatory shape lying in the first plane with the support ring and the first members. The generally undulatory shape provides forming relief which permits the second members to be formed into a second plane substantially orthogonal to the first plane without significantly stretching the second members.
Abstract:
A photomultiplier tube comprises an electron multiplier assembly including a pair of oppositely-disposed insulative support spacers. A plurality of elements including an ultimate dynode and an anode are affixed to the support spacers. The ultimate dynode comprises a relatively inflexible multilateral hollow member having two plane-face surfaces lying at an acute angle to one another and terminating at a lower transverse edge. The ultimate dynode includes dynode mounting tabs extending from opposing ends thereof for affixing the ultimate dynode to the support spacers. The anode includes a substantially flat electron permeable mesh portion spaced from one of the plane-face surfaces of the ultimate dynode. Anode mounting tabs extend from opposing ends thereof for affixing the anode to the support spacers. Electrical leakage isolation slots are formed in the support spacers to increase the electrical leakage path length across the support spacers between the ultimate dynode and the anode.
Abstract:
The structure comprises an evacuated envelope that includes a transparent front panel having a cathodoluminescent screen thereon and a back panel interconnectably sealed to the front panel. A plurality of first vanes, spaced from and parallel to each other, are perpendicular to and in contact with the back panel and a plurality of second vanes, spaced from and parallel to each other, are perpendicular to and in contact with the front panel. The first and second vanes are transverse to each other and provide mutual support for each other. Electroding to control operation of the device is formed directly on the vanes.
Abstract:
AN ELECTRON IMAGE OF THE DISPERSED SPECTRAL LINES CHARACTERISTIC OF A CHEMICAL ELEMENT BEING ANALYZED IS PERIODICALLY SCANNED ACROSS A SLIT-LIKE APERTURE OF AN IMAGE DISSECTOR PHOTOTUBE. A GATING PULSE IS DELAYED RELATIVE TO THE START OF EACH SWEEP TO SIGNAL THE TIME WHEN THE NARROW RANGE OF INTEREST IN THE ELECTRON IMAGE IS PASSING THROUGH THE SLIT; AND THE GATING PULSE ENABLES AN AMPLIFIER RECEIV-
ING THE OUTPUT SIGNAL OF THE PHOTUBE TO SELECTIVELY AMPLIFY ONLY THIS NARROW RANGE. THE SIGNAL FROM THE GATED AMPLIFIER IS THEN FED TO AN INTEGRATOR CIRCUIT WHICH STORES THE GATED SIGNAL FOR A KNOWN NUMBER OF SWEEPS.
Abstract:
The photomultiplier tube 1 is provided with an upper frame 2 and a lower frame 4 which are arranged so as to oppose each other, with the respective opposing surfaces 20a, 40a made with an insulating material, a side wall part 3 which constitutes a casing together with the frames 2, 4, a plurality of stages of electron multiplying parts 33 which are arrayed so as to be spaced away sequentially from a first end side to a second end side on the opposing surface 40a of the lower frame 4, a photocathode 41 which is installed on the first end side so as to be spaced away from the electron multiplying parts 33, converting incident light from outside to photoelectrons, an anode part 34 which is installed on the second end side so as to be spaced away from the electron multiplying parts 33 to take out electrons multiplied by the electron multiplying parts 33 as a signal, and a wall-like electrode 32 which is arranged so as to enclose the photocathode 41 when viewed from a direction directly opposite to an opposing surface 401 and having a notched part 35 at a site opposing the electron multiplying parts 33 on the second end side.