Abstract: Disclosed is a rotary anode type X-ray tube comprising an anode target emitting an X-ray, a rotating mechanism for rotatably supporting the anode target, the rotating mechanism including an inside rotor and a stator, bearings being arranged between the inside rotor and the stator, and a vacuum envelope housing the anode target and the rotating mechanism. Dynamic slide bearings each using a liquid metal lubricant and ball bearings are used as the bearings arranged between the inside rotor and the stator.

Abstract: A rotary anode X-ray tube, comprising a rotor, a stationary structure, a dynamic pressure slide bearing formed between the rotor and the stationary structure, the stationary structure having a lubricant storage chamber and provided with a lubricant passageway, and a vacuum vessel. Holes are formed in the stationary structure extending from the lower edge surface along the tube axis and not to cross the lubricant storage chamber and the lubricant passageway. Heat transfer members for the stationary structure having a heat conductivity higher than that of the stationary structure are inserted into the holes, respectively. A heat transfer member having a heat conductivity higher than that of the inner cylindrical structure of the rotor is bonded in a cylindrical form to the outer circumferential wall of the inner cylindrical structure constituting a bearing. A heat transfer member can be mounted to each of the rotor and the stationary structure.

Abstract: Disclosed is a rotary anode type X-ray tube comprising an anode target emitting an X-ray, a rotating mechanism for rotatably supporting the anode target, the rotating mechanism including an inside rotor and a stator, bearings being arranged between the inside rotor and the stator, and a vacuum envelope housing the anode target and the rotating mechanism. Dynamic slide bearings each using a liquid metal lubricant and ball bearings are used as the bearings arranged between the inside rotor and the stator.

Abstract: An ultraviolet range laser comprising a vacuum vessel having an open end portion hermetically sealed with an output mirror glass substrate, which is featured in that the output mirror glass substrate is formed of a glass material which is capable of allowing a laser beam of 337 nm in wavelength to pass therethrough at a transmittance of 80 to 96% as measured when the thickness of the glass substrate is set to 5 mm and whose thermal expansion coefficient falls in the range of 44.times.10.sup.-7 /.degree.C. to 55.times.10.sup.-7 /.degree.C. at a temperature of 0.degree. C. to 300.degree. C., and in that a metallic sealing ring is hermetically attached to the open end portion of vacuum vessel and the hermetical sealing of the open end portion of vacuum vessel with the output mirror glass substrate is achieved by hermetically adhering the output mirror glass substrate onto the metallic sealing ring via a low melting point solder glass interposed therebetween.