Abstract: To prevent plastic deformation of a bellows due to a pressure difference between inner and outer sides of the bellows in an outside gas type or inside gas type accumulator, a disc-like gasket is held in a float able state to a surface close to a stay in a bellows cap by a gasket holder, so that, the disc-like gasket moves together with the bellows cap at a steady operation time, the disc-like gasket moves together with the bellows cap to contact with an end surface portion of the stay, thereby closing the liquid chamber at a zero-down time, and the bellow cap moves toward a position where liquid pressure and gas pressure balance while the disc-like gasket keeps contacting with the stay due to a difference of pressure receiving areas in both the surfaces when the liquid in the liquid chamber is thermally expanded at a zero-down time.

Abstract: To prevent breakage by abnormal deformation when seal function of a seal section becomes ineffective to cause pressurized liquid remaining in the liquid chamber to be lost, a metallic bellows-type accumulator having a metal bellows, a bellows cap, an outer gas chamber and an inner liquid chamber, in a shell is structured to have a bellows constructed such that, when pressure in the liquid chamber (12) is further reduced after the bellows cap (31) is brought into contact with an oil port (4), surface contact sections (35) are formed on the metal bellows (3) and a curvature radius of U-shaped sections (3A) of crest portions (32) at the outer diameter side is reduced, and a curvature radius of U-shaped sections (3A) of root portions (33) at the inner diameter side is enlarged.

Abstract: To prevent breakage by abnormal deformation when seal function of a seal section becomes ineffective to cause pressurized liquid remaining in the liquid chamber to be lost, a metallic bellows-type accumulator having a metal bellows, a bellows cap, an outer gas chamber and an inner liquid chamber, in a shell is structured to have a bellows constructed such that, when pressure in the liquid chamber (12) is further reduced after the bellows cap (31) is brought into contact with an oil port (4), surface contact sections (35) are formed on the metal bellows (3) and a curvature radius of U-shaped sections (3A) of crest portions (32) at the outer diameter side is reduced, and a curvature radius of U-shaped sections (3A) of root portions (33) at the inner diameter side is enlarged.

Abstract: A sealing structure sealing a clearance between a base (1) having a storage part (11) and a cover (2) joined to the base (1) so as to close the storage part (11) through a gasket (4) formed of a rubber-like elastic material. The base (1) and the cover (2) comprise side peripheral surfaces (12a) and (22a) opposed to each other in a direction different from a joining direction with a screw member (3). The gasket (4) is integrally fitted onto the side peripheral surface (12a) of the base (1) (or the side peripheral surface (22a) of the cover (2)), and the seal surface (41a) of the gasket is closely fitted to the side peripheral surface (22a) of the cover (2) (or the side peripheral surface (12a) of the base (1)). Thus, the outer shell of a device formed of the base (1) and the cover (2) can be easily thinned and the cover (2) can be prevented from being nonuniformly deformed by the repulsion of the gasket (4).

Abstract: An organic substance analyzing system identifies and quantifies organic substances adhering to the surface of a sample placed in a chamber for a local organic substance analysis on the surface of the sample. The organic substance analyzing system heats a portion of the sample from the front side or the back side of the sample, collects gases discharged out of the portion of the surface and analyzes the collected gases. A lamp, a laser or an electron beam source is used as a heating means for locally heating a portion to be analyzed on the surface of the sample to locally discharge the gases out of the portion. Otherwise, the entire surface of the sample is heated, and the discharged gases are collected for every section so as to be analyzed.

Abstract: A gas sensor of the thermal conductivity type suitable for the quantitative analysis of the fuel vapor content of a fuel-air mixture. The gas sensor (10) comprises a sensing element (28) and a compensating element (30), each of which includes an electrically-heated hot member (38) incorporated into a Wheatstone bridge circuit powered by a constant current supply circuit (70). The constant current supply circuit (70) is adjusted and regulated such that the hot member (38) of the sensing element (28) is heated with an electric current of such an intensity that corresponds to a point of transition (Y) at which, at the interface of the hot member (38) and the mixture, the predominant mode of heat transfer changes from thermal conduction to natural convection.

Abstract: A gas sensor of the thermal conductivity type suitable for the quantitative analysis of the fuel vapor content of a fuel-air mixture. The gas sensor (10) comprises a sensing element (28) and a compensating element (30), each of which includes an electrically-heated hot member (38) incorporated into a Wheatstone bridge circuit powered by a constant current supply circuit (70). The constant current supply circuit (70) is adjusted and regulated such that the hot member (38) of the sensing element (28) is heated with an electric current of such an intensity that corresponds to a point of transition (Y) at which, at the interface of the hot member (38) and the mixture, the predominant mode of heat transfer changes from thermal conduction to natural convection.

Abstract: A semiconductor device manufacturing unit in which plasma gas is maintained sealed in a quartz tube by a magnet disposed outside the quartz tube to make the density of plasma gas high and uniform thereby improving the quality of CVD films deposited with the gas and reducing the processing time for semiconductor wafers. A wafer holder is movably mounted in the quartz tube. A support bar is provided for moving the wafer holder with the support bar serving additionally as a ground electrode. An RF electrode and magnet are disposed outside the quartz tube. A heater may be disposed outside the RF electrode and magnet.