Abstract: A streak tube comprising an envelope having therein a photocathode surface, a mesh electrode, a focusing electrode, an aperture electrode, a deflection electrode and a phosphor screen positioned along the longitudinal axis of the envelope in the given order. The axis connects the photocathode surface and the phosphor screen which face each other. The photocathode is formed on a concave surface at one end of the envelope, the distance between the photocathode surface and the mesh electrode being greatest at the axis of the envelope and gradually decreasing toward its periphery. Electrons emitted from any position on the photocathode surface at a given instant enter simultaneously into the deflection field formed by the deflection electrode.

Abstract: Cancer diagnosis device contains an endoscope comprising a light pipe used to transmit light beams from respective light sources and an image guide used to observe the flesh of the organism during both diagnosis and treatment. The tip of the endoscope faces toward the focuses where a photosensitive material having an affinity to the focuses of cancer has been absorbed so that a treatment for cancer can be performed by exposing the organism affected by cancer to the laser beam. The attainable the laser beam within a focus is thus increased by the use of the laser beam pulse from a first laser beam pulse source.

Abstract: Light emission to be observed is repeatedly started by starting means when each timing interval is maintained much longer than the sustaining time of the light emission. An image initiated by the starting means is incident on the photoelectric plate of an electron beam shutter tube when produced by imaging means. Sampling interval specifying means specifies different sampling interval for each occurrence of light emission if it detects the start of the starting means. Sutter tube driving means cuts the shuttering electric field during the sampling interval. Brightness on the phosphor screen due to an electronic image emitted during the sampling interval is converted into the corresponding electric signal by a photoelectric converter opposed to the phosphor screen of the shutter tube. The output signal of the photoelectric converter is stored in a memory device through a transferring means, and the contents of the memory device are displayed on displaying means or outputtted by an output device.

Abstract: A tungsten double coil covered with cathode material made from a paste of carbonate mixed with organic solvent. The coil is mounted around a molybdenum cylinder having a cavity in which a heater is installed.

Abstract: An electron-beam shutter for use in an optoelectronic device that forms an image of a luminous event changing at high speed on a screen comprises a shutter plate and a ramp voltage source. The shutter plate has a multitude of through holes extending perpendicular to its surface and a pair of electrodes disposed at its opposite edges and spaced away from each other in a direction perpendicular to the axis of the through holes. The ramp voltage source is connected to the aforesaid electrodes, and the polarity of the ramp voltage changes in a reversing manner. The ramp voltage develops an electric field that crosses the axis of the through holes in the shutter plate and controls the passage of electron beams through the through holes.

Abstract: Using a conventional camera tube, a streak image of light pulse formed on a streaking image tube is converted into an electronic signal, progressively scanned, without interlaced scanning, using scanning lines n-times as many as in standard scanning, and stored in a picture memory unit. The memorized picture is read out as video signals by a 2n:1 interlaced scanning. The video signals are sent to an integrating unit for integration by scanning line. Each integrated value is stored at an address corresponding to the order of the scanning line in a second memory. When the integrated values for all scanning lines have been memorized, they are read out in the order of address to produce a waveform corresponding to the streak image.

Abstract: A method of producing semiconductor photodiodes of indium antimonide, by growing an indium antimonide epitaxial layer of one type conductivity onto a substrate of indium antimonide of another type conductivity, utilizing conventional vapor phase or liquid phase epitaxial techniques, wherein the antimony in the epitaxial layer is partially replaced by either arsenic or phosphorus, thus resulting in a high performing photoelectric device.